/* ============================================
   KNOWLEDGE BASE CATEGORIES CSS
   ============================================ */

/* Category Management Page Layout */
.kb-categories-page {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-app);
}

.kb-categories-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    gap: 16px;
}

.kb-categories-header .header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.kb-categories-header .btn-back {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.kb-categories-header .btn-back:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.kb-categories-header .header-titles h1 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.kb-categories-header .header-subtitle {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--text-tertiary);
}

.kb-categories-header .header-actions {
    display: flex;
    gap: 12px;
}

/* Layout */
.kb-categories-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    flex: 1;
    overflow: hidden;
}

@media (max-width: 1024px) {
    .kb-categories-layout {
        grid-template-columns: 1fr;
    }

    .category-detail-section {
        display: none;
    }
}

/* Category Tree Section */
.category-tree-section {
    padding: 24px;
    overflow-y: auto;
}

.category-tree {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Loading / Empty States */
.loading-state,
.empty-state,
.no-selection {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
    color: var(--text-tertiary);
}

.loading-state {
    gap: 12px;
}

.empty-state i,
.no-selection i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3,
.no-selection h3 {
    margin: 0 0 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
}

.empty-state p,
.no-selection p {
    margin: 0 0 16px;
    font-size: 14px;
}

/* Category Tree Item Component */
.category-tree-item {
    border-radius: 8px;
    transition: background 0.15s;
}

.category-tree-item.drag-over {
    background: var(--primary-bg-light);
    outline: 2px dashed var(--primary-color);
}

.category-tree-content {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    padding-left: calc(var(--depth, 0) * 20px + 12px);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
}

.category-tree-content:hover {
    background: var(--bg-surface);
}

.category-tree-item.selected > .category-tree-content {
    background: var(--primary-bg-light);
}

.expand-btn {
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
    color: var(--text-tertiary);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    transition: all 0.15s;
}

.expand-btn:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.expand-placeholder {
    width: 24px;
    height: 24px;
}

.category-icon {
    font-size: 16px;
    width: 24px;
    text-align: center;
}

.category-name {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.category-count {
    font-size: 12px;
    color: var(--text-tertiary);
    padding: 2px 8px;
    background: var(--bg-app);
    border-radius: 10px;
}

.category-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.15s;
}

.category-tree-content:hover .category-actions {
    opacity: 1;
}

.action-btn {
    background: none;
    border: none;
    padding: 6px;
    cursor: pointer;
    color: var(--text-tertiary);
    border-radius: 4px;
    transition: all 0.15s;
}

.action-btn:hover {
    background: var(--bg-surface-hover);
    color: var(--primary-color);
}

.action-btn-danger:hover {
    color: var(--color-danger);
}

.category-children {
    margin-left: 0;
}

/* Badges */
.badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-system {
    background: var(--bg-app);
    color: var(--text-tertiary);
}

.badge-default {
    background: var(--primary-bg-light);
    color: var(--primary-color);
}

.badge-inactive {
    background: #fee2e2;
    color: #991b1b;
}

.badge-success {
    background: #dcfce7;
    color: #166534;
}

.badge-secondary {
    background: var(--bg-app);
    color: var(--text-tertiary);
}

.badge-primary {
    background: var(--primary-bg-light);
    color: var(--primary-color);
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

/* Category Detail Section */
.category-detail-section {
    background: var(--bg-surface);
    border-left: 1px solid var(--border-color);
    padding: 24px;
    overflow-y: auto;
}

/* Category Editor */
.category-editor {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.editor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.editor-header h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.btn-icon {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--text-tertiary);
    border-radius: 6px;
    transition: all 0.15s;
}

.btn-icon:hover {
    background: var(--bg-app);
    color: var(--text-primary);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background: var(--bg-app);
    color: var(--text-primary);
    transition: border-color 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.icon-picker,
.color-picker {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-preview {
    font-size: 20px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-app);
    border-radius: 6px;
}

.color-preview {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.form-control-color {
    width: 80px;
    height: 36px;
    padding: 4px;
    cursor: pointer;
}

.form-checks {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-check-input {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.form-check-label {
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.editor-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

/* Category Details View */
.category-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.detail-header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.detail-icon {
    font-size: 32px;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-app);
    border-radius: 12px;
}

.detail-titles h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.detail-path {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--text-tertiary);
}

.detail-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.detail-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.stat-item {
    text-align: center;
    padding: 16px;
    background: var(--bg-app);
    border-radius: 8px;
}

.stat-value {
    display: block;
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 4px;
}

.detail-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--bg-app);
    border-radius: 8px;
}

.meta-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.meta-label {
    font-size: 13px;
    color: var(--text-tertiary);
}

.meta-value {
    font-size: 13px;
    color: var(--text-primary);
    display: flex;
    gap: 6px;
}

.detail-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.system-notice {
    font-size: 13px;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-app);
    border-radius: 8px;
}

/* Category Nav Item Component (Sidebar) */
.category-nav-item {
    display: flex;
    flex-direction: column;
}

.category-nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    padding: 8px 12px;
    padding-left: calc(var(--depth, 0) * 12px + 12px);
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.15s;
    color: var(--text-primary);
    font-size: 13px;
}

.category-nav-btn:hover {
    background: var(--bg-surface-hover);
}

.category-nav-item.active > .category-nav-btn {
    background: var(--primary-bg-light);
    color: var(--primary-color);
}

.expand-toggle {
    font-size: 10px;
    width: 16px;
    color: var(--text-tertiary);
}

.nav-icon {
    font-size: 14px;
    width: 18px;
    text-align: center;
}

.nav-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-count {
    font-size: 11px;
    color: var(--text-tertiary);
    padding: 1px 6px;
    background: var(--bg-app);
    border-radius: 8px;
}

.category-nav-children {
    display: flex;
    flex-direction: column;
}

/* Buttons */
.btn-primary {
    padding: 10px 16px;
    background: var(--primary-color);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.15s;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    padding: 10px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.15s;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-surface-hover);
}

.btn-danger {
    padding: 10px 16px;
    background: var(--color-danger, #dc3545);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.15s;
}

.btn-danger:hover:not(:disabled) {
    background: #bb2d3b;
}