diff --git a/src/js/_components/_apollo.cache.js b/src/js/_components/_apollo.cache.js
new file mode 100644
index 0000000..6599de2
--- /dev/null
+++ b/src/js/_components/_apollo.cache.js
@@ -0,0 +1,19 @@
+import { InMemoryCache } from '@apollo/client';
+
+//import { IonicStorageModule } from '@ionic/storage';
+//import { persistCache, IonicStorageWrapper } from 'apollo3-cache-persist';
+import { persistCacheSync, LocalStorageWrapper } from 'apollo3-cache-persist';
+
+const cache = new InMemoryCache();
+
+// await before instantiating ApolloClient, else queries might run before the cache is persisted
+//await persistCache({
+persistCacheSync({
+  cache,
+  storage: new LocalStorageWrapper(window.localStorage),
+  key: 'web-persist',
+  maxSize: 1048576, // 1Mb
+  //new IonicStorageWrapper(IonicStorageModule),
+});
+
+export { cache };
diff --git a/src/js/_components/_element.jsx b/src/js/_components/_element.jsx
new file mode 100644
index 0000000..12172a8
--- /dev/null
+++ b/src/js/_components/_element.jsx
@@ -0,0 +1,208 @@
+/*
+ * Lightbox window
+ */
+import { Component } from 'react';
+import Events from '../_events';
+
+import { client } from './_apollo';
+import { gql } from '@apollo/client';
+
+class Page extends Component {
+	state = {
+		type: [],
+		shown: false,
+		loading: false,
+		error: false,
+		current: null,
+		ID: null,
+		URLSegment: null,
+		ClassName: 'Page',
+		CSSClass: null,
+		Title: null,
+		Summary: null,
+		Link: null,
+		URL: null,
+		Elements: [],
+		page: null,
+	};
+
+	componentDidUpdate() {
+		const ui = this;
+
+		if (ui.state.Title) {
+			document.title = ui.state.Title;
+
+			if (ui.state.URL) {
+				window.history.pushState(
+					{ page: JSON.stringify(ui.state) },
+					ui.state.Title,
+					ui.state.URL,
+				);
+			}
+		}
+
+		if (ui.state.Elements.length) {
+			window.dispatchEvent(new Event(Events.AJAX));
+		}
+	}
+
+	constructor(props) {
+		super(props);
+
+		const ui = this;
+		ui.name = ui.constructor.name;
+		console.log(`${ui.name}: init`);
+	}
+
+	reset = () => {
+		const ui = this;
+
+		ui.setState({
+			type: [],
+			shown: false,
+			loading: false,
+			error: false,
+			ID: null,
+			Title: null,
+			URL: null,
+			Elements: [],
+		});
+	};
+
+	load = (link) => {
+		const ui = this;
+		const query = gql(`
+			query Pages {
+			  readPages(URLSegment: "home", limit: 1, offset: 0) {
+			    edges {
+			      node {
+			        __typename
+			        _id
+			        ID
+			        Title
+			        ClassName
+			        CSSClass
+			        Summary
+			        Link
+			        URLSegment
+			        Elements {
+			          edges {
+			            node {
+			              __typename
+			        	 _id
+			              ID
+			              Title
+			              Render
+			            }
+			          }
+			          pageInfo {
+			            hasNextPage
+			            hasPreviousPage
+			            totalCount
+			          }
+			        }
+			      }
+			    }
+			    pageInfo {
+			      hasNextPage
+			      hasPreviousPage
+			      totalCount
+			    }
+			  }
+			}
+		`);
+
+		ui.reset();
+		ui.setState({
+			Title: 'Loading ...',
+			loading: true,
+		});
+		console.log(client.readQuery({ query }));
+		client
+			.query({
+				query: query,
+			})
+			.then((resp) => {
+				const page = resp.data.readPages.edges[0].node;
+
+				// write to cache
+				client.writeQuery({ query, data: { resp } });
+				console.log(client.readQuery({ query }));
+
+				ui.setState({
+					ID: page.ID,
+					Title: page.Title,
+					ClassName: page.ClassName,
+					URLSegment: page.URLSegment,
+					CSSClass: page.CSSClass,
+					Summary: page.Summary,
+					Link: page.Link,
+					Elements: page.Elements.edges,
+					URL: page.Link || link,
+					loading: false,
+				});
+			})
+			.catch((error) => {
+				console.error(error);
+
+				let msg = '';
+
+				if (error.response) {
+					switch (error.response.status) {
+						case 404:
+							msg = 'Not Found.';
+							break;
+						case 500:
+							msg = 'Server issue, please try again latter.';
+							break;
+						default:
+							msg = 'Something went wrong.';
+							break;
+					}
+				} else if (error.request) {
+					msg = 'No response received';
+				} else {
+					console.warn('Error', error.message);
+				}
+
+				ui.setState({ error: msg });
+			});
+	};
+
+	getHtml = (html) => {
+		const decodeHtmlEntity = (input) => {
+			var doc = new DOMParser().parseFromString(input, 'text/html');
+			return doc.documentElement.textContent;
+		};
+
+		return { __html: decodeHtmlEntity(html) };
+	};
+
+	render() {
+		const ui = this;
+		const name = ui.name;
+		const className = `elemental-area page-${ui.state.CSSClass} url-${ui.state.URLSegment}`;
+
+		const ElementItem = (props) => (
+			<div dangerouslySetInnerHTML={props.html}></div>
+		);
+
+		let html = '';
+		if (ui.state.Elements.length) {
+			ui.state.Elements.map((el) => {
+				html += el.node.Render;
+			});
+		} else {
+			html += '<div class="loading">Loading ...</div>';
+		}
+
+		return (
+			<div
+				className={className}
+				dangerouslySetInnerHTML={ui.getHtml(html)}
+			></div>
+		);
+	}
+}
+
+export default Page;
diff --git a/src/js/_components/_main.css-screen-size.js b/src/js/_components/_main.css-screen-size.js
new file mode 100644
index 0000000..c1749e3
--- /dev/null
+++ b/src/js/_components/_main.css-screen-size.js
@@ -0,0 +1,54 @@
+// browser tab visibility state detection
+
+import Events from '../_events';
+import Consts from '../_consts';
+
+export default ((W) => {
+  const NAME = '_main.css-screen-size';
+  const D = document;
+  const BODY = D.body;
+
+  const detectCSSScreenSize = () => {
+    const el = D.createElement('div');
+    el.className = 'env-test';
+    BODY.appendChild(el);
+
+    const envs = [...Consts.ENVS].reverse();
+    let curEnv = envs.shift();
+    BODY.classList.remove(...envs);
+
+    for (let i = 0; i < envs.length; ++i) {
+      const env = envs[i];
+      el.classList.add(`d-${env}-none`);
+
+      if (W.getComputedStyle(el).display === 'none') {
+        curEnv = env;
+        BODY.classList.add(`${curEnv}`);
+        break;
+      }
+    }
+
+    let landscape = true;
+    if (W.innerWidth > W.innerHeight) {
+      BODY.classList.add('landscape');
+      BODY.classList.remove('portrait');
+    } else {
+      landscape = false;
+
+      BODY.classList.add('portrait');
+      BODY.classList.remove('landscape');
+    }
+
+    console.log(
+      `${NAME}: screen size detected ${curEnv} | landscape ${landscape}`,
+    );
+
+    BODY.removeChild(el);
+
+    return curEnv;
+  };
+
+  W.addEventListener(`${Events.LOADED}`, detectCSSScreenSize);
+
+  W.addEventListener(`${Events.RESIZE}`, detectCSSScreenSize);
+})(window);
diff --git a/src/js/_components/_main.links.js b/src/js/_components/_main.links.js
new file mode 100644
index 0000000..5414822
--- /dev/null
+++ b/src/js/_components/_main.links.js
@@ -0,0 +1,146 @@
+// browser tab visibility state detection
+
+import Events from '../_events';
+import Consts from '../_consts';
+import Page from './_page.jsx';
+
+const MainUILinks = ((W) => {
+  const NAME = '_main.links';
+  const D = document;
+  const BODY = D.body;
+
+  class MainUILinks {
+    static init() {
+      const ui = this;
+      ui.GraphPage = null;
+
+      console.log(`${NAME}: init`);
+
+      ui.loaded();
+
+      // history state switch
+      W.addEventListener('popstate', (e) => {
+        ui.popState(e);
+      });
+    }
+
+    static loaded() {
+      const ui = this;
+
+      D.querySelectorAll('.graphql-page').forEach((el, i) => {
+        const el_id = el.getAttribute('href');
+        el.setAttribute(`data-${ui.name}-id`, el_id);
+
+        el.addEventListener('click', ui.loadClick);
+      });
+    }
+
+    static reset() {
+      // reset focus
+      D.activeElement.blur();
+
+      // remove active and loading classes
+      D.querySelectorAll('.graphql-page,.nav-item').forEach((el2) => {
+        el2.classList.remove('active');
+        el2.classList.remove('loading');
+      });
+    }
+
+    static popState(e) {
+      const ui = this;
+
+      if (!ui.GraphPage) {
+        console.log(
+          `${NAME}: [popstate] GraphPage is missing. Have to render it first`,
+        );
+
+        ui.GraphPage = ReactDOM.render(
+          <Page />,
+          document.getElementById('MainContent'),
+        );
+      }
+
+      if (e.state && e.state.page) {
+        console.log(`${NAME}: [popstate] load`);
+        const state = JSON.parse(e.state.page);
+
+        state.current = null;
+        state.popstate = true;
+
+        ui.reset();
+        D.querySelectorAll(`[data-${ui.name}-id="${e.state.link}"]`).forEach(
+          (el) => {
+            el.classList.add('active');
+          },
+        );
+
+        ui.GraphPage.setState(state);
+      } else if (e.state && e.state.landing) {
+        console.log(`${NAME}: [popstate] go to landing`);
+        W.location.href = e.state.landing;
+      } else {
+        console.warn(`${NAME}: [popstate] state is missing`);
+        console.log(e);
+      }
+    }
+
+    // link specific event {this} = current link, not MainUILinks
+    static loadClick(e) {
+      console.groupCollapsed(`${NAME}: load on click`);
+      const ui = MainUILinks;
+      ui.reset();
+
+      e.preventDefault();
+
+      if (!ui.GraphPage) {
+        ui.GraphPage = ReactDOM.render(
+          <Page />,
+          document.getElementById('MainContent'),
+        );
+      }
+
+      const el = e.currentTarget;
+      const link = el.getAttribute('href') || el.getAttribute('data-href');
+
+      ui.GraphPage.state.current = el;
+
+      el.classList.add('loading');
+      ui.GraphPage.load(link)
+        .then((response) => {
+          el.classList.remove('loading');
+          el.classList.add('active');
+
+          if (ui.GraphPage.state.Link) {
+            window.history.pushState(
+              {
+                page: JSON.stringify(ui.GraphPage.state),
+                link: el.getAttribute(`data-${ui.name}-id`),
+              },
+              ui.GraphPage.state.Title,
+              ui.GraphPage.state.Link,
+            );
+          }
+
+          console.groupEnd(`${NAME}: load on click`);
+        })
+        .catch((e) => {
+          console.log(e);
+
+          el.classList.remove('loading');
+          el.classList.add('not-found');
+
+          console.groupEnd(`${NAME}: load on click`);
+        });
+    }
+  }
+
+  W.addEventListener(`${Events.LOADED}`, () => {
+    MainUILinks.init();
+  });
+
+  W.addEventListener(`${Events.AJAX}`, () => {
+    MainUILinks.loaded();
+  });
+})(window);
+
+export default MainUILinks;
diff --git a/src/js/_components/_main.online.js b/src/js/_components/_main.online.js
new file mode 100644
index 0000000..1fbdb31
--- /dev/null
+++ b/src/js/_components/_main.online.js
@@ -0,0 +1,101 @@
+// ping online/offline state switch and detection
+
+import Events from '../_events';
+import Consts from '../_consts';
+
+const axios = require('axios');
+
+export default ((W) => {
+  const NAME = '_main.online';
+  const D = document;
+  const BODY = D.body;
+
+  let pingInterval;
+  const PING_META = D.querySelector('meta[name="ping"]');
+
+  let update_online_status_lock = false;
+  const UPDATE_ONLINE_STATUS = (online) => {
+    if (update_online_status_lock) {
+      return;
+    }
+
+    update_online_status_lock = true;
+    if (online) {
+      if (BODY.classList.contains('is-offline')) {
+        console.log(`${NAME}: back Online`);
+        W.dispatchEvent(new Event(Events.BACKONLINE));
+      } else {
+        console.log(`${NAME}: Online`);
+        W.dispatchEvent(new Event(Events.ONLINE));
+      }
+
+      BODY.classList.add('is-online');
+      BODY.classList.remove('is-offline');
+
+      if (PING_META && !pingInterval) {
+        console.log(`${NAME}: SESSION_PING is active`);
+        pingInterval = setInterval(SESSION_PING, 300000); // 5 min in ms
+      }
+    } else {
+      console.log(`${NAME}: Offline`);
+
+      BODY.classList.add('is-offline');
+      BODY.classList.remove('is-online');
+
+      clearInterval(pingInterval);
+      pingInterval = null;
+
+      W.dispatchEvent(new Event(Events.OFFLINE));
+    }
+
+    update_online_status_lock = false;
+  };
+
+  // session ping
+  let session_ping_lock = false;
+  const SESSION_PING = () => {
+    if (session_ping_lock || BODY.classList.contains('is-offline')) {
+      return;
+    }
+
+    const PING_URL = PING_META.getAttribute('content');
+
+    console.log(`${NAME}: session ping`);
+    session_ping_lock = true;
+
+    axios
+      .post(PING_URL, {})
+      .then((resp) => {
+        session_ping_lock = false;
+        UPDATE_ONLINE_STATUS(true);
+      })
+      .catch((error) => {
+        console.error(error);
+        console.warn(`${NAME}: SESSION_PING failed`);
+
+        session_ping_lock = false;
+        UPDATE_ONLINE_STATUS(false);
+      });
+  };
+
+  // current browser online state
+  if (typeof navigator.onLine !== 'undefined') {
+    if (!navigator.onLine) {
+      UPDATE_ONLINE_STATUS(false);
+    } else {
+      UPDATE_ONLINE_STATUS(true);
+    }
+  }
+
+  W.addEventListener(`${Events.OFFLINE}`, () => {
+    UPDATE_ONLINE_STATUS(false);
+  });
+
+  W.addEventListener(`${Events.ONLINE}`, () => {
+    UPDATE_ONLINE_STATUS(true);
+  });
+
+  W.addEventListener(`${Events.LOADED}`, () => {
+    UPDATE_ONLINE_STATUS(true);
+  });
+})(window);
diff --git a/src/js/_components/_main.touch.js b/src/js/_components/_main.touch.js
new file mode 100644
index 0000000..9828a20
--- /dev/null
+++ b/src/js/_components/_main.touch.js
@@ -0,0 +1,70 @@
+// touch/mouse detection
+
+import Events from '../_events';
+import Consts from '../_consts';
+
+export default ((W) => {
+  const NAME = '_main.touch';
+  const D = document;
+  const BODY = D.body;
+
+  let prev_touch_event_name;
+  let touch_timeout;
+  const SET_TOUCH_SCREEN = (bool, event_name) => {
+    if (touch_timeout || event_name === prev_touch_event_name) {
+      return;
+    }
+
+    if (bool) {
+      console.log(`${NAME}: Touch screen enabled`);
+
+      BODY.classList.add('is-touch');
+      BODY.classList.remove('is-mouse');
+
+      W.dispatchEvent(new Event(Events.TOUCHENABLE));
+    } else {
+      console.log(`${NAME}: Touch screen disabled`);
+
+      BODY.classList.add('is-mouse');
+      BODY.classList.remove('is-touch');
+
+      W.dispatchEvent(new Event(Events.TOUCHDISABLED));
+    }
+
+    prev_touch_event_name = event_name;
+    // prevent firing touch and mouse events together
+    if (!touch_timeout) {
+      touch_timeout = setTimeout(() => {
+        clearTimeout(touch_timeout);
+        touch_timeout = null;
+      }, 500);
+    }
+  };
+
+  SET_TOUCH_SCREEN(
+    'ontouchstart' in W ||
+      navigator.MaxTouchPoints > 0 ||
+      navigator.msMaxTouchPoints > 0 ||
+      W.matchMedia('(hover: none)').matches,
+    'init',
+  );
+
+  D.addEventListener('touchend', (e) => {
+    let touch = false;
+    if (e.type !== 'click') {
+      touch = true;
+    }
+
+    SET_TOUCH_SCREEN(touch, 'click-touchend');
+  });
+
+  // disable touch on mouse events
+  D.addEventListener('click', (e) => {
+    let touch = false;
+    if (e.type !== 'click') {
+      touch = true;
+    }
+
+    SET_TOUCH_SCREEN(touch, 'click-touchend');
+  });
+})(window);
diff --git a/src/js/_components/_main.visibility.js b/src/js/_components/_main.visibility.js
new file mode 100644
index 0000000..8459a35
--- /dev/null
+++ b/src/js/_components/_main.visibility.js
@@ -0,0 +1,34 @@
+// browser tab visibility state detection
+
+import Events from '../_events';
+import Consts from '../_consts';
+
+export default ((W) => {
+  const NAME = '_main.visibility';
+  const D = document;
+  const BODY = D.body;
+
+  // update visibility state
+  // get browser window visibility preferences
+  // Opera 12.10, Firefox >=18, Chrome >=31, IE11
+  const HiddenName = 'hidden';
+  const VisibilityChangeEvent = 'visibilitychange';
+
+  D.addEventListener(VisibilityChangeEvent, () => {
+    if (D.visibilityState === HiddenName) {
+      console.log(`${NAME}: Tab: hidden`);
+
+      BODY.classList.add('is-hidden');
+      BODY.classList.remove('is-focused');
+
+      W.dispatchEvent(new Event(Events.TABHIDDEN));
+    } else {
+      console.log(`${NAME}: Tab: focused`);
+
+      BODY.classList.add('is-focused');
+      BODY.classList.remove('is-hidden');
+
+      W.dispatchEvent(new Event(Events.TABFOCUSED));
+    }
+  });
+})(window);