/* =========================================================
   dotnetacademy — site design system: "Editor"
   An IDE-grade reading app: left-aligned grid, hairline
   dividers instead of shadows, one signal colour (ultramarine)
   for links and actions, one marker colour (amber) reserved for
   "you are here" states, and a dark editor surface for code in
   both themes. Grotesk for UI and headings, a serif for lesson
   prose, JetBrains Mono for anything that is data.
   Built on top of Metronic. Keep page-level styles here, not in
   per-page <style> blocks.
   ========================================================= */

/* Theme tokens. The theme is set on <html data-bs-theme="dark|light"> (see the head script in
   _Layout.cshtml and the toggle in site.js). Light follows the OS by default; code stays dark in both. */
:root,
:root[data-bs-theme="light"] {
  color-scheme: light;

  /* Surfaces: cool paper with a blue bias */
  --dna-bg: #f5f6f9;
  --dna-bg-raised: #ffffff;
  --dna-bg-sunken: #eceef3;
  --dna-glass: #ffffff;
  --dna-glass-hover: #f9fafc;
  --dna-line: #d9dce4;
  --dna-line-strong: #b7bcc9;
  --dna-card-shadow: none;
  --dna-header-bg: rgba(245, 246, 249, 0.9);
  --dna-footer-bg: #f5f6f9;
  --dna-field-bg: #ffffff;
  --dna-field-bg-focus: #ffffff;
  --dna-search-bg: #ffffff;
  --dna-chip-bg: #eceef3;
  --dna-th-bg: #f1f2f6;
  --dna-scroll: #b7bcc9;

  /* Ink */
  --dna-ink: #15181f;
  --dna-heading: #15181f;
  --dna-strong: #23272f;
  --dna-body: #3c414d;
  --dna-nav: #6f7583;
  --dna-muted: #6f7583;
  --dna-date: #6f7583;
  --dna-faint: #8d93a1;
  --dna-placeholder: #8d93a1;

  /* Signal: ultramarine for links, focus and the primary action */
  --dna-signal: #2a44d4;
  --dna-signal-ink: #ffffff;
  --dna-signal-soft: #e4e9fb;
  --dna-link: #2a44d4;
  --dna-primary: #2a44d4;
  --dna-primary-ink: #2a44d4;
  --dna-primary-ring: rgba(42, 68, 212, 0.25);
  --dna-success: #15803d;
  --dna-danger: #b91c1c;

  /* Marker: amber, only for current / progress */
  --dna-mark: #c98a0b;
  --dna-mark-soft: #fbf0d4;

  /* Editor surface (code), the same in both themes */
  --dna-editor: #0f1218;
  --dna-editor-line: #232838;
  --dna-editor-ink: #d8dce6;
  --dna-editor-muted: #8b93a7;
  --dna-code-bg: var(--dna-editor);
  --dna-code-border: var(--dna-editor-line);

  /* Inline code on the page surface */
  --dna-icode-bg: #eceef3;
  --dna-icode-border: #d9dce4;
  --dna-icode-ink: #15181f;

  /* Callouts */
  --dna-info: #2a44d4;
  --dna-warning: #b45309;
  --dna-ok: #15803d;
  --dna-bad: #b91c1c;
}

:root[data-bs-theme="dark"] {
  color-scheme: dark;

  --dna-bg: #0e1015;
  --dna-bg-raised: #15181f;
  --dna-bg-sunken: #0a0c10;
  --dna-glass: #15181f;
  --dna-glass-hover: #1a1e27;
  --dna-line: #252a35;
  --dna-line-strong: #3a4051;
  --dna-card-shadow: none;
  --dna-header-bg: rgba(14, 16, 21, 0.9);
  --dna-footer-bg: #0e1015;
  --dna-field-bg: #15181f;
  --dna-field-bg-focus: #15181f;
  --dna-search-bg: #15181f;
  --dna-chip-bg: #1e2330;
  --dna-th-bg: #1a1e27;
  --dna-scroll: #3a4051;

  --dna-ink: #eef0f5;
  --dna-heading: #eef0f5;
  --dna-strong: #dfe3ec;
  --dna-body: #b9bfcc;
  --dna-nav: #7d8494;
  --dna-muted: #7d8494;
  --dna-date: #7d8494;
  --dna-faint: #5f6677;
  --dna-placeholder: #5f6677;

  --dna-signal: #8da0ff;
  --dna-signal-ink: #0e1015;
  --dna-signal-soft: #1b2140;
  --dna-link: #8da0ff;
  --dna-primary: #8da0ff;
  --dna-primary-ink: #8da0ff;
  --dna-primary-ring: rgba(141, 160, 255, 0.3);
  --dna-success: #4ade80;
  --dna-danger: #f87171;

  --dna-mark: #e2ac3a;
  --dna-mark-soft: #2d2410;

  --dna-editor: #0a0c10;
  --dna-editor-line: #1e2330;
  --dna-editor-ink: #d8dce6;
  --dna-editor-muted: #7d8494;

  --dna-icode-bg: #1e2330;
  --dna-icode-border: #2c3242;
  --dna-icode-ink: #eef0f5;

  --dna-info: #8da0ff;
  --dna-warning: #e2ac3a;
  --dna-ok: #4ade80;
  --dna-bad: #f87171;
}

:root {
  --dna-radius: 4px;
  --dna-radius-sm: 3px;
  --dna-header-h: 56px;
  --dna-max: 1280px;

  --dna-font-ui: 'Schibsted Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --dna-font-prose: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --dna-font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, monospace;
}

/* Metronic forces html { font-size: 13px !important } (12px on phones), which shrinks every
   rem-based size on the site. html:root outranks it so rem means 16px again. */
html:root {
  font-size: 16px !important;
}

html {
  height: 100%;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  position: relative;
  min-height: 100%;
  margin: 0 !important;
  padding: 0 !important;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  font-family: var(--dna-font-ui);
  font-size: 15px;
  line-height: 1.5;
  color: var(--dna-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
#kt_body {
  background-image: none !important;
  background-color: var(--dna-bg) !important;
}

.page,
.wrapper,
.content {
  position: relative;
  z-index: 1;
  background-image: none !important;
  background-color: transparent !important;
}

button,
input,
select,
textarea,
.btn,
.form-control,
.form-select,
.menu-link {
  font-family: inherit;
}

::selection {
  background: var(--dna-signal-soft);
  color: var(--dna-ink);
}

:focus-visible {
  outline: 2px solid var(--dna-signal);
  outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--dna-font-ui);
  color: var(--dna-heading);
  letter-spacing: -0.015em;
}

.home-title,
.page-title,
.lesson-title,
.section-head h2 {
  text-wrap: balance;
}

a {
  color: var(--dna-link);
}

.tabular {
  font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------
   Metronic reconciliation
   --------------------------------------------------------- */
.text-primary,
.text-hover-primary:hover,
.text-active-primary.active {
  color: var(--dna-link) !important;
}

.text-dark,
.text-gray-800,
.text-gray-900 {
  color: var(--dna-ink) !important;
}

.text-muted,
.text-gray-600,
.text-gray-700 {
  color: var(--dna-muted) !important;
}

.bg-light-primary,
.badge-light-primary {
  background-color: var(--dna-signal-soft) !important;
  color: var(--dna-primary-ink) !important;
}

.btn {
  border-radius: var(--dna-radius);
  font-weight: 600;
}

.btn.btn-primary {
  background: var(--dna-signal);
  border: 1px solid var(--dna-signal);
  color: var(--dna-signal-ink);
  box-shadow: none;
  transition: filter 0.15s ease;
}

.btn.btn-primary:hover,
.btn.btn-primary:focus,
.btn.btn-primary:active {
  background: var(--dna-signal) !important;
  border-color: var(--dna-signal) !important;
  color: var(--dna-signal-ink) !important;
  filter: brightness(1.08);
}

.btn.btn-light {
  background-color: var(--dna-bg-raised);
  border: 1px solid var(--dna-line);
  color: var(--dna-ink);
}

.btn.btn-light:hover,
.btn.btn-light:focus {
  background-color: var(--dna-bg-raised);
  border-color: var(--dna-line-strong);
  color: var(--dna-ink);
}

.btn.btn-light-primary {
  background-color: var(--dna-signal-soft);
  border: 1px solid transparent;
  color: var(--dna-primary-ink);
}

.btn.btn-light-primary:hover,
.btn.btn-light-primary:focus {
  background-color: var(--dna-signal) !important;
  color: var(--dna-signal-ink) !important;
}

.form-control,
.form-select {
  background-color: var(--dna-field-bg);
  border: 1px solid var(--dna-line-strong);
  color: var(--dna-ink);
  border-radius: var(--dna-radius);
  font-size: 0.95rem;
}

.form-control.form-control-solid,
.form-select.form-select-solid {
  background-color: var(--dna-field-bg);
  border-color: var(--dna-line-strong);
}

.form-control::placeholder {
  color: var(--dna-placeholder);
}

.form-control:focus,
.form-select:focus,
.form-control.form-control-solid:focus,
.form-select.form-select-solid:focus {
  background-color: var(--dna-field-bg-focus);
  border-color: var(--dna-signal);
  box-shadow: 0 0 0 3px var(--dna-primary-ring);
  color: var(--dna-ink);
}

.form-label {
  font-weight: 600;
  color: var(--dna-ink);
}

.card,
.dna-card {
  background-color: var(--dna-bg-raised);
  border: 1px solid var(--dna-line) !important;
  border-radius: var(--dna-radius);
  box-shadow: none !important;
}

.scrolltop {
  background-color: var(--dna-bg-raised) !important;
  border: 1px solid var(--dna-line-strong);
  border-radius: var(--dna-radius);
}

.container-xxl {
  max-width: var(--dna-max);
}

/* ---------------------------------------------------------
   Header
   --------------------------------------------------------- */
#kt_header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--dna-header-h);
  min-height: var(--dna-header-h);
  background-color: var(--dna-header-bg) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dna-line);
  box-shadow: none !important;
}

#kt_header .container-xxl {
  height: 100%;
}

#kt_header .brand-title {
  font-family: var(--dna-font-ui);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--dna-heading) !important;
}

#kt_header .header-menu .menu {
  align-items: stretch;
}

#kt_header .menu-item {
  display: flex;
  align-items: stretch;
}

#kt_header .menu-link {
  position: relative;
  display: flex;
  align-items: center;
  padding: 0 0.75rem !important;
  background: none !important;
  border-radius: 0;
}

#kt_header .menu-title,
#kt_header .menu-link {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--dna-nav) !important;
  transition: color 0.15s ease;
}

#kt_header .menu-link:hover .menu-title,
#kt_header .menu-link:focus-visible .menu-title,
#kt_header .menu-link.active .menu-title {
  color: var(--dna-heading) !important;
}

/* Current section: an amber rule on the header's bottom edge */
#kt_header .menu-link.active::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: -1px;
  height: 2px;
  background: var(--dna-mark);
}

/* Mobile drawer menu */
@media (max-width: 991.98px) {
  .header-menu.drawer {
    background: var(--dna-bg) !important;
    border-right: 1px solid var(--dna-line);
  }

  .header-menu.drawer .menu-link {
    padding: 0.75rem 1rem !important;
  }

  .header-menu.drawer .menu-title {
    font-size: 1rem !important;
  }

  #kt_header .menu-link.active::after {
    display: none;
  }
}

/* Compact header search, styled as a command field */
.header-search {
  position: relative;
}

.header-search .form-control {
  width: 220px;
  height: 2.25rem;
  padding-left: 2.1rem;
  padding-right: 2.6rem;
  font-size: 0.8125rem;
  border-color: var(--dna-line);
  background: var(--dna-bg-raised);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, width 0.2s ease;
}

.header-search .form-control:hover {
  border-color: var(--dna-line-strong);
}

.header-search .form-control:focus {
  width: 280px;
}

.header-search .search-icon {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  font-size: 0.85rem;
  color: var(--dna-muted);
}

.header-search kbd {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  font-family: var(--dna-font-mono);
  font-size: 0.65rem;
  color: var(--dna-faint);
  background: none;
  padding: 0;
}

#kt_header_menu_toggle i,
#kt_header_menu_toggle i .path1,
#kt_header_menu_toggle i .path2 {
  color: var(--dna-nav) !important;
}

#kt_toolbar {
  display: none !important;
}

#kt_header img,
#kt_footer img {
  border-radius: 4px;
}

.header-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--dna-radius);
  background: none;
  color: var(--dna-nav);
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.header-icon-btn:hover,
.header-icon-btn:focus-visible {
  color: var(--dna-heading);
  background: var(--dna-bg-sunken);
}

.header-icon-btn .bi {
  color: inherit;
  font-size: inherit;
  line-height: 1;
}

/* Dark shows the sun (switch to light); light shows the moon (switch to dark). */
:root[data-bs-theme="dark"] .theme-icon-light,
:root[data-bs-theme="light"] .theme-icon-dark {
  display: none;
}

.header-admin {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  margin-left: 0.5rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--dna-line);
}

.header-admin .btn {
  font-size: 0.8125rem;
  padding: 0.3rem 0.65rem;
}

/* ---------------------------------------------------------
   Shared primitives
   --------------------------------------------------------- */
.eyebrow {
  display: block;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted);
}

.eyebrow-mark {
  color: var(--dna-mark);
}

.dna-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  color: var(--dna-muted);
  min-width: 0;
}

.dna-breadcrumb li {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.dna-breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--dna-faint);
}

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

.dna-breadcrumb a:hover {
  color: var(--dna-heading);
}

.dna-breadcrumb li[aria-current] span,
.dna-breadcrumb li > span {
  color: var(--dna-body);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 60vw;
}

.dna-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--dna-radius-sm);
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  line-height: 1.2;
  color: var(--dna-body);
  background-color: var(--dna-chip-bg);
  text-decoration: none;
  max-width: 100%;
}

.dna-chip-primary {
  color: var(--dna-primary-ink);
  background-color: var(--dna-signal-soft);
}

.empty-note {
  max-width: 34rem;
  padding: 2.5rem 0;
}

.empty-note h1,
.empty-note h2,
.empty-note h3 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--dna-ink);
  margin: 0 0 0.5rem;
}

.empty-note p {
  font-family: var(--dna-font-prose);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--dna-body);
  margin: 0 0 1.25rem;
}

.text-link {
  font-weight: 600;
  color: var(--dna-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
}

.text-link:hover {
  color: var(--dna-heading);
}

/* Inline code on the page surface (outside lesson content) */
.icode {
  font-family: var(--dna-font-mono);
  font-size: 0.85em;
  padding: 0.08em 0.4em;
  border-radius: var(--dna-radius-sm);
  background: var(--dna-icode-bg);
  border: 1px solid var(--dna-icode-border);
  color: var(--dna-icode-ink);
}

/* Editor pane: the dark code surface used by the hero terminal and lesson code */
.code-pane {
  background: var(--dna-editor);
  color: var(--dna-editor-ink);
  border: 1px solid var(--dna-editor-line);
  border-radius: var(--dna-radius);
  overflow: hidden;
  font-family: var(--dna-font-mono);
  font-size: 0.8125rem;
  line-height: 1.65;
}

.code-pane-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid var(--dna-editor-line);
  font-size: 0.7rem;
  color: var(--dna-editor-muted);
}

.code-pane-tab {
  padding: 0.15rem 0.5rem;
  border-radius: var(--dna-radius-sm);
  background: #1a1f2b;
  color: var(--dna-editor-ink);
}

.code-pane pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  background: none;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  tab-size: 4;
  scrollbar-width: thin;
  scrollbar-color: var(--dna-editor-line) transparent;
}

.code-pane .ln {
  display: inline-block;
  width: 2.2em;
  margin-right: 1.2em;
  text-align: right;
  color: #4d5468;
  user-select: none;
}

.code-pane .c-kw { color: #8da0ff; }
.code-pane .c-ty { color: #67d8c9; }
.code-pane .c-fn { color: #e9c46a; }
.code-pane .c-str { color: #c3e88d; }
.code-pane .c-cm { color: #5b6378; font-style: italic; }
.code-pane .c-nu { color: #f78c6c; }
.code-pane .c-pr { color: #7d8494; }

.code-pane .cursor {
  display: inline-block;
  width: 0.6em;
  height: 1.1em;
  vertical-align: -0.2em;
  background: var(--dna-editor-ink);
}

/* ---------------------------------------------------------
   Page head (category, search, about, contact)
   --------------------------------------------------------- */
.page-head {
  padding: 1.5rem 0 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--dna-line);
}

.page-title {
  font-size: clamp(1.9rem, 1.2rem + 2.8vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.02;
  color: var(--dna-heading);
  margin: 1.25rem 0 1rem;
  overflow-wrap: anywhere;
}

.page-lead {
  font-family: var(--dna-font-prose);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--dna-body);
  max-width: 60ch;
  margin: 0 0 1.5rem;
}

.page-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 0 0 1.5rem;
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  color: var(--dna-muted);
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
}

/* ---------------------------------------------------------
   Search field (home + search page)
   --------------------------------------------------------- */
.big-search {
  position: relative;
  display: flex;
  align-items: stretch;
  max-width: 36rem;
  border-radius: var(--dna-radius);
  background: var(--dna-search-bg);
  border: 1px solid var(--dna-line-strong);
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.big-search:focus-within {
  border-color: var(--dna-signal);
  box-shadow: 0 0 0 3px var(--dna-primary-ring);
}

.big-search-icon {
  flex: 0 0 auto;
  align-self: center;
  margin: 0 0 0 0.9rem;
  font-size: 1rem;
  color: var(--dna-muted);
}

.big-search .form-control {
  flex: 1 1 auto;
  min-width: 0;
  height: 2.75rem;
  padding: 0 0.75rem;
  font-size: 0.95rem;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  color: var(--dna-heading);
}

.big-search .form-control:focus {
  background: transparent;
  box-shadow: none;
}

.big-search .btn {
  flex: 0 0 auto;
  height: auto;
  padding: 0 1.25rem;
  border-radius: 0;
  font-size: 0.875rem;
}

.search-filter {
  margin-top: 1.25rem;
  max-width: 20rem;
}

/* ---------------------------------------------------------
   Home — hero
   --------------------------------------------------------- */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
  padding: 3rem 0 3.5rem;
  border-bottom: 1px solid var(--dna-line);
}

@media (min-width: 992px) {
  .home-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
    padding: 4.5rem 0 5rem;
  }
}

.home-title {
  font-size: clamp(2.4rem, 1.2rem + 5vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 0.98;
  color: var(--dna-heading);
  margin: 1rem 0 1.5rem;
}

.home-title .signal {
  color: var(--dna-signal);
}

.home-lead {
  font-family: var(--dna-font-prose);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--dna-body);
  max-width: 52ch;
  margin: 0 0 2rem;
}

.home-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 36rem;
  margin: 2.5rem 0 0;
  border-top: 1px solid var(--dna-line);
  border-bottom: 1px solid var(--dna-line);
}

.home-stats > div {
  padding: 0.75rem 1rem;
  border-left: 1px solid var(--dna-line);
}

.home-stats > div:first-child {
  padding-left: 0;
  border-left: 0;
}

.home-stats dt {
  margin: 0;
}

.home-stats dd {
  margin: 0.15rem 0 0;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--dna-heading);
  font-variant-numeric: tabular-nums;
}

.hero-aside {
  min-width: 0;
}

@media (min-width: 992px) {
  .hero-aside {
    padding-top: 1.5rem;
  }
}

.hero-aside-note {
  margin: 0.75rem 0 0;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
}

/* ---------------------------------------------------------
   Home — catalog of tracks (a bordered table of contents)
   --------------------------------------------------------- */
.catalog {
  padding: 3.5rem 0;
  scroll-margin-top: calc(var(--dna-header-h) + 1rem);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-head h2 {
  margin: 0.5rem 0 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--dna-heading);
}

.section-head p {
  margin: 0;
  max-width: 44ch;
  font-size: 0.85rem;
  color: var(--dna-muted);
}

.section-tag {
  flex: 0 0 auto;
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  color: var(--dna-muted);
}

.catalog-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--dna-line);
  border-left: 1px solid var(--dna-line);
}

@media (min-width: 640px) {
  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 992px) {
  .catalog-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.catalog-grid > li {
  min-width: 0;
  border-right: 1px solid var(--dna-line);
  border-bottom: 1px solid var(--dna-line);
}

.track {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  height: 100%;
  padding: 1.25rem;
  text-decoration: none;
  color: var(--dna-body);
  transition: background-color 0.15s ease;
}

.track:hover,
.track:focus-visible {
  background: var(--dna-bg-raised);
  color: var(--dna-body);
}

.track-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.track-icon {
  color: var(--dna-strong);
  font-size: 1.15rem;
  line-height: 1;
}

.track-icon .bi {
  color: inherit;
}

.track-count {
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.track-name {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.3;
  color: var(--dna-heading);
  overflow-wrap: anywhere;
}

.track-topics {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0.35rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--dna-muted);
}

.track-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: auto;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--dna-signal);
  opacity: 0;
  transition: opacity 0.15s ease;
}

.track:hover .track-cta,
.track:focus-visible .track-cta {
  opacity: 1;
}

/* ---------------------------------------------------------
   Home — latest lessons (a dated list)
   --------------------------------------------------------- */
.latest {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding-bottom: 1.5rem;
}

@media (min-width: 992px) {
  .latest {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }
}

.latest .section-head {
  flex-direction: column;
  align-items: flex-start;
  margin: 0;
}

.latest-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--dna-line);
}

.latest-list > li {
  border-bottom: 1px solid var(--dna-line);
}

.latest-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.25rem 1.5rem;
  align-items: baseline;
  padding: 1rem 0;
  text-decoration: none;
  color: var(--dna-ink);
}

@media (min-width: 640px) {
  .latest-row {
    grid-template-columns: 9rem minmax(0, 1fr) auto;
  }
}

.latest-cat {
  order: 2;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (min-width: 640px) {
  .latest-cat {
    order: 1;
  }
}

.latest-title {
  order: 1;
  grid-column: 1 / -1;
  min-width: 0;
  font-size: 0.97rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--dna-heading);
}

@media (min-width: 640px) {
  .latest-title {
    order: 2;
    grid-column: auto;
  }
}

.latest-row:hover .latest-title {
  text-decoration: underline;
  text-decoration-color: var(--dna-line-strong);
  text-underline-offset: 4px;
}

.latest-meta {
  order: 3;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-date);
  font-variant-numeric: tabular-nums;
}

.latest-arrow {
  color: var(--dna-faint);
  transition: color 0.15s ease;
}

.latest-row:hover .latest-arrow {
  color: var(--dna-signal);
}

/* ---------------------------------------------------------
   Category page — head, sections sidebar, numbered syllabus
   --------------------------------------------------------- */
.category-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: 1.5rem 0 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--dna-line);
}

@media (min-width: 992px) {
  .category-head {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
  }
}

.category-head-main {
  min-width: 0;
}

.category-head-main .page-title {
  margin: 1.25rem 0 1rem;
}

.category-head-main .page-lead {
  margin-bottom: 0;
}

.category-icon-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.category-icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--dna-line);
  border-radius: var(--dna-radius);
  background: var(--dna-bg-raised);
  color: var(--dna-strong);
  font-size: 1.15rem;
}

.category-icon .bi {
  color: inherit;
}

.start-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--dna-radius);
  background: var(--dna-ink);
  color: var(--dna-bg);
  text-decoration: none;
  transition: filter 0.15s ease;
}

.start-card:hover,
.start-card:focus-visible {
  color: var(--dna-bg);
  filter: brightness(1.15);
}

.start-card-eyebrow {
  display: block;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.7;
}

.start-card-title {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.start-card .bi {
  flex: 0 0 auto;
  font-size: 1.1rem;
}

.start-card-note {
  margin: 0.75rem 0 0;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
}

.category-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  margin-bottom: 4rem;
}

@media (min-width: 992px) {
  .category-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 3rem;
  }
}

.category-sidebar {
  position: sticky;
  top: calc(var(--dna-header-h) + 1.5rem);
  min-width: 0;
}

.category-sidebar-inner {
  max-height: calc(100vh - var(--dna-header-h) - 3rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--dna-scroll) transparent;
}

.topic-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.75rem;
}

.topic-link {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.2rem 0;
  color: var(--dna-body);
  font-size: 0.85rem;
  line-height: 1.35;
  text-decoration: none;
  transition: color 0.15s ease;
}

.topic-link:hover {
  color: var(--dna-heading);
}

.topic-link-num {
  flex: 0 0 auto;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
  font-variant-numeric: tabular-nums;
}

.topic-link-name {
  min-width: 0;
  overflow-wrap: anywhere;
}

.topic-link-count {
  flex-shrink: 0;
  margin-left: auto;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-faint);
}

.topic-section {
  margin-bottom: 2.5rem;
  scroll-margin-top: calc(var(--dna-header-h) + 1.25rem);
}

.topic-section:last-child {
  margin-bottom: 0;
}

.topic-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--dna-ink);
}

.topic-num {
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  color: var(--dna-muted);
  font-variant-numeric: tabular-nums;
}

.topic-head h2 {
  margin: 0;
  min-width: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--dna-heading);
  overflow-wrap: anywhere;
}

.topic-count {
  flex-shrink: 0;
  margin-left: auto;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
}

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

.lesson-list > li {
  border-bottom: 1px solid var(--dna-line);
}

.lesson-row {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0;
  text-decoration: none;
  color: var(--dna-ink);
}

.lesson-row-num {
  font-family: var(--dna-font-mono);
  font-size: 0.78rem;
  color: var(--dna-muted);
  font-variant-numeric: tabular-nums;
}

.lesson-row-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.lesson-row-title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.35;
  color: var(--dna-heading);
}

.lesson-row:hover .lesson-row-title {
  text-decoration: underline;
  text-decoration-color: var(--dna-line-strong);
  text-underline-offset: 4px;
}

.lesson-row-meta {
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
  overflow-wrap: anywhere;
}

.lesson-row-chevron {
  color: var(--dna-faint);
  transition: color 0.15s ease;
}

.lesson-row:hover .lesson-row-chevron {
  color: var(--dna-signal);
}

/* Search results */
.result-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 62rem;
  border-top: 1px solid var(--dna-line);
}

.result-list > li {
  border-bottom: 1px solid var(--dna-line);
}

.result-row {
  display: block;
  padding: 1rem 0;
  text-decoration: none;
  color: var(--dna-ink);
}

.result-title {
  display: block;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--dna-heading);
  overflow-wrap: anywhere;
}

.result-row:hover .result-title {
  text-decoration: underline;
  text-decoration-color: var(--dna-line-strong);
  text-underline-offset: 4px;
}

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.25rem;
  margin-top: 0.3rem;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
}

.results-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 1rem;
  margin-bottom: 1rem;
}

.results-head h2 {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--dna-heading);
}

.results-count {
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  color: var(--dna-muted);
}

/* ---------------------------------------------------------
   Lesson page — reading progress
   --------------------------------------------------------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 1100;
  pointer-events: none;
}

.reading-progress > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--dna-mark);
  transition: width 0.1s linear;
}

/* ---------------------------------------------------------
   Lesson page — layout grid (outline / article / on this page)
   --------------------------------------------------------- */
.lesson-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  padding-top: 1.5rem;
  margin-bottom: 4rem;
}

@media (min-width: 992px) {
  .lesson-layout {
    grid-template-columns: 15.5rem minmax(0, 1fr);
    gap: 3rem;
    padding-top: 2.5rem;
  }
}

@media (min-width: 1400px) {
  .lesson-layout {
    grid-template-columns: 15.5rem minmax(0, 1fr) 12.5rem;
    gap: 3.5rem;
  }
}

/* Lesson head (inside the article column) */
.lesson-head {
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--dna-line);
}

.lesson-position {
  margin: 1.25rem 0 0;
  font-family: var(--dna-font-mono);
  font-size: 0.75rem;
  color: var(--dna-muted);
  font-variant-numeric: tabular-nums;
}

.lesson-position .eyebrow-mark {
  color: var(--dna-mark);
}

.lesson-title {
  font-size: clamp(1.75rem, 1rem + 2.8vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.05;
  color: var(--dna-heading);
  margin: 0.75rem 0 0;
  overflow-wrap: anywhere;
}

.lesson-head-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.lesson-head-actions .btn {
  font-size: 0.8125rem;
  padding: 0.35rem 0.75rem;
}

/* Course outline (left) */
.lesson-outline {
  position: sticky;
  top: calc(var(--dna-header-h) + 1.5rem);
  min-width: 0;
}

.lesson-outline-inner {
  max-height: calc(100vh - var(--dna-header-h) - 3rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--dna-scroll) transparent;
  padding-right: 0.5rem;
}

.lesson-outline-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.lesson-outline-head > div {
  flex: 1 1 auto;
  min-width: 0;
}

.lesson-outline-eyebrow {
  display: block;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted);
  margin-bottom: 0.25rem;
}

.lesson-outline-title {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--dna-heading);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.lesson-outline-title:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.outline-close {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: var(--dna-radius);
  border: 1px solid var(--dna-line);
  background: var(--dna-bg-raised);
  color: var(--dna-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.outline-group + .outline-group {
  margin-top: 1.25rem;
}

.outline-group-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dna-strong);
}

.outline-group-name {
  min-width: 0;
  overflow-wrap: anywhere;
}

.outline-group-count {
  flex-shrink: 0;
  font-family: var(--dna-font-mono);
  font-size: 0.68rem;
  color: var(--dna-faint);
}

.outline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--dna-line);
}

.outline-list > li {
  position: relative;
}

.outline-item {
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr);
  gap: 0.25rem;
  padding: 0.3rem 0 0.3rem 0.75rem;
  color: var(--dna-muted);
  font-size: 0.8125rem;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.15s ease;
}

.outline-item:hover {
  color: var(--dna-heading);
}

.outline-item.is-current {
  color: var(--dna-heading);
  font-weight: 600;
}

/* The amber rail marks the current lesson on the outline's left edge */
.outline-item.is-current::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0.3rem;
  bottom: 0.3rem;
  width: 2px;
  background: var(--dna-mark);
}

.outline-num {
  font-family: var(--dna-font-mono);
  font-size: 0.68rem;
  color: var(--dna-faint);
  padding-top: 0.15em;
  font-variant-numeric: tabular-nums;
}

.outline-item.is-current .outline-num {
  color: var(--dna-mark);
}

.outline-label {
  min-width: 0;
  overflow-wrap: anywhere;
}

.outline-backdrop {
  display: none;
}

/* Mobile: outline becomes a slide-in drawer */
@media (max-width: 991.98px) {
  .lesson-outline {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(340px, 88vw);
    z-index: 1061;
    transform: translateX(-105%);
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0s linear 0.25s;
  }

  .lesson-outline.is-open {
    transform: none;
    visibility: visible;
    transition: transform 0.25s ease;
  }

  .lesson-outline-inner {
    height: 100%;
    max-height: none;
    background-color: var(--dna-bg);
    border-right: 1px solid var(--dna-line);
    padding: 1.25rem;
  }

  .outline-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 1060;
    background-color: rgba(8, 10, 14, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0s linear 0.25s;
  }

  .outline-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.25s ease;
  }

  body.outline-open {
    overflow: hidden;
  }
}

/* Article (centre) */
.lesson-article {
  min-width: 0;
  max-width: 52rem;
}

.lesson-cover {
  margin: 0 0 2rem;
  border-radius: var(--dna-radius);
  overflow: hidden;
  border: 1px solid var(--dna-line);
  background-color: var(--dna-bg-raised);
}

.lesson-cover img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: cover;
}

/* On this page (right) */
.lesson-toc {
  display: none;
}

.lesson-toc[hidden] {
  display: none !important;
}

@media (min-width: 1400px) {
  .lesson-toc {
    display: block;
    position: sticky;
    top: calc(var(--dna-header-h) + 1.5rem);
    min-width: 0;
  }
}

.lesson-toc-inner {
  max-height: calc(100vh - var(--dna-header-h) - 3rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--dna-scroll) transparent;
}

.lesson-toc-title {
  display: block;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted);
  margin-bottom: 0.75rem;
}

.lesson-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--dna-line);
}

.toc-link {
  display: block;
  padding: 0.25rem 0.75rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--dna-muted);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.toc-h3 .toc-link {
  padding-left: 1.5rem;
  font-size: 0.74rem;
}

.toc-link:hover {
  color: var(--dna-heading);
}

.toc-link.is-active {
  color: var(--dna-heading);
  border-left-color: var(--dna-ink);
  font-weight: 600;
}

/* ---------------------------------------------------------
   Lesson page — article typography
   Serif prose in a measured column; code, tables and figures
   use the full article width.
   --------------------------------------------------------- */
.lesson-content {
  font-family: var(--dna-font-prose);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--dna-body);
  overflow-wrap: break-word;
}

/* ~68 characters per line at any font size */
.lesson-content > :is(p, ul, ol, blockquote, .alert-box, .takeaways, h1, h2, h3, h4, h5, h6) {
  max-width: 68ch;
}

.lesson-content > :first-child {
  margin-top: 0;
}

.lesson-content h1,
.lesson-content h2,
.lesson-content h3,
.lesson-content h4,
.lesson-content h5,
.lesson-content h6 {
  position: relative;
  margin-top: 2.5rem;
  margin-bottom: 0.9rem;
  font-family: var(--dna-font-ui);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--dna-heading);
  scroll-margin-top: calc(var(--dna-header-h) + 1.5rem);
}

.lesson-content h1 { font-size: 2rem; }
.lesson-content h2 { font-size: 1.6rem; }
.lesson-content h3 { font-size: 1.2rem; }
.lesson-content h4 { font-size: 1.05rem; letter-spacing: -0.01em; }

.lesson-content .heading-anchor {
  margin-left: 0.5rem;
  font-family: var(--dna-font-mono);
  font-weight: 400;
  font-size: 0.8em;
  color: var(--dna-faint);
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}

.lesson-content h2:hover .heading-anchor,
.lesson-content h3:hover .heading-anchor,
.lesson-content .heading-anchor:focus-visible {
  opacity: 1;
}

.lesson-content .heading-anchor:hover {
  color: var(--dna-signal);
}

.lesson-content p {
  margin-bottom: 1.2rem;
}

.lesson-content strong {
  color: var(--dna-heading);
  font-weight: 600;
}

.lesson-content img {
  max-width: 100%;
  height: auto;
  margin: 1.5rem 0;
  border-radius: var(--dna-radius);
  border: 1px solid var(--dna-line);
}

.lesson-content hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--dna-line);
  opacity: 1;
}

/* Lists */
.lesson-content ul,
.lesson-content ol {
  margin: 0 0 1.2rem 0;
  padding-left: 1.4rem;
}

.lesson-content ul li,
.lesson-content ol li {
  margin-bottom: 0.4rem;
  padding-left: 0.2rem;
}

.lesson-content ul li::marker,
.lesson-content ol li::marker {
  color: var(--dna-muted);
}

/* Quill emits ordered lists for bullets, flagged via data-list */
.lesson-content ol li[data-list="bullet"] {
  list-style-type: disc;
}

/* Blockquote */
.lesson-content blockquote {
  margin: 1.75rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 2px solid var(--dna-ink);
  color: var(--dna-strong);
  font-style: italic;
}

.lesson-content blockquote p:last-child {
  margin-bottom: 0;
}

/* Opening paragraph reads as a lede */
.lesson-content > p:first-child {
  font-size: 1.08em;
  line-height: 1.65;
  color: var(--dna-strong);
}

/* Callouts: the editor's alert-box block (info, warning, success, danger) */
.lesson-content .alert-box {
  --c: var(--dna-info);
  position: relative;
  margin: 1.5rem 0;
  padding: 0.9rem 1.1rem 0.9rem 2.9rem;
  border-radius: var(--dna-radius);
  border: 1px solid var(--dna-line);
  border-left: 3px solid var(--c);
  background: var(--dna-bg-raised);
  color: var(--dna-body);
  font-family: var(--dna-font-ui);
  font-size: 0.9rem;
  line-height: 1.6;
}

.lesson-content .alert-box::before {
  content: "\f431";
  position: absolute;
  left: 1rem;
  top: 0.95rem;
  font-family: "bootstrap-icons";
  font-size: 1.05rem;
  line-height: 1;
  color: var(--c);
}

.lesson-content .alert-box.alert-warning { --c: var(--dna-warning); }
.lesson-content .alert-box.alert-warning::before { content: "\f33b"; }
.lesson-content .alert-box.alert-success { --c: var(--dna-ok); }
.lesson-content .alert-box.alert-success::before { content: "\f26b"; }
.lesson-content .alert-box.alert-danger { --c: var(--dna-bad); }
.lesson-content .alert-box.alert-danger::before { content: "\f336"; }

.lesson-content .alert-box strong {
  color: var(--dna-heading);
}

/* Numbered steps (lesson.js turns "Step 3 — Title" into a badge + title) */
.lesson-content h3.step-heading {
  padding-left: 2.75rem;
  min-height: 2rem;
}

.lesson-content .step-num {
  position: absolute;
  left: 0;
  top: -0.1em;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--dna-radius);
  background: var(--dna-ink);
  color: var(--dna-bg);
  font-family: var(--dna-font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0;
}

/* Closing summary card */
.lesson-content .takeaways {
  margin: 3rem 0 0;
  padding: 1.25rem 1.5rem 1rem;
  border-radius: var(--dna-radius);
  border: 1px solid var(--dna-line);
  border-left: 3px solid var(--dna-mark);
  background: var(--dna-bg-raised);
  font-family: var(--dna-font-ui);
  font-size: 0.95rem;
}

.lesson-content .takeaways > h2 {
  margin: 0 0 0.75rem;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-mark);
}

.lesson-content .takeaways > :last-child {
  margin-bottom: 0.25rem;
}

.lesson-content .takeaways ul li::marker {
  color: var(--dna-mark);
}

@media (max-width: 575.98px) {
  .lesson-content .takeaways {
    padding: 1rem 1.1rem 0.75rem;
  }
}

/* Inline code */
.lesson-content :not(pre) > code {
  background-color: var(--dna-icode-bg);
  border: 1px solid var(--dna-icode-border);
  color: var(--dna-icode-ink);
  padding: 0.06em 0.35em;
  margin: 0;
  letter-spacing: normal;
  border-radius: var(--dna-radius-sm);
  font-family: var(--dna-font-mono);
  font-size: 0.84em;
  font-weight: 500;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* Code blocks (Prism): an editor pane with a tab strip on top */
.lesson-content div.code-toolbar {
  position: relative;
  margin: 1.75rem 0;
  border: 1px solid var(--dna-code-border);
  border-radius: var(--dna-radius);
  background-color: var(--dna-code-bg);
  overflow: hidden;
}

.lesson-content pre[class*="language-"] {
  background-color: transparent;
  color: var(--dna-editor-ink);
  padding: 1rem 1.1rem;
  margin: 0;
  border: 0;
  border-radius: 0;
  overflow-x: auto;
  font-family: var(--dna-font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  position: relative;
  text-shadow: none;
  scrollbar-width: thin;
  scrollbar-color: var(--dna-editor-line) transparent;
}

/* Inside the toolbar wrapper the strip takes the first 2.25rem */
.lesson-content div.code-toolbar > pre[class*="language-"] {
  padding-top: 3.1rem;
}

.lesson-content pre[class*="language-"]::-webkit-scrollbar {
  height: 8px;
}

.lesson-content pre[class*="language-"]::-webkit-scrollbar-thumb {
  background: var(--dna-editor-line);
  border-radius: 4px;
}

.lesson-content pre[class*="language-"]::-webkit-scrollbar-track {
  background: transparent;
}

.lesson-content code[class*="language-"] {
  font-family: var(--dna-font-mono);
  color: var(--dna-editor-ink);
  text-shadow: none;
}

.lesson-content pre.line-numbers {
  position: relative;
  padding-left: 3.6em;
  counter-reset: linenumber;
}

.lesson-content pre.line-numbers > code {
  position: relative;
  white-space: inherit;
}

.lesson-content .line-numbers .line-numbers-rows {
  position: absolute;
  pointer-events: none;
  top: 3.1rem;
  font-size: 100%;
  left: 0;
  width: 2.8em;
  letter-spacing: -1px;
  border-right: 0;
  user-select: none;
}

.lesson-content pre.line-numbers:not(div.code-toolbar > *) .line-numbers-rows {
  top: 1rem;
}

.lesson-content .line-numbers-rows > span {
  display: block;
  counter-increment: linenumber;
}

.lesson-content .line-numbers-rows > span:before {
  content: counter(linenumber);
  color: #4d5468;
  display: block;
  padding-right: 0.6em;
  text-align: right;
}

/* Token colours (loaded after Prism's theme) */
.lesson-content .token.comment,
.lesson-content .token.prolog,
.lesson-content .token.doctype,
.lesson-content .token.cdata { color: #5b6378; font-style: italic; }
.lesson-content .token.punctuation { color: #9aa3b8; }
.lesson-content .token.keyword,
.lesson-content .token.atrule,
.lesson-content .token.selector,
.lesson-content .token.important { color: #8da0ff; }
.lesson-content .token.string,
.lesson-content .token.char,
.lesson-content .token.attr-value,
.lesson-content .token.inserted { color: #c3e88d; }
.lesson-content .token.number,
.lesson-content .token.boolean,
.lesson-content .token.constant,
.lesson-content .token.symbol { color: #f78c6c; }
.lesson-content .token.function,
.lesson-content .token.method { color: #e9c46a; }
.lesson-content .token.class-name,
.lesson-content .token.builtin,
.lesson-content .token.tag { color: #67d8c9; }
.lesson-content .token.property,
.lesson-content .token.attr-name,
.lesson-content .token.variable,
.lesson-content .token.parameter { color: #d8dce6; }
.lesson-content .token.operator,
.lesson-content .token.entity,
.lesson-content .token.url { color: #9aa3b8; background: none; }
.lesson-content .token.deleted { color: #f87171; }

/* The Prism toolbar becomes the pane's tab strip: language on the left, Copy on the right */
.lesson-content div.code-toolbar > .toolbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.6rem;
  border-bottom: 1px solid var(--dna-editor-line);
  opacity: 1;
}

.lesson-content div.code-toolbar > .toolbar > .toolbar-item {
  display: inline-flex;
}

.lesson-content div.code-toolbar > .toolbar > .toolbar-item:last-child {
  margin-left: auto;
}

.lesson-content div.code-toolbar > .toolbar > .toolbar-item > span {
  color: var(--dna-editor-ink);
  font-family: var(--dna-font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  background: #1a1f2b;
  box-shadow: none;
  padding: 0.15rem 0.5rem;
  border-radius: var(--dna-radius-sm);
}

.lesson-content div.code-toolbar > .toolbar > .toolbar-item > button {
  background: none;
  color: var(--dna-editor-muted);
  border: 0;
  padding: 0.25rem 0.5rem;
  border-radius: var(--dna-radius-sm);
  font-family: var(--dna-font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.lesson-content div.code-toolbar > .toolbar > .toolbar-item > button:hover,
.lesson-content div.code-toolbar > .toolbar > .toolbar-item > button:focus {
  background-color: #1a1f2b;
  color: var(--dna-editor-ink);
  outline: none;
}

/* Tables */
.lesson-content .table-scroll {
  margin: 1.75rem 0;
  overflow-x: auto;
  border-radius: var(--dna-radius);
  border: 1px solid var(--dna-line);
  background: var(--dna-bg-raised);
}

.lesson-content table {
  width: 100%;
  margin: 0;
  border-collapse: collapse;
  font-family: var(--dna-font-ui);
  font-size: 0.9rem;
  line-height: 1.5;
}

.lesson-content table th {
  padding: 0.7rem 1rem;
  font-weight: 600;
  color: var(--dna-heading);
  text-align: left;
  background: var(--dna-th-bg);
  border: 0;
  border-bottom: 1px solid var(--dna-line-strong);
  white-space: nowrap;
}

.lesson-content table td {
  padding: 0.7rem 1rem;
  color: var(--dna-body);
  border: 0;
  border-bottom: 1px solid var(--dna-line);
  vertical-align: top;
}

.lesson-content table tbody tr:last-child td {
  border-bottom: 0;
}

/* Links inside content */
.lesson-content a {
  color: var(--dna-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.lesson-content a:hover {
  color: var(--dna-heading);
}

/* ---------------------------------------------------------
   Lesson page — footer (share + pager)
   --------------------------------------------------------- */
.lesson-footer {
  margin-top: 3.5rem;
}

.lesson-share {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--dna-line);
}

.lesson-share-label {
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted);
}

.lesson-share-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  height: 1.9rem;
  padding: 0 0.6rem;
  border-radius: var(--dna-radius-sm);
  border: 1px solid var(--dna-line);
  background-color: var(--dna-bg-raised);
  color: var(--dna-body);
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.share-btn:hover {
  border-color: var(--dna-line-strong);
  color: var(--dna-heading);
}

.share-btn.is-copied {
  border-color: var(--dna-success);
  color: var(--dna-success);
}

.lesson-pager {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.5rem;
  border: 1px solid var(--dna-line);
  background: var(--dna-line);
}

@media (min-width: 576px) {
  .lesson-pager {
    grid-template-columns: 1fr 1fr;
  }
}

.pager-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
  padding: 1.1rem 1.25rem;
  background: var(--dna-bg);
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.pager-card:hover {
  background: var(--dna-bg-raised);
}

.pager-next {
  align-items: flex-end;
  text-align: right;
}

.pager-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted);
}

.pager-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--dna-heading);
  overflow-wrap: anywhere;
}

.pager-muted .pager-title {
  font-weight: 500;
  color: var(--dna-body);
}

/* ---------------------------------------------------------
   Prose pages (About, Contact, errors)
   --------------------------------------------------------- */
.prose-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  padding-bottom: 3rem;
}

@media (min-width: 992px) {
  .prose-page {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 4rem;
  }
}

.prose {
  font-family: var(--dna-font-prose);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--dna-body);
  max-width: 64ch;
}

.prose h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--dna-heading);
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  margin: 0 0 1.1rem;
}

.prose ul {
  padding-left: 1.3rem;
  margin: 0 0 1.1rem;
}

.prose li + li {
  margin-top: 0.35rem;
}

.prose a {
  color: var(--dna-link);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.prose strong {
  color: var(--dna-heading);
  font-weight: 600;
}

/* Facts list: label / value rows */
.fact-list {
  margin: 0;
  border-top: 1px solid var(--dna-line);
}

.fact-list > div {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--dna-line);
}

.fact-list dt {
  margin: 0;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted);
  padding-top: 0.2rem;
}

.fact-list dd {
  margin: 0;
  min-width: 0;
  font-size: 0.9rem;
  color: var(--dna-body);
  overflow-wrap: anywhere;
}

.fact-list dd a {
  color: var(--dna-link);
  text-decoration: none;
}

.fact-list dd a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Contact form */
.contact-form .form-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--dna-ink);
}

.contact-form .field {
  margin-bottom: 1.1rem;
}

.contact-form .field-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0 1rem;
}

@media (min-width: 576px) {
  .contact-form .field-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.contact-form .text-danger {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  color: var(--dna-danger) !important;
}

.form-notice {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-bottom: 1.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--dna-line);
  border-left: 3px solid var(--dna-ok);
  border-radius: var(--dna-radius);
  background: var(--dna-bg-raised);
  font-size: 0.9rem;
  color: var(--dna-body);
}

.form-notice .bi {
  color: var(--dna-ok);
  margin-top: 0.15rem;
}

/* FAQ as native disclosures */
.faq {
  border-top: 1px solid var(--dna-line);
}

.faq details {
  border-bottom: 1px solid var(--dna-line);
}

.faq summary {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.85rem 0;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dna-heading);
}

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

.faq summary::before {
  content: "+";
  flex: 0 0 1rem;
  font-family: var(--dna-font-mono);
  color: var(--dna-muted);
}

.faq details[open] summary::before {
  content: "–";
}

.faq details > p {
  margin: 0 0 1rem 1.75rem;
  font-family: var(--dna-font-prose);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--dna-body);
  max-width: 60ch;
}

/* Error pages */
.error-page {
  padding: 3rem 0 4rem;
  max-width: 40rem;
}

.error-code {
  margin: 0;
  font-family: var(--dna-font-mono);
  font-size: 0.8rem;
  color: var(--dna-mark);
}

.error-page h1 {
  margin: 0.75rem 0 1rem;
  font-size: clamp(2rem, 1.2rem + 3vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.error-page p {
  font-family: var(--dna-font-prose);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--dna-body);
  margin: 0 0 1.5rem;
}

/* ---------------------------------------------------------
   Admin
   --------------------------------------------------------- */
.admin-page-header {
  margin-bottom: 2rem;
}

.admin-page-header .admin-page-title {
  color: var(--dna-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.admin-page-header .breadcrumb {
  margin-bottom: 0;
}

.admin-stat-card .stat-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--dna-radius);
  flex-shrink: 0;
}

.admin-stat-card .stat-value {
  color: var(--dna-heading);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.1;
}

.admin-stat-card .stat-label {
  color: var(--dna-muted);
  font-weight: 600;
  font-size: 0.95rem;
}

.timeline {
  position: relative;
}

.timeline-item {
  display: flex;
  position: relative;
}

.timeline-line {
  position: absolute;
  left: 20px;
  top: 40px;
  bottom: 0;
  width: 2px;
  background-color: var(--dna-line);
}

.timeline-item:last-child .timeline-line {
  display: none;
}

.timeline-icon {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

.timeline-content {
  flex: 1;
  margin-left: 20px;
}

.stat-item {
  padding: 0.5rem;
  border-radius: var(--dna-radius);
}

.stat-item:hover {
  background-color: var(--dna-glass-hover);
}

.stat-item-total {
  padding: 1rem;
  border-radius: var(--dna-radius);
  background-color: var(--dna-glass);
  border: 1px solid var(--dna-line);
}

.sortable-item {
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.sortable-item:hover {
  background-color: var(--dna-glass-hover);
}

.sortable-ghost {
  opacity: 0.4;
  background-color: var(--dna-glass-hover);
}

.sortable-chosen {
  background-color: var(--dna-signal-soft);
}

.sortable-drag {
  opacity: 1;
}

.lesson-title-image {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 1.5rem 0;
}

.lesson-title-image img {
  max-width: 100%;
  max-height: 400px;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--dna-radius);
  border: 1px solid var(--dna-line);
}

.lesson-list-item {
  transition: background-color 0.2s ease;
}

.lesson-list-item:hover {
  background-color: var(--dna-glass-hover);
}

.lesson-list-item:last-child {
  border-bottom: none !important;
}

.lesson-list-item > .flex-grow-1 {
  min-width: 0;
}

.lesson-list-item .badge {
  white-space: normal;
  text-align: left;
  overflow-wrap: anywhere;
  max-width: 100%;
  line-height: 1.5;
}

@media (max-width: 575.98px) {
  .lesson-list-item {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .lesson-list-item > .flex-grow-1 {
    flex-basis: 100%;
  }

  .lesson-list-item > .btn {
    margin-left: 0 !important;
  }
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
#kt_footer {
  margin-top: 4rem;
  background-color: var(--dna-footer-bg);
  border-top: 1px solid var(--dna-line);
  margin-bottom: 0 !important;
  flex-shrink: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: 2.5rem 0;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  }
}

#kt_footer .footer-brand {
  font-size: 0.95rem;
  color: var(--dna-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
}

#kt_footer .footer-tagline {
  font-size: 0.85rem !important;
  font-weight: 400 !important;
  line-height: 1.55;
  color: var(--dna-muted);
  max-width: 24rem;
  margin: 0.5rem 0 0;
}

#kt_footer .footer-heading {
  margin: 0 0 0.75rem;
  font-family: var(--dna-font-mono);
  font-size: 0.6875rem !important;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dna-muted) !important;
}

#kt_footer .footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

#kt_footer .footer-links a {
  color: var(--dna-body);
  font-size: 0.85rem;
  text-decoration: none;
}

#kt_footer .footer-links a:hover {
  color: var(--dna-heading);
}

#kt_footer .footer-bottom {
  border-top: 1px solid var(--dna-line);
}

.footer-bottom-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding: 1rem 0;
  font-family: var(--dna-font-mono);
  font-size: 0.72rem;
  color: var(--dna-muted);
}

.footer-bottom-row a {
  color: var(--dna-muted);
  text-decoration: none;
}

.footer-bottom-row a:hover {
  color: var(--dna-heading);
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

/* ---------------------------------------------------------
   Layout guards (Metronic flex fixes)
   --------------------------------------------------------- */
.card-body {
  min-height: 0;
}

#kt_content_container {
  min-height: 0;
}

.content.flex-row-fluid,
.flex-lg-row-fluid {
  min-width: 0;
}

#kt_scrolltop {
  margin: 0;
  padding: 0;
}

#kt_wrapper,
.flex-root,
.page {
  margin-bottom: 0 !important;
  padding-bottom: 0 !important;
}

/* Discovery and navigation */
.skip-link {
  position: fixed;
  top: -6rem;
  left: 1rem;
  z-index: 1100;
  padding: 0.6rem 0.9rem;
  background: var(--dna-ink);
  color: var(--dna-bg);
  font-weight: 600;
  border-radius: var(--dna-radius);
}

.skip-link:focus {
  top: 0.75rem;
  color: var(--dna-bg);
}

.compact-disclosure {
  border: 1px solid var(--dna-line);
  border-radius: var(--dna-radius);
  background: var(--dna-bg-raised);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

.compact-disclosure > summary {
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--dna-ink);
}

.compact-disclosure[open] > summary {
  margin-bottom: 0.75rem;
}

.compact-disclosure .topic-link,
.mobile-toc .toc-link {
  padding-block: 0.45rem;
}

.mobile-toc[hidden] {
  display: none;
}

@media (min-width: 1400px) {
  .mobile-toc {
    display: none;
  }
}

@media (max-width: 575.98px) {
  .lesson-content {
    font-size: 1.0625rem;
  }

  .lesson-content h2 { font-size: 1.4rem; }
  .lesson-content h3 { font-size: 1.125rem; }

  #kt_header .brand-title {
    font-size: 0.95rem;
  }

  #kt_header .container-xxl {
    padding-inline: 0.75rem;
  }

  #kt_header_menu_toggle {
    margin-right: 0.35rem !important;
  }

  #kt_header img {
    height: 24px !important;
  }

  .big-search {
    flex-wrap: wrap;
  }

  .big-search .form-control {
    flex: 1 1 calc(100% - 3rem);
  }

  .big-search .btn {
    flex: 1 1 100%;
    height: 2.5rem;
    border-top: 1px solid var(--dna-line);
  }

  .lesson-cover img {
    max-height: 260px;
  }

  .topic-head {
    flex-wrap: wrap;
    gap: 0.35rem 0.75rem;
  }

  .home-stats {
    max-width: none;
  }

  .home-stats dd {
    font-size: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .track,
  .lesson-row,
  .lesson-row-chevron,
  .pager-card,
  .share-btn,
  .latest-arrow,
  .lesson-outline,
  .outline-backdrop,
  .header-icon-btn,
  .reading-progress > span {
    transition: none;
  }
}