:root{--bg:#f5f7fb;--card:#fff;--text:#111827;--muted:#64748b;--line:#e5e7eb;--primary:#2563eb;--good:#059669;--bad:#dc2626;--warn:#b45309;--shadow:0 10px 28px rgba(15,23,42,.08);--radius:18px;--bottom:84px}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif}
body{padding-bottom:calc(var(--bottom) + env(safe-area-inset-bottom))}
button,input,select{font:inherit}button{border:0;background:none;color:inherit}
.app{max-width:680px;margin:0 auto;min-height:100vh}
.topbar{position:sticky;top:0;z-index:10;padding:12px 14px 10px;background:rgba(245,247,251,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(229,231,235,.8)}
.title-row{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.eyebrow{margin:0 0 3px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:800}h1{font-size:20px;line-height:1.2;margin:0}.badge{font-size:12px;font-weight:800;color:#3730a3;background:#e0e7ff;border-radius:999px;padding:6px 9px;white-space:nowrap}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:11px}.stats div{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:8px 4px;text-align:center;box-shadow:0 2px 8px rgba(15,23,42,.04)}.stats strong{display:block;font-size:16px}.stats span{display:block;margin-top:2px;color:var(--muted);font-size:11px}.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);transition:.25s}
.controls{padding:12px 14px 0}.controls input[type=search],.controls input[type=number],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}.grid.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:#374151;font-weight:700}.pending{margin-top:8px}.mode-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:9px}.mode{min-height:46px;border:1px solid var(--line);border-radius:15px;background:#fff;font-weight:900}.mode.active{background:var(--primary);border-color:var(--primary);color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.25)}.jump{display:grid;grid-template-columns:1fr 84px 96px;gap:8px;margin-top:9px}.jump button,.ghost{min-height:44px;border:1px solid var(--line);border-radius:14px;background:#fff;font-weight:800}.ghost{color:#334155}.card{margin:12px 14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.empty{padding:30px 16px;text-align:center;color:var(--muted);line-height:1.7}.meta-row{padding:13px 13px 0;display:flex;justify-content:space-between;align-items:flex-start;gap:8px}.pill{display:inline-flex;align-items:center;min-height:28px;border-radius:999px;background:#111827;color:#fff;padding:0 9px;font-size:12px;font-weight:800;margin:0 4px 6px 0}.pill.soft{background:#eef2ff;color:#3730a3}.pill.warn{background:#fef3c7;color:#92400e}.fav{min-width:76px;min-height:36px;border-radius:999px;border:1px solid var(--line);background:#fff;font-weight:900}.fav.on{background:#fef3c7;border-color:#f59e0b;color:#92400e}h2{font-size:19px;line-height:1.55;margin:9px 14px 14px}.options{display:grid;gap:10px;padding:0 14px 14px}.opt{width:100%;display:flex;align-items:flex-start;gap:10px;text-align:left;border:1.5px solid var(--line);border-radius:16px;background:#fff;padding:13px;line-height:1.45;font-size:16px}.opt:active{transform:scale(.99)}.letter{width:29px;height:29px;border-radius:999px;display:flex;align-items:center;justify-content:center;flex-shrink:0;background:#f1f5f9;color:#334155;font-weight:900}.opt.selected{border-color:#2563eb;background:#eff6ff}.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:calc(100% - 28px);margin:0 14px 14px}.primary{background:var(--primary)!important;color:#fff!important}.light{background:#eef2ff!important;color:#1e3a8a!important}.submit,.primary.full{min-height:48px;border-radius:15px;font-weight:900}.answer{margin:0 14px 14px;padding:13px;border:1px solid var(--line);border-radius:16px;background:#f8fafc}.result{font-size:17px;font-weight:900;margin-bottom:8px}.result.good{color:var(--good)}.result.bad{color:var(--bad)}.answer-line{line-height:1.7;margin-bottom:10px}.analysis-block{border-top:1px dashed #cbd5e1;padding-top:10px}.analysis-block pre{white-space:pre-wrap;font-family:inherit;line-height:1.72;font-size:15px;color:#334155;margin:8px 0 0}.memory{background:#fffbeb;border:1px solid #fde68a;border-radius:13px;padding:10px;margin-top:11px;color:#78350f;line-height:1.65}.memory p{margin:6px 0 0}.source{font-size:13px;color:var(--muted);margin-top:10px}.number-panel{padding:0 14px 12px}.number-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:7px;margin-top:9px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px;max-height:280px;overflow:auto}.num{min-height:38px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:12px;font-weight:800}.num.current{background:#111827;color:#fff}.num.done{background:#dbeafe;border-color:#93c5fd}.num.wrong{background:#fee2e2;border-color:#fca5a5}.num.fav{box-shadow:inset 0 0 0 2px #f59e0b}.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);padding:10px 12px calc(10px + env(safe-area-inset-bottom));display:grid;grid-template-columns:1fr 1fr 1fr;gap:9px;max-width:680px;margin:0 auto}.bottom button{min-height:54px;border-radius:16px;background:#111827;color:#fff;font-weight:900}.toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);z-index: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){h2{font-size:18px}.opt{font-size:15px;padding:12px 11px}.jump{grid-template-columns:1fr 74px 86px}.number-grid{grid-template-columns:repeat(6,1fr)}}