:root{--bg:#0f1422;--bg-soft:#151b2e;--card:#1b2238;--card-2:#222b45;--line:#2c3553;--text:#e7ecf6;--muted:#9aa6c4;--brand:#4f8cff;--brand-2:#6f5cff;--ok:#34d399;--warn:#fbbf24;--bad:#f87171;--radius:12px;--shadow:0 10px 30px rgba(0,0,0,.35)}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;background:radial-gradient(1200px 600px at 80% -10%,#1d2742 0%,var(--bg) 55%);color:var(--text);font-size:15px;line-height:1.5}a{color:var(--brand);text-decoration:none}#app{min-height:100%;display:flex;flex-direction:column}.boot{display:grid;place-items:center;height:100vh;color:var(--muted)}.spin{width:28px;height:28px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;animation:sp 1s linear infinite;margin-bottom:12px}@keyframes sp{to{transform:rotate(360deg)}}.topbar{display:flex;align-items:center;gap:12px;padding:12px 20px;background:rgba(20,27,46,.8);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30;backdrop-filter:blur(8px)}.brand{font-weight:700;letter-spacing:.5px;display:flex;align-items:center;gap:10px}.logo{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:inline-block}.topbar .spacer{flex:1}.wrap{width:100%;max-width:1080px;margin:0 auto;padding:22px 20px 80px;flex:1}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}@media (max-width:820px){.grid2,.grid3{grid-template-columns:1fr}}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}.card h3{margin:0 0 12px;font-size:16px}.muted{color:var(--muted)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.small{font-size:13px}.pill{display:inline-flex;align-items:center;gap:6px;padding:2px 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16px;font-weight:600;background:var(--brand);color:#fff;transition:filter .15s,transform .05s}button:hover{filter:brightness(1.07)}button:active{transform:translateY(1px)}button.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}button.ghost:hover{background:var(--card-2)}button.danger{background:var(--bad)}button.ok{background:var(--ok);color:#06281d}button:disabled{opacity:.5;cursor:not-allowed}.btn-row{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.5px}tbody tr:hover{background:rgba(255,255,255,.02)}.tnum{font-variant-numeric:tabular-nums;text-align:right}.auth{min-height:100vh;display:grid;place-items:center;padding:20px}.auth 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12px;border-radius:9px;background:var(--bg-soft);border:1px solid var(--line)}.ans .tag{font-size:12px;color:var(--muted)}.examhead{position:sticky;top:0;z-index:20;background:rgba(15,20,34,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);padding:12px 20px;display:flex;align-items:center;gap:14px}.timer{font-variant-numeric:tabular-nums;font-size:20px;font-weight:700;padding:6px 14px;border-radius:10px;background:var(--card-2);border:1px solid var(--line)}.timer.warn{color:var(--warn);border-color:rgba(251,191,36,.5)}.timer.bad{color:#fff;background:var(--bad);border-color:var(--bad);animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.65}}.progress{flex:1;height:8px;background:var(--bg-soft);border-radius:999px;overflow:hidden}.progress>i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand-2))}.scorebig{font-size:44px;font-weight:800;font-variant-numeric:tabular-nums}.verdict{font-size:18px;font-weight:700}.item{border-top:1px solid var(--line);padding:14px 0}.item .qline{display:flex;gap:10px;align-items:baseline}.kbadge{font-size:11px;padding:1px 8px;border-radius:6px;background:var(--card-2);color:var(--muted)}.ok-t{color:var(--ok)}.bad-t{color:var(--bad)}.fadein{animation:fade .25s ease}@keyframes fade{from{opacity:0;transform:translateY(6px)}}.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);background:var(--card-2);border:1px solid var(--line);color:var(--text);padding:12px 18px;border-radius:10px;box-shadow:var(--shadow);z-index:100;max-width:90vw}.toast.err{border-color:var(--bad);color:#ffd7d7}.toast.ok{border-color:var(--ok);color:#d6ffe9}.hide{display:none !important}.tagrow{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}.statbox{display:grid;place-items:center;padding:14px;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px}.statbox b{font-size:22px;font-variant-numeric:tabular-nums}.filezone{border:1.5px dashed var(--line);border-radius:12px;padding:18px;text-align:center;color:var(--muted);cursor:pointer;transition:border-color .15s,background .15s}.filezone:hover,.filezone.drag{border-color:var(--brand);background:rgba(79,140,255,.06)}.kbd{font-family:ui-monospace,monospace;background:var(--bg-soft);border:1px solid var(--line);padding:1px 6px;border-radius:6px;font-size:12px}pre.sample{background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:12px;overflow:auto;font-size:12px;max-height:320px}.nav a{padding:6px 12px;border-radius:8px;color:var(--muted)}.nav a.active,.nav a:hover{background:var(--card-2);color:var(--text)}