/**
 * YT2Dude Blog - Spatial Dark Design System
 * Extends main style.css variables
 * Version 1.0
 */

/* =====================================================
   BLOG LAYOUT - SHARED
   ===================================================== */
.blog-page {
    min-height: 100vh;
    background: var(--bg-void);
    color: var(--text-primary);
    font-family: var(--font-body);
}

.blog-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.blog-container.narrow {
    max-width: 820px;
}

/* =====================================================
   BREADCRUMBS
   ===================================================== */
.breadcrumbs {
    padding: var(--space-4) 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.breadcrumbs a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
    color: var(--accent-primary);
}

.breadcrumbs .separator {
    color: var(--text-dim);
    font-size: 0.75rem;
}

.breadcrumbs .current {
    color: var(--text-muted);
}

/* =====================================================
   BLOG HEADER / HERO
   ===================================================== */
.blog-hero {
    text-align: center;
    padding: var(--space-16) 0 var(--space-12);
    position: relative;
}

.blog-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(0, 229, 204, 0.06) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.blog-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    position: relative;
    z-index: 1;
}

.blog-hero h1 .accent {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* =====================================================
   BLOG LISTING - GRID
   ===================================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-8);
    padding-bottom: var(--space-16);
}

.blog-card {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.blog-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-4px);
}

.blog-card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--glass-border);
}

.blog-card__image-placeholder {
    width: 100%;
    height: 200px;
    background: var(--accent-gradient-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    border-bottom: 1px solid var(--glass-border);
}

.blog-card__body {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.blog-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-3);
}

.blog-card__tag {
    background: var(--accent-gradient-subtle);
    color: var(--accent-primary);
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-card__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: var(--space-3);
}

.blog-card:hover .blog-card__title {
    color: var(--accent-primary);
}

.blog-card__excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    margin-bottom: var(--space-4);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-3);
    border-top: 1px solid var(--glass-border);
}

.blog-card__read-more {
    color: var(--accent-primary);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: gap var(--transition-fast);
}

.blog-card:hover .blog-card__read-more {
    gap: var(--space-3);
}

.blog-card__reading-time {
    color: var(--text-dim);
    font-size: 0.8rem;
}

/* =====================================================
   ARTICLE DETAIL
   ===================================================== */
.article-header {
    text-align: center;
    padding: var(--space-12) 0 var(--space-8);
    max-width: 720px;
    margin: 0 auto;
}

.article-header__tag {
    display: inline-block;
    background: var(--accent-gradient-subtle);
    color: var(--accent-primary);
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: var(--space-4);
}

.article-header h1 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--space-5);
}

.article-header__meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    color: var(--text-muted);
    font-size: 0.9rem;
    flex-wrap: wrap;
}

.article-header__meta span {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.article-header__meta .dot {
    width: 3px;
    height: 3px;
    background: var(--text-dim);
    border-radius: 50%;
}

/* =====================================================
   TABLE OF CONTENTS
   ===================================================== */
.toc {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}

.toc__title {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.toc__list {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: toc-counter;
}

.toc__list li {
    counter-increment: toc-counter;
}

.toc__list li a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toc__list li a::before {
    content: counter(toc-counter, decimal-leading-zero);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-dim);
    min-width: 24px;
}

.toc__list li a:hover {
    color: var(--accent-primary);
    background: rgba(0, 229, 204, 0.05);
}

.toc__list li a:hover::before {
    color: var(--accent-primary);
}

/* =====================================================
   ARTICLE CONTENT
   ===================================================== */
.article-content {
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.8;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.article-content h2 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: var(--space-12) 0 var(--space-5);
    padding-top: var(--space-4);
    border-top: 1px solid var(--glass-border);
}

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

.article-content h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--space-8) 0 var(--space-4);
}

.article-content p {
    margin-bottom: var(--space-5);
}

.article-content a {
    color: var(--accent-primary);
    text-decoration: underline;
    text-decoration-color: rgba(0, 229, 204, 0.3);
    text-underline-offset: 3px;
    transition: text-decoration-color var(--transition-fast);
}

.article-content a:hover {
    text-decoration-color: var(--accent-primary);
}

.article-content ul,
.article-content ol {
    padding-left: var(--space-6);
    margin-bottom: var(--space-5);
}

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

.article-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.article-content img {
    width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    margin: var(--space-6) 0;
}

.article-content blockquote {
    border-left: 3px solid var(--accent-primary);
    padding: var(--space-4) var(--space-6);
    margin: var(--space-6) 0;
    background: var(--bg-elevated);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-primary);
    font-style: italic;
}

.article-content code {
    background: var(--bg-surface);
    color: var(--accent-primary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.article-content pre {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    overflow-x: auto;
    margin: var(--space-6) 0;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

/* Article Tables */
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-6) 0;
    font-size: 0.95rem;
}

.article-content th {
    background: var(--bg-surface);
    color: var(--text-primary);
    font-weight: 600;
    text-align: left;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--glass-border);
}

.article-content td {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

.article-content tr:hover td {
    background: var(--bg-elevated);
}

/* =====================================================
   FEATURED SNIPPET BLOCK
   ===================================================== */
.snippet-answer {
    background: var(--bg-elevated);
    border: 1px solid var(--accent-primary);
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin: var(--space-6) 0;
    position: relative;
}

.snippet-answer::before {
    content: '✦ Quick Answer';
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-primary);
    position: absolute;
    top: calc(var(--space-2) * -1);
    left: var(--space-4);
    background: var(--bg-elevated);
    padding: 0 var(--space-2);
}

.snippet-answer p {
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.7;
    margin: 0;
}

/* =====================================================
   FAQ SECTION (ARTICLE)
   ===================================================== */
.article-faq {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--glass-border);
}

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

.faq-item {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--glass-border-hover);
}

.faq-item__question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-display);
    transition: color var(--transition-fast);
}

.faq-item__question:hover {
    color: var(--accent-primary);
}

.faq-item__icon {
    font-size: 1.2rem;
    color: var(--text-dim);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
    margin-left: var(--space-4);
}

.faq-item.open .faq-item__icon {
    transform: rotate(45deg);
    color: var(--accent-primary);
}

.faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq-item.open .faq-item__answer {
    max-height: 500px;
    padding: 0 var(--space-6) var(--space-5);
}

.faq-item__answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
    margin: 0;
}

/* =====================================================
   CTA BLOCK (IN-ARTICLE)
   ===================================================== */
.article-cta {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    text-align: center;
    margin: var(--space-12) 0;
    position: relative;
    overflow: hidden;
}

.article-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
}

.article-cta h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

.article-cta p {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    font-size: 1rem;
}

.article-cta .cta-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--accent-gradient);
    color: #000;
    padding: var(--space-3) var(--space-8);
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-glow);
}

.article-cta .cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong);
}

/* =====================================================
   RELATED POSTS
   ===================================================== */
.related-posts {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--glass-border);
}

.related-posts h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-6);
    text-align: center;
}

.related-posts__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
}

/* =====================================================
   BACK TO BLOG
   ===================================================== */
.back-to-blog {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--space-2) 0;
    transition: color var(--transition-fast);
}

.back-to-blog:hover {
    color: var(--accent-primary);
}

/* =====================================================
   BLOG NAVBAR
   ===================================================== */
.blog-nav {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: var(--z-overlay);
    padding: var(--space-4) 0;
}

.blog-nav__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.blog-nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
}

.blog-nav__logo img {
    height: 32px;
    width: auto;
}

.blog-nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.blog-nav__links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.blog-nav__links a:hover,
.blog-nav__links a.active {
    color: var(--accent-primary);
}

.blog-nav__cta {
    background: var(--accent-gradient);
    color: #000 !important;
    padding: var(--space-2) var(--space-5) !important;
    border-radius: var(--radius-full) !important;
    font-weight: 600 !important;
    font-size: 0.85rem !important;
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 768px) {
    .blog-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .blog-hero {
        padding: var(--space-10) 0 var(--space-8);
    }

    .article-header {
        padding: var(--space-8) 0 var(--space-6);
    }

    .article-content h2 {
        font-size: 1.35rem;
    }

    .article-cta {
        padding: var(--space-8);
    }

    .related-posts__grid {
        grid-template-columns: 1fr;
    }

    .blog-nav__links {
        gap: var(--space-4);
    }

    .blog-nav__links a:not(.blog-nav__cta) {
        display: none;
    }

    .toc {
        padding: var(--space-4);
    }
}

@media (max-width: 480px) {
    .blog-container {
        padding: 0 var(--space-4);
    }

    .article-content {
        font-size: 1rem;
    }

    .blog-card__body {
        padding: var(--space-4);
    }
}