* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, sans-serif; line-height: 1.6; padding: 20px; max-width: 1200px; margin: 0 auto; }
header { text-align: center; padding: 60px 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border-radius: 10px; margin-bottom: 40px; }
h1 { font-size: 2.5rem; margin-bottom: 10px; }
main { padding: 20px; }
section { margin-bottom: 40px; }
footer { text-align: center; padding: 20px; color: #666; border-top: 1px solid #eee; margin-top: 60px; }