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

.page-tool--regex-builder .tool-status {
    min-height: 0;
    margin: 0 0 12px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.page-tool--regex-builder .tool-status.status {
    margin: 0 0 12px;
    border-radius: var(--radius-sm);
}

.page-tool--regex-builder .tool-output__display {
    padding: 16px 18px;
    border: 1px solid var(--line-2);
    border-radius: var(--radius);
    background: var(--surface-2);
    overflow-x: auto;
}

.page-tool--regex-builder .tool-regex {
    display: block;
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 1.05rem;
    line-height: 1.65;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.page-tool--regex-builder .tool-regex--empty {
    color: var(--faint);
    font-size: 0.92rem;
}

.page-tool--regex-builder .tool-output__controls {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
    margin-top: 12px;
}

.page-tool--regex-builder .field--inline {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.page-tool--regex-builder .tool-hint {
    margin: 10px 0 0;
    color: var(--muted);
    font-size: 0.8rem;
}

.page-tool--regex-builder .tool-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

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

.page-tool--regex-builder .tool-presets {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.page-tool--regex-builder .tool-presets__list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.page-tool--regex-builder .tool-preset {
    font-size: 0.78rem;
}

.page-tool--regex-builder .tool-add {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    margin-bottom: 16px;
}

.page-tool--regex-builder .tool-add .field {
    flex: 1 1 auto;
}

.page-tool--regex-builder .tool-blocks {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.page-tool--regex-builder .tool-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
}

.page-tool--regex-builder .tool-block--invalid {
    border-color: var(--danger);
    background: var(--danger-soft);
}

.page-tool--regex-builder .tool-block__head {
    display: flex;
    align-items: center;
    gap: 8px;
}

.page-tool--regex-builder .tool-block__index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--surface-3);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
}

.page-tool--regex-builder .tool-block__label {
    color: var(--ink);
    font-size: 0.88rem;
    font-weight: 600;
}

.page-tool--regex-builder .tool-block__hint {
    margin-left: auto;
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 45%;
}

.page-tool--regex-builder .tool-block__field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.page-tool--regex-builder .tool-block__field-label {
    color: var(--muted);
    font-size: 0.72rem;
}

.page-tool--regex-builder .tool-block__value {
    min-height: 38px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.page-tool--regex-builder .tool-block__controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.page-tool--regex-builder .tool-block__count {
    width: 5.5rem;
    min-height: 38px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.page-tool--regex-builder .tool-block__range-sep {
    color: var(--muted);
    font-size: 0.78rem;
}

.page-tool--regex-builder .tool-block__capture {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: 0.8rem;
}

.page-tool--regex-builder .tool-block__actions {
    display: flex;
    gap: 6px;
}

.page-tool--regex-builder .tool-block__button {
    min-width: 2.2rem;
    padding: 0.3rem 0.6rem;
    font-size: 0.85rem;
}

.page-tool--regex-builder .tool-options {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 20px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
}

.page-tool--regex-builder .tool-options__group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

.page-tool--regex-builder .tool-options__group .label {
    margin-bottom: 2px;
}

.page-tool--regex-builder .tool-check,
.page-tool--regex-builder .tool-flag {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: 0.82rem;
}

.page-tool--regex-builder .tool-flags {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.page-tool--regex-builder .tool-sample__input {
    min-height: 12rem;
}

.page-tool--regex-builder .tool-hint--count {
    margin-top: 10px;
}

.page-tool--regex-builder .tool-preview {
    max-height: 18rem;
    margin-top: 4px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--ink-2);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.75;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    overflow: auto;
}

.page-tool--regex-builder .tool-hit {
    padding: 0 1px;
    border-radius: 3px;
    background: var(--accent-soft);
    color: var(--ink);
    box-shadow: inset 0 0 0 1px var(--accent);
}

.page-tool--regex-builder .tool-matches {
    margin-top: 10px;
}

.page-tool--regex-builder .tool-match-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin: 0;
    padding: 0;
    list-style: none;
    font-family: var(--font-mono);
    font-size: 0.76rem;
}

.page-tool--regex-builder .tool-match {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    padding: 5px 0;
    border-bottom: 1px solid var(--line);
}

.page-tool--regex-builder .tool-match:last-child {
    border-bottom: 0;
}

.page-tool--regex-builder .tool-match__index {
    flex: 0 0 auto;
    color: var(--faint);
}

.page-tool--regex-builder .tool-match__value {
    color: var(--accent);
    overflow-wrap: anywhere;
}

.page-tool--regex-builder .tool-match__meta {
    color: var(--muted);
}

.page-tool--regex-builder .tool-match__groups {
    flex: 1 1 100%;
    color: var(--ink-2);
    overflow-wrap: anywhere;
}

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

@media (max-width: 900px) {
    .page-tool--regex-builder .tool-workspace {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .page-tool--regex-builder .tool-output__controls {
        flex-direction: column;
        align-items: stretch;
    }

    .page-tool--regex-builder .field--inline {
        justify-content: space-between;
    }

    .page-tool--regex-builder .tool-add {
        flex-direction: column;
        align-items: stretch;
    }

    .page-tool--regex-builder .tool-block__hint {
        display: none;
    }
}