:root{--navy:#01017c;--cyan:#22a9f8;--ink:#16274b;--muted:#52677b;--line:#dae8f2;--soft:#f0f8ff;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:#fff}button,input{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:4px}button,a,input{-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}.macula-atlas{max-width:1120px;margin:auto;padding:27px}.intro{display:flex;justify-content:space-between;align-items:start;gap:20px;margin-bottom:26px}.intro>div{min-width:0}.intro a{line-height:0;flex:none}.intro img{object-fit:contain}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--muted);font-weight:700;margin:0 0 11px}.intro .eyebrow{color:var(--navy);display:flex;align-items:center;gap:9px}.intro .eyebrow>span{width:7px;height:7px;background:var(--cyan);border-radius:50%;box-shadow:0 0 0 4px #22a9f818}.intro h1{font-size:clamp(27px,3vw,42px);line-height:1.08;letter-spacing:-.05em;color:var(--navy);font-weight:650;margin:0 0 15px}.intro h1>span{color:#088fda}.intro>div>p:last-child{font-size:14px;line-height:1.6;color:var(--muted);margin:0;max-width:60ch}.zoom-lab{border:1px solid var(--line);border-radius:21px;box-shadow:0 16px 50px #01017c06;background:#fff}.zoom-steps{display:flex;gap:6px;align-items:center;justify-content:center;border-bottom:1px solid var(--line);padding:16px 10px}.zoom-steps button{border:0;border-radius:23px;background:none;padding:10px 17px;color:var(--muted);font-size:13px;font-weight:600;display:flex;align-items:center;gap:8px;min-height:44px;transition:background .2s,color .2s}.zoom-steps button[aria-pressed=true]{background:var(--navy);color:#fff;box-shadow:0 3px 12px #01017c21}.step-symbol{font-size:21px;line-height:1;font-weight:350}.step-link{color:#97b4cd;font-size:12px}.zoom-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr)}.zoom-layout>*{min-width:0}.visual-stage{position:relative;background:radial-gradient(ellipse at 50% 48%,#13285b,#040e2e 75%);border-radius:0;aspect-ratio:1/1.04;isolation:isolate;display:flex;flex-direction:column;justify-content:center;padding:50px 20px 69px;min-height:520px}.visual-stage[data-state=eye],.visual-stage[data-state=fovea]{background:#f7fbff}.stage-meta{position:absolute;top:19px;left:19px;right:19px;display:flex;justify-content:space-between;align-items:center;gap:9px;color:#c0dbf5;font-size:8px;letter-spacing:.08em;font-weight:600;z-index:4}.visual-stage[data-state=eye] .stage-meta,.visual-stage[data-state=fovea] .stage-meta{color:var(--muted)}.stage-view{position:relative;width:100%;min-width:0}.eye-view img{display:block;width:100%;height:auto;border-radius:10px;mix-blend-mode:multiply}.eye-target{position:absolute;left:53%;top:16%;display:flex;align-items:center;gap:6px;font-size:12px;color:var(--navy);font-weight:650;border:1px solid #99d7fa;background:#fffffff5;border-radius:20px;padding:9px 12px;min-height:44px}.eye-target>span:first-child{width:7px;height:7px;background:var(--cyan);border-radius:50%;box-shadow:0 0 0 5px #22a9f820}.eye-target::after{content:"";position:absolute;height:40px;width:1px;background:var(--cyan);top:100%;left:17px}.fundus-view{aspect-ratio:1;max-width:500px;width:95%;margin:auto;overflow:hidden;border-radius:50%;box-shadow:0 0 0 1px #ffffff25,0 0 0 13px #ffffff03,0 0 75px #22a9f812}.fundus-transform{width:100%;height:100%;position:relative;transform-origin:48% 51%;transition:transform .7s cubic-bezier(.2,.7,.25,1)}.fundus-transform>img{width:100%;height:100%;display:block;object-fit:contain}.fundus-transform>svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;font-family:system-ui,sans-serif}.macula-ring{fill:#22a9f80a;stroke:#87dbff;stroke-width:3;stroke-dasharray:8 9}.fovea-ring{fill:#ffffff0a;stroke:white;stroke-width:2}.disc-line,.macula-line{fill:none;stroke:#fff;stroke-width:1.7}.disc-dot{fill:#fff;stroke:#01017c;stroke-width:2}.disc-label,.macula-label{fill:white;paint-order:stroke;stroke:#35262a;stroke-width:3;stroke-linejoin:round;font-weight:600}.photo-target{position:absolute;border:0;background:transparent;padding:0;min-width:44px;min-height:44px;border-radius:50%;display:grid;place-items:center}.photo-target>span{width:12px;height:12px;border:2px solid white;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 6px #22a9f835,0 0 16px #22a9f870}.macula-target{left:calc(25% - 22px);top:calc(68% - 22px);width:44px;height:44px}.fovea-target{left:calc(48% - 22px);top:calc(51% - 22px);width:44px;height:44px}.fovea-target>span{width:7px;height:7px;background:white;box-shadow:0 0 0 5px #ffffff20}.visual-stage[data-state=macula] .fundus-transform{transform:scale(1.8)}.visual-stage[data-state=macula] .disc-line,.visual-stage[data-state=macula] .disc-label,.visual-stage[data-state=macula] .macula-line,.visual-stage[data-state=macula] .macula-label{opacity:0}.visual-stage[data-state=macula] .macula-target{display:none}.fovea-view svg{display:block;width:100%;height:auto}.stage-caption{position:absolute;bottom:20px;left:20px;right:20px;color:#d1e3fa;font-size:11px;line-height:1.5;max-width:58ch;padding-right:68px}.visual-stage[data-state=eye] .stage-caption,.visual-stage[data-state=fovea] .stage-caption{color:var(--muted)}.back-button{position:absolute;bottom:22px;right:17px;display:flex;gap:4px;align-items:center;border:1px solid #ffffff35;color:#fff;background:#ffffff08;border-radius:16px;min-height:34px;padding:6px 9px;font-size:10px}.visual-stage[data-state=eye] .back-button,.visual-stage[data-state=fovea] .back-button{color:var(--navy);border-color:var(--line);background:#fff}.back-button:disabled{opacity:.4;cursor:default}.location-panel{padding:28px 25px 22px;display:flex;flex-direction:column}.location-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:16px}.location-heading>span:first-child{font-size:28px;color:var(--navy);font-weight:350}.location-heading small{font-size:12px;color:var(--muted)}.location-heading .eyebrow{font-size:8px;letter-spacing:.1em;margin:0;text-align:right}.location-panel h2{font-size:39px;line-height:1.1;letter-spacing:-.05em;color:var(--navy);margin:0 0 16px;font-weight:600}.location-function{font-size:16px;line-height:1.6;color:var(--ink);margin:0 0 23px;min-height:100px}.location-note{padding-top:18px;border-top:1px solid var(--line);margin-bottom:22px;font-size:12px;line-height:1.65;color:var(--muted);min-height:125px}.location-note strong{font-size:13px;line-height:1.5;display:block;margin-bottom:7px;color:var(--navy);font-weight:650}.location-note p{margin:0}.mini-map{display:flex;align-items:center;gap:13px;position:relative;color:var(--muted);font-size:10px;line-height:1.6;margin-bottom:21px}.mini-map img{width:59px;height:59px;border-radius:50%}.mini-ring{position:absolute;left:20px;top:21px;width:15px;height:15px;border:1px solid #8cddff;border-radius:50%}.zoom-control{margin-top:auto;display:grid;grid-template-columns:minmax(0,1fr) 70px;gap:10px 12px;align-items:center}.zoom-control>*{min-width:0}.zoom-control label{grid-column:1/-1;font-size:11px;font-weight:650;color:var(--navy)}.zoom-control input{width:100%;accent-color:var(--cyan);height:22px;margin:0}.zoom-control>span{font-size:11px;color:var(--navy);text-align:right;font-weight:600}.interaction-help{font-size:10px;line-height:1.6;color:var(--muted);margin:10px 0 0}.source-line{border-top:1px solid var(--line);padding:13px 19px;margin:0;color:var(--muted);font-size:9px;line-height:1.7}.source-line a{color:inherit;text-underline-offset:2px}.detail-lab{margin-top:32px}.section-heading h2{font-size:27px;color:var(--navy);letter-spacing:-.04em;font-weight:600;line-height:1.15;margin:0 0 11px}.section-heading>p:last-child{font-size:13px;color:var(--muted);line-height:1.6;margin:0;max-width:65ch}.example-tabs{display:flex;gap:7px;flex-wrap:wrap;margin:20px 0 18px}.example-tabs button{min-height:42px;border:1px solid var(--line);border-radius:20px;background:white;color:var(--muted);padding:9px 14px;font-size:12px;transition:background .2s,color .2s}.example-tabs button[aria-pressed=true]{background:var(--soft);color:var(--navy);border-color:#9dd7fa}.example-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:center;border:1px solid var(--line);padding:20px;border-radius:18px;background:linear-gradient(120deg,#f9fcff,#fff)}.example-layout>*{min-width:0}.example-layout>svg{width:100%;height:auto;max-width:410px;margin:auto;display:block}.example-tag{font-size:8px;letter-spacing:.12em;color:var(--muted);font-weight:700}.example-copy h3{font-size:23px;line-height:1.15;color:var(--navy);font-weight:600;letter-spacing:-.03em;margin:13px 0 14px}.example-copy p{font-size:13px;line-height:1.65;color:var(--muted);margin:0 0 15px}.example-copy .example-limit{font-size:11px;border-top:1px solid var(--line);padding-top:13px}.example-copy a{font-size:11px;color:var(--navy);font-weight:650;text-underline-offset:3px}.text-guide{margin-top:22px;border-bottom:1px solid var(--line)}.text-guide>summary{display:flex;justify-content:space-between;align-items:center;cursor:pointer;padding:16px 0;color:var(--navy);font-size:12px;font-weight:650;list-style:none}.text-guide>summary::-webkit-details-marker{display:none}.text-guide>summary>span{font-size:22px;color:var(--cyan);font-weight:350}.text-guide[open]>summary>span{transform:rotate(45deg)}.text-guide dl{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px 28px;margin:5px 0 25px}.text-guide dl>*{min-width:0}.text-guide dt{font-size:13px;color:var(--navy);font-weight:650;margin-bottom:7px}.text-guide dd{font-size:12px;color:var(--muted);line-height:1.6;margin:0}.macula-atlas footer{display:flex;justify-content:space-between;gap:15px;padding:16px 0 0;font-size:9px;line-height:1.6;color:var(--muted)}.macula-atlas footer>span{font-size:8px;letter-spacing:.1em}.macula-atlas footer a{color:var(--navy);text-underline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.static-map{display:block;width:100%;height:auto}.nojs-note{font-size:12px;padding:10px 20px;color:var(--muted)}.example-copy.is-changing{animation:copy-reveal .22s ease-out}@keyframes copy-reveal{from{opacity:.3;transform:translateY(3px)}to{opacity:1;transform:none}}.no-js .zoom-steps,.no-js .zoom-control,.no-js .interaction-help{display:none}
@media(max-width:700px){.macula-atlas{padding:19px 12px}.intro{gap:7px;margin-bottom:22px}.intro h1{font-size:30px;line-height:1.11;letter-spacing:-.05em}.intro>div>p:last-child{font-size:12px}.intro img{width:41px;height:34px}.intro .eyebrow{font-size:7.5px;letter-spacing:.1em;gap:7px}.zoom-lab{border-radius:17px}.zoom-steps{padding:10px 5px;gap:1px;justify-content:space-around}.zoom-steps button{font-size:10px;padding:8px 9px;gap:4px;min-height:44px}.step-symbol{font-size:16px}.step-link{font-size:9px}.zoom-layout{grid-template-columns:minmax(0,1fr)}.visual-stage{min-height:355px;aspect-ratio:1/1.15;padding:49px 10px 62px}.stage-meta{top:16px;left:13px;right:13px;font-size:6.5px;letter-spacing:.04em;gap:6px}.fundus-view{width:95%}.stage-caption{left:13px;bottom:15px;right:13px;font-size:9px;padding-right:57px;line-height:1.5}.back-button{bottom:16px;right:11px;font-size:8px;padding:5px 7px;min-height:32px}.eye-target{font-size:9px;padding:7px 10px;left:48%;min-height:37px}.eye-target::after{height:23px}.location-panel{padding:19px 18px 20px;display:grid;grid-template-columns:minmax(0,1fr) 72px;gap:0 12px}.location-panel>*{min-width:0}.location-heading{grid-column:1/-1;margin-bottom:12px}.location-heading>span:first-child{font-size:23px}.location-heading small{font-size:10px}.location-heading .eyebrow{font-size:7px;max-width:22ch}.location-panel h2{font-size:32px;grid-column:1;margin-bottom:12px}.location-function{grid-column:1/-1;font-size:14px;min-height:65px;margin-bottom:18px}.location-note{grid-column:1/-1;font-size:11px;min-height:108px;margin-bottom:17px;padding-top:15px}.location-note strong{font-size:12px}.mini-map{grid-row:2;grid-column:2;margin:0;align-self:start;justify-self:end}.mini-map>span:last-child{display:none}.mini-map img{width:52px;height:52px}.mini-ring{left:17px;top:18px;width:14px;height:14px}.zoom-control,.interaction-help{grid-column:1/-1}.zoom-control label{font-size:10px}.interaction-help{font-size:9px}.source-line{padding:12px 15px;font-size:8px;line-height:1.7}.detail-lab{margin-top:27px}.section-heading .eyebrow{font-size:8px}.section-heading h2{font-size:23px;line-height:1.17}.section-heading>p:last-child{font-size:12px}.example-tabs{gap:5px;margin:17px 0 14px}.example-tabs button{font-size:10px;padding:8px 10px;min-height:42px}.example-layout{grid-template-columns:minmax(0,1fr);gap:18px;padding:13px;border-radius:16px}.example-layout>svg{max-width:340px}.example-copy{padding:0 3px 4px}.example-copy h3{font-size:22px;max-width:22ch;margin-top:10px}.example-copy p{font-size:12px}.example-copy .example-limit{font-size:10px}.example-copy a{font-size:10px}.text-guide>summary{font-size:11px;gap:20px}.text-guide dl{grid-template-columns:minmax(0,1fr);gap:16px}.text-guide dd{font-size:11px}.macula-atlas footer{display:block;font-size:9px}.macula-atlas footer>span{display:block;margin-bottom:8px;font-size:7px}}
@media(max-width:340px){.intro h1{font-size:26px}.visual-stage{min-height:320px}.zoom-steps button{font-size:9px;padding:8px 7px;gap:3px}.step-symbol{font-size:14px}.stage-meta{font-size:6px}.example-tabs button{font-size:9px;padding:8px 9px}.location-function{font-size:13px}.location-panel{padding:17px 15px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.no-js .example-tabs,.no-js #example-scene,.no-js .eye-target,.no-js .photo-target,.no-js .back-button,.no-js #fovea-section { display:none; }

/* The photographic plane and the illustrated profile share a visible reference line. */
.section-cutline{opacity:0;fill:none;stroke:#8ee7ff;stroke-width:4;stroke-dasharray:300;stroke-dashoffset:0;filter:drop-shadow(0 0 5px #052b46)}.section-cutline .section-end{stroke-width:3;stroke-dasharray:none}.section-cutline text{fill:#fff;stroke:#251b20;stroke-width:2;paint-order:stroke;font-size:24px;font-weight:650;stroke-dasharray:none}
.section-orientation{position:absolute;top:45px;left:20px;right:20px;display:flex;justify-content:center;align-items:center;gap:10px;font-size:11px;color:var(--muted);z-index:4}.section-orientation strong{color:var(--navy);font-weight:650}.front-reference{position:relative;width:42px;height:42px;flex:none;overflow:hidden;border-radius:50%;border:1px solid #bed9ea}.front-reference img{width:100%;height:100%;object-fit:cover;transform:scale(1.8);transform-origin:48% 51%}.front-reference>span{position:absolute;top:51%;left:16%;right:16%;border-top:2px solid #9eeaff}.orientation-arrow{color:#048ed7;font-size:18px}.replay-section{position:absolute;left:20px;bottom:72px;min-height:44px;padding:8px 12px;color:var(--navy);font-size:10px;border:1px solid #c7e4f6;border-radius:24px;background:#fff;z-index:4}.replay-section:hover{background:var(--soft)}.visual-stage[data-state=fovea]{min-height:570px}.visual-stage[data-state=fovea] .fovea-view{margin:45px 0 40px}
.journey-label{position:absolute;top:49px;left:20px;right:20px;text-align:center;color:var(--navy);background:#fffffff2;border:1px solid #c8eaff;box-shadow:0 4px 20px #01017c0a;border-radius:20px;padding:9px 12px;font-size:12px;line-height:1.3;font-weight:650;z-index:5;pointer-events:none}.visual-stage[data-transition]{overflow:hidden;perspective:800px}.visual-stage[data-transition] .photo-target,.visual-stage[data-transition] .eye-target{pointer-events:none;opacity:0}.visual-stage[data-transition=section] .fovea-view{position:absolute;width:auto;inset:90px 20px 82px;display:flex;align-items:center;opacity:0;z-index:2;pointer-events:none;margin:0}.visual-stage[data-transition=section] .fundus-view{z-index:1;transform-origin:center}.visual-stage[data-transition=section][data-phase=turn]{background:#f7fbff}.visual-stage[data-transition=section][data-phase=turn] .stage-meta,.visual-stage[data-transition=section][data-phase=turn] .stage-caption{color:var(--muted)}.visual-stage[data-transition=section][data-phase=turn] .back-button{color:var(--navy);border-color:var(--line);background:#fff}.visual-stage[data-transition=eye] .eye-view{z-index:1;transform-origin:56% 30%}.visual-stage[data-transition=eye] .fundus-view{position:absolute;width:calc(95% - 38px);left:0;right:0;top:50%;translate:0 -50%;opacity:0;z-index:2}.visual-stage[data-transition=eye][data-phase=photo]{background:radial-gradient(ellipse at 50% 48%,#13285b,#040e2e 75%)}.visual-stage[data-transition=eye][data-phase=photo] .stage-meta,.visual-stage[data-transition=eye][data-phase=photo] .stage-caption{color:#d1e3fa}.visual-stage[data-transition=eye][data-phase=photo] .back-button{color:#fff;background:#ffffff08;border-color:#ffffff35}
@media(max-width:700px){.section-orientation{top:41px;left:13px;right:13px;gap:7px;font-size:9px}.front-reference{width:35px;height:35px}.orientation-arrow{font-size:15px}.visual-stage[data-state=fovea]{min-height:420px}.visual-stage[data-state=fovea] .fovea-view{margin:42px 0 38px}.replay-section{left:13px;bottom:65px;font-size:9px;padding:7px 11px}.journey-label{top:39px;left:13px;right:13px;font-size:10px;padding:8px 10px}.visual-stage[data-transition=section] .fovea-view{inset:85px 10px 76px}.visual-stage[data-transition=eye] .fundus-view{width:calc(95% - 19px)}}
.no-js .section-orientation,.no-js .journey-label,.no-js .replay-section{display:none}
.visual-stage{width:100%}.stage-caption,.back-button{z-index:4}.visual-stage[data-transition]::after{content:"";position:absolute;inset:auto 0 0;height:100px;background:linear-gradient(transparent,#071534 75%);pointer-events:none;z-index:3}.visual-stage[data-transition=eye]::after,.visual-stage[data-transition=section][data-phase=turn]::after{background:linear-gradient(transparent,#f7fbff 75%)}.visual-stage[data-transition=eye][data-phase=photo]::after{background:linear-gradient(transparent,#071534 75%)}.visual-stage[data-transition=eye] .stage-meta>span{background:#ffffffe8;border-radius:4px;padding:3px 5px;color:var(--muted)}
.visual-stage[data-transition=section][data-phase=turn] .section-cutline text{opacity:0}
@media(max-width:700px){.visual-stage[data-state=fovea]{min-height:calc(200px + 69.45vw)}}