diff --git a/.env.example b/.env.example
index 28cd8d9..065200d 100644
--- a/.env.example
+++ b/.env.example
@@ -1,7 +1,8 @@
 # Copy to .env and fill in your values
 
-# Pre-fills the server URL on the setup screen
+# Pre-fills the URLs on the setup screen
 NAVIDROME_URL=https://music.yourdomain.com
+BACKEND_URL=https://novasonic-api.yourdomain.com
 
 # Path to your Navidrome music library on the host
 MUSIC_PATH=/path/to/your/navidrome/music
diff --git a/app.js b/app.js
index 5bab516..94d1964 100644
--- a/app.js
+++ b/app.js
@@ -110,11 +110,9 @@ function disconnect(){
 window.addEventListener('load',()=>{
   const saved=localStorage.getItem('ns_cfg');
   if(saved){cfg=JSON.parse(saved);startApp()}
-  // Autofill server URL from Docker env (set via config.js)
-  if(window.NS_SERVER_URL){
-    const el=document.getElementById('srv-url');
-    if(el&&!el.value)el.value=window.NS_SERVER_URL;
-  }
+  // Autofill URLs from Docker env (set via config.js)
+  if(window.NS_SERVER_URL){const el=document.getElementById('srv-url');if(el&&!el.value)el.value=window.NS_SERVER_URL;}
+  if(window.NS_BACKEND_URL){const el=document.getElementById('backend-url');if(el&&!el.value)el.value=window.NS_BACKEND_URL;}
   document.getElementById('srv-pass').addEventListener('keydown',e=>{if(e.key==='Enter')doConnect()});
   audio.addEventListener('timeupdate',updateProgress);
   audio.addEventListener('ended',onEnded);
diff --git a/docker-compose.yml b/docker-compose.yml
index dcbce6a..48a1172 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -9,6 +9,7 @@ services:
       - "8080:80"          # route this port through your reverse proxy
     environment:
       - NAVIDROME_URL=${NAVIDROME_URL}   # pre-filled on the setup screen
+      - BACKEND_URL=${BACKEND_URL}       # pre-filled on the setup screen
 
   # ── Backend (yt-dlp download server) ─────────────────────────────────────────
   novasonic-backend:
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 1e72bda..2ff9196 100644
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 # Generate runtime config from env vars so the frontend knows the Navidrome URL
 cat > /usr/share/nginx/html/config.js <<EOF
-window.NS_SERVER_URL = "${NAVIDROME_URL:-}";
+window.NS_SERVER_URL  = "${NAVIDROME_URL:-}";
+window.NS_BACKEND_URL = "${BACKEND_URL:-}";
 EOF
 exec nginx -g "daemon off;"
diff --git a/styles.css b/styles.css
index 09e9637..fb59fc7 100644
--- a/styles.css
+++ b/styles.css
@@ -362,18 +362,17 @@ nav{flex:1;overflow-y:auto;padding:4px 10px}
   backdrop-filter:blur(28px);
   border-top:1px solid var(--border2);
   z-index:200;
-  padding:0 4px;
   padding-bottom:env(safe-area-inset-bottom);
 }
 .bottom-nav-inner{
   display:flex;flex-direction:column;align-items:stretch;
-  height:100%;max-width:500px;margin:0 auto;
+  height:100%;width:100%;
 }
 .bnav-item{
-  display:flex;flex-direction:column;align-items:center;gap:4px;
-  padding:8px 12px;border-radius:12px;cursor:pointer;
+  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
+  padding:6px 4px;border-radius:10px;cursor:pointer;
   font-size:10px;font-weight:600;color:var(--text3);
-  letter-spacing:.3px;min-width:52px;text-align:center;
+  letter-spacing:.3px;text-align:center;
   transition:color .15s,background .15s;
   border:none;background:none;font-family:var(--font);
   -webkit-tap-highlight-color:transparent;
@@ -384,10 +383,10 @@ nav{flex:1;overflow-y:auto;padding:4px 10px}
 .bnav-item svg{flex-shrink:0;transition:transform .15s}
 .bnav-item:active svg{transform:scale(.88)}
 /* Tab strip */
-.bnav-tabs{display:flex;justify-content:center;gap:6px;padding:5px 16px 2px;flex-shrink:0}
+.bnav-tabs{display:flex;width:100%;padding:4px 8px 2px;flex-shrink:0;gap:4px}
 .bnav-tab{flex:1;padding:3px 0;border-radius:7px;border:none;font-family:var(--font);font-size:10px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:var(--text3);cursor:pointer;background:none;transition:color .15s,background .15s;-webkit-tap-highlight-color:transparent}
 .bnav-tab.active{background:var(--surface2);color:var(--text)}
-.bnav-pages{display:grid;grid-template-columns:repeat(4,1fr);align-items:center;width:100%;gap:6px;flex:1}
+.bnav-pages{display:grid;grid-template-columns:repeat(4,1fr);align-items:stretch;width:100%;flex:1}
 
 @media(max-width:768px){
   .bottom-nav{display:flex;flex-direction:column;justify-content:flex-start}
@@ -400,8 +399,8 @@ nav{flex:1;overflow-y:auto;padding:4px 10px}
   .preview-bar{bottom:calc(var(--player-h) + 80px)}
   .toast-container{bottom:calc(var(--player-h) + 80px + 16px)}
   .jobs-panel{bottom:calc(var(--player-h) + 80px + 16px)}
-  .bnav-pages{grid-template-columns:repeat(4,1fr);gap:6px}
-  .bnav-item{min-width:0;width:100%;padding:8px 0 6px;box-sizing:border-box}
+  .bnav-pages{grid-template-columns:repeat(4,1fr)}
+  .bnav-item{min-width:0;width:100%;padding:6px 2px;box-sizing:border-box}
   #settings-modal{align-items:flex-start;padding-top:max(env(safe-area-inset-top),16px);padding-bottom:calc(var(--player-h) + 80px + env(safe-area-inset-bottom) + 8px)}
   #settings-modal .modal{max-height:100%!important;overflow:hidden}
 }
diff --git a/sw.js b/sw.js
index 4fba904..34fa6ee 100644
--- a/sw.js
+++ b/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'ns-v12';
+const CACHE = 'ns-v13';
 const PRECACHE = ['/', 'index.html', 'styles.css', 'app.js', 'sw.js'];
 const SKIP_URLS = ['/rest/stream', '/rest/download', '/config.js'];