@charset "utf-8";

/*--------------------------*/
img{
    width: 100%;
    display: block;
    line-height: 0;
    font-size: 0;
}

@charset "UTF-8";
.sp-only-block {
  display: none;
}
@media screen and (max-width: 768px) {
  .sp-only-block {
    display: block;
  }
}

.pc-only-block {
  display: block;
}
@media screen and (max-width: 768px) {
  .pc-only-block {
    display: none;
  }
}



.tsukuba-open {
  max-width: 100%;
  margin: 0 auto;
  padding: 0;
  overflow: hidden;
}
.tsukuba-open img {
  width: 100%;
  height: auto;
}
.tsukuba-open section.fv {
    background-color: #FFF133;
  position: relative;
    padding: 40px 0 4rem 0px;
}

.tsukuba-open section.fv img{
    display: block;
    width: 94.93%;
    margin-left: auto;
    margin-right: auto;
}


.tsukuba-open section.fv .menu{
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    background-color: #174F9E;
    width: 68.75%;
    padding: 1% 2% 1% 2%;
    height: auto;
     border-radius: 1rem 1rem 0 0;
}

.tsukuba-open section.fv .menu{
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tsukuba-open section.fv .menu li{
    color: white;
    margin: 0 1%;
}

.tsukuba-open section.fv .menu li img{
    width: 90%;
}

.tsukuba-open section.event {
    background-image:url(../img/bg_event.jpg);
    background-size: cover;
    padding: 4rem 0 4rem 0;
}

.tsukuba-open section.event h2 {
    width: 53.46%;
    margin: auto auto 2rem auto;
}

.tsukuba-open section.event .lead {
    width: 70.2%;
    margin: auto auto 2rem auto;
}

.tsukuba-open section.event .flexbox ul {
    width: 100%;
    margin: auto;
}

.tsukuba-open section.event .flexbox ul li{
    display: block;
    width: 80%;
    margin-bottom: 1.2rem;
    margin-left: auto;
    margin-right: auto;
}

.tsukuba-open section.event .flexbox ul li img{
    width: 100%;
}

.tsukuba-open section.floor3{
    background-color: #FFF133;
    padding: 4rem 0 4rem 0;
}

.tsukuba-open section.floor3 h2 {
    width: 92.26%;
    margin: auto auto 3rem auto;
}


@keyframes infinity-scroll-left {
from {
  transform: translateX(0);
}
  to {
  transform: translateX(-100%);
}
}
.scroll-infinity__wrap {
  display: flex;
  overflow: hidden;
  margin-bottom: 4rem;
}
.scroll-infinity__list {
  display: flex;
  list-style: none;
  padding: 0
}
.scroll-infinity__list--left {
  animation: infinity-scroll-left 80s infinite linear 0.5s both;
}
.scroll-infinity__item {
  width: calc(100vw / 1);
  margin: auto 0.5rem auto 0.5rem;
}
.scroll-infinity__item>img {
  width: 100%;
}

.tsukuba-open section.floor3 .btn {
    width: 90%;
    margin: auto;
}

.tsukuba-open section.floor3 .btn img{
    transition: opacity .3s ease;
}

.tsukuba-open section.floor3 .btn img:hover{
    opacity: .8;
}

.tsukuba-open section.floor2{
    background-color: #FFF133;
    padding: 4rem 0 4rem 0;
}

.tsukuba-open section.floor2 h2 {
    width: 84.13%;
    margin: auto auto 3rem auto;
}


	@keyframes infinity-scroll-right {
from {
  transform: translateX(-100%);
}
  to {
  transform: translateX(0%);
}
}
.scroll-infinity__wrap {
  display: flex;
  overflow: hidden;
  margin-bottom: 4rem;
}
.scroll-infinity__list {
  display: flex;
  list-style: none;
  padding: 0
}

	.scroll-infinity__list--right{
  animation :infinity-scroll-right 80s infinite linear 0.5s both;
}

.scroll-infinity__item {
  width: calc(100vw / 3);
  margin: auto 1rem auto 1rem;
}
.scroll-infinity__item>img {
  width: 100%;
}

.tsukuba-open section.floor2 .btn {
    width: 90%;
    margin: auto;
}

.tsukuba-open section.floor2 .btn img{
    transition: opacity .3s ease;
}

.tsukuba-open section.floor2 .btn img:hover{
    opacity: .8;
}



.tsukuba-open section.flolrgide {
    background-color: #FFFEF4;
    padding: 4rem 0 4rem 0;
}

.tsukuba-open section.flolrgide h2 {
    width: 52.13%;
    margin: auto auto 2rem auto;
}

.tsukuba-open section.flolrgide .lead {
    text-align: center;
    font-size: 1.5rem;
    line-height: 2;
    margin-bottom: 2rem;
}

.tsukuba-open section.flolrgide .flexbox ul {
    width: 64.81%;
    margin: auto;
}

.tsukuba-open section.flolrgide .flexbox ul li{
    display: block;
    width: 100%;
    margin-bottom: 2rem;
    margin-left: 4.2%;
    transition: opacity .3s ease;

}

.tsukuba-open section.flolrgide .flexbox ul li img{
    width: 100%;
    transition: opacity .3s ease;
}

.tsukuba-open section.flolrgide .flexbox ul li img:hover{
    opacity: .8;
}



.tsukuba-open section.accses {
    background-color: #FFF133;
    padding: 4rem 0 4rem 0;
    font-size: 1.3rem;
    line-height: 2;
}

.tsukuba-open section.accses h2 {
    width: 39.46%;
    margin: auto auto 2rem auto;
}


.tsukuba-open section.accses .iframe-wrapper {
  width: 90%;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 3rem;
}

.tsukuba-open section.accses .iframe-wrapper iframe {
  width: 100%;
}



.tsukuba-open section.accses .title_m {
    width: 90%;
    color: #174F9E;
    margin: auto;
    margin-top: 2rem;
}


.tsukuba-open section.accses .flexbox {
    display: flex;
    justify-content: space-between;
    width: 90%;
    margin: auto;
}

.tsukuba-open section.accses .flexbox .left {
   width: 65%;
   text-align: left;
}

.tsukuba-open section.accses .flexbox .right {
   width: 25%;
   text-align: right;
}




.backtotop {
	position: fixed;
	right: 15px;
	bottom: 20px;
	z-index: 9000;
	display: none;
}
.closewin {
	position: fixed;
    left: 15px;
	bottom: 20px;
	z-index: 9000;
	display: none;
}
.backtotop a,.closewin a{
	display: block;
	padding: 0;
    opacity: 1;
    width: 80px;
    height: 80px;
	margin: 0;
	background:none;
 	border-radius: 5px;
	text-decoration: none;
	font-weight: bold;
	font-size: 12px;
}

.backtotop a img,.closewin a img{
    width: 100%;
}

.backtotop a:hover,.closewin a:hover{background: none;}


.backbtn{
	margin: 10px auto 10px auto;
}


.header {
  position: fixed;
  width: 100%;
  margin: auto;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  position: relative;
}

/* ハンバーガーボタンのデザイン */
.drawer__button {
  position: absolute;
    background-image: url("../img/menu.png");
    background-size: cover;
  right: 1rem;
  top:1rem;
  width: 4rem;
  height:4rem;
  background-color: transparent;
  border: none;
  cursor: pointer;
  z-index: 9999; /* メニューを開いている時もクリックできるよう設定 */
}

.drawer__button > span:first-child {
  transform: translate(-50%, calc(-50% - 0.5rem));
  transition: transform 0.3s ease;
}
.drawer__button > span:nth-child(2) {
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease;
}
.drawer__button > span:last-child {
  transform: translate(-50%, calc(-50% + 0.5rem));
  transition: transform 0.3s ease;
}
/* 展開時のデザイン */
.drawer__button.active > span:first-child {
  transform: translate(-50%, -50%) rotate(-45deg);
}
.drawer__button.active > span:nth-child(2) {
  opacity: 0;
}
.drawer__button.active > span:last-child {
  transform: translate(-50%, -50%) rotate(45deg);
}
/* メニューのデザイン */
.drawer__nav {
  position: fixed; /* 追従ヘッダーなどでも表示できるよう設定しておく */
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  transition: opacity 0.3s ease;
  opacity: 0;
  visibility: hidden;
}
.drawer__nav.active {
  opacity: 1;
  visibility: visible;
}
.drawer__nav__inner {
  position: relative;
  width: 100%;
  height:  100%;
  background:#174F9E;
  color: white;
  padding: 4rem 1.5rem 1rem;
  margin: 0 0 0 auto;
  overflow: scroll;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}


.drawer__nav.active .drawer__nav__inner {
  transform: translateX(0);
}
.drawer__nav__menu {
  list-style: none;
  padding-left: 0;
  display: inherit;
  align-items: flex-end;
  width: 100%;
  margin: auto;
}

@media screen and (max-width: 640px) {
.drawer__nav__menu {
  list-style: none;
  padding-left: 0;
  display: inherit;
  align-items: flex-end;
  width: 100%;
  margin: auto;
  text-align: center;
}
}
.drawer__nav__link {
  display: block;
  color:white;
  text-decoration: none;
  margin: 1rem;
  
}

@media screen and (max-width:768px) {
.drawer__nav__link {
  width: 90%;
  font-size: 2.4rem;
  line-height: 3;
  border-bottom: 1px solid white;
  display: block;
  text-decoration: none;
  margin: auto;
  margin-bottom: 1rem;
  margin-left: 1%;
  
}
}

.drawer__nav__link img{
  width: 100%;
}

/* ハンバーガーメニュー展開時、背景を固定 */
body.active {
  height: 100%;
  overflow: hidden;
}

/* 見た目の調整 */
section {
  width: 100%;
}
section:nth-child(even) {
  background-color: skyblue;
}


.drawer__button.active {
    transform: rotate(0deg);
    transition: all ease 600ms;
}


.drawer__button.active {
  transform: rotate(90deg);
  
}