/* Filter Math / blue studio. Open technical sheets, cobalt type, square geometry. */
@media(max-width:740px){.hero h1 em{display:inline-block;white-space:nowrap;font-size:.82em}}
:root{--paper:#e8f3ff;--ink:#133653;--muted:#466780;--line:#b8d5ef;--sky:#a8d8ff;--white:#fff;--sans:Arial,"Helvetica Neue",sans-serif}
body{background:var(--paper)}.shell{width:min(1360px,calc(100% - 88px))}h1,h2,h3{letter-spacing:-.045em}h2{font-weight:750;line-height:1.01}em{color:#1760c5}.site .nav{height:90px;border-bottom:2px solid #183e65}.brand{font-size:25px;letter-spacing:-1.5px}.brand-icon{font-size:35px;color:#1c70d6}.navlinks{font-size:12px;text-transform:uppercase;letter-spacing:.06em}.nav-lab,.menu{border-radius:0;border-color:#184976;text-transform:uppercase;font:10px var(--mono);padding:12px 16px}.nav-lab:hover{background:#1760c5}.eyebrow,.kicker{font-weight:500;letter-spacing:.11em;color:#3e6b95}.signal-dot{background:#2278d8;border-radius:0;transform:rotate(45deg)}
.hero{display:block;padding:54px 0 0}.hero-copy{text-align:center;max-width:1180px;margin:0 auto}.hero .eyebrow{font-size:10px;margin-bottom:25px}.hero h1{font-family:"Arial Black",Arial,sans-serif;font-size:clamp(68px,9.8vw,142px);font-weight:900;line-height:.86;letter-spacing:-.075em;margin:26px 0 28px}.hero h1 em{color:transparent;-webkit-text-stroke:1.6px #1760c5;font-weight:900}.hero-deck{font-size:18px;letter-spacing:-.02em;margin:0 auto 10px;max-width:620px}.hero-description{max-width:540px;margin:0 auto;font-size:13px;line-height:1.65}.hero-actions{justify-content:center;margin:25px 0 18px;gap:28px}.button{border-radius:0;padding:14px 22px;font-size:11px;text-transform:uppercase;letter-spacing:.04em;gap:30px}.button.dark{background:#1760c5;color:#fff}.button.light{background:#1760c5;color:white}.button:hover{transform:none;box-shadow:4px 4px 0 #a9cbea}.hero-footnote{font-size:9px}.hero-footnote span{font-size:11px}.text-link{font-size:12px;border-color:#1760c5}.air-object{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);grid-template-rows:auto auto 1fr auto;border:0;border-top:2px solid #174a7b;border-bottom:1px solid #8fb8dd;border-radius:0;box-shadow:none;margin:40px 0 0;background:#f5faff;position:relative;overflow:hidden}.diagram-top{grid-column:1/-1;padding:16px 22px 0;font-size:9px;color:#466d97}.diagram-top i{border-radius:0;background:#2278d8}.air-object svg{grid-column:1;grid-row:2/5;width:100%;max-height:395px;align-self:center;margin:0;border-right:1px solid #cee2f5}.diagram-controls{grid-column:2;grid-row:2;flex-direction:column;border:0;border-radius:0;margin:25px 28px 0;gap:7px}.diagram-controls button{border:0;border-bottom:1px solid #b8d5ef;padding:13px 12px;text-align:left;font:11px var(--mono);color:#255988}.diagram-controls button[aria-pressed=true]{background:#2375cf;color:#fff;box-shadow:4px 4px 0 #c2e0fb}.diagram-caption{grid-column:2;grid-row:3;margin:22px 29px 16px;font-size:13px;line-height:1.65;max-width:300px;min-height:0}.diagram-note{grid-column:2;grid-row:4;margin:0 28px 24px;flex-direction:column;align-items:start;gap:8px;font-size:8px;line-height:1.5}.motion-toggle{color:#205da1;font-size:9px;border-color:#8fb8dd}.air-object[data-mode=measure] .sensor-layer{filter:drop-shadow(0 0 10px #80c7ff)}
.principles{border-top:0;padding:24px 0;gap:16px}.principles>div{padding-inline:24px}.principles>div>span{font-size:26px;color:#3475bd;line-height:1;margin-top:2px}.principles p{font-size:12px;letter-spacing:.01em}.principles small{font-size:10px}.section-pad{padding-top:75px}.section-heading{align-items:end}.section-heading h2{font-size:clamp(34px,3.6vw,53px);letter-spacing:-.05em}.section-heading .eyebrow{font-size:9px}.section-heading p:not(.eyebrow){font-size:12px}.product-tabs{gap:0;border-top:1px solid var(--line);border-bottom:0}.product-tabs button{padding:13px 22px;font:10px var(--mono);border:1px solid transparent;text-transform:uppercase}.product-tabs button[aria-pressed=true]{background:#fff;border-color:#83b3df;color:#1760c5}.product-panel{grid-template-columns:1.1fr 1fr;border:0;border-top:2px solid #174a7b;border-bottom:1px solid #a8c9e8;border-radius:0;background:#f8fcff}.product-panel figure{border-color:var(--line);background:#fff}.product-panel figure img{height:365px}.product-copy h3{font-weight:750;font-size:39px}.bench-points{border-color:#bed7ed}.bench-points span{font:11px/1.6 var(--mono);border-color:#bed7ed}.product-copy .button{margin-top:7px}.cards{gap:0}.cards-index{grid-template-columns:repeat(3,minmax(0,1fr));border-top:2px solid #174a7b}.card{padding:26px 28px;border:0;border-right:1px solid #a9c9e7;border-bottom:1px solid #a9c9e7;background:transparent}.card:last-child{border-right:0}.card:hover{background:#fff}.card-label{font:9px var(--mono);color:#29659f}.card h3{font-weight:700;letter-spacing:-.035em;font-size:25px}.card p{font-size:12px;line-height:1.7}.card-bottom{color:#1760c5;font-size:9px}.method-banner{background:#d2e8ff;color:var(--ink);border-radius:0;border:0;border-top:2px solid #174a7b;border-bottom:1px solid #95bde1;padding:55px 65px;grid-template-columns:.75fr 1fr;margin-top:70px}.method-mark{color:#2375cf;font-weight:600;font-size:240px;transform:rotate(-10deg)}.method-banner h2{font-size:55px;font-weight:800}.method-banner .eyebrow{color:#356a9d}.method-banner p:not(.eyebrow){color:#3f678a;font-size:13px}.footer-top .brand{font-size:29px}.footer-top p{font-size:21px;font-weight:600}.footer-bottom{font-family:var(--mono);font-size:9px}.footer-bottom nav{gap:18px}footer.site{background:#daeafa;border-color:#98bcdf}
.section-index h1,.utility h1{font-weight:800;letter-spacing:-.06em}.search-tools input{border-radius:0;background:#fff;border-color:#8db8df}.filter-chips button{border-radius:0;font:10px var(--mono);padding:10px 13px;border-color:#a0c4e5}.filter-chips button[aria-pressed=true]{background:#1760c5;border-color:#1760c5;color:#fff}.section-index .cards-index{grid-template-columns:repeat(3,minmax(0,1fr))}.reader h1{font-weight:750;letter-spacing:-.055em}.reader .meta{font-size:10px}.research-note{background:#d7eaff;border-color:#448adb}.article-body h2,.article-body h3{font-weight:700}.article-body code{background:#d8eaff}.table-wrap{border-radius:0;border-color:#9abfe0}.table-wrap table{background:#f8fcff}th{background:#cee6fc}td,th{border-color:#bdd7ed}.image-gallery figure{border-radius:0;border-color:#a7cae9}.related .card{padding-inline:20px}.sources{border-color:#a9c9e7}blockquote{background:#d9ecff;border-color:#4d90d2}blockquote.verdict{background:#194c7d;color:#fff}
/* The calculator is a ruled instrument sheet rather than a rounded dashboard. */
#air-lab{background:#f5faff;border:0;border-top:2px solid #174a7b;border-bottom:1px solid #98bfdf;border-radius:0;padding:28px 0 0;--ice:#e8f3ff;--navy:#133653;--sky:#a8d8ff}#air-lab h2{font-size:31px;font-weight:700}.air-lab__intro{padding-inline:28px}.air-lab__main-grid{border-radius:0;border-inline:0;background:#fff;border-color:#a8c9e8;grid-template-columns:minmax(240px,.75fr) minmax(0,1.4fr)}.air-lab__controls{border-color:#a8c9e8;background:#e0efff}.air-lab__visual-wrap{background:#f5faff}.air-lab__room{border-radius:0;background:#d9edff;border-color:#9abfe0}.air-lab__window{border-radius:0}.air-lab__unit{box-shadow:5px 8px 0 #98bde280;border-radius:5px}.air-lab__dimension-frame{border-color:#467eaf;background:#82c8ff15}#air-lab button,#air-lab select,#air-lab input[type=number]{border-radius:0}#air-lab button{background:#1760c5;color:#fff;border:1px solid #1760c5;font:10px var(--mono);text-transform:uppercase}#air-lab button:hover{background:#133653;color:white}#air-lab input[type=range]{accent-color:#1e75d5}.air-lab__result strong{color:#1760c5;font-weight:750;font-size:85px;letter-spacing:-.07em}.air-lab__result span{color:#376b9b}.air-lab__formula{padding:17px 28px;border-color:#a7c8e6}.air-lab__cost{padding:32px 28px;grid-template-columns:1fr 1.25fr .9fr;gap:30px}.air-lab__cost-output{border-radius:0;background:#c5e3ff;border:1px solid #80b4e3;padding:20px;box-shadow:6px 6px 0 #e1f0ff}.air-lab__cost-output strong{font-weight:750;color:#1459a6}.air-lab__cost-form input{border-color:#a7c8e6!important;background:white!important}
@media(max-width:1000px){.shell{width:calc(100% - 52px)}.hero h1{font-size:clamp(68px,10vw,105px)}.navlinks{gap:18px;font-size:10px}.diagram-controls{margin-inline:22px}.diagram-caption{margin-inline:22px;font-size:12px}.diagram-note{margin-inline:22px}.air-object svg{max-height:370px}.principles>div{padding-inline:14px;gap:12px}.principles>div>span{font-size:22px}.principles small{font-size:9px}.card{padding:22px}.card h3{font-size:22px}.method-banner{padding:42px}.method-banner h2{font-size:43px}.air-lab__cost{grid-template-columns:1fr 1fr}.air-lab__cost>div:first-child{grid-column:1/-1}}
@media(max-width:740px){.shell{width:calc(100% - 36px)}.site .nav{height:75px}.menu{font-size:10px;padding:9px 14px}.hero{padding-top:39px}.hero .eyebrow{font-size:8px;letter-spacing:.09em}.hero h1{font-size:clamp(50px,12.8vw,93px);line-height:.91;letter-spacing:-.07em;margin:28px 0 25px}.hero h1 em{-webkit-text-stroke:1px #1760c5}.hero-deck{font-size:16px;max-width:350px;line-height:1.4}.hero-description{font-size:12px;max-width:350px}.hero-actions{gap:18px;margin-block:24px 18px}.hero-actions .button{font-size:10px;padding:13px 16px;gap:22px}.hero-actions .text-link{font-size:10px}.hero-footnote{font-size:9px;line-height:1.7}.hero-footnote span{font-size:10px}.air-object{display:block;margin-top:30px}.diagram-top{padding:16px 17px 0;font-size:8px}.air-object svg{max-height:none;border:0;margin:0;width:100%}.diagram-controls{flex-direction:row;gap:0;margin:0 15px;border-bottom:1px solid #a7c8e6}.diagram-controls button{text-align:center;font-size:9px;padding:10px 4px;border-bottom:0}.diagram-controls button[aria-pressed=true]{box-shadow:none}.diagram-caption{font-size:12px;margin:17px 18px;max-width:none;min-height:57px}.diagram-note{flex-direction:row;align-items:center;justify-content:space-between;margin:0 18px 19px;font-size:7px;gap:8px}.principles{padding:20px 0;grid-template-columns:1fr;gap:18px}.principles>div{padding:0;border:0;gap:17px}.principles>div>span{font-size:25px}.principles p{font-size:12px}.principles small{font-size:10px;display:block;margin-left:0}.section-pad{padding-top:54px}.section-heading h2{font-size:35px}.section-heading{align-items:start;gap:18px}.section-heading .eyebrow{font-size:8px;line-height:1.7}.product-tabs{gap:0;flex-wrap:nowrap}.product-tabs button{padding:10px 8px;font-size:9px;flex:1}.product-panel{grid-template-columns:1fr}.product-panel figure{padding:24px;border:0;border-bottom:1px solid var(--line)}.product-panel figure img{height:270px}.product-copy{padding:29px 24px}.product-copy h3{font-size:34px}.cards-index,.section-index .cards-index{grid-template-columns:1fr}.card{padding:25px 5px;border-right:0}.card h3{font-size:26px;margin-block:18px 14px}.card p{font-size:13px}.reading .cards-index>.card:last-child{display:flex}.method-banner{grid-template-columns:1fr;gap:25px;padding:32px 26px;margin:50px 0}.method-mark{font-size:100px;justify-self:start;margin:0}.method-banner h2{font-size:37px}.footer-top p{font-size:17px}.footer-bottom{font-size:9px}.reader h1{font-size:39px}.section-index h1{font-size:46px}.related .cards{grid-template-columns:1fr}.related .card{padding-inline:0}.section-index .excerpt{font-size:16px}.filter-chips button{padding:9px 10px;font-size:9px}#air-lab{padding-top:22px}.air-lab__intro{padding-inline:18px}#air-lab h2{font-size:27px}.air-lab__main-grid{grid-template-columns:1fr}.air-lab__visual-wrap{padding:23px 18px}.air-lab__result strong{font-size:69px}.air-lab__result span{font-size:8px}.air-lab__cost{grid-template-columns:1fr;padding:27px 18px;gap:25px}.air-lab__cost-form{grid-template-columns:1fr 1fr}.air-lab__cost-output{box-shadow:none}.air-lab__formula{padding-inline:18px}}
@media(max-width:370px){.hero h1{font-size:12.6vw}.hero-actions{gap:15px}.hero-actions .button{gap:14px;padding-inline:14px}.hero-actions .text-link{font-size:9px}.hero .eyebrow{font-size:7px}.diagram-controls button{font-size:8px}.diagram-note{flex-wrap:wrap}.section-heading h2{font-size:31px}.method-banner h2{font-size:33px}.air-lab__cost-form{grid-template-columns:1fr}.air-lab__result strong{font-size:61px}}