* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-container, .register-container {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  padding: 40px;
  border-radius: 15px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.login-box h2, .register-box h2 {
  font-size: 2rem;
  color: #fff;
  margin-bottom: 30px;
}

.input-group {
  position: relative;
  margin-bottom: 30px;
}

.input-group input {
  width: 100%;
  padding: 10px 15px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 5px;
  font-size: 1rem;
  color: #fff;
  outline: none;
  transition: 0.3s;
}

.input-group label {
  position: absolute;
  top: 50%;
  left: 15px;
  color: #ddd;
  font-size: 1rem;
  transform: translateY(-50%);
  transition: 0.3s;
}

.input-group input:focus ~ label,
.input-group input:valid ~ label {
  top: 0;
  transform: translateY(-100%);
  font-size: 0.8rem;
  color: #fff;
}

button {
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: linear-gradient(135deg, #764ba2, #667eea);
}

.error-message {
  color: red;
  margin-top: 10px;
}