/* ==========================================================================
   Bottom Mobile Navigation Bar
   ========================================================================== */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 40;
  height: calc(62px + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background-color: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid var(--border-subtle);
}

.bottom-nav-inner {
  max-width: 640px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0.4rem 0.5rem;
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  padding: 0.4rem 0.25rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-tab:hover {
  color: var(--text-primary);
}

.nav-tab.active {
  color: var(--accent-primary);
  background-color: var(--accent-primary-soft);
}

.nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  line-height: 1;
}

.nav-svg-icon {
  width: 1.2rem;
  height: 1.2rem;
  stroke: currentColor;
  transition: transform 0.15s ease;
}

.nav-tab.active .nav-svg-icon {
  transform: translateY(-1px);
}