:root {
    --bg-color: #f0f0f0;
    --container-bg: white;
    --text-color: #333;
    --ball-bg: #eee;
    --btn-bg: #4CAF50;
    --btn-text: white;
    --shadow: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #f0f0f0;
    --ball-bg: #333;
    --shadow: rgba(255, 255, 255, 0.05);
}

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

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

.theme-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
}

.number {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
    background-color: var(--ball-bg);
    margin: 0 0.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    transition: background-color 0.3s;
}

#generate-btn {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: 5px;
    cursor: pointer;
}