:root {
  color-scheme: light dark;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  margin: 0;
  background: linear-gradient(135deg, #090b1a 0%, #1f2240 100%);
  color: #f6f6ff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}

.app-header h1 {
  margin: 0 0 0.75rem;
  font-size: 2rem;
}

.app-header a {
  color: #9adeff;
}

.app-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1.5rem;
}

button#start-ar {
  background: #4e7cff;
  color: #ffffff;
  border: none;
  border-radius: 999px;
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button#start-ar:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(78, 124, 255, 0.35);
}

.hint {
  font-size: 0.9rem;
  opacity: 0.8;
  max-width: 320px;
  text-align: center;
}

a-scene {
  flex: 1;
  width: 100%;
  min-height: 60vh;
  display: none;
}

a-scene.active {
  display: block;
}

@media (max-width: 768px) {
  .app-header h1 {
    font-size: 1.5rem;
  }

  button#start-ar {
    width: 80%;
    max-width: 280px;
  }
}