:root {
    --bg-color-light: #f0f0f0;
    --container-bg-light: white;
    --text-color-light: #333;
    --number-bg-light: #eee;
    --btn-bg-light: #4CAF50;
    --btn-hover-light: #45a049;

    --bg-color-dark: #222;
    --container-bg-dark: #333;
    --text-color-dark: #f0f0f0;
    --number-bg-dark: #555;
    --btn-bg-dark: #555;
    --btn-hover-dark: #666;
}

body {
    font-family: sans-serif;
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    --bg-color-light: var(--bg-color-dark);
    --container-bg-light: var(--container-bg-dark);
    --text-color-light: var(--text-color-dark);
    --number-bg-light: var(--number-bg-dark);
    --btn-bg-light: var(--btn-bg-dark);
    --btn-hover-light: var(--btn-hover-dark);
}

.container {
    background-color: var(--container-bg-light);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    position: relative;
}

.toggle-container {
    position: absolute;
    top: 15px;
    right: 15px;
}

.toggle-input {
    display: none;
}

.toggle-label {
    display: block;
    width: 50px;
    height: 26px;
    background-color: #ccc;
    border-radius: 13px;
    cursor: pointer;
    position: relative;
    transition: background-color 0.3s;
}

.toggle-label::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background-color: white;
    top: 2px;
    left: 2px;
    transition: transform 0.3s;
}

.toggle-input:checked + .toggle-label {
    background-color: #4CAF50;
}

.toggle-input:checked + .toggle-label::after {
    transform: translateX(24px);
}

h1 {
    margin-top: 0;
    color: var(--text-color-light);
}

.numbers-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--number-bg-light);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--text-color-light);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.generate-btn {
    background-color: var(--btn-bg-light);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 18px;
    transition: background-color 0.3s;
}

.generate-btn:hover {
    background-color: var(--btn-hover-light);
}