.coins-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 1rem;
    background: #1C1D29;
    border-radius: 8px;
    color: #E4E4E7;
    font-family: sans-serif;
  }
  .coins-container h4 {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: 0.5rem;
  }
  .coins-container p.rate {
    text-align: center;
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: #FFD100;
  }
  .coin-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  .coin-card {
    position: relative;
    padding: 1rem;
    background: #23253A;
    border: 2px solid transparent;
    border-radius: 6px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
  }
  .coin-card:hover {
    background: #2E2F4B;
  }
  .coin-card input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
  }
  .coin-card.selected {
    border-color: #FFD100;
    background: #1C1D29;
  }
  .coin-card .coins {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
  }
  .coin-card .price {
    font-size: 1rem;
    color: #E4E4E7;
  }
  .summary {
    text-align: center;
    margin-bottom: 1rem;
  }
  .summary span {
    font-size: 1.25rem;
    color: #FFD100;
  }
  .vs-btn {
    display: block;
    width: 100%;
    padding: 0.75rem;
    background: #FFD100;
    color: #1C1D29;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
  }
  .vs-btn:hover {
    background: #e0b500;
  }