:root {
  color-scheme: dark;
  font-family: "Segoe UI", Arial, sans-serif;
  background: #0d1117;
  color: #e6edf3;
}
* { box-sizing: border-box; }
body { margin: 0; line-height: 1.65; }
header, footer, main { width: min(760px, calc(100% - 32px)); margin: 0 auto; }
header { padding: 24px 0 12px; }
main { padding: 28px 0 48px; }
h1 { font-size: 2rem; margin: 0 0 20px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; color: #75e5cf; }
p { color: #c9d1d9; }
a { color: #63b0ff; }
footer { border-top: 1px solid #30363d; padding: 20px 0 36px; }