:root {
    --primary-color: #4a90e2;
    --background-color: #f0f4f8;
    --text-color: #333;
    --card-bg: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --number-bg: #e0e0e0;
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --text-color: #f0f4f8;
    --card-bg: #2d2d2d;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --number-bg: #444;
}

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

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

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

#theme-btn {
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

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

#generator-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 10px rgba(74, 144, 226, 0.4);
}

#generator-btn:hover {
    background-color: #357abd;
    transform: translateY(-2px);
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
}

.lotto-number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    font-size: 22px;
    font-weight: bold;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}