:root {
  --canvas: #0b0e14;
  --surface: #141925;
  --border: #2a3242;
  --ink: #e8ecf4;
  --ink-muted: #9aa4b8;
  --primary: #3df2c2;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 32px 0 8px; }
ul { padding-left: 20px; }
.muted { color: var(--ink-muted); font-size: 14px; }
a { color: var(--primary); }
nav { margin-bottom: 24px; font-size: 14px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
}