.melody {
  flex: 1;
  padding: var(--space-page);
  overflow-y: auto;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
}

.btn {
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.btn--accent {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent-line);
}

.btn--accent:hover {
  background: rgba(108, 158, 255, 0.25);
  border-color: rgba(108, 158, 255, 0.55);
  transform: translateY(-1px);
}

.melody__input-panel {
  margin-bottom: 2rem;
}

.melody__label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.melody__textarea {
  width: 100%;
  max-width: 640px;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.95rem;
  resize: vertical;
}

.melody__textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.melody__hint {
  margin: 0.5rem 0 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.melody__quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.melody__quick-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.melody__chip {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.melody__chip:hover {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent);
}

.melody__analyze {
  margin-top: 0.25rem;
}

.melody__error {
  margin: 0.75rem 0 0;
  color: #ff6b6b;
  font-size: 0.85rem;
}

.melody__section-title {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.melody__parsed-notes {
  margin: 0 0 1.5rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--chord);
  font-weight: 600;
}

.melody__key-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.melody__keys-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.melody__keys-head .melody__section-title {
  margin: 0;
}

.melody-piano-wrap {
  margin: 1rem 0 1.25rem;
  max-width: 100%;
}

.melody-piano {
  --white-key-w: clamp(28px, 9vw, 42px);
  --white-key-h: clamp(96px, 26vw, 140px);
  --black-key-w: clamp(18px, 6vw, 28px);
  --black-key-h: calc(var(--white-key-h) * 0.63);
  --black-key-offset: calc(var(--black-key-w) * -0.5);
  display: flex;
  flex-wrap: nowrap;
  gap: clamp(0.5rem, 2vw, 1rem);
  padding: clamp(0.5rem, 2vw, 0.75rem);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  overflow-x: auto;
  overflow-y: visible;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x;
  max-width: 100%;
}

.piano-octave__label {
  margin: 0 0 0.35rem;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.piano-octave__keys {
  display: flex;
  position: relative;
}

.piano-key-wrap {
  position: relative;
}

.piano-key {
  border: 1px solid var(--border);
  cursor: pointer;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  font-weight: 600;
  transition: background 0.08s, transform 0.08s;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.piano-key--white {
  width: var(--white-key-w);
  height: var(--white-key-h);
  border-radius: 0 0 6px 6px;
  background: #e8ecf4;
  color: #1a2744;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 0.5rem;
}

.piano-key--black {
  position: absolute;
  top: 0;
  right: var(--black-key-offset);
  width: var(--black-key-w);
  height: var(--black-key-h);
  z-index: 3;
  pointer-events: auto;
  border-radius: 0 0 4px 4px;
  background: #2a3144;
  color: #e8ecf4;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 0.35rem;
}

.piano-key:hover {
  filter: brightness(1.05);
}

.piano-key.is-pressed,
.piano-key:active {
  transform: translateY(1px);
  background: var(--accent-soft);
}

.piano-key--black.is-pressed,
.piano-key--black:active {
  background: #3d4a66;
}

.piano-key-wrap:last-child .piano-key--black {
  right: calc(var(--black-key-w) * 0.2);
}

.piano-key--white.is-in-scale {
  background: linear-gradient(180deg, #bbf7d0 0%, #4ade80 100%);
  border-color: #16a34a;
  color: #14532d;
  box-shadow: inset 0 -2px 0 rgba(22, 163, 74, 0.35);
}

.piano-key--black.is-in-scale {
  background: linear-gradient(180deg, #22c55e 0%, #15803d 100%);
  border-color: #166534;
  color: #ecfdf5;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.15);
}

.piano-key.is-in-scale:hover {
  filter: brightness(1.08);
}

.melody-piano__actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.65rem;
}

.melody-key {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  min-width: 120px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.melody-key:hover {
  border-color: var(--accent);
}

.melody-key--top {
  border-color: rgba(108, 158, 255, 0.45);
  background: rgba(108, 158, 255, 0.08);
}

.melody-key--active {
  border-color: rgba(108, 158, 255, 0.55);
  box-shadow: inset 0 0 0 1px rgba(108, 158, 255, 0.25);
}

.melody-key__name {
  font-weight: 700;
  font-family: "JetBrains Mono", monospace;
  color: var(--chord);
}

.melody-key__score {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.melody-match-section {
  margin-bottom: 2rem;
}

.melody-match-section__title {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  color: var(--accent);
}

.melody-match-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.melody-match {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.melody-match:hover {
  border-color: var(--accent);
  background: var(--surface-2);
}

.melody-match__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.melody-match__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.melody-match__title {
  font-weight: 700;
}

.melody-match__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
}

.melody-match__key,
.melody-match__badge {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
}

.melody-match__key {
  background: rgba(108, 158, 255, 0.14);
  color: var(--accent);
}

.melody-match__badge {
  background: rgba(255, 179, 71, 0.16);
  color: var(--chord);
}

.melody-match__send {
  align-self: flex-start;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.melody-match__send:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.melody-match__send.is-plan-locked {
  border-style: dashed;
  opacity: 0.9;
}


.melody-pro {
  margin: 0 0 1.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(108, 158, 255, 0.28);
  background:
    radial-gradient(ellipse 80% 120% at 0% 0%, rgba(108, 158, 255, 0.12), transparent),
    var(--surface);
}

.melody-pro__head {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.35rem;
}

.melody-pro__head .melody__section-title {
  margin: 0;
}

.melody-pro__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px dashed rgba(255, 179, 71, 0.45);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--chord);
}

.melody-pro__controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  margin-top: 0.85rem;
}

.melody-pro__field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: min(100%, 14rem);
}

.melody-pro__label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.melody-pro__toggle {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.2rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
}

.melody-pro__btn {
  padding: 0.4rem 0.75rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.melody-pro__btn.is-active {
  background: var(--studio-fill);
  color: #fff;
}

.melody-pro__btn.is-plan-locked {
  border: 1px dashed var(--border);
}

.melody-pro__select {
  min-width: 11rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
}

.melody-match__score {
  font-size: 0.68rem;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
  text-align: right;
  line-height: 1.35;
  flex-shrink: 0;
}

.melody-score-note {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  background: var(--surface-2);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.melody-match__deg {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: "JetBrains Mono", monospace;
}

.melody-match__chords {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .melody-match__head {
    flex-direction: column;
    align-items: flex-start;
  }

  .melody-match__score {
    text-align: left;
  }
}