:root {
    --primary-color: #3498db;
    --background-color: #f4f7f6;
    --text-color: #333;
    --header-bg: #2c3e50;
    --header-text: #ecf0f1;
    --card-bg: #fff;
    --border-color: #ddd;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
}

.main-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.main-header a {
    color: var(--header-text);
    text-decoration: none;
    font-weight: bold;
}

.logo a {
    font-size: 1.5rem;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.main-nav li {
    margin-left: 20px;
}

.search-box input {
    border: none;
    padding: 8px 12px;
    border-radius: 20px;
    outline: none;
}

.search-box button {
    background-color: var(--primary-color);
    color: var(--header-text);
    border: none;
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
}

.main-content {
    max-width: 800px;
    margin: 20px auto;
    padding: 0 20px;
    font-size: 1.2em;
}

.book-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    padding: 20px 0;
}
.book-info img {
    max-width: 300px;
}
.chapter-navigation a{
    padding: 10px;
}
.book-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: transform 0.2s ease-in-out;
}

.book-card a{
    text-decoration: none;
}

.book-card:hover {
    transform: translateY(-5px);
}

.book-card img {
    width: 100%;
    height: auto;
    display: block;
}

.book-card .book-title {
    padding: 10px;
    font-size: 1rem;
    color: var(--text-color);
}

.main-footer {
    background-color: var(--header-bg);
    color: var(--header-text);
    text-align: center;
    padding: 20px 0;
}

/* Thêm đoạn này vào cuối file style.css */
.chapter-list-container {
    max-height: 400px; /* Điều chỉnh chiều cao tối đa phù hợp */
    overflow-y: auto; /* Cho phép cuộn dọc */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    background-color: var(--card-bg);
}

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

.chapter-list li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.chapter-list li:last-child {
    border-bottom: none;
}

.chapter-list a {
    display: block;
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

.chapter-list a:hover {
    color: var(--primary-color);
}