body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: auto;
}

#title {
  text-align: center;
  color: #FF6B35;
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
}

model-viewer {
  height: 60vh;
  width: 100%;
  background-color: #ffffff;
}

/* Controls */
#controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 12px;
  max-width: 700px;
  margin: 0 auto;
  height: 20vh;
}

.note-btn {
  padding: 12px 12px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #FF6B35, #F7931E);
  color: white;
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  position: relative;
  overflow: hidden;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.note-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.note-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.note-btn:hover::before {
  left: 100%;
}

.note-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(255, 107, 53, 0.3);
  background: linear-gradient(135deg, #E55A2B, #E0851A);
}

/* Responsive Design */
@media (max-width: 768px) {
  #title {
    font-size: 2rem;
    margin: 15px 0 8px 0;
  }
  
}

@media (max-width: 480px) {
  #title {
    font-size: 1.8rem;
    margin: 12px 0 6px 0;
  }
  
  model-viewer {
    height: 50vh;
  }
  
  #controls {
    grid-template-columns: repeat(2, 1fr);
    height: 30vh;
  }
}

@media (max-width: 320px) {
  #title {
    font-size: 1.5rem;
    margin: 10px 0 5px 0;
  }
}


.progress-bar {
  display: block;
  width: 33%;
  height: 10%;
  max-height: 2%;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate3d(-50%, -50%, 0);
  border-radius: 25px;
  box-shadow: 0px 3px 10px 3px rgba(0, 0, 0, 0.5), 0px 0px 5px 1px rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.9);
  background-color: rgba(0, 0, 0, 0.5);
}

.progress-bar.hide {
  visibility: hidden;
  transition: visibility 0.3s;
}

.update-bar {
  background-color: rgba(255, 255, 255, 0.9);
  width: 0%;
  height: 100%;
  border-radius: 25px;
  float: left;
  transition: width 0.3s;
}

#ar-button {
  background-image: url(ar_icon.png);
  background-repeat: no-repeat;
  background-size: 20px 20px;
  background-position: 12px 50%;
  background-color: #fff;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  bottom: 16px;
  padding: 0px 16px 0px 40px;
  font-family: Roboto Regular, Helvetica Neue, sans-serif;
  font-size: 14px;
  color:#4285f4;
  height: 36px;
  line-height: 36px;
  border-radius: 18px;
  border: 1px solid #DADCE0;
}

#ar-button:active {
  background-color: #E8EAED;
}

#ar-button:focus {
  outline: none;
}

#ar-button:focus-visible {
  outline: 1px solid #4285f4;
}

@keyframes circle {
  from { transform: translateX(-50%) rotate(0deg) translateX(50px) rotate(0deg); }
  to   { transform: translateX(-50%) rotate(360deg) translateX(50px) rotate(-360deg); }
}

@keyframes elongate {
  from { transform: translateX(100px); }
  to   { transform: translateX(-100px); }
}

model-viewer > #ar-prompt {
  position: absolute;
  left: 50%;
  bottom: 60px;
  animation: elongate 2s infinite ease-in-out alternate;
  display: none;
}

model-viewer[ar-status="session-started"] > #ar-prompt {
  display: block;
}

model-viewer > #ar-prompt > img {
  animation: circle 4s linear infinite;
}