body {
      margin: 0;
      padding: 0;
      background-image: url('../images/background.jpg');
      background-size: cover;
      background-position: center;
      font-family: 'Yu Gothic', 'Hiragino Kaku Gothic ProN', 'Segoe UI', 'Helvetica Neue', sans-serif;
      color: #f0f0f0;
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      box-sizing: border-box;
      padding-top: 30px;
    }
    .logo {
      max-width: 140px;
      margin-bottom: 20px;
    }
    h1 {
      font-size: 1.8rem;
      margin-bottom: 15px;
      text-shadow: 1px 1px 2px #222;
    }
    p {
      font-size: 1.1rem;
      margin-bottom: 30px;
      text-shadow: 1px 1px 1px #222;
    }
    .button {
      font-size: 1.2rem;
      padding: 10px 30px;
      background-color: rgba(255, 255, 255, 0.9);
      color: #003366;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      font-weight: bold;
      text-decoration: none;
      box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
      margin: 10px;
      display: inline-block;
    }
    .button:hover {
      background-color: #e0e0e0;
    }
    .books-section {
      margin-top: 60px;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.5);
      border-radius: 10px;
      max-width: 900px;
    }
    .books-section h2 {
      margin-bottom: 20px;
      font-size: 1.5rem;
      color: #ffd700;
    }
    .book-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-top: 20px;
    }
    .book-item {
      width: 140px;
      position: relative;
    }
    .book-item img {
      width: 100%;
      border-radius: 8px;
      margin-bottom: 8px;
      box-shadow: 2px 2px 5px rgba(0,0,0,0.4);
    }
    .book-item span {
      position: absolute;
      top: 8px;
      left: 8px;
      background-color: #ffd700;
      color: #003366;
      padding: 3px 6px;
      font-size: 0.7rem;
      font-weight: bold;
      border-radius: 5px;
    }
    .book-item p {
      font-size: 0.9rem;
      color: #fff;
      margin-top: 4px;
    }
    footer {
      font-size: 0.7rem;
      color: #bbb;
      margin-top: 40px;
      padding: 20px;
    }
    @media (max-width: 600px) {
      .button {
        width: 80%;
        font-size: 1rem;
      }
    }