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.block{border-left-color:#e8e8e8}.content-block[data-block-type=section][data-has-children=true] .block-content:before{content:"▼";display:inline-block;margin-right:8px;font-size:.8em;color:#06c;transition:transform .2s ease-out}.content-block[data-block-type=section][data-collapsed=true] .block-content:before{transform:rotate(-90deg)}.content-block--nested[data-block-type=section]:before{background:linear-gradient(to bottom,rgba(0,102,204,.2) 0%,rgba(0,102,204,.2) 50%,transparent 50%,transparent 100%)}.content-block--nested[data-block-type=text]:before{background:linear-gradient(to bottom,rgba(128,128,128,.15) 0%,rgba(128,128,128,.15) 50%,transparent 50%,transparent 100%)}.section-children-indicator{position:absolute;top:8px;right:45px;background:linear-gradient(135deg,#06c,#0052a3);color:#fff;border-radius:12px;padding:2px 8px;font-size:11px;font-weight:600;line-height:16px;box-shadow:0 1px 3px #0066cc4d;pointer-events:none;z-index:2;opacity:0;transition:opacity .2s 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var(--success-green-border);animation:pulse-valid 1.5s ease-in-out infinite}.drop-indicator--invalid{background-color:var(--error-red);height:3px;box-shadow:0 0 8px var(--error-red-border);animation:shake-invalid .3s ease-in-out}@keyframes pulse-valid{0%,to{opacity:1;box-shadow:0 0 8px var(--success-green-border)}50%{opacity:.8;box-shadow:0 0 12px var(--success-green-border)}}@keyframes shake-invalid{0%,to{transform:translate(0)}25%{transform:translate(-2px)}75%{transform:translate(2px)}}@keyframes slide-in{0%{opacity:0;transform:scaleX(.5)}to{opacity:1;transform:scaleX(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}.drop-indicator--slide-in{animation:slide-in .2s ease-out}.drop-indicator--pulse{animation:pulse 1.5s ease-in-out infinite}.content-block--dragging{opacity:.5;cursor:grabbing}.content-block--drag-over{background-color:var(--drop-indicator-blue-light);border-color:var(--drop-indicator-blue-border)}.content-block--drag-over-valid{background-color:var(--success-green-light);border-color:var(--success-green-border)}.content-block--drag-over-invalid{background-color:var(--error-red-light);border-color:var(--error-red-border);cursor:not-allowed}.drag-ghost-preview{position:fixed;pointer-events:none;z-index:9999;opacity:.6;background-color:#fff;border:2px solid rgba(59,130,246,.5);border-radius:4px;padding:12px;box-shadow:0 4px 12px #00000026;font-size:14px;line-height:1.5;color:#333;transform:translateZ(0);will-change:transform;backface-visibility:hidden;transition:opacity .2s ease-out}.drag-ghost-preview--active{opacity:.6}.drag-ghost-preview--fading{opacity:0;transition:opacity .2s ease-in}.drag-ghost-preview__content{max-width:300px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.drag-ghost-preview__count{margin-top:4px;font-size:12px;color:#666;font-weight:500}.depth-guide{position:fixed;top:0;bottom:0;width:2px;border-left-width:2px;border-left-style:solid;transition:left .15s ease-out,border-left-color .15s ease-out;pointer-events:none;z-index:9998;transform:translateZ(0);will-change:transform;backface-visibility:hidden}.depth-guide--valid{border-left-color:#3b82f6}.depth-guide--invalid{border-left-color:#ef4444}.depth-guide--hidden{opacity:0;visibility:hidden;transition:opacity .15s ease-out,visibility 0s .15s}.depth-guide--depth-0{left:0}.depth-guide--depth-1{left:24px}.depth-guide--depth-2{left:48px}.depth-guide--depth-3{left:72px}.depth-guide--depth-4{left:96px}.drag-visual-optimized{transform:translateZ(0);will-change:transform,opacity;backface-visibility:hidden;contain:layout style paint}.drag-container-optimized{isolation:isolate;contain:layout style}.image-size-warning{display:flex;align-items:center;padding:12px 16px;border-radius:4px;margin-bottom:16px;border-left:4px solid;background-color:var(--color-warning-bg, #fff3cd);border-color:var(--color-warning-border, #ffc107);box-shadow:0 2px 4px #0000001a}.image-size-warning.strong-warning{background-color:var(--color-danger-bg, #f8d7da);border-color:var(--color-danger-border, #dc3545)}.warning-content{display:flex;align-items:center;gap:12px;width:100%}.warning-icon{flex-shrink:0;font-size:20px;line-height:1}.warning-message{flex:1;min-width:0}.warning-message p{margin:0;font-size:14px;line-height:1.5;color:var(--color-text-primary, #333)}.compress-hint{margin-top:4px!important;font-size:13px!important;opacity:.9;font-style:italic}.warning-actions{display:flex;gap:8px;flex-shrink:0}.warning-actions button{padding:6px 12px;border:none;border-radius:4px;font-size:14px;font-weight:500;cursor:pointer;transition:background-color .2s ease,transform .1s ease}.warning-actions button:hover{transform:translateY(-1px)}.warning-actions button:active{transform:translateY(0)}.warning-actions button:focus{outline:2px solid var(--color-focus, #007bff);outline-offset:2px}.btn-proceed{background-color:var(--color-primary, #007bff);color:#fff}.btn-proceed:hover{background-color:var(--color-primary-hover, #0056b3)}.btn-cancel{background-color:var(--color-secondary, #6c757d);color:#fff}.btn-cancel:hover{background-color:var(--color-secondary-hover, #545b62)}.btn-compress{background-color:var(--color-success, #28a745);color:#fff}.btn-compress:hover{background-color:var(--color-success-hover, #218838)}.btn-compress:disabled{background-color:#6c757d;cursor:not-allowed;opacity:.6}.warning-actions button:disabled{cursor:not-allowed;opacity:.6}.image-size-warning.strong-warning .btn-proceed{background-color:var(--color-danger, #dc3545)}.image-size-warning.strong-warning .btn-proceed:hover{background-color:var(--color-danger-hover, #c82333)}@media(max-width:640px){.warning-content{flex-direction:column;align-items:flex-start;gap:8px}.warning-actions{width:100%}.warning-actions button{flex:1}}@media(prefers-color-scheme:dark){.image-size-warning{background-color:var(--color-warning-bg-dark, #664d03);border-color:var(--color-warning-border-dark, #997404)}.image-size-warning.strong-warning{background-color:var(--color-danger-bg-dark, #842029);border-color:var(--color-danger-border-dark, #a52834)}.warning-message p{color:var(--color-text-primary-dark, #f8f9fa)}}.command-palette-backdrop{position:fixed;inset:0;background-color:#00000080;z-index:9999;display:flex;align-items:flex-start;justify-content:center;padding-top:15vh;animation:fadeIn .15s ease-out}.command-palette-modal{background:var(--background-color, #ffffff);border-radius:8px;box-shadow:0 16px 48px #0000004d;width:90%;max-width:600px;max-height:70vh;display:flex;flex-direction:column;animation:slideDown .2s ease-out}.command-palette-search{padding:16px;border-bottom:1px solid var(--border-color, #e0e0e0)}.command-palette-input{width:100%;padding:12px 16px;font-size:16px;border:1px solid var(--border-color, #e0e0e0);border-radius:6px;outline:none;transition:border-color .2s}.command-palette-input:focus{border-color:var(--primary-color, #0066cc)}.command-palette-results{list-style:none;margin:0;padding:8px 0;overflow-y:auto;max-height:calc(70vh - 80px)}.command-palette-item{padding:12px 16px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background-color .15s}.command-palette-item:hover{background-color:var(--hover-background, #f5f5f5)}.command-palette-item[aria-selected=true]{background-color:var(--selected-background, #e3f2fd)}.command-palette-item-label{flex:1;font-size:14px;color:var(--text-color, #333333)}.command-palette-item-shortcut{margin-left:16px;padding:4px 8px;font-size:12px;font-family:monospace;color:var(--secondary-text, #666666);background-color:var(--shortcut-background, #f0f0f0);border-radius:4px}.command-palette-empty{padding:32px 16px;text-align:center;color:var(--secondary-text, #666666);font-size:14px}@media(max-width:768px){.command-palette-backdrop{padding-top:10vh}.command-palette-modal{width:95%;max-height:80vh}.command-palette-input{font-size:16px}}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@media(prefers-color-scheme:dark){.command-palette-modal{--background-color: #1e1e1e;--border-color: #3d3d3d;--text-color: #e0e0e0;--secondary-text: #a0a0a0;--hover-background: #2d2d2d;--selected-background: #264f78;--shortcut-background: #2d2d2d}}.math-block{position:relative;padding:12px;margin:8px 0;border:2px solid transparent;border-radius:4px;background-color:#f8f9fa;cursor:pointer;transition:all .2s 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