.calc-form {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .input-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .input-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .input-group label {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .input-group .input-hint {
      font-size: 0.75rem;
      color: var(--color-text-muted);
      font-weight: 400;
    }

    .calc-input {
      padding: 14px 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--color-text);
      background: var(--color-surface);
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
      outline: none;
      width: 100%;
      -moz-appearance: textfield;
    }

    .calc-input::-webkit-inner-spin-button,
    .calc-input::-webkit-outer-spin-button {
      -webkit-appearance: none;
      margin: 0;
    }

    .calc-input:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px var(--color-primary-light);
    }

    .calc-input::placeholder {
      color: var(--color-text-muted);
      font-weight: 400;
    }

    .results-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 12px;
      margin-top: 28px;
      padding-top: 28px;
      border-top: 1px solid var(--color-border-light);
    }

    .result-card {
      padding: 20px;
      background: var(--color-bg);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-md);
      text-align: center;
    }

    .result-card.highlight {
      background: linear-gradient(135deg, #ecfdf5, #d1fae5);
      border-color: #a7f3d0;
    }

    .result-card .result-card-label {
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--color-text-muted);
      margin-bottom: 8px;
    }

    .result-card .result-card-value {
      font-size: 2rem;
      font-weight: 700;
      color: var(--color-text);
      font-family: var(--font-mono);
      letter-spacing: -0.02em;
    }

    .result-card.highlight .result-card-value { color: #047857; }

    .result-card .result-card-note {
      font-size: 0.78rem;
      color: var(--color-text-muted);
      margin-top: 4px;
    }

    .formula-display {
      margin-top: 16px;
      padding: 16px;
      background: var(--color-bg);
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-mono);
      font-size: 0.85rem;
      color: var(--color-text-secondary);
      text-align: center;
      line-height: 1.6;
    }

    @media (max-width: 600px) {
      .input-row { grid-template-columns: 1fr; }
      .results-grid { grid-template-columns: 1fr; }
      .result-card .result-card-value { font-size: 1.6rem; }
    }