:root {
  --fn-gold: #d6a441;
  --fn-gold-bright: #efc65f;
  --fn-ink: #080808;
  --fn-panel: #101010;
  --fn-text: #f5f1e8;
  --fn-muted: #f5f5f5;
  --fn-line: rgba(214, 164, 65, .3);
}

.music-theory-main {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
  background: var(--fn-ink);
}

.lesson-hero-media {
  position: relative;
  display: flex;
  min-height: clamp(520px, 68vh, 760px);
  overflow: hidden;
  border-bottom: 1px solid rgba(214, 164, 65, .68);
  isolation: isolate;
}

.lesson-hero-media__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% center;
  filter: grayscale(.12) contrast(1.12) brightness(.68);
  transform: scale(1.02);
}

.lesson-hero-media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, .97), rgba(0, 0, 0, .84) 42%, rgba(0, 0, 0, .3) 76%, rgba(0, 0, 0, .16)),
    linear-gradient(180deg, rgba(0, 0, 0, .08), rgba(0, 0, 0, .72));
}

.lesson-hero-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  z-index: 2;
  height: 34%;
  background: linear-gradient(transparent, rgba(0, 0, 0, .8));
}

.lesson-hero-overlay {
  position: relative;
  z-index: 3;
  display: flex;
  width: min(1440px, 100%);
  margin: 0 auto;
  align-items: center;
  padding: clamp(3rem, 8vw, 7rem);
}

.lesson-hero-overlay__content {
  width: min(820px, 70vw);
}

.lesson-hero-overlay__kicker {
  display: inline-flex;
  margin: 0 0 1.25rem !important;
  padding: .42rem .75rem;
  border: 1px solid rgba(214, 164, 65, .58);
  border-radius: 999px;
  color: var(--fn-gold);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .16em;
  line-height: 1.2;
  text-transform: uppercase;
}

.lesson-hero-overlay__content h1 {
  max-width: 12ch;
  margin: 0;
  color: var(--fn-text);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(3.4rem, 7vw, 7rem);
  font-weight: 500;
  letter-spacing: -.045em;
  line-height: .9;
  text-shadow: 0 6px 30px rgba(0, 0, 0, .74);
}

.lesson-hero-overlay__content h1::after {
  content: "";
  display: block;
  width: 82px;
  height: 3px;
  margin: 1.35rem 0 1.2rem;
  background: var(--fn-gold);
}

.lesson-hero-overlay__content > p:not(.lesson-hero-overlay__kicker) {
  max-width: 62ch;
  margin: 0;
  color: rgba(255, 255, 255, .78);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.65;
}

.lesson-content-wrap {
  position: relative;
  display: block;
  width: 100%;
  margin: 0;
  padding: clamp(4rem, 7vw, 6.5rem) 1rem 0;
  background:
    linear-gradient(rgba(8, 8, 8, .92), rgba(8, 8, 8, .97)),
    url("../images/backgrounds/blackhex.webp") center top / 1500px auto repeat-y;
}

.lesson-content-wrap::before {
  content: "Foundations lesson";
  display: block;
  width: min(920px, 100%);
  margin: 0 auto 1rem;
  color: var(--fn-gold);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.lesson-section {
  position: relative;
  width: min(920px, 100%);
  margin: 0 auto;
  padding: 0 0 clamp(4.5rem, 7vw, 6rem);
  border: 0;
  background: transparent;
  overflow: visible;
}

.lesson-section + .lesson-section {
  padding-top: clamp(3.5rem, 6vw, 5rem);
  border-top: 1px solid var(--fn-line);
}

.lesson-section::before,
.lesson-section::after {
  content: none;
}

.lesson-section > h2:first-child {
  max-width: 16ch;
  margin: 0 0 clamp(2rem, 4vw, 3rem);
  color: var(--fn-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(2.6rem, 5vw, 4.7rem);
  font-weight: 500;
  letter-spacing: -.035em;
  line-height: .96;
}

.lesson-section > h2:first-child::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin-top: 1rem;
  background: var(--fn-gold);
}

.lesson-section h3 {
  margin: 2.25rem 0 .65rem;
  color: var(--fn-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  font-weight: 500;
  letter-spacing: -.01em;
}

.lesson-section p,
.lesson-section ul {
  max-width: 76ch;
  color: var(--fn-muted);
  font-size: clamp(.98rem, 1.1vw, 1.06rem);
  line-height: 1.75;
  text-align: left;
}

.lesson-section p {
  margin: .5rem 0 0;
}

.lesson-section p + p {
  margin-top: .8rem;
}

.lesson-section ul {
  margin: .8rem 0 0;
  padding-left: 1.25rem;
}

.lesson-section li {
  margin: .3rem 0;
  text-align: left;
}

.lesson-section li::marker {
  color: var(--fn-gold);
}

.lesson-section strong {
  color: var(--fn-text);
  font-weight: 650;
}

/* Give the final practice prompt room to read as its own, calmer section. */
#bringing-it-all-together > h2:not(:first-child) {
  margin: clamp(3.25rem, 6vw, 4.75rem) 0 1rem;
  padding-top: .25rem;
  color: var(--fn-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(1.8rem, 3vw, 2.55rem);
  font-weight: 500;
  letter-spacing: -.025em;
  line-height: 1.05;
}

#bringing-it-all-together > h2:not(:first-child) + p {
  margin-top: 0;
}

#bringing-it-all-together .theory-foundations-actions {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  padding-bottom: clamp(2.75rem, 5vw, 4rem);
}

.lesson-inline-link,
.lesson-def-link {
  color: var(--fn-gold-bright);
  font-weight: 700;
  text-decoration-color: rgba(214, 164, 65, .48);
  text-underline-offset: .18em;
}

.lesson-inline-link:hover,
.lesson-inline-link:focus-visible,
.lesson-def-link:hover,
.lesson-def-link:focus-visible {
  color: #fff0b8;
}

.lesson-image-figure {
  width: min(860px, 100%);
  margin: 1.6rem 0 2rem;
  overflow: visible;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.lesson-image-figure--fretboard {
  width: min(920px, 100%);
}

.lesson-image {
  display: block;
  width: 100%;
  height: auto;
}

.lesson-section .tab-tool {
  width: min(920px, 100%);
  max-width: none;
  margin: 1.4rem 0 2rem;
}

.lesson-section .tab-tool__card {
  padding: clamp(1rem, 2.4vw, 1.6rem);
  border: 1px solid var(--fn-line);
  border-radius: 8px;
  background: #0e0e0e;
  box-shadow: 0 22px 52px rgba(0, 0, 0, .3);
}

.lesson-section .tab-tool__eyebrow {
  margin: 0 0 .25rem;
  color: var(--fn-gold);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.lesson-section .tab-tool__card > h3 {
  margin: 0 0 1rem;
  color: var(--fn-text);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}

.lesson-section .tab-tool__controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1rem;
}

.lesson-section .tab-tool__tempo {
  width: auto !important;
}

.lesson-section .tab-tool__meta {
  max-width: none;
  margin: 0;
  color: rgba(245, 241, 232, .66);
  font-size: .82rem;
  line-height: 1.4;
  white-space: nowrap;
}

.lesson-section .tab-tool__transport {
  margin-left: auto;
}

.tab-current-note {
  display: grid;
  justify-items: center;
  gap: .15rem;
  margin: .35rem 0 1rem;
  padding: .8rem 1rem;
  border-block: 1px solid rgba(214, 164, 65, .28);
  background: rgba(214, 164, 65, .055);
  text-align: center;
}

.tab-current-note__label {
  color: rgba(245, 241, 232, .68);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.tab-current-note__value {
  color: var(--fn-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 600;
  line-height: .95;
  text-shadow: 0 0 22px rgba(214, 164, 65, .28);
}

/* Compact transport used by all four exercises on this lesson. */
.lesson-section .tab-tool[data-compact-transport] .tab-position__controls--transport {
  display: grid;
  grid-template-columns: auto auto minmax(140px, 1fr) auto auto auto auto;
  align-items: center;
  gap: .65rem;
  width: 100%;
  min-width: 0;
}

.lesson-section .tab-tool[data-compact-transport] > .tab-tool__card > .tab-tool__controls {
  display: none;
}

.lesson-section .tab-tool[data-compact-transport] .tab-tool__card {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__head {
  display: block;
  margin-bottom: .85rem;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__title {
  margin: 0 0 .75rem;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn {
  width: auto;
  min-width: 0;
  height: 32px;
  padding: 0 .8rem;
  border-radius: 4px;
  white-space: nowrap;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn--play::before {
  content: "\25B6";
  margin-right: .42rem;
  font-size: .68em;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="stop"] {
  font-size: 0;
  min-width: 32px;
  padding-inline: .55rem;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="stop"]::before {
  content: "\25A0";
  font-size: .72rem;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__progress {
  position: relative;
  display: block;
  min-width: 90px;
  height: 18px;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__progress::before {
  content: "";
  position: absolute;
  top: 50%;
  right: 0;
  left: 0;
  height: 2px;
  background: rgba(245, 241, 232, .3);
  transform: translateY(-50%);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__progress::after {
  content: "";
  position: absolute;
  top: 50%;
  left: var(--progress, 0%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--fn-gold-bright);
  box-shadow: 0 0 8px rgba(214, 164, 65, .42);
  transform: translate(-50%, -50%);
  transition: left .12s linear;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__time,
.lesson-section .tab-tool[data-compact-transport] .tab-position__bpm {
  color: rgba(245, 241, 232, .78);
  font-size: .82rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__bpm::before {
  content: "\2669";
  margin-right: .32rem;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn.is-active {
  color: #171109;
  background: var(--fn-gold);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__status {
  display: none;
}

/* One deliberate transport bar; no duplicate controls or card-like button grid. */
.lesson-section .tab-tool[data-compact-transport] .tab-position {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.lesson-section .tab-tool[data-compact-transport][data-target-note-modules] .tab-position {
  padding: 1rem 1.1rem;
  border: 1px solid rgba(214, 164, 65, .38);
  border-radius: 8px;
  background: rgba(8, 8, 8, .78);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__controls--transport {
  grid-template-columns: 52px 42px minmax(110px, 1fr) 118px 146px 72px 104px;
  min-height: 82px;
  padding: .75rem 1rem;
  border-top: 1px solid rgba(214, 164, 65, .26);
  border-bottom: 1px solid rgba(214, 164, 65, .26);
  background: rgba(0, 0, 0, .18);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn,
.lesson-section .tab-tool[data-compact-transport] .transport-tempo__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  min-width: 0;
  margin: 0;
  border: 0;
  color: #f4cf79;
  background: transparent;
  box-shadow: none;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn--play {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
  color: #0d0b08;
  background: var(--fn-gold);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn--play::before,
.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="stop"]::before,
.lesson-section .tab-tool[data-compact-transport] .tab-position__bpm::before {
  content: none;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn--play .transport-control__label {
  display: none;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="stop"] {
  width: 38px;
  min-width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid rgba(245, 241, 232, .28);
  border-radius: 6px;
  font-size: inherit;
}

.lesson-section .tab-tool[data-compact-transport] .transport-control__icon,
.lesson-section .tab-tool[data-compact-transport] .transport-control__image,
.lesson-section .tab-tool[data-compact-transport] .transport-tempo__button svg,
.lesson-section .tab-tool[data-compact-transport] .transport-tempo__button img {
  width: 23px;
  height: 23px;
  fill: none;
  stroke: currentColor;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn--play .transport-control__icon,
.lesson-section .tab-tool[data-compact-transport] .tab-position__btn--play .transport-control__image,
.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="stop"] .transport-control__icon,
.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="stop"] .transport-control__image {
  width: 26px;
  height: 26px;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="loop"],
.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="metronome"] {
  display: grid;
  justify-items: center;
  align-content: center;
  gap: .15rem;
  height: 56px;
  padding: 0 .15rem;
  color: #f4cf79;
  font-size: .75rem;
  font-weight: 700;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="loop"] {
  border-left: 1px solid rgba(245, 241, 232, .2);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__btn.is-active {
  color: #fff0b8;
  background: transparent;
  text-shadow: 0 0 12px rgba(214, 164, 65, .55);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__progress {
  height: 22px;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__progress::before {
  height: 1px;
  background: rgba(245, 241, 232, .42);
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__progress::after {
  width: 16px;
  height: 16px;
  background: #efc25d;
}

.lesson-section .tab-tool[data-compact-transport] .tab-position__time {
  color: #f4e2b9;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .9rem;
  letter-spacing: .08em;
  padding-right: 1rem;
  border-right: 1px solid rgba(245, 241, 232, .18);
  text-align: right;
}

.lesson-section .tab-tool[data-compact-transport] .transport-tempo {
  display: grid;
  grid-template-columns: 38px 1fr 38px;
  align-items: center;
  height: 42px;
  border: 1px solid rgba(245, 241, 232, .24);
  border-radius: 6px;
}

.lesson-section .tab-tool[data-compact-transport] .transport-tempo__button {
  width: 38px;
  height: 40px;
  padding: 0;
}

.lesson-section .tab-tool[data-compact-transport] .transport-tempo__button + .transport-tempo__value,
.lesson-section .tab-tool[data-compact-transport] .transport-tempo__value + .transport-tempo__button {
  border-left: 1px solid rgba(245, 241, 232, .16);
}

.lesson-section .tab-tool[data-compact-transport] .transport-tempo__value {
  display: block;
  color: #f4e2b9;
  font-size: .92rem;
  font-weight: 700;
  text-align: center;
  white-space: nowrap;
}

@media (max-width: 760px) {
  .lesson-section .tab-tool[data-compact-transport] .tab-position__controls--transport {
    grid-template-columns: auto auto 1fr auto;
    gap: .45rem;
  }

  .lesson-section .tab-tool[data-compact-transport] .tab-position__progress {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .lesson-section .tab-tool[data-compact-transport] .tab-position__time {
    grid-column: 1 / 3;
  }

  .lesson-section .tab-tool[data-compact-transport] .tab-position__bpm {
    text-align: right;
  }

  .lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="loop"] {
    grid-column: 3;
  }

  .lesson-section .tab-tool[data-compact-transport] .tab-position__btn[data-position-action="metronome"] {
    grid-column: 4;
  }
}

.lesson-section .tab-grid {
  border-color: rgba(214, 164, 65, .24);
  border-radius: 5px;
}

/* Page-only compact layout: one clearly labelled module per target note. */
.lesson-section .tab-tool[data-target-note-modules] {
  width: min(920px, 100%);
}

/* Tall module stacks cannot satisfy the page reveal observer's 18% threshold. */
body.has-scroll-reveal .lesson-section > .tab-tool[data-target-note-modules] {
  opacity: 1 !important;
  transform: none !important;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-grid {
  grid-template-columns: minmax(0, 1fr);
  gap: 1.15rem;
  border: 0;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-position {
  min-width: 0;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(214, 164, 65, .38);
  border-radius: 8px;
  background: rgba(8, 8, 8, .78);
}

.lesson-section .tab-tool[data-target-note-modules] .tab-position__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: .65rem;
  margin-bottom: .75rem;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-position__title {
  padding-bottom: .55rem;
  border-bottom: 1px solid rgba(214, 164, 65, .26);
  color: var(--fn-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .035em;
  text-transform: none;
}

.lesson-section .tab-tool[data-target-note-modules]:not([data-compact-transport]) .tab-position__controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .45rem;
}

.lesson-section .tab-tool[data-target-note-modules]:not([data-compact-transport]) .tab-position__btn {
  width: 100%;
  min-width: 0;
  height: 34px;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-grid-pass {
  padding: .75rem 1rem .85rem;
  border-radius: 6px;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-grid-pass__title {
  margin-bottom: .35rem;
  color: rgba(245, 241, 232, .72);
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-string-row {
  grid-template-columns: 32px minmax(0, 1fr);
  min-height: 36px;
  gap: .65rem;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-string-track {
  height: 30px;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-fret-note {
  width: 28px;
  height: 28px;
  font-size: .8rem;
}

.lesson-section .tab-tool[data-target-note-modules] .tab-position__status {
  margin-top: .5rem;
  font-size: .76rem;
}

@media (max-width: 760px) {
  .lesson-section .tab-tool[data-target-note-modules] .tab-position {
    padding: .75rem .65rem;
  }

  .lesson-section .tab-tool[data-target-note-modules] .tab-grid-pass {
    padding-inline: .55rem;
  }

  .lesson-section .tab-tool[data-target-note-modules] .tab-string-row {
    grid-template-columns: 24px minmax(0, 1fr);
    gap: .35rem;
  }
}

.lesson-final-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
  width: min(680px, 100%);
  margin: 3rem 0 0;
}

.lesson-faq-disclosure {
  width: 100%;
  margin: clamp(3rem, 6vw, 5rem) 0 0;
  border-top: 1px solid var(--fn-line);
  border-bottom: 1px solid var(--fn-line);
}

.lesson-faq-disclosure > summary {
  position: relative;
  display: flex;
  min-height: 92px;
  align-items: center;
  padding: 1.25rem 4rem 1.25rem 0;
  color: var(--fn-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(1.8rem, 3.2vw, 2.7rem);
  font-weight: 500;
  letter-spacing: -.02em;
  line-height: 1.05;
  list-style: none;
  cursor: pointer;
}

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

.lesson-faq-disclosure > summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: .5rem;
  color: var(--fn-gold);
  font-family: sans-serif;
  font-size: 2rem;
  font-weight: 300;
  line-height: 1;
  transform: translateY(-50%);
}

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

.lesson-faq-disclosure > summary:hover,
.lesson-faq-disclosure > summary:focus-visible {
  color: #fff0b8;
  outline: none;
}

.lesson-faq-disclosure > .faq-accordion {
  margin-top: 0;
  margin-bottom: 2rem;
}

.lesson-final-actions .theory-hero__button,
.theory-foundations-actions .theory-hero__button {
  display: inline-flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: .7rem;
  padding: .75rem 1.25rem;
  border: 1px solid #9f792e;
  border-radius: 8px;
  color: #f7f3ea;
  background: rgba(5, 5, 5, .74);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .045em;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  transition: transform .2s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
}

.lesson-final-actions .theory-hero__button--primary,
.theory-foundations-actions .theory-hero__button--primary {
  color: #171109;
  border-color: #efd58c;
  background: var(--fn-gold);
}

.lesson-final-actions .theory-hero__button:hover,
.lesson-final-actions .theory-hero__button:focus-visible,
.theory-foundations-actions .theory-hero__button:hover,
.theory-foundations-actions .theory-hero__button:focus-visible {
  color: #171109;
  border-color: #f5dda0;
  background: #e0b65d;
  outline: none;
  transform: translateY(-3px);
}

.lesson-bottom-divider {
  display: none;
}

.theory-lesson-page .lesson-content-wrap > .lesson-content-visualizer {
  position: relative;
  inset: auto;
  z-index: 2;
  display: flex;
  width: 100vw;
  max-width: none;
  height: 62px;
  margin: 0 0 0 calc(50% - 50vw) !important;
  padding: 0 clamp(.7rem, 2.2vw, 2.2rem) !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: transparent !important;
  background-image: none !important;
  box-shadow: none !important;
}

.theory-lesson-page .lesson-content-wrap > .lesson-content-visualizer::before,
.theory-lesson-page .lesson-content-wrap > .lesson-content-visualizer::after {
  content: none !important;
  display: none !important;
  background: none !important;
}

.site-footer {
  margin-top: 0;
  padding: 0;
  border: 0;
  background: var(--fn-ink) !important;
}

.site-footer > .audio-visualizer {
  border: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 50;
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--fn-gold);
  border-radius: 50%;
  color: #171109;
  background: var(--fn-gold);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .2s ease, transform .2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

body.has-scroll-reveal .lesson-hero-overlay__kicker,
body.has-scroll-reveal .lesson-hero-overlay__content h1,
body.has-scroll-reveal .lesson-hero-overlay__content > p:not(.lesson-hero-overlay__kicker),
body.has-scroll-reveal .lesson-section > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .62s ease, transform .62s ease;
}

body.has-scroll-reveal .is-revealed {
  opacity: 1 !important;
  transform: none !important;
}

@media (max-width: 760px) {
  .lesson-hero-media {
    min-height: 620px;
  }

  .lesson-hero-media__bg {
    object-position: 70% center;
  }

  .lesson-hero-media::before {
    background: linear-gradient(180deg, rgba(0, 0, 0, .34), rgba(0, 0, 0, .95) 68%);
  }

  .lesson-hero-overlay {
    align-items: flex-end;
    padding: 2rem 1.15rem 3.5rem;
  }

  .lesson-hero-overlay__content {
    width: 100%;
  }

  .lesson-hero-overlay__content h1 {
    font-size: clamp(3rem, 14vw, 4.7rem);
  }

  .lesson-content-wrap {
    padding-top: 3.25rem;
  }

  .lesson-section {
    padding-bottom: 3.75rem;
  }

  .lesson-section + .lesson-section {
    padding-top: 3.25rem;
  }

  .lesson-section > h2:first-child {
    font-size: clamp(2.3rem, 11vw, 3.4rem);
  }

  .lesson-section .tab-tool__transport {
    width: 100%;
    margin-left: 0;
  }

  .lesson-section .tab-tool__meta {
    white-space: normal;
  }

  .lesson-final-actions {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}