:root {
  --bg: #f6f7f5;
  --surface: #ffffff;
  --text: #151815;
  --muted: #5a615a;
  --line: #dfe3de;
  --accent: #2f7a3a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #090b09;
    --surface: #121512;
    --text: #eef1ed;
    --muted: #a3aba2;
    --line: #262b26;
    --accent: #8fd49a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header { margin-bottom: 32px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand img { width: 44px; height: 44px; border-radius: 22.37%; }
.brand span { font-weight: 700; font-size: 20px; letter-spacing: 0.2px; }
nav { margin-top: 16px; display: flex; gap: 16px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  margin: 16px 0;
}
.card h2, .card h3 { margin-top: 0; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }