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CSS

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HTML 

              
                <html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Responsive and Semantic CSS Grid CSS-Driven</title>
	</head>
	<body>
		<header>
			<div class="brand">
				
				<div class="logo component">
					<h3>Bruno Lesieur</h3>
				</div>

			</div>
			<div class="slogan">
				
				<div class="markdown component">
					<p>Some #ID with lot of .CLASS</p>
				</div>

			</div>
			<div class="title">
				
				<div class="logo component">
					<h1>Quelque #ID et beaucoup de .CLASS</h1>
				</div>	

			</div>
			<nav class="main-nav">
				
				<div class="navigation component">
					<ul>
						<li><a href="">Home</a></li>
						<li><a href="">Section A</a></li>
						<li><a href="">Section B</a></li>
						<li><a href="">Section C</a></li>
					</ul>
				</div>		

			</nav>
		</header>
		<div class="content">
			<section class="overview">
				
				<div class="carousel component">
					<h1>Slide 1</h1>
					<p>Bla bla bla</p>
				</div>	

			</section>
			<nav class="anchor-nav">
				
				<div class="navigation component">
					<h2>Summary</h2>
					<ul>
						<li>
							<a href="#h1-title">H1 Title</a>
							<ul>
								<li>
									<a href="#h2-title">H2 Title</a>
									<ul>
										<li><a href="#h3-title-1">H3 Title 1</a></li>
										<li><a href="#h3-title-2">H3 Title 1</a></li>
									</ul>
								</li>
							</ul>
						</li>
					</ul>
				</div>

			</nav>
			<article class="main">
				<div class="article">

					<div class="markdown component">
						<header>
							<h1 id="h1-title">H1 Title</h1>
							<p>This is a leading text for my article</p>
						</header>

						<h2 id="h2-title">H2 Title</h2>
						<p>Bla bla bla</p>

						<h3 id="h3-title-1">H3 Title 1</h3>
						<p>Bla bla bla</p>

						<h3 id="h3-title-2">H3 Title 2</h3>
						<p>Bla bla bla</p>

						<header>
							<footer>
								<p>by <a href="">Haeresis</a></p>
								<p>date, etc</a></p>
							</footer>
						</header>
					</div>

				</div>
				<ul class="step-list">
					<li class="step">

						<div class="markdown component">
							<h3>H3 Step</h3>
							<p>Bla bla bla</p>
						</div>

					</li>
					<li class="step">
						
						<div class="markdown component">
							<h3>H3 Step</h3>
							<p>Bla bla bla</p>
						</div>

					</li>
					<li class="step">
						
						<div class="markdown component">
							<h3>H3 Step</h3>
							<p>Bla bla bla</p>
						</div>

					</li>
				</ul>
			</article>
			<ul class="call-to-action-list">
				<li class="call-to-action">
					
					<div class="markdown component">
						<h2>H2 Action</h2>
						<p>Bla bla bla</p>
					</div>

				</li>
				<li class="call-to-action">
		
					<div class="markdown component">
						<h2>H2 Action</h2>
						<p>Bla bla bla</p>
					</div>			

				</li>
				<li class="call-to-action">
		
					<div class="markdown component">
						<h2>H2 Action</h2>
						<p>Bla bla bla</p>
					</div>			

				</li>
			</ul>
		</div>
		<footer>
			<nav class="secondary-nav">
				
				<div class="navigation component">
					<ul>
						<li>
							<a href="">Contact us</a>
						</li>
					</ul>
				</div>

			</nav>
			<div class="utils">
				
				<div class="markdown component">
					<p>Join us on Google+</p>
				</div>	

			</div>
			<div class="legals">
				
				<div class="markdown component">
					<p>©All Right not reserved at all</p>
				</div>	

			</div>
		</footer>
	<body>
</html>
!

CSS 

              
                /*------------------------------------*\
    $SUMMARY
\*------------------------------------*/

/**
 * SUMMARY.................It's me !
 * RESET...................Same render for all browser.
 * TEST....................Some activable or desactivale CSS rules for debug.
 * GRID....................Grid base 12 columns.
 * ALIGNMENT...............Align content of colums.
 * VISTIBLE / HIDDEN.......Hide / Display colums.
 */





/*------------------------------------*\
    $RESET
\*------------------------------------*/

* {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}





/*------------------------------------*\
    $TEST
\*------------------------------------*/

.brand:before,
.slogan:before,
.title:before,
.main-nav:before,
.overview:before,
.anchor-nav:before,
.main:before,
.call-to-action:before,
.secondary-nav:before,
.legals:before,
.utils:before {
   width: 100%;
   display: inline-block;
}

.brand:before {
    content: "Brand";
   background-color: rgba(0, 0, 150, 0.5);
}
.slogan:before {
   content: "Slogan";
   background-color: rgba(150, 150, 0, 0.5);
}
.title:before {
   content: "Title";
   background-color: rgba(255, 0, 0, 0.2);
}
.main-nav:before {
   content: "Nav";
   background-color: rgba(0, 255, 0, 0.2);
}
.overview:before {
   content: "Overview";
   background-color: rgba(150, 0, 0, 0.5);
}
.anchor-nav:before {
   content: "Anchor nav";
   background-color: rgba(0, 0, 255, 0.2);
}
.main:before {
   content: "Main";
   background-color: rgba(255, 255, 0, 0.2);
}
.call-to-action:before {
   content: "Call to action";
   background-color: rgba(255, 0, 255, 0.2);
}
.secondary-nav:before {
   content: "Secondary nav";
   background-color: rgba(0, 150, 0, 0.5);
}
.legals:before {
   content: "Legals";
   background-color: rgba(0, 255, 255, 0.2);
}
.utils:before {
   content: "Utils";
   background-color: rgba(150, 0, 150, 0.5);
}
.main:before {
  content: none;
}
.article:before {
  content: "Article";
  background-color: rgba(255, 255, 0, 0.2);
  width: 100%;
  display: inline-block;
}
.step:before {
  content: "Step";
  background-color: rgba(0, 255, 0, 0.2);
  width: 100%;
  display: inline-block;
}





/*------------------------------------*\
    $GRID
\*------------------------------------*/

/*
.span12-12 { width: 100%; }
.span12-11 { width: 91.66666667%; }
.span12-10 { width: 83.33333333%; }
.span12-9 { width: 75%; }
.span12-8 { width: 66.66666667%; }
.span12-7 { width: 58.33333333%; }
.span12-6 { width: 50%; }
.span12-5 { width: 41.66666667%; }
.span12-4 { width: 33.33333333%; }
.span12-3 { width: 25%; }
.span12-2 { width: 16.66666667%; }
.span12-1 { width: 8.33333333%; }

.pull12-12 { right: 100%; }
.pull12-11 { right: 91.66666667%; }
.pull12-10 { right: 83.33333333%; }
.pull12-9 { right: 75%; }
.pull12-8 { right: 66.66666667%; }
.pull12-7 { right: 58.33333333%; }
.pull12-6 { right: 50%; }
.pull12-5 { right: 41.66666667%; }
.pull12-4 { right: 33.33333333%; }
.pull12-3 { right: 25%; }
.pull12-2 { right: 16.66666667%; }
.pull12-1 { right: 8.33333333%; }
.pull12-0 { right: 0; }

.push12-12 { left: 100%; }
.push12-11 { left: 91.66666667%; }
.push12-10 { left: 83.33333333%; }
.push12-9 { left: 75%; }
.push12-8 { left: 66.66666667%; }
.push12-7 { left: 58.33333333%; }
.push12-6 { left: 50%; }
.push12-5 { left: 41.66666667%; }
.push12-4 { left: 33.33333333%; }
.push12-3 { left: 25%; }
.push12-2 { left: 16.66666667%; }
.push12-1 { left: 8.33333333%; }
.push12-0 { left: 0; }

.prepend12-12 { margin-left: 100%; }
.prepend12-11 { margin-left: 91.66666667%; }
.prepend12-10 { margin-left: 83.33333333%; }
.prepend12-9 { margin-left: 75%; }
.prepend12-8 { margin-left: 66.66666667%; }
.prepend12-7 { margin-left: 58.33333333%; }
.prepend12-6 { margin-left: 50%; }
.prepend12-5 { margin-left: 41.66666667%; }
.prepend12-4 { margin-left: 33.33333333%; }
.prepend12-3 { margin-left: 25%; }
.prepend12-2 { margin-left: 16.66666667%; }
.prepend12-1 { margin-left: 8.33333333%; }
.prepend12-0 { margin-left: 0; }

.append12-12 { margin-right: 100%; }
.append12-11 { margin-right: 91.66666667%; }
.append12-10 { margin-right: 83.33333333%; }
.append12-9 { margin-right: 75%; }
.append12-8 { margin-right: 66.66666667%; }
.append12-7 { margin-right: 58.33333333%; }
.append12-6 { margin-right: 50%; }
.append12-5 { margin-right: 41.66666667%; }
.append12-4 { margin-right: 33.33333333%; }
.append12-3 { margin-right: 25%; }
.append12-2 { margin-right: 16.66666667%; }
.append12-1 { margin-right: 8.33333333%; }
.append12-0 { margin-right: 0; }

.pull-push { position: relative; }
.gutter { padding-left: 16px; padding-right: 16px; }
.pull-push-reset { position: static; }
.gutter-reset { padding-left: 0; padding-right: 0; }
.list-reset { margin: 0;padding: 0;list-style-type: none; }
.clearfix { clear: both; }
*/

body > header,
body > footer,
.content {
  max-width: 1200px;
  margin-left:auto;
  margin-right:auto;
}

    body > header:after,
    body > footer:after,
    .content:after,
.grid:after {
    content: "";
    clear: both;
    display: block;
}

    .brand,
    .slogan,
    .title,
    .main-nav,
    .overview,
    .anchor-nav,
    .main,
    .article,
    .step,
    .call-to-action,
    .secondary-nav,
    .utils,
    .legals,
.column {
    float: left;
    width: 100%;
}

/* Mobile / Small tablet */
  .brand,
  .slogan,
  .title,
  .main-nav,
  .overview,
  .anchor-nav,
   .article,
  .step,
  .call-to-action,
  .secondary-nav,
  .utils,
  .legals,
.gutter { padding-left: 16px; padding-right: 16px; }

    .step-list,
    .call-to-action-list,
.list-reset { margin: 0;padding: 0;list-style-type: none; }

    .title,
.clearfix { clear: both; }

/* Tablet / Small desktop */
@media (min-width: 768px) {
  .brand,
  .title,
.span12-2 { width: 16.66666667%; }
  .anchor-nav,
  .utils,
.span12-3 { width: 25%; }
  .step,
.span12-4 { width: 33.33333333%; }  
  .call-to-action,
.span12-6 { width: 50%; }
  .legals,
  .main,
.span12-9 { width: 75%; }
  .main-nav,
  .slogan,
.span12-10 { width: 83.33333333%; }

  .utils,
  .legals,
  .brand,
  .slogan,
.pull-push { position: relative; }

  .utils,
.push12-9 { left: 75%; }
  .brand,
.push12-10 { left: 83.33333333%; }
  .slogan,
.pull12-2 { right: 16.66666667%; }
  .legals,
.pull12-3 { right: 25%; }
}

/* Desktop */
@media (min-width: 992px) {
  .anchor-nav,  
  .call-to-action,
.span12-4 { width: 33.33333333%; }
  .main,
.span12-8 { width: 66.66666667%; }
}

/* Large desktop */
@media (min-width: 1200px) {
  .anchor-nav,
.span12-3 { width: 25%; }
  .call-to-action,
.span12-4 { width: 33.33333333%; }
  .main,
.span12-9 { width: 75%; }

    .call-to-action:nth-child(odd),
.prepend12-2 { margin-left: 16.66666667%; }
/**/
    .call-to-action:nth-child(even),
.append12-2 { margin-right: 16.66666667%; }
}





/*------------------------------------*\
    $ALIGMENT
\*------------------------------------*/

/*
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }
*/

/* Mobile / Small tablet */
    .utils,
.text-center { text-align: center; }

/* Tablet / Small desktop */
@media (min-width: 768px) {
    .brand,
   .utils,
.text-right { text-align: right; }
}




  
/*------------------------------------*\
    $VISTIBLE / HIDDEN
\*------------------------------------*/

/*
.display-block, visible { display: block; }
.display-inline { display: inline-block; }
.display-inline-block { display: inline-block; }
...
.display-none, hidden { display: none; }
*/

/* Mobile / Small tablet */
    .step,
.display-none, hidden { display: none; }

/* Tablet / Small desktop */
@media (min-width: 768px) {
    .step,
.display-block, visible { display: block; }
    .call-to-action:nth-child(n + 3),
.display-none, hidden { display: none; }
}

/* Desktop */
@media (min-width: 992px) {
    .call-to-action:nth-child(n + 3),
.display-block, visible { display: block; }
}

/* Large desktop */
@media (min-width: 1200px) {
    .call-to-action:nth-child(n + 3),
.display-none, hidden { display: none; }
}
!

JS
!
999px

Console