/* ── Article Frontend CSS ────────────────────────────────────────────────────
   Layout trang chi tiết bài viết theo phong cách VnExpress.
   Design tokens: Arial, content-first, structured spacing.
   Tách riêng để dễ scale, tái sử dụng.
   ──────────────────────────────────────────────────────────────────────── */

/* ── Design Tokens ── */
:root {
    --article-font: Arial, Helvetica, sans-serif;
    --article-text-primary: #222222;
    --article-text-secondary: #757575;
    --article-text-tertiary: #4f4f4f;
    --article-text-link: #076db6;
    --article-bg: #ffffff;
    --article-border: #e5e5e5;
    --article-surface-raised: #f4f4f4;
    --article-max-width: 680px;
    --article-font-size-body: 18px;
    --article-font-size-title: 32px;
    --article-font-size-sapo: 18px;
    --article-font-size-caption: 14px;
    --article-font-size-meta: 14px;
    --article-line-height-body: 1.7;
    --article-line-height-title: 1.35;
    --article-spacing-paragraph: 1em;
}

/* ── Article List Page ── */
.article-list-page {
    max-width: 960px;
    margin: 0 auto;
    padding: 30px 20px 60px;
    font-family: var(--article-font);
}

.article-list-page > h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--article-text-primary);
}

/* ── Article Detail Page ── */
.article-detail {
    max-width: 1040px;
    margin: 0 auto;
    padding: 40px 16px 60px;
    font-family: var(--article-font);
    color: var(--article-text-primary);
}

/* ── Two-Column Layout ── */
.article-body {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.article-left {
    flex: 1;
    max-width: var(--article-max-width);
    min-width: 0;
}

.article-sidebar {
    width: 300px;
    flex-shrink: 0;
    position: sticky;
    top: 90px;
}

/* Title */
.article-left > h1 {
    font-size: var(--article-font-size-title);
    font-weight: 700;
    line-height: var(--article-line-height-title);
    margin: 0 0 10px;
    color: var(--article-text-primary);
}

/* Sapo — đoạn mô tả ngắn in đậm dưới title */
.article-left .article-sapo {
    font-family: var(--article-font);
    font-size: var(--article-font-size-sapo);
    font-weight: 700;
    line-height: 1.5;
    color: var(--article-text-primary);
    margin: 0 0 12px;
}

/* Meta: ngày đăng */
.article-left .article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    font-size: var(--article-font-size-meta);
    color: var(--article-text-secondary);
    margin-bottom: 14px;
}

/* Thumbnail figure */
.article-left .article-figure {
    margin: 0 0 20px;
}

.article-left .article-thumbnail {
    width: 100%;
    height: auto;
    display: block;
}

/* Author tag cuối bài — in đậm nghiêng, căn phải */
.article-left .article-author-tag {
    font-family: var(--article-font);
    font-size: 15px;
    text-align: right;
    font-style: italic;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--article-border);
    color: var(--article-text-primary);
}

/* ── Sidebar "Xem nhiều" (VnExpress style) ── */
.sidebar-box {
    background: transparent;
    border: none;
    padding: 0;
}

.sidebar-box__title {
    font-family: var(--article-font);
    font-size: 18px;
    font-weight: 700;
    color: var(--article-text-primary);
    margin: 0 0 12px;
    padding: 0;
    border: none;
}

.sidebar-box__list {
    margin: 0;
    padding: 0;
}

.sidebar-box__item {
    display: block;
    padding: 0 0 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--article-border);
    overflow: hidden;
}

.sidebar-box__item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.sidebar-box__thumb {
    float: left;
    width: 110px;
    height: 66px;
    margin-right: 10px;
    display: block;
    overflow: hidden;
}

.sidebar-box__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sidebar-box__headline {
    margin: 0;
    font-family: var(--article-font);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.4;
    overflow: hidden;
}

.sidebar-box__headline a {
    color: var(--article-text-primary);
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sidebar-box__headline a:hover {
    color: var(--article-text-link);
}

/* ── Article Content — Prose Typography (VnExpress style) ── */
.article-content {
    font-family: var(--article-font);
    font-size: var(--article-font-size-body);
    line-height: var(--article-line-height-body);
    color: var(--article-text-primary);
}

/* Headings */
.article-content h1 {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.35;
    margin: 28px 0 12px;
    color: var(--article-text-primary);
}

.article-content h2 {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.4;
    margin: 24px 0 10px;
    color: var(--article-text-primary);
}

.article-content h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin: 20px 0 8px;
    color: var(--article-text-primary);
}

/* Paragraphs */
.article-content p {
    margin: 0 0 var(--article-spacing-paragraph);
    line-height: var(--article-line-height-body);
}

.article-content p:last-child {
    margin-bottom: 0;
}

/* Images — full width */
.article-content img {
    display: block;
    max-width: 100%;
    width: 100%;
    height: auto;
    margin: 0;
}

.article-content p:has(> img) {
    margin-bottom: 4px;
    text-align: center;
}

/* Caption ảnh — nhỏ, nghiêng, căn giữa */
.article-content p:has(> img) + p,
.article-content p > em:only-child {
    text-align: center;
    font-style: italic;
    font-size: var(--article-font-size-caption);
    color: var(--article-text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

/* Tên tác giả cuối bài trong content — căn phải */
.article-content > h1:last-child,
.article-content > h2:last-child,
.article-content > h3:last-child,
.article-content > p:last-child > strong:only-child {
    display: block;
    text-align: right;
    font-size: 15px;
    font-weight: 700;
    font-style: italic;
    margin-top: 16px;
    color: var(--article-text-primary);
}

/* Lists */
.article-content ol,
.article-content ul {
    padding-left: 24px;
    margin: 0 0 var(--article-spacing-paragraph);
}

.article-content li {
    margin-bottom: 6px;
    line-height: var(--article-line-height-body);
}

/* Blockquote */
.article-content blockquote {
    border-left: 3px solid var(--article-text-link);
    padding: 10px 16px;
    margin: 16px 0;
    background: var(--article-surface-raised);
    color: var(--article-text-tertiary);
    font-style: italic;
    line-height: 1.6;
}

/* Code */
.article-content pre {
    background: var(--article-surface-raised);
    border: 1px solid var(--article-border);
    border-radius: 3px;
    padding: 14px 16px;
    margin: 16px 0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.6;
    overflow-x: auto;
}

/* Links */
.article-content a {
    color: var(--article-text-link);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content a:hover {
    color: #004a80;
}

/* Strong / Em */
.article-content strong {
    font-weight: 700;
}

.article-content em {
    font-style: italic;
}

/* ── Related Articles — Horizontal Scroll ── */
.related-articles {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--article-border);
}

.related-articles h2 {
    font-family: var(--article-font);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--article-text-primary);
}

.article-grid {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 12px;
}

.article-grid::-webkit-scrollbar {
    height: 4px;
}

.article-grid::-webkit-scrollbar-track {
    background: var(--article-surface-raised);
    border-radius: 2px;
}

.article-grid::-webkit-scrollbar-thumb {
    background: var(--article-border);
    border-radius: 2px;
}

.article-grid .article-card {
    min-width: 220px;
    max-width: 220px;
    flex-shrink: 0;
    scroll-snap-align: start;
    border: 1px solid var(--article-border);
    border-radius: 3px;
    overflow: hidden;
    background: var(--article-bg);
    transition: box-shadow 200ms ease;
}

.article-grid .article-card:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.article-grid .article-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-grid .article-card img {
    width: 100%;
    height: 130px;
    object-fit: cover;
    display: block;
}

.article-grid .article-card h3 {
    font-family: var(--article-font);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.4;
    padding: 10px 12px 4px;
    margin: 0;
    color: var(--article-text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-grid .article-card p {
    display: none;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    :root {
        --article-font-size-title: 24px;
        --article-font-size-body: 16px;
        --article-font-size-sapo: 16px;
        --article-max-width: 100%;
    }

    .article-detail {
        padding: 16px 16px 40px;
    }

    .article-body {
        flex-direction: column;
        gap: 24px;
    }

    .article-sidebar {
        width: 100%;
        position: static;
    }

    .article-grid .article-card {
        min-width: 180px;
        max-width: 180px;
    }

    .article-grid .article-card img {
        height: 100px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --article-font-size-title: 28px;
    }

    .article-sidebar {
        width: 260px;
    }
}