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

/* BODY - FONDO PROFUNDO */
body {
  font-family: 'Inter', sans-serif;
  background:
    radial-gradient(circle at 20% 30%, #1e3a8a, transparent 40%),
    radial-gradient(circle at 80% 20%, #00f5a0, transparent 30%),
    radial-gradient(circle at 70% 80%, #0ea5e9, transparent 40%),
    #05070d;
  color: white;
  overflow-x: hidden;
}

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  padding: 30px 60px;
}

header h1 {
  font-size: 18px;
  font-weight: 500;
}

/* BOTÓN HEADER */
.btn-top {
  background: white;
  color: black;
  padding: 8px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
}

/* HERO */
.hero {
  text-align: center;
  padding: 200px 20px 140px;
}

.hero h2 {
  font-size: 68px;
  font-weight: 600;
  max-width: 900px;
  margin: auto;
  letter-spacing: -2px;
}

.hero p {
  margin-top: 20px;
  font-size: 18px;
  opacity: 0.7;
}

/* BOTÓN PRINCIPAL */
.cta {
  display: inline-block;
  margin-top: 40px;
  padding: 18px 40px;
  border-radius: 999px;
  background: linear-gradient(90deg, #00d4ff, #6effc7);
  color: black;
  text-decoration: none;
  font-weight: 600;
  transition: 0.3s ease;
}

.cta:hover {
  transform: scale(1.08);
  box-shadow: 0 0 40px rgba(0,255,200,0.6);
}

.cta.big {
  font-size: 16px;
}

/* ABOUT */
.about {
  text-align: center;
  padding: 120px 20px 60px;
}

.about p {
  margin-top: 10px;
  opacity: 0.6;
}

/* FEATURES */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 1100px;
  margin: 60px auto;
}

/* CARDS */
.card {
  padding: 40px 30px;
  border-radius: 20px;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(20px);
  text-align: center;
  transition: 0.3s ease;
}

.card:hover {
  transform: translateY(-12px) scale(1.03);
  box-shadow: 0 30px 60px rgba(0,0,0,0.6);
}

/* ICON */
.icon {
  font-size: 34px;
  margin-bottom: 15px;
}

/* CTA FINAL */
.cta-final {
  text-align: center;
  padding: 160px 20px;
}

.cta-final p {
  opacity: 0.6;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 40px;
  opacity: 0.3;
}

/* ANIMACIONES */
.fade {
  opacity: 0;
  transform: translateY(40px);
  animation: fadeUp 1s ease forwards;
}

.fade:nth-child(1) { animation-delay: 0.2s; }
.fade:nth-child(2) { animation-delay: 0.4s; }
.fade:nth-child(3) { animation-delay: 0.6s; }
.fade:nth-child(4) { animation-delay: 0.8s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* RESPONSIVE */
@media (max-width: 768px) {

  .hero h2 {
    font-size: 42px;
  }

  .features {
    grid-template-columns: 1fr;
  }

  header {
    padding: 20px;
  }
}