/* Bản tin, chuyên mục và bài viết. Selector dưới .ptn (danh sách) và .pta (bài viết). */

.ptn, .pta { font-family: var(--postum-font); color: var(--postum-text); line-height: 1.65; padding-bottom: var(--pt-s9); }
.ptn *, .ptn *::before, .ptn *::after, .pta *, .pta *::before, .pta *::after { box-sizing: border-box; }
.ptn ul, .ptn ol, .pta ul, .pta ol { list-style: none; margin: 0; padding: 0; }
.ptn p, .pta p { margin: 0; }
.ptn a, .pta a { color: var(--postum-primary); }
.ptn :focus-visible, .pta :focus-visible { outline: none; box-shadow: var(--pt-focus); border-radius: 6px; }
.ptn h1, .ptn h2, .ptn h3, .pta h1, .pta h2, .pta h3, .pta h4 { font-family: var(--postum-font-display); color: var(--postum-heading); line-height: 1.25; letter-spacing: -0.01em; margin: 0; }
.ptn-wrap { max-width: var(--pt-container); margin-inline: auto; padding-inline: var(--pt-gutter); }

.ptn-crumbs { padding: var(--pt-s4) 0 var(--pt-s3); font-size: var(--pt-text-sm); color: var(--postum-text-muted); }
.ptn-crumbs ol { display: flex; flex-wrap: wrap; gap: 4px; }
.ptn-crumbs li + li::before { content: "/"; margin-right: 4px; color: #9AA9B8; }
.ptn-crumbs a { color: var(--postum-text-muted); text-decoration: none; }
.ptn-crumbs a:hover { color: var(--postum-primary); text-decoration: underline; }
.ptn em { font-style: normal; font-weight: 400; color: var(--postum-text-muted); font-size: 0.8125rem; }

/* Đầu trang danh sách */
.ptn-head { display: grid; gap: var(--pt-s5); padding-bottom: var(--pt-s5); }
.ptn .ptn-head h1 { font-size: var(--pt-h1); font-weight: 700; text-wrap: balance; }
.ptn-head p { margin-top: var(--pt-s2); max-width: 60ch; color: var(--postum-text-muted); font-size: var(--pt-text-lg); }
.ptn-search label { display: block; margin-bottom: 6px; font-size: var(--pt-text-sm); font-weight: 600; color: var(--postum-heading); }
.ptn-search div { display: flex; gap: var(--pt-s2); }
.ptn .ptn-search input[type="search"] { flex: 1; min-width: 0; min-height: 48px; padding: 0 var(--pt-s4); border: 1px solid #9FB1C3; border-radius: var(--postum-radius-btn); background: #fff; color: var(--postum-text); font: 400 1rem/1 var(--postum-font); }
.ptn .ptn-search input:focus { outline: none; border-color: var(--postum-primary); box-shadow: 0 0 0 3px rgba(17, 88, 155, .2); }
.ptn .ptn-search button { min-height: 48px; padding: 0 var(--pt-s5); border: 0; border-radius: var(--postum-radius-btn); background: var(--postum-primary); color: #fff; font: 600 1rem/1 var(--postum-font); cursor: pointer; }
@media (min-width: 900px) { .ptn-head { grid-template-columns: 1fr 360px; align-items: end; } }

.ptn-chips { display: flex; flex-wrap: wrap; gap: var(--pt-s2); margin-bottom: var(--pt-s6); }
.ptn-chips a { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 var(--pt-s4); border: 1px solid var(--postum-border); border-radius: 999px; background: #fff; color: var(--postum-text); font-size: var(--pt-text-sm); font-weight: 600; text-decoration: none; }
.ptn-chips a:hover { border-color: var(--postum-primary); color: var(--postum-primary); }
.ptn-chips a[aria-current="page"] { background: var(--postum-primary); border-color: var(--postum-primary); color: #fff; }
.ptn-chips a[aria-current="page"] em { color: #D3E6F1; }

/* Card bài viết */
.ptn-card { display: grid; align-content: start; gap: var(--pt-s3); position: relative; }
.ptn-media { position: relative; display: block; aspect-ratio: 16 / 10; overflow: hidden; border-radius: var(--postum-radius-card); background: var(--postum-bg-alt); }
.ptn-media img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.ptn-card:hover .ptn-media img { transform: scale(1.03); }
.ptn-noimg { position: absolute; inset: 0; display: grid; place-items: center; color: #8BA5BA; }
.ptn-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px var(--pt-s3); font-size: 0.8125rem; color: var(--postum-text-muted); }
.ptn .ptn-cat, .pta .ptn-cat { position: relative; z-index: 2; font-weight: 700; color: var(--postum-primary); text-decoration: none; }
.ptn .ptn-cat:hover, .pta .ptn-cat:hover { text-decoration: underline; }
.ptn .ptn-title { font-size: 1.1875rem; font-weight: 700; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.ptn-title a { color: var(--postum-heading); text-decoration: none; }
.ptn-title a::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.ptn-title a:hover { text-decoration: underline; }
.ptn-excerpt { font-size: 0.9375rem; color: var(--postum-text-muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.ptn-body { display: grid; gap: var(--pt-s2); }

.ptn-lead { display: grid; gap: var(--pt-s6); margin-bottom: var(--pt-s7); }
.ptn-grid, .pta .ptn-grid { display: grid; gap: var(--pt-s6) var(--pt-s5); }
@media (min-width: 640px) { .ptn-grid, .pta .ptn-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) {
    .ptn-grid, .pta .ptn-grid { grid-template-columns: repeat(3, 1fr); }
    .ptn-lead { grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--pt-s5) var(--pt-s6); }
    .ptn-lead .ptn-card--lead { grid-row: 1 / span 2; }
    .ptn-lead .ptn-card--lead .ptn-title { font-size: 1.75rem; -webkit-line-clamp: 4; }
    .ptn-lead .ptn-card:not(.ptn-card--lead) { grid-template-columns: 1fr; }
}

/* Phân trang */
.ptn-pager { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: var(--pt-s2); margin-top: var(--pt-s7); }
.ptn .ptn-pager .page-numbers { display: inline-grid; place-items: center; min-width: 44px; min-height: 44px; padding: 0 var(--pt-s3); border: 1px solid var(--postum-border); border-radius: var(--postum-radius-btn); color: var(--postum-text); font-weight: 600; text-decoration: none; }
.ptn .ptn-pager a.page-numbers:hover { border-color: var(--postum-primary); }
.ptn .ptn-pager .page-numbers.current { background: var(--postum-primary); border-color: var(--postum-primary); color: #fff; }
.ptn .ptn-pager .page-numbers.dots { border: 0; }
.ptn .ptn-pager .prev, .ptn .ptn-pager .next { color: var(--postum-primary); }

.ptn-empty { display: grid; gap: var(--pt-s3); justify-items: start; max-width: 60ch; padding: var(--pt-s6); border: 1px dashed #9FB1C3; border-radius: var(--postum-radius-card); background: var(--postum-bg-alt); }

/* CTA */
.ptn-cta { display: grid; gap: var(--pt-s4); align-items: center; margin-top: var(--pt-s8); padding: var(--pt-s6); background: var(--postum-bg-alt); border-radius: var(--postum-radius-card); }
.ptn-cta h2 { font-size: 1.375rem; }
.ptn-cta div p { margin-top: var(--pt-s2); color: var(--postum-text-muted); max-width: 56ch; }
.ptn-cta > p { display: flex; flex-wrap: wrap; gap: var(--pt-s3); }
.ptn .ptn-btn, .pta .ptn-btn { display: inline-flex; align-items: center; min-height: 48px; padding: 0 var(--pt-s5); border: 1px solid var(--postum-accent); border-radius: var(--postum-radius-btn); background: var(--postum-accent); color: var(--postum-on-accent); font-weight: 600; text-decoration: none; }
.ptn .ptn-btn:hover, .pta .ptn-btn:hover { background: var(--postum-accent-hover); }
.ptn .ptn-btn--ghost, .pta .ptn-btn--ghost { background: #fff; border-color: var(--postum-primary); color: var(--postum-primary); }
.ptn .ptn-btn--ghost:hover, .pta .ptn-btn--ghost:hover { background: var(--postum-bg-alt); }
@media (min-width: 800px) { .ptn-cta { grid-template-columns: 1fr auto; } }

/* ---------- Bài viết ---------- */
.pta-head { max-width: 820px; padding-bottom: var(--pt-s5); }
.pta .pta-head h1 { margin-top: var(--pt-s2); font-size: var(--pt-h1); font-weight: 700; text-wrap: balance; }
.pta-dates { display: flex; flex-wrap: wrap; gap: 4px var(--pt-s4); margin-top: var(--pt-s3) !important; font-size: var(--pt-text-sm); color: var(--postum-text-muted); }
.pta-cover { margin: 0 0 var(--pt-s6); }
.pta-cover img { display: block; width: 100%; height: auto; max-height: 560px; object-fit: cover; border-radius: var(--postum-radius-gallery); }

.pta-layout { display: grid; gap: var(--pt-s6); }
.pta-main { min-width: 0; }
@media (min-width: 1100px) {
    .pta-layout { grid-template-columns: minmax(0, 1fr) 300px; gap: var(--pt-s8); align-items: start; }
    .pta-main { max-width: 760px; }
    .pta-toc { position: sticky; top: calc(var(--pt-offset) + var(--pt-s5)); max-height: calc(100vh - var(--pt-offset) - 48px); overflow: auto; }
    .pta-toc-inline { display: none; }
}
@media (max-width: 1099px) { .pta-toc { display: none; } }

.pta-toc { padding-left: var(--pt-s5); border-left: 1px solid var(--postum-border); }
.pta-toc-title { margin-bottom: var(--pt-s3) !important; font: 700 1rem/1.3 var(--postum-font-display); color: var(--postum-heading); }
.pta-toc li a { display: block; padding: 6px 0; font-size: 0.9375rem; line-height: 1.4; color: var(--postum-text-muted); text-decoration: none; border-left: 3px solid transparent; margin-left: calc(-1 * var(--pt-s5) - 2px); padding-left: calc(var(--pt-s5) - 1px); }
.pta-toc li a:hover { color: var(--postum-primary); }
.pta-toc li a.is-active { color: var(--postum-heading); font-weight: 600; border-left-color: var(--postum-accent); }
.pta-toc-inline { margin-bottom: var(--pt-s6); padding: var(--pt-s4) var(--pt-s5); background: var(--postum-bg-alt); border-radius: var(--postum-radius-card); }
.pta-toc-inline summary { cursor: pointer; font: 700 1rem/1.3 var(--postum-font-display); color: var(--postum-heading); }
.pta-toc-inline ol { margin-top: var(--pt-s3) !important; counter-reset: toc; display: grid; gap: 4px; }
.pta-toc-inline li { counter-increment: toc; display: flex; gap: var(--pt-s2); }
.pta-toc-inline li::before { content: counter(toc) "."; color: var(--postum-text-muted); }
.pta-toc-inline a { text-decoration: none; }
.pta-toc-inline a:hover { text-decoration: underline; }

/* Nội dung bài: dễ đọc (dòng ~68 ký tự, 17px) */
.pta-prose { font-size: 1.0625rem; line-height: 1.85; color: #1B2538; overflow-wrap: anywhere; }
.pta-prose > * + * { margin-top: 1.25em; }
.pta-prose h2 { margin-top: 2.2em; font-size: var(--pt-h2); scroll-margin-top: calc(var(--pt-offset) + 16px); }
.pta-prose h3 { margin-top: 1.8em; font-size: 1.3125rem; scroll-margin-top: calc(var(--pt-offset) + 16px); }
.pta-prose h4 { margin-top: 1.5em; font-size: 1.125rem; }
.pta-prose h2 + *, .pta-prose h3 + * { margin-top: .7em; }
.pta-prose a { text-decoration: underline; text-underline-offset: 2px; }
.pta-prose ul, .pta-prose ol { list-style: revert; padding-left: 1.4em; }
.pta-prose li + li { margin-top: .4em; }
.pta-prose blockquote { margin-inline: 0; padding: var(--pt-s2) var(--pt-s5); border-left: 4px solid var(--postum-primary); background: var(--postum-bg-alt); border-radius: 0 var(--postum-radius-btn) var(--postum-radius-btn) 0; }
.pta-prose img { display: block; max-width: 100%; height: auto; border-radius: var(--postum-radius-btn); }
.pta-prose figure, .pta-prose .wp-caption { max-width: 100% !important; width: auto !important; margin-inline: 0; }
.pta-prose figcaption, .pta-prose .wp-caption-text { margin-top: var(--pt-s2); font-size: 0.875rem; line-height: 1.5; color: var(--postum-text-muted); text-align: left; }
.pta-prose iframe, .pta-prose video { display: block; width: 100%; max-width: 100%; aspect-ratio: 16 / 9; height: auto; border: 0; border-radius: var(--postum-radius-btn); }
.pta-prose table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; font-size: 0.9375rem; }
.pta-prose th, .pta-prose td { padding: 8px 12px; border: 1px solid var(--postum-border); text-align: left; }
.pta-prose th { background: var(--postum-bg-alt); }

.pta-section { margin-top: var(--pt-s8); padding-top: var(--pt-s7); border-top: 1px solid var(--postum-border); }
.ptn-sechead { display: flex; align-items: baseline; justify-content: space-between; gap: var(--pt-s4); margin-bottom: var(--pt-s5); }
.pta .ptn-sechead h2 { font-size: var(--pt-h2); }
.ptn-sechead a { font-weight: 600; font-size: var(--pt-text-sm); }
.pta .ptc-grid { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
@media (min-width: 1100px) { .pta .ptc-grid { grid-template-columns: repeat(4, 1fr); } }

@media (prefers-reduced-motion: reduce) { .ptn-media img { transition: none; } .ptn-card:hover .ptn-media img { transform: none; } }