:root{--navy:#19365d;--teal:#009688;--ink:#273444;--muted:#687585;--bg:#f4f7fa;--card:#fff;--good:#16834a;--bad:#c63d43;--gold:#f3b93d}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 10% 0,#dcecf0 0,transparent 36%),var(--bg);color:var(--ink);font-family:Segoe UI,Arial,sans-serif}.wrap{max-width:1080px;margin:0 auto;padding:24px}.top{background:linear-gradient(135deg,var(--navy),#2d315f);color:#fff;border-radius:24px;padding:28px 30px;margin-bottom:18px;box-shadow:0 18px 45px #19365d2b}.top h1{margin:0 0 6px;font-size:clamp(25px,4vw,34px)}.top p{margin:0;opacity:.88}.meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:18px;font-size:14px;font-weight:700}.timer{display:inline-flex;align-items:center;gap:6px;color:#fff}.timer.warning{color:#ffd273}.bar{height:9px;background:#ffffff24;border-radius:8px;overflow:hidden;margin:18px 0 0}.fill{height:100%;background:#42d5c5;width:0;transition:.3s}.card{background:var(--card);border-radius:22px;padding:30px;box-shadow:0 14px 40px #19365d18}.qno{color:var(--teal);font-weight:800;font-size:14px;letter-spacing:.05em;text-transform:uppercase}.question{font-size:clamp(21px,3vw,26px);line-height:1.4;margin:12px 0 24px;font-weight:700}.option{display:block;width:100%;text-align:left;border:2px solid #d9e1e9;background:#fff;border-radius:13px;padding:15px 17px;margin:11px 0;font-size:17px;color:var(--ink);cursor:pointer;transition:.16s}.option:hover:not(:disabled){border-color:var(--teal);background:#f0fbf9;transform:translateX(2px)}.option.correct{border-color:var(--good);background:#eaf8f0;color:#0d6739}.option.wrong{border-color:var(--bad);background:#fff0f0;color:#9f2630}.option:disabled{cursor:default}.feedback{min-height:30px;margin:18px 0 0;font-weight:750}.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.explanation{margin-top:14px;border-left:4px solid var(--teal);border-radius:10px;background:#f1f8f7;padding:14px 16px;color:#415263;line-height:1.55;white-space:pre-line}.explanation strong{color:var(--navy)}.actions{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin-top:24px}.action-group{display:flex;flex-wrap:wrap;gap:10px}.btn{border:0;border-radius:11px;padding:12px 17px;font-size:15px;font-weight:800;cursor:pointer}.btn.primary{background:var(--teal);color:#fff}.btn.secondary{background:#e7edf3;color:var(--navy)}.btn.skip{background:#fff4d8;color:#785600}.btn:disabled{opacity:.45;cursor:not-allowed}.result{text-align:center}.score{font-size:54px;color:var(--teal);font-weight:850;margin:12px}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;max-width:560px;margin:22px auto}.result-stat{background:#f2f6f9;border-radius:14px;padding:14px}.result-stat strong{display:block;font-size:24px;color:var(--navy)}footer{text-align:center;color:var(--muted);font-size:12px;padding:18px;line-height:1.6}.back{display:inline-flex;color:var(--navy);text-decoration:none;font-weight:800;margin-bottom:18px}.section-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.section-card{border:1px solid #d9e1e9;background:#fff;border-radius:17px;padding:21px;text-align:left;cursor:pointer;transition:.2s}.section-card:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 12px 30px #19365d18}.section-card h2{margin:8px 0;font-size:20px;color:var(--navy)}.section-card p{margin:0;color:var(--muted);line-height:1.5}.section-tag{font-size:12px;font-weight:800;color:var(--teal);text-transform:uppercase;letter-spacing:.08em}.best{display:inline-block;margin-top:14px;border-radius:999px;background:#edf7f6;padding:6px 10px;color:#087a70;font-size:12px;font-weight:800}.source-note{margin-top:7px;font-size:12px;color:var(--muted)}
@media(max-width:640px){.wrap{padding:12px}.top{padding:21px}.card{padding:20px}.section-grid{grid-template-columns:1fr}.result-grid{grid-template-columns:1fr}.actions,.action-group{width:100%}.btn{flex:1}.meta{justify-content:flex-start}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.question,.option,.feedback,.explanation,.section-card{overflow-wrap:anywhere}.option{min-height:48px}.btn{min-height:46px}.source-note a{color:var(--teal);font-weight:700}