/* Personal knowledge base — single shared stylesheet.
   Theme-aware (light/dark via prefers-color-scheme). No external fonts. */

:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5c6672;
  --accent: #2563eb;
  --border: #e5e7eb;
  --card: #f7f8fa;
  --maxw: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8eaed;
    --muted: #9aa4b2;
    --accent: #6ea8fe;
    --border: #262b33;
    --card: #171a21;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 0 1.25rem;
}

/* ---- Top navigation ---- */
.site-nav {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: baseline;
  padding: 1.5rem 0 1rem;
  border-bottom: 1px solid var(--border);
}
.site-nav .brand {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--fg);
  margin-right: auto;
}
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }

/* ---- Main content ---- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 0 4rem;
}
main h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.75rem; }
main h2 { font-size: 1.35rem; margin: 2rem 0 0.5rem; }
main h3 { font-size: 1.1rem; margin: 1.5rem 0 0.35rem; }
main p { margin: 0.75rem 0; }
main a { color: var(--accent); }
main ul, main ol { padding-left: 1.4rem; }
main li { margin: 0.3rem 0; }
main hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
main code {
  background: var(--card);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}
main blockquote {
  margin: 1rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}
.error { color: #dc2626; }

/* ---- Homepage lead + link cards ---- */
.lead { color: var(--muted); font-size: 1.1rem; }

.cards {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}
.cards a {
  display: block;
  padding: 1.1rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--fg);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.cards a:hover { border-color: var(--accent); transform: translateY(-2px); }
.cards strong { display: block; font-size: 1.05rem; margin-bottom: 0.25rem; }
.cards span { color: var(--muted); font-size: 0.9rem; }

/* ---- Footer ---- */
.site-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer a { color: var(--muted); }