/* Root of the spinner */
.twp {
    --twp-item-h: 40px;
    /* default item height (synced by JS) */
    --twp-view-h: 200px;
    /* viewport height (synced by JS) */
    --twp-vpad: 80px;
    /* top/bottom padding inside each column (synced by JS) */
    --twp-col-w: 72px;
    /* column width; adapt via media queries if needed */
    --twp-guide-color: rgba(56, 189, 248, .7);
    --twp-guide-w: 2px;
    /* line thickness */

    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    /* horizontal only (avoid vertical shift of mid lines) */
    position: relative;
    max-width: 100%;
}

/* Put columns inside a viewport with exact height */
.twp-viewport {
    position: relative;
    height: var(--twp-view-h);
    display: flex;
    align-items: stretch;
    gap: 8px;
}

/* Hide native GF fields but keep them in the DOM for submit/validation */
.twp-hide-native {
    position: absolute !important;
    left: -9999px !important;
    width: 1px !important;
    height: 1px !important;
    opacity: 0 !important;
    pointer-events: none !important;
}

/* Each column */
.twp-col {
    width: var(--twp-col-w);
    min-width: var(--twp-col-w);
    overflow-y: auto;
    padding-top: var(--twp-vpad);
    padding-bottom: var(--twp-vpad);
    scroll-behavior: smooth;
    /* smooth programmatic scrolling */
    -webkit-overflow-scrolling: touch;
    /* momentum on iOS */
    scrollbar-width: none;
    /* Firefox hide scrollbar */
    -ms-overflow-style: none;
    /* old Edge/IE */
    will-change: scroll-position;
    scroll-snap-type: y mandatory;

    position: relative;
    background-image:
        linear-gradient(to bottom,
            transparent calc(50% - var(--twp-item-h)/2 - var(--twp-guide-w)/2),
            var(--twp-guide-color) calc(50% - var(--twp-item-h)/2 - var(--twp-guide-w)/2),
            var(--twp-guide-color) calc(50% - var(--twp-item-h)/2 + var(--twp-guide-w)/2),
            transparent calc(50% - var(--twp-item-h)/2 + var(--twp-guide-w)/2)),
        linear-gradient(to bottom,
            transparent calc(50% + var(--twp-item-h)/2 - var(--twp-guide-w)/2),
            var(--twp-guide-color) calc(50% + var(--twp-item-h)/2 - var(--twp-guide-w)/2),
            var(--twp-guide-color) calc(50% + var(--twp-item-h)/2 + var(--twp-guide-w)/2),
            transparent calc(50% + var(--twp-item-h)/2 + var(--twp-guide-w)/2));
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-position: 0 0;
}

.twp-col::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;
}

/* Chrome/Safari */

.twp-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.twp-col li {
    height: var(--twp-item-h);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    line-height: 1;
    color: #6b7280;
    transition: transform .12s ease, color .12s ease, font-weight .12s ease;
    scroll-snap-align: center;
    scroll-snap-stop: always;
    line-height: var(--twp-item-h);
}

.twp-col li.twp-active {
    color: #111827;
    font-weight: 600;
    transform: scale(1.06);
}

.twp-sep {
    align-self: center;
    font-weight: 600;
    font-size: 22px;
    color: #6b7280;
}

/* Responsive width example */
@media (max-width: 480px) {
    .twp {
        --twp-col-w: 56px;
    }
}