/* Teacher video form only; existing student layouts are unchanged. */
.library-app .teacher-editor-shell .video-editor{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(260px,1fr);gap:20px;align-items:start;}
.library-app .teacher-editor-shell .video-editor .editor-panel{min-width:0;padding:22px;border:1px solid var(--line);border-radius:16px;background:var(--surface,#fff);}
.library-app .teacher-editor-shell .video-editor .editor-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
.library-app .teacher-editor-shell .video-editor .editor-actions,.library-app .teacher-editor-shell .video-corrections{grid-column:1/-1;}
.library-app .teacher-editor-shell .video-corrections[open]{max-height:360px;overflow:auto;}
.library-app .teacher-editor-shell .video-corrections summary{cursor:pointer;font-weight:600;}
.library-app .teacher-editor-shell .video-corrections .field-label{margin-top:14px;}
.library-app .teacher-editor-shell .video-editor input[type=file]{max-width:100%;}
@media(max-width:850px){.library-app .teacher-editor-shell .video-editor{grid-template-columns:minmax(0,1fr);}}
@media(max-width:480px){.library-app .teacher-editor-shell .video-editor .editor-grid{grid-template-columns:minmax(0,1fr);}}
/* Corrected student screens inherit the established design-system and library tokens.
   Layout stays local; navigation is styled solely by the existing shared styles. */
.student-library,.student-learning{padding:0 0 var(--space-6);min-height:65vh;}
.student-screen-head{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--space-5);padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:22px;}
.student-screen-head h1{margin:0;letter-spacing:-.015em;overflow-wrap:anywhere;}
.student-screen-head p{margin:10px 0 0;color:var(--ink-soft);font-size:1rem;}
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important;}
.library-search{display:grid;grid-template-columns:minmax(0,3fr) repeat(2,minmax(130px,1fr));gap:var(--space-3);}

.library-search>*{min-width:0;}
.library-secondary{display:flex;gap:var(--space-3);align-items:center;margin:var(--space-5) 0 20px;}
.library-secondary h2{margin:0 auto 0 0;font-size:1.5rem;}
.library-secondary select{max-width:220px;}
.student-lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;}
.student-lesson-grid>.empty{grid-column:1/-1;}
.student-lesson-tile{min-width:0;border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);box-shadow:var(--shadow-sm);overflow:hidden;}
.student-lesson-tile:focus-within,.learning-feature:has(.learning-image-open:focus-visible){box-shadow:var(--focus);}
.lesson-tile-open{display:block;width:100%;padding:0;border:0;background:none;color:inherit;text-align:left;cursor:pointer;}
.lesson-tile-open:hover h3{text-decoration:underline;text-underline-offset:4px;}
.lesson-tile-open h3{font-size:1.4rem;margin:6px 20px 12px;overflow-wrap:anywhere;}
.lesson-subject{display:block;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);font-family:'IBM Plex Mono',monospace;margin-top:12px;overflow-wrap:anywhere;}
.lesson-tile-open>.lesson-subject{margin:16px 20px 0;}
.lesson-tile-meta{padding:0 20px 20px;font-size:.875rem;color:var(--ink-soft);display:flex;gap:9px;align-items:center;flex-wrap:wrap;overflow-wrap:anywhere;}
.subtitle-label{padding:3px 7px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-muted);color:var(--ink-soft);font:500 .75rem 'IBM Plex Mono',monospace;}
.lesson-visual{position:relative;aspect-ratio:16/9;background:var(--brand-soft);overflow:hidden;border-radius:var(--radius-sm);isolation:isolate;}
.lesson-visual img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1;}
.lesson-art{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;overflow:hidden;color:var(--brand);}
.lesson-art span{font-family:'Source Serif 4',serif;font-size:clamp(1.1rem,2vw,1.8rem);z-index:1;text-align:center;width:85%;overflow-wrap:anywhere;}
.lesson-art i{position:absolute;border:1px solid currentColor;opacity:.22;width:62%;height:62%;left:19%;top:19%;transform:rotate(25deg);}
.lesson-art i:nth-child(2){transform:rotate(65deg);}.lesson-art i:nth-child(3){transform:rotate(105deg);}
.visual-math{background-color:var(--paper-deep);background-image:linear-gradient(color-mix(in oklch,var(--brand) 10%,transparent) 1px,transparent 1px),linear-gradient(90deg,color-mix(in oklch,var(--brand) 10%,transparent) 1px,transparent 1px);background-size:22px 22px;}
.visual-math .lesson-art i{border-radius:50%;width:110%;height:90%;left:-5%;top:30%;transform:rotate(-25deg);}
.visual-math .lesson-art i:nth-child(2){top:50%;}.visual-math .lesson-art i:nth-child(3){top:70%;}
.visual-physics{background:var(--surface-muted);}.visual-physics .lesson-art i{border-radius:50%;width:34%;height:60%;left:12%;}.visual-physics .lesson-art i:nth-child(2){left:34%;}.visual-physics .lesson-art i:nth-child(3){left:56%;}
.visual-chemistry{background:var(--brand-deep);}.visual-chemistry .lesson-art{color:var(--brand-soft);}.visual-chemistry .lesson-art i{border-radius:50%;height:30%;top:35%;opacity:.5;}
.visual-biology{background:var(--brand-soft);}.visual-biology .lesson-art i{border-radius:0 80% 0 80%;}
.visual-language{background:var(--paper-deep);}.visual-language .lesson-art i{height:1px;transform:rotate(-12deg);width:120%;left:-10%;top:23%;}.visual-language .lesson-art i:nth-child(2){top:50%;}.visual-language .lesson-art i:nth-child(3){top:77%;}
.lesson-play,.lesson-duration{position:absolute;z-index:2;bottom:12px;background:var(--brand-deep);color:white;}
.lesson-play{left:12px;width:34px;height:34px;border:1px solid white;border-radius:50%;display:grid;place-content:center;font-size:13px;}
.lesson-duration{right:10px;border-radius:3px;font-size:.75rem;padding:1px 6px;}
.learning-feature{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden;background:var(--surface);margin-bottom:var(--space-5);}
.learning-image-open{display:block;min-width:0;background:none;border:0;padding:0;text-align:left;cursor:pointer;}
.learning-feature>.learning-image-open>.lesson-visual{height:100%;min-height:300px;border-radius:0;aspect-ratio:auto;}
.learning-feature .lesson-play{top:50%;left:50%;bottom:auto;transform:translate(-50%,-50%);width:68px;height:68px;font-size:25px;}
.learning-feature .lesson-art span{align-self:flex-start;padding-top:32px;}
.learning-feature-copy{padding:var(--space-5);min-width:0;}
.learning-feature-copy>.lesson-subject{margin-top:0;}
.learning-feature-copy h2{font-size:clamp(1.5rem,2.2vw,2rem);overflow-wrap:anywhere;margin:12px 0;}
.learning-feature-copy p{overflow-wrap:anywhere;}
.playback-position{display:flex;gap:16px;align-items:center;margin:18px 0;font-size:.8rem;color:var(--ink-soft);}
.playback-position progress{flex:1;min-width:30px;width:100%;height:8px;border:0;border-radius:9px;overflow:hidden;appearance:none;accent-color:var(--brand);}
.playback-position progress::-webkit-progress-bar{background:var(--line);border-radius:9px;}.playback-position progress::-webkit-progress-value{background:var(--brand);border-radius:9px;}.playback-position progress::-moz-progress-bar{background:var(--brand);}
.playback-position span{white-space:nowrap;}
.learning-tabs{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:var(--space-4);}
.learning-tabs button{min-height:36px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:6px 9px;font-size:.875rem;color:var(--ink-soft);white-space:nowrap;cursor:pointer;}
.learning-tabs button[aria-pressed=true]{color:var(--brand-deep);border-color:color-mix(in oklch,var(--brand) 25%,var(--line));background:var(--brand-soft);}
.learning-row{display:grid;grid-template-columns:210px minmax(0,1fr) auto;align-items:center;gap:var(--space-5);padding:var(--space-4);border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);box-shadow:var(--shadow-sm);margin-bottom:var(--space-3);}
.learning-row h2{font-size:1.4rem;margin:3px 0;overflow-wrap:anywhere;}.learning-row p{margin:4px 0;overflow-wrap:anywhere;}.learning-row .lesson-subject{margin:0;}.learning-row .playback-position{margin:10px 0 0;max-width:560px;}
.learning-row .lesson-art span{display:none;}
.learning-empty{padding:28px 0;color:var(--ink-soft);}
@media(min-width:1101px){
 .student-learning>.student-screen-head{margin-bottom:16px;padding-bottom:12px;}
 .learning-feature{margin-bottom:16px;}
 .learning-feature>.learning-image-open>.lesson-visual{min-height:240px;}
 .learning-feature-copy{padding:18px 24px;}
 .learning-feature-copy h2{margin:8px 0;}
 .learning-feature-copy p{margin:8px 0;}
 .learning-feature .playback-position{margin:12px 0;}
}
@media(max-width:1200px){.student-lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr));}.learning-row{grid-template-columns:160px minmax(0,1fr) auto;gap:16px;}}
@media(max-width:720px){.student-screen-head{align-items:flex-start;flex-wrap:wrap;gap:16px;}.student-screen-head p{font-size:1rem;}.library-search{grid-template-columns:1fr 1fr;}.library-search>label:first-child{grid-column:1/-1;}.library-secondary{flex-wrap:wrap;gap:10px;}.library-secondary h2{flex-basis:100%;}.library-secondary label{flex:1;min-width:0;}.library-secondary select{width:100%;max-width:none;}.learning-feature{grid-template-columns:1fr;}.learning-feature>.lesson-visual{min-height:0;aspect-ratio:16/9;}.learning-feature-copy{padding:20px;}.learning-row{grid-template-columns:100px minmax(0,1fr);gap:14px;}.learning-row>.button{grid-column:2;justify-self:start;}.learning-row h2{font-size:1.2rem;}.learning-row .playback-position{flex-wrap:wrap;gap:5px;}}
@media(max-width:480px){.student-lesson-grid{grid-template-columns:1fr;}.lesson-art span{font-size:1.8rem;}}
@media(max-width:720px){.learning-feature>.learning-image-open>.lesson-visual{min-height:0;aspect-ratio:16/9;}}

/* Approved catalogue screens share Testora-reference surfaces and controls.
   Each class is opt-in for its own student screen, never the lesson viewer. */
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell){
 --paper:#f6f3eb;--paper-deep:#ece9e2;--surface-muted:#f2f3f5;
 --ink:#0b2346;--ink-soft:#556173;--ink-faint:#657185;
 --brand:#183b77;--brand-deep:#102a56;--brand-soft:#edf1f7;
 --line:#ded9d1;--line-strong:#b4bdca;--radius-sm:12px;--radius-md:22px;
 --focus:0 0 0 3px #183b7780;
 background:var(--paper);
}

.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) :is(h1,h2,h3,.topbar-title){font-family:"IBM Plex Sans",system-ui,sans-serif;font-weight:600;letter-spacing:-.035em;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .topbar{background:#fcfaf3;border-bottom-color:var(--line);}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .topbar-inner{padding:14px 32px;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .topbar-title{font-size:1.125rem;letter-spacing:-.02em;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .eyebrow{font-family:inherit;letter-spacing:.05em;font-size:.75rem;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .sidebar{background:#fcfaf3;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .sidebar-nav{padding:24px 14px;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .nav-item{border-radius:12px;min-height:46px;padding:10px 14px;margin:4px 0;font-weight:500;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .nav-item.active{background:var(--brand-soft);border-color:#b7c7de;color:var(--brand-deep);box-shadow:inset 3px 0 #183b77;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .sidebar-foot{margin:12px;border:1px solid var(--line);border-radius:16px;padding:14px;background:var(--surface-muted);}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .sidebar-foot span{color:var(--ink-soft);}
/* Keep the student's full navigation visible on laptop-height windows. */
@media(min-width:981px){
 .library-app .student-shell .sidebar-nav{padding:8px 14px;min-height:0;}
 .library-app .student-shell .sidebar-nav .nav-item{min-height:36px;padding:5px 14px;margin:0;}
 .library-app .student-shell .sidebar-foot{margin:8px 12px;padding:10px;flex-shrink:0;}
 .library-app .student-shell .sidebar-foot span{margin-top:0;}
 .library-app .student-shell .sidebar-brand{flex-shrink:0;}
}
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.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .languages{padding:4px;gap:2px;background:var(--surface-muted);}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .languages button{border-radius:8px;min-height:34px;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .signout-button{min-height:42px;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .teacher-workspace{padding:28px 32px 48px;max-width:1400px;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .student-library{min-height:0;padding-bottom:0;}
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.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .library-search{flex:1;grid-template-columns:minmax(180px,1.6fr) repeat(3,minmax(110px,1fr));gap:14px;min-width:0;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .field-label{gap:8px;min-width:0;font-weight:500;}
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.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-tile-open>.lesson-subject{font:500 .8125rem/1.4 "IBM Plex Sans",system-ui,sans-serif;letter-spacing:0;text-transform:none;margin:16px 10px 0;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-tile-open h3{font-size:1.25rem;line-height:1.3;margin:6px 10px 12px;letter-spacing:-.02em;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-tile-meta{padding:0 20px 20px;line-height:1.5;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .subtitle-label{border-radius:6px;font-family:inherit;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-art span{font-family:"IBM Plex Sans",system-ui,sans-serif;font-weight:500;letter-spacing:-.025em;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-play{background:#fcfaf3;color:var(--brand-deep);border-color:#b7c7de;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-duration{border-radius:6px;background:#0b2346;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .empty{padding:40px 24px;border:1px dashed var(--line-strong);border-radius:20px;background:white;text-align:center;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .empty h2{font-size:1.5rem;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) #content>p[role=status]{padding:32px;border:1px solid var(--line);border-radius:20px;background:white;}
.library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) :is(button,input,select,a):focus-visible{outline:2px solid var(--brand);outline-offset:3px;}
@media(max-width:1300px){
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .browse-tools{flex-wrap:wrap;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .library-search{flex-basis:100%;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .browse-clear{margin-left:auto;min-height:38px;}
}
@media(max-width:980px){
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .sidebar-nav{padding:6px 8px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .nav-item{min-width:0;margin:0;padding:8px 6px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .teacher-workspace{padding:24px 20px 48px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .topbar-inner{padding:12px 20px;}
}
@media(max-width:720px){
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .topbar{position:static;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .topbar-inner{padding:12px 16px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .teacher-workspace{padding:20px 16px 32px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .student-screen-head{padding:24px;margin-bottom:16px;border-radius:20px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .browse-tools{padding:16px;gap:12px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .library-search{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 12px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .browse-search{grid-column:1/-1;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .library-search label:last-child{grid-column:1/-1;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .library-secondary{margin:24px 0 16px;}
 .library-app :is(.browse-shell,.learning-shell,.university-shell,.university-detail-shell,.portfolio-shell,.homework-shell,.lesson-shell,.teacher-catalog-shell,.teacher-editor-shell,.teacher-preview-shell,.assessment-shell,.posts-shell,.daily-shell,.work-shell,.books-shell) .lesson-art span{font-size:1.5rem;}
}

/* My Learning: resume first, then existing progress groups. Natural page flow
   keeps long titles, summaries and growing lesson histories readable. */
.library-app .learning-shell .student-learning{min-height:0;padding-bottom:0;}
/* Batch 10: teacher review controls; lesson layout is shared with the student viewer. */
.library-app .teacher-preview-shell .page-head>.button{flex:none;}
.library-app .teacher-preview-shell .review-note{padding:12px 16px;margin:0 0 16px;border:1px solid var(--line);border-radius:12px;background:var(--brand-soft);font-size:.875rem;}
.library-app .teacher-preview-shell .teacher-review-panel{display:flex;flex-wrap:wrap;align-items:center;gap:12px 16px;padding:20px 22px;margin:0 0 20px;border:1px solid var(--line);border-radius:20px;background:white;}
.library-app .teacher-preview-shell .teacher-review-panel h2{font-size:1.25rem;margin:0;}
.library-app .teacher-preview-shell .teacher-review-panel>.badge{border-radius:8px;background:var(--brand-soft);color:var(--brand-deep);}
.library-app .teacher-preview-shell .teacher-review-panel>.option{flex-basis:100%;margin:0;padding:12px;border-radius:12px;background:var(--surface-muted);align-items:flex-start;font-size:.875rem;line-height:1.6;}
.library-app .teacher-preview-shell #review-confirmed{accent-color:var(--brand);margin-top:5px;flex:none;}
.library-app .teacher-preview-shell .teacher-review-panel>.toolbar{width:100%;gap:10px;flex-wrap:wrap;}
.library-app .teacher-preview-shell .teacher-review-panel>.button{margin-left:auto;}
.library-app .teacher-preview-shell .teacher-review-panel [data-action=archive]{color:var(--ink-soft);}
@media(max-width:600px){
 .library-app .teacher-preview-shell .page-head{flex-wrap:wrap;}
 .library-app .teacher-preview-shell .teacher-review-panel{padding:18px;}
 .library-app .teacher-preview-shell .teacher-review-panel>.toolbar .button{flex:1 1 130px;}
}
/* Batch 9: teacher lesson editor, not the publication preview. */
.library-app .teacher-editor-shell .page-head{margin:16px 0;padding:18px 22px;border:1px solid #d5dce7;border-radius:22px;background:linear-gradient(115deg,#edf1f7,#f6f3eb);}
.library-app .teacher-editor-shell .page-head>div{display:flex;gap:16px;align-items:center;justify-content:space-between;width:100%;}
.library-app .teacher-editor-shell .page-head h1{font-size:clamp(1.75rem,2.5vw,2.25rem);margin:0;}
.library-app .teacher-editor-shell .review-note{border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:12px;background:var(--brand-soft);padding:14px 18px;margin:0 0 20px;font-size:.875rem;}
.library-app .teacher-editor-shell .editor-workspace{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px;align-items:start;}
.library-app .teacher-editor-shell .editor-workspace>*{min-width:0;}
.library-app .teacher-editor-shell .editor-workspace.editor-without-uploads{grid-template-columns:minmax(0,1fr);}
.library-app .teacher-editor-shell .editor-panel{background:white;border:1px solid var(--line);border-radius:20px;padding:22px;margin:0 0 20px;box-shadow:0 3px 12px #0b234606;}
.library-app .teacher-editor-shell .editor-panel h2{font-size:1.25rem;margin:0 0 18px;}
.library-app .teacher-editor-shell .editor-grid{gap:18px 16px;}
.library-app .teacher-editor-shell .editor-grid>.field-label:has([name=title]),.library-app .teacher-editor-shell .editor-grid>.field-label:has([name=class_id]){grid-column:1/-1;}
.library-app .teacher-editor-shell .editor-content-grid{grid-template-columns:minmax(0,1fr);}
.library-app .teacher-editor-shell textarea{resize:vertical;line-height:1.6;}
.library-app .teacher-editor-shell .editor-panel>.option{font-size:.875rem;align-items:flex-start;margin-bottom:0;}
.library-app .teacher-editor-shell input[type=checkbox]{accent-color:var(--brand);margin-top:5px;}
.library-app .teacher-editor-shell .repeat-row{border-radius:14px;padding:18px;background:var(--surface-muted);}
.library-app .teacher-editor-shell .repeat-row>[data-action=remove-row]{justify-self:start;align-self:end;background:white;}
.library-app .teacher-editor-shell .editor-panel>[data-action=add-row]{background:var(--brand-soft);color:var(--brand-deep);border-color:var(--line);}
.library-app .teacher-editor-shell .editor-actions{border:1px solid var(--line);border-radius:14px;padding:12px;gap:8px;background:#fcfaf3;box-shadow:0 -4px 20px #0b23460b;bottom:12px;}
.library-app .teacher-editor-shell .editor-actions .button{min-height:42px;}
.library-app .teacher-editor-shell .editor-uploads .editor-panel{padding:20px;}
.library-app .teacher-editor-shell .editor-uploads p{font-size:.8125rem;line-height:1.55;color:var(--ink-soft);}
.library-app .teacher-editor-shell .editor-uploads .field-label{margin:16px 0;}
.library-app .teacher-editor-shell input[type=file]{width:100%;min-width:0;font-size:.8125rem;padding:8px;}
.library-app .teacher-editor-shell input[type=file]::file-selector-button{border:1px solid var(--line-strong);border-radius:8px;background:var(--surface-muted);color:var(--ink);padding:6px;margin:0 6px 4px 0;}
.library-app .teacher-editor-shell .editor-uploads .button{width:100%;min-height:40px;}
@media(max-width:1150px){.library-app .teacher-editor-shell .editor-workspace{grid-template-columns:minmax(0,1fr);}}
@media(max-width:980px){.library-app .teacher-editor-shell .editor-actions{bottom:92px;}}
@media(max-width:600px){
 .library-app .teacher-editor-shell .editor-panel{padding:18px;}
 .library-app .teacher-editor-shell .editor-grid{grid-template-columns:minmax(0,1fr);}
 .library-app .teacher-editor-shell .editor-actions{flex-wrap:wrap;bottom:92px;}
 .library-app .teacher-editor-shell .editor-actions .button{flex:1;}
 .library-app .teacher-editor-shell .page-head>div{flex-wrap:wrap;}
}
/* Batch 8: teacher catalogue only, including its existing status filters. */
.library-app .teacher-catalog-shell .page-head{display:flex;align-items:center;gap:20px;padding:24px;border:1px solid #d5dce7;border-radius:22px;background:linear-gradient(115deg,#edf1f7,#f6f3eb);margin:0 0 20px;}
.library-app .teacher-catalog-shell .page-head h1{font-size:clamp(1.75rem,2.5vw,2.25rem);margin:0 0 8px;}
.library-app .teacher-catalog-shell .page-head p{margin:0;font-size:.9375rem;}
.library-app .teacher-catalog-shell .page-head>.button{flex:none;min-height:44px;}
.library-app .teacher-catalog-shell .filters{grid-template-columns:minmax(0,1fr);padding:20px;border:1px solid var(--line);border-radius:20px;background:white;gap:14px;margin:0 0 20px;align-items:end;}
.library-app .teacher-catalog-shell .video-title{font:inherit;color:inherit;text-align:left;background:none;border:0;padding:0;cursor:pointer;overflow-wrap:anywhere;}
.library-app .teacher-catalog-shell .video-title:hover{text-decoration:underline;}
.library-app .teacher-catalog-shell .video-title:focus-visible{outline:2px solid var(--brand-deep);outline-offset:4px;}
.library-app .teacher-catalog-shell .video-issue{margin-top:12px;}
.library-app .teacher-catalog-shell .filters>[data-action=clear]{grid-column:1/-1;justify-self:end;background:var(--brand-soft);color:var(--brand-deep);border-color:var(--line);}
.library-app .teacher-catalog-shell .lesson-grid{grid-template-columns:minmax(0,1fr);gap:14px;}
.library-app .teacher-catalog-shell .lesson-card{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 24px;padding:22px 24px;border-radius:20px;box-shadow:0 3px 12px #0b234606;align-items:center;}
.library-app .teacher-catalog-shell .lesson-card>.crumb{grid-column:1;grid-row:1;font-size:.75rem;}
.library-app .teacher-catalog-shell .lesson-card>h2{grid-column:1;grid-row:2;font-size:1.25rem;line-height:1.3;}
.library-app .teacher-catalog-shell .lesson-card>p{grid-column:1;grid-row:3;font-size:.875rem;line-height:1.5;overflow-wrap:anywhere;}
.library-app .teacher-catalog-shell .lesson-card>.badge{grid-column:2;grid-row:1;justify-self:end;background:var(--brand-soft);color:var(--brand-deep);border-radius:8px;}
.library-app .teacher-catalog-shell .lesson-card>.meta{grid-column:2;grid-row:2;justify-self:end;font-family:inherit;}
.library-app .teacher-catalog-shell .lesson-card>.toolbar{grid-column:2;grid-row:3;display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap;}
.library-app .teacher-catalog-shell .lesson-card .button{margin:0;min-height:40px;min-width:70px;}
.library-app .teacher-catalog-shell .lesson-card [data-action=edit]{background:var(--brand-soft);border-color:var(--line);color:var(--brand-deep);}
.library-app .teacher-catalog-shell .lesson-card:focus-within{box-shadow:var(--focus);}
.library-app .teacher-catalog-shell .lesson-grid>.empty{padding:28px;border:1px solid var(--line);border-radius:20px;background:white;}
@media(max-width:1100px){.library-app .teacher-catalog-shell .filters{grid-template-columns:minmax(0,1fr);}}
@media(max-width:600px){
 .library-app .teacher-catalog-shell .page-head{padding:20px;align-items:flex-start;flex-direction:column;}
 .library-app .teacher-catalog-shell .filters{padding:16px;}
 .library-app .teacher-catalog-shell .filters>label:first-child{grid-column:1/-1;}
 .library-app .teacher-catalog-shell .filters>label:nth-child(4){grid-column:1/-1;}
 .library-app .teacher-catalog-shell .lesson-card{padding:18px;gap:10px;}
 .library-app .teacher-catalog-shell .lesson-card>:is(.crumb,h2,p){grid-column:1/-1;}
 .library-app .teacher-catalog-shell .lesson-card>.badge{grid-column:1;grid-row:4;justify-self:start;}
 .library-app .teacher-catalog-shell .lesson-card>.meta{grid-column:2;grid-row:4;}
 .library-app .teacher-catalog-shell .lesson-card>.toolbar{grid-column:1/-1;grid-row:5;justify-content:stretch;}
 .library-app .teacher-catalog-shell .lesson-card .button{flex:1;}
}
/* Batch 7: student lesson viewer only. Teacher preview keeps its existing layout. */
.library-app :is(.lesson-shell,.teacher-preview-shell) #content>.page-head{margin:16px 0 20px;padding:18px 22px;border:1px solid #d5dce7;border-radius:22px;background:linear-gradient(115deg,#edf1f7,#f6f3eb);}
.library-app :is(.lesson-shell,.teacher-preview-shell) .page-head h1{font-size:clamp(1.75rem,2.5vw,2.25rem);margin:8px 0;line-height:1.15;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .page-head p{margin:8px 0 0;font-size:.9375rem;line-height:1.5;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .crumb{font-size:.8125rem;color:var(--brand-deep);}
.library-app :is(.lesson-shell,.teacher-preview-shell) .study-layout{grid-template-columns:minmax(0,1.8fr) minmax(300px,1fr);gap:20px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) :is(.lesson-media,.lesson-transcript,.lesson-body>section,.study-layout>aside>.panel){border:1px solid var(--line);border-radius:20px;background:white;box-shadow:0 3px 12px #0b234606;padding:20px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-media{padding:10px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #lesson-video{display:block;aspect-ratio:16/9;max-height:56dvh;border-radius:12px;object-fit:contain;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-media>.section{margin:14px 10px 8px;font-size:.8125rem;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #video-error{padding:12px;color:#9e2d25;font-size:.875rem;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-transcript{margin:0;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .study-layout h2{font-size:1.25rem;margin:0 0 16px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-transcript .field-label{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #transcript-language{width:auto;min-width:96px;min-height:40px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .transcript{max-height:32dvh;margin-bottom:16px;overscroll-behavior:contain;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .cue{border-radius:10px;font-size:.9375rem;line-height:1.5;margin:4px 0;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .cue:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .cue .meta{font-family:inherit;color:var(--brand-deep);margin-right:6px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-transcript details{border-top:1px solid var(--line);padding-top:14px;font-size:.875rem;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-transcript summary{cursor:pointer;color:var(--brand-deep);}
.library-app :is(.lesson-shell,.teacher-preview-shell) .lesson-body>section{margin:0 0 20px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .study-layout>aside>.panel{margin:0 0 20px;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .study-layout>aside ul{padding-left:20px;font-size:.9375rem;}
.library-app :is(.lesson-shell,.teacher-preview-shell) .study-layout>aside a{overflow-wrap:anywhere;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-form fieldset{border-radius:14px;background:#fcfaf3;padding:16px;margin:16px 0;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-form legend{font-size:.9375rem;overflow-wrap:anywhere;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-form .option{padding:8px 10px;margin:4px 0;border-radius:10px;cursor:pointer;font-size:.9375rem;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-form .option:has(input:checked){background:var(--brand-soft);}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-form input{accent-color:var(--brand);}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-results:empty{display:none;}
.library-app :is(.lesson-shell,.teacher-preview-shell) #practice-results .panel{border-radius:14px;background:var(--surface-muted);}
@media(max-width:1100px){
 .library-app :is(.lesson-shell,.teacher-preview-shell) .study-layout{grid-template-columns:minmax(0,1fr);gap:16px;}
 .library-app :is(.lesson-shell,.teacher-preview-shell) .transcript{max-height:360px;}
}
@media(max-width:600px){
 .library-app :is(.lesson-shell,.teacher-preview-shell) #content>.page-head{padding:18px;}
 .library-app :is(.lesson-shell,.teacher-preview-shell) :is(.lesson-transcript,.lesson-body>section,.study-layout>aside>.panel){padding:18px;}
}
.library-app .learning-shell .teacher-workspace{padding-bottom:16px;}
.library-app .learning-shell .student-screen-head{align-items:center;padding:16px 24px;margin-bottom:20px;}
.library-app .learning-shell .student-screen-head h1{font-size:clamp(2rem,2.7vw,2.25rem);}
.library-app .learning-shell .student-screen-head>.button{flex:none;min-height:42px;background:#fcfaf3;}
.library-app .learning-shell .learning-feature{grid-template-columns:minmax(0,1.6fr) minmax(220px,1fr);gap:20px;padding:12px;margin-bottom:20px;border-radius:22px;box-shadow:0 3px 12px #0b234606;}
.library-app .learning-shell .learning-feature-copy{padding:8px 12px;}
.library-app .learning-shell .lesson-subject{font:500 .8125rem/1.4 "IBM Plex Sans",system-ui,sans-serif;letter-spacing:0;text-transform:none;color:var(--brand);}
.library-app .learning-shell .learning-feature-copy>.lesson-subject{display:inline-block;margin:0;padding:4px 10px;border-radius:8px;background:var(--brand-soft);}
.library-app .learning-shell .learning-feature-copy h2{font-size:clamp(1.5rem,2.1vw,1.75rem);line-height:1.2;margin:8px 0;}
.library-app .learning-shell .learning-feature-copy p{margin:6px 0;line-height:1.5;}
.library-app .learning-shell .learning-feature>.learning-image-open{border-radius:14px;align-self:stretch;}
.library-app .learning-shell .learning-feature>.learning-image-open>.lesson-visual{min-height:220px;border-radius:14px;}
.library-app .learning-shell .learning-feature .lesson-play{width:56px;height:56px;font-size:20px;}
.library-app .learning-shell .learning-feature .lesson-art span{padding:24px 12px 0;}
.library-app .learning-shell .playback-position{margin:14px 0;gap:14px;flex-wrap:wrap;}
.library-app .learning-shell .playback-position progress{height:7px;flex-basis:100px;}
.library-app .learning-shell .button.primary{min-height:42px;padding:10px 18px;}
.library-app .learning-shell .learning-history{padding:12px;background:white;border:1px solid var(--line);border-radius:22px;}
.library-app .learning-shell .learning-tabs{display:flex;flex-wrap:wrap;gap:4px;padding:5px;margin:0 0 16px;border:1px solid var(--line);border-radius:14px;background:var(--surface-muted);width:fit-content;max-width:100%;}
.library-app .learning-shell .learning-tabs button{min-height:38px;padding:8px 16px;border-color:transparent;border-radius:10px;white-space:normal;background:transparent;font-weight:500;}
.library-app .learning-shell .learning-tabs button[aria-pressed=true]{background:var(--brand);border-color:var(--brand);color:white;}
.library-app .learning-shell .learning-row{grid-template-columns:148px minmax(0,1fr) auto;gap:20px;padding:14px 0;margin:0;border:0;border-top:1px solid var(--line);border-radius:0;box-shadow:none;background:transparent;}
.library-app .learning-shell .learning-row h2{font-size:1.25rem;line-height:1.3;margin:5px 0;letter-spacing:-.02em;}
.library-app .learning-shell .learning-row .lesson-visual{border-radius:12px;}
.library-app .learning-shell .learning-row .playback-position{margin:10px 0 0;}
.library-app .learning-shell .learning-row>.button{justify-self:end;}
.library-app .learning-shell .learning-empty{margin:0;padding:24px 16px;text-align:center;border-top:1px solid var(--line);}
@media(max-width:1100px){
 .library-app .learning-shell .learning-feature{grid-template-columns:minmax(0,1.3fr) minmax(210px,1fr);}
 .library-app .learning-shell .learning-row{grid-template-columns:120px minmax(0,1fr) auto;gap:16px;}
}
@media(max-width:720px){
 .library-app .learning-shell .student-screen-head{align-items:flex-start;gap:16px;}
 .library-app .learning-shell .learning-feature{grid-template-columns:minmax(0,1fr);gap:8px;}
 .library-app .learning-shell .learning-feature>.learning-image-open>.lesson-visual{height:auto;min-height:0;aspect-ratio:16/9;}
 .library-app .learning-shell .learning-feature-copy{padding:12px;}
 .library-app .learning-shell .learning-history{padding:12px;border-radius:20px;}
 .library-app .learning-shell .learning-tabs{width:100%;}
 .library-app .learning-shell .learning-tabs button{flex:1 1 90px;padding:8px;font-size:.8125rem;}
 .library-app .learning-shell .learning-row{grid-template-columns:88px minmax(0,1fr);gap:12px;}
 .library-app .learning-shell .learning-row>.button{grid-column:2;justify-self:start;}
 .library-app .learning-shell .learning-row h2{font-size:1.125rem;}
}
/* Approved My Learning treatment; all rules stay inside its own screen. */
.library-app .learning-shell .teacher-workspace{padding:24px 28px 40px;}
.library-app .learning-shell .student-screen-head{position:relative;isolation:isolate;padding:12px 0 24px;margin:0;border:0;border-radius:0;background:none;}
.library-app .learning-shell .student-screen-head::before{content:'';position:absolute;z-index:-1;inset:0 0 12px auto;width:36%;background:url('/alberuni-naqsh.svg') center/300px;opacity:.45;mask-image:linear-gradient(90deg,transparent,#000);pointer-events:none;}
.library-app .learning-shell .student-screen-head h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(2rem,3.2vw,3.4rem);font-weight:500;letter-spacing:-.035em;}
.library-app .learning-shell .student-screen-head p{margin-top:8px;font-size:1.05rem;color:#556173;}
.library-app .learning-shell .learning-feature{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:0;padding:0;border-radius:15px;margin-bottom:28px;}
.library-app .learning-shell .learning-feature-copy{grid-column:2;grid-row:1;align-self:center;padding:26px;}
.library-app .learning-shell .learning-feature>.learning-image-open{grid-column:1;grid-row:1;border-radius:0;}
.library-app .learning-shell .learning-feature>.learning-image-open>.lesson-visual{min-height:290px;border-radius:0;}
.library-app .learning-shell .learning-feature-copy>.lesson-subject{padding:0;border-radius:0;background:none;}
.library-app .learning-shell .learning-feature-copy h2{font-family:Georgia,'Times New Roman',serif;font-size:clamp(1.5rem,2.2vw,2rem);font-weight:500;letter-spacing:-.025em;margin:10px 0;}
.library-app .learning-shell .learning-feature-copy .button{margin-top:6px;border-radius:9px;}
.library-app .learning-shell .learning-history{padding:0;border:0;background:none;border-radius:0;}
.library-app .learning-shell .learning-tabs{gap:0;padding:0;margin-bottom:16px;border-radius:10px;overflow:hidden;background:#faf9f6;}
.library-app .learning-shell .learning-tabs button{padding:10px 18px;border-radius:0;min-height:42px;}
.library-app .learning-shell .learning-tabs button[aria-pressed=true]{background:#e2ebf6;color:#183b77;border-color:transparent;}
.library-app .learning-shell .learning-rows{display:grid;gap:12px;}
.library-app .learning-shell .learning-row{grid-template-columns:168px minmax(0,1fr) auto;padding:8px 16px 8px 8px;gap:22px;border:1px solid var(--line);border-radius:12px;background:white;box-shadow:0 3px 14px #183b7706;}
.library-app .learning-shell .learning-row .lesson-visual{border-radius:7px;}
.library-app .learning-shell .learning-row h2{font-family:Georgia,'Times New Roman',serif;font-size:1.3rem;font-weight:500;}
.library-app .learning-shell .learning-row .playback-position{max-width:360px;}
.library-app .learning-shell .learning-row>.button{background:#e2ebf6;color:#183b77;border-color:transparent;border-radius:8px;}
@media(max-width:1100px){
 .library-app .learning-shell .learning-feature-copy{padding:20px;}
 .library-app .learning-shell .learning-row{grid-template-columns:120px minmax(0,1fr) auto;gap:14px;}
}
@media(max-width:720px){
 .library-app .learning-shell .teacher-workspace{padding:18px 16px 32px;}
 .library-app .learning-shell .student-screen-head{flex-wrap:wrap;gap:14px;}
 .library-app .learning-shell .learning-feature{grid-template-columns:minmax(0,1fr);}
 .library-app .learning-shell .learning-feature>.learning-image-open{grid-column:1;grid-row:1;}
 .library-app .learning-shell .learning-feature-copy{grid-column:1;grid-row:2;padding:20px;}
 .library-app .learning-shell .learning-feature>.learning-image-open>.lesson-visual{min-height:0;height:auto;aspect-ratio:16/9;}
 .library-app .learning-shell .learning-row{grid-template-columns:88px minmax(0,1fr);gap:12px;}
 .library-app .learning-shell .learning-row>.button{grid-column:2;justify-self:start;}
 .library-app .learning-shell .learning-tabs button{padding:8px;}
 .library-app .learning-shell .learning-row h2{font-size:1.125rem;}
}
/* Approved Browse Lessons treatment: deliberately isolated from My Learning. */
.library-app .browse-shell .teacher-workspace{padding:24px 28px 40px;}
.library-app .browse-shell .student-screen-head{min-height:238px;padding:32px 36px;align-items:center;border:1px solid #dce3e8;border-radius:18px;background:#eef3f5 url('/media/browse/learning-hero.jpg') center/cover no-repeat;}
.library-app .browse-shell .student-screen-head>div{width:48%;}
.library-app .browse-shell .student-screen-head h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(2rem,3.2vw,3.4rem);font-weight:500;letter-spacing:-.035em;line-height:1.08;}
.library-app .browse-shell .student-screen-head p{max-width:32ch;color:#43556b;line-height:1.65;}
.library-app .browse-shell .browse-tools{padding:0;border:0;border-radius:0;background:none;gap:12px;}
.library-app .browse-shell .library-search{gap:12px;}
.library-app .browse-shell .library-search .field{background:#fff;border-color:#d8dfe4;border-radius:10px;}
.library-app .browse-shell .browse-clear{background:#e8edf3;border-radius:10px;}
.library-app .browse-shell .library-secondary{margin:26px 0 16px;}
.library-app .browse-shell .library-secondary h2{font-family:Georgia,'Times New Roman',serif;font-weight:500;font-size:1.65rem;letter-spacing:-.025em;}
.library-app .browse-shell .student-lesson-tile{border-radius:15px;box-shadow:0 4px 16px #183b7708;}
.library-app .browse-shell .lesson-tile-open{padding:0;border-radius:15px;}
.library-app .browse-shell .lesson-visual{border-radius:0;}
.library-app .browse-shell .lesson-art>span{align-self:flex-end;margin-bottom:18px;font-size:1rem;}
.library-app .browse-shell .lesson-play{top:50%;left:50%;bottom:auto;transform:translate(-50%,-50%);width:44px;height:44px;border:1px solid #ffffffa8;background:#ffffffde;color:#183b77;box-shadow:0 3px 16px #122d4526;}
.library-app .browse-shell .lesson-subject{margin:16px 18px 0;}
.library-app .browse-shell .lesson-tile-open h3{margin:6px 18px 12px;font-family:Georgia,'Times New Roman',serif;font-weight:500;font-size:1.35rem;line-height:1.3;}
.library-app .browse-shell .lesson-tile-meta{padding:0 18px 18px;}
@media(max-width:1100px){
 .library-app .browse-shell .student-screen-head{min-height:220px;padding:26px;}
 .library-app .browse-shell .browse-tools{flex-wrap:wrap;}
 .library-app .browse-shell .library-search{flex-basis:100%;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));}
}
@media(max-width:720px){
 .library-app .browse-shell .teacher-workspace{padding:18px 16px 32px;}
 .library-app .browse-shell .student-screen-head{min-height:350px;align-items:flex-start;padding:24px;background-size:auto 190px;background-position:65% bottom;background-color:#eef3f5;}
 .library-app .browse-shell .student-screen-head>div{width:100%;}
 .library-app .browse-shell .student-screen-head h1{font-size:2rem;}
 .library-app .browse-shell .student-screen-head p{max-width:100%;margin-top:8px;line-height:1.4;}
 .library-app .browse-shell .library-search{grid-template-columns:repeat(2,minmax(0,1fr));}
 .library-app .browse-shell .student-lesson-grid{gap:16px;}
}