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diff --git a/remote-dev/bootstrap.sh b/remote-dev/bootstrap.sh
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+++ b/remote-dev/bootstrap.sh
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+#!/usr/bin/env sh
+# Bootstrap a headless dev environment on a fresh Ubuntu 22.04 VM.
+# Idempotent: safe to re-run.
+#
+#   curl -fsSL https://raw.githubusercontent.com/<user>/dotfiles/master/remote-dev/bootstrap.sh | sh
+#
+# Steps:
+#   1. Install Nix (Determinate Systems installer, multi-user).
+#   2. Clone (or fast-forward) the dotfiles repo to ~/.local/share/dotfiles.
+#   3. Run `home-manager switch --flake .../remote-dev#vm`.
+#   4. Add Nix-store zsh to /etc/shells and chsh the user.
+#
+# Environment overrides:
+#   DOTFILES_REPO   Git URL (default: https://github.com/ruifm/dotfiles)
+#   DOTFILES_REF    Branch/tag/sha (default: master)
+#   DOTFILES_DIR    Checkout path (default: $HOME/.local/share/dotfiles)
+
+set -eu
+
+REPO="${DOTFILES_REPO:-https://github.com/ruifm/dotfiles}"
+REF="${DOTFILES_REF:-master}"
+DIR="${DOTFILES_DIR:-$HOME/.local/share/dotfiles}"
+
+log() { printf '\033[1;32m==>\033[0m %s\n' "$*"; }
+err() { printf '\033[1;31m==>\033[0m %s\n' "$*" >&2; }
+
+# ── 1. Nix ────────────────────────────────────────────────────────────────────
+if ! command -v nix >/dev/null 2>&1; then
+  log "Installing Nix (Determinate Systems installer)…"
+  curl --proto '=https' --tlsv1.2 -sSf -L \
+    https://install.determinate.systems/nix |
+    sh -s -- install linux --no-confirm
+else
+  log "Nix already installed, skipping installer."
+fi
+
+# Source nix env for the rest of this script (installer writes
+# /etc/profile.d/nix.sh but the current shell hasn't sourced it).
+if [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+  # shellcheck disable=SC1091
+  . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+fi
+
+# ── 2. Repo checkout ─────────────────────────────────────────────────────────
+if ! command -v git >/dev/null 2>&1; then
+  log "Bootstrapping git via nix profile…"
+  nix profile install nixpkgs#git
+fi
+
+if [ -d "$DIR/.git" ]; then
+  log "Updating existing checkout at $DIR…"
+  git -C "$DIR" fetch origin "$REF"
+  git -C "$DIR" checkout "$REF"
+  git -C "$DIR" pull --ff-only
+else
+  log "Cloning $REPO ($REF) → $DIR…"
+  mkdir -p "$(dirname "$DIR")"
+  git clone --branch "$REF" "$REPO" "$DIR"
+fi
+
+# ── 3. Home-Manager switch ───────────────────────────────────────────────────
+log "Running home-manager switch (this can take a while on first run)…"
+nix --extra-experimental-features 'nix-command flakes' \
+  run home-manager/master -- \
+  switch --impure --flake "$DIR/remote-dev#vm" -b backup
+
+# ── 4. chsh to nix-store zsh ─────────────────────────────────────────────────
+NIX_ZSH="$HOME/.nix-profile/bin/zsh"
+if [ -x "$NIX_ZSH" ]; then
+  if ! grep -qxF "$NIX_ZSH" /etc/shells 2>/dev/null; then
+    log "Appending $NIX_ZSH to /etc/shells (requires sudo)…"
+    echo "$NIX_ZSH" | sudo tee -a /etc/shells >/dev/null
+  fi
+  current_shell="$(getent passwd "$USER" | cut -d: -f7)"
+  if [ "$current_shell" != "$NIX_ZSH" ]; then
+    log "Changing login shell to $NIX_ZSH (requires sudo)…"
+    sudo chsh -s "$NIX_ZSH" "$USER"
+  fi
+fi
+
+log "Done. Log out and back in for the new shell to take effect."
+log "Then run 'nvim' once to let it fetch plugins on first launch."