UI V3: add top navigation, sidebar layout, and dedicated loans/stats views

styles.css

@@ -27,6 +27,49 @@ body {
   min-height: 100vh;
 }
 
+.topbar {
+  position: sticky;
+  top: 0;
+  z-index: 60;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.8rem;
+  padding: 0.7rem 1rem;
+  border-bottom: 1px solid var(--border);
+  background: rgba(248, 250, 253, 0.92);
+  backdrop-filter: blur(8px);
+}
+
+.topbar-brand h1 {
+  margin: 0.1rem 0 0;
+  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
+}
+
+.topbar-nav {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.45rem;
+}
+
+.topnav-btn {
+  background: #dde7f3;
+  color: #1f324a;
+  border: 1px solid #cfd9e7;
+  border-radius: 10px;
+  padding: 0.48rem 0.72rem;
+  font-family: inherit;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+.topnav-btn.active {
+  background: #0f6ab8;
+  color: #ffffff;
+  border-color: #0f6ab8;
+}
+
 .tools-toggle-btn {
   position: fixed;
   top: 1rem;
@@ -161,12 +204,36 @@ body {
 }
 
 .app-shell {
-  width: min(1100px, 94vw);
-  margin: 2rem auto;
+  width: min(1320px, 95vw);
+  margin: 1rem auto 2rem;
   display: grid;
   gap: 1rem;
 }
 
+.v3-layout {
+  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
+  align-items: start;
+}
+
+.v3-main {
+  display: grid;
+  gap: 1rem;
+}
+
+.v3-sidebar {
+  position: sticky;
+  top: 5rem;
+}
+
+.sidebar-block + .sidebar-block {
+  margin-top: 0.9rem;
+}
+
+.sidebar-title {
+  margin: 0 0 0.7rem;
+  font-size: 1rem;
+}
+
 .hero,
 .panel {
   background: var(--surface);
@@ -206,6 +273,12 @@ h1 {
   color: var(--muted);
 }
 
+.stats-grid {
+  display: grid;
+  gap: 0.75rem;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+}
+
 .panel {
   padding: 1rem;
 }
@@ -819,7 +892,7 @@ body.ui-v2 .game-actions {
 
 body.ui-v2 .hero {
   position: sticky;
-  top: 4.2rem;
+  top: 5.3rem;
   z-index: 15;
 }
 
@@ -861,6 +934,22 @@ body.ui-v2 .hero {
 }
 
 @media (max-width: 900px) {
+  .topbar {
+    padding: 0.6rem 0.7rem;
+  }
+
+  .v3-layout {
+    grid-template-columns: 1fr;
+  }
+
+  .v3-sidebar {
+    position: static;
+  }
+
+  .stats-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
   .v2-toolbar {
     grid-template-columns: repeat(2, minmax(0, 1fr));
   }
@@ -881,6 +970,19 @@ body.ui-v2 .hero {
 }
 
 @media (max-width: 640px) {
+  .topbar-nav {
+    width: 100%;
+  }
+
+  .topnav-btn {
+    flex: 1 1 calc(50% - 0.3rem);
+    text-align: center;
+  }
+
+  .stats-grid {
+    grid-template-columns: 1fr;
+  }
+
   .grid-form,
   .game-form {
     grid-template-columns: 1fr;