:root {
    --bg-color: #1a1a1a;
    --primary-color: #2a2a2a;
    --secondary-color: #3a3a3a;
    --accent-color: #00aaff;
    --text-color: #ffffff;
    --glow-color: rgba(0, 170, 255, 0.5);

    --font-primary: 'Arial', sans-serif;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: radial-gradient(circle, var(--secondary-color) 1px, transparent 1px);
    background-size: 20px 20px;
}

.app-container {
    width: 90%;
    max-width: 500px;
    background-color: var(--primary-color);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px var(--glow-color);
    padding: 2rem;
    border: 1px solid var(--secondary-color);
    text-align: center;
}

.app-header h1 {
    text-align: center;
    color: var(--accent-color);
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-shadow: 0 0 10px var(--glow-color);
}

#lotto-generator h2 {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    text-shadow: 0 0 8px var(--glow-color);
}

#generate-lotto-btn {
    padding: 0.8rem 2rem;
    border: none;
    background-color: var(--accent-color);
    color: var(--text-color);
    font-size: 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    margin-bottom: 1.5rem;
}

#generate-lotto-btn:hover {
    background-color: #0088cc;
    box-shadow: 0 0 20px var(--glow-color);
}

#lotto-numbers {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.lotto-number {
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--secondary-color);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4), inset 0 2px 4px rgba(0,0,0,0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lotto-number:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.5), 0 0 15px var(--glow-color);
}