* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, Arial, sans-serif; background:#0f0f14; color:#eee; }
.app { display:flex; flex-direction:column; height:100vh; }
header { display:flex; align-items:center; justify-content:space-between; padding:12px 16px; background:#181822; }
header h1 { font-size:18px; }
#search { padding:8px 12px; border-radius:6px; border:1px solid #333; background:#0f0f14; color:#eee; width:220px; }
.main { display:flex; flex:1; overflow:hidden; }
#channel-list { width:300px; overflow-y:auto; background:#14141c; border-right:1px solid #222; }
.group-title { padding:8px 12px; font-weight:bold; background:#1c1c28; color:#8ab4f8; position:sticky; top:0; }
.channel-item { display:flex; align-items:center; gap:8px; padding:8px 12px; cursor:pointer; border-bottom:1px solid #1c1c28; }
.channel-item:hover, .channel-item.active { background:#25253a; }
.channel-item img { width:32px; height:32px; object-fit:contain; background:#fff; border-radius:4px; }
.channel-item span { font-size:13px; }
.player-wrap { flex:1; display:flex; flex-direction:column; padding:16px; }
video { width:100%; max-height:70vh; background:#000; border-radius:8px; }
#now-playing { margin-top:10px; font-size:14px; color:#aaa; }
#error-box { margin-top:8px; font-size:13px; color:#f66; white-space:pre-wrap; }
.loading { padding:16px; color:#888; }