Rewrite styles to scss and use i respective components

src/styles/base.scss

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+:root {
+  --color-gray-dark: #475157;
+  --color-gray-dark-alt: #4F585E;
+  --color-gray-dark-alt2: #434D53;
+  --color-gray-normal: #7f858a;
+  --color-gray-light: #7D878D;
+
+  --color-white: #fff;
+  --color-green: #5CB449;
+  --color-orange: #FAA03D;
+  --color-blue: #40A7D1;
+  --color-marine: #688190;
+  --color-red: #F1235A;
+  --color-brand: #F59134;
+}
+
+@custom-media --until-sm (max-width: 30em);
+@custom-media --until-md (max-width: 48em);
+@custom-media --until-lg (max-width: 61.875em);
+@custom-media --until-xl (max-width: 75em);
+
+
+
+body {
+  background: var(--color-gray-dark);
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+  font-family: 'DIN';
+  font-weight: normal;
+  font-size: 14px;
+  line-height: 1.5;
+
+  & h1 {
+    color: blue;
+  }
+}
+
+#root {
+  min-height: 100vh;
+  overflow: hidden;
+}

src/styles/components/button.scss

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+.button {
+  border: none;
+  background: transparent;
+  position: relative;
+  padding: 10px 10px 10px 35px;
+  margin: 0;
+  font-size: 16px;
+  line-height: 16px;
+  color: var(--color-gray-normal);
+
+  &__icon {
+    position: absolute;
+    left: 5px;
+    top: 50%;
+    margin-top: -11px;
+  }
+}

src/styles/components/content.scss

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+.fullpage-content {
+
+    font-size: 16px;
+    color: var(--color-white);
+
+    & p,
+    & ul {
+        font-weight: lighter
+    }
+
+    & a {
+        color: var(--color-white);
+    }
+
+}

src/styles/components/filter.scss

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+.filter {
+  margin-bottom: 40px;
+
+  /* @todo: re-enable filter for mobile */
+  @media (--until-sm) {
+    display: none;
+  }
+}

src/styles/components/footnote.scss

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+.footnote {
+  font-size: 12px;
+  color: var(--color-gray-normal);
+}

src/styles/components/headline.scss

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+.headline {
+  margin: 0;
+  padding: 0;
+  color: var(--color-white);
+  font-size: 20px;
+  font-weight: normal;
+
+  &--dark {
+    color: var(--color-gray-light);
+  }
+}

src/styles/components/hljs.scss

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+/* copied from here: http://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.10.0/styles/darcula.min.css*/
+.hljs{display:block;overflow-x:auto;padding:0.5em;background:#2b2b2b}.hljs{color:#bababa}.hljs-strong,.hljs-emphasis{color:#a8a8a2}.hljs-bullet,.hljs-quote,.hljs-link,.hljs-number,.hljs-regexp,.hljs-literal{color:#6896ba}.hljs-code,.hljs-selector-class{color:#a6e22e}.hljs-emphasis{font-style:italic}.hljs-keyword,.hljs-selector-tag,.hljs-section,.hljs-attribute,.hljs-name,.hljs-variable{color:#cb7832}.hljs-params{color:#b9b9b9}.hljs-string{color:#6a8759}.hljs-subst,.hljs-type,.hljs-built_in,.hljs-builtin-name,.hljs-symbol,.hljs-selector-id,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-template-tag,.hljs-template-variable,.hljs-addition{color:#e0c46c}.hljs-comment,.hljs-deletion,.hljs-meta{color:#7f7f7f}

src/styles/components/icon-link.scss

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+.icon-link {
+  display: inline-block;
+  position: relative;
+  text-decoration: none;
+  height: 25px;
+  font-size: 14px;
+  line-height: 25px;
+  border: 0;
+  background: none;
+  color: var(--color-gray-normal);
+
+  &--primary {
+    color: var(--color-brand);
+  }
+
+  &--big {
+    font-size: 16px;
+  }
+
+  &__icon {
+    margin-right: 6px;
+    position: relative;
+    top: -1px;
+  }
+
+  &:hover {
+    &:after {
+      content: '';
+      position: absolute;
+      left: 0;
+      bottom: -8px;
+      width: 100%;
+      border-bottom: 2px solid var(--color-gray-normal);
+    }
+  }
+}

src/styles/components/icon.scss

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+.icon {
+  display: inline-block;
+  width: 22px;
+  height: 22px;
+  background-size: 22px 22px;
+  background-repeat: no-repeat;
+  background-position: 0 0;
+  vertical-align: middle;
+
+  &--pie {
+    background-image: url('../../icons/pie.svg');
+  }
+
+  &--question {
+    background-image: url('../../icons/question.svg');
+  }
+
+  &--overview {
+    background-image: url('../../icons/overview.svg');
+  }
+
+  &--search {
+    background-image: url('../../icons/search.svg');
+  }
+
+  &--back {
+    background-image: url('../../icons/back.svg');
+  }
+
+  &--close {
+    background-image: url('../../icons/close.svg');
+  }
+}

src/styles/components/letter-index.scss

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+.letter-index {
+  margin-bottom: 60px;
+  &__group {
+    border-top: 1px solid var(--color-gray-normal);
+    position: relative;
+    padding: 0 0 0 200px;
+    min-height: 80px;
+    @media (--until-md) {
+      padding:  0 0 0 50px;
+    }
+  }
+
+  &__letter {
+    font-size: 50px;
+    line-height: 80px;
+    color: var(--color-gray-normal);
+    position: absolute;
+    left: 50px;
+    top: 0;
+    @media (--until-md) {
+      left: 0;
+    }
+  }
+}

src/styles/components/markdown.scss

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+.markdown {
+  color: var(--color-gray-normal);
+  font-size: 16px;
+
+  p {
+    margin: 20px 0;
+  }
+
+  a {
+    color: var(--color-gray-normal);
+    text-decoration: underline;
+    &:hover {
+      color: var(--color-gray-dark);
+    }
+  }
+
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    color: var(--color-gray-normal);
+  }
+
+  h1 {
+    font-size: 2em;
+    margin: 1em 0;
+    font-weight: 300;
+  }
+
+  h2 {
+    font-size: 1.5em;
+    margin: 1em 0;
+  }
+
+  h3 {
+    font-size: 1.2em;
+    margin: 1em 0;
+  }
+
+  img {
+    max-width: 100%;
+    margin: 10 0 10 0;
+  }
+
+  pre {
+    overflow-x: auto;
+    padding: 10px;
+    background: var(--color-gray-dark);
+    -webkit-overflow-scrolling: touch;
+  }
+}

src/styles/components/nav.scss

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+.nav {
+  white-space: nowrap;
+
+  &__item {
+    display: inline-flex;
+    position: relative;
+    & + .nav__item {
+      margin-left: 20px;
+    }
+  }
+
+  &__search {
+    position: absolute;
+    right: 0;
+    top: 50%;
+    visibility: hidden;
+    overflow: hidden;
+    width: 0;
+    margin-top: -25px;
+    opacity: 0.8;
+    transition:
+      width 400ms cubic-bezier(0.24, 1.12, 0.71, 0.98) 100ms,
+      visibility 0s linear 500ms,
+      opacity 200ms linear;
+
+    &.is-open {
+      opacity: 1;
+      width: 600px;
+      visibility: visible;
+      transition-delay: 0s;
+    }
+  }
+
+  &--relations {
+    @media (--until-md) {
+      .nav__item {
+        display: block;
+        margin: 5px 0 0;
+      }
+    }
+  }
+}

src/styles/components/page.scss

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+.page {
+  max-width: 1200px;
+  min-height: 100%;
+  margin: 0 auto;
+  padding: 0 15px;
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+
+  &__header {
+    flex: 0 0 auto;
+    margin-bottom: 20px;
+    position: relative;
+    z-index: 100;
+
+   @media (--until-sm) {
+     margin: 0
+   }
+
+    @media (--until-lg) {
+      .nav {
+        display: none;
+      }
+    }
+  }
+
+  &__content {
+    flex: 1 1 auto;
+  }
+
+  &__footer {
+    margin-top: 5px;
+    flex: 0 0 auto;
+  }
+}

src/styles/components/publish-date.scss

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+.publish-date {
+    color: var(--color-gray-normal);
+    text-align: right;
+
+    @media (--until-sm) {
+        text-align: center;
+    }
+}

src/styles/components/ring-list.scss

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+.ring-list {
+  &__header {
+    margin-bottom: 20px;
+  }
+  &__item {
+    font-size: 13px;
+    display: block;
+    margin-bottom: 12px;
+  }
+}

src/styles/components/social-icon.scss

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+
+.social-icon {
+  font-weight: normal;
+  font-style: normal;
+  font-size: 16px;  /* Preferred icon size */
+  display: inline-block;
+  line-height: 1;
+  text-transform: none;
+  letter-spacing: normal;
+  word-wrap: normal;
+  white-space: nowrap;
+  direction: ltr;
+  background-color: var(--color-white);
+  border-radius: 50%;
+  padding: 7px;
+  margin: 0 5px 0 5px;
+
+  /* Support for all WebKit browsers. */
+  -webkit-font-smoothing: antialiased;
+  /* Support for Safari and Chrome. */
+  text-rendering: optimizeLegibility;
+
+  /* Support for Firefox. */
+  -moz-osx-font-smoothing: grayscale;
+
+  /* Support for IE. */
+  font-feature-settings: 'liga';
+
+}

src/styles/components/split.scss

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+.split {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+
+  &--align-top {
+    align-items: flex-start;
+  }
+
+  &--overview {
+    min-height: 40px;
+  }
+
+  &__left {
+    flex: 0 1 auto;
+  }
+
+  &__right {
+    flex: 0 1 auto;
+  }
+
+   @media (--until-sm) {
+     display: block;
+   }
+}

src/styles/main.scss

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+@import "./base";
+@import "./components/button";
+@import "./components/content";
+@import "./components/filter";
+@import "./components/footnote";
+@import "./components/headline";
+@import "./components/hljs";
+@import "./components/icon";
+@import "./components/icon-link";
+@import "./components/letter-index";
+@import "./components/markdown";
+@import "./components/nav";
+@import "./components/page";
+@import "./components/publish-date";
+@import "./components/ring-list";
+@import "./components/social-icon";
+@import "./components/split";