body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}.container{max-width:1200px;margin:0 auto;padding:0 20px}.btn{display:inline-block;padding:12px 24px;border-radius:8px;text-decoration:none;font-weight:600;transition:all .3s ease}.btn-primary{background:#3b82f6;color:#fff}.btn-primary:hover{background:#2563eb;transform:translateY(-2px)}