:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --container-bg: #fff;
    --lotto-number-bg: #fff;
    --lotto-number-text: #333;
    --btn-bg: #4CAF50;
    --btn-text: #fff;
    --shadow: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #f0f0f0;
    --container-bg: #1e1e1e;
    --lotto-number-bg: #333;
    --lotto-number-text: #f0f0f0;
    --btn-bg: #388E3C;
    --btn-text: #fff;
    --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);
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px var(--shadow);
}

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

.lotto-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--lotto-number-bg);
    color: var(--lotto-number-text);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    margin: 5px;
    box-shadow: 0 2px 5px var(--shadow);
    transition: background-color 0.3s, color 0.3s;
}

#generate-btn {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border-radius: 5px;
    box-shadow: 0 2px 5px var(--shadow);
    transition: background-color 0.3s;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 8px 15px;
    cursor: pointer;
    border: none;
    border-radius: 20px;
    background-color: var(--text-color);
    color: var(--bg-color);
    font-weight: bold;
    transition: background-color 0.3s, color 0.3s;
}