:root {
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --background-color: #f0f0f0;
    --text-color: #333;
    --border-color: #ddd;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --font-family: Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

h1, h2 {
    margin-bottom: 1rem;
}

button {
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    opacity: 0.9;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}