:root {
  --primary: #009688;
  --accent: #00bcd4;
  --bg: #fcfcfb;
  --text: #333;
  --radius: .75rem;
  --gap: 1rem;
  /* Nuevas variables para sombras y perspectiva */
  --shadow-color: rgba(0,0,0,0.2);
  --perspective: 800px;
}

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

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  perspective: var(--perspective);
}

a { text-decoration: none; }

nav {
  background: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,.05);
}

/* --- Navegación y botones con 3D sutil --- */
.nav-link {
  color: var(--text);
  padding: .75rem 1rem;
  transition: transform .2s, background .2s;
  transform-style: preserve-3d;
}
.nav-link:hover {
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  transform: translateZ(5px) rotateX(3deg);
}

.btn-gradient, .btn-outline {
  border-radius: var(--radius);
  padding: .75rem 1.5rem;
  transition: transform .3s, box-shadow .3s;
  transform-style: preserve-3d;
}
.btn-gradient {
  background: linear-gradient(90deg, var(--accent), var(--primary));
  color: #fff;
  border: none;
  box-shadow: 0 4px 10px var(--shadow-color), inset 0 -2px 4px rgba(0,0,0,.2);
}
.btn-gradient:hover {
  opacity: .9;
  transform: translateZ(10px) rotateX(2deg);
}
.btn-outline {
  border: 2px solid var(--accent);
  color: var(--accent);
  background: transparent;
  box-shadow: 0 4px 8px rgba(0,0,0,.1);
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
  transform: translateZ(8px) rotateX(1deg);
}

/* Hero: overlay + latidos 3D */
.hero {
  position: relative;
  text-align: center;
  color: #fff;
  perspective: var(--perspective);
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.5);
}
.hero-content {
  z-index: 2;
  position: relative;
  padding: 6rem 1rem;
  animation: fadeIn 1s ease-out;
  transform-style: preserve-3d;
}
.hero h1 {
  font-size: 2.5rem;
  animation: heartbeat 2s infinite;
}
.hero p {
  font-size: 1.25rem;
  margin: 1rem 0 2rem;
}

@keyframes heartbeat {
  0%,100% { transform: scale(1) translateZ(0); }
  50%  { transform: scale(1.05) translateZ(20px); }
}

/* Secciones y animaciones generales */
.section { padding: 4rem 1rem; }
.bg-light { background: #f1f7f6; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* --- Iconos con sombras y tilt 3D --- */
.feature-box {
  display: flex;
  gap: var(--gap);
  align-items: start;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeIn 1s ease-out forwards;
  transform-style: preserve-3d;
  perspective: var(--perspective);
}
.feature-box:nth-child(1) { animation-delay: .3s; }
.feature-box:nth-child(2) { animation-delay: .6s; }

.icon {
  font-size: 2rem;
  color: var(--accent);
  margin-right: .5rem;
  text-shadow: 2px 2px 4px var(--shadow-color);
  filter: drop-shadow(2px 2px 4px var(--shadow-color));
  transition: transform .3s ease, filter .3s ease;
  transform-style: preserve-3d;
}
.icon:hover {
  transform: scale(1.3) rotateY(20deg) rotateX(10deg) translateZ(10px);
  filter: drop-shadow(4px 4px 8px var(--shadow-color));
}

/* Hashtags con pop 3D */
.hashtags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  justify-content: center;
  margin: 2rem 0;
  perspective: var(--perspective);
}
.hashtag {
  background: #eef7f6;
  color: var(--primary);
  padding: .5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform .2s, box-shadow .2s;
  transform-style: preserve-3d;
  box-shadow: 0 2px 4px var(--shadow-color);
}
.hashtag:hover {
  transform: scale(1.15) rotateX(5deg) translateZ(8px);
  box-shadow: 0 6px 12px var(--shadow-color);
}

/* --- Partners: tarjetas que flotan y rotan --- */
.partners .card {
  border: none;
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  background: #fff;
  opacity: 0;
  animation: fadeIn 1s ease-out forwards;
  transform: perspective(800px) rotateX(0deg) rotateY(0deg);
  transform-style: preserve-3d;
  box-shadow: 0 4px 10px rgba(0,0,0,.1), 0 8px 20px rgba(0,0,0,.05);
  transition: transform .4s ease, box-shadow .4s ease;
}
.partners .card:nth-child(1) { animation-delay: .2s; }
.partners .card:nth-child(2) { animation-delay: .4s; }
.partners .card:nth-child(3) { animation-delay: .6s; }
.partners .card:nth-child(4) { animation-delay: .8s; }
.partners .card:nth-child(5) { animation-delay: 1s; }
.partners .card:nth-child(6) { animation-delay: 1.2s; }
.partners .card:nth-child(7) { animation-delay: 1.4s; }

.partners .card:hover {
  transform: perspective(800px) rotateX(8deg) rotateY(-8deg) scale(1.05);
  box-shadow: 0 8px 20px rgba(0,0,0,.15), 0 16px 40px rgba(0,0,0,.1);
}
.partners img {
  max-width: 80px;
  margin-bottom: .5rem;
  transition: transform .3s;
}
.partners img:hover {
  transform: rotateY(20deg) translateZ(10px);
}

/* Footer con fadeIn */
footer {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: 2rem 1rem;
  animation: fadeIn 1s ease-out;
}

/* Responsive tweaks */
@media(min-width:768px){
  .hero h1 { font-size: 3.5rem; }
  .hero p  { font-size: 1.5rem; }
}