body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f7f6;
    color: #333;
}

header {
    background: #2f7f75;
    color: white;
    text-align: center;
    padding: 2rem;
    position: relative;
}

.top-left-book {
    position: absolute;
    top: 15px;
    left: 15px;
}

.top-left-book img {
    width: 70px;
    border-radius: 6px;
}

nav {
    background: #1e5750;
    padding: 1rem;
    text-align: center;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

section {
    padding: 3rem 2rem;
    max-width: 900px;
    margin: auto;
}

input {
    padding: 10px;
    margin: 5px;
    width: 200px;
}

button {
    padding: 10px 20px;
    background: #2f7f75;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #245e57;
}

footer {
    background: #1e5750;
    color: white;
    text-align: center;
    padding: 1rem;
}