*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

:root {
  --doc-font: 'Inter', system-ui, -apple-system, sans-serif;
  --doc-mono: ui-monospace, 'SF Mono', 'Fira Code', monospace;

  --doc-bg: #F7F6F3;
  --doc-surface: #FFFFFF;
  --doc-border: #E4E2DC;
  --doc-text: #18181B;
  --doc-muted: #71717A;
  --doc-subtle: #A1A1AA;

  --doc-sidebar: 256px;
}

html, body { height: 100%; }

body {
  font-family: var(--doc-font);
  background: var(--doc-bg);
  color: var(--doc-text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Layout */

.layout {
  display: grid;
  grid-template-columns: var(--doc-sidebar) 1fr;
  min-height: 100vh;
}

/* Sidebar */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--doc-border);
  background: var(--doc-surface);
  padding: 2rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.logo {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--doc-text);
  text-decoration: none;
  padding: 0 0.5rem;
}

/* Nav sections (top-level dropdowns) */

.nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-section {
  display: flex;
  flex-direction: column;
}

.nav-section > summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.25rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--doc-subtle);
  cursor: pointer;
  user-select: none;
  border-radius: 6px;
}

.nav-section > summary::-webkit-details-marker { display: none; }

.nav-section > summary::after {
  content: '';
  width: 12px;
  height: 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5l3 3 3-3' stroke='%23A1A1AA' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 0.15s;
  flex-shrink: 0;
}

.nav-section[open] > summary::after {
  transform: rotate(180deg);
}

.nav-section > summary:hover {
  color: var(--doc-muted);
  background: var(--doc-bg);
}

/* Nav items inside sections */

.nav-items {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  padding: 0.25rem 0;
}

/* Nav item groups (second-level dropdowns) */

.nav-item-group {
  display: flex;
  flex-direction: column;
}

.nav-item-group > summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.625rem;
  border-radius: 6px;
  color: var(--doc-muted);
  font-size: 0.875rem;
  cursor: pointer;
  user-select: none;
  transition: color 0.1s, background 0.1s;
}

.nav-item-group > summary::-webkit-details-marker { display: none; }

.nav-item-group > summary::after {
  content: '';
  width: 10px;
  height: 10px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M2.5 3.75l2.5 2.5 2.5-2.5' stroke='%23A1A1AA' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 0.15s;
  flex-shrink: 0;
}

.nav-item-group[open] > summary::after {
  transform: rotate(180deg);
}

.nav-item-group > summary:hover {
  color: var(--doc-text);
  background: var(--doc-bg);
}

.nav-item-group > summary.active {
  color: var(--doc-text);
  font-weight: 500;
}

/* Sub-links */

.nav-sub {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  padding: 0.25rem 0 0.25rem 0.75rem;
}

.nav-sub a {
  display: block;
  padding: 0.3rem 0.625rem;
  border-radius: 6px;
  color: var(--doc-subtle);
  text-decoration: none;
  font-size: 0.8125rem;
  transition: color 0.1s, background 0.1s;
}

.nav-sub a:hover {
  color: var(--doc-text);
  background: var(--doc-bg);
}

.nav-sub a.active {
  color: var(--doc-text);
  background: var(--doc-bg);
}

/* Simple nav link (no dropdown) */

.nav-link {
  display: block;
  padding: 0.35rem 0.625rem;
  border-radius: 6px;
  color: var(--doc-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.1s, background 0.1s;
}

.nav-link:hover {
  color: var(--doc-text);
  background: var(--doc-bg);
}

.nav-link.active {
  color: var(--doc-text);
  background: var(--doc-bg);
  font-weight: 500;
}

/* Content */

.content {
  padding: 4rem 5rem;
  max-width: 900px;
}

/* Page header */

.page-header {
  margin-bottom: 3.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--doc-border);
}

.page-header h1 {
  font-size: 1.625rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.2;
  margin-bottom: 0.625rem;
}

.page-header p {
  color: var(--doc-muted);
  font-size: 0.9375rem;
  max-width: 520px;
}

/* Sections */

.section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 2rem;
}

.section-title {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--doc-subtle);
  margin-bottom: 1.25rem;
}

/* Token swatches */

.token-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1.25rem;
}

.token-swatch {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.swatch {
  height: 56px;
  border-radius: 8px;
  border: 1px solid var(--doc-border);
}

.token-name {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--doc-text);
  font-family: var(--doc-mono);
  word-break: break-all;
}

.token-value {
  font-size: 0.6875rem;
  color: var(--doc-muted);
  font-family: var(--doc-mono);
}

/* Token rows */

.token-list { display: flex; flex-direction: column; }

.token-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--doc-border);
  font-size: 0.8125rem;
}

.token-list .token-row:first-child { border-top: 1px solid var(--doc-border); }
.token-row .token-name { font-size: 0.8125rem; }
.token-row .token-value { font-size: 0.8125rem; }

.spacing-preview {
  height: 8px;
  background: var(--doc-text);
  border-radius: 2px;
  opacity: 0.12;
}

/* Component preview */

.component-preview {
  border: 1px solid var(--doc-border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.preview-canvas {
  padding: 4rem 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--doc-surface);
  min-height: 160px;
}

.preview-code {
  border-top: 1px solid var(--doc-border);
  background: var(--doc-bg);
  padding: 1.125rem 1.5rem;
}

.preview-code pre {
  font-family: var(--doc-mono);
  font-size: 0.8125rem;
  color: var(--doc-text);
  overflow-x: auto;
  line-height: 1.7;
}

/* Empty state */

.empty-state {
  padding: 2.5rem;
  border: 1px dashed var(--doc-border);
  border-radius: 10px;
  text-align: center;
  color: var(--doc-muted);
  font-size: 0.875rem;
}

/* Code block */

.code-block {
  background: var(--doc-bg);
  border: 1px solid var(--doc-border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
}

.code-block pre {
  font-family: var(--doc-mono);
  font-size: 0.8125rem;
  color: var(--doc-text);
  line-height: 1.7;
}

/* Home */

.home-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.home-card {
  padding: 1.5rem;
  background: var(--doc-surface);
  border: 1px solid var(--doc-border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--doc-text);
  transition: border-color 0.15s;
}

.home-card:hover { border-color: var(--doc-text); }

.home-card h3 {
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
}

.home-card p {
  font-size: 0.8125rem;
  color: var(--doc-muted);
}