:root{--bg: #f4f6fb;--card: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e8f0;--shadow: 0 10px 30px rgba(15, 23, 42, .08);--primary: #2563eb;--primary-weak: rgba(37, 99, 235, .12);--danger: #ef4444;--success: #16a34a;--warn: #f59e0b}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";color:var(--text);background:radial-gradient(1200px 600px at 20% 10%,#eaf0ff 0%,transparent 60%),radial-gradient(1000px 600px at 80% 0%,#efeaff 0%,transparent 50%),var(--bg)}a{color:inherit}button,input{font:inherit}.container{width:min(1100px,calc(100% - 32px));margin:0 auto;padding:28px 0 48px}.card{background:var(--card);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow)}.title{font-size:32px;letter-spacing:.2px;margin:0 0 10px}.subtitle{margin:0;color:var(--muted);line-height:1.6}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px;border-radius:14px;border:1px solid var(--border);background:#fff;cursor:pointer;-webkit-user-select:none;user-select:none;transition:transform .12s ease,box-shadow .12s ease,background .12s ease}.btn:hover{transform:translateY(-1px);box-shadow:0 10px 20px #0f172a14}.btn:active{transform:translateY(0);box-shadow:none}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.ghost{background:transparent}.btn.danger{background:#ef44441a;border-color:#ef444459;color:#991b1b}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none;box-shadow:none}.layout{display:grid;grid-template-columns:320px 1fr;gap:16px;align-items:start}@media(max-width:980px){.layout{grid-template-columns:1fr}}.panel{padding:14px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--border)}.stats{display:flex;flex-wrap:wrap;gap:10px 14px;align-items:center;color:var(--muted);font-size:14px}.stats b{color:var(--text)}.actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}.grid{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:8px;min-width:0;max-width:100%}@media(max-width:980px){.grid{grid-template-columns:repeat(10,minmax(0,1fr))}}.qbtn{height:36px;border-radius:12px;border:1px solid var(--border);background:#fbfdff;cursor:pointer;position:relative;min-width:0}.qbtn.answered{background:#e8efff;border-color:#c7d2fe}.qbtn.current{outline:2px solid var(--primary);outline-offset:2px}.qbtn.correct{background:#16a34a1a;border-color:#16a34a73}.qbtn.wrong{background:#ef44441a;border-color:#ef444473}.qbtn.unanswered{background:#64748b14;border-color:#64748b40;color:#334155}.qbtn .mark{position:absolute;right:6px;top:4px;font-size:12px}.questionCard{padding:16px}.qTitle{font-size:18px;margin:0 0 10px}.qStem{margin:0 0 14px;color:var(--text);line-height:1.65;white-space:pre-wrap}.imgWrap{margin:12px 0;display:flex;justify-content:center}.img{max-width:100%;max-height:360px;border-radius:14px;border:1px solid var(--border);cursor:zoom-in;background:#fff}.options{display:flex;flex-direction:column;gap:10px;margin:12px 0 6px}.option{display:flex;gap:10px;align-items:flex-start;padding:12px;border:1px solid var(--border);border-radius:14px;background:#fff}.option input{margin-top:2px}.optionLabel{line-height:1.55;white-space:pre-wrap}.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;border:1px solid var(--border);font-size:12px;color:var(--muted);background:#f8fafc}.badge.danger{color:#991b1b;border-color:#ef444473;background:#ef444414}.badge.success{color:#166534;border-color:#16a34a73;background:#16a34a14}.navRow{display:flex;justify-content:space-between;align-items:center;gap:10px;padding-top:14px;border-top:1px solid var(--border);margin-top:16px}.input{width:100%;padding:12px 14px;border-radius:14px;border:1px solid var(--border);background:#fff}.modalOverlay{position:fixed;inset:0;background:#02061799;display:flex;align-items:center;justify-content:center;padding:18px;z-index:50}.modal{width:min(1000px,100%);background:#fff;border-radius:16px;border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden}.modalHeader{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border-bottom:1px solid var(--border)}.modalBody{padding:12px;display:flex;justify-content:center;background:#0b1220}.modalBody img{max-width:100%;max-height:80vh;object-fit:contain}.resultHead{padding:18px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}.resultNums{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.muted{color:var(--muted)}