/**
 * Form Component System
 * Standardized form input styles using design system tokens
 *
 * Related: RW-44
 * Epic: RW-3 (UI Component Library)
 * Reference: docs/UI_UX_MIGRATION_GUIDE.md Section 4.3
 */

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

.form-group {
    margin-bottom: var(--spacing-4, 1rem);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4, 1rem);
    margin-bottom: var(--spacing-4, 1rem);
}

.form-row > * {
    flex: 1;
    min-width: 200px;
}

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

.form-label {
    display: inline-block;
    margin-bottom: var(--spacing-2, 0.5rem);
    font-weight: var(--font-weight-semibold, 600);
    color: var(--color-text-primary, #212529);
    font-size: var(--font-size-sm, 0.875rem);
}

.form-label-required::after {
    content: '*';
    color: var(--color-danger, #dc3545);
    margin-left: 0.25rem;
}

/* ============================================================================
   INPUT FIELDS
   ============================================================================ */

.form-control {
    display: block;
    width: 100%;
    height: var(--input-height-base, 2.5rem);
    padding: 0.5rem 0.75rem;
    font-family: var(--font-family-sans, sans-serif);
    font-size: var(--font-size-base, 1rem);
    font-weight: var(--font-weight-normal, 400);
    line-height: 1.5;
    color: var(--color-text-primary, #212529);
    background-color: var(--input-bg, #fff);
    background-clip: padding-box;
    border: var(--border-width-thin, 1px) solid var(--input-border-color, #dee2e6);
    border-radius: var(--radius-md, 0.5rem);
    transition: border-color var(--transition-fast, 150ms), box-shadow var(--transition-fast, 150ms);
}

.form-control:focus {
    color: var(--color-text-primary, #212529);
    background-color: var(--input-bg, #fff);
    border-color: var(--input-border-color-focus, #1ea79e);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(30, 167, 158, 0.1);
}

.form-control::placeholder {
    color: var(--color-text-muted, #adb5bd);
    opacity: 1;
}

.form-control:disabled {
    background-color: var(--input-bg-disabled, #f1f3f4);
    opacity: 0.6;
    cursor: not-allowed;
}

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

.form-control-sm {
    height: var(--input-height-sm, 2rem);
    padding: 0.375rem 0.5rem;
    font-size: var(--font-size-sm, 0.875rem);
}

.form-control-lg {
    height: var(--input-height-lg, 3rem);
    padding: 0.75rem 1rem;
    font-size: var(--font-size-md, 1.125rem);
}

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

textarea.form-control {
    height: auto;
    min-height: 6rem;
    resize: vertical;
}

/* ============================================================================
   SELECT DROPDOWN
   ============================================================================ */

select.form-control {
    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='%23212529' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 12px;
    padding-right: 2.5rem;
    appearance: none;
}

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

.form-control.is-valid,
.form-control:valid {
    border-color: var(--color-success, #28a745);
    padding-right: 2.5rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2328a745' viewBox='0 0 16 16'%3E%3Cpath d='M13.854 3.646a.5.5 0 0 1 0 .708l-7 7a.5.5 0 0 1-.708 0l-3.5-3.5a.5.5 0 1 1 .708-.708L6.5 10.293l6.646-6.647a.5.5 0 0 1 .708 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px;
}

.form-control.is-valid:focus,
.form-control:valid:focus {
    border-color: var(--color-success, #28a745);
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

.form-control.is-invalid,
.form-control:invalid {
    border-color: var(--color-danger, #dc3545);
    padding-right: 2.5rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23dc3545' viewBox='0 0 16 16'%3E%3Cpath d='M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14zm0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16z'/%3E%3Cpath d='M7.002 11a1 1 0 1 1 2 0 1 1 0 0 1-2 0zM7.1 4.995a.905.905 0 1 1 1.8 0l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 4.995z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px;
}

.form-control.is-invalid:focus,
.form-control:invalid:focus {
    border-color: var(--color-danger, #dc3545);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

/* ============================================================================
   FEEDBACK TEXT
   ============================================================================ */

.form-help {
    display: block;
    margin-top: var(--spacing-1, 0.25rem);
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--color-text-secondary, #6c757d);
}

.form-error,
.invalid-feedback {
    display: block;
    margin-top: var(--spacing-1, 0.25rem);
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--color-danger, #dc3545);
    font-weight: var(--font-weight-medium, 500);
}

.form-success,
.valid-feedback {
    display: block;
    margin-top: var(--spacing-1, 0.25rem);
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--color-success, #28a745);
    font-weight: var(--font-weight-medium, 500);
}

/* ============================================================================
   CHECKBOXES & RADIOS
   ============================================================================ */

.form-check {
    display: block;
    min-height: 1.5rem;
    padding-left: 1.75rem;
    margin-bottom: 0.5rem;
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin-top: 0.125rem;
    margin-left: -1.75rem;
    vertical-align: top;
    background-color: #fff;
    border: 1px solid var(--input-border-color, #dee2e6);
    appearance: none;
    cursor: pointer;
}

.form-check-input[type="checkbox"] {
    border-radius: var(--radius-sm, 0.25rem);
}

.form-check-input[type="radio"] {
    border-radius: var(--radius-full, 50%);
}

.form-check-input:checked {
    background-color: var(--color-primary-500, #1ea79e);
    border-color: var(--color-primary-600, #18968d);
}

.form-check-input:checked[type="checkbox"] {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10l3 3 6-6'/%3E%3C/svg%3E");
}

.form-check-input:checked[type="radio"] {
    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='%23fff'/%3E%3C/svg%3E");
}

.form-check-input:focus {
    border-color: var(--color-primary-500, #1ea79e);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(30, 167, 158, 0.15);
}

.form-check-label {
    cursor: pointer;
    user-select: none;
}

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

.form-file-input {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: var(--font-size-base, 1rem);
    border: 1px solid var(--input-border-color, #dee2e6);
    border-radius: var(--radius-md, 0.5rem);
    background-color: var(--input-bg, #fff);
    cursor: pointer;
}

.form-file-input:focus {
    border-color: var(--color-primary-500, #1ea79e);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(30, 167, 158, 0.1);
}

/* ============================================================================
   INPUT GROUPS (with addons)
   ============================================================================ */

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

.input-group .form-control {
    flex: 1;
    min-width: 0;
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.75rem;
    font-size: var(--font-size-base, 1rem);
    font-weight: var(--font-weight-normal, 400);
    line-height: 1.5;
    color: var(--color-text-secondary, #6c757d);
    text-align: center;
    white-space: nowrap;
    background-color: var(--color-neutral-100, #f1f3f4);
    border: 1px solid var(--input-border-color, #dee2e6);
}

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

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

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

.form-floating {
    position: relative;
}

.form-floating > .form-control {
    height: calc(3.5rem + 2px);
    padding: 1rem 0.75rem;
}

.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: opacity var(--transition-fast, 150ms), transform var(--transition-fast, 150ms);
    color: var(--color-text-muted, #adb5bd);
}

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