:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --number-bg: #eee;
    --number-text: #333;
    --btn-bg: #fff;
    --btn-text: #333;
    --btn-border: #ccc;
}

[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --text-color: #eee;
    --number-bg: #16213e;
    --number-text: #eee;
    --btn-bg: #0f3460;
    --btn-text: #eee;
    --btn-border: #0f3460;
}

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;
    margin-bottom: 20px;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    color: var(--number-text);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    margin: 0 10px;
    transition: background-color 0.3s, color 0.3s;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    cursor: pointer;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: 1px solid var(--btn-border);
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

button:hover {
    opacity: 0.8;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
}