body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: #111;
  color: #eee;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  margin: 1.5rem 0 0.5rem;
  font-size: 2rem;
  font-weight: 600;
  color: #ffffff;
}

.instructions {
  font-size: 0.95rem;
  color: #ccc;
  background: #222;
  padding: 1rem;
  margin: 1rem;
  border-radius: 10px;
  width: 90%;
  max-width: 800px;
  line-height: 1.5;
  box-shadow: 0 0 15px rgba(0,0,0,0.3);
}

#viewer-container {
  width: 90%;
  max-width: 1200px;
  height: 600px;
  border: 2px solid #333;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

select {
  margin-top: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: #333;
  color: #fff;
  border: 1px solid #555;
  border-radius: 5px;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1rem 0;
  flex-wrap: wrap; /* optional if you want better responsiveness */
}

.control-row label {
  margin-right: 0.5rem;
  font-weight: 600;
}