/* HEADING OS documentation — shared stylesheet.
   Light, palatinate accent on white. Single canonical docs theme (the former dark
   theme was retired 2026-06-27; this file was migrated to light 2026-06-30 so the
   sidebar site pages match the markdown-generated guides). Self-contained; one
   optional Google Fonts link per page. */

:root {
  --bg: #f4f6fb;
  --bg-2: #ffffff;
  --panel: #ffffff;
  --panel-2: #eef2f9;
  --border: #e3e8f2;
  --border-2: #ccd5e6;
  --text: #1c2433;
  --text-dim: #475067;
  --text-faint: #79839a;
  --accent: #2456d6;
  --accent-2: #0e7a96;
  --accent-deep: #163d9e;
  --accent-purple: #6d3fc4;
  --link: #2456d6;
  --warn: #9a6a00;
  --danger: #c0392b;
  --ok: #157a4a;
  --code-bg: #f6f8fc;
  --shadow: 0 4px 20px rgba(20, 30, 60, 0.08);
  --shadow-sm: 0 1px 3px rgba(20, 30, 60, 0.06);
  --radius: 10px;
  --maxw: 980px;
  --sidebar-w: 290px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Layout ---------- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  padding: 26px 20px 60px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  margin-bottom: 4px;
}
.sidebar .brand .mark {
  width: 30px; height: 30px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-purple));
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 0.95rem;
}
.sidebar .brand .brand-logo {
  width: 30px; height: 30px; border-radius: 7px;
  object-fit: contain; display: block; flex: 0 0 30px;
}
.sidebar .tagline { color: var(--text-faint); font-size: 0.78rem; margin: 0 0 22px 40px; }

.nav-group { margin-bottom: 20px; }
.nav-group .label {
  text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.7rem;
  color: var(--text-faint); margin-bottom: 8px; font-weight: 600;
}
.nav-group a {
  display: block; padding: 7px 12px; border-radius: 7px;
  color: var(--text-dim); text-decoration: none; font-size: 0.92rem;
  transition: background .12s, color .12s;
}
.nav-group a:hover { background: var(--panel-2); color: var(--text); }
.nav-group a.active { background: var(--panel-2); color: var(--accent-deep); font-weight: 600; box-shadow: inset 2px 0 0 var(--accent); }

.content {
  flex: 1 1 auto;
  min-width: 0;
  padding: 48px 56px 100px;
  max-width: calc(var(--maxw) + 112px);
  margin: 0 auto;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.25; color: var(--text); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: 2.1rem; margin: 0 0 8px; }
h2 { font-size: 1.5rem; margin: 44px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.18rem; margin: 30px 0 10px; color: var(--accent-2); }
h4 { font-size: 1.02rem; margin: 22px 0 8px; color: var(--text); }
p { margin: 12px 0; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { color: var(--text); }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 36px 0; }

.lede { font-size: 1.12rem; color: var(--text-dim); margin: 0 0 12px; }

.page-meta { color: var(--text-faint); font-size: 0.82rem; margin-bottom: 28px; }

/* ---------- Code ---------- */
code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--code-bg); border: 1px solid var(--border);
  padding: 1px 6px; border-radius: 5px; color: var(--accent-deep);
}
pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px; overflow-x: auto;
  margin: 14px 0; line-height: 1.55;
}
pre code { background: none; border: none; padding: 0; color: var(--text); font-size: 0.84rem; }
pre .c { color: var(--text-faint); } /* comment span if used */

/* codehilite (markdown-generated pages) — minimal readable light palette */
.codehilite { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); margin: 14px 0; }
.codehilite pre { background: none; border: none; margin: 0; }
.codehilite .k, .codehilite .kn { color: var(--accent-purple); }
.codehilite .s, .codehilite .s1, .codehilite .s2 { color: var(--ok); }
.codehilite .c, .codehilite .c1 { color: var(--text-faint); font-style: italic; }
.codehilite .nb { color: var(--accent-2); }
.codehilite .mi, .codehilite .mf { color: var(--warn); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
th, td { text-align: left; padding: 9px 12px; border: 1px solid var(--border); vertical-align: top; }
th { background: var(--panel-2); color: var(--accent-deep); font-weight: 600; }
tr:nth-child(even) td { background: var(--panel-2); }
td code { white-space: nowrap; }

/* ---------- Callouts / admonitions ---------- */
.callout, .admonition {
  border: 1px solid var(--border); border-left-width: 4px;
  background: var(--panel); border-radius: 8px; padding: 12px 16px; margin: 18px 0;
  box-shadow: var(--shadow-sm);
}
.callout .ttl, .admonition .admonition-title { font-weight: 700; color: var(--text); display: block; margin-bottom: 3px; }
.callout.note, .admonition.note { border-left-color: var(--accent); }
.callout.warn, .admonition.warning { border-left-color: var(--warn); }
.callout.danger, .admonition.danger { border-left-color: var(--danger); }
.callout.tip, .admonition.tip { border-left-color: var(--ok); }

blockquote {
  border-left: 3px solid var(--accent); padding: 4px 16px; margin: 16px 0;
  background: var(--panel-2); color: var(--text-dim);
  border-radius: 0 8px 8px 0;
}

/* ---------- Hero (index) ---------- */
.hero {
  background: radial-gradient(120% 140% at 0% 0%, rgba(36,86,214,.08), transparent 55%),
              radial-gradient(120% 140% at 100% 0%, rgba(109,63,196,.07), transparent 55%),
              var(--panel);
  border: 1px solid var(--border); border-radius: 16px;
  padding: 44px 40px; margin-bottom: 36px; box-shadow: var(--shadow);
}
.hero h1 { font-size: 2.6rem; margin-bottom: 12px; }
.hero .sub { font-size: 1.18rem; color: var(--text-dim); max-width: 70ch; }
.badge-row { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.badge {
  font-size: 0.78rem; padding: 4px 11px; border-radius: 999px;
  background: var(--panel-2); border: 1px solid var(--border-2); color: var(--text-dim);
}

/* ---------- Card grid ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin: 22px 0; }
.card {
  display: block; background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px; text-decoration: none; color: inherit;
  box-shadow: var(--shadow-sm);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); text-decoration: none; }
.card .num { color: var(--accent); font-weight: 700; font-size: 0.8rem; letter-spacing: .04em; }
.card h3 { margin: 6px 0 6px; color: var(--text); }
.card p { margin: 0; color: var(--text-dim); font-size: 0.9rem; }

/* ---------- Footer ---------- */
.foot { margin-top: 60px; padding-top: 24px; border-top: 1px solid var(--border); color: var(--text-faint); font-size: 0.84rem; }
.foot a { color: var(--text-dim); }

/* ---------- Mobile ---------- */
.menu-toggle { display: none; }
@media (max-width: 920px) {
  .layout { flex-direction: column; }
  .sidebar {
    width: 100%; flex-basis: auto; height: auto; position: static;
    border-right: none; border-bottom: 1px solid var(--border); padding: 16px 20px;
  }
  .content { padding: 28px 22px 80px; }
  .hero { padding: 30px 22px; }
  .hero h1 { font-size: 2rem; }
  .menu-toggle {
    display: inline-block; background: var(--panel-2); color: var(--text);
    border: 1px solid var(--border-2); border-radius: 7px; padding: 6px 12px; cursor: pointer; font-size: 0.9rem;
  }
  .nav-body { display: none; margin-top: 14px; }
  .nav-body.open { display: block; }
}