:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: #071d22;
  color: #e9f8f5;
}

body {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}

header, footer { color: #acd0c9; }
h1, h2 { line-height: 1.2; color: #ffffff; }
h1 { margin-bottom: 8px; }
h2 { margin-top: 36px; }
a { color: #69e0c7; }
.card {
  margin: 24px 0;
  padding: 20px;
  border: 1px solid #28515a;
  border-radius: 16px;
  background: #0b282f;
}
.muted { color: #acd0c9; }
footer { margin-top: 52px; border-top: 1px solid #28515a; padding-top: 20px; }
@media (prefers-color-scheme: light) {
  :root { background: #f4fbf9; color: #17363b; }
  h1, h2 { color: #09282e; }
  a { color: #007d68; }
  .card { background: #ffffff; border-color: #c8dfda; }
  header, footer, .muted { color: #4d6b70; }
  footer { border-color: #c8dfda; }
}