/* =====================================================
   Income Calculator — shared base styles
   Used by all income calculators (1040, 1065, 1120, etc.)
   ===================================================== */

/* ---- Upload Zone ---- */

.upload-zone {
  border: 2px dashed var(--color-gray-300);
  border-radius: var(--border-radius);
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  text-align: center;
}

.upload-zone:hover {
  border-color: var(--brand-primary);
  background: rgba(var(--brand-primary-rgb, 37, 99, 235), 0.04);
}

.upload-zone.drag-over {
  border-color: var(--brand-primary);
  background: rgba(var(--brand-primary-rgb, 37, 99, 235), 0.08);
  border-style: solid;
}

.upload-zone.processing {
  pointer-events: none;
  opacity: 0.7;
  border-color: var(--color-gray-300);
  background: var(--color-gray-50);
}

.upload-zone.has-data {
  border-color: var(--color-success);
  background: rgba(34, 197, 94, 0.04);
}

.upload-zone.has-error {
  border-color: var(--color-danger);
  background: rgba(239, 68, 68, 0.04);
}

.upload-zone__icon {
  color: var(--color-gray-400);
  transition: color 0.2s;
}

.upload-zone:hover .upload-zone__icon {
  color: var(--brand-primary);
}

.upload-zone.has-data .upload-zone__icon {
  color: var(--color-success);
}

.upload-zone__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.upload-zone__text strong {
  font-size: 0.95rem;
  color: var(--color-gray-700);
}

.upload-zone__text span {
  font-size: 0.8rem;
  color: var(--color-gray-400);
}

.upload-zone__status {
  font-size: 0.85rem;
  min-height: 1.4em;
}

.upload-zone__status.status--loading {
  color: var(--brand-primary);
}

.upload-zone__status.status--success {
  color: var(--color-success);
  font-weight: 600;
}

.upload-zone__status.status--error {
  color: var(--color-danger);
}

/* Spinner */
.upload-zone .spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-gray-300);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---- Document Cards ---- */

#docCards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

#docCards:empty {
  display: none;
}

.doc-card {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: 6px;
  padding: var(--space-sm) var(--space-md);
  transition: border-color 0.2s;
}

.doc-card:hover {
  border-color: var(--color-gray-300);
}

.doc-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: 4px;
}

.doc-card__year {
  font-weight: 700;
  font-size: 1rem;
  color: var(--brand-primary);
  min-width: 3em;
}

.doc-card__name {
  font-size: 0.88rem;
  color: var(--color-gray-600);
}

.doc-card__filing {
  font-size: 0.78rem;
  color: var(--color-gray-400);
}

.doc-card__remove {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--color-gray-400);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.15s;
}

.doc-card__remove:hover {
  color: var(--color-danger);
}

.doc-card__amounts {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--color-gray-600);
}

.doc-card__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--brand-primary);
  background: rgba(37, 99, 235, 0.08);
  padding: 2px 8px;
  border-radius: 4px;
}

.doc-card__badge--secondary {
  color: var(--color-gray-500);
  background: var(--color-gray-100);
}

/* ---- Income Table ---- */

.income-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

.income-table th {
  background: var(--brand-primary);
  color: #fff;
  padding: 0.75rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
}

.income-table th:first-child {
  border-radius: var(--border-radius) 0 0 0;
}

.income-table th:last-child {
  border-radius: 0 var(--border-radius) 0 0;
}

.income-table td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--color-gray-100);
  vertical-align: middle;
}

.income-table tr:last-child td {
  border-bottom: none;
}

.income-table tr:hover td {
  background: var(--color-gray-50);
}

.income-table input[type="number"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--color-gray-200);
  border-radius: 4px;
  font-size: 0.9rem;
  background: var(--color-gray-50);
}

.income-table input[type="number"]:focus {
  outline: none;
  border-color: var(--brand-primary);
  background: #fff;
}

.line-number {
  font-weight: 600;
  color: var(--brand-primary);
  white-space: nowrap;
}

/* ---- Sign Column ---- */

.sign-col {
  text-align: center;
  font-weight: 700;
  width: 50px;
}

.sign-col.add {
  color: var(--color-success);
}

.sign-col.subtract {
  color: var(--color-danger);
}

/* ---- Section Result ---- */

.section-result {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(135deg, #e8f5e8 0%, #d4edda 100%);
  border-radius: var(--border-radius);
  margin-top: var(--space-sm);
}

.section-result .label {
  font-weight: 600;
  color: var(--brand-primary);
}

.section-result .value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand-primary);
}

/* ---- Policy Box ---- */

.policy-box {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--border-radius);
  padding: var(--space-md);
}

.policy-box h5 {
  color: #856404;
  margin: 0 0 var(--space-xs) 0;
  font-size: 0.95rem;
}

.policy-box p {
  color: #856404;
  font-size: 0.88rem;
  margin: 0;
  line-height: 1.5;
}

/* ---- Math Steps (inside calcSteps) ---- */

.math-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.math-step {
  background: var(--color-gray-50);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  border-left: 4px solid var(--brand-primary);
}

.math-step.highlight {
  background: linear-gradient(135deg, #e8f5e8 0%, #f0fff0 100%);
  border-left-color: var(--color-success);
}

.math-step h4 {
  color: var(--brand-primary);
  margin: 0 0 var(--space-sm) 0;
  font-size: 0.95rem;
}

.math-formula {
  font-family: 'Courier New', monospace;
  font-size: 0.88rem;
  color: var(--color-gray-700);
  line-height: 1.8;
}

.math-note {
  color: var(--color-gray-400);
  font-style: italic;
  font-family: inherit;
  font-size: 0.85rem;
}

.math-values {
  display: block;
  margin-top: var(--space-xs);
  padding: var(--space-sm);
  background: #fff;
  border-radius: 4px;
  color: var(--brand-primary);
  font-weight: 600;
}