:root {
  --accent: #4f6df5; --bg: #f4f5fa; --surface: #fff; --text: #1b2132; --muted: #5d6478; --line: #d9dce8;
  color-scheme: light;
  font-family: 'Nunito Variable', ui-rounded, 'SF Pro Rounded', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e1117; --surface: #171b24; --text: #e8ebf3; --muted: #9aa1b4; --line: #2a3040; --accent: #7b93ff; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.65; -webkit-font-smoothing: antialiased; }
main { max-width: 680px; margin: 0 auto; padding: 24px 16px 64px; }
nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
nav a.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--text); text-decoration: none; font-size: 1.1rem; }
nav a.brand img { width: 32px; height: 32px; }
a { color: var(--accent); font-weight: 700; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.35rem; margin: 36px 0 8px; }
h3 { font-size: 1.05rem; margin: 22px 0 4px; }
p, ul, ol { margin: 0 0 12px; }
.lead { font-size: 1.1rem; color: var(--muted); }
.cta { display: inline-block; background: var(--accent); color: #fff; padding: 12px 22px; border-radius: 14px; text-decoration: none; margin: 8px 0 4px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px; margin: 16px 0; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; text-align: center; }