/* DocGen - PDF Split & Merge Tool */
/* Clean, minimal design inspired by PDFsam 2.2.4 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 14px;
    color: #333;
    background: #f5f5f5;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    user-select: none;
}

/* ========================================
   Toolbar
   ======================================== */
#toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: #fff;
    border-bottom: 1px solid #ddd;
    flex-shrink: 0;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    font-size: 13px;
    color: #333;
    transition: all 0.15s ease;
}

.toolbar-btn:hover {
    background: #f0f0f0;
    border-color: #999;
}

.toolbar-btn:active {
    background: #e5e5e5;
}

.toolbar-btn.primary {
    background: #0066cc;
    border-color: #0055aa;
    color: #fff;
}

.toolbar-btn.primary:hover {
    background: #0055aa;
}

.toolbar-btn.primary:disabled {
    background: #999;
    border-color: #888;
    cursor: not-allowed;
}

.btn-icon {
    font-weight: bold;
    font-size: 16px;
}

.toolbar-spacer {
    flex: 1;
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background: #ddd;
    margin: 0 4px;
}

#page-count {
    color: #666;
    font-size: 13px;
    padding: 0 12px;
}

/* ========================================
   Main Content - Two Panel Layout
   ======================================== */
#main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.panel {
    display: flex;
    flex-direction: column;
    background: #fff;
    overflow: hidden;
}

#source-panel {
    flex: 1;
    border-right: 1px solid #ddd;
}

#assembly-panel {
    flex: 1;
    background: #fafafa;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: #f8f8f8;
    border-bottom: 1px solid #eee;
    flex-shrink: 0;
}

.panel-header h2 {
    font-size: 14px;
    font-weight: 600;
    color: #444;
}

.count-badge {
    background: #e0e0e0;
    color: #666;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 10px;
}

#assembly-panel .count-badge {
    background: #0066cc;
    color: #fff;
}

.add-selected-btn {
    margin-left: auto;
    padding: 4px 12px;
    font-size: 12px;
    background: #0066cc;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

.add-selected-btn:hover {
    background: #0055aa;
}

.add-selected-btn:disabled {
    background: #999;
    cursor: not-allowed;
}

.clear-assembly-btn {
    margin-left: 8px;
    padding: 4px 12px;
    font-size: 12px;
    background: #dc3545;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

.clear-assembly-btn:hover {
    background: #c82333;
}

.preview-all-btn {
    margin-left: 8px;
    padding: 4px 12px;
    font-size: 12px;
    background: #666;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

.preview-all-btn:hover {
    background: #555;
}

.preview-all-btn:disabled {
    background: #999;
    cursor: not-allowed;
}

/* ========================================
   Document Tree View
   ======================================== */
.tree-view {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

/* Document Tree Item */
.doc-tree-item {
    margin-bottom: 4px;
}

/* Document Header Row */
.doc-header {
    display: flex;
    align-items: center;
    padding: 6px 8px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
}

.doc-header:hover {
    background: #e8e8e8;
}

.doc-toggle {
    width: 16px;
    font-size: 10px;
    color: #666;
    margin-right: 6px;
    flex-shrink: 0;
}

.doc-checkbox {
    margin-right: 8px;
    width: 16px;
    height: 16px;
    cursor: pointer;
    flex-shrink: 0;
}

.doc-name {
    font-weight: 600;
    font-size: 13px;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.doc-page-count {
    font-size: 11px;
    color: #888;
    margin-left: 8px;
}

.doc-preview-btn {
    margin-left: auto;
    padding: 4px 10px;
    font-size: 11px;
    background: #666;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

.doc-preview-btn:hover {
    background: #555;
}

/* Page List under document */
.page-list {
    margin-left: 24px;
    border-left: 1px solid #ddd;
    padding-left: 8px;
    margin-top: 2px;
}

.page-list.collapsed {
    display: none;
}

.page-item {
    display: flex;
    align-items: center;
    padding: 4px 8px;
    border-radius: 3px;
    cursor: pointer;
}

.page-item:hover {
    background: #f0f0f0;
}

.page-checkbox {
    margin-right: 8px;
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.page-label {
    font-size: 12px;
    color: #444;
    flex: 1;
}

.page-preview-btn {
    font-size: 10px;
    color: #0066cc;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    opacity: 0;
    transition: opacity 0.15s;
}

.page-item:hover .page-preview-btn {
    opacity: 1;
}

.page-preview-btn:hover {
    background: #e6f0ff;
}

/* Assembly list (right panel) */
.assembly-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.assembly-item {
    display: flex;
    align-items: center;
    padding: 8px 10px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 4px;
    cursor: grab;
}

.assembly-item:hover {
    border-color: #0066cc;
    background: #fafafa;
}

.assembly-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.assembly-number {
    width: 24px;
    height: 24px;
    background: #0066cc;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
    margin-right: 10px;
    flex-shrink: 0;
}

.assembly-label {
    font-size: 13px;
    color: #333;
    flex: 1;
}

.assembly-preview {
    font-size: 11px;
    color: #0066cc;
    cursor: pointer;
    padding: 4px 8px;
    margin-right: 8px;
    border-radius: 3px;
}

.assembly-preview:hover {
    background: #e6f0ff;
}

.assembly-remove {
    font-size: 16px;
    color: #999;
    cursor: pointer;
    padding: 2px 6px;
}

.assembly-remove:hover {
    color: #cc0000;
}

/* Page range input */
.page-range-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    background: #f8f8f8;
    border-radius: 4px;
    margin-top: 4px;
    margin-left: 24px;
}

.page-range-input {
    width: 120px;
    padding: 4px 8px;
    border: 1px solid #ccc;
    border-radius: 3px;
    font-size: 12px;
}

.page-range-btn {
    padding: 4px 10px;
    font-size: 11px;
    background: #0066cc;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

.page-range-btn:hover {
    background: #0055aa;
}

.page-range-hint {
    font-size: 11px;
    color: #888;
}

/* ========================================
   Drop Zone
   ======================================== */
.drop-zone {
    width: 100%;
    min-height: 200px;
    border: 2px dashed #ccc;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fafafa;
    transition: all 0.2s ease;
}

.drop-zone.drag-over {
    border-color: #0066cc;
    background: #e6f0ff;
}

.drop-zone-content {
    text-align: center;
    color: #888;
}

.drop-icon {
    font-size: 48px;
    color: #ccc;
    margin-bottom: 12px;
}

.drop-zone-content p {
    margin: 4px 0;
}

.drop-hint {
    font-size: 12px;
    color: #aaa;
}

/* Empty state for assembly panel */
.empty-state {
    width: 100%;
    min-height: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #888;
    text-align: center;
}

.empty-state p {
    margin: 4px 0;
}

/* ========================================
   Resize Handle
   ======================================== */
#resize-handle {
    width: 5px;
    background: #ddd;
    cursor: col-resize;
    flex-shrink: 0;
}

#resize-handle:hover {
    background: #0066cc;
}

/* ========================================
   Status Bar
   ======================================== */
#status-bar {
    padding: 6px 12px;
    background: #f0f0f0;
    border-top: 1px solid #ddd;
    font-size: 12px;
    color: #666;
    flex-shrink: 0;
}

/* ========================================
   SortableJS Styles
   ======================================== */
.sortable-ghost {
    opacity: 0.4;
}

.sortable-chosen {
    border-color: #0066cc !important;
}

.sortable-drag {
    opacity: 1 !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* ========================================
   Loading Spinner
   ======================================== */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #e0e0e0;
    border-top: 3px solid #0066cc;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ========================================
   Scrollbar Styling
   ======================================== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f0f0f0;
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #999;
}