/* Navigation */
.nav {
    background-color: #0a192f;
    overflow: hidden;
    text-align: right;
}

.nav a {
    float: right;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}

.nav a:hover {
    background-color: #ddd;
    color: black;
}

/* Footer */
footer {
    background-color: #0a192f;
    color: white;
    padding: 20px 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}

.footer-content {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Main Content */
.main-content {
    display: flex;
    max-width: 1200px;
    margin: 40px auto;
    gap: 40px;
}

.left-column {
    flex: 1;
    padding: 20px;
}

.right-column {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Buttons */
.button-container {
    margin-top: 30px;
    display: flex;
    gap: 20px;
}

.btn {
    padding: 10px 20px;
    background-color: #1a237e;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.btn:hover {
    background-color: #283593;
}

/* Images */
.book-image {
    max-width: 100%;
    height: auto;
}

/* Banner */
.banner {
    width: 100%;
    height: 200px;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
}

/* Headings */
h1 {
    text-align: left;
    font-size: 2.5em;
    margin: 40px 0;
}

.centered-heading {
    text-align: center;
}

/* Columns Layout */
.columns {
    display: flex;
    justify-content: space-around;
    margin: 20px;
}

.column {
    flex: 1;
    margin: 0 15px;
    text-align: center;
}

.column img {
    width: 150px;
    height: 150px;
    margin-bottom: 20px;
}