:root {
  --color-bg: #fbf9f7;
  --color-surface: #ffffff;
  --color-border: #e6ded9;
  --color-text: #2c2226;
  --color-text-secondary: #6b5c62;
  --color-accent: #7a2438;
  --color-accent-soft: #f3e4e8;
  --color-code-bg: #f4efec;
  --font-heading: Georgia, 'Times New Roman', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 10px;
  --sidebar-width: 17rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1c1518;
    --color-surface: #241b1f;
    --color-border: #3a2d32;
    --color-text: #f2e9ea;
    --color-text-secondary: #b8a3a9;
    --color-accent: #e08095;
    --color-accent-soft: #3a232b;
    --color-code-bg: #2a2024;
  }
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.55;
}

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

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  flex: none;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 1.75rem 1.25rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar__brand {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-text);
  margin-bottom: 0.15rem;
}

.sidebar__tagline {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  margin: 0 0 1.5rem;
}

.sidebar nav ul {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.sidebar nav p.sidebar__label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  color: var(--color-text-secondary);
  margin: 1.25rem 0 0.5rem;
  font-weight: 600;
}

.sidebar nav a {
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.92rem;
}

.sidebar nav a:hover {
  background: var(--color-accent-soft);
}

.sidebar nav a[aria-current='page'] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 600;
}

.sidebar__toggle {
  display: none;
}

.content {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem 5rem;
  max-width: 56rem;
}

.content h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin: 0 0 0.35rem;
}

.content .kicker {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 1.5rem;
}

.content h2 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  margin: 2.25rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
}

.content h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

.content p {
  color: var(--color-text);
}

.lede {
  font-size: 1.08rem;
  color: var(--color-text);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 2rem;
}

.meta-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}

.meta-card dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  margin: 0 0 0.25rem;
}

.meta-card dd {
  margin: 0;
  font-size: 0.9rem;
}

.callout {
  background: var(--color-accent-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.callout strong {
  color: var(--color-accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 2rem;
  font-size: 0.88rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

th {
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

code {
  font-family: var(--font-mono);
  background: var(--color-code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.block-list {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 2rem;
}

.block-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: var(--color-surface);
}

.block-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.index-card {
  display: block;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-surface);
}

.index-card:hover {
  border-color: var(--color-accent);
}

.index-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--color-text);
}

.index-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.page-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

@media screen and (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .sidebar nav {
    display: none;
  }

  .sidebar__toggle {
    display: inline-block;
    margin-top: 0.5rem;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.85rem;
    cursor: pointer;
  }

  .sidebar.is-open nav {
    display: block;
  }

  .content {
    padding: 2rem 1.25rem 4rem;
  }
}