*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background-color:#f5f5f5}#app{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:20px}.card{background-color:#fff;border-radius:8px;box-shadow:0 2px 4px #0000001a;padding:20px;margin:20px 0}button{background-color:#4caf50;color:#fff;border:none;padding:10px 20px;border-radius:4px;cursor:pointer;font-size:16px}button:hover{background-color:#45a049}input{width:100%;padding:10px;margin:10px 0;border:1px solid #ddd;border-radius:4px}.form-group{margin:15px 0}label{display:block;margin-bottom:5px;font-weight:700}.error{color:red;font-size:14px;margin-top:5px}.success{color:green;font-size:14px;margin-top:5px}nav{background-color:#333;color:#fff;padding:10px 20px}nav ul{list-style:none;display:flex;gap:20px}nav a{color:#fff;text-decoration:none}nav a:hover{text-decoration:underline}