html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: 'Poppins', sans-serif;
  background: url('/background.png') center center fixed;
  background-size: cover;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.preview-box {
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  padding: 2.5rem 2rem;
  border-radius: 16px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  animation: fadeIn 0.6s ease;
  line-height: 1.6;
  letter-spacing: 0.2px;
  margin: 2rem auto;
}

.preview-box h2 {
  margin-bottom: 1rem;
}

.preview-box p {
  margin-bottom: 1.5rem;
}

.logo {
  width: 80px;
  margin-bottom: 1.5rem;
}

.btn-glass {
  margin-top: 1.5rem;
}

small {
  display: block;
  margin-top: 1.5rem;
  opacity: 0.7;
  font-size: 0.85em;
  word-break: break-all;
}

@keyframes fadeIn {
  from {opacity: 0; transform: translateY(20px);}
  to {opacity: 1; transform: translateY(0);}
}