.dataset-download-section {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin: 1rem 0 1.6rem;
  }
  
  .dataset-download-group {
    padding: 1rem;
    border: 1px solid #e0e3ee;
    border-radius: 0.5rem;
    background: #fafbff;
  }
  
  .dataset-download-title {
    margin-bottom: 1.2rem;
    padding-left: 0.55rem;
    border-left: 4px solid #3f51b5;
    font-size: 1.08rem;
    font-weight: 800;
    color: #2c3e50;
    line-height: 1.3;
  }
  
  .dataset-download-subtitle {
    margin: 0.9rem 0 0.45rem;
    color: #2c3e50;
    font-size: 0.88rem;
    font-weight: 700;
  }
  
  .dataset-download-box {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    width: 100%;
  }
  
  .dataset-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-width: 0;
    padding: 0.65rem 1.1rem;
    border-radius: 0.35rem;
    background: #f1f3f8;
    color: #3f51b5 !important;
    font-weight: 600;
    text-decoration: none !important;
    border: 1px solid #e0e3ee;
    transition: all 0.15s ease;
  }
  
  .dataset-download-btn:hover {
    background: #3f51b5;
    color: #ffffff !important;
    border-color: #3f51b5;
  }
  
  .dataset-download-btn-disabled {
    color: #999999 !important;
    background: #f2f2f2;
    border-color: #e5e5e5;
    cursor: not-allowed;
    pointer-events: none;
  }
  
  .dataset-download-btn-disabled:hover {
    color: #999999 !important;
    background: #f2f2f2;
    border-color: #e5e5e5;
  }
  
  @media screen and (max-width: 768px) {
    .dataset-download-section {
      grid-template-columns: 1fr;
    }
  
    .dataset-download-box {
      grid-template-columns: 1fr;
    }
  
    .dataset-download-btn {
      width: 100%;
    }
  }
  
  .filter-bar {
    display: flex;
    flex-wrap: wrap; 
    width: 100%;    
    margin-bottom: 25px;  
    padding: 10px 0;
    
    background: var(--md-code-bg-color);
    border: 1px solid var(--md-default-fg-color--lightest);
    border-radius: 8px; 
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
  }
  .filter-group {
    flex: 1;          
    display: flex;       
    align-items: center;  
    justify-content: center; 
    
    min-width: 200px;
    border-right: 1px solid var(--md-default-fg-color--lightest); 
  }
  .filter-group:last-child {
    border-right: none;
  }
  .filter-label {
    font-weight: 600;     
    font-size: 0.85rem;  
    color: var(--md-default-fg-color--light);
    margin-right: 10px;   
    white-space: nowrap;    
  }
  .filter-select {
    padding: 6px 12px;  
    min-width: 200px; 
    
    font-size: 0.9rem;
    color: var(--md-default-fg-color);
    background-color: var(--md-default-bg-color);
    
    border: 1px solid var(--md-default-fg-color--lightest);
    border-radius: 4px;
    cursor: pointer;
    outline: none;    
    transition: border-color 0.2s;
  }
  .filter-select:hover {
    border-color: var(--md-primary-fg-color);
  }
  
  .data-card {
    display: flex;
    background: var(--md-default-bg-color);
    border: 1px solid var(--md-default-fg-color--lightest);
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
    transition: all 0.2s ease;
    min-height: 310px; 
  }
  .data-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-color: var(--md-primary-fg-color);
  }
  .card-preview {
    width: 700px;
    height: 365px;
    background: #f0f0f0;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-right: 1px solid var(--md-default-fg-color--lightest);
    flex-shrink: 0;
  }
  .card-preview h3 {
    margin: 0 0 10px 0;
    font-size: 1.0rem;
    font-weight: 700;
    color: var(--md-typeset-color);
  }
  .card-preview video {
    width: 100%;
    height: 75%;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    object-fit: fill;
    display: block;
  }
  .card-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  .tab-header {
    display: flex;
    border-bottom: 1px solid var(--md-default-fg-color--lightest);
    background: var(--md-code-bg-color);
  }
  .tab-btn {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--md-default-fg-color--light);
    border: none;
    background: transparent;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
  }
  .tab-btn:hover {
    color: var(--md-primary-fg-color);
    background: rgba(0,0,0,0.02);
  }
  .tab-btn.active {
    color: var(--md-primary-fg-color);
    border-bottom: 2px solid var(--md-primary-fg-color);
    background: var(--md-default-bg-color);
  }
  .tab-content {
    padding: 15px;
    flex: 1;
    display: none; 
    animation: fadeIn 0.3s ease;
  }
  .tab-content.active {
    display: block;
  }
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .links-list {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
  }
  .link-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background-color: var(--md-code-bg-color);
    border-radius: 4px;
    text-decoration: none !important;
    color: var(--md-typeset-a-color) !important;
    font-size: 0.8rem;
    border: 1px solid transparent;
    transition: all 0.2s;
  }
  .link-item:hover {
    background-color: var(--md-accent-fg-color--transparent);
    border-color: var(--md-accent-fg-color);
    transform: translateX(2px);
  }
  .link-size {
    font-size: 0.7rem;
    color: var(--md-default-fg-color--light);
    background: rgba(0,0,0,0.05);
    padding: 1px 5px;
    border-radius: 3px;
  }
  @media screen and (max-width: 768px) {
    .data-card { flex-direction: column; }
    .card-preview { width: 100%; border-right: none; border-bottom: 1px solid #eee; }
    .links-list { grid-template-columns: 1fr; }
  }