:root{--blue:#4687E1;--blue-d:#3A78DC;--blue-l:#5C9BEE;--ink:#10141b;--muted:#5a6675;--faint:#8a94a3;--bg:#eef3fb;--card:#ffffff;--line:#e6ecf5;--radius:18px;--shadow:0 16px 40px rgba(24,49,96,.1)}@media(prefers-color-scheme:dark){:root{--ink:#eef1f6;--muted:#a7b0bf;--faint:#7d8696;--bg:#0e1116;--card:#171b22;--line:#252b35;--shadow:0 16px 40px rgba(0,0,0,.45)}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,Roboto,Helvetica,Arial,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.nav{position:sticky;top:0;z-index:20;-webkit-backdrop-filter:saturate(180%) blur(12px);backdrop-filter:saturate(180%) blur(12px);background:color-mix(in srgb,var(--bg) 78%,transparent);border-bottom:1px solid var(--line)}.nav .row{max-width:980px;margin:0 auto;padding:12px 22px;display:flex;align-items:center;gap:12px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.2px}.mark{width:30px;height:30px;border-radius:9px;display:block;box-shadow:0 4px 12px #4687e166}.nav .spacer{flex:1}.nav .cta{font-size:13px;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--blue-l),var(--blue-d));padding:8px 14px;border-radius:100px;box-shadow:0 6px 16px #4687e159}.nav .cta:hover{text-decoration:none;filter:brightness(1.05)}.hero{background:linear-gradient(135deg,var(--blue-l) 0%,var(--blue-d) 100%);color:#fff;text-align:center;padding:64px 22px 92px;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;inset:0;background:radial-gradient(900px 300px at 50% -10%,rgba(255,255,255,.18),transparent 60%)}.hero .badge{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.4px;background:#ffffff29;border:1px solid rgba(255,255,255,.3);padding:6px 13px;border-radius:100px;margin-bottom:16px}.hero h1{margin:0 0 8px;font-size:40px;letter-spacing:-1px}.hero p{margin:0 auto;max-width:560px;opacity:.92;font-size:16px}.wrap{max-width:980px;margin:-56px auto 0;padding:0 22px 90px;position:relative;z-index:2}.grid{display:grid;grid-template-columns:230px 1fr;gap:30px;align-items:start}@media(max-width:820px){.grid{grid-template-columns:1fr}.toc{display:none}}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:26px}@media(max-width:680px){.cards{grid-template-columns:1fr}}.hl{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.hl .ic{width:38px;height:38px;border-radius:11px;background:#4687e11f;display:grid;place-items:center;margin-bottom:11px}.hl .ic svg{width:20px;height:20px;stroke:var(--blue)}.hl h3{margin:0 0 3px;font-size:15px}.hl p{margin:0;font-size:13px;color:var(--muted)}.toc{position:sticky;top:78px}.toc .t{font-size:11px;font-weight:800;letter-spacing:1px;text-transform:uppercase;color:var(--faint);margin:0 0 10px 12px}.toc a{display:block;color:var(--muted);font-size:14px;font-weight:600;padding:7px 12px;border-radius:9px}.toc a:hover{background:var(--card);color:var(--ink);text-decoration:none}.doc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px 34px}@media(max-width:680px){.doc{padding:24px 20px}}.doc .updated{display:inline-block;font-size:12px;font-weight:700;color:var(--blue);background:#4687e11a;padding:5px 12px;border-radius:100px;margin-bottom:6px}.lead{font-size:16px;color:var(--ink)}section{scroll-margin-top:84px}h2{font-size:19px;letter-spacing:-.3px;margin:30px 0 8px;display:flex;align-items:center;gap:10px}h2 .chip{width:28px;height:28px;border-radius:8px;background:#4687e11f;display:grid;place-items:center;flex:none}h2 .chip svg{width:16px;height:16px;stroke:var(--blue)}p,li{font-size:15px}.muted{color:var(--muted)}ul{padding-left:4px;list-style:none}ul li{position:relative;padding-left:22px;margin:7px 0}ul li:before{content:"";position:absolute;left:4px;top:11px;width:7px;height:7px;border-radius:50%;background:var(--blue)}.note{background:#4687e10f;border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:10px;padding:13px 16px;margin:14px 0;font-size:14px;color:var(--muted)}hr{border:none;border-top:1px solid var(--line);margin:28px 0}footer{text-align:center;color:var(--faint);font-size:13px;margin-top:30px}footer .links{margin-bottom:8px}footer a{font-weight:600;margin:0 8px}
