/**
 * USPHS Policy Knowledge Graph CSS Integration
 * Professional styling that seamlessly integrates with existing design system
 *
 * Features:
 * - Seamless color palette integration using existing CSS custom properties
 * - Responsive design with mobile-first approach
 * - Accessibility-compliant interactions and focus states
 * - Performance-optimized animations and transitions
 * - Professional component styling matching existing interface
 *
 * @author Claude Code (Anthropic)
 * @version 1.0.0
 */

/* =============================================================================
   KNOWLEDGE GRAPH MAIN CONTAINER
   ============================================================================= */

.knowledge-graph-section {
    margin-top: 2rem;
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--neutral-200);
    transition: all 0.3s ease;
}

.knowledge-graph-section.collapsed {
    box-shadow: var(--shadow-md);
}

/* Graph Header */
.kg-header {
    background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-50) 100%);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.kg-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--neutral-800);
    letter-spacing: -0.025em;
}

.kg-header-subtitle {
    font-size: 0.875rem;
    color: var(--neutral-600);
    font-weight: 400;
    margin: 0.25rem 0 0 0;
}

/* Toggle Button */
.toggle-graph-btn {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-navy) 100%);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    min-width: 44px; /* Touch target minimum */
}

.toggle-graph-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.toggle-graph-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.toggle-graph-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.toggle-graph-btn svg {
    width: 1rem;
    height: 1rem;
    transition: transform 0.3s ease;
}

.toggle-graph-btn.expanded svg {
    transform: rotate(180deg);
}

/* =============================================================================
   GRAPH VISUALIZATION CONTAINER
   ============================================================================= */

.kg-container {
    position: relative;
    background: var(--white);
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease;
}

.kg-container.collapsed {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.kg-container.expanded {
    max-height: 2000px;
    opacity: 1;
}

/* Graph Canvas */
.kg-visualization {
    position: relative;
    width: 100%;
    height: 600px;
    min-height: 400px;
    background: linear-gradient(135deg, var(--neutral-50) 0%, rgba(59, 130, 246, 0.02) 100%);
    border-radius: 0;
    overflow: hidden;
}

.kg-visualization svg {
    width: 100%;
    height: 100%;
    display: block;
    background: transparent;
}

/* Graph Loading States */
.kg-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(2px);
}

.kg-loading-spinner {
    width: 3rem;
    height: 3rem;
    border: 3px solid var(--neutral-200);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: kg-spin 1s linear infinite;
    margin-bottom: 1rem;
}

.kg-loading-text {
    color: var(--neutral-600);
    font-size: 0.95rem;
    font-weight: 500;
}

@keyframes kg-spin {
    to { transform: rotate(360deg); }
}

/* Error States */
.kg-error {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--neutral-200);
    max-width: 480px;
    width: 90%;
    padding: 0;
    overflow: hidden;
}

.kg-error-icon-wrapper {
    text-align: center;
    padding: 2rem 2rem 1rem;
    background: linear-gradient(135deg, var(--neutral-50) 0%, var(--neutral-100) 100%);
    border-bottom: 1px solid var(--neutral-200);
}

.kg-error-icon {
    width: 3rem;
    height: 3rem;
    display: block;
    margin: 0 auto;
}

.kg-error-icon.kg-error-network {
    color: var(--primary-blue);
}

.kg-error-icon.kg-error-server {
    color: var(--warning);
}

.kg-error-icon.kg-error-permission {
    color: var(--error);
}

.kg-error-icon.kg-error-notfound {
    color: var(--neutral-500);
}

.kg-error-icon.kg-error-data {
    color: var(--accent-amber);
}

.kg-error-icon.kg-error-generic {
    color: var(--error);
}

.kg-error-content {
    padding: 1.5rem 2rem 2rem;
    text-align: left;
}

.kg-error-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--neutral-800);
    text-align: center;
}

.kg-error-message {
    font-size: 0.95rem;
    color: var(--neutral-700);
    line-height: 1.6;
    margin-bottom: 1rem;
    text-align: center;
}

.kg-error-suggestion {
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(59, 130, 246, 0.05) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin: 1rem 0;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--neutral-700);
}

.kg-error-suggestion strong {
    color: var(--primary-navy);
    font-weight: 600;
}

.kg-error-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.kg-retry-btn, .kg-collapse-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    min-height: 44px;
    box-shadow: var(--shadow-sm);
}

.kg-retry-btn {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-navy) 100%);
    color: var(--white);
}

.kg-retry-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.kg-retry-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.kg-retry-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.kg-collapse-btn {
    background: var(--white);
    color: var(--neutral-600);
    border: 1px solid var(--neutral-300);
}

.kg-collapse-btn:hover {
    background: var(--neutral-50);
    color: var(--neutral-800);
    border-color: var(--neutral-400);
}

.kg-collapse-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(107, 114, 128, 0.2);
}

.kg-error-details {
    margin-top: 1.5rem;
    border-top: 1px solid var(--neutral-200);
    padding-top: 1rem;
}

.kg-error-details summary {
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--neutral-600);
    padding: 0.5rem 0;
    user-select: none;
}

.kg-error-details summary:hover {
    color: var(--neutral-800);
}

.kg-error-details summary:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.kg-error-technical {
    background: var(--neutral-100);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-sm);
    padding: 0.875rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.75rem;
    color: var(--neutral-700);
    white-space: pre-wrap;
    word-break: break-word;
    margin-top: 0.5rem;
    max-height: 120px;
    overflow-y: auto;
}

/* Retry Progress States */
.kg-retry-progress {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--neutral-200);
    padding: 2rem;
    text-align: center;
    max-width: 320px;
    width: 90%;
}

.kg-retry-spinner {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
}

.kg-retry-spinner svg {
    color: var(--primary-blue);
}

.kg-retry-text {
    color: var(--neutral-700);
}

.kg-retry-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--neutral-800);
}

.kg-retry-message {
    font-size: 0.875rem;
    color: var(--neutral-600);
}

/* Initialization Error States */
.kg-init-error {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--error);
    padding: 2rem;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.kg-init-error-icon {
    margin-bottom: 1rem;
}

.kg-init-error-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--error);
    margin-bottom: 0.75rem;
}

.kg-init-error-message {
    font-size: 0.95rem;
    color: var(--neutral-700);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.kg-init-error-help {
    font-size: 0.875rem;
    color: var(--neutral-600);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    border-left: 3px solid var(--neutral-300);
}

/* =============================================================================
   CONTROL PANELS
   ============================================================================= */

.kg-controls-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: var(--neutral-50);
    border-top: 1px solid var(--neutral-200);
}

.kg-controls-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-start;
}

/* Control Panel Base */
.kg-control-panel {
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.2s ease;
}

.kg-control-panel:hover {
    box-shadow: var(--shadow-md);
}

.kg-control-panel-header {
    background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-50) 100%);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.kg-control-panel-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--neutral-800);
    margin: 0;
}

.kg-control-panel-toggle {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--neutral-500);
    transition: transform 0.3s ease;
}

.kg-control-panel.collapsed .kg-control-panel-toggle {
    transform: rotate(-90deg);
}

.kg-control-panel-content {
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.kg-control-panel.collapsed .kg-control-panel-content {
    max-height: 0;
    padding: 0 1.5rem;
    overflow: hidden;
    opacity: 0;
}

/* =============================================================================
   LAYOUT CONTROLS
   ============================================================================= */

.kg-layout-controls {
    flex: 1;
    min-width: 280px;
}

.kg-layout-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.kg-layout-btn {
    background: var(--white);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    cursor: pointer;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--neutral-700);
    transition: all 0.2s ease;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.kg-layout-btn:hover {
    border-color: var(--primary-blue);
    background: var(--primary-light);
    color: var(--primary-navy);
}

.kg-layout-btn.active {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-navy) 100%);
    border-color: var(--primary-blue);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.kg-layout-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.kg-layout-btn svg {
    width: 1rem;
    height: 1rem;
}

/* Force Controls */
.kg-force-controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.kg-control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.kg-control-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--neutral-700);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.kg-control-value {
    font-size: 0.8125rem;
    color: var(--neutral-500);
    font-weight: 400;
}

.kg-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--neutral-200);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    transition: background 0.2s ease;
}

.kg-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-blue);
    cursor: pointer;
    border: 2px solid var(--white);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.kg-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

.kg-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-blue);
    cursor: pointer;
    border: 2px solid var(--white);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.kg-slider:focus {
    background: var(--neutral-300);
}

/* =============================================================================
   FILTER CONTROLS
   ============================================================================= */

.kg-filter-controls {
    flex: 1;
    min-width: 280px;
}

.kg-filter-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.kg-filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.kg-filter-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--neutral-800);
    margin: 0 0 0.5rem 0;
}

.kg-filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.kg-filter-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--white);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    color: var(--neutral-700);
    min-height: 36px;
}

.kg-filter-checkbox:hover {
    border-color: var(--primary-blue);
    background: var(--primary-light);
    color: var(--primary-navy);
}

.kg-filter-checkbox.checked {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-navy) 100%);
    border-color: var(--primary-blue);
    color: var(--white);
}

.kg-filter-checkbox input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-radius: 3px;
    background: transparent;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.kg-filter-checkbox input[type="checkbox"]:checked {
    background: currentColor;
}

.kg-filter-checkbox input[type="checkbox"]:checked::before {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 10px;
    font-weight: bold;
}

/* Clear Filters */
.kg-clear-filters {
    background: linear-gradient(135deg, var(--error) 0%, #b91c1c 100%);
    color: var(--white);
    border: none;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    min-height: 44px;
}

.kg-clear-filters:hover {
    background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.kg-clear-filters:active {
    transform: translateY(0);
}

.kg-clear-filters:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.3);
}

/* =============================================================================
   SEARCH INTERFACE
   ============================================================================= */

.kg-search-controls {
    flex: 1;
    min-width: 320px;
}

.kg-search-container {
    position: relative;
    margin-bottom: 1rem;
}

.kg-search-box {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    background: var(--white);
    transition: all 0.2s ease;
    font-family: inherit;
}

.kg-search-box:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.kg-search-box::placeholder {
    color: var(--neutral-400);
}

.kg-search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    color: var(--neutral-400);
    pointer-events: none;
}

/* Search Autocomplete */
.kg-autocomplete {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border: 1px solid var(--neutral-200);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.kg-autocomplete.visible {
    display: block;
}

.kg-autocomplete-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--neutral-100);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.kg-autocomplete-item:hover {
    background: var(--primary-light);
    color: var(--primary-navy);
}

.kg-autocomplete-item.highlighted {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-navy) 100%);
    color: var(--white);
}

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

.kg-autocomplete-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.kg-autocomplete-details {
    font-size: 0.875rem;
    color: var(--neutral-600);
}

.kg-autocomplete-item.highlighted .kg-autocomplete-details {
    color: rgba(255, 255, 255, 0.8);
}

/* Search Actions */
.kg-search-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.kg-search-btn {
    background: var(--white);
    border: 2px solid var(--primary-blue);
    color: var(--primary-blue);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 36px;
}

.kg-search-btn:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.kg-search-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.kg-search-btn svg {
    width: 1rem;
    height: 1rem;
}

/* =============================================================================
   NODE AND EDGE STYLING (D3.js Integration)
   ============================================================================= */

/* Node base styles */
.kg-node {
    cursor: pointer;
    transition: all 0.2s ease;
}

.kg-node:hover {
    filter: brightness(1.1);
}

.kg-node.selected {
    filter: brightness(1.2) drop-shadow(0 0 8px rgba(59, 130, 246, 0.6));
}

.kg-node.highlighted {
    filter: brightness(1.3) drop-shadow(0 0 12px rgba(59, 130, 246, 0.8));
    animation: kg-pulse 2s infinite;
}

@keyframes kg-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Edge styles */
.kg-edge {
    transition: all 0.2s ease;
}

.kg-edge.highlighted {
    stroke-width: 3px !important;
    stroke: var(--primary-blue) !important;
    opacity: 0.9 !important;
    animation: kg-flow 2s linear infinite;
}

@keyframes kg-flow {
    0% { stroke-dashoffset: 0; }
    100% { stroke-dashoffset: -20; }
}

/* Node labels */
.kg-label {
    font-family: inherit;
    font-size: 11px;
    font-weight: 500;
    fill: var(--neutral-800);
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: middle;
}

.kg-label.highlighted {
    font-weight: 600;
    fill: var(--primary-navy);
}

/* =============================================================================
   TOOLTIP SYSTEM
   ============================================================================= */

.kg-tooltip {
    position: absolute;
    background: var(--neutral-900);
    color: var(--white);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    line-height: 1.4;
    box-shadow: var(--shadow-xl);
    pointer-events: none;
    z-index: 1000;
    max-width: 280px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.kg-tooltip.visible {
    opacity: 1;
}

/* Also style generic graph tooltip class used by visualization */
.graph-tooltip {
    position: absolute;
    background: var(--neutral-900);
    color: var(--white);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    line-height: 1.4;
    box-shadow: var(--shadow-xl);
    pointer-events: none;
    z-index: 1000;
    max-width: 280px;
}

/* =============================================================================
   STATISTICS DISPLAY
   ============================================================================= */

.kg-stats {
    background: var(--white);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: space-around;
    align-items: center;
}

.kg-stats-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.kg-stats-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--neutral-500);
}

.kg-stats-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--neutral-800);
}

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */

@media (max-width: 1024px) {
    .kg-controls-row {
        flex-direction: column;
    }
    
    .kg-search-controls,
    .kg-layout-controls,
    .kg-filter-controls {
        width: 100%;
        min-width: unset;
    }
}

@media (max-width: 768px) {
    .kg-header {
        padding: 1rem 1.5rem;
    }
    
    .kg-header h2 {
        font-size: 1.25rem;
    }
    
    .toggle-graph-btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .kg-visualization {
        height: 400px;
        min-height: 300px;
    }
    
    .kg-controls-wrapper {
        padding: 1rem 1.5rem;
    }
    
    .kg-stats {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .kg-stats-item {
        width: 100%;
        flex-direction: row;
        justify-content: space-between;
    }
    
    .kg-layout-modes {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .kg-header {
        padding: 0.875rem 1rem;
    }
    
    .kg-header h2 {
        font-size: 1.125rem;
    }
    
    .toggle-graph-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
    }
    
    .kg-controls-wrapper {
        padding: 0.875rem 1rem;
    }
    
    .kg-control-panel-content {
        padding: 1rem;
    }
    
    .kg-filter-options {
        flex-direction: column;
    }
    
    .kg-filter-checkbox {
        width: 100%;
    }
}

/* =============================================================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================================================= */

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Skip link for screen readers */
.kg-skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-blue);
    color: var(--white);
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 1001;
}

.kg-skip-link:focus {
    top: 0.5rem;
}

/* Screen reader only text */
.kg-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .kg-container {
        transition: none;
    }
    
    .toggle-graph-btn svg {
        transition: none;
    }
}

/* High contrast mode adjustments */
@media (prefers-contrast: high) {
    .kg-header,
    .kg-control-panel-header {
        background: var(--white);
    }
    
    .kg-visualization {
        background: var(--white);
        border: 2px solid var(--neutral-800);
    }
    
    .kg-node {
        stroke-width: 2px;
    }
    
    .kg-edge {
        stroke-width: 2px;
    }
}

/* Dark mode support */
[data-theme="dark"] .knowledge-graph-section {
    background: var(--neutral-900);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .kg-header {
    background: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-900) 100%);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .kg-header h2 {
    color: var(--neutral-100);
}

[data-theme="dark"] .kg-container {
    background: var(--neutral-900);
}

[data-theme="dark"] .kg-visualization {
    background: linear-gradient(135deg, var(--neutral-900) 0%, rgba(59, 130, 246, 0.05) 100%);
}

[data-theme="dark"] .kg-controls-wrapper {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .kg-control-panel {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .kg-control-panel-header {
    background: linear-gradient(135deg, var(--neutral-700) 0%, var(--neutral-800) 100%);
    border-color: var(--neutral-600);
}

[data-theme="dark"] .kg-stats {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .kg-stats-value {
    color: var(--neutral-100);
}

[data-theme="dark"] .kg-search-box,
[data-theme="dark"] .kg-layout-btn,
[data-theme="dark"] .kg-filter-checkbox {
    background: var(--neutral-800);
    border-color: var(--neutral-600);
    color: var(--neutral-200);
}

[data-theme="dark"] .kg-search-box:focus,
[data-theme="dark"] .kg-layout-btn:hover,
[data-theme="dark"] .kg-filter-checkbox:hover {
    border-color: var(--primary-blue);
    background: var(--neutral-700);
}

[data-theme="dark"] .kg-layout-btn.active,
[data-theme="dark"] .kg-filter-checkbox.checked {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-navy) 100%);
    border-color: var(--primary-blue);
    color: var(--white);
}

[data-theme="dark"] .kg-label {
    fill: var(--neutral-200);
}

[data-theme="dark"] .kg-tooltip,
[data-theme="dark"] .graph-tooltip {
    background: var(--neutral-800);
    border: 1px solid var(--neutral-600);
}

/* =============================================================================
   PRINT STYLES
   ============================================================================= */

@media print {
    .knowledge-graph-section {
        page-break-inside: avoid;
    }
    
    .toggle-graph-btn {
        display: none;
    }
    
    .kg-container {
        max-height: none !important;
        opacity: 1 !important;
    }
    
    .kg-controls-wrapper {
        display: none;
    }
    
    .kg-visualization {
        height: auto;
        min-height: 600px;
    }
}