:root{--ink:#182b38;--muted:#647887;--blue:#146c94;--blue2:#0d4d6c;--bg:#f3f6f8;--card:#fff;--line:#d9e2e8;--good:#137a50;--bad:#b43b3b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}.shell{max-width:1040px;margin:auto;padding:24px}.brand{letter-spacing:.08em;text-transform:uppercase;color:var(--blue);font-weight:800;font-size:13px}.title{font-size:clamp(28px,4vw,45px);line-height:1.08;margin:8px 0}.sub{color:var(--muted);max-width:880px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 10px 28px #14384d0b}.controls{display:grid;grid-template-columns:1fr;gap:14px;margin-top:20px;max-width:480px}.field label{display:block;color:var(--muted);font-size:13px;font-weight:700;margin-bottom:6px}.field select,.btn{width:100%;border:1px solid var(--line);border-radius:11px;padding:12px 14px;background:#fff;color:var(--ink);font:inherit}.btn{cursor:pointer;font-weight:750}.btn.primary{background:var(--blue);color:#fff;border-color:var(--blue)}.actions{display:flex;gap:10px;margin-top:20px}.actions .btn{max-width:280px}.hidden{display:none!important}.status{display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-size:14px;margin-bottom:9px}.bar{height:9px;background:#e4edf1;border-radius:99px;overflow:hidden}.fill{height:100%;background:var(--blue);transition:width .25s}.qhead{display:flex;justify-content:space-between;gap:14px;align-items:center;margin:22px 0 8px}.badge{display:inline-flex;padding:5px 10px;border-radius:99px;background:#eaf4f8;color:var(--blue2);font-size:12px;font-weight:800}.question{font-size:22px;line-height:1.28;margin:12px 0 20px}.options{display:grid;gap:10px}.option{text-align:left;display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);background:#fff;padding:14px;border-radius:12px;cursor:pointer;font:inherit;color:var(--ink)}.option:hover{border-color:var(--blue);background:#f8fcfd}.letter{font-weight:800;color:var(--blue);min-width:24px}.option.correct{border-color:var(--good);background:#edf9f3}.option.wrong{border-color:var(--bad);background:#fff1f1}.option.disabled{cursor:default}.feedback{margin-top:16px;padding:16px;border-radius:12px;background:#f1f6f8}.feedback.good{background:#edf9f3;color:#125f3e}.feedback.bad{background:#fff1f1;color:#8c2b2b}.feedback p{margin:10px 0 0;color:var(--ink)}.nav{display:flex;justify-content:space-between;gap:12px;margin-top:22px}.nav .btn{max-width:220px}.score{font-size:42px;font-weight:850;color:var(--blue);margin:4px 0}.summary,.small{color:var(--muted)}.small{font-size:13px}.review{margin-top:18px;display:grid;gap:10px;max-height:520px;overflow:auto}.review-item{padding:13px;border:1px solid var(--line);border-radius:12px}.review-item strong{display:block;margin-bottom:4px}.tag{display:inline-block;margin:5px 5px 0 0;padding:5px 9px;border-radius:999px;background:#eef3f5;font-size:12px;color:#48606e}.footer{color:var(--muted);font-size:13px;margin-top:18px}@media(max-width:700px){.shell{padding:15px}.card{padding:18px}.question{font-size:20px}.actions,.nav{flex-direction:column}.actions .btn,.nav .btn{max-width:none}}