/* ============================================
   Article Page Styles
   ============================================ */

/* Article Container */
.article {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-2xl);
}

/* Article Header */
.article-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.article-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.article-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-date {
    color: var(--color-text-secondary);
}

.article-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.article-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Table of Contents */
.table-of-contents {
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    border-left: 4px solid var(--color-primary);
}

.table-of-contents h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.table-of-contents ul {
    list-style: none;
}

.table-of-contents li {
    margin-bottom: var(--spacing-sm);
}

.table-of-contents a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    display: block;
    padding: var(--spacing-xs) 0;
    font-size: 0.9375rem;
}

.table-of-contents a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* Article Sections */
.article-section {
    margin-bottom: var(--spacing-2xl);
}

.article-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-bg-tertiary);
}

.article-section h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-xl);
    color: var(--color-text-primary);
}

.article-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    color: var(--color-text-primary);
}

.article-section p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.article-section ul,
.article-section ol {
    margin-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.article-section li {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

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

/* Feature Box */
.feature-box {
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

.feature-box h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.feature-box p {
    margin-bottom: 0;
}

/* Comparison Table */
.comparison-table {
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

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

.comparison-table th {
    background-color: var(--color-primary);
    color: white;
    font-weight: 600;
    font-size: 0.9375rem;
}

.comparison-table td {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

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

/* Code Block */
.code-block {
    background-color: #1E293B;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--spacing-lg) 0;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: #0F172A;
    border-bottom: 1px solid #334155;
}

.code-header span {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
}

.copy-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background-color: var(--color-border);
    color: var(--color-text-primary);
}

.copy-btn.copied {
    background-color: var(--color-success-bg);
    color: var(--color-success);
    border-color: var(--color-success);
}

.code-block pre {
    padding: var(--spacing-lg);
    overflow-x: auto;
}

.code-block code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: #E2E8F0;
}

.code-block .json-key {
    color: #60A5FA;
}

.code-block .json-string {
    color: #34D399;
}

.code-block .json-number {
    color: #FBBF24;
}

.code-block .json-boolean {
    color: #A78BFA;
}

.code-block .json-null {
    color: #94A3B8;
}

.code-block .json-comment {
    color: #6B7280;
    font-style: italic;
}

/* Migration Tip */
.migration-tip {
    background-color: var(--color-info-bg);
    border-left: 4px solid var(--color-info);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.migration-tip h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-info);
    margin-bottom: var(--spacing-sm);
}

.migration-tip p {
    margin-bottom: 0;
    font-size: 0.9375rem;
}

/* Conclusion Section */
.conclusion {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg-secondary) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.conclusion h2 {
    border-bottom-color: var(--color-primary);
}

/* Article Footer */
.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.author-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary-light);
    border-radius: var(--radius-full);
}

.author-avatar svg {
    width: 28px;
    height: 28px;
}

.author-details {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.author-bio {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.share-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.share-btn:hover {
    background-color: var(--color-border);
    color: var(--color-text-primary);
}

.share-btn svg {
    flex-shrink: 0;
}

/* Related Articles */
.related-articles {
    margin-top: var(--spacing-2xl);
}

.related-articles h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.related-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    transition: all var(--transition-base);
}

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

.related-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary-light);
    border-radius: var(--radius-lg);
}

.related-icon svg {
    width: 32px;
    height: 32px;
}

.related-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.related-card p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-info));
    z-index: 1000;
    transition: width 0.1s ease;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-4px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .article {
        padding: var(--spacing-lg);
        border-radius: 0;
    }

    .article-title {
        font-size: 1.875rem;
    }

    .article-subtitle {
        font-size: 1.0625rem;
    }

    .article-section h2 {
        font-size: 1.5rem;
    }

    .article-section h3 {
        font-size: 1.1875rem;
    }

    .article-footer {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .author-info {
        flex-direction: column;
    }

    .comparison-table {
        margin-left: calc(-1 * var(--spacing-lg));
        margin-right: calc(-1 * var(--spacing-lg));
        width: calc(100% + 2 * var(--spacing-lg));
    }

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

    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Print Styles */
@media print {
    .header,
    .breadcrumb,
    .footer,
    .article-footer,
    .back-to-top,
    .scroll-progress,
    .tools-tab {
        display: none !important;
    }

    .article {
        box-shadow: none;
        border: none;
        padding: 0;
    }

    .code-block {
        background-color: #F8FAFC;
    }

    .code-block code {
        color: var(--color-text-primary);
    }
}

/* ============================================
   Article List Page Styles
   ============================================ */

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.page-header .page-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.page-header .page-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.articles-list {
    margin-bottom: var(--spacing-2xl);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.article-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

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

.article-card-link {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-xl);
    text-decoration: none;
    color: inherit;
}

.article-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.article-card-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    line-height: 1.4;
}

.article-card-excerpt {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

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

.read-time {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.article-arrow {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.article-card:hover .article-arrow {
    transform: translateX(4px);
}

/* Responsive Design for Article List */
@media (max-width: 768px) {
    .page-header .page-title {
        font-size: 2rem;
    }

    .page-header .page-description {
        font-size: 1rem;
    }

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

    .article-card-title {
        font-size: 1.25rem;
    }
}