:root {
  --course-bg: #07090d;
  --course-surface: #0d1117;
  --course-surface-raised: #11161e;
  --course-surface-soft: rgba(17, 22, 30, 0.82);
  --course-panel: rgba(13, 17, 23, 0.9);
  --course-control: #171d25;
  --course-control-active: #202731;
  --course-control-hover: #151b23;
  --course-header: rgba(7, 9, 13, 0.96);
  --course-page-overlay: rgba(7, 9, 13, 0.9);
  --course-reader-overlay: rgba(7, 9, 13, 0.95);
  --course-reader-text: #dce2e8;
  --course-code-bg: #080b10;
  --course-code-text: #dce7ef;
  --course-quote-bg: #111820;
  --course-quote-text: #c2cbd4;
  --course-line: #26303b;
  --course-line-strong: #3a4653;
  --course-text: #f2f5f8;
  --course-muted: #9faab6;
  --course-subtle: #707b87;
  --course-cyan: #40e0d0;
  --course-blue: #69a7ff;
  --course-green: #75d69c;
  --course-purple: #b58cff;
  --course-orange: #ffad66;
  --course-red: #ff7d86;
  --course-focus: #7ff7eb;
  --course-radius: 8px;
  --course-header-height: 64px;
  --course-shell: 1440px;
  --course-reader: 1500px;
  --course-font: Inter, Manrope, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --course-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

html[data-theme="light"] {
  --course-bg: #f4f7f8;
  --course-surface: #ffffff;
  --course-surface-raised: #edf2f4;
  --course-surface-soft: #f8fafb;
  --course-panel: #ffffff;
  --course-control: #edf2f4;
  --course-control-active: #dfe8eb;
  --course-control-hover: #e7eef0;
  --course-header: rgba(255, 255, 255, 0.97);
  --course-page-overlay: rgba(244, 247, 248, 0.91);
  --course-reader-overlay: rgba(244, 247, 248, 0.94);
  --course-reader-text: #243139;
  --course-code-bg: #182027;
  --course-code-text: #edf4f7;
  --course-quote-bg: #edf4f5;
  --course-quote-text: #405159;
  --course-line: #cbd6da;
  --course-line-strong: #92a5ad;
  --course-text: #172126;
  --course-muted: #52636b;
  --course-subtle: #71828a;
  --course-cyan: #007d82;
  --course-blue: #1266a8;
  --course-green: #28794e;
  --course-purple: #6846a5;
  --course-orange: #a44e12;
  --course-red: #b12f3d;
  --course-focus: #006b70;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--course-bg);
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

html[data-theme="light"] {
  color-scheme: light;
}

body.courses-body {
  background-color: var(--course-bg);
  background-image: url('/images/digitable-learning-atlas.jpg');
  background-position: center top;
  background-repeat: no-repeat;
  background-size: cover;
  color: var(--course-text);
  font-family: var(--course-font);
  font-size: 16px;
  letter-spacing: 0;
  margin: 0;
  min-height: 100vh;
}

body.courses-body::before {
  background: var(--course-page-overlay);
  content: '';
  inset: 0;
  pointer-events: none;
  position: fixed;
  z-index: -1;
}

html[data-theme="light"] body.courses-body {
  background-image: none;
}

html.theme-is-transitioning,
html.theme-is-transitioning body,
html.theme-is-transitioning body::before,
html.theme-is-transitioning body * {
  transition-duration: 240ms !important;
  transition-property: background-color, border-color, box-shadow, color, fill, opacity, stroke !important;
  transition-timing-function: ease !important;
}

body.search-open,
body.reader-panel-open,
body.reader-dialog-open {
  overflow: hidden;
}

[hidden] {
  display: none !important;
}

a {
  color: var(--course-blue);
}

button,
input {
  font: inherit;
  letter-spacing: 0;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--course-focus) !important;
  outline-offset: 3px;
}

.sr-only {
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  background: var(--course-text);
  color: var(--course-bg);
  left: 12px;
  padding: 10px 14px;
  position: fixed;
  top: -80px;
  z-index: 200;
}

.skip-link:focus {
  top: 12px;
}

.course-icon {
  display: block;
  flex: 0 0 auto;
}

.portal-shell {
  margin: 0 auto;
  max-width: var(--course-shell);
  padding-left: 20px;
  padding-right: 20px;
  width: 100%;
}

.portal-main {
  min-height: calc(100vh - var(--course-header-height));
  padding: 24px 0 40px;
}

.portal-main--home {
  padding-bottom: 18px;
  padding-top: 18px;
}

.portal-header {
  background: var(--course-header);
  border-bottom: 1px solid var(--course-line);
  min-height: var(--course-header-height);
  position: sticky;
  top: 0;
  z-index: 90;
}

.portal-header__inner {
  align-items: center;
  display: grid;
  gap: 24px;
  grid-template-columns: 200px minmax(0, 1fr) auto;
  min-height: calc(var(--course-header-height) - 1px);
}

.portal-brand {
  align-items: center;
  color: var(--course-text);
  display: inline-flex;
  gap: 10px;
  min-width: 0;
  text-decoration: none;
}

.portal-brand:hover {
  color: var(--course-text);
  text-decoration: none;
}

.portal-brand img {
  background: #fff;
  border-radius: 7px;
  height: 36px;
  object-fit: contain;
  padding: 3px;
  width: 36px;
}

.portal-brand span {
  display: grid;
  line-height: 1.05;
}

.portal-brand strong {
  font-size: 14px;
  font-weight: 700;
}

.portal-brand small {
  color: var(--course-muted);
  font-size: 12px;
  margin-top: 3px;
}

.portal-nav {
  align-items: center;
  display: flex;
  gap: 4px;
  justify-content: center;
}

.portal-nav__link {
  align-items: center;
  border-bottom: 2px solid transparent;
  color: var(--course-muted);
  display: inline-flex;
  font-size: 13px;
  font-weight: 600;
  gap: 7px;
  min-height: 42px;
  padding: 0 12px;
  text-decoration: none;
  white-space: nowrap;
}

.portal-nav__link:hover {
  color: var(--course-text);
  text-decoration: none;
}

.portal-nav__link.is-active {
  border-bottom-color: var(--course-cyan);
  color: var(--course-text);
}

.portal-nav__link small {
  background: var(--course-control-active);
  border-radius: 999px;
  color: var(--course-muted);
  font-family: var(--course-mono);
  font-size: 10px;
  line-height: 1;
  padding: 4px 6px;
}

.portal-header__actions {
  align-items: center;
  display: flex;
  gap: 6px;
}

.portal-icon-button,
.reader-header__back,
.reader-header__brand {
  align-items: center;
  background: transparent;
  border: 1px solid var(--course-line);
  border-radius: 8px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  height: 40px;
  justify-content: center;
  padding: 0;
  text-decoration: none;
  width: 40px;
}

.portal-icon-button:hover,
.reader-header__back:hover,
.reader-header__brand:hover {
  border-color: var(--course-line-strong);
  color: var(--course-text);
  text-decoration: none;
}

.portal-menu-trigger {
  display: none;
}

[data-theme-icon] {
  display: none;
}

html[data-theme="dark"] [data-theme-icon="light"],
html[data-theme="light"] [data-theme-icon="dark"] {
  display: inline-flex;
}

.section-heading {
  align-items: end;
  display: flex;
  gap: 24px;
  justify-content: space-between;
}

.section-heading--compact {
  align-items: center;
}

.section-kicker {
  color: var(--course-cyan);
  display: block;
  font-family: var(--course-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  margin-bottom: 7px;
  text-transform: uppercase;
}

.section-heading h1,
.section-heading h2,
.about-intro h1 {
  color: var(--course-text);
  font-family: var(--course-font);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.12;
  margin: 0;
}

.section-heading h2 {
  font-size: 20px;
}

.section-heading p {
  color: var(--course-muted);
  line-height: 1.5;
  margin: 7px 0 0;
  max-width: 680px;
}

.text-link {
  align-items: center;
  color: var(--course-muted);
  display: inline-flex;
  font-size: 13px;
  font-weight: 600;
  gap: 7px;
  text-decoration: none;
  white-space: nowrap;
}

.text-link:hover {
  color: var(--course-text);
  text-decoration: none;
}

/* Overview */
.home-workspace {
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(0, 1.6fr) minmax(320px, 0.72fr);
  min-height: calc(100svh - var(--course-header-height) - 38px);
}

.home-paths,
.home-now {
  min-width: 0;
}

.home-paths {
  display: grid;
  gap: 18px;
  grid-template-rows: auto minmax(0, 1fr);
}

.home-now {
  border-left: 1px solid var(--course-line);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-left: 28px;
}

.track-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(140px, 1fr));
}

.track-card {
  --track-accent: var(--course-cyan);
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-text);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-rows: auto auto 1fr;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  padding: 16px;
  position: relative;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, background-color 160ms ease;
}

.track-card:hover {
  background: var(--course-surface-raised);
  border-color: var(--track-accent);
  color: var(--course-text);
  text-decoration: none;
  transform: translateY(-2px);
}

.track-card--blue { --track-accent: var(--course-blue); }
.track-card--green { --track-accent: var(--course-green); }
.track-card--purple { --track-accent: var(--course-purple); }
.track-card--orange { --track-accent: var(--course-orange); }
.track-card--red { --track-accent: var(--course-red); }

.track-card[data-track="playbook"] {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--course-cyan) 10%, transparent), transparent 60%),
    var(--course-panel);
  border-color: color-mix(in srgb, var(--course-cyan) 42%, var(--course-line));
  grid-column: 1 / -1;
  min-height: 104px;
}

.track-card__icon {
  color: var(--track-accent);
  grid-column: 1;
  grid-row: 1;
}

.track-card__number {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 11px;
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
}

.track-card strong {
  align-self: end;
  font-size: 16px;
  grid-column: 1 / 3;
  grid-row: 2;
  line-height: 1.25;
  margin-top: 18px;
}

.track-card small {
  color: var(--course-muted);
  font-size: 12px;
  grid-column: 1 / 3;
  grid-row: 3;
  line-height: 1.45;
  margin-top: 7px;
  min-width: 0;
  overflow-wrap: anywhere;
}

.track-card__arrow {
  align-self: end;
  color: var(--track-accent);
  grid-column: 3;
  grid-row: 2 / 4;
  justify-self: end;
}

.continue-card,
.latest-card,
.quick-routes {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
}

.continue-card {
  color: var(--course-text);
  display: grid;
  gap: 5px;
  grid-template-columns: 1fr auto;
  padding: 14px;
  text-decoration: none;
}

.continue-card:hover,
.latest-card:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
  text-decoration: none;
}

.continue-card__label,
.latest-card__label {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 10px;
  text-transform: uppercase;
}

.continue-card strong {
  font-size: 13px;
  grid-column: 1;
  line-height: 1.4;
}

.continue-card__meta {
  color: var(--course-muted);
  font-size: 11px;
}

.continue-card__arrow {
  align-self: center;
  grid-column: 2;
  grid-row: 1 / 4;
}

.latest-card {
  color: var(--course-text);
  display: grid;
  flex: 1;
  grid-template-columns: minmax(96px, 0.38fr) minmax(0, 1fr);
  min-height: 180px;
  overflow: hidden;
  text-decoration: none;
}

.latest-card__visual {
  align-items: center;
  background: var(--course-surface-raised);
  border-right: 1px solid var(--course-line);
  color: var(--course-purple);
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
  padding: 14px;
  text-align: center;
}

.latest-card__visual small {
  color: var(--course-muted);
  font-size: 10px;
  line-height: 1.3;
}

.latest-card__body {
  align-content: center;
  display: grid;
  gap: 10px;
  padding: 18px;
}

.latest-card__body strong {
  font-size: 15px;
  line-height: 1.4;
}

.latest-card__body > small {
  color: var(--course-muted);
  font-size: 11px;
}

.quick-routes {
  padding: 14px;
}

.quick-routes__title {
  color: var(--course-muted);
  display: block;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.quick-routes > div {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.quick-routes a,
.article-tags a,
.video-detail__tags a {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  font-family: var(--course-mono);
  font-size: 10px;
  line-height: 1;
  padding: 7px 9px;
  text-decoration: none;
}

.quick-routes a:hover,
.article-tags a:hover,
.video-detail__tags a:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
  text-decoration: none;
}

/* Search */
.portal-search {
  inset: 0;
  position: fixed;
  z-index: 180;
}

.portal-search__backdrop {
  background: rgba(0, 0, 0, 0.72);
  border: 0;
  inset: 0;
  position: absolute;
  width: 100%;
}

.portal-search__panel {
  background: var(--course-surface);
  border: 1px solid var(--course-line-strong);
  border-radius: var(--course-radius);
  left: 50%;
  max-height: min(680px, calc(100vh - 64px));
  max-width: 720px;
  overflow: hidden;
  position: absolute;
  top: 32px;
  transform: translateX(-50%);
  width: calc(100% - 32px);
}

.portal-search__header {
  align-items: center;
  border-bottom: 1px solid var(--course-line);
  display: grid;
  gap: 12px;
  grid-template-columns: auto 1fr auto;
  padding: 12px;
}

.portal-search__header > svg {
  color: var(--course-muted);
  margin-left: 4px;
}

.portal-search__header input {
  background: transparent;
  border: 0;
  color: var(--course-text);
  font-size: 17px;
  min-width: 0;
  outline: 0;
  padding: 10px 0;
  width: 100%;
}

.portal-search__status {
  color: var(--course-subtle);
  font-size: 11px;
  padding: 10px 16px 6px;
  text-transform: uppercase;
}

.portal-search__results {
  max-height: 560px;
  overflow-y: auto;
  padding: 8px;
}

.portal-search__result {
  border-radius: 6px;
  color: var(--course-text);
  display: grid;
  gap: 3px 12px;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  padding: 12px;
  text-decoration: none;
}

.portal-search__result:hover {
  background: var(--course-surface-raised);
  color: var(--course-text);
  text-decoration: none;
}

.portal-search__result > span:first-child {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 10px;
  grid-row: 1 / 3;
  padding-top: 3px;
  text-transform: uppercase;
}

.portal-search__result strong {
  font-size: 14px;
  line-height: 1.35;
}

.portal-search__result small {
  color: var(--course-muted);
  font-size: 12px;
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.portal-search__result > span:last-child {
  align-self: center;
  color: var(--course-muted);
  grid-column: 3;
  grid-row: 1 / 3;
}

/* Catalogue */
.catalogue {
  display: grid;
  gap: 28px;
}

.catalogue-header {
  border-bottom: 1px solid var(--course-line);
  display: grid;
  gap: 18px;
  padding-bottom: 18px;
}

.catalogue-search {
  align-items: center;
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-muted);
  display: grid;
  gap: 8px;
  grid-template-columns: auto minmax(0, 1fr);
  min-width: 280px;
  padding: 0 11px;
}

.catalogue-search:focus-within {
  border-color: var(--course-cyan);
}

.catalogue-search input {
  background: transparent;
  border: 0;
  color: var(--course-text);
  min-height: 40px;
  min-width: 0;
  outline: 0;
  width: 100%;
}

.catalogue-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.catalogue-filters button,
.catalogue-filters a {
  align-items: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  font-size: 12px;
  font-weight: 600;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  text-decoration: none;
}

.catalogue-filters button:hover,
.catalogue-filters a:hover {
  color: var(--course-text);
}

.catalogue-filters button.is-active,
.catalogue-filters a.is-active {
  background: var(--course-control);
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

.catalogue-section {
  display: grid;
  gap: 14px;
}

.catalogue-section.is-filtered-empty {
  display: none;
}

.catalogue-section__head {
  align-items: baseline;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.catalogue-section__head h2 {
  color: var(--course-text);
  font-size: 16px;
  font-weight: 650;
  margin: 0;
}

.catalogue-section__head > span {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 11px;
}

.material-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.material-grid--featured {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.material-card {
  --material-accent: var(--course-cyan);
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  min-height: 188px;
  overflow: hidden;
}

.material-card--blue { --material-accent: var(--course-blue); }
.material-card--green { --material-accent: var(--course-green); }
.material-card--purple { --material-accent: var(--course-purple); }
.material-card--orange { --material-accent: var(--course-orange); }
.material-card--red { --material-accent: var(--course-red); }

.material-card:hover {
  border-color: var(--material-accent);
}

.material-card__visual {
  align-items: flex-start;
  background: var(--course-surface-raised);
  border-right: 1px solid var(--course-line);
  color: var(--material-accent);
  display: flex;
  justify-content: center;
  padding-top: 18px;
}

.material-card__content {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 15px 16px 13px;
}

.material-card__topline {
  align-items: center;
  color: var(--course-subtle);
  display: flex;
  font-family: var(--course-mono);
  font-size: 10px;
  gap: 8px;
  justify-content: space-between;
  min-height: 18px;
  text-transform: uppercase;
}

.material-card__recommended {
  color: var(--material-accent);
}

.material-card h2 {
  font-size: 15px;
  line-height: 1.35;
  margin: 8px 0 0;
}

.material-card h2 a {
  color: var(--course-text);
  text-decoration: none;
}

.material-card h2 a:hover {
  color: var(--material-accent);
  text-decoration: none;
}

.material-card p {
  color: var(--course-muted);
  display: -webkit-box;
  font-size: 12px;
  line-height: 1.5;
  margin: 8px 0 10px;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.material-card__tags,
.video-card__tags {
  display: flex;
  gap: 7px;
  min-width: 0;
  overflow: hidden;
}

.material-card__tags span,
.video-card__tags span {
  color: var(--course-subtle);
  flex: 0 1 auto;
  font-family: var(--course-mono);
  font-size: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.material-card__meta {
  align-items: center;
  border-top: 1px solid var(--course-line);
  color: var(--course-subtle);
  display: flex;
  flex-wrap: wrap;
  font-size: 10px;
  gap: 8px 12px;
  margin-top: auto;
  padding-top: 10px;
}

.material-card__meta span {
  align-items: center;
  display: inline-flex;
  gap: 5px;
}

.catalogue-empty {
  border: 1px dashed var(--course-line-strong);
  border-radius: var(--course-radius);
  color: var(--course-muted);
  margin: 0;
  padding: 24px;
  text-align: center;
}

.catalogue-pagination {
  align-items: center;
  border-top: 1px solid var(--course-line);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  padding-top: 18px;
}

.catalogue-pagination a {
  align-items: center;
  color: var(--course-muted);
  display: inline-flex;
  font-size: 12px;
  gap: 7px;
  text-decoration: none;
}

.catalogue-pagination a:last-child {
  justify-self: end;
}

.catalogue-pagination > span:nth-child(2) {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 11px;
}

/* Topics */
.topics-page {
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  gap: 30px;
  padding: 24px;
}

.topics-page__header {
  border-bottom: 1px solid var(--course-line);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  padding-bottom: 20px;
}

.topics-page__tools {
  align-items: end;
  display: grid;
  gap: 8px;
  justify-items: end;
}

.topics-view-switch {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: inline-grid;
  grid-auto-flow: column;
  padding: 3px;
}

.topics-view-switch button {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 6px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  font-size: 12px;
  font-weight: 700;
  gap: 7px;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
}

.topics-view-switch button[aria-selected='true'] {
  background: var(--course-surface);
  box-shadow: 0 0 0 1px var(--course-line);
  color: var(--course-text);
}

.topics-list-view {
  display: grid;
  gap: 30px;
}

.topics-featured,
.topics-all {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  gap: 14px;
  padding: 18px;
}

.topic-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topic-cloud a {
  align-items: center;
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-text);
  display: inline-flex;
  gap: 9px;
  min-height: 38px;
  padding: 7px 10px;
  text-decoration: none;
}

.topic-cloud a:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
  text-decoration: none;
}

.topic-cloud strong {
  font-family: var(--course-mono);
  font-size: 11px;
  font-weight: 500;
}

.topic-cloud span {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 10px;
}

.topic-cloud--popular a {
  background: var(--course-control);
  border-color: var(--course-line-strong);
}

.topics-graph {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  gap: 16px;
  padding: 18px;
}

.topics-graph__header {
  align-items: start;
  display: flex;
  gap: 24px;
  justify-content: space-between;
}

.topics-graph__header h2 {
  font-size: 22px;
  line-height: 1.25;
  margin: 3px 0 0;
}

.topics-graph__header p {
  color: var(--course-muted);
  line-height: 1.5;
  margin: 7px 0 0;
  max-width: 720px;
}

.topics-graph__controls {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: inline-flex;
  flex: 0 0 auto;
  padding: 3px;
}

.topics-graph__controls button {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 6px;
  color: var(--course-text);
  cursor: pointer;
  display: inline-flex;
  font-family: var(--course-mono);
  font-size: 13px;
  height: 34px;
  justify-content: center;
  min-width: 34px;
  padding: 0 9px;
}

.topics-graph__controls button:hover {
  background: var(--course-control-active);
}

.topics-graph__controls button:disabled {
  color: var(--course-subtle);
  cursor: default;
  opacity: 0.55;
}

.topics-graph__canvas {
  background-color: var(--course-surface);
  background-image: radial-gradient(var(--course-line) 0.7px, transparent 0.7px);
  background-size: 20px 20px;
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  min-height: 600px;
  overflow: hidden;
}

.topics-graph__canvas svg {
  display: block;
  height: 600px;
  min-width: 920px;
  width: 100%;
}

.topic-graph__edge {
  stroke: var(--course-line-strong);
  stroke-width: 1.2;
  transition: opacity 150ms ease, stroke 150ms ease;
  vector-effect: non-scaling-stroke;
}

.topic-graph__edge--bridge {
  opacity: 0.55;
  stroke-dasharray: 5 7;
}

.topic-graph__edge--trunk {
  opacity: 0.48;
  stroke: var(--course-cyan);
}

.topic-graph__edge--tag {
  opacity: 0.5;
}

.topic-graph__cluster-node,
.topic-graph__tag-node {
  cursor: pointer;
  opacity: 1;
  transition: opacity 150ms ease;
}

.topic-graph__cluster-node rect,
.topic-graph__tag-node rect {
  fill: var(--course-surface-raised);
  stroke: var(--graph-accent);
  stroke-width: 1.3;
  transition: fill 150ms ease, stroke-width 150ms ease;
  vector-effect: non-scaling-stroke;
}

.topic-graph__cluster-node text,
.topic-graph__tag-node text,
.topic-graph__core text {
  fill: var(--course-text);
  font-family: var(--course-font);
  pointer-events: none;
}

.topic-graph__cluster-node text {
  font-size: 14px;
  font-weight: 750;
}

.topic-graph__cluster-node:hover rect,
.topic-graph__cluster-node:focus-visible rect,
.topic-graph__cluster-node.is-active rect {
  fill: var(--course-control-active);
  stroke-width: 2.5;
}

.topic-graph__tag-node rect {
  fill: var(--course-surface);
}

.topic-graph__tag-node:hover rect,
.topic-graph__tag-node:focus-visible rect {
  fill: var(--course-control-hover);
  stroke-width: 2.2;
}

.topic-graph__tag-label {
  font-family: var(--course-mono) !important;
  font-size: 10px;
}

.topic-graph__tag-count {
  fill: var(--graph-accent) !important;
  font-family: var(--course-mono) !important;
  font-size: 9px;
  font-weight: 700;
}

.topic-graph__core circle {
  fill: var(--course-control);
  stroke: var(--course-cyan);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.topic-graph__core text {
  font-size: 14px;
  font-weight: 800;
}

.topic-graph__core .topic-graph__core-label {
  fill: var(--course-muted);
  font-family: var(--course-mono);
  font-size: 9px;
  font-weight: 500;
}

.topic-graph__edge.is-dimmed,
.topic-graph__cluster-node.is-dimmed,
.topic-graph__tag-node.is-dimmed {
  opacity: 0.12;
}

.topic-graph__tag-node.is-filtered-out {
  opacity: 0.06;
  pointer-events: none;
}

.topics-graph__inspector {
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
  padding: 16px;
}

.topics-graph__inspector-label {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
}

.topics-graph__inspector h3 {
  font-size: 17px;
  margin: 5px 0 0;
}

.topics-graph__inspector p {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 6px 0 0;
}

.topics-graph__inspector-links {
  align-content: center;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.topics-graph__inspector-links a {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-text);
  display: inline-flex;
  font-family: var(--course-mono);
  font-size: 10px;
  gap: 9px;
  min-height: 34px;
  padding: 6px 9px;
  text-decoration: none;
}

.topics-graph__inspector-links a:hover {
  border-color: var(--course-cyan);
}

.topics-graph__inspector-links small {
  color: var(--course-subtle);
  font-size: 9px;
}

/* Video */
.video-library {
  display: grid;
  gap: 24px;
}

.video-library__toolbar {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
}

.video-channel-links {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  justify-content: flex-end;
}

.video-channel-links a,
.video-platform {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  display: inline-flex;
  font-size: 11px;
  font-weight: 600;
  gap: 6px;
  min-height: 34px;
  padding: 0 11px;
  text-decoration: none;
}

.video-channel-links a:hover,
.video-platform:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
  text-decoration: none;
}

.video-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.video-card {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: flex;
  flex-direction: column;
  min-height: 330px;
  overflow: hidden;
}

.video-card:hover {
  border-color: var(--course-purple);
}

.video-card__thumb {
  aspect-ratio: 16 / 9;
  background: #11151b;
  display: block;
  overflow: hidden;
  position: relative;
}

.video-card__thumb img,
.video-card__thumb-placeholder {
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.video-card__thumb img {
  display: block;
  transition: transform 180ms ease;
}

.video-card:hover .video-card__thumb img {
  transform: scale(1.025);
}

.video-card__thumb-placeholder {
  align-items: center;
  color: var(--course-purple);
  display: flex;
  justify-content: center;
}

.video-card__play,
.video-detail__cover-action {
  align-items: center;
  background: rgba(7, 9, 13, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  bottom: 12px;
  color: var(--course-text);
  display: flex;
  height: 42px;
  justify-content: center;
  position: absolute;
  right: 12px;
  width: 42px;
}

.video-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
}

.video-card__eyebrow {
  color: var(--course-subtle);
  display: flex;
  font-family: var(--course-mono);
  font-size: 10px;
  justify-content: space-between;
  text-transform: uppercase;
}

.video-card__eyebrow > span {
  color: var(--course-purple);
}

.video-card__title {
  font-size: 15px;
  line-height: 1.35;
  margin: 0;
}

.video-card__title a {
  color: var(--course-text);
  text-decoration: none;
}

.video-card__summary {
  color: var(--course-muted);
  display: -webkit-box;
  font-size: 12px;
  line-height: 1.5;
  margin: 0;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.video-card__footer {
  align-items: end;
  border-top: 1px solid var(--course-line);
  display: flex;
  gap: 10px;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 10px;
}

.video-card__arrow {
  color: var(--course-purple);
}

.detail-breadcrumb {
  align-items: center;
  color: var(--course-subtle);
  display: flex;
  font-size: 11px;
  gap: 7px;
  margin-bottom: 16px;
  min-width: 0;
}

.detail-breadcrumb a {
  color: var(--course-muted);
  text-decoration: none;
}

.detail-breadcrumb > span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.video-detail {
  margin: 0 auto;
  max-width: 1200px;
}

.video-detail__hero {
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.72fr);
  overflow: hidden;
}

.video-detail__cover {
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
  position: relative;
}

.video-detail__cover img {
  display: block;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.video-detail__cover-action {
  bottom: 18px;
  height: 52px;
  right: 18px;
  width: 52px;
}

.video-detail__body {
  align-content: start;
  display: grid;
  gap: 14px;
  padding: 24px;
}

.video-detail__title {
  color: var(--course-text);
  font-size: 24px;
  line-height: 1.22;
  margin: 0;
}

.video-detail__lead {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.55;
  margin: 0;
}

.video-detail__platforms,
.video-detail__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.video-platform--lg {
  min-height: 40px;
  padding: 0 14px;
}

.video-detail__description {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  margin-top: 16px;
  padding: 24px;
  white-space: normal;
}

/* About */
.about-page {
  display: grid;
  gap: 24px;
  margin: 0 auto;
  max-width: 1200px;
}

.about-intro {
  align-items: center;
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  gap: 20px 30px;
  grid-template-columns: minmax(280px, 0.9fr) minmax(300px, 1.2fr) auto;
  padding: 24px;
}

.about-intro__identity {
  align-items: center;
  display: flex;
  gap: 16px;
}

.about-intro__identity img {
  background: #fff;
  border-radius: var(--course-radius);
  height: 72px;
  object-fit: contain;
  padding: 5px;
  width: 72px;
}

.about-intro h1 {
  font-size: 24px;
}

.about-intro > p {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.6;
  margin: 0;
}

.about-stats {
  display: flex;
  gap: 10px;
  margin: 0;
}

.about-stats div {
  border-left: 1px solid var(--course-line);
  min-width: 70px;
  padding-left: 12px;
}

.about-stats dt {
  color: var(--course-text);
  font-family: var(--course-mono);
  font-size: 18px;
  font-weight: 700;
}

.about-stats dd {
  color: var(--course-subtle);
  font-size: 10px;
  margin: 4px 0 0;
}

.about-principles {
  background: var(--course-panel);
  border-bottom: 1px solid var(--course-line);
  border-top: 1px solid var(--course-line);
  display: grid;
  gap: 12px;
  padding: 18px 0;
}

.about-principles__grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, 1fr);
}

.about-principles article {
  border-top: 2px solid var(--course-line-strong);
  padding: 16px 4px 0;
}

.about-principles article > span {
  color: var(--course-cyan);
}

.about-principles h3 {
  font-size: 14px;
  margin: 11px 0 6px;
}

.about-principles p,
.about-directory header p {
  color: var(--course-muted);
  font-size: 12px;
  line-height: 1.5;
  margin: 0;
}

.about-directory {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
}

.about-directory > section {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  padding: 18px;
}

.about-directory header h2 {
  font-size: 16px;
  margin: 0 0 5px;
}

.about-directory__links > div {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 16px;
}

.about-directory__links a,
.about-directory__authors a {
  align-items: center;
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-text);
  display: flex;
  gap: 9px;
  min-height: 46px;
  padding: 8px 10px;
  text-decoration: none;
}

.about-directory__links a:hover,
.about-directory__authors a:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
  text-decoration: none;
}

.about-directory__links a > span {
  flex: 1;
  font-size: 12px;
}

.about-directory__links img {
  border-radius: 4px;
  object-fit: contain;
}

.about-directory__authors > div {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.about-directory__authors a > span {
  display: grid;
  flex: 1;
  gap: 3px;
}

.about-directory__authors img {
  border-radius: 50%;
  object-fit: cover;
}

.about-directory__authors strong {
  font-size: 12px;
}

.about-directory__authors small {
  color: var(--course-subtle);
  font-size: 10px;
}

/* Authors */
.author-directory,
.author-profile {
  margin: 0 auto;
  max-width: 1200px;
}

.author-directory > header {
  border-bottom: 1px solid var(--course-line);
  margin-bottom: 20px;
  padding-bottom: 20px;
}

.author-directory h1 {
  font-size: 30px;
  margin: 7px 0;
}

.author-directory > header p {
  color: var(--course-muted);
  margin: 0;
}

.author-directory > div {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.author-directory > div > a {
  align-items: center;
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-text);
  display: flex;
  gap: 14px;
  padding: 16px;
  text-decoration: none;
}

.author-directory > div > a:hover {
  border-color: var(--course-cyan);
  text-decoration: none;
}

.author-directory img {
  border-radius: 50%;
  object-fit: cover;
}

.author-directory a > span {
  display: grid;
  flex: 1;
  gap: 4px;
}

.author-directory small {
  color: var(--course-muted);
}

.author-breadcrumbs {
  align-items: center;
  color: var(--course-subtle);
  display: flex;
  font-size: 12px;
  gap: 8px;
  margin-bottom: 14px;
}

.author-breadcrumbs a {
  color: var(--course-muted);
}

.author-hero {
  background:
    linear-gradient(110deg, color-mix(in srgb, var(--course-cyan) 10%, transparent), transparent 44%),
    var(--course-panel);
  border: 1px solid var(--course-line-strong);
  border-radius: var(--course-radius);
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.45fr);
  padding: 28px;
}

.author-hero__main {
  align-items: center;
  display: grid;
  gap: 22px;
  grid-template-columns: 144px minmax(0, 1fr);
}

.author-hero__avatar {
  border: 1px solid var(--course-line-strong);
  border-radius: 50%;
  height: 144px;
  object-fit: cover;
  width: 144px;
}

.author-hero h1 {
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1;
  margin: 8px 0 10px;
}

.author-hero__role {
  color: var(--course-cyan);
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 12px;
}

.author-hero__lead {
  color: var(--course-muted);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
  max-width: 720px;
}

.author-hero__meta {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  font-family: var(--course-mono);
  font-size: 11px;
  gap: 8px 16px;
  margin-top: 16px;
}

.author-hero__meta span,
.author-hero__meta a {
  color: var(--course-subtle);
}

.author-facts {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
}

.author-facts div {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  min-height: 92px;
  padding: 16px;
}

.author-facts dt {
  color: var(--course-text);
  font-family: var(--course-mono);
  font-size: 22px;
  font-weight: 800;
}

.author-facts dd {
  color: var(--course-subtle);
  font-size: 11px;
  line-height: 1.35;
  margin: 7px 0 0;
}

.author-summary {
  align-items: start;
  border-bottom: 1px solid var(--course-line);
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 0.8fr) minmax(520px, 1.2fr);
  margin: 0 4px;
  padding: 24px 0;
}

.author-summary > p {
  color: var(--course-text);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  margin: 0;
}

.author-summary > div {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.author-summary article {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  display: grid;
  gap: 6px;
  min-height: 104px;
  padding: 14px;
}

.author-summary strong {
  color: var(--course-cyan);
  font-size: 11px;
  text-transform: uppercase;
}

.author-summary span {
  color: var(--course-muted);
  font-size: 11px;
  line-height: 1.5;
}

.author-profile__toolbar {
  align-items: center;
  border-bottom: 1px solid var(--course-line);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin: 0 4px;
  padding: 15px 0;
}

.author-profile__toolbar nav,
.author-profile__profiles,
.author-profile__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.author-profile__toolbar nav a,
.author-profile__profiles a {
  align-items: center;
  border-radius: 5px;
  color: var(--course-muted);
  display: inline-flex;
  font-size: 11px;
  gap: 5px;
  min-height: 32px;
  padding: 6px 9px;
  text-decoration: none;
}

.author-profile__toolbar nav a:hover,
.author-profile__profiles a:hover {
  background: var(--course-surface-raised);
  color: var(--course-text);
  text-decoration: none;
}

.author-profile__actions {
  flex: 0 1 auto;
  gap: 10px;
  justify-content: flex-end;
  min-width: 0;
}

.author-profile__profiles {
  justify-content: flex-end;
}

.author-profile__profiles a {
  border: 1px solid var(--course-line);
}

.author-resume-trigger {
  align-items: center;
  appearance: none;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 7px;
  color: var(--course-text);
  cursor: pointer;
  display: grid;
  font-family: inherit;
  gap: 9px;
  grid-template-columns: 30px minmax(0, 1fr) 18px;
  min-height: 48px;
  min-width: 202px;
  padding: 6px 8px;
  text-align: left;
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease;
}

.author-resume-trigger:hover {
  background: var(--course-control-hover);
  border-color: var(--course-line-strong);
}

.author-resume-trigger:focus-visible {
  border-color: var(--course-cyan);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--course-cyan) 18%, transparent);
  outline: 0;
}

.author-resume-trigger__icon {
  align-items: center;
  background: color-mix(in srgb, var(--course-cyan) 8%, var(--course-surface-raised));
  border: 1px solid color-mix(in srgb, var(--course-cyan) 22%, var(--course-line));
  border-radius: 5px;
  color: var(--course-cyan);
  display: inline-flex;
  height: 30px;
  justify-content: center;
  width: 30px;
}

.author-resume-trigger__copy {
  display: grid;
  gap: 1px;
  line-height: 1.25;
  min-width: 0;
}

.author-resume-trigger__copy strong {
  font-size: 12px;
  font-weight: 700;
}

.author-resume-trigger__copy > span {
  color: var(--course-muted);
  font-size: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.author-resume-trigger__chevron {
  align-items: center;
  color: var(--course-subtle);
  display: inline-flex;
  justify-content: center;
  transition: transform 160ms ease;
}

.author-resume-trigger[aria-expanded="true"] {
  background: color-mix(in srgb, var(--course-cyan) 5%, var(--course-control));
  border-color: color-mix(in srgb, var(--course-cyan) 42%, var(--course-line));
}

.author-resume-trigger[aria-expanded="true"] .author-resume-trigger__chevron {
  color: var(--course-cyan);
  transform: rotate(180deg);
}

.author-profile__intro {
  align-items: start;
  display: grid;
  gap: 12px 24px;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.6fr);
  padding: 24px 4px 6px;
}

.author-profile__intro p {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.65;
  margin: 0;
}

.author-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  grid-column: 1 / -1;
}

.author-languages span,
.author-tags span,
.author-skills span {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  font-family: var(--course-mono);
  font-size: 10px;
  padding: 6px 9px;
}

.author-impact {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: 18px 4px 0;
}

.author-impact article {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  gap: 5px;
  min-height: 152px;
  padding: 17px;
}

.author-impact strong {
  color: var(--course-text);
  font-family: var(--course-mono);
  font-size: 22px;
  line-height: 1.1;
}

.author-impact span {
  color: var(--course-cyan);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
}

.author-impact p {
  color: var(--course-subtle);
  font-size: 10px;
  line-height: 1.55;
  margin: 8px 0 0;
}

.author-section {
  border-top: 1px solid var(--course-line);
  margin-top: 28px;
  padding: 28px 4px 4px;
  scroll-margin-top: calc(var(--course-header-height) + 18px);
}

.author-section > header {
  align-items: start;
  display: grid;
  gap: 16px;
  grid-template-columns: 42px minmax(0, 1fr);
  margin-bottom: 20px;
  max-width: 820px;
}

.author-section > header > span {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 12px;
  padding-top: 6px;
}

.author-section > header h2 {
  font-size: 24px;
  margin: 0;
}

.author-section > header p {
  color: var(--course-muted);
  font-size: 12px;
  line-height: 1.55;
  margin: 6px 0 0;
}

.author-timeline {
  display: grid;
  gap: 0;
}

.author-timeline > article {
  display: grid;
  gap: 20px;
  grid-template-columns: 180px minmax(0, 1fr);
  padding: 0 0 22px;
}

.author-timeline > article:not(:last-child) > div:last-child {
  border-bottom: 1px solid var(--course-line);
  padding-bottom: 22px;
}

.author-timeline__period {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 11px;
  padding-top: 3px;
}

.author-timeline__eyebrow > span,
.author-education article > span,
.author-teaching article > span,
.author-talks a > span,
.author-writing a > span {
  color: var(--course-cyan);
  font-size: 11px;
  font-weight: 700;
}

.author-timeline__eyebrow {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.author-timeline__eyebrow small {
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 9px;
  line-height: 1;
  padding: 5px 7px;
}

.author-timeline h3,
.author-education h3,
.author-teaching h3,
.author-talks h3,
.author-publications h3,
.author-writing h3,
.author-projects h3,
.author-ecosystem h3,
.author-creative h3,
.author-skills h3,
.author-research h3 {
  font-size: 15px;
  line-height: 1.35;
  margin: 5px 0 7px;
}

.author-timeline p,
.author-education p,
.author-teaching p,
.author-talks p,
.author-projects p,
.author-ecosystem p,
.author-creative p {
  color: var(--course-muted);
  font-size: 12px;
  line-height: 1.6;
  margin: 0;
}

.author-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.author-highlights {
  color: var(--course-muted);
  display: grid;
  font-size: 12px;
  gap: 6px;
  line-height: 1.55;
  margin: 12px 0 0;
  padding-left: 18px;
}

.author-role-projects {
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  margin-top: 14px;
  overflow: clip;
}

.author-role-projects > summary {
  align-items: center;
  background: var(--course-surface-raised);
  color: var(--course-text);
  cursor: pointer;
  display: grid;
  font-size: 11px;
  font-weight: 700;
  gap: 10px;
  grid-template-columns: minmax(0, 1fr) auto auto;
  list-style: none;
  min-height: 44px;
  padding: 10px 12px;
}

.author-role-projects > summary::-webkit-details-marker {
  display: none;
}

.author-role-projects > summary small {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 9px;
  font-weight: 500;
}

.author-role-projects > summary svg {
  color: var(--course-cyan);
  transition: transform 160ms ease;
}

.author-role-projects[open] > summary svg {
  transform: rotate(180deg);
}

.author-role-projects__list {
  display: grid;
}

.author-role-projects__list > article {
  background: color-mix(in srgb, var(--course-surface-raised) 56%, transparent);
  padding: 14px;
}

.author-role-projects__list > article:not(:last-child) {
  border-bottom: 1px solid var(--course-line);
}

.author-role-projects__list h4 {
  font-size: 13px;
  line-height: 1.4;
  margin: 0 0 5px;
}

.author-role-projects__list p {
  font-size: 11px;
}

.author-role-projects__list ul {
  color: var(--course-muted);
  display: grid;
  font-size: 11px;
  gap: 5px;
  line-height: 1.55;
  margin: 10px 0 0;
  padding-left: 17px;
}

.author-education,
.author-teaching,
.author-talks,
.author-projects,
.author-ecosystem,
.author-creative,
.author-skills {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.author-education article,
.author-teaching article,
.author-talks a,
.author-projects a,
.author-ecosystem > article,
.author-creative > article,
.author-skills section {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  padding: 18px;
}

.author-education time,
.author-teaching time,
.author-talks time {
  color: var(--course-subtle);
  display: block;
  font-family: var(--course-mono);
  font-size: 10px;
  margin-bottom: 10px;
}

.author-teaching article > a {
  align-items: center;
  color: var(--course-cyan);
  display: inline-flex;
  font-size: 11px;
  gap: 5px;
  margin-top: 14px;
  text-decoration: none;
}

.author-teaching article > a:hover {
  color: var(--course-text);
}

.author-talks a,
.author-projects a {
  color: var(--course-text);
  text-decoration: none;
}

.author-talks__status {
  background: color-mix(in srgb, var(--course-cyan) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--course-cyan) 45%, var(--course-line));
  border-radius: 999px;
  color: var(--course-cyan);
  display: inline-flex;
  font-family: var(--course-mono);
  font-size: 9px;
  font-weight: 600;
  margin: 0 0 9px;
  padding: 4px 7px;
}

.author-talks a:hover,
.author-projects a:hover {
  border-color: var(--course-cyan);
  text-decoration: none;
}

.author-talks strong,
.author-projects a > span {
  align-items: center;
  color: var(--course-cyan);
  display: inline-flex;
  font-size: 11px;
  gap: 6px;
  margin-top: 14px;
}

.author-publications {
  list-style: none;
  margin: 0;
  padding: 0;
}

.author-publications li {
  border-bottom: 1px solid var(--course-line);
  display: grid;
  gap: 18px;
  grid-template-columns: 52px minmax(0, 1fr);
  padding: 15px 0;
}

.author-publications time {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 11px;
  padding-top: 3px;
}

.author-publications h3 {
  color: var(--course-text);
  margin-top: 0;
}

.author-publications a {
  text-decoration: none;
}

.author-publications a:hover h3 {
  color: var(--course-cyan);
}

.author-publications p {
  color: var(--course-muted);
  font-size: 11px;
  margin: 0 0 5px;
}

.author-publications small {
  color: var(--course-subtle);
  display: block;
  font-size: 10px;
  line-height: 1.5;
}

.author-publications__doi {
  color: var(--course-cyan);
  display: inline-block;
  font-family: var(--course-mono);
  font-size: 10px;
  margin-top: 7px;
}

.author-publications__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 9px;
}

.author-publications__actions a,
.author-publications__actions span {
  align-items: center;
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  display: inline-flex;
  font-family: var(--course-mono);
  font-size: 9px;
  gap: 5px;
  min-height: 25px;
  padding: 4px 8px;
  text-decoration: none;
}

.author-publications__actions a:hover {
  border-color: var(--course-cyan);
  color: var(--course-cyan);
  text-decoration: none;
}

.author-publications__actions .author-publications__status {
  border-style: dashed;
  color: var(--course-subtle);
}

.author-research {
  background: var(--course-panel);
  border-left: 2px solid var(--course-cyan);
  margin-top: 18px;
  padding: 18px 20px;
}

.author-research ul {
  color: var(--course-muted);
  display: grid;
  font-size: 12px;
  gap: 7px;
  line-height: 1.5;
  margin: 10px 0 0;
  padding-left: 18px;
}

.author-writing {
  border-top: 1px solid var(--course-line);
}

.author-writing a {
  align-items: center;
  color: var(--course-text);
  display: grid;
  gap: 8px 16px;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  min-height: 64px;
  padding: 10px 4px;
  text-decoration: none;
}

.author-writing a:not(:last-child) {
  border-bottom: 1px solid var(--course-line);
}

.author-writing a:hover {
  color: var(--course-cyan);
  text-decoration: none;
}

.author-writing h3 {
  margin: 0;
}

.author-projects {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.author-ecosystem {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.author-ecosystem > article,
.author-creative > article {
  display: flex;
  flex-direction: column;
}

.author-ecosystem > article > span,
.author-creative > article > span {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
}

.author-ecosystem h3 a {
  color: var(--course-text);
  text-decoration: none;
}

.author-ecosystem h3 a:hover {
  color: var(--course-cyan);
}

.author-ecosystem > article > div {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 7px 12px;
  margin-top: auto;
  padding-top: 16px;
}

.author-ecosystem > article > div a,
.author-creative > article > a,
.author-creative__links a {
  align-items: center;
  color: var(--course-cyan);
  display: inline-flex;
  font-size: 10px;
  gap: 5px;
  text-decoration: none;
}

.author-ecosystem > article > div a:hover,
.author-creative > article > a:hover,
.author-creative__links a:hover {
  color: var(--course-text);
}

.author-channels {
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 12px;
  overflow: clip;
}

.author-channels a {
  color: var(--course-text);
  display: grid;
  gap: 6px;
  min-height: 102px;
  padding: 14px;
  position: relative;
  text-decoration: none;
}

.author-channels a:not(:last-child) {
  border-right: 1px solid var(--course-line);
}

.author-channels a:hover {
  background: var(--course-surface-raised);
  color: var(--course-cyan);
  text-decoration: none;
}

.author-channels strong {
  font-size: 11px;
}

.author-channels span {
  color: var(--course-subtle);
  font-size: 9px;
  line-height: 1.45;
}

.author-channels svg {
  bottom: 13px;
  color: var(--course-cyan);
  position: absolute;
  right: 13px;
}

.author-creative {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.author-creative > article {
  background:
    linear-gradient(150deg, color-mix(in srgb, var(--course-cyan) 7%, transparent), transparent 55%),
    var(--course-panel);
  min-height: 190px;
}

.author-creative > article > a {
  margin-top: auto;
  padding-top: 16px;
}

.author-creative__links {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 7px 14px;
  margin-top: auto;
  padding-top: 16px;
}

.author-skills section > div {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

@media (max-width: 899px) {
  .author-hero {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .author-profile__toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .author-profile__actions,
  .author-profile__profiles {
    justify-content: flex-start;
  }

  .author-profile__intro {
    grid-template-columns: 1fr;
  }

  .author-summary {
    grid-template-columns: 1fr;
  }

  .author-impact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .author-ecosystem {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .author-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .author-channels a {
    border-bottom: 1px solid var(--course-line);
  }

  .author-projects {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .author-profile__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .author-resume-trigger {
    width: 100%;
  }

  .author-directory > div,
  .author-education,
  .author-teaching,
  .author-talks,
  .author-projects,
  .author-ecosystem,
  .author-creative,
  .author-skills {
    grid-template-columns: 1fr;
  }

  .author-hero__main {
    align-items: start;
    grid-template-columns: 84px minmax(0, 1fr);
  }

  .author-hero__avatar {
    height: 84px;
    width: 84px;
  }

  .author-hero h1 {
    font-size: 30px;
  }

  .author-hero__lead,
  .author-hero__meta {
    grid-column: 1 / -1;
  }

  .author-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .author-impact {
    grid-template-columns: 1fr;
  }

  .author-summary > div {
    grid-template-columns: 1fr;
  }

  .author-impact article {
    min-height: 0;
  }

  .author-channels {
    grid-template-columns: 1fr;
  }

  .author-channels a {
    border-right: 0;
  }

  .author-section > header {
    gap: 8px;
    grid-template-columns: 30px minmax(0, 1fr);
  }

  .author-section > header h2 {
    font-size: 20px;
  }

  .author-timeline > article {
    gap: 7px;
    grid-template-columns: 1fr;
  }

  .author-writing a {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .author-writing a > span {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .author-profile,
  .author-hero,
  .author-hero__main,
  .author-hero__main > div {
    min-width: 0;
  }

  .author-hero__main {
    grid-template-columns: 1fr;
  }

  .author-hero__avatar {
    height: 88px;
    width: 88px;
  }

  .author-hero h1,
  .author-hero__role,
  .author-hero__lead {
    overflow-wrap: anywhere;
  }

  .author-hero h1 {
    font-size: 28px;
  }

  .author-facts div {
    min-height: 82px;
    padding: 12px;
  }

  .author-facts dt {
    font-size: 19px;
  }
}

/* Reader */
.courses-body--reader::before {
  background: var(--course-reader-overlay);
}

.reader-header {
  background: var(--course-header);
  border-bottom: 1px solid var(--course-line);
  min-height: 58px;
  position: sticky;
  top: 0;
  z-index: 110;
}

.reader-progress {
  background: var(--course-control-active);
  bottom: -1px;
  height: 2px;
  left: 0;
  overflow: hidden;
  position: absolute;
  right: 0;
}

.reader-progress__bar {
  background: var(--course-cyan);
  display: block;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  width: 100%;
}

.reader-header__inner {
  align-items: center;
  display: grid;
  gap: 8px;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  margin: 0 auto;
  max-width: var(--course-reader);
  min-height: 58px;
  padding: 0 16px;
}

.reader-header__back,
.reader-header__brand {
  height: 36px;
  width: 36px;
}

.reader-header__brand img {
  background: #fff;
  border-radius: 5px;
  height: 28px;
  object-fit: contain;
  padding: 2px;
  width: 28px;
}

.reader-header__title {
  display: grid;
  min-width: 0;
}

.reader-header__title span {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 9px;
  text-transform: uppercase;
}

.reader-header__title strong {
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reader-header__actions {
  align-items: center;
  display: flex;
  gap: 6px;
  min-width: max-content;
}

.reader-header__progress {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 11px;
  min-width: 34px;
  text-align: right;
}

.reader-header__button {
  align-items: center;
  background: transparent;
  border: 1px solid var(--course-line);
  border-radius: 8px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  font-size: 11px;
  font-weight: 600;
  gap: 6px;
  min-height: 40px;
  min-width: 40px;
  padding: 0 10px;
}

.reader-header__button:hover {
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

.reader-header__button[aria-pressed="true"] {
  background: color-mix(in srgb, var(--course-cyan) 16%, var(--course-surface));
  border-color: var(--course-cyan);
  color: var(--course-text);
}

.reader-header__bionic {
  font-family: Georgia, serif;
  font-size: 15px;
  font-weight: 800;
}

.reader-header__button--mobile {
  display: none;
}

.reader-perspective-control,
.reader-settings-control {
  position: relative;
}

.no-js .reader-perspective-control,
.no-js .reader-settings-control {
  display: none;
}

.reader-perspective-control__segments {
  background: var(--course-control);
  border: 0;
  border-radius: 8px;
  box-shadow: inset 0 0 0 1px var(--course-line);
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-height: 40px;
  padding: 0;
}

.reader-perspective-control__segments button {
  align-items: center;
  appearance: none;
  background: transparent;
  border: 0;
  border-radius: 5px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  font-size: 11px;
  font-weight: 650;
  gap: 6px;
  justify-content: center;
  min-height: 40px;
  padding: 0 9px;
  white-space: nowrap;
}

.reader-perspective-control__segments button:hover,
.reader-perspective-control__segments button:focus-visible {
  color: var(--course-text);
}

.reader-perspective-control__segments button:focus-visible,
.reader-perspective-control__choices button:focus-visible,
.reader-header-popover__header button:focus-visible,
.reader-settings-control__options button:focus-visible {
  outline: 2px solid var(--course-cyan);
  outline-offset: 2px;
}

.reader-perspective-control__segments button[aria-checked="true"] {
  background: var(--course-surface-raised);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
  color: var(--course-text);
}

.reader-perspective-control__trigger,
.reader-settings-control {
  display: none;
}

.reader-header-popover {
  position: absolute;
  right: 0;
  top: calc(100% + 9px);
  width: min(360px, calc(100vw - 24px));
  z-index: 180;
}

.reader-header-popover__surface {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line-strong);
  border-radius: 8px;
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.34);
  color: var(--course-text);
  overflow: hidden;
}

.reader-header-popover__header {
  align-items: center;
  border-bottom: 1px solid var(--course-line);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  min-height: 58px;
  padding: 10px 12px 10px 14px;
}

.reader-header-popover__header > div {
  display: grid;
  gap: 2px;
}

.reader-header-popover__header strong {
  font-size: 13px;
}

.reader-header-popover__header span {
  color: var(--course-subtle);
  font-size: 10px;
  line-height: 1.35;
}

.reader-header-popover__header button {
  align-items: center;
  background: transparent;
  border: 1px solid var(--course-line);
  border-radius: 7px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  flex: 0 0 auto;
  height: 40px;
  justify-content: center;
  padding: 0;
  width: 40px;
}

.reader-perspective-control__choices,
.reader-settings-control__options {
  display: grid;
  gap: 8px;
  padding: 10px;
}

.reader-perspective-control__choices button,
.reader-settings-control__options button {
  align-items: center;
  appearance: none;
  background: transparent;
  border: 1px solid var(--course-line);
  border-radius: 7px;
  color: var(--course-muted);
  cursor: pointer;
  display: grid;
  gap: 10px;
  grid-template-columns: 38px minmax(0, 1fr);
  min-height: 58px;
  padding: 9px 10px;
  text-align: left;
  width: 100%;
}

.reader-perspective-control__choices button:hover,
.reader-settings-control__options button:hover {
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

.reader-perspective-control__choices button[aria-checked="true"],
.reader-settings-control__options button[aria-pressed="true"] {
  background: color-mix(in srgb, var(--course-cyan) 10%, var(--course-control));
  border-color: color-mix(in srgb, var(--course-cyan) 70%, var(--course-line));
  color: var(--course-text);
}

.reader-perspective-control__choice-icon,
.reader-settings-control__option-icon {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-cyan);
  display: inline-flex;
  height: 36px;
  justify-content: center;
  width: 36px;
}

.reader-perspective-control__choices button > span:last-child,
.reader-settings-control__options button > span:last-child {
  display: grid;
  gap: 2px;
}

.reader-perspective-control__choices strong,
.reader-settings-control__options strong {
  color: var(--course-text);
  font-size: 12px;
}

.reader-perspective-control__choices small,
.reader-settings-control__options small {
  color: var(--course-subtle);
  font-size: 10px;
  line-height: 1.35;
}

.reader-main {
  min-height: calc(100vh - 58px);
  padding: 22px 16px 48px;
}

.reader-layout {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(190px, 220px) minmax(0, 820px) minmax(190px, 220px);
  justify-content: center;
  margin: 0 auto;
  max-width: var(--course-reader);
}

.reader-layout--no-toc {
  grid-template-columns: minmax(0, 820px) minmax(190px, 220px);
}

.reader-sidebar {
  align-self: start;
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  max-height: calc(100vh - 102px);
  min-width: 0;
  position: sticky;
  top: 80px;
}

.reader-sidebar__header {
  align-items: center;
  border-bottom: 1px solid var(--course-line);
  color: var(--course-muted);
  display: flex;
  font-size: 10px;
  font-weight: 700;
  justify-content: space-between;
  min-height: 40px;
  padding: 0 12px;
  text-transform: uppercase;
}

.reader-sidebar__header > span {
  align-items: center;
  display: inline-flex;
  gap: 7px;
}

.reader-sidebar__header button {
  background: transparent;
  border: 0;
  color: var(--course-muted);
  cursor: pointer;
  display: none;
  padding: 8px;
}

.toc-sidebar__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: calc(100vh - 144px);
  overflow-y: auto;
  padding: 8px;
}

.toc-sidebar__list a {
  border-left: 2px solid transparent;
  border-radius: 0 5px 5px 0;
  color: var(--course-muted);
  display: block;
  font-size: 11px;
  line-height: 1.4;
  overflow-wrap: anywhere;
  padding: 7px 8px;
  text-decoration: none;
}

.toc-sidebar__list a[data-level="3"] { padding-left: 18px; }
.toc-sidebar__list a[data-level="4"] { padding-left: 28px; }

.toc-sidebar__list a:hover {
  background: var(--course-control-hover);
  color: var(--course-text);
  text-decoration: none;
}

.toc-sidebar__list a.is-active {
  background: var(--course-control-hover);
  border-left-color: var(--course-cyan);
  color: var(--course-text);
  font-weight: 600;
}

.reader-article {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  min-width: 0;
  overflow: hidden;
}

.article-header {
  border-bottom: 1px solid var(--course-line);
  padding: 30px 36px 24px;
}

.article-header h1 {
  color: var(--course-text);
  font-size: 30px;
  font-weight: 750;
  letter-spacing: 0;
  line-height: 1.18;
  margin: 0;
  overflow-wrap: anywhere;
}

.article-header__lead {
  color: var(--course-muted);
  font-size: 15px;
  line-height: 1.6;
  margin: 14px 0 0;
}

.article-meta {
  align-items: center;
  color: var(--course-subtle);
  display: flex;
  flex-wrap: wrap;
  font-size: 11px;
  gap: 9px 16px;
  margin-top: 17px;
}

.article-meta span {
  align-items: center;
  display: inline-flex;
  gap: 6px;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

.article-mode-button {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line-strong);
  border-radius: var(--course-radius);
  color: var(--course-text);
  cursor: pointer;
  display: inline-flex;
  font-size: 12px;
  font-weight: 600;
  gap: 8px;
  margin-top: 16px;
  min-height: 38px;
  padding: 0 12px;
}

.reader-content {
  color: var(--course-reader-text);
  font-size: 16px;
  line-height: 1.74;
  max-width: none;
  padding: 32px 36px 40px;
}

.reader-content > :first-child { margin-top: 0 !important; }
.reader-content > :last-child { margin-bottom: 0 !important; }

.reader-content h1,
.reader-content h2,
.reader-content h3,
.reader-content h4 {
  color: var(--course-text);
  font-family: var(--course-font);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.3;
  scroll-margin-top: 82px;
}

.reader-content h1 { font-size: 26px; margin: 34px 0 15px; }
.reader-content h2 { border-top: 1px solid var(--course-line); font-size: 23px; margin: 42px 0 16px; padding-top: 25px; }
.reader-content h3 { font-size: 19px; margin: 30px 0 12px; }
.reader-content h4 { font-size: 16px; margin: 24px 0 10px; }

.reader-content p,
.reader-content ul,
.reader-content ol,
.reader-content blockquote,
.reader-content table,
.reader-content pre {
  margin-bottom: 18px;
  margin-top: 0;
}

.reader-content ul,
.reader-content ol {
  padding-left: 1.5rem;
}

.reader-content li {
  margin: 0.35rem 0;
}

.reader-content li::marker {
  color: var(--course-cyan);
}

.reader-content a {
  color: var(--course-blue);
  text-decoration-color: color-mix(in srgb, var(--course-blue) 45%, transparent);
  text-underline-offset: 3px;
}

.reader-content a:hover {
  color: var(--course-cyan);
}

.reader-content blockquote {
  background: var(--course-quote-bg);
  border-left: 3px solid var(--course-purple);
  color: var(--course-quote-text);
  padding: 14px 16px;
}

.course-disclosure {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 7px;
  margin: 20px 0;
}

.course-disclosure > summary {
  align-items: center;
  color: var(--course-text);
  cursor: pointer;
  display: flex;
  font-size: 13px;
  font-weight: 700;
  gap: 12px;
  justify-content: space-between;
  list-style: none;
  min-height: 44px;
  padding: 10px 13px;
}

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

.course-disclosure > summary::after {
  color: var(--course-cyan);
  content: "+";
  flex: 0 0 auto;
  font-family: var(--course-mono);
  font-size: 18px;
  font-weight: 500;
  line-height: 1;
}

.course-disclosure[open] > summary {
  border-bottom: 1px solid var(--course-line);
}

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

.course-disclosure__body {
  color: var(--course-reader-text);
  padding: 14px 16px 16px;
}

.course-disclosure__body > :last-child {
  margin-bottom: 0;
}

.reader-perspective {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-left: 3px solid var(--course-purple);
  border-radius: 6px;
  margin: 24px 0;
  padding: 15px 16px;
}

.reader-perspective--programmer {
  background: color-mix(in srgb, var(--course-cyan) 5%, var(--course-control));
  border-left-color: var(--course-cyan);
}

.reader-perspective__header {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: 32px minmax(0, 1fr);
  margin-bottom: 9px;
}

.reader-perspective__icon {
  align-items: center;
  background: color-mix(in srgb, var(--course-purple) 14%, transparent);
  border-radius: 6px;
  color: var(--course-purple);
  display: inline-flex;
  height: 32px;
  justify-content: center;
  width: 32px;
}

.reader-perspective--programmer .reader-perspective__icon {
  background: color-mix(in srgb, var(--course-cyan) 12%, transparent);
  color: var(--course-cyan);
}

.reader-perspective__header > span:last-child {
  display: grid;
  gap: 1px;
}

.reader-perspective__header small {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
}

.reader-perspective__header strong {
  color: var(--course-text);
  font-size: 14px;
  line-height: 1.35;
}

.reader-perspective__body {
  color: var(--course-reader-text);
  font-size: 14px;
  line-height: 1.65;
}

.reader-perspective__body > :last-child {
  margin-bottom: 0;
}

.reader-edition {
  display: block;
  margin: 0;
  animation: reader-edition-enter 180ms ease-out;
}

.reader-edition[hidden] {
  display: none !important;
}

.reader-edition__body > :first-child {
  margin-top: 0;
}

.reader-edition__body > :last-child {
  margin-bottom: 0;
}

.reader-edition__body > h3 {
  margin-top: 1.8rem;
}

.reader-edition__body > h4 {
  margin-top: 1.4rem;
}

@keyframes reader-edition-enter {
  from {
    opacity: 0;
    transform: translateY(4px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .reader-edition {
    animation: none;
  }
}

.reader-content pre,
.reader-content .highlight {
  background: var(--course-code-bg) !important;
  border: 1px solid var(--course-line);
  border-radius: 6px;
  max-width: 100%;
  overflow-x: auto;
}

.reader-content pre {
  color: var(--course-code-text);
  padding: 16px;
  white-space: pre;
}

.reader-content pre code {
  background: transparent;
  display: block;
  font-family: var(--course-mono);
  font-size: 13px;
  line-height: 1.65;
  overflow-wrap: normal;
  tab-size: 4;
  white-space: pre;
  word-break: normal;
}

.reader-content :not(pre) > code {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 4px;
  color: var(--course-orange);
  font-family: var(--course-mono);
  font-size: 0.88em;
  padding: 0.12em 0.35em;
}

.reader-content img,
.reader-content video {
  border-radius: 6px;
  height: auto;
  max-width: 100%;
}

.reader-content iframe {
  border: 0;
  max-width: 100%;
}

.reader-content iframe[src*="youtube"],
.reader-content iframe[src*="rutube"],
.reader-content iframe[src*="vkvideo"] {
  aspect-ratio: 16 / 9;
  height: auto;
  width: 100%;
}

.reader-content table {
  border-collapse: collapse;
  display: block;
  max-width: 100%;
  overflow-x: auto;
}

.reader-content th,
.reader-content td {
  border: 1px solid var(--course-line);
  padding: 9px 11px;
  text-align: left;
}

.reader-content th {
  background: var(--course-control-hover);
  color: var(--course-text);
}

.reader-content :target {
  background: transparent !important;
  box-shadow: none !important;
  color: inherit;
  outline: 0 !important;
}

.bionic-reader-enabled .reader-content {
  line-height: 1.82;
}

.bionic-word__lead {
  color: var(--course-text);
  font-weight: 750;
}

.mermaid {
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  margin: 22px 0;
  overflow: hidden;
  padding: 0 !important;
}

.mermaid-toolbar {
  align-items: center;
  background: var(--course-surface-raised);
  border-bottom: 1px solid var(--course-line);
  display: flex;
  gap: 4px;
  justify-content: flex-end;
  min-height: 38px;
  padding: 5px 7px;
}

.mermaid-toolbar button {
  background: transparent;
  border: 1px solid var(--course-line);
  border-radius: 5px;
  color: var(--course-muted);
  cursor: pointer;
  font-family: var(--course-mono);
  font-size: 11px;
  height: 28px;
  min-width: 30px;
}

.mermaid-toolbar button:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
}

.mermaid-viewport {
  max-height: 70vh;
  min-height: 220px;
  overflow: auto;
  padding: 18px;
}

.mermaid-viewport svg {
  display: block;
  height: auto;
  max-width: none !important;
  transition: transform 120ms ease;
}

.post-nav {
  border-top: 1px solid var(--course-line);
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
  margin: 0 36px;
  padding: 22px 0 30px;
}

.post-nav__link {
  background: var(--course-surface-raised);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-text);
  display: grid;
  gap: 5px;
  min-height: 86px;
  padding: 13px;
  text-decoration: none;
}

.post-nav__link:hover {
  border-color: var(--course-cyan);
  color: var(--course-text);
  text-decoration: none;
}

.post-nav__link--next {
  text-align: right;
}

.post-nav__link span {
  color: var(--course-subtle);
  font-size: 10px;
  text-transform: uppercase;
}

.post-nav__link strong {
  font-size: 12px;
  line-height: 1.4;
}

.comments-section {
  min-height: 180px;
  padding: 4px 8px 10px;
}

.comments-prompt {
  display: grid;
  gap: 12px;
  padding: 12px 4px;
}

.comments-prompt p {
  color: var(--course-muted);
  font-size: 11px;
  line-height: 1.5;
  margin: 0;
}

.comments-prompt button {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-text);
  cursor: pointer;
  display: inline-flex;
  font-size: 11px;
  font-weight: 600;
  gap: 7px;
  justify-content: center;
  min-height: 36px;
  padding: 0 10px;
}

.comments-prompt button:hover {
  border-color: var(--course-cyan);
}

.giscus-frame,
.giscus-frame iframe,
.comments-section .giscus {
  border: 0;
  max-width: 100%;
  width: 100%;
}

.giscus-frame iframe {
  min-height: 260px;
}

html[data-theme="dark"] .giscus-frame iframe { color-scheme: dark; }
html[data-theme="light"] .giscus-frame iframe { color-scheme: light; }

.reader-sidebar__empty {
  color: var(--course-muted);
  font-size: 12px;
  padding: 14px;
}

.reader-panel-backdrop {
  display: none;
}

@media (max-width: 1349px) {
  .portal-header__inner {
    grid-template-columns: 160px minmax(0, 1fr) auto;
  }

  .portal-nav__link {
    padding: 0 8px;
  }

  .portal-nav__link small {
    display: none;
  }
}

@media (max-width: 1199px) {
  .portal-header__inner {
    grid-template-columns: 160px minmax(0, 1fr) auto;
  }

  .portal-nav__link {
    padding: 0 8px;
  }

  .portal-nav__link small {
    display: none;
  }

  .material-grid--featured {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .reader-layout {
    display: block;
    max-width: 860px;
  }

  .reader-header__button--mobile {
    display: inline-flex;
  }

  .reader-perspective-control__segments {
    display: none;
  }

  .reader-perspective-control__trigger {
    display: inline-flex;
  }

  .reader-sidebar {
    bottom: 0;
    border-radius: 0;
    display: block;
    left: auto;
    max-height: 100vh;
    max-width: 360px;
    position: fixed;
    right: 0;
    top: 0;
    transform: translateX(105%);
    transition: transform 180ms ease;
    width: min(88vw, 360px);
    z-index: 150;
  }

  .reader-sidebar.is-open {
    transform: translateX(0);
  }

  .reader-sidebar__header {
    min-height: 54px;
  }

  .reader-sidebar__header button {
    display: inline-flex;
  }

  .toc-sidebar__list {
    max-height: calc(100vh - 54px);
  }

  .reader-panel-backdrop:not([hidden]) {
    background: rgba(0, 0, 0, 0.72);
    border: 0;
    display: block;
    inset: 0;
    position: fixed;
    width: 100%;
    z-index: 140;
  }
}

@media (max-width: 899px) {
  .portal-shell {
    padding-left: 14px;
    padding-right: 14px;
  }

  .portal-main {
    padding-bottom: 28px;
    padding-top: 18px;
  }

  .portal-header {
    position: relative;
  }

  .portal-header__inner {
    gap: 10px;
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .portal-nav {
    background: var(--course-surface);
    border: 1px solid var(--course-line-strong);
    border-radius: var(--course-radius);
    display: none;
    flex-direction: column;
    left: 14px;
    padding: 6px;
    position: absolute;
    right: 14px;
    top: calc(100% + 6px);
    z-index: 100;
  }

  .portal-nav.is-open {
    display: flex;
  }

  .portal-nav__link {
    border-bottom: 0;
    border-radius: 6px;
    justify-content: flex-start;
    min-height: 44px;
    padding: 0 12px;
    width: 100%;
  }

  .portal-nav__link.is-active {
    background: var(--course-control);
  }

  .portal-nav__link small {
    display: inline-flex;
    margin-left: auto;
  }

  .portal-menu-trigger {
    display: inline-flex;
  }

  .section-heading,
  .video-library__toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .courses-page__header-actions {
    align-items: flex-start;
  }

  .catalogue-search {
    min-width: 0;
    width: 100%;
  }

  .home-workspace {
    display: block;
    min-height: auto;
  }

  .home-paths {
    gap: 14px;
  }

  .home-now {
    border-left: 0;
    border-top: 1px solid var(--course-line);
    margin-top: 24px;
    padding-left: 0;
    padding-top: 22px;
  }

  .track-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
  }

  .track-card {
    min-height: 150px;
  }

  .latest-card {
    min-height: 180px;
  }

  .material-grid,
  .material-grid--featured,
  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .video-library__toolbar {
    align-items: flex-start;
  }

  .video-channel-links {
    justify-content: flex-start;
  }

  .video-detail__hero,
  .about-intro,
  .about-directory {
    grid-template-columns: 1fr;
  }

  .about-principles__grid {
    grid-template-columns: 1fr;
  }

  .about-directory__links > div {
    grid-template-columns: repeat(2, 1fr);
  }

  .reader-header {
    position: relative;
  }

  .reader-header__inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .reader-header__brand {
    display: none;
  }

  .reader-header__progress,
  .reader-header__button-label {
    display: none;
  }

  .reader-header__button {
    height: 40px;
    justify-content: center;
    padding: 0;
    width: 40px;
  }

  .reader-perspective-control__trigger {
    padding: 0 9px;
    width: auto;
  }

  .reader-main {
    padding: 12px 10px 32px;
  }

  .article-header {
    padding: 24px 22px 20px;
  }

  .article-header h1 {
    font-size: 26px;
  }

  .reader-content {
    padding: 26px 22px 34px;
  }

  .topics-page {
    gap: 20px;
    padding: 18px;
  }

  .topics-page__header,
  .topics-graph__header {
    align-items: stretch;
    flex-direction: column;
  }

  .topics-page__tools {
    justify-items: stretch;
  }

  .topics-view-switch {
    grid-template-columns: repeat(2, 1fr);
  }

  .topics-graph__canvas {
    min-height: 520px;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
  }

  .topics-graph__canvas svg {
    height: 520px;
  }

  .topics-graph__inspector {
    grid-template-columns: 1fr;
  }

  .topics-featured,
  .topics-all {
    padding: 14px;
  }

  .post-nav {
    margin: 0 22px;
  }
}

@media (max-width: 619px) {
  .section-heading h1,
  .about-intro h1 {
    font-size: 24px;
  }

  .track-grid,
  .material-grid,
  .material-grid--featured,
  .video-grid {
    grid-template-columns: 1fr;
  }

  .track-card[data-track="playbook"] {
    grid-column: auto;
  }

  .track-card {
    min-height: 132px;
  }

  .latest-card {
    grid-template-columns: 88px minmax(0, 1fr);
  }

  .material-card {
    min-height: 180px;
  }

  .catalogue-filters {
    flex-wrap: nowrap;
    margin-left: -14px;
    margin-right: -14px;
    overflow-x: auto;
    padding: 0 14px 4px;
  }

  .catalogue-filters button,
  .catalogue-filters a {
    flex: 0 0 auto;
  }

  .about-intro {
    padding: 18px;
  }

  .about-intro__identity {
    align-items: flex-start;
  }

  .about-stats {
    justify-content: space-between;
  }

  .about-directory__links > div {
    grid-template-columns: 1fr;
  }

  .reader-header__inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
    padding-left: 10px;
    padding-right: 10px;
  }

  .reader-header__brand,
  .reader-header__desktop-setting {
    display: none;
  }

  .reader-header__actions {
    gap: 4px;
  }

  .reader-settings-control {
    display: block;
  }

  .reader-header-popover {
    align-items: flex-end;
    background: rgba(0, 0, 0, 0.68);
    display: flex;
    inset: 0;
    padding: 12px;
    position: fixed;
    width: auto;
  }

  .reader-header-popover__surface {
    max-height: min(82vh, 560px);
    overflow-y: auto;
    width: 100%;
  }

  .reader-perspective-control__popover {
    left: 0;
    right: 0;
    top: 0;
  }

  .article-header {
    padding: 22px 17px 18px;
  }

  .article-header h1 {
    font-size: 23px;
  }

  .reader-content {
    font-size: 15px;
    line-height: 1.7;
    padding: 24px 17px 30px;
  }

  .reader-content h2 { font-size: 21px; }
  .reader-content h3 { font-size: 18px; }

  .topics-graph {
    padding: 12px;
  }

  .topics-graph__controls {
    align-self: flex-start;
  }

  .topics-graph__canvas {
    margin-left: -1px;
    margin-right: -1px;
  }

  .post-nav {
    grid-template-columns: 1fr;
    margin: 0 17px;
  }

  .post-nav__link--next {
    text-align: left;
  }

  .portal-search__panel {
    top: 8px;
    width: calc(100% - 16px);
  }

  .portal-search__result {
    grid-template-columns: 1fr auto;
  }

  .portal-search__result > span:first-child {
    grid-column: 1;
    grid-row: 1;
  }

  .portal-search__result strong {
    grid-column: 1 / 3;
  }

  .portal-search__result small {
    grid-column: 1 / 3;
  }
}

@media (max-width: 359px) {
  .reader-perspective-control__trigger [data-reader-perspective-current] {
    display: none;
  }

  .reader-perspective-control__trigger {
    padding: 0;
    width: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Каталог курсов: /courses/ и блок ступеней на главной
   ========================================================================== */

.section-lead {
  color: var(--course-muted);
  font-size: 14px;
  line-height: 1.55;
  margin: 6px 0 0;
  max-width: 68ch;
}

.home-courses {
  border-top: 1px solid var(--course-line);
  margin-top: 32px;
  padding-bottom: 48px;
  padding-top: 28px;
}

.stage-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 18px;
}

.stage-card {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
}

.stage-card > header {
  align-items: baseline;
  display: flex;
  gap: 10px;
}

.stage-card__number {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.stage-card h3 {
  font-size: 17px;
  margin: 0;
}

.stage-card > p {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

.stage-card__tracks {
  display: flex;
  flex-direction: column;
  gap: 6px;
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
}

.stage-card__tracks a {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--course-text);
  display: grid;
  gap: 2px 10px;
  grid-template-columns: minmax(0, 1fr) auto;
  padding: 8px 10px;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.stage-card__tracks a:hover,
.stage-card__tracks a:focus-visible {
  background: var(--course-control-hover);
  border-color: var(--course-line);
}

.stage-card__tracks strong {
  font-size: 14px;
  font-weight: 600;
}

.stage-card__tracks small {
  color: var(--course-subtle);
  font-size: 12px;
  grid-column: 1 / -1;
  line-height: 1.45;
}

.stage-card__count {
  color: var(--course-muted);
  font-family: var(--course-mono);
  font-size: 12px;
}

.stage-card__more {
  align-items: center;
  color: var(--course-cyan);
  display: inline-flex;
  font-size: 13px;
  gap: 6px;
  margin-top: auto;
  padding-top: 6px;
  text-decoration: none;
}

.stage-card__more:hover {
  text-decoration: underline;
}

/* --- страница /courses/ --- */

.courses-page {
  padding-bottom: 56px;
  padding-top: 24px;
}

.courses-page__header h1 {
  margin: 0;
}

.courses-page__header p {
  color: var(--course-muted);
  font-size: 14px;
  line-height: 1.55;
  margin: 8px 0 0;
  max-width: 78ch;
}

.courses-page__header-actions {
  align-items: flex-end;
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  gap: 10px;
}

.text-link--accent {
  color: var(--course-cyan);
}

.courses-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 28px;
}

.courses-jump a {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-text);
  display: inline-flex;
  font-size: 13px;
  gap: 7px;
  padding: 6px 14px;
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.courses-jump a:hover,
.courses-jump a:focus-visible {
  background: var(--course-control-active);
  border-color: var(--course-line-strong);
}

.courses-jump span {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 12px;
}

.courses-stage {
  border-top: 1px solid var(--course-line);
  padding: 26px 0 6px;
  scroll-margin-top: calc(var(--course-header-height) + 16px);
}

.courses-stage__head {
  display: grid;
  gap: 4px 14px;
  grid-template-columns: auto minmax(0, 1fr);
}

.courses-stage__number {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  font-size: 15px;
  padding-top: 4px;
}

.courses-stage__head h2 {
  font-size: 21px;
  margin: 0;
}

.courses-stage__head p {
  color: var(--course-muted);
  font-size: 14px;
  line-height: 1.55;
  margin: 6px 0 0;
  max-width: 82ch;
}

.courses-stage__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  margin-top: 18px;
}

.course-card {
  --track-accent: var(--course-cyan);
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-left: 3px solid var(--track-accent);
  border-radius: var(--course-radius);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
}

.course-card--blue { --track-accent: var(--course-blue); }
.course-card--green { --track-accent: var(--course-green); }
.course-card--purple { --track-accent: var(--course-purple); }
.course-card--orange { --track-accent: var(--course-orange); }
.course-card--red { --track-accent: var(--course-red); }

.course-card__head {
  display: grid;
  gap: 12px;
  grid-template-columns: auto minmax(0, 1fr);
}

.course-card__icon {
  align-items: center;
  background: var(--course-control);
  border-radius: 8px;
  color: var(--track-accent);
  display: inline-flex;
  height: 38px;
  justify-content: center;
  width: 38px;
}

.course-card__head h3 {
  font-size: 17px;
  margin: 0;
}

.course-card__head p {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 6px 0 0;
}

.course-card__meta {
  color: var(--course-subtle);
  display: flex;
  flex-wrap: wrap;
  font-size: 12.5px;
  gap: 14px;
}

.course-card__meta span {
  align-items: center;
  display: inline-flex;
  gap: 5px;
}

.course-card__list summary {
  color: var(--course-muted);
  cursor: pointer;
  font-size: 13px;
  padding: 4px 0;
}

.course-card__list summary:hover {
  color: var(--course-text);
}

.course-card__list ol {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 8px 0 0;
  padding-left: 20px;
}

.course-card__list li {
  color: var(--course-subtle);
  font-size: 13px;
  line-height: 1.45;
}

.course-card__list a {
  color: var(--course-text);
  text-decoration: none;
}

.course-card__list a:hover {
  color: var(--track-accent);
  text-decoration: underline;
}

.course-card__cta {
  align-items: center;
  align-self: flex-start;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-text);
  display: inline-flex;
  font-size: 13.5px;
  gap: 8px;
  margin-top: auto;
  padding: 8px 14px;
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.course-card__cta:hover,
.course-card__cta:focus-visible {
  background: var(--course-control-active);
  border-color: var(--track-accent);
}

.course-card__empty {
  color: var(--course-subtle);
  font-size: 13px;
  margin: 0;
}

.courses-page__note {
  border-top: 1px solid var(--course-line);
  color: var(--course-muted);
  font-size: 14px;
  margin-top: 28px;
  padding-top: 20px;
}

@media (max-width: 767px) {
  .courses-page__header-actions {
    align-items: flex-start;
  }

  .courses-stage__head {
    grid-template-columns: 1fr;
  }

  .courses-stage__number {
    padding-top: 0;
  }

  .home-courses {
    padding-bottom: 32px;
  }
}

/* ==========================================================================
   Кнопка копирования кода
   ========================================================================== */

.markdown-body .highlight.has-code-toolbar,
.markdown-body pre.chroma.has-code-toolbar {
  position: relative;
}

.code-toolbar {
  align-items: center;
  display: flex;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  right: 8px;
  top: 8px;
  transition: opacity 0.15s ease;
  z-index: 2;
}

.has-code-toolbar:hover .code-toolbar,
.has-code-toolbar:focus-within .code-toolbar {
  opacity: 1;
  pointer-events: auto;
}

.code-toolbar__lang {
  color: rgba(255, 255, 255, 0.45);
  font-family: var(--course-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.code-copy {
  align-items: center;
  background: rgba(30, 38, 48, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 6px;
  color: #dbe3ea;
  cursor: pointer;
  display: inline-flex;
  font-family: inherit;
  font-size: 12px;
  gap: 6px;
  line-height: 1;
  padding: 6px 9px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.code-copy:hover {
  background: rgba(45, 55, 68, 0.96);
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}

.code-copy:focus-visible {
  outline: 2px solid var(--course-focus);
  outline-offset: 2px;
}

.code-copy[data-state="done"] {
  border-color: var(--course-green);
  color: var(--course-green);
}

.code-copy[data-state="fail"] {
  border-color: var(--course-red);
  color: var(--course-red);
}

/* На узких экранах кнопка всегда видна — hover там не работает. */
@media (hover: none), (max-width: 767px) {
  .code-toolbar {
    opacity: 1;
    pointer-events: auto;
  }

  .code-copy__label {
    display: none;
  }
}

/* ==========================================================================
   Конструктор резюме на странице автора
   ========================================================================== */

.resume-builder {
  border-top: 1px solid var(--course-line);
  margin: 32px 0;
  padding-top: 26px;
  scroll-margin-top: calc(var(--course-header-height) + 16px);
}

.resume-builder:not([hidden]) {
  animation: resume-builder-reveal 180ms ease-out;
}

.resume-builder__header {
  align-items: flex-start;
  display: flex;
  gap: 18px;
  justify-content: space-between;
}

.resume-builder__close {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  flex: 0 0 auto;
  font-family: inherit;
  font-size: 12px;
  gap: 6px;
  min-height: 34px;
  padding: 7px 10px;
}

.resume-builder__close:hover {
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

@keyframes resume-builder-reveal {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.resume-builder__grid {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  margin-top: 18px;
}

.resume-filters {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.resume-filters__block {
  background: var(--course-panel);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  margin: 0;
  padding: 14px 16px 16px;
}

.resume-filters__block legend {
  color: var(--course-muted);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 0 4px;
  text-transform: uppercase;
}

.resume-filters__hint {
  color: var(--course-subtle);
  font-size: 12px;
  line-height: 1.45;
  margin: 0 0 10px;
}

.resume-filters__sections {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.resume-toggle {
  align-items: center;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  font-size: 13.5px;
  gap: 9px;
  padding: 5px 6px;
}

.resume-toggle:hover {
  background: var(--course-control-hover);
}

.resume-toggle input {
  accent-color: var(--course-cyan);
}

.resume-filters__presets {
  border-top: 1px solid var(--course-line);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  padding-top: 10px;
}

.resume-preset {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  padding: 4px 11px;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.resume-preset:hover {
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

.resume-filters__search {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-subtle);
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  padding: 6px 10px;
}

.resume-filters__search input {
  background: none;
  border: 0;
  color: var(--course-text);
  flex: 1;
  font-family: inherit;
  font-size: 13px;
  min-width: 0;
  outline: none;
}

.resume-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  max-height: 190px;
  overflow-y: auto;
}

.resume-chip {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  padding: 4px 10px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.resume-chip:hover {
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

.resume-chip[aria-pressed="true"] {
  background: rgba(64, 224, 208, 0.14);
  border-color: var(--course-cyan);
  color: var(--course-cyan);
}

.resume-chips__empty {
  color: var(--course-subtle);
  font-size: 12.5px;
  margin: 0;
}

.resume-filters__clear {
  background: none;
  border: 0;
  color: var(--course-cyan);
  cursor: pointer;
  font-family: inherit;
  font-size: 12.5px;
  margin-top: 10px;
  padding: 0;
}

.resume-filters__field {
  display: flex;
  flex-direction: column;
  font-size: 13px;
  gap: 6px;
  margin-top: 10px;
}

.resume-filters__field--row {
  align-items: center;
  cursor: pointer;
  flex-direction: row;
  gap: 9px;
}

.resume-filters__field select {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-text);
  font-family: inherit;
  font-size: 13px;
  padding: 6px 8px;
}

.resume-filters__field input[type="checkbox"] {
  accent-color: var(--course-cyan);
}

.resume-output {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.resume-output__bar {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
}

.resume-output__stat {
  color: var(--course-muted);
  font-size: 12.5px;
  margin: 0;
}

.resume-output__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.resume-button {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-text);
  cursor: pointer;
  display: inline-flex;
  font-family: inherit;
  font-size: 13px;
  gap: 7px;
  padding: 7px 13px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.resume-button:hover {
  background: var(--course-control-active);
  border-color: var(--course-line-strong);
}

.resume-button--primary {
  border-color: var(--course-cyan);
  color: var(--course-cyan);
}

.resume-button--ghost {
  background: none;
  color: var(--course-subtle);
}

/* Предпросмотр специально выглядит как лист бумаги — то же, что уйдёт в PDF. */
.resume-preview {
  background: #ffffff;
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  max-height: 720px;
  overflow-y: auto;
  padding: 28px 32px;
}

.resume-doc {
  color: #16202a;
  font-size: 13.5px;
  line-height: 1.55;
}

.resume-doc h1 {
  color: #16202a;
  font-size: 24px;
  margin: 0 0 4px;
}

.resume-doc h2 {
  border-bottom: 1px solid #d6dee4;
  color: #35566d;
  font-size: 14px;
  letter-spacing: 0.07em;
  margin: 20px 0 10px;
  padding-bottom: 5px;
  text-transform: uppercase;
}

.resume-doc p {
  margin: 0 0 8px;
}

.resume-doc a {
  color: #14607f;
}

.resume-doc ul {
  margin: 6px 0 8px;
  padding-left: 20px;
}

.resume-doc__role {
  color: #48606f;
  font-size: 15px;
}

.resume-doc__contacts,
.resume-doc__languages,
.resume-doc__profiles {
  color: #56707f;
  font-size: 12.5px;
}

.resume-entry {
  margin-bottom: 14px;
}

.resume-entry header {
  align-items: baseline;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-bottom: 3px;
}

.resume-entry header span {
  color: #35566d;
}

.resume-entry header em {
  color: #6b8090;
  font-size: 12.5px;
  font-style: normal;
  margin-left: auto;
}

.resume-entry__projects > span {
  color: #6b8090;
  font-size: 12.5px;
}

.resume-entry__tags {
  color: #7a8b98;
  font-size: 12px;
}

@media (max-width: 900px) {
  .resume-builder__header {
    align-items: stretch;
    flex-direction: column;
  }

  .resume-builder__close {
    align-self: flex-start;
  }

  .resume-builder__grid {
    grid-template-columns: 1fr;
  }

  .resume-preview {
    max-height: 520px;
    padding: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .resume-builder:not([hidden]) {
    animation: none;
  }
}