:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --border-color: #dee2e6;
    --primary: #0d6efd;
    --danger: #dc3545;
    --warning: #ffc107;
    --success: #198754;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1, h2 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

ul {
    padding-left: 20px;
}

li {
    margin-bottom: 0.5rem;
}

code {
    background: #e9ecef;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}

canvas {
    display: block;
    margin: 1.5rem auto;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1rem;
}

button {
    padding: 0.5rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    background: #333;
    color: #fff;
    border: none;
    border-radius: 4px;
}

button:hover {
    background: #555;
}

#status {
    font-weight: bold;
    min-width: 300px;
    text-align: center;
}