diff --git a/main.cpp b/main.cpp
index 39baff9..102707f 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,11 +13,13 @@
 #include <memory>
 #include <algorithm>
 #include <climits>
+#include <string>
 
 // Build:
 //   mkdir build && cd build && cmake .. && make -j$(nproc)
 //   ./minicraft
 
+// ─── Constants ───────────────────────────────────────────────────────────────
 static const int   SCREEN_W    = 1280;
 static const int   SCREEN_H    = 720;
 static const int   CHUNK_SIZE  = 16;
@@ -29,24 +31,30 @@ static const float GRAVITY     = -22.0f;
 static const float JUMP_VEL    = 9.0f;
 static const float HW          = 0.3f;
 static const float PH          = 1.8f;
+static const int   HOTBAR_SIZE = 8;
 
+// ─── Block types ─────────────────────────────────────────────────────────────
 enum BlockType : uint8_t { AIR=0, GRASS, DIRT, STONE, WOOD, LEAVES, SAND, SNOW, WATER };
+static const int NUM_BLOCK_TYPES = 9;
 
 struct BlockColor { float r,g,b; };
 static const BlockColor BLOCK_COLORS[] = {
     {0,0,0},
-    {0.40f,0.72f,0.24f},
-    {0.55f,0.40f,0.22f},
-    {0.50f,0.50f,0.50f},
-    {0.45f,0.30f,0.15f},
-    {0.22f,0.55f,0.18f},
-    {0.88f,0.83f,0.52f},
-    {0.92f,0.95f,0.98f},
-    {0.18f,0.42f,0.88f},
+    {0.40f,0.72f,0.24f}, // GRASS
+    {0.55f,0.40f,0.22f}, // DIRT
+    {0.50f,0.50f,0.50f}, // STONE
+    {0.45f,0.30f,0.15f}, // WOOD
+    {0.22f,0.55f,0.18f}, // LEAVES
+    {0.88f,0.83f,0.52f}, // SAND
+    {0.92f,0.95f,0.98f}, // SNOW
+    {0.18f,0.42f,0.88f}, // WATER
+};
+static const char* BLOCK_NAMES[] = {
+    "Air","Grass","Dirt","Stone","Wood","Leaves","Sand","Snow","Water"
 };
 static const float FACE_SHADE[] = {1.0f, 0.5f, 0.8f, 0.7f, 0.65f, 0.65f};
 
-// Perlin noise
+// ─── Perlin Noise ─────────────────────────────────────────────────────────────
 static int P[512];
 static void initNoise(int seed){
     int perm[256]; for(int i=0;i<256;i++) perm[i]=i;
@@ -69,6 +77,7 @@ static float fbm(float x,float y,int oct=6){
     return val/max;
 }
 
+// ─── World chunk ─────────────────────────────────────────────────────────────
 struct Chunk {
     int cx,cz;
     uint8_t blocks[CHUNK_SIZE][WORLD_H][CHUNK_SIZE];
@@ -78,7 +87,6 @@ struct Chunk {
     Chunk(int cx,int cz):cx(cx),cz(cz){memset(blocks,AIR,sizeof(blocks));}
     ~Chunk(){if(VAO){glDeleteVertexArrays(1,&VAO);glDeleteBuffers(1,&VBO);glDeleteBuffers(1,&EBO);}}
 };
-
 struct ChunkKey{int x,z;bool operator==(const ChunkKey& o)const{return x==o.x&&z==o.z;}};
 struct ChunkKeyHash{size_t operator()(const ChunkKey& k)const{return std::hash<long long>()((long long)k.x<<32|(unsigned)k.z);}};
 using ChunkMap=std::unordered_map<ChunkKey,std::unique_ptr<Chunk>,ChunkKeyHash>;
@@ -93,28 +101,22 @@ static void generateChunk(Chunk& c){
         float detail=fbm(wx*2.0f+5.3f,wz*2.0f+1.7f,5);
         float ridge=1.0f-fabsf(fbm(wx*0.8f+3.1f,wz*0.8f+8.9f,4));
         float h=12.0f+cont*18.0f+detail*6.0f+ridge*14.0f*std::max(0.0f,cont);
-        int top=(int)h;
-        top=std::max(2,std::min(WORLD_H-2,top));
+        int top=(int)h; top=std::max(2,std::min(WORLD_H-2,top));
         bool isSand=(top<16),isSnow=(top>38);
         for(int y=0;y<WORLD_H;y++){
-            if(y==0)          c.blocks[x][y][z]=STONE;
-            else if(y<top-4)  c.blocks[x][y][z]=STONE;
-            else if(y<top)    c.blocks[x][y][z]=isSand?SAND:DIRT;
-            else if(y==top){
-                if(isSand)    c.blocks[x][y][z]=SAND;
-                else if(isSnow) c.blocks[x][y][z]=SNOW;
-                else          c.blocks[x][y][z]=GRASS;
-            } else if(y<=14)  c.blocks[x][y][z]=WATER;
-            else              c.blocks[x][y][z]=AIR;
+            if(y==0)         c.blocks[x][y][z]=STONE;
+            else if(y<top-4) c.blocks[x][y][z]=STONE;
+            else if(y<top)   c.blocks[x][y][z]=isSand?SAND:DIRT;
+            else if(y==top){ c.blocks[x][y][z]=isSand?SAND:(isSnow?SNOW:GRASS); }
+            else if(y<=14)   c.blocks[x][y][z]=WATER;
+            else             c.blocks[x][y][z]=AIR;
         }
         if(!isSand&&!isSnow&&top>=16&&top<36&&top+6<WORLD_H){
             unsigned col=(unsigned)((wx0+x)*73856093u^(unsigned)(wz0+z)*19349663u);
             if((col&0xFF)<18){
                 int trunk=top+1;
                 for(int t=trunk;t<trunk+4&&t<WORLD_H;t++) c.blocks[x][t][z]=WOOD;
-                for(int dx=-2;dx<=2;dx++)
-                for(int dz=-2;dz<=2;dz++)
-                for(int dy=trunk+2;dy<=trunk+5;dy++){
+                for(int dx=-2;dx<=2;dx++) for(int dz=-2;dz<=2;dz++) for(int dy=trunk+2;dy<=trunk+5;dy++){
                     int nx=x+dx,nz=z+dz;
                     if(nx>=0&&nx<CHUNK_SIZE&&nz>=0&&nz<CHUNK_SIZE&&dy<WORLD_H)
                         if(c.blocks[nx][dy][nz]==AIR) c.blocks[nx][dy][nz]=LEAVES;
@@ -126,59 +128,45 @@ static void generateChunk(Chunk& c){
 }
 
 static uint8_t getBlock(int wx,int wy,int wz){
-    if(wy<0) return STONE;
-    if(wy>=WORLD_H) return AIR;
+    if(wy<0) return STONE; if(wy>=WORLD_H) return AIR;
     int cx=(int)floorf((float)wx/CHUNK_SIZE),cz=(int)floorf((float)wz/CHUNK_SIZE);
-    auto it=CHUNKS.find({cx,cz});
-    if(it==CHUNKS.end()) return STONE;
-    int lx=wx-cx*CHUNK_SIZE,lz=wz-cz*CHUNK_SIZE;
-    return it->second->blocks[lx][wy][lz];
+    auto it=CHUNKS.find({cx,cz}); if(it==CHUNKS.end()) return STONE;
+    return it->second->blocks[wx-cx*CHUNK_SIZE][wy][wz-cz*CHUNK_SIZE];
 }
-
 static void setBlock(int wx,int wy,int wz,uint8_t val){
     if(wy<0||wy>=WORLD_H) return;
     int cx=(int)floorf((float)wx/CHUNK_SIZE),cz=(int)floorf((float)wz/CHUNK_SIZE);
-    auto it=CHUNKS.find({cx,cz});
-    if(it==CHUNKS.end()) return;
+    auto it=CHUNKS.find({cx,cz}); if(it==CHUNKS.end()) return;
     int lx=wx-cx*CHUNK_SIZE,lz=wz-cz*CHUNK_SIZE;
-    it->second->blocks[lx][wy][lz]=val;
-    it->second->meshDirty=true;
+    it->second->blocks[lx][wy][lz]=val; it->second->meshDirty=true;
     if(lx==0){auto n=CHUNKS.find({cx-1,cz});if(n!=CHUNKS.end())n->second->meshDirty=true;}
     if(lx==CHUNK_SIZE-1){auto n=CHUNKS.find({cx+1,cz});if(n!=CHUNKS.end())n->second->meshDirty=true;}
     if(lz==0){auto n=CHUNKS.find({cx,cz-1});if(n!=CHUNKS.end())n->second->meshDirty=true;}
     if(lz==CHUNK_SIZE-1){auto n=CHUNKS.find({cx,cz+1});if(n!=CHUNKS.end())n->second->meshDirty=true;}
 }
 
+// ─── World mesh ──────────────────────────────────────────────────────────────
 struct Vertex{float x,y,z,r,g,b;};
-
 static bool shouldDrawFace(uint8_t cur,int wx,int wy,int wz){
     uint8_t nb=getBlock(wx,wy,wz);
     if(nb==AIR) return true;
     if(nb==WATER||nb==LEAVES) return cur!=nb;
     return false;
 }
-
 static void addFace(std::vector<Vertex>& verts,std::vector<GLuint>& idx,
     glm::vec3 v0,glm::vec3 v1,glm::vec3 v2,glm::vec3 v3,float r,float g,float b,float shade){
-    GLuint base=(GLuint)verts.size();
-    float sr=r*shade,sg=g*shade,sb=b*shade;
-    verts.push_back({v0.x,v0.y,v0.z,sr,sg,sb});
-    verts.push_back({v1.x,v1.y,v1.z,sr,sg,sb});
-    verts.push_back({v2.x,v2.y,v2.z,sr,sg,sb});
-    verts.push_back({v3.x,v3.y,v3.z,sr,sg,sb});
+    GLuint base=(GLuint)verts.size(); float sr=r*shade,sg=g*shade,sb=b*shade;
+    verts.push_back({v0.x,v0.y,v0.z,sr,sg,sb}); verts.push_back({v1.x,v1.y,v1.z,sr,sg,sb});
+    verts.push_back({v2.x,v2.y,v2.z,sr,sg,sb}); verts.push_back({v3.x,v3.y,v3.z,sr,sg,sb});
     idx.insert(idx.end(),{base,base+1,base+2,base,base+2,base+3});
 }
-
 static void buildChunkMesh(Chunk& c){
     std::vector<Vertex> verts; std::vector<GLuint> idx;
     int wx0=c.cx*CHUNK_SIZE,wz0=c.cz*CHUNK_SIZE;
-    for(int x=0;x<CHUNK_SIZE;x++)
-    for(int y=0;y<WORLD_H;y++)
-    for(int z=0;z<CHUNK_SIZE;z++){
+    for(int x=0;x<CHUNK_SIZE;x++) for(int y=0;y<WORLD_H;y++) for(int z=0;z<CHUNK_SIZE;z++){
         uint8_t b=c.blocks[x][y][z]; if(b==AIR) continue;
         float r=BLOCK_COLORS[b].r,g=BLOCK_COLORS[b].g,bl=BLOCK_COLORS[b].b;
-        float bx=wx0+x,by=y,bz=wz0+z;
-        int wx=wx0+x,wz=wz0+z;
+        float bx=wx0+x,by=y,bz=wz0+z; int wx=wx0+x,wz=wz0+z;
         if(shouldDrawFace(b,wx,y+1,wz)) addFace(verts,idx,{bx,by+1,bz+1},{bx+1,by+1,bz+1},{bx+1,by+1,bz},{bx,by+1,bz},r,g,bl,FACE_SHADE[0]);
         if(shouldDrawFace(b,wx,y-1,wz)) addFace(verts,idx,{bx,by,bz},{bx+1,by,bz},{bx+1,by,bz+1},{bx,by,bz+1},r,g,bl,FACE_SHADE[1]);
         if(shouldDrawFace(b,wx,y,wz+1)) addFace(verts,idx,{bx,by,bz+1},{bx+1,by,bz+1},{bx+1,by+1,bz+1},{bx,by+1,bz+1},r,g,bl,FACE_SHADE[2]);
@@ -188,18 +176,14 @@ static void buildChunkMesh(Chunk& c){
     }
     if(!c.VAO){glGenVertexArrays(1,&c.VAO);glGenBuffers(1,&c.VBO);glGenBuffers(1,&c.EBO);}
     glBindVertexArray(c.VAO);
-    glBindBuffer(GL_ARRAY_BUFFER,c.VBO);
-    glBufferData(GL_ARRAY_BUFFER,verts.size()*sizeof(Vertex),verts.data(),GL_DYNAMIC_DRAW);
-    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,c.EBO);
-    glBufferData(GL_ELEMENT_ARRAY_BUFFER,idx.size()*sizeof(GLuint),idx.data(),GL_DYNAMIC_DRAW);
-    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),(void*)0);
-    glEnableVertexAttribArray(0);
-    glVertexAttribPointer(1,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),(void*)(3*sizeof(float)));
-    glEnableVertexAttribArray(1);
-    c.indexCount=(int)idx.size();
-    c.meshDirty=false;
+    glBindBuffer(GL_ARRAY_BUFFER,c.VBO); glBufferData(GL_ARRAY_BUFFER,verts.size()*sizeof(Vertex),verts.data(),GL_DYNAMIC_DRAW);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,c.EBO); glBufferData(GL_ELEMENT_ARRAY_BUFFER,idx.size()*sizeof(GLuint),idx.data(),GL_DYNAMIC_DRAW);
+    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),(void*)0); glEnableVertexAttribArray(0);
+    glVertexAttribPointer(1,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),(void*)(3*sizeof(float))); glEnableVertexAttribArray(1);
+    c.indexCount=(int)idx.size(); c.meshDirty=false;
 }
 
+// ─── Shaders ─────────────────────────────────────────────────────────────────
 static const char* VS_SRC=R"(
 #version 330 core
 layout(location=0) in vec3 aPos;
@@ -207,46 +191,344 @@ layout(location=1) in vec3 aColor;
 out vec3 vColor; out float vFog;
 uniform mat4 uMVP; uniform vec3 uCamPos;
 void main(){
-    gl_Position=uMVP*vec4(aPos,1.0);
-    vColor=aColor;
+    gl_Position=uMVP*vec4(aPos,1.0); vColor=aColor;
     float dist=length(aPos-uCamPos);
     vFog=clamp((dist-60.0)/40.0,0.0,1.0);
 })";
 static const char* FS_SRC=R"(
 #version 330 core
-in vec3 vColor; in float vFog;
-out vec4 fragColor;
+in vec3 vColor; in float vFog; out vec4 fragColor;
 void main(){
     vec3 fogColor=vec3(0.53,0.81,0.98);
     fragColor=vec4(mix(vColor,fogColor,vFog),1.0);
 })";
 
+static const char* VS_UI=R"(
+#version 330 core
+layout(location=0) in vec2 aPos;
+layout(location=1) in vec3 aColor;
+out vec3 vColor;
+uniform mat4 uProj;
+void main(){ gl_Position=uProj*vec4(aPos,0.0,1.0); vColor=aColor; })";
+static const char* FS_UI=R"(
+#version 330 core
+in vec3 vColor; out vec4 fragColor;
+uniform float uAlpha;
+void main(){ fragColor=vec4(vColor,uAlpha); })";
+
 static GLuint compileShader(GLenum type,const char* src){
     GLuint s=glCreateShader(type); glShaderSource(s,1,&src,nullptr); glCompileShader(s);
     GLint ok; glGetShaderiv(s,GL_COMPILE_STATUS,&ok);
-    if(!ok){char buf[512];glGetShaderInfoLog(s,512,nullptr,buf);std::cerr<<"Shader: "<<buf<<"\n";}
+    if(!ok){char buf[512];glGetShaderInfoLog(s,512,nullptr,buf);std::cerr<<"Shader err: "<<buf<<"\n";}
     return s;
 }
-static GLuint buildProgram(){
-    GLuint vs=compileShader(GL_VERTEX_SHADER,VS_SRC),fs=compileShader(GL_FRAGMENT_SHADER,FS_SRC);
-    GLuint p=glCreateProgram(); glAttachShader(p,vs); glAttachShader(p,fs); glLinkProgram(p);
-    glDeleteShader(vs); glDeleteShader(fs); return p;
+static GLuint buildProg(const char* vs,const char* fs){
+    GLuint v=compileShader(GL_VERTEX_SHADER,vs),f=compileShader(GL_FRAGMENT_SHADER,fs);
+    GLuint p=glCreateProgram(); glAttachShader(p,v); glAttachShader(p,f); glLinkProgram(p);
+    glDeleteShader(v); glDeleteShader(f); return p;
 }
 
-struct Camera{
-    glm::vec3 pos{0,40,0}; float yaw=0,pitch=0;
-    glm::vec3 vel{0,0,0}; bool onGround=false;
-    glm::vec3 forward()const{float y=glm::radians(yaw),p=glm::radians(pitch);return glm::normalize(glm::vec3(cosf(p)*cosf(y),sinf(p),cosf(p)*sinf(y)));}
+// ─── 2D UI Renderer ──────────────────────────────────────────────────────────
+struct UIRenderer {
+    GLuint prog=0,VAO=0,VBO=0;
+    GLint projLoc=-1,alphaLoc=-1;
+    glm::mat4 proj{1.0f};
+
+    void init(){
+        prog=buildProg(VS_UI,FS_UI);
+        projLoc=glGetUniformLocation(prog,"uProj");
+        alphaLoc=glGetUniformLocation(prog,"uAlpha");
+        proj=glm::ortho(0.0f,(float)SCREEN_W,(float)SCREEN_H,0.0f);
+
+        glGenVertexArrays(1,&VAO);
+        glGenBuffers(1,&VBO);
+        glBindVertexArray(VAO);
+        glBindBuffer(GL_ARRAY_BUFFER,VBO);
+        glBufferData(GL_ARRAY_BUFFER,1024*sizeof(float),nullptr,GL_DYNAMIC_DRAW);
+        glVertexAttribPointer(0,2,GL_FLOAT,GL_FALSE,5*sizeof(float),(void*)0);
+        glEnableVertexAttribArray(0);
+        glVertexAttribPointer(1,3,GL_FLOAT,GL_FALSE,5*sizeof(float),(void*)(2*sizeof(float)));
+        glEnableVertexAttribArray(1);
+        glBindVertexArray(0);
+    }
+
+    void begin(){
+        glDisable(GL_DEPTH_TEST);
+        glDisable(GL_CULL_FACE);
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+        glUseProgram(prog);
+        glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(proj));
+        glBindVertexArray(VAO);
+    }
+
+    void end(){
+        glDisable(GL_BLEND);
+        glEnable(GL_DEPTH_TEST);
+        glEnable(GL_CULL_FACE);
+        glBindVertexArray(0);
+    }
+
+    void rect(float x,float y,float w,float h,float r,float g,float b,float a=1.0f){
+        float verts[]={
+            x,   y,   r,g,b,
+            x+w, y,   r,g,b,
+            x+w, y+h, r,g,b,
+            x,   y,   r,g,b,
+            x+w, y+h, r,g,b,
+            x,   y+h, r,g,b
+        };
+        glUniform1f(alphaLoc,a);
+        glBindBuffer(GL_ARRAY_BUFFER,VBO);
+        glBufferSubData(GL_ARRAY_BUFFER,0,sizeof(verts),verts);
+        glDrawArrays(GL_TRIANGLES,0,6);
+    }
+
+    void outline(float x,float y,float w,float h,float r,float g,float b,float t=2.0f){
+        rect(x,y,w,t,r,g,b);
+        rect(x,y+h-t,w,t,r,g,b);
+        rect(x,y,t,h,r,g,b);
+        rect(x+w-t,y,t,h,r,g,b);
+    }
+};
+
+// ─── Global UI + PlayerModel forward declarations ────────────────────────────
+// Declared here so drawText / drawHUD / drawInventory can use them.
+static UIRenderer UI;
+
+// ─── Tiny bitmap font (5×7 per glyph, ASCII 32–126) ─────────────────────────
+static const uint8_t FONT5x7[][5] = {
+    {0x00,0x00,0x00,0x00,0x00}, // space
+    {0x00,0x00,0x5F,0x00,0x00}, // !
+    {0x00,0x07,0x00,0x07,0x00}, // "
+    {0x14,0x7F,0x14,0x7F,0x14}, // #
+    {0x24,0x2A,0x7F,0x2A,0x12}, // $
+    {0x23,0x13,0x08,0x64,0x62}, // %
+    {0x36,0x49,0x55,0x22,0x50}, // &
+    {0x00,0x05,0x03,0x00,0x00}, // '
+    {0x00,0x1C,0x22,0x41,0x00}, // (
+    {0x00,0x41,0x22,0x1C,0x00}, // )
+    {0x14,0x08,0x3E,0x08,0x14}, // *
+    {0x08,0x08,0x3E,0x08,0x08}, // +
+    {0x00,0x50,0x30,0x00,0x00}, // ,
+    {0x08,0x08,0x08,0x08,0x08}, // -
+    {0x00,0x60,0x60,0x00,0x00}, // .
+    {0x20,0x10,0x08,0x04,0x02}, // /
+    {0x3E,0x51,0x49,0x45,0x3E}, // 0
+    {0x00,0x42,0x7F,0x40,0x00}, // 1
+    {0x42,0x61,0x51,0x49,0x46}, // 2
+    {0x21,0x41,0x45,0x4B,0x31}, // 3
+    {0x18,0x14,0x12,0x7F,0x10}, // 4
+    {0x27,0x45,0x45,0x45,0x39}, // 5
+    {0x3C,0x4A,0x49,0x49,0x30}, // 6
+    {0x01,0x71,0x09,0x05,0x03}, // 7
+    {0x36,0x49,0x49,0x49,0x36}, // 8
+    {0x06,0x49,0x49,0x29,0x1E}, // 9
+    {0x00,0x36,0x36,0x00,0x00}, // :
+    {0x00,0x56,0x36,0x00,0x00}, // ;
+    {0x08,0x14,0x22,0x41,0x00}, // <
+    {0x14,0x14,0x14,0x14,0x14}, // =
+    {0x00,0x41,0x22,0x14,0x08}, // >
+    {0x02,0x01,0x51,0x09,0x06}, // ?
+    {0x32,0x49,0x79,0x41,0x3E}, // @
+    {0x7E,0x11,0x11,0x11,0x7E}, // A
+    {0x7F,0x49,0x49,0x49,0x36}, // B
+    {0x3E,0x41,0x41,0x41,0x22}, // C
+    {0x7F,0x41,0x41,0x22,0x1C}, // D
+    {0x7F,0x49,0x49,0x49,0x41}, // E
+    {0x7F,0x09,0x09,0x09,0x01}, // F
+    {0x3E,0x41,0x49,0x49,0x7A}, // G
+    {0x7F,0x08,0x08,0x08,0x7F}, // H
+    {0x00,0x41,0x7F,0x41,0x00}, // I
+    {0x20,0x40,0x41,0x3F,0x01}, // J
+    {0x7F,0x08,0x14,0x22,0x41}, // K
+    {0x7F,0x40,0x40,0x40,0x40}, // L
+    {0x7F,0x02,0x04,0x02,0x7F}, // M
+    {0x7F,0x04,0x08,0x10,0x7F}, // N
+    {0x3E,0x41,0x41,0x41,0x3E}, // O
+    {0x7F,0x09,0x09,0x09,0x06}, // P
+    {0x3E,0x41,0x51,0x21,0x5E}, // Q
+    {0x7F,0x09,0x19,0x29,0x46}, // R
+    {0x46,0x49,0x49,0x49,0x31}, // S
+    {0x01,0x01,0x7F,0x01,0x01}, // T
+    {0x3F,0x40,0x40,0x40,0x3F}, // U
+    {0x1F,0x20,0x40,0x20,0x1F}, // V
+    {0x3F,0x40,0x38,0x40,0x3F}, // W
+    {0x63,0x14,0x08,0x14,0x63}, // X
+    {0x07,0x08,0x70,0x08,0x07}, // Y
+    {0x61,0x51,0x49,0x45,0x43}, // Z
+    {0x00,0x7F,0x41,0x41,0x00}, // [
+    {0x02,0x04,0x08,0x10,0x20}, // backslash
+    {0x00,0x41,0x41,0x7F,0x00}, // ]
+    {0x04,0x02,0x01,0x02,0x04}, // ^
+    {0x40,0x40,0x40,0x40,0x40}, // _
+    {0x00,0x01,0x02,0x04,0x00}, // `
+    {0x20,0x54,0x54,0x54,0x78}, // a
+    {0x7F,0x48,0x44,0x44,0x38}, // b
+    {0x38,0x44,0x44,0x44,0x20}, // c
+    {0x38,0x44,0x44,0x48,0x7F}, // d
+    {0x38,0x54,0x54,0x54,0x18}, // e
+    {0x08,0x7E,0x09,0x01,0x02}, // f
+    {0x0C,0x52,0x52,0x52,0x3E}, // g
+    {0x7F,0x08,0x04,0x04,0x78}, // h
+    {0x00,0x44,0x7D,0x40,0x00}, // i
+    {0x20,0x40,0x44,0x3D,0x00}, // j
+    {0x7F,0x10,0x28,0x44,0x00}, // k
+    {0x00,0x41,0x7F,0x40,0x00}, // l
+    {0x7C,0x04,0x18,0x04,0x78}, // m
+    {0x7C,0x08,0x04,0x04,0x78}, // n
+    {0x38,0x44,0x44,0x44,0x38}, // o
+    {0x7C,0x14,0x14,0x14,0x08}, // p
+    {0x08,0x14,0x14,0x18,0x7C}, // q
+    {0x7C,0x08,0x04,0x04,0x08}, // r
+    {0x48,0x54,0x54,0x54,0x20}, // s
+    {0x04,0x3F,0x44,0x40,0x20}, // t
+    {0x3C,0x40,0x40,0x20,0x7C}, // u
+    {0x1C,0x20,0x40,0x20,0x1C}, // v
+    {0x3C,0x40,0x30,0x40,0x3C}, // w
+    {0x44,0x28,0x10,0x28,0x44}, // x
+    {0x0C,0x50,0x50,0x50,0x3C}, // y
+    {0x44,0x64,0x54,0x4C,0x44}, // z
+    {0x00,0x08,0x36,0x41,0x00}, // {
+    {0x00,0x00,0x7F,0x00,0x00}, // |
+    {0x00,0x41,0x36,0x08,0x00}, // }
+    {0x10,0x08,0x08,0x10,0x08}, // ~
+};
+
+static void drawText(const char* text,float x,float y,float scale,
+                     float r,float g,float b,float a=1.0f){
+    float cx=x;
+    for(int i=0;text[i];i++){
+        int c=text[i]-32;
+        if(c<0||c>=(int)(sizeof(FONT5x7)/sizeof(FONT5x7[0]))){cx+=(6*scale);continue;}
+        for(int col=0;col<5;col++){
+            uint8_t bits=FONT5x7[c][col];
+            for(int row=0;row<7;row++){
+                if(bits&(1<<row))
+                    UI.rect(cx+col*scale,y+row*scale,scale,scale,r,g,b,a);
+            }
+        }
+        cx+=6*scale;
+    }
+}
+
+// ─── Inventory ───────────────────────────────────────────────────────────────
+struct Inventory {
+    uint8_t hotbar[HOTBAR_SIZE]={GRASS,DIRT,STONE,WOOD,LEAVES,SAND,SNOW,WATER};
+    int selected=0;
+    bool open=false;
+    uint8_t selectedBlock()const{return hotbar[selected];}
+};
+
+static void drawInventory(Inventory& inv){
+    const float SLOT=52.0f;
+    const float GAP=6.0f;
+    const float BORDER=4.0f;
+    int n=HOTBAR_SIZE;
+    float totalW=n*(SLOT+GAP)-GAP;
+    float hx=(SCREEN_W-totalW)*0.5f;
+    float hy=SCREEN_H-SLOT-16.0f;
+
+    // Background bar
+    UI.rect(hx-8,hy-8,totalW+16,SLOT+16,0.15f,0.15f,0.15f,0.75f);
+    UI.outline(hx-8,hy-8,totalW+16,SLOT+16,0.0f,0.0f,0.0f);
+
+    for(int i=0;i<n;i++){
+        float sx=hx+i*(SLOT+GAP),sy=hy;
+        bool sel=(i==inv.selected);
+        UI.rect(sx,sy,SLOT,SLOT,sel?0.30f:0.20f,sel?0.30f:0.20f,sel?0.30f:0.20f,0.9f);
+        uint8_t bt=inv.hotbar[i];
+        if(bt!=AIR){
+            auto& bc=BLOCK_COLORS[bt];
+            UI.rect(sx+BORDER,sy+BORDER,SLOT-2*BORDER,SLOT-2*BORDER-10,bc.r,bc.g,bc.b,1.0f);
+            UI.rect(sx+BORDER,sy+SLOT-BORDER-10-4,SLOT-2*BORDER,4,bc.r*0.65f,bc.g*0.65f,bc.b*0.65f,1.0f);
+        }
+        if(sel) UI.outline(sx,sy,SLOT,SLOT,1.0f,1.0f,1.0f,BORDER*0.5f);
+        else    UI.outline(sx,sy,SLOT,SLOT,0.0f,0.0f,0.0f,2.0f);
+        char num[3]; snprintf(num,3,"%d",i+1);
+        drawText(num,sx+4,sy+SLOT-12,1.5f,0.8f,0.8f,0.8f);
+    }
+
+    {
+        uint8_t bt=inv.selectedBlock();
+        const char* name=BLOCK_NAMES[bt];
+        float tw=strlen(name)*6*2.0f;
+        drawText(name,(SCREEN_W-tw)*0.5f,hy-26,2.0f,1.0f,1.0f,1.0f,0.9f);
+    }
+
+    if(!inv.open) return;
+
+    const int COLS=4;
+    const int ROWS=(NUM_BLOCK_TYPES-1+COLS-1)/COLS;
+    float iw=COLS*(SLOT+GAP)-GAP+32.0f;
+    float ih=ROWS*(SLOT+GAP)-GAP+60.0f;
+    float ix=(SCREEN_W-iw)*0.5f;
+    float iy=(SCREEN_H-ih)*0.5f;
+
+    UI.rect(0,0,(float)SCREEN_W,(float)SCREEN_H,0,0,0,0.45f);
+    UI.rect(ix,iy,iw,ih,0.18f,0.18f,0.18f,0.95f);
+    UI.outline(ix,iy,iw,ih,0.6f,0.6f,0.6f,2.0f);
+    drawText("INVENTORY",ix+10,iy+10,2.0f,1.0f,1.0f,1.0f);
+
+    for(int bi=1;bi<NUM_BLOCK_TYPES;bi++){
+        int row=(bi-1)/COLS,col=(bi-1)%COLS;
+        float sx=ix+16+col*(SLOT+GAP);
+        float sy=iy+40+row*(SLOT+GAP);
+        bool inHotbar=false;
+        for(int h=0;h<HOTBAR_SIZE;h++) if(inv.hotbar[h]==bi) inHotbar=true;
+        auto& bc=BLOCK_COLORS[bi];
+        UI.rect(sx,sy,SLOT,SLOT,0.25f,0.25f,0.25f,0.9f);
+        UI.rect(sx+BORDER,sy+BORDER,SLOT-2*BORDER,SLOT-2*BORDER-8,bc.r,bc.g,bc.b,1.0f);
+        UI.rect(sx+BORDER,sy+SLOT-BORDER-8-4,SLOT-2*BORDER,4,bc.r*0.65f,bc.g*0.65f,bc.b*0.65f,1.0f);
+        UI.outline(sx,sy,SLOT,SLOT,inHotbar?1.0f:0.4f,inHotbar?1.0f:0.4f,inHotbar?0.0f:0.4f,2.0f);
+        float scale=1.5f;
+        float tw=strlen(BLOCK_NAMES[bi])*6*scale;
+        float tx=sx+(SLOT-tw)*0.5f;
+        drawText(BLOCK_NAMES[bi],tx,sy+SLOT-10,scale,0.9f,0.9f,0.9f);
+    }
+    drawText("Click a slot (1-8) to select. E to close.",ix+10,iy+ih-18,1.5f,0.7f,0.7f,0.7f);
+}
+
+// ─── HUD ─────────────────────────────────────────────────────────────────────
+static void drawHUD(const glm::vec3& pos,uint8_t /*selBlock*/,bool thirdPerson){
+    float cx=(float)SCREEN_W/2,cy=(float)SCREEN_H/2;
+    UI.rect(cx-1,cy-10,2,20,1,1,1,0.85f);
+    UI.rect(cx-10,cy-1,20,2,1,1,1,0.85f);
+    UI.rect(cx-1,cy-1,2,2,0,0,0,0.85f);
+
+    char buf[64];
+    snprintf(buf,64,"X:%.0f Y:%.0f Z:%.0f",pos.x,pos.y-PH,pos.z);
+    UI.rect(6,6,strlen(buf)*6*1.5f+6,18,0,0,0,0.5f);
+    drawText(buf,9,9,1.5f,1.0f,1.0f,1.0f);
+
+    if(thirdPerson)
+        drawText("F5: 3rd Person",9,28,1.5f,1.0f,1.0f,0.6f);
+}
+
+// ─── Camera / Player ─────────────────────────────────────────────────────────
+struct Camera {
+    glm::vec3 pos{0,40,0};
+    float yaw=0,pitch=0;
+    glm::vec3 vel{0,0,0};
+    bool onGround=false;
+
+    glm::vec3 forward()const{
+        float y=glm::radians(yaw),p=glm::radians(pitch);
+        return glm::normalize(glm::vec3(cosf(p)*cosf(y),sinf(p),cosf(p)*sinf(y)));
+    }
     glm::vec3 right()const{return glm::normalize(glm::cross(forward(),{0,1,0}));}
-    glm::mat4 view()const{return glm::lookAt(pos,pos+forward(),{0,1,0});}
+    glm::mat4 firstPersonView()const{return glm::lookAt(pos,pos+forward(),{0,1,0});}
+    glm::mat4 thirdPersonView()const{
+        glm::vec3 fwd=forward();
+        glm::vec3 eye=pos-fwd*6.0f+glm::vec3(0,2,0);
+        return glm::lookAt(eye,pos,{0,1,0});
+    }
 };
 
 static bool solidAt(float fx,float fy,float fz){
     int x=(int)floorf(fx),y=(int)floorf(fy),z=(int)floorf(fz);
-    if(y<0) return true;
-    if(y>=WORLD_H) return false;
-    uint8_t b=getBlock(x,y,z);
-    return b!=AIR&&b!=WATER&&b!=LEAVES;
+    if(y<0) return true; if(y>=WORLD_H) return false;
+    uint8_t b=getBlock(x,y,z); return b!=AIR&&b!=WATER&&b!=LEAVES;
 }
 static bool aabbSolid(float px,float py,float pz){
     int x0=(int)floorf(px-HW),x1=(int)floorf(px+HW);
@@ -273,6 +555,77 @@ static void moveCamera(Camera& cam,const glm::vec3& move,float dt){
     }
 }
 
+// ─── Player model (3rd person) ───────────────────────────────────────────────
+struct PlayerModel {
+    GLuint VAO=0,VBO=0,EBO=0;
+    std::vector<Vertex> verts;
+    std::vector<GLuint> idx;
+    int indexCount=0;
+
+    void addBox(float x0,float y0,float z0,float x1,float y1,float z1,
+                float r,float g,float b){
+        auto face=[&](glm::vec3 v0,glm::vec3 v1,glm::vec3 v2,glm::vec3 v3,float shade){
+            GLuint base=(GLuint)verts.size();
+            float sr=r*shade,sg=g*shade,sb=b*shade;
+            verts.push_back({v0.x,v0.y,v0.z,sr,sg,sb}); verts.push_back({v1.x,v1.y,v1.z,sr,sg,sb});
+            verts.push_back({v2.x,v2.y,v2.z,sr,sg,sb}); verts.push_back({v3.x,v3.y,v3.z,sr,sg,sb});
+            idx.insert(idx.end(),{base,base+1,base+2,base,base+2,base+3});
+        };
+        face({x0,y1,z0},{x1,y1,z0},{x1,y1,z1},{x0,y1,z1},1.0f);   // Top
+        face({x0,y0,z1},{x1,y0,z1},{x1,y0,z0},{x0,y0,z0},0.5f);   // Bottom
+        face({x0,y0,z1},{x1,y0,z1},{x1,y1,z1},{x0,y1,z1},0.8f);   // Front
+        face({x1,y0,z0},{x0,y0,z0},{x0,y1,z0},{x1,y1,z0},0.7f);   // Back
+        face({x0,y0,z0},{x0,y0,z1},{x0,y1,z1},{x0,y1,z0},0.65f);  // Left
+        face({x1,y0,z1},{x1,y0,z0},{x1,y1,z0},{x1,y1,z1},0.65f);  // Right
+    }
+
+    void build(){
+        verts.clear(); idx.clear();
+        float sk=0.90f,sg_=0.72f,sb_=0.55f;
+        float tr=0.25f,tg=0.45f,tb=0.75f;
+        float lr=0.20f,lg=0.20f,lb=0.60f;
+        float hr=0.30f,hg=0.18f,hb=0.08f;
+
+        addBox(-0.3f,1.55f,-0.3f, 0.3f,2.15f,0.3f, sk,sg_,sb_);   // Head
+        addBox(-0.32f,1.9f,-0.32f, 0.32f,2.17f,0.32f, hr,hg,hb);  // Hair
+        addBox(-0.3f,0.7f,-0.2f, 0.3f,1.5f,0.2f, tr,tg,tb);       // Body
+        addBox(-0.55f,0.7f,-0.15f, -0.32f,1.45f,0.15f, sk,sg_,sb_);// Left arm
+        addBox( 0.32f,0.7f,-0.15f,  0.55f,1.45f,0.15f, sk,sg_,sb_);// Right arm
+        addBox(-0.28f,0.0f,-0.15f, -0.05f,0.7f,0.15f, lr,lg,lb);   // Left leg
+        addBox( 0.05f,0.0f,-0.15f,  0.28f,0.7f,0.15f, lr,lg,lb);   // Right leg
+
+        indexCount=(int)idx.size();
+
+        if(!VAO){glGenVertexArrays(1,&VAO);glGenBuffers(1,&VBO);glGenBuffers(1,&EBO);}
+        glBindVertexArray(VAO);
+        glBindBuffer(GL_ARRAY_BUFFER,VBO);
+        glBufferData(GL_ARRAY_BUFFER,verts.size()*sizeof(Vertex),verts.data(),GL_STATIC_DRAW);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,EBO);
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER,idx.size()*sizeof(GLuint),idx.data(),GL_STATIC_DRAW);
+        glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),(void*)0); glEnableVertexAttribArray(0);
+        glVertexAttribPointer(1,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),(void*)(3*sizeof(float))); glEnableVertexAttribArray(1);
+        glBindVertexArray(0);
+    }
+
+    void draw(GLuint prog,GLint mvpLoc,GLint camLoc,
+              const glm::mat4& proj,const glm::mat4& view,
+              const Camera& cam) const {
+        glm::vec3 feet=cam.pos-glm::vec3(0,PH,0);
+        glm::mat4 model=glm::translate(glm::mat4(1),feet);
+        model=glm::rotate(model,glm::radians(cam.yaw+180.0f),glm::vec3(0,1,0));
+        glm::mat4 mvp=proj*view*model;
+        glUseProgram(prog);
+        glUniformMatrix4fv(mvpLoc,1,GL_FALSE,glm::value_ptr(mvp));
+        glUniform3fv(camLoc,1,glm::value_ptr(cam.pos));
+        glBindVertexArray(VAO);
+        glDrawElements(GL_TRIANGLES,(GLsizei)indexCount,GL_UNSIGNED_INT,0);
+        glBindVertexArray(0);
+    }
+};
+
+static PlayerModel PLAYER_MODEL;
+
+// ─── Raycast ─────────────────────────────────────────────────────────────────
 static bool raycast(const Camera& cam,glm::ivec3& hit,glm::ivec3& prev){
     glm::vec3 dir=cam.forward(),p=cam.pos;
     glm::ivec3 last{(int)floorf(p.x),(int)floorf(p.y),(int)floorf(p.z)};
@@ -287,24 +640,23 @@ static bool raycast(const Camera& cam,glm::ivec3& hit,glm::ivec3& prev){
     return false;
 }
 
+// ─── Chunk streaming ─────────────────────────────────────────────────────────
 static void updateChunks(int pcx,int pcz){
     for(int dx=-RENDER_DIST;dx<=RENDER_DIST;dx++)
     for(int dz=-RENDER_DIST;dz<=RENDER_DIST;dz++){
         ChunkKey k{pcx+dx,pcz+dz};
         if(CHUNKS.find(k)==CHUNKS.end()){
-            auto c=std::make_unique<Chunk>(k.x,k.z);
-            generateChunk(*c);
+            auto c=std::make_unique<Chunk>(k.x,k.z); generateChunk(*c);
             CHUNKS[k]=std::move(c);
-            for(auto& [nk,nc]:CHUNKS)
-                if(abs(nk.x-k.x)+abs(nk.z-k.z)==1) nc->meshDirty=true;
+            for(auto& [nk,nc]:CHUNKS) if(abs(nk.x-k.x)+abs(nk.z-k.z)==1) nc->meshDirty=true;
         }
     }
     std::vector<ChunkKey> toRemove;
-    for(auto& [k,c]:CHUNKS)
-        if(abs(k.x-pcx)>RENDER_DIST+1||abs(k.z-pcz)>RENDER_DIST+1) toRemove.push_back(k);
+    for(auto& [k,c]:CHUNKS) if(abs(k.x-pcx)>RENDER_DIST+1||abs(k.z-pcz)>RENDER_DIST+1) toRemove.push_back(k);
     for(auto& k:toRemove) CHUNKS.erase(k);
 }
 
+// ─── Main ────────────────────────────────────────────────────────────────────
 int main(){
     SDL_Init(SDL_INIT_VIDEO);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,3);
@@ -313,22 +665,25 @@ int main(){
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1);
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,24);
 
-    SDL_Window* win=SDL_CreateWindow("MiniCraft - Infinite World",
-        SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,SCREEN_W,SCREEN_H,SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN);
+    SDL_Window* win=SDL_CreateWindow("MiniCraft",
+        SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,SCREEN_W,SCREEN_H,
+        SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN);
     SDL_GLContext ctx=SDL_GL_CreateContext(win);
     SDL_GL_SetSwapInterval(1);
     glewExperimental=GL_TRUE; glewInit();
+
     glEnable(GL_DEPTH_TEST); glEnable(GL_CULL_FACE); glCullFace(GL_BACK);
     glClearColor(0.53f,0.81f,0.98f,1.0f);
 
-    GLuint prog=buildProgram();
-    GLint mvpLoc=glGetUniformLocation(prog,"uMVP");
-    GLint camLoc=glGetUniformLocation(prog,"uCamPos");
+    GLuint prog3d=buildProg(VS_SRC,FS_SRC);
+    GLint mvpLoc=glGetUniformLocation(prog3d,"uMVP");
+    GLint camLoc=glGetUniformLocation(prog3d,"uCamPos");
 
+    UI.init();
     initNoise(12345);
-    std::cout<<"Generating spawn chunks...\n";
+
+    std::cout<<"Generating world...\n";
     updateChunks(0,0);
-    // build all initial meshes immediately
     for(auto& [k,c]:CHUNKS) if(c->generated) buildChunkMesh(*c);
 
     Camera cam;
@@ -338,21 +693,26 @@ int main(){
     }
     cam.pos.x=0.5f; cam.pos.z=0.5f;
 
+    PLAYER_MODEL.build();
+
     glm::mat4 proj=glm::perspective(glm::radians(70.0f),(float)SCREEN_W/SCREEN_H,0.05f,500.0f);
     SDL_SetRelativeMouseMode(SDL_TRUE);
 
-    uint8_t selectedBlock=GRASS;
+    Inventory inv;
+    bool thirdPerson=false;
     bool running=true;
     Uint64 last=SDL_GetPerformanceCounter();
     int lastPcx=INT_MAX,lastPcz=INT_MAX;
 
-    std::cout<<"=== MiniCraft Infinite World ===\n"
+    std::cout<<"=== MiniCraft ===\n"
              <<"WASD        Move\n"
              <<"Space       Jump\n"
              <<"Mouse       Look\n"
-             <<"LMB         Destroy block\n"
+             <<"LMB         Break block\n"
              <<"RMB         Place block\n"
-             <<"1-8         Grass/Dirt/Stone/Wood/Leaves/Sand/Snow/Water\n"
+             <<"1-8         Hotbar slot\n"
+             <<"E           Open/close inventory\n"
+             <<"F5          Toggle 3rd person\n"
              <<"ESC         Quit\n";
 
     while(running){
@@ -366,67 +726,110 @@ int main(){
             if(e.type==SDL_QUIT) running=false;
             if(e.type==SDL_KEYDOWN){
                 switch(e.key.keysym.sym){
-                    case SDLK_ESCAPE:running=false;break;
-                    case SDLK_1:selectedBlock=GRASS;break;
-                    case SDLK_2:selectedBlock=DIRT;break;
-                    case SDLK_3:selectedBlock=STONE;break;
-                    case SDLK_4:selectedBlock=WOOD;break;
-                    case SDLK_5:selectedBlock=LEAVES;break;
-                    case SDLK_6:selectedBlock=SAND;break;
-                    case SDLK_7:selectedBlock=SNOW;break;
-                    case SDLK_8:selectedBlock=WATER;break;
+                    case SDLK_ESCAPE: running=false; break;
+                    case SDLK_e:
+                        inv.open=!inv.open;
+                        SDL_SetRelativeMouseMode(inv.open?SDL_FALSE:SDL_TRUE);
+                        break;
+                    case SDLK_F5: thirdPerson=!thirdPerson; break;
+                    case SDLK_1: inv.selected=0; break;
+                    case SDLK_2: inv.selected=1; break;
+                    case SDLK_3: inv.selected=2; break;
+                    case SDLK_4: inv.selected=3; break;
+                    case SDLK_5: inv.selected=4; break;
+                    case SDLK_6: inv.selected=5; break;
+                    case SDLK_7: inv.selected=6; break;
+                    case SDLK_8: inv.selected=7; break;
                 }
             }
-            if(e.type==SDL_MOUSEMOTION){
-                cam.yaw+=e.motion.xrel*MOUSE_SENS;
-                cam.pitch-=e.motion.yrel*MOUSE_SENS;
-                if(cam.pitch>89)cam.pitch=89; if(cam.pitch<-89)cam.pitch=-89;
+            if(e.type==SDL_MOUSEWHEEL){
+                inv.selected=(inv.selected-e.wheel.y+HOTBAR_SIZE)%HOTBAR_SIZE;
             }
-            if(e.type==SDL_MOUSEBUTTONDOWN){
-                glm::ivec3 hit,prev;
-                if(raycast(cam,hit,prev)){
-                    if(e.button.button==SDL_BUTTON_LEFT) setBlock(hit.x,hit.y,hit.z,AIR);
-                    else if(e.button.button==SDL_BUTTON_RIGHT) setBlock(prev.x,prev.y,prev.z,selectedBlock);
+            if(!inv.open){
+                if(e.type==SDL_MOUSEMOTION){
+                    cam.yaw+=e.motion.xrel*MOUSE_SENS;
+                    cam.pitch-=e.motion.yrel*MOUSE_SENS;
+                    if(cam.pitch>89)cam.pitch=89; if(cam.pitch<-89)cam.pitch=-89;
+                }
+                if(e.type==SDL_MOUSEBUTTONDOWN){
+                    glm::ivec3 hit,prev;
+                    if(raycast(cam,hit,prev)){
+                        if(e.button.button==SDL_BUTTON_LEFT)
+                            setBlock(hit.x,hit.y,hit.z,AIR);
+                        else if(e.button.button==SDL_BUTTON_RIGHT)
+                            setBlock(prev.x,prev.y,prev.z,inv.selectedBlock());
+                    }
+                }
+            } else {
+                if(e.type==SDL_MOUSEBUTTONDOWN&&e.button.button==SDL_BUTTON_LEFT){
+                    const int COLS=4; const float SLOT=52.0f,GAP=6.0f;
+                    float iw=COLS*(SLOT+GAP)-GAP+32.0f;
+                    float ih=((NUM_BLOCK_TYPES-1+COLS-1)/COLS)*(SLOT+GAP)-GAP+60.0f;
+                    float ix=(SCREEN_W-iw)*0.5f,iy=(SCREEN_H-ih)*0.5f;
+                    int mx=e.button.x,my=e.button.y;
+                    for(int bi=1;bi<NUM_BLOCK_TYPES;bi++){
+                        int row=(bi-1)/COLS,col=(bi-1)%COLS;
+                        float sx=ix+16+col*(SLOT+GAP),sy=iy+40+row*(SLOT+GAP);
+                        if(mx>=sx&&mx<=sx+SLOT&&my>=sy&&my<=sy+SLOT){
+                            inv.hotbar[inv.selected]=(uint8_t)bi;
+                        }
+                    }
                 }
             }
         }
 
-        const Uint8* keys=SDL_GetKeyboardState(nullptr);
-        glm::vec3 fwd=cam.forward(); fwd.y=0; if(glm::length(fwd)>0) fwd=glm::normalize(fwd);
-        glm::vec3 rgt=cam.right();   rgt.y=0; if(glm::length(rgt)>0) rgt=glm::normalize(rgt);
-        glm::vec3 move{0,0,0};
-        if(keys[SDL_SCANCODE_W]) move+=fwd*MOVE_SPEED;
-        if(keys[SDL_SCANCODE_S]) move-=fwd*MOVE_SPEED;
-        if(keys[SDL_SCANCODE_D]) move+=rgt*MOVE_SPEED;
-        if(keys[SDL_SCANCODE_A]) move-=rgt*MOVE_SPEED;
-        if(keys[SDL_SCANCODE_SPACE]&&cam.onGround) cam.vel.y=JUMP_VEL;
-        moveCamera(cam,move,dt);
+        if(!inv.open){
+            const Uint8* keys=SDL_GetKeyboardState(nullptr);
+            glm::vec3 fwd=cam.forward(); fwd.y=0; if(glm::length(fwd)>0) fwd=glm::normalize(fwd);
+            glm::vec3 rgt=cam.right();   rgt.y=0; if(glm::length(rgt)>0) rgt=glm::normalize(rgt);
+            glm::vec3 move{0,0,0};
+            if(keys[SDL_SCANCODE_W]) move+=fwd*MOVE_SPEED;
+            if(keys[SDL_SCANCODE_S]) move-=fwd*MOVE_SPEED;
+            if(keys[SDL_SCANCODE_D]) move+=rgt*MOVE_SPEED;
+            if(keys[SDL_SCANCODE_A]) move-=rgt*MOVE_SPEED;
+            if(keys[SDL_SCANCODE_SPACE]&&cam.onGround) cam.vel.y=JUMP_VEL;
+            moveCamera(cam,move,dt);
+        }
 
         int pcx=(int)floorf(cam.pos.x/CHUNK_SIZE);
         int pcz=(int)floorf(cam.pos.z/CHUNK_SIZE);
-        if(pcx!=lastPcx||pcz!=lastPcz){
-            updateChunks(pcx,pcz); lastPcx=pcx; lastPcz=pcz;
-        }
-
+        if(pcx!=lastPcx||pcz!=lastPcz){ updateChunks(pcx,pcz); lastPcx=pcx; lastPcz=pcz; }
         int rebuilt=0;
         for(auto& [k,c]:CHUNKS)
             if(c->meshDirty&&c->generated){buildChunkMesh(*c);if(++rebuilt>=4)break;}
 
+        // ── Render 3D world ──
         glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
-        glUseProgram(prog);
-        glm::mat4 mvp=proj*cam.view();
+        glm::mat4 view=thirdPerson?cam.thirdPersonView():cam.firstPersonView();
+        glm::mat4 mvp=proj*view;
+
+        glUseProgram(prog3d);
         glUniformMatrix4fv(mvpLoc,1,GL_FALSE,glm::value_ptr(mvp));
         glUniform3fv(camLoc,1,glm::value_ptr(cam.pos));
         for(auto& [k,c]:CHUNKS)
             if(c->indexCount>0){glBindVertexArray(c->VAO);glDrawElements(GL_TRIANGLES,c->indexCount,GL_UNSIGNED_INT,0);}
 
+        // ── Player model (3rd person only) ──
+        if(thirdPerson)
+            PLAYER_MODEL.draw(prog3d,mvpLoc,camLoc,proj,view,cam);
+
+        // ── 2D UI ──
+        UI.begin();
+        drawHUD(cam.pos,inv.selectedBlock(),thirdPerson);
+        drawInventory(inv);
+        UI.end();
+
         SDL_GL_SwapWindow(win);
     }
 
     CHUNKS.clear();
-    glDeleteProgram(prog);
+    glDeleteProgram(prog3d);
+    glDeleteProgram(UI.prog);
+    glDeleteVertexArrays(1,&UI.VAO); glDeleteBuffers(1,&UI.VBO);
+    glDeleteVertexArrays(1,&PLAYER_MODEL.VAO);
+    glDeleteBuffers(1,&PLAYER_MODEL.VBO); glDeleteBuffers(1,&PLAYER_MODEL.EBO);
     SDL_GL_DeleteContext(ctx);
     SDL_DestroyWindow(win);
     SDL_Quit();
     return 0;
-}
+}
\ No newline at end of file