:root {
  --bg: #fbfaf8;
  --bg-raised: #ffffff;
  --bg-sunken: #f2efea;
  --text: #1d1b18;
  --text-dim: #5d574e;
  --text-faint: #8a8279;
  --line: #e2ddd4;
  --line-strong: #cfc8bc;
  --accent: #9a4f1b;
  --accent-soft: #f4e7dc;
  --code-bg: #f1ece4;
  --ok: #2f6b3f;
  --warn: #8a5a08;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --sidebar-w: 250px;
  --toc-w: 210px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #171614;
    --bg-raised: #1f1e1b;
    --bg-sunken: #121110;
    --text: #ece8e1;
    --text-dim: #aba498;
    --text-faint: #7e766a;
    --line: #322f2a;
    --line-strong: #46413a;
    --accent: #e9a26a;
    --accent-soft: #2e241b;
    --code-bg: #242220;
  }
}

:root[data-theme='dark'] {
  --bg: #171614;
  --bg-raised: #1f1e1b;
  --bg-sunken: #121110;
  --text: #ece8e1;
  --text-dim: #aba498;
  --text-faint: #7e766a;
  --line: #322f2a;
  --line-strong: #46413a;
  --accent: #e9a26a;
  --accent-soft: #2e241b;
  --code-bg: #242220;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 70px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: #fff;
  padding: 8px 14px; z-index: 40;
}
.skip:focus { left: 8px; top: 8px; }

/* ---------------------------------------------------------------- topbar */

.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 650; color: var(--text); text-decoration: none; letter-spacing: -0.01em; white-space: nowrap; }
.brand span { color: var(--text-faint); font-weight: 400; }
.spacer { flex: 1; }

.filter {
  width: min(280px, 40vw);
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--bg-raised);
  color: var(--text);
  font: inherit; font-size: 14px;
}
.filter:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.theme-btn, .menu-btn {
  border: 1px solid var(--line-strong); background: var(--bg-raised); color: var(--text-dim);
  border-radius: 8px; width: 34px; height: 32px; cursor: pointer; font-size: 15px; line-height: 1;
}
.theme-btn:hover, .menu-btn:hover { color: var(--text); border-color: var(--accent); }
.menu-btn { display: none; }

/* ---------------------------------------------------------------- shell */

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  gap: 32px;
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
  align-items: start;
}

.sidebar {
  position: sticky; top: 53px;
  max-height: calc(100vh - 53px);
  overflow-y: auto;
  padding: 20px 0 40px;
  font-size: 14px;
}
.nav-home {
  display: block; padding: 6px 10px; margin-bottom: 14px;
  border-radius: 7px; text-decoration: none; color: var(--text-dim); font-weight: 550;
}
.nav-home:hover, .nav-home.current { background: var(--accent-soft); color: var(--accent); }
.nav-group { margin-bottom: 18px; }
.nav-title {
  margin: 0 0 6px; padding: 0 10px;
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-faint); font-weight: 600;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a {
  display: block; padding: 5px 10px; border-radius: 7px;
  color: var(--text-dim); text-decoration: none;
}
.sidebar li a:hover { background: var(--bg-sunken); color: var(--text); }
.sidebar li a.current { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.sidebar li.hidden, .nav-group.hidden { display: none; }

/* ---------------------------------------------------------------- doc */

.doc {
  min-width: 0;
  padding: 28px 0 80px;
  max-width: 100%;
}

.doc h1 {
  font-size: 30px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 18px;
}
.doc h2 {
  font-size: 22px; line-height: 1.25; letter-spacing: -0.01em;
  margin: 42px 0 12px; padding-top: 14px; border-top: 1px solid var(--line);
}
.doc h3 { font-size: 17px; margin: 28px 0 8px; }
.doc h4 { font-size: 15px; margin: 22px 0 6px; color: var(--text-dim); }

.anchor {
  float: left; margin-left: -20px; width: 20px;
  color: var(--text-faint); text-decoration: none; opacity: 0; font-weight: 400;
}
h2:hover .anchor, h3:hover .anchor { opacity: 1; }

.doc p, .doc li { color: var(--text); }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 4px 0; }
.doc blockquote {
  margin: 16px 0; padding: 2px 16px; border-left: 3px solid var(--line-strong); color: var(--text-dim);
}
.doc hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }

code {
  font-family: var(--mono); font-size: 0.875em;
  background: var(--code-bg); padding: 1px 5px; border-radius: 5px;
  overflow-wrap: break-word;
}
pre {
  background: var(--bg-sunken); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px 16px; overflow-x: auto;
}
pre code { background: none; padding: 0; font-size: 13px; line-height: 1.55; }

a.xref { text-decoration: none; }
a.xref code {
  background: var(--accent-soft); color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}
a.xref:hover code { border-bottom-color: var(--accent); }

code.ir, code.ir-demo {
  cursor: help;
  border-bottom: 1px dotted var(--text-faint);
}
code.ir:hover, code.ir:focus { background: var(--accent-soft); color: var(--accent); outline: none; }

/* tables — the docs carry wide evidence tables, so each scrolls on its own */
.doc table {
  display: block; width: 100%; overflow-x: auto;
  border-collapse: collapse; font-size: 14px; margin: 16px 0;
  border: 1px solid var(--line); border-radius: var(--radius);
}
.doc thead { background: var(--bg-sunken); }
.doc th, .doc td {
  border-bottom: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top;
}
.doc th { font-weight: 620; white-space: nowrap; }
.doc tbody tr:last-child td { border-bottom: 0; }
.doc tbody tr:hover { background: var(--bg-sunken); }

.mermaid-wrap {
  margin: 20px 0; padding: 16px; overflow-x: auto;
  background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius);
}
.mermaid { display: flex; justify-content: center; min-width: min-content; }
.mermaid svg { max-width: 100%; height: auto; }

.page-footer {
  margin-top: 56px; padding-top: 14px; border-top: 1px solid var(--line);
  color: var(--text-faint); font-size: 13px;
}
.page-footer p { margin: 0; }

/* ---------------------------------------------------------------- toc */

.toc {
  position: sticky; top: 53px;
  max-height: calc(100vh - 53px); overflow-y: auto;
  padding: 30px 0 40px; font-size: 13px;
}
.toc-title {
  margin: 0 0 8px; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-faint); font-weight: 600;
}
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc li a {
  display: block; padding: 3px 0 3px 12px; margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--text-dim); text-decoration: none;
}
.toc li a:hover { color: var(--text); }
.toc li a.active { color: var(--accent); border-left-color: var(--accent); }
.toc li.d3 a { padding-left: 24px; font-size: 12px; }
.toc code { font-size: 0.9em; background: none; padding: 0; }

/* ---------------------------------------------------------------- home */

.lede { font-size: 17px; color: var(--text-dim); max-width: 70ch; }

.stats {
  display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 8px;
}
.stats div {
  flex: 1 1 130px; background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 12px 14px;
}
.stats strong { display: block; font-size: 24px; letter-spacing: -0.02em; }
.stats span { color: var(--text-faint); font-size: 13px; }

.reading { margin: 28px 0 8px; }
.reading ol { max-width: 75ch; }
.hint { color: var(--text-dim); font-size: 14px; max-width: 75ch; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 8px; }
.card {
  background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px 18px;
}
.card h2 { margin: 0 0 6px; font-size: 17px; border: 0; padding: 0; }
.card .blurb { margin: 0 0 10px; color: var(--text-dim); font-size: 14px; }
.card-list { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.card-list li { padding: 5px 0; }
.card-list li a { font-weight: 550; }
.card-list .path {
  display: block; color: var(--text-faint); font-family: var(--mono); font-size: 11px;
  overflow-wrap: anywhere;
}

/* ---------------------------------------------------------------- IR card */

.ir-card {
  position: absolute; z-index: 50; max-width: 380px;
  background: var(--bg-raised); border: 1px solid var(--line-strong);
  border-radius: var(--radius); box-shadow: 0 8px 28px rgb(0 0 0 / 0.18);
  padding: 12px 14px; font-size: 13px; line-height: 1.5;
}
.ir-card h4 { margin: 0 0 6px; font-size: 13px; font-family: var(--mono); color: var(--accent); }
.ir-card dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; }
.ir-card dt { color: var(--text-faint); }
.ir-card dd { margin: 0; overflow-wrap: anywhere; }
.ir-card .dup { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line-strong); color: var(--warn); }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 1180px) {
  .shell { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 820px) {
  .shell { grid-template-columns: minmax(0, 1fr); padding: 0 16px; gap: 0; }
  .menu-btn { display: block; }
  .sidebar {
    position: fixed; inset: 53px auto 0 0; width: 82vw; max-width: 300px;
    background: var(--bg-raised); border-right: 1px solid var(--line);
    padding: 16px; transform: translateX(-102%); transition: transform 0.18s ease;
    z-index: 25;
  }
  .sidebar.open { transform: none; }
  .topbar { gap: 8px; padding: 10px 12px; }
  .brand span { display: none; }
  .spacer { display: none; }
  .filter { width: auto; flex: 1 1 90px; min-width: 0; }
  .doc h1 { font-size: 25px; }
  .doc { padding-top: 20px; }
  .card-list li { flex-direction: column; gap: 0; }
}