body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  overflow-x: hidden;
  background-color: #DBBCDF;
}

/* Welcome card */
.welcome-card {
  background: white;
  padding: 3em;
  border-radius: 20px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.2);
  text-align: center;
  max-width: 90%;
  animation: zoomIn 1.5s ease-out forwards;
  margin: auto;
  margin-top: 10%;
}

.welcome-card h1 {
  font-size: 2.8em;
  color: #d63384;
  margin-bottom: 0.5em;
}

.welcome-card p {
  font-size: 1.2em;
  color: #444;
  margin-bottom: 2em;
}

.welcome-card button {
  padding: 0.8em 2em;
  font-size: 1.1em;
  background: #ff4d88;
  color: white;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  box-shadow: 0 0 15px #ff4d88;
  transition: all 0.3s ease;
}

.welcome-card button:hover {
  background: #ff1a66;
  box-shadow: 0 0 25px #ff1a66, 0 0 10px #ff1a66;
  transform: scale(1.05);
}

@keyframes zoomIn {
  0% { transform: rotateY(90deg) scale(0.5); opacity: 0; }
  100% { transform: rotateY(0deg) scale(1); opacity: 1; }
}

/* Envelope */
.envelope {
  width: 220px;
  height: 160px;
  position: relative;
  background: #fef2f2;
  cursor: pointer;
  border: 3px solid #fca5a5;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
  border-radius: 10px;
}

.envelope:hover {
  transform: scale(1.05);
}

.flap {
  position: absolute;
  width: 100%;
  height: 50%;
  background: #fca5a5;
  top: 0;
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  transition: transform 0.6s ease;
  transform-origin: top;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
}

.envelope.open .flap {
  transform: rotateX(180deg);
}

.invitation-img {
  display: none;
  margin-top: 20px;
  border-radius: 12px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
  max-width: 90%;
}

.envelope.open + .invitation-img {
  display: block;
  animation: fadeIn 1s ease-in-out forwards;
}

@keyframes fadeIn {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* Floating hearts */
.heart {
  width: 20px;
  height: 20px;
  background-color: #ff85a2;
  position: absolute;
  top: 100%;
  animation: floatUp 10s linear infinite;
  transform: rotate(45deg);
  border-radius: 50% 50% 0 0;
}

.heart::before,
.heart::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: #ff85a2;
  border-radius: 50%;
}

.heart::before { top: -10px; left: 0; }
.heart::after { top: 0; left: -10px; }

@keyframes floatUp {
  0% { transform: translateY(0) scale(1); opacity: 1; }
  100% { transform: translateY(-120vh) scale(1.5); opacity: 0; }
}

/* Buttons */
.next-btn {
  padding: 0.10em 2em;
  font-size: 1.1em;
  background: #ff4d88;
  color: rgb(217, 214, 214);
  border: none;
  border-radius: 20px;
  cursor: pointer;
  box-shadow: 0 0 15px #ff4d88;
  transition: all 0.3s ease;
}

.next-btn:hover {
  background: #ff1a66;
  box-shadow: 0 0 25px #ff1a66, 0 0 10px #ff1a66;
  transform: scale(1.05);
}