Merge pull request #23 from picturepan2/feature/add-responsive-grid

Feature/add responsive grid

8 files changed, 500 insertions, 196 deletions

diff --git a/bower.json b/bower.json
index 5976d23..a95919c 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "spectre.css",
-  "version": "0.1.12",
+  "version": "0.1.13",
   "description": "Spectre.css: a lightweight, responsive and modern CSS framework.",
   "homepage": "http://picturepan2.github.io/spectre",
   "repository": "picturepan2/spectre",
diff --git a/dist/spectre.css b/dist/spectre.css
index 549cdb7..7b34694 100644
--- a/dist/spectre.css
+++ b/dist/spectre.css
@@ -537,14 +537,19 @@ pre code {
   }
 }
 .columns {
-  display: block;
+  display:         flex;
+  display: -ms-flexbox;
+  display: -webkit-flex;
+  -webkit-flex-wrap: wrap;
+      -ms-flex-wrap: wrap;
+          flex-wrap: wrap;
   margin-left: -1rem;
   margin-right: -1rem;
 }
 .column {
-  -webkit-flex: 1;
-      -ms-flex: 1;
-          flex: 1;
+  -webkit-flex: 1 0 auto;
+      -ms-flex: 1 0 auto;
+          flex: 1 0 auto;
   padding: 1rem;
 }
 .column.col-12,
@@ -563,73 +568,228 @@ pre code {
       -ms-flex: none;
           flex: none;
 }
+.col-12 {
+  width: 100%;
+}
+.col-11 {
+  width: 91.66666667%;
+}
+.col-10 {
+  width: 83.33333333%;
+}
+.col-9 {
+  width: 75%;
+}
+.col-8 {
+  width: 66.66666667%;
+}
+.col-7 {
+  width: 58.33333333%;
+}
+.col-6 {
+  width: 50%;
+}
+.col-5 {
+  width: 41.66666667%;
+}
+.col-4 {
+  width: 33.33333333%;
+}
+.col-3 {
+  width: 25%;
+}
+.col-2 {
+  width: 16.66666667%;
+}
+.col-1 {
+  width: 8.33333333%;
+}
+@media screen and (min-width: 481px) {
+  .col-xs-12,
+  .col-xs-11,
+  .col-xs-10,
+  .col-xs-9,
+  .col-xs-8,
+  .col-xs-7,
+  .col-xs-6,
+  .col-xs-5,
+  .col-xs-4,
+  .col-xs-3,
+  .col-xs-2,
+  .col-xs-1 {
+    -webkit-flex: none;
+        -ms-flex: none;
+            flex: none;
+  }
+  .col-xs-12 {
+    width: 100%;
+  }
+  .col-xs-11 {
+    width: 91.66666667%;
+  }
+  .col-xs-10 {
+    width: 83.33333333%;
+  }
+  .col-xs-9 {
+    width: 75%;
+  }
+  .col-xs-8 {
+    width: 66.66666667%;
+  }
+  .col-xs-7 {
+    width: 58.33333333%;
+  }
+  .col-xs-6 {
+    width: 50%;
+  }
+  .col-xs-5 {
+    width: 41.66666667%;
+  }
+  .col-xs-4 {
+    width: 33.33333333%;
+  }
+  .col-xs-3 {
+    width: 25%;
+  }
+  .col-xs-2 {
+    width: 16.66666667%;
+  }
+  .col-xs-1 {
+    width: 8.33333333%;
+  }
+}
+@media screen and (min-width: 601px) {
+  .col-sm-12,
+  .col-sm-11,
+  .col-sm-10,
+  .col-sm-9,
+  .col-sm-8,
+  .col-sm-7,
+  .col-sm-6,
+  .col-sm-5,
+  .col-sm-4,
+  .col-sm-3,
+  .col-sm-2,
+  .col-sm-1 {
+    -webkit-flex: none;
+        -ms-flex: none;
+            flex: none;
+  }
+  .col-sm-12 {
+    width: 100%;
+  }
+  .col-sm-11 {
+    width: 91.66666667%;
+  }
+  .col-sm-10 {
+    width: 83.33333333%;
+  }
+  .col-sm-9 {
+    width: 75%;
+  }
+  .col-sm-8 {
+    width: 66.66666667%;
+  }
+  .col-sm-7 {
+    width: 58.33333333%;
+  }
+  .col-sm-6 {
+    width: 50%;
+  }
+  .col-sm-5 {
+    width: 41.66666667%;
+  }
+  .col-sm-4 {
+    width: 33.33333333%;
+  }
+  .col-sm-3 {
+    width: 25%;
+  }
+  .col-sm-2 {
+    width: 16.66666667%;
+  }
+  .col-sm-1 {
+    width: 8.33333333%;
+  }
+}
 @media screen and (min-width: 841px) {
-  .columns {
-    display:         flex;
-    display: -ms-flexbox;
-    display: -webkit-flex;
+  .col-md-12,
+  .col-md-11,
+  .col-md-10,
+  .col-md-9,
+  .col-md-8,
+  .col-md-7,
+  .col-md-6,
+  .col-md-5,
+  .col-md-4,
+  .col-md-3,
+  .col-md-2,
+  .col-md-1 {
+    -webkit-flex: none;
+        -ms-flex: none;
+            flex: none;
   }
-  .col-12 {
+  .col-md-12 {
     width: 100%;
   }
-  .col-11 {
+  .col-md-11 {
     width: 91.66666667%;
   }
-  .col-10 {
+  .col-md-10 {
     width: 83.33333333%;
   }
-  .col-9 {
+  .col-md-9 {
     width: 75%;
   }
-  .col-8 {
+  .col-md-8 {
     width: 66.66666667%;
   }
-  .col-7 {
+  .col-md-7 {
     width: 58.33333333%;
   }
-  .col-6 {
+  .col-md-6 {
     width: 50%;
   }
-  .col-5 {
+  .col-md-5 {
     width: 41.66666667%;
   }
-  .col-4 {
+  .col-md-4 {
     width: 33.33333333%;
   }
-  .col-3 {
+  .col-md-3 {
     width: 25%;
   }
-  .col-2 {
+  .col-md-2 {
     width: 16.66666667%;
   }
-  .col-1 {
+  .col-md-1 {
     width: 8.33333333%;
   }
 }
-@media screen and (min-width: 481px) and (max-width: 840px) {
-  .columns {
+@media screen and (min-width: 841px) {
+  .form-horizontal {
+    padding: 1rem;
+  }
+  .form-horizontal .form-group {
     display:         flex;
     display: -ms-flexbox;
     display: -webkit-flex;
-    -webkit-flex-wrap: wrap;
-        -ms-flex-wrap: wrap;
-            flex-wrap: wrap;
   }
-  .col-12 {
-    width: 100%;
+  .form-horizontal .form-label {
+    margin-bottom: 0;
+    padding: .8rem .4rem;
   }
-  .col-11,
-  .col-10,
-  .col-9,
-  .col-8,
-  .col-7,
-  .col-6,
-  .col-5,
-  .col-4,
-  .col-3,
-  .col-2,
-  .col-1 {
-    width: 50%;
+  .form-horizontal .form-checkbox,
+  .form-horizontal .form-radio {
+    margin: .5rem 0;
+  }
+}
+@media screen and (max-width: 480px) {
+  .columns {
+    display: block;
+  }
+  .columns .column {
+    width: 100%;
   }
 }
 @media screen and (max-width: 480px) {
@@ -868,39 +1028,6 @@ pre code {
 .form-group:not(:last-child) {
   margin-bottom: 1rem;
 }
-@media screen and (min-width: 841px) {
-  .form-horizontal {
-    padding: 1rem;
-  }
-  .form-horizontal .form-group {
-    display:         flex;
-    display: -ms-flexbox;
-    display: -webkit-flex;
-  }
-  .form-horizontal .form-label {
-    padding: .8rem .4rem;
-  }
-  .form-horizontal .form-checkbox,
-  .form-horizontal .form-radio {
-    margin: .5rem 0;
-  }
-}
-@media screen and (max-width: 840px) {
-  .form-horizontal .col-12,
-  .form-horizontal .col-11,
-  .form-horizontal .col-10,
-  .form-horizontal .col-9,
-  .form-horizontal .col-8,
-  .form-horizontal .col-7,
-  .form-horizontal .col-6,
-  .form-horizontal .col-5,
-  .form-horizontal .col-4,
-  .form-horizontal .col-3,
-  .form-horizontal .col-2,
-  .form-horizontal .col-1 {
-    width: 100%;
-  }
-}
 .form-input {
   -webkit-appearance: none;
   background-color: #fff;
@@ -1082,19 +1209,19 @@ textarea.form-input {
   border-radius: .8rem;
   content: "";
   display: block;
-  height: 1.4rem;
-  left: .1rem;
+  height: 1.6rem;
+  left: 0;
   position: absolute;
-  top: .1rem;
+  top: 0;
   transition: left .15s ease;
-  width: 1.4rem;
+  width: 1.6rem;
 }
 .form-switch input:checked + .form-icon {
   background-color: #5764c6;
   border-color: #5764c6;
 }
 .form-switch input:checked + .form-icon::after {
-  left: 1.3rem;
+  left: 1.2rem;
 }
 .input-group {
   display:         flex;
@@ -1773,8 +1900,7 @@ textarea.form-input {
           transform: translate(-.5rem, 50%);
 }
 .clearfix::after,
-.container::after,
-.columns::after {
+.container::after {
   clear: both;
   content: "";
   display: table;
diff --git a/dist/spectre.min.css b/dist/spectre.min.css
index 0429764..466c931 100644
--- a/dist/spectre.min.css
+++ b/dist/spectre.min.css
@@ -1 +1 @@
-a,abbr[title]{text-decoration:underline}.label-base,progress,sub,sup{vertical-align:baseline}button,hr,input,select{overflow:visible}html,legend{box-sizing:border-box}pre,textarea{overflow:auto}blockquote p:last-child,pre code{margin-bottom:0}.btn,.menu .menu-item{-webkit-user-select:none;-moz-user-select:none}.btn-group .btn:focus,.btn-group .btn:hover,.input-group .form-input:focus,.input-group .input-group-addon:focus,.input-group .input-group-btn:focus{z-index:99}.label-base{border-radius:.2rem;display:inline;font-size:1em;padding:.1em .3em}/*! normalize.css v4.0.0 | MIT License | github.com/necolas/normalize.css */html{font-family:sans-serif;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}article,aside,details,figcaption,figure,footer,header,main,menu,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block}audio:not([controls]){display:none;height:0}[hidden],template{display:none}a{background-color:transparent;color:#5764c6}a:active,a:hover{outline-width:0}abbr[title]{border-bottom:none;text-decoration:underline dotted}.breadcrumb .breadcrumb-item a,.btn,.chip-sm,.menu .menu-item,.menu .menu-item a,.tab .tab-item a{text-decoration:none}b,strong{font-weight:bolder}dfn{font-style:italic}h1{margin:.67em 0}mark{color:#000}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}svg:not(:root){overflow:hidden}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}figure{margin:1em 40px}hr{box-sizing:content-box;height:0}button,input,select,textarea{font:inherit;margin:0}optgroup{font-weight:700}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{cursor:pointer}[disabled]{cursor:default}[type=reset],[type=submit],button,html [type=button]{-webkit-appearance:button}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}button:-moz-focusring,input:-moz-focusring{outline:ButtonText dotted 1px}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}legend{color:inherit;display:table;max-width:100%;padding:0;white-space:normal}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield}[type=search]::-webkit-search-cancel-button,[type=search]::-webkit-search-decoration{-webkit-appearance:none}*,::after,::before{box-sizing:inherit}html{font-size:10px;line-height:1.428571429;-webkit-tap-highlight-color:transparent}body{margin:0;background-color:#fff;color:#333;font-family:"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Hiragino Kaku Gothic Pro",Meiryo,"Malgun Gothic",sans-serif;font-size:1.4rem}a:focus,a:hover{color:#283176}.disabled,[disabled]{cursor:default;opacity:.5;pointer-events:none}.btn,.form-switch,.hand{cursor:pointer}.btn .icon,.menu .icon,.toast .icon{font-size:1.3333em;line-height:.8em;margin-right:.2rem;vertical-align:-20%}pre,pre code{line-height:1.8rem}h1,h2,h3,h4,h5,h6{color:inherit;font-weight:300;line-height:1.1;margin-bottom:1.5rem;margin-top:2.5rem}h1{font-size:5rem}h2{font-size:4rem}h3{font-size:3rem}h4{font-size:2.4rem}h5{font-size:2rem}h6{font-size:1.6rem}p{margin:0 0 1rem}blockquote{border-left:.2rem solid #ddd;margin-left:0;padding:1rem 2rem}blockquote cite{color:#b3b3b3}ol,ul{margin:2rem 0 2rem 2rem;padding:0}ol ol,ol ul,ul ol,ul ul{margin:1.5rem 0 1.5rem 2rem}ol li,ul li{margin-top:1rem}ul{list-style:disc inside}ul ul{list-style-type:circle}ol{list-style:decimal inside}ol ol{list-style-type:lower-alpha}.lead{font-size:120%}.highlight,code,mark{border-radius:.2rem;display:inline;font-size:1em;padding:.1em .3em;vertical-align:baseline}.highlight,mark{background-color:#ffe5a3}pre{background-color:#f9f9f9;border-left:.2rem solid #5764c6;margin-bottom:1em;margin-top:1em;padding:1.5rem}code{background-color:#efefef;white-space:nowrap}pre code{background-color:transparent;border-left:0;margin-top:0}.btn,.form-input{line-height:1.6rem;-webkit-appearance:none;outline:0}.container{margin-left:auto;margin-right:auto;overflow-x:hidden;padding-left:1rem;padding-right:1rem;width:100%}@media screen and (min-width:981px){.grid-960{margin-left:auto;margin-right:auto;width:96rem}}@media screen and (min-width:481px){.grid-480{margin-left:auto;margin-right:auto;width:48rem}}.columns{display:block;margin-left:-1rem;margin-right:-1rem}.column{-webkit-flex:1;-ms-flex:1;flex:1;padding:1rem}.column.col-1,.column.col-10,.column.col-11,.column.col-12,.column.col-2,.column.col-3,.column.col-4,.column.col-5,.column.col-6,.column.col-7,.column.col-8,.column.col-9{-webkit-flex:none;-ms-flex:none;flex:none}@media screen and (min-width:841px){.columns{display:flex;display:-ms-flexbox;display:-webkit-flex}.col-12{width:100%}.col-11{width:91.66666667%}.col-10{width:83.33333333%}.col-9{width:75%}.col-8{width:66.66666667%}.col-7{width:58.33333333%}.col-6{width:50%}.col-5{width:41.66666667%}.col-4{width:33.33333333%}.col-3{width:25%}.col-2{width:16.66666667%}.col-1{width:8.33333333%}}@media screen and (min-width:481px) and (max-width:840px){.columns{display:flex;display:-ms-flexbox;display:-webkit-flex;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap}.col-12{width:100%}.col-1,.col-10,.col-11,.col-2,.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9{width:50%}}@media screen and (max-width:480px){.hide-xs{display:none!important}}@media screen and (max-width:600px){.hide-sm{display:none!important}}@media screen and (max-width:840px){.hide-md{display:none!important}}@media screen and (max-width:960px){.hide-lg{display:none!important}}@media screen and (max-width:1280px){.hide-xl{display:none!important}}.img-responsive{display:block;height:auto;max-width:100%}.video-responsive{height:0;overflow:hidden;padding-bottom:56.25%;padding-top:3rem;position:relative}.video-responsive embed,.video-responsive iframe,.video-responsive object{height:100%;left:0;position:absolute;top:0;width:100%}.video-responsive video{height:auto;max-width:100%;width:100%}.video-responsive-4-3{padding-bottom:75%}.table{border-collapse:collapse;border-spacing:0;width:100%}.table td,.table th{border-bottom:.1rem solid #efefef;padding:1.5rem 1rem;text-align:left}.badge::after,.btn{text-align:center;white-space:nowrap}.table th{border-color:#c9c9c9}.table .selected{background-color:#f4f4f4}.btn{background-color:transparent;border:.1rem solid #5764c6;border-radius:.3rem;color:#5764c6;display:inline-block;font-size:1.4rem;height:3.2rem;padding:.7rem 1.5rem;-ms-user-select:none;user-select:none;vertical-align:middle}.btn:focus,.btn:hover{background-color:#5764c6;border-color:#4452c0;color:#fff}.btn.active,.btn:active{background-color:#4452c0;border-color:#3b49af;color:#fff}.btn.btn-primary{background-color:#5764c6;border-color:#4452c0;color:#fff}.btn.btn-primary:focus,.btn.btn-primary:hover{background-color:#4452c0;border-color:#3b49af;color:#fff}.btn.btn-primary.active,.btn.btn-primary:active{background-color:#3b49af;border-color:#35419c;color:#fff}.btn.btn-clear,.btn.btn-link{background-color:transparent}.btn.btn-primary.loading::after{border-color:transparent transparent #fff #fff}.btn.btn-link{border-color:transparent;color:#5764c6}.btn.btn-link:focus,.btn.btn-link:hover{color:#35419c}.btn.btn-link.active,.btn.btn-link:active{color:#283176}.btn.btn-sm{border-radius:.2rem;font-size:1.2rem;height:2.4rem;line-height:1.4rem;padding:.4rem 1rem}.btn.btn-lg{border-radius:.4rem;font-size:1.8rem;height:4.2rem;line-height:2rem;padding:1rem 1.8rem}.btn.btn-block{display:block;width:100%}.btn.btn-clear{border:0;border-radius:.7rem;height:1.4rem;margin:.1rem -.2rem .1rem .2rem;opacity:.35;padding:0;position:relative;vertical-align:top;width:1.4rem}.btn.btn-clear:hover{opacity:.75}.btn.btn-clear::after,.btn.btn-clear::before{background-color:#333;content:"";display:block;left:50%;position:absolute;top:50%;-webkit-transform:rotate(-45deg);transform:rotate(-45deg)}.btn.btn-clear::before{height:.2rem;margin-left:-.5rem;margin-top:-.1rem;width:1rem}.btn.btn-clear::after{height:1rem;margin-left:-.1rem;margin-top:-.5rem;width:.2rem}.btn-group{display:inline-flex;display:-ms-inline-flexbox;display:-webkit-inline-flex;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap}.btn-group .btn{-webkit-flex:1 0 auto;-ms-flex:1 0 auto;flex:1 0 auto}.btn-group .btn:first-child:not(:last-child){border-bottom-right-radius:0;border-top-right-radius:0}.btn-group .btn:not(:first-child):not(:last-child){border-radius:0;margin-left:-.1rem}.btn-group .btn:last-child:not(:first-child){border-bottom-left-radius:0;border-top-left-radius:0;margin-left:-.1rem}.btn-group.btn-group-block{display:flex;display:-ms-flexbox;display:-webkit-flex}.form-group:not(:last-child){margin-bottom:1rem}@media screen and (min-width:841px){.form-horizontal{padding:1rem}.form-horizontal .form-group{display:flex;display:-ms-flexbox;display:-webkit-flex}.form-horizontal .form-label{padding:.8rem .4rem}.form-horizontal .form-checkbox,.form-horizontal .form-radio{margin:.5rem 0}}@media screen and (max-width:840px){.form-horizontal .col-1,.form-horizontal .col-10,.form-horizontal .col-11,.form-horizontal .col-12,.form-horizontal .col-2,.form-horizontal .col-3,.form-horizontal .col-4,.form-horizontal .col-5,.form-horizontal .col-6,.form-horizontal .col-7,.form-horizontal .col-8,.form-horizontal .col-9{width:100%}}.form-input{background-color:#fff;background-image:none;border:.1rem solid #c5c5c5;border-radius:.3rem;color:#333;display:block;font-size:1.4rem;height:3.2rem;max-width:100%;padding:.7rem .8rem;position:relative;width:100%}.form-input:focus{border-color:#5764c6}.form-input[disabled]{background-color:#eeeff2}.form-input.input-sm{border-radius:.2rem;font-size:1.2rem;height:2.4rem;padding:.3rem .6rem}.form-input.input-lg{border-radius:.4rem;font-size:1.6rem;height:4.2rem;line-height:2rem;padding:1rem 1.2rem}.form-input.input-inline{display:inline-block;width:auto}textarea.form-input{height:auto;line-height:2rem}.form-input.is-success,.has-success .form-input{border-color:#32b643}.form-input.is-danger,.has-danger 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a;text-shadow:none}.text-right{text-align:right}.text-center{text-align:center}.text-justify{text-align:justify}.text-lowercase{text-transform:lowercase}.text-uppercase{text-transform:uppercase}.text-capitalize{text-transform:capitalize}.text-normal{font-weight:400}.text-bold{font-weight:700}.text-italic{font-style:italic}.text-ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.text-clip{overflow:hidden;text-overflow:clip;white-space:nowrap}.text-break{-webkit-hyphens:auto;-ms-hyphens:auto;hyphens:auto;word-break:break-word;word-wrap:break-word}.shadow{box-shadow:0 .1rem .4rem rgba(0,0,0,.3)}.light-shadow{box-shadow:0 .1rem .2rem rgba(0,0,0,.15)}.rounded{border-radius:.3rem}.circle{border-radius:50%}.divider{border-bottom:.1rem solid #efefef;display:block;margin:.5rem}.loading{color:transparent!important;min-height:1.6rem;pointer-events:none;position:relative}.loading::after{-webkit-animation:loading .5s infinite linear;animation:loading .5s infinite linear;border:.2rem solid #5764c6;border-radius:.8rem;border-right-color:transparent;border-top-color:transparent;content:"";display:block;height:1.6rem;left:50%;margin-left:-.8rem;margin-top:-.8rem;position:absolute;top:50%;width:1.6rem}
\ No newline at end of file
diff --git a/index.html b/index.html
index cec8020..2b0ef28 100644
--- a/index.html
+++ b/index.html
@@ -299,20 +299,7 @@
                     <div class="bg-grey"></div>
                 </div>
             </div>
-            <div class="columns">
-                <div class="column col-6">
-                    <div class="bg-grey">col-6</div>
-                </div>
-                <div class="column col-3">
-                    <div class="bg-grey">col-3</div>
-                </div>
-                <div class="column col-2">
-                    <div class="bg-grey">col-2</div>
-                </div>
-                <div class="column col-1">
-                    <div class="bg-grey">col-1</div>
-                </div>
-            </div>
+
             <div class="columns">
                 <div class="column col-12">
                     <div class="bg-grey">col-12 (100%)</div>
@@ -333,12 +320,10 @@
                     <div class="bg-grey">col-3 (25%)</div>
                 </div>
             </div>
+
             <section class="notes">
                 <p>Add the class <code>columns</code> to a container. And add any element you want with classname <code>column</code> inside the container. These columns will take up the space equally. You can specific the width of each column by adding class <code>col-[1-12]</code>.</p>
             </section>
-            <section class="notes">
-                <p>When the width of browser viewport is less than 840px and more than 480px, the col-[1-11] will be 50% width to the parent elements.</p>
-            </section>
 
             <!-- layout example -->
 <pre class="code lang-html">
@@ -350,6 +335,61 @@
 &lt;<span class="tag">/div</span>&gt;
 </pre>
 
+            <div class="columns">
+                <div class="column col-md-6">
+                    <div class="bg-grey">col-md-6</div>
+                </div>
+                <div class="column col-md-3">
+                    <div class="bg-grey">col-md-3</div>
+                </div>
+                <div class="column col-md-3">
+                    <div class="bg-grey">col-md-3</div>
+                </div>
+            </div>
+
+            <div class="columns">
+                <div class="column col-sm-6">
+                    <div class="bg-grey">col-sm-6</div>
+                </div>
+                <div class="column col-sm-3">
+                    <div class="bg-grey">col-sm-3</div>
+                </div>
+                <div class="column col-sm-3">
+                    <div class="bg-grey">col-sm-3</div>
+                </div>
+            </div>
+
+            <div class="columns">
+                <div class="column col-xs-6">
+                    <div class="bg-grey">col-xs-6</div>
+                </div>
+                <div class="column col-xs-3">
+                    <div class="bg-grey">col-xs-3</div>
+                </div>
+                <div class="column col-xs-3">
+                    <div class="bg-grey">col-xs-3</div>
+                </div>
+            </div>
+
+            <section class="notes">
+                <p>Spectre also provides a neat responsive layout grid system. There are <code>.col-xs-[1-12]</code>, <code>.col-sm-[1-12]</code> and <code>.col-md-[1-12]</code> available for flexible grid across mobile, tablet and desktop viewport usage.</p>
+                <ul>
+                    <li>For window width less than <strong>480px</strong>, all columns will show as a single row.</li>
+                    <li><code>col-xs-[1-12]</code> apply to window width greater than or equal to <strong>481px</strong>. </li>
+                    <li><code>col-sm-[1-12]</code> apply to window width greater than or equal to <strong>601px</strong>. </li>
+                    <li><code>col-md-[1-12]</code> apply to window width greater than or equal to <strong>841px</strong>. </li>
+                </ul>
+            </section>
+
+            <!-- layout example -->
+<pre class="code lang-html">
+&lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;columns&quot;</span>&gt;
+    &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;column col-xs-6&quot;</span>&gt;col-xs-6&lt;<span class="tag">/div</span>&gt;
+    &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;column col-xs-3&quot;</span>&gt;col-xs-3&lt;<span class="tag">/div</span>&gt;
+    &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;column col-xs-3&quot;</span>&gt;col-xs-3&lt;<span class="tag">/div</span>&gt;
+&lt;<span class="tag">/div</span>&gt;
+</pre>
+
         </section>
 
         <section id="tables" class="grid-960">
@@ -597,20 +637,26 @@
                 <div class="column col-6">
                     <form class="form-horizontal" action="#forms">
                         <div class="form-group">
-                            <label class="form-label col-3" for="input-example-4">Name</label>
-                            <div class="col-9">
+                            <div class="col-sm-3">
+                                <label class="form-label" for="input-example-4">Name</label>
+                            </div>
+                            <div class="col-sm-9">
                                 <input class="form-input" type="text" id="input-example-4" placeholder="Name" />
                             </div>
                         </div>
                         <div class="form-group">
-                            <label class="form-label col-3" for="input-example-5">Email</label>
-                            <div class="col-9">
+                            <div class="col-sm-3">
+                                <label class="form-label" for="input-example-5">Email</label>
+                            </div>
+                            <div class="col-sm-9">
                                 <input class="form-input" type="email" id="input-example-5" placeholder="Email" />
                             </div>
                         </div>
                         <div class="form-group">
-                            <label class="form-label col-3">Gender</label>
-                            <div class="col-9">
+                            <div class="col-sm-3">
+                                <label class="form-label">Gender</label>
+                            </div>
+                            <div class="col-sm-9">
                                 <label class="form-radio">
                                     <input type="radio" name="gender" />
                                     <i class="form-icon"></i> Male
@@ -622,8 +668,8 @@
                             </div>
                         </div>
                         <div class="form-group">
-                            <div class="col-3"></div>
-                            <div class="col-9">
+                            <div class="col-sm-3"></div>
+                            <div class="col-sm-9">
                                 <select class="form-select">
                                     <option>Choose an option</option>
                                     <option>Slack</option>
@@ -633,8 +679,8 @@
                             </div>
                         </div>
                         <div class="form-group">
-                            <div class="col-3"></div>
-                            <div class="col-9">
+                            <div class="col-sm-3"></div>
+                            <div class="col-sm-9">
                                 <label class="form-switch">
                                     <input type="checkbox" />
                                     <i class="form-icon"></i> Send me emails with news and tips
@@ -642,14 +688,16 @@
                             </div>
                         </div>
                         <div class="form-group">
-                            <label class="form-label col-3" for="input-example-6">Message</label>
-                            <div class="col-9">
+                            <div class="col-sm-3">
+                                <label class="form-label" for="input-example-6">Message</label>
+                            </div>
+                            <div class="col-sm-9">
                                 <textarea class="form-input" id="input-example-6" placeholder="Textarea" rows="3"></textarea>
                             </div>
                         </div>
                         <div class="form-group">
-                            <div class="col-3"></div>
-                            <div class="col-9">
+                            <div class="col-sm-3"></div>
+                            <div class="col-sm-9">
                                 <label class="form-checkbox">
                                     <input type="checkbox" />
                                     <i class="form-icon"></i> Remember me
@@ -657,8 +705,8 @@
                             </div>
                         </div>
                         <div class="form-group">
-                            <div class="col-3"></div>
-                            <div class="col-9">
+                            <div class="col-sm-3"></div>
+                            <div class="col-sm-9">
                                 <button class="btn btn-primary" type="submit">Submit</button>
                                 <button class="btn btn-link" type="reset">Cancel</button>
                             </div>
@@ -726,8 +774,10 @@
 <pre class="code lang-html">
 &lt;<span class="tag">form</span> <span class="atn">class</span>=<span class="atv">&quot;form-horizontal&quot;</span>&gt;
     &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;form-group&quot;</span>&gt;
-        &lt;<span class="tag">label</span> <span class="atn">class</span>=<span class="atv">&quot;form-label col-3&quot;</span> <span class="atn">for</span>=<span class="atv">&quot;input-example-1&quot;</span>&gt;Name&lt;<span class="tag">/label</span>&gt;
-        &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;col-9&quot;</span>&gt;
+        &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;col-sm-3&quot;</span>&gt;
+            &lt;<span class="tag">label</span> <span class="atn">class</span>=<span class="atv">&quot;form-label&quot;</span> <span class="atn">for</span>=<span class="atv">&quot;input-example-1&quot;</span>&gt;Name&lt;<span class="tag">/label</span>&gt;
+        &lt;<span class="tag">/div</span>&gt;
+        &lt;<span class="tag">div</span> <span class="atn">class</span>=<span class="atv">&quot;col-sm-9&quot;</span>&gt;
             &lt;<span class="tag">input</span> <span class="atn">class</span>=<span class="atv">&quot;form-input&quot;</span> <span class="atn">type</span>=<span class="atv">&quot;text&quot;</span> <span class="atn">id</span>=<span class="atv">&quot;input-example-1&quot;</span> <span class="atn">placeholder</span>=<span class="atv">&quot;Name&quot;</span> /&gt;
         &lt;<span class="tag">/div</span>&gt;
     &lt;<span class="tag">/div</span>&gt;
diff --git a/package.json b/package.json
index d528c5a..05c4d22 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "spectre.css",
-  "version": "0.1.12",
+  "version": "0.1.13",
   "homepage": "http://picturepan2.github.io/spectre",
   "author": "Yan Zhu <picturepan2@hotmail.com>",
   "description": "Spectre.css: a lightweight, responsive and modern CSS framework.",
diff --git a/src/forms.less b/src/forms.less
index a01ab3c..9f8b952 100644
--- a/src/forms.less
+++ b/src/forms.less
@@ -2,41 +2,6 @@
 .form-group:not(:last-child) {
   margin-bottom: 1rem;
 }
-
-@media screen and (min-width: 841px) {
-  .form-horizontal {
-    padding: 1rem;
-
-    .form-group {
-      display: flex;
-    }
-    .form-label {
-      padding: .8rem .4rem;
-    }
-    .form-checkbox,
-    .form-radio {
-      margin: .5rem 0;
-    }
-  }
-}
-@media screen and (max-width: 840px) {
-  .form-horizontal {
-    .col-12,
-    .col-11,
-    .col-10,
-    .col-9,
-    .col-8,
-    .col-7,
-    .col-6,
-    .col-5,
-    .col-4,
-    .col-3,
-    .col-2,
-    .col-1 {
-      width: 100%;
-    }
-  }
-}
 // Form element: Input boxes
 .form-input {
   position: relative;
@@ -243,12 +208,12 @@
     &::after {
       content: "";
       display: block;
-      width: 1.4rem;
-      height: 1.4rem;
+      width: 1.6rem;
+      height: 1.6rem;
       border-radius: .8rem;
       position: absolute;
-      top: .1rem;
-      left: .1rem;
+      top: 0;
+      left: 0;
       background-color: #fff;
       transition: left .15s ease;
     }
@@ -259,7 +224,7 @@
     border-color: @core-color;
 
     &::after {
-      left: 1.3rem;
+      left: 1.2rem;
     }
   }
 }
diff --git a/src/layout.less b/src/layout.less
index 1a4ed06..7be4c96 100644
--- a/src/layout.less
+++ b/src/layout.less
@@ -25,13 +25,13 @@
 
 // Responsive grid system
 .columns {
-  display: block;
+  display: flex;
+  flex-wrap: wrap;
   margin-left: -1rem;
   margin-right: -1rem;
-  &:extend(.clearfix all);
 }
 .column {
-  flex: 1;
+  flex: 1 0 auto;
   padding: 1rem;
 
   &.col-12,
@@ -49,92 +49,248 @@
     flex: none;
   }
 }
-@media screen and (min-width: 841px) {
-  .columns {
-    display: flex;
+.col-12 {
+  width: 100%;
+}
+.col-11 {
+  width: 91.66666667%;
+}
+.col-10 {
+  width: 83.33333333%;
+}
+.col-9 {
+  width: 75%;
+}
+.col-8 {
+  width: 66.66666667%;
+}
+.col-7 {
+  width: 58.33333333%;
+}
+.col-6 {
+  width: 50%;
+}
+.col-5 {
+  width: 41.66666667%;
+}
+.col-4 {
+  width: 33.33333333%;
+}
+.col-3 {
+  width: 25%;
+}
+.col-2 {
+  width: 16.66666667%;
+}
+.col-1 {
+  width: 8.33333333%;
+}
+@media screen and (min-width: (@size-xs+1px)) {
+  .col-xs-12,
+  .col-xs-11,
+  .col-xs-10,
+  .col-xs-9,
+  .col-xs-8,
+  .col-xs-7,
+  .col-xs-6,
+  .col-xs-5,
+  .col-xs-4,
+  .col-xs-3,
+  .col-xs-2,
+  .col-xs-1 {
+    flex: none;
   }
-  .col-12 {
+  .col-xs-12 {
     width: 100%;
   }
-  .col-11 {
+  .col-xs-11 {
     width: 91.66666667%;
   }
-  .col-10 {
+  .col-xs-10 {
     width: 83.33333333%;
   }
-  .col-9 {
+  .col-xs-9 {
     width: 75%;
   }
-  .col-8 {
+  .col-xs-8 {
     width: 66.66666667%;
   }
-  .col-7 {
+  .col-xs-7 {
     width: 58.33333333%;
   }
-  .col-6 {
+  .col-xs-6 {
     width: 50%;
   }
-  .col-5 {
+  .col-xs-5 {
     width: 41.66666667%;
   }
-  .col-4 {
+  .col-xs-4 {
     width: 33.33333333%;
   }
-  .col-3 {
+  .col-xs-3 {
     width: 25%;
   }
-  .col-2 {
+  .col-xs-2 {
     width: 16.66666667%;
   }
-  .col-1 {
+  .col-xs-1 {
     width: 8.33333333%;
   }
 }
-@media screen and (min-width: 481px) and (max-width: 840px) {
-  .columns {
-    display: flex;
-    flex-wrap: wrap;
+@media screen and (min-width: (@size-sm+1px)) {
+  .col-sm-12,
+  .col-sm-11,
+  .col-sm-10,
+  .col-sm-9,
+  .col-sm-8,
+  .col-sm-7,
+  .col-sm-6,
+  .col-sm-5,
+  .col-sm-4,
+  .col-sm-3,
+  .col-sm-2,
+  .col-sm-1 {
+    flex: none;
+  }
+  .col-sm-12 {
+    width: 100%;
+  }
+  .col-sm-11 {
+    width: 91.66666667%;
+  }
+  .col-sm-10 {
+    width: 83.33333333%;
+  }
+  .col-sm-9 {
+    width: 75%;
+  }
+  .col-sm-8 {
+    width: 66.66666667%;
+  }
+  .col-sm-7 {
+    width: 58.33333333%;
+  }
+  .col-sm-6 {
+    width: 50%;
+  }
+  .col-sm-5 {
+    width: 41.66666667%;
+  }
+  .col-sm-4 {
+    width: 33.33333333%;
   }
-  .col-12 {
+  .col-sm-3 {
+    width: 25%;
+  }
+  .col-sm-2 {
+    width: 16.66666667%;
+  }
+  .col-sm-1 {
+    width: 8.33333333%;
+  }
+}
+@media screen and (min-width: (@size-md+1px)) {
+  .col-md-12,
+  .col-md-11,
+  .col-md-10,
+  .col-md-9,
+  .col-md-8,
+  .col-md-7,
+  .col-md-6,
+  .col-md-5,
+  .col-md-4,
+  .col-md-3,
+  .col-md-2,
+  .col-md-1 {
+    flex: none;
+  }
+  .col-md-12 {
     width: 100%;
   }
-  .col-11,
-  .col-10,
-  .col-9,
-  .col-8,
-  .col-7,
-  .col-6,
-  .col-5,
-  .col-4,
-  .col-3,
-  .col-2,
-  .col-1 {
+  .col-md-11 {
+    width: 91.66666667%;
+  }
+  .col-md-10 {
+    width: 83.33333333%;
+  }
+  .col-md-9 {
+    width: 75%;
+  }
+  .col-md-8 {
+    width: 66.66666667%;
+  }
+  .col-md-7 {
+    width: 58.33333333%;
+  }
+  .col-md-6 {
     width: 50%;
   }
+  .col-md-5 {
+    width: 41.66666667%;
+  }
+  .col-md-4 {
+    width: 33.33333333%;
+  }
+  .col-md-3 {
+    width: 25%;
+  }
+  .col-md-2 {
+    width: 16.66666667%;
+  }
+  .col-md-1 {
+    width: 8.33333333%;
+  }
+}
+@media screen and (min-width: (@size-md+1px)) {
+  .form-horizontal {
+    padding: 1rem;
+
+    .form-group {
+      display: flex;
+    }
+    .form-label {
+      padding: .8rem .4rem;
+      margin-bottom: 0;
+    }
+    .form-checkbox,
+    .form-radio {
+      margin: .5rem 0;
+    }
+  }
+}
+@media screen and (max-width: @size-xs) {
+  .columns {
+    display: block;
+    &:extend(.clearfix all);
+
+    .column {
+      width: 100%;
+    }
+  }
 }
 
 // Responsive breakpoint system
-@media screen and (max-width: 480px) {
+@media screen and (max-width: @size-xs) {
   .hide-xs {
     display: none !important;
   }
 }
-@media screen and (max-width: 600px) {
+@media screen and (max-width: @size-sm) {
   .hide-sm {
     display: none !important;
   }
 }
-@media screen and (max-width: 840px) {
+@media screen and (max-width: @size-md) {
   .hide-md {
     display: none !important;
   }
 }
-@media screen and (max-width: 960px) {
+@media screen and (max-width: @size-lg) {
   .hide-lg {
     display: none !important;
   }
 }
-@media screen and (max-width: 1280px) {
+@media screen and (max-width: @size-xl) {
   .hide-xl {
     display: none !important;
   }
diff --git a/src/variables.less b/src/variables.less
index 404cd1f..6a5c260 100644
--- a/src/variables.less
+++ b/src/variables.less
@@ -17,6 +17,13 @@
 @control-color-warning: #ffb700;
 @control-color-danger: #e85600;
 
+// Responsive Breakpoints
+@size-xs: 480px;
+@size-sm: 600px;
+@size-md: 840px;
+@size-lg: 960px;
+@size-xl: 1280px;
+
 // Mixins
 .clearfix() {
   &::after {