*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f4f5f7;color:#1a1a1a}.app{display:grid;grid-template-columns:88px 300px 1fr;height:100vh}.channels{background:#161a2b;display:flex;flex-direction:column;align-items:stretch;padding:12px 0}.channel{background:none;border:none;color:#aab0c6;padding:12px 4px;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:11px;cursor:pointer}.channel .icon{font-size:20px}.channel.active{color:#fff;background:#262c47;border-radius:8px;margin:0 6px}.conversation-list{background:#fff;border-right:1px solid #e4e6eb;overflow-y:auto;padding:16px}.conversation-list h2{font-size:16px;margin:0 0 12px}.conv-item{display:flex;gap:10px;align-items:center;padding:10px 8px;border-radius:8px;cursor:pointer}.conv-item:hover{background:#f0f1f4}.conv-item.active{background:#e8ecff}.conv-item .icon{font-size:18px}.conv-name{font-weight:600;font-size:14px}.conv-time{font-size:11px;color:#8a8f99}.thread{display:flex;flex-direction:column;height:100vh}.thread-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid #e4e6eb;background:#fff}.channel-tag{margin-left:8px;font-size:11px;text-transform:uppercase;color:#6b7280;background:#f0f1f4;padding:2px 8px;border-radius:10px}.call-btn{background:#22c55e;color:#fff;border:none;padding:8px 14px;border-radius:8px;cursor:pointer}.messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:8px}.bubble{max-width:60%;padding:10px 14px;border-radius:12px;font-size:14px}.bubble.inbound{align-self:flex-start;background:#fff;border:1px solid #e4e6eb}.bubble.outbound{align-self:flex-end;background:#4f46e5;color:#fff}.bubble-time{font-size:10px;opacity:.6;margin-top:4px}.composer{display:flex;gap:8px;padding:16px;border-top:1px solid #e4e6eb;background:#fff}.composer input{flex:1;padding:10px 14px;border:1px solid #d7d9e0;border-radius:20px;font-size:14px}.composer button{background:#4f46e5;color:#fff;border:none;padding:0 20px;border-radius:20px;cursor:pointer}.empty{color:#8a8f99;padding:20px}.conv-subject{font-size:12px;color:#4b5563;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:210px}.ticket-subject{font-size:12px;color:#6b7280;margin-top:2px}