:root {
    --bg-main: #060709;
    --bg-card: #11131a;
    --bg-hover: #1a1d29;
    --border: rgba(255, 255, 255, 0.03);
    --text-main: #f8fafc;
    --text-muted: #475569;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0; padding: 0;
    display: flex; flex-direction: column;
    height: 100vh; overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

header {
    padding: 18px 30px;
    font-size: 16px; font-weight: 700;
    letter-spacing: 2px; text-transform: uppercase;
    border-bottom: 1px solid var(--border);
}

header span {
    background: linear-gradient(to right, #ffffff, #475569);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

#main-content { display: flex; flex-grow: 1; height: calc(100vh - 55px); overflow: hidden; }

#left-panel { flex: 1.5; background-color: #020304; display: flex; align-items: center; justify-content: center; padding: 30px; box-sizing: border-box; }

#player-wrapper { width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: 16px; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.9); border: 1px solid var(--border); }

#player-frame { width: 100%; height: 100%; border: none; background: #000; }

#right-panel { flex: 1; background-color: var(--bg-main); display: flex; flex-direction: column; border-left: 1px solid var(--border); overflow: hidden; }

#search-container { padding: 20px 25px 12px 25px; flex-shrink: 0; }

#search-input { width: 100%; background-color: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; color: var(--text-main); font-size: 13px; outline: none; box-sizing: border-box; font-family: inherit; }
#search-input:focus { background-color: var(--bg-hover); }

#tabs-container { padding: 0 25px 15px 25px; display: flex; flex-wrap: wrap; gap: 6px; flex-shrink: 0; }

.tab-btn { background: var(--bg-card); border: 1px solid var(--border); color: var(--text-muted); padding: 6px 14px; font-size: 11px; font-weight: 600; cursor: pointer; border-radius: 20px; outline: none; text-transform: uppercase; letter-spacing: 0.5px; }
.tab-btn:hover { color: var(--text-main); background-color: var(--bg-hover); }
.tab-btn.active { color: var(--text-main); background-color: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.1); }

#channel-container { flex-grow: 1; padding: 0 25px 25px 25px; overflow-y: auto; }
#channel-container::-webkit-scrollbar { width: 3px; }
#channel-container::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.02); border-radius: 10px; }

#channel-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }

.channel-btn { background: var(--bg-card); border: 1px solid var(--border); color: rgba(255, 255, 255, 0.7); padding: 16px 14px; border-radius: 12px; cursor: pointer; font-size: 13px; font-weight: 500; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; outline: none; }
.channel-btn:hover { background-color: var(--bg-hover); color: var(--text-main); }
.channel-btn.active { background: rgba(255, 255, 255, 0.05); border-color: rgba(255, 255, 255, 0.1); color: var(--text-main); font-weight: 600; }

@media (max-width: 950px) {
    #main-content { flex-direction: column; }
    #left-panel { flex: none; padding: 15px; }
    #right-panel { border-left: none; border-top: 1px solid var(--border); }
    #channel-list { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
}