:root {
  --bt-navy: #071942;
  --bt-navy-2: #0e2b5d;
  --bt-blue: #1e4d7c;
  --bt-gold: #c6a260;
  --bt-gold-light: #ead8ad;
  --bt-orange: #c94323;
  --bt-ink: #101828;
  --bt-muted: #667085;
  --bt-steel: #dde2e8;
  --bt-paper: #f7f6f2;
  --bt-white: #ffffff;
  --bt-shell: 1240px;
  --bt-header: 86px;
  --bt-shadow: 0 24px 64px rgba(7, 25, 66, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.bt-site { margin: 0; color: var(--bt-ink); background: #f2f2f2; font-family: Arial, Helvetica, sans-serif; font-size: 1rem; line-height: 1.65; -webkit-font-smoothing: antialiased; }
body.bt-nav-open { overflow: hidden; }
.bt-site img { display: block; max-width: 100%; height: auto; }
.bt-site a { color: inherit; }
.bt-site button, .bt-site input, .bt-site select, .bt-site textarea { font: inherit; }
.bt-site :focus-visible { outline: 3px solid var(--bt-gold); outline-offset: 3px; }
.bt-shell { width: min(calc(100% - 48px), var(--bt-shell)); margin-inline: auto; }
.bt-main { overflow: visible; overflow-x: clip; }
.bt-skip-link { position: fixed; z-index: 9999; top: 12px; left: 12px; padding: 12px 18px; color: var(--bt-navy); background: var(--bt-white); box-shadow: var(--bt-shadow); transform: translateY(-150%); }
.bt-skip-link:focus { transform: none; }
.screen-reader-text { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.bt-header { position: absolute; z-index: 100; top: 0; left: 0; right: 0; color: var(--bt-navy); background: rgba(255,255,255,.92); border-bottom: 1px solid rgba(7,25,66,.08); transition: background-color .25s ease, box-shadow .25s ease; }
.bt-header.is-scrolled { position: fixed; background: rgba(255,255,255,.98); box-shadow: 0 10px 32px rgba(7, 25, 66, .1); }
.bt-header__inner { min-height: var(--bt-header); display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.bt-brand { flex: 0 0 auto; min-width: 0; }
.bt-brand__link { display: inline-flex; align-items: center; gap: 11px; color: var(--bt-navy); text-decoration: none; }
.bt-brand__mark { flex: 0 0 56px; width: 56px; height: 56px; object-fit: contain; }
.bt-brand__name { display: grid; gap: 4px; min-width: 0; line-height: 1; }
.bt-brand__name strong { font-size: .93rem; font-weight: 850; letter-spacing: .065em; text-transform: uppercase; white-space: nowrap; }
.bt-brand__name small { color: var(--bt-orange); font-size: .64rem; font-weight: 850; letter-spacing: .22em; text-transform: uppercase; }
.bt-nav { display: flex; align-items: center; gap: 28px; }
.bt-menu { display: flex; align-items: center; gap: 30px; padding: 0; margin: 0; list-style: none; }
.bt-menu a { position: relative; display: inline-block; padding: 30px 0 27px; font-size: .86rem; font-weight: 700; letter-spacing: .035em; text-decoration: none; }
.bt-menu a::after { content: ''; position: absolute; left: 0; right: 100%; bottom: 21px; height: 2px; background: var(--bt-gold); transition: right .2s ease; }
.bt-menu a:hover::after, .bt-menu a:focus-visible::after, .bt-menu .current-menu-item a::after { right: 0; }
.bt-nav__cta, .bt-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 52px; padding: 13px 18px; border: 1px solid transparent; font-size: .83rem; font-weight: 800; letter-spacing: .055em; text-transform: uppercase; text-decoration: none; transition: transform .2s ease, background .2s ease, color .2s ease, border .2s ease; }
.bt-nav__cta { min-height: 44px; padding: 9px 14px; color: var(--bt-navy); background: var(--bt-gold); }
.bt-nav__cta:hover, .bt-button:hover { transform: translateY(-2px); }
.bt-nav-toggle { display: none; padding: 10px 0; border: 0; color: inherit; background: transparent; }
.bt-nav-toggle__label { font-size: .8rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.bt-nav-toggle__icon { display: grid; gap: 6px; margin-left: 10px; }
.bt-nav-toggle__icon i { display: block; width: 24px; height: 2px; background: currentColor; transition: transform .2s ease; }

.bt-kicker { display: flex; align-items: center; gap: 12px; margin: 0 0 22px; color: var(--bt-blue); font-size: .75rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.bt-kicker span { display: inline-flex; align-items: center; justify-content: center; min-width: 31px; height: 31px; padding-inline: 6px; border: 1px solid currentColor; color: var(--bt-orange); font-size: .67rem; }
.bt-kicker--light { color: var(--bt-gold-light); }
.bt-kicker--light span { color: var(--bt-gold); }
.bt-hero { position: relative; min-height: 860px; color: var(--bt-navy); background: #f2f2f2; isolation: isolate; }
.bt-hero::before { content: ''; position: absolute; z-index: -1; inset: 0 42% 0 0; background: linear-gradient(90deg, #f2f2f2 0%, #f2f2f2 78%, rgba(242,242,242,.55) 100%); }
.bt-hero__image { position: absolute; z-index: -2; inset: 0 0 0 46%; background: linear-gradient(90deg, rgba(242,242,242,.62), rgba(242,242,242,0) 30%), url('../images/hueco-ascensor.jpg') center / cover no-repeat; filter: saturate(.72) contrast(1.03); }
.bt-hero__inner { min-height: 860px; display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(230px, .55fr); gap: 11%; align-items: center; padding-top: var(--bt-header); }
.bt-hero__copy { max-width: 770px; }
.bt-hero h1, .bt-page-hero h1, .bt-about-hero h1, .bt-contact h1 { margin: 0; font-family: Georgia, 'Times New Roman', serif; font-weight: 400; line-height: .98; letter-spacing: -.045em; text-wrap: balance; }
.bt-hero h1 { max-width: 790px; font-size: clamp(4rem, 7vw, 7.2rem); }
.bt-hero__lead { max-width: 630px; margin: 34px 0 0; color: #4d5968; font-size: 1.14rem; line-height: 1.75; }
.bt-hero__actions { display: flex; align-items: center; gap: 28px; margin-top: 42px; }
.bt-button--gold { color: var(--bt-navy); background: var(--bt-gold); }
.bt-button--gold:hover { background: var(--bt-gold-light); }
.bt-button--navy { color: var(--bt-white); background: var(--bt-navy); }
.bt-button--navy:hover { background: var(--bt-navy-2); }
.bt-text-link, .bt-arrow-link { display: inline-flex; align-items: center; gap: 14px; font-weight: 800; text-decoration: none; }
.bt-text-link { color: var(--bt-navy); }
.bt-text-link span, .bt-arrow-link span { color: var(--bt-gold); transition: transform .2s ease; }
.bt-text-link:hover span { transform: translateY(4px); }
.bt-arrow-link:hover span { transform: translateX(4px); }
.bt-hero__panel { align-self: end; margin-bottom: 88px; }
.bt-hero .bt-kicker--light { color: var(--bt-blue); }
.bt-hero .bt-kicker--light span { color: var(--bt-orange); }
.bt-hero__indicator { width: 220px; padding: 22px; border: 1px solid rgba(7,25,66,.14); color: var(--bt-navy); background: rgba(255,255,255,.9); backdrop-filter: blur(8px); box-shadow: var(--bt-shadow); }
.bt-hero__indicator > span { color: var(--bt-orange); font-size: 1.3rem; }
.bt-hero__indicator strong { display: block; margin: 18px 0 3px; color: var(--bt-gold); font-family: Georgia, 'Times New Roman', serif; font-size: 4.4rem; font-weight: 400; line-height: 1; }
.bt-hero__indicator small { display: block; color: var(--bt-muted); font-size: .78rem; line-height: 1.45; text-transform: uppercase; letter-spacing: .08em; }
.bt-hero__panel > p { width: 220px; margin: 10px 0 0; padding: 13px 16px; color: rgba(255,255,255,.7); background: var(--bt-orange); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; }
.bt-hero__panel > p strong { color: var(--bt-white); }
.bt-hero__rail { position: absolute; right: 4%; top: 18%; width: 3px; height: 64%; background: linear-gradient(var(--bt-gold), rgba(198,162,96,.08)); box-shadow: 15px 0 rgba(255,255,255,.12); }

.bt-intro { padding: 130px 0 120px; background: var(--bt-white); }
.bt-intro__grid, .bt-section-heading--split, .bt-certification__grid, .bt-cta__inner { display: grid; grid-template-columns: 1.35fr .65fr; gap: 9%; align-items: end; }
.bt-intro h2, .bt-section-heading h2, .bt-field h2, .bt-story h2, .bt-cta h2, .bt-certification h2 { margin: 0; font-family: Georgia, 'Times New Roman', serif; font-size: clamp(2.8rem, 5vw, 5.2rem); font-weight: 400; line-height: 1.06; letter-spacing: -.04em; text-wrap: balance; }
.bt-intro__copy > p, .bt-section-heading--split > p { margin: 0 0 24px; color: var(--bt-muted); font-size: 1.05rem; }
.bt-arrow-link { color: var(--bt-navy); font-size: .9rem; }
.bt-proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 90px; border-top: 1px solid #cfd3d8; border-bottom: 1px solid #cfd3d8; }
.bt-proof-grid article { position: relative; min-height: 220px; padding: 36px 38px; border-right: 1px solid #cfd3d8; }
.bt-proof-grid article:last-child { border-right: 0; }
.bt-proof-grid span, .bt-process__steps > li > span, .bt-contact-notes article > span { color: var(--bt-orange); font-size: .72rem; font-weight: 800; letter-spacing: .12em; }
.bt-proof-grid h3 { margin: 50px 0 6px; font-size: 1.25rem; }
.bt-proof-grid p { margin: 0; color: var(--bt-muted); }

.bt-services { padding: 110px 0; background: #f2f2f2; }
.bt-elevator-scroll, .bt-elevator-sticky { position: relative; }
.bt-services-stage { position: relative; }
.bt-section-heading { max-width: 900px; margin-bottom: 76px; }
.bt-section-heading--split { max-width: none; }
.bt-section-heading--split > p { align-self: end; }
.bt-elevator-layout { display: grid; grid-template-columns: 330px minmax(0, 1fr); gap: 8%; align-items: center; }
.bt-elevator { position: relative; display: grid; grid-template-columns: 1fr 72px; gap: 16px; padding: 20px; color: var(--bt-white); background: #0a1220; box-shadow: var(--bt-shadow); }
.bt-elevator__display { grid-column: 1 / -1; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; padding: 15px 18px; border: 1px solid #313947; color: #ff4d28; background: #05080c; font-family: 'Courier New', monospace; }
.bt-elevator__arrow { font-size: 1.4rem; animation: bt-blink 1.4s steps(1) infinite; }
.bt-elevator__number { font-size: 2.4rem; font-weight: 700; line-height: 1; }
.bt-elevator__status { color: #7dffab; font-size: .62rem; letter-spacing: .1em; }
.bt-elevator__shaft { position: relative; height: 490px; overflow: hidden; border: 1px solid #3a424e; background: repeating-linear-gradient(to bottom, #111a27 0 61px, #202a38 62px 64px); }
.bt-elevator__rail { position: absolute; top: 0; bottom: 0; width: 3px; background: #697482; box-shadow: 5px 0 #242e3b; }
.bt-elevator__rail--left { left: 26%; }
.bt-elevator__rail--right { right: 26%; }
.bt-elevator__car { position: absolute; left: 18%; right: 18%; top: 14px; height: 120px; display: flex; overflow: hidden; border: 4px solid #aab2ba; background: #d9dde0; box-shadow: 0 6px 14px rgba(0,0,0,.4); transition: top .18s linear; }
.bt-elevator__car span { width: 50%; border: 1px solid #8d959d; background: linear-gradient(90deg, #e8ebed, #aeb5bb); transition: transform .4s ease; }
.bt-service-card.is-active ~ * .bt-elevator__car span { transform: none; }
.bt-elevator__buttons { display: grid; align-content: start; gap: 8px; }
.bt-floor-button { width: 48px; height: 48px; padding: 0; border: 1px solid #5b6572; border-radius: 50%; color: #e4e8ec; background: #1a2532; font-family: 'Courier New', monospace; font-size: .75rem; cursor: pointer; transition: color .2s ease, border .2s ease, box-shadow .2s ease; }
.bt-floor-button:hover, .bt-floor-button:focus-visible, .bt-floor-button.is-active { color: var(--bt-white); border-color: var(--bt-gold); box-shadow: inset 0 0 0 3px #1a2532, 0 0 0 2px var(--bt-gold); background: var(--bt-orange); }
.bt-service-list { min-width: 0; }
.bt-service-card { position: relative; display: grid; grid-template-columns: 110px minmax(0, 1fr); align-items: center; min-height: 420px; padding: 54px 0; border-top: 1px solid var(--bt-steel); opacity: 1; transition: opacity .38s ease, transform .38s ease, visibility .38s; }
.bt-service-card:last-child { border-bottom: 1px solid var(--bt-steel); }
.bt-service-card.is-active { opacity: 1; transform: none; }
.bt-service-card__floor { align-self: start; padding-top: 8px; color: var(--bt-orange); font-family: 'Courier New', monospace; font-size: .9rem; font-weight: 700; }
.bt-service-card__eyebrow { margin: 0 0 12px; color: var(--bt-blue) !important; font-size: .72rem !important; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.bt-service-card h3 { max-width: 700px; margin: 0 0 25px; color: var(--bt-navy); font-family: Georgia, 'Times New Roman', serif; font-size: clamp(2.5rem, 4.2vw, 4.6rem); font-weight: 400; line-height: 1.04; letter-spacing: -.035em; text-wrap: balance; }
.bt-service-card__content > p { max-width: 680px; margin: 0 0 30px; color: var(--bt-muted); font-size: 1.03rem; }
.bt-service-card ul { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; list-style: none; }
.bt-service-card li { padding: 8px 12px; border: 1px solid var(--bt-steel); color: var(--bt-navy); font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .045em; }
.bt-services-progress { display: flex; align-items: center; gap: 7px; width: calc(100% - 370px); margin: 20px 0 0 auto; color: var(--bt-navy); font: 700 .72rem/1 'Courier New', monospace; letter-spacing: .08em; }
.bt-services-progress i { position: relative; flex: 1; height: 2px; margin-left: 10px; overflow: hidden; background: #ccd2d8; }
.bt-services-progress b { position: absolute; inset: 0; background: var(--bt-orange); transform: scaleX(0); transform-origin: left center; transition: transform .12s linear; }

.bt-field { display: grid; grid-template-columns: 1fr 1fr; min-height: 780px; color: var(--bt-navy); background: var(--bt-white); }
.bt-field__photo { overflow: hidden; }
.bt-field__photo img { width: 100%; height: 100%; object-fit: cover; }
.bt-field__copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(56px, 8vw, 130px); }
.bt-field .bt-kicker--light { color: var(--bt-blue); }
.bt-field .bt-kicker--light span { color: var(--bt-orange); }
.bt-field__copy p { max-width: 650px; margin: 30px 0; color: var(--bt-muted); }
.bt-brand-list { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0 28px; }
.bt-brand-list span { padding: 9px 13px; border: 1px solid #cfd5dc; color: var(--bt-navy); background: #f2f2f2; font-size: .82rem; font-weight: 800; }
.bt-field__copy small { max-width: 620px; color: #7a8490; font-size: .72rem; line-height: 1.5; }

.bt-story { padding: 130px 0; background: #f2f2f2; }
.bt-story__grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 10%; align-items: center; }
.bt-story__photo { position: relative; max-width: 500px; }
.bt-story__photo::before { content: ''; position: absolute; z-index: 1; inset: 24px -24px -24px 24px; border: 1px solid var(--bt-gold); pointer-events: none; }
.bt-story__photo img { position: relative; z-index: 2; width: 100%; max-height: 630px; object-fit: cover; }
.bt-story__badge { position: absolute; z-index: 3; right: -44px; bottom: 46px; width: 160px; padding: 20px; color: var(--bt-white); background: var(--bt-orange); box-shadow: var(--bt-shadow); }
.bt-story__badge strong { display: block; font-family: Georgia, 'Times New Roman', serif; font-size: 2rem; font-weight: 400; }
.bt-story__badge span { display: block; margin-top: 5px; font-size: .68rem; line-height: 1.35; text-transform: uppercase; letter-spacing: .06em; }
.bt-story__copy p:not(.bt-kicker) { max-width: 650px; margin: 28px 0; color: var(--bt-muted); }
.bt-story__copy .bt-button { margin-top: 12px; }

.bt-cta { padding: 110px 0; color: var(--bt-navy); background: var(--bt-gold-light); border-block: 1px solid rgba(7,25,66,.1); }
.bt-cta .bt-kicker--light { color: var(--bt-blue); }
.bt-cta .bt-kicker--light span { color: var(--bt-orange); }
.bt-cta h2 { max-width: 750px; }
.bt-cta__inner > div:last-child p { margin: 0 0 30px; color: #4d5968; }

.bt-footer { padding: 82px 0 24px; color: rgba(255,255,255,.76); background: #040f29; }
.bt-footer__grid { display: grid; grid-template-columns: 1.5fr .6fr 1fr; gap: 8%; padding-bottom: 62px; }
.bt-footer__brand .bt-brand__link { margin-bottom: 22px; color: var(--bt-white); }
.bt-footer__brand .bt-brand__mark { width: 56px; height: 56px; }
.bt-footer__brand .bt-brand__name small { color: var(--bt-gold-light); }
.bt-footer__brand p { max-width: 330px; margin: 0; color: var(--bt-gold-light); font-family: Georgia, 'Times New Roman', serif; font-size: 1.35rem; line-height: 1.35; }
.bt-footer__label { margin: 0 0 18px; color: var(--bt-white); font-size: .72rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.bt-footer__links { padding: 0; margin: 0; list-style: none; }
.bt-footer__links li + li { margin-top: 10px; }
.bt-footer__links a { text-decoration: none; }
.bt-footer__links a:hover { color: var(--bt-gold); }
.bt-footer__bottom { display: flex; justify-content: space-between; gap: 30px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.13); color: rgba(255,255,255,.42); font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; }
.bt-footer__bottom p { margin: 0; }

.bt-page-hero { position: relative; padding: 210px 0 115px; color: var(--bt-navy); background: #f2f2f2; }
.bt-page-hero .bt-kicker--light { color: var(--bt-blue); }
.bt-page-hero .bt-kicker--light span { color: var(--bt-orange); }
.bt-page-hero::after { content: ''; position: absolute; right: 4%; top: 0; width: 22%; height: 100%; border-inline: 1px solid rgba(7,25,66,.07); background: repeating-linear-gradient(to bottom, transparent 0 89px, rgba(7,25,66,.07) 90px 91px); }
.bt-page-hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.45fr .55fr; gap: 9%; align-items: end; }
.bt-page-hero h1 { max-width: 880px; font-size: clamp(4rem, 7vw, 7rem); }
.bt-page-hero__inner > p { margin: 0; color: var(--bt-muted); }
.bt-page-hero + .bt-services { padding-top: 110px; }
.bt-process { padding: 120px 0; background: var(--bt-paper); }
.bt-process__steps { display: grid; grid-template-columns: repeat(4, 1fr); padding: 0; margin: 72px 0 0; border-top: 1px solid #cfd3d8; list-style: none; }
.bt-process__steps li { position: relative; padding: 35px 28px 20px 0; }
.bt-process__steps li::before { content: ''; position: absolute; top: -7px; left: 0; width: 13px; height: 13px; border: 3px solid var(--bt-paper); border-radius: 50%; background: var(--bt-orange); box-shadow: 0 0 0 3px var(--bt-paper); }
.bt-process__steps h3 { margin: 36px 0 10px; font-size: 1.1rem; }
.bt-process__steps p { margin: 0; color: var(--bt-muted); }

.bt-about-hero { display: grid; grid-template-columns: 46% 54%; min-height: 820px; color: var(--bt-navy); background: #f2f2f2; }
.bt-about-hero .bt-kicker--light { color: var(--bt-blue); }
.bt-about-hero .bt-kicker--light span { color: var(--bt-orange); }
.bt-about-hero__image { min-height: 680px; overflow: hidden; }
.bt-about-hero__image img { width: 100%; height: 100%; object-fit: cover; object-position: center 46%; filter: saturate(.85); }
.bt-about-hero__copy { display: flex; flex-direction: column; justify-content: center; padding: 150px clamp(42px, 7vw, 115px) 100px; }
.bt-about-hero h1 { max-width: 760px; font-size: clamp(4rem, 6.6vw, 6.7rem); }
.bt-about-hero__copy > p:last-child { max-width: 630px; margin: 32px 0 0; color: var(--bt-muted); }
.bt-timeline { padding: 120px 0; background: var(--bt-paper); }
.bt-timeline__line { display: grid; grid-template-columns: repeat(3, 1fr); padding: 0; margin: 78px 0 0; border-top: 1px solid #c9cdd2; list-style: none; }
.bt-timeline__line li { position: relative; padding: 40px 44px 0 0; }
.bt-timeline__line li::before { content: ''; position: absolute; top: -8px; left: 0; width: 14px; height: 14px; border-radius: 50%; background: var(--bt-orange); box-shadow: 0 0 0 5px var(--bt-paper); }
.bt-timeline__line strong { display: block; margin-bottom: 12px; color: var(--bt-navy); font-family: Georgia, 'Times New Roman', serif; font-size: 3.8rem; font-weight: 400; line-height: 1; }
.bt-timeline__line span { display: block; max-width: 260px; color: var(--bt-muted); }
.bt-purpose { padding: 120px 0; color: var(--bt-navy); background: var(--bt-white); }
.bt-purpose .bt-kicker--light { color: var(--bt-blue); }
.bt-purpose .bt-kicker--light span { color: var(--bt-orange); }
.bt-purpose__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.bt-purpose__grid article { min-height: 330px; padding: 46px; border: 1px solid #d6dbe0; background: #f2f2f2; }
.bt-purpose__number { display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; border: 1px solid var(--bt-gold); color: var(--bt-gold); font-family: Georgia, serif; }
.bt-purpose__grid h3 { margin: 62px 0 14px; color: var(--bt-navy); font-family: Georgia, serif; font-size: 2.1rem; font-weight: 400; }
.bt-purpose__grid p { max-width: 580px; margin: 0; color: var(--bt-muted); }
.bt-certification { padding: 110px 0; background: var(--bt-gold-light); }
.bt-certification__grid > div:last-child p { margin: 0 0 28px; color: #555849; }

.bt-contact { padding: 190px 0 115px; color: var(--bt-navy); background: #f2f2f2; }
.bt-contact .bt-kicker--light { color: var(--bt-blue); }
.bt-contact .bt-kicker--light span { color: var(--bt-orange); }
.bt-contact__grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 8%; align-items: start; }
.bt-contact h1 { max-width: 650px; font-size: clamp(3.8rem, 6vw, 6.3rem); }
.bt-contact__intro > p:not(.bt-kicker) { max-width: 600px; margin: 30px 0 44px; color: var(--bt-muted); }
.bt-contact__channels { border-top: 1px solid rgba(7,25,66,.16); }
.bt-contact__channels a { display: grid; grid-template-columns: 105px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid rgba(7,25,66,.16); text-decoration: none; }
.bt-contact__channels span { color: var(--bt-gold); font-size: .71rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.bt-contact__channels strong { font-weight: 500; overflow-wrap: anywhere; }
.bt-form-panel { padding: clamp(28px, 4vw, 54px); color: var(--bt-ink); background: var(--bt-white); box-shadow: var(--bt-shadow); }
.bt-form-placeholder__notice { display: grid; gap: 2px; margin-bottom: 28px; padding: 15px 18px; border-left: 3px solid var(--bt-orange); color: var(--bt-navy); background: var(--bt-paper); }
.bt-form-placeholder__notice span { color: var(--bt-muted); font-size: .78rem; }
.bt-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.bt-form-placeholder label { display: grid; gap: 7px; margin-bottom: 16px; color: var(--bt-navy); font-size: .78rem; font-weight: 800; letter-spacing: .025em; }
.bt-form-placeholder input, .bt-form-placeholder select, .bt-form-placeholder textarea { width: 100%; min-height: 47px; padding: 10px 12px; border: 1px solid #cfd4da; border-radius: 0; color: #777; background: #fbfbfa; opacity: 1; }
.bt-form-placeholder textarea { min-height: 110px; resize: none; }
.bt-form-placeholder button { width: 100%; min-height: 52px; border: 0; color: rgba(255,255,255,.7); background: #768090; font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; opacity: 1; cursor: not-allowed; }
.bt-form-live input, .bt-form-live select, .bt-form-live textarea { max-width: 100%; }
.bt-contact-notes { padding: 90px 0; background: var(--bt-paper); }
.bt-contact-notes__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: #ccd1d6; }
.bt-contact-notes article { padding: 46px; background: var(--bt-paper); }
.bt-contact-notes h2 { margin: 30px 0 10px; font-family: Georgia, serif; font-size: 2rem; font-weight: 400; }
.bt-contact-notes p { margin: 0; color: var(--bt-muted); }

.bt-standard-page { min-height: 70vh; padding: 170px 0 100px; background: var(--bt-paper); }
.bt-prose { max-width: 850px; }
.bt-prose h1 { margin: 0 0 40px; color: var(--bt-navy); font-family: Georgia, serif; font-size: clamp(3rem, 6vw, 5.5rem); font-weight: 400; line-height: 1.05; }
.bt-prose .entry-content { font-size: 1.05rem; }
.bt-prose .entry-content > * { max-width: 760px; }

.bt-js [data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity .65s ease, transform .65s ease; }
.bt-js [data-reveal].is-visible { opacity: 1; transform: none; }
@keyframes bt-blink { 0%, 74% { opacity: 1; } 75%, 100% { opacity: .28; } }

@media (min-width: 921px) {
  .bt-js .bt-services { padding: 0; }
  .bt-js .bt-elevator-scroll { height: 500vh; }
  .bt-js .bt-elevator-sticky { position: sticky; top: 0; height: 100vh; min-height: 690px; display: flex; align-items: center; overflow: hidden; padding: 24px 0; }
  .bt-js .bt-services-stage { display: flex; flex-direction: column; justify-content: center; height: 100%; }
  .bt-js .bt-services-stage > .bt-section-heading { margin-bottom: 24px; }
  .bt-js .bt-services-stage > .bt-section-heading h2 { font-size: clamp(2.5rem, 4vw, 4.15rem); }
  .bt-js .bt-services-stage > .bt-section-heading > p { max-width: 420px; font-size: .94rem; }
  .bt-js .bt-services-stage .bt-kicker { margin-bottom: 12px; }
  .bt-js .bt-elevator__shaft { height: min(42vh, 390px); min-height: 320px; }
  .bt-js .bt-service-list { position: relative; height: min(46vh, 430px); min-height: 350px; overflow: hidden; }
  .bt-js .bt-service-card { position: absolute; inset: 0; min-height: 0; padding: 38px 0; opacity: 1; visibility: hidden; transform: none; background: #f2f2f2; pointer-events: none; transition: visibility .01ms linear .34s; }
  .bt-js .bt-service-card__floor,
  .bt-js .bt-service-card__content { opacity: 0; transform: translateY(16px); transition: opacity .28s ease, transform .34s ease; }
  .bt-js .bt-service-card.is-active { z-index: 1; visibility: visible; pointer-events: auto; transition-delay: 0s; }
  .bt-js .bt-service-card.is-active .bt-service-card__floor,
  .bt-js .bt-service-card.is-active .bt-service-card__content { opacity: 1; transform: none; transition-delay: .06s; }
}

@media (max-width: 1040px) {
  :root { --bt-header: 76px; }
  .bt-nav-toggle { display: inline-flex; align-items: center; cursor: pointer; }
  .bt-nav { position: fixed; inset: var(--bt-header) 0 0; display: grid; align-content: start; gap: 30px; padding: 42px 24px; color: var(--bt-white); background: var(--bt-navy); transform: translateX(100%); visibility: hidden; transition: transform .28s ease, visibility .28s; }
  .bt-nav.is-open { transform: none; visibility: visible; }
  .bt-menu { display: grid; gap: 0; }
  .bt-menu a { width: 100%; padding: 17px 0; border-bottom: 1px solid rgba(255,255,255,.14); font-family: Georgia, serif; font-size: 1.8rem; font-weight: 400; letter-spacing: -.02em; }
  .bt-menu a::after { display: none; }
  .bt-nav__cta { justify-self: start; }
  .bt-nav-toggle[aria-expanded='true'] .bt-nav-toggle__icon i:first-child { transform: translateY(4px) rotate(45deg); }
  .bt-nav-toggle[aria-expanded='true'] .bt-nav-toggle__icon i:last-child { transform: translateY(-4px) rotate(-45deg); }
  .bt-hero__inner { grid-template-columns: 1fr .34fr; gap: 5%; }
  .bt-hero h1 { font-size: clamp(3.7rem, 8vw, 6rem); }
  .bt-elevator-layout { grid-template-columns: 280px minmax(0,1fr); gap: 5%; }
  .bt-elevator__shaft { height: 420px; }
  .bt-field__copy { padding: 70px 48px; }
  .bt-story__grid { gap: 7%; }
  .bt-page-hero__inner, .bt-intro__grid, .bt-section-heading--split, .bt-certification__grid, .bt-cta__inner { gap: 5%; }
}

@media (max-width: 920px) {
  .bt-services { padding: 82px 0; }
  .bt-elevator-scroll, .bt-elevator-sticky { height: auto; min-height: 0; overflow: visible; }
  .bt-elevator-layout { display: block; }
  .bt-elevator { position: relative; top: auto; display: flex; align-items: center; gap: 12px; overflow-x: auto; padding: 12px; margin-bottom: 28px; box-shadow: none; }
  .bt-elevator__display { position: sticky; left: 0; z-index: 2; flex: 0 0 105px; display: grid; grid-template-columns: auto 1fr; gap: 6px; padding: 9px; }
  .bt-elevator__number { font-size: 1.6rem; }
  .bt-elevator__status { grid-column: 1 / -1; font-size: .55rem; }
  .bt-elevator__shaft { display: none; }
  .bt-elevator__buttons { display: flex; gap: 8px; }
  .bt-floor-button { flex: 0 0 42px; width: 42px; height: 42px; }
  .bt-service-list { height: auto; overflow: visible; }
  .bt-service-card, .bt-js .bt-service-card { position: relative; inset: auto; grid-template-columns: 70px minmax(0,1fr); min-height: auto; padding: 46px 0; opacity: 1; visibility: visible; transform: none !important; pointer-events: auto; }
  .bt-service-card h3 { font-size: clamp(2.1rem, 7.5vw, 3.4rem); }
  .bt-services-progress { display: none; }
}

@media (max-width: 800px) {
  .bt-shell { width: min(calc(100% - 32px), var(--bt-shell)); }
  .bt-brand__link { gap: 9px; }
  .bt-brand__mark { flex-basis: 46px; width: 46px; height: 46px; }
  .bt-brand__name strong { font-size: .76rem; letter-spacing: .045em; }
  .bt-brand__name small { font-size: .58rem; }
  .bt-hero { min-height: 780px; }
  .bt-hero::before { inset: 0; background: linear-gradient(180deg, rgba(7,25,66,.96) 0%, rgba(7,25,66,.8) 65%, rgba(7,25,66,.94) 100%); }
  .bt-hero__image { inset: 0; opacity: .55; }
  .bt-hero__inner { min-height: 780px; grid-template-columns: 1fr; align-content: center; gap: 45px; padding-top: 115px; }
  .bt-hero h1 { font-size: clamp(3.3rem, 13vw, 5.4rem); }
  .bt-hero__lead { font-size: 1rem; }
  .bt-hero__panel { align-self: auto; margin: 0; }
  .bt-hero__indicator { display: grid; grid-template-columns: auto auto 1fr; align-items: center; gap: 14px; width: 100%; padding: 13px 16px; }
  .bt-hero__indicator strong { margin: 0; font-size: 2.6rem; }
  .bt-hero__panel > p { width: 100%; }
  .bt-hero__rail { display: none; }
  .bt-intro, .bt-services, .bt-story, .bt-timeline, .bt-purpose, .bt-certification, .bt-process { padding: 82px 0; }
  .bt-intro__grid, .bt-section-heading--split, .bt-certification__grid, .bt-cta__inner, .bt-page-hero__inner { grid-template-columns: 1fr; gap: 30px; }
  .bt-intro h2, .bt-section-heading h2, .bt-field h2, .bt-story h2, .bt-cta h2, .bt-certification h2 { font-size: clamp(2.5rem, 10vw, 4.1rem); }
  .bt-proof-grid { grid-template-columns: 1fr; margin-top: 54px; }
  .bt-proof-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid #cfd3d8; }
  .bt-proof-grid article:last-child { border-bottom: 0; }
  .bt-proof-grid h3 { margin-top: 26px; }
  .bt-section-heading { margin-bottom: 48px; }
  .bt-service-card, .bt-js .bt-service-card { grid-template-columns: 54px minmax(0,1fr); }
  .bt-service-card h3 { font-size: clamp(2.1rem, 9vw, 3.4rem); }
  .bt-field { grid-template-columns: 1fr; }
  .bt-field__photo { height: 520px; }
  .bt-field__copy { padding: 76px 24px; }
  .bt-story__grid { grid-template-columns: 1fr; gap: 80px; }
  .bt-story__photo { max-width: calc(100% - 24px); }
  .bt-story__badge { right: -18px; }
  .bt-cta { padding: 82px 0; }
  .bt-footer__grid { grid-template-columns: 1fr 1fr; }
  .bt-footer__brand { grid-column: 1 / -1; }
  .bt-footer__bottom { display: grid; }
  .bt-page-hero { padding: 160px 0 82px; }
  .bt-page-hero h1 { font-size: clamp(3.3rem, 12vw, 5.4rem); }
  .bt-process__steps, .bt-timeline__line { grid-template-columns: 1fr; border-top: 0; border-left: 1px solid #cfd3d8; }
  .bt-process__steps li, .bt-timeline__line li { padding: 0 0 48px 36px; }
  .bt-process__steps li::before, .bt-timeline__line li::before { top: 8px; left: -7px; }
  .bt-process__steps h3 { margin-top: 20px; }
  .bt-about-hero { grid-template-columns: 1fr; }
  .bt-about-hero__image { min-height: 510px; }
  .bt-about-hero__copy { padding: 70px 24px 82px; }
  .bt-about-hero h1 { font-size: clamp(3.2rem, 12vw, 5rem); }
  .bt-purpose__grid { grid-template-columns: 1fr; }
  .bt-contact { padding: 145px 0 82px; }
  .bt-contact__grid { grid-template-columns: 1fr; gap: 60px; }
  .bt-contact h1 { font-size: clamp(3.2rem, 12vw, 5rem); }
}

@media (max-width: 520px) {
  .bt-hero__actions { align-items: flex-start; flex-direction: column; }
  .bt-service-card { grid-template-columns: 1fr; }
  .bt-service-card__floor { margin-bottom: 18px; }
  .bt-story__photo::before { inset: 14px -14px -14px 14px; }
  .bt-footer__grid { grid-template-columns: 1fr; }
  .bt-footer__brand { grid-column: auto; }
  .bt-purpose__grid article, .bt-contact-notes article { padding: 32px 24px; }
  .bt-contact-notes__grid, .bt-form-row { grid-template-columns: 1fr; }
  .bt-contact__channels a { grid-template-columns: 1fr; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
  .bt-js [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .bt-header, .bt-footer, .bt-elevator, .bt-cta { display: none; }
  .bt-hero, .bt-page-hero, .bt-about-hero, .bt-contact, .bt-purpose, .bt-field { color: #000; background: #fff; }
  .bt-hero { min-height: auto; padding: 40px 0; }
  .bt-service-card { min-height: auto; opacity: 1; }
}