/* ══ ARTICLE LAYOUT ══ */
.article-layout {
    max-width: 1280px;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 3.5rem;
    align-items: start;
}

/* ── Article header ── */
.article-header {
    margin-bottom: 2.5rem;
}

.article-cats {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.art-cat {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    background: var(--blue-light);
    color: var(--blue-dark);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.22rem 0.7rem;
    border-radius: 20px;
    border: 1px solid rgba(var(--rgb-primary), 0.2);
    text-decoration: none;
    transition: var(--transition);
}

.art-cat:hover {
    background: var(--blue);
    color: white;
}

.article-title {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.8rem;
    color: var(--gray-400);
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.author-wrap {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--blue), var(--blue-mid));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
    overflow: hidden;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-name {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.82rem;
}

/* Featured image */
.feat-img {
    width: 100%;
    aspect-ratio: 16/7;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: linear-gradient(135deg, var(--blue-light), #b8d8f8);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    margin-bottom: 2rem;
    position: relative;
}

.feat-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feat-img-cap {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.6rem 1.25rem;
    background: rgba(var(--rgb-deep), 0.6);
    backdrop-filter: blur(6px);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
}

/* ── Article body ── */
.article-body {
    font-size: 1rem;
    line-height: 1.9;
    color: var(--gray-700);
}

.article-body h2 {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--blue-dark);
    text-transform: uppercase;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--blue-light);
}

.article-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 1.75rem 0 0.75rem;
}

.article-body p {
    margin-bottom: 1.2rem;
}

.article-body strong {
    color: var(--gray-900);
}

.article-body a {
    color: var(--blue);
    font-weight: 600;
    text-decoration: none;
}

.article-body a:hover {
    text-decoration: underline;
}

/* Blockquote */
.article-body blockquote {
    border-left: 4px solid var(--blue);
    background: var(--blue-light);
    padding: 1.25rem 1.5rem;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    margin: 1.75rem 0;
    font-size: 1.02rem;
    color: var(--blue-dark);
    font-style: italic;
    font-weight: 500;
}

/* Callout box */
.callout {
    background: linear-gradient(135deg, var(--blue-light), #d0e8f8);
    border: 1.5px solid rgba(var(--rgb-primary), 0.2);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    margin: 1.75rem 0;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.callout-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
}

.callout-text {
    font-size: 0.9rem;
    color: var(--blue-dark);
    line-height: 1.75;
}

.callout-text strong {
    color: var(--blue-dark);
}

/* Comparison table */
.comp-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.75rem 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    font-size: 0.88rem;
}

.comp-table th {
    background: var(--blue-dark);
    color: white;
    padding: 0.9rem 1.1rem;
    text-align: left;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.comp-table td {
    padding: 0.85rem 1.1rem;
    border-bottom: 1px solid var(--gray-200);
    color: var(--gray-500);
    vertical-align: top;
}

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

.comp-table tr:nth-child(even) td {
    background: var(--gray-50);
}

.comp-table td:first-child {
    font-weight: 700;
    color: var(--gray-900);
}

.comp-table td .yes {
    color: #2e7d32;
    font-weight: 700;
}

.comp-table td .no {
    color: #c62828;
    font-weight: 700;
}

/* Numbered step list */
.step-list {
    list-style: none;
    counter-reset: steps;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    margin: 1.5rem 0;
}

.step-list li {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    counter-increment: steps;
}

.step-list li::before {
    content: counter(steps);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--blue);
    color: white;
    font-size: 0.82rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Image in article */
.article-img {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: 1.75rem 0;
    aspect-ratio: 16/9;
    display: block;
}

.article-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-img-cap {
    font-size: 0.78rem;
    color: var(--gray-400);
    text-align: center;
    margin-top: -1.2rem;
    margin-bottom: 1.75rem;
}

/* Tags */
.article-tags {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin: 2.5rem 0;
    padding: 1.5rem 0;
    border-top: 1px solid var(--gray-200);
    border-bottom: 1px solid var(--gray-200);
}

.tag-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--gray-700);
    text-transform: uppercase;
}

.tag-item {
    padding: 0.3rem 0.85rem;
    border-radius: 20px;
    border: 1.5px solid var(--gray-200);
    font-size: 0.75rem;
    color: var(--gray-500);
    text-decoration: none;
    transition: var(--transition);
}

.tag-item:hover {
    background: var(--blue);
    border-color: var(--blue);
    color: white;
}

/* Share section */
.article-share {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.share-label {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--gray-700);
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1rem;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
}

.share-fb {
    background: #1877f2;
    color: white;
}

.share-zalo {
    background: #0068ff;
    color: white;
}

.share-copy {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}

.share-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

/* Author card */
.author-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 1.75rem;
    display: flex;
    gap: 1.25rem;
    margin-bottom: 3rem;
    border: 1.5px solid var(--gray-200);
}

.author-card-avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--blue), var(--blue-mid));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
    overflow: hidden;
}

.author-card-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-card-name {
    font-size: 1rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.2rem;
}

.author-card-role {
    font-size: 0.78rem;
    color: var(--blue);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.author-card-bio {
    font-size: 0.85rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* Related posts */
.related-posts {
    margin-bottom: 3rem;
}

.related-posts h3 {
    font-size: 1rem;
    font-weight: 800;
    color: var(--gray-900);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1.25rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--blue-light);
}

.rel-post {
    display: flex;
    gap: 0.9rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-100);
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.rel-post:last-child {
    border-bottom: none;
}

.rel-post:hover .rel-title {
    color: var(--blue);
}

.rel-thumb {
    width: 72px;
    height: 56px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--blue-light), #c5ddf5);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    overflow: hidden;
}

.rel-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.rel-title {
    font-size: 0.83rem;
    font-weight: 600;
    color: var(--gray-900);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.45;
    margin-bottom: 0.2rem;
}

.rel-date {
    font-size: 0.7rem;
    color: var(--gray-400);
}

/* Sidebar identical to tin-tuc but compact */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 90px;
}

.sb-box {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.4rem;
    border: 1.5px solid var(--gray-200);
}

.sb-title {
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--blue-dark);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.1rem;
    padding-bottom: 0.55rem;
    border-bottom: 2px solid var(--blue-light);
}

.sb-cats {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.sb-cats li a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.45rem 0.65rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--gray-500);
    font-size: 0.83rem;
    transition: var(--transition);
}

.sb-cats li a:hover {
    background: var(--blue-light);
    color: var(--blue-dark);
}

.sb-cnt {
    background: var(--blue-light);
    color: var(--blue);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.1rem 0.45rem;
    border-radius: 10px;
}

.sb-pop {
    display: flex;
    gap: 0.75rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--gray-100);
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.sb-pop:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.sb-pop:hover .sb-pop-title {
    color: var(--blue);
}

.sb-pop-thumb {
    width: 56px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    overflow: hidden;
}

.sb-pop-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sb-pop-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--gray-900);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.sb-pop-date {
    font-size: 0.68rem;
    color: var(--gray-400);
    margin-top: 0.15rem;
}

.tags-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag-s {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    border: 1.5px solid var(--gray-200);
    font-size: 0.72rem;
    color: var(--gray-500);
    text-decoration: none;
    transition: var(--transition);
}

.tag-s:hover {
    background: var(--blue);
    border-color: var(--blue);
    color: white;
}

.sb-cta {
    background: linear-gradient(135deg, var(--blue-deep), var(--blue));
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    color: white;
}

.sb-cta h4 {
    font-size: 0.92rem;
    font-weight: 800;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}

.sb-cta p {
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.sb-cta a {
    display: inline-block;
    background: var(--yellow);
    color: var(--gray-900);
    padding: 0.55rem 1.3rem;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
}

.sb-cta a:hover {
    filter: brightness(1.08);
}

/* Toc */
.toc {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.toc li a {
    display: block;
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    color: var(--gray-500);
    text-decoration: none;
    border-radius: var(--radius-sm);
    border-left: 2px solid transparent;
    transition: var(--transition);
}

.toc li a:hover,
.toc li a.active {
    color: var(--blue-dark);
    border-left-color: var(--blue);
    background: var(--blue-light);
}

/* Progress bar */
.read-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--blue), var(--yellow));
    z-index: 9999;
    transition: width 0.1s;
    width: 0%;
}

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

    .sidebar {
        position: static
    }
}

@media(max-width:768px) {
    .article-title {
        font-size: 1.5rem
    }

    .article-layout {
        padding: 1.5rem 1rem;
        gap: 1.5rem
    }

    .article-body {
        font-size: 0.95rem
    }

    .article-body h2 {
        font-size: 1.2rem
    }

    .article-body h3 {
        font-size: 1rem
    }

    .article-meta {
        gap: 0.75rem;
        font-size: 0.75rem
    }

    .feat-img {
        aspect-ratio: 16/9;
        border-radius: 10px
    }

    .article-share {
        flex-wrap: wrap
    }

    .comp-table {
        font-size: 0.78rem;
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch
    }

    .comp-table th,
    .comp-table td {
        padding: 0.6rem 0.75rem;
        white-space: nowrap
    }

    .callout {
        flex-direction: column;
        gap: 0.5rem;
        padding: 1rem
    }

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

    .sidebar {
        display: none
    }

    .related-posts .posts-grid {
        grid-template-columns: 1fr !important
    }
}

@media(max-width:480px) {
    .article-layout {
        padding: 1rem 0.875rem
    }

    .article-title {
        font-size: 1.25rem;
        line-height: 1.3
    }

    .feat-img {
        aspect-ratio: 16/9;
        border-radius: 8px;
        font-size: 3rem
    }

    .article-body {
        font-size: 0.9rem;
        line-height: 1.8
    }

    .article-body h2 {
        font-size: 1.1rem;
        padding-bottom: 0.4rem
    }

    .article-body img {
        width: 100% !important;
        height: auto !important;
        border-radius: 8px
    }

    .article-body table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: 0.78rem
    }

    .article-body iframe {
        width: 100% !important;
        max-width: 100%
    }

    .article-body pre {
        overflow-x: auto;
        font-size: 0.78rem
    }

    .article-tags {
        padding: 1rem 0;
        gap: 0.35rem
    }

    .article-share {
        gap: 0.5rem
    }

    .article-share a {
        padding: 0.4rem 0.75rem;
        font-size: 0.78rem
    }

    .step-list li {
        gap: 0.6rem
    }

    .step-list li::before {
        width: 26px;
        height: 26px;
        font-size: 0.75rem;
        flex-shrink: 0
    }

    .comp-table {
        font-size: 0.72rem
    }

    .sb-cta {
        padding: 1rem
    }

    .article-header {
        margin-bottom: 1.5rem
    }
}

/* ══ MOBILE CONTENT FIX ══ */
.article-body * {
    max-width: 100%;
}

.article-body img {
    height: auto !important;
    border-radius: 8px;
}

.article-body iframe {
    max-width: 100% !important;
}

.article-body table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.article-body pre,
.article-body code {
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.article-body blockquote {
    margin-left: 0;
    margin-right: 0;
}