@media (max-width: 767px) {
    /* 修正文章頁面左右間距 */
    section.section-sm .container {
      padding-left: 24px !important;
      padding-right: 24px !important;
    }
  }

@media (max-width: 767px) {
    .content h1 { font-size: 1.5rem !important; }
    .content h2 { font-size: 1.35rem !important; }
    .content h3 { font-size: 1.15rem !important; }
    .content h4 { font-size: 1rem !important; }
  }

  .post-title {
    font-size: 1.8rem;
    line-height: 1.4;
  }
  
  @media (max-width: 767px) {
    .post-title {
      font-size: 1.1rem !important;
      line-height: 1.4 !important;
    }
  }

  @media (max-width: 767px) {
    .btn-back-custom {
      font-size: 14px !important;
      padding: 5px 12px !important;
    }
  }

  @media (max-width: 767px) {
    .nav-item {
      max-width: 45% !important;
    }
    
    .nav-title {
      font-size: 0.9rem !important;
      -webkit-line-clamp: 3 !important; /* 改成最多3行 */
    }
    
    .nav-label {
      font-size: 0.85rem !important;
    }
  }