// The SCSS is enabled as the CSS preprocessor

// Enable small caps
.allsmallcaps {
  font-feature-settings: "c2sc", "smcp";
 }

// Responsive variables
$phablet-breakpoint: 37em;
$tablet-breakpoint: 48em;
$desktop-breakpoint: 64em;
$large-desktop-breakpoint: 80em;

// Layout variables & mixins
$column: 6.25%;

@mixin width($number) {
  width: #{ $number * $column };
}

@mixin offset($number) {
  margin-left: #{ $number * $column };
}

// Fonts
$font-meta: "ff-meta-serif-web-pro", Georgia, serif;
$font-korolev: "korolev", sans-serif;

// Colours
$red: #F7412D;

// Variables
$base-font-size: 112.5; // Gets used as %, converts to 18px
$line-height: 1.45;
$base: ($base-font-size / 100); // We'll need this for some calculations

// Modular scale
$ratio: 1.5; // Perfect Fifth

// pow and ms functions 
@function pow($number, $exponent) {
  $value: 1;

  @if $exponent > 0 {
    @for $i from 1 through $exponent {
      $value: $value * $number; //Multiply by $number if exponent less than zero
    }
  } @else if $exponent < 0 {
    @for $i from 1 through -$exponent {
      $value: $value / $number; //Divide by $number if exponent less than zero
    }
  }

  @return $value;
}

@function ms($value, $ms-ratio: $ratio, $ms-base: $base){
  $size: pow($ms-ratio, $value) * $ms-base;
  @return #{ $size + "rem" };
}

// Vertical rhythm mixins
@mixin line-height($number) {
  line-height: #{ $number * $line-height + 'rem'};
}

@mixin margin-top($number) {
  margin-top: #{ $number * $line-height + 'rem'};
}

@mixin margin-bottom($number) {
  margin-bottom: #{ $number * $line-height + 'rem'};
}

html {
  font-size: 100%; // = 16 pixels
  
  @media screen and (min-width: $tablet-breakpoint){
    font-size: #{$base-font-size + '%'}; // 112.5% = 18 pixels
  }
  font-family: $font-meta;
  color: #333;
}

// Set line-height and margins for all elements
* {
  @include line-height(1);
  @include margin-bottom(1);
  @include margin-top(0);
}

// [ h1: font-size: [x value from scale], line-height: 2 * 30px, margin-top: 2 * 30px, margin-bottom: 1 * 30px ]
$headings: (
  h1: (1, 1.5, 1, 1),
  h2: (1, 1.5, 2, 0.5),
  h3: (0, 1.5, 2, 0.5),
  h4: (0, 1, 0.25, 0),
  h5: (0, 1, 0.5, 0),
  h6: (0, 1, 0.5, 0)
);

// Set line-heights and margins for headings
@each $heading, $properties in $headings {
  #{$heading} {
    font-size: ms(nth($properties, 1));
    @include line-height(nth($properties, 2));
    @include margin-top(nth($properties, 3));
    @include margin-bottom(nth($properties, 4));
  }
}

h1, h2, h3, h4, h5, h6 {
  font-family: $font-korolev;
  font-weight: 500;
}

.main-body {
  @include width(14);
  @include offset(2);
  
  @media screen and (min-width: $desktop-breakpoint){
    @include width(9);
    @include offset(2);
    float: left;
  }
}

.post-meta {
  color: #999;
  
  a {
    color: #999;
    text-decoration: underline;
  }
}

.sidebar {
  @include width(13);
  @include offset(2);
  
  @media screen and (min-width: $desktop-breakpoint){
    @include width(3);
    @include margin-top(2);
    @include offset(1);
    float: left;  
  }
  
  h1 {
    text-transform: uppercase;
    font-size: ms(0);
    @include margin-top(2);
    @include margin-bottom(0);
  }
  
  ul {
    list-style: none;
    padding: 0;
  }
  
  a {
    font-family: $font-korolev;
    display: block;
    @include margin-bottom(0);
  }
  
  .carbon {
    max-width: 265px;
  }
}

header {
  @include margin-top(2);
  @include margin-bottom(1);
  font-family: $font-korolev;
  
  &:after {
    content: "";
    display: table;
    clear: both;
  }
  
  @media screen and (min-width: $tablet-breakpoint){
    margin-bottom: 0;
  }
}

.mobile-nav {
  float: right;
  margin-right: 10%;
  
  svg {
    margin-bottom: 0;
    margin-right: 10px;
    fill: $red;
  }
  
  @media screen and (min-width: $tablet-breakpoint){
    display: none;
  }
}

.main-nav {
  display: none;
  
  @media screen and (min-width: $tablet-breakpoint){
    display: inline-block;
  }
  
  ul {
    list-style: none;
    margin-bottom: 0;
  }
  
  li {
    display: inline-block;
    margin-right: 20px;
    margin-bottom: 0;
  }
}

.logo-wrap {
  text-transform: uppercase;
  font-size: ms(0);
  display: inline;
  float: left;
  margin-right: 40px;
  margin-bottom: 0;
  
  img {
    margin-bottom: 0;
  }
}

.logo {
  max-width: 48px;
  float: left;
}

small, figcaption {
  font-size: ms(-1);
}

.big-quote {
  font-family: $font-korolev;
  font-size: ms(0);
  max-width: 90%;
  font-weight: 300;
  font-style: italic;
  margin-left: 0;
  @include line-height(1);
  text-indent: -0.4em;
  
  @media screen and (min-width: $phablet-breakpoint){
    float: right;
    max-width: 10em;
    margin-left: 2em;
    @include margin-bottom(0.5);
  }
  
  @media screen and (min-width: $large-desktop-breakpoint){
    font-size: ms(1);
    @include line-height(1.5);
  }
}

article {
  
  h1 {
    font-style: normal;
    @include offset(-1);
    max-width: 100%;
    
    @media screen and (min-width: $phablet-breakpoint){
      font-size: ms(2);
      @include line-height(2);
    }
    @media screen and (min-width: $tablet-breakpoint){
      font-size: ms(3);
      @include line-height(3);
      max-width: 95%;
    }
    @media screen and (min-width: $desktop-breakpoint){
      @include offset(-2);
      max-width: 13em;
    }
  }
  
  p {
    max-width: 90%; 
    
    @media screen and (min-width: $tablet-breakpoint){
      max-width: 33em;
    }
  }
  
  img {
    max-width: 100%;
  }
}

a {
  color: $red;
  text-decoration: none;
  
  &:hover {
    color: lighten($red, 10%);
  }
  
  &:active {
    color: lighten($red, 20%);
  }
}

.twitter-link {
  font-family: $font-korolev;
}

// Apply the baseline grid as background
.grid {
  background-image: linear-gradient(to bottom, hsla(200, 100%, 50%, 0.3) 1px, transparent 1px);
  background-repeat: repeat;
  background-position: left top;
  background-size: 100% #{($base-font-size / 100 * 16) * $line-height + "px"};
}

.double-grid {
  @extend .grid;
  background-image: linear-gradient(to bottom, hsla(200, 100%, 50%, 0.3) 1px, transparent 1px), linear-gradient(to bottom, hsla(200, 100%, 50%, 0.3) 1px, transparent 1px, transparent #{ 0.5 * ($base-font-size / 100 * 16) * $line-height + "px"}, hsla(200, 100%, 50%, 0.2) #{ 0.5 * ($base-font-size / 100 * 16) * $line-height + "px"}, transparent #{ 0.5 * ($base-font-size / 100 * 16) * $line-height + 1 + "px"}, transparent #{($base-font-size / 100 * 16) * $line-height + "px"});
}