diff --git a/.gitignore b/.gitignore
index 153eb45..14be480 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,8 @@ dist-ssr
 .env
 .env.local
 .env.production
+.env.staging
+.env.preview
 .DS_Store
 *.pem
 coverage
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..bde5e10
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,174 @@
+# ─────────────────────────────────────────────────────────────────────────────
+# BudgetWise CI/CD Pipeline
+#
+# Branch → Environment mapping:
+#   main          →  production   (https://{PROD_URL})
+#   staging       →  staging      (https://{STAGING_URL})
+#   merge request →  preview      (https://{MR_IID}.{BASE_DOMAIN})
+#
+# All config lives in GitLab CI/CD variables (Settings → CI/CD → Variables).
+# No .env files are committed — the build generates them at runtime.
+#
+# Required variables:
+#   SSH_PRIVATE_KEY            Private key with access to DEPLOY_HOST
+#   DEPLOY_HOST                Server hostname or IP
+#   DEPLOY_USER                SSH username on the server
+#   DEPLOY_PATH                Base deploy path  e.g. /var/www/budget-app
+#
+#   PROD_URL                   e.g. https://budget.kushalgaywala.com
+#   PROD_APPWRITE_ENDPOINT     e.g. https://appwrite.example.com/v1
+#   PROD_APPWRITE_PROJECT_ID
+#
+#   STAGING_URL                e.g. https://staging.budget.kushalgaywala.com
+#   STAGING_APPWRITE_ENDPOINT
+#   STAGING_APPWRITE_PROJECT_ID
+#
+#   BASE_DOMAIN                MR preview base  e.g. budget.kushalgaywala.com
+#                              Preview URLs: https://{mr-iid}.{BASE_DOMAIN}
+#                              Preview shares staging Appwrite credentials.
+#
+# Server directory layout:
+#   $DEPLOY_PATH/production/   ← prod
+#   $DEPLOY_PATH/staging/      ← staging
+#   $DEPLOY_PATH/mr-{iid}/     ← MR preview (removed on MR close)
+# ─────────────────────────────────────────────────────────────────────────────
+
+stages:
+  - build
+  - deploy
+
+.deploy_base:
+  image: alpine:latest
+  before_script:
+    - apk add --no-cache rsync openssh-client
+    - eval $(ssh-agent -s)
+    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
+    - mkdir -p ~/.ssh && chmod 700 ~/.ssh
+    - ssh-keyscan -H "$DEPLOY_HOST" >> ~/.ssh/known_hosts
+
+# ── Production ────────────────────────────────────────────────────────────────
+
+build:production:
+  stage: build
+  image: node:20-alpine
+  variables:
+    VITE_APP_URL: $PROD_URL
+    VITE_APPWRITE_ENDPOINT: $PROD_APPWRITE_ENDPOINT
+    VITE_APPWRITE_PROJECT_ID: $PROD_APPWRITE_PROJECT_ID
+  script:
+    - npm ci
+    - npm run build
+    - echo "VITE_APP_URL=$PROD_URL" > deploy.env
+  artifacts:
+    paths:
+      - dist/
+    reports:
+      dotenv: deploy.env
+    expire_in: 1 hour
+  rules:
+    - if: $CI_COMMIT_BRANCH == "main"
+
+deploy:production:
+  extends: .deploy_base
+  stage: deploy
+  environment:
+    name: production
+    url: $VITE_APP_URL
+  script:
+    - rsync -avz --delete dist/ "$DEPLOY_USER@$DEPLOY_HOST:$DEPLOY_PATH/production/"
+  needs:
+    - job: build:production
+      artifacts: true
+  rules:
+    - if: $CI_COMMIT_BRANCH == "main"
+
+# ── Staging ───────────────────────────────────────────────────────────────────
+
+build:staging:
+  stage: build
+  image: node:20-alpine
+  variables:
+    VITE_APP_URL: $STAGING_URL
+    VITE_APPWRITE_ENDPOINT: $STAGING_APPWRITE_ENDPOINT
+    VITE_APPWRITE_PROJECT_ID: $STAGING_APPWRITE_PROJECT_ID
+  script:
+    - npm ci
+    - npx tsc --noEmit
+    - npx vite build --mode staging
+    - echo "VITE_APP_URL=$STAGING_URL" > deploy.env
+  artifacts:
+    paths:
+      - dist/
+    reports:
+      dotenv: deploy.env
+    expire_in: 1 hour
+  rules:
+    - if: $CI_COMMIT_BRANCH == "staging"
+
+deploy:staging:
+  extends: .deploy_base
+  stage: deploy
+  environment:
+    name: staging
+    url: $VITE_APP_URL
+  script:
+    - rsync -avz --delete dist/ "$DEPLOY_USER@$DEPLOY_HOST:$DEPLOY_PATH/staging/"
+  needs:
+    - job: build:staging
+      artifacts: true
+  rules:
+    - if: $CI_COMMIT_BRANCH == "staging"
+
+# ── Preview / MR ──────────────────────────────────────────────────────────────
+# One ephemeral environment per MR: https://{mr-iid}.{BASE_DOMAIN}
+# Uses staging Appwrite credentials.
+# Environment is torn down automatically when the MR is closed.
+
+build:preview:
+  stage: build
+  image: node:20-alpine
+  variables:
+    VITE_APPWRITE_ENDPOINT: $STAGING_APPWRITE_ENDPOINT
+    VITE_APPWRITE_PROJECT_ID: $STAGING_APPWRITE_PROJECT_ID
+  script:
+    - npm ci
+    - npx tsc --noEmit
+    - export MR_URL="https://$CI_MERGE_REQUEST_IID.$BASE_DOMAIN"
+    - VITE_APP_URL=$MR_URL npx vite build --mode preview
+    - echo "VITE_APP_URL=$MR_URL" > deploy.env
+  artifacts:
+    paths:
+      - dist/
+    reports:
+      dotenv: deploy.env
+    expire_in: 1 day
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+
+deploy:preview:
+  extends: .deploy_base
+  stage: deploy
+  environment:
+    name: review/mr-$CI_MERGE_REQUEST_IID
+    url: $VITE_APP_URL
+    on_stop: stop:preview
+  script:
+    - rsync -avz --delete dist/ "$DEPLOY_USER@$DEPLOY_HOST:$DEPLOY_PATH/mr-$CI_MERGE_REQUEST_IID/"
+  needs:
+    - job: build:preview
+      artifacts: true
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+
+stop:preview:
+  extends: .deploy_base
+  stage: deploy
+  environment:
+    name: review/mr-$CI_MERGE_REQUEST_IID
+    action: stop
+  script:
+    - ssh "$DEPLOY_USER@$DEPLOY_HOST" "rm -rf $DEPLOY_PATH/mr-$CI_MERGE_REQUEST_IID"
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      when: manual
+  allow_failure: true