.bn-scenario-grid {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
}

.bn-scenario-grid button {
  text-align: left;
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  font: inherit;
}

.bn-scenario-grid button:hover,
.bn-scenario-grid button.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.bn-scenario-grid .title {
  display: block;
  font-weight: 650;
  font-size: 0.9rem;
}

.bn-scenario-grid .meta {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.bn-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.bn-toolbar .btn {
  font-family: var(--mono);
  font-size: 0.82rem;
}

.bn-meta {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.bn-meta strong {
  color: var(--ink);
  font-weight: 600;
}

.bn-poke-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: end;
  margin: 0.5rem 0 0.75rem;
}

.bn-field label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.bn-field input {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  min-width: 4.5rem;
}

.bn-compare {
  display: grid;
  gap: 1rem;
}

@media (min-width: 860px) {
  .bn-compare {
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
  }
}

.bn-col .panel {
  height: 100%;
}

.bn-col-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.35rem;
}

.bn-col-label code {
  font-size: 0.95rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink);
}

.bn-sigs {
  display: grid;
  gap: 0.35rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  margin: 0.65rem 0;
}

.bn-sig {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0.5rem;
  align-items: center;
  padding: 0.4rem 0.55rem;
  background: var(--surface2);
  border-radius: 8px;
  border: 1px solid transparent;
}

.bn-sig .name {
  font-weight: 600;
  color: var(--accent);
}

.bn-sig .bits {
  letter-spacing: 0.08em;
}

.bn-sig.is-diff {
  border-color: var(--signal);
  background: var(--warn-bg);
}

.bn-code {
  margin: 0.5rem 0 0;
  padding: 0.65rem 0.75rem;
  background: var(--term-bg);
  color: var(--term-fg);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.45;
  overflow-x: auto;
  white-space: pre;
}

.bn-outcome {
  margin: 0.75rem 0 0;
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  background: var(--surface2);
  border-left: 3px solid var(--accent);
  font-size: 0.92rem;
}

.bn-outcome strong {
  display: block;
  margin-bottom: 0.25rem;
}

.bn-msg {
  font-size: 0.9rem;
  margin: 0.5rem 0 0;
}

.bn-msg.ok {
  color: var(--ok);
}

.bn-msg.err {
  color: var(--err);
}

.bn-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.35rem 0 0;
}

.bn-chal-catalog {
  display: grid;
  gap: 0.35rem;
  margin: 0.5rem 0 0.75rem;
  max-height: 11rem;
  overflow-y: auto;
}

.bn-chal-item {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  text-align: left;
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  cursor: pointer;
  font: inherit;
}

.bn-chal-item:hover,
.bn-chal-item.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.bn-chal-item.is-cleared .bn-chal-mark {
  color: var(--ok);
}

.bn-chal-mark {
  font-family: var(--mono);
  flex-shrink: 0;
}

.bn-chal-title {
  display: block;
  font-weight: 650;
  font-size: 0.88rem;
}

.bn-chal-meta {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.1rem;
}

.bn-chal-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.bn-chal-head h2 {
  margin: 0;
}

.bn-chal-progress {
  font-size: 0.85rem;
  color: var(--muted);
}