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+Add swayidle to make the screen go dark
+
+---
+
+### Step 1: Install `swayidle`
+
+Open your terminal and install `swayidle` from the official Arch repositories. It's good practice to also install a screen locker like `swaylock` at the same time, as you'll likely want to lock your screen before it turns off.
+
+```bash
+sudo pacman -S swayidle swaylock
+```
+
+### Step 2: Create the Idle Management Script
+
+It's cleanest to manage this with a small shell script. Let's create one in niri's configuration directory.
+
+1.  Create the file:
+    ```bash
+    mkdir -p ~/.config/niri
+    nano ~/.config/niri/idle.sh
+    ```
+
+2.  Paste the following content into the file. This configuration will do two things:
+    *   **After 10 minutes (600s):** Lock the screen with `swaylock`.
+    *   **After 15 minutes (900s):** Turn the display off (DPMS off).
+    *   **On resume (mouse/keyboard activity):** Turn the display back on (DPMS on).
+
+    ```sh
+    #!/bin/sh
+
+    # This script is a simple wrapper for swayidle.
+    # It locks the screen after 10 minutes of inactivity,
+    # and turns off the display after 15 minutes.
+
+    swayidle -w \
+         timeout 600 'swaylock -f' \
+         timeout 900 'niri msg output "*" dpms off' \
+         resume 'niri msg output "*" dpms on'
+    ```
+
+    *   `swayidle -w`: Starts the daemon and waits (doesn't exit).
+    *   `timeout 600 'swaylock -f'`: After 600 seconds (10 minutes) of inactivity, run `swaylock -f` to lock the screen.
+    *   `timeout 900 'niri msg output "*" dpms off'`: After 900 seconds (15 minutes), run the command to turn off all outputs (`*`). The command `niri msg` is how you control niri from the command line.
+    *   `resume 'niri msg output "*" dpms on'`: When activity is detected again (mouse move, key press), run the command to turn all outputs back on.
+
+3.  Save the file and exit `nano` (Ctrl+O, Enter, Ctrl+X).
+
+4.  Make the script executable:
+    ```bash
+    chmod +x ~/.config/niri/idle.sh
+    ```
+
+### Step 3: Autostart the Script with Niri
+
+Now, we need to tell niri to run this script every time it starts.
+
+1.  Open your niri configuration file. If it doesn't exist, niri uses its defaults, but you can create it.
+    ```bash
+    nano ~/.config/niri/config.kdl
+    ```
+
+2.  Add the `startup-commands` block if it doesn't exist, and add an `exec-on-startup` command to run your script. Make sure to use the full path.
+
+    ```kdl
+    // Your other niri configurations might be here...
+
+    startup-commands {
+        // Add this line to run your idle script
+        exec-on-startup "~/.config/niri/idle.sh"
+
+        // You might have other startup commands here, for example:
+        // exec-on-startup "waybar"
+        // exec-on-startup "mako"
+    }
+
+    // More of your niri config...
+    ```
+
+    **Note:** The `~` shortcut for your home directory works in the niri config.
+
+3.  Save and close the file.
+
+### Step 4: Apply the Changes
+
+Log out of your niri session and log back in. The `idle.sh` script will now be running in the background. Your screen will lock after 10 minutes and turn off after 15 minutes of inactivity. Moving your mouse or pressing a key will wake the screen up to the `swaylock` prompt.
+
+---
+
+### Customization
+
+*   **To only turn off the screen (no lock):**
+    If you *only* want the screen to go black after 15 minutes and don't want to lock it, modify your `~/.config/niri/idle.sh` script to remove the `swaylock` timeout:
+
+    ```sh
+    #!/bin/sh
+
+    swayidle -w \
+         timeout 900 'niri msg output "*" dpms off' \
+         resume 'niri msg output "*" dpms on'
+    ```
+    This directly addresses your original request.
+
+*   **Changing the time:**
+    Simply change the number of seconds in the script. For example, for a 5-minute screen-off time, change `900` to `300`.
+
+*   **Customizing swaylock:**
+    You can make `swaylock` look nicer. For example, to set a solid color:
+    `swaylock -f -c 000000` (for black).
+    You can edit this command directly in your `idle.sh` script. Check `man swaylock` for all options.
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