@media (max-width: 768px) {
    .book-content {
        flex-direction: column;
    }
}

body {
    background-color: rgb(147, 207, 205);
    font-family: 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #ffffff;
    padding: 25px;
    /* Increased padding for better spacing */
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    /* Slightly darker shadow for better contrast */
    border-radius: 10px;
    /* Slightly larger border-radius for smoother corners */
}

.container h2 {
    font-family: "Shippori Mincho B1", serif;
    font-weight: 700;
    /* Increased weight for better emphasis */
    font-size: 28px;
    /* Larger font size for better visibility */
    color: #333;
    text-align: center;
    margin-bottom: 20px;
    /* More spacing below the title */
}

.container h4 {
    font-family: "Shippori Mincho B1", serif;
    font-size: 14px;
    color: #333;
    text-align: center;
}

.book-content {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    /* More spacing below book content */
}

.book-cover {
    flex: 1;
    text-align: center;
    margin-right: 20px;
    margin-top: 10px;
}

.book-cover img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    /* Slightly larger border-radius for images */
    border: 1px solid rgba(30, 30, 30, 0.334);
    /* 細く薄いグレーの線を追加 */
}

.book-description {
    flex: 2;
}

.book-description p {
    line-height: 1.8;
    /* Slightly increased line height for better readability */
    font-size: 16px;
    /* Increased font size for better readability */
    color: #444;
    overflow-wrap: break-word;
}

.purchase-links {
    text-align: center;
    margin: 40px 0;
    /* Increased spacing around the purchase links */
}

#sectionbtn a {
    text-decoration: none;
    color: #474545;
    background-color: rgb(147, 207, 205);
    padding: 12px 25px;
    /* Slightly increased padding for better button appearance */
    border-radius: 5px;
    font-size: 18px;
    /* Larger font size for the buttons */
    margin: 0 15px;
    /* More space between buttons */
    display: inline-block;
    transition: background-color 0.3s;
}

.purchase-links a:hover {
    background-color: #45a049;
}

.author-info {
    padding: 20px;
    /* Increased padding for better spacing */
    background-color: #f0f8e2;
    border-left: 5px solid #4caf50;
    /* Slightly thicker border for emphasis */
    border-radius: 8px;
    /* Slightly larger border-radius for smoother corners */
    margin: 20px auto;
    max-width: 800px;
    text-align: center;
}

.author-info h4 {
    text-align: left;
    margin-top: 0;
    margin-bottom: 15px;
    /* Increased space below the heading */
    font-size: 16px;
    /* Larger font size for better readability */
    color: #333;
}

.author-info p {
    text-align: left;
    line-height: 1.8;
    /* Increased line height for better readability */
    font-size: 14px;
    /* Increased font size for better readability */
    color: #555;
}

.author-info .gray-text {
    color: #b1a9a9;
}

.center-text {
    text-align: center;
    font-size: 16px;
    /* Slightly larger font size for better readability */
    color: #292929;
}

.author-info .small-link {
    font-size: 12px;
    /* Slightly larger link size for readability */
}

/*ライナーノーツ*/
.glossary-container {
    margin: 40px auto;
    max-width: 800px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.glossary-container h3 {
    font-family: "Shippori Mincho B1", serif;
    font-weight: 700;
    font-size: 24px;
    color: #333;
    text-align: center;
    margin-bottom: 20px;
}
.glossary-container h5 {
    font-family: "Shippori Mincho B1", serif;
    font-weight: 700;
    font-size: 12px;
    color: #333;
    text-align: center;
    margin-bottom: 20px;
}

.glossary-item {
    margin-bottom: 20px;
}

.glossary-item h4 {
    font-size: 18px;
    color: #007BFF;
    margin-bottom: 10px;
}

.glossary-item p {
    font-size: 16px;
    line-height: 1.6;
    color: #555;
}



/*retun to top:*/
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #4caf50;
    color: #ffffff;
    padding: 10px 15px;
    border-radius: 5px;
    text-align: center;
    text-decoration: none;
    font-size: 14px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, opacity 0.3s;
    z-index: 1000;
    /* 他の要素より前面に表示 */
    opacity: 0;
    /* 初期状態では非表示 */
    visibility: hidden;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* Q and A */
.chat-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    /* コンテナをはみ出さないようにするために追加 */
}

.bubble {
    padding: 10px 20px;
    border-radius: 20px;
    margin-bottom: 10px;
    max-width: 100%;
    /* 吹き出しがコンテナをはみ出さないように調整 */
    line-height: 1.4;
    word-wrap: break-word;
    /* 長い単語がはみ出さないようにする */
}

.bubble p {
    display: flex;
    align-items: center;
    /* 画像とテキストを縦方向に中央揃え */
    margin: 0;
}

.bubble img {
    margin-right: 10px;
    /* 画像とテキストの間にスペースを追加 */
    vertical-align: middle;
    /* 画像の垂直方向をテキストと揃える */
    height: 20px;
    /* 画像の高さを適切なサイズに調整 */
}

.left {
    background-color: #e0f7fa;
    text-align: left;
    float: left;
    clear: both;
}

.right {
    background-color: #c8e6c9;
    text-align: right;
    float: right;
    clear: both;
}

.question .bubble {
    margin-right: auto;
}

.answer .bubble {
    margin-left: auto;
}

p {
    margin: 0;
}

.chat-container h3 {
    font-family: "Shippori Mincho B1", serif;
    font-weight: 700;
    /* Increased weight for better emphasis */
    font-size: 20px;
    /* Larger font size for better visibility */
    color: #333;
    text-align: center;
    margin-bottom: 20px;
    /* More spacing below the title */
}

/*フロートメニュー*/
.floating-menu {
    position: fixed;
    top: 10%;
    right: 20px;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 5px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    width: 40px;
    height: 40px;
    overflow: hidden;
    transition: width 0.3s, height 0.3s;
}

.floating-menu:hover,
.floating-menu.expanded {
    width: 150px;
    height: auto;
    padding: 10px;
}

.floating-menu .menu-icon {
    font-size: 24px;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
}

.floating-menu ul {
    list-style: none;
    padding: 0;
    margin: 10px 0 0 0;
    display: none;
}

.floating-menu.expanded ul {
    display: block;
}

.floating-menu ul li {
    margin-bottom: 10px;
}

.floating-menu ul li a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

.floating-menu ul li a:hover {
    color: #007BFF;
}


html {
    scroll-behavior: smooth;
}