:root {
  --bg: #fbfbf9;
  --fg: #24242a;
  --muted: #6d6d78;
  --accent: #3b5bdb;
  --line: #e4e4de;
  --maxw: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --fg: #e6e6e3;
    --muted: #9a9aa4;
    --accent: #8ba4f9;
    --line: #2c2c31;
  }
}

* { box-sizing: border-box; }

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.75rem 0 1.25rem;
  border-bottom: 1px solid var(--line);
}

.logo {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.1rem;
  font-size: 0.94rem;
}

nav a:hover { color: var(--fg); }

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

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

.notes {
  list-style: none;
  margin: 0;
  padding: 0;
}

.notes li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
}

.notes a { text-decoration: none; }
.notes a:hover { text-decoration: underline; }

.date {
  flex: none;
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

footer p { margin: 0; }

.notfound {
  padding: 4rem 0;
  text-align: center;
}

.notfound .code {
  display: block;
  font-size: 3rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: -0.03em;
}