* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-color: #f2f2f2;
    --text-color: #333;
    --header-bg: #333;
    --header-text: #fff;
    --btn-bg: #333;
    --btn-text: #fff;
    --btn-hover-bg: #444;
    --lotto-bg: #fff;
    --lotto-shadow: rgba(0, 0, 0, 0.1);
    --footer-bg: #333;
    --footer-text: #fff;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f2f2f2;
    --header-bg: #222;
    --header-text: #f2f2f2;
    --btn-bg: #f2f2f2;
    --btn-text: #333;
    --btn-hover-bg: #ddd;
    --lotto-bg: #444;
    --lotto-shadow: rgba(255, 255, 255, 0.1);
    --footer-bg: #222;
    --footer-text: #f2f2f2;
}


body {
    font-family: sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem;
    text-align: center;
    position: relative;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.lotto-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
}

.lotto-numbers {
    display: flex;
    gap: 1rem;
}

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

#generate-btn {
    display: block;
    margin: 0 auto;
    padding: 1rem 2rem;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: 5px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

#generate-btn:hover {
    background-color: var(--btn-hover-bg);
}

footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 1rem;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
}

#theme-selector-container {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 0.5rem;
}

#theme-selector-container button {
    background: none;
    border: 1px solid var(--header-text);
    color: var(--header-text);
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 5px;
}

#theme-selector-container button.active {
    background-color: var(--header-text);
    color: var(--header-bg);
}