/* 全体共通 */
body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: repeating-linear-gradient(
    45deg,
    #eaf6ff,
    #eaf6ff 60px,
    #ffffff 60px,
    #ffffff 120px
  );
  background-attachment: fixed;
  color: #333;
}

/* 共通ヘッダー */
.header {
  text-align: center;
  position: relative;
  z-index: 100;
  margin-top: 20px; /* 上の余白は背景が見える */
}

.header-container {
  background-color: #80b3ff; /* 青い帯部分 */
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 1rem; /* ここを20px→10pxに変更 */
}

.header h1 {
  margin: 0;
  color: white;
  font-size: 2rem;
  font-weight: bold;
}

/* ハンバーガーメニュー */
.hamburger {
  font-size: 1.5rem;
  background: none;
  border: none;
  color: white;
  cursor: pointer;
}

.nav-menu {
  display: none;
}

.nav-menu.open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  right: 0;
  background: #80b3ff;
  width: 200px;
}

.nav-menu a {
  padding: 0.8rem 1rem;
  text-decoration: none;
  color: white;
  border-bottom: 1px solid rgba(255,255,255,0.3);
}

.nav-menu a:last-child {
  border-bottom: none;
}

/* ハンバーガーメニューリンクホバー */
.nav-menu a:hover {
  background-color: #6699ff; /* 濃いめの青に変更 */
  transition: 0.2s;
}


/* タブボタン共通 */
.tab-button {
  color: #3366cc;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border: 2px solid #80b3ff;
  border-radius: 25px;
  background: white;
  cursor: pointer;
  text-align: center;
  margin: 0.5rem;
  display: inline-block;
}

/* ポスター */
/* #poster img {
  display: block;
  max-width: 600px;
  width: 90%;
  margin: 2rem auto;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(100,150,255,0.5);
} */

.poster img {
  display: block;
  max-width: 600px; /* 小さめに変更して調整 */
  width: 90%;
  margin: 1rem auto;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(100,150,255,0.5);
}


/* フッター */
.footer {
  background: #80b3ff;
  text-align: center;
  padding: 0.3rem;
  margin-top: 3rem;
  position: static;
}

.footer p {
  color: white;
  margin: 0;
  font-weight: bold;
}

/* 上に戻るボタン */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background-color: #80b3ff;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  opacity: 0.7;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
  display: none; /* 初期非表示 */
}

#backToTop:hover {
  opacity: 1;
  transform: translateY(-2px);
}


/* Lightbox
#lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 2000;
}

#lightbox.show {
  display: flex;
}

#lightbox-img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(255,255,255,0.4);
  cursor: pointer;
} */