:root {
  color-scheme:light; --bg:#fff; --surface:#fff; --ink:#111; --muted:#626262;
  --line:#dedede; --strong-line:#8a8a8a; --soft:#f5f5f5; --accent:#2455d6;
  --on-ink:#fff; --good:var(--ink); --bad:var(--ink);
  --heading:"Bahnschrift SemiCondensed","Arial Narrow",Impact,sans-serif;
  --mono:ui-monospace,"Cascadia Mono",Consolas,monospace;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:17px; line-height:1.6; background:var(--bg); color:var(--ink);
}
:root[data-theme="dark"] {
  color-scheme:dark; --bg:#0c0c0c; --surface:#0c0c0c; --ink:#f5f5f5;
  --muted:#ababab; --line:#303030; --strong-line:#666; --soft:#171717;
  --accent:#8baaff; --on-ink:#0c0c0c;
}
@media(prefers-color-scheme:dark) {
  :root:not([data-theme="light"]) {
    color-scheme:dark; --bg:#0c0c0c; --surface:#0c0c0c; --ink:#f5f5f5;
    --muted:#ababab; --line:#303030; --strong-line:#666; --soft:#171717;
    --accent:#8baaff; --on-ink:#0c0c0c;
  }
}
* { box-sizing:border-box; }
body { margin:0; }
button,input,select { font:inherit; }
button,a,input,summary { -webkit-tap-highlight-color:transparent; }
button,summary,a { touch-action:manipulation; }
a { color:var(--ink); text-underline-offset:5px; }
a:hover { color:var(--accent); }
button {
  min-height:44px; min-width:44px; padding:12px 20px; border:1px solid var(--strong-line);
  border-radius:0; background:transparent; color:var(--ink);
  font-size:.85rem; font-weight:600; line-height:1.4; cursor:pointer;
}
button:hover:not(:disabled) { background:var(--soft); border-color:var(--ink); }
button:disabled { opacity:.4; cursor:default; }
button.primary { background:var(--ink); border-color:var(--ink); color:var(--on-ink); }
button.primary:hover:not(:disabled) { background:var(--ink); opacity:.84; }
button.danger { border-color:var(--line); }
button.text-button { border-color:transparent; padding:10px 12px; background:transparent; font-weight:500; }
button.text-button:hover:not(:disabled) { background:transparent; color:var(--accent); border-color:transparent; }
button.text-button[aria-current="page"] { text-decoration:underline; text-decoration-color:var(--accent); text-underline-offset:8px; }
:focus-visible { outline:2px solid var(--accent); outline-offset:5px; }
h1,h2,h3,p { margin-top:0; }
h1,h2 { text-wrap:balance; }
h1 {
  font-family:var(--heading); font-size:clamp(2.3rem,5vw,4rem); font-weight:700;
  letter-spacing:-.025em; line-height:1.06; text-transform:uppercase;
}
h2 { font-size:1.25rem; font-weight:600; line-height:1.35; letter-spacing:-.025em; }
h3 { font-size:1rem; }
p { margin-bottom:1rem; }
small,.small { font-size:.82rem; }
hr { border:0; border-top:1px solid var(--line); margin:32px 0; }
.muted { color:var(--muted); }
.eyebrow {
  margin-bottom:22px; color:var(--accent); font-family:var(--mono); font-size:.65rem;
  font-weight:600; letter-spacing:.12em; text-transform:uppercase;
}
.sr-only { position:absolute; width:1px; height:1px; padding:0; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.skip { position:fixed; top:-90px; left:12px; z-index:20; background:var(--surface); padding:12px; }
.skip:focus { top:12px; }
.site-header {
  max-width:1440px; margin:auto; padding:24px 48px; display:flex; align-items:center;
  justify-content:space-between; gap:24px; border-bottom:1px solid var(--line);
}
.brand { display:flex; align-items:center; gap:14px; min-height:44px; color:var(--ink); text-decoration:none; font-weight:650; font-size:.85rem; }
.brand small { display:block; margin-top:2px; color:var(--muted); font-size:.67rem; font-weight:400; }
.brand-mark { display:grid; place-items:center; width:44px; height:44px; border:1px solid var(--ink); color:var(--accent); font-family:var(--mono); font-weight:500; font-size:.78rem; }
.site-header nav { display:flex; gap:18px; flex-wrap:wrap; }
.site-header nav button { font-size:.78rem; }
#history-count { margin-left:4px; color:var(--muted); font-family:var(--mono); font-size:.65rem; }
main { max-width:1280px; margin:auto; padding:76px 48px 86px; min-height:calc(100vh - 205px); }
.site-footer { max-width:1344px; margin:0 auto; padding:25px 24px; border-top:1px solid var(--line); display:flex; justify-content:space-between; gap:20px; color:var(--muted); font-family:var(--mono); font-size:.64rem; }
.alerts { max-width:1280px; margin:auto; }
.alert { padding:18px 22px; margin:20px 48px 0; border:1px solid var(--line); border-left:2px solid var(--accent); background:var(--surface); font-size:.85rem; overflow-wrap:anywhere; }
.alert.error { border-left-color:var(--ink); }
.alert button { margin:12px 12px 0 0; }
.loading { padding:50px 0; }
.actions { display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.actions.spread { justify-content:space-between; }
.full { width:100%; }
.home-grid { display:grid; grid-template-columns:minmax(0,1.6fr) minmax(0,1fr); align-items:center; gap:clamp(40px,7vw,112px); padding:12px 0 36px; }
.intro { max-width:100%; container-type:inline-size; }
.intro h1 { max-width:100%; margin-bottom:24px; font-size:clamp(2rem,6.5vw,6.4rem); font-size:clamp(2rem,12.8cqw,6.4rem); font-stretch:condensed; line-height:.98; letter-spacing:-.035em; }
.topic-subtitle { margin:0 0 28px; color:var(--muted); font-size:.85rem; }
.subtitle { max-width:38ch; color:var(--ink); font-size:1.05rem; line-height:1.65; margin-bottom:26px; }
.rule-tags { display:flex; flex-wrap:wrap; gap:10px 18px; margin:30px 0 20px; }
.tag { color:var(--muted); font-size:.7rem; font-family:var(--mono); }
.tag + .tag::before { content:"/"; color:var(--strong-line); margin-right:18px; }
.intro > .small { max-width:55ch; font-size:.78rem; }
.start-card { padding:10px 0 10px 36px; border-left:1px solid var(--line); }
.start-card .eyebrow { color:var(--muted); margin-bottom:28px; }
.mini-grid { display:grid; grid-template-columns:1fr 1fr; gap:28px; margin-bottom:30px; }
.card-number { margin-bottom:9px; font-family:var(--heading); font-size:clamp(3rem,6vw,4.8rem); font-weight:600; line-height:1; letter-spacing:-.04em; font-variant-numeric:tabular-nums; }
.metric-label { display:block; color:var(--muted); font-size:.72rem; }
.start-card .primary { width:100%; min-height:54px; margin:10px 0 18px; font-family:var(--heading); font-size:1rem; font-weight:650; letter-spacing:.045em; text-transform:uppercase; }
.start-card .full { margin-bottom:18px; }
.card-note { max-width:38ch; color:var(--muted); font-size:.73rem; margin:0; }
.quiet-section { border-top:1px solid var(--line); margin-top:40px; padding-top:28px; }
.quiet-section h2 { font-family:var(--heading); font-size:1.65rem; text-transform:uppercase; letter-spacing:-.01em; margin-bottom:12px; }
.quiet-section > .small { font-size:.76rem; }
.section-list { display:grid; grid-template-columns:1fr 1fr; gap:0 48px; list-style:none; margin:26px 0 0; padding:0; }
.section-list li { display:flex; justify-content:space-between; gap:20px; padding:15px 0; border-bottom:1px solid var(--line); font-size:.8rem; }
.section-list .muted { flex-shrink:0; font-family:var(--mono); font-size:.72rem; }
.local-note { max-width:100ch; margin:32px 0 0; font-size:.72rem; line-height:1.7; color:var(--muted); }
.link-row { display:flex; flex-wrap:wrap; gap:28px; margin-top:16px; font-size:.73rem; }
.link-row a { display:inline-flex; align-items:center; min-height:44px; }
.exam { max-width:800px; margin:auto; }
.exam-top { display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px; color:var(--muted); font-family:var(--mono); font-size:.69rem; margin-bottom:16px; }
progress { display:block; width:100%; height:2px; border:0; background:var(--line); accent-color:var(--accent); margin-bottom:32px; border-radius:0; }
progress::-webkit-progress-bar { background:var(--line); }
progress::-webkit-progress-value { background:var(--accent); }
progress::-moz-progress-bar { background:var(--accent); }
.question-meta { display:flex; justify-content:space-between; align-items:center; gap:20px; margin:38px 0 20px; }
.question-meta .eyebrow { margin:0; letter-spacing:.05em; }
.question-meta .small { font-family:var(--mono); font-size:.67rem; white-space:nowrap; }
.question-title { margin-bottom:18px; font-family:inherit; font-size:clamp(1.5rem,3vw,2rem); font-weight:600; line-height:1.38; letter-spacing:-.025em; text-transform:none; text-wrap:pretty; }
.format-note { color:var(--muted); font-size:.77rem; margin-bottom:30px; }
fieldset { border:0; padding:0; margin:0; min-width:0; }
.options { display:grid; border-top:1px solid var(--line); }
.option { display:flex; align-items:center; gap:18px; min-height:72px; padding:21px 22px; border-left:2px solid transparent; border-bottom:1px solid var(--line); cursor:pointer; font-size:.95rem; line-height:1.5; }
.option:hover { background:var(--soft); }
.option.chosen { border-left-color:var(--accent); background:var(--soft); }
.option input { flex-shrink:0; width:19px; height:19px; accent-color:var(--ink); margin:0; }
.option-text { flex:1; min-width:0; overflow-wrap:anywhere; }
.selected-label { display:block; margin-top:5px; color:var(--accent); font-family:var(--mono); font-size:.59rem; font-weight:500; letter-spacing:.05em; text-transform:uppercase; }
.question-tools { display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; margin:18px 0 30px; }
.question-tools button { padding-left:0; padding-right:0; font-size:.76rem; }
.question-nav { display:flex; justify-content:space-between; gap:12px; border-top:1px solid var(--line); padding-top:24px; }
.question-nav button { min-width:132px; }
.exam-bottom { display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:18px; margin-top:30px; }
.exam-bottom .small { font-size:.73rem; }
.map { border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:4px 0; margin-top:28px; }
summary { display:list-item; min-height:44px; padding:13px 0; cursor:pointer; font-size:.8rem; font-weight:500; }
.map-grid { display:grid; grid-template-columns:repeat(10,minmax(0,1fr)); gap:8px; margin:16px 0; }
.map-grid button { min-width:0; min-height:48px; padding:6px 0; border-color:var(--line); font-family:var(--mono); font-size:.72rem; }
.map-grid button.done { background:var(--soft); }
.map-grid button.current { border:2px solid var(--accent); }
.map-symbol { display:block; min-height:1em; font-size:.61rem; }
.legend { font-size:.67rem; color:var(--muted); }
.answer-feedback { margin:28px 0 12px; padding:22px 24px; border-left:2px solid var(--accent); background:var(--soft); overflow-wrap:anywhere; }
.answer-feedback h2 { margin-bottom:15px; color:var(--ink); font-size:1.05rem; }
.answer-feedback p { font-size:.85rem; }
.answer-feedback p:last-child { margin:16px 0 0; font-size:.74rem; }
.reference { margin-bottom:0; color:var(--muted); font-size:.73rem; }
.reference strong { color:var(--ink); font-weight:550; }
.document-page-link { display:inline-flex; align-items:center; min-height:44px; padding:8px 0; }
.reference .document-page-link { color:var(--accent); }
.document-view h1 { max-width:none; }
.document-toolbar { padding:10px 0 12px; }
.document-toolbar .actions { gap:12px 26px; }
.document-toolbar .actions > a { font-size:.78rem; }
.document-toolbar form { display:flex; align-items:center; flex-wrap:wrap; gap:12px; margin:22px 0 12px; font-size:.8rem; }
.document-toolbar input { width:5rem; min-height:44px; border:1px solid var(--strong-line); border-radius:0; padding:8px; background:var(--surface); color:var(--ink); }
.document-controls { margin:18px 0; }
.document-controls > label { font-size:.8rem; }
.document-image-frame { overflow:auto; max-width:100%; border:1px solid var(--line); background:#fff; }
.document-page-image { display:block; width:100%; height:auto; }
.document-image-frame.zoomed .document-page-image { width:200%; max-width:none; }
.document-text { border-top:1px solid var(--line); padding:16px 0; margin-top:28px; }
.document-transcript { white-space:pre-wrap; overflow-wrap:anywhere; font-size:.9rem; line-height:1.7; }
dialog { width:520px; max-width:calc(100% - 32px); padding:34px; border:1px solid var(--strong-line); border-radius:0; background:var(--surface); color:var(--ink); }
dialog::backdrop { background:#0009; }
dialog h2 { margin-bottom:18px; font-family:var(--heading); font-size:1.9rem; font-weight:600; line-height:1.12; text-transform:uppercase; }
dialog p { color:var(--muted); font-size:.9rem; }
dialog .actions { justify-content:flex-end; gap:12px; margin-top:28px; }
.result-wrap { max-width:720px; margin:auto; }
.result-wrap h1 { font-size:clamp(2.2rem,5vw,3.5rem); }
.score { margin:20px 0 10px; font-family:var(--heading); font-size:7rem; font-weight:650; line-height:1; letter-spacing:-.06em; font-variant-numeric:tabular-nums; }
.score small { color:var(--muted); font-family:system-ui,sans-serif; font-size:1.1rem; font-weight:400; letter-spacing:0; }
.result-stats { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:24px 0; margin:32px 0; }
.stat strong { display:block; font-family:var(--heading); font-size:2.6rem; font-weight:600; line-height:1.2; }
.stat span { color:var(--muted); font-size:.75rem; }
.result-wrap .actions { margin-bottom:26px; }
.review-header { margin-bottom:38px; }
.review-item { border-bottom:1px solid var(--line); padding:28px 0 32px; margin-bottom:10px; overflow-wrap:anywhere; }
.review-item h2 { max-width:68ch; font-size:1.17rem; font-weight:600; line-height:1.5; }
.status-badge { display:inline-block; margin-bottom:20px; color:var(--accent); font-family:var(--mono); font-size:.66rem; font-weight:500; letter-spacing:.035em; text-transform:uppercase; }
.answer-row { margin:0 0 10px; padding:12px 16px; background:var(--soft); font-size:.85rem; }
.answer-row.correct { border-left:2px solid var(--accent); }
.explanation { margin:20px 0; font-size:.86rem; }
.history-row { display:flex; align-items:center; justify-content:space-between; gap:24px; padding:26px 0; border-bottom:1px solid var(--line); }
.history-score { margin-bottom:7px; font-family:var(--heading); font-size:2.5rem; font-weight:600; line-height:1.2; }
.history-info { color:var(--muted); font-size:.76rem; line-height:1.8; }
.empty { padding:40px 0; color:var(--muted); }
.filter { display:flex; align-items:center; flex-wrap:wrap; gap:14px; margin:24px 0; font-size:.8rem; }
select { min-height:44px; max-width:100%; padding:9px 12px; border:1px solid var(--strong-line); border-radius:0; background:var(--surface); color:var(--ink); font-size:.8rem; }
.error-list { padding-left:22px; font-size:.83rem; overflow-wrap:anywhere; }
@media(max-width:900px) {
  .site-header { padding:20px 30px; }
  .site-header nav { gap:4px; }
  main { padding:54px 30px 65px; }
  .home-grid { gap:36px; grid-template-columns:minmax(0,1.3fr) minmax(0,1fr); }
  .start-card { padding-left:26px; }
  .section-list { gap:0 30px; }
  .alert { margin-left:30px; margin-right:30px; }
}
@media(max-width:650px) {
  .site-header { flex-wrap:wrap; gap:16px; padding:18px 24px; }
  .site-header nav { gap:4px; }
  .site-header nav button { padding:10px 8px; font-size:.73rem; }
  .brand { gap:12px; }
  .brand-mark { width:38px; height:38px; }
  main { padding:44px 24px 52px; }
  .home-grid { grid-template-columns:1fr; gap:34px; padding:0; }
  .subtitle { font-size:.96rem; }
  .rule-tags { gap:8px 12px; margin-top:26px; }
  .tag { font-size:.64rem; }
  .tag + .tag::before { margin-right:12px; }
  .start-card { border-left:0; border-top:1px solid var(--line); padding:28px 0 0; }
  .start-card .eyebrow { margin-bottom:20px; }
  .mini-grid { gap:24px; margin-bottom:22px; }
  .card-number { font-size:3.8rem; }
  .start-card .primary { margin-top:4px; }
  .quiet-section { margin-top:38px; }
  .section-list { grid-template-columns:1fr; margin-top:20px; }
  .section-list li { font-size:.76rem; }
  .site-footer { margin:0 24px; padding:22px 0; flex-wrap:wrap; gap:10px; font-size:.6rem; }
  .alert { margin-left:24px; margin-right:24px; }
  .question-meta { margin:28px 0 18px; gap:12px; }
  .question-meta .eyebrow { font-size:.62rem; }
  .question-title { font-size:1.45rem; }
  .question-tools button { font-size:.72rem; }
  .map-grid { grid-template-columns:repeat(auto-fit,minmax(44px,1fr)); }
  .history-row { flex-wrap:wrap; }
  .history-row > button { width:100%; }
  .document-toolbar .actions { align-items:flex-start; gap:10px 20px; }
  .document-controls { gap:10px; }
  .result-stats { gap:12px; }
  .score { font-size:5.8rem; }
  dialog { padding:26px; }
}
@media(max-width:380px) {
  .site-header { padding:16px; gap:14px; }
  .site-header nav { width:100%; justify-content:space-between; }
  main { padding:32px 16px 44px; }
  .rule-tags { gap:7px 10px; }
  .tag { font-size:.6rem; }
  .tag + .tag::before { margin-right:10px; }
  .option { padding:18px 12px; gap:12px; font-size:.89rem; }
  .question-title { font-size:1.35rem; }
  .question-meta .small { font-size:.59rem; }
  .question-nav button { min-width:0; padding:12px 15px; }
  .answer-feedback { padding:20px 16px; }
  .site-footer { margin:0 16px; }
  .alert { margin-left:16px; margin-right:16px; padding:16px; }
  .map-grid { gap:7px; }
  .link-row { gap:10px 20px; }
  dialog .actions { flex-direction:column; align-items:stretch; }
}
@media(prefers-reduced-motion:no-preference) {
  button,a,.option { transition:color .12s,background .12s,border-color .12s; }
}