/* Blog /blog — kiểu tin tức: ảnh bìa, tóm tắt, ngày, mục lục. Dùng token tokens.css (tự sáng/tối). */
.bn{--bn-w:1180px;--bn-fd:var(--font-display,Georgia,serif);background:var(--bg,#F5F5F7);color:var(--text,#1d1d1f);font-family:var(--font,system-ui,sans-serif);min-height:60vh;overflow-x:clip}
.bn *{box-sizing:border-box}
.bn a{color:inherit}
.bn img{display:block;max-width:100%;height:auto}
.bn-hero{padding:28px 0 22px;background:linear-gradient(180deg,var(--accent-soft,rgba(0,113,227,.1)),transparent 85%);border-bottom:1px solid var(--line,rgba(60,60,67,.14))}
.bn-bc{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:14px;color:var(--text-2,#5c5c61);margin:0 0 14px}
.bn-bc a{text-decoration:none}.bn-bc a:hover{text-decoration:underline}
.bn-kick{margin:0 0 6px;font-size:13px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--accent,#0071E3)}
.bn-hero h1{font:600 clamp(34px,5.5vw,54px)/1.08 var(--bn-fd);margin:0 0 10px;letter-spacing:-.01em}
.bn-sub{margin:0 0 18px;max-width:720px;font-size:18px;line-height:1.6;color:var(--text-2,#5c5c61)}
.bn-chips{display:flex;flex-wrap:wrap;gap:8px}
.bn-chips a{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 15px;border-radius:999px;background:var(--surface,#fff);border:1px solid var(--line-2,rgba(60,60,67,.22));font-size:15px;font-weight:500;text-decoration:none;color:var(--text,#1d1d1f)}
.bn-chips a i{font-style:normal;font-size:13px;color:var(--text-2,#5c5c61)}
.bn-chips a:hover{border-color:var(--accent,#0071E3)}
.bn-chips a.on{background:var(--accent,#0071E3);border-color:var(--accent,#0071E3);color:var(--on-accent,#fff)}
.bn-chips a.on i{color:inherit;opacity:.85}
.bn-body{padding:30px 0 56px}
.bn-h2{font:600 clamp(24px,3.4vw,32px)/1.15 var(--bn-fd);margin:34px 0 16px}
.bn-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.bn-card{display:flex;flex-direction:column;background:var(--surface,#fff);border:1px solid var(--line,rgba(60,60,67,.14));border-radius:var(--r-m,16px);overflow:hidden;box-shadow:var(--shadow-1,0 1px 2px rgba(0,0,0,.05));transition:transform .2s,box-shadow .2s}
.bn-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2,0 12px 40px rgba(0,0,0,.14))}
@media(prefers-reduced-motion:reduce){.bn-card{transition:none}.bn-card:hover{transform:none}}
.bn-img{display:block;aspect-ratio:3/2;overflow:hidden;background:var(--surface-2,#eee)}
.bn-img img{width:100%;height:100%;object-fit:cover}
.bn-tx{display:flex;flex-direction:column;flex:1;padding:16px 18px 18px;gap:8px}
.bn-pill{align-self:flex-start;display:inline-block;padding:4px 11px;border-radius:999px;background:var(--accent-soft,rgba(0,113,227,.12));color:var(--accent,#0071E3);font-size:13px;font-weight:600;text-decoration:none;letter-spacing:.02em}
.bn-pill:hover{text-decoration:underline}
.bn-ti{font:600 20px/1.25 var(--bn-fd);margin:0}
.bn-ti a{text-decoration:none}.bn-ti a:hover{text-decoration:underline}
.bn-ti,.bn-ex{display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden}
.bn-ti{-webkit-line-clamp:4;line-clamp:4}
.bn-ex{margin:0;font-size:15.5px;line-height:1.55;color:var(--text-2,#5c5c61);-webkit-line-clamp:3;line-clamp:3}
.bn-mt{display:flex;flex-wrap:wrap;gap:6px;margin:auto 0 0;padding-top:4px;font-size:14px;color:var(--text-2,#5c5c61)}
.bn-big{flex-direction:row;margin-bottom:6px}
.bn-big .bn-img{flex:1.25;aspect-ratio:auto;min-height:340px}
.bn-big .bn-tx{flex:1;justify-content:center;padding:34px 36px;gap:12px}
.bn-big .bn-ti{font-size:clamp(26px,2.7vw,34px);line-height:1.15;-webkit-line-clamp:unset;line-clamp:unset;display:block}
.bn-big .bn-ex{font-size:17.5px;-webkit-line-clamp:5;line-clamp:5}
.bn-big .bn-mt{margin-top:6px}
.bn-pager{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:34px 0 8px}
.bn-pager a,.bn-pager span{min-width:44px;min-height:44px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;border:1px solid var(--line-2,rgba(60,60,67,.22));background:var(--surface,#fff);font-weight:600;text-decoration:none;color:var(--text,#1d1d1f)}
.bn-pager .on{background:var(--accent,#0071E3);border-color:var(--accent,#0071E3);color:var(--on-accent,#fff)}
.bn-pager .off{opacity:.45}
.bn-note{margin:30px 0 0;font-size:14px;line-height:1.6;color:var(--text-2,#5c5c61);max-width:760px}
/* bài viết */
.bn-ah{padding:26px 0 8px}
.bn .bn-aw{max-width:980px}
.bn-ah h1{font:600 clamp(32px,5vw,50px)/1.1 var(--bn-fd);margin:12px 0 12px;letter-spacing:-.01em}
.bn-lead{margin:0 0 12px;font-size:19px;line-height:1.6;color:var(--text-2,#5c5c61)}
.bn-ah .bn-mt{margin:0;padding:0}
.bn-cover{margin:18px 0 6px}
.bn-cover img{width:100%;aspect-ratio:2/1;object-fit:cover;border-radius:var(--r-l,20px);background:var(--surface-2,#eee)}
.bn-cover figcaption,.bn-fig figcaption{margin-top:8px;font-size:13.5px;line-height:1.5;color:var(--text-2,#5c5c61)}
.bn-cr a{text-decoration:underline;text-underline-offset:2px}
.bn .bn-wrap{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:48px;max-width:980px;padding-top:18px;padding-bottom:30px;align-items:start}
.bn-art{min-width:0;max-width:700px}
.bn-sum{border-left:4px solid var(--accent,#0071E3);background:var(--surface,#fff);border-radius:0 var(--r-m,16px) var(--r-m,16px) 0;padding:16px 20px;margin:0 0 22px;border-top:1px solid var(--line,rgba(60,60,67,.14));border-right:1px solid var(--line,rgba(60,60,67,.14));border-bottom:1px solid var(--line,rgba(60,60,67,.14))}
.bn-sum b{display:block;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent,#0071E3);margin-bottom:6px}
.bn-sum p{margin:0;font-size:17px;line-height:1.65}
.bn-side{position:sticky;top:84px}
.bn-toc{background:var(--surface,#fff);border:1px solid var(--line,rgba(60,60,67,.14));border-radius:var(--r-m,16px);padding:16px 18px;font-size:15px}
.bn-toc b,.bn-toc summary{font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-2,#5c5c61)}
.bn-toc ol{list-style:none;margin:10px 0 0;padding:0;counter-reset:t}
.bn-toc li{counter-increment:t;margin:0}
.bn-toc li a{display:block;padding:7px 0 7px 26px;position:relative;line-height:1.4;text-decoration:none;color:var(--text,#1d1d1f);border-top:1px solid var(--line,rgba(60,60,67,.14))}
.bn-toc li:first-child a{border-top:0}
.bn-toc li a::before{content:counter(t);position:absolute;left:0;top:7px;font-size:13px;font-weight:600;color:var(--accent,#0071E3)}
.bn-toc li a:hover{color:var(--accent,#0071E3)}
.bn-toc-m{display:none;margin:0 0 22px}
.bn-toc summary{cursor:pointer;min-height:24px}
.bn-prose{font-size:18px;line-height:1.78}
.bn-prose p{margin:0 0 1.05em}
.bn-prose h2{font:600 clamp(26px,3.6vw,32px)/1.2 var(--bn-fd);margin:2em 0 .6em;scroll-margin-top:84px}
.bn-prose h3{font:600 21px/1.3 var(--font,system-ui);margin:1.6em 0 .5em;scroll-margin-top:84px}
.bn-prose h4{font-size:18px;margin:1.4em 0 .4em}
.bn-prose ul,.bn-prose ol{margin:0 0 1.2em;padding-left:1.4em}
.bn-prose li{margin:.35em 0;padding-left:.2em}
.bn-prose li::marker{color:var(--accent,#0071E3)}
.bn-prose a{color:var(--accent,#0071E3);text-underline-offset:3px}
.bn-prose strong{font-weight:650}
.bn-prose code{font-size:.9em;padding:2px 6px;border-radius:6px;background:var(--surface-2,#eee)}
.bn-prose hr{border:0;border-top:1px solid var(--line-2,rgba(60,60,67,.22));margin:2em 0}
.bn-prose blockquote{margin:1.4em 0;padding:4px 20px;border-left:4px solid var(--accent,#0071E3);background:var(--surface,#fff);border-radius:0 12px 12px 0;color:var(--text,#1d1d1f)}
.bn-prose blockquote p{margin:.7em 0}
.bn-ck{list-style:none;padding-left:0!important}
.bn-ck li{display:flex;gap:12px;align-items:flex-start;padding-left:0}
.bn-box{flex:none;width:20px;height:20px;margin-top:.4em;border:2px solid var(--accent,#0071E3);border-radius:6px;background:var(--surface,#fff)}
.bn-box.on{background:var(--accent,#0071E3)}
.bn-fig{margin:1.6em 0}
.bn-fig img{width:100%;border-radius:var(--r-m,16px);background:var(--surface-2,#eee)}
.bn-tw{overflow-x:auto;margin:1.4em 0;border:1px solid var(--line-2,rgba(60,60,67,.22));border-radius:var(--r-m,16px);background:var(--surface,#fff);-webkit-overflow-scrolling:touch}
.bn-tw table{border-collapse:collapse;width:100%;min-width:480px;font-size:16px;line-height:1.5}
.bn-tw th,.bn-tw td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line,rgba(60,60,67,.14))}
.bn-tw thead th{background:var(--accent-soft,rgba(0,113,227,.12));font-size:14px;letter-spacing:.04em;text-transform:uppercase;color:var(--text,#1d1d1f)}
.bn-tw tbody th{font-weight:600}
.bn-tw tr:last-child th,.bn-tw tr:last-child td{border-bottom:0}
.bn-credits{margin:1.6em 0 0;font-size:13.5px;line-height:1.6;color:var(--text-2,#5c5c61)}
.bn-credits a{text-decoration:underline;text-underline-offset:2px}
.bn-cta{display:flex;flex-wrap:wrap;gap:16px 24px;align-items:center;justify-content:space-between;margin:34px 0 0;padding:22px 24px;border-radius:var(--r-l,20px);background:var(--surface,#fff);border:1px solid var(--line-2,rgba(60,60,67,.22))}
.bn-cta b{display:block;font:600 22px/1.25 var(--bn-fd);margin-bottom:4px}
.bn-cta p{margin:0;font-size:16px;line-height:1.5;color:var(--text-2,#5c5c61);max-width:360px}
.bn-btns{display:flex;flex-wrap:wrap;gap:10px}
.bn-btns .hm-btn{min-height:48px;padding:0 22px;font-size:16px}
.bn-btns .hm-btn--l{background:transparent;color:var(--accent,#0071E3)!important}
.bn-rel{padding:16px 0 56px;border-top:1px solid var(--line,rgba(60,60,67,.14))}
.bn-more{margin:20px 0 0;font-weight:600}.bn-more a{color:var(--accent,#0071E3);text-decoration:none}.bn-more a:hover{text-decoration:underline}
.bn-prog{position:fixed;left:0;top:0;height:3px;width:100%;background:var(--accent,#0071E3);transform:scaleX(0);transform-origin:0 50%;z-index:80;pointer-events:none}
.bn a:focus-visible,.bn summary:focus-visible{outline:3px solid var(--accent,#0071E3);outline-offset:2px;border-radius:6px}
@media(max-width:980px){
 .bn .bn-wrap{grid-template-columns:minmax(0,1fr);gap:0}
 .bn-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .bn-wrap{grid-template-columns:minmax(0,1fr);gap:0}
 .bn-side{display:none}.bn-toc-m{display:block}
 .bn-art{max-width:none}
}
@media(max-width:760px){
 .bn-big{flex-direction:column}.bn-big .bn-img{min-height:0;aspect-ratio:3/2;flex:none}.bn-big .bn-tx{padding:18px 18px 20px}
 .bn-big .bn-ti{font-size:24px}.bn-big .bn-ex{font-size:16px}
}
@media(max-width:600px){
 .bn-hero{padding:20px 0 18px}.bn-sub{font-size:16.5px}
 .bn-grid{grid-template-columns:minmax(0,1fr);gap:16px}
 .bn-prose{font-size:17px}.bn-lead{font-size:17px}
 .bn-cover img{aspect-ratio:3/2;border-radius:var(--r-m,16px)}
 .bn-cta{padding:18px}.bn-btns{width:100%}.bn-btns .hm-btn{flex:1 1 100%}
 .bn-chips{flex-wrap:nowrap;overflow-x:auto;margin:0 -18px;padding:2px 18px 6px;scrollbar-width:none}.bn-chips::-webkit-scrollbar{display:none}.bn-chips a{flex:none}
}

/* 01/11 mobile QA: vùng chạm >=44px (thẻ chủ đề + liên kết Trang chủ) */
.bn-pill{position:relative}.bn-pill::after{content:"";position:absolute;left:-4px;right:-4px;top:-8px;bottom:-8px}
.bn-bc a{display:inline-flex;align-items:center;min-height:44px}