/* Bubble animation keyframes */
@keyframes animateBubble {
    0% {
        margin-top: 1000px;
    }

    100% {
        margin-top: -100%;
    }
}

@keyframes sideWays {
    0% {
        margin-left: 0px;
    }

    100% {
        margin-left: 50px;
    }
}

/* Bubble base */
.bubble {
    position: absolute;
    border-radius: 50%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255,255,150,0.5) 0%, rgba(255,255,255,0.1) 40%, transparent 70%);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.2), inset 0 0 50px rgba(255, 255, 150, 0.5), inset 0 10px 30px rgba(255, 255, 255, 0.8);
}

    .bubble::after {
        content: "";
        position: absolute;
        top: 10px;
        left: 10px;
        width: 180px;
        height: 180px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(255,255,200,0.4) 0%, rgba(255,255,255,0) 70%);
        box-shadow: inset 0 20px 30px rgba(255, 255, 255, 0.3);
    }

/* Position + animation for each bubble */
.x1 {
    animation: animateBubble 25s linear infinite, sideWays 2s ease-in-out infinite alternate;
    left: -5%;
    top: 5%;
    transform: scale(0.6);
}

.x2 {
    animation: animateBubble 20s linear infinite, sideWays 4s ease-in-out infinite alternate;
    left: 5%;
    top: 80%;
    transform: scale(0.4);
}

.x3 {
    animation: animateBubble 28s linear infinite, sideWays 2s ease-in-out infinite alternate;
    left: 10%;
    top: 40%;
    transform: scale(0.7);
}

.x4 {
    animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;
    left: 20%;
    top: 0;
    transform: scale(0.3);
}

.x5 {
    animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;
    left: 30%;
    top: 50%;
    transform: scale(0.5);
}

.x6 {
    animation: animateBubble 21s linear infinite, sideWays 2s ease-in-out infinite alternate;
    left: 50%;
    top: 0;
    transform: scale(0.8);
}

.x7 {
    animation: animateBubble 20s linear infinite, sideWays 2s ease-in-out infinite alternate;
    left: 65%;
    top: 70%;
    transform: scale(0.4);
}

.x8 {
    animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;
    left: 80%;
    top: 10%;
    transform: scale(0.3);
}

.x9 {
    animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;
    left: 90%;
    top: 50%;
    transform: scale(0.6);
}

.x10 {
    animation: animateBubble 26s linear infinite, sideWays 2s ease-in-out infinite alternate;
    left: 80%;
    top: 80%;
    transform: scale(0.3);
}