style: increase card contrast vs background

- --surface: #142542 (was #0d1627, too close to bg #0A1628)
- --surface-alt: #0e2414 (stronger green tint for sealed fields)
- --border: rgba(255,255,255,0.09) (slightly more visible)
- .card-hover base border bumped to 0.12 alpha

vault1984.css

@@ -13,11 +13,11 @@
   --gap:          1.25rem;
 
   --bg:           #0A1628;
-  --surface:      #0d1627;
-  --surface-alt:  #0a1a0a;
+  --surface:      #142542;
+  --surface-alt:  #0e2414;
   --surface-gold: #2a1f00;
 
-  --border:       rgba(255,255,255,0.06);
+  --border:       rgba(255,255,255,0.09);
   --border-gold:  rgba(212,175,55,0.3);
 
   --text:         #f1f5f9;
@@ -65,7 +65,7 @@ p.lead                 { font-size: 1.125rem; }
 .card.alt              { background: var(--surface-alt);                                                                                              }
 .card.gold             { background: var(--surface-gold); border-color: var(--border-gold);                                                          }
 .card.red              { background: #1a0505;             border-color: rgba(239,68,68,0.3);                                                         }
-.card-hover            { transition: transform 0.2s, box-shadow 0.2s; }
+.card-hover            { transition: transform 0.2s, box-shadow 0.2s; border-color: rgba(255,255,255,0.12); }
 .card-hover:hover      { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.3); }
 
 /* === GRID === */