body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #ffe4ec, #fceabb);
  margin: 0;
  padding: 0;
  text-align: center;
  overflow-x: hidden;
}

.container {
  padding: 50px 20px;
}

h1 {
  font-size: 2.5rem;
  color: #d63384;
  margin-bottom: 20px;
}

button {
  background-color: #ff5e95;
  color: white;
  border: none;
  padding: 15px 30px;
  font-size: 1rem;
  border-radius: 10px;
  cursor: pointer;
  margin: 10px 5px;
  transition: background-color 0.3s ease;
  box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
}

button:hover {
  background-color: #e34c83;
}

#letter {
  margin-top: 30px;
  font-size: 1.2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
  color: #333;
  padding: 0 10px;
}

.hidden {
  display: none;
}

.signature {
  margin-top: 30px;
  font-style: italic;
  font-weight: bold;
  color: #b3005f;
}

/* Confetti Animation */
@keyframes confetti {
  0% { transform: translateY(0); }
  100% { transform: translateY(100vh); }
}

/* Floating Heart Animation */
@keyframes floatHeart {
  0% {
    bottom: -20px;
    opacity: 0;
    transform: translateX(0);
  }
  100% {
    bottom: 100%;
    opacity: 1;
    transform: translateX(100px);
  }
}

.heart {
  position: fixed;
  font-size: 20px;
  color: red;
  animation: floatHeart 5s linear infinite;
  z-index: 10;
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
  h1 {
    font-size: 2rem;
  }

  button {
    font-size: 0.95rem;
    padding: 12px 20px;
  }

  #letter {
    font-size: 1rem;
  }
}