body {
    font-family: Arial, sans-serif;
    background: linear-gradient(90deg, rgba(0,0,0,1) 0%, rgba(40,0,70,1) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.login-container {
    background-color: #fff;
    padding: 40px 30px;
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-container h2 {
    margin-bottom: 20px;
    color: #333;
}

input[type="text"],
input[type="mail"],
input[type="tel"],
input[type="password"] {
    width: 100%;
    padding: 12px 15px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
    box-sizing: border-box;
}

input[type="submit"] {
    width: 100%;
    padding: 12px;
    background-color: #28a745;
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 18px;
    cursor: pointer;
    margin-top: 20px;
}

input[type="submit"]:hover {
    background-color: #218838;
}

.error {
    color: red;
    margin-top: 10px;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 12px 15px;
    border: 1px solid #f5c6cb;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 15px;
}