:root {
    --background-color: #f0f2f5;
    --container-bg-color: #ffffff;
    --text-color: #333;
    --number-bg-color: #eee;
    --number-text-color: #555;
    --lotto-ball-color: #eee;
    --lotto-ball-text-color: #555;
    --button-gradient-start: #6a11cb;
    --button-gradient-end: #2575fc;
    --button-text-color: #fff;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239C92AC' fill-opacity='0.1'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H0V5z'/%3E%3C/g%3E%3C/svg%3E");
    transition: background-color 0.3s ease;
}

body.dark-mode {
    --background-color: #1a1a1a;
    --container-bg-color: #2c2c2c;
    --text-color: #f0f0f0;
    --number-bg-color: #444;
    --number-text-color: #f0f0f0;
    --lotto-ball-color: #444;
    --lotto-ball-text-color: #f0f0f0;
}

.theme-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
}

#theme-toggle {
    margin-left: 10px;
}

.container {
    text-align: center;
    padding: 40px;
    background-color: var(--container-bg-color);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}

h1 {
    margin-bottom: 30px;
    font-size: 2.5em;
    color: var(--text-color);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    margin: 0 10px;
    background-color: var(--number-bg-color);
    border-radius: 50%;
    font-size: 1.8em;
    font-weight: bold;
    color: var(--number-text-color);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#generate {
    padding: 15px 40px;
    font-size: 1.2em;
    color: var(--button-text-color);
    background: linear-gradient(45deg, var(--button-gradient-start), var(--button-gradient-end));
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

#generate:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2em;
    }

    .lotto-numbers {
        flex-wrap: wrap;
    }

    .number {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
        margin: 5px;
    }

    #generate {
        padding: 12px 30px;
        font-size: 1em;
    }
}