:root { --bg: #ffffff; --text: #1f2933; --accent: #2563eb; --muted: #f3f4f6; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #111827; --text: #e5e7eb; --accent: #60a5fa; --muted: #1f2937; }
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text); background: var(--bg); line-height: 1.6; }
.hero, main, footer { max-width: 760px; margin: 0 auto; padding: 48px 16px; }
.hero { padding-top: 96px; }
h1 { font-size: 2.5rem; margin: 0 0 16px; }
.lead { font-size: 1.2rem; margin: 0 0 32px; }
.button { display: inline-block; padding: 12px 24px; background: var(--accent); color: #fff; border-radius: 8px; text-decoration: none; font-weight: 600; }
.button:hover { opacity: .9; }
section { background: var(--muted); border-radius: 12px; padding: 24px; }
footer { font-size: .9rem; opacity: .7; }