/* brain.css — estilo da experiência imersiva */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&family=Playfair+Display:ital@1&display=swap');

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

html { scroll-behavior: smooth; }
body {
  background: #050505;
  color: #fff;
  font-family: 'Inter', system-ui, sans-serif;
  overflow-x: hidden;
}

/* Canvas WebGL fixo no fundo, cobrindo a tela toda. */
#webgl {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  z-index: 0;
}

/* Container alto: é ele que gera o scroll (progresso 0→1). */
#experience {
  position: relative;
  z-index: 1;
}

/* Cada etapa ocupa 120vh → 5 etapas = 600vh de scroll. */
.stage {
  height: 120vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 24px;
  pointer-events: none; /* deixa o scroll/3D passar; só CTA e voltar clicáveis */
}
.stage-inner { max-width: 680px; }

.stage .eyebrow {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: #a855f7;
  margin-bottom: 18px;
}
.stage h1 {
  font-size: clamp(2.4rem, 9vw, 5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.stage h2 {
  font-size: clamp(1.7rem, 6vw, 3.2rem);
  font-weight: 600;
  line-height: 1.15;
}
.stage em {
  font-style: normal;
  background: linear-gradient(90deg, #a855f7, #ff00ff, #00d4ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stage p {
  margin-top: 16px;
  color: #b9b9c9;
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.6;
}

.cta {
  pointer-events: auto;
  display: inline-block;
  margin-top: 32px;
  padding: 16px 32px;
  border-radius: 999px;
  background: linear-gradient(90deg, #a855f7, #ff00ff);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 0 44px rgba(168, 85, 247, 0.55);
  transition: transform 0.2s, box-shadow 0.2s;
}
.cta:hover { transform: translateY(-2px); box-shadow: 0 0 60px rgba(255, 0, 255, 0.6); }
.back {
  pointer-events: auto;
  display: block;
  margin-top: 22px;
  color: #8a8a9a;
  text-decoration: none;
  font-size: 0.85rem;
}
.back:hover { color: #00d4ff; }

.scroll-hint {
  margin-top: 44px;
  font-size: 1.5rem;
  color: #a855f7;
  animation: bounce 1.8s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50%      { transform: translateY(10px); opacity: 1; }
}

/* Loader inicial */
#loader {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #050505;
  color: #a855f7;
  letter-spacing: 0.12em;
  font-size: 0.9rem;
  transition: opacity 0.6s ease;
}
#loader.hidden { opacity: 0; pointer-events: none; }

/* Última etapa: texto na parte de baixo da tela (silhueta fica visível acima). */
.stage:last-child { align-items: flex-end; padding-bottom: 7vh; }

/* Atalho fixo "Ir para o site" */
#skip {
  position: fixed;
  top: 20px; right: 22px;
  z-index: 6;
  color: #b9b9c9;
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  padding: 9px 16px;
  border: 1px solid rgba(168, 85, 247, 0.45);
  border-radius: 999px;
  background: rgba(5, 5, 5, 0.4);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
#skip:hover { color: #fff; border-color: #a855f7; background: rgba(168, 85, 247, 0.2); }

/* Botão flutuante de música de fundo */
#bgm-toggle {
  position: fixed;
  left: 20px; bottom: 20px;
  z-index: 6;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(168, 85, 247, 0.5);
  background: rgba(5, 5, 5, 0.5);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: transform 0.2s, border-color 0.2s;
}
#bgm-toggle:hover { transform: scale(1.08); border-color: #a855f7; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .scroll-hint { animation: none; }
}