body {
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: #e5e7eb;
    display: flex;
    justify-content: center;
    padding-top: 20px;
}

.container {
    background: #020617;
    padding: 25px;
    width: 600px;
    border-radius: 10px;
    box-shadow: 0 0 20px #000;
}

button {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    background: #2563eb;
    border: none;
    border-radius: 6px;
    color: white;
    cursor: pointer;
    margin-bottom: 15px;
}

button:hover {
    background: #1d4ed8;
}

.results p, .charts {
    margin-top: 10px;
}

canvas {
    background: #111827;
    margin-bottom: 20px;
    border-radius: 6px;
}

pre {
    background: #020617;
    padding: 10px;
    border-radius: 6px;
    font-size: 13px;
    overflow-x: auto;
}