*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f0f2f5;--surface: #ffffff;--border: #e2e6ed;--text-primary: #1c1f26;--text-secondary: #4a5568;--text-muted: #8a93a4;--accent: #4361ee;--accent-hover: #3251d8;--accent-light: #eef1ff;--green: #22c55e;--green-bg: #f0fdf4;--radius: 16px;--shadow: 0 4px 20px rgba(0, 0, 0, .08)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,sans-serif;background:var(--bg);color:var(--text-primary);line-height:1.6;min-height:100vh}.page{max-width:660px;margin:0 auto;padding:32px 16px 56px}.site-header{text-align:center;margin-bottom:28px}.site-title{font-size:1.6rem;font-weight:700;letter-spacing:-.02em;color:var(--text-primary)}.site-subtitle{margin-top:6px;font-size:.88rem;color:var(--text-muted)}.category-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px;justify-content:center}.cat-btn{padding:6px 14px;font-size:.8rem;font-weight:500;border:1.5px solid var(--border);border-radius:20px;background:var(--surface);color:var(--text-secondary);cursor:pointer;transition:all .15s;white-space:nowrap}.cat-btn:hover{border-color:var(--accent);color:var(--accent)}.cat-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}.pool-info{font-size:.78rem;color:var(--text-muted);text-align:center;margin-bottom:20px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px;margin-bottom:20px}.card-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.cat-tag{display:inline-block;font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:20px;background:var(--accent-light);color:var(--accent)}.card-num{font-size:.8rem;color:var(--text-muted);font-variant-numeric:tabular-nums}.status-hint{text-align:center;font-size:1rem;color:var(--text-secondary);margin-bottom:24px;min-height:28px}.audio-section{margin-bottom:24px}.audio-btns{display:flex;gap:10px;justify-content:center;margin-bottom:14px;flex-wrap:wrap}.btn-play{display:inline-flex;align-items:center;gap:6px;padding:11px 28px;font-size:.95rem;font-weight:600;border:none;border-radius:10px;background:var(--accent);color:#fff;cursor:pointer;transition:background .15s,transform .1s}.btn-play:hover{background:var(--accent-hover)}.btn-play:active{transform:scale(.97)}.btn-play.playing{background:#6366f1}.btn-secondary{display:inline-flex;align-items:center;gap:6px;padding:11px 20px;font-size:.9rem;font-weight:500;border:1.5px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text-secondary);cursor:pointer;transition:all .15s}.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}.speed-row{display:flex;align-items:center;justify-content:center;gap:8px}.speed-label{font-size:.8rem;color:var(--text-muted)}.speed-btn{padding:4px 14px;font-size:.8rem;font-weight:500;border:1.5px solid var(--border);border-radius:6px;background:var(--surface);color:var(--text-secondary);cursor:pointer;transition:all .15s}.speed-btn:hover{border-color:var(--accent);color:var(--accent)}.speed-btn.active{background:var(--accent-light);border-color:var(--accent);color:var(--accent);font-weight:600}.divider{height:1px;background:var(--border);margin:20px 0}.btn-reveal{display:block;width:100%;padding:13px;font-size:.9rem;font-weight:500;border:1.5px dashed var(--border);border-radius:10px;background:transparent;color:var(--text-secondary);cursor:pointer;transition:all .15s;text-align:center}.btn-reveal:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.question-block{animation:fadeIn .25s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.question-text{font-size:1.18rem;font-weight:600;color:var(--text-primary);line-height:1.5;margin-bottom:6px}.question-zh{font-size:.88rem;color:var(--text-muted);margin-bottom:20px}.meta-section{margin-bottom:14px}.meta-label{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted);margin-bottom:6px}.meta-content{font-size:.875rem;color:var(--text-secondary);line-height:1.7;white-space:pre-line}.answer-section{animation:fadeIn .25s ease}.answer-tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}.answer-tab{padding:7px 16px;font-size:.82rem;font-weight:500;border:1.5px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text-secondary);cursor:pointer;transition:all .15s}.answer-tab:hover{border-color:var(--accent);color:var(--accent)}.answer-tab.active{background:var(--accent);border-color:var(--accent);color:#fff}.answer-body{background:#f8faff;border:1px solid #dde5ff;border-radius:10px;padding:16px 18px}.answer-text{font-size:.88rem;color:var(--text-primary);line-height:1.85;white-space:pre-line}.answer-audio-row{display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap}.btn-answer-play{display:inline-flex;align-items:center;gap:6px;padding:9px 22px;font-size:.9rem;font-weight:600;border:1.5px solid var(--green);border-radius:10px;background:var(--green-bg);color:#16a34a;cursor:pointer;transition:all .15s}.btn-answer-play:hover{background:#dcfce7;border-color:#16a34a}.btn-answer-play:active{transform:scale(.97)}.btn-answer-play.playing{background:var(--green);border-color:var(--green);color:#fff}.btn-answer-replay{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;font-size:.88rem;font-weight:500;border:1.5px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text-secondary);cursor:pointer;transition:all .15s}.btn-answer-replay:hover{border-color:var(--green);color:#16a34a}.draw-row{display:flex;justify-content:center;margin-bottom:28px}.btn-draw{padding:14px 48px;font-size:1rem;font-weight:600;border:none;border-radius:12px;background:var(--accent);color:#fff;cursor:pointer;transition:background .15s,transform .1s,box-shadow .15s;box-shadow:0 4px 14px #4361ee59}.btn-draw:hover:not(:disabled){background:var(--accent-hover);box-shadow:0 6px 18px #4361ee73}.btn-draw:active:not(:disabled){transform:scale(.97)}.btn-draw:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.site-footer{text-align:center;font-size:.75rem;color:var(--text-muted)}@media (max-width: 500px){.page{padding:20px 12px 48px}.site-title{font-size:1.3rem}.card{padding:20px 16px}.question-text{font-size:1.05rem}.btn-draw{width:100%;padding:15px}.audio-btns{flex-direction:column;align-items:stretch}.btn-play,.btn-secondary{justify-content:center}.answer-audio-row{flex-direction:column;align-items:stretch}.btn-answer-play,.btn-answer-replay{justify-content:center}.cat-btn{font-size:.73rem;padding:5px 11px}}