/* Auburn marks the course structure. Ink carries the material being studied. */
:root {
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-ui: Arial, Helvetica, sans-serif;
  --brand-red: #9a2f06;
  --brand-red-light: #f6e9e3;
  --text-body: 1.125rem;
  --reading-measure: 70ch;
}

.t216.design-system { font-family: var(--font-ui); font-size: var(--text-body); line-height: 1.65; }
.t216.design-system main { min-width: 0; }
.t216.design-system main p { font-size: var(--text-body); line-height: 1.65; max-width: var(--reading-measure); }
.t216.design-system main :is(p, li, dd, h1, h2, h3, h4) { overflow-wrap: break-word; }
.t216.design-system main :is(input, select, button) { max-width: 100%; }
.t216.design-system main select { text-overflow: ellipsis; }

.t216.design-system main .design-page-title {
  font: 700 clamp(2rem, 3vw, 2.5rem)/1.2 var(--font-serif);
  color: var(--brand-red); letter-spacing: -.025em; margin: 0 0 1.15rem;
}
.t216.design-system main .design-question-title {
  font: 400 clamp(2rem, 3vw, 2.75rem)/1.22 var(--font-serif);
  color: var(--ink); letter-spacing: -.02em; margin: 1rem 0 1.1rem; max-width: 46ch;
}
.t216.design-system main .design-section-title {
  font: 700 clamp(1.625rem, 2vw, 1.75rem)/1.3 var(--font-serif);
  color: var(--brand-red); letter-spacing: -.02em; margin: 0 0 1rem;
}
.t216.design-system main .design-subsection-title {
  font: 700 1.2rem/1.4 var(--font-ui); color: var(--ink);
  letter-spacing: normal; margin: 0 0 .65rem;
}
.t216.design-system main :is(.design-label, .instruction-label, .notebook-lane-title) {
  font: 700 1rem/1.5 var(--font-ui); color: var(--ink);
  letter-spacing: normal; margin: 0 0 .6rem;
}
.t216.design-system main :is(.design-card-title, .design-content-question) {
  font: 400 clamp(1.25rem, 1.8vw, 1.5rem)/1.45 var(--font-serif);
  color: var(--ink); letter-spacing: -.01em; margin: 0 0 .7rem;
}
.t216.design-system main .design-word-title {
  font: 400 1.5rem/1.4 var(--font-serif); color: var(--ink);
  letter-spacing: -.01em; margin: 0 0 .55rem;
}
.t216.design-system main .matrix-word-heading .design-word-title {
  font-size: clamp(1.75rem, 2.5vw, 2.25rem); margin: 0;
}
.t216.design-system .pos-label { font: 400 1rem/1.5 var(--font-ui); color: var(--muted); }

/* Supporting sentences stay quieter than the numbered landing headings. */
.t216.design-system .landing-path .path-step {
  font: 700 clamp(1.65rem, 2.3vw, 2rem)/1.25 var(--font-serif);
  color: var(--brand-red); letter-spacing: -.025em; margin: 0 0 .85rem;
}
.t216.design-system .landing-path .path-description {
  font: 400 clamp(1.2rem, 1.7vw, 1.5rem)/1.5 var(--font-ui);
  color: var(--ink); letter-spacing: normal; margin: 0 0 1.1rem; max-width: none;
}
.t216.design-system .landing-title .design-page-title { color: #000; margin-bottom: 1.2rem; }
.t216.design-system .landing-big-questions .big-question .design-content-question { margin: 0; }
.t216.design-system .landing-path :is(label, .path-link) { font-size: 1.125rem; }
.t216.design-system .landing-path label { color: #000; font-weight: 700; }

/* Practice collections use the same quiet rules and auburn section headings. */
.t216.design-system .hub-links { display: flex; flex-wrap: wrap; gap: .6rem 1.25rem; padding: .8rem 0; margin: 1rem 0 1.5rem; border-block: 1px solid var(--line); font-size: 1rem; }
.t216.design-system .hub-links a { padding-block: .35rem; }
.t216.design-system .hub-section { border-top: 1px solid var(--line); padding-top: 1.5rem; margin-top: 2rem; scroll-margin-top: 5.5rem; }
.t216.design-system .blooket-release-note { color: var(--muted); font-size: 1rem; }
.t216.design-system .blooket-chapter { border-bottom: 1px solid var(--line); padding: .5rem 0; }
.t216.design-system .blooket-chapter>summary { cursor: pointer; padding: .65rem .25rem; font-size: 1.125rem; line-height: 1.5; }
.t216.design-system .blooket-chapter>summary>span { margin-right: .7rem; font-size: 1rem; }
.t216.design-system .blooket-chapter>summary>strong { font-weight: 400; }
.t216.design-system .blooket-chapter[open]>summary>strong { font-weight: 700; }
.t216.design-system .blooket-chapter>summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.t216.design-system .blooket-list { padding: 0; margin: .5rem 0 1rem; list-style: none; }
.t216.design-system .blooket-list>li { display: flex; justify-content: space-between; align-items: baseline; gap: .5rem 1.5rem; padding: .85rem 0; border-top: 1px solid var(--line); font-size: 1rem; }
.t216.design-system .blooket-list strong { font-weight: 400; }
.t216.design-system .blooket-count { display: block; margin-top: .2rem; font-size: .875rem; color: var(--muted); }
.t216.design-system .blooket-pending { font-size: .875rem; color: var(--muted); white-space: nowrap; }
.t216.design-system .blooket-play { white-space: nowrap; padding-block: .3rem; }
.t216.design-system .blooket-challenge-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 2rem; }
.t216.design-system .blooket-preparation { font-size: 1rem; }
.t216.design-system .act-reading-page { max-width: 64rem; }
.t216.design-system .act-actions { padding-left: 1.4rem; max-width: 70ch; }
.t216.design-system .act-actions li { margin: .8rem 0; }
.t216.design-system .gist-example { margin: 1.5rem 0; }
.t216.design-system .gist-example table { width: 100%; border-collapse: collapse; font-size: 1rem; }
.t216.design-system .gist-example caption { text-align: left; font-size: .875rem; color: var(--muted); margin-bottom: .6rem; }
.t216.design-system .gist-example :is(th,td) { text-align: left; vertical-align: top; padding: .8rem; border: 1px solid var(--line); }
.t216.design-system .gist-example th { background: #edf3f7; }
.t216.design-system .gist-example td:last-child { width: 10rem; font-family: var(--font-serif); font-size: 1.2rem; }
@media (max-width: 700px) {
  .t216.design-system .blooket-challenge-grid { grid-template-columns: minmax(0, 1fr); }
  .t216.design-system .blooket-list>li { flex-wrap: wrap; }
  .t216.design-system .blooket-chapter>summary>span { display: block; margin-left: 1rem; }
  .t216.design-system .gist-example :is(th,td) { padding: .6rem; }
  .t216.design-system .gist-example td:last-child { width: 7rem; font-size: 1.1rem; }
}

/* The selected aim leads the reader; the controls remain compact and explicit. */
.t216.design-system .reader-reading-focus { margin: 0 0 1.25rem; }
.t216.design-system .reader-controls { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 1rem 1.5rem; }
.t216.design-system .reading-aim-filter { margin: 0; min-width: 0; }
.t216.design-system .reading-aim-filter label { display: block; font: 700 1rem/1.5 var(--font-ui); color: #000; margin: 0 0 .4rem; }
.t216.design-system .reading-aim-filter select { min-height: 2.75rem; font: 400 1rem/1.5 var(--font-ui); padding: .6rem; border-color: #8da3b5; border-radius: 3px; }
.t216.design-system .highlight-control { display: flex; flex-direction: column; align-items: center; gap: .2rem; }
.t216.design-system #highlight-status { font: 400 .875rem/1.5 var(--font-ui); color: var(--ink); white-space: nowrap; }
.t216.design-system .highlight-switch { display: inline-flex; justify-content: center; align-items: center; width: 4rem; height: 2.75rem; min-height: 2.75rem; padding: 0; margin: 0; border: 0; border-radius: 1.5rem; background: transparent; touch-action: manipulation; }
.t216.design-system .highlight-track { position: relative; display: block; width: 3.5rem; height: 2rem; border-radius: 1rem; background: #b83a32; box-shadow: inset 0 1px 3px #0003; transition: background-color .18s ease; }
.t216.design-system .highlight-track::before { content: ''; position: absolute; top: .2rem; left: .2rem; width: 1.6rem; height: 1.6rem; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px #0005; transition: transform .18s ease; }
.t216.design-system .highlight-switch[aria-checked=true] .highlight-track { background: #228344; }
.t216.design-system .highlight-switch[aria-checked=true] .highlight-track::before { transform: translateX(1.5rem); }
.t216.design-system .reader-active-aim { margin: 1.2rem 0 1rem; }
.t216.design-system .reader-highlight-help { margin-top: .75rem; }
.t216.design-system .reader-highlight-help .highlight-hint,
.t216.design-system .reader-highlight-help .reading-aim-empty { font: 400 1rem/1.5 var(--font-ui); margin: .5rem 0 0; }
html[data-highlights=off] .reader-highlight-help { display: none; }
.t216.design-system.reader-page .chapter-audio { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: .75rem; padding: .35rem .65rem; margin: 1rem 0; }
.t216.design-system.reader-page .chapter-audio .audio-heading-row { display: flex; flex-direction: column; align-items: flex-start; gap: 0; margin: 0; }
.t216.design-system.reader-page .chapter-audio .design-label { margin: 0; font-size: .875rem; }
.t216.design-system.reader-page .audio-player { height: 64px; display: block; border: 0; }
.t216.design-system.reader-page .audio-duration { font-size: .875rem; }
@media (max-width: 650px) {
  .t216.design-system .reader-controls { grid-template-columns: minmax(0, 1fr); gap: .6rem; }
  .t216.design-system .highlight-control { align-items: flex-start; }
  .t216.design-system.reader-page .chapter-audio { grid-template-columns: minmax(0, 1fr); gap: .15rem; padding: .4rem .6rem; }
  .t216.design-system.reader-page .chapter-audio .audio-heading-row { flex-direction: row; justify-content: space-between; gap: .5rem; }
}
@media (prefers-reduced-motion: reduce) {
  .t216.design-system .highlight-track, .t216.design-system .highlight-track::before { transition: none; }
}
@media print {
  .t216.design-system .reader-controls, .t216.design-system .reader-highlight-help { display: none; }
}

/* Keep the complete aim, its gist, and the student's controls close together. */
.t216.design-system .weekly-gist { max-width: 72ch; margin: 0 0 1.65rem; }
.t216.design-system .weekly-gist-text {
  font: 400 clamp(1.25rem, 1.5vw, 1.375rem)/1.6 var(--font-ui);
  color: var(--ink); margin: 0; max-width: 70ch;
}
.t216.design-system .weekly-gist-label { font: 700 1rem/1.5 var(--font-ui); color: var(--muted); margin: 0 0 .4rem; }
.t216.design-system .week-selection select { font-size: 1.125rem; min-height: 3.5rem; padding: .75rem .85rem; }
.t216.design-system .study-banner { height: 6rem; margin: 0 0 1.5rem; }
.t216.design-system :is(.organizer, .writing-page>section, .vocabulary-tier, .idea-directory-lesson) { margin-top: 2rem; }
.t216.design-system .organizer-heading { margin-bottom: 1rem; }
.t216.design-system .vocabulary-tier { border-top: 1px solid var(--line); padding-top: 1.5rem; }
.t216.design-system .vocabulary-tier:first-of-type { margin-top: 1.5rem; }

/* These explanations do essential teaching work; they are not fine print. */
.t216.design-system :is(.word-definition, .gloss-row>p, .venn-explanation>p) {
  font: 400 var(--text-body)/1.7 var(--font-ui); max-width: var(--reading-measure);
}
.t216.design-system :is(.notebook-node p, .margin-gloss, .matrix-directions, .matrix-spelling, .quadrant-task, .frame-direction) {
  font: 400 1rem/1.65 var(--font-ui);
}
.t216.design-system .notebook-node p { margin: 0; }
.t216.design-system .margin-gloss { color: var(--ink); }
.t216.design-system .matrix-part small { font-size: .875rem; line-height: 1.5; }
.t216.design-system .matrix-column .design-label { margin: .35rem 0 .65rem; }
.t216.design-system .matrix-example .design-label,
.t216.design-system .matrix-general-example .design-label { font-size: 1rem; }
.t216.design-system .matrix-family-heading .design-word-title { margin: 0; }
.t216.design-system .matrix-header { flex-wrap: wrap; }
.t216.design-system :is(.concept-check legend, .check-feedback, .practice-feedback, .word-example, .practice-question) { font-size: 1rem; line-height: 1.65; }

/* Preserve comfortable reading type and the meaning of instructional colors. */
.t216.design-system.reader-page .prose { font: 400 1.25rem/1.8 var(--font-serif); }
.t216.design-system.reader-page .prose .passage-text>p { font: inherit; max-width: var(--reading-measure); }
.t216.design-system.reader-page .prose .design-reading-title {
  font: 400 1.5rem/1.4 var(--font-serif); color: var(--ink);
  letter-spacing: -.01em; margin: 1.6rem 0 1rem;
}
.t216.design-system.reader-page .prose .design-reading-title:first-child { margin-top: 0; }
.t216.design-system.reader-page .prose .margin-note p { font: 400 1rem/1.65 var(--font-ui); }
.t216.design-system.reader-page .margin-note .design-label { font-size: 1rem; margin: .3rem 0; }
.t216.design-system .model-paragraph { font: 400 1.25rem/1.85 var(--font-serif); max-width: 65ch; }
.t216.design-system .matrix-example>p:not(.matrix-example-credit),
.t216.design-system .matrix-general-example>p { font: 400 1.25rem/1.75 var(--font-serif); }
.t216.design-system main :is(.eyebrow, .notebook-label, .note-meta, .matrix-example-credit, .vocab-tier-note, .source-boundary, .scope-note, .select-help, .page-refs, .word-source) {
  font-size: .875rem; line-height: 1.6;
}
.t216.design-system .matrix-example-credit { font-family: var(--font-ui); }

/* One selected-state language across navigation; links within lessons stay blue. */
.t216.design-system .course-rail .course-destinations>a {
  font: 400 1rem/1.5 var(--font-ui); min-height: 2.75rem; padding: .7rem .65rem;
}
.t216.design-system .course-rail .course-destinations>a[aria-current=page] { font-weight: 700; }
.t216.design-system .work-stages { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.t216.design-system .work-stages:has(a:nth-child(4)) { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.t216.design-system .work-stages a { color: var(--ink); padding: .75rem .65rem; }
.t216.design-system .work-stages a strong { font: 400 1rem/1.4 var(--font-ui); }
.t216.design-system .work-stages a[aria-current=step] {
  background: var(--brand-red-light); color: var(--brand-red); box-shadow: inset 0 -3px var(--brand-red);
}
.t216.design-system .work-stages a[aria-current=step] strong { font-weight: 700; }
.t216.design-system .tool-nav a { font: 400 1rem/1.5 var(--font-ui); color: var(--ink); min-height: 2.75rem; }
.t216.design-system .tool-nav a[aria-current=page] { color: var(--brand-red); border-bottom-color: var(--brand-red); font-weight: 700; }
.t216.design-system :is(.work-stages a, .tool-nav a):is(:hover, :focus-visible) { color: var(--brand-red); background: var(--brand-red-light); }
.t216.design-system .tool-nav { gap: .25rem 1rem; }
.t216.design-system .topbar { height: auto; min-height: 4rem; flex-wrap: wrap; gap: .5rem 1rem; padding-block: .6rem; }

@media (max-width: 900px) {
  .t216.design-system .course-rail { display: none; }
  .t216.design-system .course-rail.menu-open { display: block; }
  .t216.design-system .course-rail>.rail-top { display: flex; justify-content: flex-end; margin-bottom: .7rem; }
  .t216.design-system .rail-close { min-width: 2.75rem; min-height: 2.75rem; padding: .5rem .65rem; font: 400 1rem/1.4 var(--font-ui); letter-spacing: normal; }
  .t216.design-system .gloss-row { display: block; }
  .t216.design-system .margin-gloss { margin-top: 1rem; max-width: none; }
}
@media (max-width: 700px) {
  .t216.design-system main .design-page-title { font-size: 2rem; }
  .t216.design-system main .design-question-title { font-size: 2rem; line-height: 1.25; }
  .t216.design-system .study-banner { height: 4.5rem; margin-bottom: 1.1rem; }
  .t216.design-system .work-stages,
  .t216.design-system .work-stages:has(a:nth-child(4)) { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .t216.design-system .work-stages a { min-height: 3rem; border-bottom: 1px solid var(--line); }
  .t216.design-system .work-stages a:nth-child(even) { border-right: 0; }
  .t216.design-system .work-stages a:nth-last-child(-n+2) { border-bottom: 0; }
  .t216.design-system .tools-bar { gap: .75rem; flex-wrap: wrap; }
  .t216.design-system .tool-nav { gap: .2rem .85rem; }
  .t216.design-system .week-selection select { font-size: 1rem; padding-inline: .6rem; }
  .t216.design-system .matrix-family-heading { align-items: flex-start; flex-wrap: wrap; }
  .t216.design-system .landing-path .path-description { font-size: 1.3rem; }
}
/* Word history is readable supporting instruction, below the word's definition. */
.t216.design-system .word-origin { margin: 1rem 0; padding-top: .8rem; border-top: 1px solid var(--line); }
.t216.design-system main .word-origin p { font: 400 1rem/1.65 var(--font-ui); margin: .4rem 0 .75rem; color: var(--ink); }
.t216.design-system .word-origin .origin-label { display: block; font: 700 .875rem/1.5 var(--font-ui); color: var(--muted); margin-bottom: .2rem; }
.t216.design-system .word-origin .origin-root { font-weight: 700; display: block; margin-bottom: .3rem; }
.t216.design-system .word-origin > summary { font: 400 1rem/1.5 var(--font-ui); color: var(--link, #175b8e); cursor: pointer; }
.t216.design-system .word-origin[open] > summary { margin-bottom: .7rem; }
.t216.design-system main .origin-references,
.t216.design-system :is(.origin-source-toggle, .flip-sources) { font: 400 .875rem/1.6 var(--font-ui); color: var(--muted); }
.t216.design-system :is(.origin-source-toggle, .flip-sources) > summary { cursor: pointer; padding-block: .25rem; }
.t216.design-system :is(.word-origin, .origin-source-toggle, .flip-sources) > summary:focus-visible { outline: 2px solid var(--link, #175b8e); outline-offset: 4px; }
.t216.design-system .margin-definition .word-origin { margin: .5rem 0 0; padding-top: 0; border: 0; }
.t216.design-system .model-legend .origin-word-list { display: block; list-style: none; padding: 0; margin: 1rem 0; }
.t216.design-system .model-legend .origin-word-list > li { display: block; padding: .6rem 0; margin: 0; border-top: 1px solid var(--line); font-size: 1rem; }
.t216.design-system .model-legend .origin-word-list .word-origin { margin: .3rem 0 0; padding: 0; border: 0; }
.t216.design-system .origin-list-term { font: 700 1rem/1.5 var(--font-ui); }
.t216.design-system .flashcard-item { min-width: 0; display: flex; flex-direction: column; }
.t216.design-system .flashcard-item .word-flip { flex: 1; }
.t216.design-system .flip-sources { margin-top: .4rem; }
.t216.design-system .flip-origin { border-top: 1px solid var(--line); padding-top: .6rem; }

@media print {
  .t216.design-system { font-size: 11pt; }
  .t216.design-system main p { font-size: 11pt; }
  .t216.design-system main :is(.design-page-title, .design-question-title) { font-size: 24pt; color: var(--ink); }
  .t216.design-system main .design-section-title { font-size: 17pt; color: var(--ink); }
  .t216.design-system .model-paragraph { font-size: 12pt; }
  .t216.design-system .word-origin { break-inside: avoid; }
  .t216.design-system details.word-origin > :not(summary) { display: block !important; }
  .t216.design-system :is(.origin-source-toggle, .flip-sources) { display: none; }
}

/* Resource categories sit together at the bottom of the course menu. */
.t216.design-system .resource-destinations { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.t216.design-system .resource-destinations h2 { font: 700 1.25rem/1.4 var(--font-serif); color: var(--brand-red); margin: 0 .65rem .45rem; }
.t216.design-system .resource-destinations h2 a { color: inherit; text-decoration: none; }
.t216.design-system .resource-destinations h2 a:hover { text-decoration: underline; text-underline-offset: .18em; }
.t216.design-system .resource-entry { margin-top: 2rem; }
.t216.design-system .resource-art { margin: 1rem 0; }
.t216.design-system .resource-art img { display: block; width: 100%; height: auto; }
.t216.design-system .resource-art figcaption { font: 400 .875rem/1.5 var(--font-ui); color: var(--muted); margin-top: .5rem; }
.t216.design-system .resource-coming-soon { color: var(--muted); margin-top: 2rem; }