style.css

/* Google Fonts (Inter) を読み込みます */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;700;900&display=swap");

/* リセットCSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* HTML要素とBody要素の背景色を明示的に設定（Androidブラウザ対応） */
html {
  background-color: #232323;
  background: #232323;
}

/* Interフォントを全体に適用します */
body {
  font-family: "Inter", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #232323;
  background: #232323; /* Androidブラウザ用のフォールバック */
  color: #fbfbfb;
  min-height: 100vh; /* 高さを確実に設定 */
}

/* 言語切り替えボタンのスタイル */
.language-switcher {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  gap: 5px;
}

.lang-btn {
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-weight: bold;
  transition: all 0.3s ease;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lang-btn.active {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
  .language-switcher {
    top: 10px;
    right: 10px;
  }
}

/* コンテナスタイル */
.container {
  max-width: 1200px;
  margin: 3rem auto;
  padding: 0 1.5rem;
  min-height: 100vh;
  display: flex;
  display: -webkit-flex; /* Androidブラウザ用 */
  flex-direction: column;
  -webkit-flex-direction: column; /* Androidブラウザ用 */
  align-items: center;
  -webkit-align-items: center; /* Androidブラウザ用 */
  justify-content: center;
  -webkit-justify-content: center; /* Androidブラウザ用 */
  text-align: center;
}

/* メインコンテンツ */
main {
  display: flex;
  display: -webkit-flex; /* Androidブラウザ用 */
  flex-direction: column;
  -webkit-flex-direction: column; /* Androidブラウザ用 */
  align-items: center;
  -webkit-align-items: center; /* Androidブラウザ用 */
  justify-content: center;
  -webkit-justify-content: center; /* Androidブラウザ用 */
  width: 100%;
}

/* メインタイトル */
.main-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding-top: 4rem;

  .main-visual-pc {
    width: 120%;
    /* max-width: 900px; */
    height: auto;
  }
}

.main-visual-sp {
  display: none;
}

@media (max-width: 768px) {
  .main-title {
    padding-top: 2rem;
  }

  .main-visual-pc {
    display: none;
  }

  .main-visual-sp {
    display: block;
    width: 90%;
  }
}

/* ロゴ画像 */
.logo {
  width: 90px;
  height: auto;
}

/* イベント詳細セクション */
.event-details {
  margin: 3rem 0;
  border-top: 2px solid #374151;
  border-bottom: 2px solid #374151;
  width: 100%;
  max-width: 42rem;
  padding: 2rem 0;
}

.event-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.info-item {
  text-align: center;
}

.info-label {
  font-size: 0.875rem;
  color: #9ca3af;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.info-value {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
}

/* Junctionについてセクション */
.about-junction {
  max-width: 800px;
  padding: 1.5rem;
  margin-top: 2rem;
  line-height: 1.6;
  color: #9ca3af;
}

.about-text {
  font-size: 1.25rem;
}

/* Junction Platform リンク */
.junction-platform-link {
  margin: 2rem 0;
}

.platform-link {
  color: #fbfbfb;
  text-decoration: underline;
  font-size: 1.3rem;
  font-weight: 700;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.platform-link:hover {
  color: #d1d5db;
  opacity: 1;
  text-decoration: underline;
}

/* エントリーセクション */
.entry-section {
  width: 100%;
  margin: 3rem;
}

.entry-button {
  background-color: #ffffff;
  color: #000000;
  font-weight: 700;
  font-size: 1.5rem;
  padding: 1.25rem 3.5rem;
  text-decoration: none;
  display: inline-block;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(0);
}

.entry-button:hover {
  background-color: #f0f0f0;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* モバイル表示での調整 */
@media (max-width: 768px) {
  .entry-button {
    font-size: 1.3rem;
    padding: 1.1rem 2.5rem;
  }
}

/* SNSリンクセクション */
.sns-info {
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  color: #9ca3af;
}

.sns-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
  font-size: 1.125rem;
}

.x-logo,
.instagram-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 6rem;
  height: 6rem;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;

  transition: all 0.3s ease;

  img {
    width: 2.5rem;
    height: auto;
  }
}

.x-logo:hover,
.instagram-logo:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}

.instagram-logo {
  margin-bottom: 0.5rem;
}

/* フッター */
footer {
  width: 100%;
  padding: 1.5rem;
  text-align: center;
}

.footer-text {
  font-size: 0.75rem;
  color: #6b7280;
}

/* アニメーション */
.fade-in-up {
  animation: fadeInUp 1s ease-out forwards;
  opacity: 0;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 単純なフェードイン（タイムテーブルで使用） */
.fade-in {
  opacity: 0;
  animation: fadeIn 0.9s ease-out forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* アニメーションの遅延を設定 */
.delay-1 {
  animation-delay: 0.2s;
}

.delay-2 {
  animation-delay: 0.4s;
}

.delay-3 {
  animation-delay: 0.6s;
}

.delay-4 {
  animation-delay: 0.8s;
}

.delay-5 {
  animation-delay: 1s;
}

/* パートナーセクション */
.partners-section {
  width: 100vw;
  margin: 0;
}

.partners-slider {
  width: 70%;
  min-width: 450px;
  overflow: hidden;
  position: relative;
  padding: 2rem 0;
  margin: 0 auto;
  -webkit-mask-image: linear-gradient(
    to right,
    transparent,
    #000 10%,
    #000 90%,
    transparent
  );
  mask-image: linear-gradient(
    to right,
    transparent,
    #000 10%,
    #000 90%,
    transparent
  );
}

.partners-track {
  display: flex;
  align-items: center;
  width: fit-content;
  animation: none; /* 初期状態ではアニメーションを無効にする */
}

.partners-track.animated {
  animation: scroll 8s linear infinite;
}

.partner-logo {
  flex: 0 0 auto;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 4rem;
}

/* 白背景が必要なロゴ用のスタイル */
.partner-logo.white-bg img {
  background: rgba(255, 255, 255, 0.9);
  padding: 0.5rem;
}

.partner-logo img {
  max-height: 80px;
  min-width: 60px;
  max-width: 350px;
  object-fit: contain;
  filter: brightness(1) contrast(1);
  transition: filter 0.3s ease;
}

/* 白背景でない場合のimg要素のスタイルは従来通り */
.partner-logo:not(.white-bg) img {
  filter: brightness(0.8) contrast(1.2);
}

/* 無限スライドアニメーション */
@keyframes scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* パートナーが少数の場合の中央配置 */
.partners-track.static {
  animation: none !important;
  justify-content: center;
  width: 100%;
}

.partners-slider.static {
  -webkit-mask-image: none;
  mask-image: none;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
  .partners-slider {
    width: 90%;
    min-width: 300px;
  }
  .partner-logo {
    height: 70px;
    margin: 0 2rem;
  }
  .partner-logo img {
    max-height: 50px;
    min-width: 40px;
  }
}

/* FAQ セクション */
.faq-section {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}

.faq-item {
  margin-bottom: 0.5rem;
  border: 1px solid rgba(251, 251, 251, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1rem;
  background: transparent;
  border: none;
  color: rgba(251, 251, 251, 0.9);
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
}

.faq-question:hover {
  background-color: rgba(251, 251, 251, 0.05);
}

.faq-question:focus {
  outline: none;
  background-color: rgba(251, 251, 251, 0.05);
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background-color: rgba(251, 251, 251, 0.02);
  text-align: left;

  a {
    color: #ffffff;
    text-decoration: underline;
  }
}

.faq-answer.active {
  max-height: 200px;
}

.faq-answer p {
  padding: 1rem;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(251, 251, 251, 0.7);
  text-align: left;
}

/* タイムテーブル（SCHEDULE）セクション */
.schedule-section {
  text-align: left; /* スケジュールセクションのみ左寄せ */
}

.schedule-section * {
  text-align: left; /* スケジュールセクション内の全要素を左寄せ */
}

.schedule-section .section-title {
  text-align: center; /* タイトルのみ中央寄せを維持 */
}

/* 共通セクションスタイル */
.content-section {
  width: 100%;
  max-width: 64rem;
  margin: 4rem auto;
  text-align: center;
}

/* 動画セクション */
.video-section {
  margin: 4rem auto;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  aspect-ratio: 16 / 9;
}

.video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
}

.video-play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 10;
  transition: all 0.3s ease;
  opacity: 0.9;
}

.video-play-button:hover {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.1);
}

.video-play-button svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.5));
}

.video-play-button.hidden {
  opacity: 0 !important;
  pointer-events: none !important;
  transition: opacity 0.3s ease;
}

/* デスクトップのみでhover時に再生ボタンを表示 */
@media (hover: hover) and (pointer: fine) {
  .video-container:hover .video-play-button.hidden {
    opacity: 0.4 !important;
    pointer-events: auto !important;
  }

  .video-container:hover .video-play-button.hidden:hover {
    opacity: 0.8 !important;
  }
}

.video-fallback {
  padding: 3rem 2rem;
  color: rgba(251, 251, 251, 0.7);
  font-size: 1rem;
  text-align: center;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .video-section {
    margin: 2.5rem auto;
  }

  .video-container {
    border-radius: 8px;
  }

  .video-fallback {
    padding: 2rem 1rem;
    font-size: 0.9rem;
  }
}

/* 共通見出しスタイル */
.section-title {
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: 3rem;
  color: #fbfbfb;
  letter-spacing: 0.1em;
  text-align: center;
}

.schedule-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.day-schedule h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #374151;
}

.day-schedule ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.day-schedule li {
  display: flex;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.day-schedule li:last-child {
  margin-bottom: 0;
}

.day-schedule time {
  width: 6rem;
  flex: 0 0 auto;
  color: #9ca3af;
  font-size: 1rem;
  margin-right: 1rem;
}

.day-schedule span {
  flex: 1;
  color: #ffffff;
  font-size: 1rem;
}

/* レスポンシブデザイン */
@media (min-width: 768px) {
  .content-section {
    margin: 5rem auto;
  }

  .section-title {
    font-size: 2.25rem;
  }

  .schedule-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }

  .main-title {
    font-size: 6rem;
  }

  .about-text {
    font-size: 1.5rem;
  }

  .entry-button {
    font-size: 1.6rem;
    padding: 1.4rem 4rem;
  }

  .faq-question {
    font-size: 1.1rem;
  }

  .faq-answer p {
    font-size: 1rem;
  }
}

/* 審査員（JUDGES）セクション */
.judges-section {
  text-align: center;
}

.judges-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 2rem;
}

.judge-item {
  text-align: center;
}

.judge-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.judge-title {
  font-size: 1rem;
  color: rgba(251, 251, 251, 0.7);
  line-height: 1.5;
}

.judges-note {
  font-size: 0.875rem;
  color: rgba(251, 251, 251, 0.5);
  font-style: italic;
  text-align: center;
}

/* 賞金（PRIZES）セクション */
.prizes-section {
  text-align: center;
}

.prizes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.prize-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 200px;
}

.prize-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.grand-prize {
  border-color: #ffd700;
  background: rgba(255, 215, 0, 0.1);
}

.grand-prize:hover {
  background: rgba(255, 215, 0, 0.15);
  border-color: #ffd700;
}

.second-prize {
  border-color: #c0c0c0;
  background: rgba(192, 192, 192, 0.1);
}

.second-prize:hover {
  background: rgba(192, 192, 192, 0.15);
  border-color: #c0c0c0;
}

.third-prize {
  border-color: #cd7f32;
  background: rgba(205, 127, 50, 0.1);
}

.third-prize:hover {
  background: rgba(205, 127, 50, 0.15);
  border-color: #cd7f32;
}

.prize-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
  text-align: center;
}

.prize-amount {
  font-size: 1.25rem;
  color: #fbfbfb;
  font-weight: 600;
  text-align: center;
  line-height: 1.4;
}

.grand-prize .prize-amount {
  color: #ffd700;
  font-weight: 700;
}

.second-prize .prize-amount {
  color: #c0c0c0;
  font-weight: 700;
}

.third-prize .prize-amount {
  color: #cd7f32;
  font-weight: 700;
}

/* レスポンシブデザイン（賞金セクション用） */
@media (min-width: 768px) {
  .judges-grid {
    flex-direction: row;
    justify-content: center;
    gap: 4rem;
  }

  .judge-item {
    flex: 1;
    max-width: 300px;
  }

  .judge-name {
    font-size: 1.5rem;
  }

  .judge-title {
    font-size: 1.1rem;
  }

  .prizes-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .prize-item {
    padding: 3rem 2.5rem;
    min-height: 220px;
  }

  .prize-title {
    font-size: 1.75rem;
  }

  .prize-amount {
    font-size: 1.5rem;
  }
}

/* Supporting University セクション */
.supporting-university-section {
  text-align: center;
}

.university-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
}

.university-logo {
  max-width: 120px;
  height: auto;
  transition: transform 0.3s ease;
}

.university-logo img {
  width: 100%;
  height: auto;
  display: block;
}

/* kit.png の背景を白に設定 */
.university-logo.kit {
  background-color: white;
  padding: 1rem;
}

/* レスポンシブデザイン */
@media (min-width: 768px) {
  .university-logos {
    gap: 4rem;
  }

  .university-logo {
    max-width: 150px;
  }
}

/* Supporting Organization セクション */
.supporting-organization-section {
  text-align: center;
}

.organization-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
}

.organization-logo {
  max-width: 120px;
  height: auto;
  transition: transform 0.3s ease;
}

.organization-logo img {
  width: 100%;
  height: auto;
  display: block;
}

/* レスポンシブデザイン */
@media (min-width: 768px) {
  .organization-logos {
    gap: 4rem;
  }

  .organization-logo {
    max-width: 150px;
  }
}

/* Meet Our Team セクション */
.team-section {
  text-align: center;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.team-member {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.team-member:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: scale(1.03);
  border-color: rgba(255, 255, 255, 0.2);
}

.member-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fbfbfb;
  margin-bottom: 0.5rem;
}

.member-role {
  font-size: 1rem;
  color: #9ca3af;
  font-weight: 400;
}

/* レスポンシブデザイン */
@media (min-width: 768px) {
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .team-member {
    height: 135px;
    padding: 2rem 1.5rem;
  }

  .member-name {
    font-size: 1.375rem;
  }

  .member-role {
    font-size: 0.9rem;
  }
}

@media (max-width: 767px) {
  .team-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .team-member {
    padding: 1.25rem;
  }
}

/* Track Themes セクション */
.track-themes-section {
  text-align: center;
}

.track-themes-content {
  max-width: 800px;
  margin: 0 auto;
}

.track-themes-list {
  margin-bottom: 1.5rem;
}

.track-highlight {
  font-size: 1.6rem;
  font-weight: 700;
  color: #ffffff;
  display: block;
  padding: 2rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  background-color: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(5px);
  transition: all 0.3s ease;
  letter-spacing: 0.5px;

  span {
    font-weight: 500;
  }
}

.track-highlight:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.track-themes-note {
  font-size: 0.9rem;
  color: #cccccc;
  font-style: italic;
}

/* Supporter セクション */
.supported-by-logos,
.kcv {
  width: 250px !important;
  height: auto;
  margin: 0 auto;
}

/* レスポンシブデザイン */
@media (min-width: 768px) {
  .track-highlight {
    br {
      display: none;
    }
  }
}

@media (max-width: 768px) {
  .track-highlight {
    font-size: 1.3rem;
    padding: 1.5rem 1rem;

    br {
      display: none;
    }
  }
}

@media (max-width: 480px) {
  .track-highlight {
    font-size: 1.1rem;
    padding: 1rem 0.8rem;
    line-height: 2rem;

    span {
      display: none;
    }

    br {
      display: block;
    }
  }
}