/* Engineering reading room: graphite, steel blue, orange checks, measured layouts. */
:root{--check:#176653;--alert:#982f27}
[hidden]{display:none!important}
.engineering,.film-library{scroll-margin-top:100px}.engineering{background:#eef2f5}.engineering .section-head,.film-library .section-head{align-items:start}.engineering .section-head>div,.film-library .section-head>div{flex:1}.engineering .section-head p,.film-library .section-head p{flex:1;max-width:520px}
.engineering-toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:28px 0 16px}.engineering-toolbar label{font-weight:600}.engineering-toolbar input{flex:1;min-width:180px;min-height:48px;padding:11px 15px;border:1px solid #8fa0ae;border-radius:3px;background:#fff;font-size:16px}.engineering-filters{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.engineering-filters button{min-height:44px;border:1px solid #9cabb7;background:#fff;color:var(--ink);padding:9px 16px;border-radius:3px;font-size:14px}.engineering-filters button[aria-pressed=true]{background:var(--steel);color:white;border-color:var(--steel)}.result-count{font-size:14px;margin:16px 0}.case-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:start}.case-card{min-width:0;border:1px solid #c7d1da;background:#fff;border-radius:4px;overflow:hidden}.case-card>details>summary{display:flex;align-items:center;gap:16px;padding:22px;cursor:pointer;list-style:none;min-height:104px}.case-card summary::-webkit-details-marker{display:none}.case-no{font:600 30px/1 BarlowSemi,Arial,sans-serif;color:#47677f;width:36px;flex-shrink:0}.case-card summary h3{font-size:21px;margin:2px 0;line-height:1.5}.case-card summary small{font-size:13px;color:#596d7d}.case-card summary>div{flex:1;min-width:0}.disclosure-icon{font:28px/1 Arial;color:#526b7e}.case-card>details[open]>summary{border-bottom:1px solid var(--line);background:#f7f9fa}.case-card>details[open]>summary .disclosure-icon{transform:rotate(45deg)}.case-body{padding:24px}.case-body>p:first-child{margin-top:0}.case-body p{font-size:16px}.formula-block{padding:17px;border-left:3px solid var(--accent);background:#f2f5f7;margin:20px 0}.formula-block strong{display:block;font-size:14px;margin-bottom:8px}.formula-block code{font:15px/1.9 ui-monospace,Consolas,monospace;overflow-wrap:anywhere;white-space:normal}.worked-example{margin:20px 0}.worked-example summary{cursor:pointer;padding:10px 0;color:#244f6d;text-decoration:underline;text-underline-offset:4px;min-height:44px}.worked-example ol{font-size:15px;padding-left:22px;line-height:1.9}.calc-inputs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.case-body fieldset{border:0;margin:22px 0;padding:0;min-width:0}.case-body legend{padding:0;margin-bottom:16px;font-weight:600}.calc-inputs label{display:block;font-size:14px;line-height:1.6;margin-bottom:6px}.calc-inputs .unit{color:#566b7c;white-space:nowrap}.calc-inputs input{width:100%;min-width:0;min-height:48px;padding:10px;border:1px solid #869cae;border-radius:3px;font-size:16px;background:#fff;color:#202b36;font-variant-numeric:tabular-nums}.calc-inputs input[aria-invalid=true]{border:2px solid var(--alert)}.calc-inputs small{display:block;color:#536575;font-size:12px;margin-top:4px}.calc-actions{display:flex;gap:8px;flex-wrap:wrap}.calc-actions .btn{font-size:14px;padding:10px 13px}.calc-results{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;margin-top:20px}.calc-results>div{background:#eaf0f4;padding:15px;min-width:0;border-top:2px solid #57768d}.calc-results span{display:block;font-size:14px;line-height:1.6;min-height:44px}.calc-results output{display:block;color:#173e5b;font:600 29px/1.4 BarlowSemi,Arial,sans-serif;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.calc-results small{font-size:13px;color:#4e6677}.calc-verdict{font-size:14px!important;color:#2d526a;line-height:1.8}.calc-error{color:var(--alert)!important;background:#fff0ed;border-left:3px solid var(--alert);padding:12px;font-size:14px!important}.case-boundary{border-top:1px solid var(--line);padding-top:19px;margin-top:18px}.case-boundary strong{font-size:14px}.case-boundary p{font-size:14px;margin:7px 0 17px}.case-source{font-size:13px!important;overflow-wrap:anywhere}.case-source a,.text-link,.case-enquiry{color:#205979;text-decoration:underline;text-underline-offset:4px}.case-enquiry{display:inline-block;min-height:44px;padding:10px 0;font-size:14px}.technical-note{font-size:14px!important;padding-left:16px;border-left:3px solid var(--accent);margin-top:28px}
.film-stage{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(250px,1fr);gap:32px;align-items:start}.film-stage video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#203446;border-radius:4px}.film-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.film-controls .btn{font-size:14px;padding:10px 12px}.film-controls label{font-size:14px}.film-controls select{min-height:44px;padding:8px;border:1px solid #8fa0ae;background:white;color:var(--ink);font-size:16px}.film-outline h3{margin:0;font-size:24px}.film-outline p{font-size:14px}.film-outline ol{list-style:none;padding:0;margin:16px 0}.film-outline button{display:flex;gap:12px;width:100%;padding:12px 0;text-align:left;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);font-size:15px;line-height:1.7;min-height:48px}.film-outline time{font:14px/1.8 ui-monospace,monospace;color:#7d531c;flex-shrink:0}.film-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}.film-card{min-width:0;border:1px solid #c7d1da;border-radius:4px;overflow:hidden;background:#fff}.film-select{border:0;background:#fff;padding:0;width:100%;text-align:left;color:var(--ink);height:calc(100% - 44px);display:flex;flex-direction:column}.film-select[aria-pressed=true]{box-shadow:inset 0 0 0 3px #416c88}.film-select img{aspect-ratio:16/9;object-fit:contain;background:#203446}.film-info{display:block;padding:14px 14px 6px}.film-info strong{display:block;font-size:16px;line-height:1.65;margin-bottom:8px}.film-info>span{font-size:13px;color:#5e7181}.film-action{display:block;padding:7px 14px 14px;font-size:14px;color:#245777;margin-top:auto}.direct-film{display:block;text-decoration:underline;font-size:13px;padding:10px 14px;min-height:44px;background:#f0f4f6}.film-transcripts{margin-top:28px;border-block:1px solid var(--line);padding:14px 0}.film-transcripts summary{cursor:pointer;min-height:44px;padding:8px 0;font-weight:600}.film-transcripts article{max-width:850px;padding:18px 0;border-bottom:1px solid #dce3e8}.film-transcripts h3{font-size:20px}.film-transcripts li{margin:8px 0;color:#405867}.film-stage #video-message{font-size:14px;min-height:24px;margin:10px 0}.utility-path{background:#eaf0f4;border-bottom:1px solid #d1dbe3}.utility-path .wrap{display:flex;gap:16px;align-items:center;justify-content:space-between;font-size:14px;min-height:48px;padding-block:8px}.utility-path a{text-decoration:underline;text-underline-offset:4px;padding:6px 0}.nav .wrap{gap:14px}.links{gap:14px}.links a{font-size:14px}.spec-checks{font-size:14px}.product p,.application p,.step p,.news p,.field-grid p{font-size:16px}.scope span,.tag,.application small{font-size:14px}.brand{min-width:0}.brand>div{min-width:0}.back-top{bottom:calc(20px + env(safe-area-inset-bottom,0px))}.section{padding:clamp(48px,6vw,78px) 0}main>section{scroll-margin-top:100px}
@media(max-width:1200px){.links{gap:10px}.brand b{font-size:17px}.film-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.nav .wrap{gap:10px}}
@media(max-width:1050px){.links{display:none;position:absolute;left:0;right:0;top:100%;padding:16px 32px;background:var(--navy);max-height:calc(100dvh - 80px);overflow-y:auto;box-shadow:0 10px 16px #11233322}.links.open{display:flex;flex-direction:column;align-items:stretch}.links a{min-height:44px;padding:10px 0}.menu{display:block}.case-grid{grid-template-columns:1fr}.film-stage{grid-template-columns:minmax(0,1.5fr) minmax(240px,1fr)}.calc-inputs{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:760px){.film-stage{grid-template-columns:1fr;gap:22px}.film-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.engineering .section-head,.film-library .section-head{display:block}.engineering .section-head p,.film-library .section-head p{margin-top:16px}.calc-inputs{grid-template-columns:repeat(2,minmax(0,1fr))}.film-outline h3{font-size:22px}.utility-path .wrap{gap:12px;align-items:flex-start}.utility-path span{max-width:65%}.hero-grid{gap:28px}.film-stage video{scroll-margin-top:100px}.engineering-toolbar input{flex-basis:100%;order:3}.film-controls{gap:8px}.film-controls .btn{flex:1}.film-controls label{margin-left:0}.nav .wrap{min-height:72px}.brand b{font-size:16px}.brand small{font-size:10px;letter-spacing:0}.brand img{width:34px;height:34px}.nav .wrap{gap:6px}.brand{gap:8px}.brand b{max-width:210px}}
@media(max-width:390px){.wrap{width:calc(100% - 28px)}.brand b{font-size:14px;max-width:166px}.brand small{font-size:9px}.brand img{width:28px;height:28px}.nav .wrap{gap:5px}.nav button{padding:7px;min-width:38px}.case-card>details>summary{padding:18px 14px;gap:10px}.case-card summary h3{font-size:19px}.case-body{padding:18px 14px}.calc-inputs{grid-template-columns:1fr}.film-info{padding:10px}.film-info strong{font-size:15px}.film-action{padding-inline:10px}.film-grid{gap:10px}.calc-actions .btn{flex:1}.film-controls .btn{flex-basis:100%}.utility-path .wrap{font-size:13px}.hero h1{font-size:32px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{.nav,.topline,.utility-path,.film-stage,.film-grid,.film-controls,.engineering-toolbar,.engineering-filters,.calc-actions,.case-enquiry,.back-top{display:none!important}.case-grid{display:block}.case-card{margin:14px 0;break-inside:avoid}.case-body{padding:12px}.calc-results{display:flex}.case-card details:not([open])>.case-body{display:block}.film-transcripts>article{display:block}.section{padding:20px 0}.wrap{width:100%}}
/* One anchor offset avoids doubling scroll-padding and scroll-margin. */
html{scroll-padding-top:100px}main>section{scroll-margin-top:0}.engineering,.film-library{scroll-margin-top:0}
@media(max-width:760px){html{scroll-padding-top:88px}.hero-grid{padding-block:34px}.hero p{font-size:16px}.hero h1{margin-top:10px}.actions .btn{min-height:48px}.back-top{width:44px;height:44px}}

.release-link{font-size:14px;padding-block:16px}.release-link a{text-decoration:underline;text-underline-offset:4px}