body {
  background-color: #ffe6f0;
  font-family: 'Segoe UI', sans-serif;
  text-align: center;
  padding-top: 40px;
  overflow-x: hidden;
}

h1 {
  font-size: 3rem;
  color: #ff1493;
  font-weight: bold;
}

#cakeGif {
  display: none;
  margin: 20px auto;
  border-radius: 10px;
  width: 300px;
}

.slider {
  width: 90%;
  max-width: 800px;
  margin: 40px auto;
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
  position: relative;
}

.slides {
  display: flex;
  width: 1000%;
  animation: slide 40s linear infinite;
}

.slides img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

@keyframes slide {
  0%   { transform: translateX(0%); }
  10%  { transform: translateX(-100%); }
  20%  { transform: translateX(-200%); }
  30%  { transform: translateX(-300%); }
  40%  { transform: translateX(-400%); }
  50%  { transform: translateX(-500%); }
  60%  { transform: translateX(-600%); }
  70%  { transform: translateX(-700%); }
  80%  { transform: translateX(-800%); }
  90%  { transform: translateX(-900%); }
  100% { transform: translateX(0%); }
}

#footerMsg {
  font-size: 24px;
  color: green;
  margin-top: 30px;
}

#birthdayMsg {
  display: none;
  font-size: 36px;
  color: #ff007f;
  font-weight: bold;
  margin-top: 30px;
  animation: popUp 1s ease-out;
}

@keyframes popUp {
  0% { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.fireworks, .glitters, .hearts {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

.firework {
  position: absolute;
  width: 10px;
  height: 10px;
  background: red;
  border-radius: 50%;
  animation: explode 1s ease-out forwards;
}

@keyframes explode {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(10); opacity: 0; }
}

.glitter {
  position: absolute;
  width: 4px;
  height: 4px;
  background: gold;
  border-radius: 50%;
  animation: sparkle 3s linear infinite;
}

@keyframes sparkle {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(100vh); opacity: 0; }
}

.heart {
  position: absolute;
  width: 20px;
  height: 20px;
  background: pink;
  transform: rotate(45deg);
  animation: float 5s linear infinite;
}

.heart::before,
.heart::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  background: pink;
  border-radius: 50%;
}

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

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

@keyframes float {
  0% { transform: translateY(0) rotate(45deg); opacity: 1; }
  100% { transform: translateY(-100vh) rotate(45deg); opacity: 0; }
}