Add heavy metal visual theme and venue badge levels

app/templates/index.html

@@ -14,7 +14,7 @@
 
     <link
         rel="stylesheet"
-        href="/static/style.css"
+        href="/static/css/style.css"
     >
 
     <style>
@@ -167,11 +167,14 @@
         .user-result-name span { color: #a8a29e; font-size: .86rem; }
 
         body {
-            background: radial-gradient(circle at 50% -20%, #3a0909 0, transparent 34rem), #050505;
+            background:
+                linear-gradient(rgba(4, 4, 6, .58), rgba(4, 4, 6, .72)),
+                url('/static/images/crowd-stage-background.webp') center top / cover fixed no-repeat,
+                #050505;
             min-height: 100vh;
         }
 
-        .page-header { padding-bottom: 22px; border-bottom: 1px solid #3f2424; }
+        .page-header { padding: 24px; border: 1px solid #5f1515; border-left: 4px solid #dc2626; border-radius: 14px; background: linear-gradient(110deg, rgba(10,10,10,.9), rgba(69,10,10,.28)); box-shadow: 0 12px 30px rgba(0,0,0,.3); }
         .page-header h1 { font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif; letter-spacing: .05em; text-transform: uppercase; text-shadow: 0 2px 18px rgba(185, 28, 28, .45); }
         .new-concert-button { background: #991b1b; border: 1px solid #dc2626; }
         .new-concert-button:hover { background: #b91c1c; }