body {
    background-color: #121212;
    color: #e0e0e0;
}

.navbar,
.sidebar {
    background-color: #1f1f1f;
}

.nav-link,
.navbar-brand {
    color: #ffffff;
}

.nav-link:hover {
    color: #0d6efd;
}

.content {
    margin-left: 220px;
    padding: 2rem;
}

.sidebar {
    width: 200px;
    position: fixed;
    top: 56px;
    bottom: 0;
    left: 0;
    padding: 1rem;
    overflow-y: auto;
}
.spinner {
    width: 80px;
    height: 80px;
    border: 8px solid #333;
    border-top: 8px solid #09f;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}