body {
    font-family: 'Inter', sans-serif;
    overflow: hidden; /* Prevent scrolling */
}
canvas {
    background-color: #87CEEB; /* Sky Blue */
    display: block;
    touch-action: none; /* Prevents default touch actions like scrolling */
}
.info-panel-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4px 16px;
    align-items: center;
}
.custom-modal-backdrop {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}
.custom-modal-content {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    text-align: center;
}
#curveToolBtn.active {
    background-color: #ef4444; /* Red-500 */
    box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.25);
}
#curveToolBtn.active:hover {
    background-color: #dc2626; /* Red-600 */
}