:root {
    --background-color-light: #f0f0f0;
    --text-color-light: #333;
    --container-bg-light: #fff;
    --button-bg-light: #4CAF50;
    --button-text-light: white;
    --input-bg-light: #f9f9f9;
    --input-border-light: #ccc;

    --background-color-dark: #333;
    --text-color-dark: #f0f0f0;
    --container-bg-dark: #444;
    --button-bg-dark: #5cb85c;
    --button-text-dark: white;
    --input-bg-dark: #555;
    --input-border-dark: #777;
}

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

body.dark-mode {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

.container {
    text-align: center;
    background-color: var(--container-bg-light);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin-bottom: 2rem; 
    width: 80%;
    max-width: 800px;
}

body.dark-mode .container {
    background-color: var(--container-bg-dark);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

h1, h2 {
    margin-top: 0;
}

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

.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
}

input,
textarea {
    width: 100%;
    padding: 0.5rem;
    border-radius: 5px;
    border: 1px solid var(--input-border-light);
    background-color: var(--input-bg-light);
    color: var(--text-color-light);
}

body.dark-mode input,
body.dark-mode textarea {
    border: 1px solid var(--input-border-dark);
    background-color: var(--input-bg-dark);
    color: var(--text-color-dark);
}

button {
    background-color: var(--button-bg-light);
    color: var(--button-text-light);
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

button:hover {
    opacity: 0.9;
}

#theme-toggle-btn {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background-color: #ccc;
    color: #333;
}

body.dark-mode #theme-toggle-btn {
    background-color: #555;
    color: #fff;
}