/* AI Architecture & Systems — docs site. Generated into docs/assets/site.css. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-raise: #ffffff;
  --fg: #1f2328;
  --fg-dim: #57606a;
  --fg-mute: #8c959f;
  --border: #d9dee3;
  --border-soft: #eaeef2;
  --accent: #2f6feb;
  --accent-bg: rgba(47, 111, 235, 0.09);
  --shadow: 0 6px 24px rgba(31, 35, 40, 0.10);
  --bar: 56px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117;
    --bg-soft: #11161d;
    --bg-raise: #161b22;
    --fg: #e6edf3;
    --fg-dim: #9aa4ae;
    --fg-mute: #6e7781;
    --border: #2a313c;
    --border-soft: #21262d;
    --accent: #6ea8ff;
    --accent-bg: rgba(110, 168, 255, 0.13);
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0d1117;
  --bg-soft: #11161d;
  --bg-raise: #161b22;
  --fg: #e6edf3;
  --fg-dim: #9aa4ae;
  --fg-mute: #6e7781;
  --border: #2a313c;
  --border-soft: #21262d;
  --accent: #6ea8ff;
  --accent-bg: rgba(110, 168, 255, 0.13);
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--bar) + 16px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }

/* ------------------------------------------------------------------ top bar */

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 40;
  height: var(--bar);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 650;
  font-size: 14.5px;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}

.tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  flex: 1 1 auto;
  min-width: 0;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 11px;
  border-radius: 7px;
  font-size: 13.5px;
  color: var(--fg-dim);
  white-space: nowrap;
  transition: background 0.12s, color 0.12s;
}
.tab:hover { background: var(--bg-soft); color: var(--fg); }
.tab--active { color: var(--accent); background: var(--accent-bg); font-weight: 600; }
.tab-n { font-size: 11px; color: var(--fg-mute); font-variant-numeric: tabular-nums; }
.tab--active .tab-n { color: var(--accent); }

/* ------------------------------------------------------------------- search */

.search { position: relative; flex: 0 1 260px; min-width: 120px; }

.search input {
  width: 100%;
  height: 34px;
  padding: 0 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--fg);
  font: inherit;
  font-size: 13px;
  outline: none;
}
.search input:focus { border-color: var(--accent); background: var(--bg); }
.search input::-webkit-search-cancel-button { display: none; }

.search-results {
  position: absolute;
  top: 42px;
  right: 0;
  width: min(460px, calc(100vw - 32px));
  max-height: min(60vh, 520px);
  overflow-y: auto;
  background: var(--bg-raise);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 6px;
}

.sr-group {
  padding: 8px 10px 4px;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.sr-item {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 10px;
  border-radius: 7px;
  font-size: 13.5px;
  cursor: pointer;
}
.sr-item:hover, .sr-item.is-sel { background: var(--accent-bg); }
.sr-n {
  font-size: 11.5px;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
  min-width: 42px;
  flex-shrink: 0;
}
.sr-t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sr-empty { padding: 14px 10px; color: var(--fg-mute); font-size: 13px; }

/* -------------------------------------------------------------- theme/menu */

.theme-btn, .menu-btn {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--fg-dim);
  cursor: pointer;
  padding: 0;
}
.theme-btn:hover, .menu-btn:hover { color: var(--fg); border-color: var(--fg-mute); }
.theme-btn svg { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linejoin: round; }

.menu-btn { display: none; gap: 4px; }
.menu-btn span { width: 15px; height: 1.6px; background: currentColor; border-radius: 2px; }

/* ------------------------------------------------------------------ layout */

.layout {
  display: grid;
  grid-template-columns: 272px minmax(0, 1fr) 236px;
  max-width: 1520px;
  margin: 0 auto;
  padding-top: var(--bar);
  align-items: start;
}
.layout--module { grid-template-columns: 272px minmax(0, 1fr); }
.layout--home { grid-template-columns: minmax(0, 1fr); }

/* ----------------------------------------------------------------- sidebar */

.sidebar {
  position: sticky;
  top: var(--bar);
  max-height: calc(100vh - var(--bar));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 22px 12px 48px 18px;
  border-right: 1px solid var(--border-soft);
}

.sb-head {
  padding: 0 10px 10px;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.sb-list { list-style: none; margin: 0; padding: 0; }

.sb-link {
  display: flex;
  gap: 8px;
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--fg-dim);
  border-left: 2px solid transparent;
}
.sb-link:hover { background: var(--bg-soft); color: var(--fg); }
.sb-link--active {
  color: var(--accent);
  background: var(--accent-bg);
  border-left-color: var(--accent);
  font-weight: 600;
}
.sb-n {
  flex-shrink: 0;
  font-size: 11.5px;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
  padding-top: 1px;
  min-width: 26px;
}
.sb-link--active .sb-n { color: var(--accent); }
.sb-t { min-width: 0; }

/* ----------------------------------------------------------------- content */

.content {
  min-width: 0;
  padding: 36px 44px 96px;
  max-width: 860px;
}
.layout--home .content { max-width: 1000px; margin: 0 auto; }

.crumbs {
  display: flex;
  gap: 7px;
  align-items: center;
  font-size: 12.5px;
  color: var(--fg-mute);
  margin-bottom: 12px;
}
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { color: var(--border); }

.content h1 {
  margin: 0 0 8px;
  font-size: 27px;
  line-height: 1.32;
  letter-spacing: -0.015em;
  font-weight: 680;
}
.h1-sub { color: var(--fg-mute); font-weight: 450; margin-left: 12px; font-size: 20px; }

.note {
  margin: 18px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 0 8px 8px 0;
  color: var(--fg-dim);
  font-size: 13.5px;
  line-height: 1.6;
}

.sources {
  margin: 16px 0 0;
  padding: 10px 14px;
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  background: var(--bg-soft);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fg-dim);
}
.sources-k {
  display: inline-block;
  margin-right: 8px;
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

a.ext { color: var(--accent); }
a.ext:hover { text-decoration: underline; }

/* ------------------------------------------- section page: subsection titles */

.subs { margin-top: 30px; border-top: 1px solid var(--border-soft); }

h2.sub {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  padding: 17px 2px;
  font-size: 16px;
  line-height: 1.55;
  font-weight: 560;
  letter-spacing: -0.005em;
  border-bottom: 1px solid var(--border-soft);
}
.sub-n {
  flex-shrink: 0;
  min-width: 52px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
}
.sub-t { min-width: 0; }
.hash {
  margin-left: auto;
  padding-left: 12px;
  color: var(--fg-mute);
  opacity: 0;
  font-weight: 400;
  transition: opacity 0.12s;
}
h2.sub:hover .hash { opacity: 1; }
.hash:hover { color: var(--accent); }

/* --------------------------------------------------------------- prev/next */

.prevnext {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 44px;
}
.pn {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  min-width: 0;
}
.pn:hover { border-color: var(--accent); background: var(--accent-bg); }
.pn--next { text-align: right; }
.pn-k { font-size: 11.5px; color: var(--fg-mute); }
.pn-t {
  font-size: 13.5px;
  color: var(--fg);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pn-empty { display: block; }

/* -------------------------------------------------- module page: row listing */

.rows { margin-top: 26px; border-top: 1px solid var(--border-soft); }
.row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 8px 13px 2px;
  border-bottom: 1px solid var(--border-soft);
  font-size: 15px;
}
.row:hover { background: var(--bg-soft); }
.row:hover .row-t { color: var(--accent); }
.row-n {
  flex-shrink: 0;
  min-width: 46px;
  font-size: 12.5px;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
}
.row-t { flex: 1 1 auto; min-width: 0; }
.row-c {
  flex-shrink: 0;
  font-size: 11.5px;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
}

/* -------------------------------------------------------------- right pane */

.toc {
  position: sticky;
  top: var(--bar);
  max-height: calc(100vh - var(--bar));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 36px 18px 48px 4px;
}
.toc-head {
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 10px;
}
.toc-list { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border-soft); }
.toc-list a {
  display: flex;
  gap: 7px;
  padding: 5px 10px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--fg-mute);
}
.toc-list a:hover { color: var(--fg); }
.toc-list a.is-active { color: var(--accent); border-left-color: var(--accent); }
.toc-n { flex-shrink: 0; font-variant-numeric: tabular-nums; }

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

.home-h1 { font-size: 34px; margin-bottom: 10px; }
.tagline { margin: 0 0 6px; font-size: 16px; color: var(--fg-dim); }
.meta { margin: 0 0 22px; font-size: 13px; color: var(--fg-mute); }
.meta strong { font-weight: 600; color: var(--fg-dim); }

.prose p { margin: 0 0 12px; color: var(--fg-dim); font-size: 14.5px; line-height: 1.72; }
.prose strong { color: var(--fg); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin: 30px 0 34px;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-raise);
  transition: border-color 0.12s, transform 0.12s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-h { font-size: 15.5px; font-weight: 640; letter-spacing: -0.01em; }
.card-sub { font-size: 13px; color: var(--fg-mute); margin-top: -3px; }
.card-q { font-size: 13.5px; color: var(--fg-dim); margin-top: 6px; }
.card-s { font-size: 12.5px; color: var(--fg-mute); line-height: 1.6; }
.card-n {
  margin-top: auto;
  padding-top: 10px;
  font-size: 11.5px;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
}

.src-map {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  background: var(--bg-soft);
}
.src-map summary { cursor: pointer; font-size: 14px; font-weight: 600; }
.src-map .prose { margin-top: 12px; }

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

.scrim { position: fixed; inset: var(--bar) 0 0; background: rgba(0, 0, 0, 0.4); z-index: 25; }

@media (max-width: 1180px) {
  .layout--section, .layout--module { grid-template-columns: 250px minmax(0, 1fr); }
  .toc { display: none; }
  .content { padding: 32px 32px 88px; }
}

@media (max-width: 860px) {
  .layout, .layout--module, .layout--home { grid-template-columns: minmax(0, 1fr); }
  .menu-btn { display: flex; flex-direction: column; }
  .brand { display: none; }
  .sidebar {
    position: fixed;
    top: var(--bar);
    left: 0;
    z-index: 30;
    width: 280px;
    height: calc(100vh - var(--bar));
    max-height: none;
    background: var(--bg-raise);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 0.18s ease;
  }
  body.nav-open .sidebar { transform: none; }
  .content { padding: 24px 18px 80px; }
  .content h1 { font-size: 22px; }
  .home-h1 { font-size: 26px; }
  .prevnext { grid-template-columns: 1fr; }
  .search { flex: 1 1 auto; }
}

@media (max-width: 560px) {
  .topbar { gap: 9px; padding: 0 12px; }
  .tabs { display: none; }
  .h1-sub { display: block; margin: 4px 0 0; font-size: 15px; }
  h2.sub { flex-wrap: wrap; gap: 4px 12px; font-size: 15px; }
}