/* 共通リセット */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', sans-serif; }

/* 年齢確認ページ */
.age-body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(135deg, #f0faff, #e6f0ff);
  color: #222;
}

.age-gate h1 { font-size: 32px; margin-bottom: 30px; text-align: center; }
.btn-group { display: flex; justify-content: center; gap: 20px; }
.btn {
  padding: 12px 25px;
  border: 2px solid #00aaff;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(5px);
  border-radius: 12px;
  cursor: pointer;
  font-size: 18px;
  transition: 0.3s;
}
.btn:hover { background: #00aaff; color: #fff; }

/* ヘッダー */
header {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 40px;
  background: rgba(255,255,255,0.5);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(200,200,200,0.3);
  z-index: 100;
}
header h1 {
  font-size: 32px;
  background: linear-gradient(90deg, #00aaff, #00ffcc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
header nav a {
  margin-left: 20px;
  color: #0077cc;
  text-decoration: none;
  font-weight: 600;
}

/* メインコンテナ */
.container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
  padding: 40px;
}

/* カード */
.card {
  background: rgba(255,255,255,0.6);
  border-radius: 20px;
  box-shadow: 0 12px 25px rgba(0,0,0,0.08);
  backdrop-filter: blur(15px);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.card:hover { transform: translateY(-8px) scale(1.05); box-shadow: 0 20px 40px rgba(0,0,0,0.12); }

.thumb {
  width: 100%;
  height: 160px;
  background: linear-gradient(135deg, #a0e9ff, #f0faff);
}

.card h2 { font-size: 20px; margin: 15px; color: #222; }
.card p { font-size: 14px; margin: 0 15px 15px; color: #555; }