:root{color-scheme:light;--ink:#203c3a;--teal:#176e60;--muted:#708078;--line:#dce5dd}*{box-sizing:border-box}body{margin:0;background:#f5f6ee;color:var(--ink);font:15px/1.6 system-ui,-apple-system,sans-serif}header,main{max-width:960px;margin:auto;padding:20px 28px}header{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);font-size:12px}a{color:var(--teal);text-decoration:none}.brand{font-weight:800}.brand span{color:#bf8542}.intro{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}h1{font-size:32px;letter-spacing:-1px;margin:0}h2{font-size:16px;margin:0}h3{font-size:14px;margin:0}p{margin:6px 0}.eyebrow{font-size:10px;letter-spacing:2px;color:var(--teal)}.intro p:not(.eyebrow){font-size:13px;color:var(--muted)}button{font:inherit;font-size:13px;background:#fff;border:1px solid var(--line);padding:9px 14px;border-radius:8px;color:var(--ink);cursor:pointer}button:hover{background:#e8f0e5}button.active,#next{background:var(--teal);border-color:var(--teal);color:#fff}button:disabled{opacity:.5;cursor:default}:focus-visible{outline:3px solid #d5a24f;outline-offset:3px}.mode{display:flex;gap:5px}.mode span{font-size:10px}.scope-switch{display:flex;gap:6px;margin-bottom:18px}.scope-switch button{flex:1}.panel{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.quiet{border:0;background:none;font-size:12px;padding:6px}.hands-eyes{display:grid;grid-template-columns:minmax(0,1fr) 32px minmax(0,1fr);gap:16px;align-items:start;margin-top:20px}.hands-on,.eye-side{min-width:0}.view-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;height:24px}.view-title>span{font-size:10px;color:var(--muted)}.eye-heading{height:24px;margin:0 0 10px;font-size:14px;font-weight:700}.eye-side .view-title{display:none}#slide-pad{height:260px;border:6px solid #789084;border-radius:16px;background:linear-gradient(145deg,#456057,#203c36);position:relative;overflow:hidden;isolation:isolate}.pad-top,.pad-bottom{position:absolute;left:0;right:0;text-align:center;font-size:10px;color:#d8e9d9;pointer-events:none}.pad-top{top:8px}.pad-bottom{bottom:8px}.stage-aperture{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:65px;height:65px;border-radius:50%;background:#dce8c8;border:3px solid #152e28;box-shadow:0 0 0 8px #1c342d}.stage-clip{position:absolute;top:25%;width:11px;height:45%;border:2px solid #adbab0;background:linear-gradient(90deg,#60776d,#c1cfc4,#60776d);border-radius:6px;pointer-events:none}.clip-left{left:13%}.clip-right{right:13%}#physical-slide{position:absolute;left:50%;top:calc(50% - 36px);width:62%;max-width:175px;height:72px;border:2px solid #c6f7eb;background:linear-gradient(135deg,#dcfff047,#edfff085 45%,#aee8d638);border-radius:4px;box-shadow:0 6px 12px #061f294d;cursor:grab;touch-action:none;user-select:none}#physical-slide:active{cursor:grabbing}.glass-label{position:absolute;left:0;top:0;bottom:0;width:23%;background:#e7f0ddee;writing-mode:vertical-rl;display:grid;place-items:center;font-size:10px;letter-spacing:3px;color:#395948}.coverslip{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:44px;height:44px;border:1px solid #e7fff5a0;background:#e2f8dc35}.specimen-letter{position:absolute;left:3px;top:16px;font:bold 28px/1 Georgia;color:#244332}.specimen-dot{position:absolute;left:calc(50% - 3px);top:calc(50% - 3px);width:6px;height:6px;background:#c34f3d;border-radius:50%}.moving #physical-slide{border-color:#f5cb79;box-shadow:0 0 0 3px #efb86155}.motion-readout{font-size:12px;text-align:center;color:var(--teal);min-height:24px;margin:10px 0}.optical-link{padding-top:120px;text-align:center;color:#809480;font-size:24px}.optical-link small{display:none}.eyepiece{position:relative;aspect-ratio:1;width:100%;max-width:260px;margin:auto;border-radius:50%;border:9px solid #263e3a;box-shadow:0 0 0 3px #c4cfc2;background:#eaf0dd;overflow:hidden;cursor:ns-resize}.eyepiece canvas{display:block;width:100%;height:100%}.crosshair{position:absolute;left:50%;top:50%;width:22px;height:22px;border:1px dashed #38544a88;border-radius:50%;transform:translate(-50%,-50%);pointer-events:none}.image-position{font-size:11px;text-align:center;color:var(--muted);margin-top:12px}.focus-control{border-top:1px solid var(--line);margin-top:12px;padding-top:14px}.dial-row{display:flex;gap:16px;align-items:center;justify-content:center}.focus-wheel{width:72px;height:72px;flex:0 0 72px;cursor:grab;touch-action:none;user-select:none;border-radius:50%}.focus-wheel:active{cursor:grabbing}.focus-wheel[aria-disabled=true]{opacity:.45}.focus-dial{display:block;position:relative;width:100%;height:100%;border:5px solid #4c675b;border-radius:50%;background:repeating-conic-gradient(#304b40 0deg 8deg,#6d8475 8deg 16deg);box-shadow:0 3px 0 #b3c1ae;transform:rotate(var(--dial-angle,0deg));pointer-events:none}.focus-dial:before{content:"";position:absolute;inset:7px;border-radius:50%;background:#344f43}.focus-dial i{position:absolute;left:calc(50% - 2px);top:8px;width:4px;height:17px;border-radius:2px;background:#f4cb78}output{font-size:11px;color:var(--teal)}.microcopy{font-size:10px;color:var(--muted);text-align:center;margin-top:10px}.feedback{padding:12px 16px;margin-top:18px;background:#eef4e9;border-radius:9px;font-size:13px}.feedback.success{background:#def0da}.hint-row{margin-top:7px}.text-button{font-size:12px;border:0;padding:5px 0;color:var(--teal);background:none}#hint-text{font-size:12px;color:var(--muted)}.mission{display:flex;align-items:center;justify-content:space-between;gap:12px;background:#203f37;color:#fff;border-radius:12px;padding:15px 18px;margin-bottom:16px}.mission .eyebrow{color:#bbd7b6}.mission p:not(.eyebrow){font-size:12px}.mission h2{font-size:15px}.teacher,.model-details{border-bottom:1px solid var(--line);padding:15px 2px;font-size:12px;color:var(--muted)}summary{font-size:12px;cursor:pointer;color:var(--ink)}.teacher p{margin-top:12px}#scene{height:240px;position:relative;max-width:400px;margin:12px auto;background:#e7efe2;border-radius:12px;overflow:hidden}#scene canvas{display:block}.scene-label,#scene-status{position:absolute;font-size:11px;left:12px;top:12px}.scene-label{top:auto;bottom:10px}footer{display:flex;justify-content:space-between;padding:22px 0;font-size:10px;color:var(--muted)}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@media(max-width:600px){header{padding:13px 16px}main{padding:14px 12px}.intro{align-items:flex-start;margin-bottom:12px;gap:8px}.intro .eyebrow{display:none}h1{font-size:24px}.intro p:not(.eyebrow){font-size:11px;margin-top:3px}.mode{gap:3px}.mode button{font-size:11px;padding:8px}.mode span{display:none}.scope-switch{margin-bottom:12px}.scope-switch button{padding:8px;font-size:12px}.panel{padding:13px;border-radius:13px}.section-head h2{font-size:13px}.hands-eyes{grid-template-columns:minmax(0,1fr) 12px minmax(0,1fr);gap:7px;margin-top:14px}.view-title h3,.eye-heading{font-size:12px}.view-title>span{display:none}#slide-pad{height:180px;border-width:4px;border-radius:12px}.eyepiece{border-width:6px}.optical-link{padding-top:103px;font-size:17px}.stage-aperture{width:48px;height:48px}#physical-slide{height:56px;top:calc(50% - 28px);width:65%}.coverslip{width:34px;height:34px}.specimen-letter{font-size:22px;left:2px;top:11px}.glass-label{font-size:9px;letter-spacing:1px}.motion-readout{font-size:10px;min-height:30px;margin:7px 0}.focus-control{padding-top:10px;margin-top:5px}.dial-row{gap:9px}.focus-wheel{width:62px;height:62px;flex-basis:62px}.dial-row h3{font-size:11px}output{font-size:10px}.microcopy{font-size:9px}.feedback{font-size:11px;padding:10px 12px;margin-top:12px}.image-position{font-size:10px}.mission{padding:12px;margin-bottom:12px}.mission h2{font-size:13px}.mission p:not(.eyebrow){font-size:11px}footer{padding:15px 0}footer>span{display:none}}
@media(max-width:360px){.intro{display:block}.mode{margin-top:9px}.hands-eyes{gap:5px;grid-template-columns:minmax(0,1fr) 8px minmax(0,1fr)}.dial-row{gap:6px}.focus-wheel{width:56px;height:56px;flex-basis:56px}.panel{padding:10px}#slide-pad{height:165px}.microcopy{font-size:8px}}

.scope-map{display:flex;align-items:center;justify-content:center;gap:18px;margin:12px 0 0;background:#f3f6ef;border-radius:10px}.scope-map svg{width:min(100%,360px);height:120px;display:block}.scope-map p{font-size:12px}.scope-map small{display:block;font-size:10px;color:var(--muted)}.dual-dials{display:flex;justify-content:center;align-items:start;gap:26px;margin-top:14px}.dial-item{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;min-width:0}.dial-item>span{font-size:12px;margin-top:9px}.dial-item>small{font-size:10px;color:var(--muted)}.fine-wheel{width:56px;height:56px;flex-basis:56px;margin-top:16px}.fine-wheel .focus-dial{border-color:#9b8156}.focus-control .section-head{flex-wrap:wrap;gap:4px}
@media(max-width:600px){.scope-map{gap:0;margin-top:8px}.scope-map svg{height:94px;width:100%;max-width:320px}.scope-map p{display:none}.dual-dials{gap:12px;margin-top:10px}.dial-item>span{font-size:10px}.dial-item>small{font-size:9px}.dual-dials .focus-wheel{width:56px;height:56px;flex-basis:56px}.dual-dials .fine-wheel{width:46px;height:46px;flex-basis:46px;margin-top:10px}.focus-control h3{font-size:11px}.scope-map svg text{font-size:13px}}
@media(max-width:360px){.dual-dials{gap:8px}.dual-dials .focus-wheel{width:50px;height:50px;flex-basis:50px}.dual-dials .fine-wheel{width:44px;height:44px;flex-basis:44px;margin-top:6px}}

.scope-map{overflow:hidden;min-width:0}.scope-map svg{flex:0 1 360px;min-width:0;width:360px;max-width:100%;height:auto;aspect-ratio:18/7}.scope-map svg path,.scope-map svg rect,.scope-map svg circle{vector-effect:non-scaling-stroke}.scope-map p{flex-shrink:0;padding-right:16px}#scene canvas{width:100%!important;height:100%!important;max-width:100%}
@media(max-width:600px){.scope-map svg{flex:0 1 320px;width:100%;max-width:320px;height:auto}.scope-map svg path,.scope-map svg rect,.scope-map svg circle{vector-effect:none}}

.lighting{border-top:1px solid var(--line);padding-top:14px;margin-top:12px}.lighting h3{font-size:14px}.light-setting{margin-top:13px}.light-setting label{display:flex;align-items:center;gap:7px;font-size:12px}.light-setting output{margin-left:auto}.light-setting input{width:100%;accent-color:var(--teal);margin:10px 0 0;min-height:24px}.lighting p{font-size:11px;color:var(--muted);line-height:1.6;min-height:36px}.iris-icon{width:17px;height:17px;border-radius:50%;background:radial-gradient(circle,#e3efce 0 calc(var(--opening,65%)*.45),#385b48 calc(var(--opening,65%)*.45) 100%);display:inline-block}.lamp-icon{color:#ae823a;font-size:18px}.lighting .text-button{font-size:11px}
@media(max-width:600px){.lighting{padding-top:10px;margin-top:5px}.lighting h3{font-size:11px}.light-setting{margin-top:8px}.light-setting label{font-size:10px}.lighting p{font-size:10px}.lighting .text-button{font-size:10px}}

#physical-slide{will-change:transform}.eyepiece{contain:paint}