:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333;
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --number-bg: #4a90e2;
    --number-text: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #ffffff;
    --primary-color: #bb86fc;
    --primary-hover: #9b6bcc;
    --number-bg: #bb86fc;
    --number-text: #121212;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

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

.container {
    text-align: center;
    padding: 40px;
    border-radius: 20px;
    background-color: var(--container-bg);
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
    position: relative;
}

h1 {
    margin-bottom: 30px;
    color: var(--text-color);
    font-weight: 300;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    margin: 0 10px;
    border-radius: 50%;
    background-color: var(--number-bg);
    color: var(--number-text);
    font-size: 24px;
    font-weight: 500;
    box-shadow: 0 4px 10px var(--shadow-color);
    transition: transform 0.3s ease, background-color 0.3s, color 0.3s;
}

.number:hover {
    transform: translateY(-5px);
}

#generate-btn {
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    background-color: var(--primary-color);
    color: var(--number-text);
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s;
    box-shadow: 0 4px 10px var(--shadow-color);
}

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

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-color);
    transition: color 0.3s;
}