/* General styles */

hr {
  width: 80%;
  margin: 50px auto;
}

/* Element selectors example */

#element-selectors h1 {
  color: red;
  text-shadow: 1px 1px 1px black;
  background: linear-gradient(to bottom, rgba(0,0,0,0.25), rgba(0,0,0,0.1));
  padding: 3px;
  text-align: center;
  box-shadow: inset 2px 2px 5px rgba(0,0,0,0.5), inset -2px -2px 5px rgba(255,255,255,0.5);
}

/* Class selectors example */

#class-selectors .base-box {
  background-image: linear-gradient(to bottom, rgba(0,0,0,0.1), rgba(0,0,0,0.3));
  padding: 3px 3px 3px 7px;
}

#class-selectors .important {
  font-weight: bold;
}

#class-selectors .editor-note {
  background-color: #9999ff;
  border-left: 6px solid #333399;
}

#class-selectors .warning {
  background-color: #ff9999;
  border-left: 6px solid #993333;
}

/* ID selectors example */

#id-selectors p {
  text-transform: uppercase;
  padding: 5px;
}

#id-selectors #first {
  background-color: goldenrod;
}

#id-selectors #second {
  background-color: silver;
}

#id-selectors #third {
  background-color: #CD7F32;
}

/* Attribute selectors */

#attribute-selectors li[lang="en-GB"] {
  background: url("en-GB.png") 5px center no-repeat;
}

#attribute-selectors li[lang="de"] {
  background: url("de.png") 5px center no-repeat;
}

#attribute-selectors li[lang="es"] {
  background: url("es.png") 5px center no-repeat;
}

#attribute-selectors li[data-perf*="inc"] {
  background-color: rgba(0,255,0,0.7);
}

#attribute-selectors li[data-perf*="same"] {
  background-color: rgba(0,0,255,0.5);
}

#attribute-selectors li[data-perf*="dec"] {
  background-color: rgba(255,0,0,0.7);
}

#attribute-selectors li[data-perf*="pro"] {
  font-weight: bold;
}

#attribute-selectors li[data-perf*="rel"] {
  font-style: italic;
  color: #666;
}

#attribute-selectors ol {
  padding: 0;
}

#attribute-selectors li {
  padding: 3px 3px 3px 34px;
  margin-bottom: 5px;
  list-style-position: inside;
}

/* Pseudo class selectors */

#pseudo-class-selectors ul {
  padding: 0;
}

#pseudo-class-selectors li {
  padding: 3px;
  margin-bottom: 5px;
  list-style-type: none;
}

#pseudo-class-selectors a {
  text-decoration: none;
  color: black;
}

#pseudo-class-selectors a:hover {
  text-decoration: underline;
  color: red;
}

#pseudo-class-selectors li:nth-of-type(2n) {
  background-color: #ccc;
}

#pseudo-class-selectors li:nth-of-type(2n+1) {
  background-color: #eee;
}

/* Pseudo element selectors */

#pseudo-element-selectors p::first-line {
  text-transform: uppercase;
}

#pseudo-element-selectors p::first-letter {
  font-size: 3em;
  border: 1px solid black;
  background: red;
  display: block;
  float: left;
  padding: 2px;
  margin-right: 4px;
}

/* Combinators */

#combinators ul {
  padding: 0;
  list-style-type: none;
}

#combinators ul a {
  text-decoration: none;
  display: inline-block;
  color: black;
  background-color: red;
  padding: 5px;
  margin-bottom: 10px;
}

#combinators ul a:hover {
  color: red;
  background-color: black;
}

h1 + p {
  font-weight: bold;
  color: blue;
}