:root {
    --bg-color: #f7f7f7;
    --container-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-color: #4CAF50;
    --accent-hover: #45a049;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body.dark {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #aaaaaa;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

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

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: 2px solid var(--text-secondary);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

.theme-toggle:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--shadow-color), 0 6px 6px var(--shadow-color);
    max-width: 500px;
    width: 90%;
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    color: var(--text-primary);
    font-size: 2.5em;
    margin-bottom: 10px;
}

p {
    color: var(--text-secondary);
    font-size: 1.2em;
    margin-bottom: 30px;
}

#generate {
    background-color: var(--accent-color);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1.2em;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

#generate:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
    transform: translateY(-2px);
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}