.column {
  padding: 60px 0 100px;
}

.column__in {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.column-arc,
.column-single {
  flex: 1 1 auto;
  width: auto;
  min-width: 0;
}

.column-arc__catttl {
  margin-bottom: 24px;
  font-size: 24px;
  font-family: 'Noto Serif JP', serif;
}

.column-arc__list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
}

.column-arc__item {
  border: 1px solid #e8e8e8;
  background: #fff;
}

.column-arc__link {
  display: flex;
  color: inherit;
  text-decoration: none;
}

.column-arc__thumb {
  width: 280px;
  min-width: 280px;
}

.column-arc__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.column-arc__body {
  padding: 20px;
}

.column-arc__meta,
.column-single__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.column-arc__meta time,
.column-single__meta time {
  color: #777;
  font-size: 14px;
}

.column-arc__terms,
.column-single__terms {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.column-arc__terms li span,
.column-single__terms li a {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  background: #49b392;
  color: #fff;
  font-size: 12px;
  text-decoration: none;
}

.column-arc__ttl {
  margin-bottom: 8px;
  font-size: 24px;
  font-family: 'Noto Serif JP', serif;
  line-height: 1.5;
}

.column-arc__excerpt {
  color: #555;
  line-height: 1.9;
}

.column-arc__empty {
  border: 1px solid #e8e8e8;
  background: #fff;
  padding: 20px;
}

.column-sd {
  flex: 0 0 260px;
  width: 260px;
  border: 1px solid #e8e8e8;
  background: #fff;
  padding: 20px;
  position: sticky;
  top: 20px;
}

.column-sd__ttl {
  margin-bottom: 14px;
  font-size: 18px;
  font-family: 'Noto Serif JP', serif;
}

.column-sd__list li {
  border-top: 1px solid #f1f1f1;
}

.column-sd__list li:last-child {
  border-bottom: 1px solid #f1f1f1;
}

.column-sd__list li a {
  display: block;
  padding: 10px 0;
  color: inherit;
  text-decoration: none;
}

.column-sd__list li a.is-current {
  color: #49b392;
}

.column-single__ttl {
  margin-bottom: 12px;
  font-size: 36px;
  font-family: 'Noto Serif JP', serif;
  line-height: 1.45;
}

.column-single__fig {
  margin-bottom: 24px;
}

.column-single__fig img {
  width: 100%;
  height: auto;
}

.column-single__content {
  line-height: 1.95;
}

.column-single__content h2 {
  margin: 52px 0 20px;
  padding: 10px 0 10px 16px;
  border-left: 4px solid #49b392;
  background: #f5fbf9;
  font-size: 30px;
  font-family: 'Noto Serif JP', serif;
  line-height: 1.5;
}

.column-single__content h3 {
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid #d9efe8;
  font-size: 24px;
  font-family: 'Noto Serif JP', serif;
  line-height: 1.6;
}

.column-single__content p {
  margin-top: 14px;
}

.column-single__content ul,
.column-single__content ol {
  margin: 16px 0 16px 24px;
}

.column-single__content li {
  margin-top: 8px;
}

.column-single__content table {
  width: 100%;
  margin: 24px 0;
  border-collapse: collapse;
}

.column-single__content table th,
.column-single__content table td {
  border: 1px solid #e2e2e2;
  padding: 10px 12px;
  vertical-align: top;
}

.column-single__content table th {
  background: #f8f8f8;
  width: 24%;
}

.column-single__content .column-note {
  margin-top: 10px;
  color: #666;
  font-size: 13px;
}

.column-single__content .column-summary {
  margin: 24px 0 26px;
  padding: 18px 20px 16px;
  border: 1px solid #cde8de;
  border-radius: 6px;
  background: linear-gradient(180deg, #f7fcfa 0%, #ffffff 100%);
}

.column-single__content .column-summary__ttl {
  margin-bottom: 10px;
  color: #2a8f73;
  font-weight: 700;
  font-size: 18px;
  line-height: 1.6;
}

.column-single__content .column-summary ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.column-single__content .column-summary li {
  position: relative;
  margin-top: 8px;
  padding-left: 22px;
  line-height: 1.8;
}

.column-single__content .column-summary li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #49b392;
}

.column-single__content .column-toc {
  margin: 24px 0 30px;
  padding: 16px 20px;
  border: 1px solid #e5e5e5;
  background: #fff;
}

.column-single__content .column-toc__ttl {
  margin-bottom: 8px;
  font-weight: 700;
}

.column-single__content .column-toc > ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.column-single__content .column-toc > ol > li {
  margin-top: 8px;
}

.column-single__content .column-toc ol ol {
  margin: 8px 0 0 18px;
  padding-left: 12px;
  border-left: 1px solid #e7e7e7;
  list-style: none;
}

.column-single__content .column-toc ol ol li {
  margin-top: 6px;
}

.column-single__content .column-toc a {
  color: inherit;
  text-decoration: none;
}

.column-single__content .column-toc a:hover {
  color: #49b392;
}

.column-single__content img {
  max-width: 100%;
  height: auto;
}

.column-single__back {
  margin-top: 40px;
}

@media (max-width: 1024px) {
  .column__in {
    flex-direction: column;
  }

  .column-arc,
  .column-single,
  .column-sd {
    width: 100%;
  }

  .column-sd {
    position: static;
  }
}

@media (max-width: 810px) {
  .column {
    padding: 40px 0 70px;
  }

  .column-arc__link {
    flex-direction: column;
  }

  .column-arc__thumb {
    width: 100%;
    min-width: 0;
  }

  .column-arc__ttl {
    font-size: 20px;
  }

  .column-single__ttl {
    font-size: 28px;
  }

  .column-single__content h2 {
    margin-top: 40px;
    font-size: 24px;
  }

  .column-single__content h3 {
    font-size: 20px;
  }

  .column-single__content .column-summary {
    padding: 14px 14px 12px;
  }

  .column-single__content .column-summary__ttl {
    font-size: 16px;
  }
}