/**
 * Form Components
 * Complete form element system with all input types and states
 * Implements specifications from TECHTRONIC_DESIGN_SYSTEM.md Section 7.5
 *
 * @package Techtronic_Learning
 * @since 1.0.0
 */

/* ==========================================================================
   Form Field Container
   ========================================================================== */

.form-field {
	margin-bottom: var(--form-field-gap);
}

.form-field:last-child {
	margin-bottom: 0;
}

/* ==========================================================================
   Form Labels
   ========================================================================== */

.form-label {
	display: block;
	font-family: var(--font-display);
	font-size: 14px;
	font-weight: 600;
	color: var(--text-heading-dark); /* On dark bg */
	margin-bottom: var(--form-label-gap);
	line-height: 1.4;
}

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

/* Labels on light surfaces */
.light-surface .form-label {
	color: var(--text-heading-light);
}

/* ==========================================================================
   Text Input
   ========================================================================== */

.form-input {
	/* Size */
	width: 100%;
	height: 48px;
	padding: var(--form-field-padding);

	/* Typography */
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.5;
	color: var(--gray-900);

	/* Appearance */
	background: var(--surface-light-0);
	border: 1px solid var(--gray-200);
	border-radius: var(--radius-base);

	/* Transition */
	transition: all 0.2s ease;

	/* Remove default appearance */
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}

.form-input::placeholder {
	color: var(--gray-400);
}

.form-input:focus {
	outline: none;
	border-color: var(--primary-600);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(77, 208, 225, 0.15);
}

.form-input:hover:not(:disabled):not(:focus) {
	border-color: var(--gray-300);
}

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

.form-input--error:focus {
	border-color: var(--error-500);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(239, 83, 80, 0.15);
}

.form-input--success {
	border-color: var(--success-500);
}

.form-input--success:focus {
	border-color: var(--success-500);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(102, 187, 106, 0.15);
}

.form-input:disabled {
	background: var(--gray-100);
	border-color: var(--gray-200);
	color: var(--gray-400);
	cursor: not-allowed;
	opacity: 0.7;
}

/* ==========================================================================
   Textarea
   ========================================================================== */

.form-textarea {
	/* Inherit from input */
	width: 100%;
	min-height: 120px;
	padding: 12px 16px;

	/* Typography */
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.7;
	color: var(--gray-900);

	/* Appearance */
	background: var(--surface-light-0);
	border: 1px solid var(--gray-200);
	border-radius: 6px;

	/* Resize */
	resize: vertical;

	/* Transition */
	transition: all 0.2s ease;

	/* Remove default appearance */
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}

.form-textarea::placeholder {
	color: var(--gray-400);
}

.form-textarea:focus {
	outline: none;
	border-color: var(--primary-600);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(77, 208, 225, 0.15);
}

.form-textarea:hover:not(:disabled):not(:focus) {
	border-color: var(--gray-300);
}

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

.form-textarea--error:focus {
	border-color: var(--error-500);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(239, 83, 80, 0.15);
}

.form-textarea:disabled {
	background: var(--gray-100);
	border-color: var(--gray-200);
	color: var(--gray-400);
	cursor: not-allowed;
	opacity: 0.7;
	resize: none;
}

/* ==========================================================================
   Select Dropdown
   ========================================================================== */

.form-select {
	/* Size */
	width: 100%;
	height: 48px;
	padding: 12px 40px 12px 16px;

	/* Typography */
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.5;
	color: var(--gray-900);

	/* Appearance */
	background: var(--surface-light-0);
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235e7089' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-position: right 12px center;
	background-size: 16px;

	border: 1px solid var(--gray-200);
	border-radius: 6px;

	/* Remove default appearance */
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;

	/* Cursor */
	cursor: pointer;

	/* Transition */
	transition: all 0.2s ease;
}

.form-select:focus {
	outline: none;
	border-color: var(--primary-600);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(77, 208, 225, 0.15);
}

.form-select:hover:not(:disabled):not(:focus) {
	border-color: var(--gray-300);
}

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

.form-select--error:focus {
	border-color: var(--error-500);
	box-shadow: var(--shadow-md), 0 0 0 3px rgba(239, 83, 80, 0.15);
}

.form-select:disabled {
	background: var(--gray-100);
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23cbd5e0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
	border-color: var(--gray-200);
	color: var(--gray-400);
	cursor: not-allowed;
	opacity: 0.7;
}

/* Multiple select */
.form-select[multiple] {
	height: auto;
	padding: 8px 16px;
	background-image: none;
}

/* ==========================================================================
   Checkbox
   ========================================================================== */

.form-checkbox {
	display: flex;
	align-items: center;
	gap: 12px;
	cursor: pointer;
	user-select: none;
}

.form-checkbox__input {
	/* Size */
	width: 20px;
	height: 20px;
	min-width: 20px;
	flex-shrink: 0;

	/* Appearance */
	appearance: none;
	-webkit-appearance: none;
	-moz-appearance: none;

	border: 2px solid var(--gray-400);
	border-radius: 4px;
	background: transparent;

	/* Position for checkmark */
	position: relative;

	/* Cursor */
	cursor: pointer;

	/* Transition */
	transition: all 0.2s ease;
}

.form-checkbox__input:checked {
	background: var(--primary-700);
	border-color: var(--primary-700);
}

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

.form-checkbox__input:focus-visible {
	outline: 2px solid var(--primary-500);
	outline-offset: 4px;
}

.form-checkbox__input:hover:not(:disabled) {
	border-color: var(--primary-600);
}

.form-checkbox__input:disabled {
	background: var(--gray-100);
	border-color: var(--gray-300);
	cursor: not-allowed;
	opacity: 0.6;
}

.form-checkbox__input:disabled:checked {
	background: var(--gray-400);
	border-color: var(--gray-400);
}

.form-checkbox__label {
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.5;
	color: var(--text-body-dark); /* On dark bg */
	cursor: pointer;
}

.form-checkbox__input:disabled + .form-checkbox__label {
	color: var(--text-disabled-dark);
	cursor: not-allowed;
}

/* Checkbox on light surfaces */
.light-surface .form-checkbox__label {
	color: var(--text-body-light);
}

/* ==========================================================================
   Radio Button
   ========================================================================== */

.form-radio {
	display: flex;
	align-items: center;
	gap: 12px;
	cursor: pointer;
	user-select: none;
}

.form-radio__input {
	/* Size */
	width: 20px;
	height: 20px;
	min-width: 20px;
	flex-shrink: 0;

	/* Appearance */
	appearance: none;
	-webkit-appearance: none;
	-moz-appearance: none;

	border: 2px solid var(--gray-400);
	border-radius: 50%;
	background: transparent;

	/* Position for dot */
	position: relative;

	/* Cursor */
	cursor: pointer;

	/* Transition */
	transition: all 0.2s ease;
}

.form-radio__input:checked {
	border-color: var(--primary-700);
}

.form-radio__input:checked::after {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 10px;
	height: 10px;
	border-radius: 50%;
	background: var(--primary-700);
}

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

.form-radio__input:focus-visible {
	outline: 2px solid var(--primary-500);
	outline-offset: 4px;
}

.form-radio__input:hover:not(:disabled) {
	border-color: var(--primary-600);
}

.form-radio__input:disabled {
	background: var(--gray-100);
	border-color: var(--gray-300);
	cursor: not-allowed;
	opacity: 0.6;
}

.form-radio__input:disabled:checked::after {
	background: var(--gray-400);
}

.form-radio__label {
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.5;
	color: var(--text-body-dark); /* On dark bg */
	cursor: pointer;
}

.form-radio__input:disabled + .form-radio__label {
	color: var(--text-disabled-dark);
	cursor: not-allowed;
}

/* Radio on light surfaces */
.light-surface .form-radio__label {
	color: var(--text-body-light);
}

/* ==========================================================================
   Helper Text
   ========================================================================== */

.form-helper {
	display: block;
	font-family: var(--font-body);
	font-size: 12px;
	line-height: 1.5;
	color: var(--gray-500);
	margin-top: 4px;
}

.form-helper--error {
	color: var(--error-600);
}

.form-helper--success {
	color: var(--success-600);
}

.form-helper--warning {
	color: var(--warning-600);
}

/* ==========================================================================
   Input Groups (Input with Icon or Button)
   ========================================================================== */

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

.form-input-group .form-input {
	flex: 1;
}

/* Input with icon on left */
.form-input-group--icon-left .form-input {
	padding-left: 48px;
}

.form-input-group__icon-left {
	position: absolute;
	left: 16px;
	width: 20px;
	height: 20px;
	color: var(--gray-400);
	pointer-events: none;
}

/* Input with icon on right */
.form-input-group--icon-right .form-input {
	padding-right: 48px;
}

.form-input-group__icon-right {
	position: absolute;
	right: 16px;
	width: 20px;
	height: 20px;
	color: var(--gray-400);
	pointer-events: none;
}

/* Input with button */
.form-input-group--button {
	gap: 8px;
}

/* ==========================================================================
   Fieldset and Legend
   ========================================================================== */

fieldset {
	border: 1px solid var(--gray-600);
	border-radius: 8px;
	padding: 24px;
	margin-bottom: 24px;
}

legend {
	font-family: var(--font-display);
	font-size: 16px;
	font-weight: 600;
	color: var(--text-heading-dark);
	padding: 0 8px;
}

.light-surface legend {
	color: var(--text-heading-light);
}

/* ==========================================================================
   Radio/Checkbox Group
   ========================================================================== */

.form-options-group {
	display: flex;
	flex-direction: column;
	gap: 12px;
}

.form-options-group--inline {
	flex-direction: row;
	flex-wrap: wrap;
	gap: 24px;
}

/* ==========================================================================
   Form Row (Horizontal Layout)
   ========================================================================== */

.form-row {
	display: grid;
	gap: 16px;
	margin-bottom: 24px;
}

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

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

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

/* Responsive form rows */
@media (max-width: 767px) {
	.form-row--2-col,
	.form-row--3-col,
	.form-row--4-col {
		grid-template-columns: 1fr;
	}
}

/* ==========================================================================
   Search Input (Special Styling)
   ========================================================================== */

.form-search {
	position: relative;
}

.form-search .form-input {
	padding-left: 48px;
	padding-right: 48px;
}

.form-search__icon {
	position: absolute;
	left: 16px;
	top: 50%;
	transform: translateY(-50%);
	width: 20px;
	height: 20px;
	color: var(--gray-400);
	pointer-events: none;
}

.form-search__clear {
	position: absolute;
	right: 8px;
	top: 50%;
	transform: translateY(-50%);
	width: 32px;
	height: 32px;
	display: none;
	align-items: center;
	justify-content: center;
	background: transparent;
	border: none;
	border-radius: 50%;
	color: var(--gray-400);
	cursor: pointer;
	transition: all 0.2s ease;
}

.form-search__clear:hover {
	background: var(--gray-100);
	color: var(--gray-600);
}

.form-search.has-value .form-search__clear {
	display: flex;
}

/* ==========================================================================
   File Input
   ========================================================================== */

.form-file {
	position: relative;
}

.form-file__input {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.form-file__label {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	height: 48px;
	padding: 14px 24px;

	font-family: var(--font-display);
	font-size: 16px;
	font-weight: 600;

	background: transparent;
	color: var(--primary-500);
	border: 2px solid var(--primary-700);
	border-radius: 6px;

	cursor: pointer;
	transition: all 0.2s ease;
}

.form-file__label:hover {
	background: var(--primary-700);
	color: #ffffff;
}

.form-file__text {
	font-family: var(--font-body);
	font-size: 14px;
	color: var(--gray-300);
	margin-top: 8px;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 767px) {
	.form-input,
	.form-textarea,
	.form-select {
		font-size: 16px; /* Prevent zoom on iOS */
	}
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
	.form-input,
	.form-textarea,
	.form-select {
		border: 1px solid #000;
		background: #fff;
	}

	.form-checkbox__input,
	.form-radio__input {
		border: 1px solid #000;
	}
}