/* BUBBLES */
.bubbles {
    position: absolute;
    inset: 0;
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    pointer-events: none;
}

.bubbles span {
    position: relative;
    bottom: -150px;
    width: 20px;
    height: 20px;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    animation: rise calc(60s / var(--i)) linear infinite;
    backdrop-filter: blur(4px);
}

.bubbles span::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.8), rgba(255,255,255,0.2));
}

.bubbles span:nth-child(3n) {
    width: 30px;
    height: 30px;
}

.bubbles span:nth-child(4n) {
    width: 15px;
    height: 15px;
}

@keyframes rise {
    0% {
        transform: translateY(0) scale(1);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    100% {
        transform: translateY(-900px) scale(1.2);
        opacity: 0;
    }
}