* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  height: 100vh;
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: auto 1fr;
  background: #faf9f7;
  color: #1e293b;
}

/* Header */
.header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: #1e293b;
  border-bottom: 1px solid #334155;
}

.header h1 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #f1f5f9;
}

.header h1 a {
  color: inherit;
  text-decoration: none;
}

.header h1 span {
  color: #94a3b8;
  font-weight: 400;
}

.header-links {
  display: flex;
  gap: 16px;
  align-items: center;
}

.header-links a {
  color: #94a3b8;
  font-size: 12px;
  text-decoration: none;
  transition: color 0.15s;
}

.header-links a:hover {
  color: #e2e8f0;
}

/* Sidebar */
.sidebar {
  background: #1e293b;
  padding: 16px 0;
  overflow-y: auto;
  border-right: 1px solid #334155;
}

.sidebar-label {
  padding: 6px 16px;
  font-size: 11px;
  font-weight: 500;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 4px 8px;
}

.sidebar a {
  display: block;
  padding: 8px 12px;
  font-size: 13px;
  color: #94a3b8;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.15s;
  line-height: 1.4;
}

.sidebar a:hover {
  background: #334155;
  color: #e2e8f0;
}

.sidebar a.active {
  background: #334155;
  color: #f1f5f9;
  font-weight: 500;
}

.sidebar a .doc-desc {
  display: block;
  font-size: 11px;
  color: #475569;
  margin-top: 2px;
  font-weight: 400;
}

.sidebar a.active .doc-desc {
  color: #64748b;
}

/* Content */
.content {
  overflow-y: auto;
  padding: 48px 80px 48px 60px;
  min-width: 0;
}

.content-inner {
  max-width: 780px;
  width: 100%;
}

/* Loading / Error */
.loading {
  color: #64748b;
  font-size: 14px;
}

.error {
  color: #ef4444;
  font-size: 14px;
}

/* Markdown content styles */
.md h1 {
  font-size: 28px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 8px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.md h2 {
  font-size: 20px;
  font-weight: 600;
  color: #0f172a;
  margin-top: 40px;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid #e7e5e4;
  line-height: 1.3;
}

.md h3 {
  font-size: 16px;
  font-weight: 600;
  color: #1e293b;
  margin-top: 28px;
  margin-bottom: 8px;
  line-height: 1.4;
}

.md h4 {
  font-size: 14px;
  font-weight: 600;
  color: #334155;
  margin-top: 20px;
  margin-bottom: 6px;
}

.md p {
  font-size: 15px;
  line-height: 1.7;
  color: #334155;
  margin-bottom: 16px;
}

.md ul, .md ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.md li {
  font-size: 15px;
  line-height: 1.7;
  color: #334155;
  margin-bottom: 4px;
}

.md li > ul, .md li > ol {
  margin-top: 4px;
  margin-bottom: 4px;
}

.md a {
  color: #2563eb;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.md a:hover {
  border-bottom-color: #2563eb;
}

.md strong {
  font-weight: 600;
  color: #1e293b;
}

.md hr {
  border: none;
  border-top: 1px solid #e7e5e4;
  margin: 32px 0;
}

.md blockquote {
  border-left: 3px solid #cbd5e1;
  padding: 8px 16px;
  margin-bottom: 16px;
  color: #475569;
  background: #f8fafc;
  border-radius: 0 4px 4px 0;
}

.md blockquote p {
  margin-bottom: 0;
  color: #475569;
}

/* Code */
.md code {
  font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 13px;
  background: #f1efe9;
  padding: 2px 6px;
  border-radius: 3px;
  color: #1e293b;
}

.md pre {
  margin-bottom: 16px;
  border-radius: 6px;
  overflow-x: auto;
  background: #0f172a;
  border: 1px solid #1e293b;
}

.md pre code {
  display: block;
  padding: 16px;
  background: none;
  color: #e2e8f0;
  font-size: 13px;
  line-height: 1.6;
  border-radius: 0;
}

/* Tables */
.md table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 14px;
}

.md thead th {
  text-align: left;
  padding: 8px 12px;
  font-weight: 600;
  color: #1e293b;
  border-bottom: 2px solid #d6d3d1;
  background: #f5f5f4;
}

.md tbody td {
  padding: 8px 12px;
  border-bottom: 1px solid #e7e5e4;
  color: #334155;
  vertical-align: top;
}

.md tbody tr:hover {
  background: #fafaf9;
}

.md tbody td code {
  font-size: 12.5px;
  white-space: nowrap;
}

/* Overlay (mobile only — must not participate in grid) */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

/* Mobile */
@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr;
  }

  .menu-toggle {
    display: block;
  }

  .sidebar {
    position: fixed;
    top: 37px;
    left: 0;
    bottom: 0;
    width: 260px;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.3);
  }

  .overlay {
    inset: 37px 0 0 0;
    background: rgba(0, 0, 0, 0.4);
  }

  .overlay.open {
    display: block;
  }

  .content {
    padding: 32px 20px;
  }

  .md h1 { font-size: 24px; }
  .md h2 { font-size: 18px; }

  .md pre code {
    font-size: 12px;
  }

  .md table {
    font-size: 13px;
    display: block;
    overflow-x: auto;
  }
}