:root{color-scheme:light dark;--bg:#f7f8fa;--fg:#14171b;--muted:#52606d;--card:#fff;--border:#d9dfe7;--accent:#224cc5;--chip:#edf1f7;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}
.code-sample{margin:18px 0;background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;min-width:0}
.code-sample-toolbar{display:flex;justify-content:flex-end;align-items:center;padding:6px 10px;border-bottom:1px solid var(--border)}
.code-sample pre{margin:0;border:0;border-radius:0;background:transparent}
.code-copy-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:112px;padding:8px 12px;border:1px solid var(--border);border-radius:8px;background:var(--card);color:var(--fg);font:600 13px/1.5 var(--sans);cursor:pointer}
.code-copy-button[aria-disabled="true"]{cursor:wait}
.code-copy-button[data-copy-state="success"]{background:var(--chip)}
.code-sample .copy-status{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.prose h2:has(.heading-permalink),.prose h3:has(.heading-permalink){position:relative;padding-right:32px}
.heading-permalink{position:absolute;right:0;top:2px;display:inline-block;padding:2px 6px;border-radius:5px;color:var(--muted);font-size:14px;line-height:20px;text-decoration:none}
.heading-permalink:hover{color:var(--fg);background:var(--chip);text-decoration:none}
.reference-shot{border:1px solid var(--border);border-radius:14px;padding:10px;background:var(--card)}
.reference-shot>a{display:block;border-radius:8px;overflow:hidden}
.reference-shot img{display:block;width:100%;height:auto;border-radius:8px}
.reference-shot figcaption{padding:12px 0 0;margin:0;font-size:13px;line-height:1.65;color:var(--muted)}
.reference-diagram{padding:18px;border:1px solid var(--border);border-radius:14px;background:var(--card)}
.reference-diagram ol,.reference-flow{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;padding:0;list-style:none;counter-reset:reference-step}
.reference-flow{grid-template-columns:repeat(4,minmax(0,1fr))}
.reference-diagram ol>li,.reference-flow>li{counter-increment:reference-step;min-width:0;margin:0;padding:14px;border:1px solid var(--border);border-radius:10px;font-size:14px}
.reference-diagram ol>li::before,.reference-flow>li::before{content:counter(reference-step);display:block;font-weight:750;color:var(--accent);margin-bottom:8px}
.reference-diagram ol>li strong,.reference-flow>li strong{display:block;margin-bottom:6px}
.reference-diagram figcaption,.reference-scope figcaption{font-size:13px;line-height:1.65;color:var(--muted)}
[data-reference-example]{margin:20px 0}
[data-reference-example] h3{font-size:18px}
.example-effect{font-size:13px;color:var(--muted)}
@media(max-width:850px){.reference-diagram ol,.reference-flow{grid-template-columns:1fr}.reference-shot{padding:6px}.reference-diagram{padding:14px}}
@media(max-width:520px){.reference-scope table{min-width:0;font-size:13px;table-layout:fixed}.reference-scope th,.reference-scope td{padding:9px 7px;overflow-wrap:anywhere}}
@media(prefers-color-scheme:dark){:root{--bg:#0d1014;--fg:#e8ebf0;--muted:#adb7c5;--card:#161b21;--border:#35404d;--accent:#9bb6ff;--chip:#202b3b}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 var(--sans)}a{color:var(--accent);text-decoration:none}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}img{max-width:100%;height:auto}
.site-nav{border-bottom:1px solid var(--border);padding:16px max(18px,calc((100% - 1160px)/2));display:flex;align-items:center;flex-wrap:wrap;gap:15px}.site-nav .brand{display:flex;align-items:center;gap:8px;font-weight:850;font-size:19px;text-decoration:none;color:var(--fg);white-space:nowrap}.site-links{display:flex;flex-wrap:wrap;gap:8px 18px;margin-left:auto}.site-links a{font-size:14px;font-weight:650}
.skip{position:absolute;top:-100px;left:12px;padding:10px;background:var(--card);z-index:10}.skip:focus{top:8px}
main{max-width:1160px;margin:auto;padding:24px 22px 64px;min-width:0}.breadcrumb{font-size:13px;color:var(--muted);margin:0 0 30px}.kicker{text-transform:uppercase;letter-spacing:.07em;font-size:12px;font-weight:800;color:var(--accent)}h1,h2,h3{line-height:1.2;letter-spacing:-.025em;overflow-wrap:anywhere}h1{font-size:clamp(32px,5vw,48px);max-width:24ch;margin:10px 0 20px}h2{font-size:27px;scroll-margin-top:24px;margin:38px 0 15px}h3{font-size:20px;margin:24px 0 10px}.lede{font-size:20px;color:var(--muted);max-width:65ch}.review{font-size:13px;color:var(--muted);margin:22px 0}.review code{overflow-wrap:anywhere}
.layout{display:grid;grid-template-columns:minmax(0,76ch) minmax(180px,1fr);gap:48px;align-items:start}.prose{min-width:0}.prose p,.prose li{max-width:76ch}.prose li{margin:9px 0}pre{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;white-space:pre-wrap;overflow-wrap:anywhere;max-width:100%;overflow:auto}code{font:13px/1.7 ui-monospace,SFMono-Regular,Menlo,monospace}p code,li code{background:var(--chip);padding:2px 4px;border-radius:4px}
.notice,.recovery{border:1px solid var(--border);border-left:4px solid var(--accent);background:var(--card);border-radius:12px;padding:16px 20px;margin:24px 0}.notice p,.recovery p{margin:6px 0}.toc{position:sticky;top:24px;border:1px solid var(--border);border-radius:12px;padding:16px;font-size:14px}.toc nav{display:grid;gap:10px;margin-top:12px}summary{cursor:pointer;font-weight:700}
.flow{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:24px 0}.flow div,.tile{min-width:0;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px}.flow b{display:block;color:var(--accent);margin-bottom:8px}.flow p{font-size:14px;margin:0}.tiles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.tile h2,.tile h3{margin:0 0 12px}.tile p{font-size:15px;margin:10px 0}.label{display:inline-block;background:var(--chip);color:var(--fg);border-radius:6px;padding:3px 8px;font-size:12px;font-weight:750}.table-wrap{overflow:auto;max-width:100%;border:1px solid var(--border);border-radius:12px}table{border-collapse:collapse;min-width:600px;font-size:14px;width:100%}th,td{text-align:left;vertical-align:top;padding:12px;border-bottom:1px solid var(--border)}th{background:var(--chip)}caption{text-align:left;padding:12px;font-weight:700}.table-wrap:focus-visible{outline-offset:2px}
figure{margin:24px 0}figcaption{font-size:14px;color:var(--muted);margin-top:12px}footer{border-top:1px solid var(--border);padding:28px 22px;color:var(--muted);font-size:14px}footer .links{display:flex;flex-wrap:wrap;gap:18px;max-width:1116px;margin:auto}.search-row{display:flex;flex-wrap:wrap;gap:10px}.search-row input{flex:1;min-width:160px;padding:12px;background:var(--card);color:var(--fg);border:1px solid var(--border);border-radius:8px;font:inherit}button{font:inherit;background:var(--card);color:var(--accent);border:1px solid var(--border);border-radius:8px;padding:10px 14px;cursor:pointer}button[aria-pressed=true]{background:var(--chip);color:var(--fg);font-weight:700}
@media(max-width:850px){.layout{grid-template-columns:1fr;gap:20px}.toc{position:static;grid-row:1}.site-links{margin-left:0}.flow{grid-template-columns:1fr}}
@media(max-width:520px){main{padding:22px 16px 48px}.tiles{grid-template-columns:1fr}.lede{font-size:18px}.site-nav{padding:14px 16px}.site-links{gap:8px 14px}.review{font-size:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
[hidden]{display:none!important}#reference-search label{display:block;margin:14px 0 6px;font-weight:650}#reference-search select{max-width:100%;padding:10px;background:var(--card);color:var(--fg);border:1px solid var(--border);border-radius:8px;font:inherit}[data-reference-group]{margin:12px 0;padding:14px;border:1px solid var(--border);border-radius:10px}.reference-results{padding-left:22px}.reference-results p{margin:4px 0 16px;font-size:14px;color:var(--muted)}dt{font-weight:750;scroll-margin-top:24px}dd{margin:6px 0 20px;overflow-wrap:anywhere}td code{overflow-wrap:anywhere}

/* Structural links (nav, footer, toc, breadcrumb, tiles, buttons) are
   controls and opt out above; a prose link keeps a quiet reading cue at
   rest (not color alone) and swaps to the same modern hover every other
   control uses -- a color shift plus a chip-like background tint, never
   a thicker underline. */
main p:not(.breadcrumb) a:not(.btn),main li a,.fine a,.privacy-callout p a{
  text-decoration:underline;
  text-decoration-color:color-mix(in srgb,currentColor 45%,transparent);
  text-decoration-thickness:1px;
  text-underline-offset:4px;
  border-radius:4px;
  transition:color var(--interactive-time) ease,background-color var(--interactive-time) ease;
}
@media(hover:hover) and (pointer:fine){
  main p:not(.breadcrumb) a:not(.btn):hover,main li a:hover,.fine a:hover,.privacy-callout p a:hover{
    text-decoration:none;
    color:color-mix(in srgb,var(--accent) 75%,var(--fg) 25%);
    background:var(--interactive-nav);
    padding:.05em .15em;
    margin:-.05em -.15em;
    box-decoration-break:clone;
    -webkit-box-decoration-break:clone;
  }
}
body{-webkit-font-smoothing:antialiased}
.site-nav{min-height:76px;gap:16px;padding:14px max(22px,calc((100% - 1160px)/2))}
.site-nav .site-links{gap:4px}
.site-nav .site-links a{display:inline-flex;align-items:center;min-height:40px;padding:8px 11px;border-radius:8px;font-size:14px;font-weight:600;line-height:1.5;color:var(--muted);text-decoration:none;transition:background-color .16s,color .16s}
.site-nav .site-links a[aria-current]:not([aria-current="false"]){color:var(--fg);background:var(--chip);box-shadow:inset 0 0 0 1px var(--border)}
.site-nav .brand:hover{text-decoration:none}
.breadcrumb a{color:var(--muted);font-weight:650;text-decoration:none}
.breadcrumb a:hover{color:var(--fg);text-decoration:none}
.toc{background:var(--card);border-color:var(--border);padding:20px;border-radius:14px}
.toc summary{font-size:12px;letter-spacing:.035em;color:var(--muted)}
.toc nav{gap:4px;margin-top:16px}
.toc a{color:var(--muted);border-left:2px solid var(--border);padding:7px 10px;line-height:1.5;text-decoration:none;border-radius:0 6px 6px 0}
.toc a:hover,.toc a:focus-visible{color:var(--fg);border-left-color:var(--accent);background:var(--chip);text-decoration:none}
.tiles{gap:18px}
.tile{position:relative;padding:24px;border-radius:16px;transition:border-color .16s,box-shadow .16s}
.tile h2,.tile h3{line-height:1.35;letter-spacing:-.015em;padding-right:20px}
.tile h2 a,.tile h3 a{color:var(--fg);text-decoration:none}
/* The empty pseudo-element expands the one title link's hit area, not its name. */
.tile h2 a::after,.tile h3 a::after{content:"";position:absolute;inset:0;border-radius:inherit}
.tile:has(h2 a)::before,.tile:has(h3 a)::before{content:"";position:absolute;right:24px;top:26px;width:8px;height:8px;border-top:1.5px solid var(--muted);border-right:1.5px solid var(--muted);transform:rotate(45deg)}
.tile p{color:var(--muted)}
.tile a:not(h2 a,h3 a){position:relative;z-index:1}
.reference-results{list-style:none;padding:0}
.reference-results>li{position:relative;padding:10px 12px;border-radius:8px;border-bottom:1px solid var(--border)}
.reference-results>li>a{font-weight:650;color:var(--fg);text-decoration:none}
.reference-results>li>a:hover{color:var(--accent);text-decoration:none}
.reference-results p{margin:4px 0 6px}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:var(--fg);text-decoration:none}
@media(max-width:700px){.site-nav .site-links{width:100%;margin-left:0;gap:4px}.site-nav{padding:14px 16px;gap:10px}.site-nav .site-links a{padding:8px 5px;font-size:13px}}
@media(max-width:520px){.tile{padding:20px}.tile:has(h2 a)::before,.tile:has(h3 a)::before{right:20px;top:23px}}
/* Stationary interaction system. Layout and kind indicators never animate. */
:root{
  --interactive-bg:color-mix(in srgb,var(--fg) 4%,var(--card));
  --interactive-border:color-mix(in srgb,var(--fg) 24%,var(--border));
  --interactive-nav:color-mix(in srgb,var(--fg) 5%,transparent);
  --interactive-time:160ms;
}
.site-nav .site-links a{
  transition:color var(--interactive-time) ease,background-color var(--interactive-time) ease;
}
.site-nav .site-links a[aria-current]:not([aria-current="false"]){
  background:var(--interactive-nav);
  box-shadow:none;
  color:var(--fg);
}
.site-nav .site-links a[aria-current]:not([aria-current="false"])::after{
  content:"";position:absolute;left:11px;right:11px;bottom:3px;height:2px;
  border-radius:2px;background:var(--accent);
}
.site-nav .site-links a{position:relative}
.topic,.tile,.card{
  transition:background-color var(--interactive-time) ease,
    border-top-color var(--interactive-time) ease,border-right-color var(--interactive-time) ease,
    border-bottom-color var(--interactive-time) ease;
}
.topic,.tile{box-shadow:none}
.topic h3,.tile h2 a,.tile h3 a{color:var(--fg)}
.tile:focus-within{box-shadow:none}
.tile:has(a:focus-visible){outline:3px solid var(--accent);outline-offset:3px}
.tile h2 a:focus-visible,.tile h3 a:focus-visible{outline:none}
.btn,button:not(.card),.chip,.proj{
  transition:background-color var(--interactive-time) ease,border-color var(--interactive-time) ease,
    color var(--interactive-time) ease;
}
.btn{box-shadow:none}
a.btn,a.topic,.site-nav a{ text-decoration:none }
a,button{ -webkit-tap-highlight-color:transparent }
@media(hover:hover) and (pointer:fine){
  .site-nav .site-links a:hover{color:var(--fg);background:var(--interactive-nav);text-decoration:none}
  .topic:hover,.tile:has(h2 a:hover),.tile:has(h3 a:hover),.card:hover{
    background:var(--interactive-bg);
    border-top-color:var(--interactive-border);
    border-right-color:var(--interactive-border);
    border-bottom-color:var(--interactive-border);
  }
  .topic:hover{border-left-color:var(--interactive-border)}
  .topic:hover,.tile:has(a:hover){box-shadow:none}
  .tile h2 a:hover,.tile h3 a:hover{color:var(--fg);text-decoration:none}
  .tile:has(a:hover)::before{border-color:var(--fg)}
  .btn:hover:not(:disabled):not([aria-disabled="true"]){
    transform:none;opacity:1;text-decoration:none;
    background:color-mix(in srgb,var(--accent) 92%,var(--fg));
  }
  .btn.ghost:hover:not(:disabled),button:not(.btn):not(.card):not(:disabled):not([aria-pressed="true"]):hover{
    background:var(--interactive-bg);border-color:var(--interactive-border);
  }
  .btn.kill:hover:not(:disabled){background:color-mix(in srgb,var(--err) 92%,var(--fg))}
}
.btn:active:not(:disabled):not([aria-disabled="true"]){transform:none;opacity:1;background:color-mix(in srgb,var(--accent) 84%,var(--fg))}
.btn.ghost:active:not(:disabled){background:var(--chip)}
.btn.kill:active:not(:disabled){background:color-mix(in srgb,var(--err) 84%,var(--fg))}
a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}