/**
 * Form Component Styles
 *
 * Comprehensive form system with validation states, helper text, and various input types
 */

/* ============================================
   FORM GROUPS & LAYOUT
   ============================================ */

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

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

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

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

.form-label--required::after {
    content: '*';
    color: var(--color-error);
    margin-left: var(--spacing-xs);
}

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

/* ============================================
   TEXT INPUTS
   ============================================ */

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border-medium);
    border-radius: var(--radius-input);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    transition: var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-text-tertiary);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ============================================
   SELECT DROPDOWNS
   ============================================ */

.form-select {
    cursor: pointer;
    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='%23374151' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    background-size: 12px;
    padding-right: calc(var(--spacing-md) * 3);
}

/* ============================================
   VALIDATION STATES
   ============================================ */

/* Error state */
.form-input--error,
.form-select--error,
.form-textarea--error {
    border-color: var(--color-error);
    background: var(--color-error-bg);
}

.form-input--error:focus,
.form-select--error:focus,
.form-textarea--error:focus {
    border-color: var(--color-error);
    box-shadow: var(--shadow-focus-error);
}

/* Success state */
.form-input--success,
.form-select--success,
.form-textarea--success {
    border-color: var(--color-success);
    background: var(--color-success-bg);
}

.form-input--success:focus,
.form-select--success:focus,
.form-textarea--success:focus {
    border-color: var(--color-success);
    box-shadow: var(--shadow-focus-success);
}

/* Warning state */
.form-input--warning,
.form-select--warning,
.form-textarea--warning {
    border-color: var(--color-warning);
    background: var(--color-warning-bg);
}

/* ============================================
   DISABLED & READONLY STATES
   ============================================ */

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--color-bg-secondary);
}

.form-input:read-only,
.form-textarea:read-only {
    background: var(--color-bg-secondary);
    cursor: default;
}

/* ============================================
   HELPER TEXT
   ============================================ */

.form-helper-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    display: block;
}

.form-helper-text--error {
    color: var(--color-error);
}

.form-helper-text--success {
    color: var(--color-success);
}

.form-helper-text--warning {
    color: var(--color-warning);
}

/* ============================================
   CHECKBOXES & RADIO BUTTONS
   ============================================ */

.form-checkbox,
.form-radio {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border-medium);
    cursor: pointer;
    transition: var(--transition-base);
    margin: 0;
    position: relative;
}

.form-checkbox {
    border-radius: var(--radius-sm);
}

.form-radio {
    border-radius: var(--radius-full);
}

.form-checkbox:checked,
.form-radio:checked {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.form-checkbox:checked::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 6px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.form-radio:checked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: white;
}

.form-checkbox:focus,
.form-radio:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

/* Checkbox/Radio with label */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.form-check input {
    margin: 0;
}

.form-check label {
    cursor: pointer;
    margin: 0;
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
}

/* ============================================
   INPUT GROUPS (Icon/Button combinations)
   ============================================ */

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

.form-input-group__icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
    pointer-events: none;
}

.form-input-group .form-input {
    padding-left: calc(var(--spacing-md) * 3);
}

.form-input-group__addon {
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border-medium);
    border-radius: var(--radius-input);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.form-input-group__addon:first-child {
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.form-input-group__addon:last-child {
    border-left: none;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.form-input-group .form-input:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

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

/* ============================================
   FILE UPLOADS
   ============================================ */

.form-file {
    display: none;
}

.form-file-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border-medium);
    border-radius: var(--radius-input);
    cursor: pointer;
    transition: var(--transition-base);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

.form-file-label:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

.form-file-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

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

.form-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.form-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.form-switch__slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-tertiary);
    border: 2px solid var(--color-border-medium);
    transition: var(--transition-base);
    border-radius: var(--radius-full);
}

.form-switch__slider::before {
    position: absolute;
    content: '';
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background: white;
    transition: var(--transition-base);
    border-radius: var(--radius-full);
}

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

.form-switch input:checked + .form-switch__slider::before {
    transform: translateX(24px);
}

.form-switch input:focus + .form-switch__slider {
    box-shadow: var(--shadow-focus);
}