:root {
  --bg: #f4f2ec; --surface: #fbfaf7; --text: #131311; --muted: #6d6b62; --line: #dcd9cf;
  --chip: #eae7dd; --accent: #ff4b00; --invert-bg: #131311; --invert-text: #f4f2ec;
  --show-light: block; --show-dark: none;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --disp: "Space Grotesk", "Inter", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101010; --surface: #171716; --text: #f0efea; --muted: #8f8e86; --line: #282826;
    --chip: #1e1e1c; --invert-bg: #f0efea; --invert-text: #101010;
    --show-light: none; --show-dark: block;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #101010; --surface: #171716; --text: #f0efea; --muted: #8f8e86; --line: #282826;
  --chip: #1e1e1c; --invert-bg: #f0efea; --invert-text: #101010;
  --show-light: none; --show-dark: block;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 400 16px/1.65 Inter, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: #fff; }
a { color: inherit; text-underline-offset: 3px; text-decoration-color: var(--line); }
a:hover { text-decoration-color: currentColor; }
img { display: block; max-width: 100%; height: auto; }
.only-light { display: var(--show-light); }
.only-dark { display: var(--show-dark); }
.gutter { padding-left: max(20px, env(safe-area-inset-left)); padding-right: max(20px, env(safe-area-inset-right)); }

header.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
header.top .bar { display: flex; align-items: center; gap: 16px; height: 60px; max-width: 1200px; margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 9px; font: 700 16px/1 var(--disp); letter-spacing: 0.01em; text-transform: uppercase; text-decoration: none; }
.brand::before { content: ""; width: 10px; height: 10px; background: var(--accent); }
.brand span { font: 500 10px/1 var(--mono); letter-spacing: 0.14em; color: var(--muted); }
.bar .right { margin-left: auto; display: flex; gap: 18px; align-items: center; font: 500 11px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.bar .right a { text-decoration: none; color: var(--muted); }
.bar .right a:hover { color: var(--text); }
.theme-btn { border: 1px solid var(--line); background: var(--surface); color: var(--text); font: 500 10px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; padding: 7px 10px; border-radius: 2px; cursor: pointer; min-width: 62px; }

.layout { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; }
aside.toc { position: sticky; top: 60px; align-self: start; max-height: calc(100vh - 60px); overflow-y: auto; padding: 32px 0; font-size: 13px; }
aside.toc p { font: 500 10px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); margin: 0 0 12px; }
aside.toc ol { list-style: none; margin: 0; padding: 0; }
aside.toc a { display: block; padding: 4px 0 4px 12px; border-left: 1px solid var(--line); text-decoration: none; color: var(--muted); }
aside.toc a:hover, aside.toc a.active { color: var(--text); border-left-color: var(--accent); }
details.toc-sm { display: none; }

main { padding: 40px 0 80px; min-width: 0; max-width: 760px; }
h1 { font: 700 clamp(34px, 6vw, 52px)/1.05 var(--disp); letter-spacing: -0.03em; margin: 0 0 14px; }
.lede { color: var(--muted); font-size: 18px; margin: 0 0 8px; }
section { padding-top: 40px; margin-top: 40px; border-top: 1px solid var(--line); }
h2 { font: 700 26px/1.2 var(--disp); letter-spacing: -0.02em; margin: 0 0 12px; }
h3 { font: 600 17px/1.3 var(--disp); margin: 28px 0 8px; letter-spacing: -0.01em; }
p { margin: 0 0 14px; }
ul, ol { padding-left: 22px; margin: 0 0 14px; }
li { margin: 4px 0; }
.muted { color: var(--muted); }
kbd { font: 500 11px/1 var(--mono); background: var(--chip); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 3px; padding: 3px 6px; white-space: nowrap; color: var(--text); }
code { font: 0.88em var(--mono); background: var(--chip); padding: 1px 5px; border-radius: 2px; }
pre { margin: 8px 0 16px; background: var(--chip); border: 1px solid var(--line); border-radius: 2px; padding: 12px 14px; overflow-x: auto; font: 13px/1.5 var(--mono); }
pre code { background: none; padding: 0; }
figure { margin: 20px 0 24px; }
figure .frame { border: 1px solid var(--line); border-radius: 0; overflow: hidden; background: var(--surface); }
figcaption { font: 500 10px/1.5 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-top: 8px; }
.note { border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--surface); padding: 12px 16px; border-radius: 2px; font-size: 15px; margin: 16px 0; }
.note p:last-child { margin: 0; }
.table-wrap { overflow-x: auto; margin: 12px 0 20px; border: 1px solid var(--line); border-radius: 2px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { font-weight: 600; background: var(--chip); font-size: 13px; }
td:first-child { white-space: nowrap; }
.keys-group { margin-top: 24px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 0; }
  aside.toc { display: none; }
  details.toc-sm { display: block; margin: 20px 0 0; border: 1px solid var(--line); border-radius: 2px; background: var(--surface); }
  details.toc-sm summary { padding: 10px 14px; cursor: pointer; font-weight: 600; font-size: 14px; }
  details.toc-sm ol { margin: 0; padding: 0 14px 12px 34px; font-size: 14px; }
  .bar .right .hide-sm { display: none; }
  main { padding-top: 24px; }
}

/* Language switch */
.lang { position: relative; }
.lang-btn { display: inline-flex; align-items: center; gap: 5px; padding: 6px 8px; border: 1px solid transparent; border-radius: 2px; background: transparent; color: var(--muted); font: 500 10px/1 var(--mono); letter-spacing: 0.08em; cursor: pointer; }
.lang-btn svg { width: 9px; height: 6px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.lang-btn:hover { color: var(--text); }
.lang[data-open] .lang-btn { color: var(--text); background: var(--surface); border-color: var(--line); }
.lang-menu { position: absolute; top: calc(100% + 6px); right: 0; z-index: 60; display: none; min-width: 150px; margin: 0; padding: 5px; list-style: none; background: var(--surface); border: 1px solid var(--line); border-radius: 2px; box-shadow: 0 16px 32px -20px rgba(0, 0, 0, 0.45); }
.lang[data-open] .lang-menu { display: block; }
.lang-menu a { display: block; padding: 7px 9px; border-radius: 2px; font: 500 12.5px/1.3 Inter, system-ui, sans-serif; letter-spacing: 0; text-transform: none; color: var(--text); text-decoration: none; }
.lang-menu a:hover { background: var(--chip); }
.lang-menu a[aria-current="true"] { color: var(--accent); }

/* Page footer (contact) */
.page-footer { max-width: 1200px; margin: 0 auto; padding-top: 24px; padding-bottom: 48px; border-top: 1px solid var(--line); font: 400 11px/1.7 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }
.page-footer .inner { display: flex; gap: 20px; flex-wrap: wrap; justify-content: space-between; }
.page-footer a { color: var(--text); text-decoration-color: var(--line); }
.page-footer a:hover { text-decoration-color: currentColor; }