@layer page {
  /* Page-specific styles for timeline.html */
  /* ===== タイムライン ===== */
  .tl-outer {
    width: min(calc(100% - 40px), 860px);
    margin-inline: auto;
    padding: 72px 0 80px;
  }
  .tl-wrap {
    position: relative;
    padding-left: 64px;
  }
  .tl-wrap::before {
    content: "";
    position: absolute;
    left: 24px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(
      180deg,
      var(--navy) 0%,
      rgba(26, 58, 82, 0.1) 100%
    );
  }
  .tl-item {
    position: relative;
    margin-bottom: 40px;
  }
  .tl-item:last-child {
    margin-bottom: 0;
  }
  .tl-dot {
    position: absolute;
    left: -52px;
    top: 18px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--navy) 0%, #1a3a52 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(5, 17, 31, 0.28);
    z-index: 1;
    line-height: 1;
  }
  .tl-dot-era {
    font-size: 0.55rem;
    font-weight: 900;
    color: rgba(212, 175, 55, 0.7);
    letter-spacing: 0.06em;
  }
  .tl-dot-year {
    font-size: 1rem;
    font-weight: 900;
    color: var(--gold);
  }
  .tl-dot.highlight {
    background: linear-gradient(135deg, #15803d 0%, #166534 100%);
  }
  .tl-card {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--navy);
    border-radius: var(--radius);
    padding: 24px 28px;
    box-shadow: var(--shadow-sm);
    transition:
      box-shadow 0.2s,
      transform 0.2s;
  }
  .tl-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(2px);
  }
  .tl-card.highlight {
    border-left-color: var(--gold);
  }
  .tl-tag {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.07em;
    color: #73510a;
    background: rgba(212, 175, 55, 0.16);
    padding: 3px 10px;
    border-radius: 999px;
    margin-bottom: 10px;
  }
  .tl-title {
    font-family: "Noto Serif JP", serif;
    font-size: 1.08rem;
    font-weight: 900;
    color: var(--navy);
    margin-bottom: 10px;
    line-height: 1.4;
  }
  .tl-desc {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.85;
    margin-bottom: 0;
  }
  .tl-note {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--line);
    font-size: 0.86rem;
    color: var(--text-soft);
    line-height: 1.75;
  }
  /* ===== インサイトボックス ===== */
  .insight-box {
    background: linear-gradient(135deg, var(--navy) 0%, #1a3a52 100%);
    border-radius: var(--radius);
    padding: 44px 48px;
    margin-top: 0;
  }
  .insight-box h3 {
    font-family: "Noto Serif JP", serif;
    font-size: 1.35rem;
    font-weight: 900;
    color: var(--gold-lt, #fcd34d);
    margin-bottom: 20px;
    line-height: 1.4;
  }
  .insight-box p {
    font-size: 0.96rem;
    line-height: 1.95;
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: 14px;
  }
  .insight-box p:last-child {
    margin-bottom: 0;
  }
  /* ===== キーカード ===== */
  .key-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 18px;
    margin-top: 40px;
  }
  .key-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
  }
  .key-icon {
    font-size: 2rem;
    margin-bottom: 12px;
  }
  .key-lbl {
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    color: var(--text-soft);
    text-transform: uppercase;
    margin-bottom: 6px;
  }
  .key-val {
    font-family: "Noto Serif JP", serif;
    font-size: 1.02rem;
    font-weight: 900;
    color: var(--navy);
    line-height: 1.45;
  }
  /* ===== 関連リンク ===== */
  .rel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
    margin-top: 28px;
  }
  .rel-card {
    display: block;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px 20px;
    text-decoration: none;
    transition:
      box-shadow 0.2s,
      transform 0.2s;
  }
  .rel-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }
  .rel-card-kicker {
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    color: #73510a;
    text-transform: uppercase;
    margin-bottom: 6px;
  }
  .rel-card-title {
    font-family: "Noto Serif JP", serif;
    font-size: 0.97rem;
    font-weight: 900;
    color: var(--navy);
    margin-bottom: 6px;
  }
  .rel-card-desc {
    font-size: 0.83rem;
    color: var(--text-soft);
    line-height: 1.6;
  }
  @media (max-width: 680px) {
    .tl-wrap {
      padding-left: 52px;
    }
    .tl-dot {
      left: -44px;
      width: 46px;
      height: 46px;
    }
    .tl-dot-year {
      font-size: 0.88rem;
    }
    .insight-box {
      padding: 28px 22px;
    }
    .key-grid {
      grid-template-columns: 1fr;
    }
  }
}