style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Georgia', serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea, #764ba2, #f093fb);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
}

/* Floating hearts background */
.hearts-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.bg-heart {
  position: absolute;
  font-size: 20px;
  opacity: 0.3;
  animation: floatUp 8s infinite ease-in;
}

@keyframes floatUp {
  0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
  10% { opacity: 0.3; }
  90% { opacity: 0.3; }
  100% { transform: translateY(-100px) rotate(360deg); opacity: 0; }
}

/* Envelope animation */
.envelope-wrapper {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  cursor: pointer;
  transition: transform 0.3s ease;
}

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

.envelope {
  position: relative;
  width: 280px;
  height: 180px;
  animation: float 2s infinite ease-in-out;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.body {
  position: absolute;
  bottom: 0;
  width: 280px;
  height: 180px;
  background: #fff;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-left: 140px solid transparent;
  border-right: 140px solid transparent;
  border-top: 100px solid #f8b4d9;
  transform-origin: top center;
  transition: transform 0.6s ease;
  z-index: 2;
}

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

/* Hint */
.click-hint {
  color: #fff;
  font-size: 18px;
  font-weight: bold;
  text-shadow: 0 0 10px rgba(0,0,0,0.3);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

/* Letter Styles */
.letter-container {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 100;
  background: rgba(0,0,0,0.5);
  animation: fadeIn 0.5s ease forwards;
}

.letter-container.active { display: flex; }

.letter {
  background: #fffef7;
  max-width: 700px;
  padding: 50px;
  border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  position: relative;
  animation: slideIn 1s ease;
}

@keyframes slideIn {
  from { transform: translateY(100vh) scale(0.9); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.animated-title {
  color: #764ba2;
  text-align: center;
  font-size: 36px;
  margin-bottom: 10px;
  animation: glow 2s infinite alternate;
}

@keyframes glow {
  from { text-shadow: 0 0 10px rgba(118,75,162,0.4); }
  to { text-shadow: 0 0 25px rgba(118,75,162,0.8); }
}

.letter-content {
  color: #333;
  line-height: 1.8;
  margin-top: 30px;
}

.paragraph {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s forwards;
}

.paragraph:nth-child(1) { animation-delay: 0.5s; }
.paragraph:nth-child(2) { animation-delay: 0.8s; }
.paragraph:nth-child(3) { animation-delay: 1.1s; }
.paragraph:nth-child(4) { animation-delay: 1.4s; }
.paragraph:nth-child(5) { animation-delay: 1.7s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.signature {
  text-align: right;
  margin-top: 40px;
  color: #764ba2;
  font-style: italic;
  font-size: 20px;
}

.close-btn {
  position: absolute;
  top: 20px; right: 20px;
  background: #f8b4d9;
  border: none;
  color: #fff;
  padding: 10px 25px;
  border-radius: 25px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
}

.close-btn:hover {
  background: #764ba2;
  transform: scale(1.1);
}