body {
    font-family: Arial, sans-serif;
    background: #f8fafc;
    margin: 0;
    padding: 0;
}

.toolbar {
    position: fixed;
    display: flex;
    gap: 8px;
    padding: 10px;
    background: #0f172a;
    color: white;
    align-items: center;
    flex-wrap: wrap;
}

.toolbar button {
    padding: 6px 10px;
    border: none;
    border-radius: 6px;
    background: #2563eb;
    color: white;
    cursor: pointer;
}

.toolbar input {
    width: 60px;
    padding: 4px;
}

.viewer {
    display: flex;
    justify-content: center;
    padding: 20px;
}

canvas {
    border: 1px solid #cbd5e1;
    background: white;
}