/* ================================================================
   系统架构导览 / 新手引导 样式
   ================================================================ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .55);
  display: flex; align-items: center; justify-content: center; z-index: 1000;
  backdrop-filter: blur(2px);
}
.onboarding-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); width: min(760px, 92vw); max-height: 86vh;
  display: flex; flex-direction: column; box-shadow: var(--shadow); overflow: hidden;
}
.onboarding-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; border-bottom: 1px solid var(--border);
}
.onboarding-header h2 { margin: 0; font-size: 18px; color: var(--text-primary); }
.modal-close {
  background: none; border: none; color: var(--text-muted); font-size: 24px;
  cursor: pointer; line-height: 1; padding: 0 6px;
}
.modal-close:hover { color: var(--text-primary); }
.onboarding-body { padding: 18px 22px; overflow-y: auto; }
.onboarding-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; border-top: 1px solid var(--border);
}
.onboarding-dont {
  font-size: 13px; color: var(--text-secondary); display: flex;
  align-items: center; gap: 6px; cursor: pointer;
}

.ob-section { margin-bottom: 22px; }
.ob-section:last-child { margin-bottom: 0; }
.ob-section h3 { font-size: 14px; color: var(--accent); margin: 0 0 12px; }

.ob-hierarchy { display: flex; flex-direction: column; align-items: center; }
.ob-level {
  width: 100%; max-width: 480px; text-align: center; padding: 14px 18px;
  border-radius: var(--radius); border: 1px solid var(--border);
}
.ob-level b { display: block; font-size: 15px; color: var(--text-primary); }
.ob-level span { font-size: 12px; color: var(--text-muted); }
.ob-gov { background: linear-gradient(135deg, var(--accent-bg), transparent); border-color: var(--accent); }
.ob-orch { background: var(--bg-input); }
.ob-agent { background: var(--bg-input); }
.ob-arrow { font-size: 12px; color: var(--accent); padding: 6px 0; }

.ob-note {
  font-size: 13px; color: var(--text-secondary); line-height: 1.7;
  margin: 12px 0 0; background: var(--bg-input); padding: 10px 14px; border-radius: var(--radius);
}

.ob-cats { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 10px; }
.ob-cat { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; }
.ob-cat-icon { font-size: 20px; }
.ob-cat-label { font-size: 13px; font-weight: 600; color: var(--text-primary); margin: 4px 0 2px; }
.ob-cat-desc { font-size: 11px; color: var(--text-muted); line-height: 1.5; }

.ob-nav { margin: 0; padding-left: 18px; }
.ob-nav li { font-size: 13px; color: var(--text-secondary); line-height: 1.9; }
.ob-nav b { color: var(--text-primary); }