/* ═══════════════════════════════════════════════
   rhx-checkbox — Custom checkbox component
   ═══════════════════════════════════════════════ */

/* ── Screen-reader-only utility ── */
.rhx-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ── Block ── */
.rhx-checkbox {
    display: inline-flex;
    flex-direction: column;
    gap: var(--rhx-space-xs);
}

/* ── Label wrapper (clickable row) ── */
.rhx-checkbox__label {
    display: inline-flex;
    align-items: center;
    gap: var(--rhx-space-sm);
    cursor: pointer;
    user-select: none;
    font-size: var(--rhx-font-size-sm);
    color: var(--rhx-color-text);
    line-height: var(--rhx-leading-normal);
}

/* ── Custom visual control ── */
.rhx-checkbox__control {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
    border: 2px solid var(--rhx-color-border);
    border-radius: var(--rhx-radius-sm);
    background: var(--rhx-color-surface);
    color: white;
    transition: background-color 150ms ease, border-color 150ms ease;
}

/* ── Check and dash icons (hidden by default) ── */
.rhx-checkbox__check,
.rhx-checkbox__dash {
    display: none;
    width: 0.75rem;
    height: 0.75rem;
}

/* ── Checked state (via CSS sibling combinator) ── */
.rhx-checkbox__native:checked ~ .rhx-checkbox__control {
    background: var(--rhx-color-brand-500);
    border-color: var(--rhx-color-brand-500);
}

.rhx-checkbox__native:checked ~ .rhx-checkbox__control .rhx-checkbox__check {
    display: block;
}

/* ── Indeterminate state ── */
[data-rhx-indeterminate] .rhx-checkbox__control {
    background: var(--rhx-color-brand-500);
    border-color: var(--rhx-color-brand-500);
}

[data-rhx-indeterminate] .rhx-checkbox__dash {
    display: block;
}

[data-rhx-indeterminate] .rhx-checkbox__check {
    display: none;
}

/* ── Focus ring ── */
.rhx-checkbox__native:focus-visible ~ .rhx-checkbox__control {
    outline: 2px solid var(--rhx-color-brand-500);
    outline-offset: 2px;
}

/* ── Hover ── */
.rhx-checkbox__label:hover .rhx-checkbox__control {
    border-color: var(--rhx-color-brand-400);
}

.rhx-checkbox__native:checked ~ .rhx-checkbox__control:hover,
.rhx-checkbox__label:hover .rhx-checkbox__native:checked ~ .rhx-checkbox__control {
    background: var(--rhx-color-brand-600);
    border-color: var(--rhx-color-brand-600);
}

/* ── Label text ── */
.rhx-checkbox__text {
    font-size: var(--rhx-font-size-sm);
    color: var(--rhx-color-text);
}

/* ── Hint ── */
.rhx-checkbox__hint {
    font-size: var(--rhx-font-size-xs);
    color: var(--rhx-color-text-muted);
    padding-left: calc(1.25rem + var(--rhx-space-sm));
}

/* ── Error ── */
.rhx-checkbox__error {
    font-size: var(--rhx-font-size-xs);
    color: var(--rhx-color-danger-500);
    padding-left: calc(1.25rem + var(--rhx-space-sm));
}

/* ── Disabled ── */
.rhx-checkbox--disabled {
    opacity: 0.5;
}

.rhx-checkbox--disabled .rhx-checkbox__label {
    cursor: default;
    pointer-events: none;
}

/* ── Error modifier ── */
.rhx-checkbox--error .rhx-checkbox__control,
.rhx-checkbox[data-rhx-invalid] .rhx-checkbox__control {
    border-color: var(--rhx-color-danger-500);
}

/* ── Size: small ── */
.rhx-checkbox--small .rhx-checkbox__control {
    width: 1rem;
    height: 1rem;
}

.rhx-checkbox--small .rhx-checkbox__check,
.rhx-checkbox--small .rhx-checkbox__dash {
    width: 0.625rem;
    height: 0.625rem;
}

.rhx-checkbox--small .rhx-checkbox__text {
    font-size: var(--rhx-font-size-xs);
}

.rhx-checkbox--small .rhx-checkbox__hint,
.rhx-checkbox--small .rhx-checkbox__error {
    padding-left: calc(1rem + var(--rhx-space-sm));
}

/* ── Size: large ── */
.rhx-checkbox--large .rhx-checkbox__control {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: var(--rhx-radius-md);
}

.rhx-checkbox--large .rhx-checkbox__check,
.rhx-checkbox--large .rhx-checkbox__dash {
    width: 1rem;
    height: 1rem;
}

.rhx-checkbox--large .rhx-checkbox__text {
    font-size: var(--rhx-font-size-md);
}

.rhx-checkbox--large .rhx-checkbox__hint,
.rhx-checkbox--large .rhx-checkbox__error {
    padding-left: calc(1.5rem + var(--rhx-space-sm));
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
    .rhx-checkbox__control {
        transition: none;
    }
}