# SCSS / SASS

https://sass-lang.com/ (opens new window)

guide (opens new window)

Extension to CSS
preprocessor
CSS gets messy
also LASS, Stylus…

# Features

you get

Variables
Nesting
operators
partials & imports
mixins, functions
extends
control directives

# 2 different syntaxes

# SCSS

uses CSS style

# SASS

indentation, no curly braces

experiment in codepen

# Comments

// comment
/* comment */

# Variables `$`

$color-primary: #f9ed69; // yellow color

nav {
  margin: 30px;
  background-color: $color-primary
}

# Nested Selectors

this

.navigation {
  list-style: none;
  
  li {
    
  }
}

is the same as

navigation li {
  
}

you can nest inside a nested selector: (use &)

.navigation {
  list-style: none;
  
  li {
    display: inline-block;
    margin-left: 30px;
    
    &:first-child {
      margin: 0;
    }
  }
}

# path `&`

&is the selector path at this point - attaches directly

 .navigation li:first-child
// without &:
.navigation li: first-child // doesn't work

don't nest to deeply...

.navigation {
  list-style: none;
  
  li {
    display: inline-block;
    margin-left: 30px;
    
    &:first-child {
      margin: 0;
    }
    
    a:link {
      text-decoration: none;
      text-transform: uppercase;
      color: $color-text-dark;
    }
  }
}

# Example: clearfix

if all elements float, the parent-element gets a size of 0
.clearfix::after {
content: "";
clear: both;
display: table;
}

instead of using a clearfix-class, you can nest it in the element

nav {
  margin: 30px;
  background-color: $color-primary
    
  &::after {
    content: "";
    clear: both;
    display: table;
  }
}

# Mixins

like a variable, but with multiple lines of code

@mixin, @include

@mixin clearfix {
    &::after {
    content: "";
    clear: both;
    display: table;
  }
}

nav {
  margin: 30px;
  background-color: $color-primary;
  
  @include clearfix;
}

# Pass Argument to mixin

@mixin style-link-text($color) {
  text-decoration: none;
  text-transform: uppercase;
  color: $color;
}

a {
      @include style-link-text($color-text-dark);
}

# Color-functions

eg darken(), lighten()

background-color: darken($color-secondary, 15%);

.btn-main:link ,
.btn-hot:link {
  padding: 10px;
  display: inline-block;
  text-align: center;
  border-radius: 100px;
  text-decoration: none;
  text-transform: uppercase;
  width: $width-button;
}

.btn-main {
    background-color: $color-secondary;
  &:link {
  }
  
  &:hover {
    background-color: darken($color-secondary, 15%);
  }
}

Example:

* {
  margin: 0;
  padding:0;
}

$color-primary: #f9ed69; // yellow color
$color-secondary: #f08a5d; // orange 
$color-tertiary: #b83b5e; // pink
$color-text-dark: #333;
$color-text-light: #eee;

$width-button: 150px;

nav {
  margin: 30px;
  background-color: $color-primary;
    
  &::after {
    content: "";
    clear: both;
    display: table;
  }
}

.navigation {
  list-style: none;
  float: left;
  
  li {
    display: inline-block;
    margin-left: 30px;
    
    &:first-child {
      margin: 0;
    }
    
    a:link {
      text-decoration: none;
      text-transform: uppercase;
      color: $color-text-dark;
    }
  }
}

.buttons {
  float: right;
}

.btn-main,
.btn-hot {
  padding: 10px;
  display: inline-block;
  text-align: center;
  border-radius: 100px;
  text-decoration: none;
  text-transform: uppercase;
  width: $width-button;
  color: $color-text-light;
}

.btn-main {
  &:link {
    background-color: $color-secondary;
  }
  
  &:hover {
    background-color: darken($color-secondary, 15%);
  }
}

.btn-hot {
  &:link {
    background-color: $color-tertiary;
  }
  
  &:hover {
    background-color: lighten($color-tertiary, 15%);
  }
}

# Functions

not so often used

@function divide($a, $b) {
  @return $a / $b;
}

to add the unit, multiply: * 1px

@function divide($a, $b) {
  @return $a / $b;
}

nav {
  margin: divide(60, 2) * 1px;
  background-color: $color-primary;
  
  @include clearfix;
}

# Extends

placeholder - the other way than mixins

%btn-placeholder {
  padding: 10px;
  display: inline-block;
  text-align: center;
  border-radius: 100px;
  width: $width-button;
  @include style-link-text($color-text-light);
}


.btn-main {
  &:link {
    @extend %btn-placeholder;
    background-color: $color-secondary;
  }
  ...