html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
  color: #1b1b1b;
  background: #fff;
}

/* =========================
   濃紺ベースへ変更
========================= */
.night-nav {
  background: rgba(7, 26, 51, .92);
  backdrop-filter: blur(10px);
}

.navbar-brand {
  letter-spacing: .08em;
}

/* =========================
   濃紺ベースへ変更
========================= */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #071a33;
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .55;
}

/* =========================
   hero グラデーション削除
========================= */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(7, 26, 51, .100);
}

.hero-copy {
  padding-top: 90px;
  max-width: 760px;
}

.hero-kicker {
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #ffc107;
  font-weight: 700;
}

.hero-copy h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: .92;
  letter-spacing: .02em;
  text-transform: uppercase;
}

.hero-copy h1 span {
  color: #ffc107;
}

.hero-date {
  display: inline-block;
  margin-top: 24px;
  padding: 10px 22px;
  border: 1px solid rgba(255, 255, 255, .5);
  border-radius: 999px;
  font-size: 1.4rem;
  letter-spacing: .12em;
}

.section-block {
  padding: 90px 0;
}

/* =========================
   濃紺ベースへ変更
========================= */
.dark-block {
  background: #071a33;
  color: #fff;
}

.section-title {
  text-align: center;
  margin-bottom: 46px;
}

.section-title h2 {
  font-size: clamp(2rem, 4vw, 3.3rem);
  font-weight: 900;
  letter-spacing: .08em;
}

.section-title p {
  color: #d59b00;
  font-weight: 700;
  letter-spacing: .12em;
}

.section-title.light p {
  color: #ffc107;
}

.content-panel,
.info-card {
  background: #fff;
  color: #1b1b1b;
  border-radius: 24px;
  padding: 34px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, .12);
}

.info-row {
  display: flex;
  gap: 10px;
  align-items: center;
  border-bottom: 1px dashed #ddd;
  padding: 16px 0;
  flex-wrap: wrap;
}

.info-row .date {
  font-weight: 800;
  color: #222;
}

.info-row .cat {
  color: #d59b00;
  font-weight: 700;
}

.info-row a {
  color: #111;
  font-weight: 700;
}

.result-link {
  display: inline-block;
  background: #111;
  color: #fff;
  text-decoration: none;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 800;
}

.entry-img {
  background: #fff;
  border-radius: 18px;
  padding: 15px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, .12);
}

.guest-card {
  height: 100%;
  background: #fff;
  border-radius: 26px;
  overflow: hidden;
  box-shadow: 0 18px 45px rgba(0, 0, 0, .12);
}

/* =========================
   MC / ゲスト画像を枠内表示
========================= */
.guest-card img {
  width: 100%;
  height: 380px;
  object-fit: contain;
  background: #eef3f8;
  padding: 18px;
}

.guest-card .role {
  font-weight: 900;
  color: #d59b00;
}

.guest-card h3 {
  font-weight: 900;
  font-size: 2rem;
}

.guest-card .en {
  letter-spacing: .08em;
  color: #666;
}

.sns-block {
  background: #f8f6ef;
}

.sns-card {
  height: 100%;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  background: #111;
  color: #fff;
  text-decoration: none;
  border-radius: 26px;
  font-size: 1.4rem;
  font-weight: 900;
  overflow: hidden;
}

.sns-card img {
  max-width: 100%;
  max-height: 160px;
  object-fit: contain;
}

.sns-card.instagram {
  background: linear-gradient(135deg, #341d5c, #f15a24);
}

.sponsor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.sponsor-grid.special {
  grid-template-columns: repeat(1, 1fr);
  max-width: 560px;
  margin-inline: auto;
}

.sponsor-logo {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 18px;
  padding: 18px;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, .06);
}

.sponsor-logo img {
  max-width: 100%;
  max-height: 90px;
  object-fit: contain;
}

.photo-card {
  background: #fff;
  border-radius: 18px;
  overflow: hidden;
  color: #111;
  height: 100%;
}

.photo-card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  background: #eee;
}

.photo-card p {
  padding: 16px;
  font-weight: 800;
  margin: 0;
}

.footer-logo-grid {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

.footer-logo-grid img {
  max-height: 90px;
  max-width: 220px;
  object-fit: contain;
}
.guest-links{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:15px;
}

.guest-links a{
  display:inline-flex;
  align-items:center;
  justify-content:center;

  min-width:140px;
  padding:10px 18px;

  background:#f6b500;
  color:#fff;

  border-radius:999px;
  text-decoration:none;
  font-weight:700;

  transition:all .25s ease;
}

.guest-links a:hover{
  background:#071a33;
  color:#fff;
  transform:translateY(-2px);
}

.guest-links a:visited{
  color:#fff;
}
.footer-logo-vertical{
  display:flex;
  flex-direction:column;
  gap:20px;
  align-items:center;
}

.footer-logo-item{
  width:100%;
  text-align:center;
}

.footer-logo-item img{
  max-width:100%;
  height:auto;
  display:block;
  margin:0 auto;
}
/* スマホ用ロゴ */
.navbar-logo-mobile{
    display:block;
    width:180px;      /* 表示幅 */
    max-width:100%;
    height:auto;
}

@media (max-width:576px){

    .navbar-logo-mobile{
        width:150px;
    }

}
/* =========================
   濃紺ベースへ変更
========================= */
.footer {
  background: #071a33;
  color: #fff;
}

.footer a {
  color: #ffc107;
}

.volunteer-btn{
  background:#fff !important;
  color:#071a33 !important;
  border:2px solid #fff !important;
}

.volunteer-btn:hover{
  background:transparent !important;
  color:#fff !important;
}

/* メディアクエリ: 画面幅991px以下 */
@media(max-width:991px){
  .section-block{ padding:70px 0; }
  .sponsor-grid{ grid-template-columns:repeat(2, 1fr); }
  .hero-copy h1{ font-size:3.6rem; }

  .content-panel,
  .info-card{ padding:24px; }

  .guest-card img{
    height:280px;
    object-fit:contain;
  }

  .footer-logo-vertical{ margin-top:30px; }
}

@media(max-width:576px){
  .navbar-logo-mobile{ width:150px; }
  .hero-copy h1{ font-size:2.7rem; }
  .hero-date{ font-size:1rem; }
  .sponsor-grid{ grid-template-columns:1fr; }

  .content-panel,
  .info-card{ padding:20px; }
}

/* TOPへ戻るフロートボタン */
#backToTop{
  position:fixed;
  right:24px;
  bottom:24px;
  width:58px;
  height:58px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:linear-gradient(135deg,#ffc107,#f6a800);
  color:#071a33;
  font-size:28px;
  font-weight:900;
  text-decoration:none;
  box-shadow:0 10px 28px rgba(0,0,0,.28);
  z-index:99999;
}

#backToTop:hover{
  background:#071a33;
  color:#ffc107;
  transform:translateY(-4px);
}

@media(max-width:576px){
  #backToTop{
    right:16px;
    bottom:16px;
    width:50px;
    height:50px;
    font-size:24px;
  }
}