body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  color: white;
  text-align: center;
  overflow-x: hidden;
  background: black;
}

/* fundo canvas */
#bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

/* tela inicial */
.start {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: pulse 2s infinite;
}

.item img {
  width: 100%;
  border-radius: 12px;
  margin-top: 10px;
}

.timeline {
  opacity: 0;
  transition: 0.8s;
}

.timeline:not(.hidden) {
  opacity: 1;
}

/* app */
.app {
  padding: 20px;
}

.hidden {
  display: none;
}

/* título cursivo */
.titulo {
  font-family: 'Great Vibes', cursive;
  font-size: 36px;
}

/* texto */
#texto {
  margin-top: 20px;
  min-height: 80px;
}

/* botão */
button {
  margin-top: 20px;
  padding: 12px;
  border-radius: 20px;
  border: none;
  background: pink;
}

/* timeline */
.timeline {
  margin-top: 20px;
}

.item {
  margin: 10px;
  padding: 10px;
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
  opacity: 0;
  transform: translateY(20px);
  transition: 0.5s;
}

.item.show {
  opacity: 1;
  transform: translateY(0);
}

/* animação */
@keyframes pulse {
  50% { transform: scale(1.05); }
}

/* mobile */
body {
  max-width: 500px;
  margin: auto;
}