/* =============================================================
   BOTTOM NAV
   ============================================================= */
#bottomnav {
  /* Real-Flow-Flex-Item (kein position:fixed mehr). Sitzt als letztes
     Flex-Child in body { display:flex; flex-direction:column } automatisch
     am Viewport-Boden. Damit verschwindet die ganze Klasse von iOS-PWA-
     Bugs, in denen position:fixed beim Scrollen, App-Resume oder
     Orientierungswechsel kurzzeitig „mitwandert". */
  flex-shrink: 0;
  display: flex; justify-content: space-around; align-items: center;
  background: var(--surface);
  border-top: 1px solid var(--border);
  /* Feste Hoehe = 62px Button-Zone + Home-Indicator-Safe-Area. Mit
     box-sizing:border-box reserviert padding-bottom die Safe-Area-Zone
     fuer den Hintergrund (kein „schwarzer Balken" unter der Navbar) und
     laesst die 62px Button-Zone unangetastet (Icons rutschen auf Notch-
     Geraeten nicht aus der Leiste raus).                                  */
  height: calc(62px + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
}
.nav-btn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: var(--s-2) var(--s-4); color: var(--muted);
  transition: color var(--dur-base) var(--ease);
  position: relative;
}
.nav-btn.active { color: var(--primary); }
.nav-btn.active::after {
  content: ''; position: absolute; bottom: 0; left: 50%;
  width: 20px; height: 3px; background: var(--primary);
  border-radius: var(--r-full) var(--r-full) 0 0;
  transform: translateX(-50%) scaleX(1);
  transform-origin: center;
  animation: nav-bar 260ms var(--ease-spring) both;
}
@keyframes nav-bar {
  from { transform: translateX(-50%) scaleX(0); }
  to   { transform: translateX(-50%) scaleX(1); }
}
.nav-btn.active .nav-icon {
  animation: nav-pop 300ms var(--ease-spring);
}
@keyframes nav-pop {
  0%   { transform: scale(1); }
  45%  { transform: scale(1.22); }
  100% { transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .nav-btn.active::after,
  .nav-btn.active .nav-icon { animation: none; }
}
/* Nav-Icons: SVG statt Emoji -> pixelgenau zentriert, faerbt sich via
   currentColor automatisch mit, passt zum Slab-Serif-Design. */
.nav-icon-wrap {
  position: relative;
  display: inline-flex;
  line-height: 0;
}
.nav-icon {
  display: block;
  width: 22px; height: 22px;
  stroke: currentColor;
  flex-shrink: 0;
  transition: transform var(--dur-fast) var(--ease);
}
.nav-label {
  font-family: var(--font-display);
  font-size: var(--fs-micro); letter-spacing: var(--tracking-wide); text-transform: uppercase;
}
.nav-badge {
  position: absolute;
  top: -6px; right: -10px;
  min-width: 16px; height: 16px;
  padding: 0 4px;
  background: #ef4444;
  color: #fff;
  font-family: var(--font-display);
  font-size: 10px; font-weight: 800;
  line-height: 1;
  border-radius: var(--r-full);
  display: flex; align-items: center; justify-content: center;
  font-variant-numeric: tabular-nums;
  box-shadow: 0 0 0 2px var(--bg);
  transform-origin: center;
}
.nav-badge[hidden] { display: none; }
.nav-badge.pop { animation: nav-badge-pop 360ms var(--ease-spring); }
@keyframes nav-badge-pop {
  0%   { transform: scale(0); }
  55%  { transform: scale(1.25); }
  100% { transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .nav-badge.pop { animation: none; }
}