:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --card-bg-color: #fff;
    --card-border-color: #ddd;
    --button-bg-color: #4CAF50;
    --button-text-color: white;
}

body.dark-mode {
    --bg-color: #333;
    --text-color: #f0f0f0;
    --card-bg-color: #444;
    --card-border-color: #555;
    --button-bg-color: #555;
    --button-text-color: #f0f0f0;
}

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;
}

h1 {
    color: var(--text-color);
}

#generate {
    padding: 10px 20px;
    font-size: 1.2em;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    margin-bottom: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s, transform 0.2s;
}

#generate:hover {
    background-color: #45a049;
    transform: translateY(-2px);
}

.numbers-container {
    display: flex;
    flex-direction: column; /* Stack sets vertically */
    align-items: center; /* Center sets horizontally */
    gap: 20px; /* Space between lotto sets */
    margin-top: 20px;
}

.lotto-set {
    display: flex;
    justify-content: center;
    gap: 10px; /* Space between numbers within a set */
    padding: 10px;
    border: 1px solid var(--card-border-color);
    border-radius: 8px;
    background-color: var(--card-bg-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--card-bg-color);
    border: 2px solid var(--card-border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    color: var(--text-color);
}

/* Theme switcher styles */
.theme-switch-container {
    position: absolute;
    top: 15px;
    right: 15px;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #2196F3;
}

input:checked + .slider:before {
    transform: translateX(26px);
}