.bkbg-jf-app {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
}
.bkbg-jf-card {
    margin: 0 auto;
    padding: 36px 32px;
    box-shadow: 0 4px 32px rgba(0,0,0,0.08);
}
.bkbg-jf-title {
    text-align: center;
    font-family: var(--bkbg-jf-tt-font-family, inherit);
    font-size: var(--bkbg-jf-tt-font-size-d, 26px);
    font-weight: var(--bkbg-jf-tt-font-weight, 800);
    font-style: var(--bkbg-jf-tt-font-style, normal);
    text-decoration: var(--bkbg-jf-tt-text-decoration, none);
    text-transform: var(--bkbg-jf-tt-text-transform, none);
    line-height: var(--bkbg-jf-tt-line-height-d, 1.2);
    letter-spacing: var(--bkbg-jf-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-jf-tt-word-spacing-d, normal);
    margin-bottom: 6px;
}
@media (max-width: 1024px) {
    .bkbg-jf-title {
        font-size: var(--bkbg-jf-tt-font-size-t, var(--bkbg-jf-tt-font-size-d, 26px));
        line-height: var(--bkbg-jf-tt-line-height-t, var(--bkbg-jf-tt-line-height-d, 1.2));
        letter-spacing: var(--bkbg-jf-tt-letter-spacing-t, var(--bkbg-jf-tt-letter-spacing-d, normal));
        word-spacing: var(--bkbg-jf-tt-word-spacing-t, var(--bkbg-jf-tt-word-spacing-d, normal));
    }
}
@media (max-width: 767px) {
    .bkbg-jf-title {
        font-size: var(--bkbg-jf-tt-font-size-m, var(--bkbg-jf-tt-font-size-t, var(--bkbg-jf-tt-font-size-d, 26px)));
        line-height: var(--bkbg-jf-tt-line-height-m, var(--bkbg-jf-tt-line-height-t, var(--bkbg-jf-tt-line-height-d, 1.2)));
        letter-spacing: var(--bkbg-jf-tt-letter-spacing-m, var(--bkbg-jf-tt-letter-spacing-t, var(--bkbg-jf-tt-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-jf-tt-word-spacing-m, var(--bkbg-jf-tt-word-spacing-t, var(--bkbg-jf-tt-word-spacing-d, normal)));
    }
}
.bkbg-jf-subtitle {
    text-align: center;
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 24px;
}
/* Toolbar */
.bkbg-jf-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
    align-items: center;
}
.bkbg-jf-btn {
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 700;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.18s, transform 0.1s;
}
.bkbg-jf-btn:hover  { opacity: 0.88; transform: translateY(-1px); }
.bkbg-jf-btn:active { transform: translateY(0); }
.bkbg-jf-btn-secondary {
    background: #f3f4f6;
    color: #374151;
    border: 1.5px solid #e5e7eb;
}
.bkbg-jf-btn-secondary:hover { background: #e5e7eb; opacity: 1; }
/* Status badge */
.bkbg-jf-status {
    margin-left: auto;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border-radius: 99px;
}
/* Editor split layout */
.bkbg-jf-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
@media (max-width: 640px) { .bkbg-jf-split { grid-template-columns: 1fr; } }
.bkbg-jf-pane-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #9ca3af;
    margin-bottom: 6px;
}
/* Editor pane */
.bkbg-jf-editor-wrap {
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.bkbg-jf-editor-inner {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}
.bkbg-jf-line-nums {
    padding: 14px 10px 14px 14px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    line-height: 1.65;
    text-align: right;
    user-select: none;
    overflow: hidden;
}
.bkbg-jf-textarea {
    flex: 1;
    padding: 14px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    line-height: 1.65;
    border: none;
    background: transparent;
    color: inherit;
    resize: none;
    outline: none;
    overflow: auto;
    tab-size: 2;
}
/* Output pane */
.bkbg-jf-output {
    padding: 14px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    line-height: 1.65;
    overflow: auto;
    white-space: pre;
    border-radius: 10px;
    flex: 1;
}
/* Syntax colours applied via spans */
.bkbg-jf-key   { }
.bkbg-jf-str   { }
.bkbg-jf-num   { }
.bkbg-jf-bool  { }
.bkbg-jf-null  { }
.bkbg-jf-punct { }
/* Error bar */
.bkbg-jf-error-bar {
    margin-top: 12px;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
/* Stats bar */
.bkbg-jf-stats-bar {
    margin-top: 12px;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 12px;
    color: #9ca3af;
    font-weight: 600;
}
.bkbg-jf-stat-item strong { color: #374151; }
/* Copy feedback */
.bkbg-jf-copied {
    font-size: 12px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 99px;
    background: #dcfce7;
    color: #16a34a;
    display: none;
}
@media (max-width: 600px) {
    .bkbg-jf-card { padding: 24px 16px; }
}