* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Montserrat", system-ui, sans-serif;
  background: #000;
  color: #fff;
}

.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: #000;
  pointer-events: none;
  contain: paint;
}

/* Glow sem filter:blur (blur grande trava o scroll/GPU) */
.sky__glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.sky__glow--a {
  width: 55vw;
  height: 55vw;
  top: -15%;
  left: -10%;
  background: radial-gradient(circle, rgba(91, 44, 255, 0.4) 0%, transparent 68%);
  opacity: 0.9;
}

.sky__glow--b {
  width: 45vw;
  height: 45vw;
  right: -8%;
  bottom: 10%;
  background: radial-gradient(circle, rgba(255, 45, 138, 0.32) 0%, transparent 68%);
  opacity: 0.85;
}

.stars {
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background-repeat: repeat;
  will-change: transform;
}

.stars--far {
  background-image:
    radial-gradient(1px 1px at 8% 12%, #fff, transparent),
    radial-gradient(1px 1px at 22% 38%, #fff, transparent),
    radial-gradient(1px 1px at 41% 18%, #cde7ff, transparent),
    radial-gradient(1px 1px at 57% 62%, #fff, transparent),
    radial-gradient(1px 1px at 73% 28%, #fff, transparent),
    radial-gradient(1px 1px at 88% 74%, #fff, transparent),
    radial-gradient(1px 1px at 14% 81%, #fff, transparent),
    radial-gradient(1px 1px at 33% 55%, #fff, transparent),
    radial-gradient(1px 1px at 66% 8%, #fff, transparent),
    radial-gradient(1px 1px at 91% 44%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 48% 90%, #fff, transparent),
    radial-gradient(1px 1px at 5% 48%, #fff, transparent);
  background-size: 320px 320px;
  opacity: 0.55;
  animation: drift 90s linear infinite;
}

.stars--near {
  background-image:
    radial-gradient(2px 2px at 18% 40%, #fff, transparent),
    radial-gradient(2px 2px at 52% 22%, #fff, transparent),
    radial-gradient(2px 2px at 70% 70%, #fff, transparent),
    radial-gradient(2px 2px at 86% 16%, #fff, transparent),
    radial-gradient(2.5px 2.5px at 40% 78%, #fff, transparent),
    radial-gradient(2px 2px at 8% 8%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 63% 48%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 28% 68%, #a8d8ff, transparent);
  background-size: 480px 480px;
  opacity: 0.85;
  animation: drift 60s linear infinite reverse, twinkle 4s ease-in-out infinite alternate;
}

.sky__astronaut {
  position: absolute;
  left: max(0.25rem, env(safe-area-inset-left));
  bottom: 0;
  width: min(118px, 28vw);
  height: auto;
  opacity: 0.55;
  transform: scaleX(-1) translateZ(0);
  transform-origin: bottom center;
  /* sombra via box-shadow no wrapper não aplica em img; glow leve estático */
  filter: drop-shadow(0 0 12px rgba(126, 200, 255, 0.18));
  user-select: none;
}

@keyframes twinkle {
  from {
    opacity: 0.55;
  }
  to {
    opacity: 0.95;
  }
}

/* transform = GPU; background-position = repaint (trava) */
@keyframes drift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(-8%, -5%, 0);
  }
}

.page {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 1.75rem 1rem 3.5rem;
  text-align: center;
}

.logo {
  display: block;
  width: min(250px, 72vw);
  height: auto;
  margin: 0 auto 1.25rem;
  filter: drop-shadow(0 0 18px rgba(120, 90, 255, 0.25));
}

.title {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.45rem 0.65rem;
  margin: 0 0 2.25rem;
  font-size: clamp(1.2rem, 5.2vw, 1.55rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.title__main {
  color: #fff;
}

.title__sep {
  color: rgba(255, 255, 255, 0.35);
  font-weight: 500;
}

.title__brand {
  background: linear-gradient(90deg, #7ec8ff 0%, #c084fc 45%, #ff6bb5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: -1.25rem auto 2.25rem;
  max-width: 34rem;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.72);
}

.aula {
  margin-bottom: 2.5rem;
}

.aula__heading {
  margin: 0 0 0.9rem;
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.92);
}

.aula__label {
  background: linear-gradient(90deg, #7ec8ff, #c084fc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.aula__video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(192, 132, 252, 0.55);
  border-radius: 18px;
  overflow: hidden;
  background: rgba(8, 8, 16, 0.85);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04) inset,
    0 12px 40px rgba(0, 0, 0, 0.55),
    0 0 28px rgba(126, 200, 255, 0.12);
}

.aula__video iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.cta-finish {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 28rem;
  min-height: 3rem;
  margin: 0.5rem auto 0;
  padding: 0.95rem 1.25rem;
  border-radius: 12px;
  background: linear-gradient(90deg, #7ec8ff 0%, #c084fc 55%, #ff6bb5 100%);
  color: #0a0614;
  font-weight: 800;
  font-size: 1rem;
  text-decoration: none;
  letter-spacing: 0.01em;
  box-shadow: 0 0 28px rgba(192, 132, 252, 0.28);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.cta-finish:hover {
  filter: brightness(1.06);
}

.cta-finish:active {
  transform: scale(0.98);
}

.cta-finish:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

@media (min-width: 640px) {
  .sky__astronaut {
    left: 1rem;
    bottom: 0;
    width: 150px;
    opacity: 0.7;
  }

  .page {
    padding: 2.75rem 1.5rem 4rem;
  }

  .logo {
    width: 300px;
    margin-bottom: 1.5rem;
  }

  .title {
    font-size: 2rem;
    margin-bottom: 2.75rem;
    gap: 0.55rem 0.85rem;
  }

  .subtitle {
    margin-top: -1.5rem;
    margin-bottom: 2.75rem;
    font-size: 1.05rem;
  }

  .aula {
    margin-bottom: 3rem;
  }

  .aula__heading {
    font-size: 1.05rem;
  }

  .aula__video {
    border-radius: 20px;
  }
}

@media (min-width: 960px) {
  .sky__astronaut {
    left: 1.5rem;
    bottom: 0;
    width: 180px;
    opacity: 0.8;
  }

  .title {
    font-size: 2.35rem;
  }

  .logo {
    width: 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .stars--far,
  .stars--near {
    animation: none;
  }
}