/* 流程图可展开块 */
.flow-section {
  margin: 0 0 20px;
  padding: 18px 18px 8px;
  background: #fff;
  border: 1px solid var(--nav-line);
  border-radius: 12px;
}

.flow-section > h2 {
  margin: 0 0 6px;
  font-size: 17px;
}

.flow-section > .flow-lead {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--nav-muted);
  line-height: 1.55;
}

.flow-details {
  border: 1px solid var(--nav-line);
  border-radius: 10px;
  margin-bottom: 12px;
  background: #f8fafc;
  overflow: hidden;
}

.flow-details[open] {
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.flow-details summary {
  cursor: pointer;
  list-style: none;
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}

.flow-details summary::-webkit-details-marker {
  display: none;
}

.flow-details summary::before {
  content: "▸";
  color: var(--nav-accent);
  font-size: 12px;
  width: 14px;
  flex-shrink: 0;
  transition: transform 160ms ease;
}

.flow-details[open] summary::before {
  transform: rotate(90deg);
}

.flow-details summary .flow-tag {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
  padding: 2px 8px;
  border-radius: 999px;
}

.flow-details .flow-body {
  padding: 0 14px 14px;
  border-top: 1px dashed var(--nav-line);
}

.flow-details .flow-note {
  margin: 10px 0 8px;
  font-size: 12px;
  color: var(--nav-muted);
  line-height: 1.55;
}

.flow-details .mermaid {
  background: #f8fafc;
  border-radius: 8px;
  padding: 12px 8px;
  overflow-x: auto;
  font-size: 13px;
}

.flow-details .flow-legend {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 12px;
  color: var(--nav-muted);
  line-height: 1.55;
}

.nav-hero__links a[href="#flows"] {
  background: rgba(255, 255, 255, 0.28);
}