:root {
  --navy: #17324a;
  --ink: #203246;
  --muted: #7b8da2;
  --line: #a9bacf;
  --container-narrow: min(960px, 88vw);
}

.container-narrow {
  width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

/* 見出し */
.news-wrap {
  padding-top: clamp(80px, 18vw, 120px);
}
.news-heading {
  text-align: center;
  font-weight: 800;
  color: var(--navy);
  font-size: clamp(24px, 4vw, 40px);
  margin: 40px 0 10px;
}

/* 日付・タイトル */
.news-date {
  color: #3a4d63;
  margin: 16px 0 8px;
}
.news-title {
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 24px);
  color: #1a2c3f;
  padding-bottom: 8px;
  border-bottom: 4px solid #e6ecf4;
  margin: 0 0 18px;
}

/* アイキャッチ */
.news-figure {
  margin: 26px auto;
  border: 2px solid var(--line);
  background: #fff;
}
.news-figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* 本文 */
.news-content {
  color: var(--ink);
  line-height: 1.9;
  margin: 0 auto 24px;
}
.news-content p {
  margin: 0 0 1em;
}
.news-content img {
  max-width: 100%;
  height: auto;
}

/* 戻るボタン */
.news-back {
  display: flex;
  justify-content: center;
  margin: 28px 0 60px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--navy);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 14px 40px;
  border-radius: 999px;
  min-width: clamp(240px, 38vw, 360px);
  text-align: center;
}
.btn-lg {
  padding: 16px 48px;
  font-size: 18px;
}
.btn-primary:hover {
  opacity: 0.92;
}

@media (max-width: 640px) {
  :root {
    --container-narrow: min(640px, 94vw);
  }
  .news-wrap {
    padding-top: clamp(96px, 24vw, 140px);
  }
  .news-heading {
    margin: 32px 0 8px;
  }
  .news-back {
    margin: 24px 0 48px;
  }
  .news-back .btn-primary {
    width: 100%;
    max-width: 240px;
    padding: 12px 24px;
    min-width: auto;
    font-size: 0.75rem;
  }
}