/*物体上昇BG*/

body{
    font-family: 'Exo', sans-serif;
}


.context {
    width: 100%;
    position: absolute;
    top:50vh;
    
}

.context h1{
    text-align: center;
    color: #fff;
    font-size: 50px;
}


.area{
    background: #99afb0;  
    background: -webkit-linear-gradient(to left, #c6f8f8, #99afb0);  
    width: 100%;
    height:100vh;
    
   
}

.circles{
    position: absolute;
    top: 0;
    left: 0;
    /*width: 100%;*/
    right: 0;   /* ← これが重要 */
  margin: 0;
  padding: 0;
    height: 100%;
    overflow: hidden;
}

.circles li{
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 25s linear infinite;
    bottom: -150px;
    
}

.circles li:nth-child(1){
    left: 25%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles li:nth-child(2){
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles li:nth-child(3){
    left: 70%;
    width: 20px;
    height: 20px;
    animation-delay: 4s;
}

.circles li:nth-child(4){
    left: 40%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 18s;
}

.circles li:nth-child(5){
    left: 65%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles li:nth-child(6){
    left: 75%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles li:nth-child(7){
    left: 35%;
    width: 150px;
    height: 150px;
    animation-delay: 7s;
}

.circles li:nth-child(8){
    left: 50%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles li:nth-child(9){
    left: 20%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles li:nth-child(10){
    left: 85%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}



@keyframes animate {

    0%{
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }

    100%{
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }

}



/* ==============================
   スマホ対応（最大幅430px以下）
============================== */
@media screen and (max-width: 430px) {

  
  /* ------------------------------
     背景アニメーションの円
  ------------------------------ */
  .area ul.circles li {
    width: 40px;   /* 小さく */
    height: 40px;  /* 小さく */
  }



}