/* A lesson as learners read it (2026-11-01, Digital Education Phase 2): the blocks includes/lessonview.php writes, and the
   page around them. Loaded after assets/app.css and built only from its colours (--color-*), so light and dark follow the
   site. Calm and readable first: one column, generous line height, nothing that moves. Used by the owner's preview in
   /admin now, and by the learner's lesson page in Phase 3. */

.lsn-page { margin: 0; font-family: Archivo, ui-sans-serif, system-ui, sans-serif; }
.lsn-skip { position: absolute; left: -9999px; top: 12px; z-index: 50; padding: 8px 16px; border-radius: 12px;
  background: var(--color-primary); color: var(--color-on-primary); font-weight: 600; }
.lsn-skip:focus { left: 12px; }
.lsn-sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* the preview's own bar (admin only) */
.lsn-bar { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--color-line); background: var(--color-surface); }
.lsn-bar-in { max-width: 72rem; margin: 0 auto; padding: 10px 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px;
  font-size: 0.875rem; color: var(--color-muted); }
.lsn-bar-tag { padding: 3px 10px; border-radius: 999px; background: var(--color-primary); color: var(--color-on-primary);
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.lsn-bar-what b { color: var(--color-ink); font-weight: 600; }
.lsn-bar-acts { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.lsn-bar-acts > a { color: var(--color-ink); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; padding: 10px 0; }
.lsn-theme { display: inline-flex; border: 1px solid var(--color-line-strong); border-radius: 999px; overflow: hidden; }
.lsn-theme button { min-height: 40px; padding: 0 14px; border: 0; background: transparent; color: var(--color-muted); font: inherit; cursor: pointer; }
.lsn-theme button[aria-pressed="true"] { background: var(--color-wash); color: var(--color-ink); font-weight: 600; }
.lsn-flash { max-width: 46rem; margin: 16px auto 0; padding: 12px 16px; border-radius: 12px; font-size: 0.95rem; }
.lsn-flash.is-ok { background: var(--color-ok-soft); color: var(--color-ink); }
.lsn-flash.is-err { background: var(--color-danger-soft); color: var(--color-ink); }

/* the lesson */
.lsn { max-width: 46rem; margin: 0 auto; padding: 28px 16px 24px; color: var(--color-body); font-size: 1.0625rem; line-height: 1.75; }
.lsn-crumbs { margin: 0 0 10px; font-size: 0.875rem; color: var(--color-muted); }
.lsn-title { margin: 0; color: var(--color-ink); font-size: clamp(1.75rem, 1.4rem + 1.4vw, 2.375rem); line-height: 1.2; font-weight: 700; letter-spacing: -0.01em; }
.lsn-lead { margin: 10px 0 0; font-size: 1.125rem; color: var(--color-muted); }
.lsn-access { margin: 20px 0 0; padding: 14px 18px; list-style: none; border: 1px solid var(--color-line); border-radius: 14px; background: var(--color-wash);
  font-size: 0.9375rem; line-height: 1.6; }
.lsn-access li + li { margin-top: 4px; }
.lsn-toc { margin: 16px 0 4px; }
.lsn-toc summary { display: inline-flex; align-items: center; min-height: 44px; cursor: pointer; color: var(--color-ink); font-weight: 600; }
.lsn-toc ol { margin: 6px 0 0; padding-left: 1.4em; columns: 2 16rem; column-gap: 2rem; font-size: 0.9375rem; list-style: decimal; }
.lsn-toc a { display: inline-block; padding: 6px 0; color: var(--color-body); text-underline-offset: 3px; }

.lsn-part { padding: 26px 0 8px; border-top: 1px solid var(--color-line); margin-top: 22px; scroll-margin-top: 64px; }
.lsn-part h2 { display: flex; align-items: center; gap: 12px; margin: 0 0 14px; color: var(--color-ink); font-size: 1.3125rem; line-height: 1.3; font-weight: 700; }
.lsn-part-n { flex: none; display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 999px; border: 1px solid var(--color-line-strong);
  background: var(--color-wash); font-size: 0.875rem; font-weight: 700; color: var(--color-ink); }
.lsn-part.is-empty { padding: 0; border: 0; margin-top: 14px; }
.lsn p { margin: 0 0 14px; }
.lsn strong { color: var(--color-ink); font-weight: 650; }
.lsn-h { margin: 22px 0 8px; color: var(--color-ink); font-size: 1.0625rem; font-weight: 700; }
.lsn-note { margin: 0 0 16px; padding: 12px 16px; border-left: 4px solid var(--color-line-strong); border-radius: 0 12px 12px 0; background: var(--color-wash); }
.lsn-note p { margin: 0; }
.lsn-math { margin: 0 0 16px; padding: 10px 16px; border-radius: 12px; background: var(--color-wash); color: var(--color-ink);
  font: 600 1.0625rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre-wrap; overflow-x: auto; }
.lsn-caption { margin: -6px 0 16px; font-size: 0.875rem; color: var(--color-muted); }
.lsn-list { margin: 0 0 16px; padding-left: 1.3em; list-style: disc; }
.lsn-list li::marker { color: var(--color-muted); }
.lsn-list li + li, .lsn-steps li + li { margin-top: 6px; }
.lsn-steps { margin: 0 0 16px; padding: 0; list-style: none; counter-reset: lsn-step; }
.lsn-steps li { position: relative; padding-left: 44px; min-height: 32px; counter-increment: lsn-step; }
.lsn-steps li::before { content: counter(lsn-step); position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 999px;
  background: var(--color-primary); color: var(--color-on-primary); font-size: 0.875rem; font-weight: 700; }

.lsn-table { margin: 0 0 16px; overflow-x: auto; border: 1px solid var(--color-line); border-radius: 14px; }
.lsn-table:focus-visible { outline: 2px solid var(--color-ink); outline-offset: 2px; }
.lsn-table table { width: 100%; border-collapse: collapse; font-size: 0.9875rem; line-height: 1.55; }
.lsn-table th, .lsn-table td { padding: 10px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--color-line); }
.lsn-table tr:last-child td { border-bottom: 0; }
.lsn-table th { background: var(--color-wash); color: var(--color-ink); font-weight: 650; }

.lsn-boxes { margin: 0 0 12px; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 10px; }
.lsn-boxes li { min-width: 56px; min-height: 56px; padding: 8px 14px; display: grid; place-items: center; border: 1.5px solid var(--color-line-strong);
  border-radius: 12px; background: var(--color-surface); color: var(--color-ink); font-size: 1.25rem; font-weight: 600; line-height: 1.2; text-align: center; }
.lsn-boxes li.is-mark { border: 3px solid var(--color-ink); background: var(--color-wash); box-shadow: 0 0 0 3px var(--color-wash); }
.lsn-boxes + :not(.lsn-boxes) { margin-top: 16px; }

.lsn-figure { margin: 0 0 16px; }
.lsn-figure img { display: block; max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--color-line); }
.lsn-figure figcaption { margin-top: 8px; font-size: 0.875rem; color: var(--color-muted); }

.lsn-tag { display: inline-block; margin-right: 8px; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--color-line-strong);
  background: var(--color-wash); color: var(--color-ink); font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  vertical-align: 2px; line-height: 1.6; }
.lsn-work, .lsn-try { margin: 0 0 16px; padding: 16px 18px; border: 1px solid var(--color-line); border-radius: 14px; background: var(--color-surface); }
.lsn-work p, .lsn-try p { margin: 0; }
.lsn-work-q, .lsn-try-q { color: var(--color-ink); }
.lsn-work-steps { margin: 12px 0 0; padding: 0; list-style: none; }
.lsn-work-steps li { padding: 8px 0 8px 2px; border-top: 1px dashed var(--color-line); }
.lsn-step { display: inline-block; min-width: 4.2em; color: var(--color-muted); font-size: 0.875rem; font-weight: 700; }
.lsn-work-a { margin-top: 12px !important; padding-top: 10px; border-top: 1px solid var(--color-line); }
.lsn-options { margin: 10px 0 0; padding-left: 1.8em; list-style: upper-alpha; }
.lsn-options li::marker { color: var(--color-muted); font-weight: 600; }
.lsn-options li + li { margin-top: 4px; }
.lsn-reveal { margin-top: 10px; }
.lsn-reveal summary { display: inline-flex; align-items: center; min-height: 44px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--color-line-strong);
  color: var(--color-ink); font-size: 0.9375rem; font-weight: 600; cursor: pointer; list-style: none; }
.lsn-reveal summary::-webkit-details-marker { display: none; }
.lsn-reveal summary::before { content: "+"; margin-right: 8px; font-weight: 700; }
.lsn-reveal[open] summary::before { content: "−"; }
.lsn-reveal > p { margin: 10px 0 0; padding: 10px 14px; border-radius: 12px; background: var(--color-wash); }
.lsn-reveal > p + p { margin-top: 6px; }

.lsn-files { margin: 0 0 16px; padding: 0; list-style: none; }
.lsn-files li { padding: 10px 0; border-top: 1px solid var(--color-line); }
.lsn-files a { color: var(--color-ink); font-weight: 600; text-underline-offset: 3px; }
.lsn-files span { margin-left: 8px; font-size: 0.875rem; color: var(--color-muted); }
.lsn-missing { margin: 0; padding: 10px 14px; border: 1px dashed var(--color-line-strong); border-radius: 12px; color: var(--color-muted); font-size: 0.9375rem; }
.lsn-missing b { color: var(--color-body); }

/* the preview's checking panel (admin only) */
.lsn-check { max-width: 46rem; margin: 8px auto 56px; padding: 22px 20px; border: 1px solid var(--color-line); border-radius: 18px; background: var(--color-surface);
  color: var(--color-body); line-height: 1.6; }
@media (max-width: 47.99rem) { .lsn-check { margin-left: 16px; margin-right: 16px; } }
.lsn-check h2 { margin: 0 0 8px; color: var(--color-ink); font-size: 1.25rem; font-weight: 700; }
.lsn-check p { margin: 0 0 14px; }
.lsn-check-row { margin: 0 0 18px; }
.lsn-btn { min-height: 46px; padding: 0 22px; border-radius: 999px; border: 1px solid var(--color-primary); background: var(--color-primary);
  color: var(--color-on-primary); font: 600 1rem/1 Archivo, ui-sans-serif, system-ui, sans-serif; cursor: pointer; }
.lsn-btn:hover { background: var(--color-primary-hover); }
.lsn-btn.is-quiet { background: transparent; color: var(--color-ink); border-color: var(--color-line-strong); }
.lsn-sendback { display: grid; gap: 8px; margin: 0 0 16px; padding-top: 16px; border-top: 1px solid var(--color-line); }
.lsn-sendback label { color: var(--color-ink); font-weight: 600; }
.lsn-sendback textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--color-line-strong); border-radius: 12px; background: var(--color-canvas);
  color: var(--color-ink); font: inherit; }
.lsn-sendback .lsn-btn { justify-self: start; }
.lsn-check-links { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 0 !important; }
.lsn-check-links a { display: inline-block; padding: 10px 0; color: var(--color-ink); font-weight: 600; text-underline-offset: 3px; }
:is(.lsn, .lsn-check, .lsn-bar) :focus-visible { outline: 2px solid var(--color-ink); outline-offset: 2px; border-radius: 6px; }

/* A lesson's quiz (2026-11-05, Digital Education Phase 4a): the card in the lesson, the questions, the result. */
.qz-card { padding: 18px 20px; border: 1px solid var(--color-line); border-radius: 16px; background: var(--color-surface); }
.qz-card-facts { margin: 0 0 12px !important; color: var(--color-muted); font-size: 0.9375rem; }
.qz-best { margin: 0 0 14px !important; font-size: 0.9375rem; }
.qz-best a, .qz-note a, .qz-back a { color: var(--color-ink); font-weight: 600; text-underline-offset: 3px; }
.qz-note { margin: 0 !important; color: var(--color-muted); font-size: 0.9375rem; }
.qz-start { margin: 0; }
.qz-kicker { margin: 0 0 6px; color: var(--color-muted); font-size: 0.8125rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.qz-rules { margin: 18px 0; padding-left: 1.3em; list-style: disc; }
.qz-rules li + li { margin-top: 6px; }
.qz-back { margin: 22px 0 0 !important; }
.qz-back a { display: inline-block; padding: 10px 0; }

.qz-form { margin-top: 20px; }
.qz-q { margin: 0 0 18px; padding: 18px 20px 20px; border: 1px solid var(--color-line); border-radius: 16px; background: var(--color-surface); min-width: 0; scroll-margin-top: 80px; }
.qz-q legend { display: flex; width: 100%; align-items: center; justify-content: space-between; gap: 12px; float: left; margin: 0 0 12px; padding: 0; }
.qz-q legend + * { clear: both; }
.qz-n { color: var(--color-ink); font-size: 0.875rem; font-weight: 700; }
.qz-diff { padding: 2px 10px; border-radius: 999px; border: 1px solid var(--color-line-strong); color: var(--color-muted); font-size: 0.75rem; font-weight: 600; }
.qz-case { clear: both; margin: 0 0 14px; padding: 12px 16px; border-left: 4px solid var(--color-line-strong); border-radius: 0 12px 12px 0; background: var(--color-wash); }
.qz-prompt { clear: both; margin: 0 0 14px !important; color: var(--color-ink); font-weight: 600; }
.qz-hint { margin: -6px 0 10px !important; color: var(--color-muted); font-size: 0.9375rem; }
.qz-opts { display: grid; gap: 10px; }
.qz-opt { display: flex; align-items: flex-start; gap: 12px; min-height: 48px; padding: 12px 14px; border: 1.5px solid var(--color-line-strong); border-radius: 12px;
  background: var(--color-canvas); color: var(--color-ink); line-height: 1.45; cursor: pointer; }
.qz-opt:hover { border-color: var(--color-ink); }
.qz-opt input { flex: none; width: 20px; height: 20px; margin: 1px 0 0; accent-color: var(--color-primary); cursor: pointer; }
.qz-opt:has(input:checked) { border-color: var(--color-ink); background: var(--color-wash); box-shadow: inset 0 0 0 1px var(--color-ink); }
.qz-opt:has(input:focus-visible) { outline: 2px solid var(--color-ink); outline-offset: 2px; }
.qz-typed { display: grid; gap: 6px; max-width: 20rem; color: var(--color-ink); font-weight: 600; font-size: 0.9375rem; }
.qz-typed input { min-height: 48px; padding: 0 14px; border: 1.5px solid var(--color-line-strong); border-radius: 12px; background: var(--color-canvas);
  color: var(--color-ink); font: 500 1.0625rem/1.4 Archivo, ui-sans-serif, system-ui, sans-serif; }
.qz-typed input:focus { border-color: var(--color-ink); outline: none; box-shadow: 0 0 0 3px var(--color-wash); }
.qz-submit { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; margin-top: 6px; padding: 18px 20px;
  border: 1px solid var(--color-line); border-radius: 16px; background: var(--color-wash); }
.qz-count { margin: 0 !important; color: var(--color-body); font-size: 0.9375rem; }

.qz-score { margin-top: 20px; padding: 22px 22px 18px; border: 1px solid var(--color-line); border-radius: 18px; background: var(--color-surface); scroll-margin-top: 80px; }
.qz-big { margin: 0; color: var(--color-ink); font-size: 1.25rem; font-weight: 600; }
.qz-big b { font-size: 2.5rem; font-weight: 800; letter-spacing: -0.02em; margin-right: 4px; }
.qz-say { margin: 6px 0 14px !important; color: var(--color-body); }
.qz-figs { display: grid; grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr)); gap: 10px; margin: 16px 0 0; }
.qz-figs > div { display: flex; flex-direction: column-reverse; gap: 2px; padding: 10px 12px; border-radius: 12px; background: var(--color-wash); }
.qz-figs dt { color: var(--color-muted); font-size: 0.8125rem; }
.qz-figs dd { margin: 0; color: var(--color-ink); font-size: 1.125rem; font-weight: 700; }
.qz-figs-note { margin: 12px 0 0 !important; color: var(--color-muted); font-size: 0.875rem; }
.qz-topics, .qz-review { margin-top: 28px; }
.qz-topics h2, .qz-review h2 { margin: 0 0 12px; color: var(--color-ink); font-size: 1.1875rem; font-weight: 700; }
.qz-topics ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.qz-topics li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 14px; align-items: center; }
.qz-topics .meter { grid-column: 1 / -1; grid-row: 2; }
.qz-topic-name { color: var(--color-ink); font-weight: 600; font-size: 0.9375rem; }
.qz-topic-n { text-align: right; color: var(--color-muted); font-size: 0.875rem; white-space: nowrap; }
.qz-weak { margin-left: 6px; padding: 1px 8px; border-radius: 999px; background: var(--color-warn-soft); color: var(--color-ink); font-size: 0.75rem; font-weight: 600; }
.qz-review ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.qz-item { padding: 16px 18px; border: 1px solid var(--color-line); border-left-width: 4px; border-radius: 14px; background: var(--color-surface); }
.qz-item.is-right { border-left-color: var(--color-ok); }
.qz-item.is-wrong { border-left-color: var(--color-danger); }
.qz-item.is-skipped { border-left-color: var(--color-line-strong); }
.qz-item p { margin: 0 0 8px; }
.qz-item-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.qz-mark { display: inline-flex; align-items: center; gap: 4px; padding: 2px 10px; border-radius: 999px; font-size: 0.8125rem; font-weight: 700; color: var(--color-ink); }
.is-right .qz-mark { background: var(--color-ok-soft); }
.is-wrong .qz-mark { background: var(--color-danger-soft); }
.is-skipped .qz-mark { background: var(--color-wash); }
.qz-line span { display: inline-block; min-width: 7.5rem; color: var(--color-muted); font-size: 0.875rem; }
.qz-why { margin-top: 10px; padding: 10px 14px; border-radius: 12px; background: var(--color-wash); color: var(--color-body); }
.qz-after { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 8px; }
.qz-link { display: inline-flex; align-items: center; text-decoration: none; }
.qz .meter { height: 8px; overflow: hidden; border-radius: 999px; background: var(--color-wash); box-shadow: inset 0 0 0 1px var(--color-line); }
.qz .meter > span { display: block; height: 100%; border-radius: 999px; background: var(--color-ink); }
@media (max-width: 47.99rem) {
  .qz-q, .qz-submit, .qz-score { padding-left: 16px; padding-right: 16px; }
  .qz-submit .lsn-btn, .qz-after .lsn-btn { width: 100%; justify-content: center; }
  .qz-line span { display: block; min-width: 0; }
}
:is(.qz) :focus-visible { outline: 2px solid var(--color-ink); outline-offset: 2px; border-radius: 6px; }

/* the owner's preview of a lesson's quiz questions (admin/lesson-preview.php) */
.lsn-qlist { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.lsn-qitem { padding: 16px 18px; border: 1px solid var(--color-line); border-radius: 14px; background: var(--color-surface); scroll-margin-top: 80px; }
.lsn-qhead { margin: 0 0 10px !important; color: var(--color-muted); font-size: 0.875rem; }
.lsn-options li.is-right { color: var(--color-ink); font-weight: 600; }
.lsn-qwhy { margin: 10px 0 0 !important; padding: 10px 14px; border-radius: 12px; background: var(--color-wash); }
.lsn-qacts { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; margin-top: 12px; }
.lsn-qacts form { margin: 0; }
.lsn-qacts a { color: var(--color-ink); font-weight: 600; text-underline-offset: 3px; padding: 10px 0; }

/* a test (Phase 4b): its facts, the clock, sections, pass or not */
.ts-facts { margin: 16px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.ts-facts li { padding: 6px 12px; border-radius: 999px; background: var(--color-wash); color: var(--color-ink); font-size: 0.9375rem; line-height: 1.4; }
.ts-dates { margin: 12px 0 0 !important; color: var(--color-muted); font-size: 0.9375rem; }
.ts-instructions { margin-top: 16px; }
.ts-locked { margin: 8px 0 0; padding: 18px 20px; }
.ts-locked p { margin: 0; }
.ts-clock { position: sticky; top: 64px; z-index: 15; display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; margin: 18px 0 0; padding: 12px 16px;
  border: 1px solid var(--color-line); border-radius: 14px; background: var(--color-surface); box-shadow: 0 6px 18px -12px rgba(0, 0, 0, 0.35); color: var(--color-muted); font-size: 0.9375rem; }
.ts-clock b { color: var(--color-ink); font-size: 1.375rem; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.ts-clock.is-low { border-color: var(--color-danger); }
.ts-clock.is-low b { color: var(--color-danger); }
.ts-saved { margin-left: auto; font-size: 0.8125rem; }
.ts-section { margin: 26px 0 12px; color: var(--color-ink); font-size: 1.1875rem; font-weight: 700; }
.ts-pass { margin: 8px 0 14px !important; padding: 8px 14px; border-radius: 12px; font-weight: 600; color: var(--color-ink); }
.ts-pass.is-pass { background: var(--color-ok-soft); }
.ts-pass.is-fail { background: var(--color-warn-soft); }
.ts-later { margin-bottom: 0 !important; }

/* My Learning's Save button (Phase 5; its look is in assets/app.css: .lr-save-btn): under Mark as done, and under each
   question of a quiz or test result */
.lsn-save { margin: 0 0 18px; }
.qz-save { margin-top: 12px; }
.qz-item { scroll-margin-top: 90px; }