.cutaway-controls{padding:14px 0 0;animation:panel-in .2s ease}.cutaway-depth{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:#75757f}.cutaway-depth output{font-variant-numeric:tabular-nums}.cutaway-controls input{width:100%;height:22px;accent-color:#55555f;margin:5px 0 10px;cursor:pointer}.cutaway-axis{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#75757f;gap:7px}.cutaway-axis select{min-width:0;border:1px solid #dedee7;border-radius:6px;padding:5px 7px;background:#fff;color:#5e5e67;font:inherit}.cutaway-controls p{font-size:10px;line-height:1.8;color:#92929c;margin:10px 0 0}.inline-learning{border-top:1px solid #e7e7ed;padding-top:20px;scroll-margin-top:24px}.learning-topline{display:flex;justify-content:space-between;align-items:center;font-size:9px;letter-spacing:1.4px;color:#9595a0;margin-bottom:17px}.learning-topline>span:last-child{letter-spacing:0;font-size:11px;color:#777782}.learning-tabs{display:flex;gap:5px;border-bottom:1px solid #e5e5ed;margin-bottom:24px}.learning-tabs button{flex:1;display:flex;align-items:center;gap:7px;text-align:left;font-size:11px;white-space:nowrap;color:#93939e;padding:0 2px 13px;position:relative}.learning-tabs button>span{font-family:var(--sans);font-size:9px;border:1px solid #e1e1e8;display:grid;place-items:center;width:21px;height:21px;border-radius:50%;flex-shrink:0}.learning-tabs button[aria-selected=true]{color:#26262f}.learning-tabs button[aria-selected=true]::after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:2px;background:#34343d;border-radius:2px}.learning-tabs button[aria-selected=true]>span{background:#34343d;color:#fff;border-color:#34343d}.learning-tabs button.is-done:not([aria-selected=true])>span{color:#5f786c;background:#f1f5f2;border-color:#e3ebe5}.learning-page{animation:reading-in .25s ease}.learning-page:focus{outline:none}.learning-page h2{font-size:22px;font-weight:500;letter-spacing:-.6px;line-height:1.5;margin:0 0 15px}.learning-page p{font-size:13px;line-height:1.95;color:#797983;margin:0 0 18px}.learning-highlight{padding:17px 19px;background:#f6f6f8;border:1px solid #eeeef3;border-radius:11px;margin:20px 0}.learning-highlight>span{display:block;font-size:8px;color:#9595a0;letter-spacing:1.5px;margin-bottom:8px}.learning-highlight p{font-size:13px;color:#4d4d59;line-height:1.9;margin:0}.learning-objectives{list-style:none;padding:0;margin:20px 0}.learning-objectives li{display:flex;gap:10px;align-items:baseline;color:#83838f;font-size:12px;line-height:1.9;margin:8px 0}.learning-objectives li::before{content:'↗';font-size:12px;color:#a2a2ac}.learning-mini-title{font-size:11px;font-weight:500;color:#545460;margin-top:21px}.learning-source{font-size:10px;color:#9595a1;display:inline-flex;align-items:center;gap:7px;line-height:1.7;text-decoration:none;margin:3px 0 21px}.learning-source:hover{color:#41414b}.learning-actions{display:flex;gap:10px;align-items:center;padding:17px 0 0;border-top:1px solid #e8e8ee}.learning-back{display:grid;place-items:center;width:40px;height:40px;border-radius:9px;border:1px solid #e3e3eb;color:#797985;flex-shrink:0}.learning-back:disabled{opacity:.35;cursor:default}.learning-next{flex:1;display:flex;align-items:center;justify-content:space-between;gap:12px;background:#26262b;color:#fff;border-radius:9px;min-height:41px;padding:11px 16px;font-size:12px}.learning-next:hover{background:#424249}.learning-next:disabled{background:#eef2ef;color:#63776b}.learning-footnote{font-size:9px;color:#a5a5b0;margin:11px 0 0;text-align:center}.reading-structures{display:flex;flex-direction:column;gap:8px;margin:14px 0 22px}.reading-structure{display:flex;align-items:flex-start;gap:11px;text-align:left;width:100%;border:1px solid #e5e5ed;border-radius:10px;padding:13px;background:#fff;transition:background .2s,border-color .2s}.reading-structure>span{font-family:var(--sans);font-size:10px;color:#a1a1ac;padding-top:2px}.reading-structure>div{flex:1;min-width:0}.reading-structure strong{display:block;font-family:var(--sans);font-weight:500;font-size:13px;line-height:1.5}.reading-structure small{display:block;font-size:11px;color:#93939d;line-height:1.7}.reading-structure p{font-size:12px;margin:8px 0 0;line-height:1.8;color:#696975}.reading-structure>svg{width:14px;height:14px;color:#aaaab5;margin-top:3px;flex-shrink:0}.reading-structure[aria-pressed=true]{border-color:#92929f;background:#f9f9fb}.reading-recap{margin:15px 0 22px;padding:0;list-style:none;counter-reset:recap}.reading-recap li{counter-increment:recap;border-bottom:1px solid #eeeef3;padding:16px 0 16px 28px;position:relative;font-size:13px;color:#74747f;line-height:1.9}.reading-recap li::before{content:counter(recap,decimal-leading-zero);position:absolute;left:0;top:18px;font-size:9px;color:#aaaab5}.reading-complete{background:#f1f5f2;border-radius:9px;color:#66786d;font-size:12px;padding:13px 15px;line-height:1.8;margin-bottom:16px}.reading-quiz{display:flex;align-items:center;justify-content:space-between;width:100%;font-size:12px;color:#5f5f6b;padding:14px 0}.inline-learning button:focus-visible,.cutaway-controls input:focus-visible,.cutaway-controls select:focus-visible{outline:2px solid #9393a1;outline-offset:3px}.learning-empty{font-size:13px;color:#878792;line-height:1.9;padding:10px 0 24px}

/* One product stage, with a quiet reading column beside the interactive model. */
.explorer{position:sticky;top:20px}
.stage.learning-stage{display:grid;grid-template-columns:minmax(0,1fr) 300px;height:600px;background:#f6f6f8;border:1px solid #eeeef2;box-shadow:none}
.model-viewport{position:relative;min-width:0;min-height:0;overflow:hidden;isolation:isolate;background:radial-gradient(ellipse at 50% 43%,#fafafa,#f4f4f6 85%)}
.learning-stage .inline-learning{display:flex;flex-direction:column;min-width:0;min-height:0;height:100%;margin:0;padding:0;background:#fdfdfd;border:0;border-left:1px solid #e7e7ed;border-radius:0;scroll-margin-top:24px;position:relative;z-index:1;text-align:left}
.learning-header{flex-shrink:0;padding:23px 21px 0}.learning-topline{font-size:8px;letter-spacing:1.5px;gap:10px;margin-bottom:21px}.learning-topline>span:last-child{font-size:10px;white-space:nowrap;color:#92929d}
.learning-tabs{gap:7px;margin-bottom:0}.learning-tabs button{font-size:11px;gap:6px;padding:0 0 14px}.learning-tabs button>span{width:19px;height:19px;font-size:8px}
.learning-scroll{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:23px 21px 9px;scrollbar-width:thin;scrollbar-color:#d8d8e1 transparent;scroll-padding:12px}
.learning-page h2{font-size:21px;font-weight:500;letter-spacing:-.6px;line-height:1.5;margin:0 0 14px}.learning-page p{font-size:13px;line-height:1.95;color:#777782;margin:0 0 18px}.learning-highlight{padding:16px;background:#f5f5f7;border:1px solid #ececf1;border-radius:10px;margin:20px 0}.learning-highlight>span{font-size:7px;letter-spacing:1.4px;color:#9898a2;margin-bottom:9px}.learning-highlight p{font-size:12px;color:#565662;line-height:1.9;margin:0}.learning-mini-title{font-size:11px;font-weight:500;margin-top:21px}.learning-objectives{margin:13px 0 7px}.learning-objectives li{font-size:11px;gap:8px;line-height:1.85;margin:9px 0}.learning-source{font-size:10px;line-height:1.8;margin:15px 0 12px;gap:6px}.learning-source svg{width:12px;height:12px;flex-shrink:0}
.learning-footer{flex-shrink:0;padding:0 20px 16px;background:#fdfdfd}.learning-actions{padding-top:15px;gap:7px}.learning-back{width:35px;height:36px;border-radius:8px}.learning-next{min-height:36px;font-size:11px;padding:10px 12px;border-radius:8px}.learning-footnote{font-size:8px;color:#a2a2ae;margin-top:10px;text-align:center;line-height:1.6}
.reading-structures{display:flex;flex-direction:column;gap:8px;margin:15px 0 13px}.reading-structure{padding:12px;gap:9px;border-radius:9px}.reading-structure>span{font-size:9px}.reading-structure strong{font-size:12px}.reading-structure small{font-size:10px}.reading-structure p{font-size:12px;line-height:1.85;margin:8px 0 0}.reading-structure>svg{width:12px;height:12px}.reading-recap{display:block;margin:5px 0 20px}.reading-recap li{font-size:12px;line-height:1.9;padding:15px 0 15px 26px}.reading-recap li::before{top:18px}.reading-complete{font-size:11px;line-height:1.85;padding:12px}.reading-quiz{font-size:11px;gap:7px;flex-wrap:wrap;padding:13px 0}.learning-is-empty{padding:24px!important}.learning-empty{font-size:12px;line-height:1.95}
.learning-stage:fullscreen{width:100vw;height:100vh;grid-template-columns:minmax(0,1fr) 350px}.learning-stage:fullscreen .learning-page h2{font-size:24px}.learning-stage:fullscreen .learning-page p{font-size:14px}.learning-stage:fullscreen .learning-header{padding:30px 27px 0}.learning-stage:fullscreen .learning-scroll{padding:27px}.learning-stage:fullscreen .learning-footer{padding:0 27px 25px}
.cutaway-controls{margin-bottom:17px}
@keyframes reading-in{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1450px){.stage.learning-stage{height:640px;grid-template-columns:minmax(0,1fr) 320px}.learning-header{padding:25px 24px 0}.learning-scroll{padding:24px 24px 12px}.learning-footer{padding:0 24px 20px}}
@media(max-width:1120px){.explorer{position:static}.stage.learning-stage{height:auto;grid-template-columns:minmax(0,1fr);grid-template-rows:390px 480px}.learning-stage .inline-learning{border-left:0;border-top:1px solid #e7e7ed}.learning-header{padding:21px 23px 0}.learning-tabs{max-width:400px;gap:15px}.learning-scroll{padding:21px 23px 10px}.learning-footer{padding:0 23px 18px}.learning-page h2{font-size:22px}.learning-page p{font-size:13px}.learning-actions{justify-content:flex-end}.learning-next{flex:0 1 230px}.learning-footnote{text-align:right}.learning-stage:fullscreen{grid-template-columns:minmax(0,1fr) 300px;grid-template-rows:minmax(0,1fr);height:100vh}.learning-stage:fullscreen .inline-learning{border-top:0;border-left:1px solid #e7e7ed}}
@media(max-width:620px){.stage.learning-stage{grid-template-rows:350px 470px}.learning-header{padding:20px 18px 0}.learning-scroll{padding:20px 18px 10px}.learning-footer{padding:0 18px 17px}.learning-topline{font-size:8px}.learning-tabs{gap:10px}.learning-tabs button{font-size:12px}.learning-page h2{font-size:22px}.learning-page p{font-size:14px}.learning-highlight p{font-size:13px}.learning-objectives li{font-size:12px}.learning-next{font-size:12px;min-height:42px}.learning-back{height:42px;width:40px}.learning-footnote{font-size:9px}.learning-source{font-size:11px}.reading-structure strong{font-size:14px}.reading-structure small,.reading-structure p{font-size:12px}.reading-recap li{font-size:13px}.learning-stage:fullscreen{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(230px,45vh) minmax(0,1fr);overflow-y:auto}.learning-stage:fullscreen .inline-learning{border-left:0;border-top:1px solid #e7e7ed}.learning-stage:fullscreen .learning-header{padding:16px 18px 0}.learning-stage:fullscreen .learning-scroll{padding:17px 18px}.learning-stage:fullscreen .learning-footer{padding:0 18px 13px}.cutaway-controls p{font-size:11px}.cutaway-depth,.cutaway-axis{font-size:12px}}
@media(prefers-reduced-motion:reduce){.learning-page,.cutaway-controls{animation:none}.reading-structure{transition:none}}
.learning-header-tools{display:flex;align-items:center;gap:8px;margin-right:-6px;font-size:9px;letter-spacing:0;color:#92929d;white-space:nowrap}.learning-close{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;color:#8c8c98;font-size:20px}.learning-close svg{width:13px;height:13px}.learning-close:hover{background:#eeeef3;color:#363640}.stage-learning-toggle{display:flex;align-items:center;gap:6px;padding:6px 9px;border-radius:7px;border:1px solid #e4e4eb;background:#ffffffd9;color:#686875;font-size:10px}.stage-learning-toggle svg{width:13px;height:13px}.learning-stage.lesson-hidden{grid-template-columns:minmax(0,1fr)}.learning-stage .inline-learning[hidden]{display:none!important}.learning-topline{align-items:center}.learning-topline>span:first-child{font-size:8px}.stage-learning-toggle:focus-visible{outline:2px solid #92929f;outline-offset:3px}
@media(max-width:1120px){.stage.learning-stage.lesson-hidden{grid-template-rows:390px}.stage.learning-stage.lesson-hidden:fullscreen{grid-template-rows:minmax(0,1fr)}}
@media(max-width:620px){.stage.learning-stage.lesson-hidden{grid-template-rows:350px}.stage-learning-toggle{font-size:10px}.learning-close{height:30px;width:30px}.learning-header-tools{font-size:10px}}
/* Configurator choices: clear selection, restrained surfaces, one reading area. */
.learning-topline{margin-bottom:18px;letter-spacing:0}.learning-topline>span:first-child{font-size:18px;font-weight:500;letter-spacing:-.6px;color:#29292f}.learning-header-tools{font-size:9px;color:#9898a3;gap:5px}.learning-modes{display:flex;gap:3px;padding:3px;background:#f0f0f3;border-radius:9px;margin-bottom:16px}.learning-modes button{flex:1;padding:8px 5px;border-radius:7px;color:#9696a0;font-size:11px;line-height:1.6}.learning-modes button[aria-selected=true]{background:#fff;color:#34343c;box-shadow:0 1px 3px #1616240b}.learning-tabs{gap:7px;border:0;margin-bottom:0}.learning-tabs button{flex-direction:column;align-items:flex-start;justify-content:center;gap:5px;padding:10px 9px;border:1px solid #e1e1e8;border-radius:9px;font-size:11px;min-height:54px;color:#898994;background:#fdfdfd;white-space:normal;line-height:1.4}.learning-tabs button[aria-selected=true]{border-color:#36363f;box-shadow:inset 0 0 0 .35px #36363f;color:#27272e;background:white}.learning-tabs button[aria-selected=true]::after{display:none}.learning-tabs button>span,.learning-tabs button[aria-selected=true]>span,.learning-tabs button.is-done:not([aria-selected=true])>span{display:block;width:auto;height:auto;background:none;border:0;color:#a0a0aa;border-radius:0;font-size:8px;line-height:1}.learning-tabs button[aria-selected=true]>span{color:#777781}.learning-scroll{padding-top:22px}.learning-page h2{font-size:20px;margin-bottom:14px}.learning-highlight{background:#f6f6f8;border-color:#eeeef2;margin:20px 0;padding:17px}.learning-highlight p{color:#555561}.learning-next{font-weight:400;letter-spacing:0}.learning-footer{padding-top:1px}
.learning-stage .physiology-panel{margin:0;padding:0;border:0;background:none;border-radius:0}.learning-stage .physiology-heading{display:none}.learning-stage .physiology-intro{align-items:flex-start;gap:11px}.learning-stage .physiology-intro h3{font-size:20px;font-weight:500;letter-spacing:-.5px;line-height:1.5}.learning-stage .physiology-intro p{font-size:12px;line-height:1.9;margin-top:9px;color:#888893}.learning-stage .physiology-play{width:36px;height:36px;margin-top:2px}.learning-stage .physiology-controls{margin-top:22px;padding-top:19px}.learning-stage .physiology-phase>span:first-child{font-size:13px}.learning-stage .physiology-description{font-size:12px;min-height:80px;line-height:1.9;margin-bottom:15px}.learning-stage .physiology-timing,.learning-stage .physiology-note summary,.learning-stage .physiology-note a{font-size:10px}.learning-stage .physiology-note p{font-size:11px}.learning-stage .physiology-flow{font-size:11px}.learning-stage .physiology-flow>span{font-size:10px}.learning-stage .physiology-scrub label,.learning-stage .physiology-scrub output{font-size:10px}.learning-stage .physiology-note{margin-bottom:14px}
.learning-stage .stage-angles{position:absolute;left:50%;bottom:16px;top:auto;transform:translateX(-50%);z-index:4;margin:0;width:max-content;display:flex;gap:2px;border:1px solid #e6e6ec;background:#f8f8facf;backdrop-filter:blur(8px);padding:3px;border-radius:30px}.learning-stage .stage-angles button{padding:5px 12px;min-width:63px;font-size:9px;white-space:nowrap}.learning-stage .viewer-tools,.learning-stage:fullscreen .viewer-tools{bottom:55px;top:auto;left:50%;transform:translateX(-50%)}.learning-stage .stage-bottom{display:none}
@media(max-width:620px){.learning-topline>span:first-child{font-size:19px}.learning-modes button{font-size:12px}.learning-tabs button{font-size:12px;min-height:53px}.learning-stage .stage-angles button{font-size:10px;padding:5px 11px}.learning-page p{font-size:14px}.learning-stage .physiology-intro h3{font-size:21px}}

/* Keep the animation card visible alongside the reading material. */
.learning-physiology-preview{margin:0 0 24px;padding:14px;border:1px solid #e6e6ec;border-radius:12px;background:#fafafb}

.learning-physiology-preview .physiology-heading{display:flex;margin-bottom:11px}
.learning-physiology-preview .physiology-heading small{display:none}
.learning-physiology-preview .physiology-heading>span{font-size:10px;color:#85858f}
.learning-physiology-preview .physiology-intro h3{font-size:15px;letter-spacing:-.3px;line-height:1.6}
.learning-physiology-preview .physiology-intro p{font-size:11px;line-height:1.8;margin-top:5px}
.learning-physiology-preview .physiology-play{width:33px;height:33px;margin-top:4px}
.physiology-more{display:flex;align-items:center;justify-content:space-between;width:100%;padding:11px 0 0;margin-top:12px;border-top:1px solid #e8e8ed;font-size:10px;color:#73737e;text-align:left}
.physiology-more:hover{color:#24242b}
.reading-facts{margin:12px 0 24px}
.reading-facts>div{display:grid;grid-template-columns:58px minmax(0,1fr);gap:12px;padding:12px 0;border-bottom:1px solid #ececf1}
.reading-facts dt{font-size:11px;color:#90909b;line-height:1.9}
.reading-facts dd{margin:0;font-size:12px;line-height:1.9;color:#4f4f5c}
.reading-insight{margin:23px 0;padding-left:14px;border-left:2px solid #e2e2e9}
.reading-insight .learning-mini-title{margin:0 0 7px}
.reading-insight p{font-size:12px;margin:0}
/* Angle choices on the left, model tools on the right, in one row. */
.model-viewport{container-type:inline-size;container-name:model}
.model-control-dock{position:absolute;left:18px;right:18px;bottom:16px;display:flex;align-items:center;justify-content:space-between;gap:12px;z-index:4;pointer-events:none}
.learning-stage .model-control-dock .stage-angles,.learning-stage .model-control-dock .viewer-tools{position:static;transform:none;flex-shrink:0;pointer-events:auto;margin:0}
.learning-stage .model-control-dock .stage-angles{padding:3px}
.learning-stage .model-control-dock .stage-angles button{min-width:0;padding:7px 12px;font-size:9px}
.learning-stage .model-control-dock .viewer-tools{padding:4px 7px;gap:2px}
.learning-stage .model-control-dock .tool-button{width:29px;height:29px}
@container model (max-width:420px){
 .model-control-dock{left:12px;right:12px;gap:6px}
 .learning-stage .model-control-dock .stage-angles button{padding:7px 7px;font-size:9px}
 .learning-stage .model-control-dock .viewer-tools{padding:4px;gap:0}
 .learning-stage .model-control-dock .tool-button{width:27px;height:29px}
 .learning-stage .model-control-dock .viewer-tools>span{margin:0 2px}
}
@media(max-width:620px){.reading-facts dd{font-size:13px}.reading-facts dt{font-size:12px}.reading-insight p{font-size:13px}}

@container model (max-width:320px){.model-control-dock{left:8px;right:8px}.learning-stage .model-control-dock .stage-angles button{padding:7px 5px}}

/* Open and close the drawer by animating matching grid tracks. */
.stage.learning-stage{--learning-width:300px;grid-template-columns:minmax(0,1fr) var(--learning-width);transition:grid-template-columns .42s cubic-bezier(.22,.68,0,1),grid-template-rows .42s cubic-bezier(.22,.68,0,1)}
.stage.learning-stage.lesson-hidden{grid-template-columns:minmax(0,1fr) 0px}
.learning-stage .inline-learning{overflow:hidden;opacity:1;transform:translateX(0);visibility:visible;transition:opacity .24s ease,transform .42s cubic-bezier(.22,.68,0,1),visibility 0s linear 0s}
.learning-stage .inline-learning>.learning-header,.learning-stage .inline-learning>.learning-scroll,.learning-stage .inline-learning>.learning-footer{width:var(--learning-width);box-sizing:border-box;flex-shrink:0}
.learning-stage .inline-learning>.learning-scroll{flex-shrink:1}
.learning-stage.lesson-hidden .inline-learning{opacity:0;transform:translateX(16px);visibility:hidden;pointer-events:none;transition:opacity .18s ease,transform .42s cubic-bezier(.22,.68,0,1),visibility 0s linear .42s}
.learning-stage:fullscreen{--learning-width:350px;grid-template-columns:minmax(0,1fr) var(--learning-width)}
.learning-physiology-preview .physiology-controls{display:none!important}
.learning-stage .physiology-description{min-height:52px}
.details .learning-entry-arrow{transform:rotate(180deg)}
@media(min-width:1450px){.stage.learning-stage{--learning-width:320px}.stage.learning-stage:fullscreen{--learning-width:350px}}
@media(max-width:1120px){
 .stage.learning-stage,.stage.learning-stage.lesson-hidden{grid-template-columns:minmax(0,1fr);grid-template-rows:390px 480px}
 .stage.learning-stage.lesson-hidden{grid-template-rows:390px 0px}
 .learning-stage .inline-learning>.learning-header,.learning-stage .inline-learning>.learning-scroll,.learning-stage .inline-learning>.learning-footer{width:100%}
 .learning-stage.lesson-hidden .inline-learning{transform:translateY(12px)}
 .stage.learning-stage:fullscreen{--learning-width:300px;grid-template-columns:minmax(0,1fr) var(--learning-width);grid-template-rows:minmax(0,1fr)}
 .stage.learning-stage.lesson-hidden:fullscreen{grid-template-columns:minmax(0,1fr) 0px;grid-template-rows:minmax(0,1fr)}
 .learning-stage:fullscreen .inline-learning>.learning-header,.learning-stage:fullscreen .inline-learning>.learning-scroll,.learning-stage:fullscreen .inline-learning>.learning-footer{width:var(--learning-width)}
}
@media(max-width:620px){
 .stage.learning-stage{grid-template-rows:350px 470px}
 .stage.learning-stage.lesson-hidden{grid-template-rows:350px 0px}
 .stage.learning-stage:fullscreen,.stage.learning-stage.lesson-hidden:fullscreen{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(230px,45vh) minmax(0,1fr)}
 .stage.learning-stage.lesson-hidden:fullscreen{grid-template-rows:minmax(230px,45vh) minmax(0,0fr)}
 .learning-stage:fullscreen .inline-learning>.learning-header,.learning-stage:fullscreen .inline-learning>.learning-scroll,.learning-stage:fullscreen .inline-learning>.learning-footer{width:100%}
}
@media(prefers-reduced-motion:reduce){.stage.learning-stage,.learning-stage .inline-learning,.learning-stage.lesson-hidden .inline-learning{transition:none;transform:none}}
/* Group navigation with help on the right of the desktop header. */
@media(min-width:621px){.site-header nav{margin-left:auto}.site-header .header-end{margin-left:0}.site-header{column-gap:24px}}

.config-panel{position:relative}.config-panel .details-top{position:absolute;top:0;right:0}.config-panel .details-top .icon-button{position:static}.config-panel .organ-title{padding-right:34px;margin-top:0}

/* Bound scrolling paint to the reading area, beneath opaque header/footer. */
.learning-stage .learning-header{position:relative;z-index:2;background:#fdfdfd;padding-bottom:14px;border-bottom:1px solid #eeeef2}
.learning-stage .learning-scroll{position:relative;z-index:0;isolation:isolate;contain:paint;overflow-x:hidden;overflow-y:auto;padding-top:18px}
.learning-stage .learning-footer{position:relative;z-index:2;background:#fdfdfd}

.learning-stage .learning-header{--header-rule-inset:21px;border-bottom:0}
.learning-stage .learning-header::after{content:'';position:absolute;bottom:0;left:var(--header-rule-inset);right:var(--header-rule-inset);height:1px;background:#eeeef2}
@media(min-width:1450px){.learning-stage .learning-header{--header-rule-inset:24px}}
@media(max-width:1120px){.learning-stage .learning-header{--header-rule-inset:23px}}
.learning-stage:fullscreen .learning-header{--header-rule-inset:27px}
@media(max-width:620px){.learning-stage .learning-header,.learning-stage:fullscreen .learning-header{--header-rule-inset:18px}}

/* Mobile navigation: one header row, help followed by a menu button. */
.mobile-menu-toggle{display:none}
@media(max-width:620px){
 .site-header{position:relative;z-index:10;flex-wrap:nowrap;height:70px;min-height:70px;padding:0 20px;gap:8px}
 .site-header .header-end{margin-left:auto;gap:6px;flex-shrink:0}
 .site-header .mobile-menu-toggle{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%}
 .mobile-menu-toggle:hover{background:#f5f5f7}
 .menu-glyph{display:grid;gap:4px;width:18px}
 .menu-glyph i{display:block;width:18px;height:1.5px;background:currentColor;border-radius:2px;transition:transform .22s ease,opacity .18s ease}
 .is-menu-open .menu-glyph i:first-child{transform:translateY(5.5px) rotate(45deg)}
 .is-menu-open .menu-glyph i:nth-child(2){opacity:0}
 .is-menu-open .menu-glyph i:last-child{transform:translateY(-5.5px) rotate(-45deg)}
 .site-header nav{position:absolute;top:calc(100% - 1px);left:12px;right:12px;order:initial;flex-basis:auto;align-self:auto;display:flex;flex-direction:column;align-items:stretch;gap:2px;height:auto;max-height:0;margin:0;padding:0 10px;overflow:hidden;border:1px solid transparent;border-radius:14px;background:#fff;box-shadow:0 12px 32px #17171f0d;opacity:0;visibility:hidden;transform:translateY(-8px);pointer-events:none;transition:max-height .28s cubic-bezier(.22,.68,0,1),padding .28s ease,opacity .18s ease,transform .22s ease,visibility 0s linear .28s}
 .site-header.is-menu-open nav{max-height:260px;padding:8px 10px;border-color:#e8e8ed;opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;transition-delay:0s}
 .site-header nav .nav-link{width:100%;min-height:44px;padding:10px 12px;display:flex;align-items:center;justify-content:flex-start;text-align:left;font-size:13px;line-height:1.6;border-radius:8px}
 .site-header nav .nav-link.active{background:#f5f5f7}
 .mobile-menu-toggle:focus-visible{outline:2px solid #92929f;outline-offset:3px}
}
@media(prefers-reduced-motion:reduce){.site-header nav,.menu-glyph i{transition:none}}

/* A compact model and a comfortable, self-contained mobile reading workspace. */
.stage-learning-toggle:disabled{opacity:.5;cursor:wait}
@media(max-width:620px){
 .stage.learning-stage{--mobile-model-height:clamp(180px,28svh,260px);--mobile-reader-height:max(420px,calc(100svh - var(--mobile-model-height) - 24px));scroll-margin-top:12px}
 .stage.learning-stage:not(:fullscreen){grid-template-rows:var(--mobile-model-height) var(--mobile-reader-height)}
 .stage.learning-stage.lesson-hidden:not(:fullscreen){grid-template-rows:350px 0px}
 .learning-stage .learning-header{padding:14px 18px 12px;--header-rule-inset:18px}
 .learning-stage .learning-topline{gap:8px;min-height:44px;margin-bottom:8px}
 .learning-stage .learning-topline>span:first-child{font-size:20px;font-weight:600;line-height:1.5}
 .learning-stage .learning-header-tools{gap:6px;margin-right:-6px}
 .learning-stage .learning-header-tools>span{font-size:11px;padding:5px 9px;background:#f4f4f7;border-radius:20px;color:#777782}
 .learning-stage .learning-close{width:44px;height:44px;background:#f5f5f7;flex-shrink:0}
 .learning-stage .learning-close svg{width:16px;height:16px}
 .learning-stage .learning-modes{margin-bottom:10px;border-radius:11px}
 .learning-stage .learning-modes button{min-height:44px;font-size:13px;border-radius:8px;padding:9px 6px}
 .learning-stage .learning-tabs{gap:7px;max-width:none}
 .learning-stage .learning-tabs button{min-height:44px;flex-direction:row;align-items:center;justify-content:center;gap:6px;padding:9px 6px;border-radius:9px;font-size:12px}
 .learning-stage .learning-tabs button>span{display:grid;place-items:center;width:18px;height:18px;flex-shrink:0;border-radius:50%;font-size:9px;background:#f1f1f4;color:#7d7d88}
 .learning-stage .learning-tabs button[aria-selected=true]>span{background:#303038;color:#fff}
 .learning-stage .learning-scroll{padding:20px 18px 12px;scroll-padding:20px;scrollbar-gutter:stable}
 .learning-stage .learning-page h2{font-size:22px;line-height:1.5;letter-spacing:-.5px}
 .learning-stage .learning-page p{font-size:14px;line-height:1.95;color:#686873}
 .learning-stage .learning-mini-title{font-size:13px}
 .learning-stage .learning-objectives li{font-size:13px;line-height:1.9}
 .learning-stage .reading-facts>div{grid-template-columns:64px minmax(0,1fr);padding:13px 0}
 .learning-stage .reading-facts dd{font-size:14px}
 .learning-stage .reading-structure{min-height:70px;padding:14px;gap:12px;border-radius:12px}
 .learning-stage .reading-structure strong{font-size:15px}
 .learning-stage .reading-structure small{font-size:13px}
 .learning-stage .reading-structure p{font-size:14px;margin-top:9px}
 .learning-stage .reading-recap li{font-size:14px;line-height:1.9}
 .learning-stage .learning-source{min-height:44px;font-size:12px}
 .learning-stage .reading-quiz{min-height:48px;font-size:14px}
 .learning-stage .learning-footer{padding:0 18px max(12px,env(safe-area-inset-bottom));box-shadow:0 -8px 16px #fdfdfd80}
 .learning-stage .learning-actions{padding-top:12px;gap:10px}
 .learning-stage .learning-back{width:48px;height:48px;border-radius:11px;font-size:18px}
 .learning-stage .learning-next{flex:1;min-height:48px;padding:12px 16px;border-radius:11px;font-size:13px}
 .learning-stage .learning-footnote{font-size:10px;line-height:1.6;text-align:center;margin-top:8px}
 .learning-stage .learning-physiology-preview{padding:12px 14px;border-radius:14px;margin-bottom:20px}
 .learning-stage .learning-physiology-preview .physiology-heading,.learning-stage .learning-physiology-preview .physiology-intro p{display:none}
 .learning-stage .inline-learning[data-reading-step="1"] .learning-physiology-preview,.learning-stage .inline-learning[data-reading-step="2"] .learning-physiology-preview{display:none}
 .learning-stage .reading-step-1>.learning-highlight{display:none}
 .learning-stage .physiology-play{width:44px;height:44px;margin-top:0}
 .learning-stage .physiology-intro h3{font-size:21px}
 .learning-stage .physiology-intro p{font-size:13px;color:#7a7a85}
 .learning-stage .learning-physiology-preview .physiology-intro h3{font-size:17px}
 .learning-stage .learning-physiology-preview .physiology-intro p{font-size:12px}
 .learning-stage .physiology-more{min-height:44px;font-size:12px;padding-top:6px;margin-top:6px}
 .learning-stage .physiology-phase>span:first-child{font-size:14px}
 .learning-stage .physiology-description{font-size:14px;min-height:0;line-height:1.9}
 .learning-stage .physiology-steps button{min-height:60px;padding:10px 8px;font-size:11px;border-radius:10px}
 .learning-stage .physiology-scrub label,.learning-stage .physiology-scrub output{font-size:12px}
 .learning-stage .physiology-scrub input{height:44px}
 .learning-stage .physiology-options{gap:7px;flex-wrap:wrap}
 .learning-stage .physiology-options label{font-size:12px}
 .learning-stage .physiology-options select,.learning-stage .physiology-clip-label select{min-height:44px;font-size:13px;border-radius:9px}
 .learning-stage .physiology-options button{width:44px;height:44px;border-radius:9px}
 .learning-stage .physiology-flow{min-height:44px;font-size:12px}
 .learning-stage .physiology-flow input{width:18px;height:18px}
 .learning-stage .physiology-flow>span{font-size:11px;padding-left:24px}
 .learning-stage .physiology-note summary{min-height:44px;padding:12px 0;font-size:12px;box-sizing:border-box}
 .learning-stage .physiology-note p{font-size:13px}
}
@media(max-width:620px) and (max-height:740px){
 .stage.learning-stage{--mobile-model-height:180px}
 .learning-stage .learning-header{padding-top:8px;padding-bottom:8px}
 .learning-stage .learning-topline{margin-bottom:4px}
 .learning-stage .learning-modes{margin-bottom:6px}
}
@media(max-width:360px){
 .learning-stage .learning-header{padding-left:16px;padding-right:16px;--header-rule-inset:16px}
 .learning-stage .learning-topline>span:first-child{font-size:18px}
 .learning-stage .learning-header-tools>span{padding:4px 7px;font-size:10px}
 .learning-stage .learning-tabs button>span{display:none}
 .learning-stage .learning-scroll,.learning-stage .learning-footer{padding-left:16px;padding-right:16px}
}