body {
            font-family: Helvetica;
            display: flex;
            flex-direction: column;
            align-items: center;
            margin: 0;
            padding: 20px;
            background-image: url("https://watermark.lovepik.com/photo/40186/1536.jpg_wh1200.jpg");
            background-position: center;
            background-repeat: no-repeat;
            background-size: cover;
            height: 100%;
}

        h1 {
            color: #018749;
            font-size: 25px;
            margin: 5px 0;
            text-align: center;
            position: absolute;
            top: 2px;
        }
        h2 {
            color: #FFFFFF;
            font-size: 15px;
            margin: 2px 0;
            text-align: center;
            position: relative;
            top: 20px;
        }

        #video-container {
            width: 640px;
            height: 480px;
            margin-top: 20px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
            top: 30px;
        }

        #video-player {
            width: 100%;
            height: 100%;
            border-radius: 12px;
            outline: none;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
        }

        @media (max-width: 720px) and (orientation: portrait) {
            #video-container {
                width: 90%;
                height: calc(90vw * 9 / 16);
                box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
                border: 1px solid #A4A4A4;
            }

            #video-player {
                box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
            }
        }

        #channel-selector {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 10px;
            margin-top: 20px;
            width: 80%;
            max-width: 800px;
        }

        @media (orientation: portrait) {
            #channel-selector {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .tile {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: relative;
            width: 100%;
            padding-top: 100%;
            cursor: pointer;
            border: 2px solid #A4A4A4;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            background-color: #808080;
            overflow: hidden;
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }

        .tile img {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 90%;
            height: 90%;
            object-fit: contain;
        }

        .tile:hover {
            box-shadow: 0 6px 10px rgba(0, 0, 0, 0.2);
            transform: scale(1.05);
            border-color: #018749;
        }

        .tile:hover .play-button {
            display: flex;
        }

        .tile.active {
            background-color: #000;
            border-color: #018749;
        }

        .tile span {
            position: absolute;
            bottom: 10px;
            width: 100%;
            font-size: 10px;
            font-weight: bold;
            color: #fff;
            text-align: center;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .tile:hover span {
            opacity: 1;
        }

        .navigation-buttons {
            display: flex;
            margin-top: 20px;
            gap: 15px;
        }

        .navigation-button {
            background-color: #018749;
            color: white;
            padding: 10px 20px;
            border-radius: 30px;
            font-size: 14px;
            cursor: pointer;
            border: none;
            transition: background-color 0.3s ease;
        }

        .navigation-button:hover {
            background-color: #014c2d;
        }