/* 乐器入门 · 扩展 LessonEngine 视觉 */
.ii-keyboard { text-align: center; margin: 12px 0; }

.ii-keys {
  display: flex;
  justify-content: center;
  gap: 2px;
  flex-wrap: wrap;
  max-width: 360px;
  margin: 0 auto;
}

.ii-w, .ii-b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 0 0 6px 6px;
  min-width: 26px;
  height: 52px;
}

.ii-w {
  background: #fff;
  border: 2px solid #ccc;
  color: #5a3fd4;
}

.ii-b {
  background: #333;
  color: #eee;
  border: 2px solid #111;
  height: 34px;
  margin-top: 0;
  align-self: flex-start;
}

.ii-caption {
  font-size: 0.78rem;
  color: #7a7590;
  margin-top: 10px;
}

.ii-strings {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 280px;
  margin: 12px auto;
}

.ii-string {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: #fff;
  border: 2px solid #ece6ff;
  border-radius: 10px;
  font-size: 0.9rem;
}

.ii-string.hl {
  border-color: #7c5cff;
  background: #f5f0ff;
}

.ii-string span {
  font-size: 0.75rem;
  color: #7a7590;
  min-width: 1.4em;
}

.ii-string small {
  margin-left: auto;
  font-size: 0.72rem;
  color: #7a7590;
}