.research-workspace {
  margin-top: 2rem;
}

.research-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.55rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
  background: var(--surface-2);
}

.research-toolbar label,
.research-assistant label {
  display: grid;
  gap: 0.3rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 650;
}

.research-toolbar select {
  width: min(360px, 48vw);
}

.research-evidence-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-top: 0;
  background: var(--surface);
}

.research-evidence-rail > div {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
  padding: 0.75rem 0.85rem;
  border-right: 1px solid var(--line);
}

.research-evidence-rail > div:last-child {
  border-right: 0;
}

.research-evidence-rail span {
  color: var(--muted);
  font-size: 0.68rem;
}

.research-evidence-rail strong {
  overflow-wrap: anywhere;
  font-size: 0.76rem;
}

.research-evidence-rail .is-pinned strong {
  color: var(--green);
}

.research-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 2.2fr);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.research-route,
.research-step {
  min-width: 0;
  margin: 0;
  padding: 1rem;
  background: var(--surface);
}

.research-route {
  border-right: 1px solid var(--line);
  background: var(--surface-2);
}

.research-route h3,
.research-step h3 {
  margin: 0.25rem 0 0.5rem;
  font-size: 1.1rem;
}

.research-step-list {
  display: grid;
  gap: 0.45rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.research-step-list button {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  width: 100%;
  padding: 0.7rem;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--surface);
}

.research-step-list button:hover,
.research-step-list button[aria-current="step"] {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.research-step-list button > span {
  grid-row: 1 / 3;
  color: var(--accent);
  font: 700 0.7rem var(--font-code);
}

.research-step-list button strong {
  overflow-wrap: anywhere;
  font-size: 0.76rem;
}

.research-step-list button small {
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.62rem;
}

.research-step-head,
.research-assistant-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.research-formula {
  margin: 1rem 0;
  padding: 1rem;
  overflow-x: auto;
  border-left: 4px solid var(--rigorous);
  background: var(--surface-2);
}

.research-source-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 0.8rem;
}

.research-source-grid > div {
  min-width: 0;
  padding: 0.75rem;
  border: 1px solid var(--line);
}

.research-source-grid dt {
  color: var(--muted);
  font-size: 0.67rem;
  font-weight: 700;
  text-transform: uppercase;
}

.research-source-grid dd {
  margin: 0.35rem 0 0;
  overflow-wrap: anywhere;
  font-size: 0.76rem;
}

.research-lean-support {
  margin-top: 1rem;
  border: 1px solid var(--line);
}

.research-lean-support summary {
  padding: 0.75rem;
  cursor: pointer;
  font-weight: 700;
}

.research-lean-support > div {
  padding: 0 0.75rem 0.75rem;
}

.research-lean-support code {
  overflow-wrap: anywhere;
}

.research-ledger,
.research-assistant {
  margin: 1.25rem 0;
  padding: 1rem;
  border: 1px solid var(--line);
  background: var(--surface);
}

.research-ledger[hidden] {
  display: none;
}

.research-ledger-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  gap: 1rem;
}

.research-ledger table {
  min-width: 720px;
  font-size: 0.7rem;
}

.research-error-flow {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.research-error-flow li {
  padding: 0.7rem;
  border-left: 3px solid var(--orange);
  background: var(--orange-soft);
}

.research-error-flow h4,
.research-error-flow p {
  margin: 0;
}

.research-error-flow p {
  margin-top: 0.35rem;
  font-size: 0.72rem;
}

.research-error-flow .ledger-charge {
  font-weight: 700;
}

.research-action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0;
}

.research-assistant textarea {
  width: 100%;
  padding: 0.7rem;
  color: var(--ink);
  border: 1px solid var(--line);
  background: var(--paper);
  resize: vertical;
}

.research-answer {
  min-height: 150px;
  max-height: 520px;
  margin-top: 0.8rem;
  padding: 0.9rem;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  border: 1px solid var(--line);
  background: var(--paper);
  font-size: 0.78rem;
}

@media (max-width: 900px) {
  .research-grid,
  .research-ledger-grid {
    grid-template-columns: 1fr;
  }

  .research-route {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .research-evidence-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .research-evidence-rail > div:nth-child(2) {
    border-right: 0;
  }
}

@media (max-width: 620px) {
  .research-toolbar,
  .research-step-head,
  .research-assistant-head {
    align-items: stretch;
    flex-direction: column;
  }

  .research-toolbar select,
  .research-toolbar label,
  .research-toolbar .button,
  .research-toolbar button {
    width: 100%;
  }

  .research-evidence-rail,
  .research-source-grid {
    grid-template-columns: 1fr;
  }

  .research-evidence-rail > div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}