/* ===== Blog Styles ===== */
/* These styles complement main.css for blog pages */

/* ===== Blog Page Layout ===== */
.blog-page {
    padding-top: calc(var(--header-height) + var(--space-2xl));
    padding-bottom: var(--space-4xl);
    min-height: 100vh;
}

/* ===== Blog Index Page ===== */
.blog-hero {
    text-align: center;
    padding: var(--space-3xl) 0;
    background: var(--gradient-hero);
    margin-bottom: var(--space-2xl);
}

.blog-hero h1 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-hero p {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Category Filter */
.blog-categories {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-xl);
    padding: 0 var(--space-lg);
}

.category-filter {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

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

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

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-xl);
    padding: 0 var(--space-lg);
}

/* Blog Card */
.blog-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

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

.blog-card-image {
    width: 100%;
    height: 180px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.blog-card-image svg {
    width: 64px;
    height: 64px;
    color: rgba(255, 255, 255, 0.9);
}

.blog-card-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 0, 0, 0.1) 100%);
}

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

.blog-card-category {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-sm);
    width: fit-content;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-card-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

.blog-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.blog-card-title a:hover {
    color: var(--color-primary);
}

.blog-card-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
    flex: 1;
}

.blog-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

.blog-card-date {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.blog-card-date svg {
    width: 14px;
    height: 14px;
}

.blog-card-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: gap var(--transition-fast);
}

.blog-card-link:hover {
    gap: var(--space-sm);
}

.blog-card-link svg {
    width: 16px;
    height: 16px;
}

/* ===== Blog Post Page ===== */
.blog-post-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

/* Blog Post Layout (Left Panel + Content) */
.blog-post-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: var(--space-2xl);
    align-items: start;
}

.blog-post-layout .blog-post-container {
    max-width: none;
    margin: 0;
    padding: 0;
}

.blog-left-panel {
    position: relative;
}

.blog-left-panel-inner {
    position: sticky;
    top: calc(var(--header-height) + var(--space-lg));
    max-height: calc(100vh - var(--header-height) - var(--space-2xl));
    overflow: auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

.blog-left-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.blog-left-panel-title {
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.95rem;
    letter-spacing: 0.2px;
}

.blog-left-panel-all {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.blog-left-panel-all:hover {
    text-decoration: underline;
}

.blog-left-panel-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.blog-left-panel-link {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    border: 1px solid transparent;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.blog-left-panel-link:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border);
}

.blog-left-panel-link.active {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

.blog-left-panel-link-title {
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.3;
}

.blog-left-panel-link-meta {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    line-height: 1.2;
}

/* Post Header */
.blog-post-header {
    margin-bottom: var(--space-2xl);
    text-align: center;
}

@media (max-width: 1024px) {
    .blog-post-layout {
        grid-template-columns: 1fr;
    }

    .blog-left-panel-inner {
        position: static;
        max-height: none;
        margin-bottom: var(--space-xl);
    }
}

.blog-post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.blog-post-category {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-post-date {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.blog-post-date svg {
    width: 16px;
    height: 16px;
}

.blog-post-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.3;
    margin-bottom: var(--space-lg);
}

.blog-post-excerpt {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 650px;
    margin: 0 auto;
}

/* Featured Image */
.blog-post-image {
    width: 100%;
    height: 400px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.blog-post-image svg {
    width: 120px;
    height: 120px;
    color: rgba(255, 255, 255, 0.9);
}

.blog-post-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* Blog Content */
.blog-post-content {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text);
}

.blog-post-content h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text);
    margin: var(--space-2xl) 0 var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-border-light);
}

.blog-post-content h3 {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-text);
    margin: var(--space-xl) 0 var(--space-md);
}

.blog-post-content p {
    margin-bottom: var(--space-lg);
}

.blog-post-content ul,
.blog-post-content ol {
    margin: var(--space-lg) 0;
    padding-left: var(--space-xl);
}

.blog-post-content ul {
    list-style: disc;
}

.blog-post-content ol {
    list-style: decimal;
}

.blog-post-content li {
    margin-bottom: var(--space-sm);
    padding-left: var(--space-sm);
}

.blog-post-content li::marker {
    color: var(--color-primary);
}

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

.blog-post-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-post-content a:hover {
    text-decoration: none;
}

/* Code Blocks */
.blog-post-content pre {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    overflow-x: auto;
    margin: var(--space-xl) 0;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.blog-post-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-code-bg);
    padding: 0.125em 0.375em;
    border-radius: var(--radius-sm);
    color: var(--color-primary);
}

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

/* Info Boxes */
.info-box {
    background: var(--color-primary-light);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin: var(--space-xl) 0;
}

.info-box h4 {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.info-box p {
    margin-bottom: 0;
    color: var(--color-text-secondary);
}

.warning-box {
    background: rgba(251, 188, 4, 0.1);
    border-left-color: var(--color-warning);
}

.warning-box h4 {
    color: #b8860b;
}

.success-box {
    background: rgba(52, 168, 83, 0.1);
    border-left-color: var(--color-success);
}

.success-box h4 {
    color: var(--color-success);
}

/* Diagrams */
.diagram {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin: var(--space-xl) 0;
    text-align: center;
}

.diagram-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.diagram svg {
    max-width: 100%;
    height: auto;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.feature-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-align: center;
    transition: all var(--transition-fast);
}

.feature-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.feature-item-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
    color: var(--color-primary);
}

.feature-item-icon svg {
    width: 24px;
    height: 24px;
}

.feature-item h4 {
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.feature-item p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Steps */
.steps {
    margin: var(--space-xl) 0;
    counter-reset: step-counter;
}

.step {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    position: relative;
}

.step::before {
    counter-increment: step-counter;
    content: counter(step-counter);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 19px;
    top: 48px;
    bottom: -16px;
    width: 2px;
    background: var(--color-border);
}

.step-content h4 {
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.step-content p {
    margin: 0;
    color: var(--color-text-secondary);
}

/* Comparison Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-xl) 0;
    font-size: 0.9rem;
}

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

.comparison-table th {
    background: var(--color-bg-secondary);
    font-weight: 600;
    color: var(--color-text);
}

.comparison-table tr:hover td {
    background: var(--color-surface-hover);
}

.comparison-table .check {
    color: var(--color-success);
}

.comparison-table .cross {
    color: var(--color-error);
}

/* Blog CTA */
.blog-cta {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    margin: var(--space-2xl) 0;
    color: white;
}

.blog-cta h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.blog-cta p {
    margin-bottom: var(--space-lg);
    opacity: 0.9;
}

.blog-cta .btn {
    margin: 0 var(--space-sm);
}

.blog-cta .btn-primary {
    background: white;
    color: var(--color-primary);
}

.blog-cta .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

.blog-cta .btn-secondary {
    background: transparent;
    border: 2px solid white;
    color: white;
}

.blog-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Blog Footer */
.blog-post-footer {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.blog-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.blog-nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-primary);
    font-weight: 500;
    transition: gap var(--transition-fast);
}

.blog-nav-link:hover {
    gap: var(--space-md);
}

/* Tags */
.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.blog-tag {
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.blog-tag:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* Author Box */
.author-box {
    display: flex;
    gap: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin: var(--space-2xl) 0;
}

.author-avatar {
    width: 80px;
    height: 80px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.author-avatar svg {
    width: 40px;
    height: 40px;
    color: white;
}

.author-info h4 {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.author-info p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

/* Reading Progress */
.reading-progress {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-border-light);
    z-index: 999;
}

.reading-progress-bar {
    height: 100%;
    background: var(--color-primary);
    width: 0%;
    transition: width 50ms linear;
}

/* TOC */
.blog-toc {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.blog-toc h4 {
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.blog-toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.blog-toc li {
    margin-bottom: var(--space-sm);
    padding-left: 0;
}

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

.blog-toc a:hover {
    color: var(--color-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .blog-hero h1 {
        font-size: 2rem;
    }
    
    .blog-hero p {
        font-size: 1rem;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-post-title {
        font-size: 1.75rem;
    }
    
    .blog-post-excerpt {
        font-size: 1rem;
    }
    
    .blog-post-content h2 {
        font-size: 1.5rem;
    }
    
    .blog-post-image {
        height: 250px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .author-box {
        flex-direction: column;
        text-align: center;
    }
    
    .author-avatar {
        margin: 0 auto;
    }
    
    .blog-cta .btn {
        display: block;
        margin: var(--space-sm) 0;
    }
}