/**
 * AegisX Design System — Shared page shell
 * Docs site chrome: sidebar (240px) · topbar · main · hero · section · subsection.
 * Token showcase primitives: swatch / semantic / type-row / spacing-row / radius-cell / shadow-cell.
 *
 * Usage: <link rel="stylesheet" href="_shared.css" />
 * Requires: tokens/css/tokens.css loaded first.
 */

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--ax-font-sans, system-ui, sans-serif);
  font-size: var(--ax-text-sm-size, 14px);
  line-height: var(--ax-text-sm-line, 20px);
  color: var(--ax-text-default);
  background: var(--ax-background-page);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ax-brand-emphasis, #303f9f); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: .9em;
  background: var(--ax-background-subtle, #f4f4f5);
  color: var(--ax-text-default, #3f3f46);
  padding: 1px 6px; border-radius: 4px;
}

/* ════════════════════════════════════════════════════════════
 * APP SHELL — 240px sidebar + main
 * ════════════════════════════════════════════════════════════ */
.app {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

/* ── Sidebar (docs nav, NOT ax-nav rail) ── */
.sidebar {
  border-right: 1px solid var(--ax-border-subtle);
  background: var(--ax-background-default);
  padding: 16px 12px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex; flex-direction: column;
  gap: 2px;
  z-index: 20;
}
.sidebar__brand {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 8px 18px;
  border-bottom: 1px solid var(--ax-border-subtle);
  margin-bottom: 12px;
  text-decoration: none;
}
.sidebar__mark {
  width: 32px; height: 32px;
  border-radius: var(--ax-radius-md);
  background: var(--ax-brand-default);
  color: var(--ax-brand-inverted, #fff);
  display: grid; place-items: center;
  font-weight: 700; font-size: 12px;
  letter-spacing: -0.02em;
}
.sidebar__brand-meta { display: flex; flex-direction: column; }
.sidebar__title { font-weight: 600; color: var(--ax-text-heading); font-size: 14px; line-height: 1.2; }
.sidebar__sub { font-family: var(--ax-font-mono); font-size: 10px; color: var(--ax-text-subtle); margin-top: 1px; }
.sidebar__group-title {
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ax-text-subtle);
  padding: 14px 8px 6px;
  font-family: var(--ax-font-mono, ui-monospace, monospace);
}
.sidebar__link {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 8px;
  border-radius: var(--ax-radius-sm);
  color: var(--ax-text-secondary);
  font-size: 13px;
  text-decoration: none !important;
  transition: background 120ms ease, color 120ms ease;
}
.sidebar__link:hover { background: var(--ax-background-subtle); color: var(--ax-text-heading); }
.sidebar__link.is-active {
  background: var(--ax-brand-faint);
  color: var(--ax-brand-emphasis);
  font-weight: 500;
}
.sidebar__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ax-border-default);
  flex-shrink: 0;
}
.sidebar__link.is-active .sidebar__dot { background: var(--ax-brand-default); }

/* ── Content area ── */
.content { min-width: 0; }

/* ── Topbar ── */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 24px;
  border-bottom: 1px solid var(--ax-border-subtle);
  background: color-mix(in srgb, var(--ax-background-default) 92%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.topbar__crumbs {
  display: flex; align-items: center; gap: 6px;
  color: var(--ax-text-secondary);
  font-size: 12px;
  font-family: var(--ax-font-mono, ui-monospace, monospace);
}
.topbar__crumbs strong { color: var(--ax-text-heading); font-weight: 600; }
.topbar__actions { display: flex; gap: 8px; align-items: center; }

/* Legacy LIGHT/DARK/AUTO segmented (used by some pages + tweaks.js syncs) */
.topbar .toggle,
.topbar__actions .toggle {
  display: inline-flex; padding: 3px; gap: 2px;
  background: var(--ax-background-subtle);
  border: 1px solid var(--ax-border-subtle);
  border-radius: var(--ax-radius-full);
}
.topbar .toggle button,
.topbar__actions .toggle button {
  all: unset;
  cursor: pointer; padding: 4px 12px;
  font-size: 10px; font-weight: 500;
  border-radius: var(--ax-radius-full);
  color: var(--ax-text-secondary);
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  letter-spacing: 0.06em;
}
.topbar .toggle button:hover,
.topbar__actions .toggle button:hover { color: var(--ax-text-heading); }
.topbar .toggle button[aria-pressed="true"],
.topbar__actions .toggle button[aria-pressed="true"] {
  background: var(--ax-brand-default);
  color: var(--ax-brand-inverted, #fff);
}

/* ── Main ── */
.main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 32px 120px;
}

/* ── Hero ── */
.hero { padding: 24px 0 40px; border-bottom: 1px solid var(--ax-border-subtle); margin-bottom: 48px; }
.hero__eyebrow {
  display: inline-block;
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 11px; font-weight: 500;
  color: var(--ax-brand-emphasis);
  background: var(--ax-brand-faint);
  padding: 4px 10px;
  border-radius: var(--ax-radius-full);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}
.hero__title {
  font-size: 44px; line-height: 1.1;
  font-weight: 600; letter-spacing: -0.025em;
  color: var(--ax-text-heading);
  margin: 0 0 14px;
  text-wrap: pretty;
}
.hero__lede {
  max-width: 680px;
  font-size: 15px; line-height: 1.65;
  color: var(--ax-text-secondary);
  margin: 0 0 24px;
  text-wrap: pretty;
}
.hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--ax-border-subtle);
}
.hero__meta-item { margin: 0; }
.hero__meta-item dt {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 10px; color: var(--ax-text-subtle);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 3px;
}
.hero__meta-item dd {
  margin: 0;
  font-size: 13px; font-weight: 500;
  color: var(--ax-text-heading);
}

/* ── Section / Subsection ── */
.section { padding: 48px 0; border-bottom: 1px solid var(--ax-border-subtle); }
.section:last-of-type { border-bottom: 0; }
.section__head { max-width: 720px; margin-bottom: 28px; }
.section__title {
  display: flex; align-items: baseline; gap: 14px;
  font-size: 26px; font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ax-text-heading);
  margin: 0 0 10px;
}
.section__num {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 12px; font-weight: 500;
  color: var(--ax-text-subtle);
  letter-spacing: 0;
}
.section__desc {
  color: var(--ax-text-secondary);
  font-size: 14px; line-height: 1.6;
  margin: 0;
  text-wrap: pretty;
}
.subsection { margin-bottom: 32px; }
.subsection:last-child { margin-bottom: 0; }
.subsection__title {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 11px; font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ax-text-subtle);
  margin: 0 0 12px;
}

/* ── Demo container (subtle wrapper replacing heavy cards) ── */
.demo {
  background: var(--ax-background-default);
  border: 1px solid var(--ax-border-subtle);
  border-radius: var(--ax-radius-lg);
  padding: 20px;
}

/* ── Grid helpers ── */
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.grid { display: grid; gap: 12px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ════════════════════════════════════════════════════════════
 * COLOR SHOWCASE — swatch rows + semantic grid
 * ════════════════════════════════════════════════════════════ */
.swatch-row {
  display: grid;
  grid-template-columns: 170px repeat(11, 1fr);
  gap: 4px;
  margin-bottom: 6px;
  align-items: stretch;
}
.swatch-row:last-child { margin-bottom: 0; }
.swatch-row__label {
  display: flex; flex-direction: column; justify-content: center;
  padding-right: 10px;
  gap: 2px;
}
.swatch-row__label strong {
  font-size: 13px;
  color: var(--ax-text-heading);
  text-transform: capitalize;
  font-weight: 600;
}
.swatch-row__label span {
  font-size: 11px;
  color: var(--ax-text-subtle);
}
.swatch {
  border-radius: var(--ax-radius-sm);
  padding: 8px 6px 6px;
  min-height: 60px;
  display: flex; flex-direction: column; justify-content: space-between;
  cursor: pointer;
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  color: rgba(255,255,255,0.96);
  border: 1px solid rgba(15,23,42,0.06);
  transition: transform 120ms ease;
}
.swatch:hover { transform: translateY(-1px); }
.swatch--light { color: rgba(15,23,42,0.82); }
.swatch__step { font-size: 10px; font-weight: 600; opacity: 0.9; }
.swatch__hex { font-size: 9px; opacity: 0.78; }

.semantic-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}
.semantic-grid--wide { grid-template-columns: repeat(8, 1fr); }
@media (max-width: 900px) {
  .semantic-grid, .semantic-grid--wide { grid-template-columns: repeat(3, 1fr); }
}
.semantic {
  background: var(--ax-background-default);
  border: 1px solid var(--ax-border-subtle);
  border-radius: var(--ax-radius-sm);
  padding: 8px;
}
.semantic__preview {
  height: 42px;
  border-radius: var(--ax-radius-sm);
  margin-bottom: 6px;
  border: 1px solid rgba(15,23,42,0.05);
}
.semantic__name {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 10px;
  color: var(--ax-text-heading);
  font-weight: 500;
  word-break: break-all;
}
.semantic__tag {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 9px;
  color: var(--ax-text-subtle);
  margin-top: 2px;
}

/* ════════════════════════════════════════════════════════════
 * TYPOGRAPHY ROWS
 * ════════════════════════════════════════════════════════════ */
.type-row {
  display: grid;
  grid-template-columns: 140px 130px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--ax-border-subtle);
}
.type-row:last-child { border-bottom: 0; }
.type-row__name {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 11px; font-weight: 500;
  color: var(--ax-text-secondary);
}
.type-row__meta {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 10px;
  color: var(--ax-text-subtle);
  line-height: 1.5;
}
.type-row__sample {
  color: var(--ax-text-heading);
  text-wrap: pretty;
}

/* ════════════════════════════════════════════════════════════
 * SPACING ROWS + GRID VIZ
 * ════════════════════════════════════════════════════════════ */
.spacing-row {
  display: grid;
  grid-template-columns: 170px 120px 1fr;
  gap: 16px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--ax-border-subtle);
}
.spacing-row:last-child { border-bottom: 0; }
.spacing-row__name {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 11px; font-weight: 500;
  color: var(--ax-text-heading);
}
.spacing-row__value {
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 11px;
  color: var(--ax-text-subtle);
}
.spacing-bar {
  height: 14px;
  background: var(--ax-brand-subtle);
  border-radius: 2px;
}

.grid-viz {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 8px;
}
.grid-viz__col {
  background: var(--ax-brand-faint);
  color: var(--ax-brand-emphasis);
  text-align: center;
  padding: 14px 4px;
  border-radius: var(--ax-radius-sm);
  font-family: var(--ax-font-mono, ui-monospace, monospace);
  font-size: 11px; font-weight: 500;
}

/* ════════════════════════════════════════════════════════════
 * RADIUS + SHADOW CELLS
 * ════════════════════════════════════════════════════════════ */
.radius-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 12px;
}
.shadow-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
@media (max-width: 900px) {
  .radius-grid { grid-template-columns: repeat(3, 1fr); }
  .shadow-grid { grid-template-columns: repeat(2, 1fr); }
}
.radius-cell {
  aspect-ratio: 1;
  background: var(--ax-brand-faint);
  color: var(--ax-brand-emphasis);
  border: 1.5px solid var(--ax-brand-subtle);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2px;
  font-family: var(--ax-font-mono, ui-monospace, monospace);
}
.radius-cell strong { font-size: 11px; font-weight: 600; color: var(--ax-text-heading); }
.radius-cell span { font-size: 10px; color: var(--ax-text-subtle); }
.shadow-cell {
  aspect-ratio: 1.3;
  background: var(--ax-background-default);
  border-radius: var(--ax-radius-md);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2px;
  font-family: var(--ax-font-mono, ui-monospace, monospace);
}
.shadow-cell strong { font-size: 12px; font-weight: 600; color: var(--ax-text-heading); }
.shadow-cell span { font-size: 10px; color: var(--ax-text-subtle); }

/* ════════════════════════════════════════════════════════════
 * DARK THEME
 * ════════════════════════════════════════════════════════════ */
[data-theme="dark"] code { background: #27272a; color: #e4e4e7; }
[data-theme="dark"] .sidebar { background: var(--ax-background-default); border-right-color: var(--ax-border-subtle); }
[data-theme="dark"] .topbar { background: color-mix(in srgb, #18181b 90%, transparent); }
[data-theme="dark"] .semantic__preview { border-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .swatch { border-color: rgba(255,255,255,0.04); }

/* ════════════════════════════════════════════════════════════
 * RESPONSIVE
 * ════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .main { padding: 24px 16px 80px; }
  .hero__title { font-size: 32px; }
  .swatch-row { grid-template-columns: 1fr; gap: 6px; }
  .swatch-row__label { padding-right: 0; }
}