body {
    background-color: #f0f0f0;
    color: #333;
    font-family: Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    background-color: #1e1e1e;
    color: #cfcfcf;
}

.card {
    border-radius: 15px;
}

.card-header {
    border-radius: 15px 15px 0 0;
}

.card-body {
    padding: 30px;
    border-radius: 0 0 15px 15px;
}

.form-control {
    border-radius: 30px;
    padding: 10px 20px;
    transition: background-color 0.3s, color 0.3s;
}

.form-control:focus {
    box-shadow: 0 0 10px rgba(0, 123, 255, 0.5);
}

textarea.form-control {
    resize: none;
}

.btn {
    border-radius: 30px;
    padding: 10px 20px;
}

.btn-block {
    margin-top: 10px;
}

#toggle-theme {
    border-radius: 50%;
}

body.dark-mode .card {
    background-color: #2a2a2a;
}

body.dark-mode .form-control {
    background-color: #333;
    color: #cfcfcf;
    border-color: #444;
}

body.dark-mode .form-control:focus {
    box-shadow: 0 0 10px rgba(0, 123, 255, 0.8);
}

body.dark-mode .btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

body.dark-mode .btn-secondary {
    background-color: #6c757d;
    border-color: #6c757d;
}

body.dark-mode .btn-danger {
    background-color: #dc3545;
    border-color: #dc3545;
}