.page-tool--form-payload-visualizer .tool-page {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.page-tool--form-payload-visualizer .fpv-workspace {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 16px;
    align-items: start;
}

.page-tool--form-payload-visualizer .fpv-fields-panel,
.page-tool--form-payload-visualizer .fpv-output-panel {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.page-tool--form-payload-visualizer .fpv-fields-body,
.page-tool--form-payload-visualizer .fpv-output-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.page-tool--form-payload-visualizer .fpv-textarea {
    min-height: 20rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.7;
}

.page-tool--form-payload-visualizer .tool-hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.6;
}

.page-tool--form-payload-visualizer .tool-hint code {
    padding: 0.05rem 0.35rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-xs);
    background: var(--surface-3);
    color: var(--ink-2);
    font-family: var(--font-mono);
}

.page-tool--form-payload-visualizer .fpv-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.page-tool--form-payload-visualizer .fpv-examples__label {
    margin-right: 2px;
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.page-tool--form-payload-visualizer .fpv-formats {
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

.page-tool--form-payload-visualizer .fpv-formats > .label {
    display: block;
    margin-bottom: 7px;
}

.page-tool--form-payload-visualizer .fpv-formats__options {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.page-tool--form-payload-visualizer .fpv-format {
    position: relative;
    display: inline-flex;
    cursor: pointer;
}

.page-tool--form-payload-visualizer .fpv-format input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    opacity: 0;
    cursor: pointer;
}

.page-tool--form-payload-visualizer .fpv-format span {
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 0.35rem 0.85rem;
    border: 1px solid var(--line-2);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    white-space: nowrap;
    transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.page-tool--form-payload-visualizer .fpv-format:hover span {
    border-color: var(--line-strong);
    color: var(--ink);
}

.page-tool--form-payload-visualizer .fpv-format input:checked + span {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--ink);
    box-shadow: inset 0 0 0 1px var(--accent);
}

.page-tool--form-payload-visualizer .fpv-format input:focus-visible + span {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.page-tool--form-payload-visualizer .fpv-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 16px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    color: var(--faint);
}

.page-tool--form-payload-visualizer .fpv-content-type {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: var(--font-mono);
    text-transform: none;
    letter-spacing: 0;
}

.page-tool--form-payload-visualizer .fpv-output {
    flex: 1 1 auto;
    min-height: 14rem;
    max-height: 30rem;
    margin: 0;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.page-tool--form-payload-visualizer .fpv-output--empty {
    color: var(--faint);
    font-style: italic;
}

.page-tool--form-payload-visualizer .fpv-notes {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.page-tool--form-payload-visualizer .fpv-notes:empty {
    display: none;
}

.page-tool--form-payload-visualizer .fpv-note {
    margin: 0;
    padding: 8px 11px;
    border: 1px solid var(--line);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    color: var(--muted);
    font-size: 0.78rem;
    line-height: 1.5;
}

.page-tool--form-payload-visualizer .fpv-note--warning {
    border-color: var(--danger);
    border-left-color: var(--danger);
    background: var(--danger-soft);
    color: var(--danger);
}

.page-tool--form-payload-visualizer .tool-about__text {
    max-width: 80ch;
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

.page-tool--form-payload-visualizer .tool-about__text code {
    padding: 0.05rem 0.3rem;
    border-radius: var(--radius-xs);
    background: var(--surface-3);
    color: var(--ink-2);
    font-family: var(--font-mono);
}

@media (max-width: 860px) {
    .page-tool--form-payload-visualizer .fpv-workspace {
        grid-template-columns: 1fr;
    }

    .page-tool--form-payload-visualizer .fpv-textarea {
        min-height: 14rem;
    }
}