/* Live text editing overlay, positioned over the canvas element being edited */
        .text-input {
            position: absolute;
            /* An outline instead of a border: a border would inset the typed text by its own width,
               so the label visibly jumped by 2px the moment it was committed to the canvas. */
            outline: 2px dashed var(--btn-active-bg);
            background: transparent;
            font-size: 16px; /* Overridden per element by startTextEdit() */
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.2; /* Must match TEXT_LINE_HEIGHT so the overlay and the drawing align */
            border: none;
            padding: 0;
            margin: 0;
            min-width: 20px;
            overflow: hidden;
            resize: none;
            white-space: pre;
            caret-color: var(--btn-active-bg);
            text-align: left;
            font-weight: normal;
            font-style: normal;
            text-decoration: none;
            z-index: 5;
        }

        /* Non-blocking status messages (replaces alert() for export/import feedback) */
        .toast-stack {
            position: absolute;
            top: 12px;
            left: 0;
            right: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            pointer-events: none; /* Never steal clicks from the canvas underneath */
            z-index: 1002;
        }

        .toast {
            background: var(--toast-bg);
            color: var(--toast-color);
            padding: 8px 14px;
            border-radius: 6px;
            font-size: 0.9em;
            max-width: 90%;
            box-shadow: 0 2px 8px var(--toolbar-shadow);
            animation: fadeIn 0.2s ease;
        }

        .toast.error {
            background: var(--toast-error-bg);
            color: #ffffff;
        }