.regex-pattern-panel {
    display: grid;
    gap: 0.85rem;
    margin-bottom: 1rem;
}

.regex-tool-page .regex-pattern-panel .tool-panel-header {
    margin-bottom: 0;
}

.regex-preset-field {
    min-width: 220px;
}

.regex-pattern-row {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0 0.85rem;
    border: 1px solid var(--tool-line);
    border-radius: 12px;
    background: #fbfdfb;
    font-family: Consolas, Monaco, 'Courier New', monospace;
}

.regex-pattern-row:focus-within {
    border-color: rgba(126, 217, 87, 0.9);
    box-shadow: 0 0 0 4px rgba(126, 217, 87, 0.12);
}

.regex-pattern-row.invalid {
    border-color: #fda29b;
}

.regex-pattern-row input {
    flex: 1;
    min-width: 0;
    min-height: 54px;
    border: 0;
    outline: 0;
    background: transparent;
    color: #101828;
    font-family: inherit;
    font-size: 1.02rem;
    letter-spacing: 0.01em;
}

.regex-pattern-row input::placeholder {
    color: #9aa8a0;
}

.regex-slash,
.regex-flag-text {
    color: #9aa8a0;
    font-size: 1.25rem;
    font-weight: 700;
}

.regex-flag-text {
    min-width: 2ch;
    color: var(--tool-accent);
    font-size: 1.02rem;
}

.regex-flags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.regex-flags label {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 36px;
    padding: 0 0.75rem;
    border: 1px solid var(--tool-line);
    border-radius: 999px;
    background: #ffffff;
    color: var(--tool-muted);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.regex-flags label:hover {
    border-color: #c3dcbb;
    background: var(--tool-soft);
}

.regex-flags label:has(input:checked) {
    border-color: rgba(74, 156, 45, 0.4);
    background: rgba(126, 217, 87, 0.14);
    color: var(--tool-accent);
}

.regex-flags input {
    width: 14px;
    height: 14px;
}

.regex-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 0.9rem;
    margin: 0 0 0.8rem;
    padding: 0;
    list-style: none;
    color: var(--tool-muted);
    font-size: 0.72rem;
    font-weight: 700;
}

.regex-legend li {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
}

.regex-legend li[hidden] {
    display: none;
}

.regex-legend li::before {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.regex-legend .is-match::before { background: rgba(126, 217, 87, 0.75); }
.regex-legend .regex-group-1::before { background: rgba(247, 144, 9, 0.7); }
.regex-legend .regex-group-2::before { background: rgba(158, 119, 237, 0.7); }
.regex-legend .regex-group-3::before { background: rgba(238, 70, 188, 0.6); }
.regex-legend .regex-group-4::before { background: rgba(0, 134, 201, 0.6); }

.regex-flags input {
    accent-color: var(--tool-green-dark);
}

.regex-flags b {
    font-family: Consolas, Monaco, 'Courier New', monospace;
}

.regex-workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1rem;
    align-items: stretch;
    margin-bottom: 1rem;
}

.regex-tool-page .regex-text,
.regex-tool-page .regex-highlight {
    min-height: 300px;
    max-height: 480px;
}

.regex-tool-page .regex-text {
    resize: vertical;
}

.regex-highlight mark {
    padding: 0.05rem 0;
    border-radius: 3px;
    background: rgba(126, 217, 87, 0.38);
    color: #0b2a0c;
    box-shadow: inset 0 -2px 0 rgba(74, 156, 45, 0.6);
}

.regex-highlight mark.alt {
    background: rgba(23, 92, 211, 0.18);
    box-shadow: inset 0 -2px 0 rgba(23, 92, 211, 0.5);
}

.regex-highlight mark.empty {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    vertical-align: text-bottom;
    background: #d92d20;
    box-shadow: none;
}

.regex-group-1 { background: rgba(247, 144, 9, 0.35); }
.regex-group-2 { background: rgba(158, 119, 237, 0.32); }
.regex-group-3 { background: rgba(238, 70, 188, 0.28); }
.regex-group-4 { background: rgba(0, 134, 201, 0.28); }

.regex-highlight .regex-group-1,
.regex-highlight .regex-group-2,
.regex-highlight .regex-group-3,
.regex-highlight .regex-group-4 {
    border-radius: 2px;
}

.regex-match-list {
    display: grid;
    gap: 0.6rem;
    max-height: 420px;
    overflow: auto;
    color: var(--tool-muted);
    font-size: 0.86rem;
}

.regex-match {
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--tool-line);
    border-radius: 10px;
    background: var(--tool-soft);
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.regex-match:hover {
    border-color: #c3dcbb;
    background: #ffffff;
}

.regex-match header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
    color: var(--tool-ink);
    font-size: 0.8rem;
    font-weight: 800;
}

.regex-match header small {
    color: var(--tool-muted);
    font-weight: 600;
}

.regex-match code,
.regex-match dd {
    font-family: Consolas, Monaco, 'Courier New', monospace;
    font-size: 0.82rem;
    overflow-wrap: anywhere;
}

.regex-match > code {
    display: block;
    color: #101828;
}

.regex-match dl {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 0.25rem 0.75rem;
    margin: 0.5rem 0 0;
}

.regex-match dt {
    padding: 0 0.4rem;
    border-radius: 4px;
    color: var(--tool-ink);
    font-size: 0.76rem;
    font-weight: 800;
}

.regex-match dd {
    margin: 0;
    color: var(--tool-text);
}

.regex-match dd.undefined {
    color: var(--tool-muted);
    font-style: italic;
}

.regex-tool-page .regex-replace-output {
    min-height: 220px;
    max-height: 380px;
    margin-top: 0.85rem;
}

@media (max-width: 1020px) {
    .regex-workspace {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .regex-preset-field {
        min-width: 0;
        width: 100%;
    }
}