* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #37B6C5;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Pantalla de carga blanca con desvanecimiento */
.intro-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: #ffffff;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  cursor: default;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.9s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.9s ease;
  will-change: opacity, visibility;
}

.intro-screen.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro-content {
  text-align: center;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.intro-title {
  color: #1b353f;
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.3px;
}

.loader-spinner {
  width: 44px;
  height: 44px;
  border: 4px solid rgba(55, 182, 197, 0.2);
  border-top-color: #37B6C5;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

#glCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
}