/* ================================================
   3-Block Flow Structure CSS
   A (Preparation) → B (Offline Work) → C (Result)
   ================================================ */

/* 3ブロック全体のコンテナ */
.bt-flow-3blocks {
  display: flex;
  align-items: flex-start;
  gap: 32px;
  max-width: 1200px;
  margin: 48px auto 0;
  padding: 0 20px;
}

/* 矢印（A→BとB→Cの2本のみ） */
.bt-flow-arrow {
  color: #cbd5e1;
  font-weight: 700;
  font-size: 36px;
  user-select: none;
  display: flex;
  align-items: center;
  padding-top: 120px;
  flex-shrink: 0;
}

/* ブロック共通スタイル */
.bt-flow-block {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Block A: 準備（オンライン）- 左側、小さめ */
.bt-flow-block--prep {
  flex: 0 0 220px;
}

/* Block B: 現場作業（オフライン）- 中央、メイン、大きい枠 */
.bt-flow-block--main {
  flex: 1;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 3px solid #3b82f6;
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
}

/* Block C: 結果反映（オンライン）- 右側、Aと同サイズ */
.bt-flow-block--result {
  flex: 0 0 220px;
}

/* ブロックラベル共通 */
.bt-flow-block__label {
  font-size: 14px;
  font-weight: 700;
  color: #64748b;
  text-align: center;
  padding: 6px 16px;
  background: #f1f5f9;
  border-radius: 20px;
  display: inline-block;
  align-self: center;
  letter-spacing: 0.05em;
}

/* メインブロックのラベル（オフライン強調） */
.bt-flow-block__label--main {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  font-size: 15px;
  font-weight: 700;
  padding: 10px 24px;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  display: flex;
  align-items: center;
  gap: 8px;
}

.bt-flow-block__icon {
  font-size: 18px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* メインブロックのコンテンツエリア */
.bt-flow-block__content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

/* カード共通スタイル */
.bt-flow-card {
  background: white;
  border: 2px solid #e5e7eb;
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.bt-flow-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.1);
  border-color: #cbd5e1;
}

/* コンパクトカード（オフラインエリア内） */
.bt-flow-card--compact {
  border-radius: 12px;
}

/* ハイライトカード（Light） */
.bt-flow-card--highlight {
  border-color: #3b82f6;
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
  transform: scale(1.03);
}

.bt-flow-card--highlight:hover {
  transform: scale(1.03) translateY(-4px);
  box-shadow: 0 12px 30px rgba(59, 130, 246, 0.3);
}

/* 画像エリア */
.bt-flow-card__imgWrap {
  background: #f8fafc;
  padding: 12px;
}

.bt-flow-card__img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 10px;
  display: block;
  transition: transform 0.3s ease;
}

.bt-flow-card--compact .bt-flow-card__img {
  height: 100px;
}

.bt-flow-card:hover .bt-flow-card__img {
  transform: scale(1.05);
}

/* カードメタ情報 */
.bt-flow-card__meta {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px;
}

.bt-flow-card--compact .bt-flow-card__meta {
  padding: 10px 12px;
}

/* 番号バッジ */
.bt-flow-card__num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  flex: 0 0 auto;
  font-size: 15px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.bt-flow-card--compact .bt-flow-card__num {
  width: 26px;
  height: 26px;
  font-size: 13px;
}

/* テキストエリア */
.bt-flow-card__text {
  flex: 1;
  min-width: 0;
}

.bt-flow-card__label {
  margin: 0;
  font-weight: 700;
  color: #111827;
  font-size: 14px;
  line-height: 1.4;
}

.bt-flow-card--compact .bt-flow-card__label {
  font-size: 12px;
}

/* ================================================
   レスポンシブ対応
   ================================================ */

/* タブレット（980px以下） */
@media (max-width: 980px) {
  .bt-flow-3blocks {
    flex-direction: column;
    gap: 24px;
    align-items: stretch;
  }

  .bt-flow-arrow {
    transform: rotate(90deg);
    padding-top: 0;
    align-self: center;
    font-size: 32px;
  }

  .bt-flow-block--prep,
  .bt-flow-block--result {
    flex: 1;
  }

  .bt-flow-block--main {
    padding: 20px;
  }

  .bt-flow-block__content {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
}

/* モバイル（640px以下） */
@media (max-width: 640px) {
  .bt-flow-3blocks {
    padding: 0 16px;
    gap: 20px;
  }

  .bt-flow-arrow {
    font-size: 28px;
  }

  .bt-flow-block--main {
    padding: 16px;
  }

  .bt-flow-block__label {
    font-size: 13px;
    padding: 6px 14px;
  }

  .bt-flow-block__label--main {
    font-size: 14px;
    padding: 8px 20px;
  }

  .bt-flow-block__content {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .bt-flow-card__img {
    height: 120px;
  }

  .bt-flow-card--compact .bt-flow-card__img {
    height: 90px;
  }

  .bt-flow-card__label {
    font-size: 13px;
  }

  .bt-flow-card--compact .bt-flow-card__label {
    font-size: 11px;
  }
}

/* 極小モバイル（480px以下） */
@media (max-width: 480px) {
  .bt-flow-3blocks {
    gap: 16px;
  }

  .bt-flow-arrow {
    font-size: 24px;
  }

  .bt-flow-block__label {
    font-size: 12px;
    padding: 5px 12px;
  }

  .bt-flow-block__label--main {
    font-size: 13px;
    padding: 7px 16px;
  }

  .bt-flow-card__img {
    height: 100px;
  }

  .bt-flow-card--compact .bt-flow-card__img {
    height: 80px;
  }

  .bt-flow-card__num {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .bt-flow-card--compact .bt-flow-card__num {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }
}