:root {
    --bg-color: #f4f4f4;
    --text-color: #333;
    --container-bg: #fff;
    --button-bg: #4CAF50;
    --button-hover-bg: #45a049;
    --lotto-number-bg: #007bff;
    --h1-color: #4CAF50;
}

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

body.dark-mode {
    --bg-color: #333;
    --text-color: #f4f4f4;
    --container-bg: #424242;
    --button-bg: #5cb85c;
    --button-hover-bg: #4cae4c;
    --lotto-number-bg: #0275d8;
    --h1-color: #5cb85c;
}

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    position: relative;
}

.theme-toggle-button {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-color);
}

h1 {
    color: var(--h1-color);
    margin-bottom: 20px;
}

.numbers-display {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    min-height: 80px; /* To prevent layout shift when numbers appear */
    align-items: center;
}

.number-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--lotto-number-bg);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    animation: bounceIn 0.5s ease-out;
}

@keyframes bounceIn {
    0% {
        transform: scale(0.3);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
        opacity: 1;
    }
    100% {
        transform: scale(1);
    }
}

button#draw-button {
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button#draw-button:hover {
    background-color: var(--button-hover-bg);
}