diff --git a/frontend/src/components/Layout.tsx b/frontend/src/components/Layout.tsx
index 590ce21..1999a27 100644
--- a/frontend/src/components/Layout.tsx
+++ b/frontend/src/components/Layout.tsx
@@ -5,10 +5,12 @@ const linkClass = ({ isActive }: { isActive: boolean }) =>
 
 export function Layout() {
   return (
-    <div className="h-screen flex flex-col">
-      <header className="flex items-center gap-4 px-4 py-2 border-b border-white/10 bg-panel">
-        <h1 className="text-sm font-semibold tracking-wide text-white">🫀 Atlas 3D de Anatomia</h1>
-        <nav className="flex gap-1">
+    <div className="h-[100dvh] flex flex-col">
+      <header className="flex items-center gap-2 sm:gap-4 px-2 sm:px-4 py-2 border-b border-white/10 bg-panel overflow-x-auto">
+        <h1 className="text-sm font-semibold tracking-wide text-white whitespace-nowrap">
+          🫀 <span className="hidden sm:inline">Atlas 3D de Anatomia</span>
+        </h1>
+        <nav className="flex gap-1 shrink-0">
           <NavLink to="/" end className={linkClass}>
             Atlas
           </NavLink>
@@ -23,7 +25,7 @@ export function Layout() {
           href="https://github.com/LluisV/Z-Anatomy-Sample"
           target="_blank"
           rel="noreferrer"
-          className="ml-auto text-[11px] text-slate-500 hover:text-slate-300"
+          className="ml-auto hidden md:inline-block text-[11px] text-slate-500 hover:text-slate-300 shrink-0"
         >
           Modelos 3D: projeto Z-Anatomy (CC BY-SA 4.0)
         </a>
diff --git a/frontend/src/components/QuickRegionNav.tsx b/frontend/src/components/QuickRegionNav.tsx
index ef7badd..7cfeddf 100644
--- a/frontend/src/components/QuickRegionNav.tsx
+++ b/frontend/src/components/QuickRegionNav.tsx
@@ -18,12 +18,16 @@ export function QuickRegionNav() {
   const focusOnRegion = useAtlasStore((s) => s.focusOnRegion);
 
   return (
-    <div className="absolute top-3 left-1/2 -translate-x-1/2 flex flex-wrap gap-1.5 justify-center bg-panel/90 border border-white/10 rounded-lg px-3 py-2 shadow-lg max-w-[90%]">
+    <div
+      className="absolute top-14 md:top-3 left-1/2 -translate-x-1/2 flex gap-1.5
+        overflow-x-auto md:flex-wrap md:justify-center bg-panel/90 border border-white/10
+        rounded-lg px-3 py-2 shadow-lg max-w-[92vw] md:max-w-[90%]"
+    >
       {REGIONS.map((r) => (
         <button
           key={r.region}
           onClick={() => focusOnRegion(r.region)}
-          className="text-xs px-2.5 py-1 rounded-full bg-white/5 hover:bg-accent hover:text-white text-slate-300 transition-colors"
+          className="shrink-0 text-xs px-3 py-1.5 rounded-full bg-white/5 hover:bg-accent hover:text-white text-slate-300 transition-colors"
         >
           {r.label}
         </button>
diff --git a/frontend/src/components/SearchNav.tsx b/frontend/src/components/SearchNav.tsx
index ff4b225..69e3238 100644
--- a/frontend/src/components/SearchNav.tsx
+++ b/frontend/src/components/SearchNav.tsx
@@ -77,7 +77,7 @@ export function SearchNav() {
         value={query}
         onChange={(e) => setQuery(e.target.value)}
         placeholder="Buscar estrutura (ex: fêmur, nervo ciático)..."
-        className="w-full rounded bg-white/5 border border-white/10 px-3 py-2 text-sm placeholder:text-slate-500 focus:outline-none focus:ring-1 focus:ring-accent"
+        className="w-full rounded bg-white/5 border border-white/10 px-3 py-2 text-base sm:text-sm placeholder:text-slate-500 focus:outline-none focus:ring-1 focus:ring-accent"
       />
 
       <div className="overflow-y-auto flex-1 min-h-0 pr-1">
diff --git a/frontend/src/components/viewer/Scene.tsx b/frontend/src/components/viewer/Scene.tsx
index 8fbba46..7e2c265 100644
--- a/frontend/src/components/viewer/Scene.tsx
+++ b/frontend/src/components/viewer/Scene.tsx
@@ -209,6 +209,7 @@ export function Scene({ bySlug }: { bySlug: Map<string, Structure> }) {
   return (
     <Canvas
       shadows
+      dpr={[1, 1.5]}
       camera={{ position: [1.2, 1.4, 1.6], fov: 45, near: 0.01, far: 100000 }}
       gl={{ localClippingEnabled: true }}
     >
diff --git a/frontend/src/routes/AtlasPage.tsx b/frontend/src/routes/AtlasPage.tsx
index 29f7a12..28c9627 100644
--- a/frontend/src/routes/AtlasPage.tsx
+++ b/frontend/src/routes/AtlasPage.tsx
@@ -1,3 +1,4 @@
+import { useEffect, useState } from "react";
 import { useSystemStructures } from "../hooks/useSystemStructures.js";
 import { useAtlasStore } from "../store/useAtlasStore.js";
 import { Scene } from "../components/viewer/Scene.js";
@@ -7,13 +8,39 @@ import { SearchNav } from "../components/SearchNav.js";
 import { StructureInfoPanel } from "../components/StructureInfoPanel.js";
 import { QuickRegionNav } from "../components/QuickRegionNav.js";
 
+// Em telas pequenas não há espaço para os 3 painéis lado a lado — os
+// laterais viram gavetas (drawers) que deslizam por cima do visualizador
+// 3D, que fica sempre em tela cheia (é o que importa pra estudar).
 export default function AtlasPage() {
   const visibleSystems = useAtlasStore((s) => s.visibleSystems);
   const { bySlug } = useSystemStructures(visibleSystems);
+  const selectedStructureId = useAtlasStore((s) => s.selectedStructureId);
+
+  const [leftOpen, setLeftOpen] = useState(false);
+  const [rightOpen, setRightOpen] = useState(false);
+
+  useEffect(() => {
+    if (selectedStructureId) {
+      setRightOpen(true);
+      setLeftOpen(false);
+    }
+  }, [selectedStructureId]);
 
   return (
-    <div className="h-full grid grid-cols-[280px_1fr_320px]">
-      <aside className="border-r border-white/10 bg-panel p-3 flex flex-col min-h-0">
+    <div className="h-full relative md:grid md:grid-cols-[280px_1fr_320px]">
+      <aside
+        className={`fixed md:static inset-y-0 left-0 z-30 w-[86vw] max-w-[300px] md:w-auto
+          border-r border-white/10 bg-panel p-3 flex flex-col min-h-0 overflow-y-auto
+          transition-transform duration-200 md:translate-x-0
+          ${leftOpen ? "translate-x-0" : "-translate-x-full"}`}
+      >
+        <button
+          onClick={() => setLeftOpen(false)}
+          className="md:hidden self-end text-slate-400 hover:text-white text-sm mb-2 px-2 py-1"
+          aria-label="Fechar painel"
+        >
+          ✕ Fechar
+        </button>
         <LayerToggle />
         <ClippingControls />
         <div className="flex-1 min-h-0 mt-4">
@@ -21,12 +48,47 @@ export default function AtlasPage() {
         </div>
       </aside>
 
-      <div className="relative">
+      {(leftOpen || rightOpen) && (
+        <div
+          className="fixed inset-0 bg-black/50 z-20 md:hidden"
+          onClick={() => {
+            setLeftOpen(false);
+            setRightOpen(false);
+          }}
+        />
+      )}
+
+      <div className="relative h-full min-h-0">
         <Scene bySlug={bySlug} />
         <QuickRegionNav />
+
+        <button
+          onClick={() => setLeftOpen(true)}
+          className="md:hidden absolute top-3 left-3 z-10 bg-panel/90 border border-white/10 rounded-lg px-3 py-2 text-xs shadow-lg"
+        >
+          ☰ Camadas
+        </button>
+        <button
+          onClick={() => setRightOpen(true)}
+          className="md:hidden absolute top-3 right-3 z-10 bg-panel/90 border border-white/10 rounded-lg px-3 py-2 text-xs shadow-lg"
+        >
+          ℹ️ Detalhes
+        </button>
       </div>
 
-      <aside className="border-l border-white/10 bg-panel p-4 overflow-y-auto">
+      <aside
+        className={`fixed md:static inset-y-0 right-0 z-30 w-[86vw] max-w-[320px] md:w-auto
+          border-l border-white/10 bg-panel p-4 overflow-y-auto
+          transition-transform duration-200 md:translate-x-0
+          ${rightOpen ? "translate-x-0" : "translate-x-full"}`}
+      >
+        <button
+          onClick={() => setRightOpen(false)}
+          className="md:hidden text-slate-400 hover:text-white text-sm mb-2 px-2 py-1"
+          aria-label="Fechar painel"
+        >
+          ✕ Fechar
+        </button>
         <StructureInfoPanel bySlug={bySlug} />
       </aside>
     </div>
diff --git a/frontend/src/routes/PlanesPage.tsx b/frontend/src/routes/PlanesPage.tsx
index dfb2c43..8ccc49b 100644
--- a/frontend/src/routes/PlanesPage.tsx
+++ b/frontend/src/routes/PlanesPage.tsx
@@ -81,10 +81,24 @@ export default function PlanesPage() {
     transverse: false,
   });
   const [showAxes, setShowAxes] = useState(true);
+  const [leftOpen, setLeftOpen] = useState(false);
+  const [rightOpen, setRightOpen] = useState(false);
 
   return (
-    <div className="h-full grid grid-cols-[280px_1fr_300px]">
-      <aside className="border-r border-white/10 bg-panel p-4 space-y-3">
+    <div className="h-full relative md:grid md:grid-cols-[280px_1fr_300px]">
+      <aside
+        className={`fixed md:static inset-y-0 left-0 z-30 w-[86vw] max-w-[300px] md:w-auto
+          border-r border-white/10 bg-panel p-4 space-y-3 overflow-y-auto
+          transition-transform duration-200 md:translate-x-0
+          ${leftOpen ? "translate-x-0" : "-translate-x-full"}`}
+      >
+        <button
+          onClick={() => setLeftOpen(false)}
+          className="md:hidden float-right text-slate-400 hover:text-white text-sm px-2 py-1"
+          aria-label="Fechar painel"
+        >
+          ✕ Fechar
+        </button>
         <h3 className="text-xs uppercase tracking-wide text-slate-400 mb-2">Planos Anatômicos</h3>
         {PLANES.map((p) => (
           <label key={p.key} className="flex items-center gap-2 text-sm cursor-pointer">
@@ -105,8 +119,30 @@ export default function PlanesPage() {
         </label>
       </aside>
 
-      <div className="relative">
-        <Canvas camera={{ position: [1.8, 1.3, 2.2], fov: 45 }}>
+      {(leftOpen || rightOpen) && (
+        <div
+          className="fixed inset-0 bg-black/50 z-20 md:hidden"
+          onClick={() => {
+            setLeftOpen(false);
+            setRightOpen(false);
+          }}
+        />
+      )}
+
+      <div className="relative h-full min-h-0">
+        <button
+          onClick={() => setLeftOpen(true)}
+          className="md:hidden absolute top-3 left-3 z-10 bg-panel/90 border border-white/10 rounded-lg px-3 py-2 text-xs shadow-lg"
+        >
+          ☰ Planos
+        </button>
+        <button
+          onClick={() => setRightOpen(true)}
+          className="md:hidden absolute top-3 right-3 z-10 bg-panel/90 border border-white/10 rounded-lg px-3 py-2 text-xs shadow-lg"
+        >
+          📖 Glossário
+        </button>
+        <Canvas dpr={[1, 1.5]} camera={{ position: [1.8, 1.3, 2.2], fov: 45 }}>
           <color attach="background" args={["#0b1220"]} />
           <ambientLight intensity={0.6} />
           <directionalLight position={[2, 3, 2]} intensity={1} />
@@ -139,7 +175,19 @@ export default function PlanesPage() {
         </Canvas>
       </div>
 
-      <aside className="border-l border-white/10 bg-panel p-4 overflow-y-auto space-y-3">
+      <aside
+        className={`fixed md:static inset-y-0 right-0 z-30 w-[86vw] max-w-[320px] md:w-auto
+          border-l border-white/10 bg-panel p-4 overflow-y-auto space-y-3
+          transition-transform duration-200 md:translate-x-0
+          ${rightOpen ? "translate-x-0" : "translate-x-full"}`}
+      >
+        <button
+          onClick={() => setRightOpen(false)}
+          className="md:hidden text-slate-400 hover:text-white text-sm px-2 py-1"
+          aria-label="Fechar painel"
+        >
+          ✕ Fechar
+        </button>
         <h3 className="text-xs uppercase tracking-wide text-slate-400">Glossário de Direções</h3>
         {GLOSSARY.map((g) => (
           <div key={g.term}>
diff --git a/frontend/src/routes/QuizPage.tsx b/frontend/src/routes/QuizPage.tsx
index 1800009..fefa513 100644
--- a/frontend/src/routes/QuizPage.tsx
+++ b/frontend/src/routes/QuizPage.tsx
@@ -14,6 +14,7 @@ export default function QuizPage() {
   const [index, setIndex] = useState(0);
   const [feedback, setFeedback] = useState<"correct" | "wrong" | null>(null);
   const [score, setScore] = useState({ correct: 0, total: 0 });
+  const [layersOpen, setLayersOpen] = useState(false);
 
   const selectedStructureId = useAtlasStore((s) => s.selectedStructureId);
   const selectStructure = useAtlasStore((s) => s.selectStructure);
@@ -70,15 +71,41 @@ export default function QuizPage() {
   }
 
   return (
-    <div className="h-full grid grid-cols-[280px_1fr]">
-      <aside className="border-r border-white/10 bg-panel p-3 flex flex-col gap-4 min-h-0">
+    <div className="h-full relative md:grid md:grid-cols-[280px_1fr]">
+      <aside
+        className={`fixed md:static inset-y-0 left-0 z-30 w-[86vw] max-w-[300px] md:w-auto
+          border-r border-white/10 bg-panel p-3 flex flex-col gap-4 min-h-0 overflow-y-auto
+          transition-transform duration-200 md:translate-x-0
+          ${layersOpen ? "translate-x-0" : "-translate-x-full"}`}
+      >
+        <button
+          onClick={() => setLayersOpen(false)}
+          className="md:hidden self-end text-slate-400 hover:text-white text-sm px-2 py-1"
+          aria-label="Fechar painel"
+        >
+          ✕ Fechar
+        </button>
         <LayerToggle />
       </aside>
 
-      <div className="relative">
+      {layersOpen && (
+        <div
+          className="fixed inset-0 bg-black/50 z-20 md:hidden"
+          onClick={() => setLayersOpen(false)}
+        />
+      )}
+
+      <div className="relative h-full min-h-0">
         <Scene bySlug={bySlug} />
 
-        <div className="absolute top-3 left-1/2 -translate-x-1/2 bg-panel/95 border border-white/10 rounded-lg px-5 py-3 text-center shadow-lg max-w-md">
+        <button
+          onClick={() => setLayersOpen(true)}
+          className="md:hidden absolute top-3 left-3 z-10 bg-panel/90 border border-white/10 rounded-lg px-3 py-2 text-xs shadow-lg"
+        >
+          ☰ Camadas
+        </button>
+
+        <div className="absolute top-3 left-1/2 -translate-x-1/2 bg-panel/95 border border-white/10 rounded-lg px-3 py-2.5 sm:px-5 sm:py-3 text-center shadow-lg w-[80vw] sm:w-auto sm:max-w-md">
           {!current ? (
             <p className="text-sm text-slate-300">
               Nenhuma estrutura pendente de revisão agora. 🎉
@@ -88,7 +115,7 @@ export default function QuizPage() {
               <p className="text-xs text-slate-400 uppercase tracking-wide mb-1">
                 Onde fica esta estrutura?
               </p>
-              <p className="text-lg font-semibold text-white">{current.namePt}</p>
+              <p className="text-base sm:text-lg font-semibold text-white">{current.namePt}</p>
               <p className="text-xs text-slate-500 mb-2">{current.system.namePt}</p>
 
               {feedback === "correct" && (
@@ -102,14 +129,14 @@ export default function QuizPage() {
                 {feedback ? (
                   <button
                     onClick={next}
-                    className="text-sm px-3 py-1 rounded bg-accent text-white"
+                    className="text-sm px-3 py-1.5 rounded bg-accent text-white"
                   >
                     Próxima
                   </button>
                 ) : (
                   <button
                     onClick={giveUp}
-                    className="text-sm px-3 py-1 rounded bg-white/10 text-slate-200"
+                    className="text-sm px-3 py-1.5 rounded bg-white/10 text-slate-200"
                   >
                     Mostrar resposta
                   </button>