body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: sans-serif;
  background-color: #e0f7fa;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  font-size: 2rem;
  color: #004d40;
}

.login-container {
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  width: 100%;
  max-width: 350px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.login-container h2 {
  text-align: center;
  color: #006064;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 5px;
  color: #333;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 8px;
  border: 1px solid #bbb;
  border-radius: 5px;
  font-size: 14px;
}

button {
  width: 100%;
  padding: 10px;
  background-color: #00796b;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 15px;
  cursor: pointer;
}

button:hover {
  background-color: #004d40;
}

.error-message {
  color: #d32f2f;
  font-size: 13px;
  text-align: center;
  margin-bottom: 10px;
}