:root {
  --ink:#172536; --muted:#647080; --paper:#fafaf8; --line:#dce1e5;
  --accent:#376493; --dark:#15283b; --soft:#eef2f5;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink); background:var(--paper); font-synthesis:none;
}
* {box-sizing:border-box}
body {margin:0;font-size:16px;line-height:1.65}
a {color:inherit;text-underline-offset:4px}
button,input,select {font:inherit}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible {outline:2px solid var(--accent);outline-offset:5px}
img,svg {max-width:100%}
img {height:auto}
h1,h2,h3,p {margin-top:0}
h1,h2,h3 {color:var(--ink);font-weight:500;line-height:1.15;letter-spacing:-.035em}
h1 {font-size:clamp(2.6rem,5.5vw,4.7rem)}
h2 {font-size:clamp(1.65rem,3vw,2.4rem)}
h3 {font-size:1.35rem}
p {margin-bottom:1.15em}
small {font-size:.78rem}
.wrap {max-width:1200px;margin:auto;padding:0 40px}
.site-header {border-bottom:1px solid var(--line);background:var(--paper)}
.site-nav {display:flex;align-items:center;justify-content:space-between;gap:24px;padding-top:23px;padding-bottom:23px}
.brand {display:flex;align-items:center;gap:10px;flex-shrink:0;font-size:1.15rem;font-weight:650;text-decoration:none;letter-spacing:-.045em}
.brand img {width:30px;height:30px}
.nav-links {display:flex;gap:29px;align-items:center;font-size:.8rem}
.nav-links a {text-decoration:none}
.nav-links a:hover {color:var(--accent)}
.skip {position:absolute;left:18px;top:-100px;z-index:9;background:white;padding:12px}
.skip:focus {top:12px}
.eyebrow,.label,.figure-heading>span,.finding-label {font:500 .67rem/1.5 "SFMono-Regular",Consolas,monospace;letter-spacing:.13em;text-transform:uppercase}
.eyebrow,.label {color:var(--accent)}
.hero {padding-top:76px;padding-bottom:76px;display:grid;grid-template-columns:1.12fr 1fr;gap:70px;align-items:center}
.hero h1 {margin:20px 0 25px}
.hero .lede {font-size:1.06rem;max-width:470px;color:var(--muted)}
.hero-note {font-size:.75rem;color:var(--muted);margin-top:25px}
.btn {display:inline-flex;align-items:center;justify-content:space-between;gap:28px;padding:12px 19px;border:1px solid var(--ink);background:var(--ink);color:white;text-decoration:none;font-weight:550;font-size:.8rem;cursor:pointer}
.btn.secondary {background:transparent;color:var(--ink);border-color:var(--line)}
.actions {display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:25px}
.feature {background:#fff;border:1px solid var(--line);padding:30px;text-decoration:none;display:block}
.feature:hover {border-color:var(--accent)}
.feature h2 {font-family:Georgia,"Times New Roman",serif;font-size:2.05rem;margin:20px 0;letter-spacing:-.03em}
.feature p {font-size:.81rem;color:var(--muted)}
.mini-chart {height:147px;display:flex;gap:25px;align-items:flex-start;margin:24px 0 15px;border-top:1px solid #bcc7d0;position:relative;padding:0 18px}
.mini-chart div {flex:1;position:relative;background:#234d7b;text-align:center}
.mini-chart div:nth-child(2) {background:#ac703f}
.mini-chart span {position:absolute;top:calc(100% + 8px);left:0;width:100%;font:500 .7rem/1.5 "SFMono-Regular",monospace;white-space:nowrap}
.feature .conclusion {border-top:1px solid var(--line);padding-top:20px;margin:36px 0 8px;color:var(--ink);font-size:.95rem;font-weight:550}
.strip {display:flex;gap:25px;justify-content:space-between;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-top:16px;padding-bottom:16px;font-size:.71rem;color:var(--muted)}
.section {padding-top:60px;padding-bottom:60px}
.section+.section {border-top:1px solid var(--line)}
.section-head {display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}
.section-head h2 {margin-bottom:10px}
.section-head p {color:var(--muted);font-size:.9rem;margin-bottom:0;max-width:640px}
.section-head>a {font-size:.8rem;white-space:nowrap}
.grid {display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid.two {grid-template-columns:repeat(2,1fr)}
.card {background:transparent;border-top:1px solid var(--line);padding:25px 0;display:flex;flex-direction:column;min-width:0}
.card .label {font-size:.62rem}
.card h3 {margin:14px 0;line-height:1.25;font-family:Georgia,"Times New Roman",serif;font-size:1.5rem}
.card p {font-size:.88rem;color:var(--muted)}
.card a {margin-top:auto;font-size:.8rem;font-weight:550}
.stamp {font-size:.69rem;color:var(--muted);margin:5px 0 20px}
.dark-band {background:var(--dark);color:#f4f7fa}
.dark-band h2,.dark-band h3 {color:#f4f7fa}
.dark-band p {color:#b9c7d4}
.dark-band .eyebrow {color:#9bbfe4}
.dark-band .btn {background:#edf3f9;border-color:#edf3f9;color:var(--ink)}
.split {display:grid;grid-template-columns:1.2fr 1fr;gap:70px;align-items:center}
.price {font-size:3.5rem;letter-spacing:-.06em;line-height:1}
.price small {font-size:.78rem;letter-spacing:0}
.product-box {border-left:1px solid #4c6175;padding:0 0 0 32px}
.product-box .label {color:#b8ccdf}
.footer {border-top:1px solid var(--line);padding:30px 0;font-size:.73rem;color:var(--muted)}
.footer nav {display:flex;flex-wrap:wrap;gap:22px;margin-bottom:16px}
.footer p {max-width:850px;margin-bottom:0;font-size:.69rem;line-height:1.65}
.article {max-width:900px;padding-top:48px;padding-bottom:64px}
.article h1 {font-family:Georgia,"Times New Roman",serif;font-size:clamp(2.4rem,4.4vw,3.75rem);line-height:1.09;letter-spacing:-.035em;margin:20px 0 22px;font-weight:400;text-wrap:balance}
.article .lede {font-size:1.1rem;line-height:1.65;color:var(--muted);max-width:740px}
.byline {display:flex;flex-wrap:wrap;gap:8px 20px;font-size:.7rem;color:var(--muted);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 0;margin:26px 0 35px}
.byline a {text-decoration:none}
.prose {min-width:0}
.prose h2 {font-size:1.5rem;letter-spacing:-.025em;line-height:1.3;margin-top:38px;margin-bottom:17px;font-weight:550}
.prose h3 {font-size:1.15rem;margin-top:27px}
.prose p,.prose li {font-size:1rem;line-height:1.8}
.prose a {color:var(--accent);overflow-wrap:anywhere}
.prose pre {max-width:100%;overflow:auto;font-size:.78rem;padding:18px;background:var(--soft);border:1px solid var(--line);white-space:pre-wrap}
.prose blockquote {border-left:2px solid var(--accent);margin:25px 0;padding-left:22px;color:var(--muted)}
.prose table {border-collapse:collapse;width:100%;font-size:.83rem;line-height:1.5;margin:20px 0;font-variant-numeric:tabular-nums}
.prose th,.prose td {border-bottom:1px solid var(--line);padding:13px 12px;text-align:left}
.prose th {font-size:.74rem;font-weight:600;background:var(--soft)}
.table-wrap {max-width:100%;overflow-x:auto}
.notice {border-left:2px solid #a98859;background:#f6f3ec;padding:16px 20px;margin:25px 0;font-size:.83rem;color:#695637}
.notice p:last-child {margin-bottom:0}
.verdict,.finding {border-left:2px solid var(--accent);background:var(--soft);padding:23px 25px;margin:30px 0}
.verdict strong {font-size:1.1rem}
.verdict p:last-child,.finding p:last-child {margin-bottom:0}
.finding-label {color:var(--accent);display:block;margin-bottom:11px}
.finding p {font-size:1.1rem;line-height:1.6;font-weight:500}
.metric-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:26px 0}
.metric {border-top:1px solid var(--line);padding:17px 0}
.metric strong {font-size:2rem;font-weight:500;display:block;letter-spacing:-.05em}
.metric span {font-size:.75rem;color:var(--muted)}
figure {margin:30px 0}
figcaption {font-size:.7rem;color:var(--muted);line-height:1.6;margin-top:14px}
.research-figure {background:white;border:1px solid var(--line);padding:24px 25px 19px;margin:30px 0}
.figure-heading {padding-bottom:18px}
.figure-heading>span {color:var(--accent)}
.prose .figure-heading h3 {font-family:Georgia,"Times New Roman",serif;font-size:1.6rem;font-weight:400;letter-spacing:-.025em;margin:11px 0 7px}
.prose .figure-heading p {color:var(--muted);font-size:.76rem;line-height:1.5;margin:0}
.research-figure img {display:block;width:100%;height:auto}
details {border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:17px 0;margin:28px 0}
summary {cursor:pointer;font-weight:550;font-size:.83rem}
details>div {padding-top:20px}
.method-notes p,.method-notes li,.correction-record p,.correction-record li {font-size:.84rem;line-height:1.75;color:var(--muted)}
.correction-record h2 {font-size:1.25rem}
.archive-list {list-style:none;padding:0;margin:0}
.archive-list li {padding:24px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:160px 1fr;gap:20px}
.archive-list a {font-family:Georgia,"Times New Roman",serif;font-size:1.25rem;font-weight:400;line-height:1.35;text-decoration:none;display:block}
.archive-list a:hover {color:var(--accent)}
.archive-list p {font-size:.76rem;color:var(--muted);margin:7px 0}
.archive-label {font-size:.64rem;color:var(--muted);text-transform:uppercase;letter-spacing:.09em}
.controls {display:flex;flex-wrap:wrap;gap:20px;background:var(--soft);padding:20px;border:1px solid var(--line)}
.controls label {display:grid;gap:7px;font-size:.8rem;flex:1;min-width:190px}
.controls select {background:white;border:1px solid var(--line);padding:10px}
.related {border-top:1px solid var(--line);padding-top:20px;margin-top:38px;display:flex;gap:20px;flex-wrap:wrap;font-size:.79rem;color:var(--muted)}
.related h2 {font-size:1.2rem}
.research-content .katex {font-size:1em}
.legacy-diagram {font-size:.8rem}
.proof {font-size:.73rem;color:var(--muted)}
.archive-intro {max-width:720px;color:var(--muted);font-size:.9rem}
.library-search {width:100%;padding:13px 16px;border:1px solid var(--line);background:white;color:var(--ink);margin:20px 0 10px}
.empty-results {color:var(--muted);padding:25px 0}
[hidden] {display:none!important}
@media(max-width:780px) {
  .wrap {padding-left:24px;padding-right:24px}
  .site-nav {align-items:flex-start;gap:16px;flex-direction:column;padding-top:19px;padding-bottom:18px}
  .nav-links {gap:18px;flex-wrap:wrap;font-size:.77rem}
  .hero {grid-template-columns:1fr;gap:34px;padding-top:40px;padding-bottom:42px}
  .hero h1 {font-size:clamp(2.8rem,10vw,3.7rem)}
  .feature {padding:25px}
  .grid,.grid.two,.split {grid-template-columns:1fr;gap:20px}
  .section {padding-top:40px;padding-bottom:40px}
  .section-head {align-items:start;flex-direction:column;gap:12px}
  .strip {flex-wrap:wrap;gap:8px 20px}
  .metric-grid {grid-template-columns:1fr}
  .metric {display:flex;align-items:center;gap:16px}
  .article {padding-top:30px}
  .article h1 {font-size:2.55rem}
  .article .lede {font-size:1rem}
  .prose h2 {font-size:1.3rem;margin-top:32px}
  .prose p,.prose li {font-size:.97rem;line-height:1.75}
  .research-figure {padding:18px 14px 15px;margin:27px -8px}
  .prose .figure-heading h3 {font-size:1.35rem}
  .prose .figure-heading p {font-size:.7rem}
  .prose th,.prose td {padding:11px 8px;font-size:.76rem}
  .byline {font-size:.66rem;gap:7px 16px;margin-bottom:28px}
  .mini-chart {height:135px}
  .product-box {border-left:0;border-top:1px solid #4c6175;padding:25px 0 0}
  .archive-list li {grid-template-columns:1fr;gap:6px}
  .archive-list p {margin:0 0 4px}
  .finding,.verdict {padding:19px 20px}
  .method-notes p,.method-notes li,.correction-record p,.correction-record li {font-size:.82rem}
}
@media print {
  @page {size:A4;margin:16mm}
  body {font-size:10pt;background:white;color:#172536}
  .site-header,.footer,.actions,.controls,.related,.skip,.proof,.library-search {display:none}
  .wrap,.article {max-width:none;padding:0}
  .article h1 {font-size:29pt}
  .article .lede {font-size:11pt}
  .prose h2 {font-size:15pt;margin-top:22px}
  .prose p,.prose li {font-size:10pt;line-height:1.6}
  .prose table {font-size:8pt;min-width:0}
  .prose th,.prose td {padding:7px}
  .table-wrap {overflow:visible;break-inside:avoid}
  .metric-grid {display:grid;grid-template-columns:repeat(3,1fr)}
  .metric strong {font-size:22pt}
  .metric span {font-size:8pt}
  .metric,.notice,.verdict,.finding,figure,tr {break-inside:avoid}
  .research-figure {padding:15px;margin:20px 0}
  .prose h2,.prose h3 {break-after:avoid}
  details::details-content {content-visibility:visible}
  details {border:0;padding:0}
  summary {margin-top:18px}
  a {color:inherit}
  .byline {font-size:8pt}
  .archive-list li {break-inside:avoid}
}
.hero-description {font-size:.9rem;color:var(--muted);max-width:460px}
.product-price {font-size:1.6rem;margin:15px 0}
.product-price span {font-size:.75rem;margin-left:9px}
.product-note {font-size:.71rem;margin:16px 0 0}
.archive-status {font-size:.76rem!important;color:var(--muted);border-left:2px solid #a98859;padding:8px 0 8px 16px;margin-bottom:28px}
@media print {
  :root,html,body {background:white}
  .research-figure img {max-height:155pt;object-fit:contain}
  .research-figure {padding:10pt;margin:14pt 0}
  .figure-heading {padding-bottom:8pt}
  .prose .figure-heading h3 {font-size:16pt;margin:6pt 0}
  .prose .figure-heading p,figcaption {font-size:7.5pt}
  .prose p {orphans:3;widows:3}
}
@media print {
  .method-notes {break-before:page}
  .method-notes summary {font-size:12pt;border-bottom:1px solid var(--line);padding-bottom:9pt;list-style:none}
}