/* Shared lesson presentation, based on the Datorika 9 reading layout. */
.course-lesson { padding: 0; font-size: 17px; line-height: 1.65; }
.course-lesson .course-content { max-width: 880px; margin: 0 auto; padding: 32px 24px 64px; }
.course-lesson h1 { max-width: 30ch; font-size: clamp(28px, 4vw, 40px); line-height: 1.2; }
.course-lesson h2 { font-size: clamp(23px, 3vw, 29px); line-height: 1.3; margin: 0 0 18px; }
.course-lesson h3 { font-size: 21px; line-height: 1.4; }
.course-lesson p, .course-lesson li { max-width: 76ch; }
.course-lesson .course-content > section { margin: 32px 0; padding: 26px 0; border-top: 1px solid var(--line); }
.course-lesson .course-topbar { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; max-width: 1050px; margin: auto; padding: 18px 24px; border-bottom: 1px solid var(--line); }
.course-lesson .course-topbar nav { display: flex; flex-wrap: wrap; gap: 20px; }
.course-lesson .course-topbar a { min-height: 32px; }
.course-lesson .sidebar-nav { top: 0; height: 100dvh; }
.course-lesson .sidebar-nav h3 { font-size: 19px; }
.course-lesson .breadcrumb { color: var(--muted); font-size: 15px; }
.course-lesson .lesson-goal { font-size: 20px; line-height: 1.55; }
.course-lesson .project-note { border-left: 4px solid var(--success); padding: 10px 14px; background: var(--surface); }
.course-lesson .course-content > .lesson-task { padding: 24px; border: 1px solid var(--line); border-left: 4px solid var(--accent-strong); border-radius: 8px; background: var(--surface); }
.course-lesson .html-tags table { width: 100%; table-layout: fixed; white-space: normal; }
.course-lesson .html-tags th, .course-lesson .html-tags td { white-space: normal; overflow-wrap: anywhere; }
.course-lesson .workplace { background: var(--surface); border-left: 4px solid var(--accent-strong); padding: 10px 14px; font-weight: 600; }
.course-lesson .task-number { color: var(--accent-strong); font-weight: 600; margin: 0 0 8px; }
.course-lesson .step-list { padding-left: 30px; margin: 22px 0; }
.course-lesson .step-list li { margin: 0 0 20px; padding-left: 8px; }
.course-lesson .step-list li::marker { color: var(--accent-strong); font-weight: bold; }
.course-lesson .step-check { width: 20px; height: 20px; margin: 0 10px 0 0; vertical-align: middle; accent-color: #ffb142; cursor: pointer; }
.course-lesson .step-progress { color: var(--muted); font-size: 15px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.course-lesson .step-progress button { color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: 6px 10px; background: var(--surface); font: inherit; cursor: pointer; }
.course-lesson .done-when { padding: 16px; font-size: 17px; }
.course-lesson .submission { margin-top: 28px; padding: 20px; border: 2px solid var(--success); border-radius: 8px; background: var(--surface); }
.course-lesson .submission h3 { margin-top: 0; }
.course-lesson .assessment-checks li { margin-bottom: 12px; }
.course-lesson .course-help, .course-lesson .starter-source { margin: 20px 0; padding: 16px 20px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.course-lesson summary { cursor: pointer; font-weight: 600; padding: 4px 0; }
.course-lesson details[open] > summary { margin-bottom: 18px; }
.course-lesson .starter-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.course-lesson .starter-actions button { cursor: pointer; }
.course-lesson .copy-status { min-height: 1.6em; margin: 8px 0; color: var(--success); }
.course-lesson pre { max-width: 100%; padding: 18px; overflow-x: auto; background: #171d24; color: #f2f4f8; border: 1px solid var(--line); border-radius: 6px; font-size: 15px; line-height: 1.65; white-space: pre; }
.course-lesson pre code { padding: 0; border: 0; color: inherit; background: none; font-size: inherit; }
.course-lesson :not(pre) > code { overflow-wrap: anywhere; }
.course-lesson .starter-source pre { max-height: 520px; }
.course-lesson .course-footer { padding: 24px; text-align: center; border-top: 1px solid var(--line); }
.course-lesson .skip-link { position: absolute; top: -100px; left: 16px; background: var(--surface); color: var(--text); padding: 12px; z-index: 10; }
.course-lesson .skip-link:focus { top: 8px; }
.course-lesson :is(a, button, input, summary):focus-visible { outline: 3px solid var(--accent-strong); outline-offset: 4px; }
.course-lesson [id] { scroll-margin-top: 20px; }
.course-lesson .code-example { grid-template-columns: minmax(0, 1fr); }
.course-lesson .code-example > * { min-width: 0; }
.course-lesson .table-scroll { max-width: 100%; overflow-x: auto; margin: 20px 0; }
.course-lesson .table-scroll table { margin: 0; }
.course-lesson .table-scroll:focus-visible { outline: 3px solid var(--accent-strong); outline-offset: 4px; }
.course-lesson .course-content { overflow-wrap: break-word; }
.course-lesson .course-content img, .course-lesson .course-content video { max-width: 100%; height: auto; }
body.course-lesson > .skip-link { position: absolute; z-index: 50; }
@media (max-width: 760px) {
  .course-lesson .sidebar-nav { top: auto; height: auto; margin: 16px 16px 0; }
}
@media (max-width: 600px) {
  .course-lesson .course-content { padding: 24px 16px 48px; }
  .course-lesson .course-help, .course-lesson .starter-source { padding: 12px; }
  .course-lesson .submission { padding: 16px; }
  .course-lesson .course-content > .lesson-task { padding: 18px 14px; }
  .course-lesson .html-tags table { display: table; }
}
@media print {
  body.page-reference.course-lesson.has-sidebar { padding-left: 0; }
  .course-lesson .sidebar-nav { display: none; }
  .course-lesson .course-topbar, .course-lesson .starter-actions, .course-lesson .step-progress, .course-lesson .course-footer { display: none; }
  .course-lesson .course-content { max-width: none; padding: 0; }
  .course-lesson .lesson-task { break-inside: avoid; }
}