:root {
    --primary-color: #FF6B6B;
    --secondary-color: #FFE66D;
    --background-color: #F7F7F7;
    --container-bg: white;
    --text-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --background-color: #1A1A1A;
    --container-bg: #2D2D2D;
    --text-color: #F7F7F7;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --secondary-color: #FFD93D;
}

body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill='%239C92AC' fill-opacity='0.05'%3E%3Crect x='0' y='0' width='100' height='100'/%3E%3C/g%3E%3C/svg%3E");
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    text-align: center;
    padding: 40px;
    background-color: var(--container-bg);
    border-radius: 20px;
    box-shadow: 0 10px 20px var(--shadow-color), 0 6px 6px var(--shadow-color);
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

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

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

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.number {
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--secondary-color);
    color: #333;
    font-size: 24px;
    font-weight: bold;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.5s ease-in-out;
}

#generate-btn {
    padding: 15px 30px;
    font-size: 18px;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.5);
}

#generate-btn:hover {
    background-color: #FF8E8E;
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.7);
}

.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;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}