:root{--accent:#b63b4c;--accent-hover:#982c40;--coral:#e75a64;--ink:#25272b;--secondary:#515a63;--surface:#fff;--warm:#f7f6f2;--subtle:#eff1f2;--line:#d8dcdf;--reading-scale:1;--rail:204px;--outline:224px;font-family:Inter,Arial,sans-serif;color:var(--ink);background:var(--warm);font-size:16px;line-height:1.55}
*{box-sizing:border-box}body{margin:0}button,select,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}button{color:inherit}button,select,input{min-width:0}a{color:var(--accent)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex="-1"]:focus-visible{outline:3px solid #175b91;outline-offset:3px}button{touch-action:manipulation}.icon{width:20px;height:20px;flex:none;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.app{height:100vh;height:100dvh;display:grid;grid-template-rows:80px minmax(0,1fr);overflow:hidden;background:var(--warm)}.skip{position:fixed;left:16px;top:-80px;z-index:100;background:white;padding:12px}.skip:focus{top:8px}.topbar{display:grid;grid-template-columns:minmax(160px,1fr) minmax(0,1.5fr) minmax(160px,1fr);align-items:center;gap:16px;padding:12px 24px;border-bottom:1px solid var(--line);background:white;z-index:5;min-width:0}.tts-brand{display:block;width:148px;max-height:56px}.tts-brand img{display:block;width:100%;height:56px;object-fit:contain}.course-brand{text-align:center;min-width:0;display:flex;align-items:center;justify-content:center;gap:12px}.course-brand strong{font-size:18px;font-weight:750;letter-spacing:-.025em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.course-brand img{max-width:240px;max-height:50px;object-fit:contain}.review-label{font-size:10px;letter-spacing:.05em;color:var(--secondary);border:1px solid var(--line);padding:2px 6px;border-radius:4px;white-space:nowrap}.global-actions{justify-self:end;display:flex;gap:8px}.global-button,.utility-button,.icon-button,.secondary-button,.primary-button,.text-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border-radius:6px;padding:8px 12px;font-size:13px;font-weight:650;border:1px solid var(--line);background:white}.global-button:hover,.utility-button:hover,.secondary-button:hover{background:var(--subtle)}.icon-button{padding:8px;width:44px;flex:none}.primary-button{background:var(--accent);border-color:var(--accent);color:white}.primary-button:hover{background:var(--accent-hover)}.text-button{border:0;background:transparent;color:var(--accent);padding-inline:0}.workspace{display:grid;grid-template-columns:var(--rail) minmax(0,1fr);min-height:0;min-width:0}.resource-rail{background:var(--ink);color:white;padding:20px 12px 12px;display:flex;flex-direction:column;gap:20px;overflow-y:auto;min-height:0;scrollbar-width:thin}.resource-rail nav{display:grid;gap:6px}.resource-button,.lesson-switch,.rail-toggle{border:0;display:flex;align-items:center;gap:12px;min-height:48px;width:100%;padding:12px;border-radius:6px;background:transparent;color:#d8dcdf;text-align:start;font-size:13px;line-height:1.4;font-weight:600}.resource-button:hover,.rail-toggle:hover{background:#393c42}.resource-button[aria-current="page"]{background:#41434a;color:white;box-shadow:inset 3px 0 var(--coral)}.resource-button[aria-current="page"] .icon{color:#ffabb3}.lesson-switch{border:1px solid #61646b;color:white}.lesson-switch:hover{background:#393c42}.rail-bottom{margin-top:auto;border-top:1px solid #4a4d53;padding:12px 0 0}.rail-progress{font-size:12px;margin:8px 12px 12px;color:#d8dcdf}.save-status{font-size:11px;color:#c2c7cc;margin:8px 12px;line-height:1.55}.rail-bottom .text-button{color:#ffc6cd;margin:0 12px;font-size:12px}.rail-toggle{font-size:12px;color:#d8dcdf}.learning-area{display:grid;grid-template-rows:auto minmax(0,1fr);min-height:0;min-width:0}.view-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 24px;border-bottom:1px solid var(--line);min-width:0}.view-title{display:grid;gap:3px;min-width:0}.eyebrow{font-size:10px;font-weight:750;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}.view-title strong{font-size:15px;font-weight:650;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;max-width:55vw}.view-controls{display:flex;align-items:center;gap:8px;flex:none}.view-body{display:grid;grid-template-columns:var(--outline) minmax(0,1fr);min-width:0;min-height:0}.outline{background:white;border-inline-end:1px solid var(--line);overflow-y:auto;padding:16px 12px;min-width:0;min-height:0}.outline-inner{min-width:0}.outline-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:0 4px;margin-bottom:16px}.outline-heading strong{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em}.outline-heading .icon-button{border:0;background:transparent}.outline-list{display:grid;gap:6px}.outline-item{display:flex;align-items:flex-start;gap:10px;border:0;border-inline-start:3px solid transparent;border-radius:4px;padding:12px 8px;background:transparent;min-height:52px;text-align:start;width:100%;font-size:12px;font-weight:550;line-height:1.5;overflow-wrap:anywhere}.outline-item:hover{background:var(--warm)}.outline-item[aria-current="step"]{background:#fbf0f1;border-inline-start-color:var(--accent);font-weight:700;color:#872c3b}.outline-number{font-size:10px;line-height:24px;flex:none;width:24px;height:24px;display:grid;place-items:center;background:var(--subtle);border-radius:50%;color:var(--secondary)}.outline-item[aria-current="step"] .outline-number{background:var(--accent);color:white}input[type="search"]{width:100%;padding:10px;border:1px solid var(--line);border-radius:5px;margin-bottom:12px;background:white;font-size:13px;min-height:44px}.content{overflow-y:auto;padding:24px;min-width:0;scrollbar-gutter:stable;outline:none}.scene-card{container-type:inline-size;background:white;border:1px solid var(--line);border-radius:10px;padding:clamp(20px,3vw,36px);max-width:1320px;margin:0 auto;min-width:0;overflow-wrap:anywhere}.scene-card h1{font-size:clamp(24px,2.6vw,34px);font-weight:730;line-height:1.18;letter-spacing:-.035em;margin:10px 0 16px;max-width:30ch}.scene-lead{font-size:calc(16px * var(--reading-scale));line-height:1.7;color:var(--secondary);margin:0 0 24px;max-width:78ch}.scene-card p{white-space:pre-line}.diagram{display:grid;grid-template-columns:1fr;gap:16px;margin:0}.image-stage{position:relative;min-width:0;align-self:start}.image-stage img{display:block;width:100%;height:auto;border-radius:7px;background:var(--subtle)}.hotspot{position:absolute;transform:translate(-50%,-50%);border:3px solid white;box-shadow:0 2px 6px #25272b66;background:var(--accent);color:white;width:44px;height:44px;min-height:44px;border-radius:50%;padding:0;font-weight:bold;line-height:1}.diagram-labels{padding:0;margin:0;display:grid;gap:8px;list-style:none;align-content:start}.diagram-labels li{display:flex;gap:12px;border:1px solid var(--line);border-radius:5px;padding:12px;font-size:calc(14px * var(--reading-scale));line-height:1.6;min-width:0}.label-number{width:24px;height:24px;display:grid;place-items:center;flex:none;border-radius:50%;background:#fbf0f1;color:var(--accent);font-size:11px;font-weight:700}.process-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}.process-list li{display:flex;align-items:baseline;gap:20px;padding:16px;background:var(--warm);border:1px solid var(--line);border-radius:6px}.process-list p{font-size:calc(16px * var(--reading-scale));line-height:1.7;margin:0}.step-number{font-weight:700;font-size:22px;color:var(--accent);flex:none}.transcript{margin-top:24px;border-top:1px solid var(--line);padding-top:12px;font-size:calc(14px * var(--reading-scale));color:var(--secondary)}summary{font-size:13px;font-weight:650;cursor:pointer;min-height:44px;padding:10px 0}.transcript p,.manual-copy{line-height:1.8;max-width:75ch}.manual-article{max-width:960px}.manual-copy{font-size:calc(17px * var(--reading-scale));margin-top:24px}.manual-article .diagram{margin:28px 0}.manual-article h1{max-width:26ch}.scene-footer{display:flex;justify-content:space-between;align-items:center;gap:12px;max-width:1320px;margin:16px auto 0}.position{color:var(--secondary);font-size:12px;white-space:nowrap}.scene-footer button{font-size:13px}.review-note{font-size:11px;color:var(--secondary);text-align:center;max-width:1080px;margin:16px auto 0}.term{font:inherit;display:inline;border:0;border-bottom:1px dotted var(--accent);color:#982c40;background:transparent;padding:0;line-height:inherit;text-align:inherit}.term:hover{background:#fbf0f1}.term-popup{position:fixed;margin:0;width:min(360px,calc(100vw - 24px));padding:24px;border:1px solid var(--line);border-radius:8px;background:white;box-shadow:0 12px 40px #25272b30;z-index:20;color:var(--ink);max-height:80dvh;overflow-y:auto}.term-popup h2{font-size:18px;margin:12px 24px 12px 0}.term-popup p{font-size:15px;line-height:1.7;margin:0}.popup-close{position:absolute;right:4px;top:4px;border:0}.answer-option{display:flex;align-items:center;gap:12px;border:1px solid var(--line);padding:16px;border-radius:6px;margin-bottom:10px;min-height:52px;cursor:pointer;font-size:calc(16px * var(--reading-scale))}.answer-option:has(input:checked){background:#fbf0f1;border-color:var(--accent)}fieldset{border:0;min-width:0;padding:0;margin:24px 0}legend{font-weight:650;font-size:14px;margin-bottom:12px}.answer-option input{width:20px;height:20px;accent-color:var(--accent);flex:none}.feedback{min-height:24px;font-size:calc(15px * var(--reading-scale));line-height:1.7}.decision-choices{display:grid;gap:12px;margin:24px 0}.decision-choice{display:block;text-align:start;min-height:52px;border:1px solid var(--line);background:white;padding:16px;border-radius:6px;font-size:calc(16px * var(--reading-scale))}.decision-choice[aria-pressed="true"]{background:#fbf0f1;border-color:var(--accent)}.decision-outcome:empty{display:none}.decision-outcome{padding:20px;border-inline-start:3px solid var(--accent);background:var(--warm);border-radius:4px;font-size:calc(16px * var(--reading-scale))}.decision-outcome h2{font-size:16px;margin:0 0 12px}video{width:100%;max-height:65dvh;background:var(--ink);border-radius:6px;display:block}audio{width:min(100%,480px);margin-top:20px}dialog{color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:24px;max-width:min(560px,calc(100vw - 24px));width:560px;max-height:calc(100dvh - 32px);overflow-y:auto;background:white;box-shadow:0 16px 80px #25272b44}dialog::backdrop{background:#25272b75;backdrop-filter:blur(2px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:24px}.dialog-head h2{font-size:20px;line-height:1.3;margin:0}.dialog-head .icon-button{border:0}.settings{display:grid;gap:20px}.settings label{display:grid;gap:8px;font-size:14px;font-weight:650}.settings select{width:100%;min-height:48px;padding:10px;border:1px solid var(--line);background:white;border-radius:6px;font-weight:400}.settings label.check-setting{display:flex;align-items:center;min-height:44px}.check-setting input{width:20px;height:20px;accent-color:var(--accent)}.muted{font-size:13px;line-height:1.7;color:var(--secondary);margin:0}.lesson-list{display:grid;gap:12px}.lesson-list h3{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--secondary);margin:8px 0 0}.lesson-choice{display:flex;align-items:center;gap:16px;width:100%;min-height:64px;text-align:start;padding:16px;border:1px solid var(--line);border-radius:6px;background:white}.lesson-choice[aria-current]{background:#fbf0f1;border-color:var(--accent)}.lesson-choice>span:last-child{flex:1}.lesson-choice .icon{order:3}.lesson-index{font-size:12px;color:var(--accent);font-weight:700}.notice{padding:16px;border-inline-start:3px solid var(--accent);background:var(--warm)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}.mobile-nav,.mobile-lessons{display:none}
.icon-button>span{display:none}.chapter-anchors{display:flex;flex-wrap:wrap;gap:8px 20px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:24px}.chapter-anchors a{display:inline-flex;align-items:center;min-height:44px;font-size:14px}.manual-article h2{font-size:22px;line-height:1.35;margin:28px 0 12px}.manual-article .on-this-page{font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:var(--secondary)}.inline-video{margin-top:24px}.inline-video>.scene-card{border-radius:6px;padding:20px}.inline-video h2{font-size:20px;margin:12px 0}.manual-article section{scroll-margin-top:16px}
/* Independent collapse states; focus preserves each preference for restoration. */
.rail-collapsed{--rail:72px}.rail-collapsed .resource-rail{padding-inline:12px}.rail-collapsed .resource-button,.rail-collapsed .lesson-switch,.rail-collapsed .rail-toggle{justify-content:center;padding:12px}.rail-collapsed .resource-button>span,.rail-collapsed .lesson-switch>span,.rail-collapsed .rail-toggle>span,.rail-collapsed .rail-progress,.rail-collapsed .save-status{display:none}.outline-hidden .view-body{grid-template-columns:1fr}.outline-hidden .outline{display:none}.focused{grid-template-rows:minmax(0,1fr)}.focused .topbar,.focused .resource-rail,.focused .outline,.focused .mobile-nav{display:none}.focused .workspace,.focused .view-body{grid-template-columns:minmax(0,1fr)}.focused .content{padding:24px max(24px,calc((100vw - 1440px)/2))}.focused .view-toolbar{padding:12px 24px}.focused .view-title{display:flex;align-items:center;gap:12px}.high-contrast{--accent:#8c1830;--secondary:#25272b;--line:#70757a;--warm:#fff;--subtle:#e2e5e7}.high-contrast .eyebrow{color:#8c1830}.reduced-motion *{scroll-behavior:auto!important;animation:none!important;transition:none!important}
@container (min-width:850px){.diagram{grid-template-columns:minmax(0,1fr) minmax(180px,240px);align-items:start}.manual-article .diagram{grid-template-columns:1fr}}
@media(max-width:1150px){:root{--rail:184px;--outline:200px}.rail-collapsed{--rail:72px}.global-button>span{display:none}.global-button{width:44px;padding:8px}.topbar{grid-template-columns:160px minmax(0,1fr) 96px}.review-label{display:none}.view-toolbar{padding:16px}.content{padding:16px}.utility-button{font-size:12px}.view-title strong{max-width:44vw}}
@media(max-width:900px){.workspace{grid-template-columns:minmax(0,1fr)}.resource-rail{display:none}.view-body{grid-template-columns:minmax(0,1fr)}.outline{display:none}.app{grid-template-rows:72px minmax(0,1fr) auto}.mobile-nav{display:flex;justify-content:space-around;gap:0;background:white;border-top:1px solid var(--line);padding:4px max(4px,env(safe-area-inset-right)) max(4px,env(safe-area-inset-bottom)) max(4px,env(safe-area-inset-left));z-index:5}.mobile-resource{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;flex:1;min-width:0;min-height:56px;border:0;background:white;color:var(--secondary);padding:6px 2px;font-size:10px;line-height:1.2;text-align:center;overflow-wrap:anywhere}.mobile-resource[aria-current="page"]{color:var(--accent);font-weight:700;background:#fbf0f1;border-radius:5px}.mobile-resource .icon{width:21px;height:21px}.mobile-lessons{display:inline-flex}.view-title strong{max-width:50vw}.view-controls .utility-button>span{display:none}.view-controls .utility-button{width:44px;padding:8px}.view-toolbar{gap:8px;padding:12px 16px}.focused{grid-template-rows:minmax(0,1fr)}.focused .view-controls #focus-toggle>span{display:inline}.focused .view-controls #focus-toggle{width:auto}.focused .view-title{display:grid;gap:2px}.focused .view-toolbar{padding:8px 12px}.focused .content{padding:12px}.focused .view-title strong{max-width:40vw}dialog{max-height:calc(100dvh - 24px)}.outline-item{font-size:14px;min-height:56px}.outline-heading{margin-bottom:12px}}
@media(max-width:600px){.app{grid-template-rows:64px minmax(0,1fr) auto}.topbar{grid-template-columns:52px minmax(0,1fr) 96px;gap:8px;padding:8px 12px}.tts-brand{width:48px}.tts-brand img{height:38px}.course-brand strong{font-size:14px;line-height:1.25;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-brand img{max-width:130px;max-height:42px}.global-actions{gap:4px}.view-title strong{font-size:12px;max-width:calc(100vw - 180px)}.eyebrow{font-size:9px}.view-toolbar{padding:10px 12px}.view-controls{gap:4px}.content{padding:12px}.scene-card{padding:20px 16px;border-radius:8px}.scene-card h1{font-size:25px;line-height:1.2}.scene-lead{font-size:calc(15px * var(--reading-scale));line-height:1.7;margin-bottom:20px}.diagram-labels li{font-size:calc(14px * var(--reading-scale))}.process-list li{padding:12px;gap:12px}.process-list p{font-size:calc(15px * var(--reading-scale))}.scene-footer{gap:8px;flex-wrap:wrap}.scene-footer button{padding:8px 10px;font-size:12px}.position{font-size:11px}.scene-footer .primary-button{margin-inline-start:auto}.scene-footer .icon{width:17px;height:17px}.review-note{font-size:10px}.focused{grid-template-rows:minmax(0,1fr)}.focused .scene-card h1{font-size:25px}.focused .view-controls #focus-toggle>span{font-size:11px}.focused .view-title strong{max-width:calc(100vw - 200px)}.answer-option{padding:12px;font-size:calc(15px * var(--reading-scale))}dialog{padding:20px;border-radius:12px}.dialog-head{margin-bottom:16px}.dialog-head h2{font-size:18px}.manual-copy{font-size:calc(16px * var(--reading-scale))}}
@media(max-height:500px) and (max-width:1000px){.app{grid-template-rows:56px minmax(0,1fr) auto}.topbar{padding-block:4px}.tts-brand img{height:40px}.view-toolbar{padding-block:4px}.mobile-resource{min-height:44px;flex-direction:row;gap:6px}.mobile-resource .icon{width:17px;height:17px}.mobile-nav{padding-block:2px}.focused{grid-template-rows:minmax(0,1fr)}.focused .view-toolbar{min-height:48px}.scene-card{padding:20px}.scene-card h1{font-size:26px}.content{padding:12px}video{max-height:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{.topbar,.resource-rail,.view-toolbar,.outline,.mobile-nav,.scene-footer,.review-note,.transcript,dialog{display:none!important}.app,.workspace,.learning-area,.view-body,.content{display:block!important;height:auto;overflow:visible;padding:0}.scene-card{border:0;max-width:none}.term{border:0;color:inherit}}
/* Guided presentation: the screen is the canvas; reading views retain their own scroll. */
#learning-content.view-guided{display:grid;grid-template-rows:minmax(0,1fr) auto;gap:8px;overflow:hidden;scrollbar-gutter:auto;padding:12px;min-height:0}
.guided-stage{position:relative;min-height:0;min-width:0;height:100%;width:100%;isolation:isolate}
.guided-card.scene-card{height:100%;width:100%;max-width:none;margin:0;padding:20px 56px;display:grid;grid-template-rows:auto minmax(0,1fr);gap:16px;min-height:0;container-type:normal}
.guided-card .guided-heading{min-width:0;background:transparent;padding:0;border:0;display:block}
.guided-card .guided-heading h1{font-size:clamp(20px,2vw,30px);line-height:1.18;margin:0;max-width:none;letter-spacing:-.025em;overflow-wrap:anywhere}
.guided-body{display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr) minmax(0,1fr);gap:16px;min-height:0;min-width:0}
.guided-stage[data-layout="wide"] .guided-body{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);grid-template-rows:minmax(0,1fr)}
.guided-card.text-scene .guided-body{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr)}
.guided-media{position:relative;min-height:0;min-width:0;width:100%;height:100%;margin:0;background:var(--warm);border-radius:6px}
.guided-media>img{display:block;width:100%;height:100%;min-height:0;object-fit:contain;border-radius:6px}
.guided-explanation{display:flex;flex-direction:column;justify-content:center;min-width:0;min-height:0;overflow:hidden;font-size:calc(16px * var(--reading-scale));line-height:1.6}
.guided-flow{flex:none;width:100%;min-width:0;margin:0}
.guided-fragment{display:flex;gap:10px;align-items:flex-start;margin:0 0 12px;min-width:0;overflow-wrap:anywhere}
.guided-fragment:last-child{margin-bottom:0}.guided-fragment p{margin:0;font:inherit;line-height:inherit;min-width:0;max-width:68ch;white-space:pre-line}
.guided-fragment .label-number{margin-top:2px}.guided-fragment.fragment-title{font-weight:700;color:var(--ink)}
.guided-card.text-scene .guided-explanation{max-width:72ch;width:100%;justify-self:center}
.guided-card.text-scene .fragment-step{padding:12px;background:var(--warm);border-radius:6px}
.guided-edge{position:absolute;top:50%;transform:translateY(-50%);display:flex;align-items:center;justify-content:center;gap:8px;width:44px;min-height:64px;padding:10px;border:1px solid var(--line);background:var(--surface);color:var(--accent);border-radius:8px;z-index:4;box-shadow:0 3px 12px #25272b12;font-size:13px;font-weight:650;overflow:hidden;white-space:nowrap}
.guided-edge .icon{width:22px;height:22px}.guided-previous{left:0}.guided-next{right:0}.guided-edge>span{display:none}.guided-edge:not(:disabled):hover,.guided-edge:focus-visible{width:auto;max-width:calc(100% - 56px);padding-inline:14px;overflow:visible}.guided-edge:not(:disabled):hover>span,.guided-edge:focus-visible>span{display:block;white-space:normal}.guided-edge:active{background:#fbf0f1}.guided-edge:disabled{opacity:.3}
.guided-dock{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:12px;min-height:48px;padding:0 4px}
.guided-position{justify-self:start;min-width:0;font-size:11px;color:var(--secondary);line-height:1.4}.guided-position span{display:block;overflow-wrap:anywhere}
.script-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:8px 16px;border:1px solid var(--line);border-radius:6px;background:white;font-size:13px;font-weight:650}
.script-button:hover{background:var(--subtle)}.guided-media-actions{display:flex;justify-content:flex-end;align-items:center;gap:4px;min-width:0}
.script-body{font-size:calc(16px * var(--reading-scale));line-height:1.8;white-space:pre-line}.script-body h3{font-size:20px;line-height:1.35;margin:0 0 20px}.script-body p{margin:0 0 16px}
.save-status:empty{display:none}
@media(max-width:600px){#learning-content.view-guided{padding:8px;gap:4px}.guided-card.scene-card{padding:12px 48px;gap:12px}.guided-card .guided-heading h1{font-size:19px;line-height:1.2}.guided-body{gap:10px}.guided-explanation{font-size:calc(15px * var(--reading-scale));line-height:1.55}.guided-fragment{margin-bottom:10px;gap:8px}.guided-card.text-scene .fragment-step{padding:8px}.guided-dock{min-height:48px;gap:6px}.script-button{padding:8px 12px}.guided-position{font-size:10px}.guided-edge{min-height:56px}}
@media(max-height:500px){#learning-content.view-guided{padding:6px;gap:4px}.guided-card.scene-card{padding:10px 48px;gap:8px}.guided-card .guided-heading h1{font-size:18px;line-height:1.15}.guided-explanation{font-size:calc(14px * var(--reading-scale));line-height:1.45}.guided-body{gap:12px}.guided-fragment{margin-bottom:8px}.guided-card.text-scene .fragment-step{padding:6px}.guided-dock{min-height:44px}.guided-edge{min-height:48px}.guided-position{font-size:10px}.script-button{min-height:44px;padding-block:6px}}
/* The video itself uses the available canvas; its reading material opens separately. */
#learning-content.view-videos{display:grid;grid-template-rows:minmax(0,1fr);overflow:hidden;scrollbar-gutter:auto;min-height:0;padding:12px}
.video-card.scene-card{display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:12px;padding:16px;height:100%;width:100%;max-width:none;min-height:0;min-width:0;container-type:normal}
.video-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:0;min-width:0}
.video-card .video-heading h1{font-size:clamp(18px,2vw,26px);line-height:1.2;margin:0;max-width:none;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.video-position{font-size:11px;color:var(--secondary);white-space:nowrap;flex:none}
.video-stage{min-height:0;min-width:0;display:grid;overflow:hidden;border-radius:6px;background:var(--ink)}
.video-card .video-stage video{width:100%;height:100%;min-height:0;max-height:none;object-fit:contain;border-radius:0}
.video-stage .notice{align-self:center;margin:0;padding:12px;color:white;overflow:auto;max-height:100%}
.video-tools{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;gap:12px;align-items:center;min-height:44px;min-width:0}
.video-transcript-button{grid-column:2;justify-self:center;max-width:100%;min-width:0;white-space:nowrap}
.video-transcript-button>span{overflow:hidden;text-overflow:ellipsis;min-width:0}.video-tools>.icon-button:last-child{grid-column:3}
.video-dialog[open]{display:grid;grid-template-rows:auto minmax(0,1fr);gap:12px;width:min(1120px,calc(100vw - 24px));height:calc(100dvh - 24px);max-width:none;max-height:none;overflow:hidden;padding:16px}
.video-dialog .dialog-head{margin:0;min-width:0;min-height:44px}.video-dialog .dialog-head h2{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.video-dialog #dialog-body{min-height:0;min-width:0}.video-dialog .video-card{padding:0;border:0;grid-template-rows:minmax(0,1fr) auto;gap:12px}
.video-dialog .video-heading{display:none}
@media(max-width:600px){#learning-content.view-videos{padding:8px}.video-card.scene-card{padding:10px;gap:8px}.video-card .video-heading h1{font-size:18px}.video-tools{gap:8px}.video-dialog[open]{padding:12px}.video-dialog .video-card{padding:0}}
@media(max-height:500px){#learning-content.view-videos{padding:6px}.video-card.scene-card{padding:8px;gap:6px}.video-card .video-heading h1{font-size:18px}.video-dialog[open]{padding:8px;gap:6px}.video-dialog .video-card{padding:0;gap:6px}}
@media(min-width:500px) and (max-width:1000px) and (max-height:400px){
  .app:not(.focused) .view-videos .video-card{position:relative;padding:0;grid-template-rows:minmax(0,1fr)}
  .app:not(.focused) .view-videos .video-heading{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
  .app:not(.focused) .view-videos .video-tools{position:absolute;inset:6px 6px auto auto;display:block;min-height:0}
  .app:not(.focused) .view-videos .video-tools>.icon-button{display:none}
  .app:not(.focused) .view-videos .video-transcript-button{width:44px;padding:10px;box-shadow:0 2px 8px #0004}
  .app:not(.focused) .view-videos .video-transcript-button>span{display:none}
}

/* Showcase-only empty state: no lesson completion action. */
.demo-empty{margin:auto;max-width:620px;padding:45px 30px;text-align:center;align-self:center}.demo-empty-symbol{display:grid;place-items:center;background:#f2e6e5;color:#b63b4c;width:76px;height:76px;border-radius:16px;margin:0 auto 25px;font-size:40px}.demo-empty h1{font-size:clamp(25px,3vw,38px);line-height:1.2;margin:12px 0 20px}.demo-empty>p:not(.eyebrow){font-size:16px;line-height:1.7;color:#515a63;margin-bottom:25px}.demo-empty .eyebrow{color:#515a63}.demo-empty .primary-button{margin:auto}.demo-back{font-size:12px;white-space:nowrap;color:#515a63;text-decoration:underline;padding:8px}.course-brand img{max-height:58px;max-width:260px;object-fit:contain}.view-guided:has(.demo-empty){display:flex!important;align-items:center;justify-content:center}.demo-empty-symbol{flex-shrink:0}.demo-empty p{overflow-wrap:break-word}.demo-empty>p:not(.eyebrow){font-size:calc(16px * var(--reading-scale))}.demo-back{display:inline-flex;align-items:center;justify-content:center;min-height:44px}.demo-back::before{content:'↩';display:none}.demo-empty h1{font-size:calc(32px * var(--reading-scale))}html[dir=rtl] .demo-empty h1{line-height:1.4}@media(max-width:1150px){.topbar{grid-template-columns:160px minmax(0,1fr) 140px}.demo-back{width:44px;padding:8px}.demo-back>span{display:none}.demo-back::before{display:block;font-size:22px}}@media(max-width:600px){.topbar{grid-template-columns:52px minmax(0,1fr) 140px}.demo-empty{padding:30px 18px}.demo-back{font-size:10px;max-width:44px;white-space:normal}.course-brand img{max-width:120px;max-height:40px}.demo-empty h1{font-size:26px}.global-actions{gap:3px}}

/* Shared showcase interaction treatment, respecting each learner's motion preference. */
button,a{transition:background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease}button:enabled:hover,.demo-back:hover{box-shadow:0 3px 10px #25272b13;transform:translateY(-1px)}button:enabled:active,.demo-back:active{box-shadow:none;transform:translateY(0)}.resource-button:hover,.lesson-switch:hover,.rail-toggle:hover{box-shadow:none}.demo-back{border:1px solid var(--line);border-radius:6px;padding:8px 12px;gap:7px;text-decoration:none;font-weight:650;background:white;color:var(--ink)}.demo-back:hover{border-color:var(--accent);color:var(--accent);background:#fff5f5}.high-contrast .demo-back:hover{background:#fff;color:#8c1830}.reduced-motion button,.reduced-motion a{transition:none!important;transform:none!important}@media(max-width:1150px){.demo-back{padding:8px}}@media(prefers-reduced-motion:reduce){button,a{transition:none!important}button:enabled:hover,a:hover{transform:none!important}}

.demo-empty-symbol .icon{width:34px;height:34px;stroke-width:1.6}