/* Knowledge Base Module - Base Styles (kb- prefix) */
@import '/gestalt-variables.css';

/* ─── Layout ─── */
.kb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md, 16px);
}

.kb-section {
    padding: var(--space-xl, 48px) 0;
}

/* ─── Hero Section ─── */
.kb-hero {
    background-color: var(--color-bg-subtle, #f8f9fa);
    padding: 48px 0 32px;
    margin-bottom: var(--space-lg, 24px);
}

.kb-hero-title {
    font-size: var(--font-3xl, 2.5rem);
    font-weight: var(--font-bold, 700);
    margin-bottom: var(--space-sm, 8px);
    color: var(--color-text, #2c3e50);
}

.kb-hero-subtitle {
    font-size: var(--font-lg, 1.25rem);
    color: var(--color-text-secondary, #6c757d);
    max-width: 700px;
}

/* ─── Breadcrumb ─── */
.kb-breadcrumb {
    font-size: 0.9rem;
    color: var(--color-text-secondary, #6c757d);
    margin-bottom: var(--space-md, 16px);
}

.kb-breadcrumb a {
    color: var(--color-primary, #3172ae);
    text-decoration: none;
    font-weight: 500;
}

.kb-breadcrumb a:hover {
    text-decoration: underline;
}

.kb-breadcrumb-separator {
    margin: 0 0.5rem;
    color: var(--color-text-light, #909090);
}

/* ─── Category Filters ─── */
.kb-filters {
    padding: var(--space-md, 16px) 0;
}

.kb-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm, 8px);
}

.kb-filter-btn {
    padding: 8px 20px;
    border: 1px solid var(--color-border, #e9ecef);
    border-radius: 50px;
    background: #ffffff;
    color: var(--color-text-secondary, #6c757d);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.kb-filter-btn:hover {
    border-color: var(--color-primary, #3172ae);
    color: var(--color-primary, #3172ae);
}

.kb-filter-btn.kb-filter-active {
    background-color: var(--color-primary, #3172ae);
    border-color: var(--color-primary, #3172ae);
    color: #ffffff;
}

/* ─── Article Grid ─── */
.kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg, 24px);
}

/* ─── Article Cards ─── */
.kb-card {
    background: #ffffff;
    border-radius: var(--radius-lg, 12px);
    box-shadow: var(--elevation-1, 0 2px 4px rgba(0,0,0,0.05));
    padding: var(--space-lg, 24px);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid var(--color-border, #e9ecef);
    text-decoration: none;
    color: inherit;
}

.kb-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--elevation-3, 0 10px 20px rgba(0,0,0,0.1));
    text-decoration: none;
    color: inherit;
}

.kb-card-header {
    margin-bottom: var(--space-sm, 8px);
}

.kb-card-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary, #3172ae);
    background-color: rgba(49, 114, 174, 0.08);
    padding: 4px 10px;
    border-radius: 4px;
}

.kb-card-body {
    flex: 1;
}

.kb-card-title {
    font-size: var(--font-lg, 1.25rem);
    font-weight: var(--font-bold, 700);
    color: var(--color-text, #2c3e50);
    margin-bottom: var(--space-sm, 8px);
    line-height: 1.3;
}

.kb-card-excerpt {
    color: var(--color-text-secondary, #6c757d);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--space-md, 16px);
}

.kb-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: var(--space-md, 16px);
    border-top: 1px solid var(--color-border, #e9ecef);
}

.kb-card-date {
    font-size: 0.85rem;
    color: var(--color-text-light, #909090);
}

.kb-card-read-more {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary, #3172ae);
}

.kb-card:hover .kb-card-read-more {
    color: var(--color-primary-dark, #285f8f);
}

/* ─── Empty State ─── */
.kb-empty-state {
    text-align: center;
    padding: 80px 20px;
}

.kb-empty-icon {
    font-size: 4rem;
    color: var(--color-text-light, #909090);
    margin-bottom: var(--space-lg, 24px);
}

.kb-empty-state h2 {
    font-size: var(--font-2xl, 2rem);
    margin-bottom: var(--space-sm, 8px);
    color: var(--color-text, #2c3e50);
}

.kb-empty-state p {
    color: var(--color-text-secondary, #6c757d);
    max-width: 500px;
    margin: 0 auto var(--space-lg, 24px);
}

/* ─── Shared Button ─── */
.kb-btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--color-primary, #3172ae);
    color: #ffffff;
    text-align: center;
    border-radius: var(--radius-md, 8px);
    font-weight: var(--font-medium, 500);
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.kb-btn:hover {
    background-color: var(--color-primary-dark, #285f8f);
    color: #ffffff;
    text-decoration: none;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .kb-hero {
        padding: 32px 0 24px;
    }

    .kb-hero-title {
        font-size: 2rem;
    }

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

    .kb-filter-bar {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 8px;
    }

    .kb-filter-btn {
        white-space: nowrap;
    }
}