:root {
    --background-color: #f4f4f4;
    --text-color: #333;
    --container-bg: #fff;
    --button-bg: #4CAF50;
    --button-hover-bg: #45a049;
    --number-bg: #007bff;
    --number-color: #fff;
    --border-color: #ddd;
}

body.dark-mode {
    --background-color: #333;
    --text-color: #f4f4f4;
    --container-bg: #444;
    --button-bg: #0056b3;
    --button-hover-bg: #004494;
    --number-bg: #007bff; /* Can be changed for dark mode if desired */
    --number-color: #fff;
    --border-color: #555;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 30px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
}

h1 {
    color: var(--text-color);
    margin-bottom: 20px;
    transition: color 0.3s;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.number-circle {
    width: 50px;
    height: 50px;
    background-color: var(--number-bg);
    color: var(--number-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s, color 0.3s;
}

button {
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s;
    margin: 5px; /* Add some margin for the theme toggle button */
}

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

.theme-toggle {
    margin-bottom: 20px;
}