html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: black;
}

/* Canvas */
#canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
  pointer-events: none;
}

/* Like button */
#likeBtn {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.4);
  color: white;
  font-size: 22px;
  padding: 8px 18px;
  border-radius: 24px;
  cursor: pointer;
  z-index: 10;
}

#likeBtn.liked {
  color: #ff5a7a;
  border-color: #ff5a7a;
}

/* Floating hearts */
#heart-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 5;
}

.bg-heart {
  position: absolute;
  color: rgba(255, 90, 122, 0.4);
  animation: floatUp 4s ease-out forwards;
}

@keyframes floatUp {
  0% { transform: translateY(0); opacity: 0; }
  10% { opacity: 1; }
  100% { transform: translateY(-120px); opacity: 0; }
}