html {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f9f9f9;
    color: #333;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 40px;
}

footer {
    margin-top: 60px;
    font-size: 0.85rem;
    color: #aaa;
}

.home-button {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 12px 20px;
    background: #28a745;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease, transform 0.2s ease;
}

.home-button:hover {
    background: #218838;
    transform: translateY(-2px);
}
.container {
    display: flex;
    gap: 20px;
}

.sidebar {
    width: 220px;
    background-color: #f0f0f0;
    padding: 30px 20px;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.05);
    min-height: 100vh;
}

.sidebar h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    text-align: left;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    text-align: left;
}

.sidebar li {
    margin: 10px 0;
}

.sidebar a {
    display: inline-block;
    padding: 10px 16px;
    background: #c9c9c9;
    color: #000000;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.95rem;
    transition: background 0.3s ease;
}

.sidebar a:hover {
    background: #8f8f8f;
}

.chapter-link {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    text-decoration: none;
    color: #333;
}

.chapter-link img {
    margin-right: 10px;
}

.content {
    flex: 1;
    padding: 20px;
}