/* Phase 9 production tutorial/article layout ---------------------------- */
.tutorial-page {
  --container-width: 110rem;
  --page-gutter: clamp(.85rem, 2.8vw, 3rem);
  --tutorial-rail-top: 1rem;
  --tutorial-rail-bottom-gap: 1rem;
  background: var(--color-background);
}

.tutorial-page main { min-width: 0; }

.article-breadcrumbs {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.article-breadcrumbs ol {
  width: min(100%, var(--container-width));
  min-height: 3.2rem;
  margin-inline: auto;
  padding: .7rem var(--page-gutter);
  box-sizing: border-box;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .4rem;
  list-style: none;
}

.article-breadcrumbs li {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: var(--color-text-muted);
  font-size: .74rem;
}

.article-breadcrumbs li + li::before {
  color: #9aa6b7;
  content: "›";
}

.article-breadcrumbs a {
  color: var(--color-text-soft);
  text-decoration: none;
}

.article-breadcrumbs [aria-current="page"] {
  max-width: 34rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.development-fixture {
  margin: 1rem auto 0;
  padding: .72rem 1rem;
  border: 1px solid #f2c99f;
  border-radius: .6rem;
  background: #fff8ee;
  color: #87410f;
  font-size: .78rem;
}

html[data-theme="dark"] .development-fixture {
  border-color: #75431f;
  background: #342315;
  color: #ffc28f;
}

.tutorial-shell {
  padding-block: 1.2rem 2.4rem;
  display: grid;
  grid-template-columns: minmax(14.5rem, 17.5rem) minmax(0, 1fr) minmax(13rem, 15.5rem);
  gap: clamp(1rem, 2vw, 1.8rem);
  align-items: start;
}

.tutorial-shell > * { min-width: 0; }

.course-rail,
.context-rail {
  position: sticky;
  top: var(--tutorial-rail-top);
  min-width: 0;
  max-height: calc(100vh - var(--tutorial-rail-top) - var(--tutorial-rail-bottom-gap));
  max-height: calc(100dvh - var(--tutorial-rail-top) - var(--tutorial-rail-bottom-gap));
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: var(--color-border-strong) transparent;
  scrollbar-gutter: stable;
  scrollbar-width: thin;
}

/* Permanent tutorial-layout rule: desktop rails scroll independently so every
   sidebar item remains reachable without moving to the end of the article. */
.course-rail::-webkit-scrollbar,
.context-rail::-webkit-scrollbar { width: .55rem; }

.course-rail::-webkit-scrollbar-track,
.context-rail::-webkit-scrollbar-track { background: transparent; }

.course-rail::-webkit-scrollbar-thumb,
.context-rail::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: var(--color-border-strong);
  background-clip: padding-box;
}

.course-rail::-webkit-scrollbar-thumb:hover,
.context-rail::-webkit-scrollbar-thumb:hover { background-color: var(--color-text-muted); }

.course-rail {
  border: 1px solid var(--color-border);
  border-radius: .8rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.course-rail > details > summary {
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: .65rem;
  cursor: pointer;
  color: var(--color-text);
  font-weight: 700;
  list-style: none;
}

.course-rail > details > summary::-webkit-details-marker { display: none; }

.course-rail > details > summary::after {
  margin-left: auto;
  content: "+";
  font-size: 1.15rem;
}

.course-rail > details[open] > summary::after { content: "−"; }

.course-icon {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: linear-gradient(135deg, #27aee8, #0870bf);
  color: #fff;
  font-size: .66rem;
}

.course-progress { padding: 0 1rem 1rem; }
.course-progress__meta { display: flex; justify-content: space-between; color: var(--color-text-soft); font-size: .72rem; }

.course-rail__home-links {
  padding: 0 1rem .85rem;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .75rem;
  font-size: .68rem;
}

.course-rail__home-links a {
  color: var(--color-link);
  font-weight: 650;
  text-decoration: none;
}

.course-rail__home-links a:hover { text-decoration: underline; }

.course-rail__pillar-link {
  padding: .8rem;
  border-top: 1px solid var(--color-border);
}

.course-rail__pillar-link .button { width: 100%; }

.progress-track {
  height: .35rem;
  margin-top: .45rem;
  border-radius: 999rem;
  background: var(--color-surface-subtle);
  overflow: hidden;
}

.progress-track span {
  width: 35%;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: linear-gradient(90deg, #2967e9, #423fd7);
}

.course-search { padding: 0 1rem 1rem; }
.course-search label { display: block; }
.course-search input {
  width: 100%;
  min-height: 2.55rem;
  padding: .6rem .7rem;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .76rem;
}

.course-search__status {
  min-height: 1rem;
  margin: .35rem 0 0;
  color: var(--color-text-muted);
  font-size: .65rem;
}

.course-modules {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
  list-style: none;
}

.course-module { border-bottom: 1px solid var(--color-border); }
.course-module:last-child { border-bottom: 0; }
.course-module__control { margin: 0; }
.course-module button {
  width: 100%;
  min-height: 2.85rem;
  padding: .7rem 1rem;
  display: flex;
  justify-content: space-between;
  gap: .5rem;
  border: 0;
  background: transparent;
  color: var(--color-text);
  font-size: .76rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.course-module button > span:first-child { min-width: 0; }
.course-module__name { display: block; }
.course-module__stage {
  margin-top: .15rem;
  display: block;
  color: var(--color-text-muted);
  font-size: .6rem;
  font-weight: 500;
}

.course-module--nested {
  margin: .25rem 0 .4rem .45rem;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  background: var(--color-surface-subtle);
}

.course-module--current > .course-module__control > button { color: var(--color-link); }

.course-module button::after { content: "+"; }
.course-module button[aria-expanded="true"]::after { content: "−"; }
.course-module ol { margin: 0; padding: 0 .7rem .65rem; list-style: none; }
.course-module[hidden], .course-module ol[hidden] { display: none; }

.course-lesson a {
  min-height: 2.2rem;
  padding: .5rem .55rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: .45rem;
  border-radius: .45rem;
  color: var(--color-text-soft);
  font-size: .7rem;
  line-height: 1.35;
  text-decoration: none;
}

.course-lesson a:hover { background: var(--color-surface-subtle); color: var(--color-text); }
.course-lesson a[aria-current="page"] { background: #fff1e7; color: #d95400; font-weight: 700; }
html[data-theme="dark"] .course-lesson a[aria-current="page"] { background: #3c2718; color: #ffad75; }

.course-prerequisites {
  margin: .8rem;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  background: var(--color-surface-subtle);
}

.course-prerequisites summary {
  padding: .65rem .7rem;
  cursor: pointer;
  color: var(--color-text);
  font-size: .7rem;
  font-weight: 700;
}

.course-prerequisites ul { margin: 0; padding: 0 .7rem .7rem 1.65rem; }
.course-prerequisites li { margin-top: .35rem; color: var(--color-text-muted); font-size: .66rem; }
.course-prerequisites a { color: var(--color-link); }
.lesson-state { color: var(--color-green-500); font-weight: 800; }
.lesson-state--current { color: var(--color-orange-500); }

.learning-path-card {
  margin: 1rem;
  padding: .9rem;
  border: 1px solid var(--color-border);
  border-radius: .65rem;
  background: var(--color-surface-subtle);
}

.learning-path-card strong { display: block; margin-bottom: .25rem; font-size: .78rem; }
.learning-path-card p { margin: 0 0 .6rem; color: var(--color-text-muted); font-size: .66rem; }

.tutorial-article {
  min-width: 0;
  padding: 0 clamp(.2rem, 1vw, .8rem) 1rem;
  color: var(--color-text-soft);
  font-size: .87rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.article-heading {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.article-heading h1 {
  max-width: 48rem;
  margin: .7rem 0 .45rem;
  color: var(--color-text);
  font-size: clamp(2rem, 3.15vw, 3rem);
  line-height: 1.08;
}

.learning-path-badge {
  width: fit-content;
  padding: .35rem .7rem;
  display: inline-flex;
  border-radius: 999rem;
  background: #e5f7eb;
  color: #237848;
  font-size: .7rem;
  font-weight: 700;
}

html[data-theme="dark"] .learning-path-badge { background: #133d2b; color: #8fe0b4; }

.article-lede {
  max-width: 54rem;
  margin-bottom: .75rem;
  color: var(--color-text-soft);
  font-size: .92rem;
}

.article-meta,
.article-prerequisites,
.article-outcomes {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  list-style: none;
}

.article-meta li,
.article-prerequisites li {
  padding: .25rem .58rem;
  border: 1px solid var(--color-border);
  border-radius: 999rem;
  background: var(--color-surface);
  color: var(--color-text-soft);
  font-size: .66rem;
  font-weight: 600;
}

.article-prerequisites { margin-top: .75rem; align-items: center; }
.article-prerequisites::before { content: "Prerequisites:"; color: var(--color-text); font-size: .68rem; font-weight: 700; }

.article-outcomes {
  margin-top: 1rem;
  padding-top: .9rem;
  border-top: 1px solid var(--color-border);
  gap: .55rem 1.2rem;
}

.article-outcomes::before {
  width: 100%;
  content: "What You’ll Learn";
  color: var(--color-text);
  font-size: .82rem;
  font-weight: 700;
}

.article-outcomes li { min-width: 9rem; display: flex; gap: .45rem; color: var(--color-text); font-size: .7rem; }
.article-outcomes li::before { color: var(--color-green-500); content: "✓"; font-weight: 800; }

.article-toc {
  padding-block: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.article-toc h2 { margin-bottom: .45rem; font-size: .92rem; }
.article-toc ol { margin: 0; padding-left: 1.2rem; columns: 2; column-gap: 2.5rem; }
.article-toc li { padding-block: .15rem; break-inside: avoid; font-size: .72rem; }
.article-toc a { text-decoration: none; }

.article-content { padding-top: .35rem; }
.article-content section { scroll-margin-top: 6rem; }
.article-content section + section { margin-top: 1.1rem; }
.article-content h2 { margin: 0 0 .35rem; font-size: clamp(1.15rem, 2vw, 1.45rem); }
.article-content h3 { margin: .9rem 0 .3rem; font-size: 1rem; }
.article-content h4 { margin: .75rem 0 .25rem; }
.article-content p { margin-bottom: .65rem; }
.article-content :not(pre) > code {
  padding: .1rem .3rem;
  border: 1px solid var(--color-border);
  border-radius: .3rem;
  background: var(--color-surface-subtle);
  color: #ad3f00;
  font-size: .84em;
  overflow-wrap: anywhere;
}

html[data-theme="dark"] .article-content :not(pre) > code { color: #ffae76; }

.article-content ul,
.article-content ol { padding-left: 1.3rem; }
.article-content li + li { margin-top: .28rem; }
.article-content li > :is(ul, ol) { margin-top: .35rem; }

/* Genuine legacy Business Central/AL content translated into the Phase 9 shell. */
.legacy-tutorial-page .article-content {
  font-size: .9rem;
  line-height: 1.68;
}

.legacy-tutorial-page .article-content > .legacy-section,
.legacy-tutorial-page .article-content > .article-practical-check {
  margin-top: 1.35rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--color-border);
}

.legacy-tutorial-page .article-content > figure:first-child {
  margin-top: .75rem;
}

.legacy-section__body > :last-child,
.article-learning-context > :last-child,
.article-practical-check > :last-child {
  margin-bottom: 0;
}

.article-learning-context {
  margin: 1rem 0;
  padding: 1rem;
  border: 1px solid #9dc2f8;
  border-left: .28rem solid var(--color-blue-500);
  border-radius: .65rem;
  background: #f3f8ff;
}

.article-learning-context h2 {
  margin-bottom: .45rem;
  font-size: 1.05rem;
}

.article-learning-context h3 {
  margin-bottom: .25rem;
  font-size: .82rem;
}

.article-learning-context p {
  margin-bottom: .45rem;
  color: #23466f;
  font-size: .76rem;
}

.article-learning-context .sr-context-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
}

.article-learning-context .sr-context-grid > div {
  padding: .7rem;
  border-radius: .5rem;
  background: rgb(255 255 255 / 72%);
}

html[data-theme="dark"] .article-learning-context {
  border-color: #315c90;
  background: #0d294b;
}

html[data-theme="dark"] .article-learning-context p {
  color: #bbd8f7;
}

html[data-theme="dark"] .article-learning-context .sr-context-grid > div {
  background: rgb(0 0 0 / 14%);
}

.article-practical-check {
  margin-top: 1.5rem;
  padding: 1rem;
  border: 1px solid #91ddbe;
  border-radius: .65rem;
  background: #eefaf5;
}

.article-practical-check > h2 {
  color: #185e46;
}

.article-practical-check .sr-author-review {
  margin-top: .9rem;
  padding: .8rem;
  border-left: .22rem solid var(--color-green-500);
  background: rgb(255 255 255 / 72%);
}

html[data-theme="dark"] .article-practical-check {
  border-color: #28634f;
  background: #103127;
}

html[data-theme="dark"] .article-practical-check > h2 {
  color: #a4e4ca;
}

html[data-theme="dark"] .article-practical-check .sr-author-review {
  background: rgb(0 0 0 / 14%);
}

.legacy-tutorial-page .article-content img {
  width: 100%;
  height: auto;
}

.legacy-tutorial-page .article-content table:not(.article-table) {
  width: 100%;
  border-collapse: collapse;
}

.context-card--toc {
  max-height: min(70vh, 42rem);
  overflow: auto;
  scrollbar-width: thin;
}

.person-avatar--photo {
  object-fit: cover;
  object-position: center 20%;
}

.article-meta--legacy {
  flex-wrap: wrap;
}

.article-meta--legacy li {
  max-width: 100%;
  overflow-wrap: anywhere;
}

.code-sample {
  position: relative;
  margin: .65rem 0 .8rem;
  border: 1px solid #1f3d6e;
  border-radius: .65rem;
  background: #031631;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.code-sample__bar {
  min-height: 2.1rem;
  padding: .35rem .45rem .35rem .8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid rgb(255 255 255 / 12%);
  color: #b8c9e0;
  font-size: .65rem;
}

.code-copy {
  min-height: 1.55rem;
  padding: .25rem .5rem;
  border: 1px solid #587198;
  border-radius: .35rem;
  background: #0b2242;
  color: #e6eef9;
  font-size: .62rem;
  cursor: pointer;
}

.code-copy:hover { background: #15345e; }

.code-sample pre {
  max-width: 100%;
  max-height: 28rem;
  margin: 0;
  padding: .85rem 1rem 1rem;
  overflow: auto;
  color: #e8edf7;
  font-size: .72rem;
  line-height: 1.5;
  white-space: pre;
  tab-size: 4;
}

.code-keyword { color: #7ec8ff; }
.code-string { color: #ffd273; }
.code-comment { color: #62d98b; }

.article-callout {
  margin: .7rem 0;
  padding: .75rem .9rem .75rem 2.8rem;
  position: relative;
  border: 1px solid #9dc2f8;
  border-radius: .55rem;
  background: #f3f8ff;
  color: #23466f;
  font-size: .74rem;
}

.article-callout::before {
  position: absolute;
  top: .75rem;
  left: .85rem;
  width: 1.3rem;
  height: 1.3rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #2676e8;
  color: #fff;
  content: "i";
  font-weight: 800;
}

.article-callout strong { display: block; color: inherit; }
.article-callout p { margin: .15rem 0 0; }
.article-callout--tip { border-color: #91ddbe; background: #eefaf5; color: #21634c; }
.article-callout--tip::before { background: #2aa878; content: "✓"; }
.article-callout--warning { border-color: #f3c36a; background: #fff9e9; color: #745214; }
.article-callout--warning::before { background: #e79b15; content: "!"; }

html[data-theme="dark"] .article-callout { border-color: #315c90; background: #0d294b; color: #bbd8f7; }
html[data-theme="dark"] .article-callout--tip { border-color: #28634f; background: #103127; color: #a4e4ca; }
html[data-theme="dark"] .article-callout--warning { border-color: #775d26; background: #342b16; color: #f4d68c; }

.article-figure {
  margin: .75rem 0;
  border: 1px solid var(--color-border);
  border-radius: .6rem;
  background: var(--color-surface);
  overflow: hidden;
}

.article-figure img { width: 100%; height: auto; }
.article-figure figcaption { padding: .55rem .75rem; border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: .66rem; }

.table-scroll {
  max-width: 100%;
  margin: .7rem 0;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  overflow: auto;
}

.article-table {
  width: max(100%, 60rem);
  border-collapse: collapse;
  background: var(--color-surface);
  font-size: .7rem;
}

.article-table th,
.article-table td {
  padding: .65rem .75rem;
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}

.article-table th { background: var(--color-surface-subtle); color: var(--color-text); }
.article-table tr:last-child td { border-bottom: 0; }
.article-table :is(th, td):last-child { border-right: 0; }

.stress-string {
  padding: .65rem;
  border-left: .2rem solid var(--color-orange-500);
  background: var(--color-surface-subtle);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.article-summary-grid {
  margin: .9rem 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
}

.summary-card {
  padding: .75rem;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  background: var(--color-surface);
}

.summary-card--danger { border-color: #f5afb7; background: #fff5f6; }
.summary-card--success { border-color: #a7ddc6; background: #f1fbf6; }
html[data-theme="dark"] .summary-card--danger { border-color: #6b3440; background: #331d24; }
html[data-theme="dark"] .summary-card--success { border-color: #2c624f; background: #163027; }
.summary-card h3 { margin-bottom: .35rem; font-size: .84rem; }
.summary-card ul { margin: 0; padding-left: 1rem; font-size: .68rem; }

.article-faq { margin-top: .9rem; }
.article-faq details { border-top: 1px solid var(--color-border); }
.article-faq details:last-child { border-bottom: 1px solid var(--color-border); }
.article-faq summary { padding: .6rem .2rem; cursor: pointer; color: var(--color-text); font-size: .72rem; font-weight: 600; }
.article-faq details p { padding: 0 .2rem .7rem; }

.article-pagination {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .65rem;
}

.article-pagination :is(a, .article-pagination__terminal) {
  min-height: 4rem;
  padding: .65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .68rem;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.article-pagination__terminal {
  opacity: 0.72;
  cursor: default;
}

.article-pagination a:hover { border-color: #91b4f5; color: var(--color-link); }

.related-tutorials { margin-top: .9rem; }
.related-tutorials h2 { font-size: .9rem; }
.related-tutorials__grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .6rem; }
.related-tutorials a {
  min-width: 0;
  padding: .7rem;
  border: 1px solid var(--color-border);
  border-radius: .55rem;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .66rem;
  font-weight: 700;
  text-decoration: none;
}
.related-tutorials a span { display: block; margin-top: .2rem; color: var(--color-text-muted); font-size: .6rem; font-weight: 400; }

.context-rail { display: grid; gap: .8rem; }
.context-card {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: .7rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}
.context-card h2 { margin-bottom: .6rem; font-size: .86rem; }
.context-card p { margin-bottom: .45rem; color: var(--color-text-soft); font-size: .68rem; }
.context-card :last-child { margin-bottom: 0; }
.context-toc { margin: 0; padding-left: 1.1rem; }
.context-toc li { padding: .2rem 0; color: var(--color-text-muted); font-size: .66rem; }
.context-toc a { color: var(--color-text-soft); text-decoration: none; }
.context-toc a[aria-current="location"] { color: var(--color-link); font-weight: 700; }

.person-card { display: grid; grid-template-columns: 2.7rem minmax(0, 1fr); gap: .65rem; align-items: center; }
.person-avatar { width: 2.7rem; height: 2.7rem; display: grid; place-items: center; border-radius: 50%; background: linear-gradient(135deg, #ff8b35, #6748e9); color: #fff; font-size: .72rem; font-weight: 800; }
.person-card strong { display: block; color: var(--color-text); font-size: .72rem; }
.person-card small { display: block; color: var(--color-text-muted); font-size: .62rem; }

.tutorial-facts { margin: 0; }
.tutorial-facts div { padding: .4rem 0; display: flex; justify-content: space-between; gap: .65rem; border-bottom: 1px solid var(--color-border); font-size: .65rem; }
.tutorial-facts div:last-child { border-bottom: 0; }
.tutorial-facts dt { color: var(--color-text-muted); }
.tutorial-facts dd { margin: 0; color: var(--color-text); font-weight: 600; text-align: right; }

.share-actions { display: flex; flex-wrap: wrap; gap: .45rem; }
.share-actions :is(a, button) {
  min-width: 2.15rem;
  min-height: 2.15rem;
  padding: .4rem;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: .45rem;
  background: var(--color-surface);
  color: var(--color-link);
  font-size: .65rem;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.support-card { border-color: #d8c8ff; background: linear-gradient(145deg, #fbf8ff, #f4efff); }
.support-card .button { width: 100%; margin-top: .45rem; }
html[data-theme="dark"] .support-card { border-color: #4a3d73; background: linear-gradient(145deg, #221d3d, #29204b); }

@media (max-width: 56.25rem) {
  .tutorial-shell { grid-template-columns: 13rem minmax(0, 1fr); }
  .context-rail {
    position: static;
    grid-column: 2;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-height: none;
    overflow: visible;
    overscroll-behavior: auto;
    scrollbar-gutter: auto;
  }
  .context-card:first-child { grid-column: 1 / -1; }
}

@media (max-width: 42rem) {
  .tutorial-shell { grid-template-columns: 1fr; }
  .course-rail,
  .context-rail {
    position: static;
    grid-column: auto;
  }
  .course-rail {
    max-height: min(75dvh, 42rem);
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
  }
  .context-rail {
    max-height: none;
    overflow: visible;
    overscroll-behavior: auto;
    scrollbar-gutter: auto;
  }
  .course-rail > details:not([open]) > :not(summary) { display: none; }
  .context-rail { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .context-card:first-child { grid-column: 1 / -1; }
}

@media (max-width: 48rem) {
  .article-breadcrumbs [aria-current="page"] { max-width: 16rem; }
  .tutorial-article { padding-inline: 0; font-size: .84rem; }
  .article-heading h1 { font-size: clamp(1.8rem, 9vw, 2.5rem); }
  .article-toc ol { columns: 1; }
  .article-summary-grid,
  .context-rail { grid-template-columns: 1fr; }
  .context-card:first-child { grid-column: auto; }
  .article-pagination { grid-template-columns: 1fr; }
  .related-tutorials__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-learning-context .sr-context-grid { grid-template-columns: 1fr; }
}

@media (max-width: 30rem) {
  .article-breadcrumbs li:nth-child(3),
  .article-breadcrumbs li:nth-child(4) { display: none; }
  .article-breadcrumbs li:nth-child(5)::before { content: "… ›"; }
  .article-breadcrumbs--compact li:nth-child(4) { display: inline-flex; }
  .article-breadcrumbs--compact li:nth-child(4)::before { content: "… ›"; }
  .article-meta li,
  .article-prerequisites li { font-size: .62rem; }
  .related-tutorials__grid { grid-template-columns: 1fr; }
  .code-sample pre { padding-inline: .75rem; font-size: .67rem; }
}