:root { --bg: #fbfaf7; --text: #1d1d1f; --muted: #5f6368; --line: #e3e1dc; --accent: #1f8a4c; --card: #ffffff; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #141414; --text: #f2f2f2; --muted: #a5a5a5; --line: #2c2c2c; --accent: #4cc47c; --card: #1d1d1d; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main, header, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; padding-bottom: 8px; }
header a { color: var(--text); text-decoration: none; font-weight: 600; }
nav a { color: var(--muted); font-weight: 400; margin-left: 16px; font-size: 15px; }
h1 { font-size: 40px; line-height: 1.15; margin: 48px 0 12px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 40px 0 8px; }
p, li { color: var(--text); }
.lead { font-size: 20px; color: var(--muted); }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
.card { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 20px 22px; margin: 24px 0; text-decoration: none; color: var(--text); }
.card h2 { margin: 0 0 4px; }
.card p { margin: 0; color: var(--muted); }
footer { border-top: 1px solid var(--line); margin-top: 64px; padding-top: 20px; padding-bottom: 40px; }
footer a { color: var(--muted); margin-right: 16px; font-size: 15px; }