* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Noto Sans JP", serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
}

body {
  position: relative;
  background-color: #f4f4f4;
  color: #707070;
}

header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
}

/* ロゴ */
.logo img {
  height: 50px;
}

/* ハンバーガーメニュー */
.menu {
  cursor: pointer;
}

.hamburger {
  width: 30px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: #fff;
  transition: all 0.3s ease-in-out;
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 250px;
  height: 100vh;
  background: rgba(0, 0, 0, 0.9);
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: right 0.3s ease-in-out;
}

.mobile-menu ul {
  list-style: none;
  padding: 0;
}

.mobile-menu ul li {
  margin: 15px 0;
}

.mobile-menu ul li a {
  color: #fff;
  text-decoration: none;
  font-size: 20px;
}

.mobile-menu.open {
  right: 0;
}

.close-button {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 24px;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
}

.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.background-video {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
}

.hero .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: white;
  padding: 20px;
}

.hero h2 {
  font-size: 4rem;
  font-weight: bold;
  margin-bottom: 10px;
}

.hero h3 {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 20px;
}

.event-info {
  display: block;
  padding: 20px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.event-info h2 {
  text-align: left;
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: #707070;
}

.event-list {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.event-item {
  padding: 10px;
  border-radius: 10px;
  text-align: center;
  width: 350px;
}

.event-item img {
  width: 100%;
  border-radius: 10px;
}

.event-item p {
  margin-top: 10px;
  font-size: 1rem;
  color: #707070;
}

.more-btn {
  display: inline-block;
  margin-top: 20px;
  text-decoration: none;
  color: #5DC1CF;
  font-size: 1.5rem;
  font-weight: bold;
}

.about {
  background: #f8f8f8;
  text-align: center;
  padding: 80px 20px 40px;
  font-size: 1.2rem;
  line-height: 1.8;
}

.about_title{
  position: relative;
  font-size: 32px;
  font-weight: bold;
  color: #A1A1A1;
}

.about_title::after{
  content: "";
  position: absolute;
  left: 50%;
  bottom: -50px;
  width: 200px;
  height: 20px;
  background-color: #5DC1CF;
  transform: translateX(-50%);
}

.about_inner{
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 50px;
  font-size: 2.5rem;
  font-weight: bold;
  color: #5DC1CF;
}

.purpose{
  width: 100%;
  display: block;
}

.purpose01{
  background-image: url(../img/purpose01.png);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  color: #fff;
}

.purpose02{
  background-image: url(../img/purpose02.png);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  color: #fff;
}

.purpose03{
  background-image: url(../img/purpose03.png);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  color: #fff;
}

.purpose-title{
  padding-left: 120px;
}

.purpose-title h3{
  font-size: 64px;
  font-weight: 900;
  text-shadow: 4px 4px 4px rgba(119, 119, 119, 0.5);
}

.purpose-title p{
  font-size: 32px;
  text-shadow: 4px 4px 4px rgba(119, 119, 119, 0.5);
}

.purpose-contents{
  margin-top: 80px;
  margin-bottom: 120px;
}

.purpose-contents h2{
  position: relative;
  font-size: 3.5rem;
  font-weight: bold;
  color: #5DC1CF;
  text-align: center;
  margin-bottom: 120px;
}

.purpose-contents h2::after{
  content: "";
  position: absolute;
  left: 50%;
  bottom: -50px;
  width: 200px;
  height: 20px;
  background-color: #5DC1CF;
  transform: translateX(-50%);
}

.purpose-contents p{
  font-size: 2rem;
  font-weight: bold;
  color: #707070;
  text-align: center;
  margin-bottom: 28px;
}

.purpose-contents span{
  font-size: 2.5rem;
  font-weight: bold;
  color: #5DC1CF;
  padding-left: 12px;
  padding-right: 12px;
}

/* Our Activities */
.active{
  display: block;
  width: 90%;
  margin: 180px auto 80px;
  padding: 92px 24px 64px;
  background-color: #fff;
  border-radius: 20px;
  box-shadow: 10px 10px 20px rgba(119, 119, 119, 0.2);
}

.active h2{
  position: relative;
  font-size: 3.5rem;
  font-weight: bold;
  text-align: center;
  margin-bottom: 120px;
}

.active h2::after{
  content: "";
  position: absolute;
  left: 50%;
  bottom: -50px;
  width: 200px;
  height: 20px;
  background-color: #5DC1CF;
  transform: translateX(-50%);
}

.active ul{
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 30px 20px;
}

.active ul li{
  list-style-type: none;
}

.active ul li h4{
  font-size: 1.5rem;
  font-weight: bold;
  text-align: center;
}

.active ul li div{
  font-size: 1.2rem;
  font-weight: bold;
  text-align: center;
  margin-top: 10px;
}

.active ul li img{
  display: block;
  margin: 20px auto;
}

.active ul li p{
  display: block;
  padding: 18px 36px;
}

.member{
  width: 100%;
  margin:200px auto 80px;
  padding-top: 50px;
  background-image: url(../img/member-bg.png);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.member h2{
  position: relative;
  font-size: 3.5rem;
  font-weight: bold;
  text-align: center;
  margin-bottom: 120px;
}

.member h2::after{
  content: "";
  position: absolute;
  left: 50%;
  bottom: -50px;
  width: 200px;
  height: 20px;
  background-color: #5DC1CF;
  transform: translateX(-50%);
}

.member-inner{
  display: flex;
  justify-content: center;
  gap: 30px;
}

.member-box p{
  margin-top: 20px;
  font-size: 1.5rem;
  font-weight: bold;
  text-align: center;
}

.member-box span{
  font-weight: bold;
  color: #5DC1CF;
}

.member-btn{
  display: block;
  width: fit-content;
  margin: 50px auto;
  padding: 12px 48px;
  border-radius: 30px;
  color: #fff;
  background-color: #5DC1CF;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: bold;
}

.contact{
  width: 100%;
  height: 800px;
  background-image: url(../img/contact-bg.png);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.contact-contents{
  display: block;
  width: 80%;
  margin: 0 auto;
}

.contact h2{
  display: inline-block;
  position: relative;
  font-size: 3.5rem;
  font-weight: bold;
  margin-top: 100px;
  margin-bottom: 120px;
}

.contact h2::after{
  content: "";
  position: absolute;
  left: 0;
  bottom:-28px;
  width: 100%;
  height: 20px;
  background-color: #5DC1CF;
}

.contact-inner{
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 300px;
}

.contact-inner p{
  font-size: 28px;
  font-weight: bold;
  line-height: 1.8;
  color: #5DC1CF;
}

.contact-btn{
  display: block;
  width: fit-content;
  margin: 50px auto;
  padding: 24px 48px;
  border-radius: 50px;
  color: #fff;
  background-color: #5DC1CF;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: bold;
}

.news{
  padding-top: 150px;
}

.news-title{
  text-align: center;
}

.news-title h2{
  position: relative;
  font-size: 3.5rem;
  font-weight: bold;
}

.news-title h2::after{
  content: "";
  position: absolute;
  left: 50%;
  bottom: -20px;
  width: 200px;
  height: 20px;
  background-color: #5DC1CF;
  transform: translateX(-50%);
}

.news-title p{
  font-size: 1.2rem;
  font-weight: bold;
  padding-top: 30px;
}

.news-list{
  display: flex;
  gap: 30px;
  justify-content: center;
  align-items: center;
  margin-top: 40px;
}

.news-date{
  padding-top: 16px;
  padding-bottom: 8px;
}

.news-btn{
  display: block;
  width: fit-content;
  margin: 50px auto;
  padding: 24px 48px;
  border-radius: 50px;
  color: #fff;
  background-color: #5DC1CF;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: bold;
}

.sns{
  background-color: #5DC1CF;
}

.sns h2{
  position: relative;
  font-size: 3.5rem;
  font-weight: bold;
  color: #fff;
  text-align: center;
  padding-top: 80px;
  padding-bottom: 80px;
}

.sns-inner{
  display: flex;
  gap: 52px;
  justify-content: center;
  align-items: center;
  padding-bottom: 100px;
}

.sns-inner img{
  width: 100px;
}

footer{
  height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
}

footer img{
  padding-top: 100px;
  width: 120px;
}

.footer-caption{
  text-align: center;
}

.pc{
  display: block;
}

.sp{
  display: none;
}

@media (max-width: 768px){
  .event-info{
    position: static;
    transform: translateX(0);
    width: 100%;
  }

  .about{
    padding-top: 80px;
  }

  .about_title{
    font-size: 28px;
  }

  .about_inner{
    display: block;
  }

  .purpose01{
    background-image: url(../img/purpose-sp01.png);
    align-items: flex-start;
  }

  .purpose02{
    background-image: url(../img/purpose-sp02.png);
    align-items: flex-start;
  }

  .purpose03{
    background-image: url(../img/purpose-sp03.png);
    align-items: flex-start;
  }

.purpose-title{
  padding-top: 20px;
  padding-left: 20px;
}

.active{
  width: 95%;
  margin-top: 50px;
  margin-bottom: 0;
  padding-bottom: 30px;
}

.active ul{
  display: block;
}

.active ul li{
  display: block;
  margin-bottom: 50px;
}

.active ul li img{
  margin-bottom: 0;
}

.active ul li p{
  padding-top: 0;
  line-height: 1.8;
}

.active-line{
  border-top: 1px solid #333 ;
  border-bottom: 1px solid #333;
  padding-top: 40px;
  padding-bottom: 30px;
}

.member{
  margin-top: 80px;
}

.member-inner{
  display: block;
  text-align: center;
}

.member-box p{
  margin-top: 8px;
  margin-bottom: 30px;
}

.contact{
  background-image: url(../img/contact-spbg.png);
}

.contact h2{
  font-size: 3rem;
}

.contact-inner p{
  font-size: 18px;
}

.contact-contents{
  text-align: center;
}

.contact-inner{
  display: block;
}

.contact-btn{
  font-size: 1.2rem;
  margin: 30px auto;
}

.news{
  padding-top: 80px;
}

.news-list{
  display: block;
  width: 80%;
  margin: 0 auto;
}

.news-item{
  margin: 30px auto;
}

.news-date{
  padding-top: 8px;
}

.pc{
  display: none;
}

  .sp{
    display: block;
  }
}