:root {
  --fg: #222;
  --fg-muted: #555;
  --fg-subtle: #888;
  --bg: #fff;
  --bg-elevated: #fafafa;
  --bg-code: #f6f8fa;
  --bg-inline-code: #f0f0f0;
  --border: #eee;
  --border-strong: #d0d0d0;
  --accent: #0a58ca;
  --accent-soft-bg: #f0f4ff;
  --chip-id-bg: #fff3d8;
  --chip-id-fg: #6b4a00;
  --chip-label-fg: #2a4a8a;
  --kid-active-bg: #fff8e1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e6e6;
    --fg-muted: #b5b5b5;
    --fg-subtle: #888;
    --bg: #14161a;
    --bg-elevated: #1c1f24;
    --bg-code: #1c1f24;
    --bg-inline-code: #2a2d33;
    --border: #2a2d33;
    --border-strong: #3a3d44;
    --accent: #6ea8ff;
    --accent-soft-bg: #1f2a44;
    --chip-id-bg: #3a2f14;
    --chip-id-fg: #f4d68a;
    --chip-label-fg: #b5cdff;
    --kid-active-bg: #2a2414;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
code, pre, .chip code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--fg);
}
header nav a { margin-left: 18px; color: var(--fg-muted); font-size: 0.95rem; }

main.container {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  padding-top: 32px;
  padding-bottom: 64px;
  align-items: start;
}
main.container.home { display: block; }
.content { min-width: 0; }
.content.home, main.home > .content { max-width: 900px; margin: 0 auto; }

.sidebar {
  position: sticky;
  top: 24px;
  align-self: start;
  font-size: 0.9rem;
  border-right: 1px solid var(--border);
  padding-right: 16px;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
}
.sidebar h2 { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--fg-subtle); margin: 0 0 8px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar .cat { margin-bottom: 4px; }
.sidebar .cat > a { color: var(--fg); display: block; padding: 4px 8px; border-radius: 4px; }
.sidebar .cat.active > a { background: var(--accent-soft-bg); color: var(--accent); font-weight: 500; }
.sidebar .kids { margin: 4px 0 8px 12px; border-left: 2px solid var(--border); padding-left: 8px; }
.sidebar .kids li { padding: 3px 6px; border-radius: 4px; }
.sidebar .kids li.active { background: var(--kid-active-bg); }
.sidebar .kids a { color: var(--fg-muted); font-size: 0.85rem; }

h1 { font-size: 1.85rem; margin: 0 0 8px; line-height: 1.25; }
h2 { font-size: 1.3rem; margin: 32px 0 12px; }
h3 { font-size: 1.05rem; margin: 24px 0 8px; }

.breadcrumb {
  font-size: 0.85rem;
  color: var(--fg-subtle);
  margin-bottom: 8px;
}
.breadcrumb a { color: var(--fg-subtle); }
.breadcrumb span { color: var(--fg); }

.chips { margin: 8px 0 24px; }
.chip {
  display: inline-block;
  font-size: 0.8rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg-inline-code);
  color: var(--fg-muted);
  margin-right: 6px;
}
.chip.id { background: var(--chip-id-bg); color: var(--chip-id-fg); }
.chip.label { background: var(--accent-soft-bg); color: var(--chip-label-fg); }

p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 24px; }
li { margin: 4px 0; }
blockquote {
  margin: 0 0 16px;
  padding: 8px 16px;
  border-left: 3px solid var(--border-strong);
  color: var(--fg-muted);
  background: var(--bg-elevated);
}

pre {
  background: var(--bg-code);
  padding: 14px 18px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.5;
  margin: 0 0 16px;
}
:not(pre) > code {
  background: var(--bg-inline-code);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}

.prevnext {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  gap: 16px;
}
.prevnext a { color: var(--fg-muted); font-size: 0.9rem; }
.prevnext .next { margin-left: auto; }

/* Homepage grids */
.intro { max-width: 760px; margin-bottom: 48px; }
.intro h1 { font-size: 2.2rem; }
.lede { color: var(--fg-muted); margin-bottom: 24px; }

.categories-grid .grid {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.categories-grid .grid li {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  position: relative;
}
.categories-grid .grid li:hover { border-color: var(--accent); }
.categories-grid .grid h3 { margin: 0 0 6px; font-size: 1rem; color: var(--accent); }
.categories-grid .grid a { color: inherit; }
.categories-grid .grid h3 a::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
}
.categories-grid .grid p { color: var(--fg-muted); font-size: 0.9rem; flex: 1; margin: 0 0 8px; }
.categories-grid .card-body {
  color: var(--fg-muted);
  font-size: 0.9rem;
  flex: 1;
  margin: 0 0 8px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  position: relative;
  z-index: 2;
}
.categories-grid .card-body p { margin: 0 0 4px; color: inherit; font-size: inherit; }
.categories-grid .card-body p:last-child { margin-bottom: 0; }
.categories-grid .grid .count { color: var(--fg-subtle); font-size: 0.8rem; }

.memories-list { margin-top: 48px; }
.memories-list .memory-keys {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 4px 12px;
}
.memories-list .memory-keys li { margin: 0; }

.memory { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.memory h2 { font-size: 1rem; margin: 0 0 8px; }
.memory h2 a { color: var(--accent); }
.memory p { margin: 0; }

footer {
  border-top: 1px solid var(--border);
  margin-top: 64px;
  padding: 24px 0;
  background: var(--bg-elevated);
  font-size: 0.85rem;
  color: var(--fg-subtle);
}
footer a { color: var(--fg-muted); }

@media (max-width: 740px) {
  main.container { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; border-right: 0; padding-right: 0; border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 24px; }
}