:root {
    --bg-color: #f0f0f0;
    --container-bg: transparent;
    --text-color: #333;
    --ball-bg: #fff;
    --ball-border: #ccc;
    --btn-bg: #e0e0e0;
    --btn-text: #333;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --ball-bg: #333;
    --ball-border: #555;
    --btn-bg: #444;
    --btn-text: #f0f0f0;
}

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 {
    text-align: center;
}

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

.lotto-numbers {
    display: flex;
    margin: 20px 0;
    justify-content: center;
}

.lotto-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--ball-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 5px;
    font-size: 20px;
    font-weight: bold;
    border: 2px solid var(--ball-border);
    color: var(--text-color);
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

#generator-btn, #theme-btn {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: 1px solid var(--ball-border);
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

#generator-btn:hover, #theme-btn:hover {
    opacity: 0.8;
}