body { font-family: system-ui, sans-serif; margin: 0; padding: 2rem; background: #f6f8fb; color: #1a1a1a; }
main { max-width: 720px; margin: 0 auto; background: #fff; padding: 2rem; border-radius: 12px; box-shadow: 0 2px 12px rgba(0,0,0,.06); }
h1 { margin-top: 0; }