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/*                                                                     */
/*              colum/ 共通 CSS                                        */
/*                                                                     */
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/* ===== 記事ヒーロー画像 ===== */

.colum-hero {
  width: 95%;
  max-width: 1200px;
  margin: 0 auto 70px;
}

.colum-hero img {
  display: block;
  width: 800px;
  height: auto;
  border-radius: 10px;
}


/* ===== コンテンツ幅・余白 ===== */

.colum-body {
  width: 95%;
  max-width: 1200px;
  margin: 0 auto;
}


/* ===== リード文 ===== */

.colum-lead p {
  font-family: "Noto Sans", sans-serif;
  font-weight: 400;
  font-size: 1rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: #222;
}


/* ===== 各セクション ===== */

.colum-section p {
  font-family: "Noto Sans", sans-serif;
  font-weight: 400;
  font-size: 1rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: #222;
  margin-bottom: 1em;
}

.colum-section p:last-child {
  margin-bottom: 0;
}


/* ===== リスト ===== */

.colum-list {
  padding-left: 1.5em;
  margin-top: 1em;
  margin-bottom: 1em;
}

.colum-list li {
  font-family: "Noto Sans", sans-serif;
  font-weight: 400;
  font-size: 1rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: #222;
}


/* ===== まとめブロック ===== */

.colum-summary {
  margin-top: 1.5em;
  padding: 1.5em 2em;
  background: #f7f7f7;
  border-left: 3px solid #222;
}

.colum-summary p {
  font-family: "Noto Sans", sans-serif;
  font-weight: 400;
  font-size: 1rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: #222;
  margin-bottom: 0;
}


/* ===== 公開日 ===== */

.colum-date {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid #ddd;
}

.colum-date p {
  font-family: "Noto Sans", sans-serif;
  font-weight: 400;
  font-size: 0.85rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: #666;
  text-align: right;
}


/* ===== リンク ===== */

.colum-section a {
  color: #222;
  text-decoration: underline;
}

.colum-section a:hover {
  text-decoration: none;
}


/* ===== 記事カード一覧 ===== */

.colum-list-wrap {
  width: 95%;
  max-width: 1200px;
  margin: 0 auto;
}

.colum-cards {
  display: flex;
  flex-direction: column;
  gap: 50px;
}

.colum-card {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  text-decoration: none;
  color: #222;
  padding-bottom: 50px;
  border-bottom: 1px solid #ddd;
  transition: opacity 0.2s ease;
}

.colum-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.colum-card:hover {
  opacity: 0.7;
}

.colum-card-img {
  flex-shrink: 0;
  width: 280px;
}

.colum-card-img img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.colum-card-body {
  flex: 1;
}

.colum-card-date {
  font-family: "Noto Sans", sans-serif;
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.05em;
  color: #999;
  margin-bottom: 12px;
}

.colum-card-title {
  font-family: "Noto Sans", sans-serif;
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: #222;
  margin-bottom: 16px;
}

.colum-card-excerpt {
  font-family: "Noto Sans", sans-serif;
  font-size: 0.9rem;
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: #555;
}

.colum-card-more {
  display: inline-block;
  margin-top: 16px;
  font-family: "Noto Sans", sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: #222;
  border-bottom: 1px solid #222;
  padding-bottom: 2px;
}


/* ===== スマホ（カード一覧） ===== */

@media (max-width: 767px) {

  .colum-list-wrap {
    width: 90%;
  }

  .colum-card {
    flex-direction: column;
    gap: 20px;
    padding-bottom: 40px;
  }

  .colum-card-img {
    width: 100%;
  }

}


/* ===== 前後ナビ ===== */

.colum-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid #ddd;
  gap: 20px;
}

.colum-nav-prev,
.colum-nav-next {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #222;
  font-family: "Noto Sans", sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.05em;
  transition: opacity 0.2s ease;
  max-width: 45%;
}

.colum-nav-prev:hover,
.colum-nav-next:hover {
  opacity: 0.6;
}

.colum-nav-next {
  margin-left: auto;
  text-align: right;
  flex-direction: row-reverse;
}

.colum-nav-arrow {
  display: inline-block;
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-top: 2px solid #222;
  border-right: 2px solid #222;
}

.colum-nav-prev .colum-nav-arrow {
  transform: rotate(-135deg);
}

.colum-nav-next .colum-nav-arrow {
  transform: rotate(45deg);
}

.colum-nav-label {
  font-size: 0.75rem;
  color: #999;
  letter-spacing: 0.05em;
  display: block;
  line-height: 1.4;
}


/* ===== スマホ ===== */

@media (max-width: 767px) {

  .colum-hero {
    width: 90%;
    margin-bottom: 50px;
  }

  .colum-hero img {
    width: 100%;
    border-radius: 8px;
  }

  .colum-body {
    width: 90%;
  }

  .colum-summary {
    padding: 1.2em 1.2em;
  }

  .colum-date {
    margin-top: 40px;
    padding-top: 20px;
  }

  .colum-date p {
    text-align: left;
  }

  .colum-nav {
    flex-direction: column;
    gap: 16px;
  }

  .colum-nav-prev,
  .colum-nav-next {
    max-width: 100%;
  }

  .colum-nav-next {
    margin-left: 0;
    flex-direction: row;
    text-align: left;
  }

}