#scroll-top {
    position: fixed;
    bottom: 28px;
    right: 96px;

    z-index: 60;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(2, 6, 23, 0.9);
    border: 1px solid rgba(96, 165, 250, 0.35);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    opacity: 0;
    transform: translateY(12px) scale(0.8);
    pointer-events: none;

    transition:
        opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        border-color 0.3s ease,
        box-shadow 0.3s ease;
}

#scroll-top.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

#scroll-top:hover {
    border-color: rgba(96, 165, 250, 0.8);
    box-shadow:
        0 0 20px rgba(59, 130, 246, 0.5),
        0 0 60px rgba(59, 130, 246, 0.15);
    transform: translateY(-4px) scale(1.1);
}

#scroll-top:active {
    transform: scale(0.93);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

#scroll-top svg {
    position: relative;
    z-index: 2;
    flex-shrink: 0;
}

.scroll-top-ring {
    position: absolute;
    inset: -5px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;

    background: conic-gradient(
        rgba(96, 165, 250, 0.8) var(--progress, 0%),
        rgba(255, 255, 255, 0.07) var(--progress, 0%)
    );
    mask: radial-gradient(farthest-side, transparent calc(100% - 3px), black calc(100% - 3px));
    -webkit-mask: radial-gradient(
        farthest-side,
        transparent calc(100% - 3px),
        black calc(100% - 3px)
    );
}

@media (max-width: 640px) {
    #scroll-top {
        right: 24px;
        bottom: 160px;
    }
}

@media (max-width: 640px) {
    #scroll-top {
        display: none !important;
    }
}