/* --- FORM --- */

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.form-section {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-normal) ease;
}

.form-section:focus-within {
  box-shadow: var(--shadow-md);
}

.form-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.form-section-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
}

.form-section-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--teal);
  background: var(--teal-soft);
  padding: 0.15em 0.6em;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
}

/* --- Field groups --- */

.field-group {
  margin-bottom: var(--space-md);
}

.field-group:last-child {
  margin-bottom: 0;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.field-row-3 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-md);
}

/* --- Labels --- */

.field-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.field-label-required::after {
  content: ' *';
  color: var(--red);
}

/* --- Inputs --- */

.field-input,
.field-select {
  display: block;
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) ease,
              box-shadow var(--duration-fast) ease;
  -webkit-appearance: none;
  appearance: none;
}

.field-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.field-input:hover,
.field-select:hover {
  border-color: var(--border-strong);
}

.field-input:focus,
.field-select:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px var(--teal-glow);
  outline: none;
}

/* --- Select arrow --- */

.field-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234a6670' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
  cursor: pointer;
}

/* --- Validation states --- */

.field-input[aria-invalid="true"],
.field-select[aria-invalid="true"] {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.field-error {
  font-size: 0.78rem;
  color: var(--red);
  margin-top: var(--space-xs);
  min-height: 1.2em;
}

.field-input-valid {
  border-color: var(--green-light);
}

/* --- Checkbox --- */

.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--teal-soft);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast) ease;
}

.checkbox-group:hover {
  background: var(--green-soft);
}

.checkbox-input {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

/* --- Tax summary --- */

.tax-summary {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.tax-summary-title {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  letter-spacing: 0.04em;
}

.tax-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xs) 0;
  font-size: 0.92rem;
}

.tax-row-label {
  color: var(--text-secondary);
}

.tax-row-value {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--text);
}

.tax-row-total {
  border-top: 1px solid var(--border);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  font-weight: 600;
}

.tax-row-total .tax-row-value {
  color: var(--teal);
  font-size: 1.05rem;
}

/* --- Demo indicator badges --- */

.demo-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--blue-soft);
  padding: 0.15em 0.55em;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
  vertical-align: middle;
  margin-left: var(--space-sm);
}

/* --- Responsive --- */

@media (max-width: 768px) {
  .form-grid {
    grid-template-columns: 1fr;
  }

  .field-row,
  .field-row-3 {
    grid-template-columns: 1fr;
  }

  .form-section {
    padding: var(--space-lg);
  }
}

/* --- Drag handle --- */

.form-section-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.drag-handle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  cursor: grab;
  opacity: 0.5;
  transition: opacity var(--duration-fast) ease,
              color var(--duration-fast) ease;
  padding: 0.15rem;
  line-height: 1;
}

.drag-handle:hover {
  opacity: 1;
  color: var(--teal);
}

.form-section[draggable="true"]:active .drag-handle {
  cursor: grabbing;
}

.form-section.drag-over {
  outline: 2px dashed var(--teal);
  outline-offset: -2px;
  background: var(--teal-soft);
}

.form-section.dragging {
  opacity: 0.5;
}

/* --- Swap button --- */

.swap-row {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-xl);
}

.swap-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--teal);
  background: var(--teal-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.5rem 1.25rem;
  cursor: pointer;
  transition: background var(--duration-fast) ease,
              color var(--duration-fast) ease,
              box-shadow var(--duration-fast) ease;
}

.swap-button:hover {
  background: var(--green-soft);
  color: var(--green-light);
  box-shadow: var(--shadow-sm);
}

/* --- Conditional field (Demo 4) --- */

.conditional-field {
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-out),
              opacity var(--duration-normal) ease,
              margin var(--duration-normal) ease;
}

.conditional-field[aria-hidden="true"] {
  max-height: 0;
  opacity: 0;
  margin-bottom: 0;
}

.conditional-field[aria-hidden="false"] {
  max-height: 120px;
  opacity: 1;
  margin-bottom: var(--space-md);
}

@media (prefers-reduced-motion: reduce) {
  .conditional-field {
    transition: none;
  }
}