body {
  font-family: 'Poppins', sans-serif;
  background: radial-gradient(circle at center, #0d0d0d, #000000);
  /* LoginPage tarzı */
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #fff;
  text-align: center;
  overflow: hidden;
}

.error-box {
  background: rgba(255, 255, 255, 0.05);
  padding: 40px;
  border-radius: 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  max-width: 500px;
  width: 90%;
}

h1 {
  font-size: 72px;
  margin: 0;
  color: #00ff99;
  /* LoginPage neon yeşili */
  text-shadow: 0 0 20px rgba(0, 255, 153, 0.8);
}

h2 {
  margin: 10px 0;
  font-weight: 600;
}

p {
  margin: 20px 0;
  font-size: 15px;
  color: #ddd;
}

a.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 24px;
  background: #00ff99;
  color: #000;
  border-radius: 8px;
  font-weight: bold;
  text-decoration: none;
  transition: 0.3s;
}

a.btn:hover {
  background: #00ffaa;
  box-shadow: 0 0 15px rgba(0, 255, 170, 0.8);
}

@media (max-width: 600px) {
  .error-box {
    padding: 20px;
  }

  h1 {
    font-size: 48px;
  }

  p {
    font-size: 14px;
  }
}