body {
      font-family: 'Noto Sans JP', sans-serif;
      background: #eef6ec;
      margin: 0;
    }
    header {
      padding: 20px 30px;
    }
    header h1 {
      margin: 0;
      font-size: 26px;
    }
    main {
      padding: 30px;
      max-width: 1200px;
      margin: 0 auto;
    }
    a {
      text-decoration: none;
      color: #004b74;
    }
    a:hover {
      text-decoration: underline;
    }
    #unknown-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 20px;
    }
    .spot-card {
      display: flex;
      flex-direction: row;
      background: #fff;
      border-radius: 10px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
      overflow: hidden;
      transition: transform 0.2s ease;
    }
    .spot-card:hover {
      transform: translateY(-3px);
    }
    .spot-card img {
      width: 300px;
      height: 200px;
      object-fit: cover;
    }
    .spot-card .content {
      flex: 1;
      padding: 15px 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .spot-card h3 {
      margin: 0 0 10px;
      color: #222;
      font-size: 18px;
    }
    .spot-card p {
      color: #555;
      font-size: 14px;
      margin: 4px 0;
    }
    .coords {
      font-size: 12px;
      color: #777;
    }
    .rating {
      color: #ffb400;
      font-size: 16px;
    }
    .buttons {
      margin-top: 10px;
    }
    .btn {
      display: inline-block;
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 13px;
      border: none;
      cursor: pointer;
      margin-right: 6px;
      color: #fff;
    }
    .btn-detail {
      background-color: #ff7b00;
    }
    .btn-fav {
      background-color: #f2c800;
      color: #000;
    }
    .mobile-nav{
      display: none;
    }

.favorite-btn {
  background-color: #ffd700;
  border: none;
  padding: 8px 12px;
  border-radius: 5px;
  cursor: pointer;
  margin-left: 0;
}

.favorite-btn:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

.button-container {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-btn {
  background-color: orange;
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 5px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.detail-btn:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

.detail-btn:hover {
  background: silver;
}
/* ===== サイドバー ===== */
.sidebar {
  width: 250px;
  height: 100vh;
  background-color: #2d3232;
  color: white;
  padding-top: 20px;
  position: fixed;
  top: 0;
  right: -250px;
  transition: right 0.3s ease;
  z-index: 200;
}

.sidebar.open {
  right: 0;
}

.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar ul li a {
  display: block;
  padding: 15px 20px;
  text-decoration: none;
  color: white;
  border-bottom: 1px solid #444;
}

.sidebar ul li a:hover {
  background-color: #45514f;
}

/* ===== メニューボタン (PC表示時) ===== */
.menu-button {
  position: fixed;
  top: 5%;
  right: 20px;
  z-index: 250;
  background-color: gray;
  color: white;
  border: none;
  padding: 10px 15px;
  cursor: pointer;
  border-radius: 4px;
}

.menu-button:hover {
  background-color: rgb(113, 113, 113);
}

/* ===== オーバーレイ背景 ===== */
.overlay-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
  z-index: 150;
}

.overlay-bg.show {
  opacity: 1;
  visibility: visible;
}

.credit-widget {
  position: fixed;
  bottom: 15px;
  right: 15px;
  font-size: 12px;
  color: #fff;
  z-index: 100;
  backdrop-filter: blur(6px);
  background: rgba(0, 0, 0, 0.4);
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  transition: all 0.3s ease;
}

.credit-toggle {
  background: transparent;
  border: none;
  color: #fff;
  font-size: 12px;
  padding: 8px 14px;
  cursor: pointer;
  text-align: left;
  width: 100%;
}

.credit-content {
  display: none;
  padding: 0 14px 10px 14px;
  animation: fadeIn 0.3s ease;
}

.credit-content a {
  color: #aad4ff;
  text-decoration: none;
}

.credit-content a:hover {
  text-decoration: underline;
}

.credit-widget.open .credit-content {
  display: block;
}

@media (max-width: 768px) {
  .menu-button {
    display: none !important;
  }

  /* ===== ヘッダー調整 ===== */
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 10px 14px;
  }

  header h1 {
    font-size: 1.3rem;
    margin: 0;
  }

  .mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex !important;
    justify-content: space-around; 
    align-items: center;
    background-color: #509a91;
    padding: 10px 0;
    border-top: 2px solid #1c6f64;
    z-index: 300;
  }

  .mobile-nav a {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: white;
    font-size: 0.8rem;
    width: 20%; 
  }

  .mobile-nav a img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    display: block;
    margin: 0 auto; 
  }
  
  footer {
    margin-bottom: 60px; 
    text-align: center;
  }
  
  .credit-widget {
    position: fixed;
    bottom: 75px;
    right: 10px;
    z-index: 301;
    font-size: 10px;
  }
}