.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.form-group {
    margin-bottom: 15px;
}
#countdown {
    font-weight: bold;
    color: #dc3545;
}
.loader {
    display: none;
    margin-left: 10px;
    border: 2px solid #f3f3f3;
    border-radius: 50%;
    border-top: 2px solid #3498db;
    width: 16px;
    height: 16px;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}