@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600&family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,500&family=Geist+Mono:wght@400;500&family=Newsreader:opsz,wght@6..72,500;6..72,700&family=Space+Grotesk:wght@400;500;700&display=swap");

:root {
  --tt-radius-xl: 44px;
  --tt-radius-lg: 34px;
  --tt-radius-md: 24px;
  --tt-radius-sm: 999px;
  --tt-shell-height: 72px;
  --tt-font-display: "Newsreader", Georgia, serif;
  --tt-font-sans: "Space Grotesk", "Trebuchet MS", sans-serif;
}

/* ──────────────────────────────────────────────────────────────────────────
   SLP theme token fallbacks.

   When no theme is active (theme-*.css not loaded, or the page is outside
   the SLP tree), these ensure every SLP-bound token resolves to a sensible
   light default. Theme CSS files override these via `html[data-theme="..."]`
   selectors, and the existing `body[data-page]` blocks below layer
   page-specific background tints on top.
   ────────────────────────────────────────────────────────────────────────── */
:root {
  --tt-bg: #f8fbf7;
  --tt-surface: rgba(255, 255, 255, 0.92);
  --tt-surface-soft: rgba(255, 255, 255, 0.82);
  --tt-surface-strong: #ffffff;
  --tt-ink: #071018;
  --tt-muted: #1f3346;
  --tt-border: rgba(7, 16, 24, 0.18);
  --tt-border-strong: rgba(7, 16, 24, 0.32);
  --tt-accent: #0f766e;
  --tt-accent-strong: #1d4ed8;
  --tt-accent-soft: rgba(29, 78, 216, 0.1);
  --tt-button: #071018;
  --tt-button-hover: #1d4ed8;
  --tt-button-text: #ffffff;
  --tt-glow: rgba(29, 78, 216, 0.14);
  --tt-glow-alt: rgba(15, 118, 110, 0.16);
  --tt-connector: rgba(7, 16, 24, 0.14);
  --tt-shadow: 0 26px 70px rgba(7, 16, 24, 0.12);

  /* Dark-UI token namespace used by tt-landing/tt-workspace components. */
  --tt-ui-bg: #09090b;
  --tt-ui-surface: #111113;
  --tt-ui-surface-2: #18181b;
  --tt-ui-surface-3: #27272a;
  --tt-ui-border: #27272a;
  --tt-ui-border-2: #3f3f46;
  --tt-ui-text: #fafafa;
  --tt-ui-text-2: #a1a1aa;
  --tt-ui-text-3: #71717a;
  --tt-ui-accent: #34d399;
  --tt-ui-accent-glow: rgba(52, 211, 153, 0.14);
  --tt-ui-accent-soft: rgba(52, 211, 153, 0.52);
}

/* ──────────────────────────────────────────────────────────────────────────
   Theme: default (explicit named theme).

   Lives here (rather than in assets/themes/theme-default.css) because it
   IS the canonical baseline — re-asserted so that `?theme=default` behaves
   as a first-class theme choice rather than "the absence of a theme".
   Values are identical to the `:root` fallbacks above.
   ────────────────────────────────────────────────────────────────────────── */
:root[data-theme="default"] {
  --tt-font-display: "Newsreader", Georgia, serif;
  --tt-font-sans: "Space Grotesk", "Trebuchet MS", sans-serif;

  --tt-radius-xl: 44px;
  --tt-radius-lg: 34px;
  --tt-radius-md: 24px;
  --tt-radius-sm: 999px;

  --tt-bg: #f8fbf7;
  --tt-surface: rgba(255, 255, 255, 0.92);
  --tt-surface-soft: rgba(255, 255, 255, 0.82);
  --tt-surface-strong: #ffffff;
  --tt-ink: #071018;
  --tt-muted: #1f3346;
  --tt-border: rgba(7, 16, 24, 0.18);
  --tt-border-strong: rgba(7, 16, 24, 0.32);
  --tt-accent: #0f766e;
  --tt-accent-strong: #1d4ed8;
  --tt-accent-soft: rgba(29, 78, 216, 0.1);
  --tt-button: #071018;
  --tt-button-hover: #1d4ed8;
  --tt-button-text: #ffffff;
  --tt-glow: rgba(29, 78, 216, 0.14);
  --tt-glow-alt: rgba(15, 118, 110, 0.16);
  --tt-connector: rgba(7, 16, 24, 0.14);
  --tt-shadow: 0 26px 70px rgba(7, 16, 24, 0.12);

  --tt-ui-bg: #09090b;
  --tt-ui-surface: #111113;
  --tt-ui-surface-2: #18181b;
  --tt-ui-surface-3: #27272a;
  --tt-ui-border: #27272a;
  --tt-ui-border-2: #3f3f46;
  --tt-ui-text: #fafafa;
  --tt-ui-text-2: #a1a1aa;
  --tt-ui-text-3: #71717a;
  --tt-ui-accent: #34d399;
  --tt-ui-accent-glow: rgba(52, 211, 153, 0.14);
  --tt-ui-accent-soft: rgba(52, 211, 153, 0.52);
}

* {
  box-sizing: border-box;
}

body[data-page] {
  --tt-ink: #071018;
  --tt-muted: #1f3346;
  --tt-border: rgba(7, 16, 24, 0.18);
  --tt-surface: rgba(255, 255, 255, 0.92);
  --tt-surface-soft: rgba(255, 255, 255, 0.82);
  --tt-glow: rgba(29, 78, 216, 0.14);
  --tt-glow-alt: rgba(15, 118, 110, 0.16);
  --tt-connector: rgba(7, 16, 24, 0.14);
  --tt-accent: #0f766e;
  --tt-accent-strong: #1d4ed8;
  --tt-accent-soft: rgba(29, 78, 216, 0.1);
  --tt-button: #071018;
  --tt-button-hover: #1d4ed8;
  --tt-button-text: #ffffff;
  --tt-shadow: 0 26px 70px rgba(7, 16, 24, 0.12);
  margin: 0;
  min-height: 100vh;
  color: var(--tt-ink);
  font-family: var(--tt-font-sans);
  background:
    radial-gradient(circle at top left, var(--tt-glow), transparent 24%),
    radial-gradient(circle at bottom right, var(--tt-glow-alt), transparent 28%),
    linear-gradient(180deg, #f8fbf7 0%, #f2f6ff 46%, #edf7f3 100%);
  transition:
    background-color 180ms ease,
    color 180ms ease,
    background 180ms ease;
}

body[data-page="slp"],
body[data-page="slp-collection"] {
  --tt-glow: rgba(15, 118, 110, 0.14);
  --tt-glow-alt: rgba(245, 158, 11, 0.14);
}

body[data-theme="dark"] {
  --tt-ink: #f5fbff;
  --tt-muted: #d8e4ee;
  --tt-border: rgba(203, 213, 225, 0.24);
  --tt-surface: rgba(10, 21, 30, 0.94);
  --tt-surface-soft: rgba(8, 18, 26, 0.88);
  --tt-glow: rgba(34, 197, 94, 0.12);
  --tt-glow-alt: rgba(96, 165, 250, 0.12);
  --tt-connector: rgba(148, 163, 184, 0.28);
  --tt-accent: #5eead4;
  --tt-accent-strong: #93c5fd;
  --tt-accent-soft: rgba(94, 234, 212, 0.12);
  --tt-button: #ecfeff;
  --tt-button-hover: #bfdbfe;
  --tt-button-text: #051018;
  --tt-shadow: 0 30px 80px rgba(0, 0, 0, 0.34);
  background:
    radial-gradient(circle at top left, rgba(34, 197, 94, 0.12), transparent 26%),
    radial-gradient(circle at bottom right, rgba(96, 165, 250, 0.14), transparent 30%),
    linear-gradient(180deg, #071018 0%, #0a1621 46%, #0c1b22 100%);
}

body[data-page] a,
body[data-page] button {
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease,
    box-shadow 160ms ease;
}

body[data-page] a:focus-visible,
body[data-page] button:focus-visible {
  outline: 3px solid var(--tt-accent-strong);
  outline-offset: 3px;
}

.page-frame {
  position: relative;
  max-width: 1220px;
  margin: 0 auto;
  padding: 26px 20px 84px;
}

.page-frame > * {
  position: relative;
  z-index: 1;
}

.page-frame::before {
  content: "";
  position: absolute;
  left: clamp(18px, 3vw, 34px);
  top: 136px;
  bottom: 22px;
  width: 2px;
  border-radius: var(--tt-radius-sm);
  background: linear-gradient(180deg, transparent, var(--tt-connector) 10%, var(--tt-connector) 92%, transparent);
  opacity: 0.92;
  pointer-events: none;
}

.utility-bar {
  position: sticky;
  top: 14px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  padding: 12px 14px;
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius-sm);
  background: var(--tt-surface);
  box-shadow: var(--tt-shadow);
  backdrop-filter: blur(18px);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--tt-ink);
  text-decoration: none;
}

.brand-link__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 16px 22px 16px 22px;
  background: linear-gradient(135deg, var(--tt-accent-strong), var(--tt-accent));
  color: #ffffff;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-link__text {
  display: grid;
  gap: 2px;
}

.brand-link__text strong {
  font-size: 1rem;
  font-weight: 700;
}

.utility-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.utility-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius-sm);
  background: var(--tt-surface-soft);
  color: var(--tt-ink);
  font-weight: 700;
  text-decoration: none;
}

.utility-link:hover,
.utility-link.is-active {
  border-color: var(--tt-accent-strong);
  background: var(--tt-accent-soft);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 42px;
  padding: 6px 8px 6px 10px;
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius-sm);
  background: var(--tt-surface-soft);
  color: var(--tt-ink);
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--tt-accent-strong);
  transform: translateY(-1px);
}

.theme-toggle__track {
  position: relative;
  width: 52px;
  height: 28px;
  border-radius: var(--tt-radius-sm);
  background: rgba(7, 16, 24, 0.14);
  flex: 0 0 auto;
}

body[data-theme="dark"] .theme-toggle__track {
  background: rgba(236, 254, 255, 0.24);
}

.theme-toggle__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--tt-accent-strong), var(--tt-accent));
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
  transform: translateX(0);
}

.theme-toggle[aria-pressed="true"] .theme-toggle__thumb {
  transform: translateX(24px);
}

.theme-toggle__meta {
  display: grid;
  gap: 1px;
  text-align: left;
}

.theme-toggle__eyebrow {
  color: var(--tt-muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.theme-toggle__text {
  font-size: 0.9rem;
  font-weight: 700;
}

.theme-toggle__state {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 58px;
  padding: 7px 10px;
  border-radius: var(--tt-radius-sm);
  background: var(--tt-accent-soft);
  color: var(--tt-ink);
  font-size: 0.8rem;
  font-weight: 700;
}

.hero,
.surface-card,
.split-panel,
.info-card,
.archive-link {
  backdrop-filter: blur(16px);
}

.hero {
  padding: 0;
}

.hero-home {
  padding-top: 6px;
}

.hero-plate,
.surface-card,
.split-panel,
.info-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--tt-border);
  box-shadow: var(--tt-shadow);
}

.hero-plate {
  padding: 34px;
  border-radius: 36px 58px 36px 58px;
  background: linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
}

.surface-card,
.split-panel {
  border-radius: 30px 44px 30px 44px;
  background: linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
}

.info-card {
  padding: 18px;
  border-radius: 24px 34px 24px 34px;
  background: linear-gradient(180deg, var(--tt-surface-soft), var(--tt-surface));
}

.hero-plate::before,
.surface-card::before,
.split-panel::before,
.info-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.48), transparent 34%),
    radial-gradient(circle at top right, var(--tt-accent-soft), transparent 28%);
  pointer-events: none;
}

body[data-theme="dark"] .hero-plate::before,
body[data-theme="dark"] .surface-card::before,
body[data-theme="dark"] .split-panel::before,
body[data-theme="dark"] .info-card::before {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 32%),
    radial-gradient(circle at top right, rgba(147, 197, 253, 0.12), transparent 28%);
}

.hero-grid,
.hero-main,
.hero-side,
.info-stack,
.split-grid,
.card-grid,
.archive-list,
.spotlight-grid,
.activity-card,
.collection-card,
.spotlight-card {
  display: grid;
  gap: 18px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.95fr);
  align-items: start;
}

.hero-main,
.hero-side,
.surface-card > *,
.split-panel > *,
.info-card > * {
  position: relative;
  z-index: 1;
}

.eyebrow,
.section-kicker,
.panel-label {
  margin: 0;
  color: var(--tt-accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.section-kicker {
  color: var(--tt-accent-strong);
}

.panel-label {
  display: inline-block;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--tt-ink);
  font-family: var(--tt-font-display);
  line-height: 0.98;
}

h1 {
  max-width: 11ch;
  font-size: clamp(3rem, 6vw, 5.3rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  font-weight: 700;
}

h3 {
  font-size: 1.75rem;
}

.lead,
.surface-card p,
.section-heading p,
.archive-link span,
.info-card p,
.split-panel p {
  margin: 0;
  color: var(--tt-muted);
  font-size: 1.02rem;
  line-height: 1.75;
}

.hero-note {
  align-self: stretch;
}

.hero-note p {
  font-size: 1.06rem;
  line-height: 1.88;
}

.crumb-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  color: var(--tt-muted);
  font-size: 0.92rem;
}

.crumb-row a,
.text-link,
.archive-link strong {
  color: var(--tt-ink);
  font-weight: 700;
  text-decoration: none;
}

.crumb-row a:hover,
.text-link:hover,
.archive-link:hover strong {
  text-decoration: underline;
}

.stat-row,
.feature-row,
.mini-link-row,
.micro-link-list,
.soft-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.stat-chip,
.pill-tag,
.feature-chip,
.mini-link-row span,
.micro-link,
.soft-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border-radius: var(--tt-radius-sm);
  border: 1px solid var(--tt-border);
  background: var(--tt-surface-soft);
  color: var(--tt-ink);
  font-size: 0.83rem;
}

.stat-chip,
.pill-tag {
  font-weight: 700;
  letter-spacing: 0.03em;
}

.feature-chip,
.micro-link,
.soft-list span,
.mini-link-row span {
  color: var(--tt-muted);
}

.split-grid {
  margin-top: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.split-panel {
  min-height: 360px;
  padding: 30px;
  color: inherit;
  text-decoration: none;
}

.panel-note {
  max-width: 34ch;
}

.split-panel-teaching {
  background:
    linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft)),
    linear-gradient(135deg, rgba(29, 78, 216, 0.12), transparent 60%);
}

.split-panel-slp {
  background:
    linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft)),
    linear-gradient(135deg, rgba(15, 118, 110, 0.12), transparent 60%);
}

.panel-cta,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  gap: 8px;
  padding: 13px 18px;
  border-radius: var(--tt-radius-sm);
  background: var(--tt-button);
  color: var(--tt-button-text);
  font-weight: 700;
  text-decoration: none;
}

.panel-cta:hover,
.button-link:hover {
  background: var(--tt-button-hover);
  color: var(--tt-button-text);
  transform: translateY(-1px);
}

.section-block {
  position: relative;
  margin-top: 38px;
  padding-left: clamp(18px, 4vw, 52px);
}

.section-block::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--tt-surface);
  border: 3px solid var(--tt-accent);
  box-shadow: 0 0 0 7px var(--tt-accent-soft);
}

.section-heading {
  display: flex;
  gap: 16px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 18px;
}

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

.spotlight-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
}

.spotlight-grid--single {
  grid-template-columns: minmax(0, 760px);
}

.surface-card {
  padding: 24px;
}

.card-summary {
  max-width: 40ch;
}

.surface-card:hover,
.split-panel:hover,
.info-card:hover,
.archive-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 34px 84px rgba(7, 16, 24, 0.16);
}

body[data-theme="dark"] .surface-card:hover,
body[data-theme="dark"] .split-panel:hover,
body[data-theme="dark"] .info-card:hover,
body[data-theme="dark"] .archive-link:hover {
  box-shadow: 0 34px 84px rgba(0, 0, 0, 0.42);
}

.card-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.soft-note {
  color: var(--tt-muted);
  font-size: 0.92rem;
}

.course-card {
  border-color: var(--course-accent);
  background:
    linear-gradient(180deg, var(--course-soft), var(--tt-surface-soft));
}

body[data-theme="dark"] .course-card {
  background:
    linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
}

.course-card .button-link {
  background: var(--course-accent);
  color: #ffffff;
}

.course-card .button-link:hover {
  background: var(--course-accent);
  filter: brightness(0.94);
}

.spotlight-card--feature {
  background:
    linear-gradient(135deg, rgba(29, 78, 216, 0.1), transparent 62%),
    linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
}

.spotlight-card--slp {
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.1), transparent 62%),
    linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
}

.empty-card {
  background:
    linear-gradient(135deg, rgba(29, 78, 216, 0.08), transparent 65%),
    linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
}

.archive-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--tt-border);
  border-radius: 24px 34px 24px 34px;
  background: linear-gradient(180deg, var(--tt-surface), var(--tt-surface-soft));
  text-decoration: none;
}

.archive-link strong {
  font-size: 1.05rem;
}

.tt-shell {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(7, 16, 24, 0.16);
  background: rgba(255, 255, 255, 0.98);
  color: #071018;
  box-shadow: 0 10px 26px rgba(7, 16, 24, 0.12);
  backdrop-filter: blur(14px);
  font-family: var(--tt-font-sans);
  font-size: 0.86rem;
}

body.tt-has-shell {
  padding-top: calc(var(--tt-shell-height) + 18px);
}

.tt-shell__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.tt-shell--slp {
  border-color: rgba(15, 118, 110, 0.2);
}

.tt-shell__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.tt-shell__brand-text {
  font-weight: 700;
}

.tt-shell__links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.tt-shell__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  border-radius: var(--tt-radius-sm);
  background: rgba(29, 78, 216, 0.12);
  color: #1d4ed8;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tt-shell--slp .tt-shell__badge {
  background: rgba(15, 118, 110, 0.12);
  color: #0f766e;
}

.tt-shell__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid rgba(7, 16, 24, 0.16);
  border-radius: var(--tt-radius-sm);
  background: rgba(255, 255, 255, 0.92);
  color: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
}

.tt-shell__link:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.tt-shell__link.is-active {
  background: #071018;
  border-color: #071018;
  color: #ffffff;
}

.tt-shell--slp .tt-shell__link.is-active {
  background: #0f766e;
  border-color: #0f766e;
}

@media (max-width: 1040px) {
  .hero-grid,
  .split-grid,
  .card-grid,
  .card-grid-wide,
  .spotlight-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .utility-bar,
  .section-heading {
    align-items: start;
    flex-direction: column;
  }

  .page-frame::before {
    left: 18px;
    top: 178px;
  }

  h1 {
    max-width: 13ch;
  }
}

@media (max-width: 640px) {
  .page-frame {
    padding: 18px 14px 60px;
  }

  .utility-bar,
  .hero-plate,
  .split-panel,
  .surface-card {
    padding: 18px;
  }

  .section-block {
    padding-left: 28px;
  }

  .tt-shell {
    padding: 10px 12px;
  }

  body.tt-has-shell {
    padding-top: calc(var(--tt-shell-height) + 12px);
  }

  .tt-shell__inner {
    flex-direction: column;
    align-items: start;
  }

  .tt-shell__links {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  body[data-page] a,
  body[data-page] button,
  body[data-page],
  .surface-card,
  .split-panel,
  .info-card,
  .archive-link {
    transition: none;
  }
}

body[data-page="home"],
body[data-page="teaching"],
body[data-page="course"],
body[data-page="slp"],
body[data-page="slp-collection"] {
  --tt-ui-bg: #09090b;
  --tt-ui-surface: #111113;
  --tt-ui-surface-2: #18181b;
  --tt-ui-surface-3: #27272a;
  --tt-ui-border: #27272a;
  --tt-ui-border-2: #3f3f46;
  --tt-ui-text: #fafafa;
  --tt-ui-text-2: #a1a1aa;
  --tt-ui-text-3: #71717a;
  --tt-ui-accent: #818cf8;
  --tt-ui-accent-glow: rgba(129, 140, 248, 0.14);
  --tt-ui-accent-soft: rgba(129, 140, 248, 0.52);
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(129, 140, 248, 0.12), transparent 24%),
    radial-gradient(circle at bottom right, rgba(34, 211, 238, 0.08), transparent 28%),
    linear-gradient(180deg, #09090b 0%, #0d0d12 52%, #111113 100%);
  color: var(--tt-ui-text);
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

body[data-page="slp"],
body[data-page="slp-collection"] {
  --tt-ui-accent: #34d399;
  --tt-ui-accent-glow: rgba(52, 211, 153, 0.14);
  --tt-ui-accent-soft: rgba(52, 211, 153, 0.52);
  background:
    radial-gradient(circle at top left, rgba(52, 211, 153, 0.12), transparent 24%),
    radial-gradient(circle at bottom right, rgba(34, 211, 238, 0.08), transparent 28%),
    linear-gradient(180deg, #09090b 0%, #0d1011 52%, #111312 100%);
}

body[data-theme="light"][data-page="home"],
body[data-theme="light"][data-page="teaching"],
body[data-theme="light"][data-page="course"],
body[data-theme="light"][data-page="slp"],
body[data-theme="light"][data-page="slp-collection"] {
  --tt-ui-bg: #f8fafc;
  --tt-ui-surface: #ffffff;
  --tt-ui-surface-2: #f3f4f6;
  --tt-ui-surface-3: #e5e7eb;
  --tt-ui-border: #d4d4d8;
  --tt-ui-border-2: #cbd5e1;
  --tt-ui-text: #09090b;
  --tt-ui-text-2: #3f3f46;
  --tt-ui-text-3: #52525b;
  background:
    radial-gradient(circle at top left, rgba(129, 140, 248, 0.08), transparent 22%),
    radial-gradient(circle at bottom right, rgba(34, 211, 238, 0.08), transparent 24%),
    linear-gradient(180deg, #f8fafc 0%, #f5f7fb 52%, #eef2f7 100%);
}

body[data-theme="light"][data-page="slp"],
body[data-theme="light"][data-page="slp-collection"] {
  background:
    radial-gradient(circle at top left, rgba(52, 211, 153, 0.08), transparent 22%),
    radial-gradient(circle at bottom right, rgba(34, 211, 238, 0.08), transparent 24%),
    linear-gradient(180deg, #f8fafc 0%, #f5faf7 52%, #eef6f1 100%);
}

.tt-landing-page,
.tt-workspace {
  color: var(--tt-ui-text);
}

.tt-landing-page a,
.tt-landing-page button,
.tt-workspace a,
.tt-workspace button {
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    color 140ms ease,
    transform 140ms ease,
    box-shadow 140ms ease,
    opacity 140ms ease;
}

.tt-landing-page a:focus-visible,
.tt-landing-page button:focus-visible,
.tt-workspace a:focus-visible,
.tt-workspace button:focus-visible {
  outline: 3px solid var(--tt-ui-accent);
  outline-offset: 3px;
}

.tt-theme-toggle,
.tt-top-link,
.tt-sidebar-toggle,
.tt-sidebar__utility,
.tt-landing-cta,
.tt-landing-backlink {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 8px;
  border: 1px solid var(--tt-ui-border);
  background: var(--tt-ui-surface-2);
  color: var(--tt-ui-text-2);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
}

.tt-theme-toggle:hover,
.tt-top-link:hover,
.tt-sidebar-toggle:hover,
.tt-sidebar__utility:hover,
.tt-landing-cta:hover,
.tt-landing-backlink:hover {
  border-color: var(--tt-ui-border-2);
  color: var(--tt-ui-text);
  transform: translateY(-1px);
}

.tt-top-link.is-active,
.tt-landing-cta {
  background: var(--tt-ui-accent);
  border-color: var(--tt-ui-accent);
  color: #ffffff;
}

.tt-theme-toggle {
  gap: 10px;
  cursor: pointer;
}

.tt-theme-toggle__text {
  white-space: nowrap;
}

.tt-theme-toggle__state {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  min-height: 28px;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--tt-ui-surface-3);
  color: var(--tt-ui-text);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* --------------------------------------------------------------------- *
 * Theme picker menu (SLP only)                                           *
 *                                                                         *
 * Used in two nav variants:                                               *
 *   .tt-theme-menu--shell   — activity page shell (white fixed nav)       *
 *   .tt-theme-menu--landing — landing/collection hubs (dark tt-ui panel)  *
 *                                                                         *
 * The dropdown panel uses shared --tt-* tokens so it re-skins under each  *
 * theme automatically. Trigger styles differ per variant so they blend    *
 * into their surrounding chrome.                                          *
 * --------------------------------------------------------------------- */

.tt-theme-menu {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-family: inherit;
}

.tt-theme-menu__trigger {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 0 12px 0 10px;
  border-radius: var(--tt-radius-sm, 999px);
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  border: 1px solid transparent;
  transition:
    transform 140ms ease,
    background-color 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease;
}

.tt-theme-menu__trigger:hover {
  transform: translateY(-1px);
}

.tt-theme-menu__trigger:focus-visible {
  outline: 3px solid var(--tt-accent-soft, rgba(15, 118, 110, 0.3));
  outline-offset: 2px;
}

.tt-theme-menu__swatch {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 1px solid rgba(7, 16, 24, 0.14);
  background: currentColor;
  flex-shrink: 0;
}

.tt-theme-menu__caption {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  text-align: left;
}

.tt-theme-menu__eyebrow {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.62;
}

.tt-theme-menu__label {
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.tt-theme-menu__caret {
  display: inline-block;
  font-size: 0.7rem;
  opacity: 0.7;
  transition: transform 160ms ease;
}

.tt-theme-menu[data-open="true"] .tt-theme-menu__caret {
  transform: rotate(180deg);
}

.tt-theme-menu__list {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 1200;
  min-width: 240px;
  margin: 0;
  padding: 6px;
  list-style: none;
  border-radius: var(--tt-radius-md, 12px);
  border: 1px solid var(--tt-border, rgba(7, 16, 24, 0.14));
  background: var(--tt-surface, #ffffff);
  color: var(--tt-ink, #111827);
  box-shadow: var(--tt-shadow, 0 18px 42px rgba(7, 16, 24, 0.18));
  font-family: var(--tt-font-sans, inherit);
}

.tt-theme-menu__list[hidden] {
  display: none;
}

.tt-theme-menu__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: calc(var(--tt-radius-md, 12px) - 4px);
  cursor: pointer;
  user-select: none;
  outline: none;
}

.tt-theme-menu__item:hover,
.tt-theme-menu__item:focus-visible {
  background: var(--tt-accent-soft, rgba(15, 118, 110, 0.12));
  color: var(--tt-accent-strong, var(--tt-ink, #111827));
}

.tt-theme-menu__item.is-active {
  background: var(--tt-accent-soft, rgba(15, 118, 110, 0.18));
  color: var(--tt-accent-strong, var(--tt-ink, #111827));
}

.tt-theme-menu__item .tt-theme-menu__swatch {
  width: 22px;
  height: 22px;
  border-color: var(--tt-border, rgba(7, 16, 24, 0.16));
}

.tt-theme-menu__text {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  min-width: 0;
}

.tt-theme-menu__name {
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.15;
}

.tt-theme-menu__desc {
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--tt-muted, #6b7280);
  line-height: 1.3;
}

.tt-theme-menu__check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--tt-accent, currentColor);
  opacity: 0;
  transform: scale(0.8);
  transition:
    opacity 140ms ease,
    transform 140ms ease;
}

.tt-theme-menu__item.is-active .tt-theme-menu__check {
  opacity: 1;
  transform: scale(1);
}

/* Shell variant — light fixed nav on activity pages */
.tt-theme-menu--shell .tt-theme-menu__trigger {
  border-color: rgba(7, 16, 24, 0.16);
  background: rgba(255, 255, 255, 0.92);
  color: #071018;
}

.tt-theme-menu--shell .tt-theme-menu__trigger:hover {
  border-color: rgba(7, 16, 24, 0.32);
  background: #ffffff;
}

/* Landing/collection variant — dark tt-ui nav */
.tt-theme-menu--landing .tt-theme-menu__trigger {
  border-color: var(--tt-ui-border, rgba(255, 255, 255, 0.14));
  background: var(--tt-ui-surface-2, rgba(15, 23, 42, 0.7));
  color: var(--tt-ui-text-2, #cbd5e1);
}

.tt-theme-menu--landing .tt-theme-menu__trigger:hover {
  border-color: var(--tt-ui-border-2, rgba(255, 255, 255, 0.28));
  color: var(--tt-ui-text, #f8fafc);
}

.tt-theme-menu--landing .tt-theme-menu__trigger:focus-visible {
  outline-color: var(--tt-ui-accent, var(--tt-accent-soft, #34d399));
}

/* Shell sits above other page content; make sure its dropdown floats free. */
.tt-shell .tt-theme-menu__list,
.tt-landing-nav .tt-theme-menu__list {
  right: 0;
  left: auto;
}

.tt-shell__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

@media (max-width: 640px) {
  .tt-theme-menu__list {
    min-width: min(92vw, 280px);
  }

  .tt-shell__actions {
    width: 100%;
    justify-content: space-between;
  }
}

.tt-landing-page {
  width: min(1120px, calc(100vw - 24px));
  margin: 0 auto;
  padding: 18px 0 72px;
}

.tt-teaching-home {
  width: min(1280px, calc(100vw - 24px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 14px 0 32px;
}

.tt-landing-nav {
  position: sticky;
  top: 14px;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 0 24px;
}

.tt-teaching-home__nav {
  position: sticky;
  top: 14px;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  padding: 0 0 18px;
}

.tt-landing-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--tt-ui-text-2);
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
}

.tt-landing-brand__mark,
.tt-sidebar__mark {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--tt-ui-accent);
  color: #ffffff;
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.78rem;
  font-weight: 700;
}

.tt-landing-brand__text,
.tt-sidebar__name,
.tt-section-head__count,
.tt-breadcrumb,
.tt-meta-item,
.tt-sidebar__count,
.tt-type-badge {
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
}

.tt-landing-nav__actions,
.tt-workspace__topbar-actions,
.tt-focus-chips,
.tt-landing-links,
.tt-home-actions,
.tt-home-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.tt-home-nav-link {
  color: var(--tt-ui-text-2);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.tt-home-nav-link:hover {
  color: var(--tt-ui-text);
}

.tt-landing-hero,
.tt-entry-card,
.tt-link-card,
.tt-empty-card {
  border: 1px solid var(--tt-ui-border);
  background: linear-gradient(180deg, var(--tt-ui-surface), var(--tt-ui-surface-2));
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.18);
}

body[data-theme="light"] .tt-landing-hero,
body[data-theme="light"] .tt-entry-card,
body[data-theme="light"] .tt-link-card,
body[data-theme="light"] .tt-empty-card {
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.08);
}

.tt-landing-hero {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 4vw, 2.5rem);
  border-radius: 12px;
  text-align: center;
}

.tt-teaching-home__hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  min-height: calc(100vh - 76px);
  align-content: center;
  gap: 28px;
  overflow: hidden;
  padding: 42px 0 24px;
}

.tt-teaching-home__hero::before {
  content: "";
  position: absolute;
  inset: 30% 0 0;
  border: 1px solid var(--tt-ui-border);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.42;
  pointer-events: none;
}

body[data-theme="light"] .tt-teaching-home__hero::before {
  background:
    linear-gradient(90deg, rgba(15, 23, 42, 0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(15, 23, 42, 0.08) 1px, transparent 1px);
  opacity: 0.52;
}

.tt-teaching-home__copy,
.tt-home-map,
.tt-home-book-stage {
  position: relative;
  z-index: 1;
}

.tt-teaching-home__copy {
  display: grid;
  max-width: 1040px;
  gap: 14px;
}

.tt-home-kicker {
  margin: 0;
  color: var(--tt-ui-accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.tt-teaching-home__copy h1 {
  max-width: 1020px;
  margin: 0;
  color: var(--tt-ui-text);
  font-size: 5.75rem;
  font-weight: 720;
  line-height: 0.98;
  letter-spacing: 0;
}

.tt-home-statement {
  max-width: 820px;
  margin: 0;
  color: var(--tt-ui-text);
  font-size: 2.05rem;
  font-weight: 650;
  line-height: 1.12;
}

.tt-teaching-home__copy p:not(.tt-home-kicker):not(.tt-home-statement) {
  max-width: 760px;
  margin: 0;
  color: var(--tt-ui-text-2);
  font-size: 1.12rem;
  line-height: 1.7;
}

.tt-home-primary,
.tt-home-open-book__cta {
  min-height: 44px;
  border-radius: 8px;
  text-decoration: none;
}

.tt-home-primary,
.tt-home-open-book__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  font-size: 0.88rem;
  font-weight: 800;
}

.tt-home-primary {
  background: var(--tt-ui-accent);
  color: #ffffff;
}

.tt-home-metrics {
  gap: 16px;
  color: var(--tt-ui-text-3);
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.78rem;
}

.tt-home-metrics strong {
  color: var(--tt-ui-text);
}

.tt-home-map {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: stretch;
  gap: 10px;
  perspective: 900px;
}

.tt-home-book-spine {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 108px;
  padding: 14px 14px 14px 18px;
  border: 1px solid var(--tt-ui-border);
  border-left: 8px solid var(--tt-card-accent, var(--tt-ui-accent));
  border-radius: 8px;
  background:
    linear-gradient(90deg, var(--tt-card-glow, rgba(52, 211, 153, 0.14)), transparent 34%),
    linear-gradient(180deg, rgba(15, 23, 42, 0.86), rgba(15, 23, 42, 0.62));
  color: inherit;
  cursor: pointer;
  overflow: hidden;
  text-align: left;
  box-shadow:
    inset 14px 0 18px rgba(255, 255, 255, 0.04),
    inset -16px 0 22px rgba(0, 0, 0, 0.18);
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

body[data-theme="light"] .tt-home-book-spine {
  background:
    linear-gradient(90deg, var(--tt-card-glow, rgba(52, 211, 153, 0.14)), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(241, 245, 249, 0.78));
  box-shadow:
    inset 14px 0 18px rgba(255, 255, 255, 0.62),
    inset -16px 0 22px rgba(15, 23, 42, 0.08);
}

.tt-home-book-spine:hover,
.tt-home-book-spine.is-active {
  border-color: var(--tt-card-accent, var(--tt-ui-accent));
  box-shadow:
    0 18px 32px rgba(0, 0, 0, 0.16),
    inset 14px 0 18px rgba(255, 255, 255, 0.05),
    inset -16px 0 22px rgba(0, 0, 0, 0.18);
  transform: translateY(-4px);
}

.tt-home-book-spine:focus-visible {
  outline: 2px solid var(--tt-card-accent, var(--tt-ui-accent));
  outline-offset: 3px;
}

.tt-home-book-spine.is-pulling {
  animation: ttBookSpinePull 260ms ease both;
}

.tt-home-book-spine__code {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 8px;
  background: var(--tt-card-glow, var(--tt-ui-accent-glow));
  color: var(--tt-card-accent, var(--tt-ui-accent));
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.82rem;
  font-weight: 800;
}

.tt-home-book-spine__body {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.tt-home-book-spine__body strong {
  color: var(--tt-ui-text);
  font-size: 0.95rem;
  line-height: 1.18;
}

.tt-home-book-spine__body span {
  color: var(--tt-ui-text-3);
  font-size: 0.78rem;
}

.tt-home-book-spine__stripe {
  position: absolute;
  inset: auto 0 0;
  height: 2px;
  background: var(--tt-card-accent, var(--tt-ui-accent));
  transform: scaleX(0.24);
  transform-origin: left;
  transition: transform 180ms ease var(--tt-node-delay, 0ms);
}

.tt-home-book-spine:hover .tt-home-book-spine__stripe,
.tt-home-book-spine.is-active .tt-home-book-spine__stripe {
  transform: scaleX(1);
}

.tt-home-book-stage {
  min-height: 0;
}

.tt-home-book-stage.is-closing .tt-home-open-book {
  animation: ttBookClose 240ms ease both;
}

.tt-home-open-book {
  position: relative;
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) minmax(0, 1fr);
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--tt-ui-border);
  border-radius: 8px;
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.86), rgba(15, 23, 42, 0.64));
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.28);
  transform-origin: top center;
  animation: ttBookOpen 360ms cubic-bezier(0.2, 0.86, 0.28, 1) both;
}

body[data-theme="light"] .tt-home-open-book {
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.88));
  box-shadow: 0 28px 70px rgba(15, 23, 42, 0.14);
}

.tt-home-open-book::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(62px + ((100% - 62px) / 2));
  width: 1px;
  background: var(--tt-ui-border);
  box-shadow: 0 0 28px rgba(0, 0, 0, 0.18);
}

.tt-home-open-book__spine {
  display: grid;
  place-items: center;
  min-height: 210px;
  background: var(--tt-card-accent, var(--tt-ui-accent));
  color: #ffffff;
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-weight: 800;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.tt-home-open-book__page {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.tt-home-open-book__page--right {
  background: rgba(255, 255, 255, 0.025);
}

body[data-theme="light"] .tt-home-open-book__page--right {
  background: rgba(15, 23, 42, 0.025);
}

.tt-home-open-book__eyebrow {
  margin: 0;
  color: var(--tt-card-accent, var(--tt-ui-accent));
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
}

.tt-home-open-book h2,
.tt-home-open-book h3 {
  margin: 0;
  color: var(--tt-ui-text);
  letter-spacing: 0;
}

.tt-home-open-book h2 {
  font-size: 1.75rem;
  line-height: 1.12;
}

.tt-home-open-book h3 {
  font-size: 1.02rem;
}

.tt-home-open-book p {
  margin: 0;
  color: var(--tt-ui-text-2);
  font-size: 0.98rem;
  line-height: 1.6;
}

.tt-home-open-book__focus {
  display: grid;
  gap: 8px;
}

.tt-home-open-book__focus span {
  color: var(--tt-ui-text-2);
  font-size: 0.88rem;
  line-height: 1.45;
}

.tt-home-open-book__cta {
  justify-self: start;
  min-height: 34px;
  padding: 0 12px;
  background: var(--tt-card-accent, var(--tt-ui-accent));
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
}

@keyframes ttBookSpinePull {
  0% {
    transform: translateY(0) rotateX(0);
  }
  52% {
    transform: translateY(18px) rotateX(-7deg);
  }
  100% {
    transform: translateY(-4px) rotateX(0);
  }
}

@keyframes ttBookOpen {
  0% {
    opacity: 0;
    transform: translateY(-18px) rotateX(14deg) scaleY(0.92);
  }
  58% {
    opacity: 1;
    transform: translateY(6px) rotateX(-2deg) scaleY(1.02);
  }
  100% {
    opacity: 1;
    transform: translateY(0) rotateX(0) scaleY(1);
  }
}

@keyframes ttBookClose {
  0% {
    opacity: 1;
    transform: translateY(0) rotateX(0) scaleY(1);
  }
  100% {
    opacity: 0;
    transform: translateY(-16px) rotateX(10deg) scaleY(0.92);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tt-home-book-spine,
  .tt-home-book-spine.is-pulling,
  .tt-home-open-book,
  .tt-home-book-stage.is-closing .tt-home-open-book {
    animation: none;
    transition: none;
  }
}

.tt-card-list--compact {
  gap: 10px;
}

.tt-landing-badge,
.tt-entry-card__kicker,
.tt-course-hero__tag,
.tt-focus-section h2,
.tt-content-section__head h2,
.tt-sidebar__label,
.tt-section-head h2 {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tt-landing-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding: 6px 12px;
  border: 1px solid var(--tt-ui-border-2);
  border-radius: 999px;
  background: var(--tt-ui-surface-2);
  color: var(--tt-ui-accent);
  font-size: 0.74rem;
  font-weight: 600;
}

.tt-landing-badge__dot,
.tt-entry-card__indicator,
.tt-course-hero__indicator,
.tt-focus-chip__dot,
.tt-sidebar__dot {
  border-radius: 50%;
  background: var(--tt-ui-accent);
  box-shadow: 0 0 12px var(--tt-ui-accent-soft);
}

.tt-landing-badge__dot {
  width: 7px;
  height: 7px;
}

.tt-landing-page h1,
.tt-workspace h1,
.tt-entry-card h3,
.tt-link-card h3,
.tt-empty-card h2 {
  margin: 0;
  color: var(--tt-ui-text);
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.tt-landing-page h1,
.tt-workspace h1 {
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 700;
}

.tt-entry-card h3,
.tt-link-card h3,
.tt-empty-card h2,
.tt-content-section__head h2 {
  font-size: 1.18rem;
  font-weight: 600;
}

.tt-landing-hero p,
.tt-entry-card p,
.tt-link-card p,
.tt-course-hero__subtitle,
.tt-course-hero__summary,
.tt-simple-copy,
.tt-empty-card p {
  margin: 0;
  color: var(--tt-ui-text-2);
  line-height: 1.65;
}

.tt-landing-hero p {
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: clamp(1rem, 2vw, 1.12rem);
}

.tt-landing-section,
.tt-content-section,
.tt-focus-section {
  margin-top: 30px;
}

.tt-workspace [id] {
  scroll-margin-top: 104px;
}

.tt-section-head,
.tt-content-section__head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.tt-section-head h2,
.tt-content-section__head h2,
.tt-focus-section h2,
.tt-sidebar__label {
  margin: 0;
  color: var(--tt-ui-text-3);
  font-size: 0.7rem;
  font-weight: 700;
}

.tt-section-head__count,
.tt-content-section__head span,
.tt-sidebar__count,
.tt-meta-item {
  color: var(--tt-ui-text-3);
  font-size: 0.72rem;
}

.tt-entry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--tt-ui-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--tt-ui-border);
}

.tt-entry-grid--split {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tt-entry-card {
  position: relative;
  display: grid;
  gap: 16px;
  min-height: 240px;
  padding: 28px;
  color: inherit;
  text-decoration: none;
  overflow: hidden;
}

.tt-entry-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 20%, var(--tt-card-glow, rgba(129, 140, 248, 0.12)) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 180ms ease;
  pointer-events: none;
}

.tt-entry-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--tt-card-accent, var(--tt-ui-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.tt-entry-card > * {
  position: relative;
  z-index: 1;
}

.tt-entry-card:hover::before {
  opacity: 1;
}

.tt-entry-card:hover::after {
  transform: scaleX(1);
}

.tt-entry-card:hover,
.tt-link-card:hover {
  transform: translateY(-2px);
}

.tt-entry-card__indicator {
  width: 8px;
  height: 8px;
  background: var(--tt-card-dim, var(--tt-ui-accent));
}

.tt-entry-card:hover .tt-entry-card__indicator {
  background: var(--tt-card-accent, var(--tt-ui-accent));
}

.tt-entry-card__body {
  display: grid;
  gap: 8px;
}

.tt-entry-card__kicker {
  color: var(--tt-ui-text-3);
  font-size: 0.72rem;
  font-weight: 700;
}

.tt-entry-card__footer,
.tt-link-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.tt-entry-card__meta,
.tt-entry-card__open,
.tt-link-card__open {
  color: var(--tt-ui-text-3);
  font-size: 0.78rem;
  font-weight: 600;
}

.tt-entry-card--muted {
  min-height: 200px;
}

.tt-workspace {
  min-height: 100vh;
}

.tt-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 268px;
  padding: 0 12px 16px;
  border-right: 1px solid var(--tt-ui-border);
  background: var(--tt-ui-surface);
  overflow-y: auto;
  z-index: 50;
}

.tt-sidebar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 6px;
  color: var(--tt-ui-text);
  text-decoration: none;
}

.tt-sidebar__section {
  padding: 10px 0 6px;
}

.tt-sidebar__stack {
  display: grid;
  gap: 4px;
}

.tt-sidebar__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--tt-ui-text-2);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  position: relative;
}

.tt-sidebar__item:hover {
  background: var(--tt-ui-surface-2);
  color: var(--tt-ui-text);
}

.tt-sidebar__item.is-active {
  background: var(--tt-sidebar-accent-glow, var(--tt-ui-accent-glow));
  color: var(--tt-sidebar-accent, var(--tt-ui-accent));
}

.tt-sidebar__dot {
  width: 6px;
  height: 6px;
  background: var(--tt-sidebar-accent, var(--tt-ui-accent));
}

.tt-sidebar__count {
  margin-left: auto;
}

.tt-sidebar__footer {
  display: grid;
  gap: 8px;
  padding: 14px 0 8px;
}

.tt-sidebar__utility {
  justify-content: flex-start;
}

.tt-workspace__main {
  margin-left: 268px;
  width: calc(100% - 268px);
  padding: 18px clamp(1.25rem, 4vw, 3rem) 72px;
}

.tt-workspace__topbar {
  position: sticky;
  top: 14px;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  padding: 10px 12px;
  border: 1px solid var(--tt-ui-border);
  border-radius: 10px;
  background: var(--tt-ui-surface);
  backdrop-filter: blur(12px);
}

.tt-sidebar-toggle {
  display: none;
}

.tt-main-block {
  display: grid;
  gap: 18px;
}

.tt-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  color: var(--tt-ui-text-3);
  font-size: 0.74rem;
}

.tt-breadcrumb a {
  color: var(--tt-ui-text-3);
  text-decoration: none;
}

.tt-breadcrumb__current {
  color: var(--tt-ui-accent);
}

.tt-course-hero {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--tt-ui-border);
}

.tt-course-hero__indicator-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.tt-course-hero__indicator {
  width: 10px;
  height: 10px;
  background: var(--tt-course-accent, var(--tt-ui-accent));
  box-shadow: 0 0 12px var(--tt-course-accent-glow, var(--tt-ui-accent-soft));
}

.tt-course-hero__tag {
  color: var(--tt-course-accent, var(--tt-ui-accent));
  font-size: 0.72rem;
  font-weight: 700;
}

.tt-course-hero__subtitle {
  font-size: 1rem;
  margin-top: 8px;
}

.tt-course-hero__summary {
  margin-top: 10px;
  max-width: 64ch;
}

.tt-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 18px;
}

.tt-meta-item strong {
  color: var(--tt-ui-text-2);
  font-weight: 700;
}

.tt-focus-chips {
  gap: 8px;
}

.tt-focus-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--tt-ui-border);
  border-radius: 999px;
  background: var(--tt-ui-surface-2);
  color: var(--tt-ui-text-2);
  font-size: 0.8rem;
  font-weight: 500;
}

.tt-focus-chip__dot {
  width: 5px;
  height: 5px;
}

.tt-focus-chips--landing {
  justify-content: center;
  margin-top: 18px;
}

.tt-card-list {
  display: grid;
  gap: 12px;
}

.tt-link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  border-radius: 10px;
  color: inherit;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.tt-link-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--tt-card-accent, var(--tt-ui-accent));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 180ms ease;
}

.tt-link-card:hover::before {
  transform: scaleY(1);
}

.tt-link-card__icon {
  display: inline-grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 10px;
  border: 1px solid var(--tt-ui-border);
  background: var(--tt-card-glow, var(--tt-ui-accent-glow));
  color: var(--tt-card-accent, var(--tt-ui-accent));
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  flex: 0 0 auto;
}

.tt-link-card__body {
  flex: 1;
  display: grid;
  gap: 4px;
}

.tt-link-card__body h3 {
  font-size: 1rem;
}

.tt-link-card__body p {
  font-size: 0.88rem;
}

.tt-link-card__meta {
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  min-width: 160px;
}

.tt-type-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid var(--tt-ui-border);
  background: var(--tt-ui-surface-2);
  color: var(--tt-ui-text-3);
  font-size: 0.7rem;
  font-weight: 600;
}

.tt-empty-card {
  padding: 22px;
  border-radius: 10px;
}

.tt-curriculum-metrics,
.tt-curriculum-resource-grid,
.tt-curriculum-unit-grid,
.tt-curriculum-coursework-grid,
.tt-curriculum-assessment-grid,
.tt-curriculum-overview {
  display: grid;
  gap: 12px;
}

.tt-curriculum-metrics {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.tt-curriculum-metric,
.tt-curriculum-overview > div,
.tt-curriculum-theme__intro,
.tt-curriculum-unit,
.tt-curriculum-coursework,
.tt-curriculum-assessment,
.tt-curriculum-step,
.tt-curriculum-resource {
  border: 1px solid var(--tt-ui-border);
  background: linear-gradient(180deg, var(--tt-ui-surface), var(--tt-ui-surface-2));
  border-radius: 8px;
}

.tt-curriculum-metric {
  min-height: 88px;
  padding: 16px;
}

.tt-curriculum-metric strong,
.tt-curriculum-overview strong {
  display: block;
  color: var(--tt-ui-text);
  font-size: 1.35rem;
  line-height: 1.1;
}

.tt-curriculum-metric span,
.tt-curriculum-overview span,
.tt-curriculum-unit__meta,
.tt-curriculum-subtopics span,
.tt-curriculum-coverage,
.tt-curriculum-coursework p,
.tt-curriculum-assessment p,
.tt-curriculum-step p,
.tt-curriculum-resource__body span {
  color: var(--tt-ui-text-2);
}

.tt-curriculum-resource-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tt-curriculum-resource {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  min-height: 168px;
  padding: 16px;
  color: inherit;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.tt-curriculum-resource::before,
.tt-curriculum-unit::before,
.tt-curriculum-theme__intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, var(--tt-card-glow, var(--tt-unit-glow, var(--tt-ui-accent-glow))), transparent 65%);
  pointer-events: none;
}

.tt-curriculum-resource > *,
.tt-curriculum-unit > *,
.tt-curriculum-theme__intro > * {
  position: relative;
  z-index: 1;
}

.tt-curriculum-resource__code,
.tt-curriculum-code,
.tt-curriculum-step__number {
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--tt-ui-border);
  background: var(--tt-ui-surface-2);
  color: var(--tt-card-accent, var(--tt-unit-accent, var(--tt-ui-accent)));
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-weight: 700;
}

.tt-curriculum-resource__code {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  font-size: 0.7rem;
}

.tt-curriculum-resource__body {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.tt-curriculum-resource__body strong,
.tt-curriculum-unit h3,
.tt-curriculum-coursework h3,
.tt-curriculum-assessment__top strong,
.tt-curriculum-step h3 {
  color: var(--tt-ui-text);
  line-height: 1.2;
}

.tt-curriculum-resource__body strong,
.tt-curriculum-unit h3,
.tt-curriculum-coursework h3,
.tt-curriculum-step h3 {
  margin: 0;
  font-family:
    "Space Grotesk",
    "Trebuchet MS",
    sans-serif;
  font-size: 1rem;
  letter-spacing: 0;
}

.tt-curriculum-resource__open {
  grid-column: 1 / -1;
  align-self: end;
  color: var(--tt-card-accent, var(--tt-ui-accent));
  font-size: 0.8rem;
  font-weight: 700;
}

.tt-curriculum-overview {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tt-curriculum-overview > div {
  padding: 16px;
}

.tt-curriculum-overview span {
  display: block;
  margin-top: 6px;
  line-height: 1.55;
}

.tt-curriculum-theme__intro {
  position: relative;
  margin-bottom: 12px;
  padding: 18px;
  overflow: hidden;
}

.tt-curriculum-theme__intro p {
  margin: 0;
  color: var(--tt-ui-text-2);
  line-height: 1.65;
}

.tt-curriculum-theme__label {
  margin-bottom: 6px !important;
  color: var(--tt-unit-accent) !important;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tt-curriculum-unit-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tt-curriculum-unit,
.tt-curriculum-coursework,
.tt-curriculum-assessment {
  position: relative;
  padding: 18px;
  overflow: hidden;
}

.tt-curriculum-unit {
  border-top: 3px solid var(--tt-unit-accent);
}

.tt-curriculum-unit__head,
.tt-curriculum-assessment__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.tt-curriculum-code {
  min-width: 46px;
  min-height: 32px;
  padding: 0 10px;
  border-radius: 6px;
  font-size: 0.78rem;
}

.tt-curriculum-status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  border: 1px solid var(--tt-ui-border);
  font-size: 0.7rem;
  font-weight: 700;
}

.tt-curriculum-status--ready {
  color: #34d399;
  background: rgba(52, 211, 153, 0.12);
}

.tt-curriculum-status--partial {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.12);
}

.tt-curriculum-status--planned {
  color: var(--tt-ui-text-3);
  background: var(--tt-ui-surface-2);
}

.tt-curriculum-unit h3,
.tt-curriculum-coursework h3,
.tt-curriculum-step h3 {
  margin-top: 14px;
}

.tt-curriculum-unit__meta {
  margin-top: 6px;
  font-size: 0.78rem;
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
}

.tt-curriculum-subtopics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tt-curriculum-subtopics span {
  padding: 6px 9px;
  border: 1px solid var(--tt-ui-border);
  border-radius: 999px;
  background: var(--tt-ui-surface-2);
  font-size: 0.76rem;
}

.tt-curriculum-coverage {
  margin: 16px 0 0;
  padding-left: 18px;
  font-size: 0.86rem;
  line-height: 1.6;
}

.tt-curriculum-link {
  display: inline-flex;
  width: fit-content;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  margin-top: 16px;
  padding: 0 12px;
  border-radius: 8px;
  background: var(--tt-unit-accent, var(--tt-ui-accent));
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
}

.tt-curriculum-coursework-grid,
.tt-curriculum-assessment-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tt-curriculum-coursework p,
.tt-curriculum-assessment p,
.tt-curriculum-step p {
  margin: 10px 0 0;
  line-height: 1.6;
}

.tt-curriculum-assessment__top span {
  color: var(--tt-ui-accent);
  font-family:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    monospace;
  font-size: 0.9rem;
  font-weight: 700;
}

.tt-curriculum-sequence {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--tt-ui-border);
  border-radius: 8px;
  background: var(--tt-ui-border);
}

.tt-curriculum-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  border: 0;
  border-radius: 0;
}

.tt-curriculum-step__number {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.tt-workspace__backdrop {
  display: none;
}

.tt-simple-copy {
  max-width: 44ch;
}

@media (max-width: 980px) {
  .tt-entry-grid,
  .tt-entry-grid--split {
    grid-template-columns: 1fr;
  }

  .tt-curriculum-metrics,
  .tt-curriculum-resource-grid,
  .tt-curriculum-overview,
  .tt-curriculum-coursework-grid,
  .tt-curriculum-assessment-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tt-curriculum-unit-grid {
    grid-template-columns: 1fr;
  }

  .tt-sidebar {
    transform: translateX(-100%);
    transition: transform 160ms ease;
  }

  body.tt-sidebar-open {
    overflow: hidden;
  }

  body.tt-sidebar-open .tt-sidebar {
    transform: translateX(0);
  }

  .tt-workspace__backdrop {
    display: block;
    position: fixed;
    inset: 0;
    border: 0;
    background: rgba(0, 0, 0, 0.45);
    opacity: 0;
    pointer-events: none;
    z-index: 40;
  }

  body.tt-sidebar-open .tt-workspace__backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .tt-workspace__main {
    margin-left: 0;
    width: 100%;
  }

  .tt-sidebar-toggle {
    display: inline-flex;
  }
}

@media (max-width: 1100px) {
  .tt-teaching-home__copy h1 {
    font-size: 4.45rem;
  }

  .tt-home-statement {
    font-size: 1.68rem;
  }

  .tt-home-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .tt-landing-page {
    width: calc(100vw - 16px);
    padding-bottom: 52px;
  }

  .tt-teaching-home {
    width: calc(100vw - 16px);
    padding-top: 8px;
  }

  .tt-landing-nav,
  .tt-teaching-home__nav,
  .tt-workspace__topbar,
  .tt-section-head,
  .tt-content-section__head,
  .tt-link-card {
    align-items: flex-start;
    flex-direction: column;
  }

  .tt-teaching-home__hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 34px;
  }

  .tt-teaching-home__hero::before {
    inset: 34% 0 4%;
  }

  .tt-teaching-home__copy h1 {
    font-size: 3.05rem;
  }

  .tt-home-statement {
    font-size: 1.32rem;
  }

  .tt-teaching-home__copy p:not(.tt-home-kicker):not(.tt-home-statement) {
    font-size: 1rem;
  }

  .tt-home-map {
    grid-template-columns: 1fr;
  }

  .tt-home-book-spine {
    min-height: 92px;
  }

  .tt-home-open-book {
    grid-template-columns: 1fr;
  }

  .tt-home-open-book::after {
    display: none;
  }

  .tt-home-open-book__spine {
    min-height: 44px;
    writing-mode: horizontal-tb;
    text-orientation: mixed;
  }

  .tt-workspace [id] {
    scroll-margin-top: 164px;
  }

  .tt-curriculum-metrics,
  .tt-curriculum-resource-grid,
  .tt-curriculum-overview,
  .tt-curriculum-coursework-grid,
  .tt-curriculum-assessment-grid {
    grid-template-columns: 1fr;
  }

  .tt-curriculum-step {
    grid-template-columns: 1fr;
  }

  .tt-link-card__meta {
    min-width: 0;
    width: 100%;
    align-items: flex-start;
  }

  .tt-entry-card,
  .tt-landing-hero {
    padding: 20px;
  }
}


/* ── Account / auth pages ─────────────────────────────────────────────────── */

.auth-hero {
  max-width: 560px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 480px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--tt-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.auth-input {
  padding: 12px 16px;
  border-radius: var(--tt-radius-md);
  border: 1.5px solid var(--tt-border);
  background: var(--tt-surface);
  color: var(--tt-ink);
  font-family: var(--tt-font-sans);
  font-size: 1rem;
  width: 100%;
}

.auth-input:focus {
  outline: 3px solid var(--tt-accent-strong);
  outline-offset: 2px;
  border-color: transparent;
}

.auth-input::placeholder {
  color: var(--tt-muted);
  opacity: 0.55;
}

.auth-submit {
  align-self: flex-start;
  cursor: pointer;
  border: none;
  font-family: var(--tt-font-sans);
  font-size: 1rem;
}

.auth-note {
  font-size: 0.9rem;
  color: var(--tt-muted);
  margin: 0;
  min-height: 1.4em;
}

.auth-detail-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 560px;
  padding: 24px;
  border-radius: var(--tt-radius-md);
  border: 1.5px solid var(--tt-border);
  background: var(--tt-surface);
  box-shadow: var(--tt-shadow);
}

.auth-detail-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.auth-detail-row {
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.auth-detail-row dt {
  min-width: 120px;
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--tt-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.auth-detail-row dd {
  margin: 0;
  color: var(--tt-ink);
}

/* Sign-out is a <button> but styled like a nav link */
button.utility-link {
  cursor: pointer;
  border: none;
  font-family: var(--tt-font-sans);
  font-size: 1rem;
}

/* --------------------------------------------------------------------- *
 * Mr. Rowell's Teaching Hub redesign (2026)
 * Namespaced to rh-* so imported activity microsites keep their own UI.
 * --------------------------------------------------------------------- */

:root {
  font-size: 16px;
  --paper: #f6f1e7;
  --paper-hi: #fbf8f1;
  --paper-rail: #efeadd;
  --paper-hover: #ede4c9;
  --ink: #15140f;
  --ink-2: #3d3a30;
  --ink-3: #6b6657;
  --ink-4: #aaa395;
  --rule: rgba(21, 20, 15, 0.18);
  --rule-soft: rgba(21, 20, 15, 0.1);
  --accent: #a8472e;
  --btn-ink: #15140f;
  --btn-ink-text: #fbf8f1;
  --dev-text: #857e6c;
  --book-page: #fbf8f1;
  --book-page-edge: #eee5d2;
  --book-ink: #15140f;
  --book-ink-2: #3d3a30;
  --book-ink-3: #756f60;
  --book-outline: rgba(21, 20, 15, 0.82);
  --book-outline-glow: rgba(21, 20, 15, 0.14);
  --font-display: "Fraunces", "Instrument Serif", Georgia, serif;
  --font-sans: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --t-display-1: 7.75rem;
  --t-display-2: 6rem;
  --t-display-3: 5.5rem;
  --t-display-4: 1.875rem;
  --t-display-5: 1.75rem;
  --t-display-6: 1.4375rem;
  --t-display-7: 1.25rem;
  --t-italic-1: 1.5rem;
  --t-italic-2: 1.0625rem;
  --t-italic-3: 0.9375rem;
  --t-body-1: 1rem;
  --t-body-2: 0.875rem;
  --t-body-3: 0.84375rem;
  --t-body-4: 0.8125rem;
  --t-meta-1: 0.6875rem;
  --t-meta-2: 0.65625rem;
  --t-tag: 0.71875rem;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 56px;
  --space-11: 64px;
  --space-12: 80px;
  --space-13: 96px;
  --shadow-book-spine: inset 1px 0 0 rgba(255, 255, 255, 0.08), inset -1px 0 0 rgba(0, 0, 0, 0.32), 0 4px 8px rgba(0, 0, 0, 0.18);
  --shadow-book-open: 0 30px 60px rgba(0, 0, 0, 0.22), 0 0 0 1px rgba(0, 0, 0, 0.08);
  --motion-scale: 1;
  --ease-open: cubic-bezier(.4, 0, .2, 1);
  --ease-soft: ease;
  --dur-fast: calc(160ms * var(--motion-scale));
  --dur-book-slide: calc(860ms * var(--motion-scale));
  --dur-book-grow: calc(680ms * var(--motion-scale));
  --dur-book-bg: calc(760ms * var(--motion-scale));
}

:root[data-theme="dark"] {
  --paper: #171410;
  --paper-hi: #1f1b15;
  --paper-rail: #13110d;
  --paper-hover: rgba(240, 233, 213, 0.05);
  --ink: #f0e9d5;
  --ink-2: #c4bba6;
  --ink-3: #8a8473;
  --ink-4: #5a5448;
  --rule: rgba(240, 233, 213, 0.14);
  --rule-soft: rgba(240, 233, 213, 0.07);
  --accent: #e08766;
  --btn-ink: #f0e9d5;
  --btn-ink-text: #171410;
  --dev-text: #807960;
  --book-page: #f4eddc;
  --book-page-edge: #d8ceb7;
  --book-ink: #15140f;
  --book-ink-2: #3b362c;
  --book-ink-3: #776f5e;
  --book-outline: rgba(240, 233, 213, 0.72);
  --book-outline-glow: rgba(240, 233, 213, 0.16);
}

:root[data-text-size="S"] {
  font-size: 14px;
}

:root[data-text-size="L"] {
  font-size: 18.5px;
}

:root[data-motion="reduced"] {
  --motion-scale: 0;
}

:root[data-motion="reduced"] * {
  transition-duration: 0ms !important;
  animation-duration: 0ms !important;
  animation-iteration-count: 1 !important;
}

body[data-page="teaching-home"],
body[data-page="teaching"],
body[data-page="course"] {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  transition: background-color 200ms ease, color 200ms ease;
}

body[data-page="teaching-home"] *,
body[data-page="teaching"] *,
body[data-page="course"] * {
  box-sizing: border-box;
}

body[data-page="teaching-home"] a,
body[data-page="teaching-home"] button,
body[data-page="teaching"] a,
body[data-page="teaching"] button,
body[data-page="course"] a,
body[data-page="course"] button {
  font: inherit;
}

:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  transform: translateY(-160%);
  padding: 10px 14px;
  background: var(--btn-ink);
  color: var(--btn-ink-text);
  font-family: var(--font-sans);
  font-size: var(--t-body-3);
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.rh-dev-label {
  color: var(--dev-text);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  text-transform: none;
}

.rh-settings-trigger {
  min-width: 42px;
  min-height: 38px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--paper-hi);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1rem;
}

.rh-settings-trigger--welcome {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 30;
}

.rh-settings-popover {
  position: absolute;
  top: 54px;
  right: 18px;
  z-index: 31;
  width: min(320px, calc(100vw - 36px));
  padding: 14px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--paper-hi);
}

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

.rh-settings-controls,
.rh-settings-group,
.rh-pill-group {
  display: grid;
  gap: 8px;
}

.rh-settings-group + .rh-settings-group {
  margin-top: 14px;
}

.rh-settings-label {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-pill-group {
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
}

.rh-pill {
  min-height: 34px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  font-size: var(--t-body-3);
}

.rh-pill[aria-pressed="true"] {
  border-color: var(--btn-ink);
  background: var(--btn-ink);
  color: var(--btn-ink-text);
}

.rh-banner,
.rh-welcome-summary,
.rh-pullquote p,
.rh-course-hero h1,
.rh-ib-hero h1,
.rh-section-head h2,
.rh-course-row__title strong,
.rh-activity-row__body strong,
.rh-book__page strong,
.rh-mobile-book-card h2 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0;
}

.rh-welcome {
  position: relative;
  max-width: 1480px;
  min-height: 100vh;
  margin: 0 auto;
  padding: var(--space-12) var(--space-13);
  overflow-anchor: none;
}

.rh-banner {
  max-width: none;
  margin: 0 0 var(--space-7);
  color: var(--ink);
  font-size: clamp(48px, 8.4vw, var(--t-display-1));
  line-height: 0.92;
  text-align: center;
}

.rh-banner em {
  display: inline;
  font-style: italic;
  font-weight: 300;
}

.rh-welcome-summary {
  max-width: 760px;
  margin: 0 auto var(--space-10);
  color: var(--ink-2);
  font-size: var(--t-italic-1);
  font-style: italic;
  line-height: 1.45;
  text-align: center;
}

.rh-welcome-summary span {
  color: var(--ink);
}

.rh-welcome-bypass {
  display: flex;
  width: fit-content;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: calc(-1 * var(--space-6)) auto var(--space-10);
  padding: 9px 18px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper-hi);
  color: var(--ink-2);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.16);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
  line-height: 1;
  text-decoration: none;
}

.rh-welcome-bypass::after {
  content: "\2192";
  color: var(--ink-3);
  font-family: var(--font-sans);
  font-size: 0.9em;
  font-style: normal;
  transition: transform var(--dur-fast) ease, color var(--dur-fast) ease;
}

.rh-welcome-bypass:hover,
.rh-welcome-bypass:focus-visible {
  border-color: var(--ink);
  background: var(--paper-hover);
  color: var(--ink);
}

.rh-welcome-bypass:hover::after,
.rh-welcome-bypass:focus-visible::after {
  color: var(--ink);
  transform: translateX(3px);
}

.rh-bookshelf {
  position: relative;
}

.rh-shelf-stage {
  position: relative;
  height: 1000px;
  border-bottom: 0;
  overflow-anchor: none;
}

.rh-shelf-stage::before {
  content: "";
  position: absolute;
  top: 460px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--ink);
}

.rh-book {
  position: absolute;
  left: var(--closed-left, 0);
  top: var(--closed-top, 0);
  z-index: 1;
  width: var(--book-w);
  height: var(--book-h);
  padding: 0;
  border: 0;
  border-radius: 2px;
  background: var(--book-page);
  box-shadow: var(--shadow-book-spine);
  color: rgba(246, 241, 231, 0.92);
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  overflow-anchor: none;
  transform: translateZ(0);
  will-change: left, top, width, height, box-shadow;
  transition:
    left var(--dur-book-slide) var(--ease-open),
    top var(--dur-book-slide) var(--ease-open),
    width var(--dur-book-grow) var(--ease-open) 160ms,
    height var(--dur-book-grow) var(--ease-open) 160ms,
    box-shadow var(--dur-book-bg) var(--ease-soft);
}

body[data-page] .rh-book {
  transition:
    left var(--dur-book-slide) var(--ease-open),
    top var(--dur-book-slide) var(--ease-open),
    width var(--dur-book-grow) var(--ease-open) 160ms,
    height var(--dur-book-grow) var(--ease-open) 160ms,
    box-shadow var(--dur-book-bg) var(--ease-soft);
}

.rh-book::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: 2px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.08), transparent 18%, rgba(0, 0, 0, 0.1) 100%),
    var(--book-leather);
  opacity: 1;
  pointer-events: none;
  transition: opacity calc(180ms * var(--motion-scale)) ease;
}

body[data-page] .rh-book:focus-visible,
body[data-page] .rh-settings-trigger:focus-visible,
body[data-page] .rh-pill:focus-visible,
body[data-page] .rh-book-close:focus-visible,
body[data-page] .rh-secondary-button:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.rh-book[data-state="open"] {
  left: var(--open-left, 0);
  top: 516px;
  z-index: 20;
  width: 640px;
  height: 380px;
  box-shadow: var(--shadow-book-open);
}

.rh-book[data-state="open"],
.rh-book[data-phase="opening"] {
  border: 1px solid var(--book-outline);
  box-shadow:
    0 0 0 1px var(--book-outline-glow),
    var(--shadow-book-open);
}

.rh-book[data-state="open"]::after,
.rh-book[data-phase="opening"]::after {
  content: "";
  position: absolute;
  inset: 5px;
  z-index: 3;
  border: 0;
  border-radius: 1px;
  box-shadow: inset 0 0 0 0.5px rgba(21, 20, 15, 0.12);
  pointer-events: none;
}

:root[data-theme="dark"] .rh-book[data-state="open"]::after,
:root[data-theme="dark"] .rh-book[data-phase="opening"]::after {
  box-shadow:
    inset 0 0 0 0.5px rgba(21, 20, 15, 0.28),
    inset 0 0 0 1.25px rgba(255, 255, 255, 0.035),
    inset 0 0 14px rgba(21, 20, 15, 0.07);
}

.rh-book[data-state="open"]::before,
.rh-book[data-phase="opening"]::before {
  opacity: 0;
  transition: opacity calc(180ms * var(--motion-scale)) ease;
}

.rh-book[data-phase="closing"]::before {
  opacity: 1;
  transition: opacity calc(220ms * var(--motion-scale)) ease calc(360ms * var(--motion-scale));
}

.rh-book__spine,
.rh-book__pages {
  position: absolute;
  inset: 0;
}

.rh-book__spine {
  z-index: 2;
  opacity: 1;
  transition: opacity calc(180ms * var(--motion-scale)) ease;
}

.rh-book[data-state="open"] .rh-book__spine,
.rh-book[data-phase="opening"] .rh-book__spine {
  opacity: 0;
  transition: opacity calc(180ms * var(--motion-scale)) ease;
}

.rh-book[data-phase="closing"] .rh-book__spine {
  opacity: 1;
  transition: opacity calc(220ms * var(--motion-scale)) ease calc(360ms * var(--motion-scale));
}

.rh-book__band {
  position: absolute;
  left: 6px;
  right: 6px;
  pointer-events: none;
}

.rh-book__band--top-line,
.rh-book__band--bottom-line {
  height: 1px;
  background: rgba(255, 255, 255, 0.18);
}

.rh-book__band--top-bar,
.rh-book__band--bottom-bar {
  height: 5px;
  background: rgba(0, 0, 0, 0.18);
}

.rh-book__band--top-line { top: 14px; }
.rh-book__band--top-bar { top: 22px; }
.rh-book__band--bottom-line { bottom: 14px; }
.rh-book__band--bottom-bar { bottom: 22px; }

.rh-book__spine-title {
  position: absolute;
  inset: 32px 0;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1.15;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.rh-book__pages {
  display: grid;
  grid-template-columns: 1fr 1fr;
  z-index: 1;
  opacity: 0;
  visibility: hidden;
  color: var(--book-ink);
  text-align: left;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.38), transparent 18%, transparent 82%, rgba(21, 20, 15, 0.035)),
    var(--book-page);
  transition:
    opacity calc(320ms * var(--motion-scale)) ease calc(560ms * var(--motion-scale)),
    visibility 0ms linear calc(900ms * var(--motion-scale));
}

.rh-book[data-state="open"] .rh-book__pages,
.rh-book[data-phase="opening"] .rh-book__pages {
  opacity: 1;
  visibility: visible;
  transition:
    opacity calc(320ms * var(--motion-scale)) ease calc(560ms * var(--motion-scale)),
    visibility 0ms linear 0ms;
}

.rh-book[data-phase="closing"] .rh-book__pages {
  opacity: 0;
  visibility: visible;
  transition:
    opacity calc(200ms * var(--motion-scale)) ease,
    visibility 0ms linear calc(220ms * var(--motion-scale));
}

.rh-book__binding {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 30px;
  transform: translateX(-50%);
  background:
    linear-gradient(to right, transparent, rgba(21, 20, 15, 0.045) 28%, rgba(21, 20, 15, 0.13) 50%, rgba(21, 20, 15, 0.045) 72%, transparent);
  pointer-events: none;
}

.rh-book__page {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 34px 34px 30px;
}

.rh-book__page--left {
  padding-right: 40px;
  background:
    linear-gradient(90deg, rgba(21, 20, 15, 0.045), transparent 18%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.32), transparent 38%);
}

.rh-book__page--right {
  padding-left: 40px;
  background: linear-gradient(270deg, rgba(21, 20, 15, 0.035), transparent 16%);
}

.rh-book__level,
.rh-book__inside {
  color: var(--book-ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-2);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.rh-book__page--left strong {
  max-width: 10.5ch;
  margin-top: 20px;
  color: var(--course-accent);
  font-size: 1.95rem;
  line-height: 1.03;
  text-wrap: balance;
}

.rh-book__page--left em {
  margin-top: 22px;
  color: var(--book-ink-2);
  font-family: var(--font-display);
  font-size: 1rem;
  font-style: italic;
  line-height: 1.62;
}

.rh-topic-list {
  display: grid;
  gap: 10px;
}

.rh-book__inside {
  margin-bottom: 16px;
}

.rh-topic-list span {
  position: relative;
  padding-left: 20px;
  color: var(--book-ink-2);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  line-height: 1.5;
}

.rh-topic-list span::before {
  content: "";
  position: absolute;
  top: 0.78em;
  left: 0;
  width: 10px;
  height: 1px;
  background: var(--book-ink);
  opacity: 0.76;
}

.rh-book__enter,
.rh-primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 44px;
  margin-top: auto;
  padding: 12px 14px;
  border: 0;
  border-radius: 2px;
  background: var(--course-accent, var(--btn-ink));
  color: #fbf8f1;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
  line-height: 1.1;
  text-decoration: none;
}

.rh-book-close {
  position: absolute;
  top: 910px;
  left: 50%;
  z-index: 21;
  transform: translateX(-50%);
  padding: 6px 16px;
  border: 0;
  background: transparent;
  color: var(--ink-3);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 34px;
  opacity: 0;
  pointer-events: none;
  transition: opacity calc(380ms * var(--motion-scale)) ease calc(860ms * var(--motion-scale)), color var(--dur-fast) ease;
}

.rh-shelf-stage.has-open-book .rh-book-close {
  opacity: 1;
  pointer-events: auto;
}

.rh-book-close:hover {
  color: var(--ink);
}

.rh-mobile-books {
  display: none;
}

.rh-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
  background: var(--paper);
}

.rh-rail {
  position: sticky;
  top: 0;
  align-self: start;
  display: flex;
  flex-direction: column;
  width: 280px;
  height: 100vh;
  padding: 28px 22px;
  border-right: 1px solid var(--rule);
  background: var(--paper-rail);
  overflow-y: auto;
}

.rh-rail-brand {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  text-decoration: none;
}

.rh-rail-brand__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--ink);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
}

.rh-rail-brand strong,
.rh-rail-brand em {
  display: block;
}

.rh-rail-brand strong {
  font-weight: 500;
}

.rh-rail-brand em {
  color: var(--ink-3);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
}

.rh-rail-section {
  margin-bottom: 28px;
}

.rh-rail-section h2,
.rh-rail-footer h2 {
  margin: 0 0 10px;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-rail-stack {
  display: grid;
  gap: 4px;
}

.rh-rail-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  min-height: 34px;
  padding: 7px 8px;
  border-radius: 3px;
  color: var(--ink-2);
  font-size: var(--t-body-3);
  text-decoration: none;
}

.rh-rail-link:hover,
.rh-rail-link.is-active,
.rh-rail-link.is-ib-active {
  background: var(--paper);
  color: var(--ink);
}

.rh-rail-link.is-active,
.rh-rail-link.is-ib-active {
  box-shadow: inset 2px 0 0 var(--ink);
}

.rh-rail-link.is-muted {
  opacity: 0.55;
}

.rh-rail-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--course-accent, var(--accent));
}

.rh-rail-hint {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-2);
}

.rh-rail-theme {
  margin: 14px 0 6px;
  color: var(--ink-3);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
}

.rh-rail-link--unit {
  padding-left: 18px;
}

.rh-rail-footer {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.rh-mobile-bar {
  display: none;
}

.rh-main {
  min-width: 0;
  background: var(--paper);
}

.rh-landing-hero,
.rh-course-hero,
.rh-ib-hero {
  padding: 72px 56px 48px;
  border-bottom: 1px solid var(--ink);
}

.rh-landing-hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  align-items: start;
}

.rh-landing-hero h1 {
  max-width: 780px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(4rem, 8vw, var(--t-display-1));
  line-height: 0.94;
}

.rh-course-hero h1 {
  max-width: 720px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(3.55rem, 5.25vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.rh-landing-hero p,
.rh-course-hero__grid > p,
.rh-ib-hero p {
  max-width: 480px;
  margin: 16px 0 0;
  color: var(--ink-2);
  font-size: var(--t-body-1);
  line-height: 1.6;
}

.rh-pullquote {
  padding-left: 36px;
  border-left: 1px solid var(--ink);
}

.rh-pullquote p {
  margin: 0;
  color: var(--ink);
  font-size: var(--t-italic-1);
  font-style: italic;
  line-height: 1.45;
}

.rh-pullquote span {
  display: block;
  margin-top: 18px;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-directory,
.rh-activity-section,
.rh-ib-curriculum {
  padding: 40px 56px 0;
}

.rh-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.rh-section-head h2 {
  margin: 0;
  color: var(--ink);
  font-size: var(--t-display-5);
  line-height: 1.08;
}

.rh-section-head__hint {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-course-list,
.rh-activity-list {
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.rh-course-row {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 1.8fr 80px;
  gap: 24px;
  align-items: center;
  min-height: 112px;
  padding: 26px 28px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink);
  text-decoration: none;
  transition: background-color var(--dur-fast) ease;
}

.rh-course-row:last-child,
.rh-activity-row:last-child {
  border-bottom: 0;
}

.rh-row-bar {
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--course-accent, var(--theme-accent));
  opacity: 0;
  transition: opacity var(--dur-fast) ease;
}

.rh-course-row:hover,
.rh-course-row:focus-visible {
  background: var(--course-tint);
}

.rh-course-row:hover .rh-row-bar,
.rh-course-row:focus-visible .rh-row-bar {
  opacity: 1;
}

.rh-course-row:focus-visible,
.rh-activity-row:focus-visible,
.rh-ib-unit:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--ink);
}

.rh-course-row__title {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.rh-course-marker {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--course-accent, var(--theme-accent));
  flex: 0 0 auto;
}

.rh-course-row__title strong {
  display: block;
  color: var(--ink);
  font-size: var(--t-display-4);
  line-height: 1.1;
}

.rh-course-row__title em {
  display: block;
  margin-top: 4px;
  color: var(--ink-3);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
  line-height: 1.4;
}

.rh-course-row__summary {
  color: var(--ink-2);
  font-size: var(--t-body-2);
  line-height: 1.55;
}

.rh-course-row__chevron {
  color: var(--course-accent);
  font-family: var(--font-display);
  font-size: 60px;
  font-weight: 300;
  line-height: 1;
  opacity: 0;
  transition: opacity var(--dur-fast) ease;
}

.rh-course-row:hover .rh-course-row__title strong,
.rh-course-row:focus-visible .rh-course-row__title strong,
.rh-activity-row:hover strong,
.rh-activity-row:focus-visible strong,
.rh-ib-unit:hover strong,
.rh-ib-unit:focus-visible strong {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.rh-course-row:hover .rh-course-row__chevron,
.rh-course-row:focus-visible .rh-course-row__chevron {
  opacity: 1;
  animation: studio-arrow-bob 1.4s ease-in-out infinite;
}

@keyframes studio-arrow-bob {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(8px); }
}

.rh-course-row.is-development {
  opacity: 0.55;
}

.rh-breadcrumb {
  padding: 18px 56px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-style: italic;
}

.rh-breadcrumb a {
  color: var(--ink-3);
  text-decoration: none;
}

.rh-breadcrumb span {
  margin-left: 8px;
}

.rh-breadcrumb span + span {
  color: var(--ink);
}

.rh-course-hero {
  padding: 42px 56px 34px;
}

.rh-course-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.9fr);
  gap: 42px;
  align-items: center;
}

.rh-course-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-course-kicker .rh-course-marker {
  width: 18px;
  height: 18px;
}

.rh-stat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 700px;
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1px solid var(--ink);
}

.rh-stat-strip div {
  padding-right: 12px;
}

.rh-stat-strip div + div {
  padding-left: 12px;
  border-left: 1px solid var(--rule-soft);
}

.rh-stat-strip strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-7);
  font-weight: 400;
  line-height: 1.1;
}

.rh-stat-strip span {
  display: block;
  margin-top: 5px;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-activity-section {
  margin-bottom: 36px;
}

.rh-activity-row {
  display: grid;
  grid-template-columns: 1fr 240px 130px 40px;
  gap: 24px;
  align-items: center;
  padding: 22px 22px 22px 28px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink);
  text-decoration: none;
  transition: background-color var(--dur-fast) ease;
}

.rh-activity-row:hover,
.rh-activity-row:focus-visible {
  background: var(--paper-hover);
}

.rh-activity-row__body {
  display: grid;
  gap: 6px;
}

.rh-activity-row__body strong {
  color: var(--course-accent);
  font-size: var(--t-display-6);
  line-height: 1.15;
}

.rh-activity-row__body span {
  max-width: 580px;
  color: var(--ink-2);
  font-size: var(--t-body-3);
  line-height: 1.55;
}

.rh-activity-row__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.rh-tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 9px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-2);
  font-size: var(--t-tag);
  line-height: 1;
}

.rh-activity-row__format {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
}

.rh-activity-row__chevron {
  color: var(--course-accent);
  font-family: var(--font-display);
  font-size: 20px;
  font-style: italic;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--dur-fast) ease, transform var(--dur-fast) ease;
}

.rh-activity-row:hover .rh-activity-row__chevron,
.rh-activity-row:focus-visible .rh-activity-row__chevron {
  opacity: 1;
  transform: translateX(0);
}

.rh-course-empty {
  max-width: 680px;
  padding: 56px;
}

.rh-course-empty h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--t-display-5);
  font-weight: 400;
}

.rh-course-empty p {
  color: var(--ink-2);
  line-height: 1.6;
}

.rh-ib-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  min-height: calc(100vh - 58px);
}

.rh-ib-hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 42px;
  align-items: center;
  padding-top: 46px;
  padding-bottom: 38px;
}

.rh-ib-hero h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(3.35rem, 5vw, 4.75rem);
  line-height: 0.98;
  letter-spacing: -0.025em;
}

.rh-ib-hero h1 em {
  font-style: italic;
  font-weight: 300;
}

.rh-ib-hero .rh-stat-strip {
  margin-top: 20px;
}

.rh-ib-theme {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 36px;
  padding: 24px 0 26px;
  border-top: 1px solid var(--ink);
}

.rh-ib-theme + .rh-ib-theme {
  border-top-color: var(--rule-soft);
}

.rh-ib-theme__meta p {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-ib-theme__meta h3 {
  margin: 10px 0 8px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-5);
  font-weight: 400;
  line-height: 1.1;
}

.rh-ib-theme__meta > span {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-ib-unit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.rh-ib-unit {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 14px 16px 16px;
  border-radius: 3px;
  background: var(--theme-soft);
  color: var(--ink);
  text-decoration: none;
  transition: background-color var(--dur-fast) ease;
}

.rh-ib-unit .rh-row-bar {
  opacity: 0.7;
}

.rh-ib-unit:hover,
.rh-ib-unit:focus-visible,
.rh-ib-unit.is-active {
  background: var(--theme-tint);
}

.rh-ib-unit.is-active .rh-row-bar {
  opacity: 1;
}

.rh-ib-unit.is-development {
  opacity: 0.55;
  background: transparent;
}

.rh-ib-unit.is-development .rh-row-bar {
  opacity: 0;
}

.rh-ib-unit__code,
.rh-ib-unit__meta {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-ib-unit strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-7);
  font-weight: 400;
  line-height: 1.1;
}

.rh-ib-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  padding: 32px 56px 48px;
}

.rh-component-list,
.rh-assessment-list {
  border-top: 1px solid var(--ink);
}

.rh-component-row,
.rh-assessment-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.rh-component-row.is-development {
  opacity: 0.55;
}

.rh-component-row strong,
.rh-assessment-row strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-7);
  font-weight: 400;
}

.rh-component-row > em,
.rh-assessment-row > span:last-child strong {
  font-size: var(--t-display-6);
  font-style: normal;
}

.rh-assessment-row em {
  display: block;
  max-width: 340px;
  margin-top: 5px;
  color: var(--ink-3);
  font-size: var(--t-body-3);
  font-style: normal;
  line-height: 1.55;
}

.rh-inspector {
  position: sticky;
  top: 0;
  align-self: start;
  min-height: 100vh;
  padding: 32px 24px;
  border-left: 1px solid var(--rule);
  background: var(--paper-rail);
}

.rh-inspector-label,
.rh-covers p {
  margin: 0 0 12px;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-inspector-title span {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-4);
}

.rh-inspector-title i {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #16a34a;
}

.rh-inspector-title strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-5);
  font-weight: 400;
  line-height: 1.1;
}

.rh-inspector-lead {
  margin: 18px 0;
  color: var(--ink-3);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
  line-height: 1.5;
}

.rh-key-list {
  margin: 0 0 24px;
  padding: 16px 0 0;
  border-top: 1px solid var(--rule);
}

.rh-key-list div {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.rh-key-list dt {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: var(--t-meta-2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rh-key-list dd {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
}

.rh-covers {
  margin-top: 22px;
}

.rh-covers span {
  display: block;
  padding: 10px 0;
  border-top: 1px solid var(--rule-soft);
  color: var(--ink-2);
  font-size: var(--t-body-4);
  line-height: 1.55;
}

.rh-inspector-actions {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.rh-primary-button {
  background: var(--btn-ink);
  color: var(--btn-ink-text);
}

.rh-secondary-button {
  min-height: 44px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: var(--t-body-3);
}

.rh-coming-soon {
  margin: 24px 0;
  padding: 32px 22px;
  border: 1px dashed var(--rule);
  border-radius: 4px;
  text-align: center;
}

.rh-coming-soon strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-7);
  font-style: italic;
  font-weight: 300;
}

.rh-coming-soon span {
  display: block;
  margin-top: 10px;
  color: var(--ink-3);
  font-size: var(--t-body-4);
  line-height: 1.55;
}

/* Compact IB hub: unit cards carry their own summary, details, and direct links. */
.rh-ib-layout {
  display: block;
  min-height: auto;
}

.rh-ib-unit-grid {
  gap: 10px;
  align-items: start;
}

.rh-ib-unit {
  position: relative;
  display: grid;
  grid-template-rows: auto auto auto;
  align-content: start;
  align-items: start;
  align-self: start;
  gap: 0;
  padding: 0;
  overflow: hidden;
  background: var(--theme-soft);
  transition: none;
}

.rh-ib-unit .rh-row-bar {
  opacity: 0.75;
}

.rh-ib-unit:hover,
.rh-ib-unit:focus-visible,
.rh-ib-unit.is-active {
  background: var(--theme-soft);
}

.rh-ib-unit.is-development {
  opacity: 0.58;
  background: transparent;
}

.rh-ib-unit.is-development .rh-row-bar {
  opacity: 0;
}

.rh-ib-unit-main {
  position: relative;
  display: grid;
  align-content: start;
  align-items: start;
  align-self: start;
  gap: 8px;
  width: 100%;
  padding: 15px 18px 14px;
  color: inherit;
  text-decoration: none;
}

a.rh-ib-unit-main:hover,
a.rh-ib-unit-main:focus-visible {
  background: var(--theme-tint);
}

a.rh-ib-unit-main:hover .rh-ib-unit__title,
a.rh-ib-unit-main:focus-visible .rh-ib-unit__title {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.rh-ib-unit:hover .rh-ib-unit__title,
.rh-ib-unit:focus-visible .rh-ib-unit__title {
  text-decoration: none;
}

.rh-ib-unit:has(a.rh-ib-unit-main:hover) .rh-ib-unit__title,
.rh-ib-unit:has(a.rh-ib-unit-main:focus-visible) .rh-ib-unit__title {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.rh-ib-unit-main:focus-visible,
.rh-ib-details-toggle:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--ink);
}

.rh-ib-unit__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.rh-ib-unit__title {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--t-display-7);
  font-weight: 400;
  line-height: 1.12;
}

.rh-ib-unit__summary {
  max-width: 45rem;
  color: var(--ink-2);
  font-size: var(--t-body-3);
  line-height: 1.55;
}

.rh-ib-unit__action {
  color: var(--theme-accent);
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
}

.rh-ib-unit.is-development .rh-ib-unit__action {
  color: var(--dev-text);
}

.rh-ib-details-toggle {
  position: relative;
  align-self: start;
  justify-self: start;
  margin: 0 18px 16px;
  padding: 5px 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--ink-3);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: var(--t-italic-3);
  font-style: italic;
}

.rh-ib-details {
  display: none;
  position: relative;
  align-self: start;
  margin: 0 18px 18px;
  padding-top: 14px;
  border-top: 1px solid var(--rule-soft);
}

.rh-ib-unit.is-expanded .rh-ib-details {
  display: grid;
  gap: 14px;
}

.rh-ib-coverage {
  display: grid;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--rule-soft);
}

.rh-ib-coverage span {
  position: relative;
  padding-left: 18px;
  color: var(--ink-2);
  font-size: var(--t-body-3);
  line-height: 1.5;
}

.rh-ib-coverage span::before {
  content: "";
  position: absolute;
  top: 0.78em;
  left: 0;
  width: 9px;
  height: 1px;
  background: var(--ink);
  opacity: 0.72;
}

@media (max-width: 1279px) {
  .rh-ib-layout {
    display: block;
  }

  .rh-inspector {
    position: static;
    min-height: 0;
    border-top: 1px solid var(--rule);
    border-left: 0;
  }
}

@media (max-width: 1023px) {
  .rh-welcome {
    padding: var(--space-10) var(--space-10);
  }

  .rh-shelf-stage {
    display: none;
  }

  .rh-mobile-books {
    display: grid;
    gap: 16px;
  }

  .rh-mobile-book-card {
    position: relative;
    display: grid;
    gap: 18px;
    padding: 24px;
    border: 1px solid var(--rule);
    border-radius: 4px;
    background: var(--paper-hi);
    overflow: hidden;
  }

  .rh-mobile-book-card::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 3px;
    background: var(--course-accent);
  }

  .rh-mobile-book-card__head {
    display: grid;
    gap: 8px;
  }

  .rh-mobile-book-card__head span {
    color: var(--ink-3);
    font-family: var(--font-mono);
    font-size: var(--t-meta-2);
    letter-spacing: 0.16em;
    text-transform: uppercase;
  }

  .rh-mobile-book-card h2 {
    margin: 0;
    color: var(--course-accent);
    font-size: var(--t-display-7);
  }

  .rh-mobile-book-card p {
    margin: 0;
    color: var(--ink-2);
    font-family: var(--font-display);
    font-size: var(--t-italic-3);
    font-style: italic;
    line-height: 1.5;
  }

  .rh-mobile-book-card__topics strong {
    display: block;
    margin-bottom: 10px;
    color: var(--ink-3);
    font-family: var(--font-mono);
    font-size: var(--t-meta-2);
    letter-spacing: 0.16em;
    text-transform: uppercase;
  }

  .rh-shell {
    display: block;
    padding-top: 60px;
  }

  .rh-rail {
    display: none;
  }

  .rh-mobile-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0 24px;
    border-bottom: 1px solid var(--rule);
    background: var(--paper-rail);
  }

  .rh-mobile-brand {
    color: var(--ink);
    font-weight: 500;
    text-decoration: none;
  }

  .rh-landing-hero,
  .rh-course-hero,
  .rh-ib-hero {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 48px 32px 36px;
  }

  .rh-landing-hero h1 {
    font-size: clamp(3.2rem, 12vw, 5rem);
  }

  .rh-course-hero h1 {
    font-size: clamp(2.9rem, 10vw, 4.25rem);
  }

  .rh-ib-hero h1 {
    font-size: clamp(2.9rem, 10vw, 4.25rem);
  }

  .rh-directory,
  .rh-activity-section,
  .rh-ib-curriculum {
    padding: 32px 32px 0;
  }

  .rh-course-row {
    grid-template-columns: 1fr auto;
    gap: 12px;
    padding: 20px 24px;
  }

  .rh-course-row__summary {
    grid-column: 1 / -1;
  }

  .rh-course-row__chevron {
    font-size: 44px;
  }

  .rh-course-hero__grid,
  .rh-ib-hero {
    grid-template-columns: 1fr;
  }

  .rh-activity-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .rh-activity-row__chevron {
    display: none;
  }

  .rh-activity-row__format {
    order: 3;
  }

  .rh-ib-theme {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .rh-ib-bottom {
    grid-template-columns: 1fr;
    padding: 32px;
  }
}

@media (max-width: 767px) {
  .rh-welcome {
    padding: 56px 24px;
  }

  .rh-welcome-summary {
    font-size: 1.25rem;
  }

  .rh-pullquote {
    padding-left: 20px;
  }

  .rh-stat-strip,
  .rh-ib-unit-grid {
    grid-template-columns: 1fr;
  }

  .rh-stat-strip div + div {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 480px) {
  .rh-mobile-bar {
    padding: 0 16px;
  }

  .rh-landing-hero,
  .rh-course-hero,
  .rh-ib-hero,
  .rh-directory,
  .rh-activity-section,
  .rh-ib-curriculum,
  .rh-ib-bottom,
  .rh-inspector {
    padding-left: 20px;
    padding-right: 20px;
  }

  .rh-course-row__title em {
    display: none;
  }

  .rh-course-row__chevron {
    font-size: 36px;
  }
}