:root{
  --bg:#f5f6f4;--surface:#fff;--ink:#14181c;--muted:#4b555e;--line:#d6dad6;
  --accent:#1d3fd1;--accent-ink:#fff;--code-bg:#0f1720;--code-ink:#dbe4ee;
  --warn-bg:#fff3d6;--warn-ink:#6b4500;--warn-line:#e8c26a;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0d1115;--surface:#151b21;--ink:#e7ecf0;--muted:#a3afba;--line:#2a333c;
  --accent:#7d96ff;--accent-ink:#0d1115;--code-bg:#080b0e;--code-ink:#d3dde8;
  --warn-bg:#2b2208;--warn-ink:#f1d48a;--warn-line:#6b5316;
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:1rem/1.6 var(--sans);overflow-x:hidden}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-ink);padding:.6rem 1rem;z-index:10}
.skip:focus{left:0}
.wrap{max-width:68rem;margin:0 auto;padding:0 1rem}
header.top{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:5}
header.top .wrap{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;align-items:center;padding-top:.7rem;padding-bottom:.7rem}
.brand{font-weight:700;text-decoration:none;color:var(--ink);letter-spacing:-.01em}
.brand span{color:var(--muted);font-weight:400}
nav ul{display:flex;flex-wrap:wrap;gap:.2rem 1.1rem;list-style:none;margin:0;padding:0;font-size:.92rem}
nav a{color:var(--muted);text-decoration:none}
nav a:hover,nav a[aria-current]{color:var(--ink);text-decoration:underline}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0 0 .6em}
h1{font-size:clamp(1.9rem,5vw,3.1rem)}
h2{font-size:clamp(1.45rem,3vw,2rem)}
h3{font-size:1.12rem;margin-top:2rem}
p{margin:0 0 1em;max-width:68ch}
section{padding:3rem 0;border-top:1px solid var(--line)}
.hero{border-top:0;padding:3.5rem 0 3rem}
.hero .grid{display:grid;gap:2rem;grid-template-columns:minmax(0,1fr)}
@media(min-width:60rem){.hero .grid{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);align-items:center}}
.lead{font-size:1.15rem;color:var(--muted)}
.badge{display:inline-block;font-size:.85rem;background:var(--warn-bg);color:var(--warn-ink);border:1px solid var(--warn-line);border-radius:.4rem;padding:.25rem .65rem;margin-bottom:1.2rem}
.btns{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.4rem}
.btn{display:inline-block;padding:.65rem 1.1rem;border-radius:.4rem;text-decoration:none;font-weight:600;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink)}
.btn.alt{background:transparent;color:var(--accent)}
.cards{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,17rem),1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:.5rem;padding:1.1rem 1.2rem}
.card h3{margin:0 0 .4rem;font-size:1rem}
.card p{margin:0;font-size:.95rem;color:var(--muted)}
code{font-family:var(--mono);font-size:.88em;background:color-mix(in srgb,var(--line) 55%,transparent);padding:.1em .35em;border-radius:.25rem;overflow-wrap:anywhere}
.codewrap{position:relative;margin:0 0 1.2rem;max-width:100%}
pre{margin:0;background:var(--code-bg);color:var(--code-ink);border-radius:.5rem;padding:1rem;overflow-x:auto;font:.85rem/1.55 var(--mono);max-width:100%;tab-size:2}
pre code{background:none;padding:0;font-size:inherit;overflow-wrap:normal}
.copy{position:absolute;top:.4rem;right:.4rem;z-index:1;font:.75rem var(--sans);padding:.25rem .55rem;border-radius:.3rem;border:1px solid #4a5662;background:#1b2530;color:#dbe4ee;cursor:pointer}
.cap{font-size:.85rem;color:var(--muted);margin:0 0 .35rem}
.tablewrap{overflow-x:auto;max-width:100%;margin:0 0 1.2rem;border:1px solid var(--line);border-radius:.5rem;background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:34rem;font-size:.93rem}
th,td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
th{font-weight:600;background:color-mix(in srgb,var(--line) 35%,transparent)}
.diagram{background:var(--surface);border:1px solid var(--line);border-radius:.5rem;padding:1rem;overflow-x:auto}
.diagram svg{display:block;min-width:46rem;width:100%;height:auto;font-family:var(--sans)}
.diagram .box{fill:var(--bg);stroke:var(--line);stroke-width:1.5}
.diagram .own{fill:var(--bg);stroke:var(--accent);stroke-width:2}
.diagram text{fill:var(--ink);font-size:13px}
.diagram .sm{fill:var(--muted);font-size:11px;font-family:var(--mono)}
.diagram line,.diagram path{stroke:var(--muted);stroke-width:1.5;fill:none}
.diagram .skip-p{stroke-dasharray:5 4}
.three{display:grid;gap:1.2rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,18rem),1fr))}
.three .card ul{margin:.3rem 0 0;padding-left:1.1rem;font-size:.95rem;color:var(--muted)}
.three .card li{margin-bottom:.35rem}
.note{border-left:4px solid var(--accent);padding:.1rem 0 .1rem 1rem;margin:0 0 1.2rem;max-width:68ch}
.checks{list-style:none;padding:0}
.checks li{padding:.35rem 0 .35rem 1.8rem;position:relative;max-width:70ch}
.checks li::before{content:"";position:absolute;left:0;top:.65rem;width:.9rem;height:.9rem;border:2px solid var(--accent);border-radius:.2rem}
.toc{columns:2 16rem;padding-left:1.1rem}
footer{border-top:1px solid var(--line);padding:2rem 0;color:var(--muted);font-size:.92rem}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}