body{font-family:Arial,sans-serif;margin:0;padding:0;background-color:#f5f5f5}.container{max-width:1200px;margin:0 auto;padding:20px}.header{background-color:#333;color:#fff;padding:1rem;text-align:center}.card{background:#fff;border-radius:8px;padding:20px;margin:20px 0;box-shadow:0 2px 4px rgba(0,0,0,.1)}.button{background-color:#007bff;color:#fff;border:none;padding:10px 20px;border-radius:4px;cursor:pointer}.button:hover{background-color:#0056b3}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:700}.form-group input,.form-group textarea{width:100%;padding:8px;border:1px solid #ddd;border-radius:4px;box-sizing:border-box}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));grid-gap:20px;gap:20px}.error{color:#dc3545;background-color:#f8d7da;border:1px solid #f5c6cb;border-radius:4px}.error,.success{padding:10px;margin:10px 0}.success{color:#155724;background-color:#d4edda;border:1px solid #c3e6cb;border-radius:4px}