app/assets/stylesheets/main.css.scss

Summary

Maintainability
Test Coverage
$dark: #0063A5;
$light: #0090D2;
$error: #E42020;
$success: #37A359;

@mixin break-after {
  &:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
  }
}

@mixin border-box {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
}

@mixin gradient-top($from, $to) {
  background: $from;
  background: -moz-linear-gradient(top,  $from 0%, $to 30%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,$from), color-stop(30%,$to));
  background: -webkit-linear-gradient(top,  $from 0%,$to 30%);
  background: -o-linear-gradient(top,  $from 0%,$to 30%);
  background: -ms-linear-gradient(top,  $from 0%,$to 30%);
  background: linear-gradient(to bottom,  $from 0%,$to 30%);
}

body {
  font-family: 'Cabin', sans-serif;
  text-rendering: optimizelegibility;
  margin: 0;
}

body > div:not([class]), .box {
  // no op that allows content inside to be placed relatively to the
  // container
  position: relative;
  top: 0;
  left: 0;

  margin: 20px auto;
  border: 1px solid #888;
  box-shadow: 0 0 10px rgba(40, 40, 40, 0.4);
  background: #fff;
  padding: 20px;
  width: 90%;
  max-width: 1400px;
  @include border-box;

  & h2:first-child, h3:first-child {
    margin-top: 0;
  }

  &.wrong {
    @include gradient-top(#FFE4E3, #fff);
  }

  &.correct {
    @include gradient-top(#E6FFE9, #fff);
  }
}

#header {
  background: $dark;
  /* undo body > div rules. Thanks Internet Explorer! */
  box-shadow: none;
  margin: 0;
  max-width: 100%;
  padding: 0;
  position: static;
  width: 100%;
  height: 122px;
}

#header + div, noscript + div, noscript div {
  margin-top: 0 !important;
  border-top: 0 !important;
}


h1 {
  color: #fff;
  font-family: 'Yanone Kaffeesatz', sans-serif;
  font-size: 45px;
  text-shadow: 1px 1px 1px #000;
  padding: 10px 20px;
  margin: 0px auto;
  width: 90%;
  max-width: 1400px;
  height: 72px;
  overflow: hidden;
  white-space: nowrap;
  @include border-box;
}

#nav {
  padding: 5px 15px;
  background: $light;
  box-shadow: 0 0 10px rgba(40, 40, 40, 0.4);
  border: 1px solid #004A6B;
  border-bottom: 0;

  font-family: 'Yanone Kaffeesatz', sans-serif;
  color: #fff;
  text-shadow: 1px 1px rgba(55, 55, 55, 0.7);
  font-size: 23px;

  margin: 0px auto;
  width: 90%;
  max-width: 1400px;
  @include border-box;

  a, span {
    color: inherit;
    display: inline-block;
    padding: 5px;
    font-weight: bold;
  }

  > span {
    font-weight: normal;
  }

  > span, > a {
    float: right;
  }

  ul {
    list-style-type: none;
    display: inline-block;
    margin: 0;
    padding: 0;

    li {
      display: inline-block;
    }
  }
}

a {
  text-decoration: none;
  color: #0090D2;
  cursor: pointer;

  &:hover {
    text-decoration: underline;
  }
}

td {
  vertical-align: top;

  a + a {
    margin-left: 10px;
  }
}

h2 {
  margin: 10px 0;
}

h2, h3, h4, h5 {
  small {
    color: #888;
  }
}

.chooser {
  margin: 0;
  padding: 0;
  list-style-type: none;

  li {
    margin: 5px 0;
  }

  a.button {
    width: 120px;
    margin-right: 5px;
  }
}

.inline-chooser {
  margin: 0;
  padding: 0;
  list-style-type: none;

  ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
    display: table;

    li {
      padding-bottom: 15px;
      display: table-row;
    }

    li > div {
      display: table-cell;
      vertical-align: middle;

      > .button {
        width: 100%;
        @include border-box;
      }
    }

    li > .tex {
      padding-left: 10px;

      padding-top: 10px;
      padding-bottom: 10px;
    }
  }
}

p {
  &.left {
    display: table-cell;
    padding-right: 5px;
  }

  &.right {
    display: table-cell;
    margin: 0;
  }
}

form {
  clear: both;
  @include break-after;
  line-height: 30px;
}

label {
  width: 122px;
  font-weight: bold;
  float: left;
  clear: left;
  cursor: pointer;
  margin: 5px 0;
}

.field_with_errors label {
  color: $error;
}

input + span, select + span, textarea + span,  .field_with_errors + span {
  float: left;
  display: block;
  margin-left: 8px;
  color: #777;
  line-height: 23px;
  padding-top: 4px;
}

input[type=checkbox] + span {
  margin-top: -1px;
}

input[type="checkbox"] {
  margin-top: 8px;
}

input, textarea {
  @include border-box;
  float: left;
  display: block;
  min-width: 320px;
  padding: 4px;
  margin: 4px 0;
  border: 1px solid #aaa;
  background: #fff;
  color: #000;

  &:focus {
    border-color: $dark !important;
    box-shadow: 0 0 2px $light;
    outline: none;
  }

  &[disabled] {
    color: #666;
    font-style: italic;
  }

  &[type=submit] {
    clear: both;
    margin: 8px 0;
    min-width: 0;
  }
}

.field_with_errors input {
  border-color: #B01E1E;
}

textarea {
  min-width: 600px;
  height: 150px;
}

select {
  @include border-box;
  float: left;
  min-width: 320px;
  margin: 4px 0;
  padding-left: 4px;
  padding-top: 3px;
  border: 1px solid #aaa;
  background: #fff;

  &:focus {
    border-color: $dark !important;
    box-shadow: 0 0 2px $light;
    outline: none;
  }

  option {
    background: #fff;
    color: #000;
    line-height: 30px;
    padding-bottom: 4px;
    padding-left: 4px;
  }
}

.smallform {
  input, textarea, select {
    min-width: 100px;
    width: 100px;
  }
}

.error {
  ul {
    margin-top: 0;
    padding-left: 16px;
  }
}


.flash {
  ul {
    margin: 0;
  }
}

.alert-error, td .wrong {
  color: $error;
}

.alert-success, td .correct {
  color: $success;
}

table {
  margin-top: 20px;

  &.spaced {
    th, td {
      padding: 2px 10px;
    }
  }

  &.evenodd tr:nth-child(even) {
    background: #f7f7f7;
  }
}

th {
  text-align: left;
  vertical-align: top;
}

img {
  vertical-align: middle;
}

img.latex-block {
  display: block;
  margin: 5px 0;
}

.tex {
  font-size: 17px;
  line-height: 19px;

  img {
    vertical-align: text-bottom;
  }
}

.clear, #preview, #preview > div {
  clear: both;

  &:after {
    content: "";
    display: block;
    clear: both;
  }
}

#preview {
  border-top: 1px solid #AAAAAA;
  border-bottom: 1px solid #AAAAAA;
  margin-left: 100px;
}

.toggle {
    width:100% !important;
    min-width:100% !important;
}

.toggle-head {
  cursor: pointer;
  &:after {
    color: #777;
    padding-left: 10px;
  }
}

.toggle-closed {
  &:after {
    content: "▾";
  }
}

.toggle-opened {
  &:after {
    content: "▴";
  }
}

body {
  counter-reset: count;
}

.count:after {
  counter-increment: count;
  content: " " counter(count);
}

.strike {
  text-decoration: line-through;
}

.star, .topright {
  position: absolute;
  top: 20px;
  right: 20px;
}

.dotimg {
  max-width: 100%;
}

hr {
  color: #ddd;
  background-color: #ddd;
  height: 1px;
  border: 0;
}

.okay-state {
  width: 50px;
  height: 50px;
  margin-right: 10px;
  margin-bottom: 10px;
  float:left;
  line-height: 50px;
  vertical-align: top;
  font-size: 50px;
  text-align: center;
}

.traceToRootLine {
  color: #777;
  margin-bottom: 20px;
  display: block;
}

.traceToRootSplitter {
  border-left: 1px solid #ccc;
  margin-left: 5px;
  padding-left: 5px;
  display: inline-block;
  vertical-align: top;
}

.columnize {
  -moz-columns: auto 18em;
  -webkit-columns: auto 18em;
  columns: auto 18em;

  a {
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    width: 18em;
    display: inline-block;
  }

  b {
    display: inline-block;
    width: 18em;
  }
}

.alternating.even {
  background: #efefef;
  margin: 20px -20px;
  padding: 20px;
}