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@media(max-width:600px){.assembly-layer{top:235px}.hub-layer{top:290px}.assembly-stage{height:400px}.stage-axis{top:85px}}

/* Keep every transformed plane inside the illustration at both endpoints. */
.assembly-stage{height:600px}
@media(max-width:900px) and (min-width:601px){.assembly-stage{height:550px}}
@media(max-width:600px){.assembly-stage{height:470px}.assembly-layer{top:180px}.hub-layer{top:200px}.assembly-pin{padding-top:24px}.assembly-copy h2{font-size:40px}.assembly-copy>p:not(.eyebrow){min-height:50px}}
/* Reference study: exploded pale enclosure, thin electronics, numbered leaders,
   and a distinct PCB inspection view. Geometry is illustrative, not fabrication data. */
.reference-assembly{background:#101b2d;color:#e9ecef;height:240vh;min-height:1450px;border-color:#344053}
.reference-assembly .assembly-pin{display:block;padding:32px 5vw;min-height:100svh;overflow:hidden}
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.reference-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:50px;align-items:center;margin-top:12px}
.reference-assembly .assembly-visual{padding:0}
.reference-assembly .assembly-stage{height:610px;perspective:1200px;overflow:visible}
.reference-assembly .assembly-layer,.reference-assembly .hub-layer{width:300px;height:180px;top:0;left:0;filter:drop-shadow(0 8px 3px #03091465);object-fit:contain}
.part-callout{position:absolute;top:0;left:58%;font:10px/1.25 Arial;display:flex;align-items:center;gap:12px;white-space:nowrap;will-change:transform,opacity}
.part-callout span{font:9px monospace;color:#8e9eb4}.part-callout strong{font-weight:400}.part-callout i{position:absolute;right:calc(100% + 10px);width:70px;height:1px;background:#7b8c9e;transform:rotate(-8deg);transform-origin:right}.part-callout i::before{content:'';position:absolute;left:0;top:-2px;width:4px;height:4px;border-radius:50%;background:#a4b4c4}
.reference-assembly .assembly-caption{border-color:#344053;color:#aebccb;font-size:9px;padding:9px 0}
.board-detail{align-self:center;border-left:1px solid #344053;padding:25px 0 25px 30px;min-width:0}.board-detail-label{font:10px monospace;letter-spacing:.14em;color:#a6b7c5}.board-detail img{width:100%;max-width:360px;transform:rotate(7deg);margin:20px 0}.board-detail>p:not(.board-detail-label){font:24px Georgia,serif;margin:6px 0 10px}.board-detail>span{display:block;font:10px monospace;line-height:1.6;color:#a6b7c5}.board-detail a{display:inline-block;font-size:11px;margin-top:25px;text-underline-offset:6px;min-height:30px}
.reference-assembly .assembly-bottom{display:grid;grid-template-columns:1fr 1.5fr;gap:70px;align-items:center;margin-top:18px}.reference-assembly .assembly-control{color:#bdc6d0;max-width:250px;font-size:9px}.reference-assembly .assembly-control input{accent-color:#e1e7e9}.reference-assembly #assembly-note{font:10px/1.6 monospace;color:#9fafc1;max-width:650px;margin:0}
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@media(prefers-reduced-motion:reduce){.reference-assembly{height:auto;min-height:0}.reference-assembly .assembly-pin{position:relative}.part-callout{will-change:auto}}
@media(min-width:480px) and (max-width:600px){.reference-layout{display:grid;grid-template-columns:1fr .36fr;gap:10px;align-items:center}.reference-assembly .assembly-layer{width:180px;left:-24px}.part-callout{left:52%;max-width:120px;font-size:8px}.part-callout i{width:20px}.board-detail{display:block;border:0;border-left:1px solid #344053;padding:15px 0 15px 12px}.board-detail img{width:100%;margin:12px 0}.board-detail-label{font-size:8px}.board-detail>p:not(.board-detail-label){font-size:16px;line-height:1.15}.board-detail>span{font-size:7px;line-height:1.6;margin-top:10px}.reference-assembly .assembly-caption{font-size:6px;letter-spacing:.03em}}

@media(min-width:601px) and (max-height:850px){.reference-assembly .assembly-pin{padding:22px 4vw}.reference-assembly .assembly-copy h2{font-size:48px}.reference-assembly .assembly-copy .eyebrow{margin-bottom:10px}.reference-assembly .assembly-stage{height:455px}.reference-assembly .assembly-layer{width:240px;height:150px}.reference-assembly .assembly-bottom{margin-top:12px}.reference-assembly .assembly-control{margin-top:0}.reference-assembly #assembly-note{font-size:9px}.board-detail img{max-width:280px;margin:10px 0}.board-detail{padding-top:10px;padding-bottom:10px}}

/* Reference sequence: exploded → aligned → assembled, with one fixed focal axis. */
.closure-scene{position:relative;background:#292144;isolation:isolate;height:260vh;min-height:1600px}
.closure-light{position:absolute;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 52% 54%,#d8d3ec 0%,#a59bc7 47%,#5b507d 100%);opacity:0}
.closure-scene .assembly-pin{height:100svh;min-height:0;padding:30px 5vw 22px;display:flex;flex-direction:column;gap:0}
.closure-scene .assembly-copy{display:flex;justify-content:space-between;align-items:start;gap:45px;width:100%;max-width:none;flex-shrink:0}
.closure-scene .assembly-copy h2{font-size:clamp(36px,4.5vw,64px);line-height:.94;letter-spacing:-.035em;margin:0;color:#fff}
.closure-scene .assembly-copy>p:not(.eyebrow){max-width:330px;min-height:44px;font-size:12px;color:#fff;margin:5px 0 0;line-height:1.5;text-shadow:0 1px 10px #292144}
.closure-scene .reference-layout{display:block;position:relative;width:100%;flex:1;min-height:0;margin:0}
.closure-scene .assembly-visual,.closure-scene .assembly-stage{position:absolute;inset:0;height:100%;width:100%;min-height:0;padding:0;overflow:visible;perspective:1100px}
.closure-scene .assembly-layer{width:430px;height:278px;top:0;left:50%;transform-origin:center;filter:drop-shadow(0 7px 3px #17112c44);object-fit:contain;z-index:1}
.closure-scene .part-callout{left:calc(50% + 172px);color:#fff;font-size:10px;z-index:2;pointer-events:none}
.closure-scene .part-callout span{color:#d2cce5}.closure-scene .part-callout i{width:45px;background:#d2cce5}
.closure-scene .assembly-caption{position:absolute;right:0;bottom:22px;padding:0;border:0;display:flex;flex-direction:column;align-items:end;gap:12px;color:#fff;font-size:10px;letter-spacing:.06em;z-index:3}
.closure-scene .assembly-caption a{font:12px Arial;color:inherit;min-height:32px;text-underline-offset:5px}
.closure-scene .assembly-bottom{display:flex;align-items:center;justify-content:space-between;gap:35px;width:100%;margin:0;flex-shrink:0;min-height:72px}
.closure-scene .assembly-control{font-size:10px;width:230px;max-width:230px;color:#fff}.closure-scene .assembly-control input{accent-color:#f1ecfa}
.closure-scene #assembly-note{font:11px/1.5 Arial;color:#fff;max-width:470px;margin:0;text-shadow:0 1px 10px #292144}
.closure-ground{position:absolute;top:83%;left:50%;width:270px;height:27px;border-radius:50%;background:#1e143d;filter:blur(15px);opacity:.12;transform:translateX(-50%) scale(.75);pointer-events:none}
@media(max-height:850px),(max-width:600px){.closure-scene .assembly-layer{width:370px;height:240px}.closure-scene .part-callout{left:calc(50% + 145px)}.closure-scene .assembly-copy h2{font-size:44px}.closure-scene .assembly-pin{padding-top:26px}}
@media(max-width:600px){.closure-scene .assembly-pin{padding:26px 6vw 18px}.closure-scene .assembly-copy{gap:15px}.closure-scene .assembly-copy h2{font-size:37px}.closure-scene .assembly-copy>p:not(.eyebrow){font-size:11px;max-width:140px}.closure-scene .assembly-layer{width:320px;height:207px}.closure-scene .part-callout{display:none}.closure-scene .assembly-bottom{display:block;min-height:120px}.closure-scene #assembly-note{font-size:10px;margin-top:9px}.closure-scene .assembly-control{display:block;max-width:200px}.closure-scene .assembly-caption{bottom:12px;font-size:9px;gap:7px;align-items:start;left:0;right:auto}.closure-ground{width:220px}}
@media(prefers-reduced-motion:reduce){.closure-scene .assembly-layer{will-change:auto}.closure-light{display:none}}

.closure-scene .assembly-pin{background:linear-gradient(to bottom,#292144dd 0,transparent 25%,transparent 65%,#292144dd 100%)}
.closure-scene .part-callout{left:calc(50% + 215px)}
@media(max-height:850px),(max-width:600px){.closure-scene .part-callout{left:calc(50% + 185px)}}
@media(max-width:600px){.closure-scene .assembly-copy h2{font-size:34px;min-width:190px}.closure-scene #assembly-title br{display:block}.closure-scene .assembly-copy>p:not(.eyebrow){max-width:120px;font-size:10px}.closure-scene .assembly-copy{gap:12px}}

/* Keep scene illumination attached to the pinned frame throughout the scroll. */
.closure-scene .assembly-pin{background:none}
.closure-scene .closure-light{background:linear-gradient(to bottom,#292144dd 0,transparent 25%,transparent 65%,#292144dd 100%),radial-gradient(ellipse at 52% 54%,#d8d3ec 0%,#a59bc7 47%,#5b507d 100%)}

/* One deliberate click animates the scene; document scrolling has no role. */
:root{--ease-in-out:cubic-bezier(.77,0,.175,1);--assembly-duration:1200ms}
.closure-scene{height:auto;min-height:0}
.closure-scene .assembly-pin{position:relative}
.closure-scene .assembly-layer{transition:transform var(--assembly-duration) var(--ease-in-out)}
.closure-scene .part-callout{transition:transform var(--assembly-duration) var(--ease-in-out),opacity 300ms var(--ease-out)}
.closure-scene .closure-light{transition:opacity var(--assembly-duration) var(--ease-in-out)}
.closure-scene .closure-ground{transition:transform var(--assembly-duration) var(--ease-in-out),opacity var(--assembly-duration) var(--ease-in-out)}
#assembly-toggle{border:1px solid #e9e3f599;border-radius:999px;background:#f5f0ff0a;color:#fff;min-width:216px;min-height:48px;padding:12px 26px;font:12px Arial;letter-spacing:.04em}
#assembly-toggle:focus-visible{outline:3px solid #fff;outline-offset:5px}
@media(hover:hover) and (pointer:fine){#assembly-toggle:hover{background:#f3edf8;color:#292144}}
@media(prefers-reduced-motion:reduce){.closure-scene .assembly-layer,.closure-scene .part-callout,.closure-scene .closure-light,.closure-scene .closure-ground{transition:none}}
.closure-scene .assembly-layer[data-layer="0"]{transform:translate3d(-50%, 375.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="1"]{transform:translate3d(-50%, 297.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="2"]{transform:translate3d(-50%, 219.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="3"]{transform:translate3d(-50%, 141.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="4"]{transform:translate3d(-50%, 63.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="5"]{transform:translate3d(-50%, -15.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
@media(max-height:850px),(max-width:600px){
.closure-scene .assembly-layer[data-layer="0"]{transform:translate3d(-50%, 255.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="1"]{transform:translate3d(-50%, 197.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="2"]{transform:translate3d(-50%, 139.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="3"]{transform:translate3d(-50%, 81.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="4"]{transform:translate3d(-50%, 23.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
.closure-scene .assembly-layer[data-layer="5"]{transform:translate3d(-50%, -35.0px, 0) rotateX(60deg) rotateZ(-16deg) scale(1)}
}