:root{color-scheme:light;--font-display: "Chivo", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--bg: #e9e0cc;--surface: #f1ead8;--card: #faf6ea;--ink: #062b8a;--muted: #5a6aa0;--accent: #062b8a;--accent-strong: #041f63;--accent-ink: #f1ead8;--border: rgba(6, 43, 138, .16);--ok: #1c7a45;--ok-soft: rgba(28, 122, 69, .12);--bad: #b2382c;--bad-soft: rgba(178, 56, 44, .12);--warn: #b45309;--warn-soft: rgba(180, 83, 9, .13);--stage: #062b8a;--stage-ink: #f4eee0;--stage-soft: rgba(244, 238, 224, .74);--stage-line: rgba(244, 238, 224, .24);--cat-常识: #0e5fa8;--cat-科学: #1c7a45;--cat-历史: #b45309;--cat-地理: #0f766e;--radius-card: 16px;--shadow-float: 0 10px 30px rgba(6, 20, 60, .16)}@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg: #0b1020;--surface: #131a30;--card: #1a2140;--ink: #e9e6db;--muted: #9aa7cc;--accent: #8fa4ff;--accent-strong: #aab9ff;--accent-ink: #0b1020;--border: rgba(255, 255, 255, .1);--ok: #4fd68a;--ok-soft: rgba(79, 214, 138, .14);--bad: #ff8d7d;--bad-soft: rgba(255, 141, 125, .14);--warn: #ffc05c;--warn-soft: rgba(255, 192, 92, .13);--stage: #222b50;--stage-ink: #f0efe8;--stage-soft: rgba(240, 239, 232, .72);--stage-line: rgba(240, 239, 232, .18);--cat-常识: #7fb2ff;--cat-科学: #4fd68a;--cat-历史: #ffc05c;--cat-地理: #5ee0d0;--shadow-float: 0 12px 32px rgba(0, 0, 0, .45)}}*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);line-height:1.55;-webkit-text-size-adjust:100%}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}.page{max-width:760px;margin:0 auto;padding:20px 20px calc(72px + env(safe-area-inset-bottom,0px))}.logo{position:relative;padding-left:28px;font-family:var(--font-display);font-size:1.5rem;font-weight:800;letter-spacing:-.02em;margin:8px 0 18px;line-height:1.2}.logo:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:18px;height:18px;border-radius:5px;background:var(--accent)}.logo:after{content:"";position:absolute;left:5px;top:50%;transform:translateY(-50%);width:8px;height:8px;border-radius:2px;background:var(--accent-ink)}.top-nav{display:flex;gap:4px;background:var(--surface);border-radius:999px;padding:4px;margin-bottom:20px}.top-nav .chip{flex:1 1 auto;border:none;background:transparent;color:var(--muted);font-weight:700;padding:9px 12px;border-radius:999px;min-height:40px;white-space:nowrap;transition:background-color .18s ease,color .18s ease}.top-nav .chip:hover:not(.active){background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--ink)}.top-nav .chip.active{background:var(--accent);color:var(--accent-ink)}.card{background:var(--card);border-radius:var(--radius-card);padding:22px;margin-bottom:18px}.card>h2:not(.stem){display:flex;align-items:center;gap:9px;margin:0 0 14px;font-size:1.06rem;font-weight:800;letter-spacing:-.01em}.card>h2:not(.stem):before{content:"";flex:0 0 auto;width:5px;height:16px;border-radius:3px;background:var(--accent)}h2{margin:0}p{margin:6px 0}.label{color:var(--muted);margin:18px 0 8px;font-size:.9rem;font-weight:700}.hint{color:var(--muted);font-size:.85rem;margin:10px 0 0}.btn-group{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1.5px solid var(--border);background:transparent;color:var(--ink);padding:8px 16px;border-radius:999px;cursor:pointer;font-size:.92rem;font-weight:600;min-height:40px;transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .06s ease}.chip:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 6%,transparent)}.chip:active:not(:disabled){transform:scale(.97)}.chip.active{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.chip:disabled{opacity:.42;cursor:not-allowed}.primary,.ghost,.danger{display:block;width:100%;padding:12px 20px;border-radius:999px;font-size:1rem;font-weight:700;cursor:pointer;min-height:46px;transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .06s ease}.primary{border:none;background:var(--accent);color:var(--accent-ink)}.primary:hover:not(:disabled){background:var(--accent-strong)}.primary:active:not(:disabled){transform:scale(.98)}.primary:disabled{opacity:.5;cursor:not-allowed}.ghost{border:1.5px solid var(--accent);background:transparent;color:var(--accent)}.ghost:hover:not(:disabled){background:color-mix(in srgb,var(--accent) 8%,transparent)}.ghost:active:not(:disabled){transform:scale(.98)}.danger{border:1.5px solid var(--bad);background:transparent;color:var(--bad)}.danger:hover:not(:disabled){background:var(--bad-soft)}.danger:active:not(:disabled){transform:scale(.98)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.actions>*{flex:1 1 180px;width:auto;margin-top:0}.nick-input{width:100%;padding:12px 16px;border:1.5px solid var(--border);border-radius:14px;background:var(--card);color:var(--ink);font-size:1rem;min-height:48px;transition:border-color .15s ease}.nick-input::placeholder{color:var(--muted);opacity:.75}.nick-input:focus{border-color:var(--accent);outline:3px solid color-mix(in srgb,var(--accent) 18%,transparent);outline-offset:0}.banner{border-radius:14px;padding:12px 16px;font-size:.9rem;font-weight:500;margin-bottom:16px}.banner.warn{background:var(--warn-soft);border:1.5px solid color-mix(in srgb,var(--warn) 35%,transparent);color:color-mix(in srgb,var(--warn) 80%,var(--ink))}.practice-banner{background:var(--warn-soft);color:color-mix(in srgb,var(--warn) 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0;width:100%;background:var(--accent);transition:width .1s linear,background-color .2s ease}.countdown-fill.warn{background:var(--bad);animation:countdown-pulse 1s ease-in-out infinite}.countdown-text{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:var(--bg);color:var(--ink);border-radius:999px;padding:0 12px;font-family:var(--font-display);font-size:.76rem;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.6;white-space:nowrap}.card.stage{background:var(--stage);color:var(--stage-ink)}.card.stage :focus-visible{outline-color:var(--stage-ink)}.q-meta{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap}.tag{font-size:.78rem;font-weight:700;padding:4px 12px;border-radius:999px;background:color-mix(in srgb,var(--accent) 9%,transparent);color:var(--accent);white-space:nowrap;letter-spacing:.01em}.tag-常识{background:color-mix(in srgb,var(--cat-常识) 12%,transparent);color:var(--cat-常识)}.tag-科学{background:color-mix(in srgb,var(--cat-科学) 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srgb,var(--accent) 6%,var(--surface))}.option:active:not(:disabled){transform:scale(.99)}.option:disabled{cursor:default;opacity:.95}.opt-key{flex:0 0 auto;width:28px;height:28px;border-radius:50%;border:1.5px solid var(--border);display:inline-flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:.8rem;font-weight:700;color:var(--muted);background:var(--card)}.opt-text{flex:1 1 auto;overflow-wrap:anywhere}.option.correct{border-color:var(--ok);background:var(--ok-soft);color:var(--ok);font-weight:700}.option.correct .opt-key{border-color:var(--ok);color:var(--ok);background:var(--card)}.option.wrong{border-color:var(--bad);background:var(--bad-soft);color:var(--bad);font-weight:700}.option.wrong .opt-key{border-color:var(--bad);color:var(--bad);background:var(--card)}.card.stage .tag{background:var(--stage-line);color:var(--stage-ink)}.card.stage .tag-常识{background:#7fb2ff2e;color:#a8c8ff}.card.stage .tag-科学{background:#4fd68a2e;color:#7be0a2}.card.stage .tag-历史{background:#ffc05c2e;color:#ffd88a}.card.stage .tag-地理{background:#5ee0d02e;color:#8ceade}.card.stage .tag-diff-1{background:#4fd68a2e;color:#7be0a2}.card.stage .tag-diff-2{background:#ffc05c2e;color:#ffd88a}.card.stage .tag-diff-3{background:#ff8d7d2e;color:#ffb3a6}.card.stage .tag-limit{color:var(--stage-ink)}.card.stage .tag-practice{background:#ffc05c2e;color:#ffd88a}.card.stage .option{background:#ffffff0f;border-color:var(--stage-line);color:var(--stage-ink)}.card.stage .option:hover:not(:disabled){background:#ffffff21;border-color:#ffffff8c}.card.stage .opt-key{border-color:var(--stage-line);color:var(--stage-soft);background:transparent}.card.stage .option.correct{background:var(--ok);border-color:var(--ok);color:#fff}.card.stage .option.correct .opt-key{border-color:#ffffffa6;color:#fff;background:transparent}.card.stage .option.wrong{background:var(--bad);border-color:var(--bad);color:#fff}.card.stage 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.review-mark{background:var(--ok-soft);color:var(--ok)}.review-item.bad .review-mark{background:var(--bad-soft);color:var(--bad)}.review-stem{font-weight:700;flex:1 1 200px;overflow-wrap:anywhere}.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin-top:8px}.records{width:100%;border-collapse:separate;border-spacing:0;font-size:.92rem}.records.wide{min-width:480px}.records th,.records td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--border);white-space:nowrap}.records tr:last-child td{border-bottom:none}.records th{color:var(--muted);font-weight:700;font-size:.82rem}.records tbody tr:hover td{background:color-mix(in srgb,var(--accent) 4%,transparent)}.records tr.me td{background:var(--accent);color:var(--accent-ink);font-weight:700}.records tr.me td:first-child{border-radius:10px 0 0 10px}.records tr.me td:last-child{border-radius:0 10px 10px 0}.records td .empty{white-space:normal}.empty{text-align:center;padding:30px 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env(safe-area-inset-bottom,0px))}.logo{font-size:1.25rem;margin:6px 0 14px}.card{padding:16px;border-radius:14px}.stem{font-size:1.15rem}.score-big{font-size:clamp(2.6rem,15vw,3.4rem)}.stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.top-nav{flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;scrollbar-width:none}.top-nav::-webkit-scrollbar{display:none}.top-nav .chip{flex:0 0 auto;min-width:88px}.quiz-nav .primary,.quiz-nav .ghost{flex:1 1 100%}.countdown{height:22px}}@media(prefers-color-scheme:dark){.card.stage .option.correct{background:var(--ok);border-color:var(--ok);color:#0b1020}.card.stage .option.wrong{background:var(--bad);border-color:var(--bad);color:#0b1020}.card.stage .option.correct .opt-key,.card.stage .option.wrong .opt-key{border-color:#00000059;color:#0b1020}.card.stage .primary:hover,.toast.ok,.toast.bad{color:#0b1020}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-delay:0ms!important;transition-duration:.001ms!important}}