/* ==========================================================================
   全体の基本設定 & リセット
   ========================================================================== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background-color: #111;
  color: #fff;
  line-height: 1.6;
  overflow-x: hidden; /* 横スクロールのハミ出しを防止 */
}

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

ul {
  list-style: none;
}

.section-padding {
  padding: 80px 20px;
}

.bg-dark {
  background-color: #161616;
}

.page-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-title {
  font-size: 2.5rem;
  text-align: center;
  letter-spacing: 4px;
  margin-bottom: 10px;
  color: #ff9900;
  text-transform: uppercase;
}

.section-sub-text {
  text-align: center;
  color: #aaa;
  margin-bottom: 40px;
  font-size: 0.95rem;
}

/* ==========================================================================
   ヘッダー（PC & スマホ共通）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.site-logo a {
  font-size: 1.2rem;
  font-weight: bold;
  letter-spacing: 1.5px;
  white-space: nowrap;
  color: #fff;
}

.site-nav ul {
  display: flex;
  gap: 20px;
}

.site-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 1px;
  transition: color 0.3s;
  color: #ccc;
}

.site-nav a:hover,
.site-nav a.active {
  color: #ff9900;
}

/* ==========================================================================
   ① HOME (HERO) - 背景写真を削除してグラデーションに変更
   ========================================================================== */
.hero-section {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  /* 写真（url）を消して、深みのあるシックな暗めグラデーションに変更 */
  background: linear-gradient(135deg, #0d0d0d 0%, #1e1208 50%, #000000 100%);
  position: relative;
}

.hero-content {
  padding: 0 20px;
  width: 100%;
}

.hero-sub {
  font-size: 1.1rem;
  letter-spacing: 3px;
  margin-bottom: 15px;
  text-transform: uppercase;
  color: #eee;
}

.hero-copy {
  font-size: 3.2rem;
  font-weight: bold;
  margin-bottom: 25px;
  letter-spacing: 2px;
  line-height: 1.3;
  text-shadow: 2px 2px 10px rgba(0,0,0,0.6);
}

.hero-date {
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 5px;
}

.hero-place, .hero-price {
  font-size: 1.1rem;
  letter-spacing: 1px;
}

.scroll-down {
  position: absolute;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  letter-spacing: 2px;
  animation: bounce 2s infinite;
  color: #aaa;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translate(-50%, 0); }
  40% { transform: translate(-50%, -8px); }
  60% { transform: translate(-50%, -4px); }
}

/* ==========================================================================
   ② ABOUT
   ========================================================================== */
.concept-flex-container {
  display: flex;
  flex-wrap: wrap;
  gap: 60px;
  margin-top: 50px;
}

.concept-text-block {
  flex: 1;
  min-width: 300px;
}

.concept-block-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: #fff;
  margin-bottom: 8px;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.concept-block-sub {
  font-size: 0.8rem;
  color: #ff9900; 
  font-weight: 400;
  letter-spacing: 5px;
  text-transform: uppercase;
  margin-bottom: 30px;
  display: block;
}

.concept-pure-text {
  font-size: 0.95rem;
  line-height: 2.1;
  color: #bbb;
  margin-bottom: 25px;
  letter-spacing: 0.5px;
}

.concept-pure-text:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   ③ ARTISTS（縦長3:4枠固定）
   ========================================================================== */
.artists-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.artist-card {
  background-color: #1a1a1a;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.artist-card:hover {
  transform: translateY(-5px);
}

.artist-img-wrapper {
  width: 100% !important;
  aspect-ratio: 3 / 4 !important;
  height: auto !important;
  overflow: hidden !important;
  position: relative !important;
  background-color: #111;
  flex-shrink: 0;
}

.artist-img {
  width: 100% !important;
  height: 100% !important;
  object-fit: contain !important;
  object-position: center !important;
  display: block !important;
  transition: transform 0.4s ease;
}

.artist-card:hover .artist-img {
  transform: scale(1.03);
}

.artist-info {
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  background-color: #1a1a1a;
}

.artist-part {
  font-size: 0.8rem;
  color: #ff9900;
  text-transform: uppercase;
  font-weight: bold;
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.artist-name {
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: #fff;
  font-weight: bold;
}

.artist-profile {
  font-size: 0.88rem;
  color: #aaa;
  line-height: 1.65;
}

/* ==========================================================================
   ④ VENUE / SPONSOR / NEWS / CONTACT
   ========================================================================== */
.venue-info { text-align: center; margin-bottom: 40px; }
.venue-info h3 { font-size: 2rem; color: #fff; margin-bottom: 10px; }
.venue-address { color: #ff9900; font-weight: bold; margin-bottom: 5px; }
.venue-access { color: #aaa; font-size: 0.9rem; }

.iframe-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  border-radius: 8px;
  overflow: hidden;
}

.iframe-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.sponsor-recruit {
  background-color: #1a1a1a;
  padding: 40px 30px;
  border-radius: 12px;
  text-align: center;
}

.sponsor-recruit h3 { font-size: 1.6rem; margin-bottom: 15px; color: #fff; }

.sponsor-benefits {
  text-align: left;
  max-width: 500px;
  margin: 25px auto;
  background-color: #222;
  padding: 20px;
  border-radius: 8px;
}

.btn-sponsor-contact {
  display: inline-block;
  background-color: #ff9900;
  color: #000;
  font-weight: bold;
  padding: 12px 30px;
  border-radius: 30px;
  margin-top: 15px;
}

.news-list { background-color: #1a1a1a; border-radius: 12px; overflow: hidden; }
.news-item { display: flex; align-items: center; padding: 20px 25px; border-bottom: 1px solid #2a2a2a; flex-wrap: wrap; gap: 15px; }
.news-date { color: #888; font-family: monospace; font-size: 0.95rem; }
.news-category { font-size: 0.75rem; font-weight: bold; padding: 3px 10px; border-radius: 4px; color: #fff; }
.tag-info { background-color: #0076a3; }
.news-title { color: #ddd; flex: 1; min-width: 250px; }

.contact-text { text-align: center; color: #ccc; margin-bottom: 40px; }
.contact-button-wrapper { text-align: center; margin: 20px auto 40px; max-width: 500px; }
.contact-email-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
  border: 2px solid #ff9900;
  padding: 24px 40px;
  border-radius: 12px;
}
.btn-label { font-size: 0.75rem; color: #ff9900; letter-spacing: 3px; font-weight: 700; margin-bottom: 6px; }
.btn-address { font-size: 1.1rem; color: #fff; font-weight: bold; word-break: break-all; }

.site-footer {
  text-align: center;
  padding: 30px 20px;
  background-color: #000;
  font-size: 0.8rem;
  color: #666;
  border-top: 1px solid #222;
}

/* ==========================================================================
   📱 スマホ専用レスポンシブ設定 (画面幅768px以下)
   ========================================================================== */
@media screen and (max-width: 768px) {
  /* ヘッダー周りのスマホ最適化 */
  .header-container {
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 15px;
    gap: 8px;
  }
  
  .site-logo a {
    font-size: 0.95rem;
    letter-spacing: 1px;
    display: block;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .site-nav ul {
    gap: 12px;
    white-space: nowrap;
  }

  .site-nav a {
    font-size: 0.75rem;
  }

  /* メインビジュアルの文字調整 */
  .hero-copy {
    font-size: 1.8rem;
    letter-spacing: 1px;
    margin-bottom: 20px;
  }
  .hero-sub {
    font-size: 0.85rem;
    letter-spacing: 2px;
  }
  .hero-date {
    font-size: 1.3rem;
  }
  .hero-place, .hero-price {
    font-size: 0.95rem;
  }

  /* ABOUTセクションの見出し折り返し調整 */
  .page-title {
    font-size: 1.8rem;
    letter-spacing: 2px;
  }
  .concept-block-title {
    font-size: 1.6rem;
    line-height: 1.4;
  }
  .concept-flex-container {
    gap: 35px;
    margin-top: 30px;
  }

  /* アーティストカード（1列） */
  .artists-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .section-padding {
    padding: 50px 15px;
  }
}
/* ==========================================================================
   📱 スマホ専用レスポンシブ設定 (画面幅768px以下)
   ========================================================================== */
@media screen and (max-width: 768px) {
  /* ヘッダー周りのスマホ最適化（メニューを折り返して見切れ防止） */
  .header-container {
    flex-direction: column;
    align-items: center;
    padding: 10px 15px;
    gap: 6px;
  }
  
  .site-logo a {
    font-size: 1rem;
    letter-spacing: 1px;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    text-align: center;
  }

  .site-nav ul {
    display: inline-flex;
    gap: 15px;
    white-space: nowrap;
    padding: 0 10px;
  }

  .site-nav a {
    font-size: 0.75rem;
  }

  /* メインビジュアルの文字調整 */
  .hero-copy {
    font-size: 2.2rem;
    letter-spacing: 1px;
    margin-bottom: 20px;
    line-height: 1.4;
  }
  .hero-sub {
    font-size: 0.85rem;
    letter-spacing: 2px;
  }
  .hero-date {
    font-size: 1.3rem;
  }
  .hero-place, .hero-price {
    font-size: 0.95rem;
  }

  /* アーティストカード（1列） */
  .artists-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .section-padding {
    padding: 50px 15px;
  }
}