/* Agent OS Atlas — "Command Center / Agent Mesh" identity.
   Primary = agentic violet (distinct from the cyan AI atlas and the copper low-level
   atlas). Secondary = operational teal. Amber is reserved for the scheduler/cron layer.
   Surfaces = deep indigo-graphite with a faint node-mesh backdrop, like an automation
   cockpit. Named color vars keep their original keys so .accent-<name> classes stay
   valid; the hues are remapped onto the agent-mesh operational spectrum.
   --on-accent = the text color to sit on top of a filled --accent surface. */
:root {
  color-scheme: light dark;
  --bg: #f4f4fb;
  --bg-2: #eceaf6;
  --panel: #ffffff;
  --panel-2: #f7f6fc;
  --panel-3: #efedf8;
  --border: #ddd9ee;
  --border-2: #e8e5f3;
  --border-strong: #c4bedd;
  --fg: #15131f;
  --fg-soft: #353049;
  --muted: #6a6580;
  --muted-2: #847f99;
  --accent: #6d28d9;
  --accent-2: #0d9488;
  --accent-3: #7c3aed;
  --accent-soft: rgba(109, 40, 217, .10);
  --accent-line: rgba(109, 40, 217, .22);
  --on-accent: #ffffff;
  --cyan: #0e8aa8;
  --sky: #2a7db0;
  --blue: #2f63c4;
  --indigo: #4f46e5;
  --violet: #6d28d9;
  --fuchsia: #b3329a;
  --teal: #0d9488;
  --emerald: #128a55;
  --amber: #b07414;
  --orange: #c2611f;
  --rose: #c2564a;
  --red: #c63434;
  --slate: #5b667d;
  --shadow-card: 0 1px 2px rgba(24, 18, 48, .06), 0 10px 24px rgba(24, 18, 48, .07);
  --shadow-hover: 0 6px 18px rgba(24, 18, 48, .13);
  --topbar-h: 62px;
  --sidebar-w: 272px;
  --rightrail-w: 250px;
  --radius: 8px;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, ui-monospace, monospace;
}

html[data-theme="dark"] {
  --bg: #0a0b14;
  --bg-2: #0c0e19;
  --panel: #14161f;
  --panel-2: #11131c;
  --panel-3: #1b1e2b;
  --border: #272b3c;
  --border-2: #1d2030;
  --border-strong: #3a3f55;
  --fg: #e7e9f3;
  --fg-soft: #c7cbdc;
  --muted: #8a90a6;
  --muted-2: #686e84;
  --accent: #a78bfa;
  --accent-2: #2dd4bf;
  --accent-3: #c4b5fd;
  --accent-soft: rgba(167, 139, 250, .14);
  --accent-line: rgba(167, 139, 250, .30);
  --on-accent: #0a0b14;
  --cyan: #34d3ee;
  --sky: #56b6e0;
  --blue: #6ea8fe;
  --indigo: #8b9cff;
  --violet: #a78bfa;
  --fuchsia: #e07bd0;
  --teal: #2dd4bf;
  --emerald: #5fe0a0;
  --amber: #f0b45a;
  --orange: #f59e6a;
  --rose: #f4928a;
  --red: #f87171;
  --slate: #9aa6bd;
  --shadow-card: 0 1px 1px rgba(0, 0, 0, .32), 0 12px 32px rgba(0, 0, 0, .30);
  --shadow-hover: 0 10px 32px rgba(0, 0, 0, .40);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-width: 0; max-width: 100vw; overflow-x: clip; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 18px); }
body {
  min-height: 100vh;
  color: var(--fg);
  /* Agent mesh — nodes sitting on a faint orthogonal grid, like a control-plane /
     automation cockpit backdrop (distinct from the AI atlas line grid and the
     low-level atlas perfboard dots). */
  background:
    radial-gradient(circle at center, var(--border-strong) 1.1px, transparent 1.6px),
    linear-gradient(var(--border-2) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-2) 1px, transparent 1px),
    var(--bg);
  background-size: 52px 52px, 52px 52px, 52px 52px, auto;
  background-position: -1px -1px, 0 0, 0 0, 0 0;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
html[data-theme="dark"] body {
  /* Mesh nodes + grid on indigo-graphite, with a violet command-light glow up top
     and a faint teal one bottom-right — the operational two-accent signature. */
  background:
    radial-gradient(circle at center, var(--border-strong) 1.1px, transparent 1.6px),
    linear-gradient(var(--border-2) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-2) 1px, transparent 1px),
    radial-gradient(1100px 560px at 14% -10%, rgba(167, 139, 250, .09), transparent 60%),
    radial-gradient(900px 480px at 96% 108%, rgba(45, 212, 191, .05), transparent 60%),
    var(--bg);
  background-size: 52px 52px, 52px 52px, 52px 52px, 100% 100%, 100% 100%, auto;
  background-position: -1px -1px, 0 0, 0 0, 0 0, 0 0, 0 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .001ms !important;
  }
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
svg { width: 18px; height: 18px; flex-shrink: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 9px 15px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 800;
  transform: translateY(-160%);
  transition: transform .15s ease;
}
.skip-link:focus { transform: translateY(0); text-decoration: none; outline: 2px solid var(--fg); }
.content:focus { outline: none; }

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
}
.main-col { min-width: 0; min-height: 100vh; display: flex; flex-direction: column; }
.main-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rightrail-w);
  align-items: start;
}
.app.no-toc .main-row { grid-template-columns: minmax(0, 1fr); }

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  max-height: 100vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px 14px 0;
  background: color-mix(in srgb, var(--panel) 96%, transparent);
  border-right: 1px solid var(--border);
  scrollbar-width: thin;
  z-index: 90;
}
html[data-theme="dark"] .sidebar { background: rgba(22, 24, 29, .96); }
.sidebar summary { display: flex; list-style: none; cursor: pointer; }
.sidebar summary::-webkit-details-marker { display: none; }
.sidebar-head { display: flex; flex-direction: column; gap: 12px; }
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--fg);
  padding: 4px 5px;
}
.sidebar-brand:hover { text-decoration: none; }
.brand-icon {
  width: 38px;
  height: 38px;
  padding: 9px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
}
.brand-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.1; }
.brand-title { font-size: 15px; font-weight: 800; color: var(--fg); letter-spacing: 0; }
.brand-sub { margin-top: 2px; font-size: 11px; color: var(--muted); }

.theme-toggle {
  width: 100%;
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-2);
  color: var(--fg-soft);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 650;
}
.theme-toggle:hover { background: var(--panel-3); }
.theme-toggle .label-light,
.theme-toggle .label-dark { display: inline-flex; align-items: center; gap: 7px; }
html[data-theme="dark"] .theme-toggle .label-light { display: none; }
html:not([data-theme="dark"]) .theme-toggle .label-dark { display: none; }
.toggle-pill {
  width: 31px;
  height: 18px;
  border-radius: 999px;
  background: var(--border-strong);
  position: relative;
}
.toggle-pill::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  left: 2px;
  top: 2px;
  border-radius: 50%;
  background: var(--panel);
  box-shadow: 0 1px 2px rgba(0,0,0,.18);
  transition: transform .16s;
}
html[data-theme="dark"] .toggle-pill { background: var(--accent); }
html[data-theme="dark"] .toggle-pill::after { transform: translateX(13px); background: #0a0b14; }

.sidebar-body { display: flex; flex-direction: column; gap: 8px; flex: 1; }
.sidebar-home,
.sidebar-link,
.nav-child,
.nav-leaf {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 30px;
  padding: 7px 9px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.35;
}
.sidebar-home {
  margin-bottom: 4px;
  color: var(--fg-soft);
  border: 1px solid var(--border);
  background: var(--bg-2);
  font-weight: 750;
}
.sidebar-home:hover,
.sidebar-link:hover,
.nav-child:hover,
.nav-leaf:hover {
  background: var(--panel-3);
  color: var(--fg);
  text-decoration: none;
}
.sidebar-link.active,
.nav-child.active,
.nav-leaf.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 750;
}
.sidebar-section { display: flex; flex-direction: column; gap: 2px; }
.sidebar-section h3 {
  margin: 8px 0 5px;
  padding: 0 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--muted-2);
  text-transform: uppercase;
  letter-spacing: .12em;
}
.nav-group,
.nav-branch { border-radius: var(--radius); }
.nav-group > summary,
.nav-branch > summary {
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 9px;
  border-radius: 7px;
  color: var(--fg-soft);
  user-select: none;
  font-size: 12.5px;
  font-weight: 720;
}
.nav-group > summary:hover,
.nav-branch > summary:hover { background: var(--panel-3); }
.nav-summary-left,
.nav-summary-right { display: inline-flex; align-items: center; gap: 8px; min-width: 0; }
.nav-summary-left span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.phase-num {
  display: inline-block;
  min-width: 20px;
  margin-right: 7px;
  font-family: var(--font-mono);
  color: var(--accent);
}
.count {
  min-width: 22px;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--muted);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
}
.chev { width: 14px; height: 14px; color: var(--muted-2); transition: transform .15s; }
details[open] > summary .chev { transform: rotate(180deg); }
.sec-ico,
.branch-ico { width: 16px; height: 16px; color: var(--muted-2); }
.nav-children,
.nav-leaves {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin-left: 10px;
  padding-left: 10px;
  border-left: 1px solid var(--border-2);
}
.nav-leaf {
  display: block;
  min-height: 0;
  padding: 5px 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 12px;
}
.nav-leaf-overview {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted-2);
}
.sidebar-footer {
  position: sticky;
  bottom: 0;
  margin-top: auto;
  padding: 13px 8px 15px;
  border-top: 1px solid var(--border-2);
  background: inherit;
  color: var(--muted-2);
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 80;
  width: 100%;
  height: var(--topbar-h);
  display: grid;
  grid-template-columns: minmax(360px, 620px) auto;
  align-items: center;
  gap: 14px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  backdrop-filter: blur(12px) saturate(1.1);
  justify-content: space-between;
}
html[data-theme="dark"] .topbar { background: rgba(22, 24, 29, .92); }
.menu-toggle { display: none !important; }
.icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--fg-soft);
  cursor: pointer;
}
.icon-btn:hover { border-color: var(--border); background: var(--panel-3); color: var(--fg); }
.search-shell { position: relative; min-width: 0; max-width: 620px; justify-self: center; width: 100%; }
.search-shell input {
  width: 100%;
  height: 39px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-2);
  color: var(--fg);
  padding: 0 44px 0 39px;
  outline: 0;
  font: inherit;
  font-size: 13.5px;
}
.search-shell input:focus {
  border-color: var(--accent);
  background: var(--panel);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-shell input::placeholder { color: var(--muted-2); }
.search-ico {
  position: absolute;
  left: 12px;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  color: var(--muted-2);
  pointer-events: none;
}
.search-shell kbd {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--panel);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
}
.topbar-actions { display: flex; align-items: center; gap: 8px; }
.lang-switch {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-2);
}
.lang-link {
  min-width: 35px;
  padding: 8px 9px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}
.lang-link:hover { background: var(--panel-3); color: var(--fg); text-decoration: none; }
.lang-link.active { background: var(--accent-soft); color: var(--accent); }
.github-link {
  height: 36px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 11px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg-soft);
  background: var(--panel);
  font-size: 13px;
  font-weight: 700;
}
.github-link:hover { background: var(--panel-3); color: var(--fg); text-decoration: none; }

#search-results {
  position: fixed;
  top: calc(var(--topbar-h) + 10px);
  left: calc(var(--sidebar-w) + ((100vw - var(--sidebar-w)) / 2));
  transform: translateX(-50%);
  z-index: 120;
  width: min(620px, calc(100vw - var(--sidebar-w) - 48px));
  max-height: 68vh;
  overflow-y: auto;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hover);
}
#search-results[hidden] { display: none; }
#search-results .results-meta,
#search-results .empty {
  padding: 8px 10px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
}
#search-results .hit {
  display: block;
  padding: 10px;
  border-radius: 7px;
  color: var(--fg);
}
#search-results .hit:hover,
#search-results .hit.active { background: var(--panel-3); text-decoration: none; }
#search-results .hit strong { display: block; font-size: 13.5px; }
#search-results .hit span { color: var(--muted); font-family: var(--font-mono); font-size: 11px; }
#search-results .hit p { margin: 4px 0 0; color: var(--muted); font-size: 12.5px; line-height: 1.45; }
#search-results mark { background: var(--accent-soft); color: var(--accent); border-radius: 3px; padding: 0 2px; }

.content {
  width: 100%;
  max-width: 1220px;
  min-width: 0;
  margin: 0 auto;
  padding: 34px clamp(22px, 4vw, 42px) 58px;
}
.article-home { max-width: 1160px; }
.article-note,
.page-hero,
.breadcrumbs { max-width: 78ch; }
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  margin-bottom: 12px;
}
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--accent); text-decoration: none; }
.breadcrumbs .sep { color: var(--muted-2); }
.page-hero { margin-bottom: 14px; }
.page-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.meta-chip {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: capitalize;
}
.meta-chip.tag,
.meta-chip[class*="accent-"] { background: var(--accent-soft); color: var(--accent); border-color: transparent; }

.home-hero {
  margin-bottom: 34px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.hero-crumb {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 14px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}
.home-hero h1 {
  margin: 0;
  font-size: 3rem;
  line-height: 1.05;
  letter-spacing: 0;
}
.hero-subtitle {
  margin: 8px 0 0;
  color: var(--accent-2);
  font-size: 1rem;
  font-weight: 750;
}
.home-hero .lede {
  max-width: 760px;
  margin: 18px 0 24px;
  color: var(--muted);
  font-size: 1.05rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 10px 15px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-weight: 800;
}
.btn:hover { text-decoration: none; }
.btn-primary { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-3); border-color: var(--accent-3); color: var(--on-accent); }
.btn-ghost { color: var(--fg-soft); background: var(--panel); }
.btn-ghost:hover { background: var(--panel-3); color: var(--fg); }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  max-width: 860px;
}
.hero-stat {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-card);
}
.hero-stat svg { color: var(--accent); }
.hero-stat div { min-width: 0; display: flex; flex-direction: column; }
.hero-stat strong { font-size: 1.2rem; line-height: 1; color: var(--fg); }
.hero-stat span { color: var(--muted); font-size: 12px; font-weight: 650; }

/* The operating rule — a command-center band of term = definition cells. */
.rule-strip {
  margin-bottom: 30px;
  padding: 18px 20px 20px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, var(--accent-soft), transparent 70%),
    var(--panel);
  box-shadow: var(--shadow-card);
}
.rule-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}
.rule-cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg-2);
}
.rule-term { color: var(--accent); font-weight: 800; font-size: 13.5px; }
.rule-eq { color: var(--muted-2); font-family: var(--font-mono); font-size: 11px; }
.rule-def { color: var(--fg-soft); font-size: 12.5px; }

.section-eyebrow {
  display: inline-flex;
  margin-bottom: 7px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
}
.path-intro,
.reference-panel,
.featured-card,
.branch-card,
.related-card,
.branch-nav-link {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-card);
}
.path-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 22px;
  margin-bottom: 24px;
  border-left: 3px solid var(--accent);
}
.path-intro h2,
.phase-section h2,
.reference-panel h2,
.featured-card h2 {
  margin: 0 0 7px;
  color: var(--fg);
  font-size: 1.35rem;
  line-height: 1.2;
  letter-spacing: 0;
}
.path-intro p,
.phase-section-head p,
.reference-panel p,
.featured-card p {
  margin: 0;
  color: var(--muted);
}
.path-intro-cta,
.phs-open {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--accent);
  font-weight: 800;
  white-space: nowrap;
}
.path-intro-cta:hover,
.phs-open:hover { color: var(--accent-2); text-decoration: none; }

.branch-card:hover,
.featured-card:hover,
.related-card:hover,
.branch-nav-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-strong);
  text-decoration: none;
}
.phase-section { margin-bottom: 42px; scroll-margin-top: calc(var(--topbar-h) + 14px); }
.phase-section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 15px;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.phs-num {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 850;
}
.phs-eyebrow {
  margin-bottom: 3px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.branch-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.branch-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  padding: 17px;
  color: inherit;
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.bc-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.bc-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--branch) 12%, transparent);
  color: var(--branch);
  border: 1px solid color-mix(in srgb, var(--branch) 25%, transparent);
}
.bc-count {
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  white-space: nowrap;
}
.branch-card h3 { margin: 0; color: var(--fg); font-size: 1rem; line-height: 1.25; }
.branch-card p { margin: 0; color: var(--muted); font-size: 13px; flex: 1; }
.bc-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
}
.branch-card.accent-cyan { --branch: var(--cyan); }
.branch-card.accent-sky { --branch: var(--sky); }
.branch-card.accent-blue { --branch: var(--blue); }
.branch-card.accent-indigo { --branch: var(--indigo); }
.branch-card.accent-violet { --branch: var(--violet); }
.branch-card.accent-fuchsia { --branch: var(--fuchsia); }
.branch-card.accent-teal { --branch: var(--teal); }
.branch-card.accent-emerald { --branch: var(--emerald); }
.branch-card.accent-amber { --branch: var(--amber); }
.branch-card.accent-orange { --branch: var(--orange); }
.branch-card.accent-rose { --branch: var(--rose); }
.branch-card.accent-red { --branch: var(--red); }
.branch-card.accent-slate { --branch: var(--slate); }

.featured-section { margin-bottom: 36px; }
.featured-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 22px;
  color: inherit;
  border-left: 3px solid var(--violet);
}
.pill {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 10px;
  padding: 4px 9px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--violet) 12%, transparent);
  color: var(--violet);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.tag-row span {
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}
.featured-arrow { color: var(--accent); width: 24px; height: 24px; }
.reference-panel { padding: 22px; margin-bottom: 32px; }
.reference-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.reference-list a {
  display: inline-flex;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg-2);
  color: var(--fg-soft);
  font-family: var(--font-mono);
  font-size: 12px;
}
.reference-list a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.home-footer {
  display: flex;
  justify-content: space-between;
  gap: 22px;
  flex-wrap: wrap;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}
.home-footer strong { color: var(--fg); }
.home-footer p { margin: 5px 0 0; max-width: 56ch; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; font-weight: 750; }

.article-note h1 {
  margin: 8px 0 14px;
  color: var(--fg);
  font-size: 2.15rem;
  line-height: 1.12;
  letter-spacing: 0;
}
.article-note h2 {
  margin-top: 2rem;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border);
  color: var(--fg);
  font-size: 1.36rem;
  letter-spacing: 0;
}
.article-note h3 { margin-top: 1.5rem; color: var(--fg); font-size: 1.06rem; }
.article-note p,
.article-note li { color: var(--fg-soft); }
.article-note p { margin: 1rem 0; }
.article-note ul,
.article-note ol { padding-left: 1.35rem; }
.article-note blockquote {
  margin: 1.1rem 0;
  padding: 10px 13px;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--accent-soft);
}
.article-note code {
  padding: 1px 5px;
  border: 1px solid var(--border-2);
  border-radius: 5px;
  background: var(--bg-2);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: .92em;
}
.article-note pre {
  overflow-x: auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
}
.article-note pre code { padding: 0; border: 0; background: transparent; }
.article-note table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.1rem 0;
  font-size: .93rem;
}
.article-note th,
.article-note td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.article-note th { background: var(--panel-2); color: var(--fg); }
.unresolved-link { color: var(--red); border-bottom: 1px dashed var(--red); }
.translation-pending {
  margin-bottom: 18px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--muted);
}

.toc {
  position: sticky;
  top: calc(var(--topbar-h) + 20px);
  align-self: start;
  max-height: calc(100vh - var(--topbar-h) - 24px);
  overflow-y: auto;
  padding: 24px 20px;
  border-left: 1px solid var(--border);
  color: var(--muted);
}
.toc h2 {
  margin: 0 0 10px;
  color: var(--muted-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .12em;
}
.toc a {
  display: block;
  padding: 5px 0 5px 10px;
  border-left: 1px solid var(--border-2);
  color: var(--muted);
  font-size: 12.5px;
}
.toc a:hover { border-left-color: var(--accent); color: var(--accent); text-decoration: none; }
.toc-level-3 { padding-left: 22px !important; font-size: 12px !important; }
.back-to-top { margin-top: 10px; font-family: var(--font-mono); }
.branch-nav,
.related-notes {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.branch-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.branch-nav-link,
.related-card {
  display: block;
  padding: 13px;
  color: inherit;
}
.branch-nav-link span,
.related-card span {
  display: block;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  margin-bottom: 4px;
}
.branch-nav-link strong,
.related-card strong { color: var(--fg); }
.branch-nav-link.next { text-align: right; }
.related-notes h2 {
  margin: 0 0 12px;
  color: var(--fg);
  font-size: 1.15rem;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.related-card small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.45;
}

@media (max-width: 1180px) {
  :root { --sidebar-w: 248px; }
  .branch-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .main-row { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 780px) {
  :root { --topbar-h: 105px; }
  .app { display: block; }
  .main-col { display: block; }
  .topbar {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-rows: auto auto;
    height: var(--topbar-h);
    padding: 9px 12px 11px;
    gap: 8px;
  }
  .menu-toggle { display: grid !important; grid-column: 1; grid-row: 1; }
  .topbar-search { grid-column: 1 / -1; grid-row: 2; max-width: none; }
  .topbar-actions { grid-column: 3; grid-row: 1; }
  .github-link { width: 36px; padding: 0; justify-content: center; }
  .gh-label { display: none; }
  .sidebar {
    display: none;
    position: fixed;
    inset: 0 auto 0 0;
    width: min(88vw, 330px);
    height: 100dvh;
    max-height: 100dvh;
    z-index: 140;
    box-shadow: 18px 0 42px rgba(0,0,0,.28);
  }
  body.nav-open .sidebar { display: flex; }
  body.nav-open::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 130;
    background: rgba(4, 9, 18, .48);
    backdrop-filter: blur(2px);
  }
  #search-results {
    left: 12px;
    right: 12px;
    top: calc(var(--topbar-h) + 8px);
    transform: none;
    width: auto;
  }
  .content { padding: 24px 16px 46px; max-width: 100vw; }
  .article-home,
  .article-note,
  .page-hero,
  .breadcrumbs { max-width: none; }
  .home-hero h1 { font-size: 2.25rem; }
  .home-hero .lede { font-size: 1rem; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .path-intro { grid-template-columns: 1fr; padding: 18px; }
  .phase-section-head { grid-template-columns: auto minmax(0, 1fr); }
  .phs-open { grid-column: 1 / -1; justify-self: start; }
  .branch-grid,
  .related-grid,
  .branch-nav { grid-template-columns: 1fr; }
  .branch-nav-link.next { text-align: left; }
  .rule-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
  .content { padding: 20px 13px 42px; }
  .search-shell kbd { display: none; }
  .search-shell input { padding-right: 14px; }
  .home-hero h1 { font-size: 1.9rem; }
  .hero-stats { grid-template-columns: 1fr; }
  .cta-row { flex-direction: column; }
  .btn { width: 100%; }
  .phase-section-head { gap: 10px; }
  .phs-num { width: 42px; height: 42px; }
  .featured-card { grid-template-columns: 1fr; }
  .rule-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}