.scroll-progress-button {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.92);
    color: #ff4f73;
    cursor: pointer;
    z-index: 9999;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.scroll-progress-button.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-progress-button:hover,
.scroll-progress-button:focus {
    color: #ff315f;
    box-shadow: 0 10px 28px rgba(255, 79, 115, 0.22);
    outline: none;
}

.scroll-progress-button__svg {
    display: block;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.scroll-progress-button__track,
.scroll-progress-button__bar {
    fill: none;
    stroke-width: 2.4;
}

.scroll-progress-button__track {
    stroke: rgba(255, 79, 115, 0.22);
}

.scroll-progress-button__bar {
    stroke: currentColor;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.08s linear;
}

.scroll-progress-button__icon {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 14px;
    height: 14px;
    border-left: 2px solid currentColor;
    border-top: 2px solid currentColor;
    transform: translate(-50%, -35%) rotate(45deg);
}

@media (max-width: 575.98px) {
    .scroll-progress-button {
        right: 16px;
        bottom: 18px;
        width: 44px;
        height: 44px;
    }
}