/**
 * Universal Form System
 * Comprehensive form components with consistent styling and accessibility
 * Consolidates all form patterns from across the application
 */

/* ===========================================
   FORM CONTAINER
   =========================================== */

.form {
  width: 100%;
}

.form-group {
  margin-bottom: var(--space-lg);
  width: 100%;
}

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

.form-col {
  flex: 1;
  min-width: 0;
}

.form-col-auto {
  flex: 0 0 auto;
}

/* ===========================================
   FORM LABELS
   =========================================== */

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: var(--leading-normal);
}

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

.form-label-inline {
  display: inline-block;
  margin-bottom: 0;
  margin-right: var(--space-sm);
}

/* ===========================================
   BASE INPUT STYLES
   =========================================== */

.form-input {
  display: block;
  width: 100%;
  padding: var(--padding-input);
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-clip: padding-box;
  border: var(--component-border);
  border-radius: var(--component-radius);
  transition: var(--transition-colors), 
              box-shadow var(--transition-base);
  appearance: none;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--state-focus-ring);
}

.form-input:disabled,
.form-input[readonly] {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: var(--state-disabled-opacity);
}

.form-input::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

/* ===========================================
   INPUT VARIANTS
   =========================================== */

/* Small input */
.form-input-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-xs);
  border-radius: var(--component-radius-sm);
}

/* Large input */
.form-input-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--text-base);
  border-radius: var(--component-radius-lg);
}

/* Textarea */
.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: var(--leading-relaxed);
}

.form-textarea.auto-resize {
  resize: none;
  overflow: hidden;
}

/* ===========================================
   INPUT STATES
   =========================================== */

/* Success state */
.form-input.success {
  border-color: var(--color-success);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2328a745'%3e%3cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  background-size: 1rem 1rem;
  padding-right: var(--space-3xl);
}

.form-input.success:focus {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

/* Warning state */
.form-input.warning {
  border-color: var(--color-warning);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23ffc107'%3e%3cpath fill-rule='evenodd' d='M8.257 3.099c.765-1.36 2.722-1.36 3.486 0l5.58 9.92c.75 1.334-.213 2.98-1.742 2.98H4.42c-1.53 0-2.493-1.646-1.743-2.98l5.58-9.92zM11 13a1 1 0 11-2 0 1 1 0 012 0zm-1-8a1 1 0 00-1 1v3a1 1 0 002 0V6a1 1 0 00-1-1z' clip-rule='evenodd'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  background-size: 1rem 1rem;
  padding-right: var(--space-3xl);
}

.form-input.warning:focus {
  border-color: var(--color-warning);
  box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
}

/* Error state */
.form-input.error {
  border-color: var(--color-danger);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23dc2626'%3e%3cpath fill-rule='evenodd' d='M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7 4a1 1 0 11-2 0 1 1 0 012 0zm-1-9a1 1 0 00-1 1v4a1 1 0 102 0V6a1 1 0 00-1-1z' clip-rule='evenodd'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  background-size: 1rem 1rem;
  padding-right: var(--space-3xl);
}

.form-input.error:focus {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

/* ===========================================
   SELECT ELEMENTS
   =========================================== */

.form-select {
  display: block;
  width: 100%;
  padding: var(--padding-input);
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236b7280'%3e%3cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z' clip-rule='evenodd'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  background-size: 1rem 1rem;
  border: var(--component-border);
  border-radius: var(--component-radius);
  transition: var(--transition-colors), 
              box-shadow var(--transition-base);
  appearance: none;
  padding-right: var(--space-3xl);
}

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

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

.form-select-sm {
  padding: var(--space-sm) var(--space-2xl) var(--space-sm) var(--space-md);
  font-size: var(--text-xs);
  border-radius: var(--component-radius-sm);
}

.form-select-lg {
  padding: var(--space-lg) var(--space-3xl) var(--space-lg) var(--space-xl);
  font-size: var(--text-base);
  border-radius: var(--component-radius-lg);
}

/* Multiple select */
.form-select[multiple] {
  height: auto;
  background-image: none;
  padding-right: var(--padding-input);
}

/* ===========================================
   CHECKBOX AND RADIO INPUTS
   =========================================== */

.form-check {
  display: block;
  margin-bottom: var(--space-md);
  position: relative;
}

.form-check-inline {
  display: inline-flex;
  align-items: center;
  margin-right: var(--space-lg);
  margin-bottom: 0;
}

.form-check-input {
  width: 1rem;
  height: 1rem;
  margin-top: 0;
  margin-right: var(--space-sm);
  vertical-align: top;
  background-color: var(--bg-primary);
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  border: var(--component-border);
  transition: var(--transition-colors), 
              box-shadow var(--transition-base);
  cursor: pointer;
  flex-shrink: 0;
}

.form-check-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--state-focus-ring);
}

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

.form-check-input:disabled {
  opacity: var(--state-disabled-opacity);
  cursor: not-allowed;
}

/* Checkbox styles */
.form-check-input[type="checkbox"] {
  border-radius: var(--component-radius-sm);
}

.form-check-input[type="checkbox"]:checked {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3e%3cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3e%3c/svg%3e");
}

.form-check-input[type="checkbox"]:indeterminate {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3e%3cpath fill-rule='evenodd' d='M5 10a1 1 0 011-1h8a1 1 0 110 2H6a1 1 0 01-1-1z' clip-rule='evenodd'/%3e%3c/svg%3e");
}

/* Radio styles */
.form-check-input[type="radio"] {
  border-radius: 50%;
}

.form-check-input[type="radio"]:checked {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='2' fill='white'/%3e%3c/svg%3e");
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  line-height: var(--leading-normal);
}

.form-check-input:disabled + .form-check-label {
  opacity: var(--state-disabled-opacity);
  cursor: not-allowed;
}

/* ===========================================
   SWITCH/TOGGLE
   =========================================== */

.form-switch {
  padding-left: 0;
}

.form-switch .form-check-input {
  width: 2rem;
  height: 1rem;
  margin-left: 0;
  background-image: none;
  background-color: var(--color-gray-300);
  border: none;
  border-radius: 1rem;
  transition: var(--transition-colors);
  cursor: pointer;
  position: relative;
}

.form-switch .form-check-input:focus {
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

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

.form-switch .form-check-input::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 1rem;
  height: 1rem;
  background-color: white;
  border-radius: 50%;
  transition: var(--transition-transform);
  box-shadow: var(--component-shadow);
}

.form-switch .form-check-input:checked::before {
  transform: translateX(1rem);
}

.form-switch .form-check-label {
  margin-left: var(--space-sm);
}

/* ===========================================
   INPUT GROUPS
   =========================================== */

.input-group {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  width: 100%;
}

.input-group > .form-input,
.input-group > .form-select {
  position: relative;
  flex: 1 1 auto;
  width: 1%;
  min-width: 0;
}

.input-group > .form-input:not(:first-child),
.input-group > .form-select:not(:first-child) {
  margin-left: -1px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.input-group > .form-input:not(:last-child),
.input-group > .form-select:not(:last-child) {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.input-group-text {
  display: flex;
  align-items: center;
  padding: var(--padding-input);
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-secondary);
  text-align: center;
  white-space: nowrap;
  background-color: var(--bg-tertiary);
  border: var(--component-border);
  border-radius: var(--component-radius);
}

.input-group-text:not(:first-child) {
  margin-left: -1px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.input-group-text:not(:last-child) {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

/* ===========================================
   FORM FEEDBACK
   =========================================== */

.form-help {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  line-height: var(--leading-normal);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  margin-top: var(--space-xs);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  line-height: var(--leading-normal);
}

.form-success {
  font-size: var(--text-xs);
  color: var(--color-success);
  margin-top: var(--space-xs);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  line-height: var(--leading-normal);
}

.form-warning {
  font-size: var(--text-xs);
  color: var(--color-warning-dark);
  margin-top: var(--space-xs);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  line-height: var(--leading-normal);
}

/* ===========================================
   FILE INPUTS
   =========================================== */

.form-file {
  position: relative;
  display: inline-block;
  width: 100%;
}

.form-file-input {
  position: relative;
  z-index: 2;
  width: 100%;
  height: auto;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.form-file-label {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1;
  height: auto;
  padding: var(--padding-input);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-muted);
  background-color: var(--bg-primary);
  border: var(--component-border);
  border-radius: var(--component-radius);
  cursor: pointer;
}

.form-file-input:focus + .form-file-label {
  border-color: var(--color-primary);
  box-shadow: var(--state-focus-ring);
}

.form-file-input:disabled + .form-file-label {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: var(--state-disabled-opacity);
}

/* ===========================================
   RANGE INPUTS
   =========================================== */

.form-range {
  width: 100%;
  height: 1.5rem;
  padding: 0;
  background-color: transparent;
  appearance: none;
  cursor: pointer;
}

.form-range:focus {
  outline: none;
}

.form-range::-webkit-slider-track {
  width: 100%;
  height: 0.5rem;
  color: transparent;
  cursor: pointer;
  background-color: var(--color-gray-200);
  border-color: transparent;
  border-radius: 1rem;
}

.form-range::-webkit-slider-thumb {
  width: 1rem;
  height: 1rem;
  margin-top: -0.25rem;
  background-color: var(--color-primary);
  border: 0;
  border-radius: 1rem;
  box-shadow: var(--component-shadow);
  transition: var(--transition-colors);
  appearance: none;
  cursor: pointer;
}

.form-range::-webkit-slider-thumb:hover {
  background-color: var(--color-primary-hover);
}

.form-range:focus::-webkit-slider-thumb {
  box-shadow: var(--state-focus-ring);
}

.form-range::-moz-range-track {
  width: 100%;
  height: 0.5rem;
  color: transparent;
  cursor: pointer;
  background-color: var(--color-gray-200);
  border-color: transparent;
  border-radius: 1rem;
}

.form-range::-moz-range-thumb {
  width: 1rem;
  height: 1rem;
  background-color: var(--color-primary);
  border: 0;
  border-radius: 1rem;
  box-shadow: var(--component-shadow);
  transition: var(--transition-colors);
  cursor: pointer;
}

/* ===========================================
   FLOATING LABELS
   =========================================== */

.form-floating {
  position: relative;
}

.form-floating > .form-input,
.form-floating > .form-select {
  height: 3.5rem;
  padding: 1rem 0.75rem 0.25rem;
}

.form-floating > label {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  padding: 1rem 0.75rem;
  pointer-events: none;
  border: 1px solid transparent;
  transform-origin: 0 0;
  transition: var(--transition-all);
  color: var(--text-muted);
}

.form-floating > .form-input:focus ~ label,
.form-floating > .form-input:not(:placeholder-shown) ~ label,
.form-floating > .form-select ~ label {
  opacity: 0.65;
  transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
  color: var(--color-primary);
}

/* ===========================================
   RESPONSIVE FORM BEHAVIORS
   =========================================== */

@media (max-width: 768px) {
  .form-row {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .form-col {
    width: 100%;
  }
  
  .form-check-inline {
    display: block;
    margin-right: 0;
    margin-bottom: var(--space-sm);
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .input-group > .form-input,
  .input-group > .form-select,
  .input-group-text {
    border-radius: var(--component-radius);
  }
  
  .input-group > .form-input:not(:last-child),
  .input-group > .form-select:not(:last-child),
  .input-group-text:not(:last-child) {
    margin-bottom: -1px;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .form-input,
  .form-select,
  .form-check-input,
  .form-range::-webkit-slider-thumb,
  .form-range::-moz-range-thumb {
    transition: none;
  }
  
  .form-floating > label {
    transition: none;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .form-input,
  .form-select,
  .form-check-input {
    border-width: 2px;
  }
  
  .form-input:focus,
  .form-select:focus,
  .form-check-input:focus {
    outline: 3px solid;
    outline-offset: 2px;
  }
}