<div class="gm-input-bg">
  <label class="gm-input">
    <span class="gm-input__lbl">Email</span>
    <input class="gm-input__field" type="email" placeholder="[email protected]" />
  </label>
</div>

.gm-input-bg {
  position: relative; padding: 32px;
  border-radius: 18px; overflow: hidden;
  background:
    radial-gradient(ellipse at 30% 30%, #a855f7 0%, transparent 55%),
    radial-gradient(ellipse at 70% 70%, #6366f1 0%, transparent 55%),
    #1a0a2e;
}
.gm-input { display: block; }
.gm-input__lbl {
  display: block;
  font: 600 11px system-ui, sans-serif;
  color: rgba(255, 255, 255, 0.65);
  letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 8px;
}
.gm-input__field {
  width: 100%; box-sizing: border-box;
  background: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  padding: 11px 14px;
  color: #fff;
  font: 13px system-ui, sans-serif;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.gm-input__field::placeholder { color: rgba(255, 255, 255, 0.55); }
.gm-input__field:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.55);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18),
    0 0 24px rgba(168, 85, 247, 0.25);
}