:root {
  --bg: #0f1115;
  --fg: #e6e8ec;
  --muted: #9aa0aa;
  --accent: #4f8cff;
  --card: #171a21;
  --border: #262b34;
  --max: 640px;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 20px 64px;
}
h1 { font-size: 1.7rem; margin: 0 0 .5em; letter-spacing: -.01em; }
h2 { font-size: 1.2rem; margin: 1.6em 0 .5em; }
p { color: var(--muted); margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.nav {
  display: flex;
  gap: 18px;
  margin-bottom: 32px;
  font-size: .95rem;
}
.nav a { color: var(--muted); }
.nav a:hover { color: var(--fg); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  margin: 24px 0;
}
code {
  background: #0b0d10;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: .1em .35em;
  font-size: .9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px 40px;
  color: var(--muted);
  font-size: .85rem;
}
.center { text-align: center; }
.big { font-size: 3rem; font-weight: 600; margin: 24px 0 8px; }