/*------ ベース ------------------------------------ */
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
  color: inherit;
}

/*------ Loading ------------------------------------ */
/* Loading背景画面設定　*/
#splash {
  /*fixedで全面に固定*/
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: 999;
    background:#333;
    text-align:center;
    color:#fff;
  }
  
  /* Loading画像中央配置　*/
  #splash_logo {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  
  /* Loading アイコンの大きさ設定　*/
  #splash_logo img {
    width:500px;
  }

  @media screen and (max-width: 960px){
    #splash_logo img {
      width: 100%;
    }
  
  }
  
  /* fadeUpをするアイコンの動き */
  .fadeUp{
  animation-name: fadeUpAnime;
  animation-duration:0.5s;
  animation-fill-mode:forwards;
  opacity: 0;
  }
  
  @keyframes fadeUpAnime{
    from {
      opacity: 0;
    transform: translateY(100px);
    }
  
    to {
      opacity: 1;
    transform: translateY(0);
    }
  }

/*------ header ------------------------------------ */



.header__pc {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #fff;
  border-bottom: 1px solid #111111;
  width: 100%;
  position: fixed;
  top: -80px;
  left: 0;
  z-index: 1;
  transition: all 0.3s ease-in-out;
  visibility: hidden;
}

.header__pc.is-show {
  top: 0;
  visibility: visible;
}

.header__logo--pc {
  font-size: 24px;
  font-weight: bold;
  padding: 10px 0 0 240px;
}

.nav__list {
  list-style: none;
  display: flex;
  padding: 10px 240px 0 0;
  gap: 50px;
}

.nav__link:hover {
  text-decoration: underline;
}


/* SP メニュー　*/
.header__logo--sp,
.header__sp{
  display: none;
}

@media screen and (max-width: 960px){
  .header__pc{
    display: none;
  }

  .header__sp{
    display: block;
  }

  .header__logo--sp{
    margin: 0 auto;
    font-size: 16px;
    font-weight: bold;
    padding: 10px
  }

/*ハンバーガーボタン*/
.openbtn{
  position: fixed;
    top: 0px;
    right: 5px;
	cursor: pointer;
    width: 50px;
    height:50px;
	border-radius: 5px;
  z-index: 9999;
}



/*ボタン内側*/
.openbtn span{
    display: inline-block;
    transition: all .4s;/*アニメーションの設定*/
    position: absolute;
    left: 14px;
    height: 3px;
    border-radius: 2px;
	background: #111111;
  	width: 45%;
  }

.openbtn span:nth-of-type(1) {
	top:15px;	
}

.openbtn span:nth-of-type(2) {
	top:23px;
}

.openbtn span:nth-of-type(3) {
	top:31px;
}

/*activeクラスが付与されると線が回転して×に*/

.openbtn.active span:nth-of-type(1) {
    top: 18px;
    left: 18px;
    transform: translateY(6px) rotate(-45deg);
    width: 30%;
}

.openbtn.active span:nth-of-type(2) {
	opacity: 0;/*真ん中の線は透過*/
}

.openbtn.active span:nth-of-type(3){
    top: 30px;
    left: 18px;
    transform: translateY(-6px) rotate(45deg);
    width: 30%;
}

/* 黒い背景を画面いっぱいに表示させる */
  .header__nav--sp{
    display: none;
    top: 0;
    position: fixed;
    width: 100%;
    height: 100vh; /* どの媒体で見ても高さを100にする */
    background-color: #4A4A4A;
    opacity: 0.8;
    z-index: 9998; /* mainvisualより表層に表示したいけどハンバーガーメニューよりは下にしたい */
  }
/* header-nav-spを真ん中に表示させる */
  .header__nav--sp ul{
    padding-left: 0;
  display: flex; /*justify-contentなどで中央配置に設定したいので一旦flexにする*/
  flex-direction: column; /* 横並びを縦並びにする */
  justify-content: center;
  align-items: center; /* これだとulのもつ高さにしかならないので */
  height: 100%; /* 親要素であるheader-nav-sp自体の高さの100％とする */
  gap: 20px;
  list-style: none;
  }

  .header__nav--sp li{
    color: #FFFFFF;
    font-size: 36px;
    font-weight: bold;
    text-align: right;
  }
}

/* メインコンテンツ */
main {
  text-align: center;
}

/*------ 共通：タイトル ------------------------------------ */

.topics__title,
.gallery__title,
.about__title,
.skills__title,
.contact__title,
.works__title {
  font-size: 48px;
  margin-bottom: 10px;
  align-items: center;
  text-align: center;
  margin-top: 150px;
}

/*-----各タイトルとその下の日本語装飾の設定詳細---------*/
/* https://chiiweb.net/media/headline/ */
h2 {
	position: relative;
	/*padding-bottom: 10px;*/
	display: inline-block;
  text-align: center;
}
h2 span {
	font-size: 11px;
	background: #ffffff;
	display: inline-block;
	width: fit-content;
	position: absolute;
	left: 0;
	right: 0;
	bottom: -6px;
	padding: 0 10px;
	margin: 4px auto 0;
}
h2::after {
	content: '';
	width: 100%;
	height: 1px;
	background: #000;
	display: block;
	margin: auto;
	position: absolute;
	bottom: 0;
	z-index: -1;
}
/* ここまでCSS参照 */

/*------ intro ------------------------------------ */

/*左と右を囲う全体のエリア*/
.intro{
  position: relative;
  max-width: 1440px;
  padding: 0 40px 0 40px;
  margin: 0 auto;
  display: flex;
}

/*左エリア*/
.intro__title{
  /*左固定記述*/
  position: -webkit-sticky;/*Safari用*/
  position: sticky;
  top:0;
	/*横半分50%　縦を100vhにする*/
	width: 50%;
	height: 100vh;
    display: flex;
    align-items: center;
}

.intro__image{
  width: 70%;
  margin: 0 auto;
}

/*右エリア*/
.intro__description{
	/*横半分50%にする*/
	width:50%;
  margin-left: auto;
}

.intro__message{
  font-size: 16px;
  line-height: 3;
  letter-spacing: 0.1em;
  margin: 0 auto;
  text-align: left;
  padding-left: 100px;

  height: 100vh;
    align-items: center;
    display: flex;
}

.intro__topics{
  padding: 250px 0 250px 100px;
  text-align: left;
  height: 50vh;
}

.intro__topics__list {
  list-style: none;
  letter-spacing: 0.1em;
}

/*＝＝＝＝＝＝＝＝＝＝＝960px以下の見え方＝＝＝＝＝＝＝＝＝＝＝＝＝*/

@media screen and (max-width:960px){
  .intro{
    padding: 20px;
	display: block;/*display:flex;を解除*/
}
.intro__title{
 	position:relative!important;/*position stickyを解除*/
	width:100%;
	height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.intro__description{
	width:100%;
}

.intro__message{
  padding-left: 0;
  margin: 0 auto;
  text-align: center;
}

.intro__topics{
  display: none !important;
  }
}


/*------ gallery（TOPのWorks） ------------------------------------ */
.gallery{
	height: 100%;
  margin-bottom: 40px;
  text-align: center;
}

.gallery__image {
  width:100%;/*スライダー内の画像を横幅100%に*/
  height:auto;
}

/*slickのJSで書かれるタグ内、スライド左右の余白調整*/

.slider .slick-slide {
  margin:0 10px;/*スライド左右の余白調整*/
}

.gallery__production {
  margin-top: 150px;
  margin-bottom: 100px;
  padding-left: 0;
}

@media screen and (max-width: 960px){
  .gallery__production {
    margin-bottom: 0px;
  }
}

.gallery__production--sp{
  display: none;
  margin-bottom: 100px;
  padding-right: 0;
}


@media screen and (max-width: 960px){
  .gallery__production--sp{
    display: block;
  }
}


/*------ About ------------------------------------ */
.about{
  max-width: 1440px;
  padding: 0 40px 0 40px;
  margin: 0 auto;
  margin-bottom: 40px;
  text-align: center;
}

.about__content {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 150px;
  padding-bottom: 150px;
}

@media screen and (max-width: 960px){
  .about{
    padding: 0;
  }
  .about__content {
  display:block;
  }
}

.about__images{
  width: 40%;
}

.about__photo {
  width: 100%;
  height: auto;
  margin-bottom: 20px;
}

@media screen and (max-width: 960px){
  .about__images{
    width: 100%;
  }
  .about__photo {
    width: 100%;
  }
}

.about__word{
  padding: 0 20px;
  width: 60%;
}

@media screen and (max-width: 960px){
  .about__word{
    width: 100%;
    box-sizing: border-box;
  }
}

.about__name{
  font-size:32px;
  text-align: left;
}

.about__ruby{
  font-size: 16px;
  text-align: left;

}

.about_border {
	border-width: 0 0 1px 0;
	border-style: solid;
	border-color: #111111;
  padding: 20px 0;
}

.about__description{
  font-size: 16px;
  text-align: left;
  margin-top: 50px;
}

/*------ skills ------------------------------------ */


.skills{
  max-width: 1440px;
  padding: 0 40px 0 40px;
  margin: 0 auto;
  margin-bottom: 40px;
  text-align: center;
}

.skills__cards {
  display: flex;
  gap: 60px;
  justify-content: center;
}

@media screen and (max-width: 960px){
  .skills{
    box-sizing: border-box;
  }
  .skills__cards {
    flex-direction: column;
    gap: 0;
  }
}

.skills__card {
  background-color: #f1f1f1;
  padding: 50px;
  text-align: center;
  width: 33.33%;
  margin-top: 150px;
  margin-bottom: 150px;
}

@media screen and (max-width: 960px){
  .skills__card {
    width: 100%;
    box-sizing: border-box;
    margin: 0 auto;
    margin-top: 100px;
  }
}

.skills__card__image{
  width: 150px;
  height: auto;
}

.skills__card-title {
  font-size: 30px;
  color: #666666;
  margin-bottom: 50px;
}

.skills__card-description{
  font-size: 20px;
  color: #666666;
  margin-bottom: 50px;
}

.skills__card-tech{
  font-size: 16px;
  color: #f1f1f1;
  background-color: #666666;
  border-radius: 40px;
  padding: 10px 0;
}

/*------ contact ------------------------------------ */
.contact{
  max-width: 1440px;
  padding: 0 40px 0 40px;
  margin: 0 auto;
  margin-bottom: 40px;
  text-align: center;
}

.contact__info{
  margin-top: 50px;
  margin-bottom: 100px;
}

.contact__form {
  max-width: 800px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 50px;
  text-align: left;
}

.form-group__label {
  display: block;
  margin-bottom: 5px;
}

.form-group__input,
.form-group__textarea,
.form-group__select {
  width: 100%;
  padding: 10px;
  margin: 10px 0 50px 0;
  border-width: 0 0 1px 0;
	border-style: solid;
	border-color: #ccc;
  box-sizing: border-box;
}

.form-group__radio,
.form-group__checkbox {
  margin: 30px 5px 50px 0;
}

.form-group__radio-label,
.form-group__checkbox-label {
  margin-right: 50px;
}

.contact__button {
  width: 100%;
  max-width: 426px;
  margin: 0 auto;
  padding: 20px;
  background-color: #111111;
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 5px;
  font-size: 1.5em;
  letter-spacing: 1.5em;
}

/* 必須アイコン */
.form-required {
  margin-left: 2em;
  color: #fff;
  background-color: #f67a7a;
  padding: 2px 8px;
  font-size: 0.9rem;
  border-radius: 3px;
}

/*------ 共通：ボタン ------------------------------------ */
/* 白　矢印あり */
.white__arrow--Button a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  margin: 0 auto;
  padding: 1em 2em;
  width: 300px;
  color: #111111;
  border: 1px solid #111111;
  border-radius: 5px;
  transition: 0.3s;
}

@media screen and (max-width: 960px){
  .white__arrow--Button a {
    width: 30%;
  }
}


.white__arrow--Button a::before {
  content: '';
  position: absolute;
  top: calc(50% - 2px);
  right: 1em;
  transform: translateY(calc(-50% - 1px)) rotate(30deg);
  width: 12px;
  height: 1px;
  background-color: #111111;
  transition: 0.3s;
}

@media screen and (max-width: 660px){
  .white__arrow--Button a::before {
    content: none;
  }
}

.white__arrow--Button a::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 1em;
  transform: translateY(-50%);
  width: 70px;
  height: 1px;
  background-color: #111111;
  transition: 0.3s;
}

@media screen and (max-width: 660px){
  .white__arrow--Button a::after {
    content: none;
  }
}

.white__arrow--Button a:hover {
  color: #ffffff;
  background-color: #111111;
}

.white__arrow--Button a:hover::before,
.white__arrow--Button a:hover::after {
  right: 0.5em;
  background-color: #ffffff;
}

/* 黒　矢印あり */
.black__arrow--Button a {
  display: flex;
  justify-content: space-around;
  align-items: center;
  position: relative;
  margin: 0 auto;
  padding: 1em 5em;
  width: 300px;
  color: #ffffff;
  font-weight: bold;
  background-color: #111111;
  border-radius: 5px;
  transition: 0.3s;
}

@media screen and (max-width: 960px){
  .black__arrow--Button a {
    width: 200px;
  }
}

.black__arrow--Button a::before {
  content: '';
  position: absolute;
  top: calc(50% - 2px);
  left: 3em;
  transform: translateY(calc(50% - 1px)) rotate(-30deg);
  width: 12px;
  height: 1px;
  background-color: #fff;
  transition: 0.3s;
}

.black__arrow--Button a::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 3em;
  transform: translateY(50%);
  width: 70px;
  height: 1px;
  background-color: #fff;
  transition: 0.3s;
}

.black__arrow--Button a:hover {
  color: #111111;
  background-color: #666666;
}

.black__arrow--Button a:hover::before,
.black__arrow--Button a:hover::after {
  left: 0.5em;
  background-color: #111111;
}

.black__arrow--Button{
  margin-bottom: 150px;
}

.works__back--buttom{
  margin-top: 150px;
}

/* modalのBackボタン */
.gallery__modal__close-button a {
  display: flex;
  justify-content: space-around;
  align-items: center;
  position: relative;
  margin: 0 auto;
  padding: 1em 2em;
  width: 300px;
  color: #ffffff;
  background-color: #111111;
  border-radius: 5px;
  transition: 0.3s;
  margin-top: 50px;
}

@media screen and (max-width: 960px){
  .gallery__modal__close-button a {
    width: 200px;
  }
}

.gallery__modal__close-button a::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 30%;
  width: 1px;
  height: 30px;
  transform: translate(-50%,-50%) rotate(45deg);
  background-color: #fff;
  transition: 0.3s;
}

.gallery__modal__close-button a::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 30%;
  width: 1px;
  height: 30px;
  transform: translate(-50%,-50%) rotate(-45deg);
  background-color: #fff;
  transition: 0.3s;
}

.gallery__modal__close-button a:hover {
  color: #111111;
  background-color: #666666;
}

.gallery__modal__close-button a:hover::before,
.gallery__modal__close-button a:hover::after {
  background-color: #111111;
}


/*------ footer ------------------------------------ */

.footer {
  text-align: center;
  padding: 20px 0;
  margin-top: 20px;
  background-color: #111111;
}

.footer__text {
  color: #ffffff;
  margin: 0;
}

/*------ TOPに戻るボタン ------------------------------------ */
/* ページトップ */

.pagetop {
  position: fixed;
  top: 30%;
  right: 5%;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
}

.pagetop::before {
  content: "";
  position: absolute;
  top: 145px;
  bottom: -50px;
  right: 3px;
  width: 1px;
  height: 13px;
  background: #111;
  transform: skewX(-40deg);
}

.pagetop::after {
  content: "";
  position: absolute;
  top: 107px;
  right: 9px;
  /*矢印の形状*/
  width: 1px;
  height: 50px;
  background: #111;
}

/* scroll */

#sidebar {
  position: fixed;
  bottom: 20%;
  right: 5%;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

@media screen and (max-width: 960px){
  #sidebar{
    top: 70%;
  }
}

#sidebar.none {
  opacity: 0;
  transition: 0.3s;
}

.scroll-text {
  position: relative;
  /*transform: translateY(50%);*/
  font-size: 16px;
  /*padding-left: 6px;*/
  /*white-space: nowrap;*/
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.scroll-text::before {
  content: "";
  position: absolute;
  top: 107px;
  bottom: -50px;
  right: 3px;
  width: 1px;
  height: 13px;
  background: #111111;
  transform: skewX(-40deg);
}

.scroll-text::after {
  content: "";
  position: absolute;
  top: 70px;
  right: 9px;
  width: 1px;
  height: 50px;
  background: #111111;
}


/*------ gallery modal ------------------------------------ */
/*モーダル本体の指定 + モーダル外側の背景の指定*/
.gallery__modal01,
.gallery__modal02,
.gallery__modal03,
.gallery__modal04,
.gallery__modal05,
.gallery__modal06,
.gallery__modal07 {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  background: rgba(0,0,0,80%);
  padding: 40px 20px;
  overflow: auto;
  opacity: 0;
  visibility: hidden;
  transition: .3s;
  box-sizing: border-box;
}
/*モーダル本体の擬似要素の指定*/
.gallery__modal01:before,
.gallery__modal02:before,
.gallery__modal03:before,
.gallery__modal04:before,
.gallery__modal05:before,
.gallery__modal06:before,
.gallery__modal07:before{
  content: "";
  display: inline-block;
  vertical-align: middle;
  height: 100%;
}
/*モーダル本体に「active」クラス付与した時のスタイル*/
.gallery__modal01.active,
.gallery__modal02.active,
.gallery__modal03.active,
.gallery__modal04.active,
.gallery__modal05.active,
.gallery__modal06.active,
.gallery__modal07.active{
  opacity: 1;
  visibility: visible;
}
/*モーダル枠の指定*/
.gallery__modal-container{
  position: relative;
  display: inline-block;
  vertical-align: middle;
  max-width: 1440px;
  width: 90%;
}
/*モーダルを閉じるボタンの指定*/
.gallery__modal-close{
  position: sticky;
  display: flex;
  align-items: center;
  justify-content: center;
  top: 50px;
  left: calc(100vw - 3em);
  width: 40px;
  height: 40px;
  font-size: 40px;
  color: #111111;
  cursor: pointer;
}
/*モーダル内のコンテンツの指定*/
.gallery__modal-content{
  background: #f1f1f1;
  text-align: center;
  padding: 5%;
}

.gallery__modal__images{
  width: 100%;
  height: auto;
  margin-bottom: 50px;
}

.description-title{
  padding: 0px 10%;
  margin-bottom: 50px;
  text-align: left;
}

.description-text{
  padding: 0px 10%;
  text-align: left;
  margin-bottom: 50px;
}

.gallery__modal__view-site{  
  display: block;
  margin: 0 auto;
  padding: 10px 30%;
  border: 1px solid #111111;
  background-color: #ffffff;
  color: #111111;
  text-align: center;
  margin-top: 50px;
  margin-bottom: 100px;
}

@media screen and (max-width:767px) {
  .gallery__modal-content{
    padding: 100px 20px 20px 20px;
  }
  .description-title,
  .description-text{
    padding: 0 20px;
  }

}

/*---thanksページ-----------------------------------------*/

.section-thanks{
  padding: 100px 40px;
}
.thanks_h1{
  font-size: 2.8rem;
  text-align: center;
}
.thanks_a{
  background-color:#111111;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 5px;
  margin-top: 100px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.8rem;
  width: 12em;
  height: 3em;
}



/*---Worksページ-----------------------------------------*/
.works {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 50px;
}
/*---カテゴリわけ------*/
.works__tabs {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 40px;
}

@media screen and (max-width: 960px){
  .works__tabs {
    display: block;
    gap: 50px;
    margin: 100px 0;
  }
}

.works__tab-button {
  background-color: #f0f0f0;
  cursor: pointer;
  border: none;
  padding: 10px 40px;
}

@media screen and (max-width: 960px){
  .works__tab-button {
    margin-bottom: 20px;
  }
}

.works__tab-button.active{
  background-color: #111111;
  color: #fff;
}

.works__tab-button:hover {
  background-color: #111111;
  color: #fff;
}
/*---実績部分--------------------------*/
.works__tab-content {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 100px;
  padding-top: 150px;
  padding-bottom: 150px;
  border-bottom: 1px solid #111111;
  /*transition: opacity 0.5s ease-in-out; /* 0.5秒でフェードイン/アウト */
}


.works__tab-content.show {
  opacity: 1;
  display: flex;
}

@media screen and (max-width: 960px){
  .works__tab-content.show {
    flex-direction: column;
  }
}

.works__tab-content.active {
  display: block;
}


.works__image--sp{
  display: none;
}

@media screen and (max-width: 960px){
  .works__image--sp{
    display: block;
    margin: 0 auto;
    padding-bottom: 30px;
  }
  .works__image--sp img{
    width: 100%;
  }
}

.works-item {
  width: 80%;
}

.works-item__category {
  width: 30%;
  padding: 5px 0;
  background-color: #111111;
  color: #ffffff;
  margin-bottom: 100px;
}

@media screen and (max-width: 960px){
  .works-item__category {
    width: 50%;
  }
}


.works-item__title {
  font-size: 30px;
  margin-bottom: 30px;
  text-align: left;
}

.works-item__description {
  text-align: left;
  margin-bottom: 100px;
}

.works-item__image img {
  width: 100%;
  height: auto;
}

@media screen and (max-width: 960px){
  .works-item__image {
    display: none;
  }
}




/*---Works　詳細ページ-----------------------------------------*/
.project{
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 50px;
}

.project__info {
  text-align: left;
  padding: 50px 0;
}

.project__title {
  font-size: 1.8em;
  margin-bottom: 10px;
}

.project__image img{
  width: 100%;
}

.project__description {
  padding: 50px 0;
  display: flex;
  align-items: center;
  gap: 10%;
  text-align: left;
  line-height: 1.8;
}

@media screen and (max-width: 960px){
  .project__description {
    display: block;
    padding-bottom: 50px;
  }
  .project__description .white__arrow--Button{
    padding: 50px 0;
  }
}

.project__description dl {
  display: flex;
  flex-wrap: wrap;
  width: 60%;
}

.project__description dt {
  width: 20%;
  margin-bottom: 10px;
}

.project__description dd {
  width: 60%;
  margin-bottom: 10px;
}

@media screen and (max-width: 960px){
  .btn--pc{
    display: none;
  }
}

.project__concept{
  text-align: left;
  padding-bottom: 50px;
}

.btn--sp{
  display: none;
  padding: 50px 0;
}

@media screen and (max-width: 960px){
  .btn--sp{
    display: block;
  }
}

.project__sites{
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 5%;
  padding: 50px 0 150px 0;
}

.project__sites-images{
  display: flex;
  gap: 5%;
  padding: 50px 0 150px 0;
}

.project__sites-image{
  width: 100%;
}

.project__sites-image-PC{
  width: 75%;
}

.project__sites-image-SP{
  width: 20%;
}

.back-button {
  display: block;
  margin: 0 auto;
  padding: 10px 30%;
  border: 1px solid #111111;
  background-color: #ffffff;
  color: #111111;
  text-align: center;
  margin-top: 50px;
  margin-bottom: 150px;
  transition: color 0.3s;
}

.back-button:hover {
  background-color: #111111;
  color: #ffffff;
}
.scroll, .pagetop {
  opacity: 0;
  transition: opacity 0.3s ease-in-out; /* ふわっと表示するためのtransition */
}