@charset "utf-8";

html {
  font-size: 62.5%;
}
body {
  background-color: #fff;
  color: #000;
  font-family: 'Noto Sans JP',"ヒラギノ角ゴ ProN", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "メイリオ", Meiryo, "游ゴシック Medium", "游ゴシック体", "Yu Gothic Medium", YuGothic, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
  font-size: 1.8em;
  font-weight: 500;
  line-height: 2;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}
a {
  color: #369;
}

.break-word {
  overflow-wrap: break-word;
}
.font-bold {
  font-weight: 700;
}
.font-red {
  color: #f00;
  font-weight: bold;
}
.small {
  font-size: 1.2rem;
  line-height: 1.5;
}
.text-sp {
  text-align: center;
}

.border {
  border: 1px solid #ccc;
}

.hover:hover {
  opacity: .8!important;
  transition: .3s;  
}

ul li {
  margin-left: 2.5rem;
}

@media (max-width: 577px) {
  body {
    font-size: 1.4em;
  }
  ul li {
    margin-left: 2rem;
  }
  .small {
    font-size: 1rem;
  }
  .text-sp {
    text-align: left;
  }
}

/*--------------------
      見出し
--------------------*/

.headline-en {
  font-size: 1.5rem;
  margin-bottom: 4rem;
  text-align: center;
  line-height: 1.4;
}
.headline-en span {
  font-size: 5rem;
  font-weight: 700;
  background: linear-gradient(180deg, #017586, #01396e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
#top_timetable .headline-en,
#top_overview .headline-en {
  color: #fff;
}
#top_timetable .headline-en span,
#top_overview .headline-en span {
  background: linear-gradient(180deg, #fff, #beecfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.headline-bar {
  padding: 0.5rem 0;
  margin-bottom: 3rem;
  background-image: linear-gradient(90deg, #017586 0 80px, #ddd 80px);
  background-repeat: no-repeat;
  background-size: 100% 3px;
  background-position: bottom;
  font-size: 2.6rem;
}
.headline-bar span {
  margin-left: 1rem;
}

.headline-small {
  margin-bottom: 2rem;
  font-size: 2.8rem;
  text-align: center;
  font-weight: 700;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .headline-en {
    font-size: 1.4rem;
  }
  .headline-en span {
    font-size: 5.2rem;
  }
  .headline-small {
    font-size: 2.6rem;
  }
}

@media (max-width: 577px) {
  .headline-en {
    font-size: 1.2rem;
    margin-bottom: 3rem;
  }
  .headline-en span {
    font-size: 3.6rem;
  }
  .headline-bar {
    margin-bottom: 2rem;
    font-size: 2rem;
  }
  .headline-small {
    font-size: 2.2rem;
  }
}

/*--------------------
        ボタン
--------------------*/

a.btn-app,
a.btn-width-s {
  color: #fff! important;
}

.btn-app {
  background: linear-gradient(170deg, #f86f64, #fd317c);
}
.btn-app:hover {
  filter: brightness(1.2);
  box-shadow: none;
  transform: translateY(3px);
}

.btn-width {
  max-width: 480px;
  position: relative;
  display: block;
  padding: 2.5rem 1rem; 
  border-radius: 10px;
  margin: auto;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  font-size: 2.4rem;
  font-weight: 600;
  box-shadow: 5px 5px 15px 0px rgba(0, 0, 0, 0.4);
  transition: all 0.2s;
}
.btn-width:hover {
  box-shadow: none;
  transform: translateY(3px);
}

.btn-width-s {
  max-width: 300px;
  position: relative;
  display: block;
  padding: 1.5rem 1rem; 
  border-radius: 8px;
  margin: auto;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  font-size: 1.8rem;
  font-weight: 600;
  background: linear-gradient(170deg, #017586, #01396e);
}

/* arrow */

.arrow-r-white::after {
  content: '';
  border: 0;
  border-top: solid 3px #fff;
  border-right: solid 3px #fff;
  display: inline-block;
  width: 7px;
  height: 7px;
  position: absolute;
  top: 50%;
  right: 22px;
  transform: translateY(-45%) rotate(45deg);
}

@media (max-width: 577px) {
  .btn-width,
  .btn-width-s {
    max-width: 85%;
    padding: 1.8rem 1rem; 
    font-size: 1.7rem;
    border-radius: 8px;
  }
  .arrow-r-white::after,{
    right: 18px;
  }
}

@media (max-width: 480px) {
  .btn-width,
  .btn-width-s {
    max-width: 90%;
    font-size: 1.5rem;
  }
}

/*--------------------
      トップページ
--------------------*/

/* トップ */

#top {
  padding: 1.5rem 0 5rem;
  text-align: center;
  width: 100%;
  position: relative;
  z-index: 0;
  color: #fff;
  background-color: #00243e;
}

#top .container {
  max-width: 1350px;
}

#top .row {
  display: flex;
  align-items: center;
}

#top video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  filter: drop-shadow(0px 0px rgba(0,0,0,0));
  outline: none;
  border: none;
}

.title {
  position: relative;
  text-align: center;
}

.fade-slider {
  position: relative;
  width: 100%;
  max-width: 520px;
  aspect-ratio: 1 / .9;
  margin: 0 auto;
  overflow: hidden;
}
.fade-slider img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity .8s ease-in-out;
}
.fade-slider img.active {
  opacity: 1;
}
#lead {
  padding: 4rem 0;
  background: url(../images/back.jpg?v=1781685935);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: left;
  font-size: 1.8rem;
}

#top_news {
  font-size: 1.5rem;
}
#top_news span {
  font-size: 1.6rem;
  font-weight: 700;
}
#top_news p {
  margin-bottom: 1rem;
}

@media (max-width: 991px) {
  #top {
    padding: 4rem 0 5rem;
  }
  img.title-txt {
    width: 90%;
  }
}

@media (max-width: 768px) {
  #top {
    padding: 3rem 0 4rem;
  }
  .fade-slider  {
    width: 70%;
  }
  img.title-txt {
    width: 80%;
  }
}

@media (max-width: 577px) {
  img.title-txt {
    width: 100%;
  }
  #lead {
    padding: 3rem 0;
    font-size: 1.5rem;
  }
  #top_news {
    font-size: 1.3rem;
  }
  #top_news span {
    font-size: 1.4rem;
  }
  .news p {
    padding: 1rem;
  }
}

/* タイムテーブル */

#top_timetable {
  padding: 5rem 0 6rem;
  background: linear-gradient(120deg, #017586, #01396e);
  color: #fff;
}
#top_timetable table {
  color: #000;
  line-height: 1.7;
  width: 100%;
  margin-bottom: 4rem;
}

#top_timetable table a {
  font-weight: 700;
}
#top_timetable table a:hover {
  opacity: .7;
  transition: .3s;
}

#top_timetable th,
#top_timetable td {
  border: 1px solid #ccc;
  vertical-align: top;
}

#top_timetable th {
  width: 8%!important;
  padding: 8px 15px;
  background-color: #E1E6EC;
  text-align: center;
  font-size: 90%;
}
#top_timetable th span {
  font-weight: 200;
}

#top_timetable td {
  width: 46%!important;
  padding: 15px 20px;
  background-color: #fff;
}
#top_timetable td img {
  width: 30%;
  max-width: 150px;
}

#top_timetable .max {
  padding: 15px;
  background-color: #fdf6db;
}

#top_timetable td.closed {
  background-color: #E1E6EC;
  color: #999;
  text-align: center;
  vertical-align: middle;
}

#top_timetable .badge {
  padding: 3px 6px;
  border-radius: 3px;
  font-size: 1.2rem;
  font-weight: 600;
}

#top_timetable .badge.badge-warning,
#top_timetable .badge.badge-danger {
  margin-right: 0!important;
  padding: 1px 5px;
  border: 1px solid #f33;
  border-radius: 0;
  background-color: #fff!important;
  color: #f33;
  font-size: 14px;
  font-weight: 700;
}

#top_timetable .session_no {
  padding: 2px 5px;
  background-color: #000;
  color: #fff;
  font-size: 1.4rem;
}

#top_timetable .author {
  margin-top: 1rem;
  margin-bottom: 1rem;
  color: #000;
  font-size: 1.4rem;
  line-height: 1.6;
}

@media (max-width: 991px) {
  #top_timetable table {
    display: block;
    width: 100%;
    /*overflow-x: scroll! important;*/
  }
  #top_timetable td,
  #top_timetable th {
    padding: 10px;
  }
  #top_timetable .badge {
    font-size: 10px;
  }
  #top_timetable .badge.badge-warning,
  #top_timetable .badge.badge-danger {
    font-size: 12px;
  }
  #top_timetable .session_no {
    font-size: 12px;
  }
}

@media (max-width: 577px) {
  #top_timetable {
    padding: 4rem 0 5rem;
  }
  #top_timetable td {
    font-size: 1.3rem;
  }
  #top_timetable .author {
    font-size: 1.1rem;
  }
  #top_timetable .badge {
    padding: 2px 5px;
    border-radius: 2px;
    font-size: .9rem;
  }
    #top_timetable td img {
    width: 48%;
    max-width: 150px;
  }
}

/* スピーカー */

#top_speakers {
  padding: 5rem 0 6rem;
  background: url(../images/back.jpg?v=1781685935);
  background-size: 100% auto;
  background-repeat: no-repeat;
  background-position: top;
}

#top_speakers .speaker-name {
  text-align: center;
  line-height: 1.5;
  font-size: 1.5rem;
}

@media (max-width: 577px) {
  #top_speakers {
    padding: 4rem 0;
  }
  #top_speakers {
    background-size: auto;
  }
}

/* 開催概要 */

#top_overview {
  padding: 5rem 0 6rem;
  background-color: #00243e;
  color: #fff;
}

#top_overview a {
  color: #fff;
}

#top_overview table {
  max-width: 800px;
  margin: 4rem auto 5rem;
  line-height: 1.7;
}
#top_overview tr {
  border-top: 1px solid #fff;  
  border-bottom: 1px solid #fff;
}

#top_overview th,
#top_overview td {
  padding: 1.8rem 0;
}
#top_overview th {
  width: 150px;
  color: #beecfa;
}

.overview-txt p {
  margin-bottom: 1rem;
  font-size: 1.6rem;
}

@media (max-width: 991px) {
  #top_overview table {
    width: 100%;
  } 
  #top_overview th {
  width: 75px;
  }
  .overview-txt p {
    font-size: 1.4rem;
  }
}

@media (max-width: 577px) {
  #top_overview {
    padding: 4rem 0;
  }
  #top_overview th,
  #top_overview td {
    padding: 1.5rem 0;
  }
  #top_overview ul {
    font-size: 1.2rem;
  }
}

/* スポンサー */

#top_sponsors {
  padding: 5rem 0 6rem;
}

#top_sponsors h3 {
  background-color: #ebebeb;
  padding: 0 1rem;
  margin-bottom: 2rem;
  text-align: center;
}

.diamond {
  background: linear-gradient(135deg, #ffcce6 0%, #fff5ba 12%, #fff 25%, #d4f0d4 37%, #ecfcfe 50%, #cce6ff 62%, #fff 75%, #e6ccff 87%, #ffccf2 100%);
}
.platinum {
  background: linear-gradient(135deg, #757575 0%, #fff 50%, #bdbdbd 100%);
}
.gold {
  background: linear-gradient(135deg, #d4c4a8 0%, #fff 50%, #bca578 100%);
}
.silver {
  background: linear-gradient(135deg, #a6a6a6 0%, #fff 50%, #999 100%);
}

#sponsor_app {
  padding: 5rem 0 6rem;
  background: linear-gradient(170deg, #f0fbfe, #beecfa);
}

@media (max-width: 577px) {
  #top_sponsors {
    padding: 4rem 0;
  }
  #sponsor_app {
    padding: 4rem 0;
  }
  #sponsor_app p br {
    display: none;
  }
}

/* 確認事項 */

#top_rules {
  padding: 5rem 0 6rem;
}

.accordion-item {
  background-color: #fff;
  margin-bottom: .8rem;
  overflow: hidden;
  border-radius: 4px;
  border: 1px solid #ddd;
}
.accordion-header {
  width: 100%;
  padding: .6rem 2rem;
  background-color: #fff;
  border: none;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
}
.accordion-icon {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 2px solid #666;
  border-bottom: 2px solid #666;
  transform: rotate(45deg);
  transition: transform 0.3s ease;
  margin-top: -4px; 
}
.accordion-item.is-open .accordion-icon {
  transform: rotate(-135deg);
  margin-top: 2px;
}
.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background-color: #fff;
}
.accordion-text {
  padding: 1.5rem 2rem;
  border-top: 1px solid #eee;
  line-height: 1.7;
  margin: 0;
  font-size: 1.6rem;
}

@media (max-width: 577px) {
  .accordion-header {
    padding: .6rem 1.5rem;
    font-size: 1.4rem;
  }
  .accordion-text {
    padding: 1rem 1.5rem;
    font-size: 1.3rem;
  }
  #top_rules {
    padding: 4rem 0;
  }
}

/* 開催実績 */

#top_archive {
  padding: 4rem 0 6rem;
  background-color: #00243e;
  color: #fff;
}

#top_archive a {
  color: #fff;
}

.readmore-check {
  display: none;
}

.readmore-content {
  position: relative;
  overflow: hidden;
  max-height: 350px; /* ここで初期の高さを指定 */
  transition: max-height 0.4s ease; /* スムーズに開くアニメーション */
  line-height: 1.6;
  font-size: 1.4rem;
}
.readmore-content::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background: linear-gradient(to bottom, rgba(3,27,47,0) 0%, rgba(3,27,47,1) 100%);
  pointer-events: none;
}

.readmore-label {
  display: block;
  padding: 1rem;
  text-align: center;
  background-color: transparent;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
  border: 1px solid #fff;
  border-radius: 7px;
}

.readmore-label:hover {
  opacity: .8;
}

.readmore-label::before {
  content: "もっとみる ＋";
}

.readmore-check:checked ~ .readmore-content {
  max-height: 3000px; /* 高さを広げて全文を表示させる（十分大きな値を設定） */
}
.readmore-check:checked ~ .readmore-content::after {
  display: none;/* グラデーションのぼかしを消す */
}
.readmore-check:checked ~ .readmore-label::before {
  content: "閉じる －";
}

@media (max-width: 577px) {
  #top_archive {
    padding: 3rem 0 4rem;
  }

  .readmore-content {
    font-size: 1.2rem;
  }
  .readmore-label {
    padding: .5rem;
    border-radius: 6px;
  }
}

/*--------------------
      共通フッター
--------------------*/

footer {
  padding: 3rem 0;
  background-color: #000;
  color: #fff;
  line-height: 1.8;
  text-align: center;
  font-size: 1.4rem;
}
footer a {
  color: #fff;
}
.sns {
  text-align: center;
}
.sns img {
  display: inline-block;
}
.sns img.x {
  width: 35px;
}
.sns img.facebook {
  width: 40px;
}

@media (max-width: 577px) {
  footer {
    font-size: 1rem;
  }
}

/* トップへ戻るボタン */

.scroll-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background-color: #666;
  color: #fff;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 1.5em;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 1000;
}

.scroll-to-top.is-visible {
  opacity: .8;
  pointer-events: auto;
  transform: translateY(0);
}