:root {
  --bg: #fbfaf7;
  --text: #1f2421;
  --muted: #5f6a64;
  --accent: #2f5d50;
  --line: #e3e0d8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161a18;
    --text: #e8ebe9;
    --muted: #9aa59f;
    --accent: #7fb7a5;
    --line: #2c3330;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 640px; margin: 0 auto; padding: 32px 20px 48px; }
header { margin-bottom: 56px; }
.mark { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; color: var(--text); text-decoration: none; }
.logo { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 7px; background: var(--accent); color: var(--bg); font-size: 16px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 16px; letter-spacing: -0.01em; }
h2 { font-size: 19px; margin: 36px 0 8px; }
.lead { font-size: 19px; color: var(--muted); }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
ul { padding-left: 20px; }
li { margin-bottom: 10px; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer p { margin: 4px 0; }
@media (max-width: 480px) { h1 { font-size: 28px; } .lead { font-size: 17px; } }