:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --sidebar: #0f172a;
  --sidebar-text: #cbd5e1;
  --sidebar-muted: #94a3b8;
  --sidebar-active: #1e293b;
  --sidebar-accent: #60a5fa;
  --text: #172033;
  --muted: #657089;
  --line: #dce3ef;
  --accent: #2563eb;
  --code-bg: #eef2ff;
  --pre-bg: #0f172a;
  --pre-text: #e2e8f0;
  --topbar-h: 56px;
  --sidebar-w: 280px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--accent);
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: var(--sidebar);
  color: white;
  border-bottom: 1px solid #1e293b;
}

.topbar-title {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.topbar-links {
  margin-left: auto;
  display: flex;
  gap: 14px;
  font-size: 13px;
}

.topbar-links a {
  color: #93c5fd;
  text-decoration: none;
}

.topbar-links a:hover {
  text-decoration: underline;
}

.menu-toggle {
  display: none;
  border: 1px solid #334155;
  background: #1e293b;
  color: white;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 14px;
}

.layout {
  display: flex;
  min-height: 100%;
  padding-top: var(--topbar-h);
}

.sidebar {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  overflow: auto;
  background: var(--sidebar);
  color: var(--sidebar-text);
  border-right: 1px solid #1e293b;
  padding: 16px 0 32px;
}

.sidebar-section {
  margin-bottom: 8px;
}

.sidebar-section-title {
  padding: 8px 20px 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sidebar-muted);
}

.sidebar-item {
  display: block;
  padding: 8px 20px 8px 24px;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.35;
  border-left: 3px solid transparent;
}

.sidebar-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: white;
}

.sidebar-item.active {
  background: var(--sidebar-active);
  color: white;
  border-left-color: var(--sidebar-accent);
}

.sidebar-item-desc {
  display: block;
  font-size: 12px;
  color: var(--sidebar-muted);
  margin-top: 2px;
}

.content-panel {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
  padding: 28px 32px 64px;
}

.content-loading,
.content-error {
  color: var(--muted);
  font-size: 15px;
}

.prose {
  max-width: 860px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 36px;
  line-height: 1.65;
  font-size: 15px;
}

.prose > :first-child {
  margin-top: 0;
}

.prose h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.prose h2 {
  font-size: 1.35rem;
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.prose h3 {
  font-size: 1.1rem;
  margin: 24px 0 8px;
}

.prose h4 {
  font-size: 1rem;
  margin: 20px 0 8px;
}

.prose p,
.prose ul,
.prose ol,
.prose table,
.prose pre,
.prose blockquote {
  margin: 0 0 16px;
}

.prose ul,
.prose ol {
  padding-left: 24px;
}

.prose li {
  margin: 4px 0;
}

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

.prose code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.92em;
}

.prose pre {
  background: var(--pre-bg);
  color: var(--pre-text);
  padding: 16px 18px;
  border-radius: 12px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}

.prose pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.prose blockquote {
  margin-left: 0;
  padding: 12px 16px;
  border-left: 4px solid var(--accent);
  background: #f8fafc;
  color: var(--muted);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.prose th,
.prose td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: #f8fafc;
  font-weight: 600;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.prose a {
  text-decoration: none;
}

.prose a:hover {
  text-decoration: underline;
}

.prose img {
  max-width: 100%;
}

.sidebar-admin-toggle {
  width: 100%;
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid #334155;
  border-radius: 8px;
  background: #1e293b;
  color: #cbd5e1;
  cursor: pointer;
  font-size: 13px;
}

.sidebar-admin-toggle:hover {
  background: #334155;
}

.sidebar-admin {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #334155;
}

@media (max-width: 960px) {
  .menu-toggle {
    display: inline-block;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 30;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .content-panel {
    margin-left: 0;
    padding: 20px 16px 48px;
  }

  .prose {
    padding: 24px 20px;
  }
}