.er-hero{display:grid;grid-template-columns:1fr 1fr;background:#edf5fa;align-items:center;gap:30px;padding:55px var(--page-gutter);}
.er-hero h1{font:400 60px/1.06 Georgia,serif;letter-spacing:-.035em;margin:24px 0;}
.er-lede{max-width:460px;font-size:18px;line-height:1.65;color:#41647d;}
.er-hero-actions{display:flex;align-items:center;gap:28px;flex-wrap:wrap;margin-top:28px;}
.engineering-reference figure{margin:0;min-width:0;}
.engineering-reference figure img{display:block;width:100%;aspect-ratio:4/3;object-fit:contain;background:#eaf3f9;}
.engineering-reference figcaption{font:400 13px/1.5 Arial,sans-serif;padding:14px 0;color:#54758b;}
.er-subnav{position:static;inset:auto;display:flex;flex-wrap:wrap;gap:10px 30px;padding:16px var(--page-gutter);background:#fff;border-bottom:1px solid #d5e3ed;}
.er-subnav a{font:400 15px/1.5 Arial,sans-serif;display:flex;align-items:center;min-height:44px;}
.er-quantity-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:30px;}
.er-quantity-grid article{border-top:2px solid #9cbbcf;padding-top:25px;}
.er-symbol{font:400 40px/1.2 Georgia,serif;display:block;margin-bottom:20px;}
.er-symbol sub{font-size:21px;}
.er-quantity-grid h3{font:600 17px/1.4 Arial,sans-serif;letter-spacing:0;margin:0 0 14px;}
.er-quantity-grid p{font-size:16px;line-height:1.65;color:#44657c;}
.er-unit{display:block;font-size:14px;color:#1f5477;margin-top:20px;}
.er-inline-note{font-size:15px;color:#41647d;max-width:1000px;border-top:1px solid #d9e5ed;padding-top:24px;margin:28px 0 0;}
.er-tools-section{background:#edf5fa;}
.er-tools-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;align-items:stretch;}
.er-tool{min-width:0;padding:32px;background:#fff;border:1px solid #d9e6ef;}
.er-tool h3{font:400 29px/1.2 Georgia,serif;letter-spacing:-.015em;margin:14px 0 24px;}
.er-tool label{display:block;font:600 14px/1.5 Arial,sans-serif;color:#264e6b;margin-bottom:18px;}
.er-tool input,.er-tool select{display:block;width:100%;min-height:47px;border:1px solid #a7c2d3;border-radius:0;background:#fff;color:#123d5c;font:400 16px/1.5 Arial,sans-serif;padding:10px 12px;margin-top:7px;}
.er-tool input:focus-visible,.er-tool select:focus-visible{outline:2px solid #377fa8;outline-offset:3px;}
.er-input-pair{display:grid;grid-template-columns:1fr 1fr;gap:0 18px;}
.er-tool output{display:block;background:#eaf3f9;color:#0c3858;padding:22px;font:400 28px/1.3 Georgia,serif;overflow-wrap:anywhere;min-height:80px;margin:10px 0 20px;}
.er-formula{font:400 15px/1.7 Arial,sans-serif;color:#234e6b;overflow-wrap:anywhere;}
.er-tool-note,.er-example-note{font:400 14px/1.6 Arial,sans-serif;color:#547185;}
.er-example-note{margin:-10px 0 24px;}
.er-runout{margin-top:28px;border-top:1px solid #a9c4d5;border-bottom:1px solid #a9c4d5;}
.er-runout summary{font:400 23px/1.4 Georgia,serif;cursor:pointer;padding:23px 0;}
.er-runout>div{padding:0 0 28px;max-width:960px;}
.er-runout>div>p{font-size:16px;}
.er-runout-example{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;padding:22px;background:#fff;margin:20px 0;}
.er-runout-example span{font:400 14px/1.6 Arial,sans-serif;color:#527085;}
.er-runout-example strong{font:400 27px/1.7 Georgia,serif;color:#103b5a;}
.er-interface-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;}
.er-interface-grid>article{min-width:0;}
.er-interface-grid h3{font:400 31px/1.25 Georgia,serif;margin:15px 0 24px;}
.er-interface-grid dl{margin:0 0 22px;}
.er-interface-grid dl>div{display:grid;grid-template-columns:100px 1fr;gap:14px;border-top:1px solid #d2e2ec;padding:14px 0;font:400 15px/1.6 Arial,sans-serif;}
.er-interface-grid dt{font-weight:600;color:#234e6b;}
.er-interface-grid dd{margin:0;color:#507086;}
.er-specification{background:#0b3553;color:#fff;display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;}
.er-specification h2{margin-bottom:0;}
.er-specification p{color:#d0e2ee;font-size:17px;max-width:520px;}
.er-specification .site-button{margin-top:20px;background:#fff;color:#143e5b;border-color:#fff;}
.er-sources{background:#f8fbfd;}
.er-sources>p{max-width:850px;}
.er-sources ul{list-style:none;padding:0;margin:28px 0;display:grid;grid-template-columns:1fr 1fr;gap:18px 40px;}
.er-sources li{border-top:1px solid #d5e4ee;padding-top:15px;font:400 14px/1.6 Arial,sans-serif;}
.er-sources li a{display:block;color:#1d567b;text-decoration:underline;text-underline-offset:4px;}
.er-sources li span{display:block;color:#5b7688;margin-top:5px;}
.er-edition{font-size:13px;color:#547185;}
@media(max-width:1100px){.er-hero h1{font-size:48px;}.er-quantity-grid{grid-template-columns:1fr 1fr;}.er-tool{padding:25px;}.er-hero-actions{gap:18px;}}
@media(max-width:760px){.er-hero{grid-template-columns:1fr;padding:28px 20px 22px;gap:28px;}.er-hero h1{font-size:41px;}.er-lede{font-size:17px;}.er-subnav{padding:12px 20px;gap:0 20px;}.er-subnav a{font-size:14px;}.er-quantity-grid{gap:26px 20px;}.er-symbol{font-size:35px;}.er-quantity-grid h3{font-size:16px;}.er-quantity-grid p{font-size:15px;}.er-tools-grid,.er-interface-grid,.er-specification{grid-template-columns:1fr;gap:28px;}.er-tool{padding:24px 20px;}.er-tool h3{font-size:27px;}.er-tool output{font-size:25px;padding:18px;}.er-input-pair{gap:0 12px;}.er-runout summary{font-size:22px;}.er-runout-example{grid-template-columns:1fr;gap:15px;padding:20px;}.er-runout-example span{display:flex;justify-content:space-between;align-items:center;gap:15px;}.er-runout-example strong{font-size:25px;}.er-interface-grid h3{font-size:28px;}.er-interface-grid dl>div{grid-template-columns:90px 1fr;font-size:14px;}.er-sources ul{grid-template-columns:1fr;}.er-specification h2{font-size:30px;}}
@media(max-width:360px){.er-hero h1{font-size:36px;}.er-quantity-grid{grid-template-columns:1fr;}.er-input-pair{grid-template-columns:1fr;}.er-hero-actions .site-button{width:100%;}.er-tool output{font-size:22px;}}
.er-value-unit{display:inline-block;white-space:nowrap}
.er-value-unit.is-scientific{font-size:.78em}
@media(max-width:760px){.er-tools-grid{grid-template-columns:minmax(0,1fr)}}