:root{
  color-scheme:light only;
  --bg:#ffffff; --bg-soft:#f6f7f9; --ink:#161b26; --muted:#5b6472;
  --line:#e6e8ec; --line-strong:#161b26; --focus:#161b26;
  --accent-a:#38bdf8; --accent-b:#34d399; --radius:14px; --maxw:1180px;
  font-size:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:#fff}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;line-height:1.62;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%} a{color:inherit} .wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
h1,h2,h3{font-weight:800;letter-spacing:-.02em;margin:0;line-height:1.08} h1{font-size:clamp(36px,5vw,62px)} h2{font-size:clamp(29px,3.6vw,44px)} h3{font-size:20px}
p{margin:0 0 16px}.eyebrow{font-weight:700;font-size:13px;letter-spacing:.08em;text-transform:uppercase;margin:0 0 14px}.lede{color:var(--muted);font-size:19px;max-width:760px;margin:18px 0 0}.small{color:var(--muted);font-size:14px}.muted{color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:8px;border:none;cursor:pointer;font-weight:700;font-size:16px;padding:15px 26px;border-radius:10px;text-decoration:none;font-family:inherit;transition:.2s ease}.btn-primary{background:var(--ink);color:#fff}.btn-primary:hover{background:#2a3244;transform:translateY(-2px);box-shadow:0 8px 18px rgba(22,27,38,.14)}.btn-ghost{background:#fff;color:var(--ink);border:1.5px solid var(--line-strong)}.btn-ghost:hover{background:#f1f3f5;transform:translateY(-2px)}.btn:focus-visible,a:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:16px 28px;max-width:var(--maxw);margin:0 auto}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;text-decoration:none;white-space:nowrap}.brand img{width:34px;height:34px;border-radius:8px}.navlinks{display:flex;align-items:center;gap:24px;list-style:none;margin:0;padding:0}.navlinks a{text-decoration:none;font-weight:650;font-size:14.5px}.navlinks a:hover{color:var(--muted)}.nav-cta{display:flex;align-items:center;gap:12px}
.breadcrumbs{padding:22px 0 0;font-size:14px;color:var(--muted)}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0}.breadcrumbs li:not(:last-child)::after{content:"/";margin-left:8px;color:#a3a9b3}.breadcrumbs a{text-decoration:none}.breadcrumbs a:hover{text-decoration:underline}
.hero{padding:68px 0 62px;border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:46px;align-items:center}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.diagnostic-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:22px;padding:30px}.diagnostic-card .label{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:18px}.diagnostic-card ul{list-style:none;padding:0;margin:0}.diagnostic-card li{padding:12px 0;border-top:1px solid var(--line);font-weight:650}.diagnostic-card li:first-child{border-top:0}.diagnostic-card li span{display:block;color:var(--muted);font-weight:500;font-size:14px;margin-top:3px}
.block{padding:76px 0;border-bottom:1px solid var(--line)}.block-soft{background:var(--bg-soft)}.section-head{max-width:760px;margin-bottom:34px}.grid-2,.grid-3,.grid-4{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.card{background:#fff;padding:30px}.card h3{margin-bottom:12px}.card p{color:var(--muted);margin:0}.card .cat{font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}.card-link{display:block;text-decoration:none}.card-link:hover{background:var(--bg-soft)}.card-link .view{display:inline-block;margin-top:18px;font-size:14px;font-weight:800}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}.content h2{margin-bottom:20px}.content h3{margin:30px 0 10px}.content p,.content li{color:var(--muted)}.content strong{color:var(--ink)}.content ul{padding-left:20px}.content li{margin:8px 0}
.scope-list{border-top:1px solid var(--line)}.scope-item{display:grid;grid-template-columns:180px 1fr;gap:24px;padding:20px 0;border-bottom:1px solid var(--line)}.scope-item strong{font-size:15px}.scope-item p{margin:0;color:var(--muted)}
.site-map{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}.site-map ul{list-style:none;margin:0;padding:0}.site-map>ul>li{font-weight:800;padding:10px 0}.site-map ul ul{margin:8px 0 0 20px;padding-left:18px;border-left:1px solid var(--line)}.site-map ul ul li{font-weight:550;color:var(--muted);padding:7px 0}
.product-map{border-radius:24px;padding:34px 38px;min-height:100%;display:flex;flex-direction:column;justify-content:center}.product-map .map-kicker{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 18px}.product-map>ul>li{font-size:25px;letter-spacing:-.02em;padding:0}.product-map ul ul{margin-top:16px;margin-left:26px;padding-left:28px}.product-map ul ul li{font-size:20px;padding:9px 0;color:var(--muted)}.product-map ul ul ul{margin-top:8px;margin-bottom:8px}.product-map ul ul ul li{font-size:18px;padding:7px 0}.product-map .map-note{margin:24px 0 0;padding-top:20px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}.product-map .map-count{display:inline-flex;align-self:flex-start;margin-bottom:20px;padding:7px 11px;border-radius:999px;background:var(--bg-soft);font-size:13px;font-weight:800}
.note{margin-top:28px;padding:24px 26px;border-left:4px solid var(--ink);background:var(--bg-soft);border-radius:0 var(--radius) var(--radius) 0}.note p:last-child{margin-bottom:0}
.cta{padding:68px 0}.cta-box{background:var(--ink);color:#fff;border-radius:22px;padding:40px;display:flex;justify-content:space-between;gap:28px;align-items:center}.cta-box p{color:#d7dce4;margin:10px 0 0;max-width:700px}.cta-box .btn{background:#fff;color:var(--ink)}
.related{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}.pill{display:inline-flex;padding:9px 13px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-size:14px;font-weight:700;background:#fff}.pill:hover{background:var(--bg-soft)}
.article-wrap{max-width:900px}.article-meta{display:flex;flex-wrap:wrap;gap:10px 18px;margin-top:24px;color:var(--muted);font-size:14px}.article-body h2{margin:52px 0 18px}.article-body h3{margin:32px 0 12px}.article-body p,.article-body li{color:var(--muted)}.article-body ul,.article-body ol{padding-left:24px;margin:0 0 22px}.article-body li{margin:9px 0}.article-body strong{color:var(--ink)}.article-body a{font-weight:700}.article-body .note{margin:30px 0}.article-toc{margin:0 0 34px;padding:26px 30px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-soft)}.article-toc h2{font-size:21px;margin:0 0 14px}.article-toc ol{margin:0;padding-left:22px}.article-toc li{margin:7px 0}.checklist{border-top:1px solid var(--line);margin:24px 0}.checklist li{list-style:none;padding:13px 0 13px 34px;border-bottom:1px solid var(--line);position:relative}.checklist li::before{content:"✓";position:absolute;left:4px;top:13px;font-weight:800;color:var(--ink)}.article-sources{font-size:14px;padding-top:24px;border-top:1px solid var(--line)}
.study-hero{padding:64px 0 54px}.study-hero .article-wrap{max-width:980px}.study-lead{font-size:21px;line-height:1.55;max-width:900px}.study-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin-top:34px}.study-stat{background:#fff;padding:24px}.study-stat strong{display:block;font-size:clamp(28px,4vw,42px);letter-spacing:-.04em;line-height:1}.study-stat span{display:block;color:var(--muted);font-size:13px;margin-top:9px}.study-disclaimer{margin:28px 0;padding:22px 24px;border-left:4px solid var(--ink);background:var(--bg-soft);border-radius:0 var(--radius) var(--radius) 0}.study-disclaimer p{margin:0}.study-chart{margin:32px 0 42px;padding:28px;border:1px solid var(--line);border-radius:18px;background:#fff}.study-chart figcaption{margin-bottom:24px}.study-chart figcaption strong{display:block;font-size:20px}.study-chart figcaption span{display:block;color:var(--muted);font-size:14px;margin-top:4px}.compare-bars{display:grid;gap:18px}.compare-row{display:grid;grid-template-columns:112px 1fr 64px;gap:14px;align-items:center}.compare-row>span:first-child{font-weight:750}.compare-track{height:22px;background:var(--bg-soft);border-radius:999px;overflow:hidden}.compare-fill{height:100%;background:var(--ink);border-radius:999px}.compare-fill.mobile{background:var(--ink)}.compare-value{text-align:right;font-weight:800}.issue-bars{display:grid;gap:15px}.issue-row{display:grid;grid-template-columns:minmax(220px,1.1fr) 2fr 62px;gap:14px;align-items:center}.issue-row>span:first-child{font-size:14px;font-weight:650}.issue-track{height:14px;background:var(--bg-soft);border-radius:999px;overflow:hidden}.issue-fill{height:100%;background:var(--ink);border-radius:999px}.issue-value{text-align:right;font-size:14px;font-weight:800}.method-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:32px 0 42px}.method-step{padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-soft)}.method-step strong{display:block;font-size:28px;letter-spacing:-.03em}.method-step span{display:block;color:var(--muted);font-size:14px;margin-top:5px}.research-card{display:grid;grid-template-columns:1.15fr .85fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin-top:30px}.research-card>div{background:#fff;padding:34px}.research-card .research-data{background:var(--ink);color:#fff;display:grid;grid-template-columns:1fr 1fr;gap:22px}.research-data strong{display:block;font-size:32px;letter-spacing:-.04em}.research-data span{display:block;color:#cbd1da;font-size:13px;margin-top:4px}.research-card h3{font-size:27px;margin:8px 0 14px}.research-card p{color:var(--muted)}.research-card .view{display:inline-block;margin-top:12px;font-size:14px;font-weight:800}.faq-list details{border-top:1px solid var(--line);padding:18px 0}.faq-list details:last-child{border-bottom:1px solid var(--line)}.faq-list summary{cursor:pointer;font-weight:800}.faq-list details p{margin:12px 0 0}.reader-note{font-size:14px;color:var(--muted);margin-top:22px}
footer{padding:48px 0}.footer-grid{display:grid;grid-template-columns:1.2fr repeat(3,1fr);gap:36px}.footer-brand p{color:var(--muted);font-size:14px;max-width:280px;margin-top:12px}.footer-col h3{font-size:14px;margin-bottom:12px}.footer-col ul{list-style:none;padding:0;margin:0}.footer-col li{margin:9px 0}.footer-col a{font-size:14px;color:var(--muted);text-decoration:none}.footer-col a:hover{color:var(--ink);text-decoration:underline}.footer-row{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:30px;margin-top:34px;border-top:1px solid var(--line)}.footer-links{display:flex;gap:22px;list-style:none;padding:0;margin:0;flex-wrap:wrap}.footer-links a{font-size:14px;font-weight:600;color:var(--muted);text-decoration:none}.footer-links a:hover{color:var(--ink);text-decoration:underline}.footer-copy{font-size:14px;color:var(--muted)}.footer-copy a{font-size:inherit;color:inherit;text-decoration:underline}
@media(max-width:960px){.navlinks{display:none}.hero-grid{grid-template-columns:1fr}.diagnostic-card{max-width:620px}.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.study-summary{grid-template-columns:1fr 1fr}.research-card{grid-template-columns:1fr}.method-flow{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.wrap{padding:0 20px}.nav{padding:14px 20px}.nav-cta .btn-ghost{display:none}.nav-cta .btn{padding:11px 14px;font-size:14px}.hero{padding:50px 0}.block{padding:58px 0}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.scope-item{grid-template-columns:1fr;gap:5px}.cta-box{padding:30px;display:block}.cta-box .btn{margin-top:22px}.footer-grid{grid-template-columns:1fr}.footer-row{display:block}.footer-links{margin-bottom:14px}.product-map{padding:28px 24px}.product-map>ul>li{font-size:22px}.product-map ul ul{margin-left:14px;padding-left:20px}.product-map ul ul li{font-size:18px}.product-map ul ul ul li{font-size:16px}.study-summary{grid-template-columns:1fr 1fr}.study-stat{padding:19px}.study-chart{padding:22px 18px}.compare-row{grid-template-columns:82px 1fr 52px;gap:9px}.issue-row{grid-template-columns:1fr 48px}.issue-row>span:first-child{grid-column:1/-1}.method-flow{grid-template-columns:1fr}.research-card .research-data{grid-template-columns:1fr 1fr;padding:26px}.study-lead{font-size:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition-duration:.001ms!important}}