:root {
    --primary-color: #6A5ACD; /* SlateBlue */
    --secondary-color: #48D1CC; /* MediumTurquoise */
    --background-color: #F5F5F5; /* WhiteSmoke */
    --surface-color: #FFFFFF;
    --text-color: #333333;
    --border-radius: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
}

h1 {
    color: var(--primary-color);
    font-weight: 700;
}

.card {
    border-radius: var(--border-radius);
    border: none;
    background-color: var(--surface-color);
}

#visualizer {
    width: 100%;
    height: auto;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-weight: 700;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn-primary:hover {
    background-color: #5948c1; /* Darker SlateBlue */
    border-color: #5948c1;
    transform: translateY(-2px);
}

.btn-primary:focus, .btn-primary.focus {
    box-shadow: 0 0 0 0.2rem rgba(106, 90, 205, 0.5);
}

.btn-primary:disabled {
    background-color: #b5a9e8;
    border-color: #b5a9e8;
}

#status {
    color: #6c757d;
    min-height: 24px;
}