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env(safe-area-inset-top));min-height:calc(var(--header-height) + env(safe-area-inset-top));padding:env(safe-area-inset-top) 20px 0;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--border);background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);z-index:10}.mobile-menu-btn{display:none}.channel-header-info{flex:1;min-width:0}.channel-title{font-size:1.05rem;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.channel-desc{font-size:.75rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.channel-header-actions{display:flex;align-items:center;gap:4px}.task-btn{position:relative}.task-badge{position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;padding:0 5px;background:var(--warning);color:#fff;font-size:.65rem;font-weight:700;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 2px 4px #00000040;pointer-events:none}.channel-search-bar{display:flex;align-items:center;gap:6px;background:var(--bg-surface);border:1px solid var(--border-accent);border-radius:var(--radius-md);padding:4px 10px;animation:searchSlideIn .2s ease;box-shadow:0 0 0 3px var(--accent-soft)}.channel-search-bar .search-icon{flex-shrink:0;color:var(--text-muted)}.channel-search-input{width:140px;background:transparent;border:none;outline:none;color:var(--text-primary);font-size:.88rem;font-family:inherit;line-height:1.5}.channel-search-input::placeholder{color:var(--text-muted)}@media(min-width:600px){.channel-search-input{width:200px}}.search-clear-btn{display:flex;align-items:center;justify-content:center;background:var(--bg-hover);border:none;border-radius:var(--radius-full);width:22px;height:22px;color:var(--text-muted);cursor:pointer;flex-shrink:0;transition:all var(--transition-fast)}.search-clear-btn:hover{background:var(--bg-active);color:var(--text-primary)}.icon-btn.active{background:var(--accent-soft);color:var(--accent)}@keyframes searchSlideIn{0%{opacity:0;transform:scaleX(.8);transform-origin:right}to{opacity:1;transform:scaleX(1);transform-origin:right}}.search-highlight{background:#fbbf244d;color:inherit;border-radius:2px;padding:0 1px}.search-results-bar{display:flex;align-items:center;gap:8px;padding:10px 16px;background:var(--accent-soft);border-bottom:1px solid var(--border-accent);color:var(--accent);font-size:.82rem;font-weight:600;animation:fadeIn .2s ease}.messages-container{flex:1;overflow-y:auto;overflow-x:hidden;scroll-behavior:smooth}.messages-list{padding:16px 20px;display:flex;flex-direction:column;gap:2px;min-height:100%}.messages-loading{display:none}.loading-spinner{width:32px;height:32px;border:3px solid var(--bg-elevated);border-top-color:var(--accent);border-radius:var(--radius-full);animation:spin .7s linear infinite}.date-divider{display:flex;align-items:center;gap:16px;margin:16px 0 8px}.date-divider:before,.date-divider:after{content:"";flex:1;height:1px;background:var(--border)}.date-divider span{font-size:.75rem;font-weight:600;color:var(--text-muted);white-space:nowrap;padding:4px 12px;background:var(--bg-surface);border-radius:var(--radius-full);border:1px solid var(--border)}.message{display:flex;gap:12px;padding:8px 12px;border-radius:var(--radius-md);transition:background var(--transition-fast);animation:fadeIn .3s ease;position:relative}.message:hover{background:var(--bg-surface)}.message-avatar{width:36px;height:36px;border-radius:var(--radius-sm);flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:1rem;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--accent),#5b4cd4)}.message-avatar.color-1{background:linear-gradient(135deg,#f97316,#ef4444)}.message-avatar.color-2{background:linear-gradient(135deg,#06b6d4,#3b82f6)}.message-avatar.color-3{background:linear-gradient(135deg,#10b981,#059669)}.message-avatar.color-4{background:linear-gradient(135deg,#8b5cf6,#6366f1)}.message-avatar.color-5{background:linear-gradient(135deg,#f43f5e,#e11d48)}.message-avatar.color-6{background:linear-gradient(135deg,#eab308,#f59e0b)}.message-body{flex:1;min-width:0}.message-header{display:flex;align-items:baseline;gap:8px;margin-bottom:4px}.message-author{font-weight:600;font-size:.9rem;color:var(--text-primary)}.message-time{font-size:.7rem;color:var(--text-muted)}.message-text{font-size:.92rem;line-height:1.55;color:var(--text-primary);word-break:break-word;max-width:100%;overflow-x:auto}.message-text 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var(--transition-fast)}.msg-action-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.message-reactions{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.reaction-badge{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;background:var(--accent-soft);border:1px solid var(--border-accent);border-radius:var(--radius-full);font-size:.78rem;cursor:pointer;transition:all var(--transition-fast)}.reaction-badge:hover{background:var(--accent-glow);transform:scale(1.05)}.reaction-badge.active{border-color:var(--accent);background:var(--accent-soft)}.reaction-badge .reaction-count{color:var(--accent);font-weight:600}.message-images{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.image-skeleton-wrapper{position:relative;border-radius:var(--radius-md);overflow:hidden;min-width:120px;min-height:160px;max-width:320px;max-height:240px;aspect-ratio:4/3;width:100%;background:var(--bg-elevated)}.image-skeleton-pulse{position:absolute;inset:0;background:linear-gradient(90deg,var(--bg-elevated) 0%,rgba(255,255,255,.05) 40%,var(--bg-elevated) 100%);background-size:200% 100%;animation:shimmer 1.6s ease-in-out infinite;border-radius:inherit}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.message-image-thumb{display:block;position:relative;z-index:1;max-width:320px;max-height:240px;width:100%;height:auto;border-radius:var(--radius-md);cursor:pointer;object-fit:cover;border:1px solid var(--border);opacity:0;content-visibility:auto;transition:opacity .4s ease,border-color var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast)}.message-image-thumb.loaded{opacity:1}.message-image-thumb.loaded~.image-skeleton-pulse,.image-skeleton-wrapper:has(.loaded) .image-skeleton-pulse{display:none}.message-image-thumb:hover{border-color:var(--accent);box-shadow:var(--shadow-glow);transform:scale(1.01)}.link-preview{margin-top:8px;max-width:420px;padding:12px 14px;background:var(--bg-surface);border-left:3px solid var(--accent);border-radius:0 var(--radius-md) var(--radius-md) 0;display:flex;flex-direction:column;gap:6px;transition:background var(--transition-fast)}.link-preview:hover{background:var(--bg-elevated)}.link-preview-domain{font-size:.7rem;color:var(--text-muted);font-weight:500;text-transform:uppercase;letter-spacing:.3px}.link-preview-title{font-size:.88rem;font-weight:600;color:var(--accent);line-height:1.3}.link-preview-title:hover{text-decoration:underline}.link-preview-desc{font-size:.8rem;color:var(--text-secondary);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.link-preview-image-container{margin-top:6px;border-radius:var(--radius-sm);overflow:hidden;max-height:200px;border:1px solid var(--border)}.link-preview-image{display:block;width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}.link-preview:hover .link-preview-image{transform:scale(1.03)}.message-thread-indicator{display:inline-flex;align-items:center;gap:6px;margin-top:6px;padding:4px 10px;background:var(--accent-soft);border-radius:var(--radius-sm);font-size:.78rem;color:var(--accent);font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.message-thread-indicator:hover{background:var(--accent-glow)}.message-thread-indicator svg{width:14px;height:14px}.message.compact{padding-top:2px;padding-bottom:2px}.message.compact .message-avatar{visibility:hidden;width:36px}.message.compact .message-header{display:none}.drop-overlay{position:absolute;inset:0;background:#0f1117e0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;display:flex;align-items:center;justify-content:center;animation:fadeIn .2s ease}.drop-overlay-content{text-align:center;color:var(--accent);animation:dropBounce .4s ease}.drop-overlay-content h3{font-size:1.4rem;margin-top:12px}.drop-overlay-content p{color:var(--text-muted);margin-top:6px;font-size:.85rem}.image-preview-bar{padding:10px 20px;border-top:1px solid 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var(--transition-fast)}.composer:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft),0 0 20px var(--accent-glow)}.composer-toolbar{display:flex;align-items:center;gap:2px;padding:6px 8px;border-bottom:1px solid var(--border)}.toolbar-btn{width:30px;height:28px;display:flex;align-items:center;justify-content:center;border:none;background:transparent;color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast)}.toolbar-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.toolbar-btn.active{background:var(--accent-soft);color:var(--accent)}.toolbar-separator{width:1px;height:18px;background:var(--border);margin:0 4px}.composer-input-wrapper{display:flex;align-items:flex-end;padding:4px 8px 6px}.message-input{flex:1;min-height:38px;max-height:160px;padding:8px 10px;color:var(--text-primary);font-family:inherit;font-size:16px;line-height:1.5;outline:none;overflow-y:auto;word-break:break-word;resize:none}.message-input:empty:before{content:attr(data-placeholder);color:var(--text-muted);pointer-events:none}.send-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--accent-gradient);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;flex-shrink:0;transition:all var(--transition-fast);opacity:.5;box-shadow:0 2px 8px var(--accent-glow)}.send-btn:not(:disabled){opacity:1}.send-btn:not(:disabled):hover{transform:scale(1.08);box-shadow:0 4px 16px var(--accent-glow)}.send-btn:disabled{cursor:not-allowed}app-thread-panel{height:100%;overflow:hidden}.thread-panel{width:var(--thread-width);min-width:var(--thread-width);height:100%;max-height:100%;border-left:1px solid var(--border);background:var(--bg-sidebar);display:flex;flex-direction:column;animation:slideInRight .3s ease;padding-bottom:env(safe-area-inset-bottom)}.thread-header{height:calc(var(--header-height) + env(safe-area-inset-top));min-height:calc(var(--header-height) + env(safe-area-inset-top));padding:env(safe-area-inset-top) 16px 0;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.thread-header h3{font-size:1rem;font-weight:700}.thread-parent-msg{padding:16px;border-bottom:1px solid var(--border);max-height:40vh;overflow-y:auto}.thread-divider{padding:8px 16px;display:flex;align-items:center;gap:8px;font-size:.75rem;color:var(--text-muted);font-weight:500}.thread-divider:after{content:"";flex:1;height:1px;background:var(--border)}.thread-replies{flex:1;overflow-y:auto;padding:8px 0}.thread-composer{padding:12px 16px;border-top:1px solid var(--border);display:flex;gap:8px;align-items:flex-end}.thread-input{flex:1;min-height:36px;max-height:80px;padding:8px 12px;background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color var(--transition-fast);font-size:16px;resize:none}.thread-input:focus{border-color:var(--accent)}.modal-overlay{position:fixed;inset:0;background:#0000008c;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);z-index:1000;display:flex;align-items:center;justify-content:center;animation:fadeIn .2s ease;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);box-sizing:border-box}.modal{width:90%;max-width:440px;background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg),0 0 40px #0003;animation:scaleIn .3s cubic-bezier(.34,1.56,.64,1);overflow:hidden}.modal-sm{max-width:360px}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;border-bottom:1px solid var(--border)}.modal-header h3{font-size:1.05rem;font-weight:700}.modal-form{padding:20px 24px;display:flex;flex-direction:column;gap:16px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px}.image-viewer-overlay{position:fixed;inset:0;background:#000000eb;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:10000;display:flex;align-items:center;justify-content:center;animation:fadeIn .2s ease;cursor:zoom-out}.image-viewer-close{position:absolute;top:16px;right:16px;width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:#ffffff1a;border:none;border-radius:var(--radius-full);color:#fff;cursor:pointer;transition:background var(--transition-fast);z-index:1}.image-viewer-close:hover{background:#fff3}#image-viewer-img{max-width:90vw;max-height:90vh;object-fit:contain;border-radius:var(--radius-md);animation:scaleIn .3s ease}.emoji-picker{position:absolute;bottom:calc(var(--composer-min-height) + 10px);left:20px;width:320px;max-height:300px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:500;display:flex;flex-direction:column;animation:scaleIn .2s ease;overflow:hidden}.emoji-picker-header{padding:10px 12px;border-bottom:1px solid var(--border)}.emoji-search-input{width:100%;padding:8px 12px;background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-family:inherit;font-size:.85rem;outline:none}.emoji-search-input:focus{border-color:var(--accent)}.emoji-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:2px;padding:8px;overflow-y:auto;max-height:220px}.emoji-btn{width:100%;aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius-sm);font-size:1.3rem;cursor:pointer;transition:all var(--transition-fast)}.emoji-btn:hover{background:var(--bg-hover);transform:scale(1.15)}@media(max-width:900px){.sidebar{position:fixed;left:0;top:0;bottom:0;z-index:500;transform:translate(-100%);transition:transform var(--transition-base);width:var(--sidebar-width);min-width:var(--sidebar-width)}.sidebar.collapsed{width:var(--sidebar-width);min-width:var(--sidebar-width)}.sidebar.mobile-open{transform:translate(0);box-shadow:var(--shadow-lg)}.sidebar-overlay{position:fixed;inset:0;background:#00000080;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);z-index:499;opacity:1;transition:opacity var(--transition-base);display:block;cursor:pointer;touch-action:manipulation}.sidebar-collapse-btn{display:none}.mobile-menu-btn{display:flex;width:40px;height:40px;margin-right:-8px}.thread-panel{position:fixed;right:0;top:0;bottom:0;z-index:501;box-shadow:var(--shadow-lg)}}@media(max-width:600px){.emoji-picker{width:calc(100vw - 40px);left:20px}.message{padding-right:24px;padding-left:10px}.message-image-thumb,.link-preview{max-width:100%}.message-input,.form-group input,.emoji-search-input,.thread-input{font-size:16px!important}}.toast-container{position:fixed;bottom:20px;right:20px;z-index:3000;display:flex;flex-direction:column;gap:8px}.toast{padding:12px 18px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);font-size:.85rem;color:var(--text-primary);display:flex;align-items:center;gap:10px;animation:slideInRight .3s ease;min-width:240px}.toast.success{border-left:3px solid var(--success)}.toast.error{border-left:3px solid var(--danger)}.toast.info{border-left:3px solid var(--info)}.toast-close{margin-left:auto;background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:1.2rem}.reaction-picker{position:absolute;bottom:100%;right:0;display:flex;gap:2px;padding:6px 8px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);z-index:50;animation:scaleIn .15s ease}.reaction-picker-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius-sm);font-size:1.1rem;cursor:pointer;transition:all var(--transition-fast)}.reaction-picker-btn:hover{background:var(--bg-hover);transform:scale(1.2)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center;color:var(--text-muted);animation:fadeIn .5s ease}.empty-state svg{width:64px;height:64px;margin-bottom:16px;opacity:.3}.empty-state h3{font-size:1.1rem;color:var(--text-secondary);margin-bottom:6px}.empty-state p{font-size:.85rem;max-width:300px}pre.shiki code,pre.shiki span{background:transparent!important;font-size:12px}.file-link-badge{display:inline-flex;align-items:center;gap:6px;background:var(--bg-elevated, #1e293b);padding:3px 6px 3px 8px;border-radius:6px;font-size:.85rem;font-family:JetBrains Mono,Fira Code,Consolas,monospace;border:1px solid var(--border, rgba(148, 163, 184, .2));transition:all .2s ease;white-space:nowrap;vertical-align:middle;margin:0 4px}.file-link-badge:hover{border-color:var(--accent, #3b82f6);box-shadow:0 0 5px #3b82f633}.file-link-icon{color:var(--text-muted, #94a3b8);display:flex;align-items:center}.file-link-name{color:var(--text-primary, #e2e8f0);font-weight:500}.file-link-lines{color:var(--accent, #3b82f6);font-size:.8rem;font-weight:600}.file-link-copy{background:transparent;border:none;color:var(--text-muted, #94a3b8);cursor:pointer;padding:2px;margin-left:2px;display:inline-flex;align-items:center;border-radius:4px;transition:all .2s ease}.file-link-copy:hover{background:#ffffff1a;color:var(--text-primary, #e2e8f0)}.file-link-badge.copied{border-color:var(--success, #10b981);background:#10b9811a}.file-link-badge.copied .file-link-name,.file-link-badge.copied .file-link-icon,.file-link-badge.copied .file-link-lines,.file-link-badge.copied .file-link-copy{color:var(--success, #10b981)!important}.file-link-badge.copied .file-link-icon svg,.file-link-badge.copied .file-link-copy svg{stroke:var(--success, #10b981)!important}