diff --git a/flake.nix b/flake.nix
index 401db06..90279a9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,6 +23,7 @@
         in
         {
           api = pkgs.mkShell {
+            packages = with pkgs; [ postgresql_16 ];
             shellHook = ''
               alias dbmate="${pkgs.dbmate}/bin/dbmate --url postgres://postgres@localhost:15432/archtika?sslmode=disable"
               alias formatsql="${pkgs.pgformatter}/bin/pg_format -s 2 -f 2 -U 2 -i db/migrations/*.sql"
diff --git a/web-app/src/app.css b/web-app/src/app.css
index e01e5e4..e4deba5 100644
--- a/web-app/src/app.css
+++ b/web-app/src/app.css
@@ -12,6 +12,40 @@
   --border-primary: 0.0625rem solid var(--bg-tertiary);
   --border-radius: 0.125rem;
 
+  /* Step -1: 14.9953px → 14.9953px */
+  --font-size--1: clamp(0.9372rem, 0.9372rem + 0cqi, 0.9372rem);
+  /* Step 0: 16px → 16px */
+  --font-size-0: clamp(1rem, 1rem + 0cqi, 1rem);
+  /* Step 1: 17.072px → 17.072px */
+  --font-size-1: clamp(1.067rem, 1.067rem + 0cqi, 1.067rem);
+  /* Step 2: 18.2158px → 18.2158px */
+  --font-size-2: clamp(1.1385rem, 1.1385rem + 0cqi, 1.1385rem);
+  /* Step 3: 19.4363px → 19.4363px */
+  --font-size-3: clamp(1.2148rem, 1.2148rem + 0cqi, 1.2148rem);
+  /* Step 4: 20.7385px → 20.7385px */
+  --font-size-4: clamp(1.2962rem, 1.2962rem + 0cqi, 1.2962rem);
+  /* Step 5: 22.128px → 22.128px */
+  --font-size-5: clamp(1.383rem, 1.383rem + 0cqi, 1.383rem);
+
+  /* Space 3xs: 4px → 5px */
+  --space-3xs: clamp(0.25rem, 0.2336rem + 0.0822cqi, 0.3125rem);
+  /* Space 2xs: 8px → 10px */
+  --space-2xs: clamp(0.5rem, 0.4671rem + 0.1645cqi, 0.625rem);
+  /* Space xs: 12px → 15px */
+  --space-xs: clamp(0.75rem, 0.7007rem + 0.2467cqi, 0.9375rem);
+  /* Space s: 16px → 20px */
+  --space-s: clamp(1rem, 0.9342rem + 0.3289cqi, 1.25rem);
+  /* Space m: 24px → 30px */
+  --space-m: clamp(1.5rem, 1.4013rem + 0.4934cqi, 1.875rem);
+  /* Space l: 32px → 40px */
+  --space-l: clamp(2rem, 1.8684rem + 0.6579cqi, 2.5rem);
+  /* Space xl: 48px → 60px */
+  --space-xl: clamp(3rem, 2.8026rem + 0.9868cqi, 3.75rem);
+  /* Space 2xl: 64px → 80px */
+  --space-2xl: clamp(4rem, 3.7368rem + 1.3158cqi, 5rem);
+  /* Space 3xl: 96px → 120px */
+  --space-3xl: clamp(6rem, 5.6053rem + 1.9737cqi, 7.5rem);
+
   color-scheme: light;
 }
 
@@ -51,11 +85,11 @@ body {
 section {
   display: flex;
   flex-direction: column;
-  gap: 1rem;
+  gap: var(--space-s);
 }
 
 section + section {
-  margin-block-start: 2rem;
+  margin-block-start: var(--space-l);
 }
 
 button,
@@ -63,7 +97,8 @@ label,
 select,
 summary,
 [role="button"],
-[role="option"] {
+[role="option"],
+label[for="toggle-mobile-preview"] {
   cursor: pointer;
 }
 
@@ -71,13 +106,14 @@ input,
 button,
 textarea,
 select,
-a[role="button"] {
+a[role="button"],
+label[for="toggle-mobile-preview"] {
   font: inherit;
   color: inherit;
   border: var(--border-primary);
   border-radius: var(--border-radius);
-  padding-inline: 0.5rem;
-  padding-block: 0.25rem;
+  padding-inline: var(--space-2xs);
+  padding-block: var(--space-3xs);
 }
 
 input,
@@ -90,6 +126,10 @@ textarea {
   resize: vertical;
 }
 
+input[type="file"] {
+  inline-size: 100%;
+}
+
 a {
   color: var(--color-accent);
 }
@@ -101,14 +141,21 @@ a[role="button"] {
 }
 
 button,
-a[role="button"] {
+a[role="button"],
+label[for="toggle-mobile-preview"] {
   background-color: var(--bg-secondary);
 }
 
-:is(button, a[role="button"]):hover {
+:is(button, a[role="button"], label[for="toggle-mobile-preview"]):hover {
   background-color: var(--bg-tertiary);
 }
 
+:is(a, button, input, textarea, select):focus,
+#toggle-mobile-preview:checked + label {
+  outline: 0.125rem solid var(--color-accent);
+  outline-offset: 0.25rem;
+}
+
 img,
 picture,
 svg,
@@ -132,18 +179,29 @@ h6 {
   overflow-wrap: break-word;
 }
 
-h1,
-h2,
-h3,
+h6 {
+  font-size: var(--font-size-0);
+}
+h5 {
+  font-size: var(--font-size-1);
+}
 h4 {
-  line-height: 1.2;
-  text-wrap: balance;
+  font-size: var(--font-size-2);
+}
+h3 {
+  font-size: var(--font-size-3);
+}
+h2 {
+  font-size: var(--font-size-4);
+}
+h1 {
+  font-size: var(--font-size-5);
 }
 
 form[method="POST"] {
   display: flex;
   flex-direction: column;
-  gap: 1rem;
+  gap: var(--space-s);
 }
 
 form > button[type="submit"] {
@@ -152,7 +210,7 @@ form > button[type="submit"] {
 
 form[method="GET"] {
   display: grid;
-  gap: 1rem;
+  gap: var(--space-s);
   grid-template-columns: repeat(auto-fit, minmax(min(100%, 20ch), 1fr));
   align-items: start;
 }
@@ -164,7 +222,7 @@ form[method="GET"] > button[type="submit"] {
 form label {
   display: flex;
   flex-direction: column;
-  gap: 0.25rem;
+  gap: var(--space-2xs);
   max-inline-size: 30ch;
 }
 
@@ -175,6 +233,6 @@ form label:has(textarea) {
 form .file-field {
   display: flex;
   align-items: end;
-  gap: 0.5rem;
+  gap: var(--space-2xs);
   flex-wrap: wrap;
 }
diff --git a/web-app/src/lib/components/Modal.svelte b/web-app/src/lib/components/Modal.svelte
index 445c146..a5f5683 100644
--- a/web-app/src/lib/components/Modal.svelte
+++ b/web-app/src/lib/components/Modal.svelte
@@ -25,7 +25,7 @@
     display: flex;
     flex-direction: column;
     align-items: center;
-    padding: 1rem;
+    padding: var(--space-s);
   }
 
   .modal__closeoverlay {
@@ -38,15 +38,15 @@
   .modal__content {
     display: flex;
     flex-direction: column;
-    gap: 2rem;
-    padding-inline: 1rem;
-    padding-block: 2rem;
+    gap: var(--space-s);
+    padding-inline: var(--space-s);
+    padding-block: var(--space-m);
     background-color: var(--bg-primary);
     border-radius: var(--border-radius);
     border: var(--border-primary);
     inline-size: 300px;
     max-inline-size: 100%;
-    max-block-size: calc(100vh - 2rem);
+    max-block-size: calc(100vh - var(--space-m));
     overflow-y: auto;
     z-index: 20;
   }
diff --git a/web-app/src/lib/components/SuccessOrError.svelte b/web-app/src/lib/components/SuccessOrError.svelte
index 436145e..3b52515 100644
--- a/web-app/src/lib/components/SuccessOrError.svelte
+++ b/web-app/src/lib/components/SuccessOrError.svelte
@@ -16,10 +16,12 @@
 <style>
   .toast {
     position: fixed;
-    inset-block-end: 1rem;
-    inset-inline-end: 1rem;
-    padding-inline: 1rem;
-    padding-block: 0.5rem;
+    inset-block-end: var(--space-s);
+    inset-inline-end: var(--space-s);
+    margin-inline-start: var(--space-s);
+    padding-inline: var(--space-xs);
+    padding-block: var(--space-2xs);
+    text-align: center;
     border-radius: var(--border-radius);
     color: var(--color-text-invert);
     z-index: 30;
diff --git a/web-app/src/lib/components/WebsiteEditor.svelte b/web-app/src/lib/components/WebsiteEditor.svelte
index 4c8b051..a245f30 100644
--- a/web-app/src/lib/components/WebsiteEditor.svelte
+++ b/web-app/src/lib/components/WebsiteEditor.svelte
@@ -17,14 +17,27 @@
   }>();
 </script>
 
+<input type="checkbox" id="toggle-mobile-preview" hidden />
+<label for="toggle-mobile-preview">Preview</label>
+
 <div class="operations">
   <h1>{title}</h1>
 
   <nav class="operations__nav">
-    <a href="/website/{id}">Settings</a>
-    <a href="/website/{id}/articles">Articles</a>
-    <a href="/website/{id}/collaborators">Collaborators</a>
-    <a href="/website/{id}/publish">Publish</a>
+    <ul>
+      <li>
+        <a href="/website/{id}">Settings</a>
+      </li>
+      <li>
+        <a href="/website/{id}/articles">Articles</a>
+      </li>
+      <li>
+        <a href="/website/{id}/collaborators">Collaborators</a>
+      </li>
+      <li>
+        <a href="/website/{id}/publish">Publish</a>
+      </li>
+    </ul>
   </nav>
 
   {@render children()}
@@ -39,27 +52,36 @@
 </div>
 
 <style>
+  label[for="toggle-mobile-preview"] {
+    position: absolute;
+    inset-block-start: -0.0625rem;
+    inset-inline-start: 50%;
+    transform: translateX(-50%);
+    display: flex;
+    gap: var(--space-2xs);
+  }
+
+  #toggle-mobile-preview:checked ~ .operations {
+    display: none;
+  }
+
+  #toggle-mobile-preview:checked ~ .preview {
+    display: flex;
+  }
+
   .operations,
   .preview {
-    padding: 1rem;
+    padding: var(--space-s);
+    padding-block-start: var(--space-xl);
     overflow-y: auto;
   }
 
-  .operations {
-    border-inline-end: var(--border-primary);
-  }
-
-  .operations__nav {
-    margin-block: 1rem 2rem;
+  .operations__nav > ul {
+    margin-block: var(--space-s) var(--space-m);
     display: flex;
-    gap: 1rem;
-    overflow-x: auto;
-  }
-
-  .preview {
-    display: flex;
-    flex-direction: column;
-    gap: 1rem;
+    flex-wrap: wrap;
+    column-gap: var(--space-s);
+    row-gap: var(--space-3xs);
   }
 
   iframe {
@@ -67,4 +89,26 @@
     block-size: 100%;
     border: var(--border-primary);
   }
+
+  .preview {
+    display: none;
+    flex-direction: column;
+    gap: var(--space-s);
+  }
+
+  @media (min-width: 640px) {
+    label[for="toggle-mobile-preview"] {
+      display: none;
+    }
+
+    .operations {
+      border-inline-end: var(--border-primary);
+      padding-block-start: var(--space-s);
+    }
+
+    .preview {
+      display: flex;
+      padding-block-start: var(--space-s);
+    }
+  }
 </style>
diff --git a/web-app/src/routes/(authenticated)/+page.server.ts b/web-app/src/routes/(authenticated)/+page.server.ts
index d9a63ab..d896d21 100644
--- a/web-app/src/routes/(authenticated)/+page.server.ts
+++ b/web-app/src/routes/(authenticated)/+page.server.ts
@@ -1,9 +1,10 @@
 import type { Actions, PageServerLoad } from "./$types";
 import { API_BASE_PREFIX } from "$lib/utils";
 
-export const load: PageServerLoad = async ({ fetch, cookies, url }) => {
+export const load: PageServerLoad = async ({ fetch, cookies, url, locals }) => {
   const searchQuery = url.searchParams.get("website_search_query");
   const sortBy = url.searchParams.get("website_sort");
+  const filterBy = url.searchParams.get("website_filter");
 
   const params = new URLSearchParams();
 
@@ -29,6 +30,15 @@ export const load: PageServerLoad = async ({ fetch, cookies, url }) => {
       break;
   }
 
+  switch (filterBy) {
+    case "creations":
+      params.append("user_id", `eq.${locals.user.id}`);
+      break;
+    case "shared":
+      params.append("user_id", `not.eq.${locals.user.id}`);
+      break;
+  }
+
   const constructedFetchUrl = `${baseFetchUrl}?${params.toString()}`;
 
   const totalWebsitesData = await fetch(baseFetchUrl, {
diff --git a/web-app/src/routes/(authenticated)/+page.svelte b/web-app/src/routes/(authenticated)/+page.svelte
index 8ec8870..746bd44 100644
--- a/web-app/src/routes/(authenticated)/+page.svelte
+++ b/web-app/src/routes/(authenticated)/+page.svelte
@@ -157,24 +157,24 @@
 <style>
   .website-grid {
     display: grid;
-    gap: 1rem;
+    gap: var(--space-s);
     grid-template-columns: repeat(auto-fit, minmax(min(100%, 35ch), 1fr));
-    margin-block-start: 1rem;
+    margin-block-start: var(--space-m);
   }
 
   .website-card {
     border: var(--border-primary);
     display: flex;
     flex-direction: column;
-    gap: 1rem;
-    padding-inline: 1rem;
-    padding-block: 2rem;
+    gap: var(--space-s);
+    padding-inline: var(--space-s);
+    padding-block: var(--space-m);
   }
 
   .website-card__actions {
     display: flex;
     align-items: center;
-    gap: 0.5rem;
+    gap: var(--space-2xs);
     flex-wrap: wrap;
   }
 </style>
diff --git a/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.server.ts b/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.server.ts
index da0bd19..cfaa6e2 100644
--- a/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.server.ts
+++ b/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.server.ts
@@ -1,9 +1,10 @@
 import type { Actions, PageServerLoad } from "./$types";
 import { API_BASE_PREFIX } from "$lib/utils";
 
-export const load: PageServerLoad = async ({ params, fetch, cookies, url, parent }) => {
+export const load: PageServerLoad = async ({ params, fetch, cookies, url, parent, locals }) => {
   const searchQuery = url.searchParams.get("article_search_query");
   const sortBy = url.searchParams.get("article_sort");
+  const filterBy = url.searchParams.get("article_filter");
 
   const parameters = new URLSearchParams();
 
@@ -29,6 +30,15 @@ export const load: PageServerLoad = async ({ params, fetch, cookies, url, parent
       break;
   }
 
+  switch (filterBy) {
+    case "creations":
+      parameters.append("user_id", `eq.${locals.user.id}`);
+      break;
+    case "shared":
+      parameters.append("user_id", `not.eq.${locals.user.id}`);
+      break;
+  }
+
   const constructedFetchUrl = `${baseFetchUrl}&${parameters.toString()}`;
 
   const totalArticlesData = await fetch(baseFetchUrl, {
diff --git a/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.svelte b/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.svelte
index 8be8554..a0bb03e 100644
--- a/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.svelte
+++ b/web-app/src/routes/(authenticated)/website/[websiteId]/articles/+page.svelte
@@ -66,6 +66,14 @@
             {/each}
           </select>
         </label>
+        <label>
+          Filter:
+          <select name="article_filter">
+            <option value="all">Show all</option>
+            <option value="creations">Created by you</option>
+            <option value="shared">Created by others</option>
+          </select>
+        </label>
         <button type="submit">Submit</button>
       </form>
 
@@ -109,19 +117,24 @@
   .article-card {
     display: flex;
     align-items: center;
-    column-gap: 2rem;
-    row-gap: 0.5rem;
+    column-gap: var(--space-s);
+    row-gap: var(--space-2xs);
     flex-wrap: wrap;
     justify-content: space-between;
   }
 
+  .article-card + .article-card {
+    padding-block-start: var(--space-s);
+    border-block-start: var(--border-primary);
+  }
+
   .article-card:nth-of-type(1) {
-    margin-block-start: 1rem;
+    margin-block-start: var(--space-m);
   }
 
   .article-card__actions {
     display: flex;
-    gap: 1rem;
+    gap: var(--space-s);
     align-items: center;
   }
 </style>
diff --git a/web-app/src/routes/(authenticated)/website/[websiteId]/collaborators/+page.svelte b/web-app/src/routes/(authenticated)/website/[websiteId]/collaborators/+page.svelte
index 04e7420..bdeaee5 100644
--- a/web-app/src/routes/(authenticated)/website/[websiteId]/collaborators/+page.svelte
+++ b/web-app/src/routes/(authenticated)/website/[websiteId]/collaborators/+page.svelte
@@ -117,19 +117,24 @@
   .collaborator-card {
     display: flex;
     align-items: center;
-    column-gap: 2rem;
-    row-gap: 0.5rem;
+    column-gap: var(--space-s);
+    row-gap: var(--space-2xs);
     flex-wrap: wrap;
     justify-content: space-between;
   }
 
+  .collaborator-card + .collaborator-card {
+    padding-block-start: var(--space-s);
+    border-block-start: var(--border-primary);
+  }
+
   .collaborator-card:nth-of-type(1) {
-    margin-block-start: 1rem;
+    margin-block-start: var(--space-xs);
   }
 
   .collaborator-card__actions {
     display: flex;
-    gap: 0.5rem;
+    gap: var(--space-2xs);
     align-items: center;
   }
 </style>
diff --git a/web-app/src/routes/+layout.svelte b/web-app/src/routes/+layout.svelte
index c0b2f62..df24635 100644
--- a/web-app/src/routes/+layout.svelte
+++ b/web-app/src/routes/+layout.svelte
@@ -3,7 +3,6 @@
   import { page } from "$app/stores";
   import type { LayoutServerData } from "./$types";
   import type { Snippet } from "svelte";
-  import { dev } from "$app/environment";
 
   const { data, children } = $props<{ data: LayoutServerData; children: Snippet }>();
 
@@ -17,13 +16,23 @@
 
 <nav>
   <strong>archtika</strong>
-  {#if data.user}
-    <a href="/">Dashboard</a>
-    <a href="/account">Account</a>
-  {:else}
-    <a href="/register">Register</a>
-    <a href="/login">Login</a>
-  {/if}
+  <ul class="link-wrapper">
+    {#if data.user}
+      <li>
+        <a href="/">Dashboard</a>
+      </li>
+      <li>
+        <a href="/account">Account</a>
+      </li>
+    {:else}
+      <li>
+        <a href="/register">Register</a>
+      </li>
+      <li>
+        <a href="/login">Login</a>
+      </li>
+    {/if}
+  </ul>
 </nav>
 
 {#if !isProjectRoute}
@@ -38,7 +47,9 @@
 
 <footer>
   <p>
-    <small>archtika is a free, open, modern, performant and lightweight CMS</small>
+    <small
+      >&copy; {new Date().getFullYear()} &mdash; <a href="https://archtika.com">archtika</a></small
+    >
   </p>
 </footer>
 
@@ -47,20 +58,24 @@
   header,
   main,
   footer {
-    padding-block: 1rem;
-    inline-size: min(100% - 2rem, 1024px);
+    padding-block: var(--space-s);
+    inline-size: min(100% - var(--space-m), 1024px);
     margin-inline: auto;
   }
 
   nav {
     display: flex;
     align-items: center;
-    gap: 1rem;
-    overflow-x: auto;
+    column-gap: var(--space-m);
+    row-gap: var(--space-3xs);
+    flex-wrap: wrap;
+    justify-content: space-between;
   }
 
-  nav > *:first-child {
-    margin-inline-end: auto;
+  nav > .link-wrapper {
+    display: flex;
+    align-items: center;
+    gap: var(--space-s);
   }
 
   footer {
@@ -69,11 +84,17 @@
   }
 
   .editor {
-    inline-size: min(100% - 2rem, 1536px);
-    block-size: calc(100vh - 7rem);
-    border-block-start: var(--border-primary);
     display: grid;
-    grid-template-columns: 1fr 1fr;
+    block-size: calc(100vh - (4 * var(--space-s) + 2 * 1.5rem));
+    inline-size: min(100% - var(--space-m), 1536px);
+    border-block-start: var(--border-primary);
     padding-block: 0;
+    position: relative;
+  }
+
+  @media (min-width: 640px) {
+    .editor {
+      grid-template-columns: 1fr 1fr;
+    }
   }
 </style>