@view-transition {
  navigation: auto;
}

/* --- Animations --- */
@keyframes flip-out {
  0% {
    opacity: 1;
    transform: rotateY(0deg) scale(1);
  }
  100% {
    opacity: 0;
    transform: rotateY(180deg) scale(0.8);
  }
}

@keyframes flip-in {
  0% {
    opacity: 0;
    transform: rotateY(-180deg) scale(0.8);
  }
  100% {
    opacity: 1;
    transform: rotateY(0deg) scale(1);
  }
}

/* --- Apply to transition pseudo-elements --- */
::view-transition-old(flip) {
  animation: 300ms ease-out forwards flip-out;
  transform-origin: center;
}

::view-transition-new(flip) {
  animation: 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards flip-in;
  transform-origin: center;
}

/* --- Base Layout --- */
body {
  font-family: sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0 auto;
  color: #fff;
  max-width: 640px;
  width: 100%;
}

header {
  padding: 2em 1em 1em;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 2em 1em;
}

footer {
  padding: 1em;
  font-size: 0.9em;
  opacity: 0.7;
}

footer a {
  background: none;
  padding: 0;
  font-size: inherit;
  text-decoration: underline;
}

a {
  text-decoration: underline;
  color: inherit;
}

.btn {
  display: inline-block;
  padding: 1em 2em;
  border-radius: 8px;
  color: white;
  text-decoration: none;
  font-size: 1.2em;
  view-transition-name: flip;
}

p {
  max-width: 600px;
  margin-bottom: 2em;
}

.code-block {
  background: rgba(0, 0, 0, 0.2);
  padding: 1em;
  border-radius: 8px;
  font-family: monospace;
  font-size: 0.9em;
  text-align: left;
  max-width: 600px;
  margin: 1em 0;
  overflow-x: auto;
}

/* Page-specific backgrounds */
body.page-1 {
  background: #111;
}

body.page-1 .btn {
  background: #0a84ff;
}

body.page-2 {
  background: #0a84ff;
}

body.page-2 .btn {
  background: #444;
}

body.page-3 {
  background: #34c759;
}

body.page-3 .btn {
  background: #fff;
  color: #34c759;
}