body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* 上寄せに変更 */
    min-height: 100vh;
    padding-top: 20px; /* 上部に余白を追加 */
}

.container {
    background-color: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 80%;
    max-width: 800px;
}

h1 {
    color: #0056b3;
    text-align: center;
    margin-bottom: 20px;
}

.search-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-form input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.search-form button {
    padding: 10px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.search-form button:hover {
    background-color: #0056b3;
}

.results-container {
    margin-top: 20px;
}

.book-card {
    background-color: #e9f5ff;
    border: 1px solid #b3d7ff;
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 10px;
}

.book-card h2 {
    margin-top: 0;
    color: #004085;
}

.book-card p {
    margin: 5px 0;
}

.error-message {
    color: red;
    background-color: #ffebeb;
    border: 1px solid #ffc0c0;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
    text-align: center;
}

#loading {
    text-align: center;
    padding: 10px;
    color: #007bff;
}