body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body.light-theme {
    background-color: #ffffff;
    color: #333333;
}

body.dark-theme {
    background-color: #1a1a1a;
    color: #ffffff;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: #f8f9fa;
    border-bottom: 1px solid #dee2e6;
}

body.dark-theme header {
    background-color: #2d2d2d;
    border-bottom-color: #444;
}

nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 1rem;
}

nav a {
    text-decoration: none;
    color: #007bff;
}

body.dark-theme nav a {
    color: #4da6ff;
}

.theme-toggle {
    background: none;
    border: 1px solid #ddd;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
}

body.dark-theme .theme-toggle {
    border-color: #555;
    color: #fff;
    background-color: #444;
}

main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    border-top: 1px solid #dee2e6;
}

body.dark-theme footer {
    border-top-color: #444;
    background-color: #2d2d2d;
}
.contact-button {
    background-color: #007bff;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

body.dark-theme .contact-button {
    background-color: #0056b3;
}