:root {
    --background-color: #f0f0f0;
    --text-color: #333;
    --container-bg-color: white;
    --button-bg-color: #4CAF50;
    --button-hover-bg-color: #45a049;
    --number-bg-color: #6a0dad; /* A default color for numbers */
}

body.dark-mode {
    --background-color: #222;
    --text-color: #eee;
    --container-bg-color: #333;
    --button-bg-color: #6a0dad;
    --button-hover-bg-color: #5a0cae;
    --number-bg-color: #4CAF50; /* A different color for numbers in dark mode */
}

body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column; /* Changed to column to accommodate theme switch */
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    margin: 0; /* Remove default body margin */
}

.container {
    text-align: center;
    background-color: var(--container-bg-color);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, box-shadow 0.3s;
    position: relative; /* For positioning theme switch */
}

.theme-switch {
    position: absolute;
    top: 10px;
    right: 10px;
}

#theme-toggle {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

#theme-toggle:hover {
    background-color: var(--button-hover-bg-color);
}

h1 {
    margin-bottom: 1rem;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    background-color: var(--number-bg-color);
    transition: background-color 0.3s;
}

#generate-btn {
    padding: 0.5rem 1rem;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

#generate-btn:hover {
    background-color: var(--button-hover-bg-color);
}