feat(navbar): add modular navbar components and color variables

apps/web/src/components/navbar/NavAuth.tsx

@@ -0,0 +1,40 @@
+import { Link, useNavigate } from "@tanstack/react-router";
+import { useSession, signOut } from "../../lib/auth-client";
+
+const NavAuth = () => {
+  const { data: session } = useSession();
+  const navigate = useNavigate();
+
+  const handleSignOut = () => {
+    void signOut()
+      .then(() => void navigate({ to: "/" }))
+      .catch((err) => console.error("Sign out error:", err));
+  };
+
+  return (
+    <div className="ml-auto">
+      {session ? (
+        <button
+          onClick={handleSignOut}
+          className="text-sm text-(--color-text-muted) transition-colors duration-200
+            hover:text-(--color-primary)"
+        >
+          Sign out{" "}
+          <span className="text-(--color-accent)">{session.user.name}</span>
+        </button>
+      ) : (
+        <Link
+          to="/login"
+          className="text-sm font-medium px-4 py-1.5 rounded-full
+            text-white bg-(--color-primary)
+            hover:bg-(--color-primary-dark)
+            transition-colors duration-200"
+        >
+          Sign in
+        </Link>
+      )}
+    </div>
+  );
+};
+
+export default NavAuth;

apps/web/src/components/navbar/NavBar.tsx

@@ -0,0 +1,18 @@
+import NavAuth from "./NavAuth";
+import NavLinks from "./NavLinks";
+
+const Navbar = () => {
+  return (
+    <header className="sticky top-0 z-50 w-full bg-(--color-surface) border-b border-(--color-primary-light)">
+      <div className="max-w-5xl mx-auto px-6 h-14 flex items-center gap-8">
+        <span className="text-sm font-bold tracking-tight text-(--color-primary)">
+          lila
+        </span>
+        <NavLinks />
+        <NavAuth />
+      </div>
+    </header>
+  );
+};
+
+export default Navbar;

apps/web/src/components/navbar/NavLink.tsx

@@ -0,0 +1,26 @@
+import { Link } from "@tanstack/react-router";
+
+type NavLinkProps = { to: string; children: React.ReactNode };
+
+const NavLink = ({ to, children }: NavLinkProps) => {
+  return (
+    <Link
+      to={to}
+      className="relative text-sm font-medium text-(--color-text-muted) transition-colors duration-200
+        hover:text-(--color-primary)
+        [&.active]:text-(--color-primary)
+        [&.active]:after:absolute
+        [&.active]:after:-bottom-1
+        [&.active]:after:left-0
+        [&.active]:after:w-full
+        [&.active]:after:h-0.5
+        [&.active]:after:bg-(--color-accent)
+        [&.active]:after:rounded-full
+        [&.active]:after:content-['']"
+    >
+      {children}
+    </Link>
+  );
+};
+
+export default NavLink;

apps/web/src/components/navbar/NavLinks.tsx

@@ -0,0 +1,21 @@
+import NavLink from "./NavLink";
+
+const links = [
+  { to: "/", label: "Home" },
+  { to: "/play", label: "Play" },
+  { to: "/multiplayer", label: "Multiplayer" },
+];
+
+const NavLinks = () => {
+  return (
+    <nav className="flex items-center gap-6">
+      {links.map(({ to, label }) => (
+        <NavLink key={to} to={to}>
+          {label}
+        </NavLink>
+      ))}
+    </nav>
+  );
+};
+
+export default NavLinks;

apps/web/src/components/navbar/NavLogin.tsx

@@ -0,0 +1,17 @@
+import { Link } from "@tanstack/react-router";
+
+const NavLogin = () => {
+  return (
+    <Link
+      to="/login"
+      className="text-sm font-medium px-4 py-1.5 rounded-full
+        text-white bg-(--color-primary)
+        hover:bg-(--color-primary-dark)
+        transition-colors duration-200"
+    >
+      Sign in
+    </Link>
+  );
+};
+
+export default NavLogin;

apps/web/src/components/navbar/NavLogout.tsx

@@ -0,0 +1,26 @@
+import { useNavigate } from "@tanstack/react-router";
+import { signOut } from "../../lib/auth-client";
+
+type NavLogoutProps = { name: string };
+
+const NavLogout = ({ name }: NavLogoutProps) => {
+  const navigate = useNavigate();
+
+  const handleLogout = () => {
+    void signOut()
+      .then(() => void navigate({ to: "/" }))
+      .catch((err) => console.error("logout error:", err));
+  };
+
+  return (
+    <button
+      onClick={handleLogout}
+      className="text-sm text-(--color-text-muted) transition-colors duration-200
+        hover:text-(--color-primary)"
+    >
+      logout <span className="text-(--color-accent)">{name}</span>
+    </button>
+  );
+};
+
+export default NavLogout;

apps/web/src/routes/__root.tsx

@@ -1,56 +1,14 @@
-import {
-  createRootRoute,
-  Link,
-  Outlet,
-  useNavigate,
-} from "@tanstack/react-router";
+import { createRootRoute, Outlet } from "@tanstack/react-router";
 import { TanStackRouterDevtools } from "@tanstack/react-router-devtools";
-import { useSession, signOut } from "../lib/auth-client";
+import Navbar from "../components/navbar/NavBar";
 
 const RootLayout = () => {
-  const { data: session } = useSession();
-  const navigate = useNavigate();
-
   return (
     <>
-      <div className="p-2 flex gap-2 items-center">
-        <Link to="/" className="[&.active]:font-bold">
-          Home
-        </Link>
-        <Link to="/play" className="[&.active]:font-bold">
-          Play
-        </Link>
-        <Link to="/multiplayer" className="[&.active]:font-bold">
-          Multiplayer
-        </Link>
-        <div className="ml-auto">
-          {session ? (
-            <button
-              className="text-sm text-gray-600 hover:text-gray-900"
-              onClick={() => {
-                void signOut()
-                  .then(() => {
-                    void navigate({ to: "/" });
-                  })
-                  .catch((err) => {
-                    console.error("Sign out error:", err);
-                  });
-              }}
-            >
-              Sign out ({session.user.name})
-            </button>
-          ) : (
-            <Link
-              to="/login"
-              className="text-sm text-blue-600 hover:text-blue-800"
-            >
-              Sign in
-            </Link>
-          )}
-        </div>
-      </div>
-      <hr />
+      <Navbar />
+      <main className="max-w-5xl mx-auto px-6 py-8">
         <Outlet />
+      </main>
       <TanStackRouterDevtools />
     </>
   );