feat: improve dark mode contrast in Tower3D and IsolatedRoof3D components

app/src/components/three/IsolatedRoof3D.tsx

@@ -4,6 +4,7 @@ import * as THREE from 'three';
 import SceneCanvas from '../SceneCanvas';
 import FallbackDiagram from '../FallbackDiagram';
 import { WindArrow } from './WindArrow';
+import { useCanvasTheme } from '@/lib/theme';
 
 export interface IsolatedRoof3DInput {
   /** Tipo de cobertura: 'shed' (uma água) ou 'gable' (duas águas) */
@@ -43,6 +44,13 @@ function IsolatedRoofModel({
   cpeLeeward,
   forceKN,
 }: IsolatedRoof3DInput) {
+  const theme = useCanvasTheme();
+  const isDark = theme === 'dark';
+  const labelColor = isDark ? '#cbd5e1' : '#475569';
+  const textColor = isDark ? '#93c5fd' : '#1a202c';
+  const lineMaterialColor = isDark ? '#94a3b8' : '#64748b';
+  const pillarColor = isDark ? '#cbd5e1' : '#475569';
+
   const thetaRad = (theta * Math.PI) / 180;
   const halfDepth = depth / 2;
   const halfWidth = width / 2;
@@ -142,7 +150,7 @@ function IsolatedRoofModel({
       {pillars.map((p, i) => (
         <mesh key={`pillar-${i}`} position={p.pos} castShadow>
           <cylinderGeometry args={[0.06, 0.06, p.h, 16]} />
-          <meshStandardMaterial color="#475569" roughness={0.5} />
+          <meshStandardMaterial color={pillarColor} roughness={0.5} />
         </mesh>
       ))}
 
@@ -157,21 +165,21 @@ function IsolatedRoofModel({
       <group position={[-halfDepth - 0.4, 0, -halfDepth]}>
         <mesh position={[0, height / 2, 0]}>
           <boxGeometry args={[0.015, height, 0.015]} />
-          <meshStandardMaterial color="#64748b" />
+          <meshStandardMaterial color={lineMaterialColor} />
         </mesh>
         <mesh position={[0, height, 0]}>
           <boxGeometry args={[0.1, 0.015, 0.015]} />
-          <meshStandardMaterial color="#64748b" />
+          <meshStandardMaterial color={lineMaterialColor} />
         </mesh>
         <mesh position={[0, 0, 0]}>
           <boxGeometry args={[0.1, 0.015, 0.015]} />
-          <meshStandardMaterial color="#64748b" />
+          <meshStandardMaterial color={lineMaterialColor} />
         </mesh>
         <Text
           position={[-0.15, height / 2, 0]}
           rotation={[0, -Math.PI / 2, 0]}
           fontSize={0.25}
-          color="#475569"
+          color={labelColor}
           anchorX="center"
           anchorY="middle"
         >
@@ -183,21 +191,21 @@ function IsolatedRoofModel({
       <group position={[halfDepth + 0.4, height / 2, 0]}>
         <mesh position={[0, 0, 0]}>
           <boxGeometry args={[0.015, 0.015, depth]} />
-          <meshStandardMaterial color="#64748b" />
+          <meshStandardMaterial color={lineMaterialColor} />
         </mesh>
         <mesh position={[0, 0, halfDepth]}>
           <boxGeometry args={[0.1, 0.015, 0.015]} />
-          <meshStandardMaterial color="#64748b" />
+          <meshStandardMaterial color={lineMaterialColor} />
         </mesh>
         <mesh position={[0, 0, -halfDepth]}>
           <boxGeometry args={[0.1, 0.015, 0.015]} />
-          <meshStandardMaterial color="#64748b" />
+          <meshStandardMaterial color={lineMaterialColor} />
         </mesh>
         <Text
           position={[0.15, 0, 0]}
           rotation={[0, Math.PI / 2, 0]}
           fontSize={0.25}
-          color="#475569"
+          color={labelColor}
           anchorX="center"
           anchorY="middle"
         >
@@ -208,7 +216,7 @@ function IsolatedRoofModel({
       {/* Rótulo Superior */}
       <Text
         position={[0, centerY + 3, 0]}
-        color="#1a202c"
+        color={textColor}
         anchorX="center"
         anchorY="bottom"
       >

app/src/components/three/Tower3D.tsx

@@ -114,10 +114,16 @@ function buildTowerGeometry(
   return { nodes, members };
 }
 
-function pressureColor(phi: number, forceKN: number): THREE.Color {
+import { useCanvasTheme } from '@/lib/theme';
+
+function pressureColor(phi: number, forceKN: number, isDark: boolean): THREE.Color {
   const intensity = Math.min(1, (phi * forceKN) / 30);
   const hue = 220 - intensity * 220;
-  return new THREE.Color(`hsl(${hue}, ${60 + intensity * 30}%, ${50 - intensity * 10}%)`);
+  // Ajusta a luminosidade no HSL para contrastar melhor em fundos escuros
+  const lightness = isDark 
+    ? (60 + intensity * 10) 
+    : (50 - intensity * 10);
+  return new THREE.Color(`hsl(${hue}, ${60 + intensity * 30}%, ${lightness}%)`);
 }
 
 function TowerModel({
@@ -130,13 +136,16 @@ function TowerModel({
   alphaWind,
   forceKN,
 }: Tower3DInput) {
+  const theme = useCanvasTheme();
+  const isDark = theme === 'dark';
+
   const geometry = useMemo(
     () => buildTowerGeometry(section, panels, baseWidth, height),
     [section, panels, baseWidth, height],
   );
 
   const barRadius = barType === 'circular' ? 0.04 : 0.03;
-  const barColor = pressureColor(phi, forceKN);
+  const barColor = pressureColor(phi, forceKN, isDark);
 
   // Direção do vetor de força
   const alphaRad = (alphaWind * Math.PI) / 180;
@@ -150,14 +159,14 @@ function TowerModel({
       {/* Solo */}
       <mesh position={[0, 0, 0]} rotation={[-Math.PI / 2, 0, 0]} receiveShadow>
         <planeGeometry args={[baseWidth * 4, baseWidth * 4]} />
-        <meshStandardMaterial color="#94a3b8" opacity={0.2} transparent />
+        <meshStandardMaterial color={isDark ? "#334155" : "#94a3b8"} opacity={0.2} transparent />
       </mesh>
 
       {/* Nós (esferas pequenas) */}
       {geometry.nodes.map((node, idx) => (
         <mesh key={`node-${idx}`} position={node.toArray()} castShadow>
           <sphereGeometry args={[barRadius * 1.4, 8, 8]} />
-          <meshStandardMaterial color="#475569" />
+          <meshStandardMaterial color={isDark ? "#94a3b8" : "#475569"} />
         </mesh>
       ))}
 
@@ -178,9 +187,9 @@ function TowerModel({
 
         const color =
           m.type === 'leg'
-            ? '#1e293b'
+            ? (isDark ? '#f1f5f9' : '#1e293b')
             : m.type === 'horizontal'
-              ? '#64748b'
+              ? (isDark ? '#cbd5e1' : '#64748b')
               : barColor;
 
         return (
@@ -205,7 +214,7 @@ function TowerModel({
       <Text
         position={[0, height + 1.0, 0]}
         fontSize={0.5}
-        color="#1e40af"
+        color={isDark ? "#93c5fd" : "#1e40af"}
         anchorX="center"
         anchorY="bottom"
       >
@@ -216,6 +225,8 @@ function TowerModel({
 }
 
 export default function Tower3DViewer(input: Tower3DInput) {
+  const theme = useCanvasTheme();
+  const isDark = theme === 'dark';
   const { baseWidth, height } = input;
   const dist = Math.max(baseWidth * 3, height * 1.2);
 
@@ -236,7 +247,13 @@ export default function Tower3DViewer(input: Tower3DInput) {
       <ambientLight intensity={0.6} />
       <directionalLight position={[dist, height, dist]} intensity={1.2} castShadow shadow-mapSize-width={1024} shadow-mapSize-height={1024} />
       <TowerModel {...input} />
-      <Grid infiniteGrid fadeDistance={height * 2} sectionColor="#94a3b8" cellColor="#cbd5e1" position={[0, -0.01, 0]} />
+      <Grid 
+        infiniteGrid 
+        fadeDistance={height * 2} 
+        sectionColor={isDark ? "#475569" : "#94a3b8"} 
+        cellColor={isDark ? "#1e293b" : "#cbd5e1"} 
+        position={[0, -0.01, 0]} 
+      />
       <OrbitControls makeDefault minPolarAngle={0} maxPolarAngle={Math.PI / 2 - 0.05} />
       <Environment preset="city" />
     </SceneCanvas>

app/src/lib/theme.tsx

@@ -62,3 +62,23 @@ export function useTheme(): ThemeContextValue {
   if (!ctx) throw new Error('useTheme deve ser usado dentro de ThemeProvider');
   return ctx;
 }
+
+export function useCanvasTheme(): 'light' | 'dark' {
+  const [isDark, setIsDark] = useState(() => {
+    if (typeof document === 'undefined') return false;
+    return document.documentElement.classList.contains('dark');
+  });
+
+  useEffect(() => {
+    const observer = new MutationObserver(() => {
+      setIsDark(document.documentElement.classList.contains('dark'));
+    });
+    observer.observe(document.documentElement, {
+      attributes: true,
+      attributeFilter: ['class'],
+    });
+    return () => observer.disconnect();
+  }, []);
+
+  return isDark ? 'dark' : 'light';
+}

app/src/pages/IsolatedRoofModule.tsx

@@ -162,8 +162,8 @@ const IsolatedRoofModule: React.FC = () => {
       {/* Coluna Central: 3D */}
       <div className="flex-1 flex flex-col min-h-[500px] lg:min-h-0 bg-background rounded-xl border border-border shadow-sm overflow-hidden relative">
         <div className="absolute top-4 left-4 z-10 flex gap-2">
-          <Badge variant="secondary" className="bg-background/80 backdrop-blur-sm">θ = {theta}°</Badge>
+          <Badge variant="secondary" className="bg-background/80 text-foreground border border-border/80 backdrop-blur-sm shadow-sm">θ = {theta}°</Badge>
-          <Badge variant="secondary" className="bg-background/80 backdrop-blur-sm">{type === 'shed' ? 'Uma água' : 'Duas águas'}</Badge>
+          <Badge variant="secondary" className="bg-background/80 text-foreground border border-border/80 backdrop-blur-sm shadow-sm">{type === 'shed' ? 'Uma água' : 'Duas águas'}</Badge>
         </div>
         <div className="absolute top-4 right-4 z-10">
           <EducationalManual type="isolated-roof" params={{ theta, type }} />