/*
 * Design system for the /learn docs section. Scoped entirely under
 * body.learn-docs so it never leaks into the rest of the (Bootstrap-based)
 * site. Two-column fixed shell: a 320px sidebar + top bar, and a fluid
 * content column with a ~48rem reading measure.
 */

.learn-docs {
  --learn-ink-950: rgb(25, 16, 52);
  --learn-ink-900: rgb(34, 24, 60);
  --learn-ink-800: rgb(42, 24, 99);
  --learn-body: rgb(76, 78, 103);
  --learn-muted: rgb(150, 152, 182);
  --learn-border: rgba(86, 76, 115, 0.1);
  --learn-accent: #7c3aed;
  --learn-accent-ring: rgba(67, 56, 202, 0.25);
  --learn-code-bg: rgb(18, 18, 38);
  --learn-sidebar-w: 320px;
  --learn-topbar-h: 56px;

  background: #fff;
  color: var(--learn-body);
  font-family: "Inter", sans-serif;
  font-weight: 325;
  font-size: 16px;
  line-height: 1.6;
}

/* application.css gives every <a> a themed grey border-bottom-as-underline
   (`a { border-bottom: 2px solid #dee2e6; padding-bottom: 2px; }`). That
   rule's specificity is low enough to lose on properties this stylesheet
   redeclares, but border-bottom/padding-bottom are never redeclared below,
   so it survives untouched and shows up as a stray line under every sidebar
   and top-bar link. Reset it once here; .learn-prose opts back into a real
   underline explicitly. */
.learn-docs a {
  border-bottom: 0;
  padding-bottom: 0;
  text-decoration: none;
}

/* ---------- shell ---------- */

.learn-shell {
  min-height: 100%;
}

@media (min-width: 992px) {
  .learn-shell {
    margin-left: var(--learn-sidebar-w);
  }
}

/* ---------- top bar ---------- */

.learn-topbar {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1030;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  height: var(--learn-topbar-h);
  padding: 0 1rem;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: rgba(86, 75, 128, 0.1) 0 1px 0 0;
}

@media (min-width: 992px) {
  .learn-topbar {
    left: var(--learn-sidebar-w);
    justify-content: flex-end;
    padding: 0 2rem;
  }
}

.learn-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--learn-ink-950);
}

.learn-menu-toggle:hover {
  background: rgba(86, 76, 115, 0.08);
}

.learn-topbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--learn-ink-950);
  font-weight: 500;
}

.learn-topbar-brand img {
  height: 22px;
  width: auto;
}

.learn-topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.learn-topbar-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
  padding-right: 2rem;
  margin-right: 0.5rem;
  border-right: 1px solid var(--learn-border);
  font-size: 0.9rem;
  font-weight: 500;
}

@media (min-width: 576px) {
  .learn-topbar-links {
    display: flex;
  }
}

.learn-topbar-links a {
  color: var(--learn-ink-950);
  text-decoration: none;
}

.learn-topbar-links a:hover {
  color: var(--learn-accent);
}

.learn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 0 1rem;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
}

.learn-btn-outline {
  background: #fff;
  color: var(--learn-ink-950);
  border-color: rgba(91, 33, 182, 0.125);
  box-shadow: rgba(231, 230, 244, 1) 0 -3px 6px -2px inset;
}

.learn-btn-outline:hover {
  color: var(--learn-ink-950);
  border-color: rgba(91, 33, 182, 0.3);
}

.learn-btn-purple {
  background: var(--learn-accent);
  color: #fff;
  box-shadow: var(--learn-accent-ring) 0 0 0 1px inset;
}

.learn-btn-purple:hover {
  background: #6d28d9;
  color: #fff;
}

/* ---------- sidebar ---------- */

.learn-sidebar {
  --bs-offcanvas-width: 320px;
  background: #fff;
  border-right: 1px solid var(--learn-border);
  background-clip: padding-box;
}

.learn-sidebar .offcanvas-header {
  border-bottom: 1px solid var(--learn-border);
}

/* Bootstrap's `.offcanvas-lg .offcanvas-body` rule (2 classes) is more
   specific than a plain `.learn-sidebar-body` (1 class) and sets
   `padding: 0` at the lg breakpoint, which wins regardless of stylesheet
   order. Match it on the actual class pair carried by the element
   (offcanvas-body.learn-sidebar-body) so this padding always wins. */
.learn-sidebar .offcanvas-body.learn-sidebar-body {
  padding: 1rem 1.5rem 2rem;
}

@media (min-width: 992px) {
  /* Bootstrap's responsive offcanvas only strips the mobile drawer
     behavior at this breakpoint (transparent bg, header hidden) — it
     doesn't itself pin the panel to the viewport, so it collapses back
     into normal document flow as a full-width block. Re-fix it as the
     permanent left column the design calls for. */
  .learn-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1020;
    width: var(--learn-sidebar-w);
  }

  .learn-sidebar .offcanvas-body.learn-sidebar-body {
    display: block;
    flex-grow: 1;
    padding-top: 1rem;
    overflow-y: auto;
    max-height: 100vh;
  }
}

.learn-sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1rem;
  text-decoration: none;
}

.learn-sidebar-logo img {
  height: 28px;
  width: auto;
}

.learn-sidebar-logo span {
  font-family: "Fraunces", serif;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--learn-ink-950);
}

/* ---------- accordion nav ---------- */

.learn-nav {
  margin: 0 -0.75rem;
}

.learn-accordion {
  margin-bottom: 0.25rem;
}

.learn-accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.375rem 0.75rem;
  border: 0;
  border-radius: 8px;
  background: none;
  text-align: left;
  font-size: 0.90625rem;
  font-weight: 500;
  color: var(--learn-ink-950);
}

.learn-accordion-header:hover {
  background: rgba(86, 76, 115, 0.06);
}

.learn-accordion-chevron {
  font-size: 0.65rem;
  color: var(--learn-muted);
  transition: transform 0.2s ease;
}

.learn-accordion-header[aria-expanded="true"] .learn-accordion-chevron {
  transform: rotate(90deg);
}

.learn-accordion-list {
  list-style: none;
  margin: 0;
  padding: 0.125rem 0 0.5rem;
}

.learn-accordion-link {
  display: flex;
  align-items: center;
  min-height: 35px;
  padding: 0.375rem 0.75rem 0.375rem 1.5rem;
  border-radius: 8px;
  font-size: 0.90625rem;
  font-weight: 325;
  line-height: 1.4;
  color: var(--learn-body);
  text-decoration: none;
}

.learn-accordion-link:hover {
  background: rgba(86, 76, 115, 0.06);
  color: var(--learn-ink-950);
}

.learn-accordion-link.active {
  background: rgba(124, 58, 237, 0.08);
  color: var(--learn-accent);
  font-weight: 500;
}

/* ---------- main content ---------- */

.learn-main {
  padding: calc(var(--learn-topbar-h) + 2.5rem) 1.5rem 4rem;
}

@media (min-width: 992px) {
  .learn-main {
    padding-left: 3rem;
    padding-right: 3rem;
  }
}

.learn-content {
  max-width: 48rem;
  margin: 0 auto;
}

/* breadcrumb */

.learn-breadcrumb {
  margin-bottom: 1.5rem;
}

.learn-breadcrumb .breadcrumb {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 500;
}

.learn-breadcrumb .breadcrumb-item,
.learn-breadcrumb .breadcrumb-item a {
  color: var(--learn-muted);
  text-decoration: none;
}

.learn-breadcrumb .breadcrumb-item a:hover {
  color: var(--learn-accent);
}

.learn-breadcrumb .breadcrumb-item.active {
  color: var(--learn-body);
}

.learn-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
  color: var(--learn-muted);
}

/* page header (index + article) */

.learn-page-header {
  margin-bottom: 2rem;
}

.learn-lede {
  font-size: 1.0625rem;
  color: var(--learn-body);
  margin-top: 0.5rem;
}

.learn-article-header {
  margin-bottom: 1.5rem;
}

.learn-article-meta {
  font-size: 0.8125rem;
  color: var(--learn-muted);
  margin: 0.25rem 0 0;
}

/* index: section groups + article cards */

.learn-index-section {
  margin-bottom: 2.5rem;
}

.learn-index-section-link {
  color: inherit;
  text-decoration: none;
}

.learn-index-section-link:hover {
  color: var(--learn-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.learn-index-section-summary {
  font-size: 0.9375rem;
  color: var(--learn-body);
  line-height: 1.55;
  margin: -0.5rem 0 0;
}

.learn-article-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.learn-article-card {
  display: block;
  padding: 1rem 1.25rem;
  border: 1px solid var(--learn-border);
  border-radius: 10px;
  text-decoration: none;
  box-shadow: 0 1px 2px rgba(20, 10, 50, 0.03);
  transition: box-shadow 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.learn-article-card:hover {
  border-color: rgba(91, 33, 182, 0.25);
  box-shadow: rgba(91, 33, 182, 0.075) 0 10px 15px -3px, rgba(91, 33, 182, 0.075) 0 4px 6px -4px;
  transform: translateY(-1px);
}

.learn-article-card-title {
  display: block;
  font-weight: 500;
  font-size: 1rem;
  color: var(--learn-ink-950);
  margin-bottom: 0.25rem;
}

.learn-article-card-summary {
  display: block;
  font-size: 0.9rem;
  color: var(--learn-body);
  line-height: 1.55;
}

/* heading scale, shared by prose and standalone page headings */

.learn-h1,
.learn-prose h1 {
  font-family: "Fraunces", serif;
  font-size: 1.875rem;
  font-weight: 500;
  line-height: 2.375rem;
  letter-spacing: -0.028em;
  color: var(--learn-ink-900);
  margin: 0 0 0.75rem;
}

.learn-h2,
.learn-prose h2 {
  font-family: "Fraunces", serif;
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.99rem;
  letter-spacing: -0.023em;
  color: var(--learn-ink-900);
  margin: 2.5rem 0 1rem;
}

.learn-prose h3 {
  font-family: "Inter", sans-serif;
  font-size: 1.28rem;
  font-weight: 500;
  line-height: 2.05rem;
  letter-spacing: -0.006em;
  color: var(--learn-ink-800);
  margin: 2rem 0 0.75rem;
}

.learn-prose p {
  font-size: 1.0625rem;
  font-weight: 325;
  line-height: 1.7;
  color: var(--learn-body);
  margin: 0 0 1.25rem;
}

.learn-prose a {
  color: var(--learn-ink-950);
  text-decoration-line: underline;
  text-decoration-color: rgba(34, 24, 60, 0.3);
  text-underline-offset: 0.2em;
}

.learn-prose a:hover {
  text-decoration-color: var(--learn-accent);
}

/* Links back to the product itself read as the one call to action in a page of
   prose, so they carry the accent colour and extra weight. */
.learn-prose a[href*="mchip.org"] {
  color: var(--learn-accent);
  font-weight: 550;
  text-decoration-color: rgba(124, 58, 237, 0.35);
}

.learn-prose a[href*="mchip.org"]:hover {
  text-decoration-color: var(--learn-accent);
}

.learn-prose ul,
.learn-prose ol {
  padding-left: 1.25rem;
  margin: 0 0 1.25rem;
  color: var(--learn-body);
}

.learn-prose li {
  margin-bottom: 0.4rem;
  line-height: 1.7;
}

.learn-prose code {
  font-family: "Fragment Mono", monospace;
  font-size: 0.9em;
  background: rgba(86, 76, 115, 0.08);
  color: var(--learn-ink-900);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}

.learn-prose pre {
  background: var(--learn-code-bg);
  color: #fff;
  border-radius: 10px;
  padding: 1rem 1.5rem;
  overflow-x: auto;
  margin: 0 0 1.5rem;
}

.learn-prose pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 0.9375rem;
}

.learn-prose blockquote {
  background: #fff;
  color: var(--learn-ink-800);
  font-size: 0.9375rem;
  padding: 1rem 1.5rem;
  border-radius: 10px;
  box-shadow: rgba(91, 33, 182, 0.075) 0 10px 15px -3px, rgba(91, 33, 182, 0.075) 0 4px 6px -4px,
    rgba(91, 33, 182, 0.075) 0 0 0 1px;
  margin: 0 0 1.5rem;
}

.learn-prose blockquote p:last-child {
  margin-bottom: 0;
}

.learn-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5rem;
  font-size: 0.9375rem;
}

.learn-prose th,
.learn-prose td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--learn-border);
  text-align: left;
}

.learn-prose th {
  color: var(--learn-ink-950);
  font-weight: 500;
}

.learn-prose hr {
  border: 0;
  border-top: 1px solid var(--learn-border);
  margin: 2rem 0;
}

/* ---------- components (:::callout, :::steps, :::figure, :::comparison, :::related) ---------- */

.learn-callout {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--learn-border);
  margin: 0 0 1.5rem;
}

.learn-callout-icon {
  margin-top: 0.2rem;
  font-size: 0.9rem;
}

.learn-callout-body :last-child {
  margin-bottom: 0;
}

.learn-callout-note {
  background: rgba(124, 58, 237, 0.06);
}

.learn-callout-note .learn-callout-icon {
  color: var(--learn-accent);
}

.learn-callout-tip {
  background: rgba(16, 185, 129, 0.07);
  border-color: rgba(16, 185, 129, 0.2);
}

.learn-callout-tip .learn-callout-icon {
  color: rgb(5, 122, 85);
}

.learn-callout-warning {
  background: rgba(217, 119, 6, 0.08);
  border-color: rgba(217, 119, 6, 0.22);
}

.learn-callout-warning .learn-callout-icon {
  color: rgb(180, 83, 9);
}

.learn-callout-cta {
  background: rgba(124, 58, 237, 0.06);
  border-color: rgba(124, 58, 237, 0.16);
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.learn-callout-cta .learn-callout-body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  width: 100%;
}

.learn-callout-cta .learn-callout-body p {
  color: var(--learn-ink-950);
  font-weight: 500;
}

.learn-callout-cta .learn-btn {
  flex-shrink: 0;
  color: #fff;
  text-decoration: none;
}

.learn-steps {
  list-style: none;
  counter-reset: learn-steps;
  padding: 0;
  margin: 0 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.learn-steps-item {
  counter-increment: learn-steps;
  padding-left: 2.5rem;
  position: relative;
}

.learn-steps-item::before {
  content: counter(learn-steps);
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.1);
  color: var(--learn-accent);
  font-size: 0.8125rem;
  font-weight: 600;
}

.learn-steps-title {
  display: block;
  font-weight: 500;
  color: var(--learn-ink-950);
  margin-bottom: 0.25rem;
}

.learn-steps-body :last-child {
  margin-bottom: 0;
}

.learn-figure {
  margin: 0 0 1.5rem;
}

.learn-figure-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--learn-border);
}

.learn-figure-caption {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--learn-muted);
  text-align: center;
}

.learn-figure-caption :last-child {
  margin-bottom: 0;
}

.learn-comparison {
  overflow-x: auto;
  margin: 0 0 1.5rem;
}

.learn-comparison table {
  margin-bottom: 0;
}

.learn-related {
  margin: 2.5rem 0;
  padding: 1.25rem 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--learn-border);
  background: rgba(86, 76, 115, 0.03);
}

.learn-related-title {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--learn-muted);
  margin: 0 0 0.75rem;
}

.learn-related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.learn-related-link {
  color: var(--learn-ink-950);
  text-decoration: none;
  font-weight: 500;
}

.learn-related-link:hover {
  color: var(--learn-accent);
}

.learn-related-summary {
  margin: 0.125rem 0 0;
  font-size: 0.875rem;
  color: var(--learn-body);
}

.learn-cite {
  font-size: 0.6875em;
  line-height: 0;
  vertical-align: super;
  white-space: nowrap;
}

.learn-cite a {
  color: var(--learn-accent);
  text-decoration: none;
  font-weight: 600;
  padding: 0 0.05em;
}

.learn-cite a:hover {
  text-decoration: underline;
}

.learn-sources {
  margin: 2.5rem 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--learn-border);
}

.learn-sources-title {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--learn-muted);
  margin: 0 0 0.75rem;
}

.learn-sources-list {
  margin: 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  font-size: 0.875rem;
}

.learn-sources-item {
  color: var(--learn-muted);
  line-height: 1.5;
  scroll-margin-top: 5rem;
  border-radius: 4px;
}

/* Jumped to from a [1] marker — without this the reader lands on a list of
   near-identical rows with no cue which one they were sent to. */
.learn-sources-item:target {
  background: rgba(124, 58, 237, 0.09);
  box-shadow: 0 0 0 6px rgba(124, 58, 237, 0.09);
}

.learn-sources-cite {
  font-style: normal;
}

.learn-sources-link {
  color: var(--learn-body);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.learn-sources-link:hover {
  color: var(--learn-accent);
}

.learn-sources-note::before {
  content: " — ";
}

/* siblings + end strip */

.learn-siblings {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--learn-border);
}

.learn-siblings-title {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--learn-muted);
  margin-bottom: 0.75rem;
}

.learn-siblings-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.learn-siblings-link {
  color: var(--learn-ink-950);
  text-decoration: none;
  font-weight: 500;
}

.learn-siblings-link:hover {
  color: var(--learn-accent);
}

.learn-endstrip {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 1.5rem;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid #f3f4f6;
}

.learn-endstrip-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--learn-body);
  text-decoration: none;
}

.learn-endstrip-link:hover {
  color: var(--learn-accent);
}

.learn-endstrip-link i {
  margin-right: 0.375rem;
}