/* Tokens */
:root {
  color-scheme: dark;
  --bg: #1c1b19;
  --surface: #242320;
  --surface-hover: #2c2a26;
  --text: #e9e5dd;
  --muted: #b4ada2;
  --line: #46423b;
  --accent: #d8b57d;
  --control-line: #82796b;
  --font: "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
  --mono: "Cascadia Mono", Consolas, monospace;
  --shell: 100rem;
  --measure: 72ch;
  --gutter: clamp(1rem, 3vw, 3rem);
  --radius: .625rem;
  --space: clamp(1.25rem, 2vw, 2rem);
}

/* Base and typography */
* { box-sizing: border-box; }
html { background: var(--bg); font-size: 100%; scroll-padding-block: 1rem; }
body.s106 { margin: 0; background: var(--bg); color: var(--text); font: 1rem/1.65 var(--font); overflow-wrap: anywhere; }
::selection { background: var(--accent); color: var(--bg); }
a { color: var(--accent); text-underline-offset: .22em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
button, input, textarea, select { font: inherit; }
button, input, textarea { accent-color: var(--accent); }
button, summary, label[for] { cursor: pointer; }
img, svg { max-inline-size: 100%; block-size: auto; }
h1, h2, h3, h4 { font-weight: 600; line-height: 1.25; }
h1 { margin: 0 0 1rem; font-size: clamp(2rem, 3.5vw, 3.25rem); letter-spacing: -.035em; max-inline-size: 32ch; text-wrap: balance; }
h2 { margin: 0 0 1rem; font-size: clamp(1.25rem, 2vw, 1.5rem); letter-spacing: -.02em; }
h3 { margin: 1.75rem 0 .75rem; font-size: 1.125rem; }
p { margin: 0 0 1rem; }
strong { font-weight: 600; }
small, .muted { color: var(--muted); }
small { font-size: .875rem; }
[hidden] { display: none !important; }
[id] { scroll-margin-block-start: 1rem; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.sr-only { position: absolute; inline-size: 1px; block-size: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip { position: absolute; z-index: 20; inset: .75rem auto auto 1rem; padding: .75rem 1rem; background: var(--text); color: var(--bg); transform: translateY(-200%); }
.skip:focus { transform: none; }

/* Site navigation */
.top { max-inline-size: var(--shell); margin-inline: auto; padding: .75rem var(--gutter) 0; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; min-block-size: 44px; color: var(--text); font-size: 1.125rem; font-weight: 600; letter-spacing: -.03em; text-decoration: none; }
.brand::before { content: "106"; margin-inline-end: .75rem; color: var(--accent); font: .875rem var(--mono); border-inline-end: 1px solid var(--line); padding-inline-end: .75rem; }
.top-nav { display: flex; flex-wrap: wrap; gap: 0 .25rem; padding-block: .25rem 0; }
.top-nav a { display: inline-flex; align-items: center; min-block-size: 48px; padding: .5rem .625rem; color: var(--muted); font-size: .875rem; text-decoration: none; border-bottom: 2px solid transparent; }
.top-nav a:is(:hover, .is-active, [aria-current]) { color: var(--accent); }
.top-nav a:is(.is-active, [aria-current]) { border-bottom-color: var(--accent); }
.top-nav a:hover { background: var(--surface); }
.top-nav a:focus-visible { outline-offset: -3px; }

/* Page shell and context */
.page, .foot { inline-size: 100%; max-inline-size: var(--shell); margin-inline: auto; padding-inline: var(--gutter); }
.page { padding-block: 1.5rem 4rem; }
.page > *, .day-workspace > *, .course-layout > *, .unit-stage > *, .home-grid > *, .home-side > * { min-inline-size: 0; }
.hero { margin-block: 0 2rem; }
.eyebrow { margin-bottom: .625rem; color: var(--accent); font: .875rem/1.5 var(--mono); }
.lede { max-inline-size: var(--measure); color: var(--muted); font-size: 1.125rem; }
.hero > :last-child { margin-bottom: 0; }
.home-hero h1 { font-size: clamp(2rem, 3vw, 2.75rem); }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem .625rem; margin: -.5rem 0 1rem; color: var(--muted); font-size: .875rem; }
.breadcrumbs a { display: inline-flex; align-items: center; min-block-size: 44px; }
.day-nav, .page-jumps, .section-links { display: flex; flex-wrap: wrap; gap: .25rem .5rem; }
.day-nav { padding-block: .5rem; margin-block: 0 1.5rem; border-block: 1px solid var(--line); }
.day-nav a, .page-jumps a, .section-links a { display: inline-flex; align-items: center; justify-content: center; min-block-size: 44px; padding: .5rem .75rem; border-radius: .25rem; font-size: .875rem; }
.day-nav a { color: var(--muted); text-decoration: none; }
.day-nav a[aria-current] { background: var(--surface-hover); color: var(--accent); box-shadow: inset 0 -2px var(--accent); }
.day-nav a:hover, .page-jumps a:hover, .section-links a:hover { background: var(--surface-hover); }
.page-jumps { margin-block: 1rem 1.5rem; }

/* Shared panels and actions */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: var(--space); }
.panel-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .5rem 1rem; margin-bottom: 1rem; }
.panel-head h2 { margin: 0; }
.panel-head a { display: inline-flex; align-items: center; min-block-size: 44px; font-size: .875rem; }
.panel-head .eyebrow { margin: 0; color: var(--muted); }
.button, a.pill, button.pill, label.pill { display: inline-flex; justify-content: center; align-items: center; min-block-size: 44px; padding: .625rem 1rem; border: 1px solid var(--control-line); border-radius: .375rem; background: var(--surface); color: var(--text); font: .875rem/1.5 var(--font); text-decoration: none; }
.button:hover, a.pill:hover, button.pill:hover, label.pill:hover { background: var(--surface-hover); border-color: var(--accent); }
.button.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); font-weight: 600; }
.button.primary:hover { background: #e4c798; }
.pill { display: inline-block; padding: .125rem .5rem; border: 1px solid var(--line); border-radius: .25rem; color: var(--muted); font-size: .875rem; line-height: 1.5; }
.empty-state, .saved-hint { color: var(--muted); font-size: .875rem; }
.saved-hint { margin: .625rem 0 0; }
.status-line { margin: .75rem 0; font-size: .875rem; color: var(--muted); }

/* Home composition */
.home-grid, .home-side { display: grid; gap: var(--space); align-items: start; }
.study-panel .study-title { margin: .25rem 0 .75rem; max-inline-size: 36ch; font-size: 1.5rem; }
.study-panel .lede { font-size: 1rem; margin-bottom: 1.25rem; }
.study-panel .section-links { border-top: 1px solid var(--line); margin-top: .75rem; padding-top: .75rem; }
.study-panel .section-links a { padding-inline: .5rem; }
.book-title { margin: 0 0 .5rem; font-size: 1.25rem; }
.book-meta { color: var(--muted); font-size: .875rem; }
.library-panel > .button { margin-top: 1rem; }
.week-context { margin-top: 1.5rem; }
.week-context > .doc { margin-block: 1.25rem; }
.home-side .day-card { border: 0; background: transparent; }
.home-side .day-card > a { padding: .5rem 0 1rem; }
.home-side .course-entry { margin: 0; padding: 0; list-style: none; }
.home-side .course-progress { border: 0; padding: 0; }
.home-side .continue-link { display: flex; margin-top: 1rem; }

/* Compact study rows and course cards */
.week { margin-block: 1.5rem; }
.days { margin: 0; padding: 0; list-style: none; }
.day-card { min-inline-size: 0; background: var(--surface); border-bottom: 1px solid var(--line); }
.day-card > a { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: .375rem .875rem; min-block-size: 64px; padding: 1rem .5rem; color: var(--text); text-decoration: none; }
.day-card > a:hover { background: var(--surface-hover); }
.day-card > a:focus-visible { outline-offset: -2px; }
.day-num { grid-column: 1; grid-row: 1 / 4; color: var(--muted); font: .875rem/1.65 var(--mono); padding-top: .125rem; }
.day-theme { grid-column: 2; font-weight: 600; line-height: 1.45; }
.day-state, .course-state { margin-inline-start: .375rem; font-weight: 400; }
.day-exit { grid-column: 2; color: var(--muted); font-size: .875rem; line-height: 1.55; }
.exit-label { color: var(--text); font-weight: 500; }
.progress { display: block; grid-column: 2; block-size: 4px; margin-top: .5rem; background: var(--line); border-radius: 2px; overflow: hidden; }
.progress-bar, .course-bar, .module-bar { display: block; block-size: 100%; max-inline-size: 100%; background: var(--accent); }
.day-card.is-active, .day-card.is-started { box-shadow: inset 2px 0 var(--accent); }
.day-card.is-active .day-num, .day-card.is-started .day-num { color: var(--accent); }
.day-card.is-done .day-num::after { content: " ✓"; }
.day-card.is-done .progress-bar, .module-card.is-done .module-bar { background: var(--muted); }
.day-card.is-done .day-theme { color: var(--muted); }
.day-card[data-course] > a { grid-template-columns: minmax(0, 1fr); }
.day-card[data-course] :is(.day-num, .day-theme, .day-exit, .progress) { grid-column: 1; grid-row: auto; }
.day-card[data-course] .day-num { color: var(--accent); }
.day-card[data-course] .day-theme { font-size: 1.25rem; }
.day-idle { color: var(--muted); font-size: .875rem; font-weight: 400; }
.day-card:is(.is-active, .is-started, .is-done) .day-idle { display: none; }

/* Reading documents and local overflow */
.doc { inline-size: 100%; max-inline-size: var(--measure); min-inline-size: 0; line-height: 1.8; }
.doc h2 { margin-top: 2.5rem; padding-top: .75rem; }
.doc h3 { margin-top: 2rem; line-height: 1.5; }
.doc > :first-child { margin-top: 0; }
.doc ul, .doc ol { margin: 0 0 1.25rem; padding-inline-start: 1.5rem; }
.doc li { margin-block: .5rem; padding-inline-start: .25rem; }
.doc li::marker { color: var(--accent); }
.doc a { display: inline-block; min-block-size: 44px; align-content: center; }
.doc blockquote { margin: 1.75rem 0; padding: .25rem 0 .25rem 1.25rem; border-inline-start: 2px solid var(--accent); color: var(--muted); }
.doc blockquote > :last-child { margin-bottom: 0; }
code, pre { font-family: var(--mono); font-size: .875em; }
:not(pre) > code { padding: .125em .25em; border-radius: .25rem; background: var(--surface-hover); }
pre { max-inline-size: 100%; overflow-x: auto; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); line-height: 1.65; tab-size: 2; }
pre code { white-space: pre; overflow-wrap: normal; font-size: 1em; }
hr { margin-block: 2rem; border: 0; border-top: 1px solid var(--line); }
.table-wrap { max-inline-size: 100%; overflow-x: auto; margin-block: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); }
.table-wrap, pre { scrollbar-width: thin; scrollbar-color: var(--control-line) var(--surface); overscroll-behavior-inline: contain; }
table { inline-size: 100%; min-inline-size: 42rem; border-collapse: collapse; font-size: .875rem; line-height: 1.65; }
th, td { min-inline-size: 7rem; padding: .75rem 1rem; text-align: start; vertical-align: top; }
th { background: var(--surface-hover); font-weight: 600; }
td { border-top: 1px solid var(--line); }
tbody tr:nth-child(even) { background: var(--surface); }
.reference-page .doc { max-inline-size: none; }
.reference-page .doc > :not(.table-wrap) { max-inline-size: var(--measure); }

/* Day workspace and generated contents lists */
.day-workspace, .course-layout { display: grid; gap: 2rem; align-items: start; }
.toc { padding: 1.25rem; margin-bottom: 2rem; border: 1px solid var(--line); border-radius: var(--radius); }
.toc h2 { margin-bottom: .625rem; font-size: 1.125rem; }
.toc ol { list-style: none; padding: 0; margin: 0; }
.toc li + li { border-top: 1px solid var(--line); }
.toc a { display: flex; gap: .75rem; align-items: baseline; min-block-size: 44px; padding-block: .625rem; color: var(--text); font-size: .875rem; line-height: 1.5; text-decoration: none; }
.toc a:hover { color: var(--accent); text-decoration: underline; }
.toc .toc-num { color: var(--accent); flex: 0 0 1.5rem; font-family: var(--mono); }
.day-workspace .audio { margin: 0; padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.day-workspace > .doc { margin-inline: auto; }
.day-workspace > .toc { margin-bottom: 0; }
.day-finish { display: grid; gap: 2rem; margin-top: 2.5rem; border-top: 1px solid var(--line); padding-top: 1.5rem; }
.day-finish :is(.checklist, .notes) { border: 0; padding: 0; margin: 0; }

/* Audio players and honest playback states */
.audio, .checklist, .sources, .notes { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.audio { margin-bottom: 2rem; }
.tracks { list-style: none; padding: 0; margin: 0; }
.track { min-inline-size: 0; margin-top: .75rem; padding: .875rem; border: 1px solid var(--line); border-radius: .375rem; background: var(--surface); }
.track-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem .75rem; margin-bottom: .625rem; }
.track-title { flex: 1 1 12rem; font-weight: 500; line-height: 1.5; }
.track-meta { color: var(--muted); font: .875rem/1.5 var(--mono); white-space: nowrap; }
.track audio { display: block; inline-size: 100%; min-inline-size: 0; block-size: 54px; }
.track.has-progress { border-inline-start-color: var(--accent); box-shadow: inset 2px 0 var(--accent); }
.track.has-progress .track-title::before { content: "Resume · "; color: var(--accent); }
.track.is-played .track-title::before { content: "Played · "; color: var(--muted); }
.track.is-played .track-title { color: var(--muted); }
.compact-tracks .track { padding: 0; margin: 0; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; }
.compact-tracks summary { min-block-size: 64px; padding: .75rem .5rem; }
.compact-tracks .track-head { display: inline; margin: 0; }
.compact-tracks .track-title { font-size: .875rem; }
.compact-tracks .track-meta { margin-inline-start: .5rem; }
.compact-tracks .track-status { display: block; margin-inline-start: 1.125rem; color: var(--muted); font-size: .875rem; }
.compact-tracks .track audio { margin-block: .25rem .75rem; }
.compact-tracks .track .track-title::before { content: none; }
.resume-state, .played-state { display: none; }
.has-progress .resume-state, .is-played:not(.has-progress) .played-state { display: inline; }
.track:is(.has-progress, .is-played) .idle-state { display: none; }
.has-progress .resume-state { color: var(--accent); }

/* Checklists and notes */
.check { display: flex; align-items: flex-start; gap: .875rem; min-block-size: 56px; margin-block: .5rem; padding: 1rem; border: 1px solid var(--line); border-radius: .375rem; background: var(--surface); cursor: pointer; }
.check:hover { background: var(--surface-hover); }
.check input { flex: 0 0 auto; inline-size: 22px; block-size: 22px; margin: .125rem 0 0; cursor: pointer; }
.check span { min-inline-size: 0; }
.check.is-done { background: transparent; }
.check.is-done span { color: var(--muted); }
.check:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 3px; }
.notes-box { display: block; inline-size: 100%; min-block-size: 18rem; resize: vertical; padding: 1rem; border: 1px solid var(--control-line); border-radius: .375rem; background: var(--surface); color: var(--text); line-height: 1.8; }
.notes-box::placeholder { color: var(--muted); opacity: 1; }
.notes h2 label { display: inline-flex; align-items: center; min-block-size: 44px; }
.unit-done { align-items: center; }
.unit-done input { margin-top: 0; }
.unit-done small { display: block; }

/* Download rows */
.files { list-style: none; padding: 0; margin: 0; }
.files li { border-bottom: 1px solid var(--line); }
.files a, .handout { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .25rem .75rem; align-items: baseline; min-block-size: 56px; padding: .875rem .5rem; text-decoration: none; }
.files a:hover, .handout:hover { background: var(--surface-hover); }
.files a:hover .file-name, .handout:hover .file-name { text-decoration: underline; }
.file-name { grid-column: 1 / -1; font-size: .875rem; overflow-wrap: anywhere; }
.sources .file-name { font-family: var(--mono); }
.file-kind, .file-size { color: var(--muted); font: .875rem/1.5 var(--mono); }
.file-size { text-align: end; }
.files a.is-manifest { color: var(--text); border-inline-start: 2px solid var(--accent); padding-inline-start: .875rem; }
.source-disclosure { margin-top: 2rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.source-disclosure .sources { margin: 0; border: 0; padding-block: .5rem 1rem; }
.source-disclosure .files { max-inline-size: 100%; }

/* Disclosures and progress transfer */
summary { min-block-size: 48px; padding: .75rem .5rem; color: var(--accent); line-height: 1.5; }
summary:hover { background: var(--surface-hover); }
summary::marker { color: var(--accent); }
details[open] > summary { margin-bottom: .75rem; }
.reveal { margin-top: 1rem; border: 1px solid var(--line); border-radius: .375rem; }
.reveal[open] { border-color: var(--control-line); }
.reveal > :not(summary) { margin-inline: 1rem; }
.reveal > a { display: flex; align-items: center; min-block-size: 44px; }
.transfer { margin-top: 2rem; padding-top: .5rem; border-top: 1px solid var(--line); }
.transfer > p { max-inline-size: var(--measure); color: var(--muted); font-size: .875rem; }
.transfer-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }
.import-control { display: grid; gap: .5rem; max-inline-size: 100%; }
.import-control label { display: flex; align-items: center; min-block-size: 44px; font-size: .875rem; color: var(--muted); }
input[type="file"] { inline-size: 100%; max-inline-size: 25rem; min-block-size: 44px; font-size: .875rem; }
input[type="file"]::file-selector-button { min-block-size: 44px; padding: .5rem .875rem; margin-inline-end: .75rem; border: 1px solid var(--control-line); border-radius: .375rem; color: var(--text); background: var(--surface); cursor: pointer; }
#progress-msg { display: block; min-block-size: 1.5rem; margin-top: 1rem; font-size: .875rem; }

/* Course overview and sequence */
.course-hero .lede { margin-bottom: 1rem; }
.course-resume { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.5rem; padding-block: 1rem; border-block: 1px solid var(--line); margin-bottom: 2rem; }
.course-progress { color: var(--muted); font-size: .875rem; }
.continue-link { min-block-size: 44px; max-inline-size: 100%; }
.continue-link:not([href]) { cursor: default; background: var(--surface); border-color: var(--line); color: var(--muted); }
.course-outline .toc { margin-bottom: 1rem; }
.course-info { padding-block: .5rem; border-bottom: 1px solid var(--line); }
.course-info p { color: var(--muted); font-size: .875rem; }
.course-info a { display: inline-block; min-block-size: 44px; align-content: center; }
.modules, .modules-list { padding: 0; margin: 0; list-style: none; }
.module-card { padding: 1.25rem; margin-bottom: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.module-card > header { display: flex; gap: .75rem; align-items: baseline; }
.module-card > header > span { color: var(--accent); font: .875rem var(--mono); }
.module-card h2 { margin: 0; font-size: 1.25rem; }
.module-status { margin: .5rem 0; font-size: .875rem; }
.module-card > .progress { max-inline-size: 12rem; margin-bottom: 1rem; }
.module-card ol { list-style: none; margin: 0; padding: 0; }
.act + .act { border-top: 1px solid var(--line); }
.act a { display: flex; flex-wrap: wrap; align-items: baseline; gap: .5rem 1rem; min-block-size: 48px; padding: .75rem .5rem; text-decoration: none; color: var(--text); line-height: 1.5; }
.act a > :first-child { flex: 1 1 16rem; }
.act a:hover { background: var(--surface-hover); color: var(--accent); }
.act.is-checkpoint a { border-inline-start: 2px solid var(--accent); padding-inline-start: .875rem; }
.act.is-exam a { border-inline-start: 2px double var(--accent); background: var(--surface-hover); padding-inline-start: .875rem; font-weight: 600; }
.act.is-done a { color: var(--muted); }
.act:is(.is-active, .is-started) a, .act a[aria-current="step"] { color: var(--accent); background: var(--surface-hover); }
.module-card:is(.is-active, .is-started) { border-inline-start-color: var(--accent); }
.module-card.is-done > header { color: var(--muted); }
.act-state { font-weight: 400; }
.attribution { max-inline-size: var(--measure); margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); font-size: .875rem; }

/* Lecture workspace, checkpoints, and exams */
.unit-stage { display: grid; gap: 1.5rem; align-items: start; }
.video { position: relative; inline-size: 100%; min-inline-size: 0; aspect-ratio: 16 / 9; border: 1px solid var(--line); border-radius: var(--radius); background: #141311; overflow: hidden; }
.video iframe, .video > div { position: absolute; inset: 0; display: block; inline-size: 100%; block-size: 100%; border: 0; }
.watch-column > .saved-hint a { display: inline-block; min-block-size: 44px; align-content: center; }
.unit-materials { padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.unit-materials .sources { margin: 0; padding: 0; border: 0; }
.unit-materials h2 { font-size: 1.125rem; }
.unit-materials .file-name { font-family: var(--font); }
.pset { margin-block: 1.5rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.pset > p { font-size: .875rem; }
.pset h2 .pill { margin-inline-start: .25rem; font-weight: 400; }
.unit-materials .pset { margin: 1.5rem 0 0; padding: 1.25rem 0 0; border: 0; border-top: 1px solid var(--line); border-radius: 0; }
.transcript { margin-top: 1.5rem; border-block: 1px solid var(--line); }
.transcript > .doc { margin-inline: auto; padding: 1rem; }
.unit-completion { max-inline-size: 48rem; }
.unit-nav { display: grid; gap: 1rem; margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.unit-nav a { display: flex; flex-direction: column; justify-content: center; min-block-size: 80px; padding: 1rem; border: 1px solid var(--line); border-radius: .375rem; text-decoration: none; }
.unit-nav a:hover { background: var(--surface-hover); border-color: var(--control-line); }
.unit-nav a > span { font-size: .875rem; color: var(--muted); }
.unit-nav a > strong { font-weight: 500; }
.milestone { display: grid; gap: 1rem; margin-block: 1.5rem; padding-block: 1.25rem; border-block: 1px solid var(--line); }
.milestone > a { display: flex; align-items: center; min-block-size: 44px; }

/* Footer */
.foot { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: center; justify-content: space-between; padding-block: 1.25rem 2rem; border-top: 1px solid var(--line); font-size: .875rem; color: var(--muted); }
.to-top { display: inline-flex; align-items: center; min-block-size: 44px; padding-inline: .5rem; }

/* Tablet layouts */
@media (min-width: 48rem) {
  .top { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding-block: .75rem; }
  .top-nav { padding: 0; }
  .top-nav a { padding-inline: 1rem; }
  .page { padding-top: 2rem; }
  .unit-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .unit-nav a[rel="next"] { text-align: end; }
  .files a, .handout { grid-template-columns: minmax(0, 1fr) 3rem 4.5rem; }
  .file-name, .handout .file-name { grid-column: auto; }
  .day-finish { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .home-side { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .course-layout { grid-template-columns: minmax(14rem, 1fr) minmax(0, 2.5fr); }
}

/* Desktop workspaces */
@media (min-width: 68rem) {
  .home-grid { grid-template-columns: minmax(0, 1.8fr) minmax(20rem, 1fr); }
  .home-side { grid-template-columns: minmax(0, 1fr); }
  .day-workspace { grid-template-columns: minmax(0, 1.65fr) minmax(20rem, 1fr); gap: clamp(2rem, 4vw, 4rem); }
  .day-workspace .audio { grid-column: 2; grid-row: 1 / 3; }
  .day-workspace > .toc { grid-column: 1; grid-row: 1; }
  .day-workspace > .doc { grid-column: 1; grid-row: 2; }
  .unit-stage { grid-template-columns: minmax(0, 2fr) minmax(20rem, 1fr); }
  .course-layout { grid-template-columns: minmax(16rem, 1fr) minmax(0, 3fr); gap: 3rem; }
  .source-disclosure .files { columns: 2; column-gap: 2rem; }
  .source-disclosure .files li { break-inside: avoid; }
}

/* Large home rows use width for the full exit test */
@media (min-width: 88rem) {
  .study-panel .day-card > a { grid-template-columns: 2rem minmax(0, 1fr) minmax(0, 1.1fr); gap: .5rem 1rem; padding-block: 1rem; }
  .study-panel .day-exit { grid-column: 3; grid-row: 1 / 3; }
  .study-panel .progress { grid-column: 2; grid-row: 2; align-self: end; max-inline-size: 9rem; }
}

/* Reduced motion and forced colors */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media (forced-colors: active) {
  .progress { border: 1px solid CanvasText; }
  .progress-bar { background: Highlight; forced-color-adjust: none; }
  .day-nav a[aria-current], .check.is-done { border: 1px solid Highlight; }
}