* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

/* Desktop page — dark blue theme */
body.desktop {
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
}

/* Mobile page — dark purple theme, visually distinct */
body.mobile {
  background: linear-gradient(135deg, #1a0533, #3b0764, #6b21a8);
}

.container {
  text-align: center;
  padding: 2rem;
  max-width: 640px;
}

.container h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.container p {
  font-size: 1.125rem;
  line-height: 1.8;
  opacity: 0.85;
}

@media (max-width: 480px) {
  .container h1 {
    font-size: 1.75rem;
  }
  .container p {
    font-size: 1rem;
  }
}