:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-border: #e2e8f0;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --space-2: 0.5rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --container-max: 1200px;
    --container-padding: 1rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

img { max-width: 100%; height: auto; display: block; }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover { color: var(--color-primary-dark); }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.main-content {
    min-height: calc(100vh - 200px);
    padding: var(--space-8) 0;
}

.site-header {
    background: linear-gradient(135deg, #1a2a4a, #2d3a52);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.logo { display: flex; align-items: center; gap: var(--space-2); }

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-main {
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.5px;
}

.logo-tagline {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.main-nav a {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    font-size: 0.875rem;
}

.main-nav a:hover { color: #fff; }

/* Header search */
.header-search {
    display: flex;
    align-items: center;
    position: relative;
    gap: var(--space-2);
}

.header-search__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    background: transparent;
    color: #fff;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
    flex-shrink: 0;
}

.header-search__toggle:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.5);
}

.header-search__form {
    display: flex;
    align-items: center;
    overflow: hidden;
    width: 0;
    opacity: 0;
    transition: width 0.25s ease, opacity 0.2s ease;
    background: #fff;
    border-radius: 999px;
}

.header-search.is-open .header-search__form {
    width: 240px;
    opacity: 1;
}

.header-search__input {
    flex: 1;
    min-width: 0;
    border: 0;
    outline: none;
    padding: 8px 14px;
    font-size: 0.875rem;
    background: transparent;
    color: #1a2a4a;
}

.header-search__submit {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 0;
    background: transparent;
    color: #1a2a4a;
    padding: 0 12px;
    cursor: pointer;
}

@media (max-width: 768px) {
    .header-search.is-open {
        position: static;
    }
    .header-search.is-open .header-search__form {
        position: absolute;
        top: calc(100% + 8px);
        right: 0;
        left: 0;
        width: auto;
        z-index: 110;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    }
}

.home-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hero-banner { margin-bottom: var(--space-10); }

.hero-grid-5 {
    display: grid;
    gap: 12px;
}

.hero-main a,
.hero-side-item a { display: block; color: inherit; }

.hero-image-wrap {
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: var(--color-bg-alt);
}

.hero-main .hero-image-wrap {
    aspect-ratio: 16 / 10;
    min-height: 220px;
}

.hero-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.hero-main:hover img { transform: scale(1.03); }

.hero-side-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr 1fr;
}

.hero-side-item { position: relative; }

.hero-side-item .hero-image-wrap {
    aspect-ratio: 16 / 10;
}

.hero-side-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.hero-side-item:hover img { transform: scale(1.05); }

.hero-caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 8px 12px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
    color: #fff;
}

.hero-caption span {
    font-size: 12px;
    font-weight: 600;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (min-width: 768px) {
    .hero-grid-5 {
        grid-template-columns: 1.2fr 1fr;
        align-items: stretch;
    }

    .hero-main .hero-image-wrap {
        height: 100%;
        min-height: 420px;
        aspect-ratio: auto;
    }
}

.news-section { margin-bottom: var(--space-10); }

.section-header {
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--color-primary);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.section-lead {
    margin-top: var(--space-2);
    margin-bottom: 0;
    font-size: 0.95rem;
    line-height: 1.6;
    max-width: 720px;
}

.news-category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3) var(--space-5);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border, #e5e7eb);
}

.news-category-nav__link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-light);
    text-decoration: none;
    white-space: nowrap;
}

.news-category-nav__link:hover {
    color: var(--color-primary);
}

.news-category-nav__link.is-active {
    color: var(--color-primary);
    font-weight: 700;
}

.news-grid {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .news-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .news-grid { grid-template-columns: repeat(4, 1fr); }
}

.news-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.news-card-img {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--color-bg-alt);
}

.news-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.news-card:hover .news-card-img img { transform: scale(1.05); }

.news-card-body { padding: 14px; }

.news-card-body h3 {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-body time {
    font-size: 12px;
    color: var(--color-text-muted);
}

.ad-container {
    margin: var(--space-6) 0;
    padding: var(--space-4);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    text-align: center;
    min-height: 90px;
    overflow: hidden;
}

.ad-container iframe,
.ad-container img {
    margin: 0 auto;
}

.site-footer {
    background: #1e293b;
    padding: 30px 0;
    margin-top: 50px;
}

.site-footer .container { text-align: center; }

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}

.footer-links a:hover { color: #fff; }

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* Quảng cáo — AdsConex / Taboola */
.ad-container {
    margin: var(--space-6) auto;
    text-align: center;
    min-height: 90px;
    overflow: hidden;
}

.ad-container--video {
    min-height: 200px;
}

.ad-container--taboola,
.ad-container--mid {
    min-height: 120px;
}

.adsconex-parallax_wrapper {
    display: block;
    margin: var(--space-6) 0;
}

.adsconex-parallax_ad {
    display: flex;
    justify-content: center;
    align-items: center;
}

.article-page .container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.article-header { margin-bottom: 24px; }

.article-page-title {
    font-size: 32px;
    line-height: 1.25;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

@media (min-width: 768px) {
    .article-page-title { font-size: 42px; }
}

.article-meta {
    display: flex;
    gap: 16px;
    color: var(--color-text-light);
    font-size: 14px;
}

.article-featured-image {
    margin-bottom: var(--space-8);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

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

.article-body {
    font-size: 18px;
    line-height: 1.8;
    color: var(--color-text);
    overflow-wrap: anywhere;
    word-break: break-word;
}

.article-body > * {
    max-width: 100%;
}

.article-body div:empty {
    display: none;
}

.article-body p { margin-bottom: var(--space-6); }

.article-body img {
    border-radius: var(--radius-md);
    margin: var(--space-8) auto;
}

.article-body h2,
.article-body h3 {
    margin-top: var(--space-10);
    margin-bottom: var(--space-4);
    font-weight: 700;
}

.breadcrumb {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: var(--space-6);
}

.breadcrumb a { color: var(--color-text-light); }

.related-section { margin-top: var(--space-12); }

/* Continue Reading — inspired by celedaily.cafex.biz */
.continue-reading-stack {
    margin-top: var(--space-10);
    margin-bottom: var(--space-8);
}

.continue-reading-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, #d1d5db, transparent);
    margin: var(--space-8) 0;
}

.continue-reading-label {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin-bottom: var(--space-3);
}

.continue-reading-next-title,
.continue-reading-title {
    font-size: 24px;
    line-height: 1.35;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: var(--space-4);
}

.continue-reading-title a {
    color: inherit;
    text-decoration: none;
}

.continue-reading-title a:hover {
    color: var(--color-primary, #2563eb);
}

.btn-continue {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 420px;
    margin: var(--space-4) auto 0;
    padding: 14px 24px;
    border: 2px solid #1a2a4a;
    border-radius: 999px;
    background: #fff;
    color: #1a2a4a;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, transform 0.15s;
}

.btn-continue:hover {
    background: #1a2a4a;
    color: #fff;
}

.btn-continue-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.25s ease;
}

.btn-continue[aria-expanded="true"] .btn-continue-icon {
    transform: rotate(180deg);
}

.continue-reading-gate {
    text-align: center;
    padding: var(--space-6) 0;
}

.continue-reading-article {
    margin-top: var(--space-8);
    padding-top: var(--space-2);
    animation: continueFadeIn 0.45s ease;
}

.continue-reading-article.is-visible {
    display: block;
}

.continue-reading-header {
    margin-bottom: var(--space-6);
}

.continue-reading-full-link {
    margin-top: var(--space-8);
    text-align: center;
    font-weight: 600;
}

.continue-reading-full-link a {
    color: var(--color-primary, #2563eb);
}

@keyframes continueFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.related-grid {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .related-grid { grid-template-columns: repeat(2, 1fr); }
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: var(--space-10);
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 14px;
}

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

.pagination .active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.no-content {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-12) 0;
}

@media (max-width: 640px) {
    .main-nav { gap: var(--space-4); }
    .main-nav a { font-size: 12px; }
    .article-page-title { font-size: 28px; }
}

/* Static pages (Contact, Terms, Privacy) */
.static-page {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.static-page h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--color-primary);
}

.static-page h2 {
    font-size: 22px;
    font-weight: 600;
    color: #334155;
    margin-top: 30px;
    margin-bottom: 15px;
}

.static-page h3 {
    font-size: 18px;
    font-weight: 600;
    color: #475569;
    margin-top: 25px;
    margin-bottom: 12px;
}

.static-page p {
    font-size: 16px;
    line-height: 1.8;
    color: #475569;
    margin-bottom: 16px;
}

.static-page ul {
    margin: 16px 0;
    padding-left: 24px;
}

.static-page li {
    font-size: 16px;
    line-height: 1.8;
    color: #475569;
    margin-bottom: 10px;
}

.static-page a {
    color: var(--color-primary);
    text-decoration: underline;
}

.static-page a:hover {
    color: var(--color-primary-dark);
}

.contact-section,
.terms-section,
.privacy-section {
    margin-top: 10px;
}

.contact-info {
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin: var(--space-6) 0;
    border-left: 4px solid var(--color-primary);
}

.contact-info h3 {
    margin-top: 0;
    color: var(--color-primary);
}

.contact-form-placeholder {
    background: #fff;
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-top: var(--space-6);
}