@charset "utf-8";
html {
  font-size: 62.5%;
  overflow-x: hidden;
  scroll-behavior: smooth;
  scroll-padding-top: 70px; 
}
body {
  font-family: "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: 1.9;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

a {
  color: #09f;
}
ul li {
  margin-left: 2.5rem;
}
.small, small {
  font-size: 80%;
  line-height: 1.5;
}

.break-word {
  overflow-wrap: break-word;
}
.hover:hover {
  opacity: .8!important;
  transition: .3s;  
}
.font-bold {
  font-weight: 700;
}
.font-red {
  color: #f00;
  font-weight: 700;
}
.font-white {
  color: #fff;
}
.main {
  background-color: #f9fefa;
  color: #222; 
}

.box {
  max-width: 1000px;
  margin: auto;
  padding: 3rem 4rem;
  border-radius: 12px;
  box-shadow: 0px 5px 15px 0px rgba(0, 0, 0, 0.2);
  background-color: rgba(255, 255, 255, 1);
}

@media (max-width: 577px) {
  body {
    font-size: 1.4em;
  }
  .box {
    padding: 2rem;
    border-radius: 10px;
  }
}

.fade-in-up {
  animation: fadeInUp .8s ease-out forwards;
  opacity: 0; 
}
@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ボタン */

.btn-app {
  background: linear-gradient(180deg, #e35e31, #fc4b29);
  box-shadow: 3px 3px 10px 0px rgba(0, 0, 0, 0.3);
}
.btn-tt {
  background: linear-gradient(180deg, #384786, #162871);
  box-shadow: 3px 3px 10px 0px rgba(0, 0, 0, 0.3);
}
.btn-mail {
  width: 440px;
  background: linear-gradient(180deg, #e35e31, #fc4b29);
  box-shadow: 3px 3px 10px 0px rgba(0, 0, 0, 0.3);
  border: none;
  color: #fff;
}

.btn-app:hover,
.btn-tt:hover,
.btn-mail:hover {
  filter: brightness(1.2);
  transform: translateY(3px);
  transition: .2s; 
}
a.btn-app,
a.btn-tt,
a.btn-mail {
  color: #fff;
}

.btn-width {
  max-width: 440px;
  position: relative;
  display: block;
  padding: 2.8rem 1rem; 
  border-radius: 100px;
  margin: auto;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  font-size: 2rem;
  font-weight: 600;
  transition: all 0.2s;
}

.arrow-r::after {
  content: '';
  border: 0;
  border-top: solid 3px #fff;
  border-right: solid 3px #fff;
  display: inline-block;
  width: 10px;
  height: 10px;
  position: absolute;
  top: 50%;
  right: 22px;
  transform: translateY(-45%) rotate(45deg);
}

@media (max-width: 577px) {
  .btn-width {
    max-width: 85%;
    padding: 1.8rem 1rem; 
    font-size: 1.7rem;
  }
}

@media (max-width: 480px) {
  .btn-width {
    max-width: 90%;
  }
}

/* 見出し */

.headline {
  font-size: 3.6rem;
  line-height: 1.6;
  text-align: center;
  margin-bottom: 3rem;
}
#attendee .headline {
  font-size: 3.2rem;
}

@media (max-width: 577px) {
  .headline {
    font-size: 2.4rem;
    margin-bottom: 2rem;
  }
  #attendee .headline {
    font-size: 1.8rem;
  }
}

/* タイトル */

#title {
  padding: 3rem 0 4rem;
  background-image: url(../images/back.jpg?v=1790237459) ;
  background-position: right bottom;
  background-repeat: no-repeat;
  background-size: cover;
}

@media (max-width: 577px) {
  #title {
    padding: 2rem 0 2.5rem;
  }
}

/* スピーカー */

#speaker {
  padding: 4rem 0 5rem;
  background-color: #c6eed9;
  text-align: center;
}
.speaker-name {
  margin-top: .5rem;
  font-size: 2rem;
  line-height: 1.6;
}
.speaker-co {
  line-height: 1.6;
  font-size: 1.2rem;
}

@media (max-width: 577px) {
  #speaker {
    padding: 3rem 0 3.5rem;
  }
}

/* 参加募集 */

#attendee {
  padding: 4rem 0 5rem;
  background-color: #c6eed9;
  background-image: linear-gradient(45deg, #006cd6, #5cb000);
}

@media (max-width: 577px) {
  #attendee {
    padding: 3rem 0 3.5rem;
  }
}

/* 協賛募集 */

#sponsor {
  padding: 4rem 0 5rem;
}
#sponsor p {
  text-align: center;
}

@media (max-width: 577px) {
  #sponsor {
    padding: 3rem 0 3.5rem;
  }
  #sponsor p {
    text-align: left;
  }
  #sponsor p br {
    display: none;
  }
}

/* 参加者の声 */

#voice {
  padding: 4rem 0 5rem;
  background-color: #c6eed9;
}

.voices-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}
.voice-card {
  background-color: #fff;
  padding: 2rem 2.2rem;
  font-size: 1.6rem;
  font-weight: 700;
  box-shadow: 0 3px 10px rgba(0,0,0,0.2);
  border: 2px solid;
  border-image: linear-gradient(to right, #006cd6, #5cb000) 1;
}
.voice-card::before {
  content: "";
  display: inline-block;
  width: 32px;
  height: 32px;
  background-image: url("../images/speech-bubble.png?v=1790237459"); 
  background-size: contain;
  background-repeat: no-repeat;
  vertical-align: middle;
  margin-right: 8px;
  transform: translateY(-2px);
}

@media (max-width: 577px) {
  #voice {
    padding: 3rem 0 3.5rem;
  }
  .voices-grid {
    grid-template-columns: repeat(1, 1fr);
    gap: 10px;
  }
  .voice-card {
    padding: 1.5rem;
    font-size: 1.4rem;
  }
}

/* 開催によせて */

#greeting {
  padding: 4rem 0 5rem;
  background-image: linear-gradient(45deg, #006cd6, #5cb000);
  text-align: center;
}

@media (max-width: 991px) {
  #greeting {
    text-align: left;
  }
  #greeting p br {
    display: none;
  }
}

@media (max-width: 577px) {
  #greeting {
    padding: 3rem 0 3.5rem;
  }
}

/* 開催概要 */

#overview {
  padding: 4rem 0 5rem;
  background-image: url(../images/back.jpg?v=1790237459) ;
  background-position: bottom;
  background-repeat: no-repeat;
  background-size: cover;
}

#overview table {
  line-height: 1.7;
  font-size: 1.8rem;
  width: 100%;
}
#overview tr {
  border-bottom: 1px solid #ccc;
}
#overview tr:last-child {
  border-bottom: none;
}
#overview th,
#overview td {
  padding: 2rem 0;
}
#overview th {
  width: 120px;
  color: #066;
}

@media (max-width: 577px) {
  #overview {
    padding: 3rem 0rem 3.5rem;
  }
  #overview table {
    font-size: 1.4rem;
  }
  #overview th,
  #overview td {
    padding: 1rem 0;
  }
  #overview th {
    width: 85px;
  }
}

/* 行動規範 */

#rules {
  padding: 4rem 0 5rem;
  background-color: #fff;
}
#rules p {
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

@media (max-width: 577px) {
  #rules {
    padding: 3rem 0rem;
  }
  #rules p {
    font-size: 1.2rem;
  }
}

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

footer {
  padding: 3rem 0;
  background-color: #222;
  color: #fff;
  font-size: 1.4rem;
  line-height: 1.8;
  text-align: center;
}
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);
}