:root{--bg-white: #FFFFFF;--bg-page: #F5F7FA;--accent-blue: #4A90E2;--accent-blue-light: #EBF3FC;--text-primary: #1F2937;--text-secondary: #6B7280;--text-muted: #9CA3AF;--border-light: #E5E7EB;--border-input: #D1D5DB;--danger-red: #E57373;--success-green: #81C784;--gray: #B0BEC5;--sidebar-width: 200px;--right-panel-width: 280px;--header-height: 48px;--border-radius: 8px;--border-radius-sm: 4px;--shadow-sm: 0 1px 3px rgba(0,0,0,.06);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--transition: all .2s ease}*{margin:0;padding:0;box-sizing:border-box}html{font-size:14px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft 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slideInRight{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.tree-node{display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;transition:var(--transition);min-height:36px}.tree-node:hover{background:var(--bg-page)}.tree-toggle{display:flex;align-items:center;justify-content:center;width:16px;height:16px;transition:transform .2s}.tree-toggle.hidden{visibility:hidden}.tree-toggle.expanded{transform:rotate(90deg)}.tree-label{flex:1;font-size:13px;font-weight:500}.tree-count{font-size:11px;color:var(--text-muted);background:var(--bg-page);padding:1px 6px;border-radius:10px}.tree-actions{display:flex;gap:2px;opacity:0;transition:opacity .15s}.tree-node:hover .tree-actions{opacity:1}.timeline-item{position:relative;padding:16px 0 16px 28px;display:flex;align-items:flex-start}.timeline-dot{position:absolute;left:0;top:20px;width:10px;height:10px;border-radius:50%;z-index:1}.timeline-line{position:absolute;left:4px;top:30px;bottom:-16px;width:2px;background:var(--border-light)}.timeline-content{flex:1}.timeline-header{display:flex;align-items:center;gap:10px;margin-bottom:4px}.timeline-title{font-size:14px;font-weight:600}.timeline-date{font-size:12px;color:var(--text-muted)}.timeline-body{font-size:13px;color:var(--text-secondary);line-height:1.6}.meeting-card{display:flex;gap:16px;padding:4px 0}.meeting-card-left{display:flex;flex-direction:column;align-items:center;position:relative;width:48px;flex-shrink:0}.meeting-date-badge{text-align:center;border-radius:8px;padding:6px 8px;background:var(--accent-blue-light);z-index:1}.meeting-month{font-size:10px;color:var(--accent-blue);font-weight:500}.meeting-day{font-size:18px;font-weight:700;color:var(--accent-blue);line-height:1}.meeting-timeline-line{flex:1;width:2px;background:var(--border-light);margin-top:4px}.meeting-card-content{flex:1;padding-bottom:16px}.meeting-header{display:flex;align-items:center;gap:8px;margin-bottom:6px}.meeting-title{font-size:14px;font-weight:600}.meeting-summary{font-size:13px;color:var(--text-secondary);line-height:1.6;margin-bottom:8px}.meeting-meta{display:flex;align-items:center;gap:16px;font-size:12px;color:var(--text-muted)}.meeting-participants{color:var(--accent-blue)}.view-toggle{display:flex;border:1px solid var(--border-light);border-radius:6px;overflow:hidden}.view-toggle button{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;background:var(--bg-white);cursor:pointer;transition:var(--transition)}.view-toggle button svg{width:16px;height:16px;color:var(--text-muted)}.view-toggle button.active{background:var(--accent-blue-light)}.view-toggle button.active svg{color:var(--accent-blue)}.view-toggle button:hover:not(.active){background:var(--bg-page)}.toolbar{display:flex;align-items:center;gap:10px}.toolbar-spacer{flex:1}