body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.login-container {
  background: #fff;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  width: 360px;
  text-align: center;
}

h2 {
  margin-bottom: 1.5rem;
  color: #333;
}

label {
  display: block;
  margin: 0.5rem 0 0.25rem;
  font-size: 0.9rem;
  color: #555;
  text-align: left;
  max-width: 260px;
  margin-left: auto;
  margin-right: auto;
}

input, button {
  display: block;
  width: 100%;
  max-width: 260px;
  margin: 0 auto 1rem;
  padding: 0.75rem;
  border-radius: 0.5rem;
  font-size: 1rem;
}

input {
  border: 1px solid #ccc;
  transition: border-color 0.3s;
}

input:focus {
  border-color: #667eea;
  outline: none;
}

button {
  border: none;
  background: #667eea;
  color: white;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #5a67d8;
}

.footer {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: #777;
}

/* 🔴 Hata mesajı */
#loginError {
  color: #ff5252;
  font-size: 0.9rem;
  margin-bottom: 10px;
  display: none;
}