body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #0f0f0f, #1a1a1a);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #fff;
}

h1 {
  font-size: 27px;
  color: #ff3b3b;
  margin-bottom: 40px;
  text-shadow: 0 0 8px rgba(255, 59, 59, 0.6);
  letter-spacing: 2px;
  animation: fadeInDown 1s ease-in-out;
}

.form-group {
  position: relative;
  width: 300px;
  margin: 0 auto;
}

.form-group input {
  border: 2px solid #fff;
  border-radius: 8px;
  width: 100%;
  max-width: 275px;
  font-size: 1rem;
  padding: 1rem 0.75rem;
  outline: none;
  color: #fff;
  background: transparent;
  transition: 0.3s;
}

.form-group label {
  position: absolute;
  top: 50%;
  left: 0.75rem;
  padding: 0 6px;
  color: #bbb;
  font-size: 1em;
  font-weight: 400;
  pointer-events: none;
  transform: translateY(-50%);
  transition: all 0.3s ease-in-out;
  background: linear-gradient(135deg, #0f0f0f, #1a1a1a);
}

.form-group input:is(:focus, :valid) {
  border: 2px solid #ff3b3b;
  box-shadow: 0 5px 10px #B00;
}

.form-group input:is(:focus, :valid)+label {
  top: 0;
  font-size: 0.9em;
  color: #ff3b3b;
}