*{box-sizing:border-box}
:root{color-scheme:dark;font-family:Arial,Helvetica,sans-serif;background:#0b1118;color:#e8edf2}
body{margin:0;min-height:100vh;background:#0b1118}
.topbar{height:76px;padding:0 28px;background:#111b26;border-bottom:1px solid #263544;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand-block{display:flex;align-items:center;gap:14px}
.brand{font-size:28px;font-weight:800;letter-spacing:2px;color:#fff}
.brand-title{font-size:15px;font-weight:700;letter-spacing:.3px}
.brand-subtitle,.eyebrow{font-size:10px;letter-spacing:1.8px;color:#8192a3;margin-top:4px}
.top-actions{display:flex;align-items:center;gap:14px}
.overall-status{font-size:11px;font-weight:700;letter-spacing:.7px;color:#9baaba}
.overall-status.good{color:#24d18a}.overall-status.bad{color:#ff555d}
button{font:inherit;cursor:pointer}
.secondary-button{background:#202d3a;border:1px solid #3a4a5b;color:#d9e1e8;border-radius:5px;padding:9px 13px;font-size:11px}
.secondary-button.enabled{border-color:#b98232;color:#ffd28b}
.layout{display:flex;gap:22px;padding:24px;max-width:1440px;margin:0 auto;min-height:calc(100vh - 126px)}
.sidebar{width:245px;flex:0 0 245px;background:#111b26;border:1px solid #263544;border-radius:8px;padding:14px;align-self:flex-start;min-height:250px}
.sidebar-heading{display:flex;justify-content:space-between;align-items:center;font-size:11px;font-weight:700;letter-spacing:1.4px;color:#aebbc8;padding:3px 3px 13px;border-bottom:1px solid #263544;margin-bottom:8px}
.count{background:#263544;border-radius:10px;padding:3px 8px;color:#dbe4ec}
#channelList{display:flex;flex-direction:column;gap:5px}
.channel-item{width:100%;display:flex;align-items:center;gap:10px;text-align:left;background:transparent;border:1px solid transparent;border-radius:5px;padding:11px 9px;color:#dce4eb}
.channel-item:hover{background:#1a2937}
.channel-item.selected{background:#1d3040;border-color:#3a566e}
.channel-label{font-size:13px;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.channel-state{font-size:9px;color:#8495a5;white-space:nowrap}
.led{width:10px;height:10px;border-radius:50%;flex:0 0 10px;background:#788592}
.led.pending{background:#d6a84e}.led.online{background:#20d58b;box-shadow:0 0 8px #20d58b88}
.led.offline{background:#ff454f;box-shadow:0 0 8px #ff454f99;animation:blink 1s infinite}
@keyframes blink{0%,48%{opacity:1}49%,100%{opacity:.18}}
.sidebar-note,.empty-list{font-size:11px;line-height:1.5;color:#788a9b;margin:15px 4px 3px}
.viewer{flex:1;min-width:0;max-width:900px;margin:0 auto}
.viewer-heading{display:flex;align-items:center;justify-content:space-between;margin:2px 0 13px}
.selected-name{font-size:17px;font-weight:700;margin-top:5px}
.player-status{font-size:10px;letter-spacing:1px;color:#90a1b0;background:#172431;border:1px solid #2c3c4b;border-radius:4px;padding:7px 10px}
.player-frame{width:100%;max-width:720px;aspect-ratio:3/2;background:#030609;border:1px solid #263544;border-radius:5px;overflow:hidden;position:relative;display:flex;align-items:center;justify-content:center}
#player{width:100%;height:100%;object-fit:contain;background:#030609}
.player-placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:#647789;font-size:13px;pointer-events:none;background:#030609}
.player-placeholder[hidden]{display:none}
.placeholder-icon{font-size:42px;color:#415365}
.player-toolbar{width:100%;max-width:720px;display:flex;justify-content:space-between;align-items:center;padding:12px 0}
.player-message{font-size:11px;color:#8495a5}
.stop-button{background:#8d2730;border:1px solid #b83d47;border-radius:4px;color:#fff;font-size:11px;font-weight:700;letter-spacing:.7px;padding:10px 16px}
.stop-button:disabled{opacity:.35;cursor:not-allowed}
.viewer-footnote{font-size:10px;color:#647789;border-top:1px solid #1d2a36;padding-top:13px;max-width:720px}
footer{border-top:1px solid #1d2a36;padding:15px 28px;color:#637587;font-size:10px;letter-spacing:.4px}
footer span{padding:0 5px;color:#a4b1bd}
@media(max-width:700px){.topbar{height:auto;min-height:76px;padding:14px;align-items:flex-start;flex-direction:column}.top-actions{width:100%;justify-content:space-between}.layout{padding:14px;gap:14px;flex-direction:column}.sidebar{width:100%;flex:auto}.viewer{width:100%}.channel-item{padding:9px}.player-frame{max-width:100%}}