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button{display:block;width:100%;background:none;border:none;color:#ddd;font-size:13px;padding:6px 16px;text-align:left;cursor:pointer}.tree-header-dropdown button:hover{background:#ffffff1a}.editor-pane{flex:1;min-width:200px;overflow:hidden;display:flex;flex-direction:column}.preview-pane{flex:1;min-width:200px;overflow:hidden;display:flex;flex-direction:column;background:#fff}.file-preview{flex:1;display:flex;flex-direction:column;overflow:hidden;background:#1e1e1e}.file-preview-header{padding:8px 12px;font-size:12px;color:#fff9;border-bottom:1px solid #333;background:#252525}.file-preview-content{flex:1;overflow:auto;display:flex;align-items:center;justify-content:center;padding:16px}.file-preview-image{max-width:100%;max-height:100%;object-fit:contain}.file-preview-pdf{width:100%;height:100%;border:none}.file-preview-error,.file-preview-unsupported{color:var(--text-muted);text-align:center;font-size:14px}.file-preview-unsupported a{color:var(--accent)}.editor-placeholder{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:15px}.editor-container{flex:1;overflow:hidden}.editor-container .cm-editor{height:100%}.cm-search button{cursor:pointer}.cm-search button[name=next],.cm-search button[name=prev]{font-size:0;padding:2px 6px}.cm-search button[name=next]:after{content:"›";font-size:15px}.cm-search button[name=prev]:after{content:"‹";font-size:15px}.cm-search button[name=select]{display:none}.cm-search button[name=close]{font-size:18px;color:#ccc;padding:2px 6px}.cm-search button[name=close]:hover{color:#fff}.pdf-viewer{display:flex;flex-direction:column;height:100%}.pdf-canvas-wrap{flex:1;overflow:auto;display:flex;justify-content:center;padding:16px;background:#e8e8e8}.pdf-canvas-wrap canvas{box-shadow:0 1px 6px #0003;background:#fff;display:block}.pdf-nav{display:flex;align-items:center;justify-content:center;gap:12px;padding:8px;background:#f5f5f5;border-top:1px solid #ddd;flex-shrink:0}.pdf-nav-btn{background:#fff;border:1px solid #ccc;padding:4px 12px;border-radius:var(--radius);font-size:13px;cursor:pointer}.pdf-nav-btn:hover:not(:disabled){background:#e8e8e8}.pdf-nav-btn:disabled{opacity:.4;cursor:not-allowed}.pdf-page-info{font-size:13px;color:var(--text-dark)}.pdf-download-btn{margin-left:auto;background:#1976d2;color:#fff;border-color:#1976d2}.pdf-download-btn:hover:not(:disabled){background:#1565c0}.pdf-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:12px;color:#999;font-size:15px;background:#f0f0f0}@media(max-width:700px){.editor-layout{flex-direction:column}.file-tree-pane{display:none}.preview-pane{border-left:none;border-top:2px solid #ccc;min-height:250px}.project-grid{grid-template-columns:1fr}}.mathlive-dialog{background:#2a2a3d;border-radius:10px;width:600px;max-width:95vw;padding:24px;position:relative;color:#e0e0e0;box-shadow:0 4px 30px #00000080}.mathlive-dialog h3{margin:0 0 4px;font-size:18px;color:#fff}.mathlive-hint{font-size:13px;color:#888;margin-bottom:16px}.mathlive-field{display:block;width:100%;min-height:60px;font-size:22px;background:#1e1e2e;color:#fff;border:1px solid #3a3a50;border-radius:6px;padding:12px;--selection-background-color: rgba(76, 175, 80, .3)}.mathlive-field:focus-within{border-color:#4caf50}.mathlive-controls{display:flex;align-items:center;justify-content:space-between;margin-top:16px;flex-wrap:wrap;gap:12px}.mathlive-mode-toggle{display:flex;gap:16px;font-size:13px;color:#bbb}.mathlive-mode-toggle label{display:flex;align-items:center;gap:4px;cursor:pointer}.mathlive-mode-toggle code{font-size:11px;color:#888}.mathlive-actions{display:flex;gap:8px}.mathlive-btn-cancel{background:transparent;color:#999;border:1px solid #555;padding:8px 20px;border-radius:4px;font-size:13px;cursor:pointer}.mathlive-btn-cancel:hover{border-color:#888;color:#ccc}.mathlive-btn-insert{background:#4caf50;color:#fff;border:none;padding:8px 20px;border-radius:4px;font-size:13px;font-weight:600;cursor:pointer}.mathlive-btn-insert:hover{background:#43a047}.collaborator-avatars{display:flex;gap:4px;align-items:center;margin-right:8px}.collaborator-avatar{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:11px;font-weight:600;cursor:default}.share-dialog-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.share-dialog{background:#fff;border-radius:8px;width:440px;max-width:90vw;max-height:80vh;overflow-y:auto;padding:24px;box-shadow:0 4px 20px #0000004d}.share-dialog-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.share-dialog-header h3{margin:0;color:var(--text-dark)}.share-dialog-close{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-muted)}.share-invite-form{display:flex;gap:8px;margin-bottom:16px}.share-invite-form input[type=email]{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px}.share-invite-form select{padding:8px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px}.share-error{color:var(--danger);font-size:13px;margin-bottom:12px}.share-section{margin-top:16px}.share-section h4{color:var(--text-dark);margin-bottom:8px;font-size:14px}.share-member{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid #f0f0f0}.share-member-id{flex:1;font-size:13px;color:var(--text-dark);overflow:hidden;text-overflow:ellipsis}.share-member-role{font-size:12px;color:var(--text-muted);text-transform:capitalize}.invitations-section{margin-bottom:24px}.invitations-section h3{margin-bottom:12px}.invitation-card{display:flex;align-items:center;justify-content:space-between;background:#fff;padding:12px 16px;border-radius:var(--radius);border:1px solid var(--border);margin-bottom:8px;gap:12px}.invitation-card span{font-size:14px}.invitation-actions{display:flex;gap:8px;flex-shrink:0}.project-role{font-size:11px;color:var(--accent);text-transform:capitalize;font-weight:600}.project-card-shared{border-left:3px solid var(--accent)}.project-card-deleted{opacity:.5;border-left:3px solid var(--text-muted)}.project-card-deleted:hover{opacity:.8}.save-indicator.synced{color:var(--accent)}.save-indicator.saved{color:#4caf50;font-weight:600;animation:none}.share-banner{display:flex;align-items:center;justify-content:center;gap:16px;padding:14px 24px;background:#1a1a1a;color:#fff;position:sticky;bottom:0;z-index:100}.share-banner-text{font-size:14px;opacity:.9}.btn-share-banner{background:#2979ff;color:#fff;padding:8px 20px;font-weight:600;border-radius:var(--radius);font-size:14px}.btn-share-banner:hover{background:#1565c0}.invite-page-content{flex:1;padding:40px 32px;max-width:600px;margin:0 auto;width:100%}.invite-page-content h2{font-size:22px;margin-bottom:8px}.invite-subtitle{color:var(--text-muted);font-size:14px;margin-bottom:24px;line-height:1.5}.invite-form{display:flex;flex-direction:column;gap:12px}.invite-textarea{width:100%;padding:12px;border:1px solid var(--border);border-radius:var(--radius);font-family:inherit;font-size:14px;resize:vertical;line-height:1.5}.invite-textarea:focus{outline:none;border-color:#2979ff;box-shadow:0 0 0 2px #2979ff26}.btn-invite-send{background:#2979ff;color:#fff;padding:10px 24px;font-size:15px;font-weight:600;border-radius:var(--radius);align-self:flex-start}.btn-invite-send:hover:not(:disabled){background:#1565c0}.btn-invite-send:disabled{opacity:.5;cursor:not-allowed}.invite-results{margin-top:20px}.invite-result-success{background:#e8f5e9;border-radius:var(--radius);padding:12px 16px;margin-bottom:8px;font-size:14px}.invite-result-success ul{margin:4px 0 0 20px}.invite-result-warning{background:#fff3e0;border-radius:var(--radius);padding:12px 16px;margin-bottom:8px;font-size:14px;color:#e65100}.invite-result-warning ul{margin:4px 0 0 20px}.invite-result-error{background:#ffebee;border-radius:var(--radius);padding:12px 16px;margin-bottom:8px;font-size:14px;color:var(--danger)}.invite-result-error ul{margin:4px 0 0 20px}.invite-result-skip{color:var(--text-muted);font-size:13px;font-style:italic}.cm-ySelectionInfo{font-size:11px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;padding:1px 4px;border-radius:3px;color:#fff;opacity:.9}