*{box-sizing:border-box}
:root{--red:#c92720;--ink:#20242a;--muted:#68717d;--line:#e1e5ea;--bg:#f3f5f7;--green:#147d45}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}
header{background:#d9231c;color:#fff;padding:22px max(18px,calc((100% - 960px)/2))}
.brand{display:flex;flex-direction:column;gap:2px;margin-bottom:18px}.brand b{letter-spacing:.12em;font-size:.82rem}.brand span{opacity:.92}
.topicbar{background:#a91c18;border:1px solid #ffffff38;border-radius:12px;padding:14px 16px;display:flex;flex-direction:column;gap:3px}
.topicbar b{font-size:.78rem;letter-spacing:.09em}.topicbar span{font-weight:800;font-size:1.15rem}.topicbar small{opacity:.9}
main{max-width:960px;margin:24px auto;padding:0 16px 40px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;margin-bottom:16px;box-shadow:0 2px 9px #1b24300a}
h1{font-size:1.8rem;margin:0 0 8px}h2{margin:0 0 5px;font-size:1.35rem}
p{margin:8px 0}.muted{color:var(--muted);font-size:.94rem}
.version-label{display:block;font-weight:700;margin:14px 0;max-width:360px}
select,input[type=text]{display:block;width:100%;padding:11px 12px;border:1px solid #cbd1d9;border-radius:9px;font:inherit;background:white;margin-top:5px}
aside{background:#fff7f6;border-left:4px solid var(--red);padding:12px 14px;border-radius:7px;margin:16px 0;color:#45484d}
button{border:0;border-radius:9px;padding:11px 17px;background:var(--red);color:#fff;font:inherit;font-weight:750;cursor:pointer}
button:hover{filter:brightness(.96)}button:disabled{opacity:.55;cursor:not-allowed}.secondary{background:#eceff2;color:#252a31}
.hidden{display:none!important}
.practicehead{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}
.progressline{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:.9rem;margin:12px 0 18px}
.track{height:8px;background:#e9edf1;border-radius:20px;overflow:hidden;flex:1}#progressBar{height:100%;width:0;background:var(--red);transition:width .2s}
.question{border-top:1px solid var(--line);padding:18px 0}.qtitle{font-weight:750;margin:0 0 11px}.qmeta{font-size:.75rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-bottom:5px}
.qnumber{display:inline-block;color:#a51f19;background:#fce9e7;border-radius:7px;padding:2px 8px;margin-right:7px}
.options{display:grid;gap:8px}.option{display:flex;align-items:flex-start;gap:9px;border:1px solid var(--line);border-radius:9px;padding:10px;cursor:pointer}.option:hover{background:#fffafa;border-color:#d58a85}.option input{margin-top:5px;accent-color:var(--red)}
.answertext{width:100%;padding:11px;border:1px solid #cbd1d9;border-radius:9px;font:inherit}
.finish{border-top:1px solid var(--line);padding-top:18px;margin-top:8px}.finish .muted{font-size:.88rem}
.results{margin-top:22px;border-top:2px solid var(--line);padding-top:18px}.score{font-size:2.1rem;color:var(--green);font-weight:850}.review{border-bottom:1px solid var(--line);padding:13px 0}.correct{color:var(--green);font-weight:750}.incorrect{color:#b42318;font-weight:750}.explain{color:var(--muted);font-size:.93rem}
footer{text-align:center;color:var(--muted);font-size:.84rem;padding:16px}
@media(max-width:620px){.card{padding:15px}.practicehead{align-items:flex-start;flex-direction:column}.progressline{align-items:flex-start;flex-direction:column}.track{width:100%;flex:auto}}
@media print{header{background:white;color:black}.finish,button{display:none!important}.card{box-shadow:none}.question{break-inside:avoid}}