:root {
    --background-color-light: #f0f2f5;
    --text-color-light: #333;
    --card-background-light: #ffffff;
    --button-background-light: #4CAF50;
    --button-text-light: #ffffff;
    --shadow-light: 0 4px 15px rgba(0, 0, 0, 0.1);

    --background-color-dark: #121212;
    --text-color-dark: #e0e0e0;
    --card-background-dark: #1e1e1e;
    --button-background-dark: #4a90e2;
    --button-text-dark: #ffffff;
    --shadow-dark: 0 6px 20px rgba(0, 0, 0, 0.4);
}

body {
    background-color: var(--background-color-light);
    color: var(--text-color-light);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 500px;
    text-align: center;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    margin: 0;
}

.theme-switcher {
    display: flex;
    align-items: center;
}

.lotto-card {
    background-color: var(--card-background-light);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-light);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
    background-color: #3498db; /* Default color, will be updated */
}

#generate-btn {
    background-color: var(--button-background-light);
    color: var(--button-text-light);
    border: none;
    border-radius: 8px;
    padding: 15px 30px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

#generate-btn:hover {
    transform: translateY(-2px);
}

/* Dark Mode Styles */
body.dark-mode {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode .lotto-card {
    background-color: var(--card-background-dark);
    box-shadow: var(--shadow-dark);
}

body.dark-mode #generate-btn {
    background-color: var(--button-background-dark);
    color: var(--button-text-dark);
}