.scale-main {
  min-height: 100vh;
}

.scale-hero,
.scale-privacy,
.scale-shell,
.scale-notes {
  width: min(100% - 2rem, var(--max-width));
  margin-right: auto;
  margin-left: auto;
}

.scale-hero {
  min-height: 86svh;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(26rem, 0.68fr);
  gap: clamp(3rem, 8vw, 7rem);
  align-items: center;
  padding: 9rem 0 5rem;
}

.scale-hero h1 {
  max-width: 8ch;
  margin-bottom: 0.85rem;
  font-size: clamp(4.7rem, 10.5vw, 8.7rem);
  line-height: 0.86;
}

.scale-tagline {
  max-width: 29ch;
  margin-bottom: 1rem;
  color: var(--accent-strong);
  font-size: clamp(1.35rem, 3vw, 2.1rem);
  font-weight: 850;
  line-height: 1.08;
}

.scale-hero-map {
  min-height: 30rem;
  display: grid;
  align-content: space-between;
  overflow: hidden;
  padding: 1.2rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.7rem;
  background:
    linear-gradient(145deg, rgba(127, 230, 234, 0.13), transparent 42%),
    rgba(4, 10, 14, 0.97);
  box-shadow:
    inset 0 0 4rem rgba(73, 188, 194, 0.06),
    0 2.5rem 6rem rgba(0, 0, 0, 0.42);
  transform: perspective(70rem) rotateY(-3deg);
}

.scale-map-topline,
.scale-map-readout {
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
  color: var(--subtle);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.scale-map-strings {
  display: grid;
  gap: 0.75rem;
  padding: 1.4rem 0.8rem;
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent, rgba(73, 188, 194, 0.07), transparent),
    rgba(0, 0, 0, 0.18);
}

.scale-map-strings > div {
  position: relative;
  min-height: 2.4rem;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.55rem;
  align-items: center;
}

.scale-map-strings > div::before {
  position: absolute;
  right: 0;
  left: 0;
  height: 2px;
  background: rgba(230, 246, 247, 0.32);
  content: "";
}

.scale-map-strings i,
.scale-map-strings b {
  position: relative;
  z-index: 1;
  min-height: 1.8rem;
  display: grid;
  place-items: center;
}

.scale-map-strings b {
  border: 1px solid var(--accent-strong);
  border-radius: 50%;
  background: #08151a;
  color: var(--accent-strong);
  font-size: 0.58rem;
  text-transform: uppercase;
  box-shadow: 0 0 1rem rgba(73, 188, 194, 0.24);
}

.scale-map-strings > div:nth-child(2) b:last-child,
.scale-map-strings > div:nth-child(4) b:nth-child(3) {
  background: var(--accent-strong);
  color: #021013;
}

.scale-privacy {
  margin-bottom: 2.5rem;
}

.scale-shell {
  margin-bottom: clamp(4rem, 8vw, 7rem);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 0.75rem;
  background:
    linear-gradient(145deg, rgba(73, 188, 194, 0.08), transparent 35%),
    rgba(5, 10, 14, 0.97);
  box-shadow: 0 2.5rem 7rem rgba(0, 0, 0, 0.42);
}

.scale-shell-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.4fr);
  gap: 2rem;
  align-items: end;
  padding: 1.5rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}

.scale-shell-header .section-kicker {
  display: block;
  margin-bottom: 0.8rem;
}

.scale-shell-header h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3.6rem);
}

.scale-formula {
  display: grid;
  gap: 0.35rem;
  padding-left: 1rem;
  border-left: 1px solid var(--line-strong);
}

.scale-formula span {
  color: var(--subtle);
  font-size: 0.64rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scale-formula strong {
  color: var(--accent-strong);
  font-size: 0.86rem;
  line-height: 1.5;
}

.scale-controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
  padding: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.scale-field {
  min-width: 0;
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: rgba(255, 255, 255, 0.025);
}

.scale-field > span,
.scale-field legend {
  padding: 0;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.scale-field select {
  width: 100%;
  min-height: 3rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.35rem;
  background: #061015;
  color: var(--text);
}

.scale-segmented {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
}

.scale-segmented label {
  position: relative;
  cursor: pointer;
}

.scale-segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.scale-segmented span {
  min-height: 3rem;
  display: grid;
  place-items: center;
  padding: 0.55rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.scale-segmented input:checked + span {
  border-color: var(--accent-strong);
  background: rgba(73, 188, 194, 0.13);
  color: var(--text);
}

.scale-segmented input:focus-visible + span {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.scale-focus-field {
  grid-column: span 4;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1.2rem;
  align-items: center;
}

.scale-focus-toggle {
  display: flex;
  gap: 0.65rem;
  align-items: center;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 800;
  cursor: pointer;
}

.scale-focus-toggle input {
  width: 1.2rem;
  height: 1.2rem;
  accent-color: var(--accent-strong);
}

.scale-focus-range {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 7rem;
  gap: 1rem;
  align-items: center;
}

.scale-focus-range input {
  width: 100%;
  accent-color: var(--accent-strong);
}

.scale-focus-range output {
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 850;
  text-align: right;
  text-transform: uppercase;
}

.scale-focus-range.is-disabled {
  opacity: 0.42;
}

.scale-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  padding: 1.4rem 1.5rem;
}

.scale-overview p {
  max-width: 50rem;
  margin: 0 0 0.9rem;
  color: var(--muted);
}

.scale-note-list,
.scale-playback,
.scale-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}

.scale-note-list span {
  min-width: 2.25rem;
  padding: 0.38rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  text-align: center;
}

.scale-note-list span.is-root {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #021013;
}

.scale-status {
  min-height: 2.8rem;
  margin: 0;
  padding: 0.75rem 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.scale-fretboard-scroll {
  overflow-x: auto;
  padding: 0 1.2rem 0.8rem;
  scrollbar-color: var(--accent) rgba(255, 255, 255, 0.06);
}

.scale-fretboard-scroll:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: -3px;
}

.scale-fretboard {
  --fret-count: 16;
  min-width: 70rem;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background:
    linear-gradient(90deg, rgba(73, 188, 194, 0.03), rgba(127, 230, 234, 0.075), rgba(73, 188, 194, 0.03)),
    #030709;
}

.fretboard-row {
  display: grid;
  grid-template-columns: 4.5rem repeat(var(--fret-count), minmax(3.4rem, 1fr));
}

.fretboard-header {
  margin-bottom: 0.35rem;
}

.fretboard-header span {
  min-height: 1.8rem;
  display: grid;
  place-items: center;
  color: var(--subtle);
  font-size: 0.62rem;
  font-weight: 850;
}

.string-label {
  display: grid;
  place-content: center;
  border-right: 2px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  text-align: center;
}

.string-label strong,
.string-label small {
  display: block;
}

.string-label small {
  margin-top: 0.15rem;
  color: var(--subtle);
  font-size: 0.55rem;
}

.fret-cell {
  position: relative;
  min-height: 3.65rem;
  display: grid;
  place-items: center;
  border-right: 1px solid rgba(186, 221, 224, 0.2);
  background: linear-gradient(
    to bottom,
    transparent calc(50% - 1px),
    rgba(224, 239, 240, 0.28) calc(50% - 1px),
    rgba(224, 239, 240, 0.28) calc(50% + 1px),
    transparent calc(50% + 1px)
  );
  transition: opacity 160ms ease, background-color 160ms ease;
}

.fret-cell.is-open {
  border-right-width: 2px;
  border-right-color: rgba(224, 239, 240, 0.42);
}

.fret-cell.is-outside-focus {
  opacity: 0.23;
}

.fret-cell.is-focus-edge-start {
  box-shadow: inset 2px 0 rgba(127, 230, 234, 0.72);
}

.fret-cell.is-focus-edge-end {
  box-shadow: inset -2px 0 rgba(127, 230, 234, 0.72);
}

.fret-note {
  position: relative;
  z-index: 1;
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(127, 230, 234, 0.72);
  border-radius: 50%;
  background: #08151a;
  color: var(--accent-strong);
  font-size: 0.68rem;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 0 0.8rem rgba(73, 188, 194, 0.18);
}

.fret-note:hover {
  border-color: #d4ffff;
  color: #d4ffff;
  transform: translateY(-1px);
}

.fret-note.is-root {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #021013;
  box-shadow: 0 0 1.1rem rgba(127, 230, 234, 0.45);
}

.fret-note.is-playing {
  outline: 3px solid #d4ffff;
  outline-offset: 2px;
}

.scale-legend {
  padding: 0.9rem 1.5rem 1.4rem;
  color: var(--subtle);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.scale-legend span {
  display: inline-flex;
  gap: 0.4rem;
  align-items: center;
}

.scale-legend i {
  width: 0.8rem;
  height: 0.8rem;
  display: inline-block;
  border: 1px solid var(--accent-strong);
  border-radius: 50%;
}

.scale-legend .legend-root {
  background: var(--accent-strong);
}

.scale-legend .legend-focus {
  border-radius: 0.15rem;
  background: rgba(127, 230, 234, 0.18);
}

.scale-fallback {
  padding: 2rem;
  text-align: center;
}

.scale-fallback strong {
  color: var(--accent-strong);
  font-size: 1.4rem;
}

.scale-fallback p {
  max-width: 48rem;
  margin: 0.7rem auto 0;
  color: var(--muted);
}

.scale-notes {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) minmax(0, 1fr);
  gap: clamp(2rem, 7vw, 6rem);
  padding: 0 0 clamp(5rem, 9vw, 8rem);
}

@media (max-width: 980px) {
  .scale-hero,
  .scale-shell-header,
  .scale-notes {
    grid-template-columns: minmax(0, 1fr);
  }

  .scale-hero-map {
    transform: none;
  }

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

  .scale-focus-field {
    grid-column: span 2;
  }

  .scale-formula {
    padding: 0.9rem 0 0;
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }
}

@media (max-width: 680px) {
  .scale-hero {
    min-height: auto;
    padding-top: 12rem;
  }

  .scale-hero h1 {
    font-size: clamp(3.7rem, 18vw, 5.2rem);
  }

  .scale-hero-map {
    min-height: 25rem;
  }

  .scale-controls,
  .scale-overview,
  .scale-focus-field,
  .scale-focus-range {
    grid-template-columns: 1fr;
  }

  .scale-focus-field {
    grid-column: auto;
  }

  .scale-focus-range output {
    text-align: left;
  }

  .scale-playback,
  .scale-playback .button {
    width: 100%;
  }

  .scale-shell {
    width: min(100% - 1rem, var(--max-width));
  }

  .scale-shell-header,
  .scale-controls,
  .scale-overview {
    padding-right: 1rem;
    padding-left: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fret-cell,
  .fret-note {
    transition: none;
  }

  .fret-note:hover {
    transform: none;
  }
}