:root{
  --primary: #fff;
  --bg-envelope-color: #f5edd1;
  --envelope-tab: #ecdeb8;
  --envelope-cover: #e6cfa7;
  --shadow-color: rgba(0, 0, 0, 0.2);
  --txt-color: #444;
  --heart-color: rgb(252, 8, 231);
}

/* 🌑 POPUP OVERLAY */
#envelopePopup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;

  display: none;
  justify-content: center;
  align-items: center;

  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(6px);

  z-index: 9999;
}

/* 📦 WRAPPER */
.envelope-wrapper {
  background: var(--bg-envelope-color);
  box-shadow: 0 0 40px var(--shadow-color);
  animation: popUp 0.35s ease forwards;
  position: relative;
}

/* 🎬 POP ANIMATION */
@keyframes popUp {
  from {
    transform: scale(0.7);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* 📩 ENVELOPE */
.envelope {
  position: relative;
  width: 300px;
  height: 230px;
}

/* 🔺 TOP FLAP */
.envelope::before {
  content: "";
  position: absolute;
  top: 0;
  z-index: 2;

  border-top: 130px solid var(--envelope-tab);
  border-right: 150px solid transparent;
  border-left: 150px solid transparent;

  transform-origin: top;
  transition: all 0.5s ease-in-out 0.7s;
}

/* 📦 BODY */
.envelope::after {
  content: "";
  position: absolute;
  z-index: 2;

  border-top: 130px solid transparent;
  border-right: 150px solid var(--envelope-cover);
  border-bottom: 100px solid var(--envelope-cover);
  border-left: 150px solid var(--envelope-cover);
}

/* 📄 LETTER (🔥 FIXED PERFECTLY) */
.envelope .letter {
  position: absolute;

  left: 50%;
  bottom: 0;
  transform: translateX(-50%);   /* ✅ KEEP CENTER */

  width: 60%;
  height: 80%;
  background: var(--primary);

  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;

  padding: 14px 12px;
  border-radius: 10px;

  text-align: left;
  box-shadow: 0 10px 25px var(--shadow-color);

  transition: all 1s ease-in-out;
}

/* 💌 TEXT */
.text {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--txt-color);
  font-size: 12px;
  line-height: 1.4;
}

/* ❤️ HEART BUTTON */
.heart {
  position: absolute;
  top: 50%;
  left: 50%;

  width: 15px;
  height: 15px;

  background: var(--heart-color);
  z-index: 4;

  transform: translate(-50%, -20%) rotate(-45deg);
  transition: transform 0.5s ease-in-out;
  box-shadow: 0 1px 6px var(--shadow-color);
  cursor: pointer;
}

.heart::before,
.heart::after {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  background: var(--heart-color);
  border-radius: 50%;
}

.heart::before {
  top: -7.5px;
}

.heart::after {
  right: -7.5px;
}

/* ✨ OPEN ANIMATION */
.flap .envelope::before {
  transform: rotateX(180deg);
  z-index: 0;
}

/* 🔥 FIXED OPEN LETTER ANIMATION */
.flap .envelope .letter {
  bottom: 130px;
  transform: translateX(-50%) scale(1.25);  /* ✅ stays centered */
  transition-delay: 1s;
}

.flap .heart {
  transform: rotate(45deg);
  transition-delay: 0.4s;
}