:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

body {
  margin: 0;
  background: #f7f6f2;
  color: #1c2430;
}

main {
  box-sizing: border-box;
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 48px 24px 72px;
}

h1, h2 { line-height: 1.2; }
h1 { margin-bottom: 8px; }
h2 { margin-top: 32px; }
a { color: #225ea8; }
nav { display: flex; gap: 20px; flex-wrap: wrap; }
.effective { color: #596273; }

@media (prefers-color-scheme: dark) {
  body { background: #12161d; color: #edf0f5; }
  a { color: #83b9ff; }
  .effective { color: #aeb7c5; }
}