/* Shared assembl-EE interface. The equipment stays the focus; navigation and instruments
   use one vocabulary across the catalogue, substation, solar and wind lessons. */
:root{--ee-ink:#25313b;--ee-muted:#586c79;--ee-accent:#934b29;--ee-accent-soft:#f6ece5;--ee-line:#d4dfe5;--ee-surface:#fff;--ee-canvas:#edf1f4;--ee-radius:12px;--ee-header:68px;--ee-sidebar:280px;--ee-control-width:304px;--accent:var(--ee-accent);--line:var(--ee-line)}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--ee-ink)}
button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}
:where(button,a,input,select,summary,canvas):focus-visible{outline:3px solid var(--ee-accent);outline-offset:3px}
.site-header{height:var(--ee-header);display:flex;align-items:center;gap:24px;padding:0 28px;background:var(--ee-surface);border-bottom:1px solid var(--ee-line);position:relative;z-index:10}
.site-header .brand{display:flex;align-items:center;gap:9px;font-size:23px;font-weight:650;letter-spacing:-.7px;text-decoration:none;color:var(--ee-ink);flex-shrink:0}
.site-header .brand svg{width:27px;height:27px;fill:none;stroke:var(--ee-accent);stroke-width:1.8;stroke-linejoin:round}
.site-header .brand span{font-size:inherit;color:inherit}
.site-header .site-purpose{font-size:12px;color:var(--ee-muted);display:block}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:4px;height:100%}
.site-nav a{display:flex;align-items:center;justify-content:center;min-height:40px;padding:0 13px;color:var(--ee-muted);font-size:13px;text-decoration:none;border-radius:7px;white-space:nowrap}
.site-nav a:hover{background:#f3f6f8;color:var(--ee-ink)}
.site-nav a[aria-current=page]{background:var(--ee-accent-soft);color:var(--ee-accent);font-weight:600}
.lesson-page main{display:grid;grid-template-columns:var(--ee-sidebar) minmax(0,1fr);height:calc(100dvh - var(--ee-header));min-height:620px}
.lesson-page aside{display:flex;flex-direction:column;min-height:0;height:auto;overflow:hidden;padding:26px 20px 18px;background:var(--ee-surface);border:0;border-right:1px solid var(--ee-line)}
.lesson-page .intro{display:block}
.lesson-page :is(.model-heading,.intro){flex-shrink:0}
.lesson-page aside h1{font-size:28px;line-height:1.16;letter-spacing:-.75px;font-weight:600;margin:13px 0 10px}
.lesson-page :is(.model-heading,.intro)>p:last-child{font-size:12px;line-height:1.5;color:var(--ee-muted);margin:0}
.lesson-page .eyebrow{font-size:10px;font-weight:600;letter-spacing:1px;color:var(--ee-accent)}
.lesson-page aside .list-heading{margin:24px 0 10px;display:flex;align-items:center;justify-content:space-between;font-size:13px;flex-shrink:0}
.lesson-page aside .list-heading h2{font-size:13px;margin:0}.lesson-page aside .list-heading span{font-size:12px;color:var(--ee-muted)}
.lesson-page #parts-list{flex:1;min-height:100px;overflow:auto;overscroll-behavior:contain;display:flex;flex-direction:column;gap:3px}
.lesson-page #parts-list button{border:0;border-radius:7px;background:transparent;display:flex;gap:10px;align-items:center;min-height:43px;flex-shrink:0;padding:10px 9px;text-align:left;font-size:13px;line-height:1.4;color:var(--ee-ink)}
.lesson-page #parts-list button:hover{background:#f1f5f7}
.lesson-page #parts-list button[aria-pressed=true]{background:var(--ee-accent-soft);color:var(--ee-accent)}
.lesson-page :is(.part-swatch,#parts-list button:before){width:7px;height:7px;border-radius:2px}
.lesson-page aside :is(.part-detail,#part-detail){flex-shrink:0;border-top:1px solid var(--ee-line);padding-top:16px;margin-top:16px;min-height:0;max-height:30vh;overflow:auto}
.lesson-page aside :is(.part-detail,#part-detail) h2{font-size:17px;line-height:1.25;font-weight:600;margin:8px 0}
.lesson-page aside :is(.part-detail,#part-detail) p{font-size:13px;line-height:1.65;color:var(--ee-muted);margin:0 0 8px}
.lesson-page :is(.schematic-note,.reference){font-size:10px;line-height:1.5;color:var(--ee-muted);margin:12px 0 0;padding:0;flex-shrink:0}
.lesson-page #viewer{position:relative;min-width:0;min-height:0;height:auto;max-height:none;background:var(--ee-canvas);overflow:hidden}
.lesson-page #canvas-container,.lesson-page #labels{inset:0}
.lesson-page .viewer-heading{top:16px;left:16px;display:flex;flex-direction:column;align-items:flex-start;gap:9px;z-index:4}
.lesson-page :is(.back-to-yard,.viewer-back){position:relative;top:auto;left:auto;min-height:38px;padding:9px 12px;border:1px solid var(--ee-line);border-radius:7px;background:#fff;color:var(--ee-ink);font-size:12px;line-height:18px;text-decoration:none;pointer-events:auto;margin:0;display:inline-flex;align-items:center;gap:7px}
.lesson-page .viewer-back{position:absolute;top:16px;left:16px;z-index:4}
.lesson-page :is(#view-name,.view-tag){font-size:11px;font-weight:500;color:var(--ee-muted)}
.lesson-page #view-name{top:64px;left:20px}.lesson-page .view-caption{display:none}
.lesson-page :is(.wind-label,.model-label){font-size:11px;line-height:1.4;padding:6px 9px;border:1px solid #c7d4dc;border-radius:6px;background:#ffffffed;color:#405865}
.lesson-page :is(.viewer-footer,.gesture-hint){position:absolute;bottom:0;left:0;right:0;height:32px;padding:9px 16px;margin:0;border:0;font-size:10px;color:var(--ee-muted);background:#edf1f4dc;line-height:1.4;max-width:none;z-index:2;pointer-events:none}
.lesson-page .model-type,.lesson-page .axis-key{display:none}
/* Identical panel frame and controls, with equipment-specific content inside. */
#wind-controls.ee-panel,#floating-controls.ee-panel,#motor-controls.ee-panel{position:absolute;width:var(--ee-control-width);max-width:calc(100% - 24px);max-height:calc(100% - 108px);border:1px solid #c7d4dc;border-radius:var(--ee-radius);background:var(--ee-surface);box-shadow:none;display:flex;flex-direction:column;overflow:hidden;z-index:6;font-size:13px}
.ee-panel .ee-panel-header{position:static;display:flex;align-items:center;gap:3px;min-height:44px;height:44px;flex-shrink:0;padding:0 6px;border:0;border-bottom:1px solid var(--ee-line);background:#fff}
.ee-panel .ee-panel-header button{font-family:inherit;min-width:34px;min-height:36px;height:36px;border:0;border-radius:6px;background:transparent;padding:4px 7px;color:var(--ee-muted);font-size:18px;font-weight:400;margin:0}
.ee-panel .ee-panel-header button:hover{background:#f1f5f7;color:var(--ee-ink)}
.ee-panel .ee-panel-header :is(.controls-handle,#drag-controls){display:flex;align-items:center;gap:7px;flex:1;text-align:left;font-size:12px;font-weight:600;cursor:grab;touch-action:none;user-select:none}
.ee-panel .ee-panel-header .dragging{cursor:grabbing}
#floating-controls .ee-panel-body,#wind-controls .ee-panel-body,#motor-controls .ee-panel-body{padding:14px;overflow:auto;overscroll-behavior:contain;min-height:0;max-height:none;font-size:13px}
.ee-panel-body :is(button,select){border:1px solid var(--ee-line);border-radius:7px;background:#f8fafb;color:#405865;min-height:38px;padding:8px 10px;font-size:12px;line-height:1.3;box-shadow:none}
#control-body :is(button,select),.controls-body :is(.option-button,.control-panel-trigger,.disconnect-focus,.inspect-subassembly,.clear-selection){font-size:12px;border-radius:7px;min-height:38px;padding:8px 10px}
.ee-panel-body button:hover{background:#eef3f5;color:var(--ee-ink)}
.ee-panel-body button[aria-pressed=true],#control-body button[aria-pressed=true]{background:var(--ee-accent-soft);border-color:#cfad98;color:var(--ee-accent)}
.ee-panel-body button:disabled{opacity:.48;cursor:default}
.ee-panel-body :is(label,legend){font-size:12px;color:var(--ee-ink)}
.ee-panel-body output{float:right;color:var(--ee-accent);font-size:13px;font-weight:600;font-variant-numeric:tabular-nums;min-width:0}
.ee-panel-body input[type=range]{width:100%;appearance:none;-webkit-appearance:none;height:24px;margin:2px 0;background:transparent!important;accent-color:var(--ee-accent);cursor:pointer;display:block}
.ee-panel-body input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:#d8e1e6}
.ee-panel-body input[type=range]::-webkit-slider-thumb{appearance:none;width:18px;height:18px;margin-top:-7px;border:3px solid white;background:var(--ee-accent);box-shadow:0 1px 3px #24313b40;border-radius:50%}
.ee-panel-body input[type=range]::-moz-range-track{height:4px;border-radius:4px;background:#d8e1e6}
.ee-panel-body input[type=range]::-moz-range-thumb{height:12px;width:12px;border:3px solid white;background:var(--ee-accent);border-radius:50%}
.ee-panel .control-group-label{font-size:11px;font-weight:600;color:var(--ee-muted);margin:6px 0 9px;line-height:1.4}
.ee-panel .view-options{margin:0 0 10px;display:flex;gap:6px}
.ee-panel .controls-focus{gap:6px}.ee-panel .controls-focus:empty{display:none}
.ee-panel :is(.operator-heading h2,.explosion-header>label){font-size:13px!important;font-weight:600}
.ee-panel .range-endpoints{gap:8px;margin-top:3px}.ee-panel .range-endpoints button{flex:1;font-size:12px;min-height:38px}
.ee-panel #assembly-toggle{display:none}
.ee-panel .yard-instruction{font-size:12px;line-height:1.5;color:var(--ee-muted)}
.ee-panel :is(.control-note,.operator-message,.input-hint){font-size:11px;line-height:1.5;color:var(--ee-muted)}
.ee-panel :is(.viewport-toolbar,.ee-camera){display:flex;align-items:center;justify-content:center;gap:6px;border-top:1px solid var(--ee-line);padding-top:12px;margin-top:12px}
.ee-panel .viewport-toolbar button{width:38px;height:38px;min-height:38px;padding:8px}
.ee-panel .ee-camera #clear{flex:1}.ee-panel .ee-camera :is(#zoom-in,#zoom-out){width:38px;font-size:19px}
.ee-panel .control-modes{margin:0 0 4px;padding:0 0 12px;gap:6px}
#control-body [role=tab]{font-size:12px;padding:9px 8px;min-height:38px}
#control-body [role=tab][aria-selected=true]{background:#405865;border-color:#405865;color:white}
#operation-controls h2{font-size:21px;margin:4px 0;letter-spacing:-.4px}
#operation-controls :is(.operation-intro,.operation-explanation){font-size:12px;line-height:1.6}
#operation-controls .wind-inputs label{font-size:13px}
#operation-controls .wind-inputs input{height:24px}
#operation-controls .operation-output strong{font-size:24px}
/* The catalogue shares the same chrome, input sizes and selection treatment. */
.catalogue-page .hub-main{max-width:1320px;padding:0 40px}
.catalogue-page .topic-search input{border:1px solid var(--ee-line);border-radius:7px;min-height:42px;color:var(--ee-ink)}
.catalogue-page .topic-roster button{border-radius:7px;min-height:40px;font-size:13px}
.catalogue-page .topic-roster button[aria-pressed=true]{color:var(--ee-accent);background:var(--ee-accent-soft);border-color:#cfad98}
.catalogue-page .selection-navigation button{min-width:42px;min-height:42px;border:1px solid var(--ee-line);border-radius:7px;color:var(--ee-ink);background:#fff}
.catalogue-page .hub-footer{font-size:11px;color:var(--ee-muted)}
@media(max-width:1000px){
 :root{--ee-header:104px}
 .site-header{height:104px;display:grid;grid-template-columns:1fr;grid-template-rows:54px 50px;padding:0 16px;gap:0}
 .site-header .brand{font-size:22px;justify-self:start}.site-header .site-purpose{display:none}
 .site-nav{margin:0;gap:4px;width:100%;height:50px;border-top:1px solid #edf1f4;justify-content:space-between}
 .site-nav a{font-size:12px;flex:1;min-height:36px;padding:0 8px}
 .lesson-page main{display:flex;flex-direction:column;height:auto;min-height:0}
 .lesson-page #viewer{order:0;height:calc(100dvh - 104px);min-height:620px;max-height:none}
 .lesson-page aside{order:1;height:500px;border:0;padding:22px 20px;gap:0}
 .lesson-page :is(.intro,.model-heading){display:block}
 .lesson-page aside h1{font-size:24px;margin:8px 0}.lesson-page .eyebrow{display:none}
 .lesson-page aside .list-heading{margin-top:18px}
 .lesson-page aside :is(.part-detail,#part-detail){max-height:180px}
 #wind-controls.ee-panel,#floating-controls.ee-panel,#motor-controls.ee-panel{width:var(--ee-control-width);max-width:calc(100% - 24px);max-height:46%;}
 .ee-panel.is-collapsed{width:210px!important}
 .ee-panel-body :is(button,select),#control-body :is(button,select){min-height:40px}
 .lesson-page .viewer-heading,.lesson-page .viewer-back{top:12px;left:12px}
 .lesson-page #view-name{top:60px;left:16px}
 .lesson-page :is(.viewer-footer,.gesture-hint){font-size:9px;padding:9px 12px}
 .lesson-page .desktop-hint{display:none}.lesson-page .touch-hint{display:inline}
 .catalogue-page .hub-main{padding:0 20px}
}
@media(prefers-reduced-motion:reduce){.ee-panel-body button,.site-nav a{transition:none}}
.ee-panel .viewport-toolbar #reset-view{width:auto;flex:1;font-size:12px}
.ee-panel .viewport-toolbar :is(#zoom-in,#zoom-out){font-size:19px;display:flex;align-items:center;justify-content:center}
.arc-dialog{font-family:inherit;border-radius:var(--ee-radius);color:var(--ee-ink);border-color:var(--ee-line)}
.arc-dialog button{font-family:inherit;border-radius:7px;min-height:40px}
.arc-dialog :is(p,.arc-footnote){color:var(--ee-muted)}
.site-header .brand span{display:inline}
/* Engineering Lab: persistent topic rail, model stage, contextual inspector. */
.lesson-page aside{order:0}.lesson-page #viewer{order:1}
.site-header .site-purpose{border-left:1px solid var(--ee-line);padding-left:20px;font-size:13px;color:var(--ee-ink)}
.lesson-page .site-header .site-purpose{display:none}
.workspace-breadcrumb{display:flex;align-items:center;gap:14px;font-size:12px;min-width:0;color:var(--ee-muted);margin-left:12px}
.workspace-breadcrumb strong{font-weight:550;color:var(--ee-ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:320px}
.site-header .header-topics-link{margin-left:auto;font-size:12px;color:var(--ee-muted);min-height:40px;padding:11px 14px;border:1px solid var(--ee-line);border-radius:7px;text-decoration:none}
.workspace-topics{flex-shrink:0;border-bottom:1px solid var(--ee-line);padding:0 0 18px;margin:0 0 22px}
.workspace-section-label{font-size:11px;font-weight:600;color:var(--ee-muted);margin:0 0 8px}
.workspace-topics .site-nav{display:flex;flex-direction:column;gap:3px;height:auto;margin:0;border:0;align-items:stretch}
.workspace-topics .site-nav a{flex:none;justify-content:flex-start;padding:10px 12px;min-height:40px;font-size:13px}
.workspace-topics .site-nav a:before{content:'';width:6px;height:6px;border:1px solid currentColor;margin-right:10px;border-radius:2px}
.workspace-topics .site-nav a[aria-current=page]:before{background:currentColor}
.lesson-page aside :is(.intro,.model-heading){margin:0}
.lesson-page aside h1{font-size:23px;line-height:1.2;margin:8px 0}
.lesson-page aside .eyebrow{display:none}
.lesson-page aside .list-heading{margin-top:22px}
.ee-panel-body :is(.part-detail,#part-detail){border:0;border-bottom:1px solid var(--ee-line);margin:0 0 14px;padding:0 0 14px;min-height:0;max-height:none;overflow:visible}
.ee-panel-body :is(.part-detail,#part-detail) :is(.eyebrow,.detail-kicker){display:none}
.ee-panel-body :is(.part-detail,#part-detail) h2{font-size:20px;line-height:1.25;letter-spacing:-.3px;font-weight:600;margin:0 0 9px;color:var(--ee-ink)}
.ee-panel-body :is(.part-detail,#part-detail) p{font-size:12px;line-height:1.6;color:var(--ee-muted);margin:0}
.ee-panel-body .material-row{font-size:11px;margin-top:10px}
.ee-panel-body .material-row>span{color:var(--ee-muted)}
#wind-controls.operation-mode #part-detail{display:none}
.lesson-page .schematic-note{padding-top:12px;border-top:1px solid var(--ee-line)}
@media(max-width:1000px){
 .lesson-page .site-header{height:64px;display:flex;padding:0 16px;gap:14px}
 .lesson-page .site-header .brand{font-size:21px}
 .lesson-page .workspace-breadcrumb{margin-left:0;font-size:11px;gap:6px;flex:1;justify-content:flex-end}
 .lesson-page .workspace-breadcrumb>span:not(:first-child),.lesson-page .workspace-breadcrumb strong{display:none}
 .lesson-page .site-header .header-topics-link{font-size:11px;padding:9px;min-height:36px;margin:0}
 .lesson-page #viewer{order:0;height:calc(100dvh - 64px)}
 .lesson-page aside{order:1;height:auto;min-height:540px;padding:22px 16px}
 .lesson-page #parts-list{max-height:350px;min-height:100px;flex:auto}
 .workspace-topics{padding-bottom:16px;margin-bottom:18px}
 .workspace-topics .site-nav{flex-direction:row;gap:4px}
 .workspace-topics .site-nav a{justify-content:center;padding:9px 7px;flex:1;font-size:12px}
 .workspace-topics .site-nav a:before{display:none}
 .lesson-page .reference{margin-top:16px}
}
.workspace-breadcrumb>span:first-child{display:inline}
.mobile-topics{display:none}
@media(max-width:1000px){
 .mobile-topics{height:44px;display:flex;align-items:center;gap:4px;padding:4px 12px;background:white;border-bottom:1px solid var(--ee-line)}
 .mobile-topics a{flex:1;text-align:center;font-size:12px;padding:8px 6px;border-radius:6px;text-decoration:none;color:var(--ee-muted)}
 .mobile-topics a[aria-current=page]{background:var(--ee-accent-soft);color:var(--ee-accent);font-weight:600}
 .lesson-page #viewer{height:calc(100dvh - 108px)}
 .workspace-topics{display:none}
}
/* Inspector content keeps its natural height and scrolls instead of compressing text rows. */
#wind-controls #control-body,#motor-controls #control-body{grid-auto-rows:max-content;align-content:start}
/* A growing library uses one searchable switcher, never a fixed row of topic tabs. */
.topic-switcher{display:flex;align-items:center;gap:10px;width:100%;min-width:0;padding:10px;border:1px solid var(--ee-line);border-radius:8px;background:#fff;text-align:left;color:var(--ee-ink);cursor:pointer}
.topic-switcher:hover{background:#f8fafb;border-color:#a9bbc5}
.topic-switcher>svg{width:30px;height:30px;flex-shrink:0;color:var(--ee-accent)}
.topic-switcher>span:not(.switcher-chevron){min-width:0;flex:1}
.topic-switcher small{display:block;font-size:10px;color:var(--ee-muted);margin-bottom:3px}
.topic-switcher strong{display:block;font-size:13px;font-weight:600;line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topic-switcher .switcher-chevron{font-size:18px;color:var(--ee-muted)}
.library-open{border:1px solid var(--ee-line);border-radius:7px;padding:10px 14px;min-height:40px;background:#fff;color:var(--ee-ink);font-size:13px;cursor:pointer}
.topic-library{width:min(660px,calc(100vw - 32px));max-height:min(780px,calc(100dvh - 48px));padding:24px;border:1px solid var(--ee-line);border-radius:14px;background:#fff;color:var(--ee-ink);overflow:auto;overscroll-behavior:contain;box-shadow:0 24px 80px #172b3c33}
.topic-library::backdrop{background:#23374666;backdrop-filter:blur(4px)}
.library-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:22px}
.library-heading h2{font-size:28px;letter-spacing:-.7px;margin:0;font-weight:600}
.library-heading .workspace-section-label{margin-bottom:7px}
.library-close{width:36px;height:36px;min-width:36px;min-height:36px;background:#f3f6f8;border:1px solid var(--ee-line);border-radius:7px;font-size:24px;color:var(--ee-muted);cursor:pointer}
.library-search-label{display:block;font-size:12px;font-weight:600;margin-bottom:7px}
.topic-library input{display:block;width:100%;height:44px;border:1px solid #b7c8d1;border-radius:7px;padding:0 12px;background:#fff;color:var(--ee-ink);font-size:14px;box-sizing:border-box}
.library-count{font-size:11px;color:var(--ee-muted);margin:10px 0 18px}
.library-results section+section{margin-top:26px}
.library-results h3{font-size:12px;font-weight:600;margin:0 0 9px;color:var(--ee-muted)}
.library-topic{display:flex;align-items:center;gap:14px;padding:14px 10px;border-bottom:1px solid #e6edf1;text-decoration:none;color:var(--ee-ink);border-radius:6px}
a.library-topic:hover{background:#f3f6f8}.library-topic[aria-current=page]{background:var(--ee-accent-soft)}
.library-icon{display:flex;align-items:center;justify-content:center;width:40px;height:40px;flex-shrink:0;color:var(--ee-accent)}
.library-icon svg{width:38px;height:38px}
.library-topic>div{flex:1;min-width:0}.library-topic strong{font-size:14px;font-weight:600;line-height:1.4}
.library-topic p{font-size:12px;line-height:1.5;color:var(--ee-muted);margin:4px 0 0}
.library-arrow{font-size:12px;color:var(--ee-accent);flex-shrink:0}
.library-empty{font-size:14px;line-height:1.6;color:var(--ee-muted);padding:20px 0}
@media(min-width:1001px){.workspace-breadcrumb>span{display:inline}}
@media(max-width:1000px){
 .mobile-topics{padding:3px 12px}
 .mobile-topics .topic-switcher{border:0;padding:3px 0;height:38px;gap:9px}
 .mobile-topics .topic-switcher>svg{width:25px;height:25px}
 .mobile-topics .topic-switcher small{display:none}
 .mobile-topics .topic-switcher strong{font-size:12px}
 .topic-library{padding:20px;max-height:calc(100dvh - 24px)}
 .library-topic{padding:13px 4px;gap:10px}.library-icon{width:30px}.library-icon svg{width:30px}
 .library-heading h2{font-size:25px}
 .catalogue-page .site-header{height:68px;display:flex;gap:12px}
 .catalogue-page .site-nav{border:0;width:auto;height:auto;margin-left:auto;gap:8px}
 .catalogue-page .site-nav>a{display:none}
 .catalogue-page .library-open{font-size:12px;padding:9px 12px}
}
/* Keep the keyboard skip link above the shared masthead. */
.skip-link{z-index:20}
/* One continuous landing surface; only content gets a reading-width constraint. */
.catalogue-page{background:#edf1f2}
.catalogue-page .hub-main{width:100%;max-width:none;margin:0;padding:0}
.catalogue-page .site-header{background:#edf1f2}
.catalogue-page .site-purpose{margin-left:auto;border:0;padding:0;color:var(--ee-muted)}
.catalogue-page .hero-assembly{width:100%;height:calc(100svh - 68px);background:transparent;border-bottom:0}
.catalogue-page .hero-copy{padding-left:max(32px,calc((100vw - 1240px)/2));padding-top:clamp(100px,16vh,170px)}
.catalogue-page .hero-transformer{right:max(0px,calc((100vw - 1440px)/2));width:min(57%,820px)}
.catalogue-page .hero-bottom{left:max(32px,calc((100vw - 1240px)/2));right:max(32px,calc((100vw - 1240px)/2))}
.catalogue-page .hero-scroll{font-size:11px;color:var(--ee-muted)}
.catalogue-page .hub-main>#topics{max-width:1240px;margin:0 auto;padding:70px 32px 32px;scroll-margin-top:24px;outline:none}
.catalogue-page .hub-footer{max-width:1176px;margin:44px auto 0;padding:24px 0 32px}
.catalogue-page .topics-heading{padding-top:0;align-items:center}
.catalogue-page .topics-heading p{max-width:510px}
.catalogue-page .topic-count{margin:20px 0 32px;font-size:12px}
.library-section-title{font-size:14px;letter-spacing:0;font-weight:600;margin:0 0 18px;color:var(--ee-ink)}
.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.lesson-card{display:flex;flex-direction:column;min-width:0;border-bottom:1px solid #c4d1d8;padding-bottom:24px;transition:background .2s;color:var(--ee-ink)}
.lesson-card .topic-model{height:270px;transition:transform .3s cubic-bezier(.16,1,.3,1)}
.lesson-card:hover .topic-model{transform:translateY(-6px)}
.lesson-card:hover h3{color:var(--ee-accent)}
.lesson-card-copy{padding:0 10px}
.lesson-card h3{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:21px;letter-spacing:-.4px;line-height:1.3;margin:12px 0 12px;font-weight:600}
.lesson-card h3 span{font-size:21px;color:var(--ee-accent)}
.lesson-card p{font-size:13px;line-height:1.65;color:var(--ee-muted);margin:0}
.lesson-card:focus-visible{outline-offset:6px;border-radius:4px}
#upcoming-topics{margin-top:62px}
.upcoming-heading{margin-bottom:10px}
.upcoming-heading .library-section-title{margin-bottom:6px}
.upcoming-heading p{font-size:13px;color:var(--ee-muted);margin:0}
.upcoming-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:48px}
.upcoming-topic{display:flex;align-items:center;gap:18px;padding:22px 0;border-bottom:1px solid #d2dde2}
.upcoming-icon{width:38px;height:38px;flex-shrink:0;color:#627986}.upcoming-icon svg{width:100%;height:100%}
.upcoming-topic h4{font-size:14px;font-weight:600;margin:0 0 5px}.upcoming-topic p{font-size:12px;color:var(--ee-muted);line-height:1.6;margin:0;max-width:430px}
.preview-unavailable{display:grid;place-items:center;font-size:13px;color:var(--ee-muted)}
@media(max-width:1000px){
 .catalogue-page .hero-copy{padding-left:32px}.catalogue-page .hero-transformer{width:53%}
 .catalogue-page .hub-footer{margin-left:32px;margin-right:32px}
 .lesson-grid{gap:16px}.lesson-card .topic-model{height:220px}.lesson-card h3{font-size:18px}
}
@media(max-width:700px){
 .catalogue-page .hero-assembly{height:auto;min-height:850px}
 .catalogue-page .hero-copy{padding:48px 24px 0}
 .catalogue-page .hero-transformer{inset:400px 0 52px;width:100%;height:400px}
 .catalogue-page .hero-bottom{left:24px;right:24px;bottom:20px}
 .catalogue-page .hub-main>#topics{padding:42px 24px 24px}
 .catalogue-page .topics-heading{align-items:stretch;gap:22px;flex-direction:column}
 .catalogue-page .topic-search{width:100%}
 .lesson-grid{grid-template-columns:1fr;gap:28px}
 .lesson-card{padding-bottom:26px}.lesson-card .topic-model{height:260px}.lesson-card h3{font-size:23px}
 .lesson-card-copy{padding:0}.lesson-card p{font-size:14px}
 .upcoming-list{grid-template-columns:1fr}.upcoming-topic{padding:20px 0}
 .catalogue-page .hub-footer{margin-left:24px;margin-right:24px}
}
@media(prefers-reduced-motion:reduce){.lesson-card,.lesson-card .topic-model{transition:none}.lesson-card:hover .topic-model{transform:none}}
/* The landing study is decorative; wheel and touch gestures always scroll the page. */
.catalogue-page .hero-transformer,.catalogue-page .hero-transformer canvas{pointer-events:none;touch-action:auto;cursor:default}

#motor-controls .ee-camera{margin-top:2px}
#motor-inspection,#motor-principle{display:grid;gap:10px;min-width:0}
#motor-principle h2{font-size:20px;line-height:1.3;letter-spacing:-.3px;margin:0 0 10px}
#motor-principle p{font-size:12px;line-height:1.6;margin:0;color:var(--ee-muted)}
#motor-principle .demo-step-count{font-size:10px;margin:7px 0;color:var(--ee-accent);font-weight:600}
.motor-demo-steps{display:flex;gap:5px}
#motor-principle .motor-demo-steps button{flex:1;font-size:11px;padding:8px 4px}
#motor-principle .motor-demo-steps button[aria-current=step]{background:var(--ee-accent-soft);color:var(--ee-accent);border-color:#c9ab94}
.phase-readings{padding:12px 0;border-top:1px solid var(--ee-line);border-bottom:1px solid var(--ee-line)}
.phase-readings>div{display:flex;align-items:center;gap:8px;margin-top:5px;font-size:11px}
.phase-readings>div>span{width:12px;font-weight:600}
.phase-readings output{width:32px;font-size:10px;font-variant-numeric:tabular-nums;color:var(--ee-muted);text-align:right}
.phase-readings meter{flex:1;height:12px}
meter::-webkit-meter-bar{background:#e2e8ec;border:0;border-radius:3px}
meter::-webkit-meter-optimum-value{background:#617d8e}
#phase-a::-webkit-meter-optimum-value{background:#ae6540}#phase-b::-webkit-meter-optimum-value{background:#665986}#phase-c::-webkit-meter-optimum-value{background:#34766b}
.motor-demo-legend{display:grid;gap:5px}
.motor-demo-legend span{font-size:18px;font-weight:600;margin-right:4px}
.field-key{color:#2674b4}.current-key{color:#b85818}.force-key{color:#368275}
#motor-principle small{font-size:10px;line-height:1.5;color:var(--ee-muted)}
#demo-speeds{padding:10px 0;border-top:1px solid var(--ee-line)}
#demo-speeds label{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px}
#demo-speeds meter{width:100px;height:14px}
#motor-principle #demo-next{background:#405865;color:white;border-color:#405865}
#motor-principle #demo-restart{border:0;background:transparent;font-size:11px;padding:4px;min-height:30px;color:var(--ee-muted)}
.demo-reference{color:var(--ee-accent);font-size:10px;text-decoration:underline;line-height:1.5}

.site-header .account-nav{flex-shrink:0;min-height:40px;display:flex;align-items:center;color:var(--ee-accent);font-size:13px;text-decoration:none;padding:0 8px}.site-header .account-nav:hover{text-decoration:underline}

.access-dialog{width:min(460px,calc(100% - 32px));max-height:calc(100dvh - 32px);overflow:auto;border:1px solid var(--ee-line);border-radius:12px;background:var(--ee-surface);color:var(--ee-ink);padding:28px;box-sizing:border-box}.access-dialog::backdrop{background:#17242c80}.access-dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.access-label{font-size:12px;font-weight:600;color:var(--ee-accent)}.access-dialog .access-close{min-width:44px;min-height:44px;border:0;background:transparent;font-size:26px;color:var(--ee-muted);cursor:pointer}.access-dialog h2{font-size:28px;line-height:1.2;letter-spacing:-.025em;margin:16px 0}.access-description{font-size:15px;line-height:1.65;color:var(--ee-muted)}.access-price{display:flex;align-items:center;gap:20px;margin:26px 0}.access-price strong{font-size:38px;font-weight:600;letter-spacing:-.03em;white-space:nowrap}.access-price span{font-size:14px;line-height:1.5;max-width:16ch;color:var(--ee-muted)}.access-includes{padding:16px 0 16px 22px;margin:0 0 16px;border-block:1px solid var(--ee-line);font-size:14px;line-height:2}.access-primary{display:flex;justify-content:center;align-items:center;min-height:46px;padding:10px 16px;background:var(--ee-accent);color:white;text-decoration:none;border-radius:7px;font-size:14px;font-weight:600}.access-primary:hover{background:#773b20}.access-primary[aria-disabled=true]{opacity:.65;cursor:wait}.access-signin{font-size:14px;text-align:center;margin:16px 0;color:var(--ee-muted)}.access-signin a,.access-free{color:var(--ee-accent)}.access-free{display:block;font-size:14px;line-height:1.6;text-align:center;padding:14px 0;min-height:44px}.access-note{font-size:12px;color:var(--ee-muted);text-align:center;margin:0;line-height:1.6}.access-status{font-size:13px;color:var(--ee-accent);line-height:1.6}.access-status:empty{display:none}@media(max-width:480px){.access-dialog{padding:20px}.access-dialog h2{font-size:25px}}
.lesson-access{display:block;font-size:12px;font-weight:600;color:var(--ee-muted);margin-bottom:10px}
a[aria-busy=true]{cursor:progress;opacity:.7}

/* Keep lesson navigation reachable while the explanation scrolls on phones. */
@media(max-width:1000px){#motor-controls .control-modes{position:sticky;top:-14px;z-index:3;background:var(--ee-surface);padding-top:8px}#motor-principle .demo-actions{grid-row:2}}

/* Motor starting lesson inherits the shared Inspector. */
#motor-controls .control-modes button{font-size:11px;padding-inline:5px}
#motor-starting{display:grid;gap:12px;min-width:0}
#motor-starting select{width:100%;min-height:44px;padding:9px;border:1px solid var(--ee-line);border-radius:7px;background:var(--ee-surface);color:var(--ee-ink);font:inherit;font-size:12px}
#motor-starting select:disabled{opacity:.65}
#motor-starting p{margin:0;font-size:12px;line-height:1.65;color:var(--ee-muted)}
#motor-starting h2{font-size:18px;margin:8px 0 0;line-height:1.35}
#motor-starting small{font-size:11px;color:var(--ee-muted)}
#motor-starting #start-status{font-weight:600;color:var(--ee-accent)}
#motor-starting #start-motor:not(:disabled){background:#405865;color:white;border-color:#405865}
#motor-starting label{font-size:12px}
#vfd-setting{display:grid;gap:8px}
.starting-readouts{display:grid;gap:12px;padding-block:14px;border-block:1px solid var(--ee-line)}
.starting-readouts label{display:grid;grid-template-columns:1fr auto;gap:5px}
.starting-readouts output{font-variant-numeric:tabular-nums;font-weight:600}
.starting-readouts meter{grid-column:1/-1;width:100%;height:12px}
#motor-starting .starter-chain{font-size:11px;font-weight:600;color:var(--ee-ink)}

#controller-parts{display:grid;gap:3px;margin-bottom:22px}
#controller-parts button{text-align:left;background:transparent;border:0;border-radius:6px;padding:9px 10px;color:var(--ee-ink);font:inherit;font-size:12px;line-height:1.5;cursor:pointer}
#controller-parts button:hover{background:var(--ee-accent-soft)}
#controller-parts button[aria-pressed=true]{background:var(--ee-accent-soft);color:var(--ee-accent)}
#motor-starting #controller-detail{font-size:11px}
/* One scroll area keeps both equipment and motor parts reachable. */
.lesson-page aside:has(#controller-components:not([hidden])){overflow-y:auto;overscroll-behavior:contain}
#controller-components{flex-shrink:0}
.lesson-page aside:has(#controller-components:not([hidden])) #parts-list{flex:none;overflow:visible;max-height:none}
.lesson-page aside:has(#controller-components:not([hidden]))>.intro{flex-shrink:0}

/* Keep the existing equipment navigation reachable inside the Inspector. */
.controls-body .equipment-picker-row{display:flex;flex-direction:column;align-items:stretch;gap:6px;margin-bottom:12px}
.controls-body .equipment-picker-row select{width:100%;max-width:none;min-height:40px}
.lesson-page #viewer-error{position:absolute;inset:16px;top:35%;bottom:auto;z-index:9;max-width:440px;margin:auto;padding:20px;background:var(--ee-surface);border:1px solid var(--ee-line);border-radius:var(--ee-radius);color:var(--ee-ink)}
.lesson-page #viewer-error h2{font-size:18px;margin:0 0 10px}
.lesson-page #viewer-error p{font-size:13px;line-height:1.6}
.lesson-page #viewer-error button{min-height:44px;padding:10px 16px;border:1px solid var(--ee-line);border-radius:7px;background:#f8fafb;color:var(--ee-accent)}
.lesson-page :is(.equipment-code,.equipment-count,.part-number){color:var(--ee-muted)}

.lesson-page #phase-selector>span{color:var(--ee-muted)}
.arc-viewer-error{position:absolute;inset:20px;z-index:2;display:grid;align-content:center;background:var(--ee-surface);padding:20px;color:var(--ee-ink);font-size:13px;line-height:1.6}
.arc-viewer-error button{min-height:44px;border:1px solid var(--ee-line);border-radius:7px;background:#f8fafb;color:var(--ee-accent);cursor:pointer}

.topic-library .developer-link{display:inline-block;margin-top:18px;color:var(--ee-muted);font-size:12px}
.library-footer>a{color:var(--ee-muted);text-underline-offset:3px}

.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.topic-switcher strong{font-size:13px}.topic-library .library-heading{margin-bottom:16px}.access-dialog-heading{justify-content:flex-end}.access-status:empty,.control-note:empty,.input-hint:empty,.operation-explanation:empty{display:none}.lesson-page #part-detail:has(#detail-description:empty){min-height:0}