body {
    font-family: 'Roboto', sans-serif; /* Font kekinian */
    background: #ffffff; /* Dominan putih */
    color: #003366; /* Teks biru navy */
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

header {
    text-align: center;
    padding: 20px;
    background: #f0f8ff; /* Putih dengan aksen biru muda */
    border-bottom: 3px solid #00bfff; /* Aksen cyan */
    box-shadow: 0 2px 10px rgba(0, 191, 255, 0.3); /* Efek glow cyan */
}

h1 {
    font-size: 2.5em;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #003366;
}

.grid-controls {
    margin-top: 10px;
}

.grid-controls button {
    background: #00bfff; /* Cyan */
    color: white;
    border: none;
    padding: 10px 20px;
    margin: 0 5px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}

.grid-controls button:hover {
    background: #003366; /* Navy on hover */
}

.command-center {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    padding: 20px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* Default 4x4 */
    gap: 15px;
    max-width: 1400px;
    width: 100%;
}

.video-container {
    background: #ffffff;
    border: 2px solid #00bfff; /* Cyan border */
    border-radius: 10px;
    padding: 10px;
    box-shadow: 0 4px 15px rgba(0, 191, 255, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
}

.video-container:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 191, 255, 0.4);
}

.video-container.empty {
    background: #f0f8ff; /* Placeholder untuk slot kosong */
    border: 1px dashed #00bfff;
    visibility: hidden; /* Sembunyikan secara default, tampilkan di 4x4 */
}

video {
    width: 100%;
    height: 200px;
    border-radius: 5px;
}

p {
    text-align: center;
    margin-top: 5px;
    font-size: 0.9em;
    color: #003366;
}

footer {
    text-align: center;
    padding: 10px;
    background: #f0f8ff;
    border-top: 3px solid #00bfff;
}

/* Responsif untuk mobile */
@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr); /* Default ke 2x2 di mobile */
    }
    .grid-controls button {
        padding: 8px 15px;
        font-size: 0.9em;
    }
}