.diagram-nav {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 9999;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.diagram-nav-link,
.diagram-nav-button {
  border: 1px solid rgba(15, 118, 110, 0.22);
  border-radius: 999px;
  padding: 9px 14px;
  background: rgba(255, 250, 240, 0.92);
  color: #0f766e;
  text-decoration: none;
  font: 600 13px/1 "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  box-shadow: 0 12px 28px rgba(31, 41, 55, 0.10);
  backdrop-filter: blur(10px);
}

.diagram-nav-button {
  cursor: pointer;
}

.diagram-nav-link:hover,
.diagram-nav-button:hover {
  background: rgba(240, 253, 250, 0.98);
  border-color: rgba(15, 118, 110, 0.48);
}

@media (max-width: 720px) {
  .diagram-nav {
    top: 12px;
    right: 12px;
    left: 12px;
  }

  .diagram-nav-link,
  .diagram-nav-button {
    padding: 10px 12px;
    font-size: 12px;
  }
}