:root {
    --background-color: #f0f0f0;
    --container-background: white;
    --text-color: #333;
    --number-background: #eee;
    --button-background: #4CAF50;
    --button-hover: #45a049;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --background-color: #121212;
    --container-background: #1e1e1e;
    --text-color: #f0f0f0;
    --number-background: #333;
    --button-background: #5a5a5a;
    --button-hover: #6a6a6a;
    --shadow-color: rgba(255, 255, 255, 0.1);
}

body {
    font-family: sans-serif;
    display: flex;
    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;
}

.container {
    position: relative;
    text-align: center;
    background-color: var(--container-background);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: background-color 0.3s;
}

#theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem;
    font-size: 0.8rem;
    border: 1px solid var(--text-color);
    border-radius: 5px;
    background-color: transparent;
    color: var(--text-color);
    cursor: pointer;
}

h1 {
    margin-bottom: 1.5rem;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--number-background);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    font-weight: bold;
    transition: background-color 0.3s;
}

#generator-btn {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    background-color: var(--button-background);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

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