Modificação nos modos, correção de textos cortados

lib/features/ai_tutor/presentation/widgets/chat_input.dart

@@ -53,10 +53,12 @@ class _ChatInputState extends State<ChatInput> {
 
   @override
   Widget build(BuildContext context) {
+    final cs = Theme.of(context).colorScheme;
+
     return Container(
       padding: const EdgeInsets.all(16.0),
       decoration: BoxDecoration(
-        color: Colors.white.withOpacity(0.95),
+        color: cs.surface.withOpacity(0.98),
         borderRadius: const BorderRadius.vertical(top: Radius.circular(20)),
         boxShadow: [
           BoxShadow(
@@ -169,17 +171,19 @@ class _ChatInputState extends State<ChatInput> {
   }
 
   Widget _buildInputField(BuildContext context) {
+    final cs = Theme.of(context).colorScheme;
+
     return Container(
       decoration: BoxDecoration(
         borderRadius: BorderRadius.circular(16),
         gradient: LinearGradient(
           colors: [
-            Colors.grey[100]!,
-            Colors.grey[50]!,
+            cs.surfaceContainerHighest,
+            cs.surface,
           ],
         ),
         border: Border.all(
-          color: Colors.grey[300]!,
+          color: cs.outline.withOpacity(0.3),
         ),
       ),
       child: Row(
@@ -190,9 +194,9 @@ class _ChatInputState extends State<ChatInput> {
               controller: widget.controller,
               focusNode: _focusNode,
               maxLines: _isExpanded ? 5 : 1,
-              style: const TextStyle(
+              style: TextStyle(
                 fontSize: 16,
-                color: Color(0xFF2D3748),
+                color: cs.onSurface,
               ),
               decoration: InputDecoration(
                 hintText: 'Faça sua pergunta sobre o conteúdo...',
@@ -253,8 +257,11 @@ class _ChatInputState extends State<ChatInput> {
                   height: 48,
                   decoration: BoxDecoration(
                     gradient: widget.controller.text.isNotEmpty
-                        ? const LinearGradient(
-                            colors: [Color(0xFF82C9BD), Color(0xFF6BA5A0)],
+                        ? LinearGradient(
+                            colors: [
+                              cs.primary,
+                              cs.primary.withOpacity(0.85),
+                            ],
                             begin: Alignment.topLeft,
                             end: Alignment.bottomRight,
                           )