:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #0a0f14;
  --muted: #3d4853;
  --signal: #0b6178;
  --line: #c5ced7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1116;
    --fg: #f4f7fa;
    --muted: #c5ced6;
    --signal: #7fd4e8;
    --line: #2a3642;
  }
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  font-style: normal;
  line-height: 1.55;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

h1 {
  margin: 0 0 1rem;
  font-size: 1.875rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h2 {
  margin: 2rem 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 650;
}

p, li { font-size: 1rem; }

ul { padding-left: 1.2rem; }

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

.mark {
  margin: 0 0 1.5rem;
  color: var(--signal);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.meta { color: var(--muted); }

.mono {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.8125rem;
  overflow-wrap: anywhere;
}

.links { display: flex; gap: 1.25rem; margin-top: 2rem; }