.video-container {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* Rasio aspek 16:9 */
    height: 0;
    overflow: hidden;
    background: #000;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}