:root{color-scheme:light dark;--canvas:#f8fafc;--surface:#fff;--ink:#17233c;--muted:#44546b;--line:#cbd5e1;--accent:#075985;font:17px/1.75 system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink)}a{color:var(--accent);text-underline-offset:4px}header{padding:18px max(20px,calc((100vw - 1120px)/2));display:flex;flex-wrap:wrap;gap:16px;align-items:center;border-bottom:1px solid var(--line);background:var(--surface)}.brand{font-size:20px;font-weight:800;white-space:nowrap}nav,.controls{display:flex;flex-wrap:wrap;gap:12px 20px;align-items:center}nav a{padding:7px 0}main{max-width:1120px;padding:24px;margin:auto}h1{font-size:clamp(28px,4vw,46px);line-height:1.2;max-width:27ch}h2{line-height:1.35;font-size:24px}h3{line-height:1.4}.lead{font-size:20px;color:var(--muted);max-width:76ch}section{margin-block:30px}section p,section ul{max-width:82ch}.notice{border-inline-start:4px solid var(--accent);padding:16px 22px;background:var(--surface);margin-block:24px;border-radius:8px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,310px),1fr));gap:22px}.card{padding:24px;border:1px solid var(--line);background:var(--surface);border-radius:16px;margin:0}.card h2{margin-top:0}.language-nav{font-size:14px;border-bottom:1px solid var(--line);padding-bottom:12px}.language-nav [aria-current]{font-weight:800}button{font:inherit;padding:10px 16px;min-height:44px;border:1px solid var(--accent);border-radius:8px;background:var(--surface);color:var(--accent);cursor:pointer}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #ea580c;outline-offset:4px}input{accent-color:var(--accent)}fieldset{min-width:0;padding:20px;margin-block:24px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}legend{font-weight:700;padding-inline:8px}fieldset label,.completion{display:block;padding:10px 0;min-height:44px;cursor:pointer}fieldset button{margin-block:12px}details{padding:14px;border:1px solid var(--line);border-radius:8px;margin-block:16px}summary{font-weight:650;cursor:pointer}details p{margin-bottom:0}.flashcards{padding:24px;border:2px solid var(--accent);border-radius:16px}.copy{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-block:16px}.copy code{font-size:15px;overflow-wrap:anywhere;user-select:all}.copy span{flex-basis:100%;font-size:14px}footer{padding:24px;text-align:center;border-top:1px solid var(--line)}[hidden]{display:none!important}@media(prefers-color-scheme:dark){:root{--canvas:#101827;--surface:#172235;--ink:#f1f5f9;--muted:#cbd5e1;--line:#475569;--accent:#7dd3fc}}@media print{header,footer,.language-nav,button,.controls{display:none!important}:root{color-scheme:light;--canvas:white;--surface:white;--ink:black;--muted:#222;--line:#bbb;--accent:#222}main{padding:0;max-width:none}.card,fieldset{break-inside:avoid}.grid{display:block}.card{margin-bottom:16px}}