.chart-title {
  font: 700 18px/1.4 ui-sans-serif, system-ui;
  margin: 0 0 8px 4px;
  color: #333;
}
.histogram {
  display: grid;
  grid-auto-flow: column;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 12px;
  max-width: 260px;
  overflow-x: auto;
}
.bar-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 25px; /* 幅を半分に変更 */
}
.bar-area {
  height: 150px; /* 高さ基準 */
  display: flex;
  align-items: flex-end;
  width: 100%;
}
.bar {
  width: 100%;
  background: linear-gradient(#6fdc6f, #2d8f2d); /* 緑系グラデーション */
  border-radius: 10px 10px 0 0;
  position: relative;
  transition: height .2s ease;
}
.bar::after {
  content: attr(data-count);
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  font: 600 12px/1.2 ui-sans-serif, system-ui;
}
.xlabel {
  margin-top: 6px;
  display: grid;
  place-items: center;
}
.xlabel img {
  width: 30px;
  height: 30px;
  object-fit: contain;
}