/**
 * Form Components - Mindeck Platform
 * Reusable form input styles with states and accessibility features
 * Requirements: 5.3, 6.1, 6.2, 7.3
 */

/* ============================================
   BASE FORM STYLES
   ============================================ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  line-height: var(--line-height-normal);
}

.form-label-required::after {
  content: "*";
  color: var(--color-error-500);
  margin-left: var(--space-1);
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  line-height: var(--line-height-normal);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error-500);
  line-height: var(--line-height-normal);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ============================================
   TEXT INPUT STYLES
   ============================================ */

.form-input {
  /* Layout */
  width: 100%;
  display: block;
  
  /* Typography */
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  
  /* Spacing */
  padding: var(--space-3) var(--space-4);
  
  /* Borders and background */
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  
  /* Transitions */
  transition: 
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
  
  /* Remove default appearance */
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

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

/* Focus State */
.form-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
  background-color: var(--bg-primary);
}

/* Hover State */
.form-input:hover:not(:disabled):not(:focus) {
  border-color: var(--text-tertiary);
}

/* Error State */
.form-input.error,
.form-input:invalid:not(:placeholder-shown) {
  border-color: var(--color-error-500);
}

.form-input.error:focus {
  border-color: var(--color-error-500);
  box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.2);
}

/* Success State */
.form-input.success {
  border-color: var(--color-success-500);
}

.form-input.success:focus {
  border-color: var(--color-success-500);
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
}

/* Disabled State */
.form-input:disabled {
  background-color: var(--bg-tertiary);
  color: var(--text-disabled);
  cursor: not-allowed;
  opacity: 0.6;
}

/* ============================================
   TEXTAREA STYLES
   ============================================ */

.form-textarea {
  /* Inherit input styles */
  width: 100%;
  display: block;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-4);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: 
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
  appearance: none;
  
  /* Textarea specific */
  min-height: 120px;
  resize: vertical;
}

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

.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
  background-color: var(--bg-primary);
}

.form-textarea:hover:not(:disabled):not(:focus) {
  border-color: var(--text-tertiary);
}

.form-textarea.error {
  border-color: var(--color-error-500);
}

.form-textarea.error:focus {
  border-color: var(--color-error-500);
  box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.2);
}

.form-textarea:disabled {
  background-color: var(--bg-tertiary);
  color: var(--text-disabled);
  cursor: not-allowed;
  opacity: 0.6;
  resize: none;
}

/* ============================================
   SELECT STYLES
   ============================================ */

.form-select {
  /* Inherit input styles */
  width: 100%;
  display: block;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-10) var(--space-3) var(--space-4);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: 
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  
  /* Custom dropdown arrow */
  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='%23616161' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  background-size: 12px;
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
  background-color: var(--bg-primary);
}

.form-select:hover:not(:disabled):not(:focus) {
  border-color: var(--text-tertiary);
}

.form-select.error {
  border-color: var(--color-error-500);
}

.form-select.error:focus {
  border-color: var(--color-error-500);
  box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.2);
}

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

/* Dark mode arrow adjustment */
[data-theme="dark"] .form-select {
  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='%23e0e0e0' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
}

/* ============================================
   CHECKBOX STYLES
   ============================================ */

.form-checkbox-wrapper {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.form-checkbox {
  /* Hide default checkbox */
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.form-checkbox-custom {
  /* Custom checkbox appearance */
  width: 20px;
  height: 20px;
  min-width: 20px;
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 
    background-color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
  position: relative;
  margin-top: 2px;
}

/* Checkmark icon */
.form-checkbox-custom::after {
  content: "";
  width: 10px;
  height: 10px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'%3E%3Cpath fill='white' d='M3.5 7.5L1 5l.7-.7 1.8 1.8 4-4 .7.7z'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0;
  transform: scale(0.5);
  transition: 
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

/* Checked State */
.form-checkbox:checked + .form-checkbox-custom {
  background-color: var(--interactive-primary);
  border-color: var(--interactive-primary);
}

.form-checkbox:checked + .form-checkbox-custom::after {
  opacity: 1;
  transform: scale(1);
}

/* Focus State */
.form-checkbox:focus + .form-checkbox-custom {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
}

/* Hover State */
.form-checkbox-wrapper:hover .form-checkbox:not(:disabled) + .form-checkbox-custom {
  border-color: var(--interactive-primary);
}

/* Disabled State */
.form-checkbox:disabled + .form-checkbox-custom {
  background-color: var(--bg-tertiary);
  border-color: var(--border-secondary);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-checkbox:disabled ~ .form-checkbox-label {
  color: var(--text-disabled);
  cursor: not-allowed;
}

/* Checkbox Label */
.form-checkbox-label {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  line-height: var(--line-height-normal);
  cursor: pointer;
}

/* ============================================
   RADIO BUTTON STYLES
   ============================================ */

.form-radio-wrapper {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.form-radio {
  /* Hide default radio */
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.form-radio-custom {
  /* Custom radio appearance */
  width: 20px;
  height: 20px;
  min-width: 20px;
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-full);
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 
    background-color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
  position: relative;
  margin-top: 2px;
}

/* Radio dot */
.form-radio-custom::after {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background-color: var(--text-inverse);
  opacity: 0;
  transform: scale(0.5);
  transition: 
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

/* Checked State */
.form-radio:checked + .form-radio-custom {
  background-color: var(--interactive-primary);
  border-color: var(--interactive-primary);
}

.form-radio:checked + .form-radio-custom::after {
  opacity: 1;
  transform: scale(1);
}

/* Focus State */
.form-radio:focus + .form-radio-custom {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
}

/* Hover State */
.form-radio-wrapper:hover .form-radio:not(:disabled) + .form-radio-custom {
  border-color: var(--interactive-primary);
}

/* Disabled State */
.form-radio:disabled + .form-radio-custom {
  background-color: var(--bg-tertiary);
  border-color: var(--border-secondary);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-radio:disabled ~ .form-radio-label {
  color: var(--text-disabled);
  cursor: not-allowed;
}

/* Radio Label */
.form-radio-label {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  line-height: var(--line-height-normal);
  cursor: pointer;
}

/* ============================================
   RADIO GROUP STYLES
   ============================================ */

.form-radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.form-radio-group-inline {
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--space-6);
}

/* ============================================
   INPUT SIZES
   ============================================ */

/* Small Input */
.form-input-sm,
.form-select-sm,
.form-textarea-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
}

.form-select-sm {
  padding-right: var(--space-8);
  background-position: right var(--space-3) center;
}

/* Large Input */
.form-input-lg,
.form-select-lg,
.form-textarea-lg {
  padding: var(--space-4) var(--space-5);
  font-size: var(--font-size-md);
}

.form-select-lg {
  padding-right: var(--space-12);
  background-position: right var(--space-5) center;
}

/* ============================================
   INPUT WITH ICONS
   ============================================ */

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

.form-input-icon {
  position: absolute;
  left: var(--space-4);
  color: var(--text-tertiary);
  pointer-events: none;
  display: flex;
  align-items: center;
}

.form-input-group .form-input {
  padding-left: var(--space-10);
}

.form-input-icon-right {
  left: auto;
  right: var(--space-4);
}

.form-input-group .form-input-icon-right ~ .form-input {
  padding-left: var(--space-4);
  padding-right: var(--space-10);
}

/* ============================================
   FORM LAYOUTS
   ============================================ */

.form-row {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.form-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

.form-inline {
  display: flex;
  align-items: flex-end;
  gap: var(--space-4);
}

.form-inline .form-group {
  margin-bottom: 0;
}

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* Focus visible for keyboard navigation */
.form-input:focus-visible,
.form-textarea:focus-visible,
.form-select:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.form-checkbox:focus-visible + .form-checkbox-custom,
.form-radio:focus-visible + .form-radio-custom {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .form-input,
  .form-textarea,
  .form-select {
    border-width: 2px;
  }
  
  .form-checkbox-custom,
  .form-radio-custom {
    border-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .form-input,
  .form-textarea,
  .form-select,
  .form-checkbox-custom,
  .form-radio-custom,
  .form-checkbox-custom::after,
  .form-radio-custom::after {
    transition: none;
  }
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

/* Mobile (320px - 767px) */
@media (max-width: 767px) {
  .form-row {
    flex-direction: column;
    gap: 0;
  }
  
  .form-row .form-group {
    margin-bottom: var(--space-4);
  }
  
  .form-inline {
    flex-direction: column;
    align-items: stretch;
  }
  
  .form-inline .form-group {
    margin-bottom: var(--space-4);
  }
  
  .form-radio-group-inline {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  /* Larger touch targets on mobile */
  .form-input,
  .form-textarea,
  .form-select {
    min-height: 44px;
  }
  
  .form-checkbox-custom,
  .form-radio-custom {
    width: 24px;
    height: 24px;
    min-width: 24px;
  }
}