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

/* Knowledge base page background - very light grey */
body {
    background-color: #fff;
}

.knowledgebase-section {
    padding: calc(var(--spacing-2xl) + 16px) 0 var(--spacing-2xl) 0;
    background: transparent;
    margin-top: 0;
}

.knowledgebase-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.knowledgebase-header .section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.knowledgebase-header .section-subtitle {
    font-size: 1rem;
    color: var(--color-text);
    line-height: 1.5;
    margin: 0;
}

.breadcrumb-nav {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}

.breadcrumb-nav ol {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.breadcrumb-nav li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-nav li:not(:last-child)::after {
    content: '→';
    color: var(--color-text-light);
    margin-left: 0.5rem;
    font-size: 0.875rem;
}

.breadcrumb-nav a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-nav a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.breadcrumb-nav li:last-child span {
    color: var(--color-text);
    font-weight: 500;
}

@media (max-width: 768px) {
    .knowledgebase-header {
        margin-bottom: var(--spacing-md);
    }
    
    .knowledgebase-header .section-title {
        font-size: 1.75rem;
    }
    
    .knowledgebase-header .section-subtitle {
        font-size: 0.9375rem;
    }
}

.knowledgebase-search {
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-md) 3rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-primary);
    background: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

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

.search-input:hover:not(:focus) {
    border-color: var(--color-border-dark);
}

.knowledgebase-search::before {
    content: '🔍';
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.125rem;
    pointer-events: none;
    opacity: 0.6;
}

.knowledgebase-search:focus-within::before {
    opacity: 0.8;
}

.knowledgebase-categories {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-md);
}

.category-filter {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
    transition: var(--transition-base);
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
}

.category-filter:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-dark);
}

.category-filter.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.category-filter.active:hover {
    background: var(--color-primary);
}

.category-select {
    display: none;
    width: 100%;
    max-width: 500px;
    margin: 0 auto var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-sm);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-family: var(--font-primary);
    background: #1e293b;
    color: #f1f5f9;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14' fill='none'%3E%3Cpath d='M3.5 5L7 8.5L10.5 5' stroke='%23f1f5f9' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    background-size: 14px;
    padding-right: 2.5rem;
}

.category-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.category-select:hover {
    background: #334155;
}

.category-select option {
    padding: var(--spacing-xs);
    background: #1e293b;
    color: #f1f5f9;
}

/* Loading Spinner */
.kb-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    min-height: 300px;
}

.kb-loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.kb-loading-spinner svg {
    color: var(--color-primary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.kb-loading-text {
    font-size: 1rem;
    color: var(--color-text-light);
    margin: 0;
    font-weight: 500;
}

.kb-loading.hidden {
    display: none;
}

.terms-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.term-card {
    width: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    padding-left: calc(var(--spacing-lg) + 4px);
    border-left: 4px solid;
    background-color: #ffffff;
    border-radius: 0 8px 8px 0;
    margin-bottom: 0px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.term-card:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.term-card.description {
    border-left-color: #2563eb; /* Blue for calculator descriptions */
    background: linear-gradient(to right, #eff6ff 0%, #ffffff 8%);
}

.term-card.form-info {
    border-left-color: #059669; /* Green for form info */
    background: linear-gradient(to right, #ecfdf5 0%, #ffffff 8%);
}

.term-card.element-info {
    border-left-color: #d97706; /* Amber/Orange for element info */
    background: linear-gradient(to right, #fffbeb 0%, #ffffff 8%);
}

.term-category {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-sm);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-block;
    width: fit-content;
}

.term-card.description .term-category {
    color: #1e40af;
    background-color: #dbeafe;
}

.term-card.form-info .term-breadcrumb {
    color: #047857;
    font-weight: 700;
}

.term-card.element-info .term-breadcrumb {
    color: #b45309;
    font-weight: 700;
}

.term-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.term-subtitle {
    font-size: 1rem;
    color: #4b5563;
    margin-bottom: var(--spacing-md);
    font-style: italic;
    line-height: 1.6;
}

.term-breadcrumb {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.breadcrumb-separator {
    font-size: 1.2em;
    display: inline-block;
    vertical-align: middle;
    margin: 0 0.25rem;
}

.term-definition {
    font-size: 1rem;
    color: #374151;
    line-height: 1.75;
    margin-top: var(--spacing-xs);
}

.term-definition strong {
    color: #1f2937;
    font-weight: 600;
}

.term-definition em {
    color: #4b5563;
    font-style: italic;
}

/* Link styling in knowledge base */
.term-definition a,
.term-subtitle a,
.term-title a {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease, text-decoration 0.2s ease;
    border-bottom: 1px solid transparent;
}

.term-definition a:hover,
.term-subtitle a:hover,
.term-title a:hover {
    color: #2563eb;
    text-decoration: underline;
    border-bottom-color: #2563eb;
}

.term-definition a:visited {
    color: #6366f1;
}

.term-definition a:visited:hover {
    color: #2563eb;
}

.term-definition a:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
    border-radius: 2px;
}

/* Links in breadcrumb */
.term-breadcrumb a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Links in category badges */
.term-category a {
    color: inherit;
    text-decoration: none;
}

.no-results {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-light);
}

.no-results a {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
}

.no-results a:hover {
    color: #2563eb;
    text-decoration: underline;
}

/* Go to Top Button */
.go-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background-color: #3b82f6;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background-color 0.2s ease;
    z-index: 1000;
}

.go-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.go-to-top:hover {
    background-color: #2563eb;
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.5);
    transform: translateY(-2px);
}

.go-to-top:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

.go-to-top:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

.go-to-top svg {
    width: 20px;
    height: 20px;
}

@media (max-width: 768px) {
    .go-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
    }
    
    .go-to-top svg {
        width: 18px;
        height: 18px;
    }
    
    .term-card {
        padding: var(--spacing-md);
        padding-left: calc(var(--spacing-md) + 4px);
        border-radius: 0 6px 6px 0;
    }
    
    .term-title {
        font-size: 1.125rem;
    }
    
    .term-definition {
        font-size: 0.9375rem;
    }
    
    .knowledgebase-categories {
        display: none;
    }
    
    .category-select {
        display: block;
    }
    
    .knowledgebase-search {
        margin-bottom: var(--spacing-sm);
    }
    
    .search-input {
        padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
        font-size: 0.9375rem;
    }
    
    .knowledgebase-search::before {
        font-size: 1rem;
        left: var(--spacing-sm);
    }
    
    .kb-loading {
        min-height: 250px;
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .kb-loading-spinner svg {
        width: 32px;
        height: 32px;
    }
    
    .kb-loading-text {
        font-size: 0.9375rem;
    }
}