diff --git a/extensions/index.html b/extensions/index.html
index d54a7d3..6b54af3 100644
--- a/extensions/index.html
+++ b/extensions/index.html
@@ -23,25 +23,28 @@
        color:var(--ink);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh}
   a{color:var(--acid)}
   .wrap{max-width:900px;margin:0 auto;padding:0 1.2rem}
-  .topnav{position:sticky;top:0;z-index:20;display:flex;gap:2px;align-items:center;flex-wrap:wrap;
-       padding:10px 1.2rem;background:rgba(11,14,20,.82);backdrop-filter:blur(10px);
+  .topnav{position:fixed;top:0;left:0;right:0;z-index:20;display:flex;gap:2px;align-items:center;flex-wrap:wrap;
+       padding:10px 1.2rem;background:rgba(11,14,20,.88);backdrop-filter:blur(10px);
        border-bottom:1px solid var(--line)}
   .topnav .brand{font-weight:600;color:var(--ink);text-decoration:none;margin-right:14px;font-size:15px;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
   .topnav .brand .g{color:var(--acid)}
   .topnav .brand svg{width:20px;height:20px}
-  .topnav a{color:var(--mut);text-decoration:none;padding:6px 12px;border-radius:8px;font-size:14px}
+  .topnav a{color:var(--mut);text-decoration:none;padding:6px 12px;border-radius:8px;font-size:14px;
+       display:inline-flex;align-items:center;gap:6px}
   .topnav a:hover{color:var(--ink);background:var(--panel)}
   .topnav a.here{color:var(--acid);background:rgba(214,255,61,.08)}
+  .topnav a .g{color:var(--acid)}
+  .topnav a svg.tabicon{width:15px;height:15px;flex:none}
   .topnav a.get{margin-left:auto;background:rgba(214,255,61,.10);color:var(--acid);font-weight:500}
   .topnav a.get:hover{background:rgba(214,255,61,.18)}
 
   /* Adaptive edge nav: full-width panel at left edge on wide,
      icon rail on medium, bottom bar with icons on mobile. */
-  :root{--sn-w:220px}
-  body{padding-left:var(--sn-w)}
-  .sidenav{position:fixed;top:0;left:0;bottom:0;width:var(--sn-w);z-index:15;
+  :root{--sn-w:220px;--tn-h:52px}
+  body{padding-left:var(--sn-w);padding-top:var(--tn-h)}
+  .sidenav{position:fixed;top:var(--tn-h);left:0;bottom:0;width:var(--sn-w);z-index:15;
        background:rgba(11,14,20,.82);backdrop-filter:blur(10px);
-       border-right:1px solid var(--line);padding:74px 14px 22px 18px;
+       border-right:1px solid var(--line);padding:22px 14px 22px 18px;
        overflow-y:auto;transition:width .15s ease}
   .sidenav .lbl{color:var(--dim);font:600 10.5px/1 system-ui;letter-spacing:.24em;text-transform:uppercase;
        margin:0 0 14px 4px}
@@ -55,7 +58,7 @@
   .sidenav a.active{color:var(--acid);border-left-color:var(--acid);background:rgba(214,255,61,.07)}
   @media (max-width:1180px){
     :root{--sn-w:64px}
-    .sidenav{padding:74px 6px 22px 6px}
+    .sidenav{padding:22px 6px}
     .sidenav .lbl{display:none}
     .sidenav a{justify-content:center;padding:12px 4px;gap:0}
     .sidenav a .lb{display:none}
@@ -124,7 +127,7 @@
   <a href="/">Home</a>
   <a href="/plug-ins/">Plug-ins</a>
   <a class="here" href="./">Extensions</a>
-  <a href="https://sirius.x/" title="Register a BCNR name">sirius.x</a>
+  <a href="https://sirius.x/" title="Register a BCNR name"><svg class="tabicon" viewBox="0 0 64 64" aria-hidden="true"><rect width="64" height="64" rx="12" fill="#0b0e14"/><path d="M32 4 L36.4 27.6 L60 32 L36.4 36.4 L32 60 L27.6 36.4 L4 32 L27.6 27.6 Z" fill="#d6ff3d"/></svg>Sirius<span class="g">.X</span></a>
   <a class="get" href="/#download">Get Theseus</a>
 </nav>
 
diff --git a/index.html b/index.html
index f66eb5e..0a009ab 100644
--- a/index.html
+++ b/index.html
@@ -28,27 +28,30 @@
        color:var(--ink);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh}
   a{color:var(--acid)}
   .wrap{max-width:980px;margin:0 auto;padding:0 1.2rem}
-  .topnav{position:sticky;top:0;z-index:20;display:flex;gap:2px;align-items:center;flex-wrap:wrap;
-       padding:10px 1.2rem;background:rgba(11,14,20,.82);backdrop-filter:blur(10px);
+  .topnav{position:fixed;top:0;left:0;right:0;z-index:20;display:flex;gap:2px;align-items:center;flex-wrap:wrap;
+       padding:10px 1.2rem;background:rgba(11,14,20,.88);backdrop-filter:blur(10px);
        border-bottom:1px solid var(--line)}
   .topnav .brand{font-weight:600;color:var(--ink);text-decoration:none;margin-right:14px;font-size:15px;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
   .topnav .brand .g{color:var(--acid)}
   .topnav .brand svg{width:20px;height:20px}
-  .topnav a{color:var(--mut);text-decoration:none;padding:6px 12px;border-radius:8px;font-size:14px}
+  .topnav a{color:var(--mut);text-decoration:none;padding:6px 12px;border-radius:8px;font-size:14px;
+       display:inline-flex;align-items:center;gap:6px}
   .topnav a:hover{color:var(--ink);background:var(--panel)}
   .topnav a.here{color:var(--acid);background:rgba(214,255,61,.08)}
   .topnav a.get{margin-left:auto;background:rgba(214,255,61,.10);color:var(--acid);font-weight:500}
   .topnav a.get:hover{background:rgba(214,255,61,.18)}
+  .topnav a .g{color:var(--acid)}
+  .topnav a svg.tabicon{width:15px;height:15px;flex:none}
 
   /* Adaptive edge nav: full-width panel at left edge on wide,
      icon rail on medium, bottom bar with icons on mobile.
-     body padding-left carves the space so topnav + content flow as one column
-     beside the sidebar. */
-  :root{--sn-w:220px}
-  body{padding-left:var(--sn-w)}
-  .sidenav{position:fixed;top:0;left:0;bottom:0;width:var(--sn-w);z-index:15;
+     Topnav is fixed at the top spanning the full width; sidebar starts
+     just below it and content flows in the right column. */
+  :root{--sn-w:220px;--tn-h:52px}
+  body{padding-left:var(--sn-w);padding-top:var(--tn-h)}
+  .sidenav{position:fixed;top:var(--tn-h);left:0;bottom:0;width:var(--sn-w);z-index:15;
        background:rgba(11,14,20,.82);backdrop-filter:blur(10px);
-       border-right:1px solid var(--line);padding:74px 14px 22px 18px;
+       border-right:1px solid var(--line);padding:22px 14px 22px 18px;
        overflow-y:auto;transition:width .15s ease}
   .sidenav .lbl{color:var(--dim);font:600 10.5px/1 system-ui;letter-spacing:.24em;text-transform:uppercase;
        margin:0 0 14px 4px}
@@ -63,7 +66,7 @@
   /* Medium: shrink to an icon rail */
   @media (max-width:1180px){
     :root{--sn-w:64px}
-    .sidenav{padding:74px 6px 22px 6px}
+    .sidenav{padding:22px 6px}
     .sidenav .lbl{display:none}
     .sidenav a{justify-content:center;padding:12px 4px;gap:0}
     .sidenav a .lb{display:none}
@@ -145,7 +148,7 @@
   <a class="here" href="/">Home</a>
   <a href="/plug-ins/">Plug-ins</a>
   <a href="/extensions/">Extensions</a>
-  <a href="https://sirius.x/" title="Register a BCNR name">sirius.x</a>
+  <a href="https://sirius.x/" title="Register a BCNR name"><svg class="tabicon" viewBox="0 0 64 64" aria-hidden="true"><rect width="64" height="64" rx="12" fill="#0b0e14"/><path d="M32 4 L36.4 27.6 L60 32 L36.4 36.4 L32 60 L27.6 36.4 L4 32 L27.6 27.6 Z" fill="#d6ff3d"/></svg>Sirius<span class="g">.X</span></a>
   <a class="get" href="#download">Get Theseus</a>
 </nav>
 
diff --git a/plug-ins/index.html b/plug-ins/index.html
index d553e58..35ab320 100644
--- a/plug-ins/index.html
+++ b/plug-ins/index.html
@@ -22,24 +22,27 @@
        color:var(--ink);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh}
   a{color:var(--acid)}
   .wrap{max-width:900px;margin:0 auto;padding:0 1.2rem}
-  .topnav{position:sticky;top:0;z-index:20;display:flex;gap:2px;align-items:center;flex-wrap:wrap;
-       padding:10px 1.2rem;background:rgba(11,14,20,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
+  .topnav{position:fixed;top:0;left:0;right:0;z-index:20;display:flex;gap:2px;align-items:center;flex-wrap:wrap;
+       padding:10px 1.2rem;background:rgba(11,14,20,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
   .topnav .brand{font-weight:600;color:var(--ink);text-decoration:none;margin-right:14px;font-size:15px;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
   .topnav .brand .g{color:var(--acid)}
   .topnav .brand svg{width:20px;height:20px}
-  .topnav a{color:var(--mut);text-decoration:none;padding:6px 12px;border-radius:8px;font-size:14px}
+  .topnav a{color:var(--mut);text-decoration:none;padding:6px 12px;border-radius:8px;font-size:14px;
+       display:inline-flex;align-items:center;gap:6px}
   .topnav a:hover{color:var(--ink);background:var(--panel)}
   .topnav a.here{color:var(--acid);background:rgba(214,255,61,.08)}
+  .topnav a .g{color:var(--acid)}
+  .topnav a svg.tabicon{width:15px;height:15px;flex:none}
   .topnav a.get{margin-left:auto;background:rgba(214,255,61,.10);color:var(--acid);font-weight:500}
   .topnav a.get:hover{background:rgba(214,255,61,.18)}
 
   /* Adaptive edge nav: full-width panel at left edge on wide,
      icon rail on medium, bottom bar with icons on mobile. */
-  :root{--sn-w:220px}
-  body{padding-left:var(--sn-w)}
-  .sidenav{position:fixed;top:0;left:0;bottom:0;width:var(--sn-w);z-index:15;
+  :root{--sn-w:220px;--tn-h:52px}
+  body{padding-left:var(--sn-w);padding-top:var(--tn-h)}
+  .sidenav{position:fixed;top:var(--tn-h);left:0;bottom:0;width:var(--sn-w);z-index:15;
        background:rgba(11,14,20,.82);backdrop-filter:blur(10px);
-       border-right:1px solid var(--line);padding:74px 14px 22px 18px;
+       border-right:1px solid var(--line);padding:22px 14px 22px 18px;
        overflow-y:auto;transition:width .15s ease}
   .sidenav .lbl{color:var(--dim);font:600 10.5px/1 system-ui;letter-spacing:.24em;text-transform:uppercase;
        margin:0 0 14px 4px}
@@ -53,7 +56,7 @@
   .sidenav a.active{color:var(--acid);border-left-color:var(--acid);background:rgba(214,255,61,.07)}
   @media (max-width:1180px){
     :root{--sn-w:64px}
-    .sidenav{padding:74px 6px 22px 6px}
+    .sidenav{padding:22px 6px}
     .sidenav .lbl{display:none}
     .sidenav a{justify-content:center;padding:12px 4px;gap:0}
     .sidenav a .lb{display:none}
@@ -116,7 +119,7 @@
   <a href="/">Home</a>
   <a class="here" href="./">Plug-ins</a>
   <a href="/extensions/">Extensions</a>
-  <a href="https://sirius.x/" title="Register a BCNR name">sirius.x</a>
+  <a href="https://sirius.x/" title="Register a BCNR name"><svg class="tabicon" viewBox="0 0 64 64" aria-hidden="true"><rect width="64" height="64" rx="12" fill="#0b0e14"/><path d="M32 4 L36.4 27.6 L60 32 L36.4 36.4 L32 60 L27.6 36.4 L4 32 L27.6 27.6 Z" fill="#d6ff3d"/></svg>Sirius<span class="g">.X</span></a>
   <a class="get" href="/#download">Get Theseus</a>
 </nav>