body {
    font-family: 'Quicksand', sans-serif;
    background-color: #000000;
    color: #E2E8F0;
  }

  .main-container {
    width: 100%;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 2.5rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  .card-area {
    background-color: rgba(30, 41, 59, 0.5);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 1px solid #334155;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .primary-button {
    background-color: #00A389;
    transition: all 0.25s ease-in-out;
  }

  .primary-button:hover {
    background-color: #008775;
    box-shadow: 0 4px 10px rgba(0, 163, 137, 0.4);
    transform: translateY(-2px);
  }

  .primary-button:active {
    transform: scale(0.98);
  }

  .label-text {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #CBD5E1;
  }

  .input-style {
    background-color: #1E293B;
    border-color: #475569;
    transition: border-color 0.3s, box-shadow 0.3s;
    color: #FFFFFF;
    font-size: 0.9rem;
  }

  .input-style:focus {
    outline: none;
    border-color: #00A389;
    box-shadow: 0 0 0 3px rgba(0, 163, 137, 0.5);
  }

  .footer-attribution {
    margin-top: 2rem;
    text-align: center;
    color: #64748B;
    font-size: 0.75rem;
  }

  .footer-attribution a {
    color: #00A389;
    transition: color 0.15s;
  }

  .footer-attribution a:hover {
    color: #008775;
  }

  .select-style {
    background-color: #1E293B;
    border-color: #475569;
    transition: border-color 0.3s, box-shadow 0.3s;
    color: #FFFFFF;
    cursor: pointer;
  }

  .select-style:focus {
    outline: none;
    border-color: #00A389;
    box-shadow: 0 0 0 3px rgba(0, 163, 137, 0.5);
  }

  #strength-bar {
    height: 10px;
    border-radius: 5px;
    width: 0%;
    transition: width 0.3s, background-color 0.3s;
  }

  .bg-red-500 { background-color: #EF4444; }
  .bg-yellow-500 { background-color: #F59E0B; }
  .bg-blue-500 { background-color: #3B82F6; }
  .bg-green-500 { background-color: #10B981; }
  .text-red-400 { color: #F87171; }
  .text-yellow-400 { color: #FBBF24; }
  .text-blue-400 { color: #60A5FA; }
  .text-green-400 { color: #34D399; }

  #eye-open, #eye-closed {
    transition: opacity 0.2s;
  }

  #qrcode-container {
    min-height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #1E293B;
    padding: 2rem;
    border-radius: 0.5rem;
    border: 1px solid #334155;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.5s ease-out;
  }

  .qrcode-ready {
    opacity: 1 !important;
    transform: translateY(0) !important;
  }

  .placeholder-text {
    color: #94A3B8;
    text-align: center;
    font-size: 0.875rem;
  }

  @keyframes fade-in {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
  }

  .qr-canvas-fade {
    animation: fade-in 0.4s ease-out;
  }

  .form-check-input:checked {
    background-color: #00A389;
    border-color: #00A389;
  }

  .form-range::-webkit-slider-thumb {
    background-color: #00A389;
  }

  .form-range::-moz-range-thumb {
    background-color: #00A389;
  }

  @media (min-width: 1280px) {
    .main-container {
      max-width: 1400px;
    }
  }

  @media (min-width: 1536px) {
    .main-container {
      max-width: 1600px;
    }
  }

  .home-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  @media (min-width: 640px) {
    .home-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .home-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  @media (min-width: 1280px) {
    .home-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }

  .tool-card {
    transition: all 0.3s ease;
    height: 100%;
  }

  .tool-card:hover {
    border-color: #00A389;
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -5px rgba(0, 163, 137, 0.2);
  }

  #global-message-box {
    transition: all 0.3s ease;
  }

  .input-style[data-code="true"],
  textarea.input-style[data-code="true"] {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
  }

  .file-upload-box {
    border: 2px dashed #475569;
    background-color: #1E293B;
    cursor: pointer;
    transition: border-color 0.3s;
  }

  .file-upload-box:hover {
    border-color: #00A389;
  }