body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #1f4037, #99f2c8);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.login-container {
  background: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  text-align: center;
}
.logo {
  width: 80px;
  margin-bottom: 20px;
}
input {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
}
button {
  background-color: #2ecc71;
  color: white;
  padding: 12px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
}
button:hover {
  background-color: #27ae60;
}
.error-message {
  color: red;
  margin-top: 10px;
}