/* コラム詳細ページ専用 */
* { box-sizing: border-box; }

body.column-page {
  margin: 0;
  color: #252525;
  background: #fff;
  font-family: "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.column-header {
  background: #fff;
  border-bottom: 1px solid #dfe3e8;
}

.column-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 48px, 1080px);
  min-height: 78px;
  margin: 0 auto;
}

.column-header__logo img {
  display: block;
  width: auto;
  height: 48px;
}

.column-header__link {
  color: #264b73;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.column-header__link::before {
  content: "←";
  margin-right: 8px;
}

.column-header__link:hover { text-decoration: underline; }

.column-main {
  padding: 70px 24px 96px;
}

.column-article {
  max-width: 760px;
  margin: 0 auto;
}

.column-article__category {
  display: block;
  margin-bottom: 20px;
  color: #55708c;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
}

.column-article h1 {
  margin: 0;
  color: #182b3d;
  font-family: "Noto Serif JP", serif;
  font-size: 42px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: .02em;
}

.column-article__meta {
  margin: 20px 0 42px;
  padding-bottom: 22px;
  border-bottom: 1px solid #dfe3e8;
  color: #7b858f;
  font-size: 13px;
}

.column-article__lead {
  margin: 0 0 44px;
  color: #3d4853;
  font-size: 18px;
  font-weight: 500;
  line-height: 2;
}

.column-article h2 {
  margin: 58px 0 22px;
  padding-left: 16px;
  border-left: 4px solid #1c5e96;
  color: #183b5c;
  font-size: 27px;
  line-height: 1.6;
}

.column-article h3 {
  margin: 38px 0 16px;
  color: #294b68;
  font-size: 21px;
  line-height: 1.7;
}

.column-article p {
  margin: 0 0 25px;
  font-size: 16px;
  line-height: 2.05;
}

.column-article ul,
.column-article ol {
  margin: 30px 0;
  padding: 4px 0 4px 1.6em;
}

.column-article li {
  margin: 10px 0;
  padding-left: 4px;
  line-height: 1.9;
}

.column-article__note {
  margin-top: 54px;
  padding: 22px 0;
  border-top: 1px solid #dfe3e8;
  border-bottom: 1px solid #dfe3e8;
  color: #5b6570;
  font-size: 13px;
  line-height: 1.9;
}

.column-back {
  margin-top: 48px;
}

.column-back a {
  display: inline-flex;
  align-items: center;
  color: #1d5687;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.column-back a::before {
  content: "←";
  margin-right: 10px;
}

.column-back a:hover { text-decoration: underline; }

.column-footer {
  padding: 30px 20px;
  border-top: 1px solid #dfe3e8;
  color: #707982;
  background: #f8f9fa;
  text-align: center;
  font-size: 12px;
}

@media screen and (max-width: 767px) {
  .column-header__inner {
    width: calc(100% - 32px);
    min-height: 64px;
  }

  .column-header__logo img { height: 38px; }
  .column-header__link { font-size: 12px; }

  .column-main { padding: 42px 20px 68px; }
  .column-article h1 { font-size: 30px; line-height: 1.55; }
  .column-article__meta { margin: 16px 0 32px; }
  .column-article__lead { margin-bottom: 36px; font-size: 16px; line-height: 1.95; }
  .column-article h2 { margin-top: 46px; font-size: 23px; }
  .column-article h3 { font-size: 19px; }
  .column-article p,
  .column-article li { font-size: 15px; }
  .column-back { margin-top: 38px; }
}