:root{--bg:#f6f7fb;--card:#fff;--text:#111827;--muted:#64748b;--line:#e5e7eb;--primary:#2563eb;--good:#059669;--bad:#dc2626;--warn:#d97706;--soft:#eff6ff;--shadow:0 10px 30px rgba(15,23,42,.08);--bottom:86px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;padding-bottom:calc(var(--bottom) + env(safe-area-inset-bottom))}button,input,select{font:inherit}button{border:0}.app{max-width:720px;margin:0 auto}.topbar{position:sticky;top:0;z-index:10;background:rgba(246,247,251,.94);backdrop-filter:blur(16px);padding:12px 14px;border-bottom:1px solid var(--line)}.title-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.eyebrow{margin:0 0 4px;color:var(--primary);font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}h1{margin:0;font-size:20px}.badge,.pill{border-radius:999px;padding:5px 9px;font-size:12px;font-weight:800}.badge{background:#e0e7ff;color:#3730a3;white-space:nowrap}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:10px}.stats div{background:var(--card);border:1px solid var(--line);border-radius:13px;text-align:center;padding:7px 4px;box-shadow:0 2px 10px rgba(15,23,42,.04)}.stats strong{display:block}.stats span{display:block;color:var(--muted);font-size:10px}.progress{height:8px;background:#e5e7eb;border-radius:999px;overflow:hidden;margin-top:10px}.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,#2563eb,#22c55e)}.controls{padding:12px 14px 0}.controls input,.controls select{width:100%;min-height:44px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:0 12px;outline:none}.grid{display:grid;gap:8px;margin-top:8px}.two{grid-template-columns:1fr 1fr}.switch{min-height:44px;display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:0 12px;color:#334155;font-weight:700}.pending{margin-top:8px}.mode-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}.mode,.jump button,.ghost,.primary{min-height:44px;border-radius:14px;font-weight:900}.mode{background:#fff;border:1px solid var(--line)}.mode.active,.primary{background:var(--primary);color:#fff}.jump{display:grid;grid-template-columns:1fr 80px 96px;gap:8px;margin-top:8px}.ghost{background:#fff;border:1px solid var(--line);color:#334155}.card{margin:12px 14px;background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:14px}.meta-row{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}.pill{display:inline-flex;background:#111827;color:#fff;margin:0 4px 6px 0}.pill.soft{background:#eef2ff;color:#1e3a8a}.pill.warn{background:#fef3c7;color:#92400e}.fav{border-radius:999px;background:#fff7ed;color:#b45309;border:1px solid #fed7aa;padding:8px 10px;font-weight:800;white-space:nowrap}h2{font-size:18px;line-height:1.55}.options{display:grid;gap:10px}.opt{width:100%;display:flex;gap:10px;text-align:left;border:1.5px solid var(--line);background:#fff;border-radius:16px;padding:12px;line-height:1.45}.letter{width:28px;height:28px;border-radius:999px;background:#f1f5f9;display:flex;align-items:center;justify-content:center;font-weight:900;flex-shrink:0}.opt.selected{border-color:var(--primary);background:var(--soft)}.opt.correct{border-color:#16a34a;background:#dcfce7}.opt.correct .letter{background:#16a34a;color:#fff}.opt.wrong{border-color:#ef4444;background:#fee2e2}.opt.wrong .letter{background:#ef4444;color:#fff}.full{width:100%;margin-top:12px}.answer{margin-top:14px;border-radius:16px;background:#f8fafc;border:1px solid var(--line);padding:12px}.result{font-weight:900;margin-bottom:8px}.result.good{color:var(--good)}.result.bad{color:var(--bad)}.answer-line{line-height:1.6}.analysis-block{border-top:1px dashed #cbd5e1;margin-top:10px;padding-top:10px}.analysis-block pre{white-space:pre-wrap;margin:8px 0 0;font-family:inherit;line-height:1.7;color:#334155}.memory{background:#fffbeb;border:1px solid #fde68a;border-radius:13px;margin-top:10px;padding:10px;color:#78350f}.memory p{margin:6px 0 0;line-height:1.6}.source{font-size:13px;color:var(--muted);margin-top:8px}.empty{text-align:center;color:var(--muted);padding:34px 10px}.number-panel{padding:0 14px 14px}.number-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:8px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px}.num{min-height:36px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:12px;font-weight:800}.num.cur{background:#111827;color:#fff}.num.done{background:#dbeafe}.num.wrong{background:#fee2e2}.bottom{position:fixed;left:0;right:0;bottom:0;z-index:20;background:rgba(255,255,255,.96);border-top:1px solid var(--line);backdrop-filter:blur(16px);display:grid;grid-template-columns:1fr 1.1fr 1fr;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom))}.bottom button{min-height:52px;border-radius:16px;font-weight:900}.bottom .light{background:#eef2ff;color:#1e3a8a}.toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);background:rgba(17,24,39,.92);color:#fff;border-radius:999px;padding:12px 20px;font-weight:900;display:none}.toast.show{display:block}@media(max-width:390px){.jump{grid-template-columns:1fr 70px 86px}.number-grid{grid-template-columns:repeat(6,1fr)}h2{font-size:17px}}