:root {
    --color-start: #000000;
    --color-end: #ffffff;
    --animation-state: paused;
    --animation-duration: 0.25s;
}

.container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 1rem;
    text-align: center;
}

.color-inputs {
    margin-bottom: 2rem;
}

.input-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 0 1rem;
}

.input-group > div {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.input-group input {
    width: 80px;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    text-align: center;
}

.color-preview {
    height: 128px;
    width: 128px;
    margin: 0 auto;
    border: 1px solid #333;
    border-radius: 8px;
    background-color: var(--color-start);
    animation: colorCycle var(--animation-duration) infinite linear;
    animation-play-state: var(--animation-state);
}

.control-button {
    margin-top: 1rem;
    padding: 0.5rem 2rem;
    font-size: 1rem;
    border: none;
    border-radius: 4px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
    transition: background-color 0.2s;
}

.control-button:hover {
    background-color: #0056b3;
}

@keyframes colorCycle {
    from {
        background-color: var(--color-start);
    }
    to {
        background-color: var(--color-end);
    }
}