:root{
  --color-bg: #f4f7fb;
  --color-surface: #ffffff;
  --color-text: #0b1f3a;
  --color-text-sub: #4a5b73;
  --color-accent: #00afe2;
  --color-accent-dark: #0090bb;
  --color-accent-soft: #e6f7fc;
  --color-border: #dde6ef;
  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow-card: 0 10px 30px rgba(11, 31, 58, 0.08);
  --max-width: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

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

.container{
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== ナビゲーション ===== */
.site-nav{
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.site-nav .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand{
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav-logo{
  height: 40px;
  width: auto;
}

.nav-brand small{
  display: block;
  font-weight: 500;
  font-size: 11px;
  opacity: 0.85;
  letter-spacing: 0.08em;
}

.nav-toggle{
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}

.nav-links{
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a{
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background 0.2s ease;
}

.nav-links a:hover{
  background: rgba(255,255,255,0.18);
}

/* ===== ヒーロー ===== */
.hero{
  padding: 0;
  position: relative;
}

.sr-only{
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ヒーロー下のチラシビジュアル：幅100%で表示 */
.hero-banner img{
  display: block;
  width: 100%;
  height: auto;
}

/* ===== クイック情報バー（開催日・会場・参加費・CTA） ===== */
.hero-info{
  background: linear-gradient(120deg, #17c3e6, #00afe2 45%, #0077a8 100%);
  background-size: 220% 220%;
  animation: heroGradientShift 16s ease-in-out infinite;
  color: #fff;
  padding: 40px 0;
}

.hero-info .container{
  text-align: center;
}

@keyframes heroGradientShift{
  0%, 100%{ background-position: 0% 40%; }
  50%{ background-position: 100% 60%; }
}

@media (prefers-reduced-motion: reduce){
  .hero-info{
    animation: none;
  }
}

.hero-badge{
  display: inline-block;
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 999px;
  padding: 6px 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero-meta{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-meta span{
  background: rgba(255,255,255,0.16);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
}

.hero-cta{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.btn{
  display: inline-block;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary{
  background: #fff;
  color: var(--color-accent-dark);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.btn-primary:hover{ transform: translateY(-2px); }

.btn-outline{
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.8);
}

.btn-outline:hover{ background: rgba(255,255,255,0.15); }

.btn-solid{
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 175, 226, 0.35);
}

.btn-solid:hover{ background: var(--color-accent-dark); }

/* ===== セクション共通 ===== */
section{
  padding: 72px 0;
}

section:nth-of-type(even){
  background: var(--color-surface);
}

.section-head{
  text-align: center;
  margin-bottom: 44px;
}

.section-eyebrow{
  display: inline-block;
  color: var(--color-accent-dark);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.15em;
  margin-bottom: 10px;
}

.section-head h2{
  font-size: 28px;
  font-weight: 900;
  margin: 0;
}

.section-lead{
  color: var(--color-text-sub);
  font-size: 18px;
  line-height: 1.9;
  margin-top: 14px;
}

.card{
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 36px;
}

section:nth-of-type(even) .card{
  background: var(--color-bg);
  box-shadow: none;
  border: 1px solid var(--color-border);
}

.overview-card{
  display: flex;
  align-items: flex-start;
  gap: 28px;
}

.overview-card .info-list{
  flex: 1;
  min-width: 0;
}

.flyer-thumb{
  flex-shrink: 0;
  width: 200px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  transition: transform 0.15s ease;
}

.flyer-thumb:hover{
  transform: scale(1.04);
}

.flyer-thumb img{
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 定義リスト（概要テーブル） ===== */
.info-list{
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 0;
}

.info-list dt{
  padding: 16px 0;
  font-weight: 700;
  color: var(--color-accent-dark);
  border-bottom: 1px solid var(--color-border);
}

.info-list dd{
  margin: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.info-list dt:last-of-type,
.info-list dd:last-of-type{
  border-bottom: none;
}

.sponsor-link{
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--color-text);
  text-decoration: underline;
}

.sponsor-link:hover{
  color: var(--color-accent-dark);
}

.sponsor-logo{
  height: 22px;
  width: auto;
}

/* ===== 体験内容 ===== */
.experience-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.experience-grid .card h3{
  margin-top: 0;
  font-size: 17px;
  color: var(--color-accent-dark);
}

.highlight-copy{
  text-align: center;
  font-size: 22px;
  font-weight: 900;
  color: var(--color-accent-dark);
  margin: 40px 0 0;
}

/* ===== 開催日時・会場 ===== */
.event-date-badge{
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  border-radius: 999px;
  padding: 12px 32px;
  margin: 20px 0 8px;
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 0.02em;
}

.event-date-badge .day{
  font-size: 18px;
  font-weight: 800;
}

.venue-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.venue-card .venue-tag{
  display: inline-block;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-weight: 800;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.venue-card h3{
  margin: 0 0 6px;
  font-size: 20px;
}

.venue-time{
  font-size: 28px;
  font-weight: 900;
  color: var(--color-accent-dark);
  margin: 8px 0 16px;
}

.venue-place{
  color: var(--color-text-sub);
  font-size: 14.5px;
}

.map-link{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent-dark);
  font-weight: 600;
  text-decoration: underline;
}

.map-link:hover{
  color: var(--color-text);
}

.map-icon{
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ===== 参加費 ===== */
.fee-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.fee-card{
  text-align: center;
}

.fee-card h3{
  margin: 0 0 16px;
  font-size: 16px;
  color: var(--color-text-sub);
  font-weight: 700;
}

.fee-price{
  font-size: 34px;
  font-weight: 900;
  color: var(--color-accent-dark);
}

.fee-price small{
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-sub);
  margin-left: 6px;
}

.fee-note{
  font-size: 13px;
  color: var(--color-text-sub);
  margin-top: 8px;
}

.condition-box{
  text-align: center;
}

.condition-box .tag{
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-weight: 800;
  padding: 8px 22px;
  border-radius: 999px;
  margin-bottom: 14px;
  font-size: 14px;
}

.agreement-card{
  text-align: center;
}

.entry-cta{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.entry-qr img{
  width: 96px;
  height: 96px;
  border-radius: 8px;
  box-shadow: var(--shadow-card);
}

.entry-note{
  margin: 20px 0 0;
  color: var(--color-text-sub);
  font-size: 14.5px;
}

/* ===== お問い合わせ ===== */
.contact-card{
  max-width: 440px;
  margin: 0 auto;
  text-align: center;
}

.contact-logo{
  height: 26px;
  width: auto;
  margin: 0 auto 16px;
}

.contact-emblem{
  width: 90px;
  margin: 0 auto 20px;
}

.contact-card p{
  margin: 0 0 6px;
  font-size: 14.5px;
}

.contact-card p:last-child{
  margin-bottom: 0;
}

.contact-card a{
  color: var(--color-accent-dark);
  font-weight: 700;
  text-decoration: underline;
}

/* ===== フッター ===== */
footer{
  background: var(--color-text);
  color: rgba(255,255,255,0.75);
  padding: 32px 0;
  text-align: center;
  font-size: 13px;
}

footer strong{
  color: #fff;
  font-size: 14px;
}

.footer-emblem{
  width: 96px;
  margin: 0 auto 16px;
}

.footer-emblem img{
  width: 100%;
  height: auto;
}

/* ===== レスポンシブ ===== */
@media (max-width: 860px){
  .experience-grid,
  .venue-grid{
    grid-template-columns: 1fr;
  }
  .info-list{
    grid-template-columns: 1fr;
  }
  .info-list dt{
    padding-bottom: 4px;
    border-bottom: none;
  }
  .overview-card{
    flex-direction: column-reverse;
    align-items: center;
  }
}

@media (max-width: 720px){
  .nav-toggle{ display: inline-flex; }
  .nav-links{
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-accent);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 2px;
  }
  .nav-links.is-open{ display: flex; }
  .nav-links a{ padding: 12px 8px; }
  .nav-logo{ height: 32px; }
  .nav-brand small{ display: none; }
  .event-date-badge{ font-size: 22px; padding: 10px 22px; }
  .event-date-badge .day{ font-size: 14px; }
  section{ padding: 52px 0; }
  .card{ padding: 24px; }
}