*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0f0f1a;--card:#1a1a2e;--card2:#222240;--text:#eee;--text2:#999;--radius:14px;--shadow:0 8px 32px rgba(0,0,0,0.3)}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans SC",sans-serif;background:var(--bg);color:var(--text);min-height:100vh}
.stars-bg{position:fixed;inset:0;background:radial-gradient(ellipse at 20% 50%,#1a1a3e 0%,transparent 50%),radial-gradient(ellipse at 80% 20%,#16213e 0%,transparent 50%);z-index:-1}
.container{max-width:800px;margin:0 auto;padding:0 16px}
.header{background:rgba(26,26,46,0.9);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,0.06);padding:14px 0;position:sticky;top:0;z-index:100}
.header-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px 10px}
.logo{display:flex;align-items:center;gap:8px}
.logo-icon{font-size:24px}
.logo h1{font-size:20px;font-weight:700;background:linear-gradient(135deg,#4ecdc4,#ff6b6b,#ffd93d);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
a{color:var(--text);text-decoration:none}
.section-title{font-size:18px;margin:20px 0 14px}

/* Dashboard */
.subjects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:16px 0}
.subject-card{display:block;background:var(--card);border-radius:var(--radius);padding:24px 20px;border:1px solid rgba(255,255,255,0.06);transition:all .3s}
.subject-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.subject-icon{font-size:40px;margin-bottom:10px}
.subject-card h3{font-size:18px;margin-bottom:4px}
.subject-card p{font-size:13px;color:var(--text2);margin-bottom:12px}
.progress-bar{height:6px;background:rgba(255,255,255,0.08);border-radius:3px;overflow:hidden}
.progress-fill{height:100%;border-radius:3px;transition:width .6s}

/* Chapter List */
.subject-header{display:flex;align-items:center;gap:12px;margin:20px 0}
.subject-header .emoji{font-size:40px}
.subject-header h2{font-size:22px}
.back-btn{padding:8px 16px;background:rgba(255,255,255,0.08);border-radius:8px;font-size:13px;transition:.3s;white-space:nowrap}
.back-btn:hover{background:rgba(255,255,255,0.15)}
.chapter-list{display:grid;gap:10px;margin:16px 0}
.chapter-item{display:flex;align-items:center;gap:14px;background:var(--card);border-radius:12px;padding:16px;border:1px solid rgba(255,255,255,0.06);transition:all .3s}
.chapter-item:hover{transform:translateX(4px);border-color:rgba(255,255,255,0.15)}
.ch-item-emoji{font-size:28px;flex-shrink:0}
.ch-item-info{flex:1}
.ch-item-info h4{font-size:15px;margin-bottom:2px}
.ch-item-info p{font-size:12px;color:var(--text2)}
.ch-item-btns{display:flex;gap:6px}
.ch-btn{padding:6px 14px;border-radius:8px;font-size:12px;font-weight:600;border:none;cursor:pointer;transition:all .3s;text-decoration:none;display:inline-block}
.ch-btn.learn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}
.ch-btn.practice{background:rgba(255,255,255,0.1);color:var(--text)}
.ch-btn:hover{transform:translateY(-2px)}

/* Learn Page */
.learn-container{max-width:750px;margin:0 auto;padding:16px}
.learn-header{text-align:center;margin-bottom:20px}
.learn-header .emoji{font-size:40px;margin-bottom:6px}
.learn-header h2{font-size:22px}
.intro-box{background:var(--card);border-radius:var(--radius);padding:20px;margin-bottom:16px;border-left:3px solid #667eea;line-height:1.7;font-size:15px}
.section-box{background:var(--card2);border-radius:var(--radius);padding:20px;margin-bottom:14px}
.section-box h3{font-size:16px;margin-bottom:10px;color:#667eea}
.section-box .content{white-space:pre-wrap;line-height:1.8;font-size:14px}
.example-box{background:var(--card);border-radius:var(--radius);padding:20px;margin-bottom:12px;border:1px solid rgba(255,255,255,0.08)}
.example-q{font-size:15px;font-weight:600;margin-bottom:12px;line-height:1.6}
.example-answer{display:none;background:rgba(78,205,196,0.08);border-radius:10px;padding:16px;margin-top:10px;border-left:3px solid #4ecdc4;white-space:pre-wrap;line-height:1.8;font-size:14px}
.show-btn{padding:8px 20px;background:rgba(78,205,196,0.15);color:#4ecdc4;border:1px solid #4ecdc4;border-radius:8px;cursor:pointer;font-size:13px;font-weight:600;transition:.3s}
.show-btn:hover{background:rgba(78,205,196,0.25)}
.step-box{display:flex;align-items:flex-start;gap:12px;margin-top:10px}
.step-num{background:#4ecdc4;color:#000;border-radius:50%;width:24px;height:24px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}
.step-text{line-height:1.6;font-size:14px}

/* Quiz Page (carried over) */
.quiz-container{max-width:700px;margin:0 auto;padding:20px}
.quiz-question{background:var(--card);border-radius:var(--radius);padding:24px;border:1px solid rgba(255,255,255,0.06)}
.quiz-q-text{font-size:17px;line-height:1.5;margin-bottom:16px}
.quiz-options{display:grid;gap:8px}
.opt-row{display:flex;align-items:stretch;gap:6px}
.opt-row .quiz-option{flex:1 1 auto;min-width:0}
.opt-row .rd-btn{opacity:.5;font-size:15px;padding:0 6px}
.quiz-option{background:rgba(255,255,255,0.04);border:2px solid rgba(255,255,255,0.08);border-radius:10px;padding:12px 16px;cursor:pointer;font-size:14px;color:var(--text);text-align:left;transition:all .25s}
.quiz-option:hover{border-color:#667eea;background:rgba(102,126,234,0.1)}
.quiz-option.correct{border-color:#4ecdc4;background:rgba(78,205,196,0.15)}
.quiz-option.wrong{border-color:#ff6b6b;background:rgba(255,107,107,0.15)}
.quiz-result{text-align:center;padding:32px 20px}
.quiz-result .emoji{font-size:56px;margin-bottom:10px}
.btn{padding:10px 24px;border-radius:10px;font-size:14px;font-weight:600;border:none;cursor:pointer;transition:.3s;text-decoration:none;display:inline-block}
.btn.primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}
.btn.secondary{background:rgba(255,255,255,0.08);color:var(--text)}
.btn-group{display:flex;gap:10px;justify-content:center;margin-top:14px}

/* Responsive */
@media(max-width:600px){.subjects-grid{grid-template-columns:1fr}.chapter-item{flex-wrap:wrap}.ch-item-btns{width:100%;justify-content:flex-end}}

/* === Vocabulary cards (inline terms + popup) === */
.v{border-bottom:1px dashed #ffd93d;cursor:pointer;color:#ffe6a0;padding:0 1px}
.v:hover{background:rgba(255,217,61,0.14);border-radius:3px}
.vpop{position:absolute;z-index:300;width:min(280px,calc(100vw - 24px));background:#20203a;border:1px solid rgba(255,217,61,0.35);border-radius:12px;padding:14px 16px 12px;box-shadow:0 10px 30px rgba(0,0,0,0.45);color:var(--text)}
.vpop[hidden]{display:none}
.vpop-en{font-size:15px;font-weight:700;color:#ffd93d;padding-right:18px;word-break:break-word}
.vpop-ipa{font-size:13px;color:#a7e8dc;margin-top:3px}
.vpop-zh{font-size:14px;margin-top:6px;line-height:1.5}
.vpop-close{position:absolute;top:6px;right:8px;background:none;border:none;color:var(--text2);font-size:18px;line-height:1;cursor:pointer;padding:2px 4px}
.vpop-close:hover{color:#fff}
.vpop-spk{margin-top:10px;padding:6px 14px;border-radius:8px;border:1px solid rgba(78,205,196,0.5);background:rgba(78,205,196,0.12);color:#a7e8dc;font-size:13px;font-weight:600;cursor:pointer;transition:.2s}
.vpop-spk:hover{background:rgba(78,205,196,0.25)}
.zh-note{margin-top:12px;padding-top:10px;border-top:1px dashed rgba(255,255,255,0.15);color:#ffe6a0;font-size:13.5px;line-height:1.7}
.hint-btn{margin-top:10px;padding:6px 14px;border-radius:8px;border:1px dashed rgba(255,217,61,0.5);background:rgba(255,217,61,0.08);color:#ffd93d;font-size:13px;cursor:pointer}
.hint-btn:hover{background:rgba(255,217,61,0.18)}
.hint-box{margin-top:8px;padding:8px 12px;border-left:3px solid #ffd93d;background:rgba(255,217,61,0.07);border-radius:6px;color:#ffe6a0;font-size:13.5px;line-height:1.6}
.vlist{margin-top:12px;padding-top:9px;border-top:1px dashed rgba(255,255,255,0.12);font-size:13px;color:var(--text2);line-height:2}
.vlist .v{margin-left:6px}

/* === Sentence read-aloud (English-medium UT1 chapters) === */
.rd-line{display:flex;gap:6px;align-items:flex-start}
.rd-line>.rd-txt{flex:1;min-width:0;white-space:pre-wrap}
.rd-gap{height:10px}
.rd-btn{flex:0 0 auto;background:none;border:none;cursor:pointer;font-size:12px;line-height:1.6;padding:0 2px;opacity:.35;transition:opacity .2s}
.rd-btn:hover{opacity:1}
.rd-btn.playing{opacity:1}

/* === Student code chip === */
.student-chip{background:rgba(102,126,234,0.18);border:1px solid rgba(102,126,234,0.45);color:#cfd6ff;font-size:12px;font-weight:600;padding:5px 10px;border-radius:20px;cursor:pointer;transition:.2s;white-space:nowrap}
.student-chip:hover{background:rgba(102,126,234,0.32)}

/* === Quiz: progress, topic, explanations, wrong review === */
.progress-line{height:6px;background:rgba(255,255,255,0.08);border-radius:3px;overflow:hidden;margin:0 0 14px}
.progress-line-fill{height:100%;width:0;background:linear-gradient(90deg,#4ecdc4,#667eea);border-radius:3px;transition:width .3s}
.quiz-topic{font-size:12px;color:#ffd93d;margin-bottom:6px}
.loading-box{text-align:center;padding:40px 20px;color:var(--text2)}
.explain-box{margin-top:14px;padding:12px 14px;border-radius:10px;font-size:13.5px;line-height:1.7}
.explain-box.ok{background:rgba(78,205,196,0.12);border-left:3px solid #4ecdc4}
.explain-box.bad{background:rgba(255,107,107,0.12);border-left:3px solid #ff6b6b}
.explain-text{margin-top:6px;color:#e8e8f0}
.wrong-review{margin:20px auto;max-width:640px;text-align:left}
.wrong-review h4{text-align:center;margin-bottom:10px}
.wrong-item{background:var(--card);border-radius:10px;padding:12px 14px;margin-bottom:10px;font-size:13.5px;line-height:1.7}
.wrong-item .wq{font-weight:600;margin-bottom:6px}
.wrong-item .wa{font-size:12.5px;color:var(--text2)}
.wrong-item .wa .bad{color:#ff8b8b}
.wrong-item .wa .ok{color:#4ecdc4}
.wrong-item .we{margin-top:6px;color:#ffe6a0}
.wrong-item .wt{margin-top:4px;font-size:11.5px;color:var(--text2)}
.all-correct{text-align:center;padding:16px;color:#4ecdc4;font-weight:600}

/* === Wrong-answer book === */
.wb-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;background:var(--card);border-radius:12px;padding:16px;margin:16px 0}
.wb-tip{font-size:12px;color:var(--text2);margin-top:4px}
.wb-actions{display:flex;gap:8px;flex-wrap:wrap}
.wb-section{background:var(--card);border-radius:12px;padding:16px;margin-bottom:14px}
.wb-section-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.wb-section-head h3{font-size:15px}
.wb-item{border-top:1px dashed rgba(255,255,255,0.12);padding:10px 0;font-size:13.5px;line-height:1.7}
.wb-topic{font-size:11.5px;color:#ffd93d}
.wb-q{margin:4px 0;font-weight:600}
.wb-a{color:#4ecdc4;font-size:13px}
.wb-e{color:#ffe6a0;margin-top:4px}

/* === Parent dashboard === */
.dash-picker{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:var(--card);border-radius:12px;padding:14px 16px;margin:16px 0;font-size:14px}
.dash-picker input{flex:1;min-width:160px;padding:9px 12px;border-radius:8px;border:1px solid rgba(255,255,255,0.15);background:rgba(255,255,255,0.05);color:var(--text);font-size:14px}
.dash-h{font-size:16px;margin:22px 0 10px}
.dash-table{width:100%;border-collapse:collapse;font-size:13.5px}
.dash-table th{text-align:left;font-size:12px;color:var(--text2);padding:9px 8px;border-bottom:1px solid rgba(255,255,255,0.08)}
.dash-table td{padding:9px 8px;border-bottom:1px solid rgba(255,255,255,0.04)}
.dash-table tr:hover td{background:rgba(255,255,255,0.02)}
.mini-link{color:#667eea;font-size:13px}
.badge.english,.badge.chinese,.badge.math{background:rgba(255,255,255,0.1);color:#ccc}

/* === Shared cards / stats (dashboard, review) === */
.stats-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:16px 0}
.stat-mini{background:var(--card);border-radius:10px;padding:14px;text-align:center}
.stat-mini .num{font-size:22px;font-weight:700}
.stat-mini .label{font-size:11px;color:var(--text2);margin-top:2px}
.no-data{padding:40px;text-align:center;color:var(--text2)}
.badge{display:inline-block;padding:2px 8px;border-radius:10px;font-size:11px;font-weight:600}
.badge.ut1{background:rgba(244,114,182,0.2);color:#f472b6}
.badge.dse{background:rgba(167,139,250,0.2);color:#a78bfa}
.badge.sci{background:rgba(78,205,196,0.2);color:#4ecdc4}
.badge.geo{background:rgba(52,211,153,0.2);color:#34d399}
.badge.chist{background:rgba(232,176,75,0.2);color:#e8b04b}
.badge.ces{background:rgba(96,165,250,0.2);color:#60a5fa}
.filter-bar{display:flex;gap:8px;margin:16px 0;flex-wrap:wrap}
.filter-btn{padding:8px 18px;border-radius:8px;font-size:13px;font-weight:600;text-decoration:none;transition:.3s}
.filter-btn.active{color:#fff;background:linear-gradient(135deg,#667eea,#764ba2)}
.filter-btn:not(.active){color:var(--text);background:rgba(255,255,255,0.06)}
.vocab-hint{text-align:center;font-size:12px;color:var(--text2);margin:-6px 0 12px}
.ai-voice-note{text-align:center;font-size:11.5px;color:var(--text2);opacity:.8;padding:8px 16px 26px;margin:0}