/* ── BOTTOM NAV ── */
.bb-nav {
  position:fixed;
  bottom:0;
  left:0;
  right:0;
  z-index:50;
  display:flex;
  align-items:stretch;
  justify-content:center;
  transform:translateY(100%);
  transition:transform 0.8s cubic-bezier(0.16,1,0.3,1);
  height:52px;
  pointer-events:none;
  opacity:0;
}
.bb-nav.vis {
  transform:translateY(0);
  pointer-events:all;
  opacity:1;
}

.bb-nav-inner {
  display:flex;
  align-items:stretch;
  width:100%;
  max-width:1200px;
  border-top:1px solid var(--nav-border);
  background:var(--nav-bg);
  backdrop-filter:blur(8px);
}

.bb-nav-item {
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:'Space Mono', monospace;
  font-size:9px;
  font-weight:700;
  letter-spacing:0.28em;
  text-transform:uppercase;
  text-decoration:none;
  color:var(--nav-color);
  border-right:1px solid var(--nav-border);
  transition:background 0.2s ease, color 0.2s ease;
  cursor:pointer;
  white-space:nowrap;
  padding:0 8px;
  position:relative;
}
.bb-nav-item:last-child { border-right:none; }
.bb-nav-item:hover {
  background:var(--nav-hover-bg);
  color:var(--nav-hover-color);
}
.bb-nav-item.active {
  color:var(--nav-active-color);
  background:var(--nav-active-bg);
}
.bb-nav-item.active::before {
  content:'';
  position:absolute;
  top:0; left:0; right:0;
  height:2px;
  background:var(--nav-active-color);
}

.bb-nav-dot {
  display:inline-block;
  width:4px; height:4px;
  border-radius:50%;
  background:var(--nav-active-color);
  margin-right:8px;
  opacity:0;
  transition:opacity 0.2s;
}
.bb-nav-item.active .bb-nav-dot,
.bb-nav-item:hover .bb-nav-dot { opacity:1; }