/* A compact lesson picker and an uninterrupted reading area. */
.lesson-course-context{margin-bottom:12px;min-width:0;overflow-wrap:anywhere}
.lesson-course-context h1{font-size:1.3rem;margin:0 0 5px;letter-spacing:-.02em}
.lesson-course-context p{font-size:.88rem;color:var(--muted);margin:0}
.lesson-course-context label{margin-top:0}
.lesson-course-context .row>div{min-width:0}
.course-grading-summary{border:1px solid #e0e4ea;border-radius:8px;background:#fff;margin:0 0 18px;overflow:hidden}
.course-grading-summary>summary{padding:11px 15px;color:#536273;font-size:.85rem;font-weight:600}
.course-grading-summary>.grading-guide{border:0;border-top:1px solid #e0e4ea;border-radius:0;margin:0}
.lesson-layout{align-items:start;gap:22px}
.lesson-layout>section,.lesson-sidebar,.lesson-reader{min-width:0}
.lesson-sidebar{position:sticky;top:14px}
.lesson-navigation{margin:0;border:1px solid #dce3eb;border-radius:10px;background:#fff;overflow:hidden}
.lesson-navigation>summary{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:10px;padding:16px;list-style:none;background:#fff;color:#263d50;line-height:1.4;min-height:54px}
.lesson-navigation>summary::-webkit-details-marker{display:none}
.lesson-navigation-title{font-size:.93rem;font-weight:700;overflow-wrap:anywhere}
.lesson-navigation-count{display:inline-block;border-radius:20px;padding:3px 9px;background:#f8edf0;color:#97162b;font-size:.76rem;font-variant-numeric:tabular-nums;font-weight:700;white-space:nowrap}
.lesson-navigation-chevron,.lesson-navigation-icon{display:inline-block;color:#97162b;transition:transform .15s ease}
.lesson-navigation[open]>summary .lesson-navigation-chevron,.lesson-navigation[open]>summary .lesson-navigation-icon{transform:rotate(180deg)}
.lesson-navigation-body{padding:0 10px 10px;border-top:1px solid #e7ebf0;max-height:calc(100dvh - 105px);overflow-y:auto;overflow-wrap:anywhere;overscroll-behavior:contain;scrollbar-width:thin}
.lesson-navigation-body>.module-outline:first-child{margin-top:10px}
.lesson-navigation-body>.panel:last-child{margin:12px 0 0;padding:14px;background:#f8fafc}
.lesson-navigation-body .module-outline{margin-bottom:10px;border-radius:7px}
.lesson-navigation-body .module-outline>summary{font-size:.88rem;padding:12px;line-height:1.45}
.lesson-navigation-body .module-outline>summary>span{overflow-wrap:anywhere}
.lesson-navigation-body .lesson{font-size:.88rem;line-height:1.5;padding:12px;min-height:48px;overflow-wrap:anywhere;font-weight:550}
.lesson-navigation-body .lesson small{font-size:.72rem;line-height:1.4;margin-top:4px}
.lesson-navigation-body .lesson[aria-current=step]{font-weight:700}
.module-about{margin:0;padding:0 12px;border-top:1px solid #e5eaf0;background:#fff}
.module-outline .module-about>summary{background:transparent;padding:10px 0;font-size:.76rem;color:#6a4050;font-weight:600;line-height:1.5}
.module-about .module-description{padding:0;margin:0 0 13px;line-height:1.7;overflow-wrap:anywhere}
.lesson-reader{padding:24px;scroll-margin-top:16px;outline-offset:4px}
.lesson-heading{display:block;background:transparent;color:inherit;padding:0;margin-bottom:18px}
.lesson-heading .eyebrow{display:block;letter-spacing:.08em;line-height:1.7;overflow-wrap:anywhere}
.lesson-position{display:inline-block;font-size:.76rem;font-variant-numeric:tabular-nums;color:#697888;white-space:nowrap}
.lesson-heading h2{font-size:clamp(1.25rem,2.2vw,1.7rem);line-height:1.4;margin:8px 0 10px;overflow-wrap:anywhere;letter-spacing:-.02em;scroll-margin-top:20px}
.lesson-heading .lesson-status{margin-bottom:0;padding-bottom:14px}
.lesson-tabs{position:sticky;top:0;z-index:6;display:flex;gap:4px;padding:7px 0;margin:0 0 12px;border:0;border-bottom:1px solid #e1e6ed;background:#fff;box-shadow:0 6px 9px -8px #263d502b;flex-wrap:nowrap}
.lesson-tabs button{flex:1;min-width:0;min-height:46px;padding:10px 12px;border:1px solid transparent;border-radius:7px;background:#f4f6f9;color:#5a6978;font-size:.88rem;line-height:1.35;white-space:nowrap}
.lesson-tabs button[aria-selected=true]{background:#97162b;border-color:#97162b;color:#fff;font-weight:700}
.lesson-tabs button:focus-visible{position:relative;z-index:1}
.lesson-pane{min-width:0;scroll-margin-top:80px}
.lesson-pane[hidden]{display:none!important}
.lesson-pane .table-scroll{max-width:100%}
.lesson-pane .rubric-summary{min-width:0;max-width:100%;overflow-x:auto}
.lesson-pane .lecture{padding:20px;font-size:17px;line-height:1.85;overflow-wrap:anywhere}
.lesson-pane>.actions{margin-bottom:18px}
.lesson-pane h3{margin-top:18px;line-height:1.45}
.lesson-pane>.pre{font-size:1rem;line-height:1.8}
.lesson-pane form[data-form=submission]{margin-top:18px}
.lesson-pane form[data-form=submission] textarea{min-height:180px;line-height:1.65}
.lesson-pane form[data-form=submission]>button{min-height:46px;margin-top:14px}
.lesson-pane form[data-form=submission]>small{margin-top:10px;line-height:1.6}
.lesson-pagination{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px;margin:0 0 20px}
.lesson-pagination>button{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:4px;min-width:0;min-height:60px;padding:11px 13px;border:1px solid #e0e5ec;border-radius:8px;background:#fff;color:#4b5d70;line-height:1.35;text-align:left;font-size:.8rem}
.lesson-pagination>button:last-child{align-items:flex-end;text-align:right}
.lesson-pagination>button small{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;color:#7a8796;font-size:.72rem;font-weight:400;line-height:1.4;overflow-wrap:anywhere}
.lesson-pagination>button:not(:disabled):hover{border-color:#bc7784;background:#fcf5f7;color:#97162b}
.lesson-pagination>button:disabled{opacity:.42;cursor:default}

@media(max-width:1020px) and (min-width:761px){
 .lesson-layout{grid-template-columns:245px minmax(0,1fr);gap:16px}
 .lesson-reader{padding:20px}
 .lesson-tabs button{padding:10px 8px;font-size:.8rem}
}

@media(max-width:760px){
 .course-tabs{display:flex;flex-wrap:nowrap;overflow-x:auto;gap:0;margin-bottom:14px;scrollbar-width:thin;-webkit-overflow-scrolling:touch}
 .course-tabs>button{flex:0 0 auto;min-height:44px;padding:10px 13px;font-size:.8rem}
 .lesson-course-context{padding:14px;margin-bottom:10px}
 .lesson-course-context h1{font-size:1.1rem;line-height:1.4}
 .lesson-course-context p{font-size:.8rem;line-height:1.5}
 .lesson-course-context label{font-size:.8rem;margin-bottom:10px}
 .lesson-course-context input,.lesson-course-context select{min-height:44px;font-size:16px}
 .course-grading-summary{margin-bottom:12px}
 .course-grading-summary>summary{min-height:44px;padding:11px 13px}
 .lesson-layout{grid-template-columns:minmax(0,1fr);gap:12px}
 .lesson-sidebar{position:static}
 .lesson-navigation>summary{padding:13px 14px;min-height:54px}
 .lesson-navigation-title{font-size:.9rem}
 .lesson-navigation-body{max-height:60vh;max-height:60dvh;padding:0 8px 8px}
 .lesson-navigation-body .lesson{font-size:.9rem;min-height:48px}
 .lesson-reader{padding:16px;margin-bottom:0;scroll-margin-top:10px}
 .lesson-heading{margin-bottom:12px}
 .lesson-heading h2{font-size:1.3rem;line-height:1.45;margin:7px 0 10px}
 .lesson-heading .eyebrow{font-size:.62rem;letter-spacing:.06em}
 .lesson-heading .badge{font-size:.68rem}
 .lesson-heading .lesson-status p{font-size:.8rem;line-height:1.6}
 .lesson-tabs{gap:4px;margin:0 -3px 10px;padding:7px 3px;top:0}
 .lesson-tabs button{min-height:44px;padding:10px 7px;font-size:.8rem}
 .lesson-pagination{gap:7px;margin-bottom:16px}
 .lesson-pagination>button{min-height:58px;padding:9px 10px;font-size:.76rem}
 .lesson-pagination>button small{font-size:.69rem}
 .lesson-pane .lecture{padding:13px;font-size:17px;line-height:1.8}
 .lesson-pane>.pre{font-size:1rem;line-height:1.75}
 .lesson-pane input,.lesson-pane textarea,.lesson-pane select{font-size:16px;min-height:44px;max-width:100%}
 .lesson-pane input[type=checkbox],.lesson-pane input[type=radio]{min-height:0}
 .lesson-pane button,.lesson-pane .file-chip button{min-height:44px}
 .lesson-pane form[data-form=submission]>button{width:100%}
 .lesson-pane .deadline-strip{padding:12px;font-size:.8rem}
 .lesson-pane .rubric-summary{padding:12px}
 .lesson-pane .rubric-summary table{font-size:.83rem}
}

@media(prefers-reduced-motion:reduce){
 .lesson-navigation-chevron,.lesson-navigation-icon{transition:none}
 .lesson-reader,.lesson-pane{scroll-behavior:auto}
}

@media print{
 .lesson-sidebar,.lesson-tabs,.lesson-pagination,.course-grading-summary{display:none!important}
 .lesson-layout{display:block}
 .lesson-reader{padding:0;border:0}
 .lesson-pane,.lesson-pane[hidden]{display:block!important}
 .lesson-pane .lecture{background:#fff;padding:0;font-size:11pt;line-height:1.6}
 .lesson-heading h2{font-size:16pt}
 .lesson-course-context{padding:0}
}