feat: Fase 1 - Autenticação completa

- Prisma com SQLite configurado
- Tabelas: users, sessions, subscriptions, children, etc
- Auth.js com credentials provider
- API de registro com criação de usuário + criança
- Middleware para proteger rotas
- Login/Cadastro funcionais
- Dashboard com sessão real

src/app/globals.css

@@ -1,26 +1,57 @@
 @import "tailwindcss";
 
 :root {
-  --background: #ffffff;
-  --foreground: #171717;
-}
-
-@theme inline {
-  --color-background: var(--background);
-  --color-foreground: var(--foreground);
-  --font-sans: var(--font-geist-sans);
-  --font-mono: var(--font-geist-mono);
-}
-
-@media (prefers-color-scheme: dark) {
-  :root {
-    --background: #0a0a0a;
-    --foreground: #ededed;
-  }
+  --iris-purple: #6366f1;
+  --iris-purple-dark: #4f46e5;
+  --iris-blue: #3b82f6;
+  --iris-green: #10b981;
+  --iris-yellow: #f59e0b;
+  --iris-red: #ef4444;
+  --iris-rainbow: linear-gradient(90deg, #ef4444, #f59e0b, #eab308, #22c55e, #3b82f6, #8b5cf6);
 }
 
 body {
-  background: var(--background);
-  color: var(--foreground);
-  font-family: Arial, Helvetica, sans-serif;
+  font-family: 'Inter', system-ui, sans-serif;
+}
+
+.gradient-rainbow {
+  background: var(--iris-rainbow);
+}
+
+.text-gradient {
+  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #3b82f6 100%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+}
+
+.animate-float {
+  animation: float 3s ease-in-out infinite;
+}
+
+@keyframes float {
+  0%, 100% { transform: translateY(0); }
+  50% { transform: translateY(-10px); }
+}
+
+.chat-bubble {
+  position: relative;
+}
+
+.chat-bubble::after {
+  content: '';
+  position: absolute;
+  bottom: -8px;
+  left: 20px;
+  width: 0;
+  height: 0;
+  border-left: 10px solid transparent;
+  border-right: 10px solid transparent;
+  border-top: 10px solid #f3f4f6;
+}
+
+.chat-bubble-right::after {
+  left: auto;
+  right: 20px;
+  border-top-color: #6366f1;
 }