<form class="csb-caret" role="search">
  <label class="csb-sr" for="csb-caret-i">Search</label>
  <input id="csb-caret-i" type="search" name="q" placeholder="Search collections..." />
</form>

.csb-caret {
  position: relative; display: inline-block;
  overflow: hidden;
  border-radius: 10px;
}
.csb-caret input {
  display: block; width: 240px;
  padding: 11px 14px;
  background: #1a1a28;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  color: #f0eeff; font: 500 14px/1 system-ui, sans-serif;
  outline: none;
  transition: border-color 0.2s;
}
.csb-caret input::placeholder { color: #b8b6d4; }
.csb-caret:focus-within input { border-color: #7c6cff; }
.csb-caret::after {
  content: ''; position: absolute;
  left: 0; bottom: 0;
  height: 2px; width: 100%;
  background: linear-gradient(90deg, transparent, #7c6cff 40%, #ff6c8a 60%, transparent);
  transform: translateX(-100%);
  pointer-events: none;
}
.csb-caret:focus-within::after {
  animation: csb-caret-sweep 0.7s cubic-bezier(0.65,0,0.35,1) forwards;
}
@keyframes csb-caret-sweep {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.csb-sr {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .csb-caret,
  .csb-caret * {
    animation: none !important;
  }
}