* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background: linear-gradient(135deg, #111827, #1f2937);
  min-height: 100vh;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  color: white;
  padding: 20px;
}

.login-container {
  width: 100%;
  max-width: 380px;

  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);

  border-radius: 18px;
  padding: 35px 25px;

  box-shadow: 0 10px 35px rgba(0,0,0,0.35);

  text-align: center;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 14px;
  color: #d1d5db;
  margin-bottom: 30px;
}

.input-group {
  margin-bottom: 18px;
  text-align: left;
}

.input-group label {
  display: block;
  margin-bottom: 7px;
  font-size: 14px;
  color: #e5e7eb;
}

.input-group input {
  width: 100%;
  padding: 14px;

  border: none;
  border-radius: 10px;

  background: rgba(255,255,255,0.12);
  color: white;

  font-size: 15px;
  outline: none;

  transition: 0.3s;
}

.input-group input:focus {
  background: rgba(255,255,255,0.18);
  border: 1px solid #3b82f6;
}

.login-btn {
  width: 100%;
  padding: 14px;

  border: none;
  border-radius: 10px;

  background: #2563eb;
  color: white;

  font-size: 16px;
  font-weight: bold;

  cursor: pointer;
  transition: 0.3s;

  margin-top: 10px;
}

.login-btn:hover {
  background: #1d4ed8;
}

.error-message {
  margin-top: 15px;
  color: #f87171;
  font-size: 14px;
  display: none;
}

footer {
  margin-top: 35px;
  text-align: center;
  font-size: 13px;
  color: #d1d5db;
  line-height: 1.7;
}

footer a {
  color: #93c5fd;
  text-decoration: none;
}

@media (max-width: 480px) {
  .login-container {
    padding: 28px 20px;
  }

  .logo {
    font-size: 24px;
  }
}