:root{--bg: #ffffff;--fg: #222;--fg-light: #444;--line: #e2e5e9;--brand: #2547D0;--brand-accent: #0B72FF;--focus: #ffbf47;--radius: 8px;--code: #f5f7fa}@media (prefers-color-scheme: dark){:root{--bg: #101317;--fg: #e6e8ea;--fg-light: #b4b8bf;--line: #2a3038;--code: #1d232b }a{color:#5da9ff}}*{box-sizing:border-box}html{font-size:110%}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Ubuntu,sans-serif;line-height:1.55;background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased}header.site-header{padding:1.25rem 1.5rem;border-bottom:1px solid var(--line);background:linear-gradient(135deg,#f8fafc,#eef2f7)}.brand{font-size:1.15rem;font-weight:600;letter-spacing:.5px;display:flex;align-items:center;gap:.5rem;color:var(--brand);text-decoration:none}nav.breadcrumb{font-size:.75rem;margin-top:.35rem;color:var(--fg-light)}main{margin:0 auto;padding:2rem clamp(1rem,2.5vw,2rem) 4rem}h1{font-size:2.05rem;margin:.25rem 0 1rem;font-weight:600;line-height:1.15}.summary-box{border:1px solid var(--line);border-radius:var(--radius);padding:1.15rem 1.2rem .85rem;background:linear-gradient(135deg,#fff,#f5f8fc);box-shadow:0 2px 4px -2px #00000012}.toc{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:.7rem;margin:1.1rem 0 1.6rem;padding:0;list-style:none}.toc a{display:block;padding:.55rem .65rem;border:1px solid var(--line);border-radius:6px;font-size:.8rem;font-weight:500;background:#fff}.anchor-link{position:absolute;left:-.95em;top:50%;transform:translateY(-50%);opacity:0;transition:.15s}h2:hover .anchor-link,h2:focus-within .anchor-link{opacity:1}.back-top{display:inline-block;margin:2.2rem 0 0;font-size:.7rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase}footer{margin-top:4rem;padding:2.4rem 1.5rem 3rem;border-top:1px solid var(--line);text-align:center;font-size:.8rem;background:linear-gradient(135deg,#f8fafc,#eef2f7)}.skip-link{position:absolute;left:-999px}