.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 64px;
  background: #fff;
  border-top: 1px solid #ddd;
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 9999;
}

.bottom-nav a {
  flex: 1;
  text-align: center;
  color: #666;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px 0;
  position: relative;
  transition: background 0.2s, color 0.2s;
}

.bottom-nav a i {
  font-size: 22px;
  margin-bottom: 2px;
}

.bottom-nav a span {
  font-size: 13px;
  line-height: 1.2;
}

.bottom-nav a.active {
  color: #c62828;
  font-weight: 600;
}

.bottom-nav a:hover {
  background: #f9f9f9;
}

/* Badge thông báo */
.badge {
  position: absolute;
  top: 4px;
  right: 24px;
  background: #c62828;
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  border-radius: 12px;
  padding: 2px 6px;
  display: none;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .bottom-nav { height: 70px; }
  .bottom-nav a i { font-size: 26px; }
  .bottom-nav a span { font-size: 12px; }
}

@media (min-width: 768px) {
  .bottom-nav { height: 80px; }
  .bottom-nav a i { font-size: 28px; }
  .bottom-nav a span { font-size: 14px; }
}

@media (min-width: 1024px) {
  .bottom-nav { height: 60px; }
  .bottom-nav a i { font-size: 20px; }
  .bottom-nav a span { font-size: 13px; }
}