/**
 * CBTAPPS Design System - Form Components
 * Version: 1.0.0
 *
 * Comprehensive form component system with inputs,
 * selects, textareas, checkboxes, radios, and more.
 */

/* ============================================
 * FORM GROUP
 * ============================================ */

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

.cbt-form-group--inline {
  flex-direction: row;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);

  .cbt-form-label {
    margin-bottom: 0;
    flex-shrink: 0;
  }
}

.cbt-form-group--horizontal {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--spacing-4);

  .cbt-form-label {
    min-width: 120px;
    padding-top: var(--spacing-3);
  }
}

/* ============================================
 * FORM LABEL
 * ============================================ */

.cbt-form-label {
  display: inline-block;
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-1);
}

.cbt-form-label--required {
  &::after {
    content: ' *';
    color: var(--color-error-500);
  }
}

.cbt-form-label--optional {
  font-weight: var(--font-weight-normal);
  color: var(--color-text-tertiary);

  &::before {
    content: '(Optional) ';
  }
}

/* ============================================
 * FORM HELP TEXT
 * ============================================ */

.cbt-form-help {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-1);
}

.cbt-form-error {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-error-500);
  margin-top: var(--spacing-1);
}

/* ============================================
 * TEXT INPUT BASE
 * ============================================ */

.cbt-input {
  display: block;
  width: 100%;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  padding: var(--spacing-3) var(--spacing-4);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);

  &::placeholder {
    color: var(--color-text-tertiary);
  }

  &:hover:not(:disabled) {
    border-color: var(--color-border-strong);
  }

  &:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(0, 115, 230, 0.1);
  }

  &:disabled {
    background-color: var(--color-background-secondary);
    cursor: not-allowed;
    opacity: 0.6;
  }

  /* Readonly state */
  &[readonly] {
    background-color: var(--color-background-secondary);
    cursor: default;
  }
}

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

.cbt-input--sm {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
}

.cbt-input--lg {
  padding: var(--spacing-4) var(--spacing-5);
  font-size: var(--font-size-lg);
}

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

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

  &:focus {
    border-color: var(--color-border-error);
    box-shadow: 0 0 0 3px rgba(230, 0, 0, 0.1);
  }
}

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

  &:focus {
    border-color: var(--color-border-success);
    box-shadow: 0 0 0 3px rgba(0, 159, 71, 0.1);
  }
}

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

  &:focus {
    border-color: var(--color-border-warning);
    box-shadow: 0 0 0 3px rgba(255, 170, 0, 0.1);
  }
}

/* ============================================
 * SELECT INPUT
 * ============================================ */

.cbt-select {
  .cbt-input();
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23737373' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-3) center;
  padding-right: var(--spacing-10);
  cursor: pointer;
}

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

.cbt-textarea {
  .cbt-input();
  min-height: 100px;
  resize: vertical;

  &--sm {
    min-height: 60px;
  }

  &--lg {
    min-height: 200px;
  }
}

/* ============================================
 * CHECKBOX & RADIO
 * ============================================ */

.cbt-checkbox,
.cbt-radio {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  cursor: pointer;
  user-select: none;

  & input[type="checkbox"],
  & input[type="radio"] {
    appearance: none;
    width: 1.125em;
    height: 1.125em;
    border: 2px solid var(--color-border-default);
    background-color: var(--color-background-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
  }
}

.cbt-checkbox input[type="checkbox"] {
  border-radius: var(--radius-sm);

  &:checked {
    background-color: var(--color-primary-500);
    border-color: var(--color-primary-500);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='white' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M4 8l3 3 5-5'/%3E%3C/svg%3E");
    background-size: 75%;
    background-position: center;
    background-repeat: no-repeat;
  }

  &:indeterminate {
    background-color: var(--color-primary-500);
    border-color: var(--color-primary-500);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='white' stroke-linecap='round' stroke-width='2' d='M4 8h8'/%3E%3C/svg%3E");
    background-size: 75%;
    background-position: center;
    background-repeat: no-repeat;
  }
}

.cbt-radio input[type="radio"] {
  border-radius: var(--radius-full);

  &:checked {
    border-color: var(--color-primary-500);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='3' fill='%230073e6'/%3E%3C/svg%3E");
    background-size: 50%;
    background-position: center;
    background-repeat: no-repeat;
  }
}

.cbt-checkbox--error input[type="checkbox"],
.cbt-radio--error input[type="radio"] {
  border-color: var(--color-error-500);

  &:checked {
    border-color: var(--color-error-500);
    background-color: var(--color-error-500);
  }
}

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

.cbt-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;

  & input {
    opacity: 0;
    width: 0;
    height: 0;
  }

  &__slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: var(--color-neutral-300);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-base);

    &::before {
      content: '';
      position: absolute;
      height: 18px;
      width: 18px;
      left: 3px;
      bottom: 3px;
      background-color: white;
      border-radius: var(--radius-full);
      transition: transform var(--transition-base);
      box-shadow: var(--shadow-sm);
    }
  }

  input:checked + &__slider {
    background-color: var(--color-primary-500);

    &::before {
      transform: translateX(20px);
    }
  }

  input:disabled + &__slider {
    opacity: 0.5;
    cursor: not-allowed;
  }

  input:focus-visible + &__slider {
    box-shadow: 0 0 0 3px rgba(0, 115, 230, 0.1);
  }
}

/* ============================================
 * INPUT GROUP
 * ============================================ */

.cbt-input-group {
  display: flex;
  align-items: stretch;
  width: 100%;

  .cbt-input {
    border-radius: 0;

    &:not(:first-child):not(:last-child) {
      border-left: none;
      border-right: none;
    }

    &:first-child {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
    }

    &:last-child {
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
    }
  }

  .cbt-btn {
    border-radius: 0;

    &:first-child {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
    }

    &:last-child {
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
    }
  }
}

.cbt-input-group__text,
.cbt-input-group__prepend,
.cbt-input-group__append {
  display: flex;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  background-color: var(--color-background-secondary);
  border: 1px solid var(--color-border-default);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  white-space: nowrap;
}

.cbt-input-group__prepend {
  border-right: none;
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
}

.cbt-input-group__append {
  border-left: none;
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

/* ============================================
 * RANGE SLIDER
 * ============================================ */

.cbt-range {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-neutral-200);
  outline: none;
  appearance: none;

  &::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--color-primary-500);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base);
  }

  &::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--color-primary-500);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base);
  }

  &:hover::-webkit-slider-thumb,
  &:hover::-moz-range-thumb {
    background: var(--color-primary-600);
  }

  &:focus-visible {
    box-shadow: 0 0 0 3px rgba(0, 115, 230, 0.1);
  }
}

/* ============================================
 * FILE INPUT
 * ============================================ */

.cbt-file-input {
  .cbt-input();
  padding: var(--spacing-3);
  cursor: pointer;

  &::file-selector-button {
    margin-right: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    background-color: var(--color-background-secondary);
    border: 1px solid var(--color-border-default);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);

    &:hover {
      background-color: var(--color-background-tertiary);
    }
  }
}

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

@media (prefers-contrast: high) {
  .cbt-input,
  .cbt-select,
  .cbt-textarea {
    border-width: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cbt-input,
  .cbt-select,
  .cbt-textarea,
  .cbt-checkbox input[type="checkbox"],
  .cbt-radio input[type="radio"],
  .cbt-switch__slider::before {
    transition: none;
  }
}