/* ================================================
   Knowledge Base Library Styles
   ================================================ */

/* Page Container */
.kb-page {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-app);
    overflow: hidden;
}

/* Toolbar */
.kb-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 20px 24px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.kb-toolbar-left {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.kb-breadcrumb {
    display: flex;
    align-items: center;
    font-size: 12px;
    color: var(--text-tertiary);
}

.kb-breadcrumb .crumb-root:hover {
    color: var(--primary-color);
}

.kb-breadcrumb .crumb-separator {
    margin: 0 6px;
}

.kb-breadcrumb .crumb-current {
    color: var(--text-secondary);
    font-weight: 500;
}

.kb-toolbar-title-row {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.kb-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

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

.kb-toolbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Search Box */
.kb-search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.kb-search-box > i {
    position: absolute;
    left: 12px;
    color: var(--text-tertiary);
    font-size: 14px;
    pointer-events: none;
}

.kb-search-input {
    padding: 8px 36px 8px 36px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 13px;
    width: 260px;
    background: var(--bg-surface);
    color: var(--text-primary);
    transition: all 0.15s ease;
}

.kb-search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-bg-light);
}

.kb-search-input::placeholder {
    color: var(--text-tertiary);
}

.kb-search-clear {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.15s;
}

.kb-search-clear:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

/* Main Layout */
.kb-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Main Content Area */
.kb-main {
    flex: 1;
    padding: 20px 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Filters Bar */
.kb-filters-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: var(--bg-surface);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.kb-filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.kb-filter-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.kb-filter-select {
    padding: 6px 28px 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M2.5 4.5L6 8l3.5-3.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.kb-filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.kb-clear-filters {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-surface-hover);
    border: none;
    border-radius: 6px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    margin-left: auto;
    transition: all 0.15s;
}

.kb-clear-filters:hover {
    background: var(--bg-surface-active);
    color: var(--text-primary);
}

/* Cards Grid */
.kb-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

/* Article Card */
.kb-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.kb-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.kb-card-selected {
    border-color: var(--primary-color);
    background: var(--primary-bg-light);
    box-shadow: 0 0 0 3px var(--primary-bg-light);
}

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

.kb-number {
    font-family: monospace;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
}

.kb-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.kb-card-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.kb-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.kb-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.kb-card-meta i {
    margin-right: 4px;
}

.kb-card-date {
    font-size: 11px;
    color: var(--text-tertiary);
}

/* State Badges */
.kb-state {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.kb-state-published {
    background: rgba(34, 197, 94, 0.15);
    color: #16a34a;
}

.kb-state-draft {
    background: rgba(245, 158, 11, 0.15);
    color: #d97706;
}

.kb-state-archived {
    background: rgba(107, 114, 128, 0.15);
    color: #6b7280;
}

/* Loading State */
.kb-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 60px 20px;
    color: var(--text-tertiary);
}

/* Empty State */
.kb-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 60px 20px;
    text-align: center;
}

.kb-empty i {
    font-size: 48px;
    color: var(--text-tertiary);
    opacity: 0.5;
}

.kb-empty h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.kb-empty p {
    margin: 0;
    font-size: 14px;
    color: var(--text-tertiary);
}

/* Pagination */
.kb-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 20px 0;
    margin-top: auto;
}

.kb-page-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-surface);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.kb-page-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.kb-page-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.kb-page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.kb-page-ellipsis {
    padding: 0 8px;
    color: var(--text-tertiary);
}

.kb-page-info {
    margin-left: 12px;
    font-size: 13px;
    color: var(--text-tertiary);
}

/* Sidebar */
.kb-sidebar {
    width: 300px;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    flex-shrink: 0;
}

.kb-sidebar-section {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.kb-sidebar-section:last-child {
    border-bottom: none;
}

.kb-sidebar-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.kb-sidebar-header i {
    color: var(--text-tertiary);
}

.kb-sidebar-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.kb-sidebar-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    border: none;
    border-radius: 6px;
    background: transparent;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
    width: 100%;
}

.kb-sidebar-item:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.kb-sidebar-item.active {
    background: var(--primary-bg-light);
    color: var(--primary-color);
    font-weight: 500;
}

.kb-sidebar-item-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.kb-sidebar-item-count {
    flex-shrink: 0;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 10px;
    background: var(--bg-surface-hover);
    color: var(--text-tertiary);
}

.kb-sidebar-item.active .kb-sidebar-item-count {
    background: var(--primary-color);
    color: white;
}

/* Recently Updated */
.kb-recent-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.kb-recent-item {
    padding: 8px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.kb-recent-item:hover {
    background: var(--bg-surface-hover);
}

.kb-recent-title {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.kb-recent-date {
    font-size: 11px;
    color: var(--text-tertiary);
}

/* Tags Cloud */
.kb-tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.kb-tag {
    padding: 4px 10px;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background: var(--bg-surface);
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.kb-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-bg-light);
}

/* Preview Panel */
.kb-preview {
    padding: 20px;
}

.kb-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.kb-preview-number {
    font-family: monospace;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
}

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

.kb-preview-close:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.kb-preview-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin: 0 0 12px 0;
}

.kb-preview-badges {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.kb-category-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    background: var(--bg-surface-hover);
    color: var(--text-secondary);
}

.kb-preview-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    max-height: 150px;
    overflow: hidden;
    position: relative;
}

.kb-preview-description::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(transparent, var(--bg-surface));
}

.kb-preview-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    background: var(--bg-app);
    border-radius: 8px;
    margin-bottom: 16px;
}

.kb-preview-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.kb-preview-meta-item i {
    color: var(--text-tertiary);
    width: 16px;
    text-align: center;
}

.kb-preview-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.kb-tag-small {
    padding: 2px 8px;
    border-radius: 10px;
    background: var(--bg-surface-hover);
    font-size: 11px;
    color: var(--text-tertiary);
}

.kb-preview-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.kb-preview-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

/* Responsive */
@media (max-width: 1024px) {
    .kb-sidebar {
        width: 280px;
    }

    .kb-cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .kb-layout {
        flex-direction: column;
    }

    .kb-sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
        max-height: 300px;
    }

    .kb-toolbar {
        flex-direction: column;
        gap: 16px;
    }

    .kb-toolbar-right {
        width: 100%;
        flex-wrap: wrap;
    }

    .kb-search-input {
        width: 100%;
        flex: 1;
    }

    .kb-filters-bar {
        flex-wrap: wrap;
    }

    .kb-cards-grid {
        grid-template-columns: 1fr;
    }
}