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HTML 

              
                main#main

  header
    h1
      img(src='http://apkestudio.com/wp-content/themes/apk-estudio-theme/img/logo-header.svg' alt='Logo')

    nav#navegacion
      ul
        li: a(href='#acerca' class='activo') Acerca
        li: a(href='#servicios') Servicios
        li: a(href='#portafolio') Portafolio
        li: a(href='#contacto') Contacto

   section#contenido
     article#acerca.bloque.visible
       h2 Acerca de mí
       p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin dignissim dolor vitae tellus elementum condimentum. Nullam fermentum ultrices lacus et luctus. Nulla facilisi. Pellentesque mattis consectetur dui sit amet sagittis. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Mauris cursus mollis ornare. Vestibulum est dolor, imperdiet ut faucibus cursus, aliquet varius enim. In venenatis eu eros nec suscipit. Sed rutrum mauris dui, at vehicula elit porta sit amet. Praesent non justo ac est rutrum rutrum non hendrerit justo. Aliquam erat volutpat. Vestibulum feugiat eget massa ac condimentum.

     article#servicios.bloque
       h2 Servicios creativos
       p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin dignissim dolor vitae tellus elementum condimentum. Nullam fermentum ultrices lacus et luctus. Nulla facilisi. Pellentesque mattis consectetur dui sit amet sagittis. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Mauris cursus mollis ornare. Vestibulum est dolor, imperdiet ut faucibus cursus, aliquet varius enim. In venenatis eu eros nec suscipit. Sed rutrum mauris dui, at vehicula elit porta sit amet. Praesent non justo ac est rutrum rutrum non hendrerit justo. Aliquam erat volutpat. Vestibulum feugiat eget massa ac condimentum.

     article#portafolio.bloque
       h2 Portafolio de trabajos
       p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin dignissim dolor vitae tellus elementum condimentum. Nullam fermentum ultrices lacus et luctus. Nulla facilisi. Pellentesque mattis consectetur dui sit amet sagittis. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Mauris cursus mollis ornare. Vestibulum est dolor, imperdiet ut faucibus cursus, aliquet varius enim. In venenatis eu eros nec suscipit. Sed rutrum mauris dui, at vehicula elit porta sit amet. Praesent non justo ac est rutrum rutrum non hendrerit justo. Aliquam erat volutpat. Vestibulum feugiat eget massa ac condimentum.

     article#contacto.bloque
       h2 Contáctame
       p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin dignissim dolor vitae tellus elementum condimentum. Nullam fermentum ultrices lacus et luctus. Nulla facilisi. Pellentesque mattis consectetur dui sit amet sagittis. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Mauris cursus mollis ornare. Vestibulum est dolor, imperdiet ut faucibus cursus, aliquet varius enim. In venenatis eu eros nec suscipit. Sed rutrum mauris dui, at vehicula elit porta sit amet. Praesent non justo ac est rutrum rutrum non hendrerit justo. Aliquam erat volutpat. Vestibulum feugiat eget massa ac condimentum.
!

CSS 

              
                @verde: #94c01f;
@gris: #f4f4f4;

body {
  font-family: georgia;
  line-height: 1.6em;
}

h1 {
  font-size: 1em;
  margin: 2em 0;
}

h2 {
  text-align: center;
  font-weight: 300;
  text-transform: uppercase;
  margin: 0 0 2em 0;
  
  &::before,
  &::after {
    content: ' – '
  }
}

#main {
  max-width: 900px;
  width: 90%;
  margin: 2em auto;
  background: white;
}

header {
  text-align: center;
}

nav {
  border-top: solid 2px darken(@gris, 20%);
  padding-top: 1em;
  
  ul {
    margin: 0;
    padding: 0;
    list-style: none;
    
    li {
      display: inline-block;
      
      a {
        display: block;
        color: @verde;
        padding: 1em;
        text-decoration: none;
        text-transform: uppercase;
        font-size: 0.9em;
        border-radius: 0.3em;
        
        &:hover {
          background: @gris;
          color: black;
        }
        
        &.activo {
          background: @verde;
          color: white;
          
          //Animación
          animation: enlace-menu 500ms ease-in-out forwards;
        }
      }
    }
  }
}

#contenido {
  margin-top: 1em;
  border-top: solid 2px darken(@gris, 20%);
  perspective: 1000px;
}

.bloque {
  background: @gris;
  padding: 3em 2em;
  display: none;
  
  p {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }
  
  &.visible {
    display: block;
    
    //Animacion
    animation: bloque-visible 500ms ease-in-out forwards;
    transform-origin: top center;
  }
}

@keyframes bloque-visible {
  
  0% {
    opacity: 0;
    transform: rotateX(-90deg);
  }
  
  60% {
    transform: rotateX(20deg);
  }
  
  75% {
    transform: rotateX(-10deg);
  }
  
  90% {
    transform: rotateX(5deg);
  }
  
  100% {
    opacity: 1;
    transform: rotateX(0deg);
  }
  
  
}



@keyframes enlace-menu {
  
  0% {
    transform: scale(0.8);
  }
  
  70% {
    transform: scale(1.1);
  }
  
  85% {
    transform: scale(0.95);
  }

  100% {
    transform: scale(1);
  }
  
  
}
!

JS 

              
                jQuery('document').ready(function($){
  
  var bloques = $('.bloque'),
      enlaces = $('#navegacion').find('a');
  
  enlaces.click(function(e){
    
    e.preventDefault();
    
    var hash = $(this).attr('href');
    
    bloques
      .filter(hash)
      .addClass('visible')
      .siblings()
      .removeClass('visible');
    
    enlaces
      .removeClass('activo');
    
    $(this)
      .addClass('activo');
    
  });
  
});
!
999px

Console