:root {
    --bg-color: #f0f0f0;
    --container-bg: #ffffff;
    --text-color: #333333;
    --circle-bg: #4CAF50;
    --button-bg: #007BFF;
    --button-hover: #0056b3;
    --shadow: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --circle-bg: #388e3c;
    --button-bg: #bb86fc;
    --button-hover: #9965f4;
    --shadow: rgba(255, 255, 255, 0.05);
}

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

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

.theme-toggle button {
    padding: 0.5rem 1rem;
    cursor: pointer;
    border: 1px solid var(--text-color);
    background: transparent;
    color: var(--text-color);
    border-radius: 20px;
    transition: all 0.3s;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
    width: 90%;
    max-width: 500px;
}

.machine-container {
    min-height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 2rem 0;
}

.numbers {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.3rem;
    font-weight: bold;
    color: white;
    background-color: var(--circle-bg);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    
    /* Animation properties */
    opacity: 0;
    transform: translateY(20px) scale(0.5);
    animation: ballAppear 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes ballAppear {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

#generate {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    background-color: var(--button-bg);
    color: white;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.3s;
}

#generate:hover {
    background-color: var(--button-hover);
    transform: scale(1.05);
}

#generate:active {
    transform: scale(0.95);
}

#generate:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}