.tool-pdf-splitter .tool-container {display: flex; flex-direction: column; gap: var(--spacing-xl); margin-bottom: var(--spacing-xl);}
.tool-pdf-splitter .panel {background: var(--bg-surface); border: 2px solid var(--border); border-radius: var(--radius-md); overflow: hidden;}
.tool-pdf-splitter .panel.hidden {display: none;}
.tool-pdf-splitter .panel-header {padding: var(--spacing-md); background: var(--bg-light); border-bottom: 2px solid var(--border);}
.tool-pdf-splitter .panel-title {font-weight: 700; color: var(--text-dark); font-size: 0.9rem; text-transform: uppercase;}
.tool-pdf-splitter .panel-content {padding: var(--spacing-lg);}
.tool-pdf-splitter .upload-area {border: 2px dashed var(--border); border-radius: var(--radius-md); padding: var(--spacing-xl); text-align: center; cursor: pointer; transition: all var(--transition-base);}
.tool-pdf-splitter .upload-area:hover {border-color: var(--primary); background: var(--bg-light);}
.tool-pdf-splitter .upload-icon {font-size: 4rem; margin-bottom: var(--spacing-md);}
.tool-pdf-splitter .upload-text {font-weight: 600; color: var(--text-dark); margin-bottom: var(--spacing-xs);}
.tool-pdf-splitter .upload-hint {font-size: 0.85rem; color: var(--text-muted);}
.tool-pdf-splitter .file-info {margin-top: var(--spacing-md); padding: var(--spacing-md); background: var(--bg-light); border-radius: var(--radius-sm);}
.tool-pdf-splitter .file-info.hidden {display: none;}
.tool-pdf-splitter .page-selection {margin-bottom: var(--spacing-lg);}
.tool-pdf-splitter .page-selection label {display: block; font-weight: 600; margin-bottom: var(--spacing-sm);}
.tool-pdf-splitter .page-selection input {width: 100%; padding: var(--spacing-md); border: 2px solid var(--border); border-radius: var(--radius-sm); margin-bottom: var(--spacing-sm);}
.tool-pdf-splitter .pages-preview {display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: var(--spacing-sm); margin-bottom: var(--spacing-lg);}
.tool-pdf-splitter .page-thumb {border: 2px solid var(--border); border-radius: var(--radius-sm); padding: var(--spacing-xs); text-align: center; cursor: pointer; transition: all var(--transition-base);}
.tool-pdf-splitter .page-thumb:hover {border-color: var(--primary); transform: scale(1.05);}
.tool-pdf-splitter .page-thumb.selected {border-color: var(--success); background: rgba(16, 185, 129, 0.1);}
.tool-pdf-splitter .page-thumb canvas {width: 100%; height: auto; border-radius: var(--radius-sm);}
.tool-pdf-splitter .page-number {font-size: 0.75rem; font-weight: 600; margin-top: var(--spacing-xs);}