/* ==============================================================================
   7. HISTORY (沿革) タブ専用スタイル
   ============================================================================== */
.p-aboutus-history-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
  font-family:
    "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color: #333;
  text-align: left;
}

.p-aboutus-history-main-title {
  font-size: 1.75rem;
  font-weight: bold;
  margin-bottom: 5px;
  letter-spacing: 0.05em;
  border-bottom: 2px solid #333;
  padding-bottom: 12px;
}

.p-aboutus-history-timeline {
  position: relative;
  padding: 20px 0;
  margin-top: 15px;
}

.p-aboutus-history-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: #1a6fa5;
}

.p-aboutus-history-timeline::after {
  content: "";
  position: absolute;
  left: 3px;
  bottom: -10px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 10px solid #1a6fa5;
}

.p-aboutus-history-item {
  position: relative;
  display: flex;
  flex-direction: column;
  margin-bottom: 35px;
  padding-left: 30px;
}

.p-aboutus-history-item:last-child {
  margin-bottom: 0;
}

.p-aboutus-history-year {
  width: auto;
  font-size: 1.1rem;
  font-weight: bold;
  color: #1a6fa5;
  margin-bottom: 5px;
  text-align: left;
}

.p-aboutus-history-dot {
  position: absolute;
  left: 1px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #1a6fa5;
  z-index: 2;
  box-shadow: 0 0 0 4px #fff;
}

.p-aboutus-history-content {
  width: 100%;
  line-height: 1.7;
}

.p-aboutus-history-title {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 5px;
}

.p-aboutus-history-text {
  margin: 0 0 12px 0;
  color: #444;
  font-size: 0.95rem;
}

.p-aboutus-history-text:last-of-type {
  margin-bottom: 0;
}

.p-aboutus-history-topic-box {
  background: #eef6fa;
  border-left: 4px solid #1a6fa5;
  padding: 12px 15px;
  border-radius: 0 4px 4px 0;
  margin-top: 10px;
}

.p-aboutus-history-topic-label {
  font-weight: bold;
  color: #1a6fa5;
  display: inline-block;
  margin-bottom: 3px;
  font-size: 0.9rem;
}

.p-aboutus-history-topic-text {
  margin: 0;
  font-size: 0.9rem;
  color: #222;
  line-height: 1.5;
}

/* ==============================================================================
   8. メディアクエリ（レスポンシブ対応）
   ============================================================================== */
/* スマホ横向き（低画面高） */
@media screen and (max-height: 500px) and (orientation: landscape) {
  /* 必要に応じて個別の横向き調整を追記 */
}

/* タブレット・中画面（高画面高） */
@media screen and (min-width: 768px) and (min-height: 501px) {
  .p-aboutus-history-container {
    padding: 60px 20px;
  }

  .p-aboutus-history-main-title {
    font-size: 2rem;
    padding-bottom: 15px;
  }

  .p-aboutus-history-timeline {
    padding: 40px 0;
    margin-top: 20px;
  }

  .p-aboutus-history-timeline::before {
    left: 95px;
  }

  .p-aboutus-history-timeline::after {
    left: 91px;
  }

  .p-aboutus-history-item {
    flex-direction: row;
    padding-left: 0;
    margin-bottom: 40px;
  }

  .p-aboutus-history-year {
    width: 80px;
    text-align: right;
    font-size: 1.2rem;
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .p-aboutus-history-dot {
    position: static;
    margin-left: 9px;
    margin-right: 25px;
    margin-top: 6px;
    flex-shrink: 0;
  }

  .p-aboutus-history-content {
    flex: 1;
    line-height: 1.8;
  }

  .p-aboutus-history-title {
    font-size: 1.1rem;
  }

  .p-aboutus-history-text {
    font-size: 1rem;
    margin-bottom: 15px;
  }

  .p-aboutus-history-topic-box {
    padding: 15px 20px;
  }

  .p-aboutus-history-topic-text {
    font-size: 0.95rem;
    line-height: 1.6;
  }
}

/* PC・大画面（高画面高） */
@media screen and (min-width: 1024px) and (min-height: 501px) {
  /* 768pxのスタイルが自動的に継承されます。PC専用のさらなる微調整があればここに追記 */
}