.page {
    max-width: 421px;
    max-height: 932px;
}

#game {
    display: block;
}

#lake {
    position: relative;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #4facfe 0%, #00f2fe 100%);
    overflow: hidden;
    /* animation: wave 5s linear infinite; */
}

@keyframes wave {
    0% { background-position: 0 bottom; }
    100% { background-position: 100% bottom; }
}

.fish {
  user-select: none;
  -webkit-tap-highlight-color: transparent;
    -webkit-user-select: none;
    position: absolute;
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
    z-index: 10;
    transform: translate3d(0, 0, 0); /* force hardware acceleration */
    will-change: transform; /* optimize for animations */
}

.fish:focus {
  outline: none;
}

.swimLeft {
    animation: swim 3s linear forwards;
}

.swimRight {
    transform: scaleX(-1);
    animation: swimRight 3s linear forwards;
}

/*
@keyframes swim {
    0%, 100% {
        transform: translate3d(0, 5px, 0);
    }
    50% {
        transform: translate3d(-20px, -5px, 0);
    }
}
*/
@keyframes swim {
    0% {
        transform: translate3d(0, 0, 0);
    }
    100% {
        /* opacity: 0; */
        transform: translate3d(-20px, -5px, 0);
    }
}


@keyframes swimRight {
    0% {
        transform: scaleX(-1) translate3d(0, 0, 0);
    }
    100% {
        /* opacity: 0; */
        transform: scaleX(-1) translate3d(-20px, -5px, 0);
    }
}

@keyframes disappear {
    to {
        opacity: 0;
        scale: 0;
    }
}

.disappeared {
    animation: disappear 0.3s forwards; /* 'forwards' makes the end state of the animation persist */
}

.star {
    position: absolute; /* consider if absolute positioning can be used */
    font-size: 32px;
    color: gold;
    pointer-events: none;
    opacity: 0; /* Start invisible */
    transform: translate3d(0, 0, 0); /* Hardware acceleration */
    will-change: transform, opacity; /* Optimize for these properties */
}

@keyframes flyAndFade {
    0% {
        opacity: 1;
        transform: translate3d(0, 0, 0); /* Use 3D transform for optimization */
    }
    100% {
        opacity: 0;
        transform: translate3d(0, -50px, 0); /* Hardware accelerated movement */
    }
}

.star.fly {
    animation: flyAndFade 0.5s ease forwards;
}


/* KEYFRAMES */

@-webkit-keyframes animateBubble {
    0% {
        margin-top: 1000px;
    }
    100% {
        margin-top: -100%;
    }
}

@-moz-keyframes animateBubble {
    0% {
        margin-top: 1000px;
    }
    100% {
        margin-top: -100%;
    }
}

@keyframes animateBubble {
    0% {
        margin-top: 1000px;
    }
    100% {
        margin-top: -100%;
    }
}

@-webkit-keyframes sideWays {
    0% {
        margin-left:0px;
    }
    100% {
        margin-left:50px;
    }
}

@-moz-keyframes sideWays {
    0% {
        margin-left:0px;
    }
    100% {
        margin-left:50px;
    }
}

@keyframes sideWays {
    0% {
        margin-left:0px;
    }
    100% {
        margin-left:50px;
    }
}

/* ANIMATIONS */

.x1 {
    -webkit-animation: animateBubble 25s linear infinite, sideWays 2s ease-in-out infinite alternate;
    -moz-animation: animateBubble 25s linear infinite, sideWays 2s ease-in-out infinite alternate;
    animation: animateBubble 25s linear infinite, sideWays 2s ease-in-out infinite alternate;

    left: -5%;
    top: 5%;

    -webkit-transform: scale(0.6) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.6) translate3d(0, 0, 0);
    transform: scale(0.6) translate3d(0, 0, 0);
}

.x2 {
    -webkit-animation: animateBubble 20s linear infinite, sideWays 4s ease-in-out infinite alternate;
    -moz-animation: animateBubble 20s linear infinite, sideWays 4s ease-in-out infinite alternate;
    animation: animateBubble 20s linear infinite, sideWays 4s ease-in-out infinite alternate;

    left: 5%;
    top: 80%;

    -webkit-transform: scale(0.4) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.4) translate3d(0, 0, 0);
    transform: scale(0.4) translate3d(0, 0, 0);
}

.x3 {
    -webkit-animation: animateBubble 28s linear infinite, sideWays 2s ease-in-out infinite alternate;
    -moz-animation: animateBubble 28s linear infinite, sideWays 2s ease-in-out infinite alternate;
    animation: animateBubble 28s linear infinite, sideWays 2s ease-in-out infinite alternate;

    left: 10%;
    top: 40%;

    -webkit-transform: scale(0.7) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.7) translate3d(0, 0, 0);
    transform: scale(0.7) translate3d(0, 0, 0);
}

.x4 {
    -webkit-animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;
    -moz-animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;
    animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;

    left: 20%;
    top: 0;

    -webkit-transform: scale(0.3) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.3) translate3d(0, 0, 0);
    transform: scale(0.3) translate3d(0, 0, 0);
}

.x5 {
    -webkit-animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;
    -moz-animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;
    animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;

    left: 30%;
    top: 50%;

    -webkit-transform: scale(0.5) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.5) translate3d(0, 0, 0);
    transform: scale(0.5) translate3d(0, 0, 0);
}

.x6 {
    -webkit-animation: animateBubble 21s linear infinite, sideWays 2s ease-in-out infinite alternate;
    -moz-animation: animateBubble 21s linear infinite, sideWays 2s ease-in-out infinite alternate;
    animation: animateBubble 21s linear infinite, sideWays 2s ease-in-out infinite alternate;

    left: 50%;
    top: 0;

    -webkit-transform: scale(0.8) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.8) translate3d(0, 0, 0);
    transform: scale(0.8) translate3d(0, 0, 0);
}

.x7 {
    -webkit-animation: animateBubble 20s linear infinite, sideWays 2s ease-in-out infinite alternate;
    -moz-animation: animateBubble 20s linear infinite, sideWays 2s ease-in-out infinite alternate;
    animation: animateBubble 20s linear infinite, sideWays 2s ease-in-out infinite alternate;

    left: 65%;
    top: 70%;

    -webkit-transform: scale(0.4) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.4) translate3d(0, 0, 0);
    transform: scale(0.4) translate3d(0, 0, 0);
}

.x8 {
    -webkit-animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;
    -moz-animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;
    animation: animateBubble 22s linear infinite, sideWays 3s ease-in-out infinite alternate;

    left: 80%;
    top: 10%;

    -webkit-transform: scale(0.3) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.3) translate3d(0, 0, 0);
    transform: scale(0.3) translate3d(0, 0, 0);
}

.x9 {
    -webkit-animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;
    -moz-animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;
    animation: animateBubble 29s linear infinite, sideWays 4s ease-in-out infinite alternate;

    left: 90%;
    top: 50%;

    -webkit-transform: scale(0.6) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.6) translate3d(0, 0, 0);
    transform: scale(0.6) translate3d(0, 0, 0);
}

.x10 {
    -webkit-animation: animateBubble 26s linear infinite, sideWays 2s ease-in-out infinite alternate;
    -moz-animation: animateBubble 26s linear infinite, sideWays 2s ease-in-out infinite alternate;
    animation: animateBubble 26s linear infinite, sideWays 2s ease-in-out infinite alternate;

    left: 80%;
    top: 80%;

    -webkit-transform: scale(0.3) translate3d(0, 0, 0); /* Add translate3d for hardware acceleration */
    -moz-transform: scale(0.3) translate3d(0, 0, 0);
    transform: scale(0.3) translate3d(0, 0, 0);
}

/* OBJECTS */

.bubble {
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;

    -webkit-box-shadow: 0 20px 30px rgba(0, 0, 0, 0.2), inset 0px 10px 30px 5px rgba(255, 255, 255, 1);
    -moz-box-shadow: 0 20px 30px rgba(0, 0, 0, 0.2), inset 0px 10px 30px 5px rgba(255, 255, 255, 1);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.2), inset 0px 10px 30px 5px rgba(255, 255, 255, 1);

    height: 200px;
    position: absolute;
    width: 200px;

    z-index: 40;
}

.bubble:after {
    background: -moz-radial-gradient(center, ellipse cover,  rgba(255,255,255,0.5) 0%, rgba(255,255,255,0) 70%); /* FF3.6+ */
    background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,rgba(255,255,255,0.5)), color-stop(70%,rgba(255,255,255,0))); /* Chrome,Safari4+ */
    background: -webkit-radial-gradient(center, ellipse cover,  rgba(255,255,255,0.5) 0%,rgba(255,255,255,0) 70%); /* Chrome10+,Safari5.1+ */
    background: -o-radial-gradient(center, ellipse cover,  rgba(255,255,255,0.5) 0%,rgba(255,255,255,0) 70%); /* Opera 12+ */
    background: -ms-radial-gradient(center, ellipse cover,  rgba(255,255,255,0.5) 0%,rgba(255,255,255,0) 70%); /* IE10+ */
    background: radial-gradient(ellipse at center,  rgba(255,255,255,0.5) 0%,rgba(255,255,255,0) 70%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#80ffffff', endColorstr='#00ffffff',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */

    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;

    -webkit-box-shadow: inset 0 20px 30px rgba(255, 255, 255, 0.3);
    -moz-box-shadow: inset 0 20px 30px rgba(255, 255, 255, 0.3);
    box-shadow: inset 0 20px 30px rgba(255, 255, 255, 0.3);

    content: "";
    height: 180px;
    left: 10px;
    position: absolute;
    width: 180px;
}

#plants {
    position: absolute;
    bottom: 0;
    height: 15%;
    max-height: 150px;
    width: 100%;
    background-image: url("../img/seaweed2.png");
    background-repeat: repeat-x;
    background-size: contain;
    background-position: bottom;
    z-index: 30;
}