.header .course-tabs{gap:23px}.header-note{display:none}.light-intro h1{font-size:clamp(32px,3.7vw,50px)}.light-intro .intro-row>p{font-size:12px}.light-lessons{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-bottom:22px;scroll-margin-top:24px}.light-lessons button{display:flex;align-items:center;gap:9px;text-align:left;background:#191c18;border:1px solid #31382c;border-radius:6px;padding:13px 11px;font-size:11px;color:#aeb6a4;line-height:1.4}.light-lessons button>span{color:#7d8971;font-size:9px;font-variant-numeric:tabular-nums}.light-lessons button:hover{background:#262b22;color:#f0eee8}.light-lessons button[aria-pressed="true"]{background:#2c2b23;border-color:#8c765c;color:#f2dcc0}.light-lessons button[aria-pressed="true"]>span{color:var(--accent)}
.light-lab{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(350px,1fr);border:1px solid var(--line);border-radius:13px;background:var(--surface);overflow:hidden}.light-visual{border-right:1px solid var(--line);min-width:0;background:#151914}.light-viewport{position:relative;aspect-ratio:4/3;background:#11150f;overflow:hidden}.light-viewport canvas{display:block;width:100%;height:100%;object-fit:contain}.light-scene-heading{position:absolute;top:19px;left:20px;right:20px;display:flex;justify-content:space-between;gap:10px;align-items:center}.light-scene-heading>span{font-size:8px;letter-spacing:1.1px;color:#e5e3d8;background:#10150d9c;padding:7px 8px;border:1px solid #ffffff24;border-radius:4px}.light-view-switch{display:flex;gap:2px;padding:3px;background:#11180bc7;border:1px solid #65745866;border-radius:5px}.light-view-switch button{font-size:9px;background:none;color:#acb7a0;padding:5px 8px;border-radius:3px}.light-view-switch button[aria-pressed="true"]{background:#dfc7a3;color:#25281c}.light-scene-caption{position:absolute;left:24px;bottom:23px;display:flex;flex-direction:column;gap:7px;pointer-events:none;text-shadow:0 1px 6px #000}.light-scene-caption>span{font-size:13px;color:#e7e5d9}.light-scene-caption small{font-size:9px;color:#bbc5ad}.light-unavailable{position:absolute;inset:0;display:flex;justify-content:center;flex-direction:column;background:#20271c;padding:35px;color:#cbd4bf;line-height:1.8;font-size:13px}.light-unavailable strong{font-weight:500;font-size:20px}.light-unavailable button{align-self:flex-start;background:#dac4a3;color:#252b20;padding:10px 16px;border-radius:5px}
.light-source-toggles{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line)}.light-source-toggles button{display:flex;align-items:center;gap:10px;padding:16px;background:none;text-align:left;color:#c4cbb9;border-right:1px solid var(--line);font-size:11px}.light-source-toggles button:last-child{border-right:0}.light-source-toggles b{display:grid;place-items:center;width:23px;height:23px;border-radius:50%;background:#b69c6f24;color:#d5b891;font-size:10px;font-weight:500;border:1px solid #ab956b55}.light-source-toggles button:nth-child(2) b{color:#a7c1d3;background:#91b6ca20;border-color:#91b6ca55}.light-source-toggles button:nth-child(3) b{color:#baa6d3;background:#baa6d320;border-color:#baa6d355}.light-source-toggles small{display:block;font-size:8px;color:#8a9980;margin-top:4px}.light-source-toggles i{width:5px;height:5px;border-radius:50%;background:#9dad86;margin-left:auto;flex-shrink:0;box-shadow:0 0 7px #b7d38b44}.light-source-toggles button[aria-pressed="false"]{opacity:.52}.light-source-toggles button[aria-pressed="false"] i{background:#5b6054;box-shadow:none}.light-source-toggles button:hover{background:#a4b68d0c}
.light-instruments{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:23px}.light-plan-title{font-size:8px;letter-spacing:1.25px;color:#a2b090;display:flex;justify-content:space-between;gap:10px}.light-plan-title span{font-size:8px;letter-spacing:0;color:#7e8d72}.light-plan{position:relative;touch-action:none;max-width:320px;margin:11px auto 0;cursor:crosshair}.light-plan svg{display:block;width:100%;height:auto;stroke-width:1;stroke:none;fill:none}.light-plan svg text{font-family:inherit;fill:#849477;font-size:8px;letter-spacing:.7px}.plan-orbit{stroke:#526044;stroke-dasharray:2 5}.plan-grid{stroke:#3b4632}.plan-camera{stroke:#97a785}.plan-subject{fill:#60734b;stroke:#aab897}.plan-nose{fill:#aab897}.plan-ray{stroke-dasharray:3 4;opacity:.65}.key-ray{stroke:#d6b681}.fill-ray{stroke:#9abacc}.rim-ray{stroke:#bfa2d6}#light-plan-fill circle{stroke:#91b6ca;fill:#263b40}#light-plan-rim circle{stroke:#baa6d3;fill:#3b2c43}#light-plan-fill text,#light-plan-rim text{fill:#e0e8d8;letter-spacing:0;font-size:9px}#light-plan-handle{position:absolute;transform:translate(-50%,-50%);border:1px solid #f2d1a4;border-radius:50%;width:29px;height:29px;padding:0;background:#dbc19b;color:#252c1c;font-size:12px;box-shadow:0 0 0 5px #dfc49e13;cursor:grab;touch-action:none}#light-plan-handle:active{cursor:grabbing}.light-plan-help{font-size:9px;color:#859579;line-height:1.7;margin:7px 0 0}.light-readout{padding-top:1px}.light-readout>.eyebrow{font-size:8px;letter-spacing:1.3px}.light-readout dl{margin:15px 0 0}.light-readout dl>div{display:flex;align-items:center;justify-content:space-between;gap:9px;border-bottom:1px solid #303b28;padding:12px 0}.light-readout dt{font-size:10px;color:#a0ae92}.light-readout dd{font-size:14px;font-variant-numeric:tabular-nums;color:#dec9aa;margin:0;white-space:nowrap}.light-readout>p{font-size:11px;line-height:1.8;color:#b1bea1;margin:16px 0 0}.light-readout .light-ratio-note{font-size:8px;color:#849477;margin-top:10px;line-height:1.7}
.light-explanation{display:flex;flex-direction:column;min-width:0;padding:26px}.light-explanation h2{font-size:28px;font-weight:450;letter-spacing:-.7px;line-height:1.22;margin:17px 0 14px}.light-explanation .composition-body{margin-bottom:16px}.light-exercise{padding:12px 13px;background:#23291e;border:1px solid #3b4631;border-radius:6px;margin-bottom:23px}.light-exercise span{font-size:8px;letter-spacing:1.4px;color:#acbd97}.light-exercise p{font-size:11px;line-height:1.8;color:#bbc9a9;margin:5px 0 0}.light-controls{display:grid;gap:21px;margin:0 0 25px}.light-controls .reading-control-heading{margin-bottom:10px}.light-controls label{font-size:11px}.light-controls output{font-size:20px}.light-controls details{border:1px solid #35412d;border-radius:6px;padding:13px}.light-controls summary{cursor:pointer;font-size:11px;color:#d6c7ac}.light-controls details>div{display:grid;gap:21px;margin-top:22px}.light-presets{display:flex;gap:6px;margin-bottom:23px}.light-presets button{flex:1;font-size:10px;line-height:1.4;padding:11px 6px;border-radius:5px;background:#242a20;border:1px solid #3c4732;color:#abb89c}.light-presets button[aria-pressed="true"]{background:#d9c3a4;border-color:#d9c3a4;color:#24291d}.light-presets button:hover{border-color:#b9bf9e}.light-explanation .composition-field p{font-size:11px}.light-reference{margin-top:48px;border-top:1px solid var(--line);padding-top:33px}.light-reference h2{font-size:34px;font-weight:450;letter-spacing:-1px;margin:17px 0 30px}.light-reference h2 span{color:#a6b093}.light-reference-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}.light-reference-grid article{border-top:1px solid #3c4136;padding-top:19px}.light-reference-grid article>span{font-size:8px;letter-spacing:1.3px;color:#a78f71}.light-reference-grid h3{font-size:16px;font-weight:450;line-height:1.5;letter-spacing:-.2px;margin:17px 0 10px}.light-reference-grid p{font-size:12px;line-height:1.85;color:#9ca78f;margin:0}.light-quiz{border-top:1px solid var(--line);margin-top:40px}
@media(min-width:801px){.light-visual{position:sticky;top:15px;align-self:start}.light-lab{overflow:clip;overflow-clip-margin:0}}
@media(max-width:1150px){.light-lab{grid-template-columns:minmax(0,1.4fr) minmax(315px,1fr)}.light-explanation{padding:22px}.light-explanation h2{font-size:25px}.light-lessons button{font-size:10px;padding:11px 9px}.light-instruments{padding:18px;gap:15px}.light-source-toggles button{padding:13px 10px;gap:7px;font-size:10px}.light-readout dd{font-size:12px}.light-readout dt{font-size:9px}.light-plan-title{font-size:7px}.light-plan-title span{display:none}.light-scene-heading>span{font-size:7px}}
@media(max-width:800px){.header .course-tabs{gap:12px;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}.header .course-tabs a{font-size:11px}.light-intro h1{font-size:37px}.light-intro h1 em{display:block;margin-top:5px}.light-lessons{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:17px}.light-lessons button{font-size:10px;padding:10px 7px;gap:6px}.light-lab{grid-template-columns:1fr;overflow:visible}.light-visual{border-right:0;border-bottom:1px solid var(--line);border-radius:12px 12px 0 0;overflow:hidden}.light-scene-heading{top:13px;left:13px;right:13px}.light-view-switch button{font-size:8px;padding:5px 6px}.light-scene-heading>span{font-size:6px;letter-spacing:.7px;padding:6px}.light-scene-caption{left:18px;bottom:16px}.light-scene-caption>span{font-size:12px}.light-scene-caption small{font-size:8px}.light-source-toggles button{padding:13px 9px;font-size:10px;gap:7px}.light-source-toggles b{height:21px;width:21px}.light-instruments{grid-template-columns:1fr 1fr;padding:18px 15px;gap:17px}.light-plan-help{font-size:8px}.light-readout dl>div{display:block;padding:9px 0}.light-readout dd{font-size:14px;margin-top:4px}.light-readout dt{font-size:9px}.light-readout>p{font-size:10px;margin-top:12px}.light-readout .light-ratio-note{font-size:8px}.light-plan{margin-top:17px}.light-explanation{padding:24px}.light-explanation h2{font-size:28px}.light-explanation .composition-body{font-size:13px}.light-explanation .composition-lead{font-size:14px}.light-exercise p{font-size:12px}.light-controls label{font-size:12px}.light-controls output{font-size:22px}.light-controls .range-ends{font-size:9px}.light-presets button{font-size:11px}.light-explanation .composition-field p{font-size:12px}.light-reference{margin-top:35px;padding-top:28px}.light-reference h2{font-size:29px}.light-reference-grid{grid-template-columns:1fr 1fr;gap:25px 20px}.light-quiz{margin-top:30px}.light-plan-title{letter-spacing:.6px}.light-view-switch{flex-shrink:0}}
@media(max-width:400px){.header .course-tabs{gap:14px}.header .course-tabs a{font-size:10px}.light-reference-grid{grid-template-columns:1fr}}
@media(max-width:800px) and (min-height:650px){.light-visual{display:contents}.light-viewport{position:sticky;top:0;z-index:4;height:min(28svh,240px);aspect-ratio:auto;border-radius:12px 12px 0 0;box-shadow:0 7px 20px #0005}.light-controls input,.light-presets,.light-controls summary{scroll-margin-top:calc(28svh + 28px)}}
.light-source-handle{position:absolute;transform:translate(-50%,-50%);border:1px solid #f2d1a4;border-radius:50%;width:29px;height:29px;padding:0;background:#dbc19b;color:#252c1c;font-size:12px;cursor:grab;touch-action:none}.light-source-handle[data-plan-source="fill"]{background:#9abaca;border-color:#cfecf6}.light-source-handle[data-plan-source="rim"]{background:#bba3ce;border-color:#e4cbf7}.light-source-handle.selected{box-shadow:0 0 0 5px #c6d6b41f}.light-source-handle:active{cursor:grabbing}

@media(max-width:800px){.light-lab{grid-template-columns:minmax(0,1fr)}.light-viewport,.light-source-toggles,.light-instruments{min-width:0}.light-source-toggles{grid-template-columns:repeat(3,minmax(0,1fr))}.light-source-toggles button,.light-source-toggles button>span{min-width:0}.light-instruments{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:360px){.light-source-toggles button{flex-direction:column;gap:6px;text-align:center}.light-source-toggles b{flex-shrink:0}.light-source-toggles i{margin-left:0}}