/* ===============================
   背景・基本設定
=============================== */
body {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  background: linear-gradient(135deg, #0a1a3f, #0f2d63 40%, #0a1a3f);
  color: #fff;
  text-align: center;
}

/* ===============================
   ロゴ
=============================== */
.site-logo {
  margin: 40px 0 10px;
}

.logo-main {
  width: 200px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}

.logo-sub {
  width: 140px;
  opacity: 0.9;
  margin-top: 6px;
}

/* ===============================
   サブコピー
=============================== */
.hero-simple {
  font-size: 20px;
  font-weight: 500;
  opacity: 0.95;
  margin: 10px 0 25px;
}

/* ===============================
   ボタンエリア（2階層構造）
=============================== */

/* 第1階層：エントリー（最重要・大サイズ） */
.index-btn-area {
  margin-top: 20px;
  text-align: center;
}

/* ★ luxury-btn-strong を “濃い金の最強ボタン” に上書き */
.index-btn-area .luxury-btn-strong {
  width: 100%;
  max-width: 340px; /* 中サイズより確実に大きい */
  padding: 18px 26px; /* luxury-btn より大きい */
  font-size: 20px;

  background: linear-gradient(135deg, #e6c14a, #c9970e);
  border: 1px solid rgba(255,255,255,0.45);
  color: #000;

  box-shadow:
    0 6px 14px rgba(0,0,0,0.35),
    inset 0 2px 4px rgba(255,255,255,0.5);

  border-radius: 12px;
  transition: 0.25s ease;
}

/* hover 強化 */
.index-btn-area .luxury-btn-strong:hover {
  background: linear-gradient(135deg, #f0d25a, #d6a81a);
  transform: translateY(-3px);
  box-shadow:
    0 10px 20px rgba(0,0,0,0.45),
    inset 0 2px 4px rgba(255,255,255,0.55);
}

/* 第2階層：サブ導線（銀の中サイズ） */
.index-sub-btn-area {
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}

.index-sub-btn-area .luxury-btn {
  width: 100%;
  max-width: 220px; /* ← 260 → 220 に変更 */
  padding: 12px 18px;
  font-size: 15px;

  background: linear-gradient(135deg, #d9d9d9, #b5b5b5);
  border: 1px solid rgba(255,255,255,0.35);
  color: #000;

  box-shadow:
    0 2px 4px rgba(0,0,0,0.25),
    inset 0 1px 2px rgba(255,255,255,0.4);

  transition: 0.25s ease;
}

/* サブ hover（控えめ） */
.index-sub-btn-area .luxury-btn:hover {
  background: linear-gradient(135deg, #e3e3e3, #c2c2c2);
  transform: translateY(-2px);
  box-shadow:
    0 4px 8px rgba(0,0,0,0.25),
    inset 0 1px 3px rgba(255,255,255,0.5);
}

/* ===============================
   HISTORY（縦タイムライン）
=============================== */
.timeline-vertical {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin: 40px auto;
  width: 90%;
  max-width: 480px;
}

.timeline-v-item {
  position: relative;
  padding-left: 26px;
  text-align: left;
  border-left: 3px solid #d4b253;
}

.timeline-v-item::before {
  content: "";
  width: 12px;
  height: 12px;
  background: #FFD700;
  border-radius: 50%;
  position: absolute;
  left: -7px;
  top: 4px;
}

.timeline-v-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.timeline-v-year {
  font-size: 20px;
  font-weight: 700;
}

.timeline-v-round {
  font-size: 14px;
  color: #FFD700;
}

.timeline-v-title {
  margin-top: 4px;
  font-size: 15px;
  color: #e6e6e6;
}

.timeline-v-winner {
  margin-top: 6px;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.timeline-v-winner::before {
  content: "優勝🏆 ";
  margin-right: 4px;
  color: #fff;
  font-weight: 600;
}

.winner-flag {
  width: 18px;
  height: 18px;
}

/* ===============================
   フッター
=============================== */
.top-footer {
  margin: 60px 0 20px;
  opacity: 0.7;
}

.footer-copy {
  font-size: 14px;
  color: #ddd;
}

/* ===============================
   リンクの下線を完全に消す
=============================== */
a {
  text-decoration: none;
  color: inherit;
}

/* ===============================
   スマホ最適化
=============================== */
@media (max-width: 480px) {
  .index-btn-area .luxury-btn-strong {
    max-width: 100%;
  }

.history-title {
  margin-top: 50px; /* ← 40〜50px がベスト */
}

  .index-sub-btn-area .luxury-btn {
    max-width: 100%;
  }
}