:root {
    --bg-color: #f0f0f0;
    --text-color: #222;
    --number-bg: #fff;
    --number-text: #222;
    --button-bg: #4CAF50;
    --button-text: #fff;
}

[data-theme="dark"] {
    --bg-color: #1e1e1e;
    --text-color: #f0f0f0;
    --number-bg: #333;
    --number-text: #f0f0f0;
    --button-bg: #4CAF50;
    --button-text: #fff;
}

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;
}

.numbers {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}

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

button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg);
    color: var(--button-text);
    font-size: 1em;
    cursor: pointer;
}

#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
    background-color: var(--number-bg);
    color: var(--text-color);
    font-size: 1.2em;
}