Initial version

themes/zen/assets/sass/base/links/_links.scss

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+// Links
+//
+// Hyperlinks are used to allow the user to navigate to other resources or to
+// download a resource.
+//
+// The order of link states are based on Eric Meyer's article:
+// http://meyerweb.com/eric/thoughts/2007/06/11/who-ordered-the-link-states
+//
+// :visited - A link that has already been visited.
+// :hover   - A link that is being hovered over.
+// :focus   - A link that has been given keyboard focus.
+// :active  - A link that is being actively clicked.
+
+a,
+%link {
+  color: var(--color-link);
+}
+
+// Any element can receive focus, but only links can be visited, so we can
+// safely lower this selector's specificity. This also ensures visited links
+// with additional styles won't have their styles overridden.
+:visited {
+  color: var(--color-link-visited);
+}
+
+a:hover,
+a:focus {
+  color: var(--color-link-hover);
+}
+
+a:active {
+  color: var(--color-link-active);
+}
+
+// Remove underline from links to current page to
+// indicate that there is no need to click on it.
+[aria-current] {
+  text-decoration: none;
+}
+
+.link-nav,
+%link-nav {
+  a {
+    text-decoration: none;
+
+    &:hover,
+    &:focus {
+      text-decoration: underline;
+    }
+  }
+}
+
+// Inverted links, for dark backgrounds.
+.link-inverted,
+%link-inverted {
+  a {
+    color: var(--color-link-inverted);
+
+    &:visited {
+      color: var(--color-link-visited-inverted);
+    }
+
+    &:hover,
+    &:focus {
+      color: var(--color-link-hover-inverted);
+    }
+
+    &:active {
+      color: var(--color-link-active-inverted);
+    }
+  }
+}