:root {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #ffffff;
    --btn-bg: #6200ea;
    --btn-hover: #7f39fb;
    --shadow: rgba(0, 0, 0, 0.2);
    --btn-shadow: rgba(98, 0, 234, 0.5);
    --pattern-opacity: 0.4;
}

body.light-mode {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --btn-bg: #007bff;
    --btn-hover: #0056b3;
    --shadow: rgba(0, 0, 0, 0.1);
    --btn-shadow: rgba(0, 123, 255, 0.4);
    --pattern-opacity: 0.1;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('realistic-lotto-falling-colourful-balls-with-numbers_88138-791.avif');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

body.light-mode {
    background-image: linear-gradient(rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.6)), url('realistic-lotto-falling-colourful-balls-with-numbers_88138-791.avif');
}

.container {
    text-align: center;
    z-index: 1;
}

.lotto-card {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--shadow), 0 6px 6px var(--shadow);
    display: inline-block;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.numbers-display {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.number-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 0 10px var(--btn-shadow);
}

.generate-btn:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 0 20px var(--btn-shadow);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--container-bg);
    color: var(--text-color);
    border: 2px solid var(--btn-bg);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
    z-index: 1000;
    box-shadow: 0 4px 6px var(--shadow);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow);
}