/* rangebound docs: the app's cool near-black and ink, no brand green; cyan marks what is clickable. JetBrains Mono for structure, IBM Plex Sans for reading */
:root {
  color-scheme: dark;
  --ground: #07080B;
  --panel: #0E1015;
  --raised: #161922;
  --line: #1F2330;
  --line-2: #2C3242;
  --ink: #EEF1F6;
  --ink-2: #B3BAC8;
  --ink-3: #7C8497;
  --ink-4: #4B5263;
  --accent: #EEF1F6;
  --accent-wash: rgba(238, 241, 246, 0.06);
  --cyan: #00C2FF;
  --warn: #FFB547;
  --f-mono: "JetBrains Mono", "SF Mono", "Fira Code", Consolas, monospace;
  --f-text: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --top: 56px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: calc(var(--top) + 16px); }
body { margin: 0; background: var(--ground); color: var(--ink-2); font: 400 16px/1.65 var(--f-text); -webkit-font-smoothing: antialiased; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; z-index: 30; background: var(--panel); padding: 6px 10px; }

/* top bar */
.top { position: sticky; top: 0; z-index: 20; height: var(--top); display: flex; align-items: center; gap: 20px;
  padding: 0 24px; background: rgba(7, 8, 11, 0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent 60%); opacity: 0.35; }
.brand { display: flex; align-items: baseline; gap: 10px; color: var(--ink); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand b { font: 700 17px/1 var(--f-mono); letter-spacing: -0.02em; }
.brand i { font-style: normal; color: var(--ink-3); }
.brand span { font: 500 11px var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }
.menu { display: none; background: none; border: 1px solid var(--line-2); color: var(--ink); width: 36px; height: 36px; padding: 0; cursor: pointer; }
.search { position: relative; flex: 1; min-width: 0; max-width: 420px; margin-left: auto; display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2); background: var(--panel); padding: 0 10px; height: 36px; color: var(--ink-3); }
.search:focus-within { border-color: var(--cyan); }
.search input { flex: 1; min-width: 0; width: 100%; background: none; border: 0; outline: 0; color: var(--ink); font: 500 13px var(--f-mono); }
.search input::-webkit-search-cancel-button { display: none; }
.search kbd { font: 500 11px var(--f-mono); border: 1px solid var(--line-2); padding: 0 5px; color: var(--ink-3); }
.results { position: absolute; top: 40px; left: -1px; right: -1px; background: var(--panel); border: 1px solid var(--line-2);
  max-height: 70vh; overflow-y: auto; box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6); }
.results a { display: block; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.results a:last-child { border-bottom: 0; }
.results a:hover, .results a[aria-selected="true"] { background: var(--raised); text-decoration: none; }
.results b { display: block; color: var(--ink); font: 600 13px var(--f-mono); }
.results small { display: block; font-size: 13px; color: var(--ink-3); line-height: 1.45; }
.results mark { background: none; color: var(--cyan); }
.results .none { padding: 12px; font-size: 14px; color: var(--ink-3); }
.app { font: 600 12px var(--f-mono); letter-spacing: 0.04em; color: #000; background: var(--accent); padding: 9px 12px; white-space: nowrap; }
.app:hover { text-decoration: none; background: #FFFFFF; }

/* three columns */
.shell { display: grid; grid-template-columns: 272px minmax(0, 1fr) 232px; max-width: 1440px; margin: 0 auto; }
.side { position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; padding: 28px 16px 48px 24px;
  border-right: 1px solid var(--line); }
.nav-group { margin-bottom: 22px; }
.nav-h { font: 600 11px var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 8px 10px; }
.side ul { list-style: none; margin: 0; padding: 0; }
.side li a { display: block; padding: 5px 10px; font-size: 14.5px; line-height: 1.4; color: var(--ink-2); border-left: 1px solid transparent; }
.side li.d1 a { margin-left: 12px; border-left-color: var(--line); font-size: 14px; color: var(--ink-3); }
.side li a:hover { color: var(--ink); text-decoration: none; background: var(--panel); }
.side li a[aria-current="page"] { color: var(--accent); background: var(--accent-wash); border-left-color: var(--accent); }

main { min-width: 0; padding: 40px 56px 80px; }
article { max-width: 740px; margin: 0 auto; }
.toc { position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; padding: 40px 24px 40px 8px; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc li a { display: block; padding: 4px 0 4px 12px; font-size: 13px; line-height: 1.4; color: var(--ink-3); margin-left: -1px; border-left: 1px solid transparent; }
.toc li.l3 a { padding-left: 24px; }
.toc li a:hover { color: var(--ink); text-decoration: none; }
.toc li a.on { color: var(--accent); border-left-color: var(--accent); }

/* article type */
.eyebrow { font: 600 11px var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.toc .eyebrow { margin-left: 0; }
h1, h2, h3 { font-family: var(--f-mono); color: var(--ink); text-wrap: balance; position: relative; }
h1 { font-size: 32px; line-height: 1.2; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 16px; }
h1 + p { font-size: 18px; color: var(--ink-2); }
h2 { font-size: 21px; line-height: 1.3; font-weight: 600; letter-spacing: -0.01em; margin: 48px 0 12px; padding-top: 20px; border-top: 1px solid var(--line); }
h3 { font-size: 16px; line-height: 1.35; font-weight: 600; margin: 32px 0 8px; }
.anchor { position: absolute; left: -22px; color: var(--ink-4); opacity: 0; font-weight: 400; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; text-decoration: none; }
p { margin: 0 0 16px; }
strong { color: var(--ink); font-weight: 600; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }
li { margin: 4px 0; }
li > ul, li > ol { margin: 4px 0 0; }
li::marker { color: var(--ink-4); }
code { font: 500 0.86em var(--f-mono); color: var(--ink); background: var(--raised); border: 1px solid var(--line); padding: 1px 5px; }
pre { margin: 0 0 20px; padding: 16px 18px; background: var(--panel); border: 1px solid var(--line); overflow-x: auto; }
pre code { background: none; border: 0; padding: 0; font-size: 13.5px; line-height: 1.6; color: var(--ink); }
.tbl { overflow-x: auto; margin: 0 0 20px; border: 1px solid var(--line); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; line-height: 1.5; font-variant-numeric: tabular-nums; }
th { text-align: left; font: 600 11px var(--f-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3);
  background: var(--panel); padding: 10px 14px; border-bottom: 1px solid var(--line); white-space: nowrap; }
td { padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
.callout { margin: 0 0 20px; padding: 14px 18px; border: 1px solid var(--line-2); background: var(--panel); }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout-h { font: 600 11px var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 6px; }
.callout.note .callout-h { color: var(--cyan); }
.callout.tip { border-color: var(--line-2); }
.callout.tip .callout-h { color: var(--accent); }
.callout.warning { border-color: rgba(255, 181, 71, 0.4); }
.callout.warning .callout-h { color: var(--warn); }
.page-foot { margin-top: 48px; font: 500 12px var(--f-mono); }
.page-foot a { color: var(--ink-3); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.pager a { display: block; padding: 14px 16px; border: 1px solid var(--line-2); color: var(--ink); font: 600 14px/1.35 var(--f-mono); }
.pager a:hover { border-color: var(--cyan); text-decoration: none; }
.pager span { display: block; font: 500 11px var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 4px; }
.pager .next { text-align: right; grid-column: 2; }

@media (max-width: 1200px) {
  .shell { grid-template-columns: 256px minmax(0, 1fr); }
  .toc { display: none; }
  main { padding: 40px 40px 80px; }
}
@media (max-width: 860px) {
  .top { gap: 12px; padding: 0 16px; }
  .menu { display: inline-flex; align-items: center; justify-content: center; }
  .shell { display: block; }
  .side { position: fixed; z-index: 15; top: var(--top); left: 0; width: min(320px, 86vw); background: var(--ground);
    transform: translateX(-100%); transition: transform 0.2s ease; }
  body.nav-open .side { transform: none; box-shadow: 16px 0 40px rgba(0, 0, 0, 0.6); }
  main { padding: 28px 16px 64px; }
  h1 { font-size: 26px; }
  .anchor { display: none; }
  .app { display: none; }
  .brand span { display: none; }
  .search kbd { display: none; }
}
@media (prefers-reduced-motion: reduce) { .side { transition: none; } }