.dd-root {
    --dd-indigo: #6366f1;
    --dd-indigo-dark: #4f46e5;
    --dd-rose: #f43f5e;
    --dd-card-bg: #fff;
    --dd-card-border: rgba(0, 0, 0, 0.05);
    --dd-field-bg: #f8fafc;
    --dd-field-border: #e2e8f0;
    --dd-text-main: #1e293b;
    --dd-text-label: #64748b;
    --dd-result-bg: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --dd-result-text: #fff;
    --dd-quick-bg: #f1f5f9;
    --dd-quick-color: #475569;

    width: 100%;
    max-width: 860px;
    margin: 0 auto;
  }

  .theme-dark .dd-root {
    --dd-card-bg: #1e293b;
    --dd-card-border: rgba(255, 255, 255, 0.05);
    --dd-field-bg: #0f172a;
    --dd-field-border: #334155;
    --dd-text-main: #f1f5f9;
    --dd-text-label: #94a3b8;
    --dd-quick-bg: #334155;
    --dd-quick-color: #e2e8f0;
  }

  .dd-card {
    background: var(--dd-card-bg);
    border: 1px solid var(--dd-card-border);
    border-radius: 2rem;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

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

  .dd-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .dd-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--dd-text-label);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .dd-input {
    background: var(--dd-field-bg);
    border: 1px solid var(--dd-field-border);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--dd-text-main);
    font-size: 0.9375rem;
    outline: none;
    transition: border-color 0.2s;
    width: 100%;
    box-sizing: border-box;
  }

  .dd-input:focus {
    border-color: var(--dd-indigo);
  }

  .dd-quick {
    display: flex;
    gap: 0.5rem;
  }

  .dd-quick-btn {
    background: var(--dd-quick-bg);
    color: var(--dd-quick-color);
    border: none;
    border-radius: 0.5rem;
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
  }

  .dd-quick-btn:hover {
    background: var(--dd-indigo);
    color: #fff;
  }

  .dd-result {
    background: var(--dd-result-bg);
    border-radius: 1.5rem;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .dd-result-header {
    text-align: center;
  }

  .dd-result-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }

  .dd-diff-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }

  .dd-diff-item {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 1rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
  }

  .dd-diff-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--dd-result-text);
    line-height: 1;
  }

  .dd-diff-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .dd-totals {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .dd-total-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
  }

  .dd-total-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--dd-result-text);
  }

  .dd-total-label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.65);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    text-align: center;
  }

  @media (max-width: 640px) {
    .dd-card {
      padding: 1.5rem;
    }

    .dd-inputs {
      grid-template-columns: 1fr;
    }

    .dd-diff-grid {
      grid-template-columns: repeat(2, 1fr);
    }

    .dd-diff-value {
      font-size: 1.5rem;
    }
  }