body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; margin: 0; color: #121212; background: #f7f7f7; }
header, footer { background: #fff; padding: 12px 18px; border-bottom: 1px solid #e3e3e3; }
main { max-width: 900px; margin: 24px auto; background: #fff; padding: 20px; border-radius: 8px; }
a { color: #0058d2; }