.conv { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r);
  padding: 22px; margin: 0 0 18px; box-shadow: var(--shadow-sm) }
.conv h3 { margin: 0 0 16px; font-size: 16px; display: flex; align-items: center; gap: 9px }
.conv h3::before { content: ""; width: 6px; height: 18px; border-radius: 3px; background: var(--accent) }

.subnet-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; align-items: center }

.subnet-error { color: var(--danger, #c0392b); font-size: 14px; margin: 12px 0 0; font-weight: 500 }