/* BottomNav — mobile bottom navigation */

.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-h);
  padding-bottom: var(--safe-area-bottom);
  background: var(--bg-secondary);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 300;
  align-items: stretch;
  justify-content: space-around;
}

@media (max-width: 768px) {
  .bottom-nav {
    display: flex;
  }
}

/* Primary nav items */
.bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  min-width: 48px;
  min-height: 48px;
  gap: 3px;
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.18s var(--ease-out);
  -webkit-tap-highlight-color: transparent;
  outline: none;
  border: none;
  background: none;
  cursor: pointer;
  padding: 4px 2px;
}

.bottom-nav__item:hover,
.bottom-nav__item.is-active,
.bottom-nav__item--active {
  color: var(--neon-cyan);
}

.bottom-nav__item:hover .bottom-nav__icon,
.bottom-nav__item.is-active .bottom-nav__icon,
.bottom-nav__item--active .bottom-nav__icon {
  filter: drop-shadow(0 0 6px var(--neon-cyan-dim));
}

/* Icon wrapper */
.bottom-nav__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  transition: filter 0.18s var(--ease-out);
}

.bottom-nav__icon svg,
.bottom-nav__icon > * {
  width: 22px;
  height: 22px;
}

/* Label */
.bottom-nav__label {
  line-height: 1;
  white-space: nowrap;
}

/* ---- More overlay backdrop ---- */
.bottom-nav__more-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 298;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s var(--ease-out);
}

.bottom-nav__more-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* ---- More panel ---- */
.bottom-nav__more-panel {
  position: fixed;
  bottom: calc(var(--bottom-nav-h) + var(--safe-area-bottom));
  left: 0;
  right: 0;
  z-index: 299;
  padding: 16px 12px 12px;
  background: var(--surface-raised);
  border-top: 1px solid var(--line);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  transform: translateY(100%);
  transition: transform 0.25s var(--ease-out);
}

.bottom-nav__more-panel.is-open {
  transform: translateY(0);
}

/* More panel item */
.bottom-nav__more-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 4px;
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
}

.bottom-nav__more-item:hover,
.bottom-nav__more-item.is-active {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan-dim);
}

.bottom-nav__more-item:hover .bottom-nav__icon,
.bottom-nav__more-item.is-active .bottom-nav__icon {
  filter: drop-shadow(0 0 6px var(--neon-cyan-dim));
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .bottom-nav__item,
  .bottom-nav__icon,
  .bottom-nav__more-overlay,
  .bottom-nav__more-panel,
  .bottom-nav__more-item {
    transition: none;
  }
}
