.bkbg-cpg-app {
    box-sizing: border-box;
    padding: 28px 20px;
}

.bkbg-cpg-title {
    margin: 0 0 4px;
    font-family: var(--bkbg-cpg-tt-font-family, inherit);
    font-size: var(--bkbg-cpg-tt-font-size-d, 22px);
    font-weight: var(--bkbg-cpg-tt-font-weight, 700);
    line-height: var(--bkbg-cpg-tt-line-height-d, 1.25);
    text-transform: var(--bkbg-cpg-tt-text-transform, none);
    font-style: var(--bkbg-cpg-tt-font-style, normal);
    text-decoration: var(--bkbg-cpg-tt-text-decoration, none);
    letter-spacing: var(--bkbg-cpg-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-cpg-tt-word-spacing-d, normal);
}

.bkbg-cpg-subtitle {
    margin: 0 0 18px;
    font-family: var(--bkbg-cpg-st-font-family, inherit);
    font-size: var(--bkbg-cpg-st-font-size-d, 15px);
    font-weight: var(--bkbg-cpg-st-font-weight, 400);
    line-height: var(--bkbg-cpg-st-line-height-d, 1.4);
    text-transform: var(--bkbg-cpg-st-text-transform, none);
    font-style: var(--bkbg-cpg-st-font-style, normal);
    text-decoration: var(--bkbg-cpg-st-text-decoration, none);
    letter-spacing: var(--bkbg-cpg-st-letter-spacing-d, normal);
    word-spacing: var(--bkbg-cpg-st-word-spacing-d, normal);
    opacity: 0.75;
}

/* ---- Layout containers ---- */

.bkbg-cpg-editors {
    display: flex;
    gap: 8px;
}

.bkbg-cpg-editors.bkbg-cpg-vertical {
    flex-direction: column;
}

.bkbg-cpg-editors.bkbg-cpg-horizontal {
    flex-direction: row;
}

.bkbg-cpg-editors.bkbg-cpg-tabbed {
    flex-direction: column;
}

/* ---- Single editor panel ---- */

.bkbg-cpg-panel {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.1);
}

.bkbg-cpg-panel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #fff;
    user-select: none;
    cursor: pointer;
}

.bkbg-cpg-panel-header.bkbg-cpg-js-header {
    color: #1e1b4b;
}

.bkbg-cpg-textarea {
    width: 100%;
    box-sizing: border-box;
    border: none;
    resize: vertical;
    outline: none;
    padding: 12px;
    font-family: 'Courier New', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.65;
    tab-size: 2;
    -moz-tab-size: 2;
    white-space: pre;
    overflow-x: auto;
}

/* ---- Tab mode ---- */

.bkbg-cpg-tabs {
    display: flex;
    gap: 2px;
    margin-bottom: 8px;
}

.bkbg-cpg-tab-btn {
    padding: 6px 18px;
    border: none;
    border-radius: 6px 6px 0 0;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
    letter-spacing: 0.04em;
}

.bkbg-cpg-tab-btn.bkbg-cpg-active {
    opacity: 1;
}

/* ---- Run/Reset bar ---- */

.bkbg-cpg-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin: 10px 0;
    flex-wrap: wrap;
}

.bkbg-cpg-run-btn,
.bkbg-cpg-reset-btn {
    border: none;
    border-radius: 6px;
    padding: 7px 18px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.15s, transform 0.1s;
}

.bkbg-cpg-run-btn:hover,
.bkbg-cpg-reset-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.bkbg-cpg-autorun-label {
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

/* ---- Preview frame ---- */

.bkbg-cpg-preview-wrap {
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.1);
}

.bkbg-cpg-preview-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    color: #e2e8f0;
}

.bkbg-cpg-preview-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #22c55e;
    display: inline-block;
}

.bkbg-cpg-iframe {
    display: block;
    width: 100%;
    border: none;
}

/* ── Typography responsive ── */
@media (max-width: 1024px) {
    .bkbg-cpg-title {
        font-size: var(--bkbg-cpg-tt-font-size-t, var(--bkbg-cpg-tt-font-size-d, 22px));
        line-height: var(--bkbg-cpg-tt-line-height-t, var(--bkbg-cpg-tt-line-height-d, 1.25));
        letter-spacing: var(--bkbg-cpg-tt-letter-spacing-t, var(--bkbg-cpg-tt-letter-spacing-d, normal));
        word-spacing: var(--bkbg-cpg-tt-word-spacing-t, var(--bkbg-cpg-tt-word-spacing-d, normal));
    }
    .bkbg-cpg-subtitle {
        font-size: var(--bkbg-cpg-st-font-size-t, var(--bkbg-cpg-st-font-size-d, 15px));
        line-height: var(--bkbg-cpg-st-line-height-t, var(--bkbg-cpg-st-line-height-d, 1.4));
        letter-spacing: var(--bkbg-cpg-st-letter-spacing-t, var(--bkbg-cpg-st-letter-spacing-d, normal));
        word-spacing: var(--bkbg-cpg-st-word-spacing-t, var(--bkbg-cpg-st-word-spacing-d, normal));
    }
}
@media (max-width: 767px) {
    .bkbg-cpg-title {
        font-size: var(--bkbg-cpg-tt-font-size-m, var(--bkbg-cpg-tt-font-size-t, var(--bkbg-cpg-tt-font-size-d, 22px)));
        line-height: var(--bkbg-cpg-tt-line-height-m, var(--bkbg-cpg-tt-line-height-t, var(--bkbg-cpg-tt-line-height-d, 1.25)));
        letter-spacing: var(--bkbg-cpg-tt-letter-spacing-m, var(--bkbg-cpg-tt-letter-spacing-t, var(--bkbg-cpg-tt-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-cpg-tt-word-spacing-m, var(--bkbg-cpg-tt-word-spacing-t, var(--bkbg-cpg-tt-word-spacing-d, normal)));
    }
    .bkbg-cpg-subtitle {
        font-size: var(--bkbg-cpg-st-font-size-m, var(--bkbg-cpg-st-font-size-t, var(--bkbg-cpg-st-font-size-d, 15px)));
        line-height: var(--bkbg-cpg-st-line-height-m, var(--bkbg-cpg-st-line-height-t, var(--bkbg-cpg-st-line-height-d, 1.4)));
        letter-spacing: var(--bkbg-cpg-st-letter-spacing-m, var(--bkbg-cpg-st-letter-spacing-t, var(--bkbg-cpg-st-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-cpg-st-word-spacing-m, var(--bkbg-cpg-st-word-spacing-t, var(--bkbg-cpg-st-word-spacing-d, normal)));
    }
}

/* ---- Responsive ---- */

@media (max-width: 640px) {
    .bkbg-cpg-editors.bkbg-cpg-horizontal {
        flex-direction: column;
    }
    .bkbg-cpg-app {
        padding: 16px 10px;
    }
}