diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..eacf8dd
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,74 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+**Setup:**
+```bash
+python -m venv venv
+venv/bin/pip install -r requirements.txt
+```
+
+**Run:**
+```bash
+bash run.sh          # kills anything on port 5000, then starts the app
+# or directly:
+venv/bin/python app.py
+```
+
+The app runs on `http://localhost:5000`. There are no tests.
+
+## Architecture
+
+This is a single-page IPTV channel manager for Acestream links. The entire backend is `app.py` (Flask) and the entire frontend is `static/index.html` (vanilla JS + bundled Tailwind).
+
+### Data flow
+
+1. **Startup**: `app.py` builds a logo index by walking `tv-logos-main/` (PNG files), then loads `channels.json` if it exists, otherwise falls back to `example.m3u`.
+2. **M3U parsing** (`parse_m3u`): Reads `#EXTINF` lines and `acestream://` URLs only — non-Acestream URL lines are silently discarded. `#EXTGRP` lines provide group logos.
+3. **Channel grouping** (`group_channels`): Channels sharing the same `base_name` + `group` (case-insensitive) are merged into a single channel with multiple `mirrors`. Each mirror stores `resolution` and `acestream_hash`.
+4. **Logo resolution** (`resolve_logo`): Priority is local logo by tvg-id slug → local logo by channel name slug → external `tvg-logo` URL → empty. The logo index strips trailing 2-3 letter country suffixes for fuzzy matching.
+5. **Global state**: The `state` dict holds `channels`, `groups`, `group_meta`, and `source_file`. `channels.json` is hot-reloaded on `/api/channels` requests if its mtime changed.
+
+### Channel object schema
+
+```json
+{
+  "id": "dazn-laliga",           // URL-safe slug, deduplicated with -N suffix
+  "name": "DAZN LaLiga",         // base name without resolution/quality markers
+  "group": "Sports",
+  "subcategory": "",             // set manually via JSON import
+  "country_code": "es",          // 2-letter ISO, derived from logo path or tvg-logo URL
+  "logo_url": "/logos/...",      // local or external URL
+  "tags": [],                    // emoji/string tags set manually
+  "mirrors": [
+    { "resolution": "1080p", "acestream_hash": "abc123..." }
+  ]
+}
+```
+
+### API endpoints
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | `/api/channels` | Returns current channel list (hot-reloads JSON if changed) |
+| POST | `/api/import/m3u` | Upload M3U file, replaces state |
+| POST | `/api/import/json` | Upload JSON export, replaces state |
+| GET | `/api/export/json` | Download channels as JSON |
+| GET | `/api/export/m3u` | Download channels as M3U (Acestream) |
+| GET | `/logos/<path>` | Serve files from `tv-logos-main/` |
+| GET | `/flags/<code>.svg` | Serve country flag SVGs from `svg/` |
+
+### Key files
+
+- `app.py` — entire backend; no separate modules
+- `static/index.html` — entire frontend; all JS inline, Tailwind via `static/tailwind.js`
+- `channels.json` — persisted channel data; auto-loaded at startup; hot-reloaded on change
+- `example.m3u` — fallback playlist used if `channels.json` is absent
+- `tv-logos-main/` — local PNG logo library (indexed at startup, not committed to git)
+- `svg/` — country flag SVGs named by ISO 3166-1 alpha-2 code (e.g. `es.svg`)
+
+### Frontend state
+
+The JS `App` object in `index.html` holds all UI state: `channels`, `groups`, `groupMeta`, `activeGroup`, `activeSubcategory`, `activeTags`, `search`. All rendering is done by `renderAll()` → `renderSidebar()` + `renderGrid()`. Event delegation is used throughout (no per-card listeners). Clicking a channel card opens a modal with sorted mirrors (diamond > gold > silver > bronze quality tiers).
diff --git a/channels.json b/channels.json
index 68323fa..3d4efd3 100644
--- a/channels.json
+++ b/channels.json
@@ -273,7 +273,7 @@
       "group": "RFEF",
       "subcategory": "",
       "country_code": "es",
-      "logo_url": "https://static.wikia.nocookie.net/logopedia/images/d/df/Logo_Primera_RFEF_2021.png/revision/latest?cb=20230620215900&path-prefix=es",
+      "logo_url": "/logos/countries/spain/rfef-tv.png",
       "tags": ["\u26BD"],
       "mirrors": [
         {
diff --git a/run.sh b/run.sh
index f705dc8..080d21b 100755
--- a/run.sh
+++ b/run.sh
@@ -7,4 +7,4 @@ kill $(ss -anp 2>/dev/null | grep ':5000' | grep -oP 'pid=\K\d+' | sort -u) 2>/d
 sleep 1
 
 echo "Arrancando A13 TV..."
-.venv/bin/python app.py
+venv/bin/python app.py
diff --git a/tv-logos-main/countries/spain/rfef-tv.png b/tv-logos-main/countries/spain/rfef-tv.png
new file mode 100644
index 0000000..8f541c6
Binary files /dev/null and b/tv-logos-main/countries/spain/rfef-tv.png differ