:root {
    --primary-color: #4a90e2;
    --secondary-color: #50e3c2;
    --background-color: #f0f2f5;
    --text-color: #333;
    --white: #fff;
}

body {
    font-family: 'Helvetica Neue', 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(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1), 0 6px 6px rgba(0,0,0,0.15);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

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

.btn {
    color: var(--white);
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

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

#generate-btn:hover {
    box-shadow: 0 6px 12px rgba(74, 144, 226, 0.4);
}

#theme-toggle-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 10px 15px;
    font-size: 1em;
    background-color: var(--secondary-color);
}

#theme-toggle-btn:hover {
    box-shadow: 0 6px 12px rgba(80, 227, 194, 0.4);
}