@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-sans-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-sans-latin-500-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-sans-latin-600-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-sans-latin-700-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2');
}

/* Runtime owner of the learning-series tokens documented in DESIGN.md. */

:root {
  --learn-accent: #2859ce;
  --learn-tint: #edf2fc;
  --learn-surface: #fff;
  --learn-text: #202936;
  --learn-muted: #596777;
  --learn-line: #dce2e9;
  --learn-code: #f8fafc;
  --learn-focus: #2859ce;
  --learn-scrollbar: #8996a8;
  --topic-start: #175fc5;
  --topic-end: #16499d;
  --topic-text: #fff;

  scrollbar-color: var(--learn-scrollbar) transparent;
  scrollbar-width: thin;
  scrollbar-gutter: stable;
}

:root.dark {
  --learn-accent: #7dd3fc;
  --learn-tint: #0c3049;
  --learn-surface: #151d2a;
  --learn-text: #e2e8f0;
  --learn-muted: #a8b9ce;
  --learn-line: #344257;
  --learn-code: #111c2d;
  --learn-focus: #7dd3fc;
  --learn-scrollbar: #64748b;
}

/* Guide accents match their catalogue cards. */

.learning-custom {
  --topic-start: #0b7b80;
  --topic-end: #0b5965;
  --learn-accent: #0f766e;
  --learn-tint: #ccfbf1;
  --learn-focus: #0d9488;
}

.dark .learning-custom {
  --learn-accent: #5eead4;
  --learn-tint: #123a39;
  --learn-focus: #2dd4bf;
}

.learning-llm {
  --topic-start: #713bbc;
  --topic-end: #50319b;
  --learn-accent: #6d28d9;
  --learn-tint: #ede9fe;
  --learn-focus: #7c3aed;
}

.dark .learning-llm {
  --learn-accent: #c4b5fd;
  --learn-tint: #2e2049;
  --learn-focus: #a78bfa;
}

.learning-django {
  --topic-start: #08785e;
  --topic-end: #075c49;
  --learn-accent: #047857;
  --learn-tint: #d1fae5;
  --learn-focus: #059669;
}

.dark .learning-django {
  --learn-accent: #6ee7b7;
  --learn-tint: #123a30;
  --learn-focus: #34d399;
}

.learning-redis {
  --topic-start: #c43747;
  --topic-end: #962c44;
  --learn-accent: #b91c1c;
  --learn-tint: #fee2e2;
  --learn-focus: #dc2626;
  --redis-logo: #dc2626;
}

.dark .learning-redis {
  --learn-accent: #fca5a5;
  --learn-tint: #431c24;
  --learn-focus: #f87171;
  --redis-logo: #f87171;
}

.home .card.redis-card > svg {
  flex-shrink: 0;
}

.redis-guide-title {
  display: flex;
  align-items: center;
  gap: 18px;
}

.redis-guide-logo {
  flex-shrink: 0;
  color: var(--redis-logo);
  font-size: clamp(44px, 5vw, 64px);
  line-height: 1;
}

.redis-guide-logo svg {
  display: block;
  width: 1em;
  height: 1em;
}

@media (width <= 600px) {
  .redis-guide-title {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

.series-is-open {
  overflow: hidden;
}

.series-dialog {
  position: fixed;
  inset: auto;
  margin: 0;
  padding: 0;
  max-width: calc(100vw - 32px);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--learn-line);
  border-radius: 8px;
  color: var(--learn-text);
  background: var(--learn-surface);
  box-shadow: 0 24px 80px rgb(15 23 42 / 25%);
}

.series-dialog[data-preparing] {
  opacity: 0;
}

.series-dialog[open]:not([data-preparing]) {
  animation: series-appear 180ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.series-dialog::backdrop {
  background: rgb(15 23 42 / 48%);
  animation: series-backdrop 180ms ease-out both;
}

.series-dialog-body {
  padding: 24px;
}

.series-dialog-heading {
  margin-bottom: 16px;
}

.series-dialog h2 {
  font-size: 20px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.035em;
}

.series-options {
  padding: 4px;
}

.learning-page {
  max-width: 1440px;
  margin: 0 auto;
  padding: 36px 40px 80px;
  color: var(--learn-text);
}

.learning-header {
  max-width: 720px;
  padding: 0 0 32px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--learn-line);
}

.learning-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  color: var(--learn-muted);
  font-size: 13px;
  margin-bottom: 38px;
}

.learning-breadcrumb a {
  padding: 4px 0;
}

.learning-page a {
  cursor: pointer;
}

.learning-page a:hover {
  color: var(--learn-accent);
}

.learning-header h1 {
  font-size: clamp(30px, 3.2vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  font-weight: 600;
}

.learning-deck {
  max-width: 740px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--learn-muted);
  margin-top: 18px;
}

.learning-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 12px;
  color: var(--learn-muted);
  margin-top: 24px;
}

.learning-meta a {
  color: var(--learn-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Reading has two independent margins: course on the left, page on the right. */
.learning-layout {
  position: relative;
  display: grid;
  grid-template-columns: 220px minmax(0, 720px) 200px;
  grid-template-areas: 'course reading page';
  justify-content: center;
  gap: 40px;
}

.learning-sidebar {
  grid-area: course;
}

.learning-page-sidebar {
  grid-area: page;
}

.learning-navigation {
  position: sticky;
  top: calc(var(--site-navbar-height) + 24px);
  align-self: start;
  min-width: 0;
  /* Reserve the header and breadcrumb even before the margins become sticky. */
  max-height: calc(100dvh - 200px);
  overflow: auto;
  padding: 4px;
  color: var(--learn-muted);
  font-size: 13px;
}

.learning-navigation summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 8px 12px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.5;
  list-style: none;
}

.learning-navigation summary::-webkit-details-marker {
  display: none;
}

.learning-navigation summary::after {
  content: '';
  flex: 0 0 6px;
  width: 6px;
  height: 6px;
  margin-right: 2px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
}

.learning-navigation details[open] > summary::after {
  transform: rotate(225deg);
}

.learning-navigation summary:hover {
  color: var(--learn-text);
}

.learning-navigation ol {
  margin: 0;
}

.learning-navigation a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 8px;
  border-left: 1px solid transparent;
  font-size: 13px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.learning-navigation a:hover {
  color: var(--learn-text);
  background: var(--learn-code);
}

.learning-navigation a[aria-current] {
  color: var(--learn-text);
  border-color: var(--learn-accent);
  font-weight: 500;
}

.learning-navigation .chapter-number {
  flex: 0 0 20px;
  color: var(--learn-muted);
  font: 11px var(--study-mono);
}

.learning-navigation .course-overview-link {
  margin-bottom: 8px;
}

.learning-page-sidebar nav {
  border-left: 1px solid var(--learn-line);
}

.learning-on-page a {
  margin-left: -1px;
  padding-left: 14px;
}

.learning-compact-label {
  display: none;
}

.learning-reading {
  grid-area: reading;
  min-width: 0;
}

.learning-content {
  font-size: 17px;
  line-height: 1.85;
  overflow-wrap: anywhere;
}

.learning-content .h2-wrap {
  margin: 0 0 48px;
}

.learning-content [id] {
  scroll-margin-top: calc(var(--site-navbar-offset, 0px) + 24px);
}

.learning-content .h2-wrap > h2 {
  font-size: 25px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.025em;
  margin-bottom: 22px;
}

.learning-content .h3-wrap {
  margin: 24px 0;
}

.learning-content .h3-wrap > h3 {
  font-size: 19px;
  line-height: 1.4;
  font-weight: 600;
  margin: 26px 0 12px;
}

.learning-content h4 {
  font-weight: 600;
  margin: 24px 0 8px;
}

.learning-content p {
  margin: 14px 0;
}

.learning-content a {
  color: var(--learn-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.learning-content a:hover {
  text-decoration-thickness: 2px;
}

.learning-content .h-anchor {
  margin-right: 8px;
  font-size: 0.7em;
  text-decoration: none;
  opacity: 0.65;
}

.learning-content ul,
.learning-content ol {
  display: block;
  padding-left: 24px;
  margin: 14px 0;
  list-style: disc;
}

.learning-content ol {
  list-style: decimal;
}

.learning-content li {
  margin: 6px 0;
  padding-left: 3px;
}

.learning-content li::marker {
  color: var(--learn-accent);
}

.learning-content code {
  font-size: 0.87em;
  color: var(--learn-accent);
}

.learning-content :not(pre) > code {
  background: var(--learn-tint);
  padding: 2px 4px;
  border-radius: 4px;
}

.learning-content pre {
  position: relative;
  margin: 18px 0;
  padding: 22px;
  background: var(--learn-code);
  border: 1px solid var(--learn-line);
  border-radius: 6px;
  white-space: pre;
  line-height: 1.65;
  overflow: auto;
  max-width: 100%;
}

.learning-content pre:has(.learning-copy) {
  padding-top: 50px;
}

.learning-content pre > code {
  color: var(--learn-text);
  overflow: visible;
  background: transparent;
  white-space: pre;
  overflow-wrap: normal;
  word-wrap: normal;
  font-size: 13px;
}

.learning-content blockquote {
  margin: 24px 0;
  padding: 8px 22px;
  border-left: 3px solid var(--learn-accent);
  background: var(--learn-tint);
  border-radius: 0 8px 8px 0;
}

.learning-content table {
  display: block;
  overflow-x: auto;
  overflow-wrap: normal;
  max-width: 100%;
  width: 100%;
  margin: 20px 0;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.learning-content th,
.learning-content td {
  min-width: 125px;
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--learn-line);
  vertical-align: top;
}

.learning-content th {
  background: var(--learn-tint);
  font-weight: 600;
}

.learning-content details {
  margin: 20px 0;
  padding: 16px 20px;
  border: 1px solid var(--learn-line);
  border-radius: 6px;
  background: var(--learn-surface);
}

.learning-content summary {
  cursor: pointer;
  font-weight: 600;
}

.learning-content summary:hover {
  color: var(--learn-accent);
}

.learning-copy {
  position: absolute;
  right: 10px;
  top: 10px;
  min-width: 72px;
  min-height: 32px;
  padding: 2px 10px;
  border: 1px solid var(--learn-line);
  border-radius: 6px;
  font: 12px/1.5 var(--study-sans);
  color: var(--learn-accent);
  background: var(--learn-surface);
  cursor: pointer;
}

.learning-copy:hover {
  background: var(--learn-tint);
}

.learning-copy:active {
  transform: translateY(1px);
}

.learning-copy-status {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  max-width: calc(100vw - 32px);
  background: var(--learn-surface);
  border: 1px solid var(--learn-line);
  border-radius: 8px;
  box-shadow: 0 4px 20px rgb(15 23 42 / 12%);
  font-size: 13px;
  line-height: 1.5;
  padding: 10px 16px;
}

.learning-copy-status:empty {
  display: none;
}

.learning-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  border-top: 1px solid var(--learn-line);
  padding-top: 28px;
  margin-top: 48px;
}

.learning-pagination a {
  color: var(--learn-text);
  padding: 8px 0;
}

.learning-pagination a:last-child {
  text-align: right;
}

.learning-pagination small {
  display: block;
  color: var(--learn-muted);
  font-size: 12px;
  margin-bottom: 6px;
}

.learning-pagination strong {
  font-size: 16px;
}

:is(
    [data-series-trigger],
    .series-dialog a,
    .series-dialog button,
    .learning-page a,
    .learning-page button,
    .learning-page summary,
    .learning-content pre,
    .learning-content table
  ):focus-visible {
  outline: 3px solid var(--learn-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.dark .learning-content [class^='hljs-'] {
  color: var(--learn-text);
}

.dark .learning-content :is(.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-meta) {
  color: #7dd3fc;
}

.dark .learning-content :is(.hljs-string, .hljs-attr, .hljs-title, .hljs-built_in) {
  color: #a5d6b3;
}

.dark .learning-content :is(.hljs-number, .hljs-variable, .hljs-symbol) {
  color: #fcd34d;
}

.dark .learning-content .hljs-comment {
  color: var(--learn-muted);
}

@keyframes series-appear {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes series-backdrop {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@media (width <= 1200px) {
  .learning-page {
    padding: 20px 20px 60px;
  }

  .learning-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-areas: 'course page' 'reading reading';
    gap: 28px 12px;
  }

  .learning-navigation {
    position: static;
    max-height: none;
    overflow: visible;
    padding: 0;
    border-bottom: 1px solid var(--learn-line);
  }

  .learning-navigation summary {
    min-height: 44px;
    padding: 10px 8px;
  }

  .learning-navigation nav {
    position: absolute;
    z-index: 20;
    top: 52px;
    left: 0;
    right: 0;
    max-height: min(60dvh, 440px);
    overflow: auto;
    padding: 12px;
    background: var(--learn-surface);
    border: 1px solid var(--learn-line);
    border-radius: 6px;
    box-shadow: 0 8px 24px rgb(15 23 42 / 10%);
  }

  .learning-navigation a {
    min-height: 44px;
    align-items: center;
    padding: 10px 12px;
    font-size: 14px;
  }

  .learning-course-title,
  .learning-page-title {
    display: none;
  }

  .learning-compact-label {
    display: inline;
  }

  .learning-content {
    font-size: 16px;
  }

  .learning-content .h2-wrap > h2 {
    font-size: 24px;
  }

  .learning-breadcrumb {
    margin-bottom: 28px;
  }
}

@media (width <= 480px) {
  .series-dialog-body {
    padding: 20px 16px;
  }

  .learning-header h1 {
    font-size: 30px;
  }

  .learning-deck {
    font-size: 16px;
  }

  .learning-content pre {
    padding: 16px;
  }

  .learning-content pre > code {
    font-size: 12px;
  }

  .learning-pagination {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html.scrollbar {
    scroll-behavior: auto;
  }

  .series-dialog[open]:not([data-preparing]),
  .series-dialog::backdrop {
    animation: none;
  }
}

@media (forced-colors: active) {
  :root {
    scrollbar-color: auto;
  }

  .series-dialog::backdrop {
    backdrop-filter: none;
  }
}

@media print {
  body > header,
  body > footer,
  .learning-navigation,
  .learning-copy,
  .learning-copy-status,
  .learning-pagination,
  .learning-meta a {
    display: none !important;
  }

  .learning-layout {
    display: block;
  }

  .learning-page {
    max-width: none;
    padding: 0;
  }

  .learning-content pre,
  .learning-content pre > code {
    white-space: pre-wrap;
  }

  .learning-content details {
    -moz-column-break-inside: avoid;
    break-inside: avoid;
  }
}

/* Shared study shell, adapted from Sistemas agénticos. */
:root {
  --study-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --study-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --study-background: #f5f7fa;
  --site-navbar-height: 64px;
  --site-navbar-offset: 64px;
  --learn-scrollbar-track: transparent;
  --learn-scrollbar-hover: #596777;
  --learn-scrollbar-active: #2859ce;
  --series-card-min: 200px;
  --series-gap: 12px;

  color-scheme: light;
  scroll-padding-top: 12px;
}

:root.dark {
  --study-background: #101722;
  --learn-scrollbar-hover: #a8b9ce;
  --learn-scrollbar-active: #7dd3fc;

  color-scheme: dark;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--learn-scrollbar) var(--learn-scrollbar-track);
}

::-webkit-scrollbar {
  width: 9px;
  height: 9px;
}

::-webkit-scrollbar-track {
  background: var(--learn-scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--learn-scrollbar);
  border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--learn-scrollbar-hover);
}

::-webkit-scrollbar-thumb:active {
  background: var(--learn-scrollbar-active);
}

.study-site {
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  font-family: var(--study-sans);
  color: var(--learn-text);
  background: var(--study-background);
}

.study-site code,
.study-site pre,
.study-site kbd {
  font-family: var(--study-mono);
}

.study-site :is(button, summary, a) {
  cursor: pointer;
}

.study-site button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.study-site :is(a, button, summary, input, [tabindex='0']):focus-visible {
  outline: 2px solid var(--learn-focus);
  outline-offset: 3px;
}

.study-site :is(button, a):active {
  opacity: 0.85;
}

.study-skip {
  position: fixed;
  left: 16px;
  top: -100px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--learn-surface);
  border: 1px solid var(--learn-focus);
}

.study-skip:focus {
  top: 8px;
}

.study-header {
  position: sticky;
  top: 0;
  z-index: 45;
  background: var(--learn-surface);
  border-bottom: 1px solid var(--learn-line);
}

.site-navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--site-navbar-height);
  padding: 0 26px;
}

.study-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.3;
  flex-shrink: 0;
}

.study-brand-mark {
  display: grid;
  place-items: center;
  height: 32px;
  width: 32px;
  border: 1px solid var(--learn-line);
  border-radius: 6px;
  background: var(--learn-tint);
  color: var(--learn-accent);
  font: 12px var(--study-mono);
}

.study-brand:hover {
  color: var(--learn-accent);
}

.study-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.study-search-trigger,
.study-control {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid var(--learn-line);
  border-radius: 5px;
  background: var(--learn-surface);
  color: var(--learn-muted);
  height: 36px;
  padding: 0 10px;
  font-size: 12px;
}

.study-search-trigger {
  width: 280px;
  justify-content: flex-start;
}

.study-search-trigger kbd {
  margin-left: auto;
  font-size: 10px;
  border: 1px solid var(--learn-line);
  border-radius: 3px;
  padding: 1px 4px;
}

.study-control {
  width: 36px;
  padding: 0;
  font-size: 18px;
}

.study-header-actions svg {
  height: 16px;
  width: 16px;
}

.study-search-trigger:hover,
.study-control:hover {
  background: var(--learn-code);
  color: var(--learn-accent);
  border-color: var(--learn-focus);
}

.study-main {
  min-width: 0;
  flex: 1;
  background: var(--learn-surface);
}

.learning-page-cards .learning-content > .h2-wrap {
  background: transparent;
  padding: 0 0 36px;
  margin-bottom: 36px;
  border: 0;
  border-bottom: 1px solid var(--learn-line);
  border-radius: 0;
}

.learning-content > .h2-wrap:last-of-type {
  border-bottom: 0;
}

.learning-content .h2-wrap > h2 {
  font-weight: 600;
}

.learning-content .h-anchor {
  font-size: 0.65em;
  opacity: 0.5;
}

.learning-content .h-anchor:hover,
.learning-content .h-anchor:focus-visible {
  opacity: 1;
}

.learning-header h1 {
  text-wrap: balance;
}

.learning-content pre {
  tab-size: 4;
}

.learning-content [id] {
  scroll-margin-top: calc(var(--site-navbar-height) + 20px);
}

.study-catalogue-main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 52px 44px 72px;
}

.study-page-heading {
  margin-bottom: 38px;
  max-width: 760px;
}

.study-page-heading h1 {
  font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.study-catalogue-main .catalogue {
  width: 100%;
}

.catalogue-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 32px;
}

.catalogue-group {
  min-width: 0;
}

.catalogue-group-custom {
  grid-column: 1 / -1;
}

.catalogue-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
  font-size: 16px;
  font-weight: 500;
  color: var(--learn-text);
}

.catalogue-heading::after {
  content: '';
  height: 2px;
  flex: 1;
  background: var(--learn-tint);
}

.catalogue-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr));
  gap: 16px;
  min-width: 0;
}

.catalogue-group-custom .catalogue-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.catalogue .study-topic .card {
  min-height: 88px;
  gap: 12px;
  padding: 16px 36px 16px 16px;
}

.catalogue .study-topic .card > svg {
  width: 28px;
  height: 28px;
}

.catalogue .study-topic-copy strong {
  font-size: 17px;
}

.catalogue .study-topic-copy small {
  margin-top: 4px;
}

.study-topic {
  min-width: 0;
  display: block;
}

.study-topic .card {
  display: flex;
  align-items: center;
  position: relative;
  gap: 14px;
  width: 100%;
  min-height: 68px;
  height: 100%;
  border: 1px solid var(--topic-start);
  border-radius: 9px;
  padding: 16px 30px 16px 16px;
  background: linear-gradient(115deg, var(--topic-start), var(--topic-end));
  color: var(--topic-text);
  box-shadow: none;
  transition:
    transform 150ms ease,
    box-shadow 150ms ease;
}

.study-topic .card::after {
  content: '›';
  position: absolute;
  right: 20px;
  color: var(--topic-text);
  font-size: 20px;
}

.study-topic[aria-haspopup='dialog'] .card::after {
  content: '⌄';
}

.study-topic .card > svg {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: inherit;
}

.study-topic .card > p,
.study-topic-copy strong {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
}

.study-topic-copy small {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
}

.study-topic:hover .card,
.study-topic:focus-visible .card {
  box-shadow: 0 3px 12px rgb(15 23 42 / 14%);
}

.study-topic:active .card {
  transform: translateY(0);
}

.series-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--series-card-min)), 1fr));
  gap: var(--series-gap);
  padding: 4px;
}

.custom-guides {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.custom-guide > p {
  color: var(--learn-muted);
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.8;
}

.study-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--learn-line);
  padding: 24px 44px;
  color: var(--learn-muted);
  font-size: 11px;
}

.study-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

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

#share-menu {
  padding: 6px;
  width: 224px;
  max-height: calc(100dvh - 88px);
  overflow-y: auto;
  background: var(--learn-surface);
  color: var(--learn-text);
  border: 1px solid var(--learn-line);
  border-radius: 6px;
  box-shadow: 0 6px 24px #0002;
}

#share-menu .share-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  width: 100%;
  font: 13px var(--study-sans);
  text-align: left;
  border-radius: 4px;
}

#share-menu .share-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

#share-menu .share-item:hover {
  background: var(--learn-tint);
  color: var(--learn-accent);
}

@media (width <= 1200px) {
  .learning-page {
    max-width: 800px;
    padding: 32px;
  }

  .study-catalogue-main {
    padding: 36px 32px 60px;
  }
}

@media (width <= 760px) {
  .site-navbar {
    padding: 0 16px;
    gap: 12px;
  }

  .study-brand {
    font-size: 15px;
  }

  .study-search-trigger {
    width: 36px;
    padding: 0;
    justify-content: center;
  }

  .study-search-trigger span,
  .study-search-trigger kbd {
    display: none;
  }

  .study-header-actions {
    gap: 6px;
  }

  .study-footer {
    padding: 24px 20px;
  }

  .learning-page,
  .study-catalogue-main {
    padding: 28px 22px 48px;
  }

  .learning-breadcrumb {
    font-size: 11px;
    margin-bottom: 28px;
    gap: 7px;
  }

  .learning-deck {
    font-size: 16px;
  }

  .learning-content {
    font-size: 16px;
  }

  .learning-content .h2-wrap > h2 {
    font-size: 23px;
  }

  .learning-page-cards .learning-content > .h2-wrap {
    margin-bottom: 28px;
    padding-bottom: 28px;
  }

  .catalogue-content,
  .catalogue-group-custom .catalogue-grid {
    grid-template-columns: 1fr;
  }

  .catalogue-content {
    gap: 26px;
  }

  .catalogue-group-custom .catalogue-grid {
    gap: 16px;
  }

  .catalogue .study-topic .card {
    min-height: 80px;
    padding: 14px 36px 14px 16px;
  }

  .study-topic .card > p,
  .study-topic-copy strong {
    font-size: 16px;
  }

  .custom-guides {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@media (forced-colors: active) {
  * {
    scrollbar-color: auto;
  }

  .learning-navigation a[aria-current] {
    outline: 1px solid Highlight;
  }
}

@media print {
  .study-header,
  .study-footer,
  .study-skip {
    display: none !important;
  }

  .learning-page {
    max-width: none;
    padding: 0;
  }

  .learning-content {
    font-size: 11pt;
  }

  .learning-page-cards .learning-content > .h2-wrap {
    break-inside: auto;
  }
}

/* Search retains guide previews and section links in one native modal. */
#mysearch {
  width: min(960px, calc(100vw - 32px));
  height: min(680px, calc(100dvh - 64px));
  max-width: none;
  max-height: none;
  margin: auto;
  padding: 0;
  border: 1px solid var(--learn-line);
  border-radius: 8px;
  color: var(--learn-text);
  background: var(--learn-surface);
  box-shadow: 0 16px 60px #0003;
}

#mysearch::backdrop {
  background: rgb(15 23 42 / 50%);
}

#mysearch-box {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}

.study-search-bar {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--learn-line);
}

.study-search-label {
  color: var(--learn-muted);
  flex-shrink: 0;
}

.study-search-label svg {
  width: 18px;
  height: 18px;
}

#mysearch-input {
  min-width: 0;
  flex: 1;
  width: 100%;
  font: 16px var(--study-sans);
  color: var(--learn-text);
  background: transparent;
  padding: 8px 0;
  border: 0;
  outline-offset: 2px;
}

#mysearch-input::-webkit-search-cancel-button {
  display: none;
}

#mysearch-input::placeholder {
  color: var(--learn-muted);
}

.study-search-close {
  font-size: 12px;
  color: var(--learn-muted);
  padding: 8px;
}

.study-search-close:hover {
  color: var(--learn-accent);
}

.study-search-close kbd {
  border: 1px solid var(--learn-line);
  padding: 1px 3px;
  margin-left: 5px;
  border-radius: 3px;
  font-size: 10px;
}

.study-search-feedback {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 12px 20px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--learn-muted);
  border-bottom: 1px solid var(--learn-line);
}

#mysearch-retry {
  color: var(--learn-accent);
  text-decoration: underline;
}

.study-search-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
  flex: 1;
}

.study-search-results,
#mysearch .preview-panel {
  overflow-y: auto;
  min-width: 0;
  overscroll-behavior: contain;
}

#mysearch .preview-panel {
  display: block;
  border-left: 1px solid var(--learn-line);
  background: var(--learn-code);
  font-size: 13px;
}

#mysearch-list > li > a {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  color: var(--learn-text);
  border-bottom: 1px solid var(--learn-line);
}

#mysearch-list .study-result-icon {
  display: grid;
  place-items: center;
  height: 32px;
  width: 32px;
  flex-shrink: 0;
  color: var(--learn-accent);
}

#mysearch-list .study-result-icon svg {
  width: 22px;
  height: 22px;
}

#mysearch-list .study-result-copy {
  display: block;
  min-width: 0;
  margin-left: 12px;
}

#mysearch-list .study-result-copy strong {
  display: block;
  font-size: 14px;
  line-height: 1.6;
  font-weight: 500;
}

#mysearch-list .study-result-copy small {
  display: block;
  font-size: 11px;
  line-height: 1.6;
  margin-top: 5px;
  color: var(--learn-muted);
  overflow-wrap: anywhere;
}

#mysearch-list li.active > a,
#mysearch-list > li > a:hover {
  background: var(--learn-tint);
  color: var(--learn-accent);
}

#mysearch-list :is(.text-slate-500, .text-slate-600, .text-slate-300) {
  color: var(--learn-muted);
}

#mysearch-list mark {
  background: transparent;
  color: inherit;
  font-weight: 600;
}

#mysearch .preview-panel a {
  color: var(--learn-text);
}

#mysearch .preview-panel a:hover {
  background: var(--learn-tint);
  color: var(--learn-accent);
}

.study-search-hint {
  flex-shrink: 0;
  border-top: 1px solid var(--learn-line);
  padding: 10px 20px;
  font-size: 11px;
  color: var(--learn-muted);
}

#mysearch [hidden] {
  display: none;
}

@media (width <= 760px) {
  #mysearch {
    width: calc(100vw - 24px);
    height: calc(100dvh - 40px);
  }

  .study-search-bar {
    padding: 10px;
    gap: 6px;
  }

  .study-search-close kbd {
    display: none;
  }

  .study-search-body {
    grid-template-columns: 1fr;
  }

  #mysearch .preview-panel {
    display: none;
  }

  .study-search-hint {
    display: none;
  }
}

#mysearch mark {
  background: transparent;
  color: inherit;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--learn-accent);
  text-underline-offset: 3px;
}

.study-search-preview {
  padding: 22px;
}

.study-preview-title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 20px;
}

.study-search-preview ol {
  list-style: decimal;
  padding-left: 20px;
}

.study-search-preview li {
  margin: 10px 0;
  line-height: 1.6;
}

.study-search-preview ul {
  padding-left: 12px;
  font-size: 11px;
  list-style: none;
}

#darkMode .icon-light {
  display: none;
}

#darkMode .icon-dark,
.dark #darkMode .icon-light {
  display: inline-flex;
}

.dark #darkMode .icon-dark {
  display: none;
}

.study-site kbd {
  background: var(--learn-code);
  color: var(--learn-muted);
}

.chapter-position {
  color: var(--learn-accent);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 14px;
}

.course-chapters h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
}

.course-chapters li {
  border-bottom: 1px solid var(--learn-line);
}

.course-chapters a {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 20px;
  gap: 18px;
  align-items: baseline;
  padding: 22px 12px;
  border-radius: 6px;
}

.course-chapters a:hover {
  background: var(--learn-code);
}

.course-chapters .chapter-number {
  color: var(--learn-accent);
  font: 13px var(--study-mono);
}

.course-chapters strong {
  font-size: 18px;
  font-weight: 500;
}

.course-chapters small {
  display: block;
  color: var(--learn-muted);
  font-size: 15px;
  line-height: 1.7;
  margin-top: 8px;
}

.learning-content img[src*='/diagrams/'] {
  display: block;
  width: 100%;
  height: auto;
  margin: 24px 0;
  border: 1px solid var(--learn-line);
  border-radius: 8px;
  background: #fff;
}

.learning-content .concept-link {
  text-decoration-style: dotted;
  text-underline-offset: 4px;
}

.learning-content .diagram-link {
  display: block;
  margin: 24px 0;
  text-decoration: none;
}

.learning-content .diagram-link img {
  margin-bottom: 8px;
}

.diagram-link > span {
  display: block;
  text-align: right;
  font-size: 13px;
}

.concept-reference {
  white-space: normal;
}

.learning-content .concept-toggle {
  display: inline-grid;
  place-items: center;
  vertical-align: middle;
  width: 24px;
  height: 24px;
  margin: 0 2px;
  padding: 0;
  border: 1px solid var(--learn-line);
  border-radius: 50%;
  font: 12px var(--study-sans);
  color: var(--learn-accent);
  background: var(--learn-code);
}

.concept-toggle:hover,
.concept-toggle[aria-expanded='true'] {
  background: var(--learn-tint);
}

.concept-popover {
  position: fixed;
  z-index: 50;
  width: min(340px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  overflow: auto;
  padding: 16px 18px;
  color: var(--learn-text);
  background: var(--learn-surface);
  border: 1px solid var(--learn-line);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgb(15 23 42 / 16%);
  font: 15px/1.65 var(--study-sans);
}

.concept-popover[hidden] {
  display: none;
}

@media (width <= 1200px) {
  .learning-page {
    max-width: 820px;
  }
}

@media print {
  .concept-toggle,
  .concept-popover {
    display: none !important;
  }
}