.page-tool--query-string-builder .tool-page {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.page-tool--query-string-builder .tool-workspace {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

.page-tool--query-string-builder .qsb-pane {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.page-tool--query-string-builder .qsb-pairs__body {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.page-tool--query-string-builder .qsb-optional {
    color: var(--faint);
    font-weight: 400;
    letter-spacing: 0.04em;
}

.page-tool--query-string-builder .tool-hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.8rem;
}

.page-tool--query-string-builder .tool-hint code,
.page-tool--query-string-builder .qsb-options__grid code {
    padding: 0.05rem 0.3rem;
    border-radius: var(--radius-xs);
    background: var(--surface-3);
    color: var(--ink-2);
    font-family: var(--font-mono);
}

.page-tool--query-string-builder .qsb-pairs {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.page-tool--query-string-builder .qsb-rows {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.page-tool--query-string-builder .qsb-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr) auto;
    gap: 8px;
    align-items: center;
}

.page-tool--query-string-builder .qsb-row__field {
    min-width: 0;
}

.page-tool--query-string-builder .qsb-row__input {
    min-height: 42px;
    padding: 0.45rem 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.page-tool--query-string-builder .qsb-row__input--key {
    color: var(--ink);
}

.page-tool--query-string-builder .qsb-row__remove {
    width: 42px;
    height: 42px;
    padding: 0;
    font-size: 1.1rem;
    line-height: 1;
    color: var(--faint);
}

.page-tool--query-string-builder .qsb-row__remove:hover {
    color: var(--danger);
}

.page-tool--query-string-builder .qsb-pairs__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.page-tool--query-string-builder .qsb-options {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
}

.page-tool--query-string-builder .qsb-options__summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 13px;
    cursor: pointer;
    list-style: none;
}

.page-tool--query-string-builder .qsb-options__summary::-webkit-details-marker {
    display: none;
}

.page-tool--query-string-builder .qsb-options__summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
}

.page-tool--query-string-builder .qsb-options__summary .panel__title {
    font-size: 0.78rem;
}

.page-tool--query-string-builder .qsb-options__chevron {
    font-family: var(--font-mono);
    color: var(--muted);
}

.page-tool--query-string-builder .qsb-options[open] .qsb-options__chevron {
    transform: rotate(45deg);
}

.page-tool--query-string-builder .qsb-options__grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
    padding: 0 13px 13px;
}

.page-tool--query-string-builder .qsb-options__checks {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 9px;
}

.page-tool--query-string-builder .qsb-check {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--ink-2);
    cursor: pointer;
}

.page-tool--query-string-builder .qsb-check input {
    margin-top: 0.15rem;
    accent-color: var(--accent);
}

.page-tool--query-string-builder .qsb-result__body {
    display: flex;
    flex-direction: column;
    gap: 12px;
    height: 100%;
}

.page-tool--query-string-builder .tool-status {
    margin: 0;
    padding: 0;
    min-height: 1.2em;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--muted);
}

.page-tool--query-string-builder .tool-status.status {
    margin: 0;
    padding: 8px 11px;
    border: 1px solid var(--line);
    border-left: 3px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
}

.page-tool--query-string-builder .tool-status.status--error {
    border-color: var(--danger);
    border-left-color: var(--danger);
    background: var(--danger-soft);
    color: var(--danger);
}

.page-tool--query-string-builder .tool-status.status--success {
    border-color: var(--success);
    border-left-color: var(--success);
    background: var(--success-soft);
    color: var(--success);
}

.page-tool--query-string-builder .qsb-output__field {
    flex: 1 1 auto;
    min-height: 16rem;
    padding: 14px 15px;
    border-color: var(--accent-line);
    background: var(--surface-2);
    font-size: 0.9rem;
    line-height: 1.65;
    overflow-wrap: anywhere;
    word-break: break-all;
}

.page-tool--query-string-builder .qsb-result__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.page-tool--query-string-builder .qsb-about__text {
    max-width: 80ch;
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.page-tool--query-string-builder .qsb-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--query-string-builder .tool-workspace {
        grid-template-columns: 1fr;
    }

    .page-tool--query-string-builder .qsb-output__field {
        min-height: 10rem;
    }
}

@media (max-width: 640px) {
    .page-tool--query-string-builder .qsb-options__grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 560px) {
    .page-tool--query-string-builder .qsb-row {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .page-tool--query-string-builder .qsb-row__field--value {
        grid-column: 1;
    }

    .page-tool--query-string-builder .qsb-row__remove {
        grid-column: 2;
        grid-row: 1 / span 2;
        height: 100%;
    }
}