.page.chain {
  flex-direction: column;
  align-items: center;
  height: 100vh;
  padding: 0;
}
.chain-content {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px 20px;
  width: 100%;
  max-width: 500px;
}
.msg {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 14px 0;
  font-size: 0.95em;
  line-height: 1.45;
}