Refractor. Update styling

vigilcare-dashboard/src/style.css

@@ -1,6 +1,79 @@
 @import "tailwindcss";
 
-/* 8px spacing rhythm — use Tailwind scale steps 2, 4, 6, 8, 12, 16 (8, 16, 24, 32, 48, 64 px) */
+@custom-variant dark (&:where(.dark, .dark *));
+
+/* Clinical surface tokens — swap under .dark */
+:root {
+  --surface: #f1f5f9;
+  --surface-raised: #ffffff;
+  --surface-muted: #e2e8f0;
+  --border-default: #cbd5e1;
+  --text-primary: #0f172a;
+  --text-secondary: #475569;
+  --text-muted: #64748b;
+  --brand-muted-fill: #ccfbf1;
+  --brand-muted-text: #0f766e;
+}
+
+.dark {
+  --surface: #0f172a;
+  --surface-raised: #1e293b;
+  --surface-muted: #334155;
+  --border-default: #334155;
+  --text-primary: #f1f5f9;
+  --text-secondary: #cbd5e1;
+  --text-muted: #94a3b8;
+  --brand-muted-fill: rgba(15, 118, 110, 0.25);
+  --brand-muted-text: #5eead4;
+}
+
+@theme {
+  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji",
+    "Segoe UI Emoji", "Segoe UI Symbol";
+
+  /* Brand accent (teal) */
+  --color-brand: #0f766e;
+  --color-brand-hover: #0d9488;
+  --color-brand-muted: #ccfbf1;
+  --color-brand-foreground: #ffffff;
+  --color-brand-soft: var(--brand-muted-fill);
+  --color-brand-soft-text: var(--brand-muted-text);
+
+  /* Surfaces */
+  --color-surface: var(--surface);
+  --color-surface-raised: var(--surface-raised);
+  --color-surface-muted: var(--surface-muted);
+  --color-border: var(--border-default);
+
+  /* Semantic text helpers */
+  --color-ink: var(--text-primary);
+  --color-ink-secondary: var(--text-secondary);
+  --color-ink-muted: var(--text-muted);
+
+  /* Severity (clinical meaning preserved) */
+  --color-severity-critical: #dc2626;
+  --color-severity-critical-light: #fef2f2;
+  --color-severity-critical-dark: #991b1b;
+  --color-severity-warning: #d97706;
+  --color-severity-warning-light: #fffbeb;
+  --color-severity-warning-dark: #92400e;
+  --color-severity-info: #0369a1;
+  --color-severity-info-light: #e0f2fe;
+  --color-severity-info-dark: #075985;
+
+  /* Status */
+  --color-status-open: #ef4444;
+  --color-status-acknowledged: #d97706;
+  --color-status-resolved: #16a34a;
+  --color-status-escalated: #b45309;
+
+  /* Risk */
+  --color-risk-low: #16a34a;
+  --color-risk-medium: #d97706;
+  --color-risk-high: #ef4444;
+}
+
+/* 8px spacing rhythm — use Tailwind scale steps 2, 4, 6, 8, 12, 16 */
 @layer base {
   html {
     -webkit-font-smoothing: antialiased;
@@ -10,6 +83,9 @@
   body {
     margin: 0;
     min-height: 100svh;
+    font-family: var(--font-sans);
+    background-color: var(--surface);
+    color: var(--text-primary);
   }
 
   #app {