.bkbg-pxa-app {
    box-sizing: border-box;
    padding: 24px 20px;
    font-family: system-ui, sans-serif;
}

.bkbg-pxa-title {
    text-align: center;
    margin: 0 0 4px;
    font-family: var(--bkbg-pxa-tt-font-family, inherit);
    font-size: var(--bkbg-pxa-tt-font-size-d, 26px);
    font-weight: var(--bkbg-pxa-tt-font-weight, 700);
    font-style: var(--bkbg-pxa-tt-font-style, normal);
    text-decoration: var(--bkbg-pxa-tt-text-decoration, none);
    text-transform: var(--bkbg-pxa-tt-text-transform, none);
    line-height: var(--bkbg-pxa-tt-line-height-d, 1.2);
    letter-spacing: var(--bkbg-pxa-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-pxa-tt-word-spacing-d, normal);
}
.bkbg-pxa-app h3.bkbg-pxa-title,
.bkbg-pxa-app .bkbg-pxa-title {
    font-family: var(--bkbg-pxa-tt-font-family, inherit);
    font-size: var(--bkbg-pxa-tt-font-size-d, 26px);
    font-weight: var(--bkbg-pxa-tt-font-weight, 700);
    font-style: var(--bkbg-pxa-tt-font-style, normal);
    text-decoration: var(--bkbg-pxa-tt-text-decoration, none);
    text-transform: var(--bkbg-pxa-tt-text-transform, none);
    line-height: var(--bkbg-pxa-tt-line-height-d, 1.2);
    letter-spacing: var(--bkbg-pxa-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-pxa-tt-word-spacing-d, normal);
}

.bkbg-pxa-subtitle {
    text-align: center;
    margin: 0 0 14px;
    opacity: 0.65;
    font-family: var(--bkbg-pxa-st-font-family, inherit);
    font-size: var(--bkbg-pxa-st-font-size-d, 14px);
    font-weight: var(--bkbg-pxa-st-font-weight, 400);
    font-style: var(--bkbg-pxa-st-font-style, normal);
    text-decoration: var(--bkbg-pxa-st-text-decoration, none);
    text-transform: var(--bkbg-pxa-st-text-transform, none);
    line-height: var(--bkbg-pxa-st-line-height-d, 1.4);
    letter-spacing: var(--bkbg-pxa-st-letter-spacing-d, normal);
    word-spacing: var(--bkbg-pxa-st-word-spacing-d, normal);
}

/* ---- Toolbar ---- */

.bkbg-pxa-toolbar {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 10px;
}

.bkbg-pxa-tool-btn {
    border: 2px solid transparent;
    border-radius: 7px;
    padding: 5px 13px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    background: transparent;
}

.bkbg-pxa-tool-btn.bkbg-pxa-active {
    border-color: currentColor;
}

.bkbg-pxa-swatch {
    width: 26px;
    height: 26px;
    border-radius: 5px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.1s, border-color 0.15s;
    flex-shrink: 0;
}

.bkbg-pxa-swatch:hover { transform: scale(1.2); }

.bkbg-pxa-swatch.bkbg-pxa-selected {
    border-color: #000;
    transform: scale(1.25);
    box-shadow: 0 0 0 2px #fff inset;
}

/* ---- Canvas wrap ---- */

.bkbg-pxa-canvas-wrap {
    display: flex;
    justify-content: center;
    overflow: auto;
    margin-bottom: 10px;
}

.bkbg-pxa-canvas {
    display: block;
    cursor: crosshair;
    image-rendering: pixelated;
    border-radius: 4px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.12);
    touch-action: none;
}

/* ---- Actions ---- */

.bkbg-pxa-actions {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.bkbg-pxa-btn {
    border: none;
    border-radius: 8px;
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.15s, transform 0.1s;
}

.bkbg-pxa-btn:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
}

/* ---- Size indicator ---- */

.bkbg-pxa-size-info {
    text-align: center;
    font-size: 11px;
    opacity: 0.4;
    margin-top: 8px;
    letter-spacing: 0.05em;
}

@media (max-width: 1024px) {
    .bkbg-pxa-app .bkbg-pxa-title {
        font-size: var(--bkbg-pxa-tt-font-size-t, var(--bkbg-pxa-tt-font-size-d, 26px));
        line-height: var(--bkbg-pxa-tt-line-height-t, var(--bkbg-pxa-tt-line-height-d, 1.2));
        letter-spacing: var(--bkbg-pxa-tt-letter-spacing-t, var(--bkbg-pxa-tt-letter-spacing-d, normal));
        word-spacing: var(--bkbg-pxa-tt-word-spacing-t, var(--bkbg-pxa-tt-word-spacing-d, normal));
    }
    .bkbg-pxa-subtitle {
        font-size: var(--bkbg-pxa-st-font-size-t, var(--bkbg-pxa-st-font-size-d, 14px));
        line-height: var(--bkbg-pxa-st-line-height-t, var(--bkbg-pxa-st-line-height-d, 1.4));
        letter-spacing: var(--bkbg-pxa-st-letter-spacing-t, var(--bkbg-pxa-st-letter-spacing-d, normal));
        word-spacing: var(--bkbg-pxa-st-word-spacing-t, var(--bkbg-pxa-st-word-spacing-d, normal));
    }
}
@media (max-width: 767px) {
    .bkbg-pxa-app .bkbg-pxa-title {
        font-size: var(--bkbg-pxa-tt-font-size-m, var(--bkbg-pxa-tt-font-size-t, var(--bkbg-pxa-tt-font-size-d, 26px)));
        line-height: var(--bkbg-pxa-tt-line-height-m, var(--bkbg-pxa-tt-line-height-t, var(--bkbg-pxa-tt-line-height-d, 1.2)));
        letter-spacing: var(--bkbg-pxa-tt-letter-spacing-m, var(--bkbg-pxa-tt-letter-spacing-t, var(--bkbg-pxa-tt-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-pxa-tt-word-spacing-m, var(--bkbg-pxa-tt-word-spacing-t, var(--bkbg-pxa-tt-word-spacing-d, normal)));
    }
    .bkbg-pxa-subtitle {
        font-size: var(--bkbg-pxa-st-font-size-m, var(--bkbg-pxa-st-font-size-t, var(--bkbg-pxa-st-font-size-d, 14px)));
        line-height: var(--bkbg-pxa-st-line-height-m, var(--bkbg-pxa-st-line-height-t, var(--bkbg-pxa-st-line-height-d, 1.4)));
        letter-spacing: var(--bkbg-pxa-st-letter-spacing-m, var(--bkbg-pxa-st-letter-spacing-t, var(--bkbg-pxa-st-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-pxa-st-word-spacing-m, var(--bkbg-pxa-st-word-spacing-t, var(--bkbg-pxa-st-word-spacing-d, normal)));
    }
}

@media (max-width: 480px) {
    .bkbg-pxa-app { padding: 14px 8px; }
}