:root{--bg-deep: #1a1a2e;--bg-surface: #22223a;--bg-card: #2a2a45;--bg-input: #33334d;--accent: #f4a261;--accent-hover: #e68a3e;--text: #f0ead6;--text-muted: #a09db0;--text-dim: #6b6880;--border: #3a3a55;--msg-own: #3a3560;--msg-other: #2a2a45;--sidebar-w: 260px;--header-h: 52px;--radius: 14px;--radius-sm: 10px}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans,sans-serif;background:var(--bg-deep);color:var(--text);overflow:hidden}#app{display:flex;height:100%;width:100%}#sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);background:var(--bg-surface);display:flex;flex-direction:column;border-right:1px solid var(--border);z-index:20}#sidebar-header{padding:20px 18px 14px;border-bottom:1px solid var(--border)}#sidebar-header h1{font-size:22px;font-weight:700;letter-spacing:-.5px}.subtitle{font-size:12px;color:var(--text-muted);margin-top:2px}#channel-list{flex:1;overflow-y:auto;padding:10px 8px}.channel-btn{display:flex;align-items:center;gap:10px;width:100%;padding:10px 14px;border:none;border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);font-size:15px;cursor:pointer;transition:all .15s ease;text-align:left}.channel-btn:hover{background:var(--bg-card);color:var(--text)}.channel-btn.active{background:var(--accent);color:#1a1a2e;font-weight:600}.channel-icon{font-size:20px;width:28px;text-align:center;flex-shrink:0}.channel-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}#mobile-header{display:none;align-items:center;gap:12px;padding:0 14px;height:var(--header-h);background:var(--bg-surface);border-bottom:1px solid var(--border)}#mobile-header h1{font-size:18px}#sidebar-toggle{background:none;border:none;color:var(--text);font-size:22px;cursor:pointer;padding:4px 8px;border-radius:8px}#sidebar-toggle:hover{background:var(--bg-card)}#sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:15}#chat-area{flex:1;display:flex;flex-direction:column;min-width:0}#chat-header{display:flex;align-items:center;gap:12px;padding:12px 20px;background:var(--bg-surface);border-bottom:1px solid var(--border);min-height:var(--header-h)}#channel-icon{font-size:28px}#channel-name{font-size:17px;font-weight:600}#channel-topic{font-size:12px;color:var(--text-muted);margin-top:1px}#messages{flex:1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:6px;scroll-behavior:smooth}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:12px;color:var(--text-dim)}.empty-emoji{font-size:48px}.empty-state p{font-size:15px}.loading{display:flex;align-items:center;justify-content:center;padding:20px;color:var(--text-dim);font-size:14px}.msg{max-width:75%;padding:10px 14px;border-radius:var(--radius);font-size:14px;line-height:1.45;word-wrap:break-word;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.msg-other{background:var(--msg-other);align-self:flex-start;border-bottom-left-radius:4px}.msg-self{background:var(--msg-own);align-self:flex-end;border-bottom-right-radius:4px}.msg-author{font-size:12px;font-weight:600;color:var(--accent);margin-bottom:3px}.msg-self .msg-author{color:#c4b5fd}.msg-content{white-space:pre-wrap}.msg-time{font-size:10px;color:var(--text-dim);margin-top:4px;text-align:right}.date-sep{text-align:center;color:var(--text-dim);font-size:11px;padding:8px 0;position:relative}.date-sep:before,.date-sep:after{content:"";position:absolute;top:50%;width:30%;height:1px;background:var(--border)}.date-sep:before{left:5%}.date-sep:after{right:5%}#message-form{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--bg-surface);border-top:1px solid var(--border)}#message-form.hidden{display:none}#message-input{flex:1;padding:12px 16px;border:none;border-radius:24px;background:var(--bg-input);color:var(--text);font-size:15px;outline:none;transition:box-shadow .2s ease}#message-input::placeholder{color:var(--text-dim)}#message-input:focus{box-shadow:0 0 0 2px var(--accent)}#send-btn{width:44px;height:44px;border:none;border-radius:50%;background:var(--accent);color:#1a1a2e;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s ease,transform .1s ease;flex-shrink:0}#send-btn:hover{background:var(--accent-hover)}#send-btn:active{transform:scale(.93)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}.conn-status{display:flex;align-items:center;gap:6px;padding:6px 14px;font-size:12px;color:var(--text-muted);background:var(--bg-card);border-bottom:1px solid var(--border)}.conn-dot{width:8px;height:8px;border-radius:50%;background:#666;transition:background .3s}.conn-dot.connected{background:#4ade80}.conn-dot.connecting{background:#facc15;animation:pulse 1s infinite}.conn-dot.disconnected{background:#ef4444}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}@media(max-width:640px){#mobile-header{display:flex}#sidebar{position:fixed;left:-100%;top:0;bottom:0;width:80%;max-width:300px;transition:left .25s ease;box-shadow:4px 0 20px #0006}#sidebar.open{left:0}#sidebar-overlay.open{display:block}#chat-header{display:none}#messages{padding:12px}.msg{max-width:85%}#message-form{padding:8px 12px}#message-input{padding:10px 14px;font-size:16px}}