body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background: #fff; }
.container { max-width: 800px; margin: auto; padding: 20px; }
header { background: #f8f9fa; padding: 20px 0; border-bottom: 1px solid #eee; }
.logo { font-weight: bold; font-size: 1.5rem; color: #007bff; }
h1 { color: #2c3e50; }
.subtitle { font-size: 1.2rem; color: #666; margin-bottom: 40px; }
.card { background: #f9f9f9; padding: 20px; margin: 20px 0; border-radius: 8px; }
.btn { display: inline-block; background: #007bff; color: #fff; padding: 15px 30px; text-decoration: none; border-radius: 5px; font-weight: bold; }
footer { margin-top: 50px; padding: 20px; text-align: center; font-size: 0.8rem; border-top: 1px solid #eee; }