:root {
    --cec-primary: rgb(139, 92, 246);
    --cec-primary-hover: rgb(124, 58, 202);
    --cec-border: rgb(226, 232, 240);
    --cec-border-dark: rgb(51, 65, 85);
    --cec-bg-light: rgb(248, 250, 252);
    --cec-bg-dark: rgb(15, 23, 42);
    --cec-text-primary: rgb(30, 41, 59);
    --cec-text-secondary: rgb(71, 85, 105);
    --cec-text-light: rgb(241, 245, 249);
  }

  .cec-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
  }

  .cec-converter-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
  }

  .theme-dark .cec-converter-card {
    background: rgba(15, 23, 42, 0.6);
    border-color: rgba(255, 255, 255, 0.05);
  }

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

  @media (min-width: 768px) {
    .cec-input-grid {
      grid-template-columns: 1fr 1fr;
    }
  }

  .cec-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .cec-input-label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--cec-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .theme-dark .cec-input-label {
    color: rgb(148, 163, 184);
  }

  .cec-csv-textarea {
    width: 100%;
    height: 200px;
    background: white;
    border: 1px solid var(--cec-border);
    border-radius: 12px;
    padding: 1rem;
    font-size: 0.875rem;
    color: var(--cec-text-primary);
    resize: vertical;
    transition: all 0.2s;
  }

  .theme-dark .cec-csv-textarea {
    background: rgb(2, 6, 23);
    border-color: rgb(30, 41, 59);
    color: var(--cec-text-light);
  }

  .cec-csv-textarea:focus {
    outline: none;
    border-color: var(--cec-primary);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
  }

  .cec-drop-zone {
    border: 2px dashed var(--cec-border);
    border-radius: 12px;
    height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    background: rgba(248, 250, 252, 0.5);
  }

  .theme-dark .cec-drop-zone {
    border-color: var(--cec-border-dark);
    background: rgba(30, 41, 59, 0.2);
  }

  .cec-drop-zone:hover,
  .cec-dragover {
    border-color: var(--cec-primary);
    background: rgba(139, 92, 246, 0.05);
  }

  .cec-drop-zone svg {
    color: var(--cec-primary);
  }

  .cec-drop-zone span {
    font-size: 0.875rem;
    color: rgb(100, 116, 139);
    font-weight: 500;
  }

  .cec-options-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
  }

  .theme-dark .cec-options-row {
    border-top-color: rgba(255, 255, 255, 0.05);
  }

  .cec-option-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    position: relative;
    user-select: none;
    padding: 0.5rem 0.75rem;
    border-radius: 12px;
    transition: background-color 0.2s;
  }

  .cec-option-item:hover {
    background: rgba(139, 92, 246, 0.05);
  }

  .cec-option-item input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--cec-border);
    border-radius: 6px;
    background: white;
    cursor: pointer;
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .theme-dark .cec-option-item input[type="checkbox"] {
    background: rgb(15, 23, 42);
    border-color: var(--cec-border-dark);
  }

  .cec-option-item input[type="checkbox"]:checked {
    background: var(--cec-primary);
    border-color: var(--cec-primary);
    box-shadow: 0 4px 6px -1px rgba(139, 92, 246, 0.2);
  }

  .cec-option-item input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
  }

  .cec-option-item span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--cec-text-secondary);
  }

  .theme-dark .cec-option-item span {
    color: rgb(148, 163, 184);
  }

  .cec-option-item input[type="checkbox"]:checked + span {
    color: rgb(88, 28, 135);
  }

  .theme-dark .cec-option-item input[type="checkbox"]:checked + span {
    color: rgb(196, 181, 253);
  }

  .cec-results-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .cec-result-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--cec-border);
  }

  .theme-dark .cec-result-tabs {
    border-bottom-color: rgb(30, 41, 59);
  }

  .cec-tab-btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: rgb(100, 116, 139);
    background: transparent;
    border: none;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
  }

  .cec-tab-active {
    color: var(--cec-primary);
    border-bottom-color: var(--cec-primary);
  }

  .cec-preview-container {
    background: white;
    border: 1px solid var(--cec-border);
    border-radius: 12px;
    overflow-x: auto;
    max-height: 400px;
    padding: 1rem;
  }

  .theme-dark .cec-preview-container {
    background: rgb(15, 23, 42);
    border-color: rgb(30, 41, 59);
  }

  .cec-code-container {
    position: relative;
  }

  .cec-code-textarea {
    width: 100%;
    height: 300px;
    background: rgb(30, 41, 59);
    color: rgb(226, 232, 240);
    border-radius: 12px;
    padding: 1.5rem;
    font-size: 0.875rem;
    resize: vertical;
    border: none;
  }

  .cec-copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--cec-primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
  }

  .cec-copy-btn:hover {
    background: var(--cec-primary-hover);
  }

  .cec-preview-container table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
  }

  .cec-preview-container th {
    background: var(--cec-bg-light);
    border-bottom: 2px solid var(--cec-border);
    padding: 0.75rem;
    text-align: left;
    font-weight: 700;
    color: var(--cec-text-primary);
  }

  .theme-dark .cec-preview-container th {
    background: rgb(30, 41, 59);
    border-bottom-color: var(--cec-border-dark);
    color: var(--cec-text-light);
  }

  .cec-preview-container td {
    padding: 0.75rem;
    border-bottom: 1px solid rgb(241, 245, 249);
    color: var(--cec-text-secondary);
  }

  .theme-dark .cec-preview-container td {
    border-bottom-color: rgb(30, 41, 59);
    color: rgb(148, 163, 184);
  }

  .cec-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: rgb(148, 163, 184);
    text-align: center;
    gap: 1rem;
  }

  .cec-preview-container table.bordered {
    border: 1px solid var(--cec-border);
  }

  .cec-preview-container table.bordered th,
  .cec-preview-container table.bordered td {
    border: 1px solid var(--cec-border);
  }

  .theme-dark .cec-preview-container table.bordered,
  .theme-dark .cec-preview-container table.bordered th,
  .theme-dark .cec-preview-container table.bordered td {
    border-color: var(--cec-border-dark);
  }

  .cec-preview-container table.zebra tbody tr:nth-child(even) {
    background: var(--cec-bg-light);
  }

  .theme-dark .cec-preview-container table.zebra tbody tr:nth-child(even) {
    background: rgba(30, 41, 59, 0.5);
  }