:root{--navy:#082f49;--blue:#0369a1;--cyan:#06b6d4;--sky:#e0f2fe;--ink:#0f172a;--muted:#64748b;--line:#dbe4ee;--bg:#f4f7fb;--good:#15803d;--bad:#b91c1c;--amber:#b45309;--card:#fff;--safe-bottom:env(safe-area-inset-bottom,0px)}
.answer-box.fill-answer span{color:#dc2626;font-weight:800}
*{box-sizing:border-box}html{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}body{margin:0;min-height:100vh;padding-bottom:calc(76px + var(--safe-bottom));background:linear-gradient(180deg,#e7f5ff 0,#f4f7fb 300px)}button{font:inherit}.topbar{position:sticky;top:0;z-index:10;height:72px;padding:10px 16px calc(8px + env(safe-area-inset-top,0px));display:flex;align-items:center;gap:11px;color:#fff;background:var(--navy);box-shadow:0 2px 12px #082f4930}.topbar strong{display:block;font-size:18px}.topbar small{display:block;margin-top:2px;color:#bae6fd;font-size:12px}.brandmark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(145deg,#0891b2,#0ea5e9)}.icon-btn{margin-left:auto;width:40px;height:40px;border:1px solid #ffffff40;border-radius:12px;color:#fff;background:#ffffff18;font-size:24px}.bottom-nav{position:fixed;z-index:20;left:0;right:0;bottom:0;height:calc(66px + var(--safe-bottom));padding-bottom:var(--safe-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);box-shadow:0 -5px 18px #0f172a12}.bottom-nav button{border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:650}.bottom-nav span{display:block;font-size:22px;line-height:25px}.bottom-nav button.active{color:var(--blue)}main{max-width:760px;margin:0 auto;padding:18px 14px 28px}.hero{padding:20px;border-radius:22px;color:#fff;background:linear-gradient(135deg,#082f49,#075985 64%,#0891b2);box-shadow:0 12px 28px #07598538}.eyebrow{margin:0 0 5px;color:#a5f3fc;font-size:13px;font-weight:700;letter-spacing:.06em}.hero h1{margin:0;font-size:25px;line-height:1.35}.hero p{margin:8px 0 17px;color:#dbeafe;font-size:14px}.progress-line{height:8px;overflow:hidden;border-radius:9px;background:#ffffff30}.progress-line i{display:block;height:100%;border-radius:9px;background:#67e8f9}.progress-meta{display:flex;justify-content:space-between;margin-top:8px;font-size:12px;color:#dbeafe}.quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0 20px}.btn{min-height:48px;padding:11px 16px;border:0;border-radius:14px;font-weight:750;cursor:pointer}.btn.primary{color:#fff;background:var(--blue);box-shadow:0 6px 16px #0369a12d}.btn.secondary{color:var(--navy);background:#fff;border:1px solid #bae6fd}.btn.ghost{color:var(--blue);background:#eff8ff;border:1px solid #cdeafa}.btn.danger{color:var(--bad);background:#fef2f2}.btn:disabled{opacity:.48}.section-head{display:flex;align-items:end;justify-content:space-between;margin:18px 2px 10px}.section-head h2{margin:0;font-size:18px}.section-head small{color:var(--muted)}.category-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.cat-card{min-height:116px;padding:14px;border:1px solid var(--line);border-radius:17px;text-align:left;background:var(--card);box-shadow:0 4px 12px #0f172a09}.cat-card .num{display:inline-grid;place-items:center;width:28px;height:28px;margin-bottom:9px;border-radius:9px;color:var(--blue);background:var(--sky);font-size:13px;font-weight:800}.cat-card strong{display:block;line-height:1.35}.cat-card small{display:block;margin-top:5px;color:var(--muted)}.mini-progress{height:4px;margin-top:10px;border-radius:5px;background:#e2e8f0}.mini-progress i{display:block;height:100%;border-radius:5px;background:var(--cyan)}.panel{padding:18px;border:1px solid var(--line);border-radius:19px;background:#fff;box-shadow:0 5px 16px #0f172a0b}.empty{text-align:center;padding:44px 20px}.empty .big{font-size:46px}.empty h2{margin:8px 0}.empty p{color:var(--muted)}.quiz-head{display:flex;align-items:center;gap:10px;margin-bottom:13px}.quiz-head .back{width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--navy);font-size:22px}.quiz-title{min-width:0;flex:1}.quiz-title strong,.quiz-title small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.quiz-title small{margin-top:3px;color:var(--muted)}.favorite-btn{width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;color:#94a3b8;font-size:22px}.favorite-btn.on{color:#f59e0b;background:#fffbeb;border-color:#fde68a}.question-card{padding:20px;border:1px solid var(--line);border-radius:21px;background:#fff;box-shadow:0 8px 24px #0f172a0d}.type-chip{display:inline-flex;padding:5px 9px;border-radius:8px;color:var(--blue);background:var(--sky);font-size:12px;font-weight:800}.question-card h2{margin:14px 0 18px;font-size:19px;line-height:1.65}.option{display:flex;align-items:flex-start;gap:11px;width:100%;margin:9px 0;padding:13px;border:1.5px solid var(--line);border-radius:14px;text-align:left;background:#fff;color:var(--ink);line-height:1.5}.option b{flex:none;display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:#f1f5f9;color:var(--blue)}.option.selected{border-color:var(--blue);background:#f0f9ff}.option.correct{border-color:#86efac;background:#f0fdf4}.option.wrong{border-color:#fca5a5;background:#fef2f2}.answer-box{margin-top:16px;padding:14px;border-left:4px solid var(--cyan);border-radius:9px;background:#ecfeff;line-height:1.65}.answer-box strong{color:#155e75}.feedback{margin:14px 0 0;padding:12px;border-radius:11px;font-weight:700}.feedback.good{color:var(--good);background:#f0fdf4}.feedback.bad{color:var(--bad);background:#fef2f2}.quiz-actions{display:grid;grid-template-columns:1fr 1.6fr;gap:10px;margin-top:16px}.mastery{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:15px}.mastery .good{color:var(--good);background:#f0fdf4;border:1px solid #bbf7d0}.mastery .bad{color:var(--amber);background:#fffbeb;border:1px solid #fde68a}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:14px}.stat{padding:15px 8px;border:1px solid var(--line);border-radius:15px;text-align:center;background:#fff}.stat strong{display:block;font-size:22px;color:var(--navy)}.stat small{color:var(--muted)}.list-card{display:flex;align-items:center;gap:12px;width:100%;margin:9px 0;padding:14px;border:1px solid var(--line);border-radius:14px;text-align:left;background:#fff}.list-card b{flex:none;display:grid;place-items:center;width:36px;height:36px;border-radius:11px;color:var(--blue);background:var(--sky)}.list-card span{flex:1}.list-card small{display:block;margin-top:3px;color:var(--muted)}#toast{position:fixed;z-index:40;left:50%;bottom:90px;transform:translate(-50%,20px);max-width:88%;padding:10px 16px;border-radius:20px;color:#fff;background:#0f172add;opacity:0;pointer-events:none;transition:.22s}#toast.show{opacity:1;transform:translate(-50%,0)}
@media(min-width:620px){.category-grid{grid-template-columns:repeat(3,1fr)}main{padding-top:24px}.topbar{padding-left:max(16px,calc((100% - 730px)/2));padding-right:max(16px,calc((100% - 730px)/2))}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.catalog-head{display:flex;align-items:flex-start;gap:12px;margin-bottom:14px}.catalog-head .back{flex:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--navy);font-size:22px}.catalog-head p{margin:0 0 4px;color:var(--blue);font-size:13px;font-weight:800}.catalog-head h2{margin:0;font-size:20px;line-height:1.35}.catalog-head small{display:block;margin-top:5px;color:var(--muted)}.catalog-summary{padding:15px}.catalog-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:13px}.number-legend{display:flex;justify-content:center;gap:16px;margin:16px 0 10px;color:var(--muted);font-size:12px}.number-legend span{display:flex;align-items:center;gap:5px}.number-legend i{width:10px;height:10px;border-radius:50%;background:#e2e8f0}.number-legend i.done{background:#22c55e}.number-legend i.review{background:#f59e0b}.number-directory{display:grid;gap:11px}.number-group{padding:14px;border:1px solid var(--line);border-radius:17px;background:#fff;box-shadow:0 3px 12px #0f172a08}.number-group-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.number-group-head h3{margin:0;font-size:16px}.number-group-head small{color:var(--muted)}.number-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:10px}.number-btn{aspect-ratio:1;border:1.5px solid #cbd5e1;border-radius:50%;color:#475569;background:#f8fafc;font-weight:750}.number-btn.tried{color:#0369a1;border-color:#7dd3fc;background:#e0f2fe}.number-btn.done{color:#fff;border-color:#22c55e;background:#22c55e}.number-btn.review{color:#fff;border-color:#f59e0b;background:#f59e0b}.catalog-btn{flex:none;min-height:40px;padding:0 10px;border:1px solid #bae6fd;border-radius:11px;color:var(--blue);background:#f0f9ff;font-size:13px;font-weight:750}@media(min-width:520px){.number-grid{grid-template-columns:repeat(10,1fr)}}