:root{
  --bg:#181a20;
  --surface:#20232b;
  --surface-soft:#1d2027;
  --line:#343945;
  --line-soft:#2b303a;
  --text:#e5e7eb;
  --body:#bcc2cc;
  --muted:#8e96a2;
  --accent:#9baaba;
  --accent-strong:#c1cad4;
  --font:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--text);
  background:var(--bg);
  font-family:var(--font);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit}

.site-header{
  display:flex;
  width:min(1080px,calc(100% - 40px));
  min-height:68px;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  margin:0 auto;
  border-bottom:1px solid var(--line-soft);
}
.brand{
  display:flex;
  align-items:baseline;
  color:var(--text);
  text-decoration:none;
}
.brand-mark{
  display:grid;
  width:30px;
  height:30px;
  margin-right:9px;
  place-items:center;
  border:1px solid #46505d;
  border-radius:7px;
  background:#242832;
  color:var(--accent-strong);
  font-size:13px;
  font-weight:800;
}
.brand strong{font-size:17px;letter-spacing:-.02em}
.brand small{color:var(--muted);font-size:11px;font-weight:650}
.site-header nav{display:flex;align-items:center;gap:19px}
.site-header nav a{
  color:#9da4ae;
  font-size:12px;
  font-weight:650;
  text-decoration:none;
}
.site-header nav a:hover{color:var(--text)}
.lang-link{
  padding:6px 8px;
  border:1px solid var(--line);
  border-radius:6px;
  background:#1d2026;
}

main{width:min(1080px,calc(100% - 40px));margin:0 auto}
article{padding-top:clamp(48px,7vw,78px)}
.article-hero{max-width:840px}
.breadcrumbs{
  display:flex;
  gap:8px;
  margin-bottom:27px;
  color:#757d89;
  font-size:11px;
}
.breadcrumbs a{text-decoration:none}
.breadcrumbs a:hover{color:#aeb4bd}
.eyebrow{
  margin:0 0 11px;
  color:var(--accent);
  font-size:10px;
  font-weight:750;
  letter-spacing:.1em;
  text-transform:uppercase;
}
h1{
  max-width:850px;
  margin:0;
  color:#e8e9ec;
  font-size:clamp(36px,5vw,58px);
  font-weight:720;
  line-height:1.08;
  letter-spacing:-.035em;
}
.dek{
  max-width:760px;
  margin:22px 0 0;
  color:#aeb4bd;
  font-size:clamp(16px,1.7vw,18px);
  line-height:1.7;
}
.hero-rule{
  width:64px;
  height:2px;
  margin-top:28px;
  background:#596574;
}
.hero-rule i{display:none}

.takeaways{
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  gap:34px;
  margin-top:clamp(42px,6vw,66px);
  padding:24px 26px;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--surface-soft);
}
.takeaways h2{
  margin:0;
  color:#d9dce1;
  font-size:19px;
  font-weight:680;
  letter-spacing:-.02em;
}
.takeaways ul{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.takeaways li{
  position:relative;
  padding-left:17px;
  color:#adb4be;
  font-size:13px;
  line-height:1.55;
}
.takeaways li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:5px;
  height:5px;
  border-radius:50%;
  background:#7d8997;
}

.guide-visual{
  overflow:hidden;
  margin:18px 0 0;
  border:1px solid var(--line);
  border-radius:10px;
  background:#1d2027;
}
.guide-visual-stage{
  min-height:210px;
  padding:30px 34px;
  border-bottom:1px solid var(--line-soft);
  background:#1b1e24;
}
.guide-visual figcaption{
  display:grid;
  grid-template-columns:170px minmax(0,1fr);
  gap:28px;
  align-items:start;
  padding:19px 24px 21px;
}
.guide-visual figcaption>span{
  color:#8f99a5;
  font-size:9px;
  font-weight:750;
  letter-spacing:.11em;
  text-transform:uppercase;
}
.guide-visual figcaption strong{
  display:block;
  color:#d9dde2;
  font-size:15px;
  font-weight:670;
  line-height:1.35;
}
.guide-visual figcaption p{
  max-width:680px;
  margin:6px 0 0;
  color:#9fa7b2;
  font-size:12px;
  line-height:1.6;
}

.visual-anatomy{max-width:780px;margin:0 auto}
.digit-row{
  display:grid;
  grid-template-columns:repeat(8,minmax(0,1fr));
  gap:8px;
}
.digit-row span{
  display:grid;
  height:72px;
  place-items:center;
  border:1px solid #47515e;
  border-radius:8px;
  background:#232731;
  color:#d4d9df;
  font-size:20px;
  font-weight:700;
}
.digit-row .digit-extension{
  border-color:#665d4e;
  background:#292722;
  color:#c5b08a;
}
.range-lines{
  display:grid;
  grid-template-columns:3fr 1fr;
  gap:8px;
  margin-top:17px;
}
.range-line i{
  display:block;
  height:2px;
  margin-bottom:8px;
  background:#687584;
}
.range-line b{
  color:#929ba7;
  font-size:10px;
  font-weight:650;
}
.range-line--precise i{background:#8b7857}
.range-line--precise b{color:#ae9c7d}

.visual-process{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:22px;
  max-width:820px;
  margin:17px auto 0;
  padding:0;
  list-style:none;
}
.visual-process li{
  position:relative;
  min-height:120px;
  padding:18px;
  border:1px solid #3c424d;
  border-radius:9px;
  background:#22262e;
}
.visual-process li:not(:last-child)::after{
  content:"";
  position:absolute;
  top:50%;
  right:-23px;
  width:22px;
  height:1px;
  background:#59636f;
}
.visual-process li>span{
  color:#828d9a;
  font-size:9px;
  font-weight:750;
  letter-spacing:.1em;
}
.visual-process strong{
  display:block;
  margin-top:24px;
  color:#d7dbe0;
  font-size:14px;
  line-height:1.25;
}
.visual-process small{
  display:block;
  margin-top:5px;
  color:#929aa5;
  font-size:10px;
  line-height:1.4;
}

.visual-quality{
  position:relative;
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:10px;
  max-width:760px;
  margin:5px auto 0;
}
.visual-quality>div{
  display:flex;
  min-height:150px;
  align-items:center;
  flex-direction:column;
  justify-content:center;
  gap:14px;
  border:1px solid #3b424c;
  border-radius:9px;
  background:#21252d;
}
.visual-quality>div>span{
  display:flex;
  width:54px;
  height:54px;
  align-items:flex-end;
  justify-content:center;
  padding:9px;
  border:1px solid #46505c;
  border-radius:50%;
}
.visual-quality>div>span i{
  width:18px;
  height:calc(var(--signal-level) * 7px);
  max-height:35px;
  border-radius:3px 3px 1px 1px;
  background:#7c8997;
}
.visual-quality strong{color:#bfc5cd;font-size:11px;font-weight:650}
.visual-quality>b{
  position:absolute;
  top:calc(50% - 13px);
  left:calc(50% - 13px);
  display:grid;
  width:26px;
  height:26px;
  place-items:center;
  border:1px solid #665d4e;
  border-radius:50%;
  background:#282620;
  color:#b7a27d;
  font-size:13px;
}

.visual-boundaries{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  max-width:780px;
  margin:0 auto;
}
.boundary-list{
  min-height:155px;
  padding:20px 22px;
  border:1px solid #3c434d;
  border-radius:9px;
  background:#21252c;
}
.boundary-list>strong{
  display:flex;
  align-items:center;
  gap:9px;
  color:#d0d5db;
  font-size:13px;
}
.boundary-list>strong i{
  display:grid;
  width:23px;
  height:23px;
  place-items:center;
  border:1px solid #526071;
  border-radius:50%;
  color:#aebbc8;
  font-size:10px;
  font-style:normal;
}
.boundary-list--cannot>strong i{
  border-color:#665d4e;
  color:#c1aa80;
}
.boundary-list ul{display:grid;gap:7px;margin:17px 0 0;padding:0;list-style:none}
.boundary-list li{
  position:relative;
  padding-left:14px;
  color:#9ea6b0;
  font-size:11px;
  line-height:1.45;
}
.boundary-list li::before{
  content:"";
  position:absolute;
  top:.55em;
  left:0;
  width:4px;
  height:4px;
  border-radius:50%;
  background:#727e8c;
}

.article-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 270px;
  gap:clamp(45px,7vw,80px);
  margin-top:clamp(52px,7vw,76px);
}
.article-body{min-width:0}
.article-body>section{position:relative;margin-bottom:52px}
.section-number{
  display:block;
  margin-bottom:10px;
  color:#7e8896;
  font-size:10px;
  font-weight:750;
  letter-spacing:.1em;
}
.article-body h2,.related h2{
  margin:0 0 17px;
  color:#dde0e5;
  font-size:clamp(25px,3vw,34px);
  font-weight:680;
  line-height:1.2;
  letter-spacing:-.025em;
}
.article-body p{
  margin:0 0 17px;
  color:var(--body);
  font-size:17px;
  line-height:1.78;
}
blockquote{
  margin:58px 0;
  padding:22px 25px;
  border-left:3px solid #667382;
  background:#1d2027;
  color:#d4d8de;
  font-size:20px;
  font-weight:580;
  line-height:1.55;
  letter-spacing:-.01em;
}

.sources{
  padding:23px 24px;
  border:1px solid var(--line);
  border-radius:9px;
  background:#1d2027;
}
.sources h2,.article-faq h2{font-size:23px}
.sources p{font-size:13px;line-height:1.65}
.sources ul{display:grid;gap:8px;margin:18px 0 0;padding:0;list-style:none}
.sources a{
  color:#b8c3ce;
  font-size:12px;
  font-weight:650;
  text-decoration:underline;
  text-decoration-color:#56616e;
  text-underline-offset:3px;
}
.sources a:hover{color:#e0e4e8}
.article-faq details{border-top:1px solid var(--line)}
.article-faq details:last-child{border-bottom:1px solid var(--line)}
.article-faq summary{
  padding:17px 0;
  color:#d2d6dc;
  cursor:pointer;
  font-size:14px;
  font-weight:650;
  list-style:none;
}
.article-faq summary::after{content:"+";float:right;color:#8b95a2}
.article-faq details[open] summary::after{content:"−"}
.article-faq details p{padding-right:28px;font-size:15px}

aside{position:relative}
.aside-card{
  position:sticky;
  top:22px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--surface);
}
.aside-card>span{
  color:#929ca8;
  font-size:9px;
  font-weight:750;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.aside-card h2{
  margin:18px 0 11px;
  color:#dfe2e6;
  font-size:20px;
  font-weight:680;
  line-height:1.24;
  letter-spacing:-.02em;
}
.aside-card p,.aside-note p{color:#a9b0ba;font-size:12px;line-height:1.65}
.aside-card a{
  display:inline-flex;
  margin-top:8px;
  padding:9px 11px;
  border:1px solid #4b5663;
  border-radius:7px;
  background:#262b34;
  color:#d8dde3;
  font-size:11px;
  font-weight:700;
  text-decoration:none;
}
.aside-card a:hover{background:#2b313b}
.aside-note{
  margin-top:11px;
  padding:18px;
  border:1px solid var(--line-soft);
  border-radius:9px;
}
.aside-note strong{font-size:11px}
.aside-note p{margin:7px 0 0}

.related{padding:62px 0 80px}
.related-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:10px;
  margin-top:23px;
}
.related-grid a{
  display:flex;
  min-height:150px;
  flex-direction:column;
  padding:20px;
  border:1px solid var(--line-soft);
  border-radius:9px;
  background:#1c1f25;
  text-decoration:none;
}
.related-grid a:hover{border-color:#4b535f;background:#20232a}
.related-grid span{
  color:#858f9b;
  font-size:9px;
  font-weight:750;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.related-grid h3{
  margin:21px 0 12px;
  color:#d8dbe0;
  font-size:17px;
  font-weight:650;
  line-height:1.3;
}
.related-grid b{margin-top:auto;color:#9facb9;font-size:10px}

.hub-main{padding-top:clamp(48px,7vw,76px);padding-bottom:80px}
.hub-hero{max-width:820px}
.hub-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:10px;
  margin-top:clamp(42px,6vw,62px);
}
.hub-card,
.hub-card:nth-child(1),
.hub-card:nth-child(2){
  position:relative;
  display:flex;
  min-height:220px;
  flex-direction:column;
  grid-column:auto;
  padding:22px;
  border:1px solid var(--line-soft);
  border-radius:10px;
  background:#1d2027;
  text-decoration:none;
}
.hub-card-visual{
  position:absolute;
  top:18px;
  right:19px;
  display:grid;
  width:48px;
  height:24px;
  grid-template-columns:repeat(4,1fr);
  gap:3px;
  align-items:end;
}
.hub-card-visual i{
  display:block;
  height:11px;
  border:1px solid #4a5460;
  border-radius:2px;
  background:#252a33;
}
.hub-card-visual--anatomy i:nth-child(n+3){
  border-color:#665d4e;
  background:#292721;
}
.hub-card-visual--process i:nth-child(1){height:7px}
.hub-card-visual--process i:nth-child(2){height:11px}
.hub-card-visual--process i:nth-child(3){height:15px}
.hub-card-visual--process i:nth-child(4){height:20px}
.hub-card-visual--quality{align-items:center}
.hub-card-visual--quality i{
  height:12px;
  border-radius:50%;
}
.hub-card-visual--boundaries{
  grid-template-columns:1fr 1fr;
  gap:6px;
}
.hub-card-visual--boundaries i{height:18px}
.hub-card-visual--boundaries i:nth-child(n+3){display:none}
.hub-card:hover{border-color:#4b535f;background:#21242c}
.hub-index{
  color:#87919d;
  font-size:9px;
  font-weight:750;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.hub-card h2{
  margin:28px 0 11px;
  color:#dce0e5;
  font-size:22px;
  font-weight:680;
  line-height:1.22;
  letter-spacing:-.025em;
}
.hub-card p{margin:0;color:#aeb4bd;font-size:13px;line-height:1.65}
.hub-card b{margin-top:auto;padding-top:22px;color:#9facb8;font-size:10px}
.hub-principle{
  display:grid;
  grid-template-columns:145px minmax(0,1fr) auto;
  gap:22px;
  align-items:center;
  margin-top:10px;
  padding:20px 22px;
  border:1px solid var(--line);
  border-radius:9px;
  background:#20232a;
}
.hub-principle>span{
  color:#8e98a4;
  font-size:10px;
  font-weight:750;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.hub-principle p{margin:0;color:#adb4bd;font-size:13px;line-height:1.6}
.hub-principle a{
  padding:9px 11px;
  border:1px solid #4a5460;
  border-radius:7px;
  color:#d7dce2;
  font-size:10px;
  font-weight:700;
  text-decoration:none;
  white-space:nowrap;
}

footer{
  display:flex;
  width:min(1080px,calc(100% - 40px));
  min-height:94px;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  margin:0 auto;
  border-top:1px solid var(--line-soft);
}
footer>div{display:flex;flex-direction:column;gap:4px}
footer strong{font-size:14px}
footer span,footer a{color:#7f8792;font-size:10px;text-decoration:none}
footer nav{display:flex;gap:16px}

@media(max-width:860px){
  .article-layout{grid-template-columns:1fr}
  aside{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .aside-card{position:static}
  .hub-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hub-principle{grid-template-columns:1fr}
  .hub-principle a{justify-self:start}
  .guide-visual figcaption{grid-template-columns:130px minmax(0,1fr)}
}
@media(max-width:680px){
  .site-header{min-height:62px}
  .site-header nav a:nth-child(2){display:none}
  h1{font-size:36px}
  .takeaways{grid-template-columns:1fr;gap:18px;padding:21px}
  .article-layout{margin-top:54px}
  aside{grid-template-columns:1fr}
  .related-grid,.hub-grid{grid-template-columns:1fr}
  .hub-card,.hub-card:nth-child(1),.hub-card:nth-child(2){min-height:190px}
  .guide-visual-stage{min-height:0;padding:23px 20px}
  .guide-visual figcaption{grid-template-columns:1fr;gap:8px;padding:17px 19px 19px}
  .visual-process{grid-template-columns:1fr 1fr;gap:9px;margin:0}
  .visual-process li{min-height:104px}
  .visual-process li:not(:last-child)::after{display:none}
  .visual-quality{grid-template-columns:1fr 1fr}
  .visual-quality>div{min-height:115px}
  .visual-quality>b{display:none}
  footer{align-items:flex-start;flex-direction:column;justify-content:center}
}
@media(max-width:420px){
  .site-header,main,footer{width:min(100% - 28px,1080px)}
  .site-header nav{gap:11px}
  h1{font-size:32px}
  .dek{font-size:15px}
  .article-body p{font-size:16px;line-height:1.72}
  blockquote{padding:19px 21px;font-size:18px}
  .digit-row{gap:4px}
  .digit-row span{height:48px;border-radius:6px;font-size:14px}
  .range-line b{font-size:9px}
  .visual-boundaries{grid-template-columns:1fr}
}