@charset "utf-8";
/* 初期設定 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  list-style: none;
}

img {
  width: 100%;
  height: auto;
  vertical-align: baseline;
}

/* ハンバーガーメニュー */
html {
  box-sizing: border-box;
}

a {
  color: #fff;
  text-decoration: none;
}

html {
  width: 100%;
  height: 100%;
}

body {
  background: #161616;
  width: 100%;
  height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  color: #fff;
}


.open {
  z-index: 18;
  position: fixed;
  top: 40px;
  right: 40px;
  width: 50px;
  height: 50px;
  display: block;
  cursor: pointer;
  transition: opacity 0.2s linear;
}
.open:hover {
  opacity: 0.8;
}
.open span {
  display: block;
  float: left;
  clear: both;
  height: 4px;
  width: 40px;
  border-radius: 40px;
  background-color: #fff;
  position: absolute;
  right: 3px;
  top: 3px;
  overflow: hidden;
  transition: all 0.4s ease;
}
.open span:nth-child(1) {
  margin-top: 10px;
  z-index: 9;
}
.open span:nth-child(2) {
  margin-top: 25px;
}
.open span:nth-child(3) {
  margin-top: 40px;
}

.sub-menu {
  transition: all 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  height: 0;
  width: 0;
  right: 0;
  top: 0;
  position: absolute;
  background-color: rgba(38, 84, 133, 0.54);
  border-radius: 50%;
  z-index: 18;
  overflow: hidden;
}
.sub-menu li {
  display: block;
  float: right;
  clear: both;
  height: auto;
  margin-right: -160px;
  transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.sub-menu li:first-child {
  margin-top: 180px;
}
.sub-menu li:nth-child(1) {
  -webkit-transition-delay: 0.05s;
  transition-delay: 0.05s;
}
.sub-menu li:nth-child(2) {
  -webkit-transition-delay: 0.1s;
  transition-delay: 0.1s;
}
.sub-menu li:nth-child(3) {
  -webkit-transition-delay: 0.15s;
  transition-delay: 0.15s;
}
.sub-menu li:nth-child(4) {
  -webkit-transition-delay: 0.2s;
  transition-delay: 0.2s;
}
.sub-menu li:nth-child(5) {
  -webkit-transition-delay: 0.25s;
  transition-delay: 0.25s;
}
.sub-menu li a {
  color: #fff;
  font-family: "Lato", Arial, Helvetica, sans-serif;
  font-size: 16px;
  width: 100%;
  display: block;
  float: left;
  line-height: 40px;
}

.oppenned .sub-menu {
  opacity: 1;
  height: 400px;
  width: 400px;
}
.oppenned span:nth-child(2) {
  overflow: visible;
}
.oppenned span:nth-child(1),
.oppenned span:nth-child(3) {
  z-index: 100;
  transform: rotate(45deg);
}
.oppenned span:nth-child(1) {
  transform: rotate(45deg) translateY(12px) translateX(12px);
}
.oppenned span:nth-child(2) {
  height: 400px;
  width: 400px;
  right: -160px;
  top: -160px;
  border-radius: 50%;
  background-color: rgba(115, 172, 232, 0.497);
}
.oppenned span:nth-child(3) {
  transform: rotate(-45deg) translateY(-10px) translateX(10px);
}
.oppenned li {
  margin-right: 168px;
}

.button {
  display: block;
  float: left;
  clear: both;
  padding: 20px 40px;
  background: #fff;
  border-radius: 3px;
  border: 2px solid #10a1ea;
  overflow: hidden;
  position: relative;
}
.button:after {
  transition: transform 0.3s ease;
  content: "";
  position: absolute;
  height: 200px;
  width: 400px;
  transform: rotate(45deg) translateX(-540px) translateY(-100px);
  background: #10a1ea;
  z-index: 1;
}
.button:before {
  transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  content: attr(title);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  color: #fff;
  z-index: 2;
  text-align: center;
  padding: 20px 40px;
  transform: translateY(200px);
}
.button:hover {
  text-decoration: none;
}
.button:hover:after {
  transform: translateX(-300px) translateY(-100px);
}
.button:hover:before {
  transform: translateY(0);
}

.container {
  display: flex;
  max-width: 80%;
  justify-content: center;
  margin: 0 auto;
}

.card {
  position: relative;
  z-index: 10;
  width: 380px;
  border-radius: 4px;
  padding-bottom: 40px;
  background: #131e32;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 10px;
}
.card figcaption {
  position: absolute;
  bottom: 0;
  padding: 10px;
  color: #fff;
}
.card img {
  max-width: 100%;
  border: 1px solid #222;
  transition: 0.4s;
}
.card:hover img {
  transform: scale(1.1);
}

.yt-card {
  position: absolute;
  bottom: 5%;
  right: 5%;
  text-align: center;
  color: #272243;
  width: 100%;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 0 20px 20px rgba(0, 0, 0, 0.03);
  width: 320px;
  overflow: hidden;
  -webkit-animation: updown 3s ease 6;
  animation: updown 3s ease 6;
}
.yt-card::before {
  content: "";
  border-width: 20px;
  border-color: transparent;
  border-style: solid;
  border-left-color: rgba(255, 255, 255, 0.9);
  border-left-width: 30px;
  display: block;
  position: absolute;
  top: 55%;
  left: 50%;
  z-index: 2;
  transform: translatex(calc(-50% + 15px));
  filter: drop-shadow(5px 5px 4px #000);
  pointer-events: none;
}
.yt-card h1 {
  margin: 0;
  padding: 10px;
  font-size: 16px;
}
.yt-card img {
  max-width: 100%;
  bottom: -14px;
  position: relative;
}
@-webkit-keyframes updown {
  0%,
  50%,
  100% {
    transform: translatey(0);
  }
  20% {
    transform: translatey(5px);
  }
  25% {
    transform: translatey(-20px);
  }
  30% {
    transform: translatey(20px);
  }
  35% {
    transform: translatey(-5px);
  }
}
@keyframes updown {
  0%,
  50%,
  100% {
    transform: translatey(0);
  }
  20% {
    transform: translatey(5px);
  }
  25% {
    transform: translatey(-20px);
  }
  30% {
    transform: translatey(20px);
  }
  35% {
    transform: translatey(-5px);
  }
}