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

html,
body {
  overflow-x: hidden;
  width: 100%;
  position: relative;
  font-family: "Playwrite GB J Guides", cursive;
  font-weight: 400;
  font-style: italic;
}

: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);
}

.one {
  background-color: #cccccc;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background: var(--bg-color);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.background {
  height: 100vh;
  width: 100%;
  position: relative;
}

.one {
  width: 100%;
  height: 100%;
}

.container {
  height: 100%;
  width: 100%;
  display: grid;
  position: absolute;
  place-items: center;
}

.container>.envelope-wrapper {
  background: var(--bg-envelope-color);
  box-shadow: 0 0 40px var(--shadow-color);
  animation: floating 3s ease-in-out infinite;
  position: relative;
  z-index: 5;
}

@keyframes floating {
  0% {
    transform: translateY(0px) rotate(0deg);
  }

  50% {
    transform: translateY(-20px) rotate(1deg);
  }

  100% {
    transform: translateY(0px) rotate(0deg);
  }
}

.envelope-wrapper>.envelope {
  position: relative;
  width: 500px;
  height: 240px;
}

.envelope-wrapper>.envelope::before {
  content: "";
  position: absolute;
  top: 0;
  z-index: 2;
  border-top: 150px solid var(--envelope-tab);
  border-right: 250px solid transparent;
  border-left: 250px solid transparent;
  transform-origin: top;
  transition: all 0.5s ease-in-out 0.7s;
}

.envelope-wrapper>.envelope::after {
  content: "";
  position: absolute;
  z-index: 2;
  width: 0px;
  height: 0px;
  border-top: 150px solid transparent;
  border-right: 250px solid var(--envelope-cover);
  border-bottom: 100px solid var(--envelope-cover);
  border-left: 250px solid var(--envelope-cover);
}

.envelope>.letter {
  position: absolute;
  right: 20%;
  bottom: 0;
  width: 60%;
  height: 98%;
  background: var(--primary);
  text-align: center;
  transition: all 1s ease-in-out;
  box-shadow: 0 0 5px var(--shadow-color);
  padding: 15px 15px 50px 15px;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Custom Scrollbar cho tờ giấy */
.envelope>.letter::-webkit-scrollbar {
  width: 3px;
}

.envelope>.letter::-webkit-scrollbar-track {
  background: transparent;
}

.envelope>.letter::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}

.envelope>.letter>.text {
  font-family: 'Comic Neue';
  color: var(--txt-color);
  text-align: left;
  font-size: 12px;
}

.heart {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50px;
  height: 50px;
  z-index: 4;
  transform: translate(-50%, -20%);
  transition: transform 0.5s ease-in-out 1s, opacity 0.5s ease-in-out 1s;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.heart img {
  border-radius: 50%;
  border: 5px solid white;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.3));
}

.flap>.envelope:before {
  transform: rotateX(180deg);
  z-index: 0;
}

.envelope>.flower {
  position: absolute;
  width: 150px;
  bottom: 5%;
  left: 50%;
  transform: translateX(-50%);
  z-index: -1;
  transition: all 1s ease-in-out 1s;
  opacity: 0;
  pointer-events: none;
}

.envelope>.flower img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.2));
}

.flap>.envelope>.flower1 {
  transform: translateX(-195%) translateY(-90%) rotate(-30deg) scale(1.5);
  opacity: 1;
}

.flap>.envelope>.flower2 {
  transform: translateX(95%) translateY(-90%) rotate(30deg) scale(1.5);
  opacity: 1;
}

.flap>.envelope>.letter {
  bottom: 140px;
  transform: scale(1.5);
  transition-delay: 1s;
}

.flap>.heart {
  transform: translate(-50%, 80%) rotate(10deg);
  opacity: 1;
  transition-delay: 0.4s;
}

.love {
  text-align: center;
  font-weight: bold;
}

.photo-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.random-photo {
  position: absolute;
  width: 150px;
  height: 150px;
  object-fit: cover;
  border: 8px solid white;
  border-radius: 20px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transform: translate(-50%, -50%) scale(0) rotate(-10deg);
  transition: all 1.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: -1;
}

.random-photo.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1) rotate(var(--rotation));
}


.gift-button {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
  margin-top: 20px;
  margin-bottom: 45px;
  padding: 5px 10px;
  background: linear-gradient(135deg, #ff6b6b, #ff8787);
  border: 3px solid white;
  border-radius: 15%;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  opacity: 0;
  transform: scale(0);
  pointer-events: none;
  z-index: 9999999;
  /* Đảm bảo nằm trên cùng */
}

.gift-button.show {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
  animation: giftBounce 2s infinite;
  /* Hiệu ứng nhấp nhô */
}

@keyframes giftBounce {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.15);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.6);
  }
}

.gift-button:hover {
  background: linear-gradient(135deg, #ff8787, #ff6b6b);
  transform: scale(1.1) !important;
}

.gift-button:active {
  transform: scale(0.9) !important;
  /* Hiệu ứng khi nhấn vào */
  transition: 0.1s;
}

.text {
  position: relative;
}

.text::after {
  content: '|';
  display: inline-block;
  animation: blink 0.7s infinite;
  margin-left: 2px;
  font-weight: bold;
}

.typing-done .text::after {
  display: none;
}

@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

/* Emoji animation styles */
.emoji-float {
  position: fixed;
  font-size: 2rem;
  pointer-events: none;
  z-index: 1;
  animation: floatUp 4s ease-out forwards;
}

@keyframes floatUp {
  0% {
    transform: translateY(0) translateX(0) rotate(0deg) scale(0);
    opacity: 1;
  }

  10% {
    transform: translateY(-20px) translateX(var(--randomX)) rotate(20deg) scale(1);
    opacity: 1;
  }

  90% {
    transform: translateY(-120vh) translateX(var(--randomX)) rotate(360deg) scale(0.8);
    opacity: 0.8;
  }

  100% {
    transform: translateY(-120vh) translateX(var(--randomX)) rotate(360deg) scale(0);
    opacity: 0;
  }
}

/* RESPONSIVE STYLES */
@media (max-width: 600px) {
  .envelope-wrapper>.envelope {
    width: 300px;
    height: 160px;
  }

  .envelope-wrapper>.envelope::before {
    border-top: 100px solid var(--envelope-tab);
    border-right: 151px solid transparent;
    border-left: 151px solid transparent;
  }

  .envelope-wrapper>.envelope::after {
    border-top: 100px solid transparent;
    border-right: 151px solid var(--envelope-cover);
    border-bottom: 60px solid var(--envelope-cover);
    border-left: 151px solid var(--envelope-cover);
  }

  .envelope>.letter {
    width: 70%;
    padding: 10px 10px 30px 10px;
  }

  .flap>.envelope>.letter {
    bottom: 110px;
    transform: scale(1.2);
    left: 15%;
  }

  .envelope>.flower {
    width: 80px;
  }

  .flap>.envelope>.flower1 {
    transform: translateX(-200%) translateY(-100%) rotate(-30deg) scale(1.1);
  }

  .flap>.envelope>.flower2 {
    transform: translateX(100%) translateY(-100%) rotate(30deg) scale(1.1);
  }

  .random-photo {
    width: 90px;
    height: 90px;
    border-width: 3px;
  }

  .heart {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 400px) {
  .envelope-wrapper>.envelope {
    width: 260px;
    height: 140px;
  }

  .envelope-wrapper>.envelope::before {
    border-top-width: 80px;
    border-right-width: 131px;
    border-left-width: 131px;
  }

  .envelope-wrapper>.envelope::after {
    border-top-width: 80px;
    border-right-width: 131px;
    border-bottom-width: 60px;
    border-left-width: 131px;
  }

  .flap>.envelope>.letter {
    transform: scale(1.1);
    bottom: 80px;
  }
}

#universe-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 100000;
  display: none;
  background-color: #160016;
  opacity: 0;
  transition: opacity 2s ease-in-out;
}

#universe-container.show {
  display: block;
  opacity: 1;
}

#universe-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}