:root{--bg: #f4f5f2;--card: #ffffff;--fg: #1b1f24;--muted: #5c636e;--border: #d8dbd4;--accent: #0f6b5c;--accent-fg: #ffffff;--accent-soft: rgba(15, 107, 92, .1);--good: #1d7a46;--warn: #9a5b00;--bad: #b3261e;--warn-soft: rgba(154, 91, 0, .1);--bad-soft: rgba(179, 38, 30, .09);--code-bg: #f1f2ee;--focus-line: rgba(232, 163, 58, .25);--mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}@media(prefers-color-scheme:dark){:root{--bg: #111416;--card: #1a1e21;--fg: #e6e8ea;--muted: #9aa2ab;--border: #2c3236;--accent: #4fc2ad;--accent-fg: #0d1112;--accent-soft: rgba(79, 194, 173, .13);--good: #4cc27f;--warn: #f0b04a;--bad: #ff6b60;--warn-soft: rgba(240, 176, 74, .12);--bad-soft: rgba(255, 107, 96, .12);--code-bg: #14181a;--focus-line: rgba(240, 176, 74, .18)}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}#app{max-width:1120px;margin:0 auto;padding:20px 16px 64px}h1{margin:0;font-size:1.6rem}h2{font-size:1.15rem;margin:0 0 10px}h3{font-size:1rem;margin:0 0 6px}a{color:var(--accent)}.top{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 16px;margin-bottom:14px}.lede{margin:4px 0 0;color:var(--muted);max-width:70ch}.muted{color:var(--muted)}.small{font-size:.86rem}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:14px}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:14px;overflow-x:auto}.tabs button{white-space:nowrap;border:0;border-bottom:3px solid transparent;border-radius:0;background:none;padding:8px 14px;font-weight:600;color:var(--muted)}.tabs button[aria-selected=true]{color:var(--fg);border-bottom-color:var(--accent)}button,.button{font:inherit;cursor:pointer;border:1px solid var(--border);background:var(--card);color:var(--fg);border-radius:7px;padding:6px 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select{width:100%}.hint{font-size:.84rem;color:var(--muted);margin:3px 0 0}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:.92rem}th,td{text-align:left;padding:7px 8px;border-bottom:1px solid var(--border);vertical-align:top}th{font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;color:var(--muted)}tr.selected td{background:var(--accent-soft)}.badge{display:inline-block;padding:1px 8px;border-radius:999px;font-size:.78rem;font-weight:600;border:1px solid var(--border);white-space:nowrap}.badge.kind{background:var(--accent-soft);border-color:transparent;color:var(--accent)}.badge.sev3{background:var(--bad-soft);color:var(--bad);border-color:transparent}.badge.sev2{background:var(--warn-soft);color:var(--warn);border-color:transparent}.badge.sev1{color:var(--muted)}.badge.ok{color:var(--good)}pre.code{font:.84rem/1.45 var(--mono);background:var(--code-bg);border:1px solid var(--border);border-radius:8px;padding:8px 0;overflow-x:auto;margin:8px 0}pre.code .ln{display:block;padding:0 12px 0 0;white-space:pre}pre.code .ln:before{content:attr(data-n);display:inline-block;width:3.2em;padding-right:.8em;text-align:right;color:var(--muted);user-select:none}pre.code .ln.focus{background:var(--focus-line)}code{font-family:var(--mono);font-size:.92em}.question{border-top:1px solid var(--border);padding-top:12px;margin-top:12px}.question:first-of-type{border-top:0;margin-top:0;padding-top:0}.turn{margin:6px 0;padding:6px 10px;border-radius:8px;white-space:pre-wrap}.turn.question,.turn.followup{background:var(--accent-soft)}.turn.answer{border:1px solid var(--border)}.turn .who{display:block;font-size:.76rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}blockquote{margin:6px 0;padding:4px 12px;border-left:3px solid var(--accent);color:var(--fg)}.flag-list{margin:6px 0 0;padding-left:18px}.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:14px}@media(max-width:820px){.two{grid-template-columns:minmax(0,1fr)}}.notice{padding:8px 12px;border-radius:8px;background:var(--accent-soft);margin:8px 0}.notice.bad{background:var(--bad-soft);color:var(--bad)}.timer{font:600 1.3rem var(--mono)}.timer.low{color:var(--bad)}.progress{height:6px;background:var(--border);border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:var(--accent)}.student{max-width:820px;margin:0 auto}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}details summary{cursor:pointer;font-weight:600}.stat{display:inline-block;margin-right:16px}.stat b{font-size:1.3rem;display:block}button.linkish{border:0;padding:0;background:none;color:var(--accent);text-decoration:underline;font-weight:600}button.small{font-size:.82rem;padding:2px 8px}.demo-bar{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:12px 20px;align-items:end;border-color:var(--accent);background:var(--accent-soft)}.demo-bar h2{margin-bottom:4px}.demo-bar p{margin:0}.demo-pick{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.demo-pick label{flex-basis:100%;margin:0}.demo-pick select{flex:1 1 220px;min-width:0}@media(max-width:720px){.demo-bar{grid-template-columns:minmax(0,1fr)}}details.help summary{font-size:.95rem}details.help[open] summary{margin-bottom:6px}ol.steps{margin:6px 0;padding-left:22px}ol.steps li{margin:6px 0}.guide p,.guide li{max-width:78ch}