/* Site Header */
.site-header {
    background: var(--header-bg);
    border-bottom: var(--header-border);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--header-shadow);
}

.site-header::after {
    content: '';
    display: block;
    height: 0;
    background: var(--header-decoration);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.site-logo {
    font-size: var(--logo-font-size);
    font-weight: var(--logo-font-weight);
    color: var(--color-primary);
    text-decoration: none;
    font-family: var(--font-family-heading);
    text-transform: var(--logo-text-transform);
    letter-spacing: var(--logo-letter-spacing);
}

.site-logo:hover {
    color: var(--color-primary-hover);
}

.main-nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-text-muted);
    font-weight: var(--nav-link-font-weight);
    font-size: 0.9375rem;
    text-transform: var(--nav-link-text-transform);
    letter-spacing: var(--nav-link-letter-spacing);
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* Site Footer */
.site-footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
    border-top: var(--footer-border);
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--footer-accent);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-link {
    color: var(--footer-text);
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--footer-accent);
}

.footer-copy {
    font-size: 0.8125rem;
}

/* Main Content */
.site-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* Article Card */
.article-card {
    background-color: var(--color-surface);
    border: var(--card-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.article-card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: var(--card-transform-hover);
}

.article-card-image img {
    width: 100%;
    height: var(--card-image-height);
    object-fit: cover;
}

.article-card-content {
    padding: var(--card-padding);
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.article-card-category {
    color: var(--color-primary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.article-card-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-card-title a {
    color: var(--color-text);
}

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

.article-card-excerpt {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Article Grid */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

/* Layout with Sidebar */
.home-layout,
.articles-layout {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--spacing-2xl);
    align-items: start;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-xl));
}

.sidebar-section {
    margin-top: var(--spacing-xl);
}

.sidebar-title {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

/* Category Nav */
.category-nav-title {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

.category-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.category-nav-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text-muted);
    border-radius: calc(var(--border-radius) / 2);
    font-size: 0.9375rem;
    transition: all 0.2s ease;
}

.category-nav-link:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

/* Tag Badge & Cloud */
.tag-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--tag-bg);
    color: var(--color-text-muted);
    border: var(--tag-border);
    border-radius: var(--tag-radius);
    font-size: var(--tag-font-size);
    transition: all 0.2s ease;
}

.tag-badge:hover {
    background-color: var(--color-primary);
    color: var(--color-surface);
    border-color: var(--color-primary);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0 var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--pagination-radius);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: all 0.2s ease;
}

.pagination-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pagination-current {
    background-color: var(--pagination-active-bg);
    color: var(--pagination-active-text);
    border-color: var(--pagination-active-bg);
}

/* Article Detail */
.article-detail {
    max-width: var(--max-width-article);
    margin: 0 auto;
}

.article-header {
    margin-bottom: var(--spacing-xl);
}

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

.article-category {
    color: var(--color-primary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8125rem;
    letter-spacing: 0.05em;
}

.article-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.article-excerpt {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.article-author-info {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

.article-featured-image {
    margin-bottom: var(--spacing-xl);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.article-featured-image img {
    width: 100%;
    height: auto;
}

/* Prose (article content) */
.prose h2 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.prose h3 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

.prose p {
    margin-bottom: var(--spacing-md);
}

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

.prose li {
    margin-bottom: var(--spacing-xs);
}

.prose blockquote {
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    background-color: var(--color-primary-light);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-style: italic;
    color: var(--color-text-muted);
}

.prose pre {
    margin: var(--spacing-lg) 0;
}

.prose img {
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

.prose a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Article Tags */
.article-tags {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.tags-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* Author Page */
.author-profile {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background-color: var(--color-surface);
    border: var(--card-border);
    border-radius: var(--border-radius);
}

.author-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

.author-bio {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.author-links {
    display: flex;
    gap: var(--spacing-md);
}

.author-link {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Not Found */
.not-found {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.not-found-title {
    font-size: 6rem;
    color: var(--color-primary);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.not-found-message {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.not-found-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-xl);
    background-color: var(--color-primary);
    color: var(--color-surface);
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: background-color 0.2s ease;
}

.not-found-link:hover {
    background-color: var(--color-primary-hover);
    color: var(--color-surface);
}

/* Page Titles */
.page-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
}

.page-description {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-lg);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

/* Language Switcher */
.language-switcher {
    position: relative;
}

.language-select {
    appearance: none;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: calc(var(--border-radius) / 2);
    padding: var(--spacing-xs) var(--spacing-lg) var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
}

/* Language Picker */
.language-picker-section {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

.language-picker-title {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-xs);
    text-align: center;
}

.language-picker-subtitle {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.language-picker-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-sm);
}

.language-picker-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all 0.2s ease;
    background: var(--color-surface);
}

.language-picker-item:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.language-picker-item.active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-surface);
}

.language-picker-item.active .language-native,
.language-picker-item.active .language-name {
    color: var(--color-surface);
}

.language-native {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.3;
}

.language-name {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.125rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }

    .site-header {
        height: auto;
        padding: var(--spacing-sm) 0;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .site-logo {
        font-size: 1rem;
        white-space: nowrap;
    }

    .main-nav {
        gap: var(--spacing-sm);
        width: 100%;
    }

    .nav-link {
        font-size: 0.8125rem;
    }

    .language-select {
        font-size: 0.75rem;
        padding: 0.125rem var(--spacing-lg) 0.125rem var(--spacing-xs);
    }

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

    .sidebar {
        position: static;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        align-items: center;
    }

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

    .article-title {
        font-size: 1.5rem;
    }

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

    .article-meta {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .article-tags {
        flex-wrap: wrap;
    }

    .author-profile {
        flex-direction: column;
        text-align: center;
    }

    .language-picker-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pagination {
        gap: 0.125rem;
    }

    .pagination-link {
        min-width: 2rem;
        height: 2rem;
        font-size: 0.75rem;
    }

    .page-title {
        font-size: 1.375rem;
    }

    .main-content {
        padding: var(--spacing-md) 0;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .not-found-title {
        font-size: 3rem;
    }
}