:root{color-scheme:light dark;--bg:#f4f5fb;--ink:#20233b;--muted:#595f77;--line:#daddf0;--card:#ffffffd9;--accent:#5144bd;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.8}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0;background:radial-gradient(ellipse at 85% 0,#dcd8ff 0,transparent 42%),var(--bg);color:var(--ink);overflow-wrap:anywhere}a{color:var(--accent);text-underline-offset:.2em}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.skip{position:absolute;left:1rem;top:-5rem}.skip:focus{top:1rem;background:var(--bg);z-index:2}header,main,footer{max-width:1040px;margin:auto;padding:1.5rem 2rem}header{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:.7rem;font-weight:750;text-decoration:none;color:var(--ink);letter-spacing:-.04em;font-size:1.35rem}.brand img{border-radius:14px;width:44px;height:44px}nav{display:flex;gap:1.3rem;flex-wrap:wrap;font-size:.9rem}nav a{text-decoration:none}nav [aria-current=page]{font-weight:700;text-decoration:underline}.eyebrow{color:var(--accent);font-size:.78rem;letter-spacing:.15em;font-weight:700;text-transform:uppercase}h1{font-size:clamp(2.2rem,6vw,3.5rem);line-height:1.15;letter-spacing:-.045em;margin:.6rem 0 1.1rem}h2{font-size:1.35rem;line-height:1.5;margin:2rem 0 .5rem}p{margin:.65rem 0 1rem}.lead{font-size:1.12rem;color:var(--muted);max-width:720px}.meta{color:var(--muted);font-size:.85rem}.panel{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:clamp(1.25rem,4vw,3rem);margin:1.75rem 0;box-shadow:0 12px 44px #211e4b05}.notice{border-left:3px solid var(--accent);padding:.25rem 1rem;background:#7263d209;border-radius:0 8px 8px 0}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.cards a{display:block;text-decoration:none}.cards h2{margin:.5rem 0}.cards p{color:var(--muted)}.language{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;font-size:.9rem;margin:1.4rem 0}.language a{padding:.2rem .75rem;border:1px solid var(--line);border-radius:100px;text-decoration:none}.toc{display:flex;gap:.6rem 1.2rem;flex-wrap:wrap;font-size:.9rem;margin:1.5rem 0}article{max-width:780px}li{margin:.4rem 0}ul{padding-left:1.4rem}footer{border-top:1px solid var(--line);font-size:.85rem;color:var(--muted);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-bottom:3rem}footer p{margin:0}.back{display:inline-block;margin-top:1.5rem}hr{border:0;border-top:1px solid var(--line);margin:3rem 0}
@media(max-width:600px){header,main,footer{padding:1.15rem}.cards{grid-template-columns:1fr}.panel{border-radius:18px}header nav{gap:.9rem}h1{font-size:2.4rem}}
@media(prefers-color-scheme:dark){:root{--bg:#111320;--ink:#eeeefa;--muted:#b1b4cd;--line:#383b56;--card:#1c1f32ed;--accent:#b9adff}body{background:radial-gradient(ellipse at 85% 0,#302452 0,transparent 42%),var(--bg)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:white;color:black}header nav,.language,.back,.skip{display:none}.panel{box-shadow:none;border:0;padding:0}header,main,footer{max-width:none}a{color:inherit}h2{break-after:avoid}}