Adding light theme

app/static/css/style.css

@@ -7,6 +7,9 @@
   --muted: #94a3b8;
   --primary: #6366f1;
   --danger: #ef4444;
+  --link: #a5b4fc;
+  --danger-fg: #fca5a5;
+  --shadow-lg: rgba(0, 0, 0, 0.5);
 }
 
 * {
@@ -22,7 +25,7 @@ body {
 }
 
 a {
-  color: #a5b4fc;
+  color: var(--link);
   text-decoration: none;
 }
 
@@ -109,7 +112,7 @@ a:hover {
 
 .nav-label {
   cursor: default;
-  color: #a5b4fc;
+  color: var(--link);
   white-space: nowrap;
   user-select: none;
   display: flex;
@@ -138,7 +141,7 @@ a:hover {
   padding: 0.3rem 0;
   min-width: 190px;
   z-index: 200;
-  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
+  box-shadow: 0 8px 24px var(--shadow-lg);
 }
 
 .nav-group:hover>.nav-dropdown {
@@ -151,7 +154,7 @@ a:hover {
   gap: 0.5rem;
   padding: 0.38rem 0.9rem;
   white-space: nowrap;
-  color: #a5b4fc;
+  color: var(--link);
 }
 
 .nav-dropdown a:hover {
@@ -525,7 +528,7 @@ textarea:focus {
 .btn-danger {
   background: transparent;
   border-color: var(--danger);
-  color: #fca5a5;
+  color: var(--danger-fg);
 }
 
 .btn-ghost {
@@ -558,8 +561,35 @@ textarea:focus {
 .alert {
   background: rgba(239, 68, 68, 0.15);
   border: 1px solid var(--danger);
-  color: #fca5a5;
+  color: var(--danger-fg);
   padding: 0.5rem 0.75rem;
   border-radius: 6px;
   margin-bottom: 0.75rem;
 }
+
+/* ─── Light theme ────────────────────────────────────────────────────────── */
+@media (prefers-color-scheme: light) {
+  :root {
+    --bg: #f8fafc;
+    --surface: #ffffff;
+    --surface-2: #f1f5f9;
+    --border: #e2e8f0;
+    --text: #0f172a;
+    --muted: #64748b;
+    --primary: #4f46e5;
+    --danger: #dc2626;
+    --link: #4338ca;
+    --danger-fg: #b91c1c;
+    --shadow-lg: rgba(0, 0, 0, 0.12);
+  }
+
+  /* Swap the select chevron to a darker arrow that reads on light backgrounds */
+  select {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
+  }
+
+  /* Soften the danger alert background on white cards */
+  .alert {
+    background: rgba(220, 38, 38, 0.08);
+  }
+}