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

    .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;
    }

    .adorned-input {
      position: relative;
      display: flex;
      align-items: center;
    }

    .adorned-input .input-prefix {
      position: absolute;
      left: 16px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--color-text-muted);
      pointer-events: none;
    }

    .adorned-input .input-suffix {
      position: absolute;
      right: 16px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--color-text-muted);
      pointer-events: none;
    }

    .adorned-input 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;
    }

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

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

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

    .adorned-input.has-prefix input {
      padding-left: 34px;
    }

    .adorned-input.has-suffix input {
      padding-right: 34px;
    }

    /* Mode toggle buttons */
    .mode-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 4px;
    }

    .mode-btn {
      padding: 10px 18px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: var(--color-surface);
      font-family: var(--font-body);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
      white-space: nowrap;
    }

    .mode-btn:hover {
      border-color: var(--color-primary-subtle);
      color: var(--color-primary);
      background: var(--color-primary-light);
    }

    .mode-btn.active {
      background: var(--color-primary);
      color: white;
      border-color: var(--color-primary);
      box-shadow: 0 2px 8px rgba(59,91,219,0.25);
    }

    /* Tiered rows */
    .tier-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tier-row {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .tier-row .tier-label {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      white-space: nowrap;
      min-width: 50px;
    }

    .tier-row input {
      padding: 10px 12px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--color-text);
      background: var(--color-surface);
      outline: none;
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
      -moz-appearance: textfield;
      width: 100%;
    }

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

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

    .tier-row .tier-threshold {
      flex: 2;
      position: relative;
    }

    .tier-row .tier-rate {
      flex: 1;
      position: relative;
    }

    .tier-row .tier-threshold .affix,
    .tier-row .tier-rate .affix {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      color: var(--color-text-muted);
      font-weight: 600;
      pointer-events: none;
    }

    .tier-row .tier-threshold .affix { left: 10px; }
    .tier-row .tier-threshold input { padding-left: 24px; }

    .tier-row .tier-rate .affix { right: 10px; }
    .tier-row .tier-rate input { padding-right: 24px; }

    .tier-remove-btn {
      background: none;
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-sm);
      color: var(--color-text-muted);
      cursor: pointer;
      font-size: 1.1rem;
      line-height: 1;
      padding: 6px 10px;
      transition: all var(--transition-fast);
    }

    .tier-remove-btn:hover {
      border-color: #f87171;
      color: #ef4444;
      background: #fef2f2;
    }

    .add-tier-btn {
      align-self: flex-start;
      padding: 8px 16px;
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-sm);
      background: var(--color-bg);
      font-family: var(--font-body);
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
    }

    .add-tier-btn:hover {
      border-color: var(--color-primary-subtle);
      color: var(--color-primary);
      background: var(--color-primary-light);
    }

    /* Results */
    .results-grid {
      display: grid;
      grid-template-columns: 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;
    }

    .mode-section {
      display: none;
    }

    .mode-section.active {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    @media (max-width: 600px) {
      .results-grid { grid-template-columns: 1fr; }
      .result-card .result-card-value { font-size: 1.6rem; }
      .tier-row { flex-wrap: wrap; }
      .tier-row .tier-label { min-width: 100%; }
    }