/* The course reading room. Shared navigation, chapter openings, and lesson pages. */
.navbar { border-top: 0; padding: .65rem 2rem; box-shadow: 0 1px 0 #fff9; }
.navbar-container { max-width: 1440px; }
.navbar-brand { font-size: 1.6rem; }
.navbar-brand span[lang=ar] { color: var(--brass); }
.navbar .nav-link { color: var(--muted); font-size: .72rem; letter-spacing: .04em; }
#quarto-search { color: var(--ink); }
.course-reading { background: #f7f4ec; }
.course-reading #quarto-content { padding-top: 35px; }
.course-reading #quarto-sidebar { border: 0; background: transparent; padding: 20px 24px 20px 8px; }
.course-reading .quarto-page-breadcrumbs { display: none; }
.course-rail-heading { padding: 0 16px 26px; border-bottom: 1px solid var(--rule); margin-bottom: 20px; }
.rail-emblem { display: block; color: var(--brass); font-size: 2.7rem; line-height: 1.1; margin-bottom: 22px; }
.section-label { font-size: .6rem; letter-spacing: .17em; font-weight: 600; color: var(--green); display: block; }
.course-rail-heading p { font-family: var(--serif); color: var(--ink); font-size: 1.4rem; line-height: 1.2; margin: 10px 0 3px; }
.rail-subtitle { font-size: .68rem; color: var(--muted); }
.course-rail-list { list-style: none; padding: 0; margin: 0; }
.course-rail-list li { margin: 5px 0; }
.course-rail-list a { display: grid; grid-template-columns: 25px 1fr; gap: 12px; padding: 16px 13px; text-decoration: none; font-size: .78rem; line-height: 1.55; color: var(--muted); border-left: 2px solid transparent; }
.course-rail-list a:hover { background: #eee8da; }
.course-rail-list .rail-current a { background: #eae5d8; color: var(--ink); border-left-color: var(--brass); }
.rail-number { font-family: var(--serif); font-size: 1rem; color: var(--brass); }
.rail-back { display: inline-block; margin: 30px 15px; font-size: .65rem; text-decoration: none; color: var(--muted); }
.course-reading main.content { min-width: 0; padding-top: 15px; }
.course-reading #title-block-header { position: relative; padding: 16px 0 26px; margin-bottom: 0; border-top: 1px solid var(--brass); }
.folio-label { font-size: .61rem; font-weight: 600; letter-spacing: .17em; color: var(--green); margin: 0 0 26px; }
.course-reading .quarto-title h1.title { border: 0; padding: 0; font-size: clamp(2.4rem, 3.5vw, 3.8rem); line-height: 1.07; letter-spacing: -.035em; margin: 0 0 20px; max-width: 650px; }
.course-reading .quarto-title .subtitle { font-family: var(--serif); font-size: 1.2rem; line-height: 1.6; max-width: 610px; color: var(--muted); margin-bottom: 0; }
.chapter-overview #title-block-header { padding-top: 27px; padding-bottom: 36px; }
.chapter-overview #title-block-header:after { content: attr(data-chapter); position: absolute; right: 0; top: 10px; color: #9a7a3e18; font-family: var(--serif); font-size: 8rem; line-height: 1; pointer-events: none; }
.chapter-overview .folio-label { margin-bottom: 34px; }
.course-reading .chapter-material-nav { gap: 0; padding: 0; margin: 0 0 38px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.course-reading .chapter-material-nav a { padding: 14px 22px; font-size: .68rem; letter-spacing: .03em; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.course-reading .chapter-material-nav a:first-child { padding-left: 0; padding-right: 25px; }
.course-reading .chapter-material-nav a:hover { color: var(--green); }
.course-reading .chapter-material-nav a[aria-current] { border-bottom-color: var(--brass); color: var(--ink); }
.material-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 17px 0 50px; }
.material-card { border: 1px solid var(--rule); background: #fcfaf4; padding: 23px 20px; display: flex; flex-direction: column; color: var(--ink); text-decoration: none; min-width: 0; transition: border-color .2s, transform .2s; }
.material-card:hover { border-color: var(--brass); transform: translateY(-3px); color: var(--ink); }
.material-index { display: flex; justify-content: space-between; color: var(--brass); font-family: var(--serif); font-size: .9rem; margin-bottom: 27px; }
.material-index span { font-size: 1.5rem; line-height: 1; }
main.content .material-card h2 { font-family: var(--serif); font-weight: 400; font-size: 1.3rem; border: 0; padding: 0; margin: 0 0 12px; line-height: 1.2; }
.material-card p { font-size: .74rem; color: var(--muted); line-height: 1.7; margin-bottom: 28px; }
.material-action { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--rule); display: flex; justify-content: space-between; font-size: .61rem; color: var(--green); }
.material-cards:has(> :only-child) { grid-template-columns: minmax(0, 1fr); }
.material-cards:has(> :only-child) .material-card { max-width: 430px; }
.course-reading main.content > section > h2 { font-size: 1.8rem; border-bottom: 0; margin-top: 2.8rem; margin-bottom: 1.2rem; padding-bottom: 0; }
.chapter-document main.content { font-size: .96rem; line-height: 1.9; }
.chapter-document main.content > p:first-of-type { font-family: var(--serif); font-size: 1.22rem; line-height: 1.7; color: var(--ink); }
.course-reading main.content h3 { font-family: var(--serif); font-size: 1.4rem; margin-top: 1.8rem; }
.course-reading .learning-objectives { background: #ece8dc; border: 1px solid var(--rule); border-left: 3px solid var(--brass); padding: 25px 30px; margin: 35px 0 45px; }
.course-reading main.content .learning-objectives > h2 { font-size: 1.5rem; margin: 0 0 15px; }
.learning-objectives ul { padding-left: 1.25rem; margin-bottom: 0; }
.learning-objectives li { padding: 4px 0; font-size: .86rem; }
.course-reading #quarto-margin-sidebar { padding-top: 22px; }
.course-reading #TOC { border-top: 1px solid var(--rule); padding-top: 17px; font-size: .66rem; line-height: 1.6; }
.course-reading #toc-title { color: var(--brass); font-size: .58rem; letter-spacing: .15em; margin-bottom: 20px; }
.course-reading #TOC a { color: var(--muted); padding: 5px 0 5px 12px; }
.course-reading #TOC > ul { border-left: 1px solid var(--rule); }
.course-reading div.sourceCode { border-top: 2px solid #b2a17e; background: #efede5; margin: 24px 0; }
.course-reading div.sourceCode pre { font-size: .78rem; line-height: 1.75; padding: 20px; }
.course-reading .cell-output pre { background: transparent; border-left: 2px solid var(--rule); border-top: 0; border-right: 0; border-bottom: 0; color: var(--muted); }
.course-reading .chapter-pagination { gap: 25px; padding-top: 25px; margin: 65px 0 35px; }
.chapter-pagination a { display: flex; flex-direction: column; flex: 1; text-decoration: none; }
.chapter-pagination a:last-child { text-align: right; }
.chapter-pagination a span { font-size: .55rem; letter-spacing: .13em; color: var(--muted); margin-bottom: 8px; }
.chapter-pagination a strong { font-family: var(--serif); font-size: 1.15rem; font-weight: 400; color: var(--ink); }
.chapter-overview main.content > section { border-top: 1px solid var(--rule); }
.chapter-overview main.content > section h2 { margin-top: 28px; }
.chapter-overview main.content > section li { font-size: .83rem; line-height: 1.8; margin-bottom: 14px; }
.chapter-overview main.content > section h3 { font-family: inherit; font-size: .64rem; font-weight: 600; text-transform: uppercase; letter-spacing: .1em; color: var(--brass); }
@media (min-width: 992px) {
  .course-reading #quarto-content { max-width: none; width: 100%; margin: 0; padding-left: 24px; padding-right: 24px; column-gap: 32px; grid-template-columns: 215px minmax(0, 1fr) 175px; }
  .course-reading #quarto-sidebar { grid-column: 1; width: 215px; }
  .course-reading main.content { grid-column: 2; }
  .course-reading #quarto-margin-sidebar { grid-column: 3; }
  .course-reading .page-columns { grid-template-columns: minmax(0, 1fr); }
  .course-reading main.content > * { grid-column: 1; }
}
@media (min-width: 992px) and (max-width: 1199px) {
  .course-reading #quarto-content { grid-template-columns: 190px minmax(0, 1fr); gap: 26px; }
  .course-reading #quarto-sidebar { width: 190px; }
  .course-reading #quarto-margin-sidebar { display: none; }
}
@media (max-width: 991px) {
  .navbar { padding: .55rem 1rem; }
  .course-reading #quarto-content { padding-top: 15px; }
  .course-reading main.content { padding-top: 12px; }
  .course-reading #quarto-sidebar { background: var(--paper); padding: 20px; }
  .course-rail-heading { padding-bottom: 15px; margin-bottom: 10px; }
  .rail-emblem { display: none; }
  .course-rail-list a { padding: 12px; }
  .rail-back { margin: 15px; }
  .quarto-secondary-nav { border-bottom: 1px solid var(--rule); background: #eee8da; }
  .course-reading .quarto-secondary-nav .quarto-page-breadcrumbs { display: flex; align-items: center; }
  .quarto-secondary-nav .breadcrumb { font-size: .66rem; }
  /* Only English has the extra top-level “Chapters” breadcrumb. */
  html:not([lang=ar]) .quarto-secondary-nav .breadcrumb-item:first-child { display: none; }
  html:not([lang=ar]) .quarto-secondary-nav .breadcrumb-item:nth-child(2):before { display: none; }
}
@media (max-width: 640px) {
  .course-reading #title-block-header { padding: 20px 0 18px; }
  .course-reading .quarto-title h1.title { font-size: 2.55rem; }
  .course-reading .quarto-title .subtitle { font-size: 1.08rem; }
  .folio-label { font-size: .55rem; margin-bottom: 22px; }
  .chapter-overview #title-block-header:after { font-size: 6rem; }
  .course-reading .chapter-material-nav { flex-wrap: nowrap; margin-bottom: 28px; }
  .course-reading .chapter-material-nav a, .course-reading .chapter-material-nav a:first-child { flex: 1; padding: 12px 5px; text-align: center; font-size: .64rem; }
  .material-cards { grid-template-columns: 1fr; gap: 12px; margin-bottom: 35px; }
  .material-card { padding: 20px 24px; }
  .material-index { margin-bottom: 14px; }
  .material-card p { margin-bottom: 16px; }
  .course-reading .learning-objectives { padding: 20px; }
  .chapter-document main.content { font-size: .9rem; }
  .chapter-pagination a strong { font-size: 1rem; }
  .chapter-pagination a span { font-size: .48rem; }
}

/* Quarto's responsive breadcrumb utility uses !important. */
.course-reading #title-block-header .quarto-title-breadcrumbs { display: none !important; }
.course-reading figure:has(img[src*="colab"]) { text-align: left; margin: 0 0 28px; }
.course-reading figure:has(img[src*="colab"]) figcaption { display: none; }
.course-reading figure:has(img[src*="colab"]) p { text-align: left !important; }

/* Use the available desktop canvas; overview pages need no empty TOC column. */
@media (min-width: 992px) {
  .chapter-overview #quarto-content { grid-template-columns: 215px minmax(0, 1fr); }
  .chapter-overview #quarto-margin-sidebar { display: none; }
  .course-reading main.content { width: 100%; max-width: 1100px; justify-self: center; }
  .chapter-document main.content > p,
  .chapter-document main.content section > p { max-width: 85ch; }
  .course-reading .navbar-container { max-width: none; }
}

/* The chapter language switch targets the equivalent material, not the homepage. */
.chapter-language-switch { position: relative; z-index: 1; justify-content: flex-end; margin: -8px 0 22px; }

/* English contents mirror the readable Arabic contents treatment. */
@media(min-width:1200px) {
  html:not([lang=ar]) .chapter-document #quarto-content {
    grid-template-columns: 260px minmax(0, 1fr) 250px;
  }
}
html:not([lang=ar]) .course-reading #quarto-margin-sidebar {
  padding-inline: 0;
  scrollbar-color: transparent transparent;
}
html:not([lang=ar]) .course-reading #quarto-margin-sidebar:hover,
html:not([lang=ar]) .course-reading #quarto-margin-sidebar:focus-within {
  scrollbar-color: #c5b99e transparent;
}
html:not([lang=ar]) .course-reading #TOC {
  width: 100%;
  padding: 20px 8px 12px;
  font-size: .78rem;
  line-height: 1.7;
}
html:not([lang=ar]) .course-reading #TOC ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border: 0;
}
html:not([lang=ar]) .course-reading #TOC li { margin: 3px 0; }
html:not([lang=ar]) .course-reading #TOC a {
  display: block;
  padding: 8px 12px;
  margin: 0;
  text-align: left;
  line-height: 1.7;
  border: 0;
  border-left: 2px solid transparent;
  overflow-wrap: normal;
  word-break: normal;
}
html:not([lang=ar]) .course-reading #TOC a:hover { background: #eee9dc; }
html:not([lang=ar]) .course-reading #TOC a.active {
  background: #eae5d8;
  border-left: 2px solid var(--brass);
  color: var(--green);
}
html:not([lang=ar]) .course-reading #toc-title { margin: 0 12px 16px; }

/* Material navigation should read as primary chapter controls. */
.course-reading .chapter-material-nav { gap: 8px; }
.course-reading .chapter-material-nav a,
.course-reading .chapter-material-nav a:first-child {
  font-size: .95rem;
  padding: 16px 24px;
  line-height: 1.6;
  letter-spacing: 0;
}
@media(max-width:640px) {
  .course-reading .chapter-material-nav { gap: 0; }
  .course-reading .chapter-material-nav a,
  .course-reading .chapter-material-nav a:first-child {
    font-size: .82rem;
    padding: 14px 6px;
  }
}

/* Overviews have no contents sidebar: fill the remaining grid column. */
@media(min-width:992px) {
  .chapter-overview main.content {
    max-width: none;
    justify-self: stretch;
  }
}

/* Keep the English chapter directory as readable as the Arabic directory. */
@media(min-width:1200px) {
  html:not([lang=ar]) .chapter-overview #quarto-content {
    grid-template-columns: 260px minmax(0, 1fr);
  }
  html:not([lang=ar]) .course-reading #quarto-sidebar { width: 260px; }
}
html:not([lang=ar]) .course-reading #quarto-sidebar {
  padding-inline: 8px 16px;
  scrollbar-color: transparent transparent;
}
html:not([lang=ar]) .course-reading #quarto-sidebar:hover,
html:not([lang=ar]) .course-reading #quarto-sidebar:focus-within {
  scrollbar-color: #c5b99e transparent;
}
html:not([lang=ar]) .course-reading .course-rail-heading {
  padding: 0 12px 20px;
  margin-bottom: 16px;
}
html:not([lang=ar]) .course-reading .rail-emblem {
  font-size: 2rem;
  margin-bottom: 14px;
}
html:not([lang=ar]) .course-reading .course-rail-heading p { margin: 8px 0 3px; }
html:not([lang=ar]) .course-reading .course-rail-list li { margin: 6px 0; }
html:not([lang=ar]) .course-reading .course-rail-list a {
  grid-template-columns: 25px minmax(0, 1fr);
  gap: 10px;
  padding: 13px 12px;
  font-size: 1rem;
  line-height: 1.9;
}
html:not([lang=ar]) .course-reading .rail-subtitle,
html:not([lang=ar]) .course-reading .rail-back { font-size: .8rem; }
html:not([lang=ar]) .course-reading .rail-back {
  display: block;
  border-top: 1px solid var(--rule);
  padding-top: 18px;
  margin: 22px 12px 12px;
}

/* Give English study cards the same text scale and breathing room as Arabic. */
html:not([lang=ar]) .course-reading .material-card h2 { line-height: 1.6; }
html:not([lang=ar]) .course-reading .material-card p,
html:not([lang=ar]) .course-reading .material-action { font-size: .95rem; }
html:not([lang=ar]) .course-reading .material-action { line-height: 2; }
html:not([lang=ar]) .chapter-overview main.content > section li { font-size: .95rem; }
html:not([lang=ar]) .course-reading .section-label { font-size: .8rem; }

/* Comfortable reading and navigation on phones, including narrow devices. */
@media (max-width: 640px) {
  .course-reading #quarto-content {
    margin-inline: 0; width: 100%;
    grid-template-columns: [screen-start] 20px [body-start-outset body-start] minmax(0, 1fr) [body-end body-end-outset] 20px [screen-end];
  }
  .course-reading main.content { grid-column: body-start / body-end; margin-inline: 0; width: 100%; }
  .course-reading .navbar { padding-inline: 12px; }
  .course-reading .navbar-brand { font-size: 1.35rem; }
  .course-reading .navbar-brand span[lang=ar] { display: none; }
  .course-reading .quarto-secondary-nav .quarto-btn-toggle { min-width: 44px; min-height: 44px; }
  .course-reading .quarto-secondary-nav .breadcrumb { font-size: .75rem; }
  .course-reading .quarto-title h1.title { font-size: clamp(2rem, 8.5vw, 2.55rem); }
  .course-reading .chapter-language-switch { margin-block: -8px 12px; }
  .course-reading .folio-label { margin-bottom: 12px; }
  .course-reading .chapter-material-nav {
    display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0;
  }
  .course-reading .chapter-material-nav a,
  .course-reading .chapter-material-nav a:first-child {
    display: flex; align-items: center; justify-content: center;
    min-width: 0; min-height: 48px; padding: 10px 8px; font-size: .9rem;
  }
  .course-reading .chapter-material-nav a[aria-current] { background: #eae5d8; }
  .chapter-document main.content { font-size: 1rem; line-height: 1.8; }
  .chapter-document main.content > p:first-of-type { font-size: 1.12rem; line-height: 1.7; }
  .course-reading div.sourceCode pre { padding: 14px; font-size: .82rem; }
  .course-reading .math { display: inline-block; max-width: 100%; overflow-x: auto; vertical-align: middle; }
  .course-reading .math.display { display: block; }
  .course-reading .learning-objectives { padding: 20px 16px; }
  .course-reading .learning-objectives li { font-size: 1rem; }
  .course-reading .chapter-pagination { flex-direction: column; gap: 20px; margin-top: 40px; }
  .course-reading .chapter-pagination a { padding-block: 8px; }
  .course-reading .chapter-pagination a span { font-size: .7rem; }
  .course-reading .chapter-pagination a strong { font-size: 1.15rem; }
}

/* Use a direction-controlled SVG for breadcrumb separators too. */
.course-reading .quarto-secondary-nav .breadcrumb-item + .breadcrumb-item::before {
  content: "";
  display: inline-block;
  width: .8em;
  height: 1em;
  flex: 0 0 .8em;
  margin-inline-end: .33em;
  padding: 0;
  background-color: currentColor;
  -webkit-mask: url("assets/chevron.svg") center / contain no-repeat;
  mask: url("assets/chevron.svg") center / contain no-repeat;
}
html[lang=ar] .course-reading .quarto-secondary-nav .breadcrumb-item + .breadcrumb-item::before {
  transform: rotate(180deg);
  margin: 0;
}