/* An optional source view of the same worlds. Normal mode remains the default. */
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.worlds main>[hidden],#engineering-view[hidden]{display:none!important}
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.worlds[data-mode="engineering"] .worlds-hero{min-height:100px;height:100px;padding:0;display:block;background:transparent;overflow:visible}
.worlds[data-mode="engineering"] .worlds-hero>.shell,.worlds[data-mode="engineering"] .worlds-hero>img,.worlds[data-mode="engineering"] .worlds-hero>canvas,.worlds[data-mode="engineering"] .worlds-hero:after,.worlds[data-mode="engineering"] .portal-controls{display:none!important}
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.eng-details summary::-webkit-details-marker{display:none}.eng-details summary:after{content:"+";position:absolute;right:7px;top:16px;font-size:21px;font-weight:300}
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.eng-guilloche-panel canvas{aspect-ratio:720/460}
[data-ray-canvas]{aspect-ratio:720/420;min-height:245px}
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.eng-open{padding-block:95px;border-bottom:1px solid var(--eng-line)}
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@media(min-width:1450px){.eng-hero{padding-top:85px;padding-bottom:85px}.eng-orbit canvas{max-height:520px}}
@media(max-width:1100px){.worlds .site-header nav{gap:19px}.worlds .site-header .nav-about{display:none}.eng-hero{gap:24px}.eng-index-label>span:last-child{display:none}.eng-chapter-head,.eng-split{column-gap:35px}.eng-minor-grid{gap:35px}.eng-code{font-size:11px;padding:22px 19px}.eng-panel-bar{padding-inline:16px}}
@media(max-width:760px){.worlds .site-header nav{gap:14px}.worlds .site-header .nav-contact{display:none}.engineering-toggle{padding:8px 10px;font-size:11px}.worlds[data-mode="engineering"] .worlds-hero{height:86px;min-height:86px}.eng-hero{grid-template-columns:1fr;padding-top:48px;padding-bottom:40px;gap:50px}.eng-hero-copy{max-width:570px}#engineering-view .eng-title{font-size:clamp(49px,9vw,70px)}#engineering-view .eng-lead{font-size:16px;max-width:460px}.eng-orbit{max-width:560px;width:100%;margin:auto}.eng-orbit canvas{max-height:430px}.eng-index{align-items:start;gap:20px;font-size:10px}.eng-index nav{gap:14px;justify-content:flex-end}.eng-index-label{white-space:nowrap}.eng-chapter{padding-block:65px}.eng-chapter-head{grid-template-columns:1fr;gap:24px;margin-bottom:32px}.eng-chapter-head>.eng-kicker{margin-bottom:0}.eng-chapter-head>p:not(.eng-kicker){max-width:570px}.eng-split{grid-template-columns:1fr;gap:32px}.eng-split-reverse>.eng-text,.eng-split-reverse>.eng-panel{grid-column:auto;grid-row:auto}.eng-split-reverse>.eng-panel{order:-1}#engineering-view .eng-chapter-head h2{font-size:42px}#engineering-view .eng-equation{font-size:23px}.eng-minor-grid{grid-template-columns:1fr;gap:60px;padding-block:65px}.eng-minor>p:not(.eng-kicker){min-height:0}.eng-open{padding-block:65px}.eng-open header{display:block}.eng-open header>p{margin-top:20px}.eng-research-list li{grid-template-columns:25px 1fr;gap:8px 12px;padding-block:20px}.eng-research-list span{grid-column:2}.eng-principles{grid-template-columns:1fr;gap:32px;padding-block:65px}.eng-ending{padding-block:45px;align-items:start;flex-direction:column}.eng-code{font-size:11px}.eng-kicker{font-size:10px!important}}
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@media(prefers-reduced-motion:reduce){.engineering-switch:after{transition:none}}

/* Black-hole workbenches share the page's quiet, technical visual language. */
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.founder-engineering-link:hover{border-color:#a8f0d0}.founder-engineering-link:focus-visible{outline:2px solid #a8f0d0;outline-offset:6px}
.bh-overview{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding:29px 0;margin:0;list-style:none;border-top:1px solid var(--eng-line);border-bottom:1px solid var(--eng-line)}
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.bh-study-heading{max-width:720px;margin:70px 0 30px}.bh-study-heading .eng-kicker{margin-bottom:17px}#engineering-view .bh-study-heading h3{font-size:clamp(32px,3.5vw,48px);line-height:1.06;margin-bottom:21px}.bh-study-heading>p:last-child{color:var(--eng-muted);margin:0;max-width:650px}
.bh-ray-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px}.bh-ray-views{min-width:0}.bh-ray-workbench [data-ray-canvas]{aspect-ratio:1000/550;min-height:340px}.bh-ray-workbench [data-ray-potential]{aspect-ratio:1000/300;min-height:220px}
.bh-ray-transport{display:flex;align-items:center;gap:25px;padding:17px 25px 20px;border-bottom:1px solid var(--eng-line)}.bh-ray-transport>div{flex:1;min-width:0}.bh-ray-transport label{display:flex;justify-content:space-between;gap:15px;font:10px/1.6 var(--eng-mono);color:var(--eng-muted);margin-bottom:7px}.bh-ray-transport output{color:var(--eng-accent);min-width:30px;text-align:right}
.bh-play{flex:none;cursor:pointer;color:var(--eng-accent);background:#a8f0d009;border:1px solid #a8f0d045;padding:10px 13px;font:11px/1.5 var(--eng-mono);min-width:130px}.bh-play:hover{background:#a8f0d014;border-color:#a8f0d080}.bh-play:disabled{opacity:.4;cursor:default}
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.bh-ray-presets{gap:5px;margin:23px 0 7px}.bh-ray-presets button{padding:7px 9px;font-size:10px}#engineering-view .bh-preset-note{font:9px/1.6 var(--eng-mono);color:var(--eng-muted);margin:0 0 24px}
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.bh-equations{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0 28px}.bh-equations .eng-equation{min-height:119px;display:flex;flex-direction:column;justify-content:center}#engineering-view .eng-equation small{font:inherit;font-size:.74em;line-height:1.8}.bh-equations .eng-note{border-top:0}
.bh-image-stage{position:relative;background:#060b0e}.bh-image-stage canvas{aspect-ratio:1000/560;max-height:690px}.bh-image-stage canvas[data-bh-ready="false"]{visibility:hidden}.bh-image-fallback{position:absolute;left:25px;right:25px;top:40%;text-align:center;color:var(--eng-muted);font:12px/1.8 var(--eng-mono)!important}.bh-image-fallback[hidden]{display:none}.bh-image-play{position:absolute;right:22px;bottom:20px;background:#080f14cc}.bh-image-play[hidden]{display:none}
.bh-image-layers{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--eng-line)}.bh-image-layers button{position:relative;padding:23px 24px 23px 53px;text-align:left;background:transparent;border:0;color:var(--eng-muted);cursor:pointer}.bh-image-layers button+button{border-left:1px solid var(--eng-line)}.bh-image-layers button>span{position:absolute;left:24px;top:25px;font:10px/1.6 var(--eng-mono)}.bh-image-layers strong{display:block;font-size:15px;font-weight:400}.bh-image-layers small{display:block;font:10px/1.7 var(--eng-mono);margin-top:7px}.bh-image-layers button[aria-pressed="true"]{color:var(--eng-accent);background:#a8f0d008;box-shadow:inset 0 -2px var(--eng-accent)}.bh-image-layers button:hover{color:var(--eng-accent)}
.bh-image-controls{display:grid;grid-template-columns:1.3fr 1fr;gap:50px;padding:27px 25px}.bh-image-controls .bh-control+.bh-control{margin:0}.bh-image-explanation{margin-top:37px}.bh-image-explanation .eng-equation{font-size:clamp(20px,2.25vw,31px)}
@media(max-width:1100px){.bh-ray-layout{grid-template-columns:minmax(0,1fr) 268px}.bh-ray-controls{padding:23px 18px}.bh-ray-transport{padding-inline:20px;gap:15px}.bh-play{min-width:115px;font-size:10px}.bh-ray-transport label{font-size:9px}.bh-overview{gap:23px}.bh-image-layers button{padding-left:43px}.bh-image-layers button>span{left:17px}}
@media(max-width:900px){.bh-ray-layout{grid-template-columns:1fr}.bh-ray-controls{border-left:0;border-top:1px solid var(--eng-line);display:grid;grid-template-columns:1fr 1fr;gap:20px 30px;padding:27px}.bh-control+.bh-control{margin:0}.bh-ray-presets{margin:0;align-content:start}.bh-preset-note{align-self:center}.bh-outcome{grid-column:1;padding:17px 0}.bh-ray-readouts{margin:0;align-self:center}.bh-resolution{margin:0}.bh-reset{justify-self:start;margin:0;align-self:start}.bh-ray-workbench [data-ray-canvas]{min-height:330px}.bh-overview li{gap:10px}.bh-overview strong{font-size:14px}.bh-equations{gap:16px}#engineering-view .bh-equations .eng-equation{font-size:23px}}
@media(max-width:760px){.bh-overview{grid-template-columns:1fr;gap:22px;padding-block:25px}.bh-overview li{gap:19px}.bh-overview strong{font-size:16px}#engineering-view .bh-overview p{max-width:510px;margin-top:6px}.bh-study-heading{margin-top:50px}.bh-equations{grid-template-columns:1fr;gap:16px}.bh-equations .eng-equation{min-height:0}.bh-image-controls{gap:25px}.bh-image-layers button{padding:20px 15px}.bh-image-layers button>span{position:static;display:block;margin-bottom:10px}.bh-image-layers strong{font-size:13px}.bh-image-layers small{font-size:9px}.bh-image-stage canvas{min-height:270px;object-fit:contain}.bh-image-explanation{margin-top:30px}.bh-image-play{right:15px;bottom:15px}}
@media(max-width:520px){.bh-ray-controls{grid-template-columns:1fr;padding:23px;gap:21px}.bh-ray-presets{margin-top:0}#engineering-view .bh-preset-note{margin-top:-15px;margin-bottom:0}.bh-outcome{grid-column:auto}.bh-outcome p{min-height:0!important}.bh-ray-readouts{margin:0}.bh-ray-transport{display:block;padding:17px 20px}.bh-ray-transport>div{margin-top:17px}.bh-ray-transport label{font-size:9px}.bh-ray-transport .bh-play{min-width:135px}.bh-potential-heading{padding:19px 18px 3px;font-size:8px}.bh-ray-workbench [data-ray-canvas]{min-height:280px}.bh-ray-workbench [data-ray-potential]{min-height:225px}.bh-image-controls{grid-template-columns:1fr;padding:23px;gap:25px}.bh-image-layers button{padding:17px 12px}.bh-image-layers small{line-height:1.5}.bh-image-stage canvas{min-height:220px}.bh-image-play{padding:7px 9px;min-width:110px}.bh-image-fallback{top:24%;font-size:10px!important}.bh-overview{padding-right:10px}}