:root {
  --bg: #fbf8ff; --fg: #1b1b21; --muted: #5d5c71; --brand: #4338ca; --card: #ffffff; --line: #e4e1f5;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #131318; --fg: #e5e1e9; --muted: #aaa8be; --brand: #c3c0ff; --card: #1f1f26; --line: #34333f; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 32px; }
header img { width: 52px; height: 52px; border-radius: 14px; }
header a { color: inherit; text-decoration: none; font-weight: 800; letter-spacing: .3em; font-size: 22px; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; letter-spacing: normal; font-weight: 500; }
nav a:hover, a { color: var(--brand); }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
.lead { font-size: 19px; color: var(--muted); margin-top: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 20px 24px; margin: 16px 0; }
small, .muted { color: var(--muted); }
footer { margin-top: 48px; border-top: 1px solid var(--line); padding-top: 16px; font-size: 14px; color: var(--muted); }