/* TabGroup Vault Blog - Shared Styles */
/* Matches landing page design system */

:root {
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-light: #60A5FA;
    --color-secondary: #6B7280;
    --color-accent: #F97316;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;
    --color-background: #F9FAFB;
    --color-page: #F9FAFB;
    --color-surface: #FFFFFF;
    --color-surface-alt: #F8FAFC;
    --color-border: #E5E7EB;
    --color-border-strong: #D1D5DB;
    --color-text-primary: #111827;
    --color-text-secondary: #6B7280;
    --color-text-muted: #9CA3AF;
    --color-highlight: rgba(59, 130, 246, 0.08);
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --gradient-hero: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(107, 114, 128, 0.04) 100%);
    --gradient-card: linear-gradient(135deg, rgba(59, 130, 246, 0.06), rgba(107, 114, 128, 0.04));
    --transition: all 180ms ease;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: var(--color-page);
    color: var(--color-text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ── Navigation ── */
.blog-nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-6);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.92);
}

.blog-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.blog-nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--color-text-primary);
    font-weight: 700;
    font-size: 16px;
}

.blog-nav-brand img {
    width: 32px;
    height: 32px;
}

.blog-nav-brand span {
    color: var(--color-text-muted);
    font-weight: 400;
    font-size: 14px;
}

.blog-nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: 14px;
}

.blog-nav-links a {
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

.blog-nav-links a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    text-decoration: none !important;
}

.btn-primary {
    background: var(--color-primary);
    color: #FFFFFF !important;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

/* ── Blog Index ── */
.blog-hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-12) var(--space-6) var(--space-8);
    text-align: center;
}

.blog-hero h1 {
    font-size: 38px;
    line-height: 1.15;
    margin: 0 0 var(--space-3);
}

.blog-hero p {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin: 0;
    max-width: 640px;
    margin: 0 auto;
}

.blog-categories {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
}

.blog-category {
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.blog-category:hover,
.blog-category.active {
    background: var(--color-highlight);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.blog-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-12);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-5);
}

.blog-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.blog-card-image {
    height: 200px;
    background: var(--gradient-hero);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.blog-card-image .placeholder-icon {
    font-size: 48px;
    color: var(--color-primary);
    opacity: 0.3;
}

.blog-card-body {
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    flex: 1;
}

.blog-card-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-highlight);
    padding: 4px 10px;
    border-radius: 999px;
    width: fit-content;
}

.blog-card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.3;
    margin: 0;
    color: var(--color-text-primary);
}

.blog-card-title a {
    color: inherit;
}

.blog-card-title a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.blog-card-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.6;
    flex: 1;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 13px;
    color: var(--color-text-muted);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

/* ── Article Page ── */
.article-wrapper {
    max-width: 760px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6) var(--space-12);
}

.article-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.article-breadcrumb a {
    color: var(--color-text-muted);
}

.article-breadcrumb a:hover {
    color: var(--color-primary);
}

.article-header {
    margin-bottom: var(--space-8);
}

.article-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-highlight);
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: var(--space-4);
}

.article-header h1 {
    font-size: 36px;
    line-height: 1.2;
    margin: 0 0 var(--space-4);
    color: var(--color-text-primary);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: 14px;
    color: var(--color-text-muted);
}

/* Key Takeaways Box */
.key-takeaways {
    background: var(--color-highlight);
    border: 1px solid rgba(59, 130, 246, 0.15);
    border-radius: var(--radius);
    padding: var(--space-5);
    margin-bottom: var(--space-8);
}

.key-takeaways h2 {
    font-size: 16px;
    margin: 0 0 var(--space-3);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.key-takeaways ul {
    margin: 0;
    padding-left: 20px;
    color: var(--color-text-secondary);
    font-size: 15px;
}

.key-takeaways li {
    margin-bottom: var(--space-2);
}

/* Article Content */
.article-content h2 {
    font-size: 26px;
    margin: var(--space-10) 0 var(--space-4);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.article-content h2:first-child {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

.article-content h3 {
    font-size: 20px;
    margin: var(--space-6) 0 var(--space-3);
    color: var(--color-text-primary);
}

.article-content p {
    margin: 0 0 var(--space-4);
    color: var(--color-text-secondary);
    font-size: 16px;
    line-height: 1.8;
}

.article-content ul,
.article-content ol {
    margin: 0 0 var(--space-4);
    padding-left: 24px;
    color: var(--color-text-secondary);
    font-size: 16px;
    line-height: 1.8;
}

.article-content li {
    margin-bottom: var(--space-2);
}

.article-content strong {
    color: var(--color-text-primary);
}

.article-content blockquote {
    border-left: 4px solid var(--color-primary);
    margin: var(--space-6) 0;
    padding: var(--space-4) var(--space-5);
    background: var(--color-highlight);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Image Placeholder */
.image-placeholder {
    background: var(--gradient-hero);
    border: 2px dashed rgba(59, 130, 246, 0.25);
    border-radius: var(--radius);
    padding: var(--space-8) var(--space-5);
    margin: var(--space-6) 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

.image-placeholder .placeholder-icon {
    font-size: 40px;
    color: var(--color-primary);
    opacity: 0.4;
}

.image-placeholder .placeholder-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    opacity: 0.7;
}

.image-placeholder .placeholder-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    max-width: 400px;
}

/* Comparison Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    margin: var(--space-6) 0;
    font-size: 15px;
}

.comparison-table th,
.comparison-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table thead {
    background: rgba(59, 130, 246, 0.06);
}

.comparison-table thead th {
    font-weight: 700;
    color: var(--color-text-primary);
    font-size: 14px;
}

.comparison-table tbody tr:hover {
    background: rgba(59, 130, 246, 0.03);
}

.comparison-table tbody td {
    color: var(--color-text-secondary);
}

/* Info Box / Callout */
.info-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-5);
    margin: var(--space-6) 0;
    box-shadow: var(--shadow-sm);
}

.info-box.tip {
    border-left: 4px solid var(--color-success);
    background: rgba(16, 185, 129, 0.04);
}

.info-box.warning {
    border-left: 4px solid var(--color-warning);
    background: rgba(245, 158, 11, 0.04);
}

.info-box.product {
    border-left: 4px solid var(--color-primary);
    background: var(--color-highlight);
}

.info-box h4 {
    margin: 0 0 var(--space-2);
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.info-box p {
    margin: 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* FAQ Section */
.article-faq {
    margin-top: var(--space-10);
    padding-top: var(--space-8);
    border-top: 2px solid var(--color-border);
}

.article-faq h2 {
    border-top: none !important;
    padding-top: 0 !important;
    margin-top: 0 !important;
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: var(--space-3);
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    padding: var(--space-4);
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.faq-item summary::after {
    content: "+";
    font-size: 20px;
    color: var(--color-primary);
    font-weight: 300;
}

.faq-item[open] summary::after {
    content: "\2212";
}

.faq-item .faq-answer {
    padding: 0 var(--space-4) var(--space-4);
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* CTA Banner */
.article-cta {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(107, 114, 128, 0.04) 100%);
    border: 1px solid rgba(59, 130, 246, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin: var(--space-10) 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.article-cta h3 {
    margin: 0;
    font-size: 24px;
    color: var(--color-text-primary);
}

.article-cta p {
    margin: 0;
    font-size: 15px;
    color: var(--color-text-secondary);
    max-width: 500px;
}

.article-cta .cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
}

/* Related Articles */
.related-articles {
    margin-top: var(--space-10);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

.related-articles h2 {
    border-top: none !important;
    padding-top: 0 !important;
    margin-top: 0 !important;
    font-size: 22px;
    margin-bottom: var(--space-5) !important;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-4);
}

.related-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.related-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.related-card-tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.related-card h3 {
    font-size: 15px;
    margin: 0;
    line-height: 1.4;
}

.related-card h3 a {
    color: var(--color-text-primary);
}

.related-card h3 a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Footer */
.blog-footer {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-6);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-4);
    color: var(--color-text-muted);
    font-size: 14px;
    border-top: 1px solid var(--color-border);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.footer-links a {
    color: var(--color-text-muted);
}

.footer-links a:hover {
    color: var(--color-primary);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .blog-hero h1 { font-size: 28px; }
    .blog-grid { grid-template-columns: 1fr; padding: 0 var(--space-4) var(--space-8); }
    .article-wrapper { padding: var(--space-6) var(--space-4) var(--space-10); }
    .article-header h1 { font-size: 28px; }
    .article-content h2 { font-size: 22px; }
    .blog-nav-links { display: none; }
    .article-cta { padding: var(--space-5); }
    .comparison-table { font-size: 13px; }
    .comparison-table th, .comparison-table td { padding: 10px 12px; }
}

@media (max-width: 480px) {
    .blog-hero h1 { font-size: 24px; }
    .article-header h1 { font-size: 24px; }
    .blog-categories { gap: 6px; }
    .blog-category { font-size: 12px; padding: 6px 12px; }
}