/* ===== CSS Variables ===== */
:root {
  --c-primary: #0D47A1;
  --c-primary-light: #1976D2;
  --c-primary-bg: #E3F2FD;
  --c-secondary: #2E7D32;
  --c-secondary-light: #43A047;
  --c-secondary-bg: #E8F5E9;
  --c-accent: #E65100;
  --c-accent-light: #FF6D00;
  --c-accent-bg: #FFF3E0;
  --c-purple: #6A1B9A;
  --c-purple-bg: #F3E5F5;
  --c-teal: #00695C;
  --c-teal-bg: #E0F2F1;
  --c-red: #C62828;
  --c-amber: #F9A825;

  --c-bg: #F0F2F5;
  --c-surface: #FFFFFF;
  --c-surface-alt: #F7F9FC;
  --c-border: #E0E4EA;
  --c-text: #1A1A2E;
  --c-text-2: #4A5568;
  --c-text-3: #8896A8;
  --c-shadow: 0 2px 8px rgba(0,0,0,.08);
  --c-shadow-lg: 0 8px 30px rgba(0,0,0,.12);
  --c-radius: 12px;
  --c-radius-sm: 8px;
  --c-radius-lg: 20px;
  --c-transition: .25s cubic-bezier(.4,0,.2,1);

  --font-sans: 'Inter','Noto Sans SC',system-ui,-apple-system,sans-serif;
  --font-uz: 'Inter','Segoe UI',sans-serif;
}

/* ===== Reset ===== */
*,*::before,*::after { box-sizing: border-box; margin:0; padding:0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-top: 64px;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { max-width: 100%; }

/* ===== Header / Nav ===== */
#header {
  position: fixed; top:0; left:0; right:0; height:64px; z-index:1000;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.nav {
  max-width:1280px; margin:0 auto; height:100%;
  display:flex; align-items:center; justify-content:space-between;
  padding: 0 24px;
}
.nav-logo { display:flex; align-items:center; gap:10px; font-weight:800; font-size:18px; }
.nav-logo-icon {
  width:36px; height:36px; border-radius:8px;
  background: linear-gradient(135deg,var(--c-primary),var(--c-secondary));
  color:#fff; display:flex; align-items:center; justify-content:center;
  font-size:13px; font-weight:800; letter-spacing:1px;
}
.nav-links { display:flex; gap:4px; }
.nav-link {
  padding: 8px 16px; border-radius: var(--c-radius-sm);
  font-size: 15px; font-weight:500; color: var(--c-text-2);
  transition: var(--c-transition);
}
.nav-link:hover { background: var(--c-primary-bg); color: var(--c-primary); }
.nav-link.active { background: var(--c-primary); color: #fff; }
.nav-right { display:flex; gap:8px; }
.nav-btn {
  width:40px; height:40px; border-radius:8px;
  display:flex; align-items:center; justify-content:center;
  color: var(--c-text-2); transition: var(--c-transition);
}
.nav-btn:hover { background: var(--c-bg); color: var(--c-primary); }
.nav-toggle { display:none; flex-direction:column; gap:5px; padding:8px; }
.nav-toggle span {
  width:22px; height:2px; background:var(--c-text); border-radius:2px;
  transition: var(--c-transition);
}
.nav-toggle.open span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2){ opacity:0; }
.nav-toggle.open span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

@media(max-width:768px){
  .nav-toggle { display:flex; }
  .nav-links {
    position:fixed; top:64px; left:0; right:0; flex-direction:column;
    background:var(--c-surface); padding:12px; gap:4px;
    border-bottom:1px solid var(--c-border);
    box-shadow: var(--c-shadow);
    transform: translateY(-150%); transition: transform .3s;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-logo-text { font-size:15px; }
}

/* ===== Layout ===== */
#content { max-width:1280px; margin:0 auto; padding:32px 24px 60px; min-height: calc(100vh - 200px); }
.section { display:none; animation: fadeIn .4s ease; }
.section.active { display:block; }
@keyframes fadeIn { from{opacity:0;transform:translateY(10px);} to{opacity:1;transform:translateY(0);} }

.section-header { margin-bottom:32px; }
.section-header h1 { font-size:32px; font-weight:800; margin-bottom:8px; }
.section-header p { color:var(--c-text-2); font-size:16px; }
.section-header .badge {
  display:inline-flex; align-items:center; gap:6px;
  padding:4px 12px; border-radius:20px;
  background:var(--c-primary-bg); color:var(--c-primary);
  font-size:13px; font-weight:600; margin-bottom:12px;
}

/* ===== Home / Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-secondary) 100%);
  border-radius: var(--c-radius-lg);
  padding: 56px 48px; color: #fff; position: relative; overflow: hidden;
  margin-bottom: 32px;
}
.hero::before {
  content:''; position:absolute; top:-60px; right:-60px;
  width:300px; height:300px; border-radius:50%;
  background: rgba(255,255,255,.08);
}
.hero::after {
  content:''; position:absolute; bottom:-80px; left:40%;
  width:200px; height:200px; border-radius:50%;
  background: rgba(255,255,255,.05);
}
.hero-content { position:relative; z-index:1; max-width:700px; }
.hero h1 { font-size:42px; font-weight:800; line-height:1.2; margin-bottom:16px; }
.hero p { font-size:18px; opacity:.92; margin-bottom:28px; }
.hero-actions { display:flex; gap:12px; flex-wrap:wrap; }
.btn {
  padding: 14px 28px; border-radius: var(--c-radius-sm); font-weight:600; font-size:15px;
  transition: var(--c-transition); display:inline-flex; align-items:center; gap:8px;
}
.btn-primary { background:#fff; color:var(--c-primary); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 20px rgba(0,0,0,.2); }
.btn-outline { border:2px solid rgba(255,255,255,.4); color:#fff; }
.btn-outline:hover { background:rgba(255,255,255,.1); border-color:rgba(255,255,255,.8); }

/* Stats grid */
.stats-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-bottom:32px; }
.stat-card {
  background:var(--c-surface); border-radius:var(--c-radius); padding:24px;
  box-shadow: var(--c-shadow); text-align:center; border: 1px solid var(--c-border);
}
.stat-card .stat-num { font-size:32px; font-weight:800; color:var(--c-primary); }
.stat-card .stat-label { font-size:14px; color:var(--c-text-2); margin-top:4px; }

/* Feature cards */
.features-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; margin-bottom:32px; }
.feature-card {
  background:var(--c-surface); border-radius:var(--c-radius); padding:28px;
  box-shadow: var(--c-shadow); border:1px solid var(--c-border);
  transition: var(--c-transition);
}
.feature-card:hover { transform:translateY(-4px); box-shadow:var(--c-shadow-lg); }
.feature-icon {
  width:48px; height:48px; border-radius:12px; display:flex; align-items:center; justify-content:center;
  font-size:24px; margin-bottom:16px;
}
.feature-card h3 { font-size:18px; font-weight:700; margin-bottom:8px; }
.feature-card p { color:var(--c-text-2); font-size:14px; }

/* Roadmap */
.roadmap { background:var(--c-surface); border-radius:var(--c-radius); padding:32px; box-shadow:var(--c-shadow); border:1px solid var(--c-border); margin-bottom:24px;}
.roadmap h2 { font-size:22px; font-weight:700; margin-bottom:20px; }
.roadmap-steps { display:flex; flex-direction:column; gap:0; }
.roadmap-step {
  display:flex; gap:20px; position:relative; padding-bottom:24px;
}
.roadmap-step:last-child { padding-bottom:0; }
.roadmap-step::before {
  content:''; position:absolute; left:19px; top:40px; bottom:0; width:2px;
  background:var(--c-border);
}
.roadmap-step:last-child::before { display:none; }
.roadmap-num {
  width:40px; height:40px; border-radius:50%; flex-shrink:0; z-index:1;
  display:flex; align-items:center; justify-content:center; font-weight:700; color:#fff;
}
.roadmap-step h4 { font-size:16px; font-weight:700; margin-bottom:4px; }
.roadmap-step p { font-size:14px; color:var(--c-text-2); }

/* ===== Audio Button ===== */
.audio-btn {
  width:40px; height:40px; border-radius:50%; flex-shrink:0;
  display:inline-flex; align-items:center; justify-content:center;
  background:var(--c-accent-bg); color:var(--c-accent);
  transition: var(--c-transition); border:2px solid transparent;
}
.audio-btn:hover { background:var(--c-accent); color:#fff; transform:scale(1.08); }
.audio-btn.playing { background:var(--c-accent); color:#fff; animation: pulse 1s infinite; }
.audio-btn.repeat-btn { width:36px; height:36px; font-size:12px; }
.audio-btn.repeat-btn.playing { animation: pulse 1s infinite; }
@keyframes pulse {
  0%,100%{ box-shadow:0 0 0 0 rgba(230,81,0,.4); }
  50%{ box-shadow:0 0 0 8px rgba(230,81,0,0); }
}

.audio-btn svg { width:18px; height:18px; }

/* Repeat-3 button */
.repeat3-btn {
  display:inline-flex; align-items:center; gap:6px;
  padding:6px 14px; border-radius:20px; font-size:13px; font-weight:600;
  background:var(--c-secondary-bg); color:var(--c-secondary);
  transition: var(--c-transition); border:1px solid transparent;
}
.repeat3-btn:hover { background:var(--c-secondary); color:#fff; }
.repeat3-btn.playing { background:var(--c-secondary); color:#fff; animation:pulse 1s infinite; }
.repeat3-btn svg { width:14px; height:14px; }

/* Chinese audio narration button */
.zh-audio-btn {
  width:28px; height:28px; border-radius:50%; flex-shrink:0;
  display:inline-flex; align-items:center; justify-content:center;
  background:var(--c-primary-bg); color:var(--c-primary);
  font-size:13px; transition: var(--c-transition);
  border:1.5px solid transparent; cursor:pointer;
  margin-left:8px; vertical-align:middle;
}
.zh-audio-btn:hover { background:var(--c-primary); color:#fff; transform:scale(1.1); }
.zh-audio-btn.playing { background:var(--c-primary); color:#fff; animation: pulse 1s infinite; }

/* Narration toggle in nav */
.nav-btn.active {
  background:var(--c-primary); color:#fff;
  border-color:var(--c-primary);
}

/* ===== Alphabet ===== */
.alphabet-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(140px,1fr)); gap:12px; }
.letter-card {
  background:var(--c-surface); border-radius:var(--c-radius); padding:20px;
  box-shadow: var(--c-shadow); border:1px solid var(--c-border);
  text-align:center; transition: var(--c-transition); cursor:pointer;
}
.letter-card:hover { transform:translateY(-4px); box-shadow:var(--c-shadow-lg); border-color:var(--c-primary-light); }
.letter-card .letter-big {
  font-size:42px; font-weight:800; color:var(--c-primary); font-family:var(--font-uz);
  line-height:1; margin-bottom:4px;
}
.letter-card .letter-small { font-size:22px; color:var(--c-text-3); font-family:var(--font-uz); margin-bottom:8px; }
.letter-card .letter-name { font-size:13px; color:var(--c-text-2); margin-bottom:12px; }
.letter-card .letter-audio { display:flex; justify-content:center; gap:8px; }

/* Pronunciation tips */
.pron-tips { background:var(--c-surface); border-radius:var(--c-radius); padding:28px; box-shadow:var(--c-shadow); margin-bottom:24px; border:1px solid var(--c-border); }
.pron-tips h3 { font-size:18px; font-weight:700; margin-bottom:12px; display:flex; align-items:center; gap:8px; }
.pron-tips p { color:var(--c-text-2); font-size:14px; margin-bottom:8px; }
.pron-tips .tip { display:flex; gap:12px; padding:10px 0; border-bottom:1px solid var(--c-border); }
.pron-tips .tip:last-child { border-bottom:none; }
.pron-tips .tip-icon { font-size:20px; flex-shrink:0; }

/* ===== Vocabulary ===== */
.vocab-toolbar { display:flex; gap:12px; margin-bottom:20px; flex-wrap:wrap; align-items:center; }
.search-box {
  flex:1; min-width:200px; position:relative;
}
.search-box input {
  width:100%; padding:12px 16px 12px 44px; border:1px solid var(--c-border);
  border-radius: var(--c-radius-sm); font-size:15px; font-family:inherit; background:var(--c-surface);
  transition: var(--c-transition);
}
.search-box input:focus { outline:none; border-color:var(--c-primary-light); box-shadow:0 0 0 3px var(--c-primary-bg); }
.search-box svg { position:absolute; left:14px; top:50%; transform:translateY(-50%); color:var(--c-text-3); }

.level-filter { display:flex; gap:6px; }
.level-chip {
  padding:8px 16px; border-radius:20px; font-size:13px; font-weight:600;
  background:var(--c-surface); border:1px solid var(--c-border); color:var(--c-text-2);
  transition: var(--c-transition);
}
.level-chip:hover { border-color:var(--c-primary-light); }
.level-chip.active { background:var(--c-primary); color:#fff; border-color:var(--c-primary); }

.cat-tabs { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:24px; }
.cat-tab {
  padding:8px 18px; border-radius:20px; font-size:14px; font-weight:500;
  background:var(--c-surface); border:1px solid var(--c-border); color:var(--c-text-2);
  transition: var(--c-transition); display:flex; align-items:center; gap:6px;
}
.cat-tab:hover { border-color:var(--c-primary-light); color:var(--c-primary); }
.cat-tab.active { background:var(--c-primary); color:#fff; border-color:var(--c-primary); }
.cat-tab .count { font-size:12px; opacity:.8; }

.vocab-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:12px; }
.vocab-card {
  background:var(--c-surface); border-radius:var(--c-radius); padding:18px;
  box-shadow:var(--c-shadow); border:1px solid var(--c-border);
  transition: var(--c-transition); display:flex; align-items:flex-start; gap:14px;
}
.vocab-card:hover { box-shadow:var(--c-shadow-lg); border-color:var(--c-primary-light); transform:translateY(-2px); }
.vocab-card .vc-main { flex:1; min-width:0; }
.vocab-card .vc-uz { font-size:20px; font-weight:700; color:var(--c-primary); font-family:var(--font-uz); margin-bottom:2px; word-break:break-word; }
.vocab-card .vc-zh { font-size:15px; color:var(--c-text); font-weight:500; }
.vocab-card .vc-pron { font-size:12px; color:var(--c-text-3); margin-top:2px; font-style:italic; }
.vocab-card .vc-example { font-size:13px; color:var(--c-text-2); margin-top:8px; padding-top:8px; border-top:1px solid var(--c-border); }
.vocab-card .vc-example .ex-uz { color:var(--c-secondary); font-weight:500; }
.vocab-card .vc-audio { flex-shrink:0; display:flex; flex-direction:column; gap:6px; }
.vocab-card .vc-zh-wrap { display:flex; align-items:center; flex-wrap:wrap; gap:4px; }
.vocab-card .vc-zh-audio .zh-audio-btn,
.vocab-card .vc-ex-zh-audio .zh-audio-btn { width:22px; height:22px; font-size:11px; margin-left:2px; }
.vocab-card .vc-ex-zh-wrap { display:flex; align-items:center; flex-wrap:wrap; gap:4px; margin-top:2px; }
.vocab-card .vc-ex-zh-wrap .ex-zh { color:var(--c-text-3); font-size:12px; }

.vocab-card .vc-badge {
  display:inline-block; padding:2px 8px; border-radius:4px; font-size:11px; font-weight:600;
  margin-top:6px;
}
.badge-A1 { background:var(--c-secondary-bg); color:var(--c-secondary); }
.badge-A2 { background:var(--c-primary-bg); color:var(--c-primary); }
.badge-B1 { background:var(--c-purple-bg); color:var(--c-purple); }
.badge-B2 { background:var(--c-teal-bg); color:var(--c-teal); }

.vocab-empty { text-align:center; padding:60px 20px; color:var(--c-text-3); }
.vocab-progress { font-size:13px; color:var(--c-text-2); margin-bottom:16px; display:flex; align-items:center; gap:8px; }
.progress-bar { height:6px; background:var(--c-border); border-radius:3px; overflow:hidden; flex:1; max-width:200px; }
.progress-bar-fill { height:100%; background:var(--c-secondary); border-radius:3px; transition:width .3s; }

/* ===== Grammar ===== */
.grammar-sidebar { display:flex; flex-direction:column; gap:8px; margin-bottom:24px; }
.grammar-item {
  background:var(--c-surface); border-radius:var(--c-radius); padding:16px 20px;
  box-shadow:var(--c-shadow); border:1px solid var(--c-border);
  transition:var(--c-transition); cursor:pointer;
}
.grammar-item:hover { border-color:var(--c-primary-light); }
.grammar-item.active { border-color:var(--c-primary); border-left:4px solid var(--c-primary); }
.grammar-item-header { display:flex; align-items:center; justify-content:space-between; gap:12px; }
.grammar-item h3 { font-size:17px; font-weight:700; }
.grammar-item .gi-meta { display:flex; align-items:center; gap:8px; }
.grammar-item .gi-level {
  padding:2px 10px; border-radius:4px; font-size:11px; font-weight:600;
}
.grammar-item .gi-toggle { font-size:14px; color:var(--c-text-3); transition:transform .3s; }
.grammar-item.active .gi-toggle { transform:rotate(180deg); }

.grammar-content {
  max-height:0; overflow:hidden; transition:max-height .4s ease;
}
.grammar-item.active .grammar-content { max-height:5000px; }

.grammar-body { padding:20px 0 8px; }
.grammar-section { margin-bottom:20px; }
.grammar-section h4 { font-size:16px; font-weight:700; margin-bottom:8px; color:var(--c-primary); }
.grammar-section p { font-size:14px; color:var(--c-text-2); margin-bottom:8px; line-height:1.8; }
.grammar-table { width:100%; border-collapse:collapse; margin:12px 0; font-size:14px; }
.grammar-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; margin:12px 0; }
.grammar-table-wrap .grammar-table { min-width:500px; margin:0; }
.grammar-table th { background:var(--c-primary-bg); padding:10px 12px; text-align:left; font-weight:600; color:var(--c-primary); border:1px solid var(--c-border); }
.grammar-table td { padding:10px 12px; border:1px solid var(--c-border); }
.grammar-table tr:nth-child(even) td { background:var(--c-surface-alt); }
.grammar-example {
  background:var(--c-surface-alt); border-radius:var(--c-radius-sm); padding:12px 16px;
  margin:8px 0; display:flex; align-items:center; gap:12px;
}
.grammar-example .ge-text { flex:1; }
.grammar-example .ge-uz { font-weight:600; color:var(--c-primary); font-family:var(--font-uz); font-size:15px; }
.grammar-example .ge-zh { color:var(--c-text-2); font-size:14px; }
.grammar-note {
  background:var(--c-accent-bg); border-radius:var(--c-radius-sm); padding:12px 16px;
  margin:8px 0; font-size:13px; color:var(--c-accent); border-left:3px solid var(--c-accent);
}
.grammar-note strong { font-weight:700; }

/* ===== Conversation ===== */
.conv-scenarios { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:16px; margin-bottom:24px; }
.conv-card {
  background:var(--c-surface); border-radius:var(--c-radius); overflow:hidden;
  box-shadow:var(--c-shadow); border:1px solid var(--c-border);
  transition:var(--c-transition); cursor:pointer;
}
.conv-card:hover { box-shadow:var(--c-shadow-lg); transform:translateY(-2px); }
.conv-card.active { border-color:var(--c-primary); }
.conv-card-header { padding:20px; }
.conv-card-header h3 { font-size:18px; font-weight:700; margin-bottom:4px; }
.conv-card-header p { font-size:14px; color:var(--c-text-2); }
.conv-card-header .conv-level { display:inline-block; margin-top:8px; }

.conv-detail { display:none; }
.conv-detail.active { display:block; }

.dialogue-list { display:flex; flex-direction:column; gap:2px; margin:20px 0; }
.dialogue-line {
  display:flex; gap:12px; padding:16px; border-radius:var(--c-radius);
  align-items:flex-start;
}
.dialogue-line.speaker-a { background:var(--c-primary-bg); }
.dialogue-line.speaker-b { background:var(--c-secondary-bg); margin-left:32px; }
.dialogue-line.speaker-c { background:var(--c-accent-bg); margin-left:64px; }
.dialogue-avatar {
  width:36px; height:36px; border-radius:50%; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  font-weight:700; color:#fff; font-size:14px;
}
.speaker-a .dialogue-avatar { background:var(--c-primary); }
.speaker-b .dialogue-avatar { background:var(--c-secondary); }
.speaker-c .dialogue-avatar { background:var(--c-accent); }
.dialogue-body { flex:1; }
.dialogue-uz { font-size:16px; font-weight:600; color:var(--c-text); font-family:var(--font-uz); margin-bottom:2px; }
.dialogue-zh { font-size:14px; color:var(--c-text-2); }
.dialogue-actions { display:flex; gap:8px; margin-top:8px; }
.dialogue-play-all {
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 20px; border-radius:var(--c-radius-sm);
  background:var(--c-primary); color:#fff; font-weight:600; font-size:14px;
  transition:var(--c-transition); margin-bottom:16px;
}
.dialogue-play-all:hover { background:var(--c-primary-light); }
.conv-close-btn {
  width:32px; height:32px; border-radius:50%; border:none; cursor:pointer;
  background:var(--c-surface-alt); color:var(--c-text-2);
  font-size:16px; display:flex; align-items:center; justify-content:center;
  transition:var(--c-transition);
}
.conv-close-btn:hover { background:#e0e0e0; color:var(--c-text); }

/* ===== Quiz Category Selector ===== */
.quiz-cat-bar { margin-bottom:24px; }
.quiz-cat-select {
  width:100%; max-width:400px; padding:12px 16px; border-radius:var(--c-radius-sm);
  border:2px solid var(--c-border); background:var(--c-surface); color:var(--c-text);
  font-size:15px; font-family:var(--font); cursor:pointer; outline:none;
  transition:var(--c-transition);
}
.quiz-cat-select:focus { border-color:var(--c-primary); }
.quiz-card {
  background:var(--c-surface); border-radius:var(--c-radius); padding:32px;
  box-shadow:var(--c-shadow); border:1px solid var(--c-border); margin-bottom:20px;
}
.quiz-progress-info { display:flex; justify-content:space-between; align-items:center; margin-bottom:16px; }
.quiz-type {
  padding:4px 12px; border-radius:6px; font-size:13px; font-weight:600;
  background:var(--c-purple-bg); color:var(--c-purple);
}
.quiz-question { font-size:22px; font-weight:700; margin-bottom:24px; text-align:center; }
.quiz-question .q-text { color:var(--c-primary); font-family:var(--font-uz); }
.quiz-options { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.quiz-option {
  padding:16px 20px; border:2px solid var(--c-border); border-radius:var(--c-radius-sm);
  font-size:16px; font-weight:500; text-align:center; transition:var(--c-transition);
  background:var(--c-surface);
}
.quiz-option:hover { border-color:var(--c-primary-light); background:var(--c-primary-bg); }
.quiz-option.correct { border-color:var(--c-secondary); background:var(--c-secondary-bg); color:var(--c-secondary); }
.quiz-option.wrong { border-color:var(--c-red); background:#FFEBEE; color:var(--c-red); }
.quiz-option:disabled { cursor:default; }
.quiz-feedback { text-align:center; margin-top:20px; font-size:16px; font-weight:600; min-height:24px; }
.quiz-feedback.correct { color:var(--c-secondary); }
.quiz-feedback.wrong { color:var(--c-red); }
.quiz-actions { display:flex; justify-content:center; gap:12px; margin-top:20px; }
.quiz-audio-prompt {
  text-align:center; margin-bottom:20px;
}
.quiz-audio-btn {
  width:80px; height:80px; border-radius:50%; margin:0 auto;
  background:var(--c-accent); color:#fff; display:flex; align-items:center; justify-content:center;
  font-size:32px; transition:var(--c-transition);
}
.quiz-audio-btn:hover { transform:scale(1.1); }
.quiz-audio-btn.playing { animation:pulse 1s infinite; }
.quiz-config { display:flex; gap:16px; flex-wrap:wrap; margin-bottom:20px; }
.quiz-config-item { flex:1; min-width:200px; }
.quiz-config-item label { display:block; font-size:14px; font-weight:600; margin-bottom:8px; color:var(--c-text-2); }
.quiz-config-item select {
  width:100%; padding:10px 14px; border:1px solid var(--c-border); border-radius:var(--c-radius-sm);
  font-size:14px; background:var(--c-surface); font-family:inherit;
}

/* ===== Settings ===== */
.settings-card {
  background:var(--c-surface); border-radius:var(--c-radius); padding:32px;
  box-shadow:var(--c-shadow); border:1px solid var(--c-border); max-width:600px;
}
.settings-item { margin-bottom:24px; }
.settings-item label { display:block; font-size:14px; font-weight:600; margin-bottom:8px; }
.settings-item input[type="range"] { width:100%; }
.settings-item select {
  width:100%; padding:10px 14px; border:1px solid var(--c-border); border-radius:var(--c-radius-sm);
  font-size:14px; background:var(--c-surface); font-family:inherit;
}
.settings-value { font-size:14px; color:var(--c-primary); font-weight:600; }
.voice-status { padding:12px 16px; border-radius:var(--c-radius-sm); font-size:13px; margin-top:8px; }
.voice-status.ok { background:var(--c-secondary-bg); color:var(--c-secondary); }
.voice-status.warn { background:var(--c-accent-bg); color:var(--c-accent); }

/* ===== Toast ===== */
.toast {
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(100px);
  background:var(--c-text); color:#fff; padding:12px 24px; border-radius:var(--c-radius-sm);
  font-size:14px; z-index:2000; opacity:0; transition:all .3s; pointer-events:none;
}
.toast.show { transform:translateX(-50%) translateY(0); opacity:1; }

/* ===== Footer ===== */
.footer { background:var(--c-surface); border-top:1px solid var(--c-border); padding:40px 24px 20px; margin-top:40px; }
.footer-inner { max-width:1280px; margin:0 auto; display:grid; grid-template-columns:repeat(3,1fr); gap:32px; }
.footer-section h4 { font-size:16px; font-weight:700; margin-bottom:8px; }
.footer-section p { font-size:14px; color:var(--c-text-2); }
.footer-bottom { max-width:1280px; margin:24px auto 0; padding-top:20px; border-top:1px solid var(--c-border); text-align:center; }
.footer-bottom p { font-size:13px; color:var(--c-text-3); }

/* ===== Responsive ===== */
@media(max-width:768px){
  .hero { padding:32px 24px; }
  .hero h1 { font-size:28px; }
  .hero p { font-size:15px; }
  .stats-grid { grid-template-columns:repeat(2,1fr); }
  .features-grid { grid-template-columns:1fr; }
  .vocab-grid { grid-template-columns:1fr; }
  .quiz-options { grid-template-columns:1fr; }
  .footer-inner { grid-template-columns:1fr; }
  .section-header h1 { font-size:24px; }
  .dialogue-line.speaker-b { margin-left:16px; }
  .dialogue-line.speaker-c { margin-left:32px; }
  .alphabet-grid { grid-template-columns:repeat(auto-fill,minmax(110px,1fr)); }
}
@media(max-width:480px){
  .stats-grid { grid-template-columns:1fr 1fr; }
  .alphabet-grid { grid-template-columns:repeat(2,1fr); }
}

/* ===== PIN Gate (Access Control) ===== */
.pin-gate {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0D47A1 0%, #1976D2 40%, #2E7D32 100%);
  padding: 20px;
  overflow-y: auto;
}

.pin-gate-card {
  background: #fff;
  border-radius: 24px;
  padding: 40px 36px 32px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  text-align: center;
  animation: pinCardIn 0.5s ease;
}

@keyframes pinCardIn {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.pin-gate-card.shake {
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

.pin-gate-logo {
  margin-bottom: 20px;
}

.pin-gate-logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, #0D47A1, #1976D2);
  color: #fff;
  font-size: 28px;
  font-weight: 800;
  font-family: 'Inter', sans-serif;
  letter-spacing: -1px;
}

.pin-gate-title {
  font-size: 22px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 6px;
  line-height: 1.4;
}

.pin-gate-subtitle {
  font-size: 14px;
  color: #666;
  margin-bottom: 24px;
}

/* ===== PIN Gate Steps ===== */
.pin-step {
  background: #f8f9fa;
  border-radius: 16px;
  padding: 16px 18px;
  margin-bottom: 14px;
  text-align: left;
}

.pin-step-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.pin-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0D47A1, #1976D2);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.pin-step-title {
  font-size: 16px;
  font-weight: 700;
  color: #1a1a2e;
}

.pin-step-body {
  padding-left: 38px;
}

.pin-step-desc {
  font-size: 13px;
  color: #555;
  line-height: 1.6;
  margin-top: 10px;
}

.pin-step-desc strong {
  color: #E65100;
  font-size: 16px;
}

/* Payment QR code */
.pin-pay-qr {
  width: 140px;
  height: 140px;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  border: 2px solid #07C160;
  margin: 0 auto;
}

.pin-pay-qr img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

/* Wechat row in step 2 */
.pin-wechat-row {
  display: flex;
  gap: 16px;
  align-items: center;
}

.pin-wechat-info {
  flex: 1;
  min-width: 0;
}

.pin-device-tip {
  font-size: 12px;
  color: #888;
  margin-top: 10px;
  text-align: center;
}

.pin-gate-qr {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  border: 1px solid #e0e0e0;
}

.pin-gate-qr img {
  width: 100%;
  height: 100%;
  display: block;
}

.qr-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #999;
  text-align: center;
}

.pin-gate-wechat-info {
  flex: 1;
  min-width: 0;
}

.pin-gate-wechat-label {
  font-size: 12px;
  color: #888;
  margin-bottom: 8px;
}

.pin-gate-wechat-id {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.wechat-id-text {
  font-size: 18px;
  font-weight: 700;
  color: #0D47A1;
  font-family: 'Inter', monospace;
  letter-spacing: 0.5px;
}

.copy-wechat-btn {
  flex-shrink: 0;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border: 1.5px solid #0D47A1;
  background: #fff;
  color: #0D47A1;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-wechat-btn:hover {
  background: #0D47A1;
  color: #fff;
}

.pin-gate-tip {
  font-size: 13px;
  color: #E65100;
  font-weight: 500;
  line-height: 1.5;
}

.pin-gate-input-area {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 8px;
}

.pin-input {
  width: 100%;
  padding: 16px 20px;
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 12px;
  border: 2px solid #e0e0e0;
  border-radius: 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: 'Inter', monospace;
  color: #1a1a2e;
  background: #fafafa;
}

.pin-input:focus {
  border-color: #0D47A1;
  box-shadow: 0 0 0 4px rgba(13, 71, 161, 0.1);
  background: #fff;
}

.pin-input::placeholder {
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0;
  color: #aaa;
}

.pin-submit-btn {
  width: 100%;
  padding: 16px;
  font-size: 17px;
  font-weight: 700;
  border: none;
  border-radius: 14px;
  background: linear-gradient(135deg, #0D47A1, #1976D2);
  color: #fff;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
}

.pin-submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(13, 71, 161, 0.3);
}

.pin-submit-btn:active {
  transform: translateY(0);
}

.pin-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.pin-error {
  font-size: 14px;
  color: #d32f2f;
  font-weight: 500;
  margin-top: 8px;
  padding: 8px 12px;
  background: #ffebee;
  border-radius: 8px;
}

.pin-gate-footer {
  font-size: 12px;
  color: #bbb;
  margin-top: 24px;
}

/* PIN Gate mobile responsive */
@media (max-width: 380px) {
  .pin-gate-card {
    padding: 32px 24px 24px;
  }
  .pin-gate-wechat {
    flex-direction: column;
    text-align: center;
  }
  .pin-gate-wechat-id {
    justify-content: center;
  }
  .pin-gate-qr {
    width: 90px;
    height: 90px;
  }
}

/* ================================================================
   每日必学 · Daily Must-Learn (dw-*)
   ================================================================ */
.badge-amber { background:#FFF8E1; color:var(--c-amber); }

.dw-overview {
  display:grid; grid-template-columns:repeat(3,1fr); gap:14px;
  margin:20px 0 24px;
}
.dw-stat {
  background:#fff; border:1px solid var(--c-border); border-radius:14px;
  padding:16px 12px; text-align:center;
  display:flex; flex-direction:column; gap:4px;
  box-shadow:0 2px 8px rgba(13,71,161,.05);
}
.dw-stat-num { font-size:26px; font-weight:800; color:var(--c-primary); font-family:'Inter',sans-serif; }
.dw-stat-label { font-size:13px; color:var(--c-text-light, #666); }

.dw-months { display:flex; flex-wrap:wrap; gap:8px; margin-bottom:6px; }
.dw-mchip { padding:6px 13px; font-size:13px; }
.dw-month-desc { font-weight:600; color:var(--c-text, #444); }

.dw-weeks { display:flex; flex-wrap:wrap; gap:10px; }
.dw-chip {
  padding:8px 16px; border-radius:999px; border:1.5px solid var(--c-border);
  background:#fff; color:var(--c-text, #333); font-size:14px; font-weight:600;
  cursor:pointer; transition:all .2s;
}
.dw-chip:hover { border-color:var(--c-primary-light); background:var(--c-primary-bg); }
.dw-chip.active { background:var(--c-primary); border-color:var(--c-primary); color:#fff; }

.dw-week-desc { font-size:13.5px; color:var(--c-text-light, #777); margin:10px 2px 14px; }

.dw-days {
  display:grid; grid-template-columns:repeat(7,1fr); gap:8px; margin-bottom:22px;
}
.dw-daytab {
  display:flex; flex-direction:column; align-items:center; gap:3px;
  padding:10px 4px 8px; border-radius:12px; border:1.5px solid var(--c-border);
  background:#fff; cursor:pointer; transition:all .2s; font-family:inherit;
}
.dw-daytab:hover { border-color:var(--c-primary-light); background:var(--c-primary-bg); }
.dw-daytab.active { border-color:var(--c-primary); background:var(--c-primary-bg); box-shadow:0 2px 10px rgba(13,71,161,.12); }
.dw-daytab-icon { font-size:20px; line-height:1; }
.dw-daytab-name { font-size:13px; font-weight:700; color:var(--c-text, #333); }
.dw-daytab-topic { font-size:11px; color:var(--c-text-light, #888); text-align:center; line-height:1.25; }
.dw-daytab-cnt { font-size:11px; font-weight:700; color:#999; background:#F5F5F5; border-radius:999px; padding:1px 8px; }
.dw-daytab-ready { font-size:11px; font-weight:700; color:var(--c-secondary); background:var(--c-secondary-bg); border-radius:999px; padding:1px 8px; }
.dw-daytab-pass { font-size:11px; font-weight:700; color:var(--c-amber); background:#FFF8E1; border-radius:999px; padding:1px 8px; }

.dw-day-header {
  display:flex; align-items:center; gap:12px; flex-wrap:wrap; margin:6px 0 14px;
}
.dw-day-header h3 { font-size:19px; margin:0; }
.dw-day-mastered {
  font-size:13px; font-weight:700; color:var(--c-primary);
  background:var(--c-primary-bg); border-radius:999px; padding:4px 12px;
}
.dw-passed-badge {
  font-size:13px; font-weight:700; color:var(--c-amber);
  background:#FFF8E1; border-radius:999px; padding:4px 12px;
}

.dw-cards { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.dw-card {
  background:#fff; border:1px solid var(--c-border); border-radius:16px;
  padding:18px; display:flex; flex-direction:column; gap:10px;
  transition:all .25s;
}
.dw-card.mastered { border-color:var(--c-secondary); background:linear-gradient(180deg,#F6FBF7 0%,#fff 60%); }
.dw-card-head { display:flex; justify-content:space-between; align-items:flex-start; gap:8px; }
.dw-word-line { display:flex; flex-direction:column; gap:2px; min-width:0; }
.dw-uz { font-size:22px; font-weight:800; color:var(--c-primary); word-break:break-word; }
.dw-pron { font-size:13px; color:var(--c-text-light, #888); font-style:italic; }
.dw-word-btns { display:flex; gap:6px; flex-shrink:0; align-items:center; }
.dw-audio-slot { display:inline-flex; }

.dw-zh { font-size:15px; font-weight:600; color:var(--c-text, #333); }

.dw-sentences { display:flex; flex-direction:column; gap:8px; }
.dw-sent {
  background:#FAFBFD; border-radius:10px; padding:10px 12px;
  border-left:3px solid var(--c-primary-light);
}
.dw-card.mastered .dw-sent { border-left-color:var(--c-secondary); }
.dw-sent-uz { display:flex; align-items:flex-start; gap:8px; font-size:15px; font-weight:600; color:var(--c-text, #2c2c2c); line-height:1.5; }
.dw-sent-zh { font-size:13px; color:var(--c-text-light, #777); margin-top:3px; }

.dw-master-btn {
  margin-top:auto; padding:10px; border-radius:10px; border:1.5px dashed var(--c-primary-light);
  background:#fff; color:var(--c-primary); font-size:14px; font-weight:700;
  cursor:pointer; transition:all .2s; font-family:inherit;
}
.dw-master-btn:hover { background:var(--c-primary-bg); }
.dw-master-btn.done {
  border-style:solid; border-color:var(--c-secondary);
  background:var(--c-secondary-bg); color:var(--c-secondary);
}

.dw-action-bar {
  margin-top:22px; background:#fff; border:1px solid var(--c-border); border-radius:16px;
  padding:20px; text-align:center;
  display:flex; flex-direction:column; gap:12px; align-items:center;
}
.dw-quiz-hint { font-size:14px; color:var(--c-text-light, #777); margin:0; }
.dw-quiz-btn { font-size:16px; padding:13px 34px; }

/* ===== 检验测验 ===== */
.dw-quiz-wrap { max-width:760px; margin:0 auto; }
.dw-quiz-meta {
  display:flex; justify-content:space-between; align-items:center; gap:10px;
  font-size:14px; font-weight:600; color:var(--c-text-light, #666); margin-bottom:10px;
}
.dw-quiz-exit {
  border:none; background:#F5F5F5; color:#999; border-radius:8px;
  padding:6px 12px; font-size:13px; cursor:pointer; font-family:inherit;
}
.dw-quiz-exit:hover { background:#FFEBEE; color:var(--c-red); }
.dw-quiz-progress { height:8px; background:#ECEFF3; border-radius:999px; overflow:hidden; margin-bottom:20px; }
.dw-quiz-progress-bar { height:100%; background:linear-gradient(90deg,var(--c-primary-light),var(--c-primary)); border-radius:999px; transition:width .3s; }

.dw-quiz-prompt-row { display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.dw-quiz-prompt { font-size:24px; margin:0; color:var(--c-primary); word-break:break-word; }
.dw-quiz-sub { font-size:14px; color:var(--c-text-light, #777); margin:8px 0 4px; }
.dw-quiz-pron { font-style:italic; }
.dw-quiz-zh { font-size:15px; color:var(--c-text, #333); margin:4px 0 8px; }
.dw-quiz-next { text-align:center; margin-top:18px; }

.quiz-option .quiz-option-letter {
  display:inline-flex; width:24px; height:24px; border-radius:6px;
  background:#EEF2F7; color:var(--c-text-light, #666);
  font-size:12px; font-weight:800; align-items:center; justify-content:center;
  margin-right:10px; flex-shrink:0;
}
.quiz-option { display:flex; align-items:center; }

/* ===== 检验结果 ===== */
.dw-result {
  max-width:560px; margin:30px auto; text-align:center;
  background:#fff; border:1px solid var(--c-border); border-radius:20px;
  padding:44px 28px 34px;
  box-shadow:0 8px 30px rgba(13,71,161,.08);
}
.dw-result.pass { border-color:var(--c-secondary); background:linear-gradient(180deg,#F4FBF6 0%,#fff 45%); }
.dw-result.fail { border-color:var(--c-amber); background:linear-gradient(180deg,#FFFDF4 0%,#fff 45%); }
.dw-result-icon { font-size:56px; line-height:1; margin-bottom:12px; }
.dw-result h2 { margin:0 0 6px; }
.dw-result-score { font-size:56px; font-weight:800; color:var(--c-primary); font-family:'Inter',sans-serif; }
.dw-result-score span { font-size:22px; color:var(--c-text-light, #999); font-weight:600; }
.dw-result-sub { font-size:15px; color:var(--c-text-light, #666); line-height:1.7; margin:12px 0; }
.dw-result-meta { font-size:14px; color:var(--c-text-light, #888); }
.dw-result-actions { display:flex; gap:12px; justify-content:center; flex-wrap:wrap; margin-top:22px; }
.dw-result .btn-outline { border:2px solid var(--c-primary); color:var(--c-primary); background:#fff; }
.dw-result .btn-outline:hover { background:var(--c-primary-bg); border-color:var(--c-primary); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .dw-cards { grid-template-columns:1fr; }
  .dw-days { grid-template-columns:repeat(4,1fr); }
  .dw-overview { grid-template-columns:repeat(3,1fr); gap:8px; }
  .dw-stat-num { font-size:20px; }
  .dw-stat-label { font-size:11px; }
}
@media (max-width: 480px) {
  .dw-days { grid-template-columns:repeat(2,1fr); }
  .dw-weeks { gap:8px; }
  .dw-chip { font-size:13px; padding:7px 12px; }
  .dw-uz { font-size:19px; }
  .dw-quiz-prompt { font-size:20px; }
  .quiz-options { grid-template-columns:1fr; }
}