/* ============================================================
   KỸ NĂNG SỐNG — Main CSS
   Design: Premium gamified learning platform
   ============================================================ */

/* ─── Variables ─────────────────────────────────────────── */
:root, [data-theme="dark"] {
  /* Backgrounds — slightly warmer, more layered */
  --bg-main:  #0a0d1a;
  --bg-card:  #111427;
  --bg-card2: #161b32;
  --bg-input: #1a203a;
  --bg-nav:   rgba(14,17,34,0.95);
  --bg-modal: rgba(4,6,18,0.90);

  /* Brand */
  --c-primary:       #7c4dff;
  --c-primary-hover: #651fff;
  --c-primary-light: #b39ddb;
  --c-accent:        #40c4ff;

  /* Gamification */
  --c-gold:   #ffd740;
  --c-green:  #00e5a0;
  --c-red:    #ff4757;
  --c-pink:   #ff6b9d;
  --c-orange: #ff8c00;

  /* Text — high contrast, readable */
  --c-text:  #f0f2ff;
  --c-text2: #c5cadf;
  --c-muted: #7a87b5;

  /* Borders */
  --c-border:  #1e2545;
  --c-border2: #283060;

  /* Effects */
  --shadow:    0 8px 32px rgba(0,0,0,0.45);
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.28);

  /* Misc */
  --radius:    20px;
  --radius-sm: 12px;
  --font:      'Nunito', system-ui, -apple-system, sans-serif;
  --font-head: 'Baloo 2', 'Nunito', cursive;
  --nav-h:     60px;
}

/* ─── Light Theme — stronger contrast, not washed out ───── */
[data-theme="light"] {
  /* Backgrounds — warm white with subtle purple tint */
  --bg-main:  #f0edf8;
  --bg-card:  #ffffff;
  --bg-card2: #f5f2fd;
  --bg-input: #ece6f8;
  --bg-nav:   rgba(255,255,255,0.97);
  --bg-modal: rgba(20,10,50,0.55);

  /* Text — very dark for readability */
  --c-text:  #12102a;
  --c-text2: #3d3760;
  --c-muted: #7a72a0;

  /* Borders — visible but not harsh */
  --c-border:  #d8d0ef;
  --c-border2: #c4b8e8;

  /* Effects */
  --shadow:    0 8px 32px rgba(100,80,200,0.12);
  --shadow-sm: 0 2px 10px rgba(100,80,200,0.09);
}


/* ─── Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-tap-highlight-color: transparent; }
body {
  font-family: var(--font);
  background: var(--bg-main);
  color: var(--c-text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: var(--font); cursor: pointer; border: none; outline: none; background: none; }
input, textarea { font-family: var(--font); }

/* ─── Typography ────────────────────────────────────────── */
h1 { font-size: 42px; }
h2 { font-size: 34px; }
h3 { font-size: 28px; }
h1, h2, h3, h4, h5 { font-family: var(--font-head); color: var(--c-text); line-height: 1.25; }

/* ─── Utility ───────────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* ─── Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 28px; border-radius: 14px;
  font-weight: 800; font-size: 17px;
  transition: all 0.25s cubic-bezier(.4,0,.2,1);
  cursor: pointer; position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff; border: none;
  box-shadow: 0 4px 18px rgba(124,77,255,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(124,77,255,0.45); }
.btn-outline {
  background: transparent; color: var(--c-primary);
  border: 2px solid var(--c-primary);
}
.btn-outline:hover { background: var(--c-primary); color: #fff; }
.btn-gold {
  background: linear-gradient(135deg, var(--c-gold), var(--c-orange));
  color: #000; border: none; font-weight: 800;
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,215,64,0.35); }
.btn-sm { padding: 10px 20px; font-size: 14px; border-radius: 10px; }

/* ─── Screens (SPA) ─────────────────────────────────────── */
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; animation: fadeIn 0.35s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

/* ─── Navbar ────────────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--bg-nav); backdrop-filter: blur(16px);
  border-bottom: 2px solid var(--c-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px; height: var(--nav-h);
}
.navbar .logo-text {
  font-family: var(--font-head); font-size: 26px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
  letter-spacing: 0.5px;
}
.nav-right { display: flex; align-items: center; gap: 10px; }
.nav-stars {
  background: linear-gradient(135deg, var(--c-gold)22, var(--c-orange)22);
  border: 1px solid var(--c-gold)33; border-radius: 20px;
  padding: 6px 14px; font-size: 15px; font-weight: 800; color: var(--c-gold);
}
.nav-avatar {
  width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 16px; color: #fff; cursor: pointer;
}

/* ─── Bottom Nav ────────────────────────────────────────── */
.bottom-nav {
  position: fixed; bottom: 10px; left: 16px; right: 16px; z-index: 100;
  background: var(--bg-nav); backdrop-filter: blur(28px) saturate(180%);
  border: 1.5px solid var(--c-border); border-radius: 20px;
  display: flex; justify-content: space-around; align-items: center;
  padding: 4px 10px; padding-bottom: max(6px, env(safe-area-inset-bottom));
  box-shadow: 0 8px 30px rgba(0,0,0,0.35), 0 0 15px rgba(124,77,255,0.1);
}
.bnav-item {
  flex: 0 1 70px; display: flex; flex-direction: column; align-items: center;
  gap: 2px; cursor: pointer; padding: 6px; border-radius: 12px;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 10.5px; font-weight: 800; color: var(--c-muted);
}
.bnav-item.active { 
  color: var(--c-primary);
  background: rgba(124, 77, 255, 0.08);
  box-shadow: inset 0 0 10px rgba(124,77,255,0.1);
}
.bnav-item .bnav-icon { 
  font-size: 26px; 
  transition: transform .25s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex; align-items: center; justify-content: center;
}
.bnav-item.active .bnav-icon { 
  transform: translateY(-4px) scale(1.1);
  text-shadow: 0 0 12px rgba(124,77,255,0.5);
}
.bnav-item span { opacity: 0.8; }
.bnav-item.active span { opacity: 1; }

/* ─── Toast ─────────────────────────────────────────────── */
.toast-container {
  position: fixed; top: 66px; right: 16px; z-index: 9999;
  display: flex; flex-direction: column; gap: 8px;
}
.toast {
  background: var(--bg-card2); border: 1.5px solid var(--c-border);
  border-radius: 16px; padding: 16px 24px;
  display: flex; align-items: center; gap: 12px;
  font-size: 16px; min-width: 280px; max-width: 420px;
  box-shadow: var(--shadow); animation: slideInRight 0.35s ease;
}
.toast.success { border-color: var(--c-green); }
.toast.error   { border-color: var(--c-red); }
@keyframes slideInRight { from { opacity: 0; transform: translateX(60px); } to { opacity: 1; transform: translateX(0); } }

/* ─── Spinner / Loading ─────────────────────────────────── */
.spinner {
  width: 36px; height: 36px; margin: 40px auto;
  border: 3px solid var(--c-border);
  border-top-color: var(--c-primary);
  border-radius: 50%; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state { text-align: center; padding: 48px 16px; color: var(--c-muted); }
.empty-icon { font-size: 48px; margin-bottom: 12px; }

/* ─── Settings Panel ────────────────────────────────────── */
.settings-panel {
  position: fixed; top: 0; right: -360px; bottom: 0; z-index: 200;
  width: 320px; max-width: 85vw;
  background: var(--bg-card); border-left: 1px solid var(--c-border);
  box-shadow: -12px 0 40px rgba(0,0,0,0.5);
  transition: right 0.35s cubic-bezier(.4,0,.2,1);
  overflow-y: auto; padding: 24px 20px;
}
.settings-panel.open { right: 0; }
.settings-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.settings-title { font-family: var(--font-head); font-size: 20px; color: var(--c-text); }
.settings-close { font-size: 22px; cursor: pointer; color: var(--c-muted); padding: 4px; }
.settings-account {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card2); border-radius: var(--radius-sm); padding: 14px;
  margin-bottom: 20px; border: 1px solid var(--c-border);
}
.settings-avatar-big {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px; color: #fff; flex-shrink: 0;
}
.settings-user-name { font-weight: 700; font-size: 15px; }
.settings-user-email { font-size: 12px; color: var(--c-muted); }
.settings-user-pkg { font-size: 12px; color: var(--c-gold); margin-top: 2px; }
.settings-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 0; border-bottom: 1px solid var(--c-border);
}
.settings-row-label { font-size: 14px; color: var(--c-text2); }
.toggle {
  width: 46px; height: 26px; border-radius: 13px;
  background: var(--c-border2); cursor: pointer; position: relative;
  transition: background 0.3s;
}
.toggle.on { background: var(--c-primary); }
.toggle::after {
  content: ''; position: absolute; top: 3px; left: 3px;
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; transition: transform 0.3s;
}
.toggle.on::after { transform: translateX(20px); }
.settings-btn {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 12px 14px; border-radius: 10px;
  font-size: 14px; color: var(--c-red); cursor: pointer;
  background: var(--c-red)11; border: 1px solid var(--c-red)33;
  margin-top: 16px; font-weight: 700; transition: background 0.2s;
}
.settings-btn:hover { background: var(--c-red)22; }

/* ─── Ripple ────────────────────────────────────────────── */
.ripple-effect {
  position: absolute; border-radius: 50%;
  background: rgba(255,255,255,0.18);
  transform: scale(0); animation: ripple 0.6s ease-out forwards;
  pointer-events: none;
}
@keyframes ripple { to { transform: scale(2.5); opacity: 0; } }
/* ─── Profile & Children UI (Task_024/025) ───────────────── */
.avatar-option {
  flex: 0 0 50px; height: 50px;
  background: var(--bg-input); border: 2px solid var(--c-border);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 24px; cursor: pointer; transition: all 0.2s;
}
.avatar-option:hover { transform: scale(1.1); border-color: var(--c-primary-light); }
.avatar-option.active { border-color: var(--c-primary); background: var(--c-primary)11; transform: scale(1.1); box-shadow: 0 0 15px var(--c-primary)44; }

.child-item:hover { transform: translateX(4px); background: var(--bg-input) !important; cursor: pointer; }

/* Global Error Toast (Task_025) */
.toast.error { border-left: 5px solid var(--c-red); }
.toast.success { border-left: 5px solid var(--c-green); }



@media (max-width: 768px) {
  .settings-panel { width: 100%; right: -100%; border-left: none; }
}
/* ─── Lessons Grid & Cards ───────────────────────────────── */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);   /* mobile: 2 cols */
  gap: 18px; padding: 18px; padding-bottom: 48px;
}
@media (min-width: 640px) {
  .lessons-grid { gap: 24px; padding: 24px; }
}
@media (min-width: 860px) {
  /* Desktop: 3 cols — big, clear, child-friendly */
  .lessons-grid { grid-template-columns: repeat(3, 1fr); gap: 32px; padding: 32px; }
}

.lesson-card {
  background: var(--bg-card); border: 1px solid var(--c-border);
  border-radius: 24px; overflow: hidden;
  cursor: pointer; transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative; display: flex; flex-direction: column;
  box-shadow: var(--shadow-sm);
}
.lesson-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--c-primary);
  box-shadow: 0 20px 40px rgba(0,0,0,0.35), 0 0 20px rgba(124,77,255,0.2);
}
.lesson-card.locked { opacity: 0.6; cursor: default; filter: grayscale(0.2); pointer-events: none; }
.lesson-card.pkg-locked { border-color: var(--c-gold)44; }

.lesson-thumb {
  width: 100%; height: 145px;
  background: linear-gradient(135deg, var(--c1, #7c4dff), var(--c2, #40c4ff));
  display: flex; align-items: center; justify-content: center;
  font-size: 52px; position: relative; overflow: hidden;
  transition: all 0.3s;
}
.lesson-thumb::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 50%;
  background: linear-gradient(to bottom, rgba(255,255,255,0.12), transparent);
  pointer-events: none; z-index: 2;
}
@media (min-width: 640px)  { .lesson-thumb { height: 175px; font-size: 60px; } }
@media (min-width: 860px)  { .lesson-thumb { height: 210px; font-size: 68px; } }

/* Thumbnail image — fills the card cover */
.lesson-thumb-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
  transition: transform 0.4s cubic-bezier(.4,0,.2,1);
  z-index: 0;
}
.lesson-card:hover .lesson-thumb-img { transform: scale(1.06); }

/* Emoji icon — shown when no thumbnail */
.lesson-thumb-icon {
  display: flex; align-items: center; justify-content: center;
  position: relative; z-index: 1;
  font-size: inherit; line-height: 1; pointer-events: none;
}

.lesson-thumb-overlay { position: absolute; inset: 0; background: linear-gradient(to bottom, transparent 45%, rgba(0,0,0,0.38)); z-index: 1; }

.lesson-badge-level {
  position: absolute; top: 12px; left: 12px; z-index: 3;
  background: rgba(0,0,0,0.7); color: #fff; padding: 5px 12px;
  border-radius: 20px; font-size: 13px; font-weight: 800; backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
}
.lesson-pkg-badge {
  position: absolute; top: 12px; right: 12px; z-index: 3;
  border-radius: 20px; padding: 5px 12px; font-size: 12px; font-weight: 900;
  box-shadow: 0 6px 15px rgba(0,0,0,0.4); text-transform: uppercase;
  border: 1.5px solid rgba(255,255,255,0.1);
}
.pkg-cb { background: #00e5a0; color: #000; }
.pkg-nc { background: #40c4ff; color: #000; }
.pkg-kc { background: #ffd740; color: #000; }

.lesson-done-mark {
  position: absolute; top: 0; right: 0; z-index: 3;
  background: var(--c-green); color: #000; width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-bottom-left-radius: 14px; font-size: 16px;
}

.lesson-info { padding: 14px 18px 18px; flex-grow: 1; display: flex; flex-direction: column; }
.lesson-num { font-size: 11px; color: var(--c-muted); font-weight: 700; text-transform: uppercase; margin-bottom: 4px; }
.lesson-title {
  font-size: 18px; font-weight: 800; line-height: 1.35; margin-bottom: 6px;
  color: var(--c-text); flex-grow: 1;
}
@media (min-width: 860px) {
  .lesson-info { padding: 16px 22px 22px; }
  .lesson-title { font-size: 19px; }
  .lesson-num { font-size: 12px; }
}
.lesson-group-tag { font-size: 14px; color: var(--c-primary-light); font-weight: 700; display: flex; align-items: center; gap: 4px; opacity: 0.8; }
.lesson-stars { display: flex; gap: 5px; margin-top: 14px; }
.lesson-stars i { font-size: 16px; color: var(--c-gold); }
.lesson-stars i.empty { color: var(--c-border2); opacity: 0.3; }

.lesson-pkg-lock, .lesson-lock-icon {
  position: absolute; inset: 0; background: rgba(0,0,0,0.65);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  z-index: 5; font-size: 11px; font-weight: 800; color: #fff; gap: 8px;
  backdrop-filter: blur(4px);
}
.lesson-lock-icon i { font-size: 32px; color: rgba(255,255,255,0.4); }

.load-more-container { text-align: center; padding: 24px 0 120px; }
.btn-load-more {
  background: var(--bg-card2); border: 2px solid var(--c-border2); color: var(--c-text);
  padding: 14px 48px; border-radius: 20px; font-weight: 800; transition: all 0.25s;
  font-size: 14px; width: 100%; max-width: 240px;
}
.btn-load-more:hover { 
  background: var(--c-primary); color: #fff; border-color: var(--c-primary);
  transform: translateY(-4px); box-shadow: 0 8px 24px rgba(124, 77, 255, 0.3);
}

/* ─── Lesson Detail Polish ──────────────────────────────── */
.lesson-hero {
  position: relative; width: 100%; height: 280px; overflow: hidden;
  background: linear-gradient(135deg, var(--bg-card), var(--bg-card2));
}
@media (min-width: 768px) {
  .lesson-hero { height: 420px; }
}
.lesson-hero-emoji {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-size: 110px; z-index: 1; animation: float 6s ease-in-out infinite;
}
.lesson-hero-gradient {
  position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, var(--bg-main) 100%); z-index: 2;
}
.lesson-hero-img-tag {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0;
  display: none; /* Shown via JS when available */
}
.lesson-hero-overlay {
  position: absolute; inset: 0; background: rgba(0,0,0,0.25); z-index: 1;
}
.back-btn-lesson {
  position: fixed; top: 16px; left: 16px; z-index: 1000;
  background: rgba(14,17,34,0.65) !important; backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.18) !important;
  color: #fff !important; box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
[data-theme="light"] .back-btn-lesson {
  background: rgba(255,255,255,0.7) !important;
  border-color: rgba(124,77,255,0.2) !important;
  color: var(--c-primary) !important;
}
.lesson-body { padding: 32px 20px 160px; max-width: 900px; margin: 0 auto; }
.lesson-detail-title { font-size: 38px; font-weight: 900; margin-bottom: 12px; line-height: 1.25; text-align: center; }
.lesson-meta { display: flex; justify-content: center; gap: 16px; margin-bottom: 32px; font-size: 15px; color: var(--c-muted); font-weight: 700; flex-wrap: wrap; }
.lesson-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 40px; }
.lesson-stat-item { background: var(--bg-card); border: 1.5px solid var(--c-border); padding: 20px; border-radius: 24px; text-align: center; }
.stat-value { font-size: 30px; font-weight: 900; color: var(--c-gold); margin-bottom: 4px; }
.stat-label { font-size: 14px; color: var(--c-muted); text-transform: uppercase; letter-spacing: 1px; }

.lesson-desc { font-size: 20px; line-height: 1.6; color: var(--c-text2); margin-bottom: 32px; text-align: center; }
.lesson-actions { display: flex; gap: 16px; margin-bottom: 48px; }
.lesson-actions .btn { padding: 18px 32px; font-size: 20px; }

.comments-title { font-size: 24px; font-weight: 900; margin-bottom: 20px; }
.comment-input-row { display: flex; gap: 12px; margin-bottom: 24px; }
.comment-input-row input { 
  flex: 1; padding: 16px 20px; border-radius: 16px; 
  background: var(--bg-input); border: 1.5px solid var(--c-border);
  color: var(--c-text); font-size: 17px;
}
.comment-input-row .btn { width: 56px; height: 56px; padding: 0; justify-content: center; border-radius: 16px; }

/* ─── Group-Specific Highlights (Task_028) ───────────────── */
.lesson-card[data-group="1"] { --c-grp: #7c4dff; }
.lesson-card[data-group="2"] { --c-grp: #1565c0; }
.lesson-card[data-group="3"] { --c-grp: #2e7d32; }
.lesson-card[data-group="4"] { --c-grp: #e65100; }
.lesson-card[data-group="5"] { --c-grp: #880e4f; }
.lesson-card[data-group="6"] { --c-grp: #4a148c; }
.lesson-card[data-group="7"] { --c-grp: #1b5e20; }
.lesson-card[data-group="8"] { --c-grp: #006064; }

.lesson-card:hover { border-color: var(--c-grp, var(--c-primary)); box-shadow: var(--shadow); }
.lesson-card .group-tag { color: var(--c-grp); font-weight: 800; font-size: 11px; }

/* Desktop Navigation - Hide only on small screens */
@media (max-width: 768px) {
  .navbar .logo-text { font-size: 18px; }
  .navbar { padding: 0 15px; }
  .settings-panel { width: 100%; right: -100%; border-left: none; }
}

/* --- Task_032: Streak & Task_034: AI Voice Polish --- */
.nav-streak {
  display: none; /* Controlled by JS */
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: rgba(255, 109, 0, 0.1);
  border-radius: 20px;
  border: 1px solid rgba(255, 109, 0, 0.2);
  cursor: default;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-streak:hover {
  background: rgba(255, 109, 0, 0.2);
  transform: scale(1.05);
}

.msg-speak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-left: 8px;
  background: var(--c-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 10px;
  cursor: pointer;
  transition: all 0.2s;
  vertical-align: middle;
}

.msg-speak-btn:hover {
  transform: scale(1.2);
  box-shadow: 0 0 10px var(--c-primary);
}

.ai-msg.bot {
  position: relative;
}



/* 🚀 Phase 8: MASTERED! 🚀 */

/* ─── Light Mode Specific Overrides ─────────────────────── */
[data-theme="light"] body {
  font-weight: 500;
  -webkit-font-smoothing: subpixel-antialiased;
}

/* Lesson cards in light mode */
[data-theme="light"] .lesson-card {
  box-shadow: 0 2px 16px rgba(100,80,180,0.09);
  border: 1px solid var(--c-border);
}
[data-theme="light"] .lesson-card:hover {
  box-shadow: 0 6px 24px rgba(100,80,180,0.18);
  border-color: var(--c-primary)55;
}
[data-theme="light"] .lesson-title {
  color: #12102a;
  font-weight: 800;
}
[data-theme="light"] .lesson-num,
[data-theme="light"] .lesson-group-tag {
  color: #5a5480;
}

/* Navbar in light mode */
[data-theme="light"] .navbar {
  border-bottom-color: var(--c-border);
  box-shadow: 0 2px 12px rgba(100,80,180,0.08);
}

/* Bottom nav in light mode */
[data-theme="light"] .bottom-nav {
  border-top: 1px solid var(--c-border);
  box-shadow: 0 -4px 20px rgba(100,80,180,0.08);
}
[data-theme="light"] .bnav-item { color: #7a72a0; }
[data-theme="light"] .bnav-item.active { color: var(--c-primary); }

/* Filter chips in light mode */
[data-theme="light"] .filter-chip {
  background: #fff;
  border-color: var(--c-border);
  color: #3d3760;
  box-shadow: 0 1px 4px rgba(100,80,180,0.06);
}
[data-theme="light"] .filter-chip.active,
[data-theme="light"] .filter-chip:hover {
  background: var(--c-primary)12;
  border-color: var(--c-primary);
  color: var(--c-primary);
}

/* Smart review in light mode */
[data-theme="light"] .smart-review-card {
  background: linear-gradient(135deg, var(--c-primary)08, var(--c-accent)05);
  border-color: var(--c-primary)33;
}
[data-theme="light"] .suggested-item {
  background: #fff !important;
  box-shadow: 0 2px 8px rgba(100,80,180,0.08);
}

/* LB items in light mode */
[data-theme="light"] .lb-item {
  background: #fff;
  box-shadow: 0 1px 8px rgba(100,80,180,0.07);
}
[data-theme="light"] .lb-item:hover {
  box-shadow: 0 4px 16px rgba(100,80,180,0.14);
}

/* View buttons in light mode */
[data-theme="light"] .view-btns button {
  background: #fff;
  border-color: var(--c-border);
  color: #3d3760;
}

/* Toast in light mode */
[data-theme="light"] .toast {
  background: #fff;
  border: 1px solid var(--c-border);
  color: #12102a;
  box-shadow: 0 8px 32px rgba(100,80,180,0.18);
}

/* ─── Light Mode: Card & Text Fixes ──────────────────────── */
[data-theme="light"] .lesson-card {
  background: #fff;
  border-color: #e2daf5;
  box-shadow: 0 2px 12px rgba(100,80,180,0.07), 0 1px 4px rgba(100,80,180,0.05);
}
[data-theme="light"] .lesson-card:hover {
  box-shadow: 0 8px 28px rgba(100,80,180,0.15);
  border-color: var(--c-primary)66;
}
[data-theme="light"] .lesson-title { color: #12102a; font-weight: 900; }
[data-theme="light"] .lesson-num { color: #7a72a0; }
[data-theme="light"] .lesson-group-tag { color: var(--c-primary); opacity: 0.85; }
[data-theme="light"] .lesson-stars i.empty { color: #d0c8ea; opacity: 1; }
[data-theme="light"] .lesson-thumb-overlay {
  background: linear-gradient(to bottom, transparent 45%, rgba(0,0,0,0.22));
}

/* Load more button light */
[data-theme="light"] .btn-load-more {
  background: #fff;
  border-color: #d0c8ea;
  color: #3d3760;
  box-shadow: 0 2px 8px rgba(100,80,180,0.07);
}
[data-theme="light"] .btn-load-more:hover {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
  box-shadow: 0 6px 20px rgba(124,77,255,0.3);
}

/* Smart review light */
[data-theme="light"] .smart-review-card {
  background: linear-gradient(135deg, rgba(124,77,255,0.05), rgba(64,196,255,0.03));
  border-color: rgba(124,77,255,0.2);
  box-shadow: 0 2px 16px rgba(124,77,255,0.06);
}
[data-theme="light"] .smart-review-title { color: var(--c-primary); }
[data-theme="light"] .smart-review-msg { color: #3d3760; }
[data-theme="light"] .suggested-item {
  background: #fff;
  border-color: #e2daf5;
  box-shadow: 0 2px 8px rgba(100,80,180,0.07);
  color: #12102a;
}

/* Filter chips light */
[data-theme="light"] .filter-chip {
  background: #fff;
  border: 1.5px solid #e2daf5;
  color: #3d3760;
  box-shadow: 0 1px 4px rgba(100,80,180,0.05);
}
[data-theme="light"] .filter-chip:hover,
[data-theme="light"] .filter-chip.active {
  background: rgba(124,77,255,0.08);
  border-color: var(--c-primary);
  color: var(--c-primary);
}

/* Progress bar track light */
[data-theme="light"] .dash-progress-bar { background: #e2daf5; }

/* View buttons light */
[data-theme="light"] .view-btns button {
  background: #fff;
  border-color: #e2daf5;
  color: #3d3760;
}
[data-theme="light"] .view-btns button.active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}

/* ─── Light Mode: Locked card thumbnail fix ──────────────── */
[data-theme="light"] .lesson-card.locked .lesson-thumb,
[data-theme="light"] .lesson-card.pkg-locked .lesson-thumb {
  background: linear-gradient(135deg, #c9c0e8, #b8cfe8) !important;
}
[data-theme="light"] .lesson-pkg-lock,
[data-theme="light"] .lesson-lock-icon {
  background: rgba(60,40,120,0.45) !important;
  backdrop-filter: blur(8px);
}
[data-theme="light"] .lesson-badge-level {
  background: rgba(255,255,255,0.75);
  color: #3d3760;
  border-color: rgba(100,80,180,0.15);
}

/* Header in light mode */
[data-theme="light"] .dash-header-section {
  background: linear-gradient(180deg, rgba(124,77,255,0.06) 0%, transparent 100%);
}
[data-theme="light"] #dash-greeting { color: #12102a; }
[data-theme="light"] #dash-progress-text { color: #5a5480; }
[data-theme="light"] .dash-progress-bar { background: #e2daf5; }
[data-theme="light"] .dash-progress-fill {
  box-shadow: 0 0 12px rgba(124,77,255,0.3);
}

/* ─── Grade Filter Bar ───────────────────────────────────── */
.grade-filter-wrap {
  padding: 12px 16px 0;
  position: relative;
}
.grade-filter-wrap::after {          /* fade-right scroll hint */
  content: '';
  position: absolute; right: 0; top: 12px;
  width: 40px; height: 100%;
  background: linear-gradient(to right, transparent, var(--bg-main));
  pointer-events: none;
}
.grade-filter-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 4px;
}
.grade-filter-bar::-webkit-scrollbar { display: none; }

.grade-pill {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 28px;
  border: 1.5px solid var(--c-border2);
  background: var(--bg-card);
  color: var(--c-text2);
  font-size: 15px;
  font-weight: 800;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.22s cubic-bezier(.4,0,.2,1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.grade-pill:hover {
  border-color: var(--c-primary)88;
  color: var(--c-primary);
  background: var(--c-primary)0d;
  transform: translateY(-1px);
}
.grade-pill.active {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 14px rgba(124,77,255,0.35);
}
.grade-pill-num {
  font-weight: 800;
  font-size: 12px;
}
.grade-pill-bar {
  display: inline-block;
  width: 32px; height: 4px;
  background: rgba(255,255,255,0.25);
  border-radius: 4px;
  overflow: hidden;
}
.grade-pill-fill {
  display: block;
  height: 100%;
  background: rgba(255,255,255,0.9);
  border-radius: 4px;
  transition: width 0.4s ease;
}
.grade-pill:not(.active) .grade-pill-bar {
  background: var(--c-border2);
}
.grade-pill:not(.active) .grade-pill-fill {
  background: var(--c-primary);
}
.grade-pill-pct {
  font-size: 10px;
  font-weight: 700;
  opacity: 0.85;
}
.grade-pill:first-child .grade-pill-bar,
.grade-pill:first-child .grade-pill-pct { display: none; }

/* Light mode grade pills */
[data-theme="light"] .grade-pill {
  background: #fff;
  border-color: #d8d0ef;
  color: #5a5480;
}
[data-theme="light"] .grade-pill:hover {
  background: rgba(124,77,255,0.06);
  border-color: var(--c-primary)66;
  color: var(--c-primary);
}
[data-theme="light"] .grade-pill.active {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 12px rgba(124,77,255,0.3);
}

.settings-version {
  margin-top: auto; padding: 20px 0 10px;
  display: flex; justify-content: center;
}
.settings-version span {
  display: inline-block;
  padding: 4px 12px; border-radius: 20px;
  background: rgba(124, 77, 255, 0.08); 
  border: 1px solid rgba(124, 77, 255, 0.15);
  font-size: 11px; color: var(--c-primary); 
  font-weight: 800; font-family: var(--font-head);
  letter-spacing: 0.5px; opacity: 0.8;
}

/* ─── Scroll-to-top FAB ──────────────────────────────────── */
#fab-scroll-top {
  position: fixed;
  bottom: calc(80px + env(safe-area-inset-bottom, 0px) + 16px);
  left: 18px;          /* left side — AI bear is on the right */
  z-index: 95;
  width: 54px; height: 54px;
  border-radius: 50%;
  background: rgba(124,77,255,0.9);
  backdrop-filter: blur(8px);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.15);
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(124,77,255,0.4);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transform: translateY(10px) scale(0.85);
  transition: opacity 0.22s, transform 0.22s cubic-bezier(0.34,1.56,0.64,1);
  pointer-events: none;
}
#fab-scroll-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
#fab-scroll-top:hover {
  background: rgba(64,196,255,0.92);
  transform: translateY(-2px) scale(1.08);
}
#fab-scroll-top:active { transform: scale(0.9); }