From f40ace64a828dbb4cf74f2d4710136e1f1dadded Mon Sep 17 00:00:00 2001
From: Petr <opensource@petrbalvin.org>
Date: Sun, 12 Jul 2026 11:12:37 +0200
Subject: [PATCH] feat(settings): add user profile photo upload and tabbed
 layout

---
 lib/volumen/admin_routes.rb        |  12 +
 lib/volumen/server.rb              |  21 ++
 lib/volumen/store.rb               |  11 +-
 lib/volumen/users.rb               |  13 +-
 lib/volumen/web/views/layout.erb   | 122 +++++++++-
 lib/volumen/web/views/settings.erb | 356 ++++++++++++++++++-----------
 6 files changed, 384 insertions(+), 151 deletions(-)

diff --git a/lib/volumen/admin_routes.rb b/lib/volumen/admin_routes.rb
index 7ae8d3b..272c2a2 100644
--- a/lib/volumen/admin_routes.rb
+++ b/lib/volumen/admin_routes.rb
@@ -139,6 +139,18 @@ module Volumen
         change_fediverse_creator
       end
 
+      app.post "/admin/settings/photo" do
+        require_login!
+        check_csrf!
+        change_photo
+      end
+
+      app.post "/admin/settings/photo/remove" do
+        require_login!
+        check_csrf!
+        remove_photo
+      end
+
       app.post "/admin/settings/users" do
         require_login!
         require_admin!
diff --git a/lib/volumen/server.rb b/lib/volumen/server.rb
index 58f9efd..15c9632 100644
--- a/lib/volumen/server.rb
+++ b/lib/volumen/server.rb
@@ -207,6 +207,10 @@ module Volumen
       current_user_record&.fediverse_creator
     end
 
+    def current_user_photo
+      current_user_record&.photo
+    end
+
     def admin?
       current_role == "admin"
     end
@@ -325,6 +329,23 @@ module Volumen
       render_settings(notice: "Fediverse handle updated.")
     end
 
+    def change_photo
+      upload = params["photo"]
+      unless upload.is_a?(Hash) && upload[:tempfile]
+        return render_settings(error: "No file selected.")
+      end
+
+      validate_upload!(upload)
+      url = store.store_user_photo(current_user, upload[:filename], upload[:tempfile])
+      users.update_photo(current_user, url)
+      render_settings(notice: "Profile photo updated.")
+    end
+
+    def remove_photo
+      users.update_photo(current_user, nil)
+      render_settings(notice: "Profile photo removed.")
+    end
+
     def create_user
       name = presence(params["username"])
       password = presence(params["password"])
diff --git a/lib/volumen/store.rb b/lib/volumen/store.rb
index 1ba6595..8a9bd19 100644
--- a/lib/volumen/store.rb
+++ b/lib/volumen/store.rb
@@ -61,8 +61,17 @@ module Volumen
     end
 
     def store_upload(original_name, source)
-      FileUtils.mkdir_p(media_dir)
       name = safe_media_name(original_name)
+      FileUtils.mkdir_p(media_dir)
+      File.open(File.join(media_dir, name), "wb") { |file| IO.copy_stream(source, file) }
+      "/media/#{name}"
+    end
+
+    def store_user_photo(username, original_name, source)
+      ext = File.extname(original_name.to_s).gsub(/[^a-zA-Z0-9.]/, "").downcase
+      ext = ".webp" if ext.empty?
+      name = "#{username}-#{SecureRandom.hex(4)}#{ext}"
+      FileUtils.mkdir_p(media_dir)
       File.open(File.join(media_dir, name), "wb") { |file| IO.copy_stream(source, file) }
       "/media/#{name}"
     end
diff --git a/lib/volumen/users.rb b/lib/volumen/users.rb
index c4f8551..4e3bfde 100644
--- a/lib/volumen/users.rb
+++ b/lib/volumen/users.rb
@@ -15,7 +15,7 @@ module Volumen
     ROLES = %w[admin author].freeze
     DEFAULT_ROLE = "author"
 
-    User = Struct.new(:username, :password_hash, :role, :name, :fediverse_creator)
+    User = Struct.new(:username, :password_hash, :role, :name, :fediverse_creator, :photo)
 
     def initialize(path:, bootstrap_hash: nil)
       @path = path
@@ -33,7 +33,7 @@ module Volumen
         elsif @bootstrap_hash.empty?
           []
         else
-          [User.new("admin", @bootstrap_hash, "admin", nil, nil)]
+          [User.new("admin", @bootstrap_hash, "admin", nil, nil, nil)]
         end
       end
     end
@@ -54,7 +54,7 @@ module Volumen
     def add(username, password, role = DEFAULT_ROLE)
       return nil if username.to_s.empty? || find(username)
 
-      user = User.new(username, Password.hash(password), normalize_role(role), nil, nil)
+      user = User.new(username, Password.hash(password), normalize_role(role), nil, nil, nil)
       persist(all + [user])
       user
     end
@@ -69,6 +69,10 @@ module Volumen
       end
     end
 
+    def update_photo(username, path)
+      mutate(username) { |user| user.photo = path }
+    end
+
     def update_password(username, password)
       mutate(username) { |user| user.password_hash = Password.hash(password) }
     end
@@ -132,7 +136,7 @@ module Volumen
       data = TomlRB.load_file(@path)
       Array(data["users"]).map do |entry|
         User.new(entry["username"], entry["password_hash"], entry["role"] || "admin",
-                 entry["name"], entry["fediverse_creator"])
+                 entry["name"], entry["fediverse_creator"], entry["photo"])
       end
     end
 
@@ -151,6 +155,7 @@ module Volumen
       }
       hash["name"] = user.name if user.name
       hash["fediverse_creator"] = user.fediverse_creator if user.fediverse_creator
+      hash["photo"] = user.photo if user.photo
       hash
     end
   end
diff --git a/lib/volumen/web/views/layout.erb b/lib/volumen/web/views/layout.erb
index eb117f7..48d06b0 100644
--- a/lib/volumen/web/views/layout.erb
+++ b/lib/volumen/web/views/layout.erb
@@ -102,6 +102,11 @@
         display: grid; place-items: center; font-weight: 600; font-size: 0.78rem;
         flex-shrink: 0;
       }
+      .avatar-img {
+        background: var(--surface-2);
+        object-fit: cover;
+        padding: 0;
+      }
       .user-info { flex: 1; min-width: 0; }
       .user-info .name { font-size: 0.82rem; font-weight: 600; color: var(--fg);
         overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@@ -360,17 +365,114 @@
       .data-table tr:last-child td { border-bottom: none; }
 
       /* --- Settings --- */
+      .settings-layout {
+        display: grid;
+        grid-template-columns: 220px 1fr;
+        gap: 1.5rem;
+        align-items: start;
+      }
       .settings-nav {
-        display: flex; gap: 0.4rem; margin-bottom: 1.25rem;
-        border-bottom: 1px solid var(--border); padding-bottom: 0;
+        display: flex; flex-direction: column; gap: 0.15rem;
+        position: sticky; top: 5rem;
+        padding: 0.4rem;
+        background: var(--surface);
+        border: 1px solid var(--border);
+        border-radius: var(--radius);
       }
       .settings-nav a {
-        padding: 0.55rem 0.9rem; color: var(--fg-muted); text-decoration: none;
-        font-size: 0.85rem; font-weight: 550; border-bottom: 2px solid transparent;
-        margin-bottom: -1px;
+        display: flex; align-items: center; gap: 0.6rem;
+        padding: 0.55rem 0.75rem;
+        font-size: 0.85rem; font-weight: 550;
+        color: var(--fg-muted);
+        text-decoration: none;
+        border-radius: var(--radius-sm);
+        transition: background 0.12s, color 0.12s;
+      }
+      .settings-nav a:hover { background: var(--surface-2); color: var(--fg); }
+      .settings-nav a.active { background: var(--accent-soft); color: var(--accent); }
+      .settings-nav a svg { width: 16px; height: 16px; flex-shrink: 0; }
+      .settings-panels { display: flex; flex-direction: column; gap: 1.25rem; min-width: 0; }
+      .settings-panels .surface { padding: 0; overflow: hidden; }
+      .settings-panels .surface-head {
+        padding: 1.5rem 1.75rem 1.25rem;
+        margin-bottom: 0;
+        border-bottom: 1px solid var(--border);
+      }
+      .settings-section {
+        display: flex; gap: 1.25rem;
+        padding: 1.5rem 1.75rem;
+        border-top: 1px solid var(--border);
+      }
+      .settings-section:first-of-type { border-top: none; }
+      .settings-section-icon {
+        width: 40px; height: 40px; flex-shrink: 0;
+        background: var(--accent-soft); color: var(--accent);
+        border-radius: 10px;
+        display: grid; place-items: center;
+      }
+      .settings-section-icon svg { width: 20px; height: 20px; }
+      .settings-section-body { flex: 1; min-width: 0; }
+      .settings-section-body h3 { font-size: 0.95rem; font-weight: 600; margin: 0 0 0.2rem; }
+      .settings-section-desc { font-size: 0.82rem; color: var(--fg-muted); margin: 0 0 1rem; line-height: 1.5; }
+      .settings-inline-form { display: flex; gap: 0.5rem; align-items: flex-end; flex-wrap: wrap; }
+      .settings-inline-form .field { flex: 1; min-width: 220px; margin-bottom: 0; }
+      .settings-inline-form .btn { margin-bottom: 1px; }
+
+      .settings-photo-form { margin-top: 0.5rem; }
+      .photo-input-row { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
+      .photo-preview {
+        width: 80px; height: 80px; border-radius: 50%; object-fit: cover;
+        border: 2px solid var(--border); flex-shrink: 0;
+      }
+      .photo-preview-placeholder {
+        background: var(--accent-soft); color: var(--accent);
+        display: grid; place-items: center; font-weight: 600; font-size: 1.75rem;
+      }
+      .photo-input-fields { flex: 1; min-width: 220px; }
+      .file-input {
+        font: inherit; color: var(--fg); padding: 0.5rem 0.75rem;
+        background: var(--surface); border: 1px solid var(--border);
+        border-radius: var(--radius); width: 100%; font-size: 0.85rem;
+      }
+      .photo-buttons { display: flex; gap: 0.5rem; margin-top: 0.6rem; }
+      .btn-danger { color: var(--danger); }
+
+      .users-list { padding: 0.5rem 0; }
+      .user-row {
+        display: flex; align-items: center; gap: 0.85rem;
+        padding: 0.85rem 1.75rem;
+        border-top: 1px solid var(--border);
+      }
+      .user-row:first-child { border-top: none; }
+      .user-avatar {
+        width: 36px; height: 36px; border-radius: 50%; object-fit: cover; flex-shrink: 0;
+      }
+      .user-avatar-placeholder {
+        background: var(--accent-soft); color: var(--accent);
+        display: grid; place-items: center; font-weight: 600; font-size: 0.9rem;
+      }
+      .user-info { flex: 1; min-width: 0; }
+      .user-name { font-weight: 600; font-size: 0.9rem; color: var(--fg); }
+      .user-username { font-size: 0.78rem; color: var(--fg-muted); font-family: var(--font-mono); }
+      .user-role { display: flex; align-items: center; }
+      .select-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; width: 110px; }
+
+      .add-user-form {
+        padding: 1.5rem 1.75rem;
+        border-top: 1px solid var(--border);
+        background: var(--surface-2);
+      }
+      .add-user-form h3 { color: var(--fg-muted); }
+
+      @media (max-width: 760px) {
+        .settings-layout { grid-template-columns: 1fr; }
+        .settings-nav { position: static; flex-direction: row; overflow-x: auto; }
+        .settings-nav a { white-space: nowrap; }
+        .settings-section { flex-direction: column; gap: 0.85rem; }
+        .settings-section-icon { width: 36px; height: 36px; }
+        .settings-section-icon svg { width: 18px; height: 18px; }
+        .photo-input-row { flex-direction: column; align-items: flex-start; }
       }
-      .settings-nav a:hover { color: var(--fg); }
-      .settings-nav a.active { color: var(--accent); border-bottom-color: var(--accent); }
 
       [hidden] { display: none !important; }
 
@@ -515,7 +617,11 @@
               </div>
             </nav>
             <div class="sidebar-foot">
-              <div class="avatar"><%= h((current_user_name || current_user).to_s[0].upcase) %></div>
+              <% if current_user_photo %>
+                <img class="avatar avatar-img" src="<%= h(current_user_photo) %>" alt="">
+              <% else %>
+                <div class="avatar"><%= h((current_user_name || current_user).to_s[0].upcase) %></div>
+              <% end %>
               <div class="user-info">
                 <div class="name"><%= h(current_user_name || current_user) %></div>
                 <div class="role"><%= h(current_role) %></div>
diff --git a/lib/volumen/web/views/settings.erb b/lib/volumen/web/views/settings.erb
index 56ab1c2..71f21f2 100644
--- a/lib/volumen/web/views/settings.erb
+++ b/lib/volumen/web/views/settings.erb
@@ -18,147 +18,227 @@
   </div>
 <% end %>
 
-<div class="surface">
-  <div class="surface-head">
-    <div>
-      <h2>Your account</h2>
-      <p class="lede">Signed in as <strong style="color: var(--fg);"><%= h(current_user) %></strong> · <%= h(current_role) %></p>
-    </div>
+<div class="settings-layout">
+  <nav class="settings-nav" aria-label="Settings sections">
+    <a href="#account" class="active">
+      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>
+      Account
+    </a>
+    <% if admin? %>
+      <a href="#users">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/><path d="M23 21v-2a4 4 0 0 0-3-3.87"/><path d="M16 3.13a4 4 0 0 1 0 7.75"/></svg>
+        Users
+      </a>
+    <% end %>
+  </nav>
+
+  <div class="settings-panels">
+    <section id="account" class="surface">
+      <div class="surface-head">
+        <div>
+          <h2>Account</h2>
+          <p class="lede">Signed in as <strong style="color: var(--fg);"><%= h(current_user) %></strong> · <%= h(current_role) %></p>
+        </div>
+      </div>
+
+      <div class="settings-section">
+        <div class="settings-section-icon">
+          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M19 21v-2a4 4 0 0 0-4-4H9a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/><path d="M12 11v6"/><path d="M9 14h6"/></svg>
+        </div>
+        <div class="settings-section-body">
+          <h3>Profile photo</h3>
+          <p class="settings-section-desc">WebP or AVIF, max 10 MB. Shown in the sidebar.</p>
+          <form method="post" action="<%= to("/admin/settings/photo") %>" enctype="multipart/form-data" class="settings-photo-form">
+            <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            <div class="photo-input-row">
+              <% if current_user_record&.photo %>
+                <img src="<%= h(current_user_record.photo) %>" alt="" class="photo-preview">
+              <% else %>
+                <div class="photo-preview photo-preview-placeholder"><%= h((current_user_record&.name || current_user).to_s[0].upcase) %></div>
+              <% end %>
+              <div class="photo-input-fields">
+                <input type="file" name="photo" accept="image/webp,image/avif" required class="file-input">
+                <div class="photo-buttons">
+                  <button type="submit" class="btn btn-primary">Upload</button>
+                  <% if current_user_record&.photo %>
+                    <button type="submit" form="remove-photo-form" class="btn btn-ghost btn-danger">Remove</button>
+                  <% end %>
+                </div>
+              </div>
+            </div>
+          </form>
+          <% if current_user_record&.photo %>
+            <form id="remove-photo-form" method="post" action="<%= to("/admin/settings/photo/remove") %>" style="display: none;">
+              <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            </form>
+          <% end %>
+        </div>
+      </div>
+
+      <div class="settings-section">
+        <div class="settings-section-icon">
+          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M4 7V4h16v3"/><path d="M9 20h6"/><path d="M12 4v16"/></svg>
+        </div>
+        <div class="settings-section-body">
+          <h3>Identity</h3>
+          <p class="settings-section-desc">Display name pre-fills the author field. Fediverse handle pre-fills the creator.</p>
+          <form method="post" action="<%= to("/admin/settings/name") %>" class="settings-inline-form">
+            <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            <div class="field">
+              <label for="name">Display name (real name)</label>
+              <input id="name" class="input" type="text" name="name" value="<%= h(current_user_record&.name) %>" placeholder="Your real name">
+            </div>
+            <button type="submit" class="btn">Save name</button>
+          </form>
+          <form method="post" action="<%= to("/admin/settings/fediverse") %>" class="settings-inline-form" style="margin-top: 1rem;">
+            <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            <div class="field">
+              <label for="fediverse_creator">Fediverse handle</label>
+              <input id="fediverse_creator" class="input" type="text" name="fediverse_creator" value="<%= h(current_user_record&.fediverse_creator) %>" placeholder="@user@instance.tld">
+            </div>
+            <button type="submit" class="btn">Save handle</button>
+          </form>
+        </div>
+      </div>
+
+      <div class="settings-section">
+        <div class="settings-section-icon">
+          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>
+        </div>
+        <div class="settings-section-body">
+          <h3>Security</h3>
+          <p class="settings-section-desc">Change your password and username. You can also lock yourself out.</p>
+          <form method="post" action="<%= to("/admin/settings/password") %>" class="settings-inline-form">
+            <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            <div class="field-row">
+              <div class="field">
+                <label for="current_password">Current password</label>
+                <input id="current_password" class="input" type="password" name="current_password" autocomplete="current-password">
+              </div>
+              <div class="field">
+                <label for="new_password">New password</label>
+                <input id="new_password" class="input" type="password" name="new_password" autocomplete="new-password">
+              </div>
+            </div>
+            <button type="submit" class="btn">Update password</button>
+          </form>
+          <form method="post" action="<%= to("/admin/settings/username") %>" class="settings-inline-form" style="margin-top: 1rem;">
+            <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            <div class="field">
+              <label for="username">Username</label>
+              <input id="username" class="input" type="text" name="username" value="<%= h(current_user) %>">
+            </div>
+            <button type="submit" class="btn">Update username</button>
+          </form>
+        </div>
+      </div>
+    </section>
+
+    <% if admin? %>
+          <section id="users" class="surface">
+            <div class="surface-head">
+              <div>
+                <h2>Users</h2>
+                <p class="lede">Add or remove admin and editor accounts</p>
+              </div>
+            </div>
+
+        <div class="users-list">
+          <% @users.each do |user| %>
+            <div class="user-row">
+              <% if user.photo %>
+                <img src="<%= h(user.photo) %>" alt="" class="user-avatar">
+              <% else %>
+                <div class="user-avatar user-avatar-placeholder"><%= h((user.name || user.username).to_s[0].upcase) %></div>
+              <% end %>
+              <div class="user-info">
+                <div class="user-name">
+                  <%= h(user.name || user.username) %>
+                  <% if user.username == current_user %><span class="badge badge-accent" style="margin-left: 0.4rem;">you</span><% end %>
+                </div>
+                <div class="user-username">@<%= h(user.username) %></div>
+              </div>
+              <div class="user-role">
+                <% if user.username == current_user %>
+                  <span class="badge badge-neutral"><%= h(user.role) %></span>
+                <% else %>
+                  <form method="post" action="<%= h(to("/admin/settings/users/#{user.username}/role")) %>" style="margin: 0;">
+                    <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+                    <select class="select select-sm" name="role" onchange="this.form.submit()">
+                      <% Volumen::Users::ROLES.each do |role| %>
+                        <option value="<%= role %>" <%= user.role == role ? "selected" : "" %>><%= role %></option>
+                      <% end %>
+                    </select>
+                  </form>
+                <% end %>
+              </div>
+              <% unless user.username == current_user %>
+                <form method="post" action="<%= h(to("/admin/settings/users/#{user.username}/delete")) %>" onsubmit="return confirm('Remove this user?');" style="margin: 0;">
+                  <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+                  <button type="submit" class="btn btn-sm btn-ghost btn-danger">Remove</button>
+                </form>
+              <% end %>
+            </div>
+          <% end %>
+        </div>
+
+        <div class="add-user-form">
+          <h3 style="margin: 0 0 0.75rem;">Add user</h3>
+          <form method="post" action="<%= to("/admin/settings/users") %>">
+            <input type="hidden" name="_csrf" value="<%= csrf_token %>">
+            <div class="field-row-3">
+              <div class="field">
+                <label for="new-username">Username</label>
+                <input id="new-username" class="input" type="text" name="username" placeholder="jane-doe">
+              </div>
+              <div class="field">
+                <label for="new-password">Password</label>
+                <input id="new-password" class="input" type="password" name="password" autocomplete="new-password">
+              </div>
+              <div class="field">
+                <label for="new-role">Role</label>
+                <select id="new-role" class="select" name="role">
+                  <% Volumen::Users::ROLES.each do |role| %>
+                    <option value="<%= role %>" <%= role == Volumen::Users::DEFAULT_ROLE ? "selected" : "" %>><%= role %></option>
+                  <% end %>
+                </select>
+              </div>
+            </div>
+            <button type="submit" class="btn btn-primary">Add user</button>
+          </form>
+        </div>
+      </section>
+    <% end %>
   </div>
-
-  <form method="post" action="<%= to("/admin/settings/password") %>">
-    <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-    <h3 style="margin: 0 0 0.75rem;">Change password</h3>
-    <div class="field-row">
-      <div class="field">
-        <label for="current_password">Current password</label>
-        <input id="current_password" class="input" type="password" name="current_password" autocomplete="current-password">
-      </div>
-      <div class="field">
-        <label for="new_password">New password</label>
-        <input id="new_password" class="input" type="password" name="new_password" autocomplete="new-password">
-      </div>
-    </div>
-    <button type="submit" class="btn btn-primary">Update password</button>
-  </form>
-
-  <div style="border-top: 1px solid var(--border); margin: 1.5rem 0;"></div>
-
-  <form method="post" action="<%= to("/admin/settings/name") %>">
-    <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-    <h3 style="margin: 0 0 0.75rem;">Display name</h3>
-    <div class="field">
-      <label for="name">Real name</label>
-      <input id="name" class="input" type="text" name="name" value="<%= h(current_user_record&.name) %>" placeholder="Your real name" style="max-width: 360px;">
-      <p class="help">Used to pre-fill the author field for new posts. Leave empty to use your username.</p>
-    </div>
-    <button type="submit" class="btn">Save name</button>
-  </form>
-
-  <div style="border-top: 1px solid var(--border); margin: 1.5rem 0;"></div>
-
-  <form method="post" action="<%= to("/admin/settings/fediverse") %>">
-    <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-    <h3 style="margin: 0 0 0.75rem;">Fediverse handle</h3>
-    <div class="field">
-      <label for="fediverse_creator">Fediverse creator</label>
-      <input id="fediverse_creator" class="input" type="text" name="fediverse_creator"
-             value="<%= h(current_user_record&.fediverse_creator) %>"
-             placeholder="@user@instance.tld" style="max-width: 360px;">
-      <p class="help">Used to pre-fill the Fediverse creator for new posts.</p>
-    </div>
-    <button type="submit" class="btn">Save handle</button>
-  </form>
-
-  <div style="border-top: 1px solid var(--border); margin: 1.5rem 0;"></div>
-
-  <form method="post" action="<%= to("/admin/settings/username") %>">
-    <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-    <h3 style="margin: 0 0 0.75rem;">Change username</h3>
-    <div class="field">
-      <label for="username">New username</label>
-      <input id="username" class="input" type="text" name="username" value="<%= h(current_user) %>" style="max-width: 360px;">
-    </div>
-    <button type="submit" class="btn">Update username</button>
-  </form>
 </div>
 
-<% if admin? %>
-  <div class="surface">
-    <div class="surface-head">
-      <div>
-        <h2>Users</h2>
-        <p class="lede">Add or remove admin and editor accounts</p>
-      </div>
-    </div>
+<script>
+  (function () {
+    var sections = document.querySelectorAll(".settings-panels .surface[id]");
+    var navLinks = document.querySelectorAll(".settings-nav a[href^='#']");
+    if (!sections.length || !navLinks.length) return;
 
-    <table class="data-table">
-      <thead>
-        <tr><th>Username</th><th>Role</th><th></th></tr>
-      </thead>
-      <tbody>
-        <% @users.each do |user| %>
-          <tr>
-            <td>
-              <strong><%= h(user.username) %></strong>
-              <% if user.username == current_user %><span class="badge badge-accent" style="margin-left: 0.4rem;">you</span><% end %>
-            </td>
-            <td>
-              <% if user.username == current_user %>
-                <span class="badge badge-neutral"><%= h(user.role) %></span>
-              <% else %>
-                <form method="post"
-                      action="<%= h(to("/admin/settings/users/#{user.username}/role")) %>"
-                      style="margin: 0;">
-                  <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-                  <select class="select" name="role" onchange="this.form.submit()" style="width: 130px; padding: 0.35rem 0.6rem; font-size: 0.82rem;">
-                    <% Volumen::Users::ROLES.each do |role| %>
-                      <option value="<%= role %>" <%= user.role == role ? "selected" : "" %>><%= role %></option>
-                    <% end %>
-                  </select>
-                </form>
-              <% end %>
-            </td>
-            <td>
-              <% unless user.username == current_user %>
-                <form method="post"
-                      action="<%= h(to("/admin/settings/users/#{user.username}/delete")) %>"
-                      onsubmit="return confirm('Remove this user?');"
-                      style="margin: 0;">
-                  <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-                  <button type="submit" class="btn btn-sm btn-danger">Remove</button>
-                </form>
-              <% end %>
-            </td>
-          </tr>
-        <% end %>
-      </tbody>
-    </table>
+    function showSection(id) {
+      sections.forEach(function (s) {
+        s.hidden = s.id !== id;
+      });
+      navLinks.forEach(function (a) {
+        a.classList.toggle("active", a.getAttribute("href") === "#" + id);
+      });
+      try { history.replaceState(null, "", "#" + id); } catch (e) {}
+      window.scrollTo({ top: 0, behavior: "smooth" });
+    }
 
-    <div style="border-top: 1px solid var(--border); margin: 1.5rem 0;"></div>
+    navLinks.forEach(function (link) {
+      link.addEventListener("click", function (event) {
+        event.preventDefault();
+        var id = link.getAttribute("href").slice(1);
+        showSection(id);
+      });
+    });
 
-    <form method="post" action="<%= to("/admin/settings/users") %>">
-      <input type="hidden" name="_csrf" value="<%= csrf_token %>">
-      <h3 style="margin: 0 0 0.75rem;">Add user</h3>
-      <div class="field-row-3">
-        <div class="field">
-          <label for="new-username">Username</label>
-          <input id="new-username" class="input" type="text" name="username">
-        </div>
-        <div class="field">
-          <label for="new-password">Password</label>
-          <input id="new-password" class="input" type="password" name="password" autocomplete="new-password">
-        </div>
-        <div class="field">
-          <label for="new-role">Role</label>
-          <select id="new-role" class="select" name="role">
-            <% Volumen::Users::ROLES.each do |role| %>
-              <option value="<%= role %>" <%= role == Volumen::Users::DEFAULT_ROLE ? "selected" : "" %>><%= role %></option>
-            <% end %>
-          </select>
-        </div>
-      </div>
-      <button type="submit" class="btn btn-primary">Add user</button>
-    </form>
-  </div>
-<% end %>
+    var initial = (window.location.hash || "").slice(1);
+    var hasInitial = Array.from(sections).some(function (s) { return s.id === initial; });
+    showSection(hasInitial ? initial : sections[0].id);
+  })();
+</script>