/* ============================================================
   Articles �?文章列表 / 详情 / 导航�?   紫色 SaaS 风格 �?cards with hover lift, read-progress, sidebar
   ============================================================ */

/* --- Page Hero (页面�? --- */
.articles-hero {
    background: var(--bg-light);
    padding: 80px var(--gutter) 56px;
    text-align: center;
    border-bottom: 1px solid var(--gray-100);
    position: relative;
    overflow: hidden;
}
.articles-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(13, 148, 136, 0.04) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
}
.articles-hero .container { position: relative; z-index: 1; }
.articles-hero .section-badge { margin-bottom: 16px; }
.articles-hero h1 {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}
.articles-hero .section-kicker {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary-700);
    background: var(--white);
    border: 1px solid var(--primary-200);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.articles-hero p {
    font-size: 1rem;
    color: var(--gray-600);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

/* --- Article List Grid (3 col) --- */
.articles-list {
    background: var(--white);
    padding: 64px 0;
}
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.articles-grid.is-2col { grid-template-columns: repeat(2, 1fr); }

/* --- Article Card --- */
.article-card {
    display: flex;
    flex-direction: column;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--t-base);
    text-decoration: none;
    color: inherit;
    border-bottom: 1px solid var(--gray-100);
}
.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
    color: inherit;
}
.article-card-thumb {
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, var(--bg-light), var(--primary-100));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.article-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.article-card-thumb .thumb-fallback {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-500);
    opacity: 0.6;
}
.article-card-thumb .thumb-cat {
    position: absolute;
    top: 12px; left: 12px;
    background: var(--white);
    color: var(--primary-700);
    border: 1px solid var(--primary-200);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.6875rem;
    font-weight: 600;
    font-family: var(--font-mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.article-card-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.article-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: 10px;
    font-family: var(--font-mono);
}
.article-card-meta .meta-dot { color: var(--gray-300); }
.article-card-meta .cat-tag {
    color: var(--primary-700);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.article-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
    line-height: 1.4;
    transition: color var(--t-fast);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-card:hover h3 { color: var(--primary-700); }
.article-card-excerpt {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.65;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--gray-100);
    font-size: 0.75rem;
    color: var(--gray-500);
    font-family: var(--font-mono);
}
.article-card-read {
    color: var(--primary-700);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--t-fast);
}
.article-card:hover .article-card-read { gap: 8px; }

/* --- Article Single (detail page) --- */
.article-single {
    background: var(--white);
    padding: 0 0 80px;
}

/* Reading progress bar (top fixed) */
.reading-progress {
    position: fixed;
    top: 64px;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-700), var(--primary-500));
    z-index: 99;
    width: 0%;
    transition: width 80ms ease-out;
    box-shadow: 0 1px 4px rgba(13, 148, 136, 0.3);
}
.reading-progress-pct {
    position: fixed;
    top: 70px;
    right: 16px;
    z-index: 99;
    background: var(--gray-900);
    color: var(--white);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.2s, transform 0.2s;
    pointer-events: none;
    z-index: 99;
}
.reading-progress-pct.is-visible {
    opacity: 0.92;
    transform: translateY(0);
}

/* Featured image (full-bleed hero) */
.article-featured {
    position: relative;
    width: 100%;
    height: clamp(280px, 38vw, 480px);
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-900), var(--primary-600));
    margin-top: 0;
    margin-bottom: 0;
}
.article-featured img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.article-featured-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, transparent 50%, rgba(0,0,0,0.3) 100%);
    pointer-events: none;
}

/* Article header (title + meta) */
.article-header-wrap {
    padding-top: 48px;
    padding-bottom: 32px;
}
.article-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 0;
    padding: 0 0 32px;
    border-bottom: 1px solid var(--gray-200);
}
.article-breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--gray-500);
    font-family: var(--font-mono);
    margin-bottom: 16px;
}
.article-breadcrumb a { color: var(--gray-500); border-color: transparent; }
.article-breadcrumb a:hover { color: var(--primary-700); }
.article-breadcrumb .bc-sep { color: var(--gray-300); }
.article-header .article-cat {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary-700);
    background: var(--bg-light);
    border: 1px solid var(--primary-200);
    padding: 4px 14px;
    margin-bottom: 20px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 600;
    border-radius: var(--radius-full);
}
.article-header h1 {
    font-size: clamp(1.875rem, 4.5vw, 2.625rem);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.025em;
    text-wrap: balance;
}
.article-excerpt {
    font-size: 1.0625rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin: 0 auto 24px;
    max-width: 640px;
    text-align: center;
}
.article-header .article-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px 16px;
    color: var(--gray-500);
    font-size: 0.8125rem;
    font-family: var(--font-mono);
}
.article-header .article-meta .meta-sep { color: var(--gray-300); }
.article-header .article-meta a { color: var(--gray-600); border-color: transparent; }
.article-header .article-meta a:hover { color: var(--primary-700); }
.meta-author {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.meta-avatar {
    width: 22px; height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-700), var(--primary-500));
    color: var(--white);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.6875rem;
}
.meta-name { font-weight: 500; color: var(--gray-800); }
.meta-reading, .meta-views {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.meta-reading svg, .meta-views svg { opacity: 0.6; }

/* 2-column body grid: content + TOC */
.article-body-grid {
    background: var(--white);
}
.article-body-wrap {
    display: grid;
    grid-template-columns: 56px minmax(0, 760px) 280px;
    gap: 32px;
    align-items: start;
    max-width: 1200px;
    padding-top: 48px;
    padding-bottom: 48px;
    justify-content: center;
}

/* Floating action rail (left) */
.article-actions {
    position: sticky;
    top: 96px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}
.article-action {
    width: 40px; height: 40px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--gray-500);
    text-decoration: none;
    transition: all var(--t-fast);
    position: relative;
    font-family: var(--font-mono);
}
.article-action:hover {
    color: var(--primary-700);
    border-color: var(--primary-300);
    background: var(--primary-50);
    transform: translateY(-1px);
}
.article-action:active {
    transform: scale(0.94);
}
.article-action.is-liked {
    color: var(--primary-700);
    background: var(--primary-50);
    border-color: var(--primary-300);
}
.article-action.is-liked svg { fill: currentColor; }
.article-action svg { width: 18px; height: 18px; }
.article-action-count {
    font-size: 0.625rem;
    color: var(--gray-500);
    margin-top: 1px;
    line-height: 1;
    font-weight: 600;
}
.article-action.is-liked .article-action-count { color: var(--primary-700); }
.article-action.is-bookmarked { color: var(--primary-700); }
.article-action.is-bookmarked svg { fill: currentColor; }
.article-action-tooltip {
    position: absolute;
    left: 48px;
    background: var(--gray-900);
    color: var(--white);
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 5;
}
.article-action:hover .article-action-tooltip { opacity: 1; }

/* Article content (main column) */
.article-content {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--gray-800);
}
.article-content > * { margin-bottom: 1.5em; }
.article-content h2 {
    font-size: 1.625rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-top: 2.2em;
    margin-bottom: 0.8em;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-200);
    position: relative;
    scroll-margin-top: 96px;
}
.article-content h2::before {
    content: '§';
    color: var(--primary-500);
    margin-right: 8px;
    font-family: var(--font-mono);
    font-weight: 600;
    opacity: 0.5;
}
.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-top: 1.8em;
    margin-bottom: 0.6em;
    scroll-margin-top: 96px;
    position: relative;
}
.article-content h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--primary-700);
    margin-top: 1.5em;
    margin-bottom: 0.4em;
    scroll-margin-top: 96px;
}
.article-content p { color: var(--gray-700); }
.article-content a {
    color: var(--primary-700);
    text-decoration: none;
    border-bottom: 1px solid var(--primary-200);
    transition: all var(--t-fast);
}
.article-content a:hover { background: var(--bg-light); border-bottom-color: var(--primary-500); }
.article-content ul, .article-content ol {
    padding-left: 1.5em;
    color: var(--gray-700);
}
.article-content li { margin-bottom: 0.5em; }
.article-content blockquote {
    border-left: 3px solid var(--primary-500);
    background: var(--bg-light);
    padding: 16px 20px;
    margin: 1.5em 0;
    color: var(--gray-700);
    font-style: italic;
    border-radius: 0 var(--radius) var(--radius) 0;
}
.article-content blockquote p:last-child { margin-bottom: 0; }
.article-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--primary-700);
}
.article-content pre {
    background: var(--gray-900);
    color: #E5E7EB;
    padding: 16px 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    position: relative;
}
.article-content pre::before {
    content: 'CODE';
    position: absolute;
    top: 8px; right: 12px;
    font-size: 0.625rem;
    color: var(--gray-500);
    letter-spacing: 0.12em;
    font-weight: 600;
}
.article-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}
.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 1em 0;
}
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    font-size: 0.9375rem;
}
.article-content th, .article-content td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--gray-200);
    text-align: left;
}
.article-content th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--gray-800);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* TOC (right sticky) */
.article-toc {
    position: sticky;
    top: 96px;
    align-self: start;
}
.article-toc-sticky {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 16px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}
.article-toc-head {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--gray-500);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--gray-200);
}
.article-toc-head svg { color: var(--primary-500); }
.article-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.article-toc-list ol { list-style: none; padding-left: 16px; margin: 4px 0 4px 0; }
.article-toc-list li { margin: 0; }
.article-toc-link {
    display: block;
    padding: 6px 8px 6px 12px;
    color: var(--gray-500);
    font-size: 0.8125rem;
    line-height: 1.45;
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all var(--t-fast);
    border-bottom: none;
    position: relative;
}
.article-toc-link:hover {
    color: var(--gray-800);
    background: var(--bg-light);
}
.article-toc-link.is-h2 {
    font-weight: 500;
}
.article-toc-link.is-h3 {
    padding-left: 24px;
    font-size: 0.75rem;
    color: var(--gray-500);
}
.article-toc-link.is-h3:hover { color: var(--gray-700); }
.article-toc-link.is-active {
    color: var(--primary-700);
    border-left-color: var(--primary-600);
    background: var(--primary-50);
    font-weight: 600;
}
.article-toc-foot {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    gap: 8px;
}
.article-toc-progress {
    flex: 1;
    height: 4px;
    background: var(--gray-100);
    border-radius: 2px;
    overflow: hidden;
}
.article-toc-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-600), var(--primary-400));
    transition: width 0.3s ease;
}
.article-toc-progress-label {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--gray-500);
    font-weight: 600;
    min-width: 32px;
    text-align: right;
}

/* Tags wrap */
.article-tags-wrap {
    max-width: 880px;
    margin: 0 auto;
    padding: 24px var(--gutter) 0;
}
.article-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: var(--bg-light);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}
.article-tags-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--gray-500);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-right: 4px;
}
.article-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: var(--white);
    color: var(--primary-700);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    text-decoration: none;
    transition: all var(--t-fast);
}
.article-tag:hover {
    background: var(--primary-700);
    color: var(--white);
    border-color: var(--primary-700);
}
.article-tag::before {
    content: '#';
    opacity: 0.5;
    margin-right: 4px;
}

/* Author footer card */
.article-footer-wrap {
    max-width: 880px;
    margin: 32px auto 0;
    padding: 0 var(--gutter);
}
.article-footer {
    background: linear-gradient(135deg, var(--white) 0%, var(--bg-light) 100%);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}
.article-footer-author {
    display: flex;
    align-items: center;
    gap: 16px;
    text-decoration: none;
    color: inherit;
    border: none;
    flex: 1;
    min-width: 280px;
}
.article-footer-author:hover { color: inherit; border-color: transparent; }
.article-footer-author .avatar {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-700), var(--primary-500));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-family: var(--font-display);
    font-size: 1.375rem;
    flex-shrink: 0;
}
.article-footer-author .author-name {
    font-weight: 600;
    color: var(--gray-800);
    font-size: 1rem;
}
.article-footer-author .author-role {
    font-size: 0.8125rem;
    color: var(--gray-500);
    font-family: var(--font-mono);
}
.article-footer-author .author-meta {
    font-size: 0.75rem;
    color: var(--gray-400);
    font-family: var(--font-mono);
    margin-top: 4px;
}

.article-share {
    display: flex;
    align-items: center;
    gap: 6px;
}
.article-share-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--gray-500);
    letter-spacing: 0.08em;
    margin-right: 4px;
}
.article-share-btn {
    width: 36px; height: 36px;
    background: var(--white);
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--t-fast);
}
.article-share-btn svg { width: 16px; height: 16px; }
.article-share-btn:hover {
    background: var(--primary-700);
    color: var(--white);
    border-color: var(--primary-700);
    transform: translateY(-2px);
}

/* Prev / next nav */
.article-nav-wrap {
    max-width: 880px;
    margin: 24px auto 0;
    padding: 0 var(--gutter);
}
.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.article-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--gray-700);
    transition: all var(--t-fast);
}
.article-nav-item:hover {
    border-color: var(--primary-300);
    box-shadow: var(--shadow);
    color: var(--gray-800);
    transform: translateY(-1px);
}
.article-nav-item.article-nav-next { justify-content: flex-end; text-align: right; }
.article-nav-item > div { display: flex; flex-direction: column; gap: 4px; min-width: 0; flex: 1; }
.article-nav-item .article-nav-arrow {
    font-size: 1.25rem;
    color: var(--primary-700);
    font-weight: 700;
    flex-shrink: 0;
}
.article-nav-item .label {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.article-nav-item .title {
    display: block;
    color: var(--gray-800);
    font-weight: 600;
    font-size: 0.9375rem;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.article-nav-item:hover .title { color: var(--primary-700); }

/* Related articles header */
.related-articles-head {
    text-align: center;
    margin-bottom: 32px;
}
.related-articles-head .section-kicker {
    color: var(--primary-700);
}
.related-articles-head h3 {
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-top: 8px;
    font-family: var(--font-display);
    font-weight: 600;
}


/* --- Article Tags (OLD - moved up to new design) --- */
/* (old tags/footer/share/nav styles moved to new design above) */

/* --- Related Articles --- */
.related-articles {
    background: var(--bg-light);
    padding: 56px 0;
    border-top: 1px solid var(--gray-100);
}
.related-articles h3 {
    font-size: 1.25rem;
    text-align: center;
    margin-bottom: 32px;
    color: var(--gray-800);
}

/* --- Pagination --- */
.articles-pagination {
    margin-top: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}
.articles-pagination a, .articles-pagination span {
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    color: var(--gray-700);
    text-decoration: none;
    transition: all var(--t-fast);
}
.articles-pagination a:hover {
    background: var(--primary-700);
    color: var(--white);
    border-color: var(--primary-700);
}
.articles-pagination .current {
    background: var(--primary-700);
    color: var(--white);
    border-color: var(--primary-700);
}
.articles-pagination .gap { border: none; background: transparent; }

/* --- Category Filter (chips) --- */
.articles-filter {
    background: var(--white);
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-100);
    position: sticky;
    top: 64px;
    z-index: 10;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.9);
}
.articles-filter-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    justify-content: center;
}
.articles-filter .filter-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-right: 8px;
}
.articles-filter a, .articles-filter span {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    color: var(--gray-700);
    font-size: 0.8125rem;
    text-decoration: none;
    transition: all var(--t-fast);
    font-weight: 500;
}
.articles-filter a:hover {
    background: var(--bg-light);
    border-color: var(--primary-300);
    color: var(--primary-700);
}
.articles-filter .is-active {
    background: var(--primary-700);
    border-color: var(--primary-700);
    color: var(--white);
}

/* --- Reading Progress Bar (single.php) --- */
/* .reading-progress is defined at the top of the file (Article Single section) */

/* --- Responsive --- */
@media (max-width: 1024px) {
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .article-body-wrap { grid-template-columns: 56px minmax(0, 760px); }
    .article-toc { display: none; }
}
@media (max-width: 720px) {
    .articles-hero { padding: 56px var(--gutter) 40px; }
    .articles-list { padding: 40px 0; }
    .articles-grid { grid-template-columns: 1fr; gap: 16px; }
    .article-card-body { padding: 16px; }
    .article-card h3 { font-size: 1rem; }
    .article-header h1 { font-size: 1.625rem; }
    .article-content { font-size: 1rem; }
    .article-content h2 { font-size: 1.25rem; }
    .article-content h3 { font-size: 1.125rem; }
    .article-body-wrap { grid-template-columns: 1fr; gap: 0; padding-top: 32px; padding-bottom: 32px; }
    .article-actions {
        position: static;
        flex-direction: row;
        justify-content: center;
        margin-bottom: 24px;
        padding: 12px;
        background: var(--bg-light);
        border-radius: var(--radius);
    }
    .article-action-tooltip { display: none; }
    .article-footer { flex-direction: column; align-items: flex-start; }
    .article-share { width: 100%; }
    .article-nav-wrap .article-nav { grid-template-columns: 1fr; }
    .article-nav-wrap .article-nav .article-nav-next { text-align: left; }
    .articles-filter { top: 56px; }
    .article-featured { height: 200px; }
    .reading-progress-pct { display: none; }
    .related-articles-head h3 { font-size: 1.25rem; }
}

/* Print styles */
@media print {
    .site-header,
    .article-actions,
    .article-toc,
    .article-share,
    .article-featured,
    .reading-progress,
    .reading-progress-pct,
    .related-articles,
    .fixed-bar,
    .site-footer { display: none !important; }
    .article-single { padding: 0; }
    .article-header-wrap { padding: 24px 0; }
    .article-body-wrap { display: block; }
    .article-content { font-size: 12pt; line-height: 1.6; color: #000; }
    .article-content h2 { page-break-after: avoid; margin-top: 18pt; }
    .article-content h3 { page-break-after: avoid; }
    .article-content a { color: #000; border-bottom: none; }
    .article-tags-wrap, .article-footer-wrap, .article-nav-wrap { page-break-before: always; }
}