:root {
    --bg-color: #f7f7f7;
    --container-bg: white;
    --text-color: #333;
    --number-bg: #eee;
    --number-color: #555;
    --button-bg: #007aff;
    --button-hover-bg: #0056b3;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1c1c1e;
    --container-bg: #2c2c2e;
    --text-color: #f2f2f7;
    --number-bg: #3a3a3c;
    --number-color: #f2f2f7;
    --button-bg: #0a84ff;
    --button-hover-bg: #005fcc;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    transition: background-color 0.3s, color 0.3s;
}
.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 25px var(--shadow-color);
    transition: background-color 0.3s;
}
h1 {
    color: var(--text-color);
    margin-bottom: 30px;
}
.numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}
.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--number-color);
    transition: background-color 0.3s, color 0.3s;
}
button {
    padding: 15px 30px;
    font-size: 18px;
    color: white;
    background-color: var(--button-bg);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}
button:hover {
    background-color: var(--button-hover-bg);
}

.theme-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-switcher input {
    display: none;
}

.theme-switcher label {
    cursor: pointer;
    font-size: 12px;
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 20px;
    background-color: var(--container-bg);
    box-shadow: 0 2px 5px var(--shadow-color);
}