.single-content {
  background-color: #fff;
  padding: 32px;
}

.single-header {
  margin-bottom: 40px;
}

.imported-article-image {
  margin: 0 0 40px;
}

.imported-article-image__media {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.single-title {
  font-size: 32px;

  @media (max-width: 768px) {
    font-size: 24px;
  }
}

.single-header .publish-date {
  font-size: 14px;
}

.single-header .tag-list {
  display: flex;
  gap: 8px;
}

.single-header .tag-list .tag-link {
  display: flex;
  align-items: center;
  font-size: 14px;
}

.single-header .tag-list .tag-link a {
  text-decoration: none;
  display: inline-block;
  margin-top: 2px;
}

.single-header .tag-list .tag-link a:hover {
  text-decoration: underline;
}

.single-content h2 {
  font-size: 24px;
  line-height: 1.4;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding: 0 0 0 14px;
  border-left: 5px solid #0c77c1;

  @media (max-width: 768px) {
    font-size: 21px;
    margin-top: 2rem;
  }
}

.yarpp-related a {
  font-weight: 400 !important;
  display: block;
  margin-bottom: 8px;
}

.single-content {
  font-size: 17px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;

  @media (max-width: 768px) {
    font-size: 16px;
  }
}

.single-content p {
  line-height: 1.95;
  margin-bottom: 1.4rem;
}

/* リスト: reset.css で消えた行頭記号・字下げ・行間を本文だけ復活 */
.single-content ul,
.single-content ol {
  margin: 0 0 1.6rem;
  padding-left: 1.5em;
}

.single-content ul {
  list-style: disc;
}

.single-content ol {
  list-style: decimal;
}

.single-content li {
  line-height: 1.9;
  margin-bottom: 0.6em;
}

.single-content li::marker {
  color: #0c77c1;
}

.wp-block-button {
  margin-top: 20px;
  margin-bottom: 20px;
}

.btn-back {
  margin: 24px auto;
  text-align: center;
}

.btn-back a {
  background-color: transparent;
  text-decoration: none;
}

.wp-block-button .wp-block-button__link {
  background-color: #32373c;
}

@media screen and (max-width: 767px) {
  .single-content {
    background-color: #fff;
    padding: 32px 16px;
  }

  .single-title {
    font-size: 20px;
    margin-bottom: 8px;
  }
}

/* 関連記事（YARPP）: リストの「・」を消し、サムネに対して文字を小さく、
   狭いカラムでは自動的に2〜3列に折り返す。 */
.single-content .related-post {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-5) var(--space-4);
  margin: var(--space-5) 0 0;
  padding: 0;
}

.single-content .related-post li {
  width: auto;
  margin: 0;
  line-height: 1.45;
  list-style: none;
}

.related-post li a {
  text-decoration: none;
  color: inherit;
}

.related-post li > a:first-child {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
  background: var(--color-surface);
}

.related-post .thumb-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.45s var(--ease);
}

.related-post li > a:first-child:hover .thumb-img {
  transform: scale(1.05);
}

.related-post li > a:last-child {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: var(--step--1);
  line-height: 1.45;
  color: var(--color-ink);
  transition: color var(--dur) var(--ease);
}

.related-post li > a:last-child:hover {
  color: var(--color-accent);
}

@media screen and (max-width: 767px) {
  .single-content .related-post {
    grid-template-columns: repeat(2, 1fr);
  }
}

.wp-block-embed-youtube iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: unset;
}

.full-width img {
  width: 100% !important;
}

.yarpp {
  margin-top: 80px !important;
}

.instructor-comment {
  padding: 24px;
  background-color: #eee;
  border-radius: 12px;

  img {
    width: 100%;
    aspect-ratio: 1 / 1 !important;
    border-radius: 300px;
    object-fit: cover;
    object-position: top center;
  }

  a {
    text-decoration: none;
    display: inline-block;
    padding: 0 20px;
    line-height: 44px;
    height: 44px;
    text-align: center;
    background-color: #0c77c1;
    color: #fff;
  }
}

.lesson-link {
  text-align: center;
  a {
    text-decoration: none;
    display: inline-block;
    padding: 0 20px;
    min-width: 300px;
    line-height: 56px;
    height: 56px;
    text-align: center;
    background-color: #32373c;
    color: #fff;
    font-size: 20px;
    font-weight: 600;
  }
}

.lesson-publish-label {
  display: inline-block;
  margin-bottom: 24px !important;
  padding: 4px 12px;
  border-radius: 999px;
  background-color: #eef5fa;
  color: #0c77c1;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6 !important;
}

.single-content .lesson-section-heading {
  position: relative;
  margin: 56px 0 18px;
  padding: 0;
  border: 0; /* 左ボーダー(h2継承)・下ボーダーの両方を解除 */
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-2);
  line-height: 1.3;
  color: var(--color-ink);
}

/* ボーダーの代わりに上に短いアクセントバー */
.single-content .lesson-section-heading::before {
  content: '';
  display: block;
  width: 32px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--color-accent);
  border-radius: 2px;
}

.lesson-cta {
  margin-top: 48px;
  padding: 32px;
  border-radius: 12px;
  background-color: #f5f7f9;
  text-align: center;
}

.single-content .lesson-cta__title {
  margin: 0 0 12px;
  padding: 0;
  border: 0; /* h2継承の左ボーダーを解除 */
  font-size: 24px;
}

.lesson-cta__actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 24px 0 0 !important;
}

.lesson-cta__button {
  display: inline-flex;
  min-height: 52px;
  padding: 10px 24px;
  align-items: center;
  justify-content: center;
  border: 2px solid #0c77c1;
  border-radius: 6px;
  background-color: #0c77c1;
  color: #fff;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
}

.lesson-cta__button:hover {
  opacity: 0.85;
}

.lesson-cta__button--secondary {
  background-color: #fff;
  color: #0c77c1;
}

.youtube-link {
  text-align: center;
  a {
    display: inline-block;
    margin: 0 auto;
    text-decoration: none;
    padding: 8px 20px;
    line-height: 26px;
    text-align: center;
    background-color: #ff0234;
    color: #fff;
    font-weight: 600;
  }
}

:where(.wp-block-columns) {
  margin-bottom: 3.75em !important;
}

@media screen and (max-width: 767px) {
  .single-content .lesson-section-heading,
  .single-content .lesson-cta__title {
    font-size: 20px;
  }

  .lesson-cta {
    padding: 24px 16px;
  }

  .lesson-cta__actions {
    flex-direction: column;
  }
}

/* ============================================================
   記事詳細 スプリットレイアウト
   左：代表画像（固定／スクロールしない） 右：本文（スクロール）
   本文ブロックの既存スタイルは温存し、外枠だけ上書きする。
   ============================================================ */
.article-detail {
  padding: 0;
}

.article-split {
  display: grid;
  grid-template-columns: 42% 58%;
  align-items: start;
}

/* 左：sticky で画面に残る。画像はトリミングせず（contain）マット上に額装風 */
.article-split__media {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  display: flex;
  align-items: flex-start; /* 中央寄せをやめ、タイトルと上端を揃える */
  justify-content: center;
  padding: var(--space-9) clamp(var(--space-5), 3vw, var(--space-8)) var(--space-7);
  background: linear-gradient(160deg, var(--color-surface) 0%, var(--color-surface-2) 100%);
}

.article-hero {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
}

.article-hero--empty {
  width: 100%;
  height: 56%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-paper);
  box-shadow: var(--shadow-1);
}

.article-hero--empty span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-0);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* 右：本文カラム */
.article-split__content {
  min-width: 0;
  padding: var(--space-9) clamp(var(--space-5), 4vw, var(--space-8)) var(--space-10);
}

.article-head {
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-line);
}

.article-head .eyebrow {
  margin-bottom: var(--space-3);
}

.article-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-3);
  line-height: 1.25;
  letter-spacing: 0.005em;
  margin: 0;
  color: var(--color-ink);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-4);
  font-size: var(--step--1);
  color: var(--color-muted);
}

.article-meta a {
  color: inherit;
  text-decoration: none;
}

.article-meta a:hover {
  color: var(--color-accent);
}

/* 本文 .single-content の外枠だけ上書き（白箱/中央寄せ/最大幅を解除） */
.article-detail .single-content {
  max-width: none;
  margin: 0;
  padding: 0;
  background: transparent;
}

/* 記事末CTA */
.article-cta {
  margin-top: var(--space-9);
  padding: var(--space-7);
  border-radius: var(--radius-lg);
  background: radial-gradient(140% 130% at 50% 0%, #26262c 0%, var(--color-ink) 62%);
  color: var(--color-paper);
  text-align: center;
}

.article-cta__lead {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 var(--space-2);
}

.article-detail .article-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-2);
  line-height: 1.2;
  margin: 0 0 var(--space-2);
  padding: 0;
  border: 0;
}

.article-cta__desc {
  font-size: var(--step-0);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 var(--space-5);
}

.article-detail .btn-back {
  margin: var(--space-7) 0 0;
  text-align: left;
}

@media screen and (max-width: 900px) {
  .article-split {
    grid-template-columns: 1fr;
  }

  .article-split__media {
    position: static;
    height: auto;
    padding: var(--space-5) 16px 0;
    background: none;
  }

  .article-hero {
    max-height: 64vh;
    margin-inline: auto;
  }

  .article-hero--empty {
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .article-split__content {
    padding: var(--space-6) 16px var(--space-8);
  }

  .article-title {
    font-size: var(--step-2);
  }
}