*{
  margin: 0;
  padding: 0;
  color: inherit;
  text-decoration: none;
  font-style: normal;
  font-family: inherit;
  font-size: inherit;
  list-style: none;
  box-sizing: border-box;
  border-collapse: collapse;
  outline: inherit;
}

:root{
  --blue:#2E5077;
  --green:#4DA1A9;
  --deep-green:#1c7178;
  --light-green:#79D7BE;
  --ivory:#F6F4F0;
}

html{
  width: 100%;
  height: 100%;
  height: -webkit-fill-available;
  font-size: 10px;
}

body{
  height: 100dvh;
  color: #000;
  line-height: 1.8;
  font-family: "Noto Sans JP", sans-serif;
  background: var(--green);
}

.container{
  width: 600px;
  height: 100%;
  height: 100dvh;
  margin: 0 auto;
  position: relative;
}

h1{
  font-size: 4rem;
  text-shadow: 0px 0px 3px rgba(0, 0, 0, 0.5);
}

.flex{
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

a{
  display: block;
}

img{
  max-width: 100%;
}

/* -----------------------トップページ----------------------- */
.top_page{
  color: var(--ivory);
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  z-index: 1000;
}

.select_btn{
  width: 250px;
  margin: 30px auto 0;
  justify-content: center;
}

.select_btn li{
  width: 100%;
  animation: fadeInSlideUp 1s ease-in-out;
}
@keyframes fadeInSlideUp {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.select_btn li a{
  font-size: 1.8rem;
  font-weight: bold;
  background: var(--ivory);
  color: var(--deep-green);
  border-radius: 10px;
  box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.5);
  padding: 10px 0;
  margin: 10px 0;
  position: relative;
}

.select_btn li a:hover{
  background: var(--deep-green);
  color: var(--ivory);
}

.select_btn li a i{
  color: var(--deep-green);
  font-size: 3rem;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
}

.select_btn li a:hover i{
  background: var(--deep-green);
  color: var(--ivory);
}

/* -----------------------背景アニメーション----------------------- */
@keyframes move_wave {
  0% {
      transform: translateX(0) translateZ(0) scaleY(1)
  }
  50% {
      transform: translateX(-25%) translateZ(0) scaleY(0.55)
  }
  100% {
      transform: translateX(-50%) translateZ(0) scaleY(1)
  }
}
.waveWrapper {
  overflow: hidden;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  margin: auto;
}
.waveWrapperInner {
  position: absolute;
  width: 100%;
  overflow: hidden;
  height: 100%;
  bottom: -1px;
  background-image: linear-gradient(to top, #79D7BE 20%, #4DA1A9 80%);
}
.bgTop {
  z-index: 15;
  opacity: 0.3;
}
.bgMiddle {
  z-index: 10;
  opacity: 0.5;
}
.bgBottom {
  z-index: 5;
}
.wave {
  position: absolute;
  left: 0;
  width: 200%;
  height: 100%;
  background-repeat: repeat no-repeat;
  background-position: 0 bottom;
  transform-origin: center bottom;
}
.waveTop {
  background-size: 50% 100px;
}
.waveAnimation .waveTop {
animation: move-wave 3s;
 -webkit-animation: move-wave 3s;
 -webkit-animation-delay: 1s;
 animation-delay: 1s;
}
.waveMiddle {
  background-size: 50% 120px;
}
.waveAnimation .waveMiddle {
  animation: move_wave 10s linear infinite;
}
.waveBottom {
  background-size: 50% 100px;
}
.waveAnimation .waveBottom {
  animation: move_wave 15s linear infinite;
}

@media screen and (max-width: 700px) {
  .container{
    width: 100%;
  }
  
  h1{
    font-size: 3rem;
  }

  /* -----------------------トップページ----------------------- */
  .select_btn{
    width: 220px;
  }

  .select_btn li{
    width: 90%;
  }

  .select_btn li a{
    font-size: 1.6rem;
    padding: 10px 0;
  }

  .select_btn li a i{
    font-size: 2.5rem;
  }
}