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8px;min-height:0}.topics-panel-footer{padding:8px;border-top:1px solid var(--border)}.topic-add-btn{width:100%;justify-content:center}.topic-item{display:flex;align-items:center;gap:6px;padding:7px 8px;border-radius:var(--radius-md);cursor:pointer;color:var(--text-primary);font-size:13px;transition:background var(--transition),color var(--transition)}.topic-item:hover{background:var(--bg-hover)}.topic-item.active{background:var(--bg-active);color:var(--accent)}.topic-item:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.topic-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-badge{flex-shrink:0}.topic-delete{display:flex;align-items:center;justify-content:center;width:18px;height:18px;flex-shrink:0;border-radius:var(--radius-sm);color:var(--text-tertiary);opacity:0;cursor:pointer;transition:opacity var(--transition),color var(--transition),background var(--transition)}.topic-item:hover .topic-delete{opacity:1}.topic-delete:hover{background:var(--danger-soft);color:var(--danger)}.learning-content{flex:1;min-width:0;display:flex;flex-direction:column;overflow-y:auto;background:var(--bg-surface);padding:18px 22px 28px;gap:16px}.learning-empty{align-items:center;justify-content:center;color:var(--text-tertiary);font-family:var(--font-serif);font-size:15px}.learning-breadcrumb{flex-shrink:0}.topic-description{margin:-8px 0 0;font-size:12.5px;color:var(--text-secondary);line-height:1.5}.section-title{margin:0;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary)}.panel-empty{margin:8px 0 0;font-size:12.5px;color:var(--text-tertiary)}.panel-error{margin:8px 0 0;padding:10px 12px;font-size:12.5px;color:var(--danger);background:var(--danger-soft);border-radius:var(--radius-md)}.confirm-text{margin:0;font-size:13px;line-height:1.6;color:var(--text-secondary)}.form-stack{display:flex;flex-direction:column;gap:12px}.course-section{display:flex;flex-direction:column;gap:10px;flex-shrink:0}.course-panel{display:flex;flex-wrap:wrap;gap:10px}.course-card{position:relative;display:flex;flex-direction:column;gap:4px;width:190px;min-height:92px;padding:12px 13px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:box-shadow var(--transition),border-color var(--transition)}.course-card:hover{box-shadow:var(--shadow-md);border-color:var(--border-strong)}.course-name{font-size:13px;font-weight:600;color:var(--text-primary);padding-right:42px;line-height:1.35}.course-meta{font-size:11.5px;color:var(--text-secondary)}.course-position{margin-top:auto;align-self:flex-start;font-family:var(--font-mono);font-size:11.5px;color:var(--accent);background:var(--accent-soft);padding:2px 7px;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition)}.course-position:hover{background:#007aff2e}.course-card-actions{position:absolute;top:8px;right:8px;display:flex;gap:2px;opacity:0;transition:opacity var(--transition)}.course-card:hover .course-card-actions{opacity:1}.card-action{display:flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:var(--radius-sm);color:var(--text-tertiary);cursor:pointer;transition:background var(--transition),color var(--transition)}.card-action:hover{background:var(--bg-hover);color:var(--text-primary)}.card-action-danger:hover{background:var(--danger-soft);color:var(--danger)}.course-card-add{align-items:center;justify-content:center;color:var(--text-tertiary);border-style:dashed;box-shadow:none;cursor:pointer;transition:color var(--transition),border-color var(--transition),background var(--transition)}.course-card-add:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-soft);box-shadow:none}.course-card-add:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.tree-and-detail{display:flex;gap:16px;align-items:flex-start;min-height:0}.tree-section{flex:1;min-width:0;display:flex;flex-direction:column;gap:8px}.tree-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px}.content-tree{display:flex;flex-direction:column}.tree-node{position:relative;display:flex;align-items:center;gap:6px;padding:6px 8px;border-radius:var(--radius-md);cursor:pointer;font-size:13px;color:var(--text-primary);transition:background var(--transition)}.tree-node:hover{background:var(--bg-hover)}.tree-node.selected{background:var(--bg-active)}.node-gutter{width:3px;align-self:stretch;min-height:16px;border-radius:2px;flex-shrink:0;background:var(--status-todo)}.node-gutter-active{background:var(--status-active)}.node-gutter-done{background:var(--status-done)}.node-gutter-paused{background:var(--status-paused)}.node-gutter-todo{background:var(--status-todo)}.node-chevron{display:flex;align-items:center;justify-content:center;width:16px;height:16px;flex-shrink:0;border-radius:var(--radius-sm);color:var(--text-tertiary);cursor:pointer;transition:transform var(--transition),color var(--transition)}.node-chevron.open{transform:rotate(90deg)}.node-chevron:hover{color:var(--text-primary)}.node-chevron-spacer{width:16px;flex-shrink:0}.node-title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.node-status-trigger{flex-shrink:0;cursor:pointer;border-radius:var(--radius-sm)}.node-status-trigger:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.status-menu{min-width:116px}.node-actions{display:flex;gap:2px;flex-shrink:0;opacity:0;transition:opacity var(--transition)}.tree-node:hover .node-actions,.tree-node.selected .node-actions{opacity:1}.node-detail-panel{width:288px;min-width:288px;flex-shrink:0;display:flex;flex-direction:column;background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}.node-detail-panel.collapsed{min-width:0;width:168px}.detail-header{display:flex;align-items:center;gap:6px;padding:9px 10px;border-bottom:1px solid var(--border)}.node-detail-panel.collapsed .detail-header{border-bottom:none}.detail-title{flex:1;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary)}.detail-body{display:flex;flex-direction:column;gap:12px;padding:12px}.detail-field{display:flex;flex-direction:column;gap:5px}.detail-notes-label{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.detail-saving{font-size:10.5px;color:var(--text-tertiary)}.inline-edit-input{-moz-appearance:none;appearance:none;-webkit-appearance:none;font-family:inherit;font-size:12.5px;color:var(--text-primary);background:var(--bg-surface);border:1px solid var(--accent);border-radius:var(--radius-sm);padding:4px 7px;outline:none;min-width:0;box-shadow:0 0 0 3px var(--accent-soft)}.node-title-input{flex:1}.detail-title-input{width:100%;font-size:13px;border-color:var(--border-strong);box-shadow:none}.detail-title-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.notes-textarea{-moz-appearance:none;appearance:none;-webkit-appearance:none;resize:vertical;min-height:128px;padding:9px 10px;font-family:var(--font-ui);font-size:12.5px;line-height:1.6;color:var(--text-primary);background:var(--bg-surface);border:1px solid var(--border-strong);border-radius:var(--radius-md);outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.notes-textarea::placeholder{color:var(--text-tertiary)}.notes-textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.skeleton-list{display:flex;flex-direction:column;gap:8px;padding:6px 0}.skeleton-row{height:28px;border-radius:var(--radius-md);background:linear-gradient(90deg,var(--bg-hover) 25%,rgba(0,0,0,.02) 37%,var(--bg-hover) 63%);background-size:400% 100%;animation:skeleton-shimmer 1.4s ease-in-out infinite}.course-card-skeleton{border-style:solid;box-shadow:none;background:linear-gradient(90deg,var(--bg-hover) 25%,rgba(0,0,0,.02) 37%,var(--bg-hover) 63%);background-size:400% 100%;animation:skeleton-shimmer 1.4s ease-in-out infinite}@keyframes skeleton-shimmer{0%{background-position:100% 50%}to{background-position:0 50%}}