/* 記事専用スコープ（共通CSSとの衝突防止） */
.yk-article {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 80px;
  font-family: "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  color: #333333;
  line-height: 1.85;
  font-size: 16px;
  background-color: #ffffff;
  box-sizing: border-box;
}

.yk-article *,
.yk-article *::before,
.yk-article *::after {
  box-sizing: inherit;
}

/* タイトルエリア */
.yk-article-header {
  border-bottom: 3px solid #1a5b8c;
  padding-bottom: 24px;
  margin-bottom: 36px;
}

.yk-category-tag {
  display: inline-block;
  background-color: #1a5b8c;
  color: #ffffff;
  font-size: 14px;
  font-weight: bold;
  padding: 4px 14px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}

.yk-article-title {
  font-size: 28px;
  line-height: 1.4;
  color: #1a5b8c;
  font-weight: bold;
  margin: 0 0 20px;
}

/* 監修者プロフィール枠 */
.yk-doctor-card {
  display: flex;
  align-items: center;
  gap: 24px;
  background-color: #f4f8fb;
  border: 1px solid #d2e3f0;
  border-radius: 8px;
  padding: 20px 24px;
  margin-top: 20px;
}

.yk-doctor-photo {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
  background-color: #e0e0e0;
  border: 3px solid #ffffff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.yk-doctor-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.yk-doctor-info {
  flex: 1;
}

.yk-doctor-role {
  font-size: 14px;
  color: #666666;
  margin-bottom: 4px;
}

.yk-doctor-name {
  font-size: 20px;
  font-weight: bold;
  color: #222222;
  margin-bottom: 6px;
}

.yk-doctor-profile {
  font-size: 13.5px;
  line-height: 1.65;
  color: #555555;
  margin: 0;
}

/* 導入・リード文 */
.yk-intro-section {
  background-color: #fffdf7;
  border-left: 5px solid #f29c38;
  padding: 24px 28px;
  margin-bottom: 48px;
  border-radius: 0 8px 8px 0;
}

.yk-lead-title {
  font-size: 21px;
  font-weight: bold;
  color: #b86000;
  margin-top: 0;
  margin-bottom: 12px;
}

/* 見出しスタイル */
.yk-heading-h2 {
  font-size: 24px;
  color: #1a5b8c;
  border-bottom: 2px solid #1a5b8c;
  padding-bottom: 10px;
  margin-top: 56px;
  margin-bottom: 24px;
  position: relative;
}

.yk-heading-h2::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 24px;
  background-color: #f29c38;
  margin-right: 12px;
  vertical-align: -3px;
  border-radius: 2px;
}

/* 2カラムレイアウト（テキスト＋図版） */
.yk-row-flex {
  display: flex;
  gap: 36px;
  align-items: center;
  margin: 28px 0;
}

.yk-col-text {
  flex: 1.1;
}

.yk-col-image {
  flex: 0.9;
  text-align: center;
}

.yk-col-image img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid #e5e5e5;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.yk-caption {
  font-size: 13px;
  color: #777777;
  margin-top: 8px;
  text-align: center;
}

/* ハイライト文字 */
.yk-marker {
  background: linear-gradient(transparent 60%, #fff1a8 60%);
  font-weight: bold;
}

/* 強調ボックス（要点・まとめ） */
.yk-callout-box {
  background-color: #eef7fc;
  border: 2px solid #bcdbf0;
  border-radius: 10px;
  padding: 28px 32px;
  margin: 44px 0;
}

.yk-callout-title {
  font-size: 21px;
  font-weight: bold;
  color: #0d4a75;
  margin-top: 0;
  margin-bottom: 14px;
}

/* YouTube動画ボックス */
.yk-video-section {
  background: #fdfdfd;
  border: 1px solid #d9e2ec;
  border-radius: 10px;
  padding: 32px 24px;
  margin: 50px 0;
  text-align: center;
}

.yk-video-title {
  font-size: 22px;
  font-weight: bold;
  color: #1a5b8c;
  margin-top: 0;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.yk-video-title::before {
  content: "\25B6";
  display: inline-block;
  color: #e52d27;
  font-size: 30px;
}

.yk-video-desc {
  font-size: 15px;
  color: #555555;
  margin-bottom: 22px;
}

.yk-video-wrapper {
  position: relative;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding-top: 56.25%;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  background-color: #000000;
}

.yk-video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ＝＝＝ 【改善】生活習慣 4分割カード（イラスト拡大仕様） ＝＝＝ */
.yk-lifestyle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.yk-lifestyle-item {
  background-color: #fbfcff;
  border: 1px solid #d8e4ef;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
  transition: transform 0.2s ease;
}

.yk-lifestyle-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(26, 91, 140, 0.08);
}

/* イラスト表示エリア（約150pxで大きく綺麗に表示） */
.yk-lifestyle-thumb {
  width: 150px;
  height: 150px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #ffffff;
  border-radius: 8px;
  padding: 6px;
  border: 1px solid #edf2f7;
}

.yk-lifestyle-thumb img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.yk-lifestyle-body {
  flex: 1;
}

.yk-lifestyle-body h4 {
  margin: 0 0 8px;
  font-size: 18px;
  color: #1a5b8c;
  font-weight: bold;
}

.yk-lifestyle-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: #4a5568;
}

.yk-article ruby rt {
  font-size: 0.65em;
  color: #555;
}

/* ＝＝＝ SP表示（スマホ） ＝＝＝ */
@media screen and (max-width: 768px) {
  .yk-article {
    width: 100%;
    max-width: 100%;
    padding: 20px 16px 50px;
    font-size: 15px;
  }

  .yk-article-title {
    font-size: 22px;
  }

  .yk-doctor-card {
    flex-direction: column;
    text-align: center;
    padding: 16px;
  }

  .yk-doctor-photo {
    width: 80px;
    height: 80px;
  }

  .yk-intro-section {
    padding: 16px;
    margin-bottom: 36px;
  }

  .yk-row-flex {
    flex-direction: column;
    gap: 18px;
  }

  .yk-col-image {
    width: 100%;
  }

  .yk-callout-box {
    padding: 20px 16px;
  }

  /* SP時の生活習慣カード：イラストを上部中央に大きく配置 */
  .yk-lifestyle-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .yk-lifestyle-item {
    flex-direction: column;
    text-align: center;
    padding: 20px 16px;
    gap: 14px;
  }

  .yk-lifestyle-thumb {
    width: 160px;
    height: 160px;
    margin: 0 auto;
  }

  .yk-lifestyle-body h4 {
    font-size: 18px;
  }

  .yk-heading-h2 {
    font-size: 19px;
    margin-top: 40px;
  }

  .yk-video-section {
    padding: 20px 12px;
    margin: 36px 0;
  }

  .yk-video-title {
    font-size: 18px;
  }
}