*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--sidebar-w: 240px;--header-h: 48px;--input-h: 64px;--bg-main: #f0f2f5;--bg-sidebar: #1e1f22;--bg-sidebar-hover: #35373c;--bg-sidebar-active: #404249;--bg-chat: #ffffff;--bg-msg-own: #5865f2;--bg-msg-ai: #f0f4ff;--bg-input: #ebedef;--text-primary: #060607;--text-sidebar: #949ba4;--text-sidebar-active: #ffffff;--text-muted: #80848e;--text-ai: #2f54eb;--accent: #5865f2;--accent-hover: #4752c4;--danger: #ed4245;--ai-color: #2f54eb;--radius: 8px;--radius-msg: 16px;font-family:Segoe UI,system-ui,-apple-system,sans-serif;font-size:15px;-webkit-font-smoothing:antialiased}body{background:var(--bg-main);color:var(--text-primary)}.app-layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);background:var(--bg-sidebar);display:flex;flex-direction:column;overflow-y:auto;-webkit-user-select:none;user-select:none}.sidebar-header{padding:12px 16px;border-bottom:1px solid rgba(255,255,255,.06);height:var(--header-h);display:flex;align-items:center}.workspace-name{color:#fff;font-weight:700;font-size:15px}.sidebar-section{padding:8px 0}.section-header{display:flex;align-items:center;justify-content:space-between;padding:4px 8px 4px 16px;color:var(--text-sidebar);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.sidebar-item{display:flex;align-items:center;gap:8px;padding:6px 8px 6px 16px;cursor:pointer;border-radius:4px;margin:1px 8px;color:var(--text-sidebar);font-size:14px;transition:background .15s}.sidebar-item:hover{background:var(--bg-sidebar-hover);color:#fff}.sidebar-item.active{background:var(--bg-sidebar-active);color:var(--text-sidebar-active)}.sidebar-item.ai-item{color:#a78bfa}.sidebar-item.ai-item:hover{color:#c4b5fd}.sidebar-item.ai-item.active{background:var(--bg-sidebar-active);color:#c4b5fd}.room-icon{font-weight:600;opacity:.7}.unread-badge{margin-left:auto;background:#f23f42;color:#fff;font-size:11px;font-weight:700;min-width:18px;height:18px;border-radius:9px;padding:0 5px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.inline-form{display:flex;gap:4px;padding:4px 8px}.inline-form input{flex:1;padding:4px 8px;border-radius:4px;border:1px solid var(--accent);background:var(--bg-sidebar-hover);color:#fff;font-size:13px;outline:none}.inline-form button{padding:4px 10px;border-radius:4px;background:var(--accent);color:#fff;border:none;cursor:pointer;font-size:12px}.dm-user-list{padding:4px 8px;background:var(--bg-sidebar-hover);border-radius:4px;margin:0 8px}.dm-user-item{display:flex;align-items:center;gap:8px;padding:6px 8px;cursor:pointer;border-radius:4px;color:var(--text-sidebar);font-size:13px}.dm-user-item:hover{background:var(--bg-sidebar-active);color:#fff}.sidebar-section-grow{flex:1;overflow-y:auto}.user-item-name{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-item-username{font-size:11px;color:var(--text-sidebar);opacity:.6;white-space:nowrap}.sidebar-item:hover .user-item-username{opacity:.8}.sidebar-empty{padding:8px 16px;font-size:12px;color:var(--text-sidebar);opacity:.5}.sidebar-footer{margin-top:auto;padding:8px 12px;border-top:1px solid rgba(255,255,255,.06);display:flex;align-items:center;gap:8px}.user-info{display:flex;align-items:center;gap:8px;flex:1;overflow:hidden}.user-name{color:#fff;font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-username{color:var(--text-sidebar);font-size:11px}.avatar-sm{width:28px;height:28px;min-width:28px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;text-transform:uppercase}.btn-icon{background:none;border:none;cursor:pointer;color:var(--text-sidebar);font-size:18px;padding:2px 6px;border-radius:4px;line-height:1;transition:color .15s,background .15s}.btn-icon:hover{color:#fff;background:var(--bg-sidebar-active)}.chat-window{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg-chat)}.chat-window.empty{align-items:center;justify-content:center;background:var(--bg-main);position:relative}.chat-window.empty .btn-hamburger{position:absolute;top:10px;left:12px}.chat-header{height:var(--header-h);padding:0 20px;border-bottom:1px solid #e3e5e8;display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px;flex-shrink:0}.ai-badge{font-size:11px;background:#ede9fe;color:var(--ai-color);padding:2px 8px;border-radius:12px;font-weight:500}.empty-state{text-align:center;color:var(--text-muted)}.empty-icon{font-size:48px;margin-bottom:12px}.empty-state h2{margin-bottom:6px;color:var(--text-primary)}.message-list{flex:1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:2px}.load-more{text-align:center;margin-bottom:12px}.load-more button{background:none;border:1px solid #e3e5e8;border-radius:12px;padding:4px 16px;font-size:12px;color:var(--text-muted);cursor:pointer}.load-more button:hover{background:var(--bg-main)}.date-divider{text-align:center;margin:12px 0 8px;position:relative}.date-divider span{font-size:12px;color:var(--text-muted);background:#fff;padding:0 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.2s}.btn-send:hover:not(:disabled){background:var(--accent-hover)}.btn-send:disabled{background:#c4c9d4;cursor:not-allowed}.login-page{height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2)}.login-box{background:#fff;border-radius:12px;padding:40px;width:360px;box-shadow:0 20px 60px #00000026}.login-header{text-align:center;margin-bottom:28px}.login-logo{width:56px;height:56px;background:var(--accent);color:#fff;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:12px}.login-header h1{font-size:22px;font-weight:700;color:var(--text-primary)}.login-header p{font-size:13px;color:var(--text-muted);margin-top:4px}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text-primary)}.form-group input{width:100%;padding:10px 14px;border:1.5px solid #e3e5e8;border-radius:var(--radius);font-size:14px;outline:none;transition:border-color .2s;background:var(--bg-input)}.form-group input:focus{border-color:var(--accent);background:#fff}.error-msg{background:#fff0f0;border:1px solid #ffc9c9;color:var(--danger);padding:8px 12px;border-radius:var(--radius);font-size:13px;margin-bottom:12px}.btn-primary{width:100%;padding:12px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);font-size:15px;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:disabled{opacity:.7;cursor:not-allowed}.message-input-wrap{display:flex;flex-direction:column;border-top:1px solid #e3e5e8;background:var(--bg-chat);flex-shrink:0}.file-preview-bar{display:flex;align-items:center;gap:10px;padding:8px 16px;background:#f8f9ff;border-bottom:1px solid #e3e5e8}.file-preview-thumb{width:48px;height:48px;object-fit:cover;border-radius:6px;border:1px solid #e3e5e8;flex-shrink:0}.file-preview-icon{font-size:28px;flex-shrink:0}.file-preview-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.file-preview-name{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-preview-size{font-size:11px;color:var(--text-muted)}.upload-progress-bar{height:4px;background:#e3e5e8;border-radius:2px;overflow:hidden;margin-top:4px}.upload-progress-fill{height:100%;background:var(--accent);transition:width .2s}.upload-done{font-size:11px;color:#059669;font-weight:600}.file-preview-cancel{background:none;border:none;cursor:pointer;color:var(--text-muted);font-size:16px;padding:4px;border-radius:4px;flex-shrink:0}.file-preview-cancel:hover{background:#f0f2f5;color:var(--danger)}.message-input{border-top:none}.btn-attach{background:none;border:none;cursor:pointer;font-size:20px;padding:6px 8px;border-radius:6px;color:var(--text-muted);transition:background .15s;flex-shrink:0}.btn-attach:hover:not(:disabled){background:var(--bg-main);color:var(--accent)}.btn-attach:disabled{opacity:.4;cursor:not-allowed}.msg-image-wrap{cursor:pointer;display:inline-block;border-radius:10px;overflow:hidden;max-width:280px;margin-bottom:4px}.msg-image{display:block;max-width:280px;max-height:200px;object-fit:cover;transition:opacity .15s}.msg-image-wrap:hover .msg-image{opacity:.9}.msg-file-card{display:flex;align-items:center;gap:10px;background:#f8f9ff;border:1px solid #dde1f0;border-radius:10px;padding:10px 14px;text-decoration:none;color:inherit;max-width:280px;margin-bottom:4px;transition:background .15s}.msg-file-card:hover{background:#eef0fb}.msg-file-icon{font-size:24px;flex-shrink:0}.msg-file-info{flex:1;min-width:0}.msg-file-name{display:block;font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text-primary)}.msg-file-size{font-size:11px;color:var(--text-muted)}.msg-file-dl{font-size:16px;color:var(--accent);flex-shrink:0}.lightbox-overlay{position:fixed;inset:0;background:#000000d9;display:flex;align-items:center;justify-content:center;z-index:2000}.lightbox-box{position:relative;display:flex;flex-direction:column;align-items:center;gap:12px;max-width:90vw;max-height:90vh}.lightbox-img{max-width:90vw;max-height:80vh;object-fit:contain;border-radius:8px}.lightbox-close{position:absolute;top:-40px;right:0;background:#ffffff26;border:none;color:#fff;font-size:20px;width:36px;height:36px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center}.lightbox-close:hover{background:#ffffff40}.lightbox-download{color:#fff;font-size:13px;text-decoration:none;background:#ffffff26;padding:6px 16px;border-radius:20px;transition:background .15s}.lightbox-download:hover{background:#ffffff40}.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}.btn-members{background:none;border:1px solid #e3e5e8;border-radius:var(--radius);padding:4px 12px;font-size:13px;cursor:pointer;color:var(--text-muted);transition:all .15s}.btn-members:hover{background:var(--bg-main);color:var(--text-primary);border-color:#c4c9d4}.modal-overlay{position:fixed;inset:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:#fff;border-radius:12px;width:420px;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 24px 64px #0003;overflow:hidden}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid #e3e5e8}.modal-header h3{font-size:16px;font-weight:700}.modal-close{background:none;border:none;font-size:16px;cursor:pointer;color:var(--text-muted);padding:4px 8px;border-radius:4px}.modal-close:hover{background:var(--bg-main);color:var(--text-primary)}.modal-section{padding:12px 20px;overflow-y:auto}.modal-section+.modal-section{border-top:1px solid #e3e5e8}.modal-section-title{font-size:12px;font-weight:600;text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px;margin-bottom:8px}.modal-search{width:100%;padding:8px 12px;border:1px solid #e3e5e8;border-radius:var(--radius);font-size:13px;background:var(--bg-input);outline:none;margin-bottom:8px}.modal-search:focus{border-color:var(--accent)}.member-list{display:flex;flex-direction:column;gap:4px;max-height:200px;overflow-y:auto}.add-list{max-height:180px}.member-item{display:flex;align-items:center;gap:10px;padding:6px 8px;border-radius:var(--radius);transition:background .15s}.member-item:hover{background:var(--bg-main)}.member-info{flex:1;overflow:hidden}.member-name{font-size:13px;font-weight:600;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.member-username{font-size:11px;color:var(--text-muted)}.owner-badge{font-size:11px;background:#fef3c7;color:#d97706;padding:2px 8px;border-radius:10px;font-weight:500;white-space:nowrap}.btn-remove{background:none;border:1px solid #ffc9c9;border-radius:4px;padding:3px 8px;font-size:12px;color:var(--danger);cursor:pointer;white-space:nowrap;transition:all .15s}.btn-remove:hover:not(:disabled){background:#fff0f0}.btn-remove:disabled{opacity:.5;cursor:not-allowed}.btn-add{background:var(--accent);border:none;border-radius:4px;padding:4px 10px;font-size:12px;color:#fff;cursor:pointer;white-space:nowrap;transition:background .15s}.btn-add:hover:not(:disabled){background:var(--accent-hover)}.btn-add:disabled{opacity:.5;cursor:not-allowed}.empty-list{text-align:center;color:var(--text-muted);font-size:13px;padding:12px}.modal-lg{width:600px;max-width:95vw}.um-list-section{padding:0!important;max-height:340px;overflow-y:auto}.um-loading{padding:24px;text-align:center;color:var(--text-muted);font-size:13px}.um-table{width:100%;border-collapse:collapse;font-size:13px}.um-table thead tr{background:var(--bg-main)}.um-table th{padding:10px 14px;text-align:left;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.4px;color:var(--text-muted);border-bottom:1px solid #e3e5e8}.um-table td{padding:10px 14px;border-bottom:1px solid #f0f2f5;vertical-align:middle}.um-table tr:last-child td{border-bottom:none}.um-table tr:hover td{background:#fafbfc}.um-table tr.row-inactive td{opacity:.5}.um-user-cell{display:flex;align-items:center;gap:8px;font-weight:500}.text-muted{color:var(--text-muted)}.badge{display:inline-block;padding:2px 8px;border-radius:10px;font-size:11px;font-weight:600}.badge-admin{background:#ede9fe;color:#7c3aed}.badge-user{background:#f0f2f5;color:var(--text-muted)}.badge-active{background:#d1fae5;color:#065f46}.badge-inactive{background:#fef3c7;color:#92400e}.btn-toggle-form{background:none;border:1px dashed #c4c9d4;border-radius:var(--radius);padding:7px 14px;font-size:13px;color:var(--text-muted);cursor:pointer;width:100%;text-align:left;transition:all .15s}.btn-toggle-form:hover{border-color:var(--accent);color:var(--accent);background:#f5f5ff}.um-form{margin-top:14px;display:flex;flex-direction:column;gap:8px}.um-form-row{display:flex;gap:12px}.um-form-row .form-group{flex:1;margin-bottom:0}.um-form-row .form-group input{width:100%;padding:8px 12px;border:1.5px solid #e3e5e8;border-radius:var(--radius);font-size:13px;outline:none;background:var(--bg-input);transition:border-color .2s}.um-form-row .form-group input:focus{border-color:var(--accent);background:#fff}.um-form-row .form-group label{font-size:12px;font-weight:600;display:block;margin-bottom:5px;color:var(--text-primary)}.um-role-group{display:flex;flex-direction:column;justify-content:flex-end}.checkbox-label{display:flex;align-items:center;gap:6px;font-size:13px;cursor:pointer;padding:8px 0;color:var(--text-primary)}.checkbox-label input[type=checkbox]{width:15px;height:15px;cursor:pointer;accent-color:var(--accent)}.um-form-actions{display:flex;justify-content:flex-end;margin-top:4px}.btn-primary-sm{background:var(--accent);color:#fff;border:none;border-radius:var(--radius);padding:8px 20px;font-size:13px;font-weight:600;cursor:pointer;transition:background .15s}.btn-primary-sm:hover:not(:disabled){background:var(--accent-hover)}.btn-primary-sm:disabled{opacity:.7;cursor:not-allowed}.btn-admin{background:none;border:none;cursor:pointer;color:var(--text-sidebar);font-size:16px;padding:4px 6px;border-radius:4px;transition:color .15s,background .15s}.btn-admin:hover{color:#fff;background:var(--bg-sidebar-active)}.chat-window.with-topic-sidebar{flex-direction:row}.chat-window.with-topic-sidebar .chat-main{flex:1;display:flex;flex-direction:column;overflow:hidden}.topic-sidebar{width:200px;min-width:200px;background:var(--bg-sidebar);border-right:1px solid #2e3035;display:flex;flex-direction:column;overflow:hidden}.topic-sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 12px 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4px;transition:background .12s;min-width:0}.topic-item:hover{background:var(--bg-sidebar-hover);color:#fff}.topic-item.active{background:var(--bg-sidebar-active);color:var(--text-sidebar-active)}.topic-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-summary-dot{width:6px;height:6px;border-radius:50%;background:var(--ai-color);flex-shrink:0}.btn-rename-topic{background:none;border:none;cursor:pointer;color:var(--text-sidebar);font-size:12px;padding:1px 3px;border-radius:3px;opacity:0;transition:opacity .12s;flex-shrink:0}.topic-item:hover .btn-rename-topic{opacity:1}.topic-item.active .btn-rename-topic{opacity:.6}.btn-rename-topic:hover{opacity:1!important;background:var(--bg-sidebar-active)}.topic-rename-input{flex:1;padding:2px 4px;font-size:13px;border:1px solid var(--ai-color);border-radius:3px;background:#2b2d31;color:#fff;outline:none;min-width:0}.topic-empty{padding:8px 12px;font-size:12px;color:var(--text-sidebar);opacity:.5}.btn-hamburger{display:none;background:none;border:none;cursor:pointer;color:var(--text-muted);font-size:20px;padding:4px 8px;border-radius:6px;line-height:1;transition:background .15s;flex-shrink:0}.btn-hamburger:hover{background:var(--bg-main);color:var(--text-primary)}.sidebar-backdrop{display:none}@media(max-width:900px){:root{--sidebar-w: 200px}}@media(max-width:640px){:root{--sidebar-w: 280px}.btn-hamburger{display:flex;align-items:center;justify-content:center}.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:500;transform:translate(-100%);transition:transform .25s ease;box-shadow:none}.sidebar.open{transform:translate(0);box-shadow:4px 0 24px #00000059}.sidebar-backdrop{display:block;position:fixed;inset:0;background:#00000073;z-index:499;opacity:0;pointer-events:none;transition:opacity .25s ease}.sidebar-backdrop.visible{opacity:1;pointer-events:auto}.chat-window{width:100%}.chat-header{padding:0 12px;gap:8px}.message{max-width:85%}.message.ai-msg{max-width:90%}.message-list{padding:12px}.message-input{padding:8px 12px}.modal{width:95vw;max-height:90vh}.modal-lg{width:95vw}.login-box{width:92vw;padding:28px 20px}.chat-window.with-topic-sidebar{flex-direction:column}.topic-sidebar{width:100%;min-width:unset;max-height:180px;border-right:none;border-bottom:1px solid #2e3035;flex-direction:row;flex-wrap:wrap}.topic-sidebar-header{padding:8px 12px}.topic-list{flex-direction:row;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;padding:4px 8px;gap:4px}.topic-item{flex-shrink:0;white-space:nowrap;border-radius:16px;background:var(--bg-sidebar-hover)}.msg-image{max-width:220px;max-height:180px}.msg-file-card{max-width:240px}.um-table th:nth-child(3),.um-table td:nth-child(3){display:none}}