:root{
  --k-ink:#0f2340;
  --k-navy:#103d74;
  --k-orange:#ff7a00;
  --k-red:#ef3b57;
  --k-bg:#ffffff;
  --k-soft:#f5f7fb;
  --k-soft-2:#fff8f9;
  --k-border:#e5ebf2;
  --k-muted:#657287;
  --k-shadow:0 24px 48px rgba(16,42,76,.08);
}
.knowledge-progress{position:fixed;top:0;right:0;left:0;height:3px;z-index:9999;background:transparent;pointer-events:none}
.knowledge-progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--k-orange),#ffb04d);box-shadow:0 0 14px rgba(255,122,0,.4)}
.knowledge-home,.engineering-article{background:#fff;color:var(--k-ink)}
.knowledge-home-hero{position:relative;overflow:hidden;padding:92px 0 84px;background:linear-gradient(180deg,#fff 0%,#fbfcfe 100%);border-bottom:1px solid #edf0f4}
.knowledge-home-hero:before{content:"";position:absolute;right:-120px;top:-120px;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(239,59,87,.08),rgba(239,59,87,0) 72%)}
.knowledge-home-hero:after{content:"";position:absolute;left:-160px;bottom:-180px;width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(255,122,0,.08),rgba(255,122,0,0) 75%)}
.knowledge-home-hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.knowledge-kicker,.article-category{display:inline-flex;align-items:center;gap:10px;width:max-content;border-radius:999px;border:1px solid rgba(239,59,87,.12);background:#fff6f8;color:#df3050;padding:9px 16px;font-size:.84rem;font-weight:850;box-shadow:0 12px 24px rgba(223,48,80,.06)}
.knowledge-kicker i{display:inline-block;width:13px;height:13px;border-radius:50%;background:var(--k-red);box-shadow:0 0 0 10px rgba(239,59,87,.08)}
.knowledge-home-copy h1{margin:20px 0 18px;font-size:clamp(2.3rem,5vw,4.5rem);line-height:1.28;font-weight:950;letter-spacing:-.04em;color:#10233e}
.knowledge-home-copy>p{max-width:720px;margin:0;color:#677386;font-size:1rem;line-height:2.05}
.knowledge-home-points{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.knowledge-home-points span{display:inline-flex;align-items:center;padding:10px 14px;border:1px solid #e5ebf2;border-radius:14px;background:#fff;font-size:.84rem;font-weight:760;color:#48566e}
.knowledge-home-visual{display:grid;place-items:center}
.knowledge-visual-card{width:100%;max-width:560px;border-radius:30px;background:linear-gradient(180deg,#fff 0%,#f9fbfd 100%);border:1px solid #edf0f4;box-shadow:var(--k-shadow);padding:18px}
.knowledge-visual-card img{width:100%;height:auto;display:block;border-radius:22px}
.knowledge-list-section{padding:84px 0 110px;background:#fff}
.knowledge-section-heading{display:flex;justify-content:space-between;gap:28px;align-items:end;margin-bottom:36px}
.knowledge-section-heading h2{margin:0;font-size:2rem;font-weight:950;line-height:1.3}
.knowledge-feature-card{display:grid;grid-template-columns:1.02fr .98fr;background:#fff;border:1px solid var(--k-border);border-radius:30px;overflow:hidden;box-shadow:var(--k-shadow)}
.knowledge-feature-image{min-height:380px;background:#f5f7fa;overflow:hidden;display:block}
.knowledge-feature-image img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.2,.7,.2,1)}
.knowledge-feature-card:hover .knowledge-feature-image img{transform:scale(1.02)}
.knowledge-feature-body{padding:42px 40px;display:flex;flex-direction:column;justify-content:center}
.knowledge-card-meta{display:flex;gap:9px;flex-wrap:wrap;color:#7c8797;font-size:.78rem}
.knowledge-card-meta span{background:#f6f8fb;padding:7px 10px;border-radius:999px;font-weight:780;color:#6b7689}
.knowledge-feature-body h2{margin:18px 0 12px;font-size:2rem;line-height:1.45;font-weight:950}
.knowledge-feature-body h2 a{color:var(--k-ink);text-decoration:none}
.knowledge-feature-body p{margin:0;color:#657184;line-height:2;font-size:.94rem}
.knowledge-read-link{display:inline-flex;align-items:center;gap:8px;width:max-content;margin-top:25px;color:var(--k-navy);font-weight:850;text-decoration:none}
.knowledge-read-link span{transition:transform .2s ease}
.knowledge-read-link:hover span{transform:translateX(-4px)}

.article-hero{position:relative;padding:56px 0 44px;background:linear-gradient(180deg,#fff 0%,#fbfcfe 100%);border-bottom:1px solid #edf0f4}
.article-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:28px;font-size:.86rem;color:#7a8798}
.article-breadcrumb a{color:#5e6d82;text-decoration:none}
.article-hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:44px;align-items:center}
.article-hero-copy h1{margin:18px 0 10px;font-size:clamp(2rem,4vw,3.4rem);line-height:1.3;font-weight:950;color:#10233e}
.article-en-title{font-size:1rem;color:#7b8796;font-weight:700;letter-spacing:.04em}
.article-dek{margin:20px 0 22px;color:#586679;font-size:1rem;line-height:2.04;max-width:760px}
.article-meta{display:flex;flex-wrap:wrap;gap:12px;color:#728097;font-size:.82rem}
.article-meta span{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#f6f8fb;border:1px solid #e6ebf2}
.article-hero-media{margin:0}
.article-hero-media img{width:100%;height:auto;display:block;border-radius:28px;border:1px solid #edf0f4;background:#f7f8fa;box-shadow:var(--k-shadow)}
.article-hero-media-illustrated{position:relative}
.article-shell{display:grid;grid-template-columns:270px minmax(0,1fr);gap:34px;padding-top:48px;padding-bottom:110px;align-items:start}
.article-toc{position:sticky;top:112px}
.article-toc-inner{background:#fff;border:1px solid var(--k-border);border-radius:24px;padding:22px 20px;box-shadow:0 18px 40px rgba(16,42,76,.06)}
.article-toc-inner strong{display:block;margin-bottom:14px;font-size:.95rem}
.article-toc-inner a{display:block;padding:10px 0;color:#5a6778;text-decoration:none;border-top:1px solid #eff3f7;font-size:.9rem}
.article-toc-inner a:first-of-type{border-top:none;padding-top:0}
.article-content{min-width:0}
.article-glance,.article-section,.article-summary,.article-sources{background:#fff;border:1px solid var(--k-border);border-radius:28px;box-shadow:0 18px 40px rgba(16,42,76,.04)}
.article-glance{padding:30px 32px;margin-bottom:24px;background:linear-gradient(135deg,#fff8f1 0%,#fff 100%)}
.glance-label{display:inline-flex;align-items:center;border-radius:999px;background:#fff1df;color:#c85c00;padding:7px 12px;font-size:.8rem;font-weight:850;margin-bottom:16px}
.article-glance p,.article-section p,.article-summary p,.article-sources li{color:#5b687a;line-height:2.04;font-size:.96rem}
.article-section{padding:34px 32px;margin-bottom:24px}
.article-section-title{display:flex;gap:16px;align-items:flex-start;margin-bottom:18px}
.article-section-title>span{display:inline-grid;place-items:center;width:42px;height:42px;border-radius:16px;background:#edf4fc;color:var(--k-navy);font-weight:900;flex:0 0 auto}
.article-section-title p{margin:0 0 4px;color:#ef6c00;font-weight:760;font-size:.82rem;line-height:1.6}
.article-section-title h2{margin:0;color:#10233e;font-size:1.6rem;font-weight:900;line-height:1.5}
.article-note{margin-top:24px;border-radius:20px;padding:20px 22px;background:#f7fafc;border:1px solid #e8edf4}
.article-note strong{display:block;margin-bottom:8px;font-size:1rem;color:#122a49}
.article-note p{margin:0}
.article-figure{margin:24px 0;border-radius:24px;overflow:hidden;background:#f8f9fb;border:1px solid #edf0f4}
.article-figure img{width:100%;height:auto;display:block}
.article-figure figcaption{padding:14px 18px;color:#758296;font-size:.82rem;background:#fff}
.formula-card{margin:24px 0;padding:24px;border:1px solid #e6ebf2;border-radius:22px;background:#fff}
.formula-card-primary{background:linear-gradient(135deg,#f8fbff 0%,#fff 100%)}
.formula-main{font-size:2rem;font-weight:850;color:#103d74;margin-bottom:12px;letter-spacing:.01em}
.formula-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:12px}
.formula-grid span{display:flex;align-items:center;padding:10px 12px;border-radius:14px;background:#f6f8fb;border:1px solid #ebeff5;color:#516073;font-size:.88rem}
.sign-grid,.application-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:20px}
.sign-card,.application-card{border:1px solid #e6ebf2;border-radius:20px;padding:20px;background:#fff;box-shadow:0 12px 26px rgba(16,42,76,.04)}
.sign-card strong,.application-card h3{display:block;margin-bottom:10px;color:#10233e;font-size:1rem}
.sign-card p,.application-card p{margin:0;color:#5f6d81;line-height:1.95;font-size:.9rem}
.sign-positive{background:linear-gradient(180deg,#f4fbf6 0%,#fff 100%)}
.sign-zero{background:linear-gradient(180deg,#fbfcfe 0%,#fff 100%)}
.sign-negative{background:linear-gradient(180deg,#fff7f6 0%,#fff 100%)}
.comparison-table table{width:100%;border-collapse:collapse;overflow:hidden}
.comparison-table th,.comparison-table td{padding:16px 14px;border-bottom:1px solid #edf0f4;text-align:right;vertical-align:top;line-height:1.9;color:#5c697c}
.comparison-table thead th{background:#f6f8fb;color:#10233e;font-weight:850}
.article-summary{padding:30px 32px;margin-bottom:24px;background:linear-gradient(135deg,#fff9f1 0%,#fff 100%)}
.article-summary h2,.article-sources h2{margin:0 0 16px;font-size:1.55rem;font-weight:900;color:#10233e}
.article-sources{padding:30px 32px}
.article-sources ol{margin:0;padding-right:18px}
.article-sources li+li{margin-top:10px}
.article-sources a{color:var(--k-navy);text-decoration:none}
.knowledge-motion-ready .knowledge-reveal{opacity:0;transform:translateY(24px)}
.knowledge-motion-ready .knowledge-reveal.is-visible{opacity:1;transform:none;transition:opacity .72s cubic-bezier(.2,.7,.2,1),transform .72s cubic-bezier(.2,.7,.2,1)}

@media (max-width:1100px){
  .knowledge-home-hero-grid,.article-hero-grid,.knowledge-feature-card{grid-template-columns:1fr}
  .article-shell{grid-template-columns:1fr}
  .article-toc{position:static;order:-1}
}
@media (max-width:768px){
  .knowledge-home-hero{padding:72px 0 62px}
  .knowledge-home-copy h1{font-size:2.3rem}
  .knowledge-feature-body{padding:28px 24px}
  .knowledge-feature-body h2{font-size:1.55rem}
  .knowledge-section-heading h2{font-size:1.6rem}
  .article-hero{padding:40px 0 30px}
  .article-hero-copy h1{font-size:2rem}
  .article-shell{padding-top:30px;padding-bottom:80px}
  .article-glance,.article-section,.article-summary,.article-sources{border-radius:22px}
  .article-glance,.article-section,.article-summary,.article-sources{padding:24px 20px}
  .article-section-title h2{font-size:1.3rem}
  .formula-grid,.sign-grid,.application-grid{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  .knowledge-motion-ready .knowledge-reveal{opacity:1;transform:none}
  .knowledge-motion-ready .knowledge-reveal.is-visible,.knowledge-feature-image img{transition:none!important}
}

/* ===== Knowledge visual + JT comparison refinement ===== */
.knowledge-subtitle{
  margin:-4px 0 16px;
  color:#d95f13;
  font-size:clamp(1rem,1.7vw,1.2rem);
  font-weight:850;
  line-height:1.8;
}
.knowledge-home-visual .knowledge-visual-card{
  background:linear-gradient(180deg,#fff 0%,#fbfcfe 100%);
  border-color:#edf1f5;
  box-shadow:0 20px 50px rgba(16,42,76,.07);
}
.knowledge-home-visual .knowledge-visual-card img{
  opacity:.78;
}
.knowledge-feature-image{
  display:flex;
  align-items:center;
  justify-content:center;
  background:#fbfcfe;
}
.knowledge-feature-image img{
  object-fit:contain;
  padding:12px;
  background:#fbfcfe;
}
.jt-compare{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:16px;
  margin:26px 0 22px;
  align-items:stretch;
}
.jt-compare-card{
  position:relative;
  min-height:220px;
  padding:28px 22px 24px;
  border:1px solid #e5eaf1;
  border-radius:24px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center;
  overflow:hidden;
  box-shadow:0 14px 28px rgba(16,42,76,.055);
}
.jt-compare-card::before{
  content:"";
  position:absolute;
  top:0;right:0;left:0;
  height:4px;
  background:#d7dde5;
}
.jt-cooling{background:linear-gradient(180deg,#f4fbf7 0%,#fff 100%)}
.jt-cooling::before{background:#59a776}
.jt-neutral{background:linear-gradient(180deg,#f7f9fc 0%,#fff 100%)}
.jt-neutral::before{background:#8794a7}
.jt-heating{background:linear-gradient(180deg,#fff6f4 0%,#fff 100%)}
.jt-heating::before{background:#d97864}
.jt-equation{
  width:100%;
  margin:0 0 16px;
  color:#10233e;
  font-family:Arial,"Times New Roman",serif;
  font-size:clamp(1.45rem,2.3vw,2rem);
  font-weight:800;
  line-height:1.25;
  white-space:nowrap;
  text-align:center;
  unicode-bidi:isolate;
}
.jt-equation sub{
  font-size:.54em;
  vertical-align:-.2em;
  margin-left:1px;
}
.jt-compare-card strong{
  margin-bottom:10px;
  color:#152b49;
  font-size:1rem;
  font-weight:900;
}
.jt-compare-card p{
  margin:0;
  max-width:250px;
  color:#667487;
  font-size:.88rem;
  line-height:1.9;
}
@media(max-width:900px){
  .jt-compare{grid-template-columns:1fr;gap:12px}
  .jt-compare-card{
    min-height:0;
    padding:22px 20px;
  }
  .jt-equation{
    font-size:1.7rem;
    margin-bottom:12px;
  }
  .jt-compare-card p{max-width:420px}
}
@media(max-width:560px){
  .jt-compare-card{border-radius:20px;padding:20px 16px}
  .jt-equation{font-size:1.55rem}
  .jt-compare-card strong{font-size:.95rem}
  .jt-compare-card p{font-size:.86rem;line-height:1.85}
}

/* Multiple weekly knowledge articles */
.knowledge-feature-card + .knowledge-feature-card{margin-top:28px}