:root {
  --kt-gold: #d6a441;
  --kt-gold-bright: #efc65f;
  --kt-ink: #080808;
  --kt-panel: #0e0e0e;
  --kt-paper: #f3efe6;
  --kt-muted: rgba(245, 241, 232, .72);
  --kt-line: rgba(214, 164, 65, .3);
}

.music-theory-main {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
  background: var(--kt-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(.7);
  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) 40%, rgba(0, 0, 0, .3) 74%, rgba(0, 0, 0, .16)),
    linear-gradient(180deg, rgba(0, 0, 0, .08), rgba(0, 0, 0, .68));
}

.lesson-hero-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  z-index: 2;
  height: 34%;
  background: linear-gradient(transparent, rgba(0, 0, 0, .78));
}

.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(780px, 68vw);
}

.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(--kt-gold);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .16em;
  line-height: 1.2;
  text-transform: uppercase;
}

.lesson-hero-overlay__content h1 {
  max-width: 10ch;
  margin: 0;
  color: #f5f1e8;
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(3.5rem, 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(--kt-gold);
}

.lesson-hero-overlay__content > p:not(.lesson-hero-overlay__kicker) {
  max-width: 62ch;
  margin: .55rem 0 0;
  color: rgba(255, 255, 255, .78);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.65;
}

.lesson-hero-overlay__content > p:last-child {
  color: var(--kt-gold-bright);
  font-weight: 600;
}

.lesson-sticky-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr);
  gap: 1rem;
  width: 100%;
  margin: 0;
  padding: .8rem clamp(1rem, 5vw, 4rem);
  border: 0;
  border-bottom: 1px solid var(--kt-line);
  border-radius: 0;
  background: rgba(8, 8, 8, .96);
  box-shadow: 0 12px 28px rgba(0, 0, 0, .32);
  backdrop-filter: blur(12px);
}

.lesson-sticky-nav__links {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: .25rem;
}

.lesson-sticky-nav__links a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: .5rem .72rem;
  border: 0;
  border-radius: 0;
  color: rgba(255, 255, 255, .64);
  font-size: .77rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.lesson-sticky-nav__links a:hover,
.lesson-sticky-nav__links a:focus-visible,
.lesson-sticky-nav__links a.is-active {
  color: var(--kt-ink);
  background: var(--kt-gold);
  outline: none;
}

.lesson-sticky-nav__search {
  display: grid;
  grid-template-columns: auto minmax(150px, 1fr) auto;
  align-items: center;
  gap: .5rem;
}

.lesson-sticky-nav__search label {
  margin: 0;
  color: var(--kt-gold);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.lesson-sticky-nav__search input {
  min-height: 38px;
  padding: .52rem .7rem;
  border: 1px solid rgba(214, 164, 65, .32);
  border-radius: 5px;
  color: #f5f1e8;
  background: #111;
}

.lesson-sticky-nav__search input:focus {
  border-color: var(--kt-gold);
  outline: 2px solid rgba(214, 164, 65, .16);
}

.lesson-sticky-nav__search button {
  min-height: 38px;
  padding: .48rem .75rem;
  border: 1px solid var(--kt-gold);
  border-radius: 5px;
  color: var(--kt-gold);
  background: transparent;
  font-size: .74rem;
  font-weight: 800;
}

.lesson-sticky-nav__search button:hover {
  color: var(--kt-ink);
  background: var(--kt-gold);
}

.lesson-sticky-nav__hint {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.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, .91), rgba(8, 8, 8, .96)),
    url("../images/backgrounds/blackhex.webp") center top / 1500px auto repeat-y;
}

.lesson-content-wrap::before {
  content: "Glossary";
  display: block;
  width: min(920px, 100%);
  margin: 0 auto 1rem;
  color: var(--kt-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(4.25rem, 7vw, 6rem);
  border: 0;
  background: transparent;
  overflow: visible;
}

.lesson-section + .lesson-section {
  padding-top: clamp(3rem, 5vw, 4.5rem);
  border-top: 1px solid var(--kt-line);
}

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

.lesson-section h2 {
  max-width: 14ch;
  margin: 0 0 clamp(2rem, 4vw, 3rem);
  color: #f5f1e8;
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(2.5rem, 5vw, 4.6rem);
  font-weight: 500;
  letter-spacing: -.035em;
  line-height: .96;
  text-shadow: none;
}

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

.lesson-section h3 {
  margin: 2rem 0 .55rem;
  padding: 0;
  border: 0;
  color: var(--kt-gold-bright);
  font-family: "Cal Sans", sans-serif;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  font-weight: 500;
  line-height: 1.15;
}

.lesson-section h3:first-of-type {
  margin-top: 0;
}

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

.lesson-section p {
  margin: .35rem 0 0;
}

.lesson-section ul {
  margin: .55rem 0 0;
  padding-left: 1.25rem;
}

.lesson-section li {
  margin: .25rem 0;
}

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

.lesson-section strong {
  color: #f5f1e8;
  font-weight: 650;
}

.lesson-section h3.is-search-match {
  color: #fff0b8;
  text-shadow: 0 0 18px rgba(214, 164, 65, .42);
}

.lesson-section.is-filter-empty {
  opacity: .35;
}

.lesson-term-diagram {
  width: min(760px, 100%);
  margin: 1.25rem 0 2rem;
  overflow: hidden;
  border: 1px solid var(--kt-line);
  border-radius: 8px;
  background: rgba(13, 13, 13, .9);
  box-shadow: 0 18px 42px rgba(0, 0, 0, .22);
}

.lesson-term-diagram__title {
  display: block;
  width: 100%;
  max-width: none !important;
  margin: 0 !important;
  padding: .8rem 1rem;
  border-bottom: 1px solid var(--kt-line);
  color: #f5f1e8 !important;
  background: rgba(214, 164, 65, .08);
  font-weight: 700;
}

.lesson-term-diagram__row {
  display: grid;
  grid-template-columns: 110px 1fr;
  align-items: center;
  gap: .75rem;
  padding: .8rem 1rem;
}

.lesson-term-diagram__row + .lesson-term-diagram__row {
  border-top: 1px solid rgba(214, 164, 65, .16);
}

.lesson-term-diagram__label {
  margin: 0 !important;
  color: var(--kt-gold) !important;
  font-size: .72rem !important;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.lesson-term-diagram__track {
  display: grid;
  grid-template-columns: repeat(7, minmax(2rem, 1fr));
  gap: .4rem;
}

.lesson-term-pill,
.lesson-term-note {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  padding: .3rem .4rem;
  text-align: center;
}

.lesson-term-pill {
  border: 1px solid rgba(214, 164, 65, .48);
  border-radius: 5px;
  color: #171109;
  background: var(--kt-gold);
  font-weight: 800;
}

.lesson-term-note {
  color: #f5f1e8;
  font-weight: 700;
}

.lesson-term-note--root {
  color: var(--kt-gold-bright);
}

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

.lesson-final-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 {
  color: #171109;
  border-color: #efd58c;
  background: var(--kt-gold);
}

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

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

.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(--kt-gold);
  border-radius: 50%;
  color: #171109;
  background: var(--kt-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;
}

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

.theory-lesson-page .site-footer .audio-visualizer--footer {
  position: relative;
  inset: auto;
  width: 100%;
  max-width: none;
  height: 62px;
  margin: 0 !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 .site-footer .audio-visualizer--footer::before,
.theory-lesson-page .site-footer .audio-visualizer--footer::after {
  content: none !important;
  display: none !important;
  background: none !important;
}

.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;
}

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: 980px) {
  .lesson-sticky-nav {
    position: relative;
    grid-template-columns: 1fr;
  }

  .lesson-sticky-nav__links {
    overflow-x: auto;
    padding-bottom: .25rem;
  }
}

@media (max-width: 700px) {
  .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(3.1rem, 15vw, 4.8rem);
  }

  .lesson-sticky-nav {
    padding: .75rem;
  }

  .lesson-sticky-nav__search {
    grid-template-columns: 1fr auto;
  }

  .lesson-sticky-nav__search label {
    grid-column: 1 / -1;
  }

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

  .lesson-section {
    padding-bottom: 3.5rem;
  }

  .lesson-section + .lesson-section {
    padding-top: 3rem;
  }

  .lesson-section h2 {
    font-size: clamp(2.35rem, 12vw, 3.5rem);
  }

  .lesson-term-diagram__row {
    grid-template-columns: 1fr;
  }

  .lesson-term-diagram__track {
    grid-template-columns: repeat(7, minmax(1.8rem, 1fr));
    overflow-x: auto;
  }

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

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