/* メイン領域をFlexセンター */
    .index-wrapper {
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      /* ヘッダー＋フッターで合計120pxなら */
      height: calc(100vh - 120px);
      overflow: hidden;
    }
    /* 泡用レイヤー */
    #bubble-bg {
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      pointer-events: none;
      z-index: 0;
    }
  .bubble {
    position: absolute;
    bottom: -40px;
    background: rgba(173, 216, 230, 0.7);  /* lightblue */
    border: 1px solid rgba(173, 216, 230, 1);
    border-radius: 50%;
    animation: rise 6s infinite ease-in;
    z-index: 0;
  }
    @keyframes rise {
      to { transform: translateY(-120vh) scale(1.5); opacity: 0; }
    }
    /* テキストは上に重ねる */
    .index-content {
      position: relative;
      z-index: 1;
      text-align: center;
      color: #333;
    }
    .index-content .title {
      font-size: 3rem;
      margin: 0;
      animation: pop 1s ease-out;
    }
    @keyframes pop {
      from { transform: scale(0.5); opacity: 0; }
      to   { transform: scale(1); opacity: 1; }
    }
    .index-content .desc {
      font-size: 1.2rem;
      margin-top: 0.5rem;
    }

/* 各セクションの共通スタイル */
    .index-section {
      padding: 80px 20px;
      text-align: center;
    }
    .index-section:nth-child(even) {
      background: #f7f9fc;
    }
    .index-section h2 {
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .index-section p {
      font-size: 1rem;
      max-width: 600px;
      margin: 0 auto;
      line-height: 1.6;
    }
    
    
    .index-section .cta {
  margin-top: 24px;
  text-align: center;
}
.index-section .cta p {
  font-size: 1.1rem;
  margin-bottom: 12px;
}
.index-section .cta .btn {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

.index-section {
  padding: 80px 20px;
  text-align: center;
  min-height: 100vh; /* ←画面いっぱいにする！ */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}