/* OS-TRAVEL Developer Portal — Design System */

:root {
  --brand-primary: #1B3A5C;
  --brand-primary-hover: #2a5280;
  --brand-accent: #C5A55A;
  --brand-accent-muted: rgba(197, 165, 90, 0.15);
  --bg-base: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-muted: #F1F5F9;
  --bg-code: #0F172A;
  --bg-code-header: #1E293B;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --border-subtle: #F1F5F9;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --ring: rgba(27, 58, 92, 0.2);
  --callout-warning-bg: #FFFBEB;
  --callout-warning-border: #F59E0B;
  --callout-warning-text: #92400E;
  --badge-post-bg: #DCFCE7;
  --badge-post-text: #166534;
  --badge-required-bg: #FEE2E2;
  --badge-required-text: #991B1B;
  --badge-optional-bg: #F1F5F9;
  --badge-optional-text: #64748B;
  --header-height: 3.5rem;
  --sidebar-width: 17rem;
  --radius: 0.75rem;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --brand-primary: #3D6A99;
  --brand-primary-hover: #4D7AB0;
  --brand-accent: #D4B96E;
  --brand-accent-muted: rgba(212, 185, 110, 0.12);
  --bg-base: #0B1120;
  --bg-surface: #111827;
  --bg-surface-elevated: #1A2332;
  --bg-muted: #1E293B;
  --bg-code: #030712;
  --bg-code-header: #0F172A;
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted: #64748B;
  --border: #1E293B;
  --border-subtle: #1A2332;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  --ring: rgba(61, 106, 153, 0.4);
  --callout-warning-bg: rgba(245, 158, 11, 0.1);
  --callout-warning-border: #D97706;
  --callout-warning-text: #FCD34D;
  --badge-post-bg: rgba(34, 197, 94, 0.15);
  --badge-post-text: #4ADE80;
  --badge-required-bg: rgba(239, 68, 68, 0.15);
  --badge-required-text: #F87171;
  --badge-optional-bg: #1E293B;
  --badge-optional-text: #94A3B8;
}

html {
  scroll-behavior: smooth;
  color-scheme: light;
}

[data-theme="dark"] {
  color-scheme: dark;
}

body {
  font-family: "Plus Jakarta Sans", "Segoe UI", system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  transition: background var(--transition), color var(--transition);
}

.font-mono, code, .code-block, .param-table td:first-child {
  font-family: "JetBrains Mono", "Consolas", monospace;
}

/* Scrollbar */
.sidebar-scroll::-webkit-scrollbar { width: 5px; }
.sidebar-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* Header */
.site-header {
  height: var(--header-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg-surface) 85%, transparent);
}

.logo-mark {
  width: 2rem;
  height: 2rem;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-hover));
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.65rem;
  letter-spacing: -0.02em;
}

/* Search trigger */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  min-width: 12rem;
}
.search-trigger:hover {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--ring);
}
.search-kbd {
  margin-left: auto;
  padding: 0.125rem 0.375rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  font-size: 0.6875rem;
  font-family: inherit;
}

/* Theme toggle */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.icon-btn:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}

/* Sidebar nav */
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4375rem 0.75rem;
  margin: 0.0625rem 0.5rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.nav-link:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}
.nav-link.active {
  background: var(--brand-accent-muted);
  color: var(--brand-primary);
  font-weight: 600;
  border-color: color-mix(in srgb, var(--brand-accent) 30%, transparent);
}
[data-theme="dark"] .nav-link.active {
  color: var(--brand-accent);
}
.nav-link.indent { padding-left: 2rem; font-size: 0.78125rem; }
.nav-link.nav-link-section { margin-top: 0.5rem; }
.nav-link svg { width: 1rem; height: 1rem; flex-shrink: 0; opacity: 0.7; }
.nav-link.active svg { opacity: 1; }

.nav-group { margin-top: 0.25rem; }
.nav-group-active .nav-group-link { color: var(--text-primary); }

.nav-group-header {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  margin: 0.5rem 0.5rem 0.125rem;
}
.nav-group-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
  padding: 0.4375rem 0.5rem;
  border-radius: 0.5rem;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition);
}
.nav-group-link:hover {
  background: var(--bg-muted);
  color: var(--text-secondary);
}
.nav-group-link.active,
.nav-group-active .nav-group-link {
  color: var(--brand-primary);
}
[data-theme="dark"] .nav-group-link.active,
[data-theme="dark"] .nav-group-active .nav-group-link {
  color: var(--brand-accent);
}
.nav-group-link svg { width: 0.875rem; height: 0.875rem; flex-shrink: 0; opacity: 0.75; }

.nav-group-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border: none;
  border-radius: 0.375rem;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
}
.nav-group-chevron:hover {
  background: var(--bg-muted);
  color: var(--text-secondary);
}
.nav-group-chevron svg { width: 0.875rem; height: 0.875rem; transition: transform var(--transition); }
.nav-group-chevron.collapsed svg { transform: rotate(-90deg); }

.nav-group-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.5rem 0.75rem;
  margin-top: 0.75rem;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
}
.nav-group-toggle:hover { color: var(--text-secondary); }
.nav-group-toggle svg { width: 0.875rem; height: 0.875rem; transition: transform var(--transition); }
.nav-group-toggle.collapsed svg { transform: rotate(-90deg); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.badge-post { background: var(--badge-post-bg); color: var(--badge-post-text); }
.badge-required { background: var(--badge-required-bg); color: var(--badge-required-text); }
.badge-optional { background: var(--badge-optional-bg); color: var(--badge-optional-text); }
.badge-version {
  background: var(--bg-muted);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  text-transform: none;
  font-weight: 600;
}

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }
.card-body { padding: 1.25rem; }

.flow-card {
  position: relative;
  overflow: hidden;
}
.flow-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
}
.flow-step {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 0.5rem;
  background: var(--brand-primary);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.quick-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: background var(--transition);
}
.quick-link:hover { background: var(--bg-muted); }
.quick-link-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.625rem;
  background: var(--brand-accent-muted);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
[data-theme="dark"] .quick-link-icon { color: var(--brand-accent); }

/* Callout */
.callout {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--callout-warning-bg);
  border-left: 3px solid var(--callout-warning-border);
  border-radius: 0 0.5rem 0.5rem 0;
  margin-bottom: 1rem;
}
.callout-text { font-size: 0.875rem; color: var(--callout-warning-text); line-height: 1.5; }
.callout-icon { flex-shrink: 0; color: var(--callout-warning-border); }

/* Param tables */
.param-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}
.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}
.param-table thead th {
  text-align: left;
  padding: 0.5rem 0.875rem;
  background: var(--bg-muted);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}
.param-table tbody tr {
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition);
}
.param-table tbody tr:last-child { border-bottom: none; }
.param-table tbody tr:hover { background: var(--bg-muted); }
.param-table td { padding: 0.4375rem 0.875rem; vertical-align: middle; line-height: 1.4; }
.param-table td:first-child { color: var(--brand-primary); font-size: 0.78125rem; }
[data-theme="dark"] .param-table td:first-child { color: var(--brand-accent); }
.param-table .field-nested { padding-left: 1rem; color: var(--text-muted); }
.param-table .col-type { color: var(--text-muted); font-size: 0.75rem; }
.param-table .col-desc { color: var(--text-secondary); }

/* Generic data table */
.data-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}
.data-table thead th {
  text-align: left;
  padding: 0.5rem 0.875rem;
  background: var(--brand-primary);
  color: white;
  font-weight: 600;
  font-size: 0.75rem;
}
[data-theme="dark"] .data-table thead th { background: var(--bg-muted); color: var(--text-primary); }
.data-table tbody tr { border-bottom: 1px solid var(--border-subtle); }
.data-table tbody tr:nth-child(even) { background: var(--bg-muted); }
.data-table td { padding: 0.4375rem 0.875rem; color: var(--text-secondary); line-height: 1.4; }

/* Code panel */
.code-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-code);
  box-shadow: var(--shadow-md);
}
.code-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 1rem;
  background: var(--bg-code-header);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-panel-tabs { display: flex; gap: 0.25rem; }
.code-tab {
  padding: 0.25rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #94A3B8;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}
.code-tab.active { background: rgba(255,255,255,0.1); color: #F1F5F9; }
.code-tab:hover:not(.active) { color: #CBD5E1; }
.copy-btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  color: #94A3B8;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 0.375rem;
  cursor: pointer;
  transition: all var(--transition);
}
.copy-btn:hover { color: #F1F5F9; border-color: rgba(255,255,255,0.2); }
.copy-btn.copied { color: #4ADE80; border-color: #4ADE80; }

.code-block {
  margin: 0;
  padding: 1rem 1.25rem;
  background: var(--bg-code);
  color: #E2E8F0;
  font-size: 0.75rem;
  line-height: 1.7;
  overflow-x: auto;
  max-height: 28rem;
}
.code-block .key { color: #7DD3FC; }
.code-block .string { color: #86EFAC; }
.code-block .number { color: #FCD34D; }
.code-block .boolean { color: #F472B6; }
.code-block .null { color: #94A3B8; }

.sequence-card .code-block {
  background: var(--bg-muted);
  color: var(--text-secondary);
  border-radius: 0.5rem;
  max-height: none;
}
.sequence-card .code-block .key,
.sequence-card .code-block .string { color: var(--text-secondary); }

/* Endpoint layout */
.endpoint-article {
  margin-bottom: 4rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--border);
}
.endpoint-article:last-child { border-bottom: none; }

.endpoint-layout {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.endpoint-header {
  margin-bottom: 0;
}

.endpoint-intro {
  margin-top: 1rem;
  margin-bottom: 0;
}

.endpoint-header .endpoint-key-points {
  margin-top: 1rem;
  margin-bottom: 1.25rem;
}

.endpoint-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.endpoint-tabs::-webkit-scrollbar { display: none; }

.endpoint-tab {
  flex-shrink: 0;
  padding: 0.625rem 1.125rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.endpoint-tab:hover {
  color: var(--text-secondary);
}
.endpoint-tab.active {
  color: var(--brand-primary);
  border-bottom-color: var(--brand-accent);
}
[data-theme="dark"] .endpoint-tab.active {
  color: var(--brand-accent);
}

.endpoint-tab-panel {
  min-height: 12rem;
}
.endpoint-tab-content {
  animation: endpointTabIn 0.15s ease-out;
}
@keyframes endpointTabIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.endpoint-key-points {
  padding: 1rem 1.25rem;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
}
.endpoint-key-points-title {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}
.endpoint-key-points-list {
  margin: 0;
  padding-left: 1.25rem;
  list-style: disc;
}
.endpoint-key-points-list li {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
}
.endpoint-key-points-list li:last-child {
  margin-bottom: 0;
}

.endpoint-examples-panel .code-panel-full {
  width: 100%;
}
.endpoint-examples-panel .code-block {
  max-height: 32rem;
  overflow: auto;
}

.endpoint-pagination {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.endpoint-pagination-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 48%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.endpoint-pagination-link:hover {
  background: var(--bg-muted);
  border-color: color-mix(in srgb, var(--brand-accent) 35%, var(--border));
  color: var(--text-primary);
}
.endpoint-pagination-next { margin-left: auto; text-align: right; }
.endpoint-pagination-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.endpoint-pagination-name {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-mono, ui-monospace, monospace);
  color: var(--brand-primary);
}
[data-theme="dark"] .endpoint-pagination-name { color: var(--brand-accent); }

/* Section headings */
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.section-subtitle {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2rem 0 1rem;
}
.section-lead { color: var(--text-secondary); line-height: 1.65; max-width: none; }

/* Main content — full width */
.main-content {
  width: 100%;
  padding: 2rem 1.25rem 3rem;
}
@media (min-width: 1024px) {
  .main-content { padding: 2.5rem 2rem 3rem; }
}
@media (min-width: 1280px) {
  .main-content { padding: 2.5rem 2.5rem 3rem; }
}

/* Integration sequence diagram */
.integration-sequence {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-surface);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.seq-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-muted);
  border-bottom: 1px solid var(--border);
}
.seq-actor {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
}
.seq-actor-api {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-hover));
  border-color: transparent;
  color: white;
}
[data-theme="dark"] .seq-actor-api {
  background: linear-gradient(135deg, #2a5280, #3D6A99);
}
.seq-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}
.seq-step {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.375rem 0;
}
.seq-step-out { flex-direction: row; }
.seq-step-in { flex-direction: row-reverse; }
.seq-lane {
  width: 7.5rem;
  flex-shrink: 0;
  display: flex;
  justify-content: center;
}
.seq-lane-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--brand-accent);
  box-shadow: 0 0 0 3px var(--brand-accent-muted);
}
.seq-track {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  min-width: 0;
}
.seq-step-out .seq-track { flex-direction: row; }
.seq-step-in .seq-track { flex-direction: row-reverse; }
.seq-line {
  flex: 1;
  height: 2px;
  min-width: 1.5rem;
  background: linear-gradient(90deg, var(--border), var(--brand-primary));
  position: relative;
}
.seq-step-in .seq-line {
  background: linear-gradient(270deg, var(--border), var(--brand-primary));
}
.seq-line::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 0; height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
}
.seq-step-out .seq-line::after {
  right: -1px;
  transform: translateY(-50%);
  border-left: 6px solid var(--brand-primary);
}
.seq-step-in .seq-line::after {
  left: -1px;
  transform: translateY(-50%);
  border-right: 6px solid var(--brand-primary);
}
.seq-message {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4375rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}
.seq-tag {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
}
.seq-tag-req { background: rgba(59, 130, 246, 0.12); color: #3B82F6; }
.seq-tag-res { background: rgba(34, 197, 94, 0.12); color: #16A34A; }
[data-theme="dark"] .seq-tag-req { color: #60A5FA; }
[data-theme="dark"] .seq-tag-res { color: #4ADE80; }

@media (max-width: 768px) {
  .seq-step { flex-direction: column !important; align-items: stretch; }
  .seq-lane { width: auto; justify-content: flex-start; }
  .seq-track { flex-direction: column !important; align-items: stretch; }
  .seq-line { width: 2px; height: 1rem; min-width: 0; min-height: 1rem; }
  .seq-line::after { display: none; }
  .seq-message { white-space: normal; }
  .seq-header { grid-template-columns: 1fr; }
}
.section-divider {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

/* Hero */
.hero {
  padding: 2.5rem 0 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}
.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--brand-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
[data-theme="dark"] .hero-title {
  background: linear-gradient(135deg, #F1F5F9 0%, var(--brand-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}
.hero-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-bottom: 1.25rem; }

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--brand-primary); }

/* Inline code */
.inline-code {
  padding: 0.125rem 0.375rem;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  font-size: 0.8125em;
  color: var(--brand-primary);
}
[data-theme="dark"] .inline-code { color: var(--brand-accent); }

/* Command palette */
.command-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
}
.command-dialog {
  width: 100%;
  max-width: 36rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.command-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
}
.command-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 0.9375rem;
  color: var(--text-primary);
  outline: none;
  font-family: inherit;
}
.command-input::placeholder { color: var(--text-muted); }
.command-results { max-height: 20rem; overflow-y: auto; padding: 0.5rem; }
.command-result {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background var(--transition);
}
.command-result:hover, .command-result.selected {
  background: var(--bg-muted);
}
.command-result-type {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  width: 4.5rem;
  flex-shrink: 0;
}
.command-result-label { font-size: 0.875rem; font-weight: 500; }
.command-result-hint { font-size: 0.75rem; color: var(--text-muted); margin-left: auto; }
.command-empty { padding: 2rem; text-align: center; color: var(--text-muted); font-size: 0.875rem; }

/* TOC */
.page-toc {
  display: none;
}
@media (min-width: 1536px) {
  .content-with-toc {
    display: grid;
    grid-template-columns: 1fr 11rem;
    gap: 2rem;
  }
  .page-toc {
    display: block;
    position: sticky;
    top: calc(var(--header-height) + 1rem);
    height: fit-content;
  }
  .page-toc-title {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
  }
  .page-toc a {
    display: block;
    padding: 0.25rem 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    padding-left: 0.75rem;
    transition: all var(--transition);
  }
  .page-toc a:hover, .page-toc a.active {
    color: var(--brand-primary);
    border-left-color: var(--brand-accent);
  }
}

/* Endpoint path */
.endpoint-path {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

section[id], article[id] {
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
}

/* Prerequisite list */
.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li {
  display: flex;
  gap: 0.75rem;
  padding: 0.5rem 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.check-list li svg { color: var(--brand-accent); flex-shrink: 0; margin-top: 0.125rem; }