.mobile-nav {
  display: none;
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  padding: 8px 0 max(8px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, .95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.mobile-nav-inner {
  display: flex;
  justify-content: space-around;
  max-width: 480px;
  margin: 0 auto;
}
.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 16px;
  color: var(--muted);
  font: inherit;
  font-size: .7rem;
  transition: color .15s;
}
.mobile-nav-btn.active { color: var(--text); }
.mobile-nav-btn svg { width: 22px; height: 22px; stroke-width: 1.5; }
@media (max-width: 640px) {
  .mobile-nav { display: block; }
  body { padding-bottom: 80px; }
}
@media (max-width: 500px) {
  .mobile-nav-btn { padding-right: 10px; padding-left: 10px; }
}