:root{--bg:#fff;--soft:#f6f7fb;--card:#fff;--ink:#0f172a;--mute:#5b6a82;--line:#e8eaf0;--hover:#f3f5fa;--brand:#3563f5;--brand-ink:#fff;--brand-soft:#eaf0ff;--code:#0f172a;--codebg:#f3f5fa;--note:#eaf0ff;--tip:#d1fae5;--warn:#fef3c7;--bad:#fee2e2;--head:58px}
@media (prefers-color-scheme:dark){:root{--bg:#0b0f1a;--soft:#0f1524;--card:#121828;--ink:#e8ecf7;--mute:#9aa7c2;--line:#222b44;--hover:#182038;--brand:#6b8cff;--brand-soft:#1a2547;--codebg:#0f1524;--note:#1a2547;--tip:#0d3a2c;--warn:#3d2e0d;--bad:#42171a}}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--head) + 16px)}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 Inter,system-ui,-apple-system,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--brand);color:#fff;padding:8px 12px;border-radius:8px;z-index:100}.skip:focus{left:8px}

.top{position:sticky;top:0;z-index:30;height:var(--head);display:flex;align-items:center;gap:18px;padding:0 24px;background:var(--bg);border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:18px;letter-spacing:-.4px;color:var(--ink);display:flex;gap:8px;align-items:baseline;white-space:nowrap}.brand b{color:var(--brand)}.brand em{font-style:normal;font-weight:500;color:var(--mute);font-size:16px}.brand:hover{text-decoration:none}
.menu{display:none;background:none;border:0;font-size:22px;color:var(--ink);cursor:pointer;padding:4px 6px}
.search{position:relative;flex:1;max-width:420px;margin:0 auto 0 10px}
.search input{width:100%;background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:9px 14px;font:inherit;font-size:14px;color:var(--ink)}
.search input::placeholder{color:var(--mute)}
.results{position:absolute;left:0;right:0;top:46px;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 40px rgba(15,23,42,.18);max-height:70vh;overflow:auto;padding:6px}
.results a{display:block;padding:10px 12px;border-radius:8px;color:var(--ink)}.results a:hover,.results a[aria-selected=true]{background:var(--hover);text-decoration:none}
.results small{display:block;color:var(--mute);font-size:12px}.results strong{font-size:14px}.results span{display:block;color:var(--mute);font-size:13px;line-height:1.45;margin-top:2px}.results mark{background:var(--brand-soft);color:inherit;border-radius:3px}
.results .none{padding:14px;color:var(--mute);font-size:14px}
.top-links{display:flex;gap:18px;align-items:center;font-size:14px}.top-links a{color:var(--mute);font-weight:500}.top-links a:hover{color:var(--ink);text-decoration:none}
.top-links .cta{background:var(--brand);color:var(--brand-ink);padding:8px 14px;border-radius:9px;font-weight:600}.top-links .cta:hover{filter:brightness(1.08);color:var(--brand-ink)}

.layout{display:grid;grid-template-columns:260px minmax(0,1fr);max-width:1360px;margin:0 auto}
.side{position:sticky;top:var(--head);align-self:start;height:calc(100vh - var(--head));overflow:auto;padding:20px 14px 40px 24px;border-right:1px solid var(--line)}
.nav-g{margin-bottom:12px}.nav-g summary{cursor:pointer;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--ink);padding:6px 10px;list-style:none}
.nav-g summary::-webkit-details-marker{display:none}
.nav-g a{display:block;padding:7px 10px;border-radius:8px;color:var(--mute);font-size:14.5px;font-weight:500;line-height:1.35}.nav-g a:hover{background:var(--hover);color:var(--ink);text-decoration:none}
.nav-g a[aria-current=page]{background:var(--brand-soft);color:var(--brand);font-weight:600}

.main{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:44px;padding:36px 40px 70px}
article{min-width:0;max-width:760px}
.crumbs{font-size:13px;color:var(--mute);margin-bottom:14px}.crumbs span{margin:0 4px}.crumbs a{color:var(--mute)}.crumbs [aria-current]{color:var(--brand);font-weight:500}
h1{font-size:38px;line-height:1.15;letter-spacing:-1px;margin:0 0 14px}
h2{font-size:25px;letter-spacing:-.5px;margin:42px 0 10px;line-height:1.25}h3{font-size:18px;margin:28px 0 6px;line-height:1.3}
h2 .anchor,h3 .anchor{margin-left:8px;color:var(--mute);opacity:0;font-weight:400;text-decoration:none}h2:hover .anchor,h3:hover .anchor,.anchor:focus{opacity:.8}
.lead{font-size:19px;line-height:1.6;color:var(--mute);margin:0 0 24px}
article p{margin:12px 0}article li{margin:6px 0}
article ul{padding-left:22px}
article ol{list-style:none;counter-reset:s;padding:0;margin:18px 0}
article ol>li{counter-increment:s;position:relative;padding-left:44px;margin:0 0 16px;min-height:30px}
article ol>li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--brand-soft);color:var(--brand);font-weight:700;font-size:14px;display:grid;place-items:center}
code{font:13.5px/1.5 'JetBrains Mono',ui-monospace,monospace;background:var(--codebg);padding:2px 6px;border-radius:6px}
.code{position:relative;margin:16px 0}.code pre{margin:0;background:var(--codebg);border:1px solid var(--line);border-radius:12px;padding:16px 18px;overflow:auto}.code pre code{background:none;padding:0;font-size:13px}
.copy{position:absolute;right:10px;top:10px;background:var(--card);border:1px solid var(--line);border-radius:7px;padding:3px 9px;font:inherit;font-size:12px;color:var(--mute);cursor:pointer}.copy:hover{color:var(--ink)}
table{border-collapse:collapse;width:100%;margin:18px 0;font-size:15px;display:block;overflow-x:auto}
th,td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}th{font-size:13px;color:var(--mute);font-weight:600;background:var(--soft)}
figure{margin:24px 0}figure img{width:100%;height:auto;border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 30px rgba(15,23,42,.08);display:block}
figcaption{font-size:13px;color:var(--mute);margin-top:8px;text-align:center}
.callout{margin:20px 0;padding:14px 18px;border-radius:12px;border:0;background:var(--note)}.callout p{margin:0}
.callout.tip{background:var(--tip)}.callout.warning,.callout.important{background:var(--warn)}
blockquote:not(.callout){margin:16px 0;padding-left:16px;border-left:3px solid var(--line);color:var(--mute)}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:46px 0 22px}
.pn a{display:block;border:1px solid var(--line);border-radius:12px;padding:14px 16px;color:var(--ink);font-weight:600;background:var(--card)}.pn a:hover{border-color:var(--brand);text-decoration:none}.pn a.r{text-align:right}
.pn small{display:block;color:var(--mute);font-weight:500;font-size:12px}
.fb{font-size:14px;color:var(--mute);border-top:1px solid var(--line);padding-top:16px}

.toc{position:relative}.toc-in{position:sticky;top:calc(var(--head) + 24px);display:flex;flex-direction:column;border-left:1px solid var(--line);padding-left:14px;font-size:13.5px}
.toc-in strong{font-size:12px;letter-spacing:.04em;text-transform:uppercase;margin-bottom:8px}
.toc-in a{color:var(--mute);padding:4px 0;line-height:1.4}.toc-in a.d3{padding-left:12px}.toc-in a:hover{color:var(--ink);text-decoration:none}.toc-in a.on{color:var(--brand);font-weight:600}
.toc-in .try{margin-top:16px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;color:var(--brand);font-weight:600}

.home h1{font-size:44px}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:26px 0 10px}
.card{display:flex;flex-direction:column;gap:4px;border:1px solid var(--line);border-radius:14px;padding:18px;background:var(--card);color:var(--ink)}.card:hover{border-color:var(--brand);text-decoration:none;box-shadow:0 8px 24px rgba(15,23,42,.08)}
.card small{color:var(--brand);font-weight:600;font-size:12px}.card strong{font-size:17px}.card span{color:var(--mute);font-size:14px;line-height:1.5}
.list{list-style:none;padding:0;margin:6px 0 10px}.list li{padding:8px 0;border-bottom:1px solid var(--line)}.list span{color:var(--mute);font-size:14px;display:block}
.home .main,.main.home{grid-template-columns:minmax(0,1fr)}.home article{max-width:900px}
.foot{border-top:1px solid var(--line);padding:22px 24px;text-align:center;color:var(--mute);font-size:13px}.foot a{color:var(--mute)}

@media(max-width:1180px){.main{grid-template-columns:minmax(0,1fr)}.toc{display:none}}
@media(max-width:860px){
  .top{padding:0 14px;gap:10px}.menu{display:block}.top-links a:not(.cta){display:none}.top-links .cta{padding:7px 10px;font-size:13px;white-space:nowrap}.search{margin:0;max-width:none;min-width:0}.brand em{display:none}
  .layout{display:block}
  .side{position:fixed;left:0;top:var(--head);bottom:0;width:min(300px,86vw);height:auto;background:var(--bg);z-index:25;transform:translateX(-102%);transition:transform .2s;box-shadow:8px 0 30px rgba(0,0,0,.18)}
  body.nav-open .side{transform:none}
  .main{padding:24px 18px 50px}h1{font-size:30px}.home h1{font-size:34px}.pn{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.side{transition:none}}
@media print{.top,.side,.toc,.pn,.foot,.fb{display:none}.layout,.main{display:block;padding:0}}