:root {
    --background-color: #f4f4f4;
    --text-color: #333;
    --container-bg: #fff;
    --heading-color: #4CAF50;
    --number-bg: #4CAF50;
    --number-border: #388E3C;
    --button-bg: #007bff;
    --button-hover-bg: #0056b3;
}

body.dark-mode {
    --background-color: #2c2c2c;
    --text-color: #e0e0e0;
    --container-bg: #3c3c3c;
    --heading-color: #81C784;
    --number-bg: #66BB6A;
    --number-border: #43A047;
    --button-bg: #5c6bc0;
    --button-hover-bg: #3f51b5;
}

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

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
    position: relative; /* For positioning the toggle button */
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    padding: 5px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

body.dark-mode .theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}


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

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap; /* Allow numbers to wrap on smaller screens */
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--number-bg);
    color: white;
    font-size: 1.8em;
    font-weight: bold;
    border: 2px solid var(--number-border);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

button {
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    font-size: 1.1em;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

@media (max-width: 600px) {
    .number {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
    }
}