.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

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

.form-row-3 {
  grid-template-columns: repeat(3, 1fr);
}

.form-row-4 {
  grid-template-columns: repeat(4, 1fr);
}

.form-item {
  display: flex;
  flex-direction: column;
}

.form-item-inline {
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-md);
}

.form-item-inline .form-label {
  margin-bottom: 0;
  flex-shrink: 0;
  width: 100px;
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-label.required::before {
  content: '*';
  color: var(--error-color);
  font-weight: var(--font-weight-bold);
}

.form-label.optional::after {
  content: '(可选)';
  color: var(--text-disabled);
  font-weight: var(--font-weight-normal);
  font-size: var(--font-size-xs);
  margin-left: var(--spacing-xs);
}

.form-input {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  background: var(--background-color-white);
  transition: all var(--transition-fast);
  width: 100%;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

.form-input::placeholder {
  color: var(--text-disabled);
}

.form-input:disabled {
  background: var(--background-color);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-input.error {
  border-color: var(--error-color);
}

.form-input.error:focus {
  box-shadow: 0 0 0 2px rgba(245, 34, 45, 0.1);
}

.form-input.success {
  border-color: var(--success-color);
}

.form-input.success:focus {
  box-shadow: 0 0 0 2px rgba(82, 196, 26, 0.1);
}

.form-input.warning {
  border-color: var(--warning-color);
}

.form-input.warning:focus {
  box-shadow: 0 0 0 2px rgba(250, 173, 20, 0.1);
}

.form-input-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-md);
}

.form-input-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

.form-textarea {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  background: var(--background-color-white);
  resize: vertical;
  min-height: 100px;
  font-family: inherit;
  line-height: 1.6;
  transition: all var(--transition-fast);
  width: 100%;
}

.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

.form-textarea:disabled {
  background: var(--background-color);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  background: var(--background-color-white);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23595959' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  background-size: 12px;
  transition: all var(--transition-fast);
  width: 100%;
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

.form-select:disabled {
  background: var(--background-color);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
}

.form-checkbox input {
  display: none;
}

.form-checkbox-box {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.form-checkbox input:checked + .form-checkbox-box {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.form-checkbox input:checked + .form-checkbox-box::after {
  content: '✓';
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.form-checkbox input:disabled + .form-checkbox-box {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-radio {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
}

.form-radio input {
  display: none;
}

.form-radio-box {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.form-radio input:checked + .form-radio-box {
  border-color: var(--primary-color);
}

.form-radio input:checked + .form-radio-box::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--primary-color);
  border-radius: 50%;
}

.form-radio input:disabled + .form-radio-box {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-switch {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
}

.form-switch input {
  display: none;
}

.form-switch-track {
  width: 44px;
  height: 22px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  position: relative;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.form-switch-thumb {
  width: 18px;
  height: 18px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: transform var(--transition-fast);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.form-switch input:checked + .form-switch-track {
  background: var(--primary-color);
}

.form-switch input:checked + .form-switch-track .form-switch-thumb {
  transform: translateX(22px);
}

.form-switch input:disabled + .form-switch-track {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-error {
  color: var(--error-color);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: 4px;
}

.form-success {
  color: var(--success-color);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: 4px;
}

.form-hint {
  color: var(--text-tertiary);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-xs);
  line-height: 1.5;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group-inline {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.form-group-inline .form-label {
  margin-bottom: 0;
  flex-shrink: 0;
  width: 100px;
}

.form-group-inline .form-item {
  flex: 1;
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color-light);
}

.form-actions-right {
  justify-content: flex-end;
}

.form-actions-center {
  justify-content: center;
}

.form-actions-left {
  justify-content: flex-start;
}

.form-prefix,
.form-suffix {
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-sm);
  background: var(--background-color-light);
  border: 1px solid var(--border-color);
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.form-prefix {
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.form-suffix {
  border-left: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.form-group-prefix .form-input {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-left: none;
}

.form-group-suffix .form-input {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-right: none;
}

.form-search {
  position: relative;
}

.form-search-input {
  padding-right: 40px;
}

.form-search-icon {
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 16px;
  pointer-events: none;
}