body {
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f4f8;
}

#app-container {
    background-color: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    color: #007bff;
    margin-bottom: 20px;
}

/* --- Controls Styling --- */
#controls {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #e9e9e9;
    border-radius: 5px;
    display: flex;
    gap: 15px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

#brush-size {
    width: 80px;
}

#clear-button {
    padding: 8px 15px;
    background-color: #e74c3c;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#clear-button:hover {
    background-color: #c0392b;
}

/* --- Canvas Styling --- */
#symmetry-canvas {
    border: 3px solid #333;
    background-color: white;
    cursor: crosshair;
}