:root{--bg: #f4f6f8;--surface: #ffffff;--surface-2: #f0f3f6;--border: #e2e8f0;--border-strong: #cbd5e1;--text: #1a2733;--text-muted: #5a6b7b;--text-faint: #8595a5;--primary: #0d9488;--primary-dark: #0f766e;--primary-soft: #d7f0ec;--accent: #f59e0b;--pass: #16a34a;--pass-soft: #dcfce7;--fail: #dc2626;--fail-soft: #fee2e2;--shadow: 0 1px 2px rgba(16, 33, 48, .06), 0 4px 16px rgba(16, 33, 48, .06);--shadow-lg: 0 8px 40px rgba(16, 33, 48, .12);--radius: 14px;--radius-sm: 9px;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}@media (prefers-color-scheme: dark){:root{--bg: #0e151c;--surface: #172029;--surface-2: #1e2933;--border: #29343f;--border-strong: #3a4753;--text: #e8eef3;--text-muted: #a3b1bf;--text-faint: #6f7f8e;--primary: #2dd4bf;--primary-dark: #14b8a6;--primary-soft: #113631;--pass: #4ade80;--pass-soft: #10281a;--fail: #f87171;--fail-soft: #2b1414;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .45)}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.5}h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em}p{margin:0}button{font-family:inherit}.app-shell{max-width:1120px;margin:0 auto;padding:32px 24px 80px}.topbar{display:flex;align-items:center;gap:12px;margin-bottom:32px}.topbar .logo{width:40px;height:40px;border-radius:11px;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:800;font-size:20px;flex-shrink:0}.topbar .brand{font-size:19px;font-weight:700}.topbar .brand small{display:block;font-size:12.5px;color:var(--text-muted);font-weight:500;letter-spacing:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}.card+.card{margin-top:20px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:var(--radius-sm);padding:12px 22px;font-size:15px;font-weight:600;cursor:pointer;transition:transform .05s ease,background .15s ease,box-shadow .15s ease}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px #0d94884d}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{background:var(--border-strong);color:var(--text-faint);cursor:not-allowed;box-shadow:none}.btn-ghost{background:transparent;color:var(--text-muted);border-color:var(--border-strong)}.btn-ghost:hover{background:var(--surface-2);color:var(--text)}.btn-lg{padding:15px 30px;font-size:16px}.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:999px;font-size:12.5px;font-weight:600;background:var(--surface-2);color:var(--text-muted)}.pill-primary{background:var(--primary-soft);color:var(--primary-dark)}.hero h1{font-size:30px;margin-bottom:8px}.hero .subtitle{color:var(--text-muted);font-size:16px;max-width:620px}.spec-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin-top:4px}.spec{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px}.spec .label{font-size:12.5px;color:var(--text-faint);font-weight:600;text-transform:uppercase;letter-spacing:.04em}.spec .value{font-size:22px;font-weight:700;margin-top:4px}.spec .value small{font-size:13px;font-weight:500;color:var(--text-muted)}.rules{list-style:none;padding:0;margin:0;display:grid;gap:11px}.rules li{display:flex;gap:11px;align-items:flex-start;font-size:14.5px;color:var(--text-muted)}.rules li .tick{color:var(--primary);font-weight:800;flex-shrink:0;margin-top:1px}.section-title{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);font-weight:700;margin-bottom:14px}.domain-bar{display:flex;height:12px;border-radius:999px;overflow:hidden;margin:10px 0 14px}.domain-bar span{display:block;height:100%}.domain-legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px}.domain-legend .row{display:flex;align-items:center;gap:9px;font-size:13.5px}.domain-legend .dot{width:11px;height:11px;border-radius:3px;flex-shrink:0}.domain-legend .w{margin-left:auto;color:var(--text-muted);font-weight:600}.exam-wrap{max-width:860px;margin:0 auto;padding:24px;min-height:100vh;display:flex;flex-direction:column}.exam-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);position:sticky;top:16px;z-index:5}.exam-header .qnum{font-size:15px;font-weight:700}.exam-header .qnum small{color:var(--text-faint);font-weight:500}.timer{display:flex;align-items:center;gap:14px}.timer .clock{font-variant-numeric:tabular-nums;font-size:19px;font-weight:700;letter-spacing:.01em}.timer .clock.warn{color:var(--accent)}.timer .clock.danger{color:var(--fail)}.timer .clock.hidden-clock{color:var(--text-faint);letter-spacing:.1em}.link-btn{background:none;border:none;color:var(--text-faint);font-size:12.5px;cursor:pointer;padding:4px;text-decoration:underline}.link-btn:hover{color:var(--text-muted)}.question-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px;margin-top:20px;flex:1}.question-stem{font-size:19px;font-weight:600;line-height:1.5;margin-bottom:26px}.options{display:grid;gap:12px}.option{display:flex;align-items:flex-start;gap:14px;padding:16px 18px;border:1.5px solid var(--border-strong);border-radius:var(--radius-sm);cursor:pointer;transition:border-color .12s,background .12s;background:var(--surface)}.option:hover{border-color:var(--primary);background:var(--surface-2)}.option.selected{border-color:var(--primary);background:var(--primary-soft)}.option .marker{width:26px;height:26px;border-radius:50%;border:1.5px solid var(--border-strong);display:grid;place-items:center;font-size:13px;font-weight:700;flex-shrink:0;color:var(--text-muted);background:var(--surface);text-transform:uppercase}.option.selected .marker{background:var(--primary);border-color:var(--primary);color:#fff}.option .otext{font-size:15.5px;padding-top:2px}.exam-footer{display:flex;align-items:center;justify-content:space-between;margin-top:22px}.exam-footer .hint{font-size:13px;color:var(--text-faint);max-width:460px}.progress-thin{height:3px;background:var(--border);border-radius:2px;overflow:hidden;margin-top:14px}.progress-thin span{display:block;height:100%;background:var(--primary);transition:width .3s}.result-hero{text-align:center;padding:40px 26px}.result-badge{display:inline-flex;align-items:center;gap:10px;padding:8px 20px;border-radius:999px;font-size:15px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:20px}.result-badge.pass{background:var(--pass-soft);color:var(--pass)}.result-badge.fail{background:var(--fail-soft);color:var(--fail)}.score-big{font-size:72px;font-weight:800;line-height:1;letter-spacing:-.03em}.score-big .of{font-size:28px;color:var(--text-faint);font-weight:600}.score-caption{color:var(--text-muted);margin-top:10px;font-size:15px}.stop-note{margin-top:18px;font-size:14px;color:var(--text-muted);background:var(--surface-2);border-radius:var(--radius-sm);padding:12px 16px;display:inline-block;max-width:560px}.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:14px}.stat{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px}.stat .n{font-size:26px;font-weight:700}.stat .l{font-size:12.5px;color:var(--text-muted);margin-top:2px}.subscore{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid var(--border)}.subscore:last-child{border-bottom:none}.subscore .name{font-weight:600}.subscore .name small{display:block;color:var(--text-faint);font-weight:500;font-size:12.5px}.subscore .val{font-size:22px;font-weight:700}.review-item{border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;margin-bottom:10px}.review-item .rq{font-weight:600;font-size:15px;margin-bottom:10px}.review-item .ra{font-size:14px;padding:5px 0;display:flex;gap:8px;align-items:baseline}.review-item .ra .k{font-weight:700;text-transform:uppercase;width:18px;flex-shrink:0}.review-item .ra.correct{color:var(--pass)}.review-item .ra.wrong{color:var(--fail)}.tag{font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;text-transform:uppercase;letter-spacing:.03em}.tag.right{background:var(--pass-soft);color:var(--pass)}.tag.miss{background:var(--fail-soft);color:var(--fail)}.tag.pretest{background:var(--surface-2);color:var(--text-faint)}.history-row{display:flex;align-items:center;gap:14px;padding:12px 0;border-bottom:1px solid var(--border);font-size:14px}.history-row:last-child{border-bottom:none}.history-row .hdot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.muted{color:var(--text-muted)}.center{text-align:center}.flex-between{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a141e8c;display:grid;place-items:center;z-index:50;padding:24px}.modal{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:28px;max-width:440px;width:100%}.modal h3{font-size:20px;margin-bottom:10px}.modal p{color:var(--text-muted);font-size:14.5px}.modal-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}.chip{display:inline-flex;align-items:center;gap:8px;padding:9px 15px;border-radius:999px;font-size:13.5px;font-weight:600;border:1.5px solid var(--border-strong);background:var(--surface);color:var(--text-muted);cursor:pointer;transition:all .12s}.chip:hover{border-color:var(--primary)}.chip .dot{width:10px;height:10px;border-radius:3px}.chip-on{border-color:var(--primary);color:var(--primary-dark);background:var(--primary-soft)}.chip-primary.chip-on{background:var(--primary);color:#fff;border-color:var(--primary)}.opt-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}.opt-card{text-align:left;padding:16px 18px;border-radius:var(--radius-sm);border:1.5px solid var(--border-strong);background:var(--surface);cursor:pointer;transition:all .12s}.opt-card:hover:not(:disabled){border-color:var(--primary)}.opt-card.on{border-color:var(--primary);background:var(--primary-soft)}.opt-card:disabled{opacity:.45;cursor:not-allowed}.opt-card .oc-label{font-weight:600;font-size:14.5px}.opt-card .oc-note{font-size:12.5px;color:var(--text-faint);margin-top:3px}.option:disabled{cursor:default}.option.opt-correct{border-color:var(--pass);background:var(--pass-soft)}.option.opt-correct .marker{background:var(--pass);border-color:var(--pass);color:#fff}.option.opt-wrong{border-color:var(--fail);background:var(--fail-soft)}.option.opt-wrong .marker{background:var(--fail);border-color:var(--fail);color:#fff}.opt-flag{margin-left:auto;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.03em;align-self:center}.opt-flag.correct{color:var(--pass)}.opt-flag.wrong{color:var(--fail)}.feedback{margin-top:20px;padding:16px 18px;border-radius:var(--radius-sm);font-size:15px;border:1px solid var(--border)}.feedback.ok{background:var(--pass-soft);border-color:transparent}.feedback.no{background:var(--fail-soft);border-color:transparent}.explanation{margin-top:12px;font-size:14.5px;color:var(--text);line-height:1.55}.explanation-label{display:inline-block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--primary-dark);background:var(--surface);padding:2px 9px;border-radius:999px;margin-right:9px;vertical-align:middle}.explanation.muted-note{color:var(--text-muted);font-size:13.5px}.mode-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}.mode-card{text-align:left;padding:24px;border-radius:var(--radius);border:1.5px solid var(--border);background:var(--surface);cursor:pointer;transition:all .14s;box-shadow:var(--shadow)}.mode-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.mode-card .mc-icon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-size:22px;margin-bottom:14px}.mode-card h3{font-size:18px;margin-bottom:6px}.mode-card p{font-size:13.5px;color:var(--text-muted)}.mode-card .mc-go{margin-top:14px;font-weight:600;color:var(--primary-dark);font-size:14px}@media (max-width: 640px){.question-card{padding:22px}.question-stem{font-size:17px}.score-big{font-size:58px}.mode-cards{grid-template-columns:1fr}}