/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-from: #0d1b3e;
  --bg-mid:  #0f2a5a;
  --bg-to:   #091d45;
  --surface: rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.08);
  --border:  rgba(255,255,255,0.1);
  --accent:  #4f8ef7;
  --accent-glow: rgba(79,142,247,0.25);
  --text:    #e8edf8;
  --text-muted: rgba(232,237,248,0.5);
  --text-dim:   rgba(232,237,248,0.35);
  --header-h: 60px;
  --sidebar-w: 240px;
  --toc-w: 220px;
  --content-max: 720px;
  --radius: 10px;
  --transition: 0.18s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', sans-serif;
  min-height: 100vh;
  background: linear-gradient(160deg, var(--bg-from) 0%, var(--bg-mid) 50%, var(--bg-to) 100%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ── Top Header ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(13,27,62,0.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  z-index: 100;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: contain;
}

.header-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.header-title span {
  color: var(--accent);
}

.header-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

.header-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(79,142,247,0.12);
  border: 1px solid rgba(79,142,247,0.3);
  padding: 2px 8px;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.header-spacer { flex: 1; }

.header-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  gap: 8px;
  width: 220px;
  transition: border-color var(--transition), background var(--transition);
}

.header-search:focus-within {
  border-color: rgba(79,142,247,0.5);
  background: rgba(79,142,247,0.06);
}

.search-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.45;
}

.header-search input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 13px;
  font-family: 'Inter', sans-serif;
}

.header-search input::placeholder { color: var(--text-muted); }

.search-kbd {
  font-size: 10px;
  color: var(--text-dim);
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: 'Inter', sans-serif;
  flex-shrink: 0;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
}

/* ── Page Layout ── */
.page-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--header-h);
}

/* ── Left Sidebar ── */
.sidebar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 28px 0;
  border-right: 1px solid var(--border);
  background: rgba(13,27,62,0.4);
  flex-shrink: 0;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-section-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 20px;
  margin-bottom: 6px;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px;
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  position: relative;
}

.sidebar-nav li a .nav-icon {
  font-size: 14px;
  flex-shrink: 0;
  opacity: 0.7;
  transition: opacity var(--transition);
}

.sidebar-nav li a:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.sidebar-nav li a.active {
  color: var(--accent);
  font-weight: 600;
  background: rgba(79,142,247,0.08);
  border-left-color: var(--accent);
}

.sidebar-nav li a.active .nav-icon {
  opacity: 1;
}

/* search results filtering */
.sidebar-nav li.hidden { display: none; }

/* ── Main Content ── */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  margin-right: var(--toc-w);
  padding: 48px 56px;
  min-width: 0;
}

.content-section {
  max-width: var(--content-max);
  padding-bottom: 64px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 64px;
}

.content-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

/* Section heading */
.section-eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

h1.section-title {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.25;
}

h2.section-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.3;
}

.section-lead {
  font-size: 15.5px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.75;
}

/* Prose */
.prose p {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(232,237,248,0.75);
  margin-bottom: 16px;
}

.prose h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 28px 0 10px;
  letter-spacing: -0.01em;
}

.prose ul, .prose ol {
  margin: 0 0 16px 0;
  padding-left: 20px;
}

.prose li {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(232,237,248,0.75);
  margin-bottom: 4px;
}

.prose a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.prose a:hover { border-bottom-color: var(--accent); }

.prose strong { color: var(--text); font-weight: 600; }

/* Code */
code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  background: rgba(79,142,247,0.1);
  border: 1px solid rgba(79,142,247,0.2);
  border-radius: 5px;
  padding: 2px 6px;
  color: #7db4ff;
}

pre {
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  overflow-x: auto;
  margin: 18px 0;
  position: relative;
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: 13.5px;
  color: #c8d8f8;
  line-height: 1.6;
}

/* Code block language label */
pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* Info / tip blocks */
.callout {
  display: flex;
  gap: 12px;
  padding: 16px 18px;
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
  background: rgba(79,142,247,0.06);
  margin: 20px 0;
}

.callout-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }

.callout-body { font-size: 14px; color: rgba(232,237,248,0.8); line-height: 1.65; }

.callout.tip { border-left-color: #34d399; background: rgba(52,211,153,0.06); }
.callout.warn { border-left-color: #fbbf24; background: rgba(251,191,36,0.06); }

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin: 24px 0;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  transition: background var(--transition), border-color var(--transition);
}

.feature-card:hover {
  background: var(--surface-hover);
  border-color: rgba(79,142,247,0.3);
}

.feature-icon { font-size: 22px; margin-bottom: 10px; }

.feature-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.feature-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Step list */
.step-list {
  list-style: none;
  counter-reset: steps;
  margin: 20px 0;
}

.step-list li {
  counter-increment: steps;
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  align-items: flex-start;
}

.step-list li::before {
  content: counter(steps);
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(79,142,247,0.15);
  border: 1px solid rgba(79,142,247,0.35);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

.step-content { flex: 1; }

.step-content strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.step-content p {
  font-size: 13.5px;
  color: rgba(232,237,248,0.7);
  line-height: 1.6;
  margin: 0;
}

/* API endpoint table */
.api-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 18px 0;
}

.api-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}

.api-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  color: rgba(232,237,248,0.75);
  vertical-align: top;
}

.api-table tr:last-child td { border-bottom: none; }

.api-table td:first-child code { color: #7db4ff; }

/* Badge */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.badge-blue { background: rgba(79,142,247,0.15); color: #7db4ff; border: 1px solid rgba(79,142,247,0.3); }
.badge-green { background: rgba(52,211,153,0.12); color: #6ee7c0; border: 1px solid rgba(52,211,153,0.3); }

/* ── Right TOC ── */
.toc-panel {
  position: fixed;
  top: var(--header-h);
  right: 0;
  width: var(--toc-w);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 32px 20px;
  border-left: 1px solid var(--border);
}

.toc-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.toc-nav {
  list-style: none;
}

.toc-nav li {
  margin-bottom: 2px;
}

.toc-nav li a {
  display: block;
  font-size: 12.5px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 5px;
  border-left: 2px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  line-height: 1.4;
}

.toc-nav li a:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.toc-nav li a.active {
  color: var(--accent);
  font-weight: 600;
  background: rgba(79,142,247,0.06);
  border-left-color: var(--accent);
}

.toc-nav li.toc-h3 a {
  padding-left: 18px;
  font-size: 12px;
}

/* ── Search overlay ── */
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: rgba(13,27,62,0.97);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  z-index: 200;
  display: none;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
}

.search-results.open { display: block; }

.search-result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 13.5px;
  color: var(--text-muted);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}

.search-result-item:hover,
.search-result-item.focused {
  background: var(--surface-hover);
  color: var(--text);
}

.search-result-item .result-icon { font-size: 14px; flex-shrink: 0; opacity: 0.6; }

.search-result-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.search-result-section {
  font-size: 11px;
  color: var(--text-dim);
  flex-shrink: 0;
}

.search-no-results {
  padding: 16px 14px;
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
}

/* ── Mobile overlay ── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  :root { --toc-w: 0px; }
  .toc-panel { display: none; }
  .main-content { margin-right: 0; }
}

@media (max-width: 768px) {
  :root { --sidebar-w: 0px; }

  .sidebar {
    width: 260px;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 95;
    background: rgba(10,22,50,0.98);
    backdrop-filter: blur(20px);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,0.4);
  }

  .sidebar-overlay.open { display: block; }

  .main-content {
    margin-left: 0;
    margin-right: 0;
    padding: 32px 20px;
  }

  .mobile-menu-btn { display: block; }

  .header-search { width: 160px; }
  .search-kbd { display: none; }
}

@media (max-width: 480px) {
  .header-search { display: none; }
  h1.section-title { font-size: 24px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
}