/* === 共通レイアウト・セクション === */
.product-section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2em 1em;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #333;
    background-color: #fff;
  }
  
  .item_title {
    font-size: 32px;
    text-align: center;
    font-weight: bold;
    margin: 2em 0 1em;
    color: #222;
  }
  
  .item-subtext {
    text-align: center;
    font-size: 16px;
    margin-bottom: 2em;
    line-height: 1.6;
  }
  
  /* === イメージ＋テキストコンテナ（左右並び対応） === */
  .flex-image-text {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5em;
    margin-bottom: 2em;
  }
  
  .flex-image-text .text {
    flex: 1 1 45%;
    font-size: 16px;
    line-height: 1.6;
  }
  
  .flex-image-text .text h3 {
    font-size: 20px;
    margin-bottom: 0.5em;
    color: #444;
  }
  
  .flex-image-text .image {
    flex: 1 1 45%;
    text-align: center;
  }
  
  .flex-image-text .image img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
  }
  
  /* === セクションブロック（同梱物、特徴、仕様など） === */
  .item-block {
    margin-top: 3em;
  }
  
  .ttl-h3 {
    font-size: 24px;
    border-left: 6px solid #f4a261;
    padding-left: 0.6em;
    margin-bottom: 1em;
    color: #333;
  }
  
  /* === スペック表（2列構成） === */
  .spec-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1em;
  }
  
  .spec-block {
    flex: 1 1 48%;
    background: #f2f2f2;
    padding: 1em;
    border-radius: 8px;
  }
  
  .spec-title {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 0.3em;
    color: #555;
  }
  
  .spec-content p {
    margin: 0;
    font-size: 15px;
    color: #222;
  }

  .feature-section {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 2rem;
    margin: 30px 0;
  }

  .feature-section.reverse {
    flex-direction: row-reverse;
  }
  
  
  
  .feature-content {
    flex: 1 1 50%;
    max-width: 50%;
    padding: 0 20px;
  }
  
  .feature-image {
    flex: 1 1 50%;
    max-width: 50%;
    text-align: center;
  }
  
  .feature-image img {
    width: 100%;
    height: auto;
    max-width: 600px;
    border-radius: 8px;
  }
  
  .feature-number {
    font-size: 64px;
    color: #f2f2f2;
    font-weight: bold;
    line-height: 1;
    /* margin-bottom: -5px; */
  }
  
  .feature-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 8px;
  }
  
  .feature-underline {
    width: 80px;
    height: 3px;
    background-color: #00bcd4;
    margin-bottom: 16px;
  }
  
  .feature-text {
    font-size: 16px;
    line-height: 1.8;
    color: #333;
  }
  .how-to-use {
    margin: 80px 0;
    text-align: center;
  }
  
  .section-title {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 40px;
  }
  
  .steps-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
  }
  
  .step {
    width: 200px;
    text-align: center;
  }
  
  .step img {
    width: 100%;
    height: auto;
    margin-bottom: 12px;
  }
  
  .step-num {
    font-size: 20px;
    color: #00bcd4;
    font-weight: bold;
    margin-right: 4px;
  }
  
  .steps-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
  }
  
  .steps-row {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
  }
  
  .step {
    width: 200px;
    text-align: center;
    font-size: 14px;
  }
  
  .step-number {
    font-size: 24px;
    color: #00AEEF;
    font-weight: bold;
  }
  
  .step-image {
    width: 100%;
    height: auto;
    margin-bottom: 10px;
  }
  
  
  
  
  
  /* === メディアクエリ（スマホ） === */
  @media (max-width: 768px) {
    .flex-image-text {
      flex-direction: column;
    }
  
    .spec-block {
      flex: 1 1 100%;
    }
  
    .item-title {
      font-size: 26px;
    }
  
    .ttl-h3 {
      font-size: 20px;
    }

    .feature-section,
  .feature-section.reverse {
    flex-direction: column;
  }

  .feature-content,
  .feature-image {
    max-width: 100%;
    flex: 1 1 100%;
    text-align: left;
    padding: 0;
  }

  .feature-image img {
    max-width: 100%;
  }
/* レスポンシブ：スマホなど画面が狭いときは縦1列 */

    .steps-row {
      flex-direction: column;
      align-items: center;
    }
  
    .step {
      width: 100%;
      max-width: 300px;
    }
  }