body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: #fff;
    color: #000;
    transition: background 0.3s, color 0.3s;
}
.dark-mode {
    background: #121212;
    color: #fff;
}
header {
    padding: 10px;
}
#search, #groupFilter {
    padding: 8px;
    margin: 10px;
}
main {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}
.channel-card {
    width: 200px;
    margin: 10px;
    padding: 10px;
    background: #f4f4f4;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s;
}
.channel-card:hover {
    transform: scale(1.05);
}
.channel-card img {
    width: 100%;
    height: 120px;
}
.player-container {
    width: 100%;
    height: 100vh;
}