Add phase-aware frontend shell, polling client, and global exception handler

wwwroot/styles.css

@@ -1,20 +1,118 @@
 :root {
   font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
-  background: #0f172a;
-  color: #e2e8f0;
+  background: radial-gradient(circle at 20% 20%, #1f2937, #0b1224);
+  color: #e5e7eb;
 }
 
-.container {
-  max-width: 720px;
-  margin: 10vh auto;
+body {
+  margin: 0;
   padding: 24px;
-  background: rgba(15, 23, 42, 0.7);
-  border-radius: 12px;
-  border: 1px solid #1e293b;
-  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
 }
 
-h1 {
-  margin-top: 0;
-  letter-spacing: 0.5px;
+.hero {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  background: linear-gradient(135deg, #111827, #0f172a);
+  border: 1px solid #1f2937;
+  border-radius: 12px;
+  padding: 16px 20px;
+  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
 }
+
+.subtitle {
+  margin: 4px 0 0;
+  color: #9ca3af;
+}
+
+.phase-pill {
+  padding: 8px 12px;
+  background: #1d4ed8;
+  color: white;
+  border-radius: 999px;
+  font-weight: 600;
+  min-width: 96px;
+  text-align: center;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
+  gap: 16px;
+  margin-top: 16px;
+}
+
+.card {
+  background: rgba(17, 24, 39, 0.9);
+  border: 1px solid #1f2937;
+  border-radius: 12px;
+  padding: 16px;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
+}
+
+.card h2 {
+  margin-top: 0;
+  margin-bottom: 8px;
+}
+
+.stack {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.stack.horizontal {
+  flex-direction: row;
+  flex-wrap: wrap;
+}
+
+input, textarea, select, button {
+  font: inherit;
+  border-radius: 8px;
+  border: 1px solid #374151;
+  background: #0f172a;
+  color: #e5e7eb;
+  padding: 10px 12px;
+  min-width: 0;
+}
+
+textarea { min-height: 80px; resize: vertical; }
+
+button {
+  cursor: pointer;
+  background: #2563eb;
+  border-color: #1d4ed8;
+  font-weight: 600;
+}
+
+button:hover { background: #1d4ed8; }
+
+button.danger {
+  background: #dc2626;
+  border-color: #b91c1c;
+}
+
+.label { color: #9ca3af; font-size: 12px; }
+.hint { color: #9ca3af; font-size: 12px; margin: 8px 0 0; }
+
+.list { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-direction: column; gap: 10px; }
+.list li { padding: 12px; border: 1px solid #1f2937; border-radius: 8px; background: #0b1224; }
+
+.vote-row { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
+.vote-controls { display: flex; gap: 10px; align-items: center; min-width: 180px; }
+.score { font-weight: 700; }
+
+.hidden { display: none !important; }
+
+.toast {
+  position: fixed;
+  bottom: 16px;
+  right: 16px;
+  background: #2563eb;
+  color: white;
+  padding: 10px 14px;
+  border-radius: 8px;
+  box-shadow: 0 10px 24px rgba(0,0,0,0.35);
+  max-width: 320px;
+}
+.toast.error { background: #dc2626; }