/* 9Prep — bài viết dài "Khoa học đằng sau" (dùng lại mục lục .np-doc-toc trong core) */
.np-art-hero{position:relative;overflow:hidden;background:var(--np-dark);color:#fff;padding:72px 0 56px}
.np-art-hero::before{content:"";position:absolute;width:620px;height:620px;border-radius:50%;right:-160px;top:-360px;background:radial-gradient(circle,rgba(200,68,44,.26),rgba(200,68,44,0) 68%)}
.np-art-hero-in{position:relative;z-index:2;max-width:860px}
.np-art-hero .np-eyebrow{color:var(--np-yellow)}
.np-page main .np-art-hero h1{font-size:clamp(30px,3.8vw,48px);line-height:1.12;letter-spacing:-.04em;color:#fff;margin:0 0 16px;text-wrap:balance}
.np-art-hero h1 em{font-style:normal;color:var(--np-yellow)}
.np-page main .np-art-dek{font-size:17px;line-height:1.7;color:rgba(255,255,255,.74);max-width:62ch;margin:0 0 22px}
.np-art-byline{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13.5px;color:rgba(255,255,255,.55)}
.np-art-byline span:first-child{font-family:var(--np-display);font-weight:800;color:#fff}

.np-art{padding:56px 0 90px;background:var(--np-paper)}
.np-art-body{min-width:0}
.np-art-grid{display:grid;grid-template-columns:250px minmax(0,740px);gap:56px;justify-content:center;align-items:start}
.np-page main .np-art-body{font-size:17px;line-height:1.8}
.np-page main .np-art-body > p{margin:0 0 18px}
.np-page main .np-art-lead{font-size:19px;line-height:1.7;color:var(--np-ink)}
.np-page main .np-art-body h2{font-size:clamp(25px,2.6vw,32px);line-height:1.2;letter-spacing:-.03em;margin:6px 0 18px;scroll-margin-top:calc(var(--np-topbar-h) + 20px)}
.np-page main .np-art-body h3{font-size:19px;line-height:1.4;margin:34px 0 12px}
.np-part{margin:64px 0 10px;display:flex;align-items:center;gap:12px}
.np-part::after{content:"";flex:1;height:1px;background:var(--np-line)}
.np-part span{font-family:var(--np-display);font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--np-brand)}
.np-page main ol.np-art-outline{margin:0 0 20px;padding:18px 20px 18px 42px;background:var(--np-cream);border:1px solid var(--np-line);border-radius:14px}
.np-page main ol.np-art-outline li{margin:0 0 6px}
.np-cites{font-size:.68em;line-height:0;margin-left:2px;white-space:nowrap}
.np-page main a.np-cite{color:var(--np-brand);text-decoration:none;font-weight:700}
.np-page main a.np-cite:hover{text-decoration:underline}

.np-art-cols{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:6px 0 22px}
.np-art-col{background:var(--np-cream);border:1px solid var(--np-line);border-radius:14px;padding:18px 20px}
.np-art-col-h{font-family:var(--np-display);font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--np-brand);margin-bottom:10px}
.np-page main .np-art-col ul{margin:0;padding-left:18px}
.np-page main .np-art-col li{font-size:15px;line-height:1.55;margin-bottom:7px}

.np-page main blockquote.np-art-quote{margin:26px 0;padding:22px 24px;background:var(--np-dark);color:rgba(255,255,255,.85);border:0;border-radius:14px;font-size:18px;line-height:1.6}
.np-page main blockquote.np-art-quote strong{color:var(--np-yellow)}
.np-page main .np-art-note{margin:22px 0;padding:16px 20px;background:var(--np-yellow-soft);border-left:4px solid var(--np-yellow);border-radius:8px;font-size:16px;line-height:1.65}

/* sơ đồ */
.np-page main .np-fig{margin:28px 0 30px;padding:22px 22px 18px;background:#fff;border:1px solid var(--np-line);border-radius:16px;box-shadow:0 10px 28px rgba(46,35,25,.05)}
.np-fig-h{display:flex;flex-direction:column;gap:3px;margin-bottom:18px;font-family:var(--np-display);font-size:16px;font-weight:800;color:var(--np-ink)}
.np-fig-h span{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--np-brand)}
.np-page main .np-fig-cap{margin:16px 0 0;padding-top:14px;border-top:1px dashed var(--np-line);font-size:14px;line-height:1.6;color:var(--np-muted)}

.np-load{border:1.5px solid var(--np-ink);border-radius:10px;padding:14px;background:var(--np-cream)}
.np-load-cap{font-family:var(--np-display);font-size:10.5px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--np-muted);margin-bottom:10px}
.np-load-row{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.np-load-row:last-child{margin-bottom:0}
.np-load-bar{flex:0 0 auto;min-width:14px;height:36px;display:flex;align-items:center;padding:0 12px;border-radius:6px;font-family:var(--np-display);font-size:13px;font-weight:800;color:#fff;white-space:nowrap}
.np-l-in{background:var(--np-brand)}.np-l-ex{background:var(--np-ink)}.np-l-ge{background:var(--np-green);padding:0}
.np-load-txt{font-size:13.5px;line-height:1.4;color:var(--np-ink2)}
.np-load-txt b{color:var(--np-green)}

.np-curve{display:block;width:100%;height:90px;margin-bottom:6px}
.np-stages{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.np-stage{padding:14px;border:1px solid var(--np-line);border-radius:12px;background:var(--np-cream)}
.np-stage-n{font-family:var(--np-display);font-size:15px;font-weight:800;color:var(--np-ink)}
.np-stage-t{font-family:var(--np-display);font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--np-brand);margin:3px 0 10px}
.np-stage-t.is-auto{color:var(--np-green)}
.np-page main .np-stage p{font-size:13.5px;line-height:1.55;margin:0 0 7px;color:var(--np-ink2)}
.np-stage em{font-style:normal;font-weight:700;color:var(--np-brand)}

.np-layers{display:grid;gap:10px;margin:8px 0 22px}
.np-layer{display:flex;gap:14px;align-items:flex-start;padding:14px 16px;border:1px solid var(--np-line);border-radius:12px;background:#fff}
.np-layer > span{flex:0 0 32px;height:32px;display:grid;place-items:center;border-radius:9px;background:var(--np-cream2);font-family:var(--np-display);font-weight:800;font-size:13px}
.np-layer b{font-family:var(--np-display);font-size:15px}
.np-page main .np-layer p{margin:3px 0 0;font-size:14.5px;line-height:1.55;color:var(--np-ink2)}
.np-layer.is-key{border-color:var(--np-brand);background:#fffaf8}
.np-layer.is-key > span{background:var(--np-brand);color:#fff}

.np-bi{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.np-bi-col{padding:16px;border:1px solid var(--np-line);border-radius:12px;background:var(--np-cream)}
.np-bi-t{font-family:var(--np-display);font-size:16px;font-weight:800;margin-bottom:10px}
.np-bi-t small{display:block;font-family:var(--np-sans);font-size:12.5px;font-weight:500;color:var(--np-muted)}
.np-chips{display:flex;gap:5px;margin-bottom:12px}
.np-chips i{flex:1;height:34px;display:grid;place-items:center;border-radius:6px;font-style:normal;font-family:var(--np-display);font-size:11px;font-weight:800;color:#fff}
.np-chips .c1{background:var(--np-brand)}.np-chips .c2{background:var(--np-ink)}.np-chips .c3{background:var(--np-green)}
.np-page main .np-bi-col ul{list-style:none;margin:0 0 10px;padding:0}
.np-page main .np-bi-col li{font-size:13.5px;font-weight:600;margin:0 0 4px;padding-left:20px;position:relative}
.np-bi-col li::before{position:absolute;left:0;font-weight:800}
.np-bi-col li.ok{color:var(--np-green)}.np-bi-col li.ok::before{content:"✓"}
.np-bi-col li.bad{color:var(--np-brand)}.np-bi-col li.bad::before{content:"✕"}
.np-bi-col li.mid{color:#8a6a1f}.np-bi-col li.mid::before{content:"~"}
.np-page main .np-bi-col p{font-size:13.5px;line-height:1.55;margin:0;color:var(--np-ink2)}
.np-bi-foot{margin-top:14px;padding:14px 16px;background:var(--np-yellow);border-radius:10px;font-size:14.5px;line-height:1.5;text-align:center;color:var(--np-ink)}

.np-page main ol.np-phases{margin:6px 0 22px;padding:0;list-style:none;counter-reset:ph}
.np-page main ol.np-phases li{counter-increment:ph;position:relative;margin:0 0 10px;padding:14px 16px 14px 56px;border:1px solid var(--np-line);border-radius:12px;font-size:15.5px;line-height:1.55}
.np-phases li::before{content:counter(ph);position:absolute;left:16px;top:13px;width:28px;height:28px;display:grid;place-items:center;border-radius:8px;background:var(--np-brand);color:#fff;font-family:var(--np-display);font-weight:800;font-size:13px}

/* bảng */
.np-table-wrap{margin:8px 0 22px;overflow-x:auto;border:1px solid var(--np-line);border-radius:14px}
.np-page main .np-art-table{width:100%;min-width:560px;margin:0;border-collapse:collapse;font-size:14.5px;line-height:1.5}
.np-page main .np-art-table th,.np-page main .np-art-table td{padding:12px 14px;border:0;border-bottom:1px solid var(--np-line);vertical-align:top;text-align:left}
.np-page main .np-art-table tr:last-child td{border-bottom:0}
.np-page main .np-art-table th{background:var(--np-cream);font-family:var(--np-display);font-size:12.5px;font-weight:800;letter-spacing:.04em;color:var(--np-ink)}
.np-art-table small{display:block;margin-top:3px;font-size:12px;color:var(--np-muted)}
.np-art-table em{font-style:italic;color:var(--np-ink)}
.np-art-table .np-yes{color:var(--np-green);font-weight:700}
.np-art-table .np-no{color:var(--np-brand);font-weight:600}
.np-art-table .np-mid{color:#8a6a1f;font-weight:600}
.np-map td:first-child{width:30%}

.np-art-cta{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:40px 0 56px;padding:24px 26px;background:var(--np-dark);border-radius:18px;color:#fff}
.np-art-cta b{font-family:var(--np-display);font-size:19px}
.np-page main .np-art-cta p{margin:4px 0 0;font-size:14.5px;color:rgba(255,255,255,.7)}
.np-page main ol.np-refs{margin:0;padding-left:26px;font-size:14px;line-height:1.6;color:var(--np-ink2)}
.np-page main ol.np-refs li{margin:0 0 10px;padding-left:4px;scroll-margin-top:calc(var(--np-topbar-h) + 20px)}
.np-refs li:target{background:var(--np-yellow-soft);border-radius:4px}

@media (max-width:980px){
  .np-art-grid{grid-template-columns:minmax(0,1fr);gap:26px}
}
@media (max-width:680px){
  .np-art-hero{padding:52px 0 40px}
  .np-art{padding:32px 0 64px}
  .np-page main .np-art-body{font-size:16.5px}
  .np-art-cols,.np-bi,.np-stages{grid-template-columns:1fr}
  .np-curve{display:none}
  .np-art-cta{flex-direction:column;align-items:stretch}
  .np-load-row{flex-direction:column;align-items:flex-start;gap:4px}
  .np-load-bar{max-width:100%}
}