commit 7232d4cc37f615fb3a89442ed64bd0bc2dce5484
Author: Fam Zheng <fam@euphon.net>
Date:   Mon Apr 6 13:30:12 2026 +0100

    Initial commit: repo-vis — 3D codebase visualization
    
    Rust (axum) backend with git clone / zip upload / SQLite cache.
    Three.js frontend with D3 treemap layout and semantic zoom.
    Docker deployment with musl static binary.

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..feab7a9
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,13 @@
+# Keep the musl release binary, ignore the rest
+server/target/debug
+server/target/release
+server/target/x86_64-unknown-linux-musl/debug
+server/target/x86_64-unknown-linux-musl/release/build
+server/target/x86_64-unknown-linux-musl/release/deps
+server/target/x86_64-unknown-linux-musl/release/.fingerprint
+server/target/x86_64-unknown-linux-musl/release/incremental
+server/target/x86_64-unknown-linux-musl/release/examples
+web/node_modules
+web/dist
+*.db
+data/
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a55268e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+server/target/
+web/node_modules/
+web/dist/
+data/
+*.db
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..afb33d1
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,21 @@
+# Stage 1: Build frontend
+FROM node:22-slim AS frontend
+WORKDIR /build
+COPY web/package.json web/package-lock.json ./
+RUN npm ci
+COPY web/ ./
+RUN npm run build
+
+# Stage 2: Minimal runtime (binary built locally with musl)
+FROM alpine:3.21
+RUN apk add --no-cache git ca-certificates
+
+WORKDIR /app
+COPY server/target/x86_64-unknown-linux-musl/release/repo-vis-server ./
+COPY --from=frontend /build/dist ./web/dist/
+
+ENV PORT=8080
+ENV FRONTEND_DIR=./web/dist
+EXPOSE 8080
+
+CMD ["./repo-vis-server"]
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1d0bd99
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,30 @@
+.PHONY: build-server build-web build deploy clean
+
+MUSL_TARGET := x86_64-unknown-linux-musl
+CONTAINER := repo-vis
+IMAGE := repo-vis:latest
+PORT := 9120
+
+build-server:
+	cd server && cargo build --release --target $(MUSL_TARGET)
+
+build-web:
+	cd web && npm run build
+
+build: build-server build-web
+
+deploy: build
+	-docker stop $(CONTAINER) 2>/dev/null
+	-docker rm $(CONTAINER) 2>/dev/null
+	docker build -t $(IMAGE) .
+	docker run -d \
+		--name $(CONTAINER) \
+		-p $(PORT):8080 \
+		-v repo-vis-data:/app/data \
+		--restart unless-stopped \
+		$(IMAGE)
+	@echo "repo-vis running at http://localhost:$(PORT)"
+
+clean:
+	cd server && cargo clean
+	rm -rf web/dist
diff --git a/server/Cargo.lock b/server/Cargo.lock
new file mode 100644
index 0000000..7750b93
--- /dev/null
+++ b/server/Cargo.lock
@@ -0,0 +1,1751 @@
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+# It is not intended for manual editing.
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+checksum = "91e19ebc2adc8f83e43039e79776e3fda8ca919132d68a1fed6a5faca2683748"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/server/Cargo.toml b/server/Cargo.toml
new file mode 100644
index 0000000..c5a170e
--- /dev/null
+++ b/server/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "repo-vis-server"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = { version = "0.8", features = ["multipart"] }
+tokio = { version = "1", features = ["full"] }
+tower-http = { version = "0.6", features = ["fs", "cors"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+rusqlite = { version = "0.32", features = ["bundled"] }
+walkdir = "2"
+sha2 = "0.10"
+hex = "0.4"
+zip = "2"
+tempfile = "3"
+tracing = "0.1"
+tracing-subscriber = "0.3"
diff --git a/server/src/cache.rs b/server/src/cache.rs
new file mode 100644
index 0000000..f061c45
--- /dev/null
+++ b/server/src/cache.rs
@@ -0,0 +1,131 @@
+use rusqlite::Connection;
+use serde::Serialize;
+use sha2::{Digest, Sha256};
+use std::path::Path;
+use std::sync::Mutex;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+const TTL_SECS: u64 = 24 * 60 * 60; // 24 hours
+
+#[derive(Debug, Serialize)]
+pub struct RepoEntry {
+    pub name: String,
+    pub source: String, // "git:url" or "zip:filename"
+    pub file_count: usize,
+    pub cache_key: String,
+    pub created: u64,
+}
+
+pub struct Cache {
+    conn: Mutex<Connection>,
+}
+
+impl Cache {
+    pub fn new(db_path: &Path) -> Self {
+        if let Some(parent) = db_path.parent() {
+            std::fs::create_dir_all(parent).ok();
+        }
+
+        let conn = Connection::open(db_path).expect("Failed to open cache database");
+        conn.execute_batch(
+            "CREATE TABLE IF NOT EXISTS scan_cache (
+                key     TEXT PRIMARY KEY,
+                data    TEXT NOT NULL,
+                created INTEGER NOT NULL
+            );
+            CREATE TABLE IF NOT EXISTS repos (
+                cache_key  TEXT PRIMARY KEY,
+                name       TEXT NOT NULL,
+                source     TEXT NOT NULL,
+                file_count INTEGER NOT NULL DEFAULT 0,
+                created    INTEGER NOT NULL
+            );",
+        )
+        .expect("Failed to create tables");
+
+        Cache {
+            conn: Mutex::new(conn),
+        }
+    }
+
+    pub fn make_key(input: &str) -> String {
+        let mut hasher = Sha256::new();
+        hasher.update(input.as_bytes());
+        hex::encode(hasher.finalize())
+    }
+
+    pub fn get(&self, key: &str) -> Option<String> {
+        let conn = self.conn.lock().unwrap();
+        let now = now_secs();
+
+        // Prune old entries
+        conn.execute(
+            "DELETE FROM scan_cache WHERE created < ?1",
+            [now.saturating_sub(TTL_SECS)],
+        )
+        .ok();
+
+        conn.query_row(
+            "SELECT data, created FROM scan_cache WHERE key = ?1",
+            [key],
+            |row| {
+                let data: String = row.get(0)?;
+                let created: u64 = row.get(1)?;
+                Ok((data, created))
+            },
+        )
+        .ok()
+        .and_then(|(data, created)| {
+            if now - created < TTL_SECS {
+                Some(data)
+            } else {
+                None
+            }
+        })
+    }
+
+    pub fn set(&self, key: &str, data: &str) {
+        let conn = self.conn.lock().unwrap();
+        conn.execute(
+            "INSERT OR REPLACE INTO scan_cache (key, data, created) VALUES (?1, ?2, ?3)",
+            rusqlite::params![key, data, now_secs()],
+        )
+        .ok();
+    }
+
+    pub fn record_repo(&self, cache_key: &str, name: &str, source: &str, file_count: usize) {
+        let conn = self.conn.lock().unwrap();
+        conn.execute(
+            "INSERT OR REPLACE INTO repos (cache_key, name, source, file_count, created) VALUES (?1, ?2, ?3, ?4, ?5)",
+            rusqlite::params![cache_key, name, source, file_count, now_secs()],
+        )
+        .ok();
+    }
+
+    pub fn list_repos(&self) -> Vec<RepoEntry> {
+        let conn = self.conn.lock().unwrap();
+        let mut stmt = conn
+            .prepare("SELECT cache_key, name, source, file_count, created FROM repos ORDER BY created DESC LIMIT 50")
+            .unwrap();
+
+        stmt.query_map([], |row| {
+            Ok(RepoEntry {
+                cache_key: row.get(0)?,
+                name: row.get(1)?,
+                source: row.get(2)?,
+                file_count: row.get(3)?,
+                created: row.get(4)?,
+            })
+        })
+        .unwrap()
+        .filter_map(|r| r.ok())
+        .collect()
+    }
+}
+
+fn now_secs() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_secs()
+}
diff --git a/server/src/main.rs b/server/src/main.rs
new file mode 100644
index 0000000..ff5d280
--- /dev/null
+++ b/server/src/main.rs
@@ -0,0 +1,213 @@
+mod cache;
+mod scanner;
+
+use axum::{
+    extract::{DefaultBodyLimit, Multipart, Path, State},
+    http::StatusCode,
+    response::Json,
+    routing::{get, post},
+    Router,
+};
+use cache::{Cache, RepoEntry};
+use scanner::{scan_dir, FileNode};
+use serde::Deserialize;
+use sha2::{Digest, Sha256};
+use std::process::Command;
+use std::sync::Arc;
+use tempfile::TempDir;
+use tower_http::services::ServeDir;
+use tracing::info;
+
+struct AppState {
+    cache: Cache,
+}
+
+#[derive(Deserialize)]
+struct GitRequest {
+    url: String,
+}
+
+fn count_leaves(node: &FileNode) -> usize {
+    match &node.children {
+        Some(children) => children.iter().map(count_leaves).sum(),
+        None => 1,
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    tracing_subscriber::fmt::init();
+
+    let data_dir_str = std::env::var("DATA_DIR").unwrap_or_else(|_| "data".to_string());
+    let data_dir = std::path::Path::new(&data_dir_str);
+    std::fs::create_dir_all(data_dir).ok();
+
+    let state = Arc::new(AppState {
+        cache: Cache::new(&data_dir.join("cache.db")),
+    });
+
+    let frontend_dir_str =
+        std::env::var("FRONTEND_DIR").unwrap_or_else(|_| "../web/dist".to_string());
+    let frontend_dir = std::path::Path::new(&frontend_dir_str);
+
+    let app = Router::new()
+        .route("/api/scan-git", post(scan_git))
+        .route("/api/scan-zip", post(scan_zip))
+        .route("/api/repos", get(list_repos))
+        .route("/api/repos/{key}", get(get_repo))
+        .layer(DefaultBodyLimit::max(100 * 1024 * 1024))
+        .with_state(state)
+        .fallback_service(ServeDir::new(frontend_dir).append_index_html_on_directories(true));
+
+    let port = std::env::var("PORT").unwrap_or_else(|_| "3000".to_string());
+    let addr = format!("0.0.0.0:{port}");
+    info!("repo-vis server running at http://localhost:{port}");
+
+    let listener = tokio::net::TcpListener::bind(&addr).await.unwrap();
+    axum::serve(listener, app).await.unwrap();
+}
+
+async fn list_repos(
+    State(state): State<Arc<AppState>>,
+) -> Json<Vec<RepoEntry>> {
+    Json(state.cache.list_repos())
+}
+
+async fn get_repo(
+    State(state): State<Arc<AppState>>,
+    Path(key): Path<String>,
+) -> Result<Json<FileNode>, (StatusCode, String)> {
+    state
+        .cache
+        .get(&key)
+        .and_then(|data| serde_json::from_str(&data).ok())
+        .map(Json)
+        .ok_or((StatusCode::NOT_FOUND, "Repo not found in cache".to_string()))
+}
+
+async fn scan_git(
+    State(state): State<Arc<AppState>>,
+    Json(req): Json<GitRequest>,
+) -> Result<Json<FileNode>, (StatusCode, String)> {
+    let url = req.url.trim().to_string();
+
+    if !url.starts_with("http://")
+        && !url.starts_with("https://")
+        && !url.starts_with("git@")
+    {
+        return Err((StatusCode::BAD_REQUEST, "Invalid git URL".to_string()));
+    }
+
+    // Check cache
+    let key = Cache::make_key(&format!("git:{url}"));
+    if let Some(cached) = state.cache.get(&key) {
+        info!("Cache hit for {url}");
+        let tree: FileNode =
+            serde_json::from_str(&cached).map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+        return Ok(Json(tree));
+    }
+
+    // Clone into temp dir
+    let tmp = TempDir::new().map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+
+    info!("Cloning {url} ...");
+    let output = Command::new("git")
+        .args(["clone", "--depth", "1", "--", &url])
+        .arg(tmp.path())
+        .output()
+        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("git clone failed: {e}")))?;
+
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        return Err((
+            StatusCode::INTERNAL_SERVER_ERROR,
+            format!("git clone failed: {stderr}"),
+        ));
+    }
+
+    let mut tree = scan_dir(tmp.path(), tmp.path());
+
+    let repo_name = url
+        .trim_end_matches('/')
+        .trim_end_matches(".git")
+        .rsplit('/')
+        .next()
+        .unwrap_or("repo")
+        .to_string();
+    tree.name = repo_name.clone();
+
+    let file_count = count_leaves(&tree);
+
+    if let Ok(json_str) = serde_json::to_string(&tree) {
+        state.cache.set(&key, &json_str);
+        state.cache.record_repo(&key, &repo_name, &url, file_count);
+    }
+
+    Ok(Json(tree))
+}
+
+async fn scan_zip(
+    State(state): State<Arc<AppState>>,
+    mut multipart: Multipart,
+) -> Result<Json<FileNode>, (StatusCode, String)> {
+    let field = multipart
+        .next_field()
+        .await
+        .map_err(|e| (StatusCode::BAD_REQUEST, e.to_string()))?
+        .ok_or((StatusCode::BAD_REQUEST, "No file uploaded".to_string()))?;
+
+    let file_name = field
+        .file_name()
+        .unwrap_or("upload.zip")
+        .to_string();
+
+    let data = field
+        .bytes()
+        .await
+        .map_err(|e| (StatusCode::BAD_REQUEST, format!("Failed to read upload: {e}")))?;
+
+    let mut hasher = Sha256::new();
+    hasher.update(&data);
+    let hash = hex::encode(hasher.finalize());
+    let key = Cache::make_key(&format!("zip:{hash}"));
+
+    if let Some(cached) = state.cache.get(&key) {
+        info!("Cache hit for zip {file_name}");
+        let tree: FileNode =
+            serde_json::from_str(&cached).map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+        return Ok(Json(tree));
+    }
+
+    let tmp = TempDir::new().map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+    let cursor = std::io::Cursor::new(&data);
+    let mut archive =
+        zip::ZipArchive::new(cursor).map_err(|e| (StatusCode::BAD_REQUEST, format!("Invalid zip: {e}")))?;
+
+    archive
+        .extract(tmp.path())
+        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("Extract failed: {e}")))?;
+
+    let entries: Vec<_> = std::fs::read_dir(tmp.path())
+        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?
+        .filter_map(|e| e.ok())
+        .collect();
+
+    let scan_root = if entries.len() == 1 && entries[0].file_type().map(|t| t.is_dir()).unwrap_or(false) {
+        entries[0].path()
+    } else {
+        tmp.path().to_path_buf()
+    };
+
+    let mut tree = scan_dir(&scan_root, &scan_root);
+    let zip_name = file_name.trim_end_matches(".zip").to_string();
+    tree.name = zip_name.clone();
+
+    let file_count = count_leaves(&tree);
+
+    if let Ok(json_str) = serde_json::to_string(&tree) {
+        state.cache.set(&key, &json_str);
+        state.cache.record_repo(&key, &zip_name, &format!("zip:{file_name}"), file_count);
+    }
+
+    Ok(Json(tree))
+}
diff --git a/server/src/scanner.rs b/server/src/scanner.rs
new file mode 100644
index 0000000..b3b5f66
--- /dev/null
+++ b/server/src/scanner.rs
@@ -0,0 +1,172 @@
+use serde::{Deserialize, Serialize};
+use std::collections::HashSet;
+use std::fs;
+use std::path::Path;
+
+const MAX_FILE_SIZE: u64 = 256 * 1024;
+
+static IGNORE_DIRS: &[&str] = &[
+    "node_modules", ".git", ".hg", ".svn", "dist", "build", "__pycache__",
+    ".next", ".nuxt", ".output", "vendor", ".venv", "venv", "target",
+    ".idea", ".vscode", ".cache",
+];
+
+static TEXT_EXTENSIONS: &[&str] = &[
+    "js", "jsx", "ts", "tsx", "mjs", "cjs", "py", "pyw", "go", "rs", "c", "h", "cpp", "hpp",
+    "cc", "java", "kt", "scala", "rb", "php", "lua", "pl", "pm", "sh", "bash", "zsh", "fish",
+    "html", "htm", "css", "scss", "less", "sass", "json", "yaml", "yml", "toml", "ini", "cfg",
+    "xml", "svg", "md", "txt", "rst", "sql", "graphql", "gql", "vue", "svelte", "astro", "tf",
+    "hcl", "proto", "thrift", "r", "jl", "ex", "exs", "erl", "hrl", "zig", "nim", "v",
+    "swift", "m", "mm", "cs", "fs", "fsx", "hs", "lhs", "ml", "mli", "clj", "cljs", "cljc",
+    "edn", "el", "lisp", "scm", "rkt", "cmake",
+];
+
+static SPECIAL_NAMES: &[&str] = &[
+    "Makefile", "Dockerfile", "Containerfile", "Vagrantfile", "Rakefile", "Gemfile",
+    "Brewfile", "Procfile", "CMakeLists.txt", "meson.build", "BUILD", "WORKSPACE",
+    ".gitignore", ".dockerignore", ".editorconfig", ".env.example",
+];
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct FileNode {
+    pub name: String,
+    pub path: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub lines: Option<usize>,
+    #[serde(rename = "maxLen", skip_serializing_if = "Option::is_none")]
+    pub max_len: Option<usize>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub content: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub children: Option<Vec<FileNode>>,
+}
+
+fn is_text_file(name: &str, ext: Option<&str>) -> bool {
+    if SPECIAL_NAMES.contains(&name) {
+        return true;
+    }
+    match ext {
+        Some(e) => {
+            let lower = e.to_ascii_lowercase();
+            TEXT_EXTENSIONS.contains(&lower.as_str())
+        }
+        None => false,
+    }
+}
+
+pub fn scan_dir(dir: &Path, root: &Path) -> FileNode {
+    let ignore_set: HashSet<&str> = IGNORE_DIRS.iter().copied().collect();
+    let mut children = Vec::new();
+
+    let entries = match fs::read_dir(dir) {
+        Ok(e) => e,
+        Err(_) => {
+            return FileNode {
+                name: dir_name(dir),
+                path: rel_path(dir, root),
+                lines: None,
+                max_len: None,
+                content: None,
+                children: Some(Vec::new()),
+            };
+        }
+    };
+
+    let mut sorted: Vec<_> = entries.filter_map(|e| e.ok()).collect();
+    sorted.sort_by(|a, b| a.file_name().cmp(&b.file_name()));
+
+    for entry in sorted {
+        let name = entry.file_name();
+        let name_str = name.to_string_lossy();
+
+        if ignore_set.contains(name_str.as_ref()) {
+            continue;
+        }
+
+        let path = entry.path();
+        let ft = match entry.file_type() {
+            Ok(ft) => ft,
+            Err(_) => continue,
+        };
+
+        if ft.is_dir() {
+            let subtree = scan_dir(&path, root);
+            if subtree
+                .children
+                .as_ref()
+                .map(|c| !c.is_empty())
+                .unwrap_or(false)
+            {
+                children.push(subtree);
+            }
+        } else if ft.is_file() {
+            let ext = path.extension().and_then(|e| e.to_str());
+            if !is_text_file(&name_str, ext) {
+                continue;
+            }
+
+            let meta = match fs::metadata(&path) {
+                Ok(m) => m,
+                Err(_) => continue,
+            };
+
+            if meta.len() == 0 || meta.len() > MAX_FILE_SIZE {
+                continue;
+            }
+
+            let content = match fs::read_to_string(&path) {
+                Ok(c) => c,
+                Err(_) => continue, // binary or encoding error
+            };
+
+            let lines: Vec<&str> = content.split('\n').collect();
+            let line_count = lines.len();
+            // P99 line length to avoid outlier long lines distorting layout
+            let max_len = percentile_line_len(&lines, 99).max(1);
+
+            children.push(FileNode {
+                name: name_str.to_string(),
+                path: rel_path(&path, root),
+                lines: Some(line_count),
+                max_len: Some(max_len),
+                content: Some(content),
+                children: None,
+            });
+        }
+    }
+
+    FileNode {
+        name: dir_name(dir),
+        path: rel_path(dir, root),
+        lines: None,
+        max_len: None,
+        content: None,
+        children: Some(children),
+    }
+}
+
+fn percentile_line_len(lines: &[&str], pct: usize) -> usize {
+    if lines.is_empty() {
+        return 0;
+    }
+    let mut lens: Vec<usize> = lines.iter().map(|l| l.len()).collect();
+    lens.sort_unstable();
+    let idx = (lens.len() * pct / 100).min(lens.len() - 1);
+    lens[idx]
+}
+
+fn dir_name(dir: &Path) -> String {
+    dir.file_name()
+        .and_then(|n| n.to_str())
+        .unwrap_or(".")
+        .to_string()
+}
+
+fn rel_path(path: &Path, root: &Path) -> String {
+    path.strip_prefix(root)
+        .map(|p| {
+            let s = p.to_string_lossy().to_string();
+            if s.is_empty() { ".".to_string() } else { s }
+        })
+        .unwrap_or_else(|_| ".".to_string())
+}
diff --git a/web/index.html b/web/index.html
new file mode 100644
index 0000000..83effca
--- /dev/null
+++ b/web/index.html
@@ -0,0 +1,288 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>repo-vis</title>
+  <!-- Terminus (code) + LXGW WenKai Mono (CJK) -->
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@xz/fonts@1/serve/terminus.min.css">
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/lxgw-wenkai-mono-webfont@1.7.0/style.css">
+  <style>
+    * { margin: 0; padding: 0; box-sizing: border-box; }
+
+    body {
+      font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
+      background: #11111b;
+      color: #cdd6f4;
+      overflow: hidden;
+    }
+
+    /* Landing page */
+    #landing {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      justify-content: center;
+      height: 100vh;
+      gap: 32px;
+    }
+
+    #landing h1 {
+      font-size: 48px;
+      font-weight: 300;
+      letter-spacing: -1px;
+      color: #cba6f7;
+    }
+
+    #landing .subtitle {
+      font-size: 16px;
+      color: #6c7086;
+      margin-top: -20px;
+    }
+
+    .input-group {
+      display: flex;
+      flex-direction: column;
+      gap: 16px;
+      width: 500px;
+      max-width: 90vw;
+    }
+
+    .input-row {
+      display: flex;
+      gap: 8px;
+    }
+
+    .input-row input[type="text"] {
+      flex: 1;
+      padding: 12px 16px;
+      border: 1px solid #313244;
+      border-radius: 8px;
+      background: #1e1e2e;
+      color: #cdd6f4;
+      font-size: 15px;
+      outline: none;
+      transition: border-color 0.2s;
+    }
+
+    .input-row input[type="text"]:focus {
+      border-color: #cba6f7;
+    }
+
+    .input-row input[type="text"]::placeholder {
+      color: #585b70;
+    }
+
+    button {
+      padding: 12px 24px;
+      border: none;
+      border-radius: 8px;
+      background: #cba6f7;
+      color: #1e1e2e;
+      font-size: 15px;
+      font-weight: 600;
+      cursor: pointer;
+      transition: background 0.2s;
+    }
+
+    button:hover { background: #b4befe; }
+    button:disabled { opacity: 0.5; cursor: not-allowed; }
+
+    .divider {
+      display: flex;
+      align-items: center;
+      gap: 16px;
+      color: #585b70;
+      font-size: 13px;
+    }
+
+    .divider::before, .divider::after {
+      content: "";
+      flex: 1;
+      height: 1px;
+      background: #313244;
+    }
+
+    .drop-zone {
+      border: 2px dashed #313244;
+      border-radius: 12px;
+      padding: 32px;
+      text-align: center;
+      color: #6c7086;
+      cursor: pointer;
+      transition: border-color 0.2s, background 0.2s;
+    }
+
+    .drop-zone:hover, .drop-zone.dragover {
+      border-color: #cba6f7;
+      background: rgba(203, 166, 247, 0.05);
+    }
+
+    .drop-zone input { display: none; }
+
+    /* Loading state */
+    #loading {
+      display: none;
+      position: fixed;
+      inset: 0;
+      background: #11111b;
+      z-index: 100;
+      flex-direction: column;
+      align-items: center;
+      justify-content: center;
+      gap: 16px;
+    }
+
+    #loading.active { display: flex; }
+
+    .spinner {
+      width: 40px;
+      height: 40px;
+      border: 3px solid #313244;
+      border-top-color: #cba6f7;
+      border-radius: 50%;
+      animation: spin 0.8s linear infinite;
+    }
+
+    @keyframes spin { to { transform: rotate(360deg); } }
+
+    #loading-text { color: #6c7086; font-size: 14px; }
+
+    /* Visualization */
+    #viewport {
+      display: none;
+      width: 100vw;
+      height: 100vh;
+    }
+
+    #viewport.active { display: block; }
+
+    /* Tooltip */
+    #tooltip {
+      display: none;
+      position: fixed;
+      bottom: 16px;
+      left: 50%;
+      transform: translateX(-50%);
+      padding: 8px 16px;
+      background: rgba(30, 30, 46, 0.9);
+      backdrop-filter: blur(8px);
+      border: 1px solid #313244;
+      border-radius: 8px;
+      font-size: 13px;
+      font-family: Terminus, "LXGW WenKai Mono", monospace;
+      color: #cdd6f4;
+      pointer-events: none;
+      z-index: 50;
+      white-space: nowrap;
+    }
+
+    /* Controls hint */
+    #controls-hint {
+      position: fixed;
+      top: 16px;
+      right: 16px;
+      padding: 8px 12px;
+      background: rgba(30, 30, 46, 0.8);
+      border: 1px solid #313244;
+      border-radius: 8px;
+      font-size: 12px;
+      color: #585b70;
+      line-height: 1.6;
+      z-index: 50;
+      display: none;
+    }
+
+    #controls-hint.active { display: block; }
+
+    /* History */
+    #history {
+      display: none;
+      width: 500px;
+      max-width: 90vw;
+      margin-top: 8px;
+    }
+
+    #history.has-items { display: block; }
+
+    #history h3 {
+      font-size: 13px;
+      font-weight: 500;
+      color: #585b70;
+      margin-bottom: 8px;
+      text-transform: uppercase;
+      letter-spacing: 1px;
+    }
+
+    .history-list {
+      display: flex;
+      flex-direction: column;
+      gap: 4px;
+    }
+
+    .history-item {
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+      padding: 10px 14px;
+      background: #1e1e2e;
+      border: 1px solid #313244;
+      border-radius: 8px;
+      cursor: pointer;
+      transition: border-color 0.2s;
+    }
+
+    .history-item:hover { border-color: #cba6f7; }
+
+    .history-item .name {
+      font-size: 14px;
+      font-weight: 500;
+      color: #cdd6f4;
+    }
+
+    .history-item .meta {
+      font-size: 12px;
+      color: #585b70;
+    }
+  </style>
+</head>
+<body>
+
+  <div id="landing">
+    <h1>repo-vis</h1>
+    <p class="subtitle">Visualize any codebase in 3D</p>
+
+    <div class="input-group">
+      <div class="input-row">
+        <input type="text" id="git-url" placeholder="https://github.com/user/repo">
+        <button id="btn-clone">Clone & Visualize</button>
+      </div>
+
+      <div class="divider">or</div>
+
+      <div class="drop-zone" id="drop-zone">
+        <p>Drop a .zip file here, or click to browse</p>
+        <input type="file" id="file-input" accept=".zip">
+      </div>
+    </div>
+
+    <div id="history">
+      <h3>Recent</h3>
+      <div class="history-list" id="history-list"></div>
+    </div>
+  </div>
+
+  <div id="loading">
+    <div class="spinner"></div>
+    <div id="loading-text">Cloning repository...</div>
+  </div>
+
+  <div id="viewport"></div>
+  <div id="tooltip"></div>
+  <div id="controls-hint">
+    LMB drag — rotate &nbsp;|&nbsp; RMB drag — pan &nbsp;|&nbsp; scroll — zoom &nbsp;|&nbsp; double-click — focus file
+  </div>
+
+  <script type="module" src="/src/app.js"></script>
+</body>
+</html>
diff --git a/web/package-lock.json b/web/package-lock.json
new file mode 100644
index 0000000..afe9c33
--- /dev/null
+++ b/web/package-lock.json
@@ -0,0 +1,1058 @@
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+      "name": "repo-vis-web",
+      "version": "0.1.0",
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+        "d3-hierarchy": "^3.1.2",
+        "three": "^0.170.0"
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+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/postcss"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "dependencies": {
+        "nanoid": "^3.3.11",
+        "picocolors": "^1.1.1",
+        "source-map-js": "^1.2.1"
+      },
+      "engines": {
+        "node": "^10 || ^12 || >=14"
+      }
+    },
+    "node_modules/rollup": {
+      "version": "4.60.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.60.1.tgz",
+      "integrity": "sha512-VmtB2rFU/GroZ4oL8+ZqXgSA38O6GR8KSIvWmEFv63pQ0G6KaBH9s07PO8XTXP4vI+3UJUEypOfjkGfmSBBR0w==",
+      "dev": true,
+      "dependencies": {
+        "@types/estree": "1.0.8"
+      },
+      "bin": {
+        "rollup": "dist/bin/rollup"
+      },
+      "engines": {
+        "node": ">=18.0.0",
+        "npm": ">=8.0.0"
+      },
+      "optionalDependencies": {
+        "@rollup/rollup-android-arm-eabi": "4.60.1",
+        "@rollup/rollup-android-arm64": "4.60.1",
+        "@rollup/rollup-darwin-arm64": "4.60.1",
+        "@rollup/rollup-darwin-x64": "4.60.1",
+        "@rollup/rollup-freebsd-arm64": "4.60.1",
+        "@rollup/rollup-freebsd-x64": "4.60.1",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.60.1",
+        "@rollup/rollup-linux-arm-musleabihf": "4.60.1",
+        "@rollup/rollup-linux-arm64-gnu": "4.60.1",
+        "@rollup/rollup-linux-arm64-musl": "4.60.1",
+        "@rollup/rollup-linux-loong64-gnu": "4.60.1",
+        "@rollup/rollup-linux-loong64-musl": "4.60.1",
+        "@rollup/rollup-linux-ppc64-gnu": "4.60.1",
+        "@rollup/rollup-linux-ppc64-musl": "4.60.1",
+        "@rollup/rollup-linux-riscv64-gnu": "4.60.1",
+        "@rollup/rollup-linux-riscv64-musl": "4.60.1",
+        "@rollup/rollup-linux-s390x-gnu": "4.60.1",
+        "@rollup/rollup-linux-x64-gnu": "4.60.1",
+        "@rollup/rollup-linux-x64-musl": "4.60.1",
+        "@rollup/rollup-openbsd-x64": "4.60.1",
+        "@rollup/rollup-openharmony-arm64": "4.60.1",
+        "@rollup/rollup-win32-arm64-msvc": "4.60.1",
+        "@rollup/rollup-win32-ia32-msvc": "4.60.1",
+        "@rollup/rollup-win32-x64-gnu": "4.60.1",
+        "@rollup/rollup-win32-x64-msvc": "4.60.1",
+        "fsevents": "~2.3.2"
+      }
+    },
+    "node_modules/source-map-js": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/three": {
+      "version": "0.170.0",
+      "resolved": "https://registry.npmjs.org/three/-/three-0.170.0.tgz",
+      "integrity": "sha512-FQK+LEpYc0fBD+J8g6oSEyyNzjp+Q7Ks1C568WWaoMRLW+TkNNWmenWeGgJjV105Gd+p/2ql1ZcjYvNiPZBhuQ=="
+    },
+    "node_modules/tinyglobby": {
+      "version": "0.2.15",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
+      "integrity": "sha512-j2Zq4NyQYG5XMST4cbs02Ak8iJUdxRM0XI5QyxXuZOzKOINmWurp3smXu3y5wDcJrptwpSjgXHzIQxR0omXljQ==",
+      "dev": true,
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
+    "node_modules/vite": {
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.2.tgz",
+      "integrity": "sha512-2N/55r4JDJ4gdrCvGgINMy+HH3iRpNIz8K6SFwVsA+JbQScLiC+clmAxBgwiSPgcG9U15QmvqCGWzMbqda5zGQ==",
+      "dev": true,
+      "dependencies": {
+        "esbuild": "^0.25.0",
+        "fdir": "^6.4.4",
+        "picomatch": "^4.0.2",
+        "postcss": "^8.5.3",
+        "rollup": "^4.34.9",
+        "tinyglobby": "^0.2.13"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "jiti": ">=1.21.0",
+        "less": "*",
+        "lightningcss": "^1.21.0",
+        "sass": "*",
+        "sass-embedded": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    }
+  }
+}
diff --git a/web/package.json b/web/package.json
new file mode 100644
index 0000000..06cd957
--- /dev/null
+++ b/web/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "repo-vis-web",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build"
+  },
+  "dependencies": {
+    "d3-hierarchy": "^3.1.2",
+    "three": "^0.170.0"
+  },
+  "devDependencies": {
+    "vite": "^6.0.0"
+  }
+}
diff --git a/web/src/app.js b/web/src/app.js
new file mode 100644
index 0000000..6864fdb
--- /dev/null
+++ b/web/src/app.js
@@ -0,0 +1,181 @@
+import { computeLayout } from "./layout.js";
+import { RepoRenderer } from "./renderer.js";
+
+const landing = document.getElementById("landing");
+const loading = document.getElementById("loading");
+const loadingText = document.getElementById("loading-text");
+const viewport = document.getElementById("viewport");
+const controlsHint = document.getElementById("controls-hint");
+const gitUrlInput = document.getElementById("git-url");
+const btnClone = document.getElementById("btn-clone");
+const dropZone = document.getElementById("drop-zone");
+const fileInput = document.getElementById("file-input");
+const historyEl = document.getElementById("history");
+const historyList = document.getElementById("history-list");
+
+function showLoading(msg) {
+  landing.style.display = "none";
+  loading.classList.add("active");
+  loadingText.textContent = msg;
+}
+
+function showVisualization() {
+  loading.classList.remove("active");
+  viewport.classList.add("active");
+  controlsHint.classList.add("active");
+}
+
+function showError(msg) {
+  loading.classList.remove("active");
+  landing.style.display = "";
+  alert(msg);
+}
+
+async function visualize(tree) {
+  showLoading("Building layout...");
+
+  // Wait for fonts to load so canvas renders them correctly
+  await document.fonts.ready;
+  await new Promise((r) => setTimeout(r, 50));
+
+  const { leaves, totalWidth, totalHeight } = computeLayout(tree);
+
+  if (leaves.length === 0) {
+    showError("No source files found in repository.");
+    return;
+  }
+
+  showLoading(`Rendering ${leaves.length} files...`);
+  await new Promise((r) => setTimeout(r, 50));
+
+  showVisualization();
+  const renderer = new RepoRenderer(viewport);
+  renderer.load(leaves, totalWidth, totalHeight);
+}
+
+// --- History ---
+async function loadHistory() {
+  try {
+    const res = await fetch("/api/repos");
+    if (!res.ok) return;
+    const repos = await res.json();
+    if (repos.length === 0) return;
+
+    historyEl.classList.add("has-items");
+    historyList.innerHTML = "";
+
+    for (const repo of repos) {
+      const item = document.createElement("div");
+      item.className = "history-item";
+      item.innerHTML = `
+        <span class="name">${escapeHtml(repo.name)}</span>
+        <span class="meta">${repo.file_count} files</span>
+      `;
+      item.addEventListener("click", () => loadCachedRepo(repo.cache_key, repo.name));
+      historyList.appendChild(item);
+    }
+  } catch {
+    // ignore
+  }
+}
+
+async function loadCachedRepo(key, name) {
+  showLoading(`Loading ${name}...`);
+  try {
+    const res = await fetch(`/api/repos/${key}`);
+    if (!res.ok) throw new Error("Cache expired");
+    const tree = await res.json();
+    await visualize(tree);
+  } catch (err) {
+    showError(err.message);
+  }
+}
+
+function escapeHtml(s) {
+  const div = document.createElement("div");
+  div.textContent = s;
+  return div.innerHTML;
+}
+
+// Load history on page load
+loadHistory();
+
+// --- Git clone ---
+btnClone.addEventListener("click", async () => {
+  const url = gitUrlInput.value.trim();
+  if (!url) return;
+
+  btnClone.disabled = true;
+  showLoading("Cloning repository...");
+
+  try {
+    const res = await fetch("/api/scan-git", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ url }),
+    });
+
+    if (!res.ok) {
+      const err = await res.json();
+      throw new Error(err.error || "Clone failed");
+    }
+
+    const tree = await res.json();
+    await visualize(tree);
+  } catch (err) {
+    showError(err.message);
+  } finally {
+    btnClone.disabled = false;
+  }
+});
+
+gitUrlInput.addEventListener("keydown", (e) => {
+  if (e.key === "Enter") btnClone.click();
+});
+
+// --- Zip upload ---
+dropZone.addEventListener("click", () => fileInput.click());
+
+dropZone.addEventListener("dragover", (e) => {
+  e.preventDefault();
+  dropZone.classList.add("dragover");
+});
+
+dropZone.addEventListener("dragleave", () => {
+  dropZone.classList.remove("dragover");
+});
+
+dropZone.addEventListener("drop", (e) => {
+  e.preventDefault();
+  dropZone.classList.remove("dragover");
+  const file = e.dataTransfer.files[0];
+  if (file) uploadZip(file);
+});
+
+fileInput.addEventListener("change", () => {
+  if (fileInput.files[0]) uploadZip(fileInput.files[0]);
+});
+
+async function uploadZip(file) {
+  showLoading("Uploading and scanning zip...");
+
+  try {
+    const form = new FormData();
+    form.append("file", file);
+
+    const res = await fetch("/api/scan-zip", {
+      method: "POST",
+      body: form,
+    });
+
+    if (!res.ok) {
+      const err = await res.json();
+      throw new Error(err.error || "Upload failed");
+    }
+
+    const tree = await res.json();
+    await visualize(tree);
+  } catch (err) {
+    showError(err.message);
+  }
+}
diff --git a/web/src/layout.js b/web/src/layout.js
new file mode 100644
index 0000000..0b0f247
--- /dev/null
+++ b/web/src/layout.js
@@ -0,0 +1,50 @@
+/**
+ * Treemap layout using d3-hierarchy.
+ * Each file rectangle is sized by: lines × maxLen (the "true" code area).
+ * Returns a flat array of positioned file nodes.
+ */
+
+import { treemap, treemapSquarify, hierarchy } from "d3-hierarchy";
+
+/**
+ * @param {object} tree - The scanned repo tree from scanner.js
+ * @param {number} charW - Character width in world units
+ * @param {number} charH - Character height (line height) in world units
+ * @param {number} padding - Padding between files in world units
+ * @returns {Array<{path, name, x, z, w, h, lines, maxLen, content}>}
+ */
+export function computeLayout(tree, charW = 0.15, charH = 0.3, padding = 2) {
+  const root = hierarchy(tree)
+    .sum((d) => (d.content != null ? d.lines * d.maxLen : 0))
+    .sort((a, b) => b.value - a.value);
+
+  const totalValue = root.value;
+  // Scale factor: we want roughly sqrt(totalValue) * charW on each side
+  const scale = Math.sqrt(totalValue) * charW * 1.2;
+
+  const tm = treemap()
+    .tile(treemapSquarify.ratio(1))
+    .size([scale, scale])
+    .paddingInner(padding)
+    .paddingOuter(padding);
+
+  tm(root);
+
+  const leaves = [];
+  for (const leaf of root.leaves()) {
+    if (!leaf.data.content) continue;
+    leaves.push({
+      path: leaf.data.path,
+      name: leaf.data.name,
+      x: leaf.x0,
+      z: leaf.y0,
+      w: leaf.x1 - leaf.x0,
+      h: leaf.y1 - leaf.y0,
+      lines: leaf.data.lines,
+      maxLen: leaf.data.maxLen,
+      content: leaf.data.content,
+    });
+  }
+
+  return { leaves, totalWidth: scale, totalHeight: scale };
+}
diff --git a/web/src/renderer.js b/web/src/renderer.js
new file mode 100644
index 0000000..e085168
--- /dev/null
+++ b/web/src/renderer.js
@@ -0,0 +1,373 @@
+/**
+ * Three.js renderer for the repo visualization.
+ * - Files are flat planes on the XZ ground plane
+ * - 3D OrbitControls camera
+ * - Semantic zoom: color blocks → code texture based on camera distance
+ */
+
+import * as THREE from "three";
+import { OrbitControls } from "three/addons/controls/OrbitControls.js";
+
+// Color palette by file extension
+const EXT_COLORS = {
+  ".js": 0xf7df1e,
+  ".jsx": 0x61dafb,
+  ".ts": 0x3178c6,
+  ".tsx": 0x61dafb,
+  ".py": 0x3572a5,
+  ".go": 0x00add8,
+  ".rs": 0xdea584,
+  ".c": 0x555555,
+  ".h": 0x555555,
+  ".cpp": 0xf34b7d,
+  ".hpp": 0xf34b7d,
+  ".java": 0xb07219,
+  ".rb": 0xcc342d,
+  ".php": 0x4f5d95,
+  ".html": 0xe34c26,
+  ".css": 0x563d7c,
+  ".scss": 0xc6538c,
+  ".json": 0x40b5a4,
+  ".yaml": 0xcb171e,
+  ".yml": 0xcb171e,
+  ".md": 0x083fa1,
+  ".sh": 0x89e051,
+  ".sql": 0xe38c00,
+  ".vue": 0x41b883,
+  ".svelte": 0xff3e00,
+};
+const DEFAULT_COLOR = 0x8899aa;
+
+function getColor(filename) {
+  const dot = filename.lastIndexOf(".");
+  if (dot === -1) return DEFAULT_COLOR;
+  const ext = filename.substring(dot).toLowerCase();
+  return EXT_COLORS[ext] ?? DEFAULT_COLOR;
+}
+
+/**
+ * Render code text onto a Canvas and return it as a texture.
+ */
+// Monospace font stack with CJK fallback
+const CODE_FONT = 'Terminus, "LXGW WenKai Mono", "Noto Sans Mono CJK SC", "Microsoft YaHei", monospace';
+
+function createCodeTexture(content, lines, maxLen) {
+  const fontSize = 28; // Higher base resolution for sharp zoom
+  const charW = fontSize * 0.6;
+  const lineH = fontSize * 1.4;
+
+  // Wrap lines that exceed maxLen
+  const rawLines = content.split("\n");
+  const wrappedLines = [];
+  for (const line of rawLines) {
+    if (line.length <= maxLen) {
+      wrappedLines.push(line);
+    } else {
+      for (let j = 0; j < line.length; j += maxLen) {
+        wrappedLines.push(line.substring(j, j + maxLen));
+      }
+    }
+  }
+
+  const canvasW = Math.ceil(maxLen * charW) + 20;
+  const canvasH = Math.ceil(wrappedLines.length * lineH) + 20;
+
+  // Cap canvas size — 8192 for sharper textures on modern GPUs
+  const maxDim = 8192;
+  const scaleX = canvasW > maxDim ? maxDim / canvasW : 1;
+  const scaleY = canvasH > maxDim ? maxDim / canvasH : 1;
+  const scale = Math.min(scaleX, scaleY);
+
+  const w = Math.ceil(canvasW * scale);
+  const h = Math.ceil(canvasH * scale);
+
+  const canvas = document.createElement("canvas");
+  canvas.width = w;
+  canvas.height = h;
+  const ctx = canvas.getContext("2d");
+
+  // Dark background
+  ctx.fillStyle = "#1e1e2e";
+  ctx.fillRect(0, 0, w, h);
+
+  ctx.scale(scale, scale);
+  ctx.font = `${fontSize}px ${CODE_FONT}`;
+  ctx.fillStyle = "#cdd6f4";
+  ctx.textBaseline = "top";
+
+  for (let i = 0; i < wrappedLines.length; i++) {
+    ctx.fillText(wrappedLines[i], 10, 10 + i * lineH);
+  }
+
+  const tex = new THREE.CanvasTexture(canvas);
+  tex.minFilter = THREE.LinearMipmapLinearFilter;
+  tex.magFilter = THREE.LinearFilter;
+  tex.anisotropy = 8;
+  return tex;
+}
+
+/**
+ * Create a simple color block texture with the file name.
+ */
+function createBlockTexture(name, color) {
+  const canvas = document.createElement("canvas");
+  canvas.width = 256;
+  canvas.height = 256;
+  const ctx = canvas.getContext("2d");
+
+  const hex = "#" + color.toString(16).padStart(6, "0");
+  ctx.fillStyle = hex;
+  ctx.fillRect(0, 0, 256, 256);
+
+  // Slightly darker border
+  ctx.strokeStyle = "rgba(0,0,0,0.3)";
+  ctx.lineWidth = 4;
+  ctx.strokeRect(2, 2, 252, 252);
+
+  // File name
+  ctx.fillStyle = "#ffffff";
+  ctx.font = "bold 18px sans-serif";
+  ctx.textAlign = "center";
+  ctx.textBaseline = "middle";
+
+  // Truncate long names
+  const label = name.length > 28 ? name.substring(0, 25) + "..." : name;
+  ctx.fillText(label, 128, 128);
+
+  const tex = new THREE.CanvasTexture(canvas);
+  tex.minFilter = THREE.LinearFilter;
+  return tex;
+}
+
+/**
+ * @typedef {Object} FileTile
+ * @property {THREE.Mesh} mesh
+ * @property {object} data - layout data (path, name, content, etc.)
+ * @property {THREE.Texture|null} codeTexture - lazily created
+ * @property {THREE.Texture} blockTexture
+ * @property {boolean} showingCode
+ */
+
+export class RepoRenderer {
+  constructor(container) {
+    this.container = container;
+    this.tiles = [];
+    this.raycaster = new THREE.Raycaster();
+    this.mouse = new THREE.Vector2();
+    this.hoveredTile = null;
+
+    this._initScene();
+    this._initControls();
+    this._initEvents();
+    this._animate();
+  }
+
+  _initScene() {
+    this.scene = new THREE.Scene();
+    this.scene.background = new THREE.Color(0x11111b);
+
+    this.camera = new THREE.PerspectiveCamera(
+      60,
+      window.innerWidth / window.innerHeight,
+      0.1,
+      50000
+    );
+    this.camera.position.set(0, 200, 200);
+    this.camera.lookAt(0, 0, 0);
+
+    this.renderer3d = new THREE.WebGLRenderer({ antialias: true });
+    this.renderer3d.setSize(window.innerWidth, window.innerHeight);
+    this.renderer3d.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+    this.container.appendChild(this.renderer3d.domElement);
+
+    // Ambient + directional light
+    this.scene.add(new THREE.AmbientLight(0xffffff, 0.7));
+    const dirLight = new THREE.DirectionalLight(0xffffff, 0.5);
+    dirLight.position.set(100, 200, 100);
+    this.scene.add(dirLight);
+  }
+
+  _initControls() {
+    this.controls = new OrbitControls(this.camera, this.renderer3d.domElement);
+    this.controls.enableDamping = true;
+    this.controls.dampingFactor = 0.1;
+    this.controls.maxPolarAngle = Math.PI / 2.1; // Don't go below the ground
+    this.controls.minDistance = 1;
+    this.controls.maxDistance = 10000;
+    this.controls.zoomSpeed = 1.5;
+    this.controls.target.set(0, 0, 0);
+
+    // Google Maps-style touch: 1 finger pan, 2 finger pinch zoom + rotate
+    this.controls.touches = {
+      ONE: THREE.TOUCH.PAN,
+      TWO: THREE.TOUCH.DOLLY_ROTATE,
+    };
+  }
+
+  _initEvents() {
+    window.addEventListener("resize", () => {
+      this.camera.aspect = window.innerWidth / window.innerHeight;
+      this.camera.updateProjectionMatrix();
+      this.renderer3d.setSize(window.innerWidth, window.innerHeight);
+    });
+
+    // Hover for tooltip
+    this.renderer3d.domElement.addEventListener("mousemove", (e) => {
+      this.mouse.x = (e.clientX / window.innerWidth) * 2 - 1;
+      this.mouse.y = -(e.clientY / window.innerHeight) * 2 + 1;
+    });
+
+    // Double-click to zoom into a file
+    this.renderer3d.domElement.addEventListener("dblclick", () => {
+      if (this.hoveredTile) {
+        const t = this.hoveredTile;
+        const d = t.data;
+        const targetX = d.x + d.w / 2;
+        const targetZ = d.z + d.h / 2;
+        const viewDist = Math.max(d.w, d.h) * 0.8;
+
+        // Animate camera
+        this._animateTo(
+          new THREE.Vector3(targetX, viewDist, targetZ + viewDist * 0.5),
+          new THREE.Vector3(targetX, 0, targetZ)
+        );
+      }
+    });
+  }
+
+  _animateTo(position, target, duration = 800) {
+    const startPos = this.camera.position.clone();
+    const startTarget = this.controls.target.clone();
+    const startTime = performance.now();
+
+    const step = () => {
+      const elapsed = performance.now() - startTime;
+      const t = Math.min(elapsed / duration, 1);
+      // Smooth ease
+      const ease = t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2;
+
+      this.camera.position.lerpVectors(startPos, position, ease);
+      this.controls.target.lerpVectors(startTarget, target, ease);
+
+      if (t < 1) requestAnimationFrame(step);
+    };
+    requestAnimationFrame(step);
+  }
+
+  /**
+   * Load layout data and create meshes.
+   */
+  load(leaves, totalWidth, totalHeight) {
+    // Center the layout around origin
+    const offsetX = -totalWidth / 2;
+    const offsetZ = -totalHeight / 2;
+
+    for (const leaf of leaves) {
+      const color = getColor(leaf.name);
+
+      // Block texture (far LOD)
+      const blockTex = createBlockTexture(leaf.name, color);
+      const material = new THREE.MeshStandardMaterial({
+        map: blockTex,
+        roughness: 0.8,
+        metalness: 0.1,
+      });
+
+      const geometry = new THREE.PlaneGeometry(leaf.w, leaf.h);
+      const mesh = new THREE.Mesh(geometry, material);
+
+      // Lay flat on XZ plane, slight Y offset to avoid z-fighting
+      mesh.rotation.x = -Math.PI / 2;
+      mesh.position.set(
+        offsetX + leaf.x + leaf.w / 2,
+        0.01,
+        offsetZ + leaf.z + leaf.h / 2
+      );
+
+      this.scene.add(mesh);
+
+      // Adjust leaf coords to world space for camera targeting
+      leaf.x += offsetX;
+      leaf.z += offsetZ;
+
+      this.tiles.push({
+        mesh,
+        data: leaf,
+        codeTexture: null,
+        blockTexture: blockTex,
+        showingCode: false,
+        color,
+      });
+    }
+
+    // Set initial camera to see the whole scene
+    const maxDim = Math.max(totalWidth, totalHeight);
+    this.camera.position.set(0, maxDim * 0.7, maxDim * 0.5);
+    this.controls.target.set(0, 0, 0);
+
+    // Tooltip element
+    this.tooltip = document.getElementById("tooltip");
+  }
+
+  _updateLOD() {
+    const camPos = this.camera.position;
+
+    for (const tile of this.tiles) {
+      const cx = tile.data.x + tile.data.w / 2;
+      const cz = tile.data.z + tile.data.h / 2;
+      const dist = Math.sqrt(
+        (camPos.x - cx) ** 2 + camPos.y ** 2 + (camPos.z - cz) ** 2
+      );
+
+      const fileSize = Math.max(tile.data.w, tile.data.h);
+      // Switch to code texture when close enough to read
+      const threshold = fileSize * 3;
+
+      if (dist < threshold && !tile.showingCode) {
+        // Create code texture lazily
+        if (!tile.codeTexture) {
+          tile.codeTexture = createCodeTexture(
+            tile.data.content,
+            tile.data.lines,
+            tile.data.maxLen
+          );
+        }
+        tile.mesh.material.map = tile.codeTexture;
+        tile.mesh.material.needsUpdate = true;
+        tile.showingCode = true;
+      } else if (dist >= threshold && tile.showingCode) {
+        tile.mesh.material.map = tile.blockTexture;
+        tile.mesh.material.needsUpdate = true;
+        tile.showingCode = false;
+      }
+    }
+  }
+
+  _updateHover() {
+    this.raycaster.setFromCamera(this.mouse, this.camera);
+    const meshes = this.tiles.map((t) => t.mesh);
+    const intersects = this.raycaster.intersectObjects(meshes);
+
+    if (intersects.length > 0) {
+      const mesh = intersects[0].object;
+      const tile = this.tiles.find((t) => t.mesh === mesh);
+      this.hoveredTile = tile;
+
+      if (this.tooltip && tile) {
+        this.tooltip.style.display = "block";
+        this.tooltip.textContent = `${tile.data.path}  (${tile.data.lines} lines)`;
+      }
+    } else {
+      this.hoveredTile = null;
+      if (this.tooltip) this.tooltip.style.display = "none";
+    }
+  }
+
+  _animate() {
+    requestAnimationFrame(() => this._animate());
+    this.controls.update();
+    this._updateLOD();
+    this._updateHover();
+    this.renderer3d.render(this.scene, this.camera);
+  }
+}
diff --git a/web/vite.config.js b/web/vite.config.js
new file mode 100644
index 0000000..070af7d
--- /dev/null
+++ b/web/vite.config.js
@@ -0,0 +1,12 @@
+import { defineConfig } from "vite";
+
+export default defineConfig({
+  server: {
+    proxy: {
+      "/api": "http://localhost:3000",
+    },
+  },
+  build: {
+    outDir: "dist",
+  },
+});