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

/* Body */
body {
    background: #f5f5f5;
    color: #333;
}

/* Header */
header {
    background: #222;
    color: white;
    padding: 15px;
    text-align: center;
}

nav {
    margin-top: 10px;
}

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

nav a:hover {
    text-decoration: underline;
}

/* Sections */
.section {
    padding: 50px 20px;
    text-align: center;
}

.dark {
    background: #333;
    color: white;
}

/* Button */
button {
    background: #007bff;
    color: white;
    padding: 10px 20px;
    border: none;
    margin-top: 15px;
    cursor: pointer;
    border-radius: 5px;
}

button:hover {
    background: #0056b3;
}

/* Form */
form {
    max-width: 400px;
    margin: auto;
}

form input,
form textarea {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
}

form button {
    width: 100%;
}

/* Footer */
footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 15px;
}

/* Mobile Responsive */
@media (max-width: 600px) {

    nav a {
        display: block;
        margin: 8px 0;
    }

    .section {
        padding: 30px 15px;
    }
}