:root{color-scheme:light;--bg:#f5f9fa;--panel:#fff;--text:#122c36;--muted:#526974;--line:#d8e5e8;--accent:#007c76;--soft:#e2f5f0}html[data-site-theme=dark]{color-scheme:dark;--bg:#091b24;--panel:#102a35;--text:#edf7f8;--muted:#afc6ce;--line:#2e4954;--accent:#5ee0ce;--soft:#163c40}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,'Malgun Gothic',sans-serif;line-height:1.75}a{color:var(--accent);text-underline-offset:5px}header,main,footer{max-width:1120px;margin:auto;padding:24px}header{display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;gap:10px;align-items:center;color:var(--text);font-weight:800;text-decoration:none}.brand img{width:34px;height:34px;border-radius:10px}button{font:inherit;color:var(--text);background:var(--panel);border:1px solid var(--line);padding:9px 14px;border-radius:12px;cursor:pointer}nav{display:flex;gap:8px;flex-wrap:wrap}nav a{padding:8px 16px;border-radius:24px;text-decoration:none;color:var(--muted);border:1px solid var(--line)}nav a[aria-current]{background:var(--soft);color:var(--accent);font-weight:700}.hero{padding:64px 0 36px;max-width:850px}.eyebrow{font-size:12px;letter-spacing:.15em;color:var(--accent);font-weight:800}h1{font-size:clamp(32px,5vw,58px);line-height:1.22;letter-spacing:-.05em;margin:20px 0}h2{font-size:28px;line-height:1.35;letter-spacing:-.035em}h3{font-size:19px;margin:8px 0}p{color:var(--muted);margin:12px 0}.intro{font-size:18px;max-width:730px}.cta{display:inline-block;background:var(--accent);color:var(--bg);font-weight:800;padding:13px 22px;border-radius:12px;text-decoration:none;margin-top:14px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card,.example,details{border:1px solid var(--line);background:var(--panel);border-radius:20px;padding:24px}.number{color:var(--accent);font-weight:800}.example{margin-top:24px;background:var(--soft)}.example strong{font-size:clamp(19px,3vw,26px);overflow-wrap:anywhere}section{margin:48px 0}ol{padding:0;list-style:none;display:grid;gap:16px}ol li{border-bottom:1px solid var(--line);padding:12px 0 20px;display:grid;grid-template-columns:48px 1fr;gap:12px}details{margin:10px 0;padding:18px 22px}summary{cursor:pointer;font-weight:700}details p{overflow-wrap:anywhere}.end{border-top:1px solid var(--line);padding-top:24px}footer{font-size:13px;color:var(--muted);padding-bottom:50px}.related{display:flex;flex-wrap:wrap;gap:20px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}@media(max-width:650px){header,main,footer{padding:18px}.hero{padding:36px 0 20px}.grid{grid-template-columns:1fr}.card{padding:20px}h2{font-size:25px}section{margin:34px 0}nav a{font-size:14px;padding:7px 12px}.intro{font-size:16px}}