.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.85);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(6px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.nav.nav--lang-only {
  justify-content: flex-end;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
}

.nav--home .logo-img {
  height: 130px;
}

.nav--simple .logo-img {
  height: 130px;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg-elev);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease;
  }

  .nav-links.is-open {
    max-height: 300px;
  }

  .nav-links a {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--color-border);
  }

  .nav--home {
    flex-wrap: wrap;
    row-gap: 0.5rem;
  }

  .nav--home .logo {
    flex: 1 0 100%;
    text-align: center;
  }

  .nav--home .logo-img {
    height: 110px;
  }

  .nav--simple {
    flex-wrap: wrap;
    row-gap: 0.5rem;
  }

  .nav--simple .logo {
    flex: 1 0 100%;
    text-align: center;
  }

  .nav--simple .logo-img {
    width: 100%;
    height: auto;
  }

  .nav--simple .lang-switch {
    flex: 1 0 100%;
    text-align: center;
  }
}

.lang-switch {
  font-size: 0.9rem;
  color: var(--color-text-mute);
}

.lang-switch a {
  color: var(--color-text);
  text-decoration: underline;
}

.lang-current {
  font-weight: 600;
  color: var(--color-text);
}

/* Sections */
section {
  padding: var(--space-section) 0;
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
}

/* Hero */
.hero {
  padding: calc(var(--space-section) * 1.3) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-video-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-video-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hero .container {
  position: relative;
  z-index: 1;
}

/* Quiénes somos: imagen protagonista arriba, cards en fila debajo */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.about-media video {
  width: 100%;
  max-height: 520px;
  object-fit: cover;
  border-radius: var(--radius);
}

.about-grid .about-cards {
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-grid .about-cards {
    grid-template-columns: 1fr;
  }
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--color-text-mute);
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Generic grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.grid-5 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.grid-5 .card {
  width: 100%;
  max-width: 776px;
}

.grid-5 .card:last-child {
  grid-column: 1 / -1;
  justify-self: center;
}

.grid-5 .card--vertical {
  width: min(405px, 100%);
  margin: 0 auto;
  box-sizing: border-box;
  justify-self: center;
}

.grid-6 {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1.25rem;
}

/* Grid dedicado a cards con imagen protagonista (El Ecosistema, Vital Zone) */
.grid-media-2 {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.grid-media-2 .card {
  flex: 0 1 420px;
}

@media (max-width: 992px) {
  .grid-4, .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 769px) and (max-width: 992px) {
  #por-que .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-3, .grid-4, .grid-5, .grid-6 {
    grid-template-columns: 1fr;
  }
}

main {
  position: relative;
  z-index: 1;
}

/* Footer */
.site-footer {
  padding: 3rem 0 2rem;
  text-align: center;
  color: var(--color-text-mute);
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.footer-disclaimer {
  max-width: 640px;
  margin: 0 auto;
  font-size: 0.8rem;
  line-height: 1.5;
}