* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    background-color: #f4f4f9;
    color: #333;
    line-height: 1.6;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

header {
    padding: 2rem 0;
    text-align: center;
    background-color: #333;
    color: #fff;
}

header h1 {
    margin-bottom: 0.5rem;
}

header button {
    padding: 0.5rem 1rem;
    border: none;
    background-color: #0066cc;
    color: #fff;
    cursor: pointer;
    border-radius: 0.5rem;
    transition: background-color 0.3s ease;
}

header button:hover {
    background-color: #004d99;
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

section {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

section#image img {
    width: 100%;
    border-radius: 0.5rem;
}

section#links {
    text-align: center;
}

section#links a {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: #0066cc;
    color: #fff;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: background-color 0.3s ease;
}

section#links a:hover {
    background-color: #004d99;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

.dark-mode {
    background-color: #222;
    color: #ddd;
}

.dark-mode header {
    background-color: #444;
}

.dark-mode footer {
    background-color: #444;
}