/* Top navigation. Intentionally LIGHT (white) even though the page body
   is dark — see --nav-* tokens in /_shared/theme.css.
   No raw colors here; everything comes from the token system. */
.vr-nav-shell {
  position: sticky;
  top: 0;
  z-index: 999;
  /* Push the sticky header below the iPhone notch / Dynamic Island when
     the page is in landscape or installed as a PWA. Falls back to 0 on
     browsers/devices without safe-area support. */
  padding-top: env(safe-area-inset-top, 0);
  background: var(--nav-bg);
}
.vr-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  border-bottom: 1px solid var(--nav-border);
  background: var(--nav-bg);
  font-family: var(--vr-font-sans);
  position: relative;
}
.vr-nav .nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--nav-text);
}
.vr-nav .nav-brand-mark {
  display: block;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  flex-shrink: 0;
}
.vr-nav .nav-brand .nm {
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -.02em;
  color: var(--nav-text);
}
.vr-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.vr-nav .nav-links a {
  text-decoration: none;
  color: var(--nav-text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color .15s;
}
.vr-nav .nav-links a:hover { color: var(--nav-text); }
/* "You are here" — applied by nav.js. Underline with brand accent.
   Excluded from .btn-nav by class check in JS, but :not() guards the
   pseudo-element against ever painting a stray bar under the CTA pill. */
.vr-nav .nav-links a.is-current:not(.btn-nav) { color: var(--nav-text); position: relative; }
.vr-nav .nav-links a.is-current:not(.btn-nav)::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.vr-nav-drawer a.is-current:not(.drawer-cta) { color: var(--accent); font-weight: 600; }
.vr-nav .btn-nav,
.vr-nav .nav-links a.btn-nav {
  background: var(--accent);
  color: var(--vr-btn-fg);
  padding: 12px 24px;
  border-radius: 0;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.15px;
  text-decoration: none;
  transition: var(--vr-transition);
}
.vr-nav .btn-nav:hover,
.vr-nav .nav-links a.btn-nav:hover { background: var(--accent-hov); }
/* ─── Mega-menu under "Learn" ─── */
.vr-nav .vr-nav-item { position: relative; display: inline-flex; align-items: center; }
.vr-nav .vr-nav-item > a { display: inline-flex; align-items: center; gap: 4px; }
.vr-nav .vr-caret { font-size: 10px; line-height: 1; color: var(--nav-text-faint); transition: transform .15s, color .15s; }
.vr-nav .vr-mega-open .vr-caret { transform: rotate(180deg); color: var(--nav-text); }
.vr-nav .vr-mega {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  border-radius: 12px;
  box-shadow: var(--nav-shadow-md);
  padding: 24px 28px 18px;
  min-width: 760px;
  z-index: 1000;
}
.vr-nav .vr-mega::before {
  content: '';
  position: absolute;
  top: -7px; left: 50%;
  width: 14px; height: 14px;
  background: var(--nav-bg);
  border-left: 1px solid var(--nav-border);
  border-top: 1px solid var(--nav-border);
  transform: translateX(-50%) rotate(45deg);
}
.vr-mega-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}
.vr-mega-col h4 {
  margin: 0 0 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--nav-text-faint);
  font-weight: 700;
}
.vr-mega-col ul { list-style: none; padding: 0; margin: 0; }
.vr-mega-col li { margin: 0; }
.vr-mega-col a {
  display: block;
  padding: 6px 8px;
  margin: 0 -8px;
  border-radius: 6px;
  color: var(--nav-text);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.35;
  transition: background .12s, color .12s;
}
.vr-mega-col a:hover { background: var(--nav-bg-hov); color: var(--accent); }
.vr-mega-foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--nav-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.vr-mega-all {
  color: var(--nav-text);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}
.vr-mega-all:hover { color: var(--accent); }
.vr-mega-search {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--nav-bg-hov);
  border: 1px solid var(--nav-border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--nav-text-muted);
  cursor: pointer;
  font-family: inherit;
  transition: background .12s, color .12s;
}
.vr-mega-search:hover { background: var(--nav-bg); color: var(--nav-text); border-color: var(--nav-border-hov); }
.vr-mega-search kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--nav-text);
}

/* ─── Hamburger button (hidden on desktop) ─── */
.vr-nav-hamburger {
  display: none;
  background: none;
  border: none;
  /* 10 + 24 + 10 = 44px hit target — meets iOS HIG 44×44 minimum.
     Negative margin keeps the visual nav padding unchanged. */
  padding: 10px;
  margin: -4px;
  cursor: pointer;
  color: var(--nav-text);
  line-height: 0;
  touch-action: manipulation;
}
.vr-nav-hamburger svg { width: 24px; height: 24px; }

/* ─── Mobile drawer ─── */
.vr-nav-drawer {
  display: none;
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: min(360px, 85vw);
  background: var(--nav-bg);
  z-index: 2000;
  /* Top padding clears the notch in landscape / standalone PWA;
     bottom padding clears the home indicator. */
  padding: max(20px, calc(env(safe-area-inset-top) + 12px))
           max(24px, env(safe-area-inset-right))
           max(20px, calc(env(safe-area-inset-bottom) + 12px))
           24px;
  overflow-y: auto;
  box-shadow: var(--nav-shadow-lg);
  transform: translateX(100%);
  transition: transform .25s cubic-bezier(.4,0,.2,1);
  flex-direction: column;
  gap: 0;
}
.vr-nav-drawer.is-open {
  display: flex;
  transform: translateX(0);
}
.vr-nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--backdrop);
  z-index: 1999;
  opacity: 0;
  transition: opacity .25s;
}
.vr-nav-backdrop.is-open {
  display: block;
  opacity: 1;
}
.vr-nav-drawer-close {
  align-self: flex-end;
  background: none;
  border: none;
  /* 12 + 20 + 12 = 44×44 hit target. Negative margin re-aligns the
     visual edge with the drawer's padding, so the icon still looks
     like it sits at the corner. */
  padding: 12px;
  margin: -8px -8px 4px;
  cursor: pointer;
  color: var(--nav-text-muted);
  line-height: 0;
  touch-action: manipulation;
}
.vr-nav-drawer-close:hover { color: var(--nav-text); }
.vr-nav-drawer-close svg { width: 20px; height: 20px; }
.vr-nav-drawer a {
  display: block;
  padding: 12px 0;
  color: var(--nav-text);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  border-bottom: 1px solid var(--nav-border);
}
.vr-nav-drawer a:last-child { border-bottom: none; }
.vr-nav-drawer a:hover { color: var(--accent); }
.vr-nav-drawer .drawer-section-label {
  display: block;
  padding: 16px 0 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--nav-text-faint);
  font-weight: 700;
  border-bottom: none;
}
.vr-nav-drawer .drawer-cta {
  display: block;
  margin-top: 16px;
  padding: 12px 0;
  text-align: center;
  background: var(--accent);
  color: var(--c-white);
  border-radius: 6px;
  font-weight: 600;
  font-size: 15px;
  border-bottom: none;
}
.vr-nav-drawer .drawer-cta:hover { background: var(--accent-hov); }
/* ─── Drawer accordion (details/summary) ─── */
.vr-nav-drawer .drawer-group {
  border-bottom: 1px solid var(--nav-border);
}
.vr-nav-drawer .drawer-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--nav-text);
  cursor: pointer;
  list-style: none;
}
.vr-nav-drawer .drawer-group summary::-webkit-details-marker { display: none; }
.vr-nav-drawer .drawer-group summary::after {
  content: '\25B8';
  font-size: 12px;
  color: var(--nav-text-faint);
  transition: transform .2s;
}
.vr-nav-drawer .drawer-group[open] summary::after {
  transform: rotate(90deg);
}
.vr-nav-drawer .drawer-sub {
  padding: 0 0 8px 12px;
}
.vr-nav-drawer .drawer-sub a {
  padding: 8px 0;
  font-size: 14px;
  border-bottom: none;
}
.vr-nav-drawer .drawer-sub .drawer-section-label {
  padding: 10px 0 4px;
  font-size: 13px;
}
.vr-nav-drawer .drawer-view-all {
  padding: 10px 0 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  border-bottom: none;
}

@media (max-width: 850px) {
  .vr-nav { padding: 14px 16px; }
  .vr-nav .nav-links { display: none; }
  .vr-nav-hamburger { display: block; }
  .vr-nav .vr-mega { display: none !important; }
}

/* On touch devices the :hover state sticks after a tap until the next
   element is tapped — strip transforms/shadows so taps don't leave
   buttons looking permanently "hovered". */
@media (hover: none) {
  .vr-nav .btn-nav:hover,
  .vr-nav .nav-links a.btn-nav:hover { transform: none; }
  .vr-nav-drawer .drawer-cta:hover { background: var(--accent); }
}