html {
    box-sizing: border-box;
}

*, *::before, *::after {
    box-sizing: inherit;
}


/*кнопка вверъ*/
#scrollBtn{
    display: flex;
    align-items: center;
    justify-content: center;

    position: fixed;
    cursor: pointer;
    border-radius: 999px;
    backdrop-filter: blur(5px);
    border: 1px solid #0000004b;
    color: rgba(212, 212, 212, 0.457);
    background: rgba(41, 41, 41, 0.616);
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.708);

    width: 50px;
    height: 50px;

    bottom: 235px;

    margin: 5px;
    transition: all 0.3s;

    z-index: 999;
    
    opacity: 0;
    pointer-events: !important;
    touch-action: manipulation;
}
#scrollBtn:hover, 
#scrollBtn:focus{
	background: rgba(41, 41, 41, 0.8);
	z-index: 4;
}
#scrollBtn:hover::before,
#scrollBtn:focus::before{
	transform: translate(-50%, -50%) scale(1);
}
#scrollBtn::before{
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    opacity: 0.5;
    border-radius: 999px;

	width: calc(100% + 8px);
	height: calc(100% + 8px);

    background: linear-gradient(45deg, rgba(95, 95, 95, 0.3), rgba(0, 0, 0, 0.5));
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.3s;
    z-index: 445;
}

#scrollBtn.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}



/* базовая стеклянная кнопка */
.buttonLiquidGlassStyle{
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.33);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(0, 0, 0, 0.51);
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.97);
    cursor: pointer;
    z-index: 10;

    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border-radius: 999px;
    color: rgba(255,255,255,0.85);
    -webkit-backdrop-filter: blur(10px);
    outline: none;
    transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.buttonLiquidGlassStyle::before{
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    border-radius: 999px;
    opacity: 0.5;
    width: calc(100% + 6px);
    height: calc(100% + 6px);
    background: linear-gradient(45deg, rgba(95, 95, 95, 0.3), rgba(0, 0, 0, 0.5));
    
    transform: translate(-50%, -50%) scale(0);
    pointer-events: none;
    transition: transform 0.3s;
    z-index: 0;
    
    background: linear-gradient(45deg, rgba(255,255,255,0.18), rgba(0,0,0,0.35));
    transition: transform 0.25s ease;
    pointer-events: none;
    z-index: 0;
}

.buttonLiquidGlassStyle:hover{
    background: rgba(255,255,255,0.12);
    transform: translateY(-1px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.65);
}

.buttonLiquidGlassStyle:hover::before{
    transform: translate(-50%, -50%) scale(1);
}

.buttonLiquidGlassStyle img{
    z-index: 1;
    pointer-events: none;
}


@media (max-width: 768px) {
    #scrollBtn {
        bottom: 16px;
        right: 16px;
    }
}

@media (max-width: 480px) {
    #scrollBtn {
        top: 0px;
        right: 5px;
    }
}