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*{ box-sizing: border-box; } html, body { margin: 0; padding: 0; }
:root { --sz: clamp(24px, min(4vw, 6vh) , 42px); font-size: var(--sz); --bg: #09090a; }
body { 
    background: var(--bg); 
    display: flex; flex-direction: row; gap: 1em;
    justify-content: center; align-items: center; 
    min-height: 100vh; overflow: hidden;
}
.vert { position: relative; width: 12em; height: 12em; }
.drag {
    --dvar: 0;
    --xvar: 0;
    --skew: 16;
    --line: 1px;
    --thick: 0.4rem;
    --clr: gray;
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4rem;
    cursor: grab;
    color: #fff;
    transform-style: preserve-3d;
    perspective: 1200px;
    transition: all ease-out 1s;
}
.vert.loaded .drag { transform: rotateX(calc( 1deg * ( var(--skew) - ( 2 * var(--skew) * var(--dvar)) ))); }
.rect {
    position: absolute; margin: auto;
    transform-style: preserve-3d;
    left:0; right:0;
    width: 2rem; height: 100%;
    translate: 4rem;
    transform-origin: -3rem 50%;
    box-shadow: inset 0 0 0 var(--line) var(--clr);
    background: hsl(from var(--bg) h s calc( l + 12) );
    background-size: cover; background-position: center;
    transition: all ease-out 2s;
}
.vert.loaded {
    .rect:nth-child(1)  { transform: rotateY( calc( 360deg * var(--dvar)) ) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(2)  { transform: rotateY( calc( 360deg * ( 1 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(3)  { transform: rotateY( calc( 360deg * ( 2 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(4)  { transform: rotateY( calc( 360deg * ( 3 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(5)  { transform: rotateY( calc( 360deg * ( 4 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(6)  { transform: rotateY( calc( 360deg * ( 5 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(7)  { transform: rotateY( calc( 360deg * ( 6 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(8)  { transform: rotateY( calc( 360deg * ( 7 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(9)  { transform: rotateY( calc( 360deg * ( 8 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(10) { transform: rotateY( calc( 360deg * ( 9 /11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
    .rect:nth-child(11) { transform: rotateY( calc( 360deg * ( 10/11 + var(--dvar)) )) rotateX( calc( 1deg * var(--xvar))); }
}

.rect:nth-child(1)   { background-image: url('https://picsum.photos/id/43/300');  }
.rect:nth-child(2)   { background-image: url('https://picsum.photos/id/58/300');  }
.rect:nth-child(3)   { background-image: url('https://picsum.photos/id/61/300');  }
.rect:nth-child(4)   { background-image: url('https://picsum.photos/id/79/300');  }
.rect:nth-child(5)   { background-image: url('https://picsum.photos/id/88/300');  }
.rect:nth-child(6)   { background-image: url('https://picsum.photos/id/91/300');  }
.rect:nth-child(7)   { background-image: url('https://picsum.photos/id/115/300'); }
.rect:nth-child(8)   { background-image: url('https://picsum.photos/id/121/300'); }
.rect:nth-child(9)   { background-image: url('https://picsum.photos/id/130/300'); }
.rect:nth-child(10)  { background-image: url('https://picsum.photos/id/192/300'); }
.rect:nth-child(11)  { background-image: url('https://picsum.photos/id/209/300'); }

.rect span:nth-child(1), .rect span:nth-child(2) {
    position: absolute;
    width: var(--thick); height: 100%;
    box-shadow: inset 0 0 0 var(--line) var(--clr);
    transform-origin: 0% 50%;
    background: var(--bg);
}
.rect span:nth-child(1) { transform: rotateY(-90deg); }
.rect span:nth-child(2) { transform: rotateY(-90deg); left: 100%; }
.rect span:nth-child(3), .rect span:nth-child(4) {
    position: absolute;
    width: 100%; height: var(--thick);
    box-shadow: inset 0 0 0 var(--line) var(--clr);
    transform-origin: 50% 0%;
    background: var(--bg);
}
.rect span:nth-child(3) { transform: rotateX(90deg); }
.rect span:nth-child(4) { transform: rotateX(90deg); top: 100%; }
.rect span:nth-child(5) {
    position: absolute;
    width: 100%; height: 100%;
    box-shadow: inset 0 0 0 var(--line) var(--clr);
    transform-origin: 50% 50%;
    transform: translateZ( var(--thick) );
    background: hsl(from var(--bg) h s calc( l - 12) );
}

JS

const vert = document.querySelector('.vert');
const drag = document.querySelector('.drag');
let isDragging = false;
let dragValue = 0;
let clickOffsetY = 0;
let lastTop = 0;
let lastTime = performance.now();
let smoothedVelocity = 0;
const velocityStrength = 164;
const velocityEase = 0.2;
const velocityDecay = 0.1;
let lastUpdateTime = 0;
let rafId = null;
const updateInterval = 10;

document.addEventListener("DOMContentLoaded", function() { vert.classList.add('loaded'); });

drag.addEventListener('mousedown', (e) => {
    lastInteractionTime = performance.now();
    if (idleOscillating) idleOscillating = false;
    isDragging = true;
    const dragRect = drag.getBoundingClientRect();
    clickOffsetY = e.clientY - dragRect.top;
    document.body.style.userSelect = 'none';

lastTop = drag.offsetTop;
    lastTime = performance.now();
});

document.addEventListener('mousemove', (e) => {
    lastInteractionTime = performance.now();
    if (!isDragging || rafId) return;
    if (idleOscillating) idleOscillating = false;

rafId = requestAnimationFrame(() => {
        const now = performance.now();
        const deltaTime = now - lastTime;
        const vertRect = vert.getBoundingClientRect();
        let newTop = e.clientY - vertRect.top - clickOffsetY;
        const maxTop = vert.offsetHeight - drag.offsetHeight;
        newTop = Math.max(0, Math.min(newTop, maxTop));

drag.style.top = `${newTop}px`;
        dragValue = newTop / maxTop;

if (now - lastUpdateTime >= updateInterval) {
            const cleanValue = parseFloat(dragValue.toFixed(4));
            drag.style.setProperty('--dvar', cleanValue);
            lastUpdateTime = now;
        }

const deltaPos = newTop - lastTop;
        const rawVelocity = deltaTime > 0 ? deltaPos / deltaTime : 0;
        smoothedVelocity += (rawVelocity - smoothedVelocity) * velocityEase;
        const outputVelocity = Math.max(-velocityStrength, Math.min(velocityStrength, smoothedVelocity * velocityStrength));
        drag.style.setProperty('--xvar', outputVelocity.toFixed(4));
        lastTop = newTop;
        lastTime = now;
        rafId = null;
    });
});
function easeVelocityToZero() {
    if (isDragging) {
        requestAnimationFrame(easeVelocityToZero);
        return;
    }
    smoothedVelocity += (0 - smoothedVelocity) * velocityDecay;
    const outputVelocity = smoothedVelocity * velocityStrength;

drag.style.setProperty('--xvar', outputVelocity.toFixed(4));

if (Math.abs(smoothedVelocity) > 0.001) {
        requestAnimationFrame(easeVelocityToZero);
    }
}

document.addEventListener('mouseup', () => {
    lastInteractionTime = performance.now();
    if (idleOscillating) idleOscillating = false;
    isDragging = false;
    document.body.style.userSelect = '';
    easeVelocityToZero();
});

let lastInteractionTime = performance.now();
let idleOscillating = false;
let idleStartTime = 0;

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