nav .header{
    background-color: #106ebe;
    width: 100%;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header a{
    text-decoration: none;
    color: white;
}

nav .header{
    display: flex;
    align-items: center;
    padding: 10px;
}

.fa-home{
    font-size: 20px;
}

.btn-primary{
    background-color: #106ebe;
}

.btn-login{
    padding: 5px;
}

.spinner-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: hidden;
}
.spinner {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}