/**
 * PERT Diagram Module Styles
 * Phase 1: Layout and Filter Accordion styles
 * Matches Progress Matrix design exactly
 */

/* ============================================
   Container - COLUMN layout (top to bottom)
   ============================================ */
#pert-diagram-container,
.pert-diagram-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    background: #fff;
    position: relative;
}

/* ============================================
   Header Section (like Progress Matrix)
   ============================================ */
.pert-diagram-header,
#pert-diagram-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 15px;
    border-bottom: 1px solid #e0e0e0;
    background: #fafafa;
}

.pert-diagram-title {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: #333;
}

.pert-diagram-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Phase 2: Zoom Controls - Fixed Bottom Right */
.pert-zoom-controls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
    background: white;
    padding: 8px 12px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    z-index: 100;
}

.pert-zoom-label {
    font-size: 12px;
    font-weight: 500;
    color: #666;
    min-width: 36px;
    text-align: center;
}

.pert-zoom-btn {
    width: 28px;
    height: 28px;
    border: 1px solid #d9d9d9;
    background: white;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.pert-zoom-btn:hover {
    background: #f0f0f0;
    border-color: #1890ff;
    color: #1890ff;
}

.pert-zoom-btn:active {
    background: #e6e6e6;
}

/* ============================================
   Filter Section - Accordion Style
   (Matches Progress Matrix exactly)
   ============================================ */
.pert-diagram-filter,
#pert-diagram-filter {
    border-bottom: 1px solid #e0e0e0;
}

/* Accordion Toggle Header */
.pert-diagram-filter .filter-toggle,
#pert-diagram-filter .filter-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    background: #f8f9fa;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

.pert-diagram-filter .filter-toggle:hover {
    background: #f0f0f0;
}

.filter-toggle-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-toggle-icon {
    font-size: 10px;
    color: #4a90d9;
    transition: transform 0.2s;
    width: 16px;
}

.filter-toggle.collapsed .filter-toggle-icon {
    transform: rotate(-90deg);
}

.filter-toggle-label {
    font-weight: 600;
    font-size: 13px;
    color: #333;
}

.filter-toggle-summary {
    font-size: 12px;
    color: #888;
}

.filter-toggle-hint {
    font-size: 12px;
    color: #4a90d9;
}

/* Accordion Content */
.pert-diagram-filter .filter-content,
#pert-diagram-filter .filter-content {
    padding: 15px 20px;
    background: #f8f9fa;
    border-top: 1px solid #e8e8e8;
}

.filter-content.hidden {
    display: none;
}

/* Filter Header Row (inside accordion) */
.pert-diagram-filter .filter-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.filter-label {
    font-weight: 600;
    color: #333;
    font-size: 13px;
    white-space: nowrap;
}

/* Filter action buttons */
.pert-diagram-filter .filter-actions {
    display: flex;
    gap: 8px;
}

.pert-diagram-filter .filter-actions button {
    padding: 6px 12px;
    border: 1px solid #d9d9d9;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.pert-diagram-filter .filter-actions button:hover {
    background: #f0f0f0;
    border-color: #1890ff;
}

.pert-diagram-filter .filter-actions button:disabled {
    background: #f5f5f5;
    color: #d9d9d9;
    cursor: not-allowed;
    border-color: #e8e8e8;
}

/* WBS Tree Container */
.pert-diagram-filter .wbs-tree-container,
#pert-wbs-tree {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    max-height: 265px;
    overflow-y: auto;
    padding: 10px;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
}

/* No roots selected message */
.no-roots-message {
    padding: 20px;
    text-align: center;
    color: #888;
    font-size: 13px;
    background: #f9f9f9;
    border: 1px dashed #d9d9d9;
    border-radius: 4px;
    width: 100%;
}

/* Filter Presets Row */
.filter-presets-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.filter-select-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-select-wrapper label {
    font-size: 12px;
    color: #666;
}

.filter-select-wrapper select {
    padding: 6px 10px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 12px;
    min-width: 150px;
    cursor: pointer;
}

.filter-select-wrapper select:focus {
    border-color: #1890ff;
    outline: none;
}

.filter-select-wrapper select:disabled {
    background: #f5f5f5;
    cursor: not-allowed;
}

/* ============================================
   Diagram Content Area
   ============================================ */
.pert-diagram-content,
#pert-diagram-content {
    flex: 1;
    position: relative;
    overflow: auto;
    background: #fafafa;
}

/* Placeholder (Phase 1) */
.pert-diagram-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #666;
    text-align: center;
    padding: 40px;
}

.pert-diagram-placeholder h2 {
    margin: 0 0 8px 0;
    font-size: 20px;
    font-weight: 600;
    color: #333;
}

.pert-diagram-placeholder p {
    margin: 0 0 16px 0;
    font-size: 14px;
}

/* Canvas Container (holds DHTMLX diagram) */
.pert-diagram-canvas-container,
#pert-diagram-canvas-container {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

/* Status box */
.pert-status-box {
    border-radius: 8px;
    padding: 16px 24px;
    font-size: 13px;
}

.pert-status-box.success {
    background: #e8f5e9;
    border: 1px solid #c8e6c9;
    color: #2e7d32;
}

.pert-status-box span {
    font-size: 12px;
    opacity: 0.8;
}

/* ============================================
   Phase 2: Diagram Canvas
   ============================================ */
.pert-diagram-canvas {
    width: 100%;
    height: 100%;
    min-height: 400px;
}

/* ============================================
   Phase 2: Task Card Styles
   Reference: PERT_DIAGRAM_IMPLEMENTATION_PLAN.md Section 8.3
   ============================================ */
.pert-diagram-task-card {
    border-radius: 6px;
    padding: 8px 12px;
    font-family: var(--dhx-font-family, 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif);
    font-size: 12px;
    color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    box-sizing: border-box;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    transition: box-shadow 0.2s, transform 0.1s;
}

.pert-diagram-task-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25);
    transform: translateY(-1px);
}

.pert-task-name {
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.pert-task-details {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
    font-size: 11px;
    opacity: 0.9;
}

.pert-task-code {
    font-family: 'Consolas', 'Monaco', monospace;
    letter-spacing: 0.5px;
}

.pert-task-duration {
    font-weight: 500;
}

.pert-task-dates {
    display: flex;
    justify-content: center;
    gap: 8px;
    font-size: 10px;
    opacity: 0.85;
}

.pert-task-arrow {
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   Phase 2: Milestone Styles
   ============================================ */
.pert-diagram-milestone {
    border-radius: 6px;
    padding: 8px 12px;
    font-family: var(--dhx-font-family, 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif);
    font-size: 12px;
    color: #333;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    box-sizing: border-box;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: box-shadow 0.2s;
}

.pert-diagram-milestone:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25);
}

.pert-milestone-name {
    font-weight: 600;
    font-size: 12px;
    text-align: center;
    margin-bottom: 4px;
}

.pert-milestone-date {
    font-size: 10px;
    opacity: 0.8;
}

/* ============================================
   Phase 2: Dependency Line Styles
   ============================================ */
.dhx_diagram_line {
    stroke: #666;
    stroke-width: 1.5px;
}

.dhx_diagram_line:hover {
    stroke: #0288D1;
    stroke-width: 2px;
}

.dhx_diagram_arrow {
    fill: #666;
}

/* ============================================
   Phase 3: Data Source Toggle Styles
   ============================================ */
.data-source-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}

.data-source-btn,
.refresh-btn {
    padding: 6px 12px;
    border: 1px solid #d9d9d9;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.data-source-btn:hover,
.refresh-btn:hover {
    background: #f0f0f0;
    border-color: #1890ff;
}

.data-source-btn.active {
    background: #1890ff;
    color: white;
    border-color: #1890ff;
}

.refresh-btn {
    background: #52c41a;
    color: white;
    border-color: #52c41a;
}

.refresh-btn:hover {
    background: #73d13d;
    border-color: #73d13d;
}

/* ============================================
   Layout Engine Toggle Buttons
   ============================================ */

.layout-engine-btn {
    padding: 4px 10px;
    border: 1px solid #d9d9d9;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    transition: all 0.2s;
    color: #666;
}

.layout-engine-btn:hover {
    background: #f0f0f0;
    border-color: #1890ff;
    color: #1890ff;
}

.layout-engine-btn.active {
    background: #1890ff;
    color: white;
    border-color: #1890ff;
}

.layout-engine-btn.active:hover {
    background: #40a9ff;
}

/* ============================================
   Phase 4: WBS Filter Panel Tree Styles
   ============================================ */

/* REMOVED: Old override that broke flexbox layout
   The filter-tree-container now uses flexbox wrap for card grid
   See styles at bottom of file for .filter-tree-container
*/

/* WBS Group */
.wbs-group {
    margin-bottom: 2px;
}

.wbs-group[data-level="2"] {
    margin-left: 20px;
}

.wbs-group[data-level="3"] {
    margin-left: 40px;
}

.wbs-group[data-level="4"] {
    margin-left: 60px;
}

/* WBS Group Header */
.wbs-group-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s;
    user-select: none;
}

.wbs-group-header:hover {
    background: #f0f0f0;
}

.wbs-group-header.selected {
    background: #e6f7ff;
}

/* Chevron */
.wbs-chevron {
    font-size: 10px;
    color: #666;
    width: 14px;
    text-align: center;
    transition: transform 0.2s;
    flex-shrink: 0;
}

.wbs-chevron-placeholder {
    width: 14px;
    flex-shrink: 0;
}

/* Checkbox */
.wbs-checkbox {
    width: 14px;
    height: 14px;
    cursor: pointer;
    flex-shrink: 0;
    accent-color: #1890ff;
}

/* WBS Name */
.wbs-name {
    flex: 1;
    font-size: 12px;
    color: #333;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* WBS Count */
.wbs-count {
    font-size: 11px;
    color: #888;
    flex-shrink: 0;
}

.wbs-count.none {
    color: #999;
}

.wbs-count.partial {
    color: #fa8c16;
}

.wbs-count.all {
    color: #52c41a;
}

/* WBS Children Container */
.wbs-children {
    margin-top: 2px;
}

.wbs-children.hidden {
    display: none;
}

/* Filter Apply Row */
.filter-apply-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #e0e0e0;
}

.filter-summary {
    font-size: 12px;
    color: #666;
}

.apply-btn {
    padding: 8px 20px;
    background: #1890ff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background 0.2s;
}

.apply-btn:hover {
    background: #40a9ff;
}

.apply-btn:active {
    background: #096dd9;
}

/* Filter button styles */
.filter-btn {
    padding: 5px 10px;
    border: 1px solid #d9d9d9;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    transition: all 0.2s;
}

.filter-btn:hover {
    background: #f0f0f0;
    border-color: #1890ff;
}

/* ============================================
   Phase 6: WBS Group Headers in PERT Diagram
   ============================================ */
.pert-diagram-group-header {
    padding: 8px 16px;
    font-weight: 600;
    font-size: 14px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    user-select: none;
    transition: opacity 0.2s;
}

.pert-diagram-group-header:hover {
    opacity: 0.9;
}

.pert-diagram-group-header .expand-icon {
    font-size: 10px;
    transition: transform 0.2s;
}

.pert-diagram-group-header.collapsed .expand-icon {
    transform: rotate(-90deg);
}

/* Level-based colors (matching wbs-color-settings.js) */
.pert-diagram-group-header.level-0 { background: #22577A; color: #fff; }
.pert-diagram-group-header.level-1 { background: #38A3A5; color: #fff; }
.pert-diagram-group-header.level-2 { background: #57CC99; color: #fff; }
.pert-diagram-group-header.level-3 { background: #80ED99; color: #333; }
.pert-diagram-group-header.level-4 { background: #C7F9CC; color: #333; }

/* Task card level colors - text contrast adjustment */
.pert-diagram-task-card.level-3,
.pert-diagram-task-card.level-4 {
    color: #333;
}

.pert-diagram-task-card.level-3 .pert-task-arrow,
.pert-diagram-task-card.level-4 .pert-task-arrow {
    color: rgba(0, 0, 0, 0.5);
}

/* ============================================
   Phase 6: Enhanced Task Card Styles
   ============================================ */

/* Selected task highlight */
.pert-diagram-task-card.selected {
    box-shadow: 0 0 0 3px #1890ff, 0 4px 8px rgba(0, 0, 0, 0.25);
}

/* Critical path task highlight */
.pert-diagram-task-card.critical {
    box-shadow: 0 0 0 2px #ff4d4f, 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Milestone task style adjustment */
.pert-diagram-milestone.selected {
    box-shadow: 0 0 0 3px #1890ff, 0 4px 8px rgba(0, 0, 0, 0.25);
}

/* ============================================
   Phase 6: Enhanced Dependency Line Styles
   ============================================ */

/* Dependency line - hover state enhancement */
.dhx_diagram_line.highlighted {
    stroke: #1890ff;
    stroke-width: 2.5px;
}

/* Critical path dependency */
.dhx_diagram_line.critical {
    stroke: #ff4d4f;
    stroke-width: 2px;
}

/* Dependency arrow - hover state */
.dhx_diagram_arrow:hover {
    fill: #1890ff;
}

/* ============================================
   Phase 6: DHTMLX Diagram Container Polish
   ============================================ */

/* Override DHTMLX default styles for better appearance */
.dhx_diagram {
    background: #fafafa;
}

/* Selection box styling */
.dhx_diagram_selection {
    border: 2px dashed #1890ff;
    background: rgba(24, 144, 255, 0.05);
}

/* Connector point styling */
.dhx_connector {
    fill: #1890ff;
    stroke: #fff;
    stroke-width: 2px;
}

/* ============================================
   Phase 7: Zoom panel styles will be added
   ============================================ */

/* ============================================
   Progress Matrix-Style Filter Panel
   (New design matching Progress Matrix pattern)
   ============================================ */

/* Filter Panel Container */
.pert-filter-panel {
    border-bottom: 1px solid #e0e0e0;
    background: #fff;
}

/* Accordion Header */
.filter-accordion-header {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    background: #f5f7f9;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
    border-bottom: 1px solid #e8e8e8;
}

.filter-accordion-header:hover {
    background: #eef1f4;
}

.filter-accordion-header.collapsed {
    border-bottom: none;
}

.filter-toggle-icon {
    font-size: 11px;
    color: #4a90d9;
    width: 18px;
    flex-shrink: 0;
}

.filter-toggle-label {
    font-weight: 600;
    font-size: 13px;
    color: #333;
    margin-right: 8px;
}

.filter-toggle-summary {
    font-size: 12px;
    color: #666;
    flex: 1;
}

.filter-toggle-action {
    font-size: 11px;
    color: #4a90d9;
    margin-left: auto;
}

/* Accordion Content */
.filter-accordion-content {
    padding: 12px 15px;
    background: #fafbfc;
}

.filter-accordion-content.hidden {
    display: none;
}

/* Root Chips Row */
.filter-chips-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.filter-chips-label {
    font-size: 12px;
    font-weight: 600;
    color: #555;
    padding-top: 6px;
    white-space: nowrap;
}

.filter-chips-container {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    flex: 1;
}

/* Filter Chip (Root Group Button) */
.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    background: #e8ecf0;
    border: 1px solid #d0d5dc;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    color: #555;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.filter-chip:hover {
    background: #dce1e8;
    border-color: #1890ff;
}

.filter-chip.active {
    background: #1890ff;
    border-color: #1890ff;
    color: #fff;
}

.filter-chip.active:hover {
    background: #40a9ff;
}

/* Chip Count Badge */
.chip-count {
    font-size: 10px;
    padding: 1px 5px;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.1);
}

.filter-chip.active .chip-count {
    background: rgba(255, 255, 255, 0.25);
}

.chip-count.all {
    background: rgba(82, 196, 26, 0.2);
    color: #389e0d;
}

.filter-chip.active .chip-count.all {
    background: rgba(255, 255, 255, 0.3);
    color: #fff;
}

.chip-count.partial {
    background: rgba(250, 140, 22, 0.2);
    color: #d46b08;
}

.filter-chip.active .chip-count.partial {
    background: rgba(255, 255, 255, 0.3);
    color: #fff;
}

.chip-count.none {
    opacity: 0.6;
}

/* Filter Toolbar */
.filter-toolbar {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    margin-left: auto;
}

.filter-toolbar-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.filter-toolbar-btn {
    padding: 5px 10px;
    background: #fff;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 11px;
    color: #555;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-toolbar-btn:hover {
    background: #f0f5ff;
    border-color: #1890ff;
    color: #1890ff;
}

/* ============================================
   Filter Tree Container - Multi-Column Grid Layout
   (Progress Matrix style with flexbox wrap)
   CRITICAL: Use !important to override any conflicting styles
   ============================================ */
.filter-tree-container,
#pert-wbs-tree {
    display: flex !important;
    flex-wrap: wrap !important;
    flex-direction: row !important;
    align-items: flex-start !important;
    align-content: flex-start !important;
    gap: 15px !important;
    max-height: 265px;
    overflow-y: auto;
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 10px;
}

.filter-empty-message {
    width: 100%;
    padding: 20px;
    text-align: center;
    color: #999;
    font-size: 12px;
    font-style: italic;
}

/* ============================================
   WBS Group Card Styles (Progress Matrix style)
   Each card is a fixed-width box that flows horizontally
   ============================================ */
.wbs-group-card {
    min-width: 200px !important;
    max-width: 280px !important;
    width: auto;
    flex: 0 0 auto !important;
    display: block !important;
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* Card Header - shows group name */
.wbs-card-header {
    display: flex !important;
    align-items: center;
    padding: 8px 10px;
    background: #fafafa;
    border-bottom: 1px solid #e0e0e0;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
    gap: 8px;
}

.wbs-card-header:hover {
    background: #f0f0f0;
}

/* Light green highlight when group has selected items */
.wbs-card-header.has-selection {
    background: #f6ffed;
    border-color: #b7eb8f;
}

.wbs-card-header.has-selection:hover {
    background: #d9f7be;
}

.wbs-card-header.collapsed {
    border-bottom: none;
    border-radius: 4px;
}

/* Card Chevron */
.wbs-card-chevron {
    font-size: 10px;
    color: #666;
    transition: transform 0.2s;
    width: 14px;
    flex-shrink: 0;
}

.wbs-card-header.collapsed .wbs-card-chevron {
    transform: rotate(-90deg);
}

/* Card Name - the group title */
.wbs-card-name {
    font-weight: 600;
    font-size: 13px;
    color: #333;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Card Checkbox */
.wbs-card-checkbox {
    cursor: pointer;
    flex-shrink: 0;
    margin-left: 8px;
}

/* Card Count Badge */
.wbs-card-count {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    background: #52c41a;
    color: #fff;
    flex-shrink: 0;
    white-space: nowrap;
    margin-left: 8px;
}

.wbs-card-count.all {
    background: #52c41a;
    color: #fff;
}

.wbs-card-count.partial {
    background: #95de64;
    color: #fff;
}

.wbs-card-count.none {
    background: #d9d9d9;
    color: #999;
}

/* Card Items Container - expandable list */
.wbs-card-items {
    max-height: 150px;
    overflow-y: auto;
    background: #fafafa;
}

.wbs-card-items.hidden {
    display: none !important;
}

/* Individual Item in card */
.wbs-item {
    display: flex;
    align-items: center;
    padding: 6px 10px;
    cursor: pointer;
    transition: background 0.2s;
    border-bottom: 1px solid #f0f0f0;
    gap: 6px;
}

.wbs-item:last-child {
    border-bottom: none;
}

.wbs-item:hover {
    background: #e6f7ff;
}

.wbs-item-wrapper {
    /* Container for item + its children */
}

.wbs-item-chevron {
    font-size: 10px;
    color: #666;
    width: 14px;
    flex-shrink: 0;
}

.wbs-item-chevron.has-children {
    cursor: pointer;
    color: #1890ff;
}

.wbs-item-chevron.has-children:hover {
    color: #40a9ff;
}

.wbs-item-children {
    /* Nested children container */
}

.wbs-item-children.hidden {
    display: none;
}

.wbs-item input[type="checkbox"] {
    cursor: pointer;
    flex-shrink: 0;
}

.wbs-item-name {
    font-size: 12px;
    color: #333;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.wbs-item-count {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    background: #52c41a;
    color: #fff;
    flex-shrink: 0;
    white-space: nowrap;
}

.wbs-item-count.all {
    background: #52c41a;
}

.wbs-item-count.partial {
    background: #95de64;
}

.wbs-item-count.none {
    background: #d9d9d9;
    color: #999;
}

.wbs-item.checked {
    background: transparent;
}

.wbs-no-items {
    padding: 10px;
    text-align: center;
    color: #999;
    font-size: 11px;
    font-style: italic;
}

/* ============================================
   Legacy WBS Group Styles (Tree - deprecated)
   ============================================ */
.wbs-group[data-level="1"] {
    margin-left: 0;
    margin-bottom: 4px;
}

.wbs-group[data-level="1"] > .wbs-group-header {
    background: #f5f7f9;
    font-weight: 600;
}

/* WBS Count Badge (in tree - legacy) */
.wbs-count-badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    background: #f0f0f0;
    color: #666;
    margin-left: auto;
    flex-shrink: 0;
}

.wbs-count-badge.all {
    background: #e6fffb;
    color: #13c2c2;
}

.wbs-count-badge.partial {
    background: #fff7e6;
    color: #fa8c16;
}

.wbs-count-badge.none {
    background: #f5f5f5;
    color: #bfbfbf;
}

/* WBS Task Count (leaf nodes - legacy) */
.wbs-task-count {
    font-size: 10px;
    color: #999;
    margin-left: auto;
}

/* Chevron Spacer (for leaf nodes alignment - legacy) */
.wbs-chevron-spacer {
    width: 14px;
    flex-shrink: 0;
}

/* Filter Apply Button */
.filter-apply-btn {
    padding: 8px 20px;
    background: #52c41a;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.filter-apply-btn:hover {
    background: #73d13d;
}

.filter-apply-btn:active {
    background: #389e0d;
}

/* ============================================
   Compact View - Node Styles (Phase: Compact View)
   [MODIFIED] Reduced padding, enabled text wrapping
   ============================================ */
.pert-compact-node {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;           /* Changed from height to min-height for text wrap */
    min-width: 120px;
    width: fit-content;         /* Grow only as needed */
    max-width: 216px;           /* 180px + 20% = 216px max */
    padding: 0 6px;             /* Reduced horizontal padding only */
    background: #ffffff;
    border: 2px solid #9CA3AF;
    border-radius: 18px;        /* Original value */
    cursor: pointer;
    transition: box-shadow 0.15s ease, transform 0.1s ease;
    box-sizing: border-box;
    user-select: none;
    z-index: 10;
}

.pert-compact-node:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}

.pert-compact-node.selected {
    box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.4), 0 4px 12px rgba(0, 0, 0, 0.15);
}

.pert-compact-node.highlighted {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.5);
}

.pert-compact-node-text {
    font-size: 13px;            /* Original value */
    font-weight: 500;
    color: #333333;
    text-align: center;         /* Center text */
    line-height: 1.3;           /* Better line spacing for wrapped text */
    /* Limit to 2 lines max, truncate overflow */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* WBS Level Border Colors (matches existing wbsColors) */
.pert-compact-node[data-wbs-level="0"] { border-color: #22577A; }
.pert-compact-node[data-wbs-level="1"] { border-color: #38A3A5; }
.pert-compact-node[data-wbs-level="2"] { border-color: #57CC99; }
.pert-compact-node[data-wbs-level="3"] { border-color: #80ED99; }
.pert-compact-node[data-wbs-level="4"] { border-color: #C7F9CC; }

/* ============================================
   Compact View - Connector Styles (Phase: Compact View)
   Matches prototype: tests/pert-compact-view-prototype.html
   ============================================ */
.pert-compact-connector {
    pointer-events: auto;
    cursor: pointer;
}

.pert-compact-connector-line {
    fill: none;
    stroke: #9CA3AF;
    stroke-width: 1.5;
    transition: stroke 0.15s ease, stroke-width 0.15s ease;
}

.pert-compact-connector:hover .pert-compact-connector-line,
.pert-compact-connector.highlighted .pert-compact-connector-line {
    stroke: #3B82F6;
    stroke-width: 2.5;
}

.pert-compact-connector-arrow {
    fill: #9CA3AF;
    transition: fill 0.15s ease;
}

.pert-compact-connector:hover .pert-compact-connector-arrow,
.pert-compact-connector.highlighted .pert-compact-connector-arrow {
    fill: #3B82F6;
}

/* ============================================
   View Toggle Buttons (Phase 6: Compact View)
   [MODIFIED] Uses text labels instead of icons
   ============================================ */
.pert-view-toggle {
    display: flex;
    gap: 2px;
    padding: 3px;
    background: #f0f0f0;
    border-radius: 8px;
    margin-right: 12px;
}

.pert-view-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 12px;
    height: 28px;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    color: #666;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s;
    white-space: nowrap;
}

.pert-view-btn:hover {
    background: #e0e0e0;
    color: #333;
}

.pert-view-btn.active {
    background: #1890ff;
    color: #fff;
    box-shadow: 0 2px 4px rgba(24, 144, 255, 0.3);
}

/* ============================================
   Dimmed States (Focus Mode - Compact View)
   Makes unconnected tasks less visible to focus on dependency chain
   ============================================ */

/* Dimmed compact nodes - low opacity, greyed out but STILL CLICKABLE */
.pert-compact-node.dimmed {
    opacity: 0.25;
    filter: grayscale(50%);
    /* pointer-events kept enabled - user can click dimmed nodes to select them */
    transition: opacity 0.3s ease, filter 0.3s ease;
}

/* Dimmed compact connectors - very low opacity but STILL CLICKABLE */
.pert-compact-connector.dimmed {
    opacity: 0.15;
    /* pointer-events kept enabled - user can click dimmed connectors */
    transition: opacity 0.3s ease;
}

.pert-compact-connector.dimmed .pert-compact-connector-line {
    stroke: #d0d0d0 !important;
}

.pert-compact-connector.dimmed .pert-compact-connector-arrow {
    fill: #d0d0d0 !important;
}