/* ==========================================================================
   TEACHER SSONLINE - MODERN LUXURY GLASSMORPHISM DESIGN SYSTEM
   ========================================================================== */

:root {
  --font-khmer: 'Battambang', sans-serif;
  --font-khmer-title: 'Moul', cursive;
  --font-english: 'Outfit', 'Inter', sans-serif;

  /* Color Palette - Default High-End Midnight OLED (Full Night Mode) */
  --bg-dark: #030712;
  --bg-surface: #0a0f1d;
  --bg-card: rgba(13, 20, 36, 0.82);
  --bg-card-hover: rgba(20, 30, 56, 0.94);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);

  /* Primary Accents */
  --primary: #4f46e5;
  --primary-glow: rgba(79, 70, 229, 0.45);
  --primary-light: #818cf8;

  /* Accent Tones */
  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.45);
  --gold: #f59e0b;
  --gold-glow: rgba(245, 158, 11, 0.45);
  --gold-gradient: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
  --emerald: #10b981;
  --rose: #f43f5e;

  /* Text Colors */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Radius & Shadows */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-card: 0 12px 36px -8px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.28);
  --input-bg: rgba(11, 15, 25, 0.92);
}

/* ==========================================================================
   FULL NIGHT MODE (MIDNIGHT OLED - COMFORTABLE & VIBRANT AT NIGHT)
   ========================================================================== */
body.night-mode-full,
body.dark-theme {
  --bg-dark: #030712;
  --bg-surface: #070c18;
  --bg-card: rgba(11, 18, 33, 0.88);
  --bg-card-hover: rgba(18, 28, 52, 0.96);
  --border-glass: rgba(255, 255, 255, 0.09);
  --border-glow: rgba(99, 102, 241, 0.45);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --shadow-card: 0 16px 45px rgba(0, 0, 0, 0.88);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.4);
  --input-bg: rgba(8, 12, 22, 0.96);
  background-color: #030712;
  color: #f8fafc;
}

/* Day Mode (Clean & Crisp Light Theme) */
body.day-mode {
  --bg-dark: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-card-hover: rgba(241, 245, 249, 0.98);
  --border-glass: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(79, 70, 229, 0.3);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --shadow-card: 0 10px 25px rgba(0, 0, 0, 0.07);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.15);
  --input-bg: #ffffff;
  background-color: #f8fafc;
  color: #0f172a;
}

/* ==========================================================================
   1. APPLE iOS 18 & visionOS ULTRA-FROSTED GLASS THEME
   ========================================================================== */
body.theme-ios {
  --font-khmer: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Battambang', sans-serif;
  --font-english: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Outfit', sans-serif;
  --bg-dark: #000000;
  --bg-surface: #121214;
  --bg-card: rgba(28, 28, 30, 0.78);
  --bg-card-hover: rgba(44, 44, 46, 0.9);
  --border-glass: rgba(255, 255, 255, 0.16);
  --border-glow: rgba(0, 122, 255, 0.45);
  --primary: #007aff;
  --primary-glow: rgba(0, 122, 255, 0.5);
  --primary-light: #5ac8fa;
  --cyan: #32ade6;
  --cyan-glow: rgba(50, 173, 230, 0.45);
  --gold: #ff9f0a;
  --gold-glow: rgba(255, 159, 10, 0.45);
  --emerald: #34c759;
  --rose: #ff3b30;
  --text-main: #ffffff;
  --text-muted: #8e8e93;
  --text-dim: #636366;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-full: 9999px;
  --shadow-card: 0 14px 40px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 28px rgba(0, 122, 255, 0.35);
  --input-bg: rgba(28, 28, 30, 0.92);
  background-color: #000000;
  color: #ffffff;
}

body.theme-ios .glass-panel {
  background: rgba(28, 28, 30, 0.78);
  backdrop-filter: blur(35px) saturate(210%);
  -webkit-backdrop-filter: blur(35px) saturate(210%);
  border: 0.5px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.65), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

body.theme-ios .mobile-bottom-nav {
  background: rgba(22, 22, 24, 0.82);
  backdrop-filter: blur(40px) saturate(220%);
  -webkit-backdrop-filter: blur(40px) saturate(220%);
  border: 0.5px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.8), 0 0 20px rgba(0, 122, 255, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  border-radius: 32px;
}

body.theme-ios .m-ai-bubble {
  background: linear-gradient(135deg, #007aff 0%, #5856d6 50%, #af52de 100%);
  box-shadow: 0 8px 25px rgba(0, 122, 255, 0.7);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

body.theme-ios .btn-start-learning {
  background: linear-gradient(135deg, #007aff 0%, #5856d6 100%);
  border: 0.5px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 18px rgba(0, 122, 255, 0.5);
}

/* ==========================================================================
   2. GOOGLE ANDROID 15 MATERIAL YOU 3 EXPRESSIVE THEME
   ========================================================================== */
body.theme-android {
  --font-khmer: 'Google Sans', 'Roboto', 'Battambang', sans-serif;
  --font-english: 'Google Sans', 'Roboto', 'Inter', sans-serif;
  --bg-dark: #111318;
  --bg-surface: #191c20;
  --bg-card: rgba(29, 32, 36, 0.94);
  --bg-card-hover: rgba(39, 43, 49, 0.98);
  --border-glass: rgba(142, 145, 153, 0.22);
  --border-glow: rgba(168, 199, 250, 0.3);
  --primary: #a8c7fa;
  --primary-glow: rgba(168, 199, 250, 0.4);
  --primary-light: #d3e3fd;
  --cyan: #7fd5ff;
  --cyan-glow: rgba(127, 213, 255, 0.4);
  --gold: #fdd663;
  --gold-glow: rgba(253, 214, 99, 0.4);
  --emerald: #7adaa2;
  --rose: #f28b82;
  --text-main: #e2e2e9;
  --text-muted: #8e9099;
  --text-dim: #74777f;
  --radius-sm: 12px;
  --radius-md: 22px;
  --radius-lg: 30px;
  --radius-full: 9999px;
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(168, 199, 250, 0.22);
  --input-bg: #1d2024;
  background-color: #111318;
  color: #e2e2e9;
}

body.theme-android .glass-panel {
  background: #1d2024;
  border: 1px solid rgba(142, 145, 153, 0.22);
  border-radius: 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
}

body.theme-android .mobile-bottom-nav {
  background: #1e2025;
  border: 1px solid rgba(142, 145, 153, 0.22);
  border-radius: 28px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

body.theme-android .mobile-bottom-nav .m-nav-item.active {
  color: #a8c7fa;
}

body.theme-android .mobile-bottom-nav .m-nav-item.active::after {
  background: #a8c7fa;
  box-shadow: 0 0 8px #a8c7fa;
  width: 24px;
  height: 4px;
  border-radius: 8px;
}

body.theme-android .m-ai-bubble {
  background: linear-gradient(135deg, #1b72e8 0%, #8ab4f8 50%, #c58af9 100%);
  border: 2px solid #a8c7fa;
  box-shadow: 0 4px 18px rgba(168, 199, 250, 0.45);
}

body.theme-android .btn-start-learning {
  background: #a8c7fa;
  color: #042e6f;
  font-weight: 800;
  border: none;
  box-shadow: 0 4px 14px rgba(168, 199, 250, 0.35);
}

body.theme-android .btn-start-learning:hover {
  background: #d3e3fd;
  color: #042e6f;
}

/* ==========================================================================
   3. LUXURY ROYAL GOLD VIP THEME
   ========================================================================== */
body.theme-luxury-gold {
  --bg-dark: #08080a;
  --bg-surface: #101014;
  --bg-card: rgba(18, 18, 22, 0.88);
  --bg-card-hover: rgba(28, 28, 34, 0.95);
  --border-glass: rgba(245, 158, 11, 0.25);
  --border-glow: rgba(245, 158, 11, 0.5);
  --primary: #f59e0b;
  --primary-glow: rgba(245, 158, 11, 0.55);
  --primary-light: #fde68a;
  --cyan: #38bdf8;
  --cyan-glow: rgba(56, 189, 248, 0.45);
  --gold: #fbbf24;
  --gold-glow: rgba(251, 191, 36, 0.6);
  --emerald: #10b981;
  --rose: #f43f5e;
  --text-main: #fef3c7;
  --text-muted: #d4d4d8;
  --text-dim: #71717a;
  --shadow-card: 0 16px 45px rgba(0, 0, 0, 0.88);
  --shadow-glow: 0 0 30px rgba(245, 158, 11, 0.35);
  --input-bg: #121216;
  background-color: #08080a;
  color: #fef3c7;
}

body.theme-luxury-gold .glass-panel {
  border: 1px solid rgba(245, 158, 11, 0.3);
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.75), 0 0 20px rgba(245, 158, 11, 0.15);
}

body.theme-luxury-gold .mobile-bottom-nav {
  background: rgba(14, 14, 18, 0.88);
  border: 1px solid rgba(245, 158, 11, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.75), 0 0 25px rgba(245, 158, 11, 0.22);
}

body.theme-luxury-gold .m-ai-bubble {
  background: linear-gradient(135deg, #d97706 0%, #fbbf24 50%, #b45309 100%);
  border: 2px solid #fef3c7;
  box-shadow: 0 6px 22px rgba(245, 158, 11, 0.7);
}

body.theme-luxury-gold .btn-start-learning {
  background: linear-gradient(135deg, #d97706 0%, #f59e0b 50%, #b45309 100%);
  color: #000000;
  font-weight: 800;
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.6);
}

/* ==========================================================================
   4. MATRIX CYBER NEON THEME
   ========================================================================== */
body.theme-matrix-neon {
  --bg-dark: #040806;
  --bg-surface: #08110d;
  --bg-card: rgba(10, 20, 16, 0.88);
  --bg-card-hover: rgba(16, 32, 25, 0.95);
  --border-glass: rgba(16, 185, 129, 0.28);
  --border-glow: rgba(16, 185, 129, 0.55);
  --primary: #10b981;
  --primary-glow: rgba(16, 185, 129, 0.6);
  --primary-light: #6ee7b7;
  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.45);
  --gold: #f59e0b;
  --emerald: #00ff88;
  --text-main: #ecfdf5;
  --text-muted: #a7f3d0;
  --text-dim: #6ee7b7;
  --shadow-card: 0 16px 45px rgba(0, 0, 0, 0.88);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.35);
  --input-bg: #09140f;
  background-color: #040806;
  color: #ecfdf5;
}

body.theme-matrix-neon .glass-panel {
  border: 1px solid rgba(16, 185, 129, 0.35);
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.8), 0 0 25px rgba(16, 185, 129, 0.2);
}

body.theme-matrix-neon .mobile-bottom-nav {
  background: rgba(6, 15, 11, 0.88);
  border: 1px solid rgba(16, 185, 129, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8), 0 0 25px rgba(16, 185, 129, 0.3);
}

body.theme-matrix-neon .m-ai-bubble {
  background: linear-gradient(135deg, #059669 0%, #10b981 50%, #00ff88 100%);
  border: 2px solid #ecfdf5;
  box-shadow: 0 6px 22px rgba(16, 185, 129, 0.8);
}

body.theme-matrix-neon .btn-start-learning {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  color: #022c22;
  font-weight: 800;
  box-shadow: 0 4px 18px rgba(16, 185, 129, 0.6);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Custom Sleek Scrollbar for Full Night Mode */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.35);
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(6, 182, 212, 0.6);
}

body {
  font-family: var(--font-khmer);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Ambient Background Glows */
.ambient-glow {
  position: fixed;
  width: 650px;
  height: 650px;
  border-radius: 50%;
  filter: blur(150px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
}
.top-glow {
  top: -220px;
  right: -100px;
  background: radial-gradient(circle, #6366f1 0%, transparent 70%);
}
.bottom-glow {
  bottom: -220px;
  left: -100px;
  background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
}

.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-card);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.app-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   NAVIGATION BAR
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.logo-badge {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-english);
  font-weight: 900;
  font-size: 18px;
  color: #fff;
  box-shadow: 0 0 15px rgba(79, 70, 229, 0.4);
}

.logo-badge.school-logo-container {
  background: transparent;
  box-shadow: none;
}

.brand-logo-img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: contain;
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.4);
  border: 2px solid rgba(251, 191, 36, 0.5);
  background: #fff;
  transition: transform 0.3s ease;
}

.nav-brand:hover .brand-logo-img {
  transform: scale(1.08) rotate(3deg);
}

.brand-title {
  font-family: var(--font-english);
  font-weight: 800;
  font-size: 17px;
  color: #fff;
  letter-spacing: -0.3px;
}

.brand-sub {
  font-size: 11px;
  color: var(--cyan);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.nav-item:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
  color: #fff;
  background: rgba(79, 70, 229, 0.15);
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: 0 0 12px rgba(79, 70, 229, 0.2);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Theme Toggle Switcher Button (Night Mode Full) */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #f1f5f9;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-english, sans-serif);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  backdrop-filter: blur(8px);
}

.theme-toggle-btn:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: #6366f1;
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.theme-toggle-btn:active {
  transform: scale(0.96);
}

.theme-toggle-btn .theme-icon {
  font-size: 14px;
}

.theme-toggle-btn .theme-label {
  font-size: 12px;
  letter-spacing: 0.3px;
}

body.day-mode .theme-toggle-btn {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.12);
  color: #0f172a;
}
body.day-mode .theme-toggle-btn:hover {
  background: rgba(79, 70, 229, 0.12);
  border-color: #4f46e5;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  cursor: pointer;
  transition: all 0.25s ease;
}

.user-badge:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-glow);
}

.avatar-ring {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #000;
  font-size: 14px;
}

.user-name {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  max-width: 120px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-tier-badge {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
  display: inline-block;
}
.user-tier-badge.free {
  background: rgba(148, 163, 184, 0.2);
  color: #94a3b8;
}
.user-tier-badge.vip {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
}

/* ==========================================================================
   BUTTONS & CONTROLS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-khmer);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12.5px;
  border-radius: var(--radius-sm);
}

.btn-xs {
  padding: 4px 8px;
  font-size: 11px;
  border-radius: 6px;
}

.btn-lg {
  padding: 13px 26px;
  font-size: 15px;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  color: #fff;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.35);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #4338ca 0%, #2563eb 100%);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5);
  transform: translateY(-1px);
}

.btn-gold {
  background: var(--gold-gradient);
  color: #111827;
  font-weight: 800;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.35);
}
.btn-gold:hover {
  box-shadow: 0 6px 22px rgba(245, 158, 11, 0.5);
  transform: translateY(-1px);
}

.btn-cyan {
  background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
  color: #fff;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
}
.btn-cyan:hover {
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
  transform: translateY(-1px);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 1px solid var(--border-glass);
}
.btn-glass:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-glass);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-glow);
}

.btn-outline-gold {
  background: transparent;
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}
.btn-outline-gold:hover {
  background: rgba(245, 158, 11, 0.1);
  border-color: #fbbf24;
}

.btn-danger {
  background: rgba(244, 63, 94, 0.15);
  color: #f43f5e;
  border: 1px solid rgba(244, 63, 94, 0.3);
}
.btn-danger:hover {
  background: #f43f5e;
  color: #fff;
}

.btn-google {
  background: #ffffff !important;
  color: #1f2937 !important;
  font-weight: 700 !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.btn-google:hover {
  background: #f8fafc !important;
  color: #0f172a !important;
  border-color: #cbd5e1 !important;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.22) !important;
  transform: translateY(-1px);
}
.google-icon-svg {
  width: 22px;
  height: 22px;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}
.google-auth-btn-wrap {
  margin-bottom: 16px;
}
.device-item-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
}
.device-item-card.current {
  border-color: rgba(6, 182, 212, 0.4);
  background: rgba(6, 182, 212, 0.08);
}
.device-info-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.device-name-title {
  font-size: 13px;
  font-weight: 700;
  color: #f1f5f9;
}
.device-meta-sub {
  font-size: 11px;
  color: #94a3b8;
}
.device-current-tag {
  display: inline-block;
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 6px;
}

/* ==========================================================================
   MAIN CONTENT & TABS
   ========================================================================== */

.main-content {
  flex: 1;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 20px 80px 20px;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.35s ease;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-title {
  margin-bottom: 24px;
}

.section-title h2 {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
}

.section-title p {
  font-size: 13.5px;
  color: var(--text-muted);
}

/* ==========================================================================
   HERO CARD & DASHBOARD
   ========================================================================== */

.hero-card {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 30px;
  padding: 36px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(30, 41, 69, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6);
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #c7d2fe;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 16px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.hero-title {
  font-size: 30px;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 14px;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-art {
  display: flex;
  align-items: center;
  justify-content: center;
}

.art-card {
  padding: 30px 24px;
  border-radius: var(--radius-lg);
  text-align: center;
  width: 100%;
  max-width: 320px;
  border: 1px solid rgba(251, 191, 36, 0.3);
  position: relative;
  background: rgba(22, 32, 54, 0.85);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.art-logo-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 12px;
}

.hero-school-logo {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: contain;
  box-shadow: 0 0 24px rgba(6, 182, 212, 0.45);
  border: 3px solid rgba(251, 191, 36, 0.6);
  background: #fff;
  transition: transform 0.4s ease;
}

.hero-school-logo:hover {
  transform: scale(1.08) rotate(5deg);
}

.art-icon {
  font-size: 42px;
  margin-bottom: 10px;
}

.art-title {
  font-size: 15px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 2px;
}

.art-sub {
  font-family: var(--font-english);
  font-size: 12px;
  color: var(--cyan);
  margin-bottom: 12px;
}

.art-director {
  font-size: 12px;
  color: #cbd5e1;
  margin-bottom: 16px;
}

.art-seal {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: var(--gold-gradient);
  color: #000;
  font-weight: 900;
  font-size: 11px;
  letter-spacing: 1px;
}

/* Sync Notice Banner */
.sync-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border-left: 4px solid var(--cyan);
}

.sync-icon {
  font-size: 28px;
}

.sync-text {
  flex: 1;
}

.sync-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

.sync-sub {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.stat-card {
  padding: 20px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
}

.stat-icon {
  font-size: 18px;
}

.stat-val {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 4px;
}

.stat-sub {
  font-size: 11.5px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  margin-top: auto;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, #4f46e5, #06b6d4);
  transition: width 0.5s ease;
}

.progress-fill.fill-gold {
  background: var(--gold-gradient);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.feature-card {
  padding: 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.f-icon {
  font-size: 32px;
  margin-bottom: 14px;
}

.f-title {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.f-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.f-action {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--cyan);
}

/* ==========================================================================
   CURRICULUM VIEW
   ========================================================================== */

.months-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: 20px;
  scrollbar-width: thin;
}

.month-tab-pill {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s ease;
}

.month-tab-pill:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.month-tab-pill.active {
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.weeks-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.week-card {
  padding: 20px;
  border-radius: var(--radius-md);
}

.week-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-glass);
}

.week-title {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.lesson-item-card {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  transition: all 0.2s ease;
}

.lesson-item-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateX(3px);
}

.lesson-item-card.completed {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.05);
}

.l-info {
  display: flex;
  flex-direction: column;
}

.l-title {
  font-size: 13.5px;
  font-weight: 700;
  color: #fff;
}

.l-status {
  font-size: 11px;
  color: var(--text-dim);
}

.lesson-item-card.completed .l-status {
  color: var(--emerald);
  font-weight: 700;
}

/* ==========================================================================
   LESSON DETAIL & STUDY LAYOUT
   ========================================================================== */

/* Mobile-First Top Header Navigation */
.lesson-mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  width: 100%;
}

.btn-lesson-back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e2e8f0;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  font-family: var(--font-khmer, sans-serif);
}

.btn-lesson-back:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.4);
  color: #fff;
}

.btn-lesson-back .back-arrow {
  font-size: 17px;
  line-height: 1;
  font-weight: 700;
  color: #38bdf8;
}

.lesson-header-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 5px 12px;
  border-radius: 20px;
  max-width: 170px;
  overflow: hidden;
}

.pill-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  flex-shrink: 0;
}

.pill-lesson-name {
  font-size: 12px;
  font-weight: 700;
  color: #f1f5f9;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--font-khmer, sans-serif);
}

.lesson-nav-arrow-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-lesson-nav-arrow {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-lesson-nav-arrow:hover:not(:disabled) {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.5);
  color: #fff;
  transform: scale(1.05);
}

.btn-lesson-nav-arrow.next {
  background: rgba(37, 99, 235, 0.25);
  border-color: rgba(59, 130, 246, 0.4);
  color: #60a5fa;
}

.btn-lesson-nav-arrow:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

.lesson-breadcrumbs {
  font-size: 11px;
  color: #94a3b8;
  padding: 4px 6px 12px 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

/* Single-Column Full Width Mobile Layout */
.lesson-layout {
  display: flex !important;
  flex-direction: column !important;
  width: 100% !important;
  gap: 16px !important;
  box-sizing: border-box !important;
}

.lesson-card {
  width: 100% !important;
  padding: 16px 14px !important;
  border-radius: 20px !important;
  display: flex !important;
  flex-direction: column !important;
  box-sizing: border-box !important;
  overflow: hidden !important;
}

.lesson-meta-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 16px;
}

.lesson-title {
  font-size: 19px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.35;
  word-break: break-word;
}

.lesson-badges {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.audio-player-box {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(30, 41, 69, 0.7), rgba(15, 23, 42, 0.85));
  border: 1px solid rgba(6, 182, 212, 0.35);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.audio-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.audio-icon-pulse {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.audio-text {
  min-width: 0;
  flex: 1;
}

.audio-title {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.audio-sub {
  font-size: 11px;
  color: #94a3b8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.audio-controls {
  flex-shrink: 0;
}

#playAudioBtn {
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 12.5px;
  font-weight: 700;
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  border: none;
  color: #fff;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.2s ease;
}

#playAudioBtn:hover {
  transform: scale(1.03);
}

.lesson-content-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: #e2e8f0;
  margin-bottom: 24px;
  padding: 14px 12px;
  background: rgba(11, 15, 25, 0.65);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  width: 100%;
  box-sizing: border-box;
}

/* ==========================================================================
   PROFESSIONAL UNIFIED LESSON DESIGN SYSTEM (WORLD-CLASS EDUCATIONAL UX/UI)
   ========================================================================== */

.pro-lesson-container {
  display: flex;
  flex-direction: column;
  gap: 22px;
  width: 100%;
  box-sizing: border-box;
}

/* --------------------------------------------------------------------------
   1. ACADEMY HERO BANNER
   -------------------------------------------------------------------------- */
.pro-academy-banner {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 22px;
  border-radius: 18px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pro-academy-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #6366f1, #38bdf8, #10b981);
}

/* Course Theme Variants */
.pro-academy-banner.badge-beginner {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.16), rgba(139, 92, 246, 0.12));
  border: 1px solid rgba(236, 72, 153, 0.35);
}
.pro-academy-banner.badge-beginner::before {
  background: linear-gradient(90deg, #ec4899, #a855f7, #f43f5e);
}

.pro-academy-banner.badge-elementary {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.16), rgba(6, 182, 212, 0.12));
  border: 1px solid rgba(16, 185, 129, 0.35);
}
.pro-academy-banner.badge-elementary::before {
  background: linear-gradient(90deg, #10b981, #06b6d4, #3b82f6);
}

.pro-academy-banner.badge-general {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.18), rgba(56, 189, 248, 0.14));
  border: 1px solid rgba(99, 102, 241, 0.35);
}
.pro-academy-banner.badge-general::before {
  background: linear-gradient(90deg, #6366f1, #38bdf8, #8b5cf6);
}

.pro-banner-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.pro-brand-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 13.5px;
  color: #e2e8f0;
  letter-spacing: 0.2px;
}

.pro-brand-icon {
  font-size: 17px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.pro-level-badge {
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  letter-spacing: 0.3px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.pro-topic-hero {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.pro-topic-title-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.pro-topic-icon {
  font-size: 22px;
  margin-top: 2px;
  flex-shrink: 0;
}

.pro-topic-title {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.45;
  color: #ffffff;
  margin: 0;
  background: linear-gradient(135deg, #ffffff, #e2e8f0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.pro-context-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: #94a3b8;
  padding-left: 32px;
}

.pro-banner-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.pro-tutor-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 9999px;
  backdrop-filter: blur(8px);
}

.pro-tutor-pill.tutor-piseth {
  background: rgba(236, 72, 153, 0.2);
  border: 1px solid rgba(236, 72, 153, 0.45);
  color: #f472b6;
}

.pro-tutor-pill.tutor-sorn {
  background: rgba(14, 165, 233, 0.2);
  border: 1px solid rgba(14, 165, 233, 0.45);
  color: #38bdf8;
}

.pro-banner-quick-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pro-quick-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 12.5px;
  font-weight: 700;
  border-radius: 9999px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #f1f5f9;
  transition: all 0.2s ease;
}

.pro-quick-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
  color: #fff;
}

.pro-quick-btn.gold {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.25), rgba(217, 119, 6, 0.25));
  border-color: rgba(245, 158, 11, 0.45);
  color: #fbbf24;
}

.pro-quick-btn.gold:hover {
  background: #f59e0b;
  color: #0f172a;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.4);
}

/* --------------------------------------------------------------------------
   2. SECTION BLOCKS & TITLES
   -------------------------------------------------------------------------- */
.pro-section-block {
  padding: 20px 22px;
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-left: 4px solid #6366f1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color 0.2s ease;
}

.pro-section-block:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.pro-section-block.pro-phonics-block { border-left-color: #ec4899; }
.pro-section-block.pro-grammar-block { border-left-color: #6366f1; }
.pro-section-block.pro-vocab-block { border-left-color: #10b981; }
.pro-section-block.pro-sentences-block { border-left-color: #38bdf8; }
.pro-section-block.pro-dialogue-block { border-left-color: #a855f7; }
.pro-section-block.pro-mistakes-block { border-left-color: #ef4444; }
.pro-section-block.pro-tutor-tip-block { border-left-color: #f59e0b; }
.pro-section-block.pro-practice-block { border-left-color: #fbbf24; }

.pro-section-title {
  font-size: 16.5px;
  font-weight: 800;
  color: #38bdf8;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  letter-spacing: 0.1px;
}

.pro-sec-icon {
  font-size: 20px;
}

/* --------------------------------------------------------------------------
   3. PHONICS & ALPHABET MODULE
   -------------------------------------------------------------------------- */
.pro-phonics-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px;
  background: rgba(30, 41, 59, 0.45);
  border: 1px solid rgba(236, 72, 153, 0.25);
  border-radius: 14px;
}

.pro-phonics-hero-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.pro-phonics-letter-hero {
  min-width: 110px;
  padding: 14px 18px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.25), rgba(139, 92, 246, 0.25));
  border: 1.5px solid rgba(236, 72, 153, 0.45);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 18px rgba(236, 72, 153, 0.25);
}

.phonics-giant-letter {
  font-size: 38px;
  font-weight: 900;
  background: linear-gradient(135deg, #f472b6, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.phonics-letter-desc {
  font-size: 13px;
  font-weight: 700;
  color: #e2e8f0;
  margin-top: 4px;
}

.pro-phonics-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.pro-phonics-sound-box, .pro-phonics-spelling-box {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.phonics-tag {
  font-size: 11.5px;
  font-weight: 700;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.phonics-ipa-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.phonics-ipa-text {
  font-size: 17px;
  font-weight: 800;
  color: #38bdf8;
  font-family: monospace, sans-serif;
  padding: 4px 12px;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(14, 165, 233, 0.3);
  border-radius: 8px;
}

.phonics-tokens-rail {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.spelling-token-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #f8fafc;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.spelling-token-btn:hover {
  background: #ec4899;
  border-color: #f472b6;
  color: #fff;
  transform: translateY(-2px) scale(1.08);
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.4);
}

.token-letter {
  font-size: 15px;
  font-weight: 800;
}

.token-sound {
  font-size: 11px;
  opacity: 0.7;
}

.pro-phonics-note-banner {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.25);
  font-size: 13.5px;
  color: #fef3c7;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   4. GRAMMAR, FORMULAS & DEFINITIONS
   -------------------------------------------------------------------------- */
.pro-definition-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pro-def-paragraph {
  font-size: 15px;
  line-height: 1.8;
  color: #e2e8f0;
  margin: 0;
}

.pro-formula-box {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.85));
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.3);
}

.formula-badge-label {
  font-size: 11.5px;
  font-weight: 800;
  color: #818cf8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.formula-code {
  font-family: 'Fira Code', monospace, sans-serif;
  font-size: 15px;
  font-weight: 700;
  color: #38bdf8;
  line-height: 1.7;
  white-space: pre-wrap;
}

.pro-rules-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pro-rule-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 14.5px;
  color: #f1f5f9;
}

.pro-rule-item.bilingual {
  justify-content: space-between;
  flex-wrap: wrap;
}

.rule-en-side {
  display: flex;
  align-items: center;
  gap: 8px;
}

.rule-bullet {
  color: #818cf8;
  font-size: 11px;
}

.rule-en-key {
  font-weight: 700;
  color: #fff;
  font-size: 14.5px;
}

.rule-kh-side {
  display: flex;
  align-items: center;
  gap: 8px;
}

.rule-arrow {
  color: #64748b;
  font-size: 12px;
}

.rule-kh-val {
  color: #38bdf8;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   5. BILINGUAL VOCABULARY & SENTENCE CARDS
   -------------------------------------------------------------------------- */
.pro-bilingual-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pro-bilingual-card {
  padding: 14px 18px;
  border-radius: 14px;
  background: rgba(30, 41, 59, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.pro-bilingual-card:hover {
  background: rgba(30, 41, 59, 0.85);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.pro-sentence-card {
  border-left: 3px solid #38bdf8;
}

.pro-sentence-header-tag {
  font-size: 12.5px;
  font-weight: 800;
  color: #a78bfa;
  margin-bottom: 2px;
  letter-spacing: 0.2px;
}

.pro-en-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.pro-en-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.pro-en-word-box {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.pro-en-text {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.2px;
  line-height: 1.5;
}

/* Clickable English Words & Sentences */
.clickable-speak {
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  border-radius: 4px;
}

.clickable-speak:hover {
  color: #38bdf8 !important;
  text-decoration: underline dotted #38bdf8;
  text-underline-offset: 4px;
  background: rgba(56, 189, 248, 0.08);
}

.clickable-speak:active {
  transform: scale(0.98);
}

/* Floating Selection Pronunciation Tooltip */
.pro-selection-tts-tooltip {
  position: absolute;
  z-index: 99999;
  transform: translateX(-50%);
  animation: selTTSFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
}

.pro-selection-tts-tooltip.hidden {
  display: none !important;
}

.pro-sel-tts-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(56, 189, 248, 0.4);
  border-radius: 30px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.pro-sel-tts-btn:hover {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 12px 28px rgba(14, 165, 233, 0.45);
}

.pro-sel-tts-btn:active {
  transform: translateY(0) scale(0.96);
}

@keyframes selTTSFadeIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(6px) scale(0.92);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }
}

.pro-ipa-pill {
  font-size: 12px;
  font-weight: 600;
  color: #38bdf8;
  font-family: monospace, sans-serif;
  padding: 2px 8px;
  background: rgba(14, 165, 233, 0.14);
  border-radius: 6px;
  border: 1px solid rgba(14, 165, 233, 0.25);
}

.pro-kh-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 50px;
}

.pro-flag {
  font-size: 15px;
  flex-shrink: 0;
}

.pro-kh-text {
  font-size: 14.5px;
  color: #38bdf8;
  font-weight: 600;
  line-height: 1.6;
}

.pro-word-logo-badge {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 21px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid rgba(168, 85, 247, 0.35);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease;
  user-select: none;
  flex-shrink: 0;
}

.pro-bilingual-card:hover .pro-word-logo-badge {
  transform: scale(1.15) rotate(-4deg);
  border-color: rgba(99, 102, 241, 0.6);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.pro-word-logo-badge .letter-monogram {
  font-weight: 900;
  font-size: 18px;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Sub-Example Drawer in Vocabulary */
.pro-vocab-sub-example {
  margin-top: 4px;
  margin-left: 50px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sub-ex-en-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: #e2e8f0;
}

.sub-ex-label {
  font-weight: 700;
  color: #a78bfa;
}

.sub-ex-en-text {
  font-weight: 600;
  color: #fff;
  flex: 1;
}

.sub-ex-kh-row {
  font-size: 13px;
  color: #38bdf8;
  padding-left: 6px;
}

/* --------------------------------------------------------------------------
   6. SPEAK BUTTON (AUDIO)
   -------------------------------------------------------------------------- */
.pro-speak-btn {
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: #818cf8;
  width: 34px;
  height: 34px;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  flex-shrink: 0;
}

.pro-speak-btn.sm {
  width: 26px;
  height: 26px;
  font-size: 11px;
}

.pro-speak-btn:hover {
  background: #6366f1;
  color: #fff;
  transform: scale(1.12);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.6);
}

.pro-speak-btn.playing {
  background: #6366f1 !important;
  color: #fff !important;
  transform: scale(1.18);
  box-shadow: 0 0 14px rgba(99, 102, 241, 0.8) !important;
  animation: speakPulse 0.8s ease-in-out infinite alternate;
}

@keyframes speakPulse {
  0% { transform: scale(1.08); }
  100% { transform: scale(1.22); }
}

/* --------------------------------------------------------------------------
   7. BILINGUAL DIALOGUES
   -------------------------------------------------------------------------- */
.pro-dialogue-thread {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 6px 0;
}

.pro-dialogue-turn {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 88%;
}

.pro-dialogue-turn.speaker-b {
  align-self: flex-end;
}

.pro-speaker-name {
  font-size: 12.5px;
  font-weight: 700;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pro-speaker-avatar {
  font-size: 16px;
}

.pro-dialogue-turn.speaker-b .pro-speaker-name {
  justify-content: flex-end;
}

.pro-dialogue-bubble {
  padding: 14px 18px;
  border-radius: 16px;
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.pro-dialogue-turn.speaker-a .pro-dialogue-bubble {
  border-left: 3.5px solid #6366f1;
  border-bottom-left-radius: 4px;
}

.pro-dialogue-turn.speaker-b .pro-dialogue-bubble {
  border-right: 3.5px solid #10b981;
  border-bottom-right-radius: 4px;
  background: rgba(16, 185, 129, 0.09);
}

/* --------------------------------------------------------------------------
   8. COMMON MISTAKES
   -------------------------------------------------------------------------- */
.pro-mistakes-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pro-mistake-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 14.5px;
}

.pro-mistake-row.wrong {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.pro-mistake-row.correct {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

.mistake-badge {
  font-size: 12px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 9999px;
  flex-shrink: 0;
}

.mistake-badge.wrong {
  background: rgba(239, 68, 68, 0.25);
  color: #f87171;
}

.mistake-badge.correct {
  background: rgba(16, 185, 129, 0.25);
  color: #34d399;
}

.mistake-text {
  font-weight: 600;
  line-height: 1.5;
}

.pro-mistake-note {
  font-size: 13.5px;
  color: #cbd5e1;
  padding: 4px 8px;
}

/* --------------------------------------------------------------------------
   9. AI TUTOR PRO TIPS
   -------------------------------------------------------------------------- */
.pro-tutor-tip-card {
  padding: 18px 22px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.14), rgba(217, 119, 6, 0.08));
  border: 1px solid rgba(245, 158, 11, 0.35);
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.12);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tutor-tip-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tutor-tip-badge-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tutor-tip-badge {
  font-size: 11px;
  font-weight: 800;
  color: #fbbf24;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}

.tutor-tip-title {
  font-size: 16px;
  font-weight: 800;
  color: #fef08a;
  margin: 0;
}

.tutor-tip-body {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.tutor-tip-avatar {
  font-size: 28px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(245, 158, 11, 0.4));
}

.tutor-tip-content {
  font-size: 14.5px;
  color: #f8fafc;
  line-height: 1.8;
  white-space: pre-wrap;
}

/* --------------------------------------------------------------------------
   10. PRACTICE EXERCISE
   -------------------------------------------------------------------------- */
.pro-practice-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 22px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(168, 85, 247, 0.08));
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.pro-practice-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pro-practice-icon {
  font-size: 20px;
}

.pro-practice-title {
  font-size: 16px;
  font-weight: 800;
  color: #a5b4fc;
}

.pro-practice-content {
  font-size: 15px;
  color: #f1f5f9;
  line-height: 1.8;
  white-space: pre-wrap;
}

.pro-practice-action-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.pro-practice-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 9999px;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
}

.pro-practice-btn.primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.pro-practice-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.5);
}

.pro-practice-btn.gold {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #0f172a;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.pro-practice-btn.gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(245, 158, 11, 0.5);
}

.pro-generic-content {
  font-size: 15px;
  line-height: 1.8;
  color: #e2e8f0;
  white-space: pre-wrap;
}

/* --------------------------------------------------------------------------
   11. LIGHT / DAY MODE COMPATIBILITY
   -------------------------------------------------------------------------- */
body.day-mode .pro-academy-banner {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

body.day-mode .pro-topic-title {
  color: #0f172a;
  background: none;
  -webkit-text-fill-color: initial;
}

body.day-mode .pro-brand-left {
  color: #334155;
}

body.day-mode .pro-level-badge {
  background: rgba(0, 0, 0, 0.06);
  border-color: rgba(0, 0, 0, 0.1);
  color: #0f172a;
}

body.day-mode .pro-section-block {
  background: #ffffff;
  border-color: #e2e8f0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

body.day-mode .pro-section-title {
  color: #1e293b;
}

body.day-mode .pro-def-paragraph,
body.day-mode .pro-en-text,
body.day-mode .pro-generic-content,
body.day-mode .pro-practice-content {
  color: #1e293b;
}

body.day-mode .pro-bilingual-card {
  background: #f8fafc;
  border-color: #e2e8f0;
}

body.day-mode .pro-bilingual-card:hover {
  background: #ffffff;
  border-color: #6366f1;
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.15);
}

body.day-mode .pro-rule-item {
  background: #f8fafc;
  border-color: #e2e8f0;
  color: #1e293b;
}

body.day-mode .rule-en-key {
  color: #0f172a;
}

body.day-mode .pro-phonics-card {
  background: #fdf2f8;
  border-color: #fbcfe8;
}

body.day-mode .pro-phonics-letter-hero {
  background: linear-gradient(135deg, #fce7f3, #fae8ff);
  border-color: #f472b6;
}

body.day-mode .phonics-letter-desc {
  color: #475569;
}

body.day-mode .spelling-token-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.day-mode .pro-dialogue-bubble {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

body.day-mode .pro-dialogue-turn.speaker-b .pro-dialogue-bubble {
  background: #ecfdf5;
}

body.day-mode .tutor-tip-content {
  color: #451a03;
}

body.day-mode .tutor-tip-title {
  color: #78350f;
}

/* --------------------------------------------------------------------------
   12. MOBILE RESPONSIVENESS
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .pro-academy-banner {
    padding: 16px;
    gap: 12px;
  }

  .pro-topic-title {
    font-size: 17.5px;
  }

  .pro-context-row {
    padding-left: 0;
  }

  .pro-section-block {
    padding: 16px;
  }

  .pro-bilingual-card {
    padding: 12px 14px;
  }

  .pro-kh-row {
    padding-left: 0;
  }

  .pro-vocab-sub-example {
    margin-left: 0;
  }

  .pro-dialogue-turn {
    max-width: 95%;
  }

  .pro-practice-btn {
    width: 100%;
    justify-content: center;
  }
}

.lesson-actions-bar {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  box-sizing: border-box;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.btn-action-quiz {
  width: 100%;
  padding: 13px 18px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 800;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  border: none;
  color: #fff;
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.35);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-khmer, sans-serif);
}

.btn-action-quiz:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(245, 158, 11, 0.5);
}

.lesson-actions-nav-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  width: 100%;
}

.lesson-actions-nav-row .btn {
  width: 100%;
  padding: 11px 8px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  white-space: nowrap;
}

/* AI Tutor Assistant Card (Bottom of Lesson View) */
.ai-tutor-card {
  width: 100% !important;
  box-sizing: border-box !important;
  padding: 16px 14px !important;
  border-radius: 20px !important;
  display: flex !important;
  flex-direction: column !important;
  height: 480px !important;
  max-height: 70vh !important;
  background: rgba(15, 23, 42, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4) !important;
}

.ai-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 12px;
}

.ai-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.ai-name {
  font-size: 14px;
  font-weight: 800;
  color: #fff;
}

.ai-status {
  font-size: 11px;
  color: var(--emerald);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
  margin-bottom: 10px;
  scrollbar-width: thin;
}

.chat-bubble {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 13.5px;
  line-height: 1.6;
  word-break: break-word;
}

.chat-bubble.ai {
  background: rgba(30, 41, 69, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #f1f5f9;
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chat-bubble.user {
  background: linear-gradient(135deg, #4f46e5, #3b82f6);
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.quick-prompts {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: 10px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.quick-prompts::-webkit-scrollbar {
  display: none;
}

.pill-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #cbd5e1;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
  font-family: var(--font-khmer, sans-serif);
}

.pill-btn:hover {
  color: #fff;
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.4);
}

.chat-input-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.chat-input-bar input {
  flex: 1;
  padding: 10px 14px;
  border-radius: 20px;
  background: rgba(11, 15, 25, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  font-family: var(--font-khmer);
  font-size: 13px;
  outline: none;
}

.chat-input-bar input:focus {
  border-color: var(--primary-light);
}

.btn-icon {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: #fff;
  padding: 0 14px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-icon.recording {
  background: #ef4444;
  border-color: #ef4444;
  animation: pulse-record 1.5s infinite;
}

@keyframes pulse-record {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.tts-btn {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  margin-left: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  vertical-align: middle;
  transition: all 0.2s;
}

.tts-btn:hover { 
  background: rgba(255,255,255,0.3); 
  transform: scale(1.1);
}

.tts-btn.playing {
  background: var(--primary);
  border-color: var(--primary-light);
}

/* ==========================================================================
   QUIZ ENGINE
   ========================================================================== */

.quiz-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 30px;
  border-radius: var(--radius-lg);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-glass);
}

.quiz-badge {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
  font-weight: 800;
  letter-spacing: 0.5px;
}

.quiz-main-title {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  margin-top: 4px;
}

.quiz-progress-text {
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
}

.quiz-pills-bar {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 14px;
  margin-bottom: 24px;
  scrollbar-width: thin;
}

.q-pill {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
}

.q-pill.active {
  border-color: var(--cyan);
  color: #fff;
  background: rgba(6, 182, 212, 0.2);
}

.q-pill.answered {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--emerald);
  color: #34d399;
}

.quiz-question-box {
  margin-bottom: 30px;
}

.question-number {
  font-size: 13px;
  font-weight: 800;
  color: var(--gold);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.question-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  line-height: 1.6;
  margin-bottom: 24px;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.quiz-option-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(99, 102, 241, 0.4);
}

.quiz-option-btn.selected {
  background: rgba(79, 70, 229, 0.2);
  border-color: var(--primary-light);
  color: #fff;
  box-shadow: 0 0 15px rgba(79, 70, 229, 0.25);
}

.opt-key {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: #94a3b8;
  flex-shrink: 0;
}

.quiz-option-btn.selected .opt-key {
  background: var(--primary);
  color: #fff;
}

.quiz-nav-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-glass);
}

/* ==========================================================================
   ANNUAL EXAMS & CERTIFICATES LIST
   ========================================================================== */

.annual-notice {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border: 1px solid rgba(245, 158, 11, 0.3);
  background: rgba(245, 158, 11, 0.05);
}

.annual-notice .notice-icon {
  font-size: 32px;
}

.annual-notice h3 {
  font-size: 15px;
  font-weight: 800;
  color: #fbbf24;
  margin-bottom: 6px;
}

.annual-notice p {
  font-size: 13px;
  color: #cbd5e1;
  line-height: 1.7;
}

.annual-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.annual-subject-card {
  padding: 24px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.annual-subject-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.annual-subject-card.passed {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.05);
}

.passed-ribbon {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--emerald);
  color: #000;
  font-weight: 800;
  font-size: 10.5px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.certs-toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.certs-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
}

.cert-card-item {
  padding: 24px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(251, 191, 36, 0.3);
  position: relative;
}

.cert-type-pill {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  font-weight: 800;
  display: inline-block;
  margin-bottom: 10px;
}

.cert-card-title {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
}

.cert-card-sub {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.cert-card-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 18px;
  font-size: 12.5px;
  color: #cbd5e1;
}

.cert-card-actions {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

/* ==========================================================================
   IRREGULAR VERBS TABLE
   ========================================================================== */

.verbs-search-box {
  padding: 16px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.verbs-search-box input {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: rgba(11, 15, 25, 0.7);
  border: 1px solid var(--border-glass);
  color: #fff;
  font-family: var(--font-khmer);
  font-size: 14px;
  outline: none;
}

.verbs-group-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.verb-filter-btn {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.verb-filter-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary-light);
}

.verbs-table-card {
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.modern-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13.5px;
}

.modern-table th {
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.04);
  color: #94a3b8;
  font-weight: 700;
  border-bottom: 1px solid var(--border-glass);
}

.modern-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: #e2e8f0;
}

.modern-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

/* ==========================================================================
   VIP PLANS GRID
   ========================================================================== */

.vip-plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 30px;
}

.plan-card {
  padding: 30px 24px;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  position: relative;
}

.plan-card.featured {
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 0 25px rgba(79, 70, 229, 0.25);
}

.plan-card.luxury {
  border-color: rgba(245, 158, 11, 0.5);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.2);
}

.plan-badge {
  font-size: 11px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
}

.plan-badge.hot {
  background: var(--primary);
  color: #fff;
}

.plan-badge.gold {
  background: var(--gold-gradient);
  color: #000;
}

.plan-title {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.plan-price {
  font-size: 32px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 18px;
}

.plan-price span {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 600;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13.5px;
  color: #cbd5e1;
  margin-bottom: 24px;
  flex: 1;
}

.license-box {
  padding: 24px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.license-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lic-icon {
  font-size: 28px;
}

.license-input-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.license-input-row input {
  flex: 1;
  min-width: 240px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: rgba(11, 15, 25, 0.7);
  border: 1px solid var(--border-glass);
  color: #fff;
  font-family: monospace;
  font-size: 16px;
  letter-spacing: 1px;
}

.payment-card {
  padding: 24px;
  border-radius: var(--radius-md);
}

.payment-card h3 {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.payment-card p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.qr-preview-box {
  display: flex;
  justify-content: center;
  padding: 16px;
}

.khqr-img {
  max-width: 260px;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   MODALS & OVERLAYS
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.25s ease;
}

.modal-overlay.hidden {
  display: none !important;
}

.modal-card {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-lg);
  padding: 28px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-card.max-w-lg {
  max-width: 600px;
}

.modal-card.cert-modal-card {
  max-width: 1000px;
  height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}
.modal-close:hover {
  color: #fff;
}

.modal-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 10px;
}

.modal-tabs .tab-btn {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
}

.modal-tabs .tab-btn.active {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.form-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-muted);
}

.form-group input {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(11, 15, 25, 0.8);
  border: 1px solid var(--border-glass);
  color: #fff;
  font-family: var(--font-khmer);
  font-size: 14px;
  outline: none;
}

.form-group input:focus {
  border-color: var(--primary-light);
}

.form-hint {
  font-size: 11px;
  color: var(--cyan);
}

.gmail-notice-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: #e0f2fe;
  font-size: 12px;
  margin-bottom: 18px;
}

.sync-info-box {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #c7d2fe;
  font-size: 12.5px;
  margin-bottom: 16px;
}

.sync-instructions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: #cbd5e1;
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--cyan);
  color: #000;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

.modal-footer-note {
  margin-top: 18px;
  text-align: center;
  font-size: 12.5px;
  color: var(--text-muted);
}

.modal-footer-note a {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 700;
}

/* Quiz Result Modal Elements */
.grade-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--gold-gradient);
  color: #000;
  font-size: 42px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px auto;
  box-shadow: 0 0 25px rgba(245, 158, 11, 0.4);
}

.grade-title-text {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.score-display-text {
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  margin-top: 4px;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
}

.review-answers-box {
  text-align: left;
}

.review-answers-box h4 {
  font-size: 14px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 220px;
  overflow-y: auto;
  padding-right: 4px;
}

.review-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  font-size: 12.5px;
  border-left: 3px solid #64748b;
}

.review-item.correct {
  border-left-color: var(--emerald);
  background: rgba(16, 185, 129, 0.05);
}

.review-item.wrong {
  border-left-color: var(--rose);
  background: rgba(244, 63, 94, 0.05);
}

/* Certificate Preview Iframe */
.cert-modal-toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.cert-iframe-wrapper {
  flex: 1;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #0f172a;
  border: 1px solid var(--border-glass);
}

.cert-iframe-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  animation: slideIn 0.3s ease;
  pointer-events: auto;
}

.toast.success { border-color: var(--emerald); color: #34d399; }
.toast.error { border-color: var(--rose); color: #fb7185; }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Mobile Bottom Nav */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(11, 15, 25, 0.95);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-glass);
  padding: 8px 12px;
  justify-content: space-around;
}

.m-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-khmer);
}

.m-nav-item.active {
  color: var(--cyan);
}

.m-icon {
  font-size: 20px;
}

.m-label {
  font-size: 10px;
  font-weight: 700;
}

/* ==========================================================================
   RESPONSIVE DESIGN (CHROME DESKTOP & MOBILE / TELEGRAM WEBAPP)
   ========================================================================== */

@media (max-width: 900px) {
  .hero-card {
    grid-template-columns: 1fr;
    padding: 24px;
  }
  .hero-art {
    display: none;
  }
  .lesson-layout {
    grid-template-columns: 1fr;
  }
  .ai-tutor-card {
    height: calc(100vh - 120px); /* Fill most of screen */
    border-radius: 0;
    margin: -24px; /* Negate container padding */
    padding: 15px;
    border: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-nav {
    display: flex;
  }
  .main-content {
    padding-bottom: 90px;
  }
  .hero-title {
    font-size: 24px;
  }
}

/* ==========================================================================
   FIREBASE EMAIL VERIFICATION & PROFILE MODALS
   ========================================================================== */

.verify-email-header {
  padding-bottom: 12px;
}

.verify-icon {
  font-size: 42px;
  margin-bottom: 4px;
  animation: pulseGlow 2s infinite ease-in-out;
}

@keyframes pulseGlow {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.verify-email-badge {
  display: inline-block;
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-family: var(--font-english);
  font-weight: 600;
  font-size: 14px;
  margin-top: 10px;
}

.verification-demo-hint {
  background: rgba(245, 158, 11, 0.1);
  border: 1px dashed rgba(245, 158, 11, 0.4);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin: 12px 0;
  font-size: 13px;
  color: #fde68a;
}

.btn-link-action {
  background: none;
  border: none;
  color: var(--cyan);
  cursor: pointer;
  font-family: var(--font-khmer);
  font-size: 13px;
  font-weight: 600;
  text-decoration: underline;
  transition: opacity 0.2s;
}

.btn-link-action:hover {
  opacity: 0.8;
}

.profile-avatar-large {
  width: 72px;
  height: 72px;
  margin: 0 auto;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  border: 3px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.profile-info-list {
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  border: 1px solid var(--border-glass);
}

.prof-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 14px;
}

.prof-item:last-child {
  border-bottom: none;
}

.prof-item .label {
  color: var(--text-muted);
}

.prof-item .val {
  font-weight: 600;
  color: var(--text-main);
}

.badge-status {
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
}

.badge-status.verified {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.badge-status.unverified {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.btn-outline-danger {
  background: transparent;
  border: 1px solid rgba(244, 63, 94, 0.4);
  color: #fb7185;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-family: var(--font-khmer);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-outline-danger:hover {
  background: rgba(244, 63, 94, 0.15);
  border-color: #f43f5e;
}

/* Print CSS */
@media print {
  .navbar, .mobile-nav, .ambient-glow, .certs-toolbar, .btn {
    display: none !important;
  }
  body {
    background: #fff !important;
    color: #000 !important;
  }
}

/* ==========================================================================
   STUDENT PHOTO & PROFILE SETUP SYSTEM
   ========================================================================== */

.student-photo-preview-wrapper {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  margin: 0 auto;
  position: relative;
  cursor: pointer;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.3), rgba(6, 182, 212, 0.3));
  border: 3px solid rgba(6, 182, 212, 0.6);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: all 0.25s ease;
}

.student-photo-preview-wrapper:hover {
  transform: scale(1.05);
  border-color: #38bdf8;
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.6);
}

.student-photo-preview-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.student-photo-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

#studentPhotoPlaceholderIcon {
  font-size: 32px;
}

.photo-upload-hint {
  font-size: 11px;
  color: #94a3b8;
  font-weight: 600;
}

.photo-edit-badge {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #0284c7;
  border: 2px solid #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.4);
}

.quick-avatar-list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.avatar-pill-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.avatar-pill-btn:hover {
  transform: scale(1.18);
  background: rgba(99, 102, 241, 0.3);
  border-color: #6366f1;
}

.user-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

/* ===================================================
   AI TUTOR STUDIO & CHATBOT STYLES
=================================================== */

.ai-studio-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 1100px;
  margin: 0 auto;
}

.ai-studio-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(20, 27, 45, 0.85), rgba(15, 23, 42, 0.95));
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.ai-studio-profile {
  display: flex;
  align-items: center;
  gap: 16px;
}

.ai-studio-avatar-ring {
  position: relative;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #3b82f6, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
}

.ai-studio-avatar-emoji {
  font-size: 30px;
}

.ai-studio-pulse-dot {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #10b981;
  border: 2px solid #0f172a;
  box-shadow: 0 0 8px #10b981;
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 7px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.ai-studio-name-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.ai-studio-name {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin: 0;
  font-family: var(--font-khmer-moul), var(--font-khmer);
}

.ai-badge-verified {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #34d399;
  font-size: 11.5px;
  font-weight: 600;
}

.ai-studio-sub {
  margin: 4px 0 0 0;
  font-size: 12.5px;
  color: var(--text-muted);
}

.ai-studio-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.engine-selector-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.engine-label {
  font-size: 12px;
  color: #cbd5e1;
  font-weight: 600;
}

.engine-select {
  background: rgba(15, 23, 42, 0.9);
  color: #fff;
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 12px;
  font-family: var(--font-khmer);
  cursor: pointer;
  outline: none;
}

.engine-select:focus {
  border-color: #6366f1;
}

/* Quick Tools Bar */
.ai-tools-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  white-space: nowrap;
}

.ai-tools-label {
  font-size: 12.5px;
  font-weight: 700;
  color: #cbd5e1;
  flex-shrink: 0;
}

.ai-tools-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #f1f5f9;
  font-size: 12px;
  font-family: var(--font-khmer);
  cursor: pointer;
  transition: all 0.2s ease;
}

.ai-tool-btn:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25), rgba(59, 130, 246, 0.25));
  border-color: rgba(99, 102, 241, 0.5);
  transform: translateY(-1px);
  color: #fff;
}

/* Main Studio Chat Card */
.ai-studio-chat-card {
  display: flex;
  flex-direction: column;
  height: 650px;
  border-radius: var(--radius-lg);
  padding: 18px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.ai-studio-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-right: 8px;
  margin-bottom: 12px;
  scrollbar-width: thin;
}

.ai-bubble-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.ai-bubble-author {
  font-weight: 700;
  font-size: 12px;
  color: #818cf8;
}

.ai-bubble-badge {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

.ai-bubble-content {
  font-size: 13.8px;
  line-height: 1.68;
  color: #f8fafc;
}

.ai-bubble-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.tts-btn, .copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-khmer);
}

.tts-btn:hover, .copy-btn:hover {
  background: rgba(99, 102, 241, 0.25);
  color: #fff;
  border-color: #6366f1;
}

.tts-btn.playing {
  background: #10b981 !important;
  color: #fff !important;
  animation: pulseGreen 1.5s infinite;
}

.studio-quick-prompts {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 10px;
  white-space: nowrap;
}

.ai-studio-input-bar {
  display: flex;
  gap: 10px;
  align-items: center;
}

.ai-studio-input-bar input {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: rgba(11, 15, 25, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-family: var(--font-khmer);
  font-size: 13.5px;
  outline: none;
  transition: border-color 0.2s;
}

.ai-studio-input-bar input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.3);
}

.record-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.record-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: #6366f1;
}

.record-btn.recording {
  background: #ef4444 !important;
  color: #fff !important;
  border-color: #dc2626 !important;
  animation: pulseRecording 1s infinite;
}

@keyframes pulseRecording {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
  50% { transform: scale(1.08); box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

/* ===================================================
   UNIVERSAL FLOATING AI ASSISTANT (FAB & DRAWER)
=================================================== */

.universal-ai-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
}

.floating-ai-fab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  border: 2px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(79, 70, 229, 0.5), 0 0 15px rgba(6, 182, 212, 0.4);
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.floating-ai-fab:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 12px 30px rgba(79, 70, 229, 0.7), 0 0 20px rgba(6, 182, 212, 0.6);
}

.ai-fab-icon {
  font-size: 22px;
}

.ai-fab-label {
  font-weight: 800;
  font-size: 13.5px;
  font-family: var(--font-khmer);
}

.ai-fab-pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px #10b981;
  animation: pulseGreen 2s infinite;
}

/* Utility Hidden */
.hidden {
  display: none !important;
}

#adminNavBtn.hidden,
#headerAdminBtn.hidden,
.mobile-bottom-nav #adminNavBtn.hidden,
.mobile-bottom-nav .m-nav-item#adminNavBtn.hidden,
.header-right-actions #headerAdminBtn.hidden {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

/* Floating Collapsible Chat Drawer */
.floating-chat-drawer {
  position: absolute;
  bottom: 64px;
  right: 0;
  width: 380px;
  max-width: calc(100vw - 32px);
  height: 520px;
  max-height: calc(100vh - 120px);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  padding: 14px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(99, 102, 241, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(99, 102, 241, 0.2);
  backdrop-filter: blur(16px);
  animation: drawerSlideUp 0.25s ease-out;
}

.floating-chat-drawer.hidden {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

@keyframes drawerSlideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 10px;
}

.drawer-tutor-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.drawer-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.drawer-name {
  font-size: 13.5px;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-khmer);
}

.drawer-status {
  font-size: 10px;
  color: #34d399;
}

.drawer-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.drawer-action-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}

.drawer-action-btn:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #fff;
}

.drawer-action-btn.close-btn:hover {
  background: rgba(239, 68, 68, 0.3);
  color: #f87171;
}

.drawer-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
  margin-bottom: 10px;
  scrollbar-width: thin;
}

.drawer-quick-prompts {
  display: flex;
  gap: 5px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: 8px;
  white-space: nowrap;
}

.drawer-pill {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  font-size: 10.5px;
  padding: 3px 8px;
  border-radius: 12px;
  cursor: pointer;
  font-family: var(--font-khmer);
  transition: all 0.15s;
}

.drawer-pill:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #fff;
}

.drawer-input-bar {
  display: flex;
  gap: 6px;
  align-items: center;
}

.drawer-input-bar input {
  flex: 1;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(11, 15, 25, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  font-family: var(--font-khmer);
  font-size: 12.5px;
  outline: none;
}

.drawer-input-bar input:focus {
  border-color: #6366f1;
}

.drawer-mic-btn {
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.drawer-send-btn {
  padding: 8px 14px;
}

@media (max-width: 640px) {
  .floating-chat-drawer {
    width: calc(100vw - 24px);
    right: -12px;
    height: 480px;
  }
  .ai-studio-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ====================================================
   AI BUBBLE ACTIONS & INTERACTIVE AUDIO PLAYER
   ==================================================== */
.ai-bubble-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.tts-btn, .copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #cbd5e1;
  font-family: var(--font-khmer, sans-serif);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.tts-btn:hover, .copy-btn:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.5);
  color: #fff;
  transform: translateY(-1px);
}

.tts-btn.playing {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.25), rgba(99, 102, 241, 0.25));
  border-color: #06b6d4;
  color: #38bdf8;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.4);
  animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 8px rgba(6, 182, 212, 0.3); }
  50% { box-shadow: 0 0 16px rgba(6, 182, 212, 0.7); }
}

/* Audio Player Interactive Widget */
.bubble-audio-player {
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid rgba(99, 102, 241, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 12px;
  padding: 10px 14px;
  margin-top: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  animation: slideDownFade 0.25s ease-out;
}

@keyframes slideDownFade {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.player-top-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.player-ctrl-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #f1f5f9;
  border-radius: 8px;
  padding: 5px 9px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-khmer, sans-serif);
  transition: all 0.15s ease;
  user-select: none;
}

.player-ctrl-btn:hover {
  background: rgba(99, 102, 241, 0.35);
  border-color: #6366f1;
  color: #fff;
  transform: translateY(-1px);
}

.player-ctrl-btn:active {
  transform: scale(0.96);
}

.player-ctrl-btn.play-pause-btn {
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  border: none;
  color: #fff;
  min-width: 34px;
  height: 34px;
  border-radius: 50%;
  padding: 0;
  font-size: 14px;
  box-shadow: 0 2px 10px rgba(6, 182, 212, 0.4);
}

.player-ctrl-btn.skip-btn {
  font-size: 11px;
  padding: 4px 8px;
  color: #94a3b8;
  background: rgba(255, 255, 255, 0.05);
}

.player-ctrl-btn.skip-btn:hover {
  color: #38bdf8;
  background: rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.4);
}

.player-ctrl-btn.stop-btn {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  font-size: 11.5px;
  margin-left: auto;
}

.player-ctrl-btn.stop-btn:hover {
  background: rgba(239, 68, 68, 0.35);
  border-color: #ef4444;
  color: #fff;
}

.player-slider-wrap {
  flex: 1;
  min-width: 110px;
  display: flex;
  align-items: center;
}

.player-seek-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.2);
  outline: none;
  cursor: pointer;
  transition: background 0.2s;
}

.player-seek-slider:hover {
  background: rgba(255, 255, 255, 0.35);
}

.player-seek-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #06b6d4;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.9);
  transition: transform 0.1s ease;
}

.player-seek-slider::-webkit-slider-thumb:hover {
  transform: scale(1.25);
  background: #38bdf8;
}

.player-seek-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #06b6d4;
  cursor: pointer;
  border: none;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.9);
}

.player-time {
  font-family: var(--font-english, monospace);
  font-size: 11.5px;
  font-weight: 600;
  color: #cbd5e1;
  white-space: nowrap;
  letter-spacing: 0.5px;
  padding: 0 4px;
}

/* ====================================================
   FULL NIGHT MODE (MIDNIGHT OLED) COMPONENT REFINEMENTS
   ==================================================== */

/* 1. Modal Overlays & Cards */
body.night-mode-full .modal-overlay {
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

body.night-mode-full .modal-card {
  background: rgba(11, 17, 32, 0.96);
  border: 1px solid rgba(99, 102, 241, 0.35);
  box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.9), 0 0 35px rgba(99, 102, 241, 0.25);
}

/* 2. Global Dark Inputs & Forms */
body.night-mode-full input[type="text"],
body.night-mode-full input[type="email"],
body.night-mode-full input[type="password"],
body.night-mode-full input[type="number"],
body.night-mode-full textarea,
body.night-mode-full select {
  background: rgba(7, 11, 20, 0.92) !important;
  color: #f8fafc !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  border-radius: var(--radius-sm);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body.night-mode-full input:focus,
body.night-mode-full textarea:focus,
body.night-mode-full select:focus {
  border-color: #6366f1 !important;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35), 0 0 16px rgba(99, 102, 241, 0.2) !important;
  outline: none;
}

/* 3. Hero Card & Sync Banners */
body.night-mode-full .hero-card {
  background: linear-gradient(135deg, rgba(13, 20, 36, 0.92) 0%, rgba(7, 11, 20, 0.95) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

body.night-mode-full .sync-banner {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.12) 0%, rgba(15, 23, 42, 0.85) 100%);
  border: 1px solid rgba(6, 182, 212, 0.35);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* 4. Lesson Curriculum Cards & Progress */
body.night-mode-full .month-tab-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #94a3b8;
}

body.night-mode-full .month-tab-btn.active {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.3) 0%, rgba(6, 182, 212, 0.25) 100%);
  border-color: #06b6d4;
  color: #fff;
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.35);
}

body.night-mode-full .lesson-card {
  background: rgba(13, 20, 36, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

body.night-mode-full .lesson-card:hover {
  background: rgba(20, 31, 56, 0.96);
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.7), 0 0 25px rgba(99, 102, 241, 0.3);
  transform: translateY(-3px);
}

/* 5. Irregular Verbs Table in Night Mode */
body.night-mode-full .verbs-table-container {
  background: rgba(11, 17, 32, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.6);
}

body.night-mode-full .verbs-table th {
  background: rgba(18, 28, 52, 0.95);
  color: #38bdf8;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

body.night-mode-full .verbs-table td {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: #f1f5f9;
}

body.night-mode-full .verbs-table tr:hover td {
  background: rgba(99, 102, 241, 0.15);
}

/* 6. AI Studio Card in Night Mode */
body.night-mode-full .ai-studio-chat-card {
  background: rgba(11, 17, 32, 0.94);
  border: 1px solid rgba(99, 102, 241, 0.35);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.75);
}

body.night-mode-full .chat-bubble.ai {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

body.night-mode-full .chat-bubble.user {
  background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  color: #fff;
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

/* 7. Lesson Drawer in Night Mode */
body.night-mode-full .lesson-drawer {
  background: rgba(8, 13, 25, 0.98);
  border-left: 1px solid rgba(99, 102, 241, 0.3);
  box-shadow: -15px 0 50px rgba(0, 0, 0, 0.85);
}

/* ====================================================
   DAY MODE: CRISP BLACK/DARK TEXT (ពេលថ្ងៃអក្សរខ្មៅច្បាស់)
   ==================================================== */
body.day-mode,
body.day-mode p,
body.day-mode span:not(.badge-status):not(.pulse-dot):not(.user-tier-badge):not(.gradient-text):not(.google-icon-svg):not(.theme-icon),
body.day-mode h1,
body.day-mode h2,
body.day-mode h3,
body.day-mode h4,
body.day-mode h5,
body.day-mode h6,
body.day-mode .hero-title,
body.day-mode .hero-desc,
body.day-mode .section-title h2,
body.day-mode .section-title p,
body.day-mode .brand-title,
body.day-mode .art-title,
body.day-mode .art-director,
body.day-mode .sync-title,
body.day-mode .sync-sub,
body.day-mode .nav-item,
body.day-mode .user-name,
body.day-mode .month-tab-btn,
body.day-mode .lesson-title,
body.day-mode .lesson-desc,
body.day-mode .lesson-name,
body.day-mode .card-title,
body.day-mode .card-desc,
body.day-mode .exam-card-title,
body.day-mode .exam-desc,
body.day-mode .modal-title,
body.day-mode .prof-item .val,
body.day-mode .prof-item .label,
body.day-mode .drawer-name,
body.day-mode .ai-bubble-content,
body.day-mode .ai-bubble-author,
body.day-mode .verbs-table th,
body.day-mode .verbs-table td,
body.day-mode label,
body.day-mode .stat-val,
body.day-mode .stat-label,
body.day-mode .quiz-question-text,
body.day-mode .quiz-option-text,
body.day-mode .lesson-drawer-content,
body.day-mode .lesson-section-title,
body.day-mode .lesson-explanation,
body.day-mode .grammar-rule,
body.day-mode .vocab-word,
body.day-mode .vocab-meaning,
body.day-mode .tts-btn,
body.day-mode .copy-btn,
body.day-mode .player-time,
body.day-mode .btn-glass,
body.day-mode .btn-outline {
  color: #0f172a !important;
}

body.day-mode .hero-desc,
body.day-mode .section-title p,
body.day-mode .sync-sub,
body.day-mode .lesson-desc,
body.day-mode .card-desc,
body.day-mode .art-director,
body.day-mode .prof-item .label,
body.day-mode .verbs-table td,
body.day-mode .text-muted,
body.day-mode .text-slate-400,
body.day-mode .text-slate-300 {
  color: #334155 !important;
}

/* Day Mode Navbar & Header */
body.day-mode .navbar {
  background: rgba(255, 255, 255, 0.94) !important;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

body.day-mode .nav-item {
  color: #334155 !important;
}
body.day-mode .nav-item:hover {
  color: #0f172a !important;
  background: rgba(0, 0, 0, 0.05) !important;
}
body.day-mode .nav-item.active {
  color: #4f46e5 !important;
  background: rgba(79, 70, 229, 0.1) !important;
  border-color: rgba(79, 70, 229, 0.3) !important;
}

/* Day Mode Glass Panels & Cards */
body.day-mode .glass-panel {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06) !important;
}

body.day-mode .hero-card {
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%) !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08) !important;
}

body.day-mode .hero-badge {
  background: rgba(79, 70, 229, 0.1) !important;
  border-color: rgba(79, 70, 229, 0.25) !important;
  color: #4f46e5 !important;
}

body.day-mode .art-card {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08) !important;
}

body.day-mode .sync-banner {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.08) 0%, #ffffff 100%) !important;
  border: 1px solid #cbd5e1 !important;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05) !important;
}

/* Day Mode Lesson Cards & Tabs */
body.day-mode .month-tab-btn {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
}
body.day-mode .month-tab-btn.active {
  background: #4f46e5 !important;
  color: #ffffff !important;
  border-color: #4f46e5 !important;
}

body.day-mode .lesson-card {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05) !important;
}
body.day-mode .lesson-card:hover {
  background: #f8fafc !important;
  border-color: #818cf8 !important;
  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.12) !important;
}

/* Day Mode Modals */
body.day-mode .modal-overlay {
  background: rgba(15, 23, 42, 0.45) !important;
  backdrop-filter: blur(8px) !important;
}
body.day-mode .modal-card {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15) !important;
}
body.day-mode .profile-info-list {
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
}

/* Day Mode Inputs */
body.day-mode input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
body.day-mode textarea,
body.day-mode select {
  background: #ffffff !important;
  color: #0f172a !important;
  border: 1px solid #cbd5e1 !important;
}
body.day-mode input:focus,
body.day-mode textarea:focus,
body.day-mode select:focus {
  border-color: #4f46e5 !important;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2) !important;
}

/* Day Mode Verbs Table */
body.day-mode .verbs-table-container {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05) !important;
}
body.day-mode .verbs-table th {
  background: #f1f5f9 !important;
  color: #0f172a !important;
  border-bottom: 2px solid #cbd5e1 !important;
}
body.day-mode .verbs-table td {
  border-bottom: 1px solid #e2e8f0 !important;
  color: #0f172a !important;
}
body.day-mode .verbs-table tr:hover td {
  background: rgba(79, 70, 229, 0.05) !important;
}

/* Day Mode AI Tutor Studio */
body.day-mode .ai-studio-chat-card {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06) !important;
}
body.day-mode .chat-bubble.ai {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  color: #0f172a !important;
}
body.day-mode .ai-bubble-badge {
  background: rgba(79, 70, 229, 0.1) !important;
  color: #4f46e5 !important;
  border: 1px solid rgba(79, 70, 229, 0.25) !important;
}
body.day-mode .tts-btn,
body.day-mode .copy-btn {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
}
body.day-mode .tts-btn:hover,
body.day-mode .copy-btn:hover {
  background: #e0e7ff !important;
  color: #4338ca !important;
  border-color: #6366f1 !important;
}

/* Day Mode Floating Drawer */
body.day-mode .floating-chat-drawer {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15) !important;
}
body.day-mode .drawer-pill {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
}
body.day-mode .drawer-pill:hover {
  background: #4f46e5 !important;
  color: #ffffff !important;
}
body.day-mode .drawer-action-btn {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
}

/* Day Mode Lesson Drawer */
body.day-mode .lesson-drawer {
  background: #ffffff !important;
  border-left: 1px solid #e2e8f0 !important;
  box-shadow: -10px 0 35px rgba(0, 0, 0, 0.1) !important;
}
body.day-mode .lesson-tab-btn {
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
  color: #334155 !important;
}
body.day-mode .lesson-tab-btn.active {
  background: #4f46e5 !important;
  color: #ffffff !important;
}
body.day-mode .lesson-vocab-item {
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
}

/* Day Mode Audio Player */
body.day-mode .bubble-audio-player {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08) !important;
}
body.day-mode .player-ctrl-btn {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  color: #0f172a !important;
}
body.day-mode .player-ctrl-btn.play-pause-btn {
  background: #4f46e5 !important;
  color: #ffffff !important;
}
body.day-mode .player-seek-slider {
  background: #e2e8f0 !important;
}
body.day-mode .player-time {
  color: #334155 !important;
}

/* Ambient glow subtle in day mode */
body.day-mode .ambient-glow {
  opacity: 0.03 !important;
}

/* ==========================================================================
   LESSON YOUTUBE VIDEO SECTION & CONTROLS
   ========================================================================== */

.lesson-video-box {
  margin-bottom: 24px;
  padding: 18px;
  border-radius: 20px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(16px);
}

.lesson-video-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
  flex-wrap: wrap;
}

.video-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.video-badge-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(220, 38, 38, 0.4));
  border: 1px solid rgba(239, 68, 68, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.video-header-title {
  font-size: 16px;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-khmer), var(--font-outfit), sans-serif;
}

.video-header-sub {
  font-size: 12.5px;
  color: #94a3b8;
  font-family: var(--font-khmer), sans-serif;
}

.admin-manage-video-btn {
  border-color: rgba(99, 102, 241, 0.4);
  color: #a5b4fc;
}

.admin-manage-video-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  color: #c7d2fe;
}

/* 16:9 Responsive Video Aspect Ratio Container */
.video-player-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Ratio */
  height: 0;
  border-radius: 16px;
  overflow: hidden;
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5);
}

.yt-player-wrapper,
.yt-player-wrapper iframe,
#ytPlayerIframe,
#ytPlayerIframe iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Custom Ended Overlay - Blocks YouTube Suggested Videos Completely */
.video-ended-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(11, 15, 25, 0.94);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 25;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}

.video-ended-card {
  max-width: 440px;
  width: 100%;
  text-align: center;
  background: rgba(30, 41, 59, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
}

.ended-icon {
  font-size: 42px;
  margin-bottom: 10px;
  animation: bounce 1.5s infinite;
}

.ended-title {
  font-size: 18px;
  font-weight: 800;
  color: #38bdf8;
  margin-bottom: 8px;
  font-family: var(--font-khmer);
}

.ended-sub {
  font-size: 13px;
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 20px;
  font-family: var(--font-khmer);
}

.ended-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Placeholder when no video exists */
.no-video-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  background: radial-gradient(circle at center, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.9));
  border: 2px dashed rgba(255, 255, 255, 0.12);
  border-radius: 16px;
}

.placeholder-icon {
  font-size: 44px;
  margin-bottom: 12px;
  opacity: 0.8;
}

.placeholder-title {
  font-size: 15px;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 6px;
  font-family: var(--font-khmer);
}

.placeholder-sub {
  font-size: 12.5px;
  color: #94a3b8;
  max-width: 400px;
  font-family: var(--font-khmer);
}

/* Admin Modal Thumbnail Preview */
.admin-video-preview-box {
  background: rgba(15, 23, 42, 0.7);
  padding: 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.preview-thumbnail-wrap {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  max-height: 200px;
}

.preview-thumbnail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.preview-badge {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: #38bdf8;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
}

/* Day Mode Compatibility for Video Box */
body.day-mode .lesson-video-box {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06) !important;
}

body.day-mode .video-header-title {
  color: #0f172a !important;
}

body.day-mode .video-header-sub {
  color: #475569 !important;
}

body.day-mode .video-player-container {
  border-color: #cbd5e1 !important;
}

body.day-mode .no-video-placeholder {
  background: #f8fafc !important;
  border-color: #cbd5e1 !important;
}

body.day-mode .placeholder-title {
  color: #0f172a !important;
}

body.day-mode .placeholder-sub {
  color: #64748b !important;
}

body.day-mode .video-ended-card {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12) !important;
}

body.day-mode .ended-title {
  color: #0284c7 !important;
}

body.day-mode .ended-sub {
  color: #334155 !important;
}

/* ==========================================================================
   BEGINNER COURSE & TEACHER PISETH STYLES
   ========================================================================== */

.course-level-switch-wrap {
  width: 100%;
  margin-bottom: 20px;
}

.course-level-switcher {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 8px;
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* 5-Level switcher (2+2+1 grid) */
.course-level-switcher-5 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 10px;
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.course-level-switcher-5 > button:last-child {
  grid-column: 1 / -1;
}

.course-level-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: transparent;
  color: #94a3b8;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: left;
  min-width: 0;
}

.course-level-btn:hover:not(.locked-level) {
  background: rgba(255, 255, 255, 0.05);
  color: #ffffff;
}

.course-level-btn.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(6, 182, 212, 0.15));
  border-color: rgba(16, 185, 129, 0.4);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.2);
}

#courseLevelStandardBtn.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(56, 189, 248, 0.15));
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.2);
}

/* Locked Levels */
.course-level-btn.locked-level {
  opacity: 0.5;
  cursor: not-allowed;
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed rgba(255,255,255,0.1);
}

.course-level-btn.locked-level:hover {
  background: rgba(239, 68, 68, 0.06);
  border-color: rgba(239, 68, 68, 0.25);
  opacity: 0.7;
}

.lock-hint {
  color: #f87171 !important;
  font-size: 10px !important;
  font-style: italic;
}

.course-sub {
  font-size: 10.5px;
  color: #64748b;
  font-weight: 500;
}

.course-icon {
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-btn-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.course-badge {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #34d399;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#courseLevelStandardBtn .course-badge {
  color: #38bdf8;
}
#courseLevelElementaryBtn .course-badge { color: #f59e0b; }
#courseLevelIntermediateBtn .course-badge { color: #a78bfa; }
#courseLevelAdvancedBtn .course-badge { color: #fb923c; }

.course-title {
  font-size: 13.5px;
  font-weight: 800;
  font-family: var(--font-khmer);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Beginner Final Exam Card */
.beginner-final-exam-card {
  border: 2px solid rgba(245, 158, 11, 0.4);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(16, 185, 129, 0.08));
  border-radius: 18px;
  padding: 20px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.beginner-final-exam-card::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px; right: -1px;
  height: 3px;
  background: linear-gradient(90deg, #f59e0b, #10b981, #06b6d4);
  border-radius: 18px 18px 0 0;
}

.final-exam-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.final-exam-icon {
  font-size: 42px;
  filter: drop-shadow(0 0 12px rgba(245, 158, 11, 0.6));
}

.final-exam-info h3 {
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-khmer);
  margin: 0 0 4px;
}

.final-exam-info p {
  font-size: 13px;
  color: #94a3b8;
  font-family: var(--font-khmer);
  margin: 0;
}

.final-exam-progress {
  margin-bottom: 14px;
}

.final-exam-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #94a3b8;
  margin-bottom: 6px;
  font-family: var(--font-khmer);
}

.final-exam-progress-bar {
  height: 10px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
}

.final-exam-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #06b6d4);
  border-radius: 99px;
  transition: width 0.6s ease;
}

.btn-final-exam {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  border: none;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 800;
  font-family: var(--font-khmer);
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
}

.btn-final-exam:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.5);
}

.btn-final-exam:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  background: rgba(255,255,255,0.1);
  box-shadow: none;
}

.graduated-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2));
  border: 1px solid rgba(16, 185, 129, 0.5);
  border-radius: 99px;
  font-size: 13px;
  font-weight: 700;
  color: #34d399;
  font-family: var(--font-khmer);
  margin-top: 10px;
}

/* Instructor Banner Card */
.course-instructor-card {
  padding: 20px;
  border-radius: 20px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 22px;
  backdrop-filter: blur(14px);
}

.instructor-card-content {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.instructor-avatar-wrap {
  position: relative;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(6, 182, 212, 0.25));
  border: 2px solid rgba(16, 185, 129, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.instructor-avatar-emoji {
  font-size: 32px;
}

.instructor-details {
  flex: 1;
}

.instructor-name-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.instructor-name {
  font-size: 18px;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-khmer);
  margin: 0;
}

.instructor-bio {
  font-size: 13.5px;
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 12px;
  font-family: var(--font-khmer);
}

.instructor-badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill-chip {
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 12px;
  font-weight: 600;
  color: #e2e8f0;
  font-family: var(--font-khmer);
}

.beginner-week-card {
  border-left: 4px solid #10b981;
}

.beginner-lesson-item:hover {
  border-color: #10b981;
}

/* Day Mode Overrides for Course Switcher & Instructor */
body.day-mode .course-level-switcher,
body.day-mode .course-level-switcher-5 {
  background: #ffffff !important;
  border-color: #cbd5e1 !important;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05) !important;
}

body.day-mode .course-level-btn {
  color: #64748b !important;
}

body.day-mode .course-level-btn.active {
  background: #ecfdf5 !important;
  border-color: #10b981 !important;
  color: #065f46 !important;
}

body.day-mode #courseLevelStandardBtn.active {
  background: #eff6ff !important;
  border-color: #3b82f6 !important;
  color: #1e40af !important;
}

body.day-mode .course-level-btn.locked-level {
  background: rgba(0,0,0,0.02) !important;
  border-color: #e2e8f0 !important;
}

body.day-mode .beginner-final-exam-card {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.06), rgba(16, 185, 129, 0.06)) !important;
  border-color: rgba(245, 158, 11, 0.3) !important;
}

body.day-mode .final-exam-info h3 {
  color: #0f172a !important;
}

body.day-mode .course-sub {
  color: #94a3b8 !important;
}

body.day-mode .course-title {
  color: #0f172a !important;
}

body.day-mode .course-instructor-card {
  background: #ffffff !important;
  border-color: #cbd5e1 !important;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06) !important;
}

body.day-mode .instructor-name {
  color: #0f172a !important;
}

body.day-mode .instructor-bio {
  color: #334155 !important;
}

body.day-mode .pill-chip {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
  color: #0f172a !important;
}

.lesson-locked {
  opacity: 0.45;
  cursor: not-allowed !important;
  pointer-events: all;
  background: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.01),
    rgba(255,255,255,0.01) 5px,
    rgba(0,0,0,0.04) 5px,
    rgba(0,0,0,0.04) 10px
  ) !important;
}

.lesson-locked:hover {
  opacity: 0.55;
  border-color: rgba(239, 68, 68, 0.3) !important;
}

body.day-mode .lesson-locked {
  opacity: 0.4;
}

@media (max-width: 640px) {
  .course-level-switcher {
    grid-template-columns: 1fr;
  }
  .course-level-switcher-5 {
    grid-template-columns: 1fr;
  }
  .course-level-switcher-5 > button:last-child {
    grid-column: auto;
  }
}

/* ==========================================================================
   MOBILE-FIRST RESPONSIVE DESIGN SYSTEM (BASED ON OFFICIAL SMARTPHONE MOCKUP)
   ========================================================================== */

/* 1. Global Container & Mobile-First Frame */
.app-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 480px;
  margin: 0 auto;
  background: #090e1a;
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.85);
  overflow-x: hidden;
}

@media (min-width: 769px) {
  body {
    background-color: #030712;
    background-image: radial-gradient(circle at 50% 15%, rgba(30, 41, 59, 0.5) 0%, rgba(3, 7, 18, 0.98) 100%);
  }
}

.main-content {
  flex: 1;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  padding: 12px 14px 95px 14px !important;
}

/* 2. Mobile App Top Header */
.mobile-app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(9, 14, 26, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.mobile-app-header .nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.mobile-app-header .brand-logo-img {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: contain;
  border: 1.5px solid rgba(251, 191, 36, 0.6);
  background: #fff;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.4);
}

.header-brand-title {
  font-family: var(--font-english, sans-serif);
  font-weight: 800;
  font-size: 16px;
  color: #ffffff;
  letter-spacing: -0.2px;
  line-height: 1.1;
}

.header-brand-sub {
  font-size: 11px;
  color: #38bdf8;
  font-weight: 600;
  letter-spacing: 0.2px;
  display: block;
}

.header-right-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-action-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 15px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.header-action-icon-btn:hover {
  background: rgba(56, 189, 248, 0.16);
  border-color: rgba(56, 189, 248, 0.45);
  transform: scale(1.06);
}

.header-action-icon-btn:active {
  transform: scale(0.95);
}

.user-badge-mini {
  cursor: pointer;
}

.avatar-ring-mini {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #000;
  font-size: 13px;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
  overflow: hidden;
}

.avatar-ring-mini img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 3. Hero Section (Ultra-Modern Futuristic OLED Glassmorphism) */
.mobile-hero-section {
  margin-bottom: 18px;
}

.mobile-hero-card {
  background: radial-gradient(130% 130% at 15% 20%, rgba(30, 58, 138, 0.45) 0%, rgba(15, 23, 42, 0.88) 65%),
              linear-gradient(145deg, rgba(30, 41, 59, 0.75) 0%, rgba(8, 14, 28, 0.98) 100%);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: 24px;
  padding: 18px 16px;
  display: grid;
  grid-template-columns: 1fr 115px;
  gap: 12px;
  align-items: center;
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.6), 0 0 25px rgba(56, 189, 248, 0.12), inset 0 1px 1px rgba(255, 255, 255, 0.18);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.mobile-hero-card:hover {
  border-color: rgba(56, 189, 248, 0.45);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 32px rgba(56, 189, 248, 0.2), inset 0 1px 1px rgba(255, 255, 255, 0.25);
}

.mobile-hero-card::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 170px;
  height: 170px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.28) 0%, rgba(139, 92, 246, 0.12) 50%, transparent 75%);
  pointer-events: none;
  animation: heroAuraPulse 6s ease-in-out infinite alternate;
}

@keyframes heroAuraPulse {
  0% { transform: scale(0.9) translate(0, 0); opacity: 0.6; }
  100% { transform: scale(1.15) translate(-10px, 10px); opacity: 0.9; }
}

.mobile-hero-title {
  font-size: 17px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.35;
  margin-bottom: 4px;
  font-family: var(--font-khmer);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
  letter-spacing: -0.2px;
}

.mobile-hero-subtitle {
  font-size: 11.5px;
  color: #93c5fd;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.35;
  display: flex;
  align-items: center;
  gap: 5px;
}

.mobile-hero-subtitle::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #38bdf8;
  box-shadow: 0 0 8px #38bdf8;
}

.mobile-hero-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.btn-start-learning {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #4f46e5 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 9999px;
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 700;
  font-family: var(--font-english, sans-serif);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.35);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.btn-start-learning::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transform: skewX(-25deg);
  transition: 0.6s ease;
}

.btn-start-learning:hover::after {
  left: 150%;
}

.btn-start-learning:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.65);
}

.btn-start-learning:active {
  transform: scale(0.96);
}

.btn-ai-chatbot {
  background: rgba(15, 23, 42, 0.82);
  color: #f1f5f9;
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 9999px;
  padding: 7px 16px;
  font-size: 11.5px;
  font-weight: 600;
  font-family: var(--font-english, sans-serif);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.2);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-ai-chatbot:hover {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(59, 130, 246, 0.25));
  border-color: rgba(139, 92, 246, 0.8);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45);
}

.btn-ai-chatbot:active {
  transform: scale(0.96);
}

.btn-dictionary {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.22) 0%, rgba(16, 185, 129, 0.22) 100%);
  color: #2dd4bf;
  border: 1px solid rgba(45, 212, 191, 0.45);
  border-radius: 9999px;
  padding: 7px 16px;
  font-size: 11.5px;
  font-weight: 700;
  font-family: var(--font-khmer, sans-serif);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.2);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-dictionary:hover {
  background: linear-gradient(135deg, #0891b2 0%, #059669 100%);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
}

.btn-dictionary:active {
  transform: scale(0.96);
}

.hero-illustration-frame {
  width: 112px;
  height: 112px;
  border-radius: 20px;
  overflow: hidden;
  border: 1.5px solid rgba(56, 189, 248, 0.3);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 0 20px rgba(56, 189, 248, 0.2);
  background: #090e1a;
  position: relative;
}

.hero-illustration-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-hero-card:hover .hero-illustration-img {
  transform: scale(1.08) rotate(1deg);
}

/* 4. Course Categories Carousel (Mockup Matching) */
.course-categories-section {
  margin-bottom: 18px;
}

.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  padding: 0 2px;
}

.section-title-sm {
  font-size: 14.5px;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-english, sans-serif);
  letter-spacing: -0.2px;
}

.categories-carousel-scroll {
  display: flex;
  gap: 11px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 2px 2px 10px 2px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.categories-carousel-scroll::-webkit-scrollbar {
  display: none;
}

.category-card-item {
  flex: 0 0 140px;
  scroll-snap-align: start;
  background: #111a2e;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.category-card-item:hover {
  transform: translateY(-2px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.5);
}

.category-card-thumb {
  position: relative;
  width: 100%;
  height: 86px;
  overflow: hidden;
  background: #0d1527;
}

.category-card-thumb .cat-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.category-card-item:hover .cat-img {
  transform: scale(1.06);
}

.cat-play-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(4px);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.cat-school-logo {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.85);
  padding: 1px;
  border: 1px solid rgba(251, 191, 36, 0.5);
}

.cat-school-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 50%;
}

.category-card-info {
  padding: 8px 9px 9px 9px;
}

.cat-title {
  font-size: 13px;
  font-weight: 700;
  color: #f8fafc;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cat-sub {
  font-size: 9.5px;
  color: #94a3b8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 5. Learning Dashboard (Compact 2x2 Grid) */
.learning-dashboard-section {
  margin-bottom: 18px;
}

.dashboard-compact-2x2-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 9px;
  margin-bottom: 10px;
}

.dash-stat-compact-card {
  background: #111a2e;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.dash-stat-compact-card:hover {
  background: #14223d;
  border-color: rgba(56, 189, 248, 0.35);
  transform: translateY(-1px);
}

.stat-ring-wrap {
  position: relative;
  width: 48px;
  height: 48px;
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-svg-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 3.2;
}

.ring-fill {
  fill: none;
  stroke-width: 3.2;
  stroke-linecap: round;
  transition: stroke-dasharray 0.6s ease;
}

.ring-fill-cyan { stroke: #38bdf8; }
.ring-fill-pink { stroke: #ec4899; }
.ring-fill-green { stroke: #10b981; }

.stat-ring-text {
  position: absolute;
  font-size: 10.5px;
  font-weight: 800;
  color: #f8fafc;
  font-family: var(--font-english, sans-serif);
}

.stat-ring-icon {
  font-size: 24px;
}

.dash-stat-label {
  font-size: 12px;
  font-weight: 700;
  color: #f8fafc;
  line-height: 1.2;
}

.dash-stat-label.vip-gold {
  color: #fbbf24;
}

.dash-stat-sub {
  font-size: 9px;
  color: #64748b;
  margin-top: 2px;
}

.dash-pills-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
}

.dash-action-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  transition: all 0.2s ease;
}

.pill-blue {
  background: rgba(2, 132, 199, 0.16);
  border: 1px solid rgba(56, 189, 248, 0.32);
  color: #38bdf8;
}

.pill-purple {
  background: rgba(147, 51, 234, 0.16);
  border: 1px solid rgba(168, 85, 247, 0.32);
  color: #c084fc;
}

.dash-action-pill:hover {
  transform: scale(1.02);
}

/* 6. Quick AI Chat Bar (Mockup Matching) */
.quick-ai-chat-section {
  margin-bottom: 18px;
}

.ai-glow-badge {
  font-size: 10.5px;
  font-weight: 800;
  color: #c084fc;
  background: rgba(168, 85, 247, 0.16);
  border: 1px solid rgba(168, 85, 247, 0.35);
  padding: 2px 8px;
  border-radius: 12px;
}

.quick-ai-input-card {
  background: #111a2e;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  padding: 4px 5px 4px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.quick-ai-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #ffffff;
  font-size: 11.5px;
  font-family: var(--font-khmer);
}

.quick-ai-input::placeholder {
  color: #64748b;
  font-size: 11px;
}

.quick-ai-send-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  border: none;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 12px;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.45);
  transition: transform 0.2s ease;
}

.quick-ai-send-btn:hover {
  transform: scale(1.08);
}

/* 7. 'Your Teacher' Card (Mockup Matching) */
.your-teacher-card-wrap {
  margin-bottom: 20px;
}

.your-teacher-card {
  background: #111a2e;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 20px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.teacher-avatar-col {
  position: relative;
  width: 46px;
  height: 46px;
  flex-shrink: 0;
}

.teacher-card-avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #38bdf8;
  background: #0f172a;
}

.teacher-online-dot {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #10b981;
  border: 2px solid #111a2e;
}

.teacher-details-col {
  flex: 1;
  min-width: 0;
}

.teacher-school-name {
  font-size: 12.5px;
  font-weight: 800;
  color: #ffffff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.teacher-name-sub {
  font-size: 10.5px;
  color: #94a3b8;
  margin-bottom: 5px;
}

.teacher-quick-actions {
  display: flex;
  gap: 7px;
}

.btn-teacher-action {
  padding: 4px 9px;
  border-radius: 12px;
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.btn-contact {
  background: rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-ai-task {
  background: rgba(2, 132, 199, 0.22);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.32);
}

.btn-teacher-action:hover {
  transform: scale(1.04);
}

/* 8. Fixed Floating Island Glass Dock (Ultra-Modern iOS / visionOS Style) */
.mobile-bottom-nav {
  position: fixed;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 20px);
  max-width: 520px;
  margin: 0 auto;
  z-index: 1000;
  background: rgba(10, 16, 32, 0.84);
  backdrop-filter: blur(28px) saturate(200%);
  -webkit-backdrop-filter: blur(28px) saturate(200%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  padding: 6px 3px 6px 3px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.65), 0 0 24px rgba(56, 189, 248, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.18);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .mobile-bottom-nav {
    bottom: max(12px, env(safe-area-inset-bottom, 12px));
  }
}

.mobile-bottom-nav .m-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: #94a3b8;
  font-size: 9px;
  font-weight: 600;
  padding: 4px 1px;
  cursor: pointer;
  border-radius: 16px;
  position: relative;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: all 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mobile-bottom-nav .m-nav-item .m-icon {
  font-size: 19px;
  margin-bottom: 2px;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.25s ease;
}

.mobile-bottom-nav .m-nav-item .m-label {
  font-size: 9px;
  letter-spacing: 0.1px;
  white-space: nowrap;
}

.mobile-bottom-nav .m-nav-item:hover {
  color: #38bdf8;
  background: rgba(255, 255, 255, 0.04);
}

.mobile-bottom-nav .m-nav-item:active {
  transform: scale(0.92);
}

.mobile-bottom-nav .m-nav-item.active {
  color: #38bdf8;
}

.mobile-bottom-nav .m-nav-item.active .m-icon {
  transform: translateY(-2px) scale(1.18);
  filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.85));
}

.mobile-bottom-nav .m-nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 0px;
  width: 16px;
  height: 2.5px;
  border-radius: 9999px;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.9), 0 0 4px #818cf8;
}

.mobile-bottom-nav .m-nav-item.m-nav-ai.active::after {
  display: none;
}

.m-nav-ai {
  position: relative;
  top: -14px;
  flex: 1.15;
}

.m-ai-bubble {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7 0%, #3b82f6 35%, #8b5cf6 70%, #ec4899 100%);
  background-size: 200% 200%;
  animation: holographicShimmer 4s ease infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.65), 0 0 16px rgba(139, 92, 246, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.4);
  border: 3px solid #070c18;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
}

@keyframes holographicShimmer {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.m-ai-icon {
  font-size: 22px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.m-nav-ai:hover .m-ai-bubble,
.m-nav-ai.active .m-ai-bubble {
  transform: scale(1.14) translateY(-2px);
  box-shadow: 0 12px 30px rgba(59, 130, 246, 0.85), 0 0 25px rgba(236, 72, 153, 0.6);
}

/* 9. Search Modal & Results Box */
.search-results-box {
  padding: 4px 12px 14px 12px;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 7px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.search-result-item:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.35);
  transform: translateX(3px);
}

.search-res-badge {
  font-size: 9.5px;
  font-weight: 700;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.15);
  padding: 2px 6px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 3px;
}

.search-res-title {
  font-size: 13px;
  font-weight: 700;
  color: #f8fafc;
}

.search-res-sub {
  font-size: 10.5px;
  color: #94a3b8;
}

.search-res-arrow {
  font-size: 12px;
  color: #64748b;
}

/* ============================================================
   10. MOBILE-FIRST ENGLISH LESSONS SCREEN (MOCKUP 1)
   ============================================================ */
.courses-mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: transparent;
  margin-bottom: 4px;
}

.courses-back-btn,
.ai-header-back-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.courses-back-btn:hover,
.ai-header-back-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.back-arrow {
  font-size: 24px;
  line-height: 1;
  font-weight: 300;
  margin-top: -2px;
}

.courses-header-titles {
  text-align: center;
  flex: 1;
}

.courses-main-title {
  font-size: 17px;
  font-weight: 800;
  color: #f8fafc;
  margin: 0;
  letter-spacing: -0.3px;
}

.courses-sub-title {
  font-size: 11px;
  font-weight: 600;
  color: #94a3b8;
  margin: 1px 0 0 0;
}

.courses-search-toggle-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 15px;
  transition: all 0.2s;
}

.courses-search-toggle-btn:hover {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

.courses-search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 4px 14px 12px 14px;
  padding: 8px 14px;
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  transition: all 0.2s ease;
}

.courses-search-bar:focus-within {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.courses-search-icon {
  font-size: 14px;
  opacity: 0.7;
}

.courses-search-bar input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 13px;
  font-weight: 500;
}

.courses-search-clear {
  background: transparent;
  border: none;
  color: #64748b;
  font-size: 12px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 50%;
}

.courses-search-clear:hover {
  color: #cbd5e1;
}

.courses-filter-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px 12px 14px;
  overflow-x: auto;
  scrollbar-width: none;
}

.courses-filter-tabs::-webkit-scrollbar {
  display: none;
}

.course-filter-tab {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: #94a3b8;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.course-filter-tab:hover {
  background: rgba(255, 255, 255, 0.09);
  color: #f1f5f9;
}

.course-filter-tab.active {
  background: #2563eb;
  color: #ffffff;
  border-color: #3b82f6;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

/* Accordion Units Container */
.courses-units-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 85px;
}

.unit-accordion-item {
  border-radius: 18px;
  background: rgba(18, 25, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.07);
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  transition: border-color 0.2s;
}

.unit-accordion-item:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.unit-header-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: transparent;
  border: none;
  color: #f8fafc;
  cursor: pointer;
  text-align: left;
}

.unit-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.unit-header-icon {
  font-size: 20px;
}

.unit-header-title-box {
  display: flex;
  flex-direction: column;
}

.unit-header-title {
  font-size: 14px;
  font-weight: 800;
  color: #f8fafc;
}

.unit-header-sub {
  font-size: 11px;
  color: #94a3b8;
  margin-top: 1px;
}

.unit-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.unit-badge-vip {
  font-size: 10px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 8px;
  background: rgba(234, 179, 8, 0.15);
  border: 1px solid rgba(234, 179, 8, 0.35);
  color: #facc15;
}

.unit-chevron {
  font-size: 14px;
  color: #94a3b8;
  transition: transform 0.25s ease;
}

.unit-accordion-item.collapsed .unit-chevron {
  transform: rotate(-90deg);
}

.unit-accordion-item.collapsed .unit-lessons-body {
  display: none;
}

.unit-lessons-body {
  padding: 4px 12px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Mobile Lesson Card */
.mobile-lesson-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.mobile-lesson-card:hover {
  background: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-1px);
}

.mobile-lesson-card.completed {
  border-color: rgba(16, 185, 129, 0.25);
  background: rgba(16, 185, 129, 0.04);
}

.mobile-lesson-card.locked {
  opacity: 0.65;
  filter: grayscale(0.2);
}

.lesson-card-thumb {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}

.lesson-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lesson-card-body {
  flex: 1;
  min-width: 0;
}

.lesson-card-title {
  font-size: 13px;
  font-weight: 700;
  color: #f8fafc;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-card-meta {
  font-size: 11px;
  color: #94a3b8;
  margin: 2px 0;
  display: flex;
  align-items: center;
  gap: 4px;
}

.lesson-card-desc {
  font-size: 11px;
  color: #64748b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-badge-completed {
  font-size: 10px;
  font-weight: 700;
  color: #34d399;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 3px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}

.lesson-badge-ongoing {
  font-size: 10px;
  font-weight: 700;
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 3px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}

.lesson-btn-inprogress {
  font-size: 10.5px;
  font-weight: 700;
  color: #ffffff;
  background: #10b981;
  padding: 4px 10px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  box-shadow: 0 3px 8px rgba(16, 185, 129, 0.35);
}

.lesson-badge-locked {
  font-size: 10px;
  font-weight: 700;
  color: #94a3b8;
  background: rgba(100, 116, 139, 0.15);
  border: 1px solid rgba(100, 116, 139, 0.25);
  padding: 3px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}

/* Floating Bottom Progress Card */
.courses-bottom-progress-card {
  position: fixed;
  bottom: 82px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 28px);
  max-width: 452px;
  z-index: 95;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.55);
}

.courses-progress-left {
  flex: 1;
  margin-right: 12px;
}

.courses-progress-label {
  font-size: 11px;
  font-weight: 700;
  color: #cbd5e1;
  margin-bottom: 5px;
}

.courses-progress-bar-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.courses-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #06b6d4);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.courses-next-unit-btn {
  padding: 7px 14px;
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 11.5px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  transition: all 0.2s;
}

.courses-next-unit-btn:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

/* ============================================================
   11. MOBILE-FIRST AI TUTOR STUDIO SCREEN (MOCKUP 2)
   ============================================================ */
.mobile-ai-studio {
  display: flex;
  flex-direction: column;
}

.ai-tutor-mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(15, 20, 34, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.ai-header-center-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ai-school-logo-mini {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.05);
}

.ai-school-name {
  font-size: 13.5px;
  font-weight: 800;
  color: #f8fafc;
  line-height: 1.2;
}

.ai-school-tag {
  font-size: 9.5px;
  color: #94a3b8;
  font-weight: 500;
}

.ai-header-vip-tag {
  background: rgba(234, 179, 8, 0.15);
  border: 1px solid rgba(234, 179, 8, 0.35);
  color: #facc15;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.vip-diamond {
  font-size: 12px;
}

.ai-tutor-chat-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 10px 12px 6px 12px;
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12.5px;
  font-weight: 700;
  color: #e2e8f0;
}

.ai-banner-icon {
  font-size: 16px;
}

.ai-studio-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin: 0 12px 8px 12px;
  padding: 5px 8px;
  border-radius: 12px;
}

.engine-selector-box-sm {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.ctrl-icon {
  font-size: 13px;
}

.engine-select-sm {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 4px 6px;
  font-size: 11px;
  color: #cbd5e1;
  outline: none;
}

/* User Bubble in Mockup 2 */
.mobile-user-prompt {
  align-self: flex-end;
  background: rgba(37, 99, 235, 0.25) !important;
  border: 1px solid rgba(59, 130, 246, 0.35) !important;
  border-radius: 18px 18px 4px 18px !important;
  padding: 6px 12px !important;
  margin-bottom: 12px !important;
}

.user-bubble-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-bubble-mini-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.user-bubble-text {
  font-size: 13.5px;
  font-weight: 600;
  color: #f1f5f9;
}

/* 2x2 Prompt Grid Cards */
.mobile-ai-prompt-reply {
  background: rgba(18, 25, 42, 0.95) !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  border-radius: 18px 18px 18px 4px !important;
  padding: 12px !important;
}

.ai-prompt-grid-2x2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 12px 0 10px 0;
}

.ai-prompt-card {
  background: rgba(30, 41, 59, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 12px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ai-prompt-card:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

.prompt-card-icon {
  font-size: 26px;
  margin-bottom: 6px;
}

.prompt-card-title {
  font-size: 12px;
  font-weight: 800;
  color: #f8fafc;
  margin-bottom: 4px;
}

.prompt-card-sub {
  font-size: 10px;
  color: #94a3b8;
  line-height: 1.3;
}

/* Mobile Accessory Input Bar */
.ai-mobile-input-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: rgba(11, 15, 25, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 26px;
  margin: 6px 12px 14px 12px;
}

.btn-input-accessory {
  background: transparent;
  border: none;
  color: #94a3b8;
  font-size: 18px;
  padding: 6px;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.btn-input-accessory:hover {
  color: #38bdf8;
}

.mobile-chat-input {
  flex: 1;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 13.5px;
  outline: none;
  padding: 4px 6px;
}

.btn-input-send {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #2563eb;
  border: none;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  transition: transform 0.2s;
}

.btn-input-send:hover {
  transform: scale(1.05);
}

/* Prompt Picker Modal */
.prompt-picker-card {
  width: 92%;
  max-width: 440px;
}

.prompt-version-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 10px;
}

.prompt-version-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.prompt-version-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
}

.prompt-version-tag.tag-en {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

.prompt-version-tag.tag-kh {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.prompt-text-display {
  font-size: 13px;
  color: #e2e8f0;
  line-height: 1.5;
  background: rgba(0, 0, 0, 0.3);
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.prompt-action-btns {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* ===================================================
   SCHOOL MANAGEMENT DASHBOARD (ADMIN SUITE) STYLES
=================================================== */

.admin-portal-header {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.95), rgba(15, 23, 42, 0.95));
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: var(--radius-lg, 16px);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

.admin-portal-header::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25), transparent 70%);
  pointer-events: none;
}

.admin-portal-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 11.5px;
  font-weight: 700;
  color: #a5b4fc;
  margin-bottom: 10px;
}

.admin-portal-badge .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.admin-portal-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.admin-portal-title {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin: 0;
  font-family: var(--font-khmer-moul, var(--font-khmer));
  line-height: 1.4;
}

.admin-portal-sub {
  font-size: 13px;
  color: #94a3b8;
  margin-top: 4px;
}

.admin-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Sub-Navigation Pills */
.admin-nav-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 20px;
  scrollbar-width: thin;
}

.admin-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 12px;
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-khmer, sans-serif);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.admin-tab-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.4);
  color: #fff;
  transform: translateY(-1px);
}

.admin-tab-btn.active {
  background: linear-gradient(135deg, #4f46e5, #3b82f6);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
}

/* Subpanel Visibility */
.admin-subpanel {
  display: none;
  animation: fadeInPane 0.25s ease-out;
}

.admin-subpanel.active {
  display: block;
}

@keyframes fadeInPane {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 6 High-End Stat Cards */
.admin-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
}

.admin-stat-card {
  padding: 18px;
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.admin-stat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.35);
}

.stat-cyan {
  border-top: 3px solid #06b6d4;
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.12), rgba(15, 23, 42, 0.9));
}
.stat-gold {
  border-top: 3px solid #eab308;
  background: linear-gradient(180deg, rgba(234, 179, 8, 0.12), rgba(15, 23, 42, 0.9));
}
.stat-slate {
  border-top: 3px solid #94a3b8;
  background: linear-gradient(180deg, rgba(148, 163, 184, 0.12), rgba(15, 23, 42, 0.9));
}
.stat-purple {
  border-top: 3px solid #a855f7;
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(15, 23, 42, 0.9));
}
.stat-emerald {
  border-top: 3px solid #10b981;
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(15, 23, 42, 0.9));
}
.stat-amber {
  border-top: 3px solid #f59e0b;
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(15, 23, 42, 0.9));
}

.stat-card-icon {
  font-size: 26px;
  margin-bottom: 8px;
}

.stat-card-val {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  font-family: var(--font-english, monospace);
}

.stat-card-lbl {
  font-size: 13px;
  color: #cbd5e1;
  font-weight: 600;
  margin-top: 4px;
}

.stat-card-foot {
  font-size: 11px;
  color: #94a3b8;
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Quick Actions Bar */
.admin-quick-actions-bar {
  padding: 16px 20px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.admin-quick-btn-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Section Box & Headers */
.admin-section-box {
  padding: 20px;
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.section-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* Filters & Search */
.admin-filter-bar {
  padding: 16px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.admin-search-input-wrap {
  position: relative;
  width: 100%;
}

.admin-search-input-wrap .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 15px;
  color: #94a3b8;
}

.admin-input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border-radius: 10px;
  background: rgba(2, 6, 23, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 13.5px;
  font-family: var(--font-khmer, sans-serif);
  outline: none;
  transition: border-color 0.2s;
}

.admin-input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.3);
}

.admin-filters-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.admin-select {
  padding: 8px 14px;
  border-radius: 8px;
  background: rgba(2, 6, 23, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 12.5px;
  font-family: var(--font-khmer, sans-serif);
  outline: none;
  cursor: pointer;
}

.admin-select:focus {
  border-color: #6366f1;
}

/* Tables */
.admin-table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: 10px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
  color: #e2e8f0;
}

.admin-table th {
  background: rgba(30, 41, 59, 0.8);
  padding: 12px 14px;
  font-weight: 700;
  color: #94a3b8;
  font-size: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  white-space: nowrap;
}

.admin-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  vertical-align: middle;
}

.admin-table tr:hover td {
  background: rgba(99, 102, 241, 0.08);
}

.student-table-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.student-table-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.student-name-main {
  font-weight: 700;
  color: #fff;
}

.student-name-sub {
  font-size: 11px;
  color: #94a3b8;
}

.badge-vip {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 9999px;
  background: rgba(234, 179, 8, 0.15);
  border: 1px solid rgba(234, 179, 8, 0.4);
  color: #facc15;
  font-size: 11px;
  font-weight: 700;
}

.badge-free {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 9999px;
  background: rgba(148, 163, 184, 0.15);
  border: 1px solid rgba(148, 163, 184, 0.3);
  color: #cbd5e1;
  font-size: 11px;
}

.badge-level {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  font-size: 11.5px;
  font-weight: 600;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 640px) {
  .form-grid-2 {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .admin-portal-header {
    padding: 16px;
  }
  .admin-portal-title {
    font-size: 18px;
  }
  .admin-stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =========================================================
   NEW AESTHETIC & INTERACTION ENHANCEMENTS
   ========================================================= */

/* 1. Student Table Avatar Img */
.student-table-avatar-img {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  object-fit: cover;
  border: 1.5px solid rgba(99, 102, 241, 0.45);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  flex-shrink: 0;
  background: #1e293b;
}

/* 2. Receipts Verification & Thumbnail */
.receipt-thumb-wrap {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  overflow: hidden;
  border: 1.5px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  background: rgba(15, 23, 42, 0.7);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.receipt-thumb-wrap:hover {
  border-color: #38bdf8;
  transform: scale(1.12);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.45);
}
.receipt-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.receipt-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
  font-size: 13px;
  color: #fff;
}
.receipt-thumb-wrap:hover .receipt-thumb-overlay {
  opacity: 1;
}

/* 3. Receipts Lightbox Modal */
.lightbox-modal-card {
  max-width: 620px;
  width: 95%;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}
.lightbox-image-container {
  max-height: 60vh;
  min-height: 220px;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #040711;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.lightbox-img {
  max-width: 100%;
  max-height: 56vh;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.8);
  transition: transform 0.3s ease;
}
.lightbox-img:hover {
  transform: scale(1.02);
}

/* 4. Lesson Sticky Reading Progress Bar */
.lesson-reading-progress {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.06);
  z-index: 60;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 10px;
}
.lesson-reading-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #6366f1 0%, #06b6d4 50%, #10b981 100%);
  border-radius: 4px;
  transition: width 0.12s ease-out;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.8);
}

/* 5. Animated Audio Waveform Equalizer */
.audio-waveform-bars {
  display: flex;
  align-items: flex-end;
  gap: 3.5px;
  height: 26px;
  padding: 2px 8px;
  margin-right: 6px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.wave-bar {
  width: 3.5px;
  height: 4px;
  background: #475569;
  border-radius: 3px;
  transition: height 0.2s ease, background-color 0.2s ease;
}
.audio-waveform-bars.playing .wave-bar {
  animation: waveEqualizerDance 0.75s ease-in-out infinite alternate;
  background: linear-gradient(180deg, #38bdf8, #818cf8);
}
.audio-waveform-bars.playing .wave-bar:nth-child(1) { animation-delay: 0.05s; }
.audio-waveform-bars.playing .wave-bar:nth-child(2) { animation-delay: 0.25s; }
.audio-waveform-bars.playing .wave-bar:nth-child(3) { animation-delay: 0.12s; }
.audio-waveform-bars.playing .wave-bar:nth-child(4) { animation-delay: 0.38s; }
.audio-waveform-bars.playing .wave-bar:nth-child(5) { animation-delay: 0.18s; }
.audio-waveform-bars.playing .wave-bar:nth-child(6) { animation-delay: 0.32s; }
.audio-waveform-bars.playing .wave-bar:nth-child(7) { animation-delay: 0.1s; }
.audio-waveform-bars.playing .wave-bar:nth-child(8) { animation-delay: 0.28s; }

@keyframes waveEqualizerDance {
  0% {
    height: 4px;
    opacity: 0.45;
  }
  50% {
    height: 18px;
    opacity: 0.85;
  }
  100% {
    height: 24px;
    opacity: 1;
    filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.8));
  }
}



/* 7. VIP Lesson Lock Badge & Card Styles */
.lesson-badge-vip-lock {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
  font-size: 11px;
  font-weight: 700;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.25);
  letter-spacing: 0.3px;
}
.mobile-lesson-card.vip-locked {
  border-color: rgba(245, 158, 11, 0.3) !important;
  background: rgba(15, 23, 42, 0.75) !important;
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
}
.mobile-lesson-card.vip-locked:hover {
  border-color: #fbbf24 !important;
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.25) !important;
  transform: translateY(-2px);
}

/* ====================================================
   DICTIONARY & TRANSLATION MODAL STYLING
   ==================================================== */
.dictionary-modal-card {
  max-width: 520px;
  width: 95%;
  border-radius: 20px;
  overflow: hidden;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(56, 189, 248, 0.25);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.dict-modal-tabs {
  display: flex;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 4px 8px;
  gap: 6px;
}

.dict-tab-btn {
  flex: 1;
  padding: 8px 10px;
  border-radius: 10px;
  background: transparent;
  border: none;
  color: #94a3b8;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.dict-tab-btn.active {
  background: rgba(56, 189, 248, 0.2);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.4);
}

.dict-pane {
  display: block;
}

.dict-pane.hidden {
  display: none !important;
}

.dict-vocab-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all 0.15s ease;
}

.dict-vocab-item:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.25);
}

.dict-vocab-en {
  font-weight: 700;
  color: #38bdf8;
  font-size: 14px;
}

.dict-vocab-kh {
  color: #cbd5e1;
  font-size: 13px;
  margin-left: 8px;
}

/* ====================================================
   DICTIONARY TAB FULL-PAGE STYLES (Ultra-Modern Interactive Console)
   ==================================================== */
.dict-page-nav-tabs {
  display: flex;
  background: rgba(10, 16, 32, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 5px;
  gap: 8px;
  margin-bottom: 18px;
  overflow-x: auto;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.dict-page-tab-btn {
  flex: 1;
  min-width: 140px;
  padding: 11px 16px;
  border-radius: 12px;
  background: transparent;
  border: 1px solid transparent;
  color: #94a3b8;
  font-family: var(--font-khmer, sans-serif);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  user-select: none;
}

.dict-page-tab-btn:hover {
  color: #f1f5f9;
  background: rgba(255, 255, 255, 0.05);
}

.dict-page-tab-btn.active {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.3) 0%, rgba(59, 130, 246, 0.25) 100%);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.5);
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.dict-section-content {
  display: block;
  animation: modernTabSlideFade 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.dict-section-content.hidden {
  display: none !important;
}

.chip-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #cbd5e1;
  font-size: 11.5px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
}

.chip-btn:hover {
  background: rgba(56, 189, 248, 0.22);
  border-color: rgba(56, 189, 248, 0.5);
  color: #38bdf8;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}

.chip-btn:active {
  transform: scale(0.95);
}

/* Result Box Cyberpunk Glow */
.dict-page-result-card {
  background: radial-gradient(120% 120% at 20% 20%, rgba(6, 182, 212, 0.14) 0%, rgba(10, 16, 32, 0.95) 75%);
  border: 1.5px solid rgba(56, 189, 248, 0.45);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.65), 0 0 25px rgba(56, 189, 248, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  animation: modernTabSlideFade 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.dict-page-result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, #06b6d4, #3b82f6, #8b5cf6, #10b981);
}

.dict-vocab-modern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 10px;
}

.dict-vocab-card-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.68);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
}

.dict-vocab-card-item:hover {
  background: rgba(30, 41, 59, 0.85);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.45), 0 0 18px rgba(56, 189, 248, 0.18);
}

.dict-vocab-card-en {
  font-weight: 700;
  color: #38bdf8;
  font-size: 14.5px;
  letter-spacing: 0.2px;
  font-family: var(--font-english, sans-serif);
}

.dict-vocab-card-kh {
  color: #e2e8f0;
  font-size: 13.5px;
  margin-top: 3px;
  font-family: var(--font-khmer, sans-serif);
}

/* Tab Panes Ultra Smooth Fluid Transitions */
.tab-pane.active {
  animation: modernTabSlideFade 0.28s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modernTabSlideFade {
  0% {
    opacity: 0;
    transform: translateY(6px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
/* ====================================================
   THEME SELECTOR MODAL & OS STYLES (iOS 18, Android 15, etc.)
   ==================================================== */
.theme-selector-modal-card {
  width: 95%;
  max-width: 580px;
  border-radius: 24px;
  overflow: hidden;
  background: rgba(13, 19, 33, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.85), 0 0 30px rgba(56, 189, 248, 0.15);
}

.theme-card-option {
  background: rgba(18, 25, 43, 0.7);
  border: 1.5px solid rgba(255, 255, 255, 0.09);
  border-radius: 18px;
  padding: 12px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.theme-card-option:hover {
  transform: translateY(-3px) scale(1.01);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 20px rgba(56, 189, 248, 0.2);
  background: rgba(25, 36, 62, 0.85);
}

.theme-card-option.active {
  border-color: #38bdf8 !important;
  background: rgba(14, 165, 233, 0.12) !important;
  box-shadow: 0 8px 30px rgba(14, 165, 233, 0.3), inset 0 0 15px rgba(56, 189, 248, 0.15);
}

.theme-card-preview {
  height: 64px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 8px 10px;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.15);
}

.theme-card-preview.ios-preview {
  background: radial-gradient(circle at 10% 20%, #1c1c1e 0%, #000000 100%);
  border: 0.5px solid rgba(255, 255, 255, 0.2);
}

.theme-card-preview.android-preview {
  background: radial-gradient(circle at 10% 20%, #1e1f25 0%, #111318 100%);
  border: 1px solid rgba(142, 145, 153, 0.25);
}

.theme-card-preview.oled-preview {
  background: radial-gradient(circle at 10% 20%, #0f172a 0%, #030712 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.theme-card-preview.gold-preview {
  background: radial-gradient(circle at 10% 20%, #20170a 0%, #08080a 100%);
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.theme-card-preview.matrix-preview {
  background: radial-gradient(circle at 10% 20%, #061910 0%, #040806 100%);
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.theme-card-preview.daylight-preview {
  background: radial-gradient(circle at 10% 20%, #ffffff 0%, #f1f5f9 100%);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.theme-preview-dots {
  display: flex;
  align-items: center;
  gap: 5px;
}

.preview-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-blue { background: #007aff; box-shadow: 0 0 6px #007aff; }
.dot-purple { background: #af52de; }
.dot-cyan { background: #32ade6; box-shadow: 0 0 6px #32ade6; }
.dot-tonal-blue { background: #a8c7fa; box-shadow: 0 0 6px #a8c7fa; }
.dot-tonal-mint { background: #7adaa2; }
.dot-tonal-lilac { background: #d0bcff; }
.dot-indigo { background: #4f46e5; }
.dot-pink { background: #ec4899; }
.dot-gold { background: #fbbf24; box-shadow: 0 0 6px #fbbf24; }
.dot-amber { background: #f59e0b; }
.dot-gold-light { background: #fef3c7; }
.dot-matrix { background: #10b981; box-shadow: 0 0 6px #10b981; }
.dot-emerald { background: #00ff88; }
.dot-teal { background: #06b6d4; }
.dot-sun { background: #f59e0b; }
.dot-sky { background: #0284c7; }
.dot-slate { background: #475569; }

.theme-preview-glass-pill {
  align-self: flex-start;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 10px;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 0.5px solid rgba(255, 255, 255, 0.15);
}

.daylight-preview .theme-preview-glass-pill {
  background: rgba(0, 0, 0, 0.08);
  color: #0f172a;
  border-color: rgba(0, 0, 0, 0.12);
}

.theme-card-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.theme-card-desc {
  font-size: 11.5px;
  color: #94a3b8;
  line-height: 1.4;
  font-family: var(--font-khmer, sans-serif);
}

.theme-badge-os {
  font-size: 10px;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 6px;
  letter-spacing: 0.2px;
}

.badge-ios {
  background: rgba(0, 122, 255, 0.2);
  color: #5ac8fa;
  border: 1px solid rgba(0, 122, 255, 0.4);
}

.badge-android {
  background: rgba(168, 199, 250, 0.18);
  color: #a8c7fa;
  border: 1px solid rgba(168, 199, 250, 0.4);
}

.badge-oled {
  background: rgba(56, 189, 248, 0.18);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.4);
}

.badge-gold {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.badge-matrix {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.badge-day {
  background: rgba(241, 245, 249, 0.2);
  color: #f8fafc;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.theme-active-indicator {
  margin-top: 4px;
}

.indicator-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 10.5px;
  font-weight: 700;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.15);
  padding: 2px 8px;
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.35);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.2);
}

/* ==========================================================================
   DEVICE MODE SYSTEM: PHONE MODE VS DESKTOP MODE
   ========================================================================== */

/* 1. Common Switcher Controls */
.device-mode-btn {
  position: relative;
  font-size: 16px !important;
}

.device-mode-btn.active-desktop {
  border-color: rgba(56, 189, 248, 0.6) !important;
  background: rgba(56, 189, 248, 0.2) !important;
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.4) !important;
}

.device-mode-setting-box {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 12px;
  margin-bottom: 10px;
}

.device-mode-pill-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 6px;
}

.btn-device-mode {
  padding: 10px 8px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  font-size: 11.5px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-device-mode:hover {
  background: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.35);
}

.btn-device-mode.active {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.35), rgba(37, 99, 235, 0.35));
  border-color: #38bdf8;
  color: #ffffff;
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.3);
}

/* 2. Phone Mode (Centered Smartphone Frame) */
body.mode-phone {
  min-width: unset !important;
  width: 100% !important;
  overflow-x: hidden;
}

body.mode-phone .app-container {
  max-width: 480px !important;
  min-width: unset !important;
  margin: 0 auto !important;
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.85) !important;
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  overflow-x: hidden;
}

body.mode-phone .main-content {
  max-width: 100% !important;
  min-width: unset !important;
  padding: 12px 14px 95px 14px !important;
}

body.mode-phone .mobile-bottom-nav {
  max-width: 520px !important;
  min-width: unset !important;
}

/* 3. Desktop Mode (Full-Width Responsive Architecture & Zoom Support) */
body.mode-desktop {
  min-width: 1100px !important;
  width: 100% !important;
  overflow-x: auto !important;
}

body.mode-desktop .app-container {
  max-width: 1440px !important;
  min-width: 1100px !important;
  width: 100% !important;
  margin: 0 auto !important;
  box-shadow: none !important;
  overflow-x: visible !important;
  border-left: 1px solid rgba(255, 255, 255, 0.05);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

body.mode-desktop .main-content {
  max-width: 1380px !important;
  min-width: 1060px !important;
  padding: 22px 32px 110px 32px !important;
  overflow-x: visible !important;
}

body.mode-desktop .mobile-app-header {
  min-width: 1100px !important;
  max-width: 1440px !important;
  margin: 0 auto !important;
  padding: 12px 32px;
}

body.mode-desktop .header-brand-title {
  font-size: 19px;
}

body.mode-desktop .header-brand-sub {
  font-size: 12.5px;
}

/* Desktop Hero Card */
body.mode-desktop .mobile-hero-card {
  grid-template-columns: 1fr 200px;
  padding: 28px 36px;
  border-radius: 28px;
}

body.mode-desktop .mobile-hero-title {
  font-size: 26px;
  margin-bottom: 8px;
}

body.mode-desktop .mobile-hero-subtitle {
  font-size: 14px;
  margin-bottom: 18px;
}

body.mode-desktop .mobile-hero-actions {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 12px;
}

body.mode-desktop .mobile-hero-actions button {
  padding: 10px 22px;
  font-size: 13px;
}

body.mode-desktop .hero-illustration-frame {
  width: 180px;
  height: 180px;
  border-radius: 24px;
}

/* Desktop Dashboard Grids */
body.mode-desktop .dashboard-compact-2x2-grid {
  grid-template-columns: repeat(4, 1fr) !important;
  gap: 16px;
}

body.mode-desktop .dash-stat-compact-card {
  padding: 18px 16px;
}

body.mode-desktop .dash-pills-row {
  grid-template-columns: repeat(4, 1fr) !important;
  gap: 14px;
}

body.mode-desktop .dash-action-pill {
  padding: 12px 18px;
  font-size: 13px;
}

/* Desktop Course Categories Carousel */
body.mode-desktop .categories-carousel-scroll {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  overflow-x: visible;
  scroll-snap-type: none;
}

body.mode-desktop .category-card-item {
  flex: none;
  width: 100%;
}

body.mode-desktop .category-card-thumb {
  height: 110px;
}

/* Desktop Course Level Switcher & Weeks */
body.mode-desktop .course-level-switcher-5 {
  grid-template-columns: repeat(5, 1fr) !important;
  gap: 12px;
}

body.mode-desktop .course-level-btn-pill {
  padding: 12px 16px;
  font-size: 13.5px;
}

body.mode-desktop .beginner-weeks-container,
body.mode-desktop .elementary-weeks-container,
body.mode-desktop .curriculum-weeks-container {
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)) !important;
  gap: 18px !important;
}

body.mode-desktop .week-accordion-card,
body.mode-desktop .week-card {
  margin-bottom: 0 !important;
}

/* Desktop Lesson Layout Side-by-Side */
body.mode-desktop .lesson-layout {
  display: grid !important;
  grid-template-columns: 1fr 380px !important;
  gap: 24px !important;
  align-items: start !important;
}

body.mode-desktop .ai-tutor-card {
  position: sticky !important;
  top: 80px !important;
  height: calc(100vh - 120px) !important;
  display: flex !important;
  flex-direction: column !important;
}

body.mode-desktop .ai-tutor-card .chat-messages {
  flex: 1 !important;
  overflow-y: auto !important;
}

/* Desktop AI Studio Tab */
body.mode-desktop .ai-studio-container {
  max-width: 960px;
  margin: 0 auto;
  height: calc(100vh - 150px);
  display: flex;
  flex-direction: column;
}

body.mode-desktop .ai-studio-chat-box {
  flex: 1;
}

/* Desktop VIP Plans Grid */
body.mode-desktop .vip-plans-grid {
  grid-template-columns: repeat(4, 1fr) !important;
  gap: 20px !important;
}

/* Desktop Practice Modules & Cards */
body.mode-desktop .practice-modules-grid,
body.mode-desktop .vocab-categories-grid,
body.mode-desktop .grammar-topics-grid,
body.mode-desktop .dialogue-list-grid {
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)) !important;
  gap: 16px !important;
}

/* Desktop Bottom Navigation Bar */
body.mode-desktop .mobile-bottom-nav {
  max-width: 860px !important;
  padding: 8px 18px !important;
  bottom: 18px !important;
  border-radius: 36px !important;
}

body.mode-desktop .mobile-bottom-nav .m-nav-item {
  padding: 6px 14px !important;
  font-size: 11px !important;
}

body.mode-desktop .mobile-bottom-nav .m-nav-item .m-icon {
  font-size: 19px !important;
}

/* 4. Floating Zoom Widget in Desktop Mode */
.desktop-zoom-float {
  position: fixed;
  bottom: 84px;
  right: 18px;
  z-index: 1050;
  display: flex;
  align-items: center;
  background: rgba(15, 23, 42, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(56, 189, 248, 0.4);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.8), 0 0 18px rgba(56, 189, 248, 0.25);
  border-radius: 9999px;
  padding: 5px 8px;
  gap: 6px;
  transition: all 0.25s ease;
}

.desktop-zoom-float.hidden {
  display: none !important;
}

.desktop-zoom-float .zoom-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #f8fafc;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.desktop-zoom-float .zoom-btn:hover {
  background: rgba(56, 189, 248, 0.28);
  border-color: #38bdf8;
  transform: scale(1.12);
}

.desktop-zoom-float .zoom-btn:active {
  transform: scale(0.94);
}

.desktop-zoom-float .zoom-val-btn {
  padding: 4px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #38bdf8;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  font-family: monospace;
  transition: all 0.2s;
}

.desktop-zoom-float .zoom-val-btn:hover {
  background: rgba(56, 189, 248, 0.2);
  border-color: #38bdf8;
}