@layer base {
  .section {
    padding: var(--spacing-16) 0;
    background-color: var(--surface);
  }

  .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
  }

  .header {
    text-align: center;
    margin-bottom: var(--spacing-12);
  }

  .icon {
    color: var(--primary);
    margin-bottom: var(--spacing-4);
  }

  .title {
    font-family: var(--font-family-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    color: var(--foreground);
  }

  .subtitle {
    font-size: 1.125rem;
    color: var(--muted-foreground);
    max-width: 600px;
    margin: 0 auto;
  }

  .calculator {
    background-color: var(--card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-lg);
  }

  .inputs {
    margin-bottom: var(--spacing-8);
  }

  .inputGroup {
    margin-bottom: var(--spacing-6);
  }

  .label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-3);
    color: var(--foreground);
  }

  .radioGroup {
    display: flex;
    gap: var(--spacing-4);
  }

  .radioLabel {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--animation-duration-fast) ease;
  }

  .radioLabel:hover {
    border-color: var(--primary);
  }

  .radioLabel:has(input:checked) {
    border-color: var(--primary);
    background-color: color-mix(in srgb, var(--primary) 10%, transparent);
  }

  .radioLabel input {
    margin: 0;
  }

  .slider {
    width: 100%;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--muted);
    outline: none;
    appearance: none;
    cursor: pointer;
  }

  .slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow);
  }

  .slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow);
  }

  .results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
  }

  .resultCard {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding: var(--spacing-6);
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    color: white;
  }

  .resultIcon {
    font-size: 1.5rem;
    opacity: 0.9;
  }

  .resultContent {
    flex: 1;
  }

  .resultValue {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
  }

  .resultLabel {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-top: var(--spacing-1);
  }

  .breakdown {
    margin-bottom: var(--spacing-8);
    padding: var(--spacing-6);
    background-color: var(--muted);
    border-radius: var(--radius-lg);
  }

  .breakdownTitle {
    font-family: var(--font-family-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--foreground);
  }

  .breakdownItems {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
  }

  .breakdownItem {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--border);
  }

  .breakdownItem:last-child {
    border-bottom: none;
    font-weight: 600;
  }

  .savings {
    color: var(--success);
    font-weight: 700;
  }

  .cta {
    text-align: center;
  }

  .ctaButton {
    min-width: 250px;
  }

  /* Responsive design */
  @media (max-width: 768px) {
    .title {
      font-size: 2rem;
    }

    .calculator {
      padding: var(--spacing-6);
    }

    .radioGroup {
      flex-direction: column;
    }

    .results {
      grid-template-columns: 1fr;
    }

    .resultCard {
      flex-direction: column;
      text-align: center;
    }

    .breakdownItem {
      flex-direction: column;
      align-items: flex-start;
      gap: var(--spacing-1);
    }
  }
}