.element-card .demo {
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
  }

/* Periodic table tile demo */
  .demo-periodic {
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: center;
    padding: 10px;
  }

  .pt-tile {
    width: 110px; height: 130px;
    background: white;
    border: 1px solid #C7CCD2;
    padding: 12px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s;
    cursor: pointer;
  }

  .pt-tile:hover {
    border-color: #0B5FAE;
    background: linear-gradient(180deg, white 90%, rgba(11, 95, 174, 0.04) 100%);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -8px rgba(11, 95, 174, 0.2);
  }

  .pt-tile .pt-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: #6B7280;
  }

  .pt-tile .pt-symbol {
    font-family: 'Fraunces', serif;
    font-size: 36px;
    font-weight: 400;
    color: #073B6E;
    line-height: 1;
  }

  .pt-tile .pt-name {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #6B7280;
  }
  .pt-p{ text-align: center;}