:root{--brand:#22a9f8;--deep:#01017c;--soft:#edf8ff;--line:#dce7ee;--muted:#52677b;--ink:#162e44;--white:#fff;--font:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--radius:24px;--glow:rgba(34,169,248,.15)}
*{box-sizing:border-box}body{margin:0;background:var(--white);font-family:var(--font);color:var(--ink);line-height:1.5}.iris-atlas{max-width:1160px;padding:36px 36px 24px;margin:auto}.eyebrow{display:flex;align-items:center;gap:10px;font-size:10px;font-weight:750;letter-spacing:2.3px;color:var(--muted);margin:0 0 17px}.eyebrow>span{width:7px;height:7px;background:var(--brand);border-radius:50%;box-shadow:0 0 0 4px var(--soft)}h1{font-size:clamp(27px,3.8vw,44px);line-height:1.13;font-weight:730;letter-spacing:-1.65px;color:var(--deep);margin:0}h1>span{font-weight:440}.intro-copy{max-width:650px;margin:16px 0 28px;font-size:14px;color:var(--muted);line-height:1.7}.exploration{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:36px;align-items:center}.exploration>*{min-width:0}.specimen{margin:0;align-self:stretch;display:flex;flex-direction:column;justify-content:center;background:radial-gradient(ellipse at center,var(--white) 35%,var(--soft) 100%);border-radius:var(--radius);padding:19px 17px 16px;border:1px solid var(--line)}.specimen-label{display:flex;justify-content:space-between;gap:14px;font-size:8px;letter-spacing:1.2px;color:var(--muted);font-weight:650}.specimen-label>span:last-child{letter-spacing:0;font-weight:450}.iris-plate{position:relative;margin:0 auto;width:100%;max-width:520px}.iris-plate>svg{display:block;width:100%;height:auto;filter:drop-shadow(0 9px 20px var(--glow))}.hotspot{position:absolute;width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:transparent;color:var(--deep);border:0;border-radius:50%;cursor:pointer;padding:0;transform:translate(-50%,-50%)}.hotspot>span{display:flex;align-items:center;justify-content:center;width:27px;height:27px;border-radius:50%;background:var(--white);border:1px solid var(--deep);font-size:12px;font-weight:750;box-shadow:0 2px 8px rgba(1,1,124,.14)}.hotspot[aria-pressed=true]>span{background:var(--deep);border-color:white;color:white;box-shadow:0 0 0 4px rgba(34,169,248,.27)}.hotspot-sphincter{top:56%;left:57%}.hotspot-dilator{top:28%;left:69%}.specimen>figcaption{font-size:10px;color:var(--muted);line-height:1.6;text-align:center}.overlay-key{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--brand);margin-right:4px}.readout-index{display:flex;gap:12px;align-items:center;font-size:8px;letter-spacing:1.3px;color:var(--muted);font-weight:650}.readout-index>span:first-child{font-size:15px;font-weight:750;color:var(--brand);letter-spacing:0}.readout-rule{width:30px;height:1px;background:var(--line)}.muscle-select{display:flex;gap:16px;margin:17px 0 24px;border-bottom:1px solid var(--line)}.muscle-select>button{font:600 12px var(--font);color:var(--muted);padding:10px 0 11px;min-height:44px;background:none;border:0;border-bottom:2px solid transparent;display:flex;align-items:center;gap:8px;cursor:pointer;position:relative;bottom:-1px}.muscle-select>button[aria-pressed=true]{color:var(--deep);border-bottom-color:var(--brand)}.ring-icon{width:14px;height:14px;border-radius:50%;border:3px solid currentColor}.rays-icon{font-size:21px;line-height:1}h2{font-size:clamp(25px,3vw,33px);line-height:1.15;color:var(--deep);font-weight:690;letter-spacing:-1px;margin:0 0 15px}h2 em{font-style:normal;font-weight:430}.selected-muscle>p{font-size:13px;line-height:1.75;color:var(--muted);margin:0}.selected-muscle{min-height:205px}.selected-muscle>.location{font-size:11px;margin-top:16px;display:flex;gap:8px;align-items:center}.location>span{color:var(--brand);font-size:20px;line-height:1}.action-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:13px}.action-button{display:flex;align-items:center;justify-content:center;gap:7px;font:600 11px var(--font);min-height:46px;padding:10px 8px;border:1px solid var(--line);color:var(--deep);background:var(--white);border-radius:11px;cursor:pointer}.action-button[aria-pressed=true]{background:var(--deep);color:var(--white);border-color:var(--deep)}.action-button svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.7;flex:none}.overlay-control{display:flex;align-items:center;gap:9px;font-size:10px;color:var(--muted);min-height:44px;cursor:pointer;margin-top:9px}.overlay-control input{accent-color:var(--deep);width:17px;height:17px;margin:0;cursor:pointer}.animation-note{font-size:10px;color:var(--muted);margin:0}.where{margin:27px 0 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.where summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:22px;font-size:12px;line-height:1.6;color:var(--deep);font-weight:650;min-height:63px;cursor:pointer;padding:16px 0}.where summary::-webkit-details-marker{display:none}.where summary>span{font-size:20px;font-weight:400;color:var(--brand)}.where[open] summary>span{transform:rotate(45deg)}.section-view{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:25px;align-items:center;padding:0 0 18px}.section-view>*{min-width:0}.cutaway>svg{width:100%;height:auto;display:block}dl{margin:0}dl>div{padding:13px 0;border-bottom:1px solid var(--line)}dl>div:last-child{border:0}dt{display:flex;gap:8px;font-size:13px;font-weight:700;color:var(--deep)}dt>span{font-size:9px;color:var(--brand);padding-top:3px}dd{font-size:11px;color:var(--muted);line-height:1.6;margin:4px 0 0 23px}.essential-guide{display:flex;gap:24px;margin:23px 0 0}.essential-guide>p{margin:0;display:flex;gap:9px;font-size:10px;line-height:1.7;color:var(--muted)}.essential-guide b{color:var(--brand)}.essential-guide strong{color:var(--deep);font-weight:650}footer{margin-top:20px;display:flex;gap:28px;align-items:flex-start;justify-content:space-between;color:var(--muted)}footer>p{max-width:740px;font-size:9px;line-height:1.7;margin:0}footer>span{font-size:8px;letter-spacing:1px;font-weight:700;white-space:nowrap;padding-top:4px;color:var(--deep)}footer b{color:var(--brand);padding:0 3px}.static-figure{margin:0}.static-figure img{display:block;max-width:100%;height:auto;margin:auto}.static-figure>figcaption{font-size:12px;color:var(--muted)}button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--brand);outline-offset:4px}
@media(max-width:680px){.iris-atlas{padding:25px 16px 22px}h1{font-size:29px;letter-spacing:-1.05px}.eyebrow{font-size:8px;letter-spacing:1.8px}.intro-copy{font-size:13px;margin:15px 0 23px}.exploration{grid-template-columns:minmax(0,1fr);gap:24px}.specimen{padding:17px 12px 19px}.specimen-label{font-size:7px;letter-spacing:.9px}.specimen>figcaption{font-size:9px;max-width:255px;margin:auto}.iris-plate{max-width:425px}.readout{padding:0 3px}.readout-index{font-size:8px}.muscle-select{margin:12px 0 19px;gap:21px}.muscle-select>button{font-size:13px}.selected-muscle{min-height:195px}h2{font-size:29px;letter-spacing:-.8px;margin-bottom:13px}.selected-muscle>p{font-size:13px}.selected-muscle>.location{font-size:12px;margin-top:13px}.action-buttons{margin-top:4px}.action-button{font-size:12px;min-height:48px}.overlay-control{font-size:11px;margin-top:11px}.animation-note{font-size:10px;line-height:1.6}.where{margin-top:23px}.where summary{font-size:12px;min-height:72px}.section-view{grid-template-columns:minmax(0,1fr);gap:0}.cutaway{max-width:340px;margin:auto}dl{display:grid;grid-template-columns:minmax(0,1fr);padding:0 5px}dt{font-size:13px}dd{font-size:12px}.essential-guide{display:block;margin-top:20px}.essential-guide>p{font-size:11px;margin-bottom:7px}footer{display:block;margin-top:17px}footer>p{font-size:9px}footer>span{display:block;margin-top:13px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}