:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --card: #fff;
  --text: #1b2330;
  --muted: #5f6b7a;
  --line: #dde2e8;
  --accent: #1f5fbf;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161d;
    --card: #1a212b;
    --text: #e8edf3;
    --muted: #9aa7b5;
    --line: #2c3644;
    --accent: #6ea8fe;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font:
    17px / 1.5 system-ui,
    sans-serif;
  background: var(--bg);
  color: var(--text);
}
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}
h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 0 0 12px;
}
h2 {
  font-size: 19px;
  margin: 28px 0 6px;
}
a {
  color: var(--accent);
}
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}
.note {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  color: var(--muted);
}
footer {
  margin-top: 32px;
  color: var(--muted);
  font-size: 14px;
}