* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    position: relative;
    padding-top: 10px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.logo-container {
    position: absolute;
    top: 15px;
    left: 15px;
    z-index: 100;
}

.logo-link {
    display: block;
}

.site-logo {
    height: 60px;
    width: auto;
    transition: transform 0.3s ease;
}

.site-logo:hover {
    transform: scale(1.05);
}

.main-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    padding: 15px 0;
    margin-bottom: 30px;
    text-align: center;
    padding-top: 30px;
}

h1 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.8em;
}

.search-form {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
}

input[type="text"] {
    padding: 8px 15px;
    width: 300px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 8px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

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

.book-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.book-item {
    background-color: white;
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.book-info h2 {
    margin-bottom: 10px;
    font-size: 1.2em;
}

.book-info p {
    color: #666;
    margin-bottom: 5px;
}

.download-link {
    display: inline-block;
    padding: 8px 20px;
    background-color: #28a745;
    color: white;
    text-decoration: none;
    border-radius: 4px;
}

.download-link:hover {
    background-color: #218838;
}

.sort-options {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.sort-link {
    text-decoration: none;
    color: #666;
    padding: 5px 10px;
    border-radius: 4px;
}

.sort-link:hover {
    color: #007bff;
}

.sort-link.active {
    color: #007bff;
    font-weight: bold;
}

.meta-info {
    font-size: 0.5em;
    color: #888 !important;
    margin-top: 5px;
}

.book-info {
    flex: 1;
}

.download-btn {
    margin-left: 20px;
}

.main-footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px 0;
    color: #666;
    font-size: 0.9em;
    border-top: 1px solid #eee;
    background-color: #f8f9fa;
}

.main-footer p {
    margin-bottom: 10px;
}

.beian-info {
    font-size: 0.85em;
    margin-top: 15px;
}

.beian-info a {
    color: #666;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.beian-info img {
    height: 14px;
    margin-right: 5px;
}

.beian-info a:hover {
    color: #007bff;
    text-decoration: underline;
}

.admin-link {
    margin-top: 15px;
    font-size: 0.85em;
}

.admin-link a {
    color: #6c757d;
    text-decoration: none;
}

.admin-link a:hover {
    color: #007bff;
    text-decoration: underline;
}