Фото до/после с ползунком

<section class="ba-showcase">
    <div class="ba-showcase__text">
        <span class="ba-showcase__badge">До / После</span>

        <h2>Результат видно без лишних объяснений</h2>

        <p>
            Пользователь двигает ползунок и сам сравнивает, что изменилось.
            Такой блок хорошо работает там, где важен визуальный результат.
        </p>

        <div class="ba-showcase__facts">
            <span>Ремонт</span>
            <span>Барбер</span>
            <span>Медицина</span>
            <span>Дизайн</span>
        </div>
    </div>

    <div class="ba-slider" data-before-after>
        <div class="ba-slider__image ba-slider__image--before">
            <span>До</span>
        </div>

        <div class="ba-slider__image ba-slider__image--after">
            <span>После</span>
        </div>

        <div class="ba-slider__line"></div>

        <button class="ba-slider__handle" type="button" aria-label="Передвинуть сравнение">
            <span></span>
        </button>

        <input class="ba-slider__range" type="range" min="0" max="100" value="50" aria-label="Сравнить до и после">
    </div>
</section>

.ba-showcase {
    min-height: 640px;
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 34px;
    align-items: center;
    padding: 46px;
    border-radius: 28px;
    overflow: hidden;
    background:
        radial-gradient(circle at 12% 18%, rgba(59, 130, 246, 0.28), transparent 34%),
        radial-gradient(circle at 92% 84%, rgba(236, 72, 153, 0.18), transparent 34%),
        linear-gradient(135deg, #020617, #0f172a);
}

.ba-showcase__badge {
    display: inline-flex;
    margin-bottom: 18px;
    padding: 8px 13px;
    border-radius: 999px;
    color: #bfdbfe;
    background: rgba(59, 130, 246, 0.16);
    border: 1px solid rgba(96, 165, 250, 0.45);
    font-size: 13px;
}

.ba-showcase__text h2 {
    margin: 0 0 18px;
    color: #ffffff;
    font-size: clamp(34px, 5vw, 58px);
    line-height: 1.02;
    letter-spacing: -0.05em;
}

.ba-showcase__text p {
    color: #cbd5e1;
    font-size: 17px;
    line-height: 1.7;
}

.ba-showcase__facts {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.ba-showcase__facts span {
    border: 1px solid #334155;
    border-radius: 999px;
    padding: 8px 13px;
    color: #bfdbfe;
    background: rgba(15, 23, 42, 0.7);
}

.ba-slider {
    --position: 50%;
    position: relative;
    min-height: 460px;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.3);
    border-radius: 28px;
    background: #020617;
    box-shadow: 0 30px 90px rgba(2, 6, 23, 0.55);
    isolation: isolate;
}

.ba-slider__image {
    position: absolute;
    inset: 0;
    display: grid;
    padding: 24px;
}

.ba-slider__image--before {
    place-items: end start;
}

.ba-slider__image--after {
    place-items: end end;
}

.ba-slider__image--after span {
    margin-left: auto;
}

.ba-slider__image span {
    position: relative;
    z-index: 3;
    border-radius: 999px;
    padding: 8px 14px;
    color: #ffffff;
    background: rgba(15, 23, 42, 0.72);
    border: 1px solid rgba(255, 255, 255, 0.22);
}

.ba-slider__image--before {
    background:
        linear-gradient(135deg, rgba(2, 6, 23, 0.12), rgba(2, 6, 23, 0.45)),
        repeating-linear-gradient(
            45deg,
            #334155 0 14px,
            #475569 14px 28px
        );
}

.ba-slider__image--before::after {
    content: "";
    position: absolute;
    inset: 70px 70px 90px;
    border-radius: 30px;
    background:
        linear-gradient(135deg, rgba(15, 23, 42, 0.88), rgba(30, 41, 59, 0.82));
    border: 1px dashed rgba(203, 213, 225, 0.35);
}

.ba-slider__image--after {
    z-index: 2;
    clip-path: inset(0 0 0 var(--position));
    place-items: end end;
    background:
        radial-gradient(circle at 72% 28%, rgba(255, 255, 255, 0.34), transparent 18%),
        linear-gradient(135deg, #1d4ed8, #9333ea);
}

.ba-slider__image--before {
    z-index: 1;
}

.ba-slider__image--after::before {
    content: "";
    position: absolute;
    inset: 70px 70px 90px;
    border-radius: 30px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.20), rgba(255, 255, 255, 0.06));
    border: 1px solid rgba(255, 255, 255, 0.26);
    box-shadow: 0 24px 90px rgba(37, 99, 235, 0.35);
}

.ba-slider__line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: var(--position);
    z-index: 5;
    width: 2px;
    background: rgba(255, 255, 255, 0.92);
    transform: translateX(-50%);
    box-shadow: 0 0 24px rgba(96, 165, 250, 0.75);
    pointer-events: none;
}

.ba-slider__handle {
    position: absolute;
    top: 50%;
    left: var(--position);
    z-index: 6;
    width: 56px;
    height: 56px;
    border: 1px solid rgba(255, 255, 255, 0.42);
    border-radius: 50%;
    background: rgba(15, 23, 42, 0.88);
    transform: translate(-50%, -50%);
    cursor: grab;
    box-shadow: 0 18px 50px rgba(2, 6, 23, 0.55);
}

.ba-slider__handle:active {
    cursor: grabbing;
}

.ba-slider__handle span::before,
.ba-slider__handle span::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 9px;
    height: 9px;
    border-top: 2px solid #ffffff;
    border-left: 2px solid #ffffff;
}

.ba-slider__handle span::before {
    left: 17px;
    transform: translateY(-50%) rotate(-45deg);
}

.ba-slider__handle span::after {
    right: 17px;
    transform: translateY(-50%) rotate(135deg);
}

.ba-slider__range {
    position: absolute;
    inset: 0;
    z-index: 7;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: ew-resize;
}

.ba-slider.is-moving .ba-slider__handle {
    transform: translate(-50%, -50%) scale(1.08);
}

@media (max-width: 768px) {
    .ba-showcase {
        grid-template-columns: 1fr;
        padding: 26px 18px;
    }

    .ba-slider {
        min-height: 360px;
    }

    .ba-slider__image--before::after,
    .ba-slider__image--after::before {
        inset: 54px 36px 78px;
    }
}

const beforeAfterSlider = document.querySelector("[data-before-after]");
const beforeAfterRange = beforeAfterSlider.querySelector(".ba-slider__range");

function updateBeforeAfter(value) {
    beforeAfterSlider.style.setProperty("--position", value + "%");
}

beforeAfterRange.addEventListener("input", function () {
    updateBeforeAfter(beforeAfterRange.value);
});

beforeAfterRange.addEventListener("pointerdown", function () {
    beforeAfterSlider.classList.add("is-moving");
});

beforeAfterRange.addEventListener("pointerup", function () {
    beforeAfterSlider.classList.remove("is-moving");
});

beforeAfterRange.addEventListener("pointercancel", function () {
    beforeAfterSlider.classList.remove("is-moving");
});

updateBeforeAfter(beforeAfterRange.value);