/* A1 — Floating Label. HTML and CSS only, no JavaScript. */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: #f4f6fa;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 26px;
  width: 340px;
}

.field {
  position: relative;
}

.field input {
  width: 100%;
  height: 58px;
  padding: 22px 14px 6px;
  font-size: 16px;
  color: #1c2331;
  background: #fff;
  border: 1px solid #c3cad6;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus {
  border-color: #3f6fe0;
  box-shadow: 0 0 0 3px rgba(63, 111, 224, 0.16);
}

.field label {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  color: #7c869a;
  pointer-events: none;
  transition: top 0.18s ease, transform 0.18s ease, font-size 0.18s ease, color 0.18s ease;
}

/* Float the label while the input is focused, and keep it floating as long as the
   input has a value (the placeholder is only shown while the field is empty). */
.field input:focus + label,
.field input:not(:placeholder-shown) + label {
  top: 9px;
  transform: none;
  font-size: 12px;
  color: #3f6fe0;
}

.field input:not(:focus):not(:placeholder-shown) + label {
  color: #7c869a;
}