:root {
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-display: "Space Grotesk", "Inter", sans-serif;
}
html.light {
  --color-bg: #f7fbff;
  --color-page: #f7fbff;
  --color-surface: rgba(255,255,255,0.8);
  --color-surface-alt: #e8f1ff;
  --color-card: rgba(255,255,255,0.8);
  --color-text: #112036;
  --color-heading: #112036;
  --color-muted: #4d617d;
  --color-link: #1d4ed8;
  --color-accent: #14b8a6;
  --color-border: #c8d7f2;
}
html.dark {
  --color-bg: #020617;
  --color-page: #0b1220;
  --color-surface: rgba(8,15,29,0.92);
  --color-surface-alt: #10253f;
  --color-card: rgba(8,15,29,0.96);
  --color-text: #dbeafe;
  --color-heading: #ecfeff;
  --color-muted: #94a3b8;
  --color-link: #22d3ee;
  --color-accent: #2dd4bf;
  --color-border: rgba(125,211,252,0.18);
}
* { box-sizing: border-box; }
html { background: var(--color-page); color-scheme: light dark; }
body {
  margin: 0;
  font-family: var(--font-body, "Inter", sans-serif);
  background: linear-gradient(180deg, var(--color-page), var(--color-bg));
  color: var(--color-text);
}
a { color: var(--color-link); text-decoration: none; }
.page-shell { min-height: 100vh; }
.site-header, .site-footer {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-footer { border-top: 1px solid var(--color-border); border-bottom: 0; margin-top: 3rem; }
.inner {
  width: min(1120px, calc(100vw - 2rem));
  margin: 0 auto;
}
.site-header .inner,
.site-footer .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}
.brand-kicker, .eyebrow { color: var(--color-accent); text-transform: uppercase; letter-spacing: .24em; font-size: .75rem; font-weight: 700; }
.brand-title, .article-title, .section-title { color: var(--color-heading); font-family: var(--font-display, var(--font-body)); letter-spacing: -.03em; }
.brand-title { font-size: 1.125rem; margin: .25rem 0 0; }
.nav-links { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.nav-links a { color: var(--color-text); font-weight: 600; }
.nav-links a[data-route-active="true"] {
  background: var(--color-link);
  color: #ecfeff;
  border-radius: 999px;
  padding: .55rem .9rem;
}
.footer-nav a[data-route-active="true"] {
  color: var(--color-heading);
  font-weight: 700;
}
.mode-toggle, .mode-auto, .tag-pill, .cta-pill {
  border: 1px solid var(--color-border);
  background: var(--color-card);
  color: var(--color-text);
  border-radius: 999px;
  padding: .55rem .9rem;
  font: inherit;
}
.cta-pill { background: var(--color-link); color: #ecfeff; border-color: transparent; }
.content-wrap { width: min(1120px, calc(100vw - 2rem)); margin: 0 auto; padding: 2rem 0 3rem; }
.content-grid { display: grid; gap: 1.5rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 980px) { .content-grid.with-sidebar { grid-template-columns: minmax(0, 1fr) 280px; } }
.surface {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1.5rem;
  box-shadow: 0 18px 50px rgba(2, 8, 23, 0.08);
}
.article-surface { padding: 2rem; }
.article-subtitle { color: var(--color-text); font-size: 1.125rem; }
.article-meta, .muted { color: var(--color-muted); }
.theme-prose { margin-top: 2rem; color: var(--color-text); line-height: 1.85; }
.theme-prose h1, .theme-prose h2, .theme-prose h3, .theme-prose h4 { color: var(--color-heading); font-family: var(--font-display, var(--font-body)); }
.theme-prose p, .theme-prose li, .theme-prose td { color: var(--color-text); }
.theme-prose ul { padding-left: 1.25rem; }
.theme-prose blockquote {
  color: var(--color-heading);
  border-left: 3px solid var(--color-border);
  padding-left: 1rem;
  margin-left: 0;
}
.theme-prose code, .theme-prose pre {
  background: var(--color-card);
  color: var(--color-heading);
  border-radius: .75rem;
}
.theme-prose pre { padding: 1rem; overflow: auto; }
.tag-row, .tag-cloud { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.article-related {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 1.25rem;
  padding: 1.5rem;
  margin-top: 2rem;
}
.related-grid, .post-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.related-card, .post-card, .sidebar-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1rem;
}
.surface-panel {
  background: color-mix(in srgb, var(--color-card) 86%, var(--color-surface-alt) 14%);
  border: 1px solid color-mix(in srgb, var(--color-border) 82%, transparent 18%);
  border-radius: 1.25rem;
  padding: 1rem;
}
.surface-code {
  display: block;
  background: color-mix(in srgb, var(--color-surface-alt) 58%, var(--color-bg) 42%);
  border: 1px solid color-mix(in srgb, var(--color-border) 76%, transparent 24%);
  color: var(--color-heading);
  border-radius: 1rem;
  padding: .9rem;
  overflow: auto;
}
.catalog-grid {
  display: grid;
  gap: 1rem;
}
.catalog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1.5rem;
  padding: 1.5rem;
}
.catalog-meta {
  display: inline-flex;
  align-items: center;
  background: color-mix(in srgb, var(--color-card) 82%, var(--color-surface-alt) 18%);
  border: 1px solid var(--color-border);
  color: var(--color-heading);
  border-radius: 999px;
  padding: .75rem 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .875rem;
}
.related-card-title, .post-card-title { color: var(--color-heading); font-weight: 700; }
.post-card-desc, .related-card-body { color: var(--color-text); }
.sidebar-stack { display: grid; gap: 1rem; }
.footer-copy { color: var(--color-muted); font-size: .95rem; }