/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background 0.3s, color 0.3s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    text-align: center;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background: #2c3e50;
    color: white;
    padding: 2rem 0;
}

main {
    padding: 50px 20px;
}

button {
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    margin-top: 20px;
}

button:hover {
    background-color: #2980b9;
}

/* Dark Mode Styles */
body.dark-theme {
    background-color: #1a1a1a;
    color: #f4f4f4;
}

body.dark-theme header {
    background: #000;
}