/* Learn / FAQ sub-navigation. Tokens from /_shared/theme.css. */
.vr-subnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: 10px 24px;
  font-family: var(--vr-font-sans);
  font-size: 14px;
}
.vr-subnav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: nowrap;
}
.vr-subnav-crumb {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
}
.vr-subnav-crumb:hover { color: var(--heading); }
.vr-subnav-crumb svg { width: 14px; height: 14px; }
.vr-subnav-sep { color: var(--faint); }
.vr-subnav-topic {
  position: relative;
}
.vr-subnav-topic-btn {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 6px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--heading);
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 0 1 auto;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}
.vr-subnav-topic-btn:hover { border-color: var(--border-strong); }
.vr-subnav-topic-btn .caret { font-size: 10px; color: var(--faint); }
.vr-subnav-topic-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 320px;
  max-height: 60vh;
  overflow-y: auto;
  z-index: 60;
  white-space: nowrap;
}
.vr-subnav-topic-panel ul { list-style: none; padding: 0; margin: 0; }
.vr-subnav-topic-panel li > a {
  display: block;
  padding: 6px 10px;
  border-radius: 5px;
  color: var(--body);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.35;
}
.vr-subnav-topic-panel li > a:hover { background: var(--surface-hov); color: var(--accent-hov); }
.vr-subnav-topic-panel li.is-current > a { background: var(--accent-soft); color: var(--accent-hov); font-weight: 600; }
.vr-subnav-topic-panel .group-label {
  display: block;
  padding: 10px 10px 4px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--faint);
  font-weight: 700;
}
.vr-subnav-spacer { flex: 1; }
.vr-subnav-arrows { display: inline-flex; gap: 6px; align-items: center; }
.vr-subnav-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  border-radius: 6px;
  color: var(--body);
  font-size: 13px;
  text-decoration: none;
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.vr-subnav-arrow:hover { border-color: var(--border-strong); color: var(--accent-hov); }
.vr-subnav-arrow.is-disabled { opacity: .4; pointer-events: none; }
.vr-subnav-arrow .lbl { display: inline; }
@media (max-width: 850px) {
  .vr-subnav { padding: 8px 12px; }
  .vr-subnav-inner { gap: 8px; }
  .vr-subnav-topic-btn { flex: 1 1 0; min-width: 0 !important; max-width: calc(100vw - 140px); }
  .vr-subnav-arrow .lbl { display: none; }
  .vr-subnav-arrow { padding: 6px 8px; }
  .vr-subnav-topic-panel {
    position: fixed;
    left: 8px;
    right: 8px;
    top: auto;
    min-width: 0;
    max-width: none;
    white-space: normal;
  }
}
@media (max-width: 480px) {
  .vr-subnav { padding: 6px 10px; }
  .vr-subnav-inner { gap: 6px; }
  .vr-subnav-crumb { font-size: 0; gap: 0; padding: 0; }
  .vr-subnav-crumb svg { width: 18px; height: 18px; }
  .vr-subnav-sep { display: none; }
  .vr-subnav-topic-btn { font-size: 13px; padding: 5px 10px; }
  .vr-subnav-arrows { gap: 4px; }
  .vr-subnav-arrow { padding: 5px 6px; font-size: 12px; }
}