html {
  scroll-behavior: smooth;
  scroll-padding-top: 60px;
}
body {
  max-width: 960px;
  margin: 0 auto;
  background: #000;
  font-family: sans-serif;
  font-size: 1.0rem;
  color: #ccc;
  animation: fade-in 1s;
}
.bg_anime {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #000;
  z-index: -1;
  animation:
    fade-in 2s,
    bgmove 30s linear infinite;
}
.gazou {
  background-image: url("img/bghorn.webp");
  background-position: 50% 0;
  background-size: 1200px;
}
a {
  color: inherit;
}
h1 {
  margin: 60px 0;
  left: 0;
  right: 0;
  text-align: center;
}
.down {
  position: absolute;
  top: 60px;
  left: 0;
  right: 0;
  text-align: center;
}
.down2 {
  width: 100%;
  height: auto;
  max-width: 830px;
  animation:
    fade-in 2s linear 5s 1 normal both,
    blinking 1.5s ease-in-out 5s infinite alternate;
}
.tophoto {
  margin-top: 60px;
  left: 0;
  right: 0;
  text-align: center;
  z-index: -1;
}
.tophoto2 {
  width: 100%;
  height: auto;
  max-width: 830px;
  animation: top-in 10s forwards;
}
.usui {
  margin-left: 105px;
  letter-spacing: 0.05em;
  font-size: 1.2em;
}
.intro {
  margin-left: 105px;
  letter-spacing: 0.05em;
  line-height: 2;
}
.futoji {
  font-weight: bold;
}
.bio1 {
  margin: 60px 0;
  text-align: center;
}
.b1size {
  width: 100%;
  height: auto;
  max-width: 900px;
}
.PRB {
  margin: 60px 0;
  text-align: center;
}
.PRBsize {
  width: 100%;
  height: auto;
  max-width: 900px;
}
.flex1 {
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  align-items: center;
  gap: 60px 0;
}
.bio2 {
  width: 50%;
  height: auto;
  max-width: 450px;
}
.flex2 {
  width: 100%;
  margin: 60px auto 0 auto;
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.bio10 {
  width: 38%;
  height: auto;
}
.bio12 {
  width: 27%;
  height: auto;
}
.topmenu {
  position: fixed;
  box-sizing: border-box;
  width: 960px;
  height: 30px;
  top: 0;
  left: 0;
  right: 0;
  margin: 0 auto;
  padding-left: 105px;
  font-family: serif;
  display: flex;
  align-items: center;
  gap: 0 40px;
  background-color: rgb(0 0 0 / 70%);
}
.topmenu a {
  color: inherit;
  text-decoration: none;
}
.pagetop {
  position: fixed;
  bottom: 16px;
  right: 16px;
}
.foot {
  margin: 120px 0;
  text-align: center;
  font-family: serif;
  font-size: 0.8em;
}
@keyframes fade-in {
  0% {opacity: 0;}
  100% {opacity: 1;}
}
@keyframes top-in {
  0% {opacity: 0;}
  50% {opacity: 1;}
  100% {opacity: 0.6;}
}
@keyframes blinking {
  0%   {opacity: 0;}
  100% {opacity: 1;}
}
@keyframes bgmove {
  from { background-position: 50% 0;}
  to { background-position: 50% -1742px;}
}