* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  height: 100vh;
  display: flex; 
  justify-content: center; 
  align-items: center;
  background: linear-gradient(270deg, #fbeaff, #e7e0f9, #ffdee9, #b5fffc);
  background-size: 800% 800%;
  animation: bgMove 15s ease infinite;
}
@keyframes bgMove {
  0% { background-position: 0% 50% }
  50% { background-position: 100% 50% }
  100% { background-position: 0% 50% }
}
.app {
  backdrop-filter: blur(10px);
  background-color: rgba(255,255,255,0.85);
  padding: 2rem;
  border-radius: 24px;
  max-width: 450px;
  width: 90%;
  text-align: center;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  animation: fadeIn 0.8s ease;
}
@keyframes fadeIn { 
  from {opacity:0; transform:translateY(10px);} 
  to {opacity:1; transform:translateY(0);} 
}
.titulo {
  font-size: 2rem;
  font-weight: bold;
  color: #9b5de5;
  margin-bottom: 1rem;
}
.mensagem {
  font-size: 1.1rem;
  color: #444;
  background-color: rgba(255,255,255,0.7);
  padding: 1.2rem;
  border-radius: 16px;
  margin-bottom: 2rem;
  min-height: 80px;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
  opacity: 0;
  transition: opacity 0.6s ease;
}
.mensagem.show { opacity: 1; }
button {
  background-color: #ffb4a2;
  border: none;
  color: white;
  padding: 0.7rem 1.4rem;
  margin: 0.4rem;
  border-radius: 16px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s, background 0.3s;
}
button:hover { background-color: #e5989b; transform: translateY(-2px); }
.feltroverso {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: #8e7cc3;
}