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

body {
  background: linear-gradient(135deg, #ff7eb3, #ff758c, #ff7eb3);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
  font-family: 'Poppins', sans-serif;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle,
    transparent 20%,
    #ff4d94 20%,
    #ff4d94 80%,
    transparent 80%,
    transparent
  );
  background-size: 50px 50px;
  opacity: 0.1;
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: 800px;
  text-align: center;
  z-index: 10;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.header {
  margin-bottom: 30px;
  animation: fadeIn 1.5s ease;
}

.header h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  color: #fff;
  text-shadow: 0 0 15px rgba(255, 0, 85, 0.7);
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}

.special-name {
  position: relative;
  display: inline-block;
  padding: 0 15px;
  color: #fff;
  font-weight: 700;
  text-shadow: 0 0 20px #ff0077, 0 0 30px #ff0077;
  animation: nameGlow 2s infinite alternate;
}

.envelope-wrapper {
  position: relative;
  width: 100%;
  max-width: 300px;
  height: 200px;
  margin: 0 auto 30px;
  cursor: pointer;
  perspective: 1000px;
  z-index: 20;
  transition: transform 0.3s ease;
}

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

.envelope {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.envelope-front,
.envelope-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 12px;
}

.envelope-front {
  background: linear-gradient(45deg, #ff416c, #ff4b2b);
  box-shadow: 0 15px 35px rgba(255, 0, 85, 0.5);
  z-index: 2;
}

.envelope-flap {
  position: absolute;
  top: 0;
  width: 0;
  height: 0;
  border-left: 150px solid transparent;
  border-right: 150px solid transparent;
  border-top: 100px solid #ff3366;
  transform-origin: top;
  transition: transform 0.5s ease;
  filter: drop-shadow(0 -5px 5px rgba(0, 0, 0, 0.1));
}

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

.envelope-back {
  background: #fff;
  transform: rotateX(180deg);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  flex-direction: column;
  padding: 20px;
  overflow: visible;
  justify-content: flex-start;
}

.letter {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fffdf0;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  padding: 15px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: all 1s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform: translateY(0) scale(1);
  z-index: 10;
  overflow: hidden;
}

.envelope.open .letter {
  transform: translateY(-75%) scale(1.1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

.letter-content {
  padding: 15px;
  text-align: center;
  overflow-y: auto;
  max-height: 100%;
}

.letter h2 {
  color: #ff3366;
  margin-bottom: 20px;
  font-size: clamp(1.8rem, 4.5vw, 2.5rem);
  font-family: 'Dancing Script', cursive;
  text-shadow: 0 0 5px rgba(255, 51, 102, 0.3);
}

.letter p {
  font-size: clamp(1rem, 3.5vw, 1.2rem);
  line-height: 1.6;
  color: #555;
  margin-bottom: 15px;
  font-family: 'Dancing Script', cursive;
}

.letter .signature {
  font-family: 'Dancing Script', cursive;
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  color: #ff3366;
  margin-top: 20px;
  text-align: center;
}

.fullscreen-letter {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #fffaf0, #fff0f5);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transform: scale(0.9);
  opacity: 0;
  transition: all 0.5s ease;
  overflow: hidden;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.3);
  border-radius: 0;
  visibility: hidden;
}

.fullscreen-letter.active {
  transform: scale(1);
  opacity: 1;
  visibility: visible;
}

.close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background: linear-gradient(45deg, #ff416c, #ff4b2b);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 28px;
  cursor: pointer;
  z-index: 101;
  box-shadow: 0 4px 15px rgba(255, 0, 85, 0.4);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.close-btn:hover {
  transform: rotate(90deg) scale(1.1);
  box-shadow: 0 6px 20px rgba(255, 0, 85, 0.6);
}

.fullscreen-letter-content {
  padding: 80px 20px 20px;
  height: 100%;
  overflow-y: auto;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  text-align: center;
}

.fullscreen-letter h2 {
  color: #ff3366;
  margin-bottom: 30px;
  font-size: 3rem;
  font-family: 'Dancing Script', cursive;
  text-shadow: 0 0 10px rgba(255, 51, 102, 0.3);
}

.fullscreen-letter p {
  font-size: 1.8rem;
  line-height: 1.8;
  color: #555;
  margin-bottom: 25px;
  font-family: 'Dancing Script', cursive;
}

.fullscreen-letter .signature {
  font-family: 'Dancing Script', cursive;
  font-size: 3rem;
  color: #ff3366;
  margin-top: 40px;
}

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

.heart-fall {
  position: absolute;
  top: -50px;
  animation: fall linear forwards;
  color: #ff4081;
  font-size: 24px;
}

.heart-explosion {
  position: absolute;
  animation: explode 1.5s ease-out forwards;
  color: #ff0077;
  font-size: 24px;
  z-index: 99;
}

.floating-heart {
  position: absolute;
  animation: float 8s ease-in-out infinite;
  color: #ff4081;
  font-size: 48px;
  opacity: 0.7;
  z-index: 5;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

@keyframes pulse {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.1);
  }

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

@keyframes nameGlow {
  from {
    text-shadow: 0 0 5px rgba(255, 0, 119, 0.5);
  }

  to {
    text-shadow: 0 0 20px #ff0077, 0 0 40px #ff0077;
  }
}

@keyframes fall {
  to {
    transform: translateY(105vh) rotate(360deg);
    opacity: 0;
  }
}

@keyframes explode {
  0% {
    transform: translate(0, 0) scale(0.5);
    opacity: 1;
  }

  100% {
    transform: translate(var(--tx), var(--ty)) scale(1);
    opacity: 0;
  }
}

@keyframes float {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }

  25% {
    transform: translate(20px, -20px) rotate(20deg);
  }

  50% {
    transform: translate(0, -40px) rotate(0deg);
  }

  75% {
    transform: translate(-20px, -20px) rotate(-20deg);
  }

  100% {
    transform: translate(0, 0) rotate(0deg);
  }
}

@keyframes floatText {
  0% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }

  100% {
    transform: translateY(0);
  }
}

.floating {
  animation: floatText 3s ease-in-out infinite;
}

.paper-texture {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ff4081' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
  opacity: 0.3;
  pointer-events: none;
}

.floating-hearts {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.notification {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 0.9rem;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.notification.show {
  opacity: 1;
}

@media (max-width: 768px) {
  .fullscreen-letter h2 {
    font-size: 2.5rem;
  }

  .fullscreen-letter p {
    font-size: 1.5rem;
  }

  .close-btn {
    width: 45px;
    height: 45px;
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .fullscreen-letter {
    top: 0;
    height: 100%;
  }

  .fullscreen-letter-content {
    padding: 70px 15px 15px;
  }

  .fullscreen-letter h2 {
    font-size: 2rem;
  }

  .fullscreen-letter p {
    font-size: 1.3rem;
    margin-bottom: 20px;
  }

  .close-btn {
    top: 15px;
    right: 15px;
    width: 40px;
    height: 40px;
    font-size: 22px;
  }
}