:root {
  color-scheme: light dark;
  --accent: #3873eb;
  --accent2: #73c7d9;
  --text: #1a1a1a;
  --text-dim: rgba(0,0,0,0.65);
  --bg: #f5f7fc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8e8e8;
    --text-dim: rgba(255,255,255,0.7);
    --bg: #0f1118;
  }
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  line-height: 1.55;
  margin: 0;
  padding: 0;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
}
header.site {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(128,128,128,0.25);
  background: linear-gradient(135deg, rgba(56,115,235,0.12), rgba(115,199,217,0.08));
}
header.site .inner {
  max-width: 42rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
header.site a.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}
header.site nav a {
  color: var(--accent);
  text-decoration: none;
  margin-left: 1rem;
  font-size: 0.95rem;
}
header.site nav a:hover { text-decoration: underline; }
main {
  padding: 1.25rem 1.25rem 3rem;
  max-width: 42rem;
  margin: 0 auto;
}
h1 { font-size: 1.5rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }
h3 { font-size: 1rem; margin: 1.1rem 0 0.4rem; opacity: 0.95; }
p, li { margin: 0.5rem 0; }
ul { padding-left: 1.25rem; }
.muted { font-size: 0.88rem; color: var(--text-dim); }
footer {
  max-width: 42rem;
  margin: 2rem auto;
  padding: 1rem 1.25rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(128,128,128,0.25);
}