/* ============================================
   SEO Page Overrides
   ============================================ */

.seo-page .input-section {
    padding-top: 0;
}

.seo-page .hero,
.seo-page .examples {
    display: none;
}

.seo-page .main {
    gap: 2rem;
}

/* ============================================
   SEO Hero (H1 Section)
   ============================================ */

.seo-hero {
    text-align: center;
    padding-top: 3rem;
}

.seo-hero h1 {
    font-family: var(--font-mono);
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--c-text);
    line-height: 1.2;
    margin-bottom: 0.75rem;
}

.seo-hero p {
    font-size: 1.125rem;
    color: var(--c-text-secondary);
    max-width: clamp(560px, 60%, 720px);
    margin: 0 auto;
    line-height: 1.6;
}

/* ============================================
   Educational Content
   ============================================ */

.seo-content {
    line-height: 1.7;
}

.seo-content h2 {
    font-family: var(--font-mono);
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--c-text);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.seo-content h3 {
    font-family: var(--font-mono);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--c-text);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.seo-content h4 {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--c-text);
    margin-top: 1.25rem;
    margin-bottom: 0.375rem;
}

.seo-content p {
    color: var(--c-text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.seo-content code {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: 4px;
    padding: 0.1rem 0.35rem;
    color: var(--c-accent);
}

.seo-content ul {
    list-style: none;
    margin-bottom: 1rem;
    padding-left: 0;
}

.seo-content li {
    color: var(--c-text-secondary);
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.375rem;
}

.seo-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background: var(--c-accent);
}

/* ============================================
   Formula / Code Blocks
   ============================================ */

.seo-content .formula-block {
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--c-accent);
    line-height: 1.8;
    overflow-x: auto;
}

.seo-content .formula-block .label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.375rem;
}

.seo-content .formula-block .step {
    display: block;
    color: var(--c-text-secondary);
}

.seo-content .formula-block .step .val {
    color: var(--c-accent);
}

.seo-content .formula-block .result {
    display: block;
    color: var(--c-text);
    font-weight: 600;
    margin-top: 0.25rem;
}

/* ============================================
   Format Comparison Table
   ============================================ */

.seo-content .format-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.seo-content .format-table th,
.seo-content .format-table td {
    text-align: left;
    padding: 0.625rem 0.875rem;
    border-bottom: 1px solid var(--c-border);
}

.seo-content .format-table th {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.seo-content .format-table td {
    color: var(--c-text-secondary);
}

.seo-content .format-table td code {
    font-size: 0.875rem;
}

.seo-content .format-table tbody tr {
    transition: background 0.15s ease;
}

.seo-content .format-table tbody tr:hover {
    background: var(--c-bg-card);
}

/* ============================================
   Pitfalls / Warning Callout
   ============================================ */

.seo-content .pitfall {
    background: var(--c-bg-card);
    border-left: 3px solid var(--c-accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 0.875rem 1rem;
    margin-bottom: 0.5rem;
}

.seo-content .pitfall strong {
    color: var(--c-text);
}

.seo-content .pitfall p {
    margin-bottom: 0;
    font-size: 1rem;
}

/* ============================================
   FAQ Accordion
   ============================================ */

.seo-faq {
    border-top: 1px solid var(--c-border);
    padding-top: 2rem;
}

.seo-faq h2 {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--c-text);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.seo-faq details {
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    background: var(--c-bg-card);
    transition: border-color 0.15s ease;
}

.seo-faq details:hover {
    border-color: var(--c-text-muted);
}

.seo-faq details[open] {
    border-color: var(--c-accent);
}

.seo-faq summary {
    padding: 0.875rem 1rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--c-text);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.seo-faq summary::-webkit-details-marker {
    display: none;
}

.seo-faq summary::after {
    content: '+';
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--c-text-muted);
    flex-shrink: 0;
    transition: transform 0.15s ease;
}

.seo-faq details[open] summary::after {
    content: '\2212';
    color: var(--c-accent);
}

.seo-faq .faq-answer {
    padding: 0 1rem 1rem;
    color: var(--c-text-secondary);
    line-height: 1.6;
    font-size: 1rem;
}

/* ============================================
   Cross-links
   ============================================ */

.seo-crosslinks {
    border-top: 1px solid var(--c-border);
    padding-top: 2rem;
}

.seo-crosslinks h2 {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--c-text);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.crosslinks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.625rem;
}

.crosslink-card {
    display: block;
    text-decoration: none;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    padding: 0.875rem 1rem;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.crosslink-card:hover {
    border-color: var(--c-text-muted);
    background: #172035;
}

.crosslink-title {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--c-text);
    margin-bottom: 0.25rem;
}

.crosslink-desc {
    font-size: 0.875rem;
    color: var(--c-text-secondary);
}

/* ============================================
   Diff Comparison (UNECE vs Unlocoder)
   ============================================ */

.diff-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
}

.diff-panel {
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid var(--c-border);
}

.diff-panel-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--c-border);
}

.diff-panel--before .diff-panel-header {
    background: rgba(239, 68, 68, 0.06);
    color: var(--c-text-secondary);
}

.diff-panel--after .diff-panel-header {
    background: rgba(34, 197, 94, 0.06);
    color: var(--c-text-secondary);
}

.diff-panel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.diff-panel-dot--before {
    background: #ef4444;
}

.diff-panel-dot--after {
    background: #22c55e;
}

.diff-code {
    margin: 0;
    padding: 1rem;
    background: var(--c-bg-input);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--c-text-secondary);
    overflow-x: auto;
}

.diff-code code {
    background: none;
    padding: 0;
    font-size: inherit;
    color: inherit;
}

.diff-line {
    color: var(--c-text-secondary);
}

.diff-line-muted {
    color: var(--c-text-muted);
    font-style: italic;
}

.diff-added {
    color: #4ade80;
    background: rgba(34, 197, 94, 0.08);
    display: inline-block;
    width: 100%;
    margin: 0 -1rem;
    padding: 0 1rem;
    box-sizing: content-box;
}

/* ============================================
   Live diff comparison (in results area)
   ============================================ */

.diff-comparison--live {
    margin: 0;
}

.locode-api-cta {
    display: inline-block;
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--c-accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

.locode-api-cta:hover {
    color: var(--c-accent-hover);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
    .seo-hero h1 {
        font-size: 1.625rem;
    }

    .seo-hero {
        padding-top: 2rem;
    }

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

    .seo-content .format-table {
        font-size: 0.875rem;
    }

    .seo-content .format-table th,
    .seo-content .format-table td {
        padding: 0.5rem 0.5rem;
    }

    .diff-comparison {
        grid-template-columns: 1fr;
    }

    .diff-code {
        font-size: 0.8125rem;
    }
}