body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: black;
}

/* header */
.nav-header {
    background-color: rgba(20, 20, 20, 0.9);
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
    align-items: center;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
    white-space: nowrap;
}

.nav-links a:hover {
    color: rgba(255, 255, 255, 1);
}

/* videos */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* When screen is less than 900px, show 2 videos per row */
@media (max-width: 900px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* When screen is less than 600px, show 1 video per row */
@media (max-width: 600px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
}