:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5a623;
    --background-color: #f0f2f5;
    --text-color: #333;
    --white: #fff;
    --container-bg: #fff;
}

body.dark-mode {
    --primary-color: #58a6ff;
    --secondary-color: #f7b733;
    --background-color: #0d1117;
    --text-color: #c9d1d9;
    --container-bg: #161b22;
}

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

.container {
    position: relative;
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease;
}

.theme-toggle-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    padding: 8px 12px;
    font-size: 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.theme-toggle-btn:hover {
    opacity: 0.8;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 30px;
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.lotto-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--white);
    background-color: var(--secondary-color);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.generate-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.generate-btn:hover {
    background-color: #357ABD;
}