/* ===================================================================
  knowledge.css
  再生亜鉛の基礎知識ページ専用

  メインビジュアルとリード文は common.css の共通スタイル
  （.lower-mv / .lower-lead）を使用しています。

  画像配置先：images/knowledge/knowledge_mv.jpg
  推奨サイズ：横 1920px × 縦 820px 以上
  推奨アスペクト比：約 7:3
=================================================================== */

/* メインビジュアル：再生亜鉛の基礎知識ページ用の表示位置 */
.lower-mv__image {
  object-position: center center;
}

@media (max-width: 768px) {
  .lower-mv__image {
    object-position: center center;
  }
}

/* ===================================================================
  亜鉛の用途と身近な製品

  画像配置先：
  images/knowledge/knowledge_products_01.jpg ～ knowledge_products_06.jpg
  推奨サイズ：各 横600px × 縦400px（3:2）
  表示上限：幅340px、高さauto

  .knowledge-card-grid / .knowledge-card は、以降の同形式セクションでも
  流用できるカードレイアウトとして設定しています。
=================================================================== */
.knowledge-products {
  padding: 0 0 80px;
}

.knowledge-products__lead {
  margin: 42px 0 52px;
  font-size: 16px;
  line-height: 1.9;
}

.knowledge-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.knowledge-card {
  min-width: 0;
  padding: 24px 20px 30px;
  background: #D8E8F1;
}

.knowledge-card__title {
  margin-bottom: 18px;
  color: var(--color-main);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.45;
}

.knowledge-card__image {
  width: 100%;
  max-width: 340px;
  margin: 0 auto 18px;
}

.knowledge-card__image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.knowledge-card__list {
  margin: 0;
  padding: 0;
}

.knowledge-card__list li {
  position: relative;
  padding-left: 1em;
  font-size: 16px;
  line-height: 1.85;
}

.knowledge-card__list li + li {
  margin-top: 4px;
}

.knowledge-card__list li::before {
  content: "・";
  position: absolute;
  top: 0;
  left: 0;
}

@media (max-width: 768px) {
  .knowledge-products {
    padding: 0 0 60px;
  }

  .knowledge-products__lead {
    margin: 30px 0 36px;
    line-height: 1.9;
  }

  .knowledge-card-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .knowledge-card {
    padding: 22px 18px 26px;
  }

  .knowledge-card__title {
    margin-bottom: 16px;
    font-size: 20px;
  }

  .knowledge-card__image {
    max-width: 340px;
    margin-bottom: 16px;
  }

  .knowledge-card__list li {
    line-height: 1.8;
  }
}


/* ===================================================================
  亜鉛リサイクルの原料
=================================================================== */
.knowledge-material {
  padding: 0 0 80px;
}

.knowledge-material__lead {
  margin: 42px 0 46px;
  font-size: 16px;
  line-height: 1.9;
}

.knowledge-material__subheading {
  margin: 0 0 30px;
  color: var(--color-sub1);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.5;
}

.knowledge-card__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
}

.knowledge-flow-arrow {
  width: 70px;
  height: 70px;
  margin: 28px auto;
}

.knowledge-flow-arrow img {
  display: block;
  width: 70px;
  height: 70px;
}

.knowledge-process-box {
  display: grid;
  grid-template-columns: minmax(0, 400px) minmax(0, 400px);
  justify-content: center;
  align-items: start;
  gap: 48px;
  padding: 40px;
  border: 1px solid #CCCCCC;
}

.knowledge-process-box__image {
  width: 100%;
  max-width: 400px;
  margin: 0;
}

.knowledge-process-box__image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.knowledge-process-box__body {
  min-width: 0;
}

.knowledge-process-box__title {
  margin-bottom: 12px;
  color: #025AA1;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
}

.knowledge-process-box__text {
  margin-bottom: 22px;
  font-size: 16px;
  line-height: 1.85;
}

.knowledge-process-box__button {
  border: 1px solid var(--color-main);
}

.knowledge-material__group {
  margin-top: 80px;
}

.knowledge-card-grid--center {
  grid-template-columns: repeat(3, minmax(0, 340px));
  justify-content: center;
}

@media (max-width: 768px) {
  .knowledge-material {
    padding: 0 0 60px;
  }

  .knowledge-material__lead {
    margin: 30px 0 34px;
    line-height: 1.9;
  }

  .knowledge-material__subheading {
    margin-bottom: 22px;
    font-size: 21px;
  }

  .knowledge-material__group {
    margin-top: 40px;
  }

  .knowledge-card-grid--center {
    grid-template-columns: 1fr;
    justify-content: stretch;
  }

  .knowledge-card__text {
    line-height: 1.8;
  }

  .knowledge-flow-arrow {
    margin: 22px auto;
  }

  .knowledge-process-box {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 20px;
  }

  .knowledge-process-box__image {
    max-width: 400px;
    margin: 0 auto;
  }

  .knowledge-process-box__title {
    margin-bottom: 10px;
    font-size: 18px;
  }

  .knowledge-process-box__text {
    margin-bottom: 18px;
    line-height: 1.8;
  }
}

/* ===================================================================
  亜鉛地金について -電気亜鉛と蒸留亜鉛-
=================================================================== */
.knowledge-ingot {
  padding: 0 0 80px;
}

.knowledge-ingot__lead {
  margin: 42px 0 52px;
  font-size: 16px;
  line-height: 1.9;
}

.knowledge-ingot__block + .knowledge-ingot__block {
  margin-top: 56px;
}

.knowledge-ingot__subheading {
  margin: 0 0 28px;
  color: var(--color-sub1);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.5;
}

.knowledge-ingot__text {
  margin-bottom: 28px;
  font-size: 16px;
  line-height: 2;
}

.knowledge-ingot__formula {
  width: 100%;
  max-width: 800px;
  margin: 34px auto 46px;
  padding: 25px 30px;
  background: #EEEEEE;
  color: var(--color-text);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.55;
}

.knowledge-ingot__formula p {
  margin: 0;
  line-height: inherit;
}

.knowledge-ingot__table-wrap {
  width: 100%;
  max-width: 800px;
  margin: 34px auto 0;
}

.knowledge-ingot__table-title {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.6;
  text-align: center;
}

.knowledge-ingot__table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.knowledge-ingot__table {
  width: 100%;
  min-width: 800px;
  table-layout: fixed;
  font-size: 16px;
  line-height: 1.45;
  text-align: center;
}

.knowledge-ingot__table th,
.knowledge-ingot__table td {
  padding: 10px 8px;
  border: 1px solid #CCCCCC;
  vertical-align: middle;
}

.knowledge-ingot__table thead th {
  background: #EEEEEE;
  font-weight: 700;
}

.knowledge-ingot__table tbody th {
  font-weight: 700;
}

.knowledge-ingot__table th:first-child {
  width: 210px;
}

@media (max-width: 768px) {
  .knowledge-ingot {
    padding: 0 0 60px;
  }

  .knowledge-ingot__lead {
    margin: 30px 0 38px;
    line-height: 1.9;
  }

  .knowledge-ingot__block + .knowledge-ingot__block {
    margin-top: 44px;
  }

  .knowledge-ingot__subheading {
    margin-bottom: 22px;
    font-size: 21px;
  }

  .knowledge-ingot__text {
    margin-bottom: 22px;
    line-height: 1.9;
  }

  .knowledge-ingot__formula {
    margin: 26px auto 34px;
    padding: 20px;
    font-size: 16px;
    overflow-wrap: anywhere;
  }

  .knowledge-ingot__table-wrap {
    margin-top: 26px;
  }

  .knowledge-ingot__table-title {
    font-size: 16px;
    text-align: left;
  }

  .knowledge-ingot__table {
    font-size: 16px;
  }
}

/* ===================================================================
  溶融亜鉛メッキとは
=================================================================== */
.knowledge-plating {
  padding: 0 0 80px;
}

.knowledge-plating__list {
  margin-top: 48px;
}

.knowledge-plating__item {
  min-width: 0;
}

.knowledge-plating__item + .knowledge-plating__item {
  margin-top: 48px;
}

.knowledge-plating__title {
  margin: 0 0 20px;
  color: var(--color-sub1);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.5;
}

.knowledge-plating__content {
  display: grid;
  grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
  align-items: center;
  gap: 10px;
}

.knowledge-plating__image {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  margin: 0;
}

.knowledge-plating__image img {
  display: block;
  width: auto;
  max-width: 100%;
  height: 230px;
  object-fit: contain;
}

.knowledge-plating__text {
  margin: 0;
  font-size: 16px;
  line-height: 2;
}

.knowledge-plating__description {
  margin-top: 40px;
}

@media (max-width: 768px) {
  .knowledge-plating {
    padding: 0 0 60px;
  }

  .knowledge-plating__list {
    margin-top: 34px;
  }

  .knowledge-plating__item + .knowledge-plating__item {
    margin-top: 42px;
  }

  .knowledge-plating__title {
    margin-bottom: 18px;
    font-size: 21px;
  }

  .knowledge-plating__content {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .knowledge-plating__image {
    margin: 0;
  }

  .knowledge-plating__image img {
    width: auto;
    max-width: 100%;
    height: 220px;
  }

  .knowledge-plating__text {
    line-height: 1.9;
  }

  .knowledge-plating__description {
    margin-top: 42px;
    line-height: 1.8;
  }

  .knowledge-plating__description p + p {
    margin-top: 18px;
  }
}

/* ===================================================================
  ダイカストとは
=================================================================== */
.knowledge-diecast {
  padding: 0 0 80px;
}

.knowledge-diecast__lead {
  margin: 42px 0 44px;
  font-size: 16px;
  line-height: 1.9;
}

.knowledge-diecast__image {
  width: 100%;
  max-width: 640px;
  margin: 0 auto 34px;
}

.knowledge-diecast__image img {
  display: block;
  width: 100%;
  height: auto;
}

.knowledge-diecast__text {
  margin-bottom: 40px;
}

.knowledge-diecast__text:last-child {
  margin: 40px 0 0;
}

.knowledge-diecast__tables {
  display: grid;
  gap: 48px;
}

.knowledge-table {
  width: 100%;
  max-width: 800px;
  min-width: 0;
  margin: 0 auto;
}

.knowledge-table__title {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.6;
  text-align: center;
}

.knowledge-table__scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.knowledge-table__table {
  width: 100%;
  min-width: 800px;
  table-layout: fixed;
  font-size: 16px;
  line-height: 1.4;
  text-align: center;
}

.knowledge-table__table th,
.knowledge-table__table td {
  padding: 8px 6px;
  border: 1px solid #333333;
  vertical-align: middle;
}

.knowledge-table__table th {
  font-weight: 500;
}

@media (max-width: 768px) {
  .knowledge-diecast {
    padding: 0 0 60px;
  }

  .knowledge-diecast__lead {
    margin: 30px 0 34px;
    line-height: 1.9;
  }

  .knowledge-diecast__image {
    margin-bottom: 28px;
  }

  .knowledge-diecast__text {
    margin-bottom: 36px;
    line-height: 1.9;
  }

  .knowledge-diecast__tables {
    gap: 38px;
  }

  .knowledge-table {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
  }

  .knowledge-table__title {
    font-size: 16px;
    text-align: left;
  }

  .knowledge-table__scroll {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
  }

  .knowledge-table__table {
    width: 800px;
    min-width: 800px;
  }
}

/* ===================================================================
  伸銅とは
=================================================================== */
.knowledge-copper {
  padding: 0 0 80px;
}

.knowledge-copper__content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 600px);
  align-items: center;
  gap: 48px;
  margin-top: 42px;
}

.knowledge-copper__body {
  min-width: 0;
  font-size: 16px;
  line-height: 1.8;
}

.knowledge-copper__body p {
  margin: 0;
}

.knowledge-copper__body p + p {
  margin-top: 12px;
}

.knowledge-copper__image {
  width: 100%;
  max-width: 600px;
  margin: 0;
}

.knowledge-copper__image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.knowledge-copper__note {
  margin: 36px 0 0;
  font-size: 16px;
  line-height: 1.8;
}

@media (max-width: 768px) {
  .knowledge-copper {
    padding:  0 0 60px;
  }

  .knowledge-copper__content {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 30px;
  }

  .knowledge-copper__image {
    grid-row: 1;
    margin: 0 auto;
  }

  .knowledge-copper__body {
    grid-row: 2;
    line-height: 1.8;
  }

  .knowledge-copper__body p + p {
    margin-top: 10px;
  }

  .knowledge-copper__note {
    margin-top: 28px;
    line-height: 1.8;
  }
}

/* ===================================================================
  亜鉛リサイクルの基本用語
=================================================================== */
.knowledge-glossary {
  padding: 0;
}

.knowledge-glossary__lead {
  margin: 42px 0 52px;
  font-size: 16px;
  line-height: 1.95;
}

.knowledge-glossary__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 70px;
  row-gap: 42px;
}

.knowledge-glossary__item {
  min-width: 0;
}

.knowledge-glossary__title {
  margin-bottom: 14px;
  color: #0159A0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
}

.knowledge-glossary__content {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  align-items: start;
  gap: 20px;
}

.knowledge-glossary__image {
  width: 100%;
  max-width: 300px;
  margin: 0;
}

.knowledge-glossary__image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.knowledge-glossary__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
}

.knowledge-glossary__wide-list {
  margin-top: 56px;
}

.knowledge-glossary__wide-item + .knowledge-glossary__wide-item {
  margin-top: 42px;
}

.knowledge-glossary__wide-content {
  display: grid;
  grid-template-columns: minmax(0, 480px) minmax(0, 1fr);
  align-items: start;
  gap: 36px;
}

.knowledge-glossary__wide-image {
  width: 100%;
  max-width: 480px;
  margin: 0;
}

.knowledge-glossary__reference {
  margin-top: 56px;
  text-align: center;
}

.knowledge-glossary__reference-text {
  margin-bottom: 22px;
  font-size: 16px;
  line-height: 1.8;
}

.knowledge-glossary__button {
  padding: 18px 30px;
  border: 1px solid var(--color-main);
}

@media (max-width: 768px) {
  .knowledge-glossary {
    padding: 0;
  }

  .knowledge-glossary__lead {
    margin: 30px 0 38px;
    line-height: 1.9;
  }

  .knowledge-glossary__grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .knowledge-glossary__title {
    margin-bottom: 14px;
    font-size: 20px;
  }

  .knowledge-glossary__content {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .knowledge-glossary__image {
    max-width: 300px;
    margin: 0 auto;
  }

  .knowledge-glossary__text {
    line-height: 1.9;
  }

  .knowledge-glossary__wide-list {
    margin-top: 44px;
  }

  .knowledge-glossary__wide-item + .knowledge-glossary__wide-item {
    margin-top: 38px;
  }

  .knowledge-glossary__wide-content {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .knowledge-glossary__wide-image {
    max-width: 100%;
    margin: 0 auto;
  }

  .knowledge-glossary__reference {
    margin-top: 44px;
  }


  .knowledge-glossary__button {
    width: 100%;
  }
}