body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #fff;
}

header {
  padding: 10px;
  background: #020617;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

main {
  display: flex;
  height: calc(100vh - 60px);
}

.player-section {
  flex: 2;
  padding: 10px;
}

video {
  width: 100%;
  height: 100%;
  background: black;
}

.channel-section {
  flex: 1;
  overflow-y: auto;
  background: #020617;
}

#channelList {
  list-style: none;
  padding: 0;
  margin: 0;
}

#channelList li {
  padding: 10px;
  cursor: pointer;
  border-bottom: 1px solid #1e293b;
}

#channelList li:hover {
  background: #1e293b;
}

select {
  padding: 5px;
}