.tab-bar {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  position: relative;
  display: flex;
  background: #fff;
  padding: 10px;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  width: 300px;
  margin: 0 auto;
  justify-content: space-around;
  border: 1px solid #f3f4f6;
}
.tab-item {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #9ca3af;
  z-index: 2;
  transition: color 0.3s;
}
.tab-item.active {
  color: #2563eb;
}
.indicator {
  position: absolute;
  top: 10px;
  left: 22px;
  width: 50px;
  height: 50px;
  background: #eff6ff;
  border-radius: 12px;
  z-index: 1;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
/* Logic to move indicator based on sibling count */
.tab-item:nth-child(1).active ~ .indicator { transform: translateX(0); }
.tab-item:nth-child(2).active ~ .indicator { transform: translateX(75px); }
.tab-item:nth-child(3).active ~ .indicator { transform: translateX(150px); }
.tab-item:nth-child(4).active ~ .indicator { transform: translateX(225px); }

const tabs = document.querySelectorAll(".tab-item");

tabs.forEach(tab => {
  tab.addEventListener("click", (e) => {
    e.preventDefault();
    tabs.forEach(t => t.classList.remove("active"));
    tab.classList.add("active");
  });
});