/* BLC: original page structure, with the curated public content. */
:root{--ink:#172d39;--dark:#172d39;--paper:#fff;--soft:#f1f4f3;--line:#dce3e3;--accent:#c54129}
body{background:#fff;font-size:16px;line-height:1.65}
.wrap{width:min(1200px,calc(100% - 64px))}
header.site-header{background:#fff;border:0}
.utility-bar{background:var(--dark);color:#e7eff0;font-size:12px;line-height:1.5}
.utility-bar>.wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:42px}
.utility-title{font-size:11px;letter-spacing:.04em}
.quick-links{display:flex;align-items:center;gap:26px}
.quick-links a{text-decoration:none;font-weight:600;padding:10px 0}
.quick-links a:hover{text-decoration:underline}
.quick-links a:first-child{color:#fff}
.header-inner{display:flex;align-items:center;gap:27px;min-height:112px}
.brand{flex-shrink:0;margin-right:auto}
.brand img{width:240px;height:auto}
.header-inner nav{display:flex;align-items:center;gap:23px;border:0;padding:0;justify-content:flex-end;font-size:13px}
.header-inner nav>a{padding:18px 0}
summary{list-style:none;cursor:pointer;font-weight:650}
summary::-webkit-details-marker{display:none}
.audience-menu{position:relative}
.audience-menu>summary{padding:18px 0;white-space:nowrap}
.audience-menu>summary:after{content:'⌄';font-size:12px;margin-left:6px;color:#62757b}
details[open]>summary{color:var(--accent)}
.dropdown{position:absolute;top:100%;left:-18px;min-width:245px;background:#fff;box-shadow:0 12px 32px #102c3926;border:1px solid var(--line);border-top:3px solid var(--accent);padding:9px;z-index:40}
.dropdown a{display:block;padding:11px 13px;text-decoration:none;font-size:13px;white-space:normal}
.dropdown a:hover,.dropdown a[aria-current]{background:#f0f4f3;color:var(--accent)}
.language-switch{position:relative;font-size:13px;flex-shrink:0}
.language-switch>summary{padding:8px 0}
.language-options{left:auto;right:0;min-width:150px}
summary:focus-visible{outline:3px solid #e56331;outline-offset:4px}
.hero{min-height:560px}
.hero:after{background:linear-gradient(90deg,rgba(12,32,43,.92) 0%,rgba(12,32,43,.65) 43%,rgba(12,32,43,.05) 100%)}
.hero-content{padding:70px 0 78px}
.hero .eyebrow{color:#f4c5ad;font-size:12px}
.hero h1{font-size:clamp(42px,4.5vw,64px);line-height:1.08;max-width:850px;letter-spacing:-.035em;font-weight:650}
.hero p{max-width:730px;font-size:18px;line-height:1.65}
.hero .actions{margin-top:29px}
.button{border-radius:2px;gap:16px;padding:13px 19px;font-size:13px}
.button.secondary{border-color:#b7c2c5}
.performance-band{background:#f2f5f4;border-bottom:1px solid var(--line)}
.performance-band .metrics{padding:34px 0 24px;border:0}
.metrics strong{font-size:36px}
.metrics span{font-size:12px}
.metrics .metricnote{font-size:11px}
.building-sectors{background:#fff}
.section{padding-top:64px;padding-bottom:54px}
.eyebrow{letter-spacing:.14em;font-size:11px;margin-bottom:15px}
h2{font-size:clamp(28px,3vw,38px);font-weight:650;letter-spacing:-.03em}
.sector-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:30px}
.sector-grid article{background:#f5f7f6;padding:32px 35px;border-top:3px solid var(--ink);display:flex;flex-direction:column;align-items:flex-start}
.sector-grid article+article{border-top-color:var(--accent)}
.sector-grid p{color:var(--muted);font-size:16px}
.sector-grid .number{margin-bottom:15px}
.sector-grid h2{font-size:28px}
.sector-grid .button{margin-top:auto}
.home-proof{padding-top:52px;border-top:1px solid var(--line)}
.proof-reference{margin-top:25px;border-left:3px solid var(--accent);background:#f3f6f5;padding:28px 32px}
.proof-reference h3{font-size:23px}
.proof-reference p{max-width:920px;color:var(--muted)}
.home-paths{padding-top:30px;padding-bottom:65px}
.cards{gap:24px}
.cards article{border:0;border-top:1px solid var(--line);padding:24px 0;background:transparent}
.cards article:not(:last-child){padding-right:24px}
.cards .number{margin-bottom:20px}
.cards h3{font-size:22px}
.tools-band{background:var(--dark);color:white}
.tools-band .split{border:0;margin-top:0;padding-block:58px;gap:70px;align-items:center}
.tools-band .eyebrow{color:#eeb59c}
.tools-band p{color:#c7d7dc;font-size:16px}
.tool-links{display:grid;gap:0}
.tool-links a{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:20px 0;border-bottom:1px solid #4c6068;text-decoration:none;font-size:18px}
.tool-links a:first-child{border-top:1px solid #4c6068}
.tool-links a:hover{color:#f4c5ad}
.tool-links b{font-weight:400}
.endcta{border:0;margin-top:0;padding-block:62px}
.endcta h2{font-size:32px}
.pagehead{padding-top:60px;padding-bottom:25px}
.pagehead h1{font-size:clamp(38px,4vw,52px);line-height:1.15;max-width:1000px}
.pagehead .lead{font-size:19px;max-width:950px}
.pagehead+.section{padding-top:24px}
footer{background:#102731;padding:46px max(32px,calc((100% - 1200px)/2))}
.footerlinks{font-size:13px;gap:9px 45px}
@media(max-width:1100px){.header-inner{gap:20px}.brand img{width:205px}.header-inner nav{gap:15px;font-size:12px}.hero h1{font-size:56px}.utility-title{font-size:10px}.quick-links{gap:22px}.quick-links a{font-size:11px}}
@media(max-width:1100px){.header-inner{position:relative;min-height:96px;gap:20px;flex-wrap:wrap;padding:13px 0}.brand img{width:235px}.menu-button{display:block;order:2;padding:8px 11px;font-size:12px}.language-switch{order:3}.header-inner nav{display:none;order:4;flex-basis:100%;width:100%;padding:8px 0 15px;flex-direction:column;align-items:stretch;gap:0}.header-inner nav.open{display:flex}.header-inner nav>a,.header-inner nav details{width:100%;font-size:15px}.header-inner nav>a{padding:10px 0}.audience-menu>summary{padding:10px 0}.audience-menu .dropdown{position:static;box-shadow:none;border:0;border-left:2px solid var(--accent);margin:0 0 10px;padding:0 6px;min-width:0}.audience-menu .dropdown a{width:100%;padding:10px 13px;font-size:14px}.utility-title{display:none}.utility-bar>.wrap{justify-content:center;min-height:40px}.quick-links{width:100%;justify-content:space-between;gap:15px}.quick-links a{font-size:12px}.sector-grid{gap:22px}.sector-grid article{padding:28px}.cards{grid-template-columns:repeat(3,1fr)}.cards article{padding:20px 0!important}.cards h3{font-size:21px}.cards p{font-size:15px}.hero h1{font-size:49px}.contact-grid{grid-template-columns:1fr}}
@media(max-width:600px){.wrap{width:calc(100% - 36px)}.utility-bar>.wrap{width:calc(100% - 26px);min-height:44px}.quick-links{gap:12px}.quick-links a{font-size:10px;padding-block:12px;white-space:nowrap}.quick-links a span{display:none}.header-inner{min-height:88px;gap:12px}.brand img{width:210px}.menu-button{margin:0;padding:7px 9px;font-size:11px}.language-switch{font-size:12px}.hero{min-height:565px}.hero-content{padding:48px 0 65px}.hero:after{background:linear-gradient(90deg,#0d2532e8,#0d25329c)}.hero h1{font-size:39px;line-height:1.12;letter-spacing:-.035em}.hero p{font-size:16px;line-height:1.65}.hero .eyebrow{font-size:10px}.hero .actions{gap:10px;flex-direction:row}.hero .button{min-width:0;padding:12px 14px;font-size:12px}.hero .button span{display:none}.hero .actions .button:first-child{flex-basis:100%;justify-content:center}.hero .actions .button.secondary{flex:1;justify-content:center;text-align:center}.image-note{font-size:8px;bottom:8px;left:12px}.performance-band .metrics{padding:28px 0 20px;gap:22px 14px}.metrics strong{font-size:30px}.metrics span{font-size:11px}.metrics .metricnote{font-size:10px}.sector-grid{grid-template-columns:1fr;gap:18px}.sector-grid article{padding:25px}.section{padding-block:42px}.home-proof{padding-top:35px}.proof-reference{padding:24px 22px}.proof-reference h3{font-size:22px}.proof-reference .actions{align-items:flex-start}.proof-reference .button{font-size:12px}.cards{grid-template-columns:1fr;gap:15px}.cards article{padding:22px 0!important}.home-paths{padding-top:18px;padding-bottom:35px}.tools-band .split{padding-block:42px;gap:20px}.tools-band h2{font-size:29px}.tool-links a{font-size:17px;padding:17px 0}.endcta{padding-block:42px}.endcta h2{font-size:29px}.pagehead{padding-top:40px;padding-bottom:15px}.pagehead h1{font-size:35px}.pagehead .lead{font-size:17px}.steps{grid-template-columns:1fr 1fr}.footerlinks{gap:10px 20px;font-size:12px}footer{padding:38px 20px}.header-inner nav{max-width:100%}}
@media(max-width:360px){.brand img{width:178px}.header-inner{gap:9px}.hero h1{font-size:35px}.quick-links a{font-size:9px}.quick-links{gap:8px}}

/* Full original navigation and dedicated road applications. */
.header-inner{gap:20px}.header-inner nav{gap:15px;font-size:12px}.brand img{width:210px}
.dropdown{min-width:255px;max-height:min(72vh,650px);overflow-y:auto}
.road-menu .dropdown{min-width:315px}
.property-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.property-card{padding:25px;background:#f3f6f5;border-top:2px solid var(--line)}
.property-card h2,.property-card h3{font-size:21px;line-height:1.3}.property-card p{font-size:15px;color:var(--muted)}
.property-heading{display:flex;gap:13px;align-items:center;margin-bottom:18px}
.property-number{font-size:25px;color:var(--accent)}.evidence{font-size:11px;font-weight:650;color:#52656c}.evidence.measured{color:#256248}
.road-section{display:grid;grid-template-columns:1fr 1fr;gap:55px;padding-block:45px;border-bottom:1px solid var(--line);scroll-margin-top:25px}
.road-section h2{font-size:30px}.road-section p{color:var(--muted)}
.road-section ul{margin:10px 0;padding-left:22px}.road-section li{margin-bottom:17px}
.page-toc{display:flex;gap:9px;flex-wrap:wrap;padding:12px 0 30px;border:0;justify-content:flex-start}
.page-toc a{width:auto!important;white-space:normal;background:#f1f4f3;border:1px solid var(--line);padding:10px 13px;font-size:13px}
.faq-list details{border-bottom:1px solid var(--line);padding:20px 0}
.faq-list summary{font-size:19px;padding:5px 0}.faq-list summary:after{content:' +';color:var(--accent)}
.faq-list details[open] summary:after{content:' −'}.faq-list p{margin:15px 0 5px;max-width:950px;color:var(--muted)}
.footerlinks{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px 30px;max-width:700px}
@media(max-width:1100px){.brand img{width:235px}.header-inner nav{font-size:15px;gap:0}.dropdown,.road-menu .dropdown{min-width:0;max-height:none}.property-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.road-section{gap:30px}.header-inner nav>details{border-bottom:1px solid var(--line)}.header-inner nav>details>summary{padding-block:14px}.header-inner nav>a{padding-block:14px;border-bottom:1px solid var(--line)}}
@media(max-width:600px){.brand img{width:210px}.header-inner{gap:12px}.property-grid{grid-template-columns:1fr}.road-section{grid-template-columns:1fr;gap:5px;padding-block:32px}.road-section h2{font-size:27px}.road-section ul{font-size:15px}.page-toc{display:flex}.page-toc a{font-size:12px}.footerlinks{grid-template-columns:1fr 1fr}.faq-list summary{font-size:18px}}
@media(max-width:360px){.brand img{width:178px}.header-inner{gap:9px}}

/* R5: reviewed documents, readable text and navigation targets. */
html{scroll-padding-top:24px}
h1,h2,h3,p,li,.footerlinks a{overflow-wrap:anywhere}
.topic-section{max-width:1000px;border-top:1px solid var(--line);scroll-margin-top:24px}
.topic-section p{max-width:900px;color:var(--muted)}
.document-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:25px 0}
.document-card{display:flex;flex-direction:column;gap:15px;border:1px solid var(--line);border-top:3px solid var(--accent);padding:24px;text-decoration:none;background:#f5f7f6}
.document-card:hover{background:#eaf0ed}.document-card strong{font-size:19px;line-height:1.4}.document-kind{font-size:12px;color:var(--muted)}
.reference-list article{border-left:2px solid var(--line);padding:10px 0 10px 22px;margin:22px 0}.reference-list p{max-width:950px;margin:8px 0;color:var(--muted)}
.menu-button,.language-switch>summary{min-height:44px;display:flex;align-items:center}
.menu-button{display:none}
@media(max-width:1100px){.menu-button{display:flex}.audience-menu .dropdown a{min-height:44px}}
@media(max-width:600px){.document-grid{grid-template-columns:1fr}.quick-links{display:flex;flex-wrap:wrap;gap:0 16px;justify-content:space-between}.quick-links a{padding:10px 0;min-height:44px;font-size:11px}.document-card{padding:22px}.image-note{font-size:10px}.metrics .metricnote{font-size:12px}.pagehead h1{hyphens:auto}}
@media(max-width:360px){.brand img{width:168px}.header-inner{gap:7px}}

/* Shared BLC presentation: technical content and grouped footer. */
.engineering-actions{margin-top:0;margin-bottom:24px}
.engineering-recognition{margin-top:0;margin-bottom:0;padding:28px 32px}
.engineering-recognition h2{font-size:26px}
.engineering-recognition p{margin-bottom:14px}
.pavement-figure{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:24px 40px;margin:25px 0 0;padding:30px;background:#f3f6f5;border:1px solid var(--line)}
.section-drawing{align-self:center}.section-drawing svg{display:block;width:100%;height:auto}
.section-legend{list-style:none;counter-reset:layer;padding:0;margin:0;display:grid;gap:16px}
.section-legend li{counter-increment:layer;position:relative;padding-left:38px;font-size:14px;line-height:1.5}
.section-legend li:before{content:counter(layer);position:absolute;left:0;top:0;border:1px solid var(--ink);border-radius:50%;width:26px;height:26px;display:grid;place-items:center;font-weight:650;background:white}
.section-legend strong,.section-legend span{display:block}.section-legend span{color:var(--muted);margin-top:4px}
.pavement-figure figcaption{grid-column:1/-1;border-top:1px solid var(--line);padding-top:20px;color:var(--muted);font-size:14px}
.evidence-notes{margin-top:25px;font-size:14px;color:var(--muted)}.evidence-notes h3{font-size:20px;color:var(--ink);margin-top:28px}
.data-gaps article{border-top-color:#9eadae!important}
.footerlinks{gap:30px;flex:1;max-width:700px}.footer-group{display:flex;flex-direction:column;gap:10px;min-width:0}.footer-group h2{font-size:14px;line-height:1.4;letter-spacing:0;color:white;margin-bottom:8px}.footer-group a{font-size:13px;line-height:1.6}
@media(max-width:800px){.pavement-figure{grid-template-columns:1fr;padding:22px}.section-drawing{max-width:550px}.section-legend{grid-template-columns:1fr 1fr}.footer-top{display:block}.footerlinks{margin-top:32px;max-width:none}}
@media(max-width:600px){.section-legend{grid-template-columns:1fr}.engineering-recognition{padding:24px 22px}.engineering-recognition h2{font-size:23px}.engineering-actions .button{max-width:100%}.footerlinks{grid-template-columns:1fr;gap:26px}.footer-group a{min-height:32px}.technical-table table{min-width:620px}.pavement-figure{padding:18px}.page-toc a{min-height:44px;display:flex;align-items:center}.evidence-notes{font-size:14px}}