html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    color-scheme: light dark;
    background-color: #FFFFFF;
}

@media (prefers-color-scheme: dark) {
    html, body {
        background-color: #121212;
    }
}

#loader {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(128, 128, 128, 0.3);
    border-top-color: #888;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}