/* SI Docs — dark documentation theme (VitePress-style, Higgs Dyson gold accent).
   Static, no build. Shared by /si and /si/docs pages. */

:root {
  --bg:        #161618;
  --bg-alt:    #1b1b1f;   /* sidebar / surfaces */
  --bg-soft:   #202127;   /* inline code, hover */
  --bg-code:   #131316;   /* code blocks */
  --border:    #2b2b30;
  --border-soft:#242429;

  --text:      #e8e8ea;   /* body */
  --text-strong:#ffffff;  /* headings */
  --text-dim:  #a4a4ad;   /* secondary */
  --text-mut:  #74747e;   /* muted / meta */

  --gold:      #FFE117;   /* Higgs Dyson signature accent */
  --gold-soft: rgba(255,225,23,.14);
  --gold-line: rgba(255,225,23,.35);

  --sidebar-w: 272px;
  --nav-h:     60px;
  --content-max: 720px;

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --serif:"Fraunces", Georgia, serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- top nav ---------- */
.top {
  position: fixed; inset: 0 0 auto 0; height: var(--nav-h); z-index: 30;
  display: flex; align-items: center; gap: 16px;
  padding: 0 24px;
  background: rgba(22,22,24,.82);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.top .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text-strong); }
.top .brand img { height: 26px; width: auto; display: block; }
.top .brand b { font-family: var(--serif); font-weight: 600; letter-spacing: .2px; }
.top .brand .tag { color: var(--gold); font-family: var(--serif); font-style: italic; }
.top .spacer { flex: 1; }
.top .links { display: flex; gap: 18px; align-items: center; font-size: 14px; }
.top .links a { color: var(--text-dim); }
.top .links a:hover { color: var(--text-strong); text-decoration: none; }
.top .ver { font-size: 12px; color: var(--text-mut); border: 1px solid var(--border); border-radius: 20px; padding: 2px 10px; }
.menu-btn { display: none; background: none; border: 1px solid var(--border); color: var(--text-dim);
  border-radius: 8px; width: 36px; height: 32px; cursor: pointer; font-size: 16px; }

/* ---------- layout ---------- */
.shell { display: flex; padding-top: var(--nav-h); }
.sidebar {
  position: fixed; top: var(--nav-h); bottom: 0; left: 0; width: var(--sidebar-w);
  overflow-y: auto; padding: 28px 20px 60px 24px;
  border-right: 1px solid var(--border); background: var(--bg);
}
.sidebar .group { margin-bottom: 26px; }
.sidebar .group > .label {
  font-size: 12px; text-transform: uppercase; letter-spacing: .09em;
  color: var(--text-mut); font-weight: 600; margin: 0 0 10px;
}
.sidebar a {
  display: block; color: var(--text-dim); font-size: 14.5px; padding: 6px 12px;
  border-radius: 7px; margin: 1px 0; border-left: 2px solid transparent;
}
.sidebar a:hover { color: var(--text-strong); background: var(--bg-soft); text-decoration: none; }
.sidebar a.active {
  color: var(--gold); background: var(--gold-soft);
  border-left-color: var(--gold); font-weight: 600;
}

.content { flex: 1; min-width: 0; margin-left: var(--sidebar-w); padding: 48px 56px 120px; }
.prose { max-width: var(--content-max); margin: 0 auto; }

/* ---------- typography ---------- */
.prose h1 { font-family: var(--serif); font-weight: 600; font-size: 2.3rem; line-height: 1.15;
  color: var(--text-strong); margin: 0 0 .5em; letter-spacing: -.01em; }
.prose h1 .accent { color: var(--gold); font-style: italic; }
.prose h2 { font-family: var(--serif); font-weight: 600; font-size: 1.5rem; color: var(--text-strong);
  margin: 2.4em 0 .7em; padding-top: .3em; border-top: 1px solid var(--border-soft); }
.prose h3 { font-size: 1.15rem; color: var(--text-strong); margin: 1.8em 0 .5em; }
.prose p, .prose li { color: var(--text); }
.prose .lead { font-size: 1.15rem; color: var(--text-dim); line-height: 1.6; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: .35em 0; }
.prose strong { color: var(--text-strong); }
.prose code {
  font-family: var(--mono); font-size: .88em; background: var(--bg-soft);
  padding: .18em .42em; border-radius: 5px; border: 1px solid var(--border-soft); color: #ffd; }
.prose pre {
  background: var(--bg-code); border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; overflow-x: auto; line-height: 1.6; margin: 1.4em 0; }
.prose pre code { background: none; border: 0; padding: 0; font-size: .85rem; color: #d6d6da; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.5em 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: .93rem; }
.prose th, .prose td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.prose th { color: var(--text-strong); font-weight: 600; }

/* ---------- callouts ---------- */
.note { border: 1px solid var(--border); border-left: 3px solid var(--gold);
  background: var(--bg-alt); border-radius: 10px; padding: 14px 18px; margin: 1.5em 0; }
.note .t { font-weight: 600; color: var(--gold); font-size: .82rem; text-transform: uppercase;
  letter-spacing: .06em; margin-bottom: 4px; }
.note p { margin: 0; color: var(--text-dim); }

/* ---------- prev/next + meta ---------- */
.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 3.5em;
  border-top: 1px solid var(--border); padding-top: 1.5em; }
.pager a { flex: 1; border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px;
  color: var(--text-dim); }
.pager a:hover { border-color: var(--gold-line); color: var(--text-strong); text-decoration: none; }
.pager .k { font-size: 12px; color: var(--text-mut); display: block; }
.pager .next { text-align: right; }
.updated { color: var(--text-mut); font-size: 13px; margin-top: 2.5em; }

/* ---------- landing (/si) ---------- */
.hero { max-width: 820px; margin: 40px auto 0; padding: 40px 0 10px; }
.eyebrow { color: var(--gold); font-family: var(--serif); font-style: italic; font-size: 1.05rem; }
.hero h1 { font-family: var(--serif); font-weight: 700; font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.08; margin: .2em 0 .3em; color: var(--text-strong); letter-spacing: -.015em; }
.hero h1 .accent { color: var(--gold); font-style: italic; }
.hero .sub { font-size: 1.2rem; color: var(--text-dim); max-width: 640px; line-height: 1.6; }
.cta { display: inline-flex; gap: 10px; margin-top: 28px; }
.btn { display: inline-block; padding: 11px 22px; border-radius: 10px; font-weight: 600; font-size: .95rem; }
.btn.primary { background: var(--gold); color: #1a1207; }
.btn.primary:hover { text-decoration: none; filter: brightness(1.05); }
.btn.ghost { border: 1px solid var(--border); color: var(--text-dim); }
.btn.ghost:hover { border-color: var(--gold-line); color: var(--text-strong); text-decoration: none; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px,1fr)); gap: 18px;
  max-width: 820px; margin: 56px auto; }
.card { border: 1px solid var(--border); border-radius: 14px; padding: 22px; background: var(--bg-alt);
  transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--gold-line); transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; color: var(--text-strong); font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-dim); font-size: .92rem; }
.foot { max-width: 820px; margin: 0 auto; padding: 30px 0 60px; color: var(--text-mut);
  font-size: 13px; border-top: 1px solid var(--border); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .menu-btn { display: block; }
  .sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 25;
    box-shadow: 0 0 40px rgba(0,0,0,.5); }
  .sidebar.open { transform: none; }
  .content { margin-left: 0; padding: 32px 22px 90px; }
  .top .links .hide-sm { display: none; }
}