body {
    font-family: Arial, sans-serif;
    background-color: #f4f7f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

form {
    background-color: white;
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 450px;
}

h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #333;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 1rem;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    border-color: #007bff;
    outline: none;
}

button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

button[type="submit"]:hover {
    background-color: #0056b3;
}

.error {
    color: red;
    text-align: center;
    margin-top: 1rem;
}
.back-btn {
            display: inline-block;
            margin-top: 10px;
            padding: 8px 14px;
            background: #6c757d;
            color: white;
            border-radius: 5px;
            text-decoration: none;
        }
        .back-btn:hover {
            background: #5a6268;
        }