/* A continuous lesson, with a quiet navigator and a single evidence drawer. */
.icon{display:block;flex:none;vertical-align:middle}
.learning-room .gallery-controls .editorial-filmstrip{align-self:center;align-items:center;height:44px}
.learning-room .gallery-controls .editorial-filmstrip button{display:flex;align-items:center;justify-content:center;flex-direction:row;flex-basis:44px;min-width:44px;max-width:44px;height:44px;min-height:44px;margin:0;line-height:1}
.learning-room .gallery-controls .editorial-filmstrip button>span{position:static;inset:auto;flex:none;align-self:center;margin:0;transform:none;line-height:0}
.gallery-controls>button .icon{width:24px;height:24px}
.learning-room .lesson-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:60px;flex:none;padding:8px 0;background:transparent}
.learning-room .lesson-navigation{margin:0 0 24px;border:0;border-bottom:1px solid var(--line)}
.learning-room .desk-footer.lesson-toolbar{margin:0;border:0;border-top:1px solid var(--line)}
.lesson-toolbar .lesson-location{display:flex;align-items:center;flex-wrap:wrap;gap:3px 10px;min-width:0;text-align:left;font-size:14px;line-height:1.4}
.lesson-toolbar [data-topic-label]{font-size:14px;font-weight:600;letter-spacing:0;text-transform:none;color:var(--muted)}
.lesson-toolbar [data-topic-counter]{display:inline;font-size:12px;font-weight:400;letter-spacing:.02em;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.lesson-toolbar-actions{display:flex;align-items:center;gap:2px;flex:none}
.learning-room .lesson-toolbar .lesson-tool{display:grid;place-items:center;place-content:center;align-content:center;justify-content:center;flex:none;width:44px;min-width:44px;height:44px;min-height:44px;padding:0;margin:0;border:0;border-radius:8px;background:transparent;color:var(--muted);line-height:1}
.learning-room .lesson-toolbar .lesson-tool .icon{width:20px;height:20px}
.learning-room .lesson-toolbar .lesson-tool:disabled{opacity:.3}
.learning-room .lesson-toolbar .lesson-read[aria-pressed=true]{background:var(--surface-soft);color:var(--ink)}
.learning-room .lesson-toolbar .lesson-tool[hidden],.learning-room .lesson-toolbar .room-stage-jump{display:none}
.learning-room .lesson-storage-warning{margin:-12px 0 20px;font-size:13px;line-height:1.5;color:var(--muted)}
.learning-room .room-lesson{width:100%;max-width:none;margin:0}
@media(hover:hover){.learning-room .lesson-toolbar .lesson-tool:not(:disabled):hover{background:var(--surface-soft);color:var(--ink)}}
@media(min-width:1000px){.learning-room .room-spread{height:min(calc(100dvh - 190px),clamp(760px,50vw,1020px))}}
@media(max-width:999px){.learning-room .lesson-toolbar .room-stage-jump{display:grid}.learning-room .desk-scroll{padding-bottom:12px}}
@media print{.lesson-toolbar{display:none!important}}
.course-lesson .lesson-questions{border:0;margin:36px 0;padding:0}
.lesson-clarification+.lesson-clarification{margin-top:28px}
.learning-room .lesson-clarification h3{font-size:clamp(23px,2vw,29px);line-height:1.3;margin:0 0 12px;color:var(--ink)}
.learning-room .lesson-clarification p{margin:0;color:var(--body-copy);font-size:18px;line-height:1.8}
.lesson-synthesis{margin:40px 0 32px;padding:28px 0 0;border-top:1px solid var(--line)}
.lesson-synthesis .eyebrow,.lesson-related>.eyebrow{font-size:11px;letter-spacing:.12em;font-weight:650;color:var(--muted)}
.lesson-synthesis .lesson-takeaway{padding:0;background:none;border:0;border-radius:0;margin:0 0 24px}
.lesson-synthesis .lesson-takeaway p{font-family:Georgia,serif;font-size:clamp(24px,2.2vw,30px);line-height:1.4;color:var(--ink);margin:12px 0 0}
.lesson-synthesis .lesson-vocabulary{display:grid;gap:12px;padding:0;margin:0 0 32px;border:0;background:none}
.lesson-vocabulary>div{display:block;font-size:16px;line-height:1.65;color:var(--body-copy)}
.lesson-vocabulary dt{display:inline;font-size:inherit;font-weight:650;color:var(--ink)}
.lesson-vocabulary dt::after{content:' — ';font-weight:400;color:var(--muted)}
.lesson-vocabulary dd{display:inline;margin:0;font-size:inherit;color:var(--body-copy)}
.lesson-synthesis .lesson-check,.lesson-check{border:0;margin:28px 0 0;padding:0;background:none}
.lesson-check h3{font-size:clamp(23px,2vw,29px);line-height:1.35;margin:12px 0 20px;color:var(--ink)}
.lesson-check-choices{display:grid;gap:10px}
:root .lesson-check .lesson-check-choices button{display:flex;align-items:center;gap:14px;min-height:56px;padding:14px 16px;font-size:17px;line-height:1.5;text-align:left;color:var(--ink);border:1px solid var(--line);border-radius:12px;background:var(--surface)}
:root .lesson-check .lesson-check-choices button:hover{background:var(--surface-soft)}
:root .lesson-check .lesson-check-choices button[aria-pressed=true]{border-color:var(--muted);background:var(--surface-soft)}
.answer-marker{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:50%;background:var(--surface-soft);color:var(--muted);font-size:12px;font-weight:650}
.answer-marker .icon{width:18px;height:18px}
.lesson-check-feedback{padding:18px 0 0;margin:0;color:var(--body-copy);background:none;border:0;font-size:17px;line-height:1.7}
.lesson-check-feedback strong{color:var(--ink)}
.lesson-check-feedback p{margin:8px 0 0!important;font-size:17px!important}
.lesson-related{display:grid;gap:0;margin:32px 0 0;padding:0;border:0}
.lesson-related>.eyebrow{margin-bottom:10px}
.learning-room .lesson-related a{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:12px 0;min-height:48px;border:0;color:var(--ink);font-size:16px;line-height:1.5;text-decoration:none}
.learning-room .lesson-related a+a{border-top:1px solid var(--line)}
.lesson-related a:hover span{text-decoration:underline;text-underline-offset:4px}
.lesson-related .icon{width:19px;height:19px}
.learning-room .course-lesson>details.lesson-references{margin:12px 0 0;border-top:1px solid var(--line);border-bottom:0;padding:0}
.lesson-references>summary{display:flex!important;align-items:center;gap:12px;min-height:60px;padding:14px 0!important;font-family:inherit!important;font-size:15px!important;font-weight:600;line-height:1.5;color:var(--muted)!important;list-style:none}
.lesson-references summary::-webkit-details-marker{display:none}
.lesson-references>summary::after{display:none!important}
.lesson-references>summary>.icon{width:19px;height:19px}
.lesson-references>summary>.icon:last-child{margin-left:auto;transition:transform .2s}
.lesson-references[open]>summary>.icon:last-child{transform:rotate(180deg)}
.lesson-reference-content{padding:8px 0 20px}
.lesson-reference-content>h3{font-family:inherit!important;font-size:14px!important;font-weight:650!important;margin:20px 0 12px!important;color:var(--ink)}
.lesson-reference-content .guide-citations{display:grid;gap:0;margin:0}
.lesson-reference-content .source-link{display:flex;gap:12px;align-items:flex-start;justify-content:space-between;padding:10px 0;font-size:14px;line-height:1.6;color:var(--body-copy);overflow-wrap:anywhere}
.source-link .icon{width:16px;height:16px;margin-top:3px}
.lesson-image-credits>details{padding:0!important;border:0!important;margin:0!important}
.lesson-image-credits summary{display:flex!important;align-items:center;gap:12px;min-height:68px;padding:10px 0!important;font-family:inherit!important;font-size:14px!important;line-height:1.45;list-style:none}
.lesson-image-credits summary::after{display:none!important}
.lesson-image-credits summary img{object-fit:cover;width:64px;height:48px;border-radius:6px;flex:none}
.lesson-image-credits summary span{flex:1}
.lesson-image-credits summary small{display:block;font-size:12px;color:var(--muted);margin-top:3px}
.lesson-image-credits summary .icon,.lesson-model-credit summary .icon{width:16px;height:16px;flex:none}
.lesson-reference-content .editorial-credit p,.lesson-reference-content .lesson-model-credit p{color:var(--body-copy)!important;font-size:14px!important;line-height:1.7!important}
.lesson-model-credit{border:0!important;margin:12px 0!important;padding:0!important}
.lesson-model-credit summary{display:flex;align-items:center;justify-content:space-between;gap:12px;font:500 14px/1.5 system-ui!important;min-height:44px;list-style:none;padding:8px 0!important;color:var(--muted)}
.lesson-model-credit summary::after{display:none!important}
.lesson-source-archive{display:flex;align-items:center;gap:8px;min-height:44px;padding:8px 0;background:none;color:var(--ink);font-size:14px;text-align:left}
.lesson-source-archive .icon{width:16px;height:16px}
[data-browser-close]::after,[data-learning-close]::after{content:none!important}
[data-browser-close],[data-learning-close],.viewer-header [data-editorial-close],.viewer-info-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px}
.catalogue-practice{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:56px;width:100%;padding:16px 0;border-top:1px solid var(--line);background:none;color:var(--ink);text-align:left;font-size:16px}
.catalogue-practice .icon{width:20px;height:20px}
.catalogue-practice span{flex:1}
.catalogue-practice small{display:block;margin-top:4px;font-size:13px;color:var(--muted)}
.catalogue-lesson b .icon,.atlas-image-card small .icon{width:18px;height:18px}
.model-adjust button,.feature-navigation button{align-items:center;justify-content:center}
.lesson-picker:focus-visible,.lesson-source-archive:focus-visible{outline:2px solid var(--focus);outline-offset:4px}
.collection-browser .catalogue-lessons{grid-template-columns:minmax(0,1fr);gap:3px}
.collection-browser .catalogue-lessons .lesson-index-row{display:grid;grid-template-columns:28px minmax(0,1fr) 20px;align-items:center;gap:16px;width:100%;min-height:64px;padding:16px 14px;margin:0;border:0;border-radius:8px;background:transparent;color:var(--ink);text-align:left}
.collection-browser .catalogue-lessons .lesson-index-row:hover{background:transparent}
.collection-browser .catalogue-lessons .lesson-index-row[aria-current=true]{background:var(--surface-soft);border:0;box-shadow:inset 3px 0 var(--muted)}
.collection-browser .lesson-index-row>.lesson-index-number{align-self:center;padding:0;font-size:12px;line-height:1;font-variant-numeric:tabular-nums;color:var(--muted)}
.collection-browser .lesson-index-row>.lesson-index-title{display:block;font-family:inherit;font-size:18px;font-weight:500;line-height:1.5;color:var(--ink);min-width:0;overflow-wrap:break-word}
.collection-browser .lesson-index-row>.icon{width:18px;height:18px;justify-self:end;color:var(--muted)}
.collection-browser .catalogue-cluster h4{padding:0 14px;margin-bottom:8px}
.collection-browser .catalogue-count{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
:root .collection-browser .catalogue-filters button[aria-pressed=true]{border-bottom-color:var(--muted);color:var(--ink)}
@media(hover:hover) and (pointer:fine){.collection-browser .catalogue-lessons .lesson-index-row:hover{background:var(--surface-soft)}}
@media(max-width:700px){
 .collection-browser .catalogue-heading{padding:14px 16px 8px;gap:12px}
 .collection-browser .catalogue-heading .eyebrow{display:none}
 .collection-browser .catalogue-heading h2{font-size:24px;line-height:1.2;margin:0}
 .collection-browser .catalogue-heading>button{flex:none;width:44px;height:44px;padding:10px}
 .collection-browser .catalogue-tools{padding:0 16px;gap:8px}
 .collection-browser .catalogue-modes button{min-height:44px;padding:8px 12px}
 .collection-browser .catalogue-search input{min-height:44px;padding:10px 12px}
 .collection-browser .catalogue-filters{display:flex;flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin;gap:8px}
 .collection-browser .catalogue-filters button{flex:none;min-height:44px;padding:8px 4px;font-size:13px;white-space:nowrap}
 .collection-browser .catalogue-count{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
 .collection-browser .catalogue-results{padding:18px 16px calc(24px + env(safe-area-inset-bottom))}
 .collection-browser .catalogue-topic>header{padding-bottom:12px;margin-bottom:18px}
 .collection-browser .catalogue-topic h3{font-size:23px}
 .collection-browser .catalogue-lessons .lesson-index-row{grid-template-columns:24px minmax(0,1fr) 18px;gap:12px;padding:14px 12px;min-height:62px}
 .collection-browser .lesson-index-row>.lesson-index-title{font-size:17px}
 .collection-browser .catalogue-cluster h4{font-size:10px;padding:0 12px;margin-bottom:6px}
}
@media(max-width:600px){
 .learning-room .room-desk{padding:20px 16px 0}
 .learning-room .lesson-navigation{margin-bottom:22px}
 .lesson-toolbar [data-topic-label]{font-size:13px}
 .lesson-toolbar [data-topic-counter]{font-size:11px}
 .lesson-toolbar .lesson-location{gap:3px 8px}
 .lesson-synthesis{margin-top:32px;padding-top:24px}
 :root .lesson-check .lesson-check-choices button{font-size:16px;padding:12px;gap:10px}
 .lesson-reference-content .source-link{font-size:14px}
 .lesson-clarification+.lesson-clarification{margin-top:24px}
}