delimiter character setup + extended api data

modified:   templates/index.html

.gitignore

@@ -1,2 +1,3 @@
 pos_database.db
 ScannerGO/ScannerGO-*
+ScannerGO/config.json

README.md

@@ -1,4 +1,4 @@
-# SekiPOS v1.2 🍫🥤
+# SekiPOS v1.6 🍫🥤
 
 A reactive POS inventory system for software engineers with a snack addiction. Features real-time UI updates, automatic product discovery via Open Food Facts, and local image caching.
 
@@ -8,6 +8,7 @@ A reactive POS inventory system for software engineers with a snack addiction. F
 - **Local Cache:** Saves images locally to `static/cache` to avoid IP bans.
 - **CLP Ready:** Chilean Peso formatting ($1.234) for local commerce.
 - **Secure:** Hashed password authentication via Flask-Login.
+- **On device scanner:** Add and scan products from within your phone!
 
 ## 🐳 Docker Deployment (Server)
 
@@ -23,6 +24,7 @@ docker run -d \
   -v $(pwd)/sekipos/db:/app/db \
   -v $(pwd)/sekipos/static/cache:/app/static/cache \
   --name sekipos-server \
+  --restart unless-stopped \
   sekipos:latest
 ```
 
@@ -38,6 +40,7 @@ services:
             - YOUR_PATH/sekipos/static/cache:/app/static/cache
         container_name: sekipos-server
         image: sekipos:latest
+        restart: unless-stopped
 ```
 
 ## 🔌 Hardware Scanner Bridge (`ScannerGO`)
@@ -80,7 +83,7 @@ python app.py
 - `db/pos_database.db`: SQLite storage.
 
 ## 📋 TODOs?
-- Better admin registration(?)
+- Some form of user registration(?)
 
 ## 🥼 Food Datasets
 - https://www.ifpsglobal.com/plu-codes-search

ScannerGO/build.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# Define binary names
+LINUX_BIN="ScannerGO-linux"
+LINUX_ARM_BIN="ScannerGO-linuxARMv7"
+WINDOWS_BIN="ScannerGO-windows.exe"
+
+echo "Starting build process..."
+
+# Build for Linux (64-bit)
+echo "Building for Linux..."
+GOOS=linux GOARCH=amd64 go build -o "$LINUX_BIN" main.go
+
+if [ $? -eq 0 ]; then
+    echo "Successfully built: $LINUX_BIN"
+else
+    echo "Failed to build Linux binary"
+    exit 1
+fi
+
+# Build for Windows (64-bit)
+echo "Building for Windows..."
+GOOS=windows GOARCH=amd64 go build -o "$WINDOWS_BIN" main.go
+
+if [ $? -eq 0 ]; then
+    echo "Successfully built: $WINDOWS_BIN"
+else
+    echo "Failed to build Windows binary"
+    exit 1
+fi
+
+# Build for Linux ARM (ARMv7)
+echo "Building for Linux ARMv7..."
+GOOS=linux GOARCH=arm GOARM=7 go build -o "$LINUX_ARM_BIN" main.go
+if [ $? -eq 0 ]; then
+    echo "Successfully built: $LINUX_ARM_BIN"
+else
+    echo "Failed to build Linux ARMv7 binary"
+    exit 1
+fi
+
+echo "Build complete."

ScannerGO/main.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"bufio"
+	"bytes"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
@@ -13,45 +16,120 @@ import (
 	"github.com/tarm/serial"
 )
 
+type Config struct {
+	Port      string `json:"port"`
+	URL       string `json:"url"`
+	BaudRate  int    `json:"baud"`
+	Delimiter string `json:"delimiter"`
+}
+
+var defaultConfig = Config{
+	Port:      "/dev/ttyACM0",
+	URL:       "https://scanner.sekidesu.xyz/scan",
+	BaudRate:  115200,
+	Delimiter: "\n",
+}
+
+const configPath = "config.json"
+
 func main() {
-	portName := flag.String("port", "/dev/ttyACM0", "Serial port name")
-	endpoint := flag.String("url", "https://scanner.sekidesu.xyz/scan", "Target URL endpoint")
-	baudRate := flag.Int("baud", 115200, "Baud rate")
+	cfg := loadConfig()
+
+	portName := flag.String("port", cfg.Port, "Serial port name")
+	endpoint := flag.String("url", cfg.URL, "Target URL endpoint")
+	baudRate := flag.Int("baud", cfg.BaudRate, "Baud rate")
+	delim := flag.String("delim", cfg.Delimiter, "Line delimiter")
+	save := flag.Bool("save", false, "Save current parameters to config.json")
 	flag.Parse()
 
-	config := &serial.Config{
-		Name:        *portName,
-		Baud:        *baudRate,
-		ReadTimeout: time.Second * 2,
+	cfg.Port = *portName
+	cfg.URL = *endpoint
+	cfg.BaudRate = *baudRate
+	cfg.Delimiter = *delim
+
+	if *save {
+		saveConfig(cfg)
+		fmt.Println("Settings saved to", configPath)
 	}
 
-	port, err := serial.OpenPort(config)
+	serialConfig := &serial.Config{
+		Name:        cfg.Port,
+		Baud:        cfg.BaudRate,
+		ReadTimeout: 0,
+	}
+
+	port, err := serial.OpenPort(serialConfig)
 	if err != nil {
-		fmt.Printf("Error opening port %s: %v\n", *portName, err)
+		fmt.Printf("Error opening port %s: %v\n", cfg.Port, err)
 		os.Exit(1)
 	}
 	defer port.Close()
 
-	fmt.Printf("Listening on %s (Baud: %d)...\n", *portName, *baudRate)
-	fmt.Printf("Sending data to: %s\n", *endpoint)
+	fmt.Printf("Listening on %s (Baud: %d, Delim: %q)...\n", cfg.Port, cfg.BaudRate, cfg.Delimiter)
 
-	buf := make([]byte, 128)
-	for {
-		n, err := port.Read(buf)
-		if err != nil {
-			if err != io.EOF {
-				fmt.Printf("Read error: %v\n", err)
-			}
-			continue
+	scanner := bufio.NewScanner(port)
+
+	// Custom split function to handle the configurable delimiter
+	scanner.Split(func(data []byte, atEOF bool) (advance int, token []byte, err error) {
+		if atEOF && len(data) == 0 {
+			return 0, nil, nil
 		}
+		if i := bytes.Index(data, []byte(cfg.Delimiter)); i >= 0 {
+			return i + len(cfg.Delimiter), data[0:i], nil
+		}
+		if atEOF {
+			return len(data), data, nil
+		}
+		return 0, nil, nil
+	})
 
-		if n > 0 {
-			content := strings.TrimSpace(string(buf[:n]))
-			if content != "" {
-				sendToEndpoint(*endpoint, content)
-			}
+	for scanner.Scan() {
+		content := strings.TrimSpace(scanner.Text())
+		if content != "" {
+			sendToEndpoint(cfg.URL, content)
 		}
 	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Printf("Scanner error: %v\n", err)
+	}
+}
+
+func loadConfig() Config {
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		saveConfig(defaultConfig)
+		return defaultConfig
+	}
+
+	file, err := os.Open(configPath)
+	if err != nil {
+		return defaultConfig
+	}
+	defer file.Close()
+
+	var cfg Config
+	decoder := json.NewDecoder(file)
+	if err := decoder.Decode(&cfg); err != nil {
+		return defaultConfig
+	}
+	// Handle case where JSON exists but field is missing
+	if cfg.Delimiter == "" {
+		cfg.Delimiter = "\n"
+	}
+	return cfg
+}
+
+func saveConfig(cfg Config) {
+	file, err := os.Create(configPath)
+	if err != nil {
+		fmt.Printf("Failed to create/save config: %v\n", err)
+		return
+	}
+	defer file.Close()
+
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "  ")
+	encoder.Encode(cfg)
 }
 
 func sendToEndpoint(baseURL, content string) {
@@ -60,7 +138,6 @@ func sendToEndpoint(baseURL, content string) {
 	}
 
 	fullURL := fmt.Sprintf("%s?content=%s", baseURL, url.QueryEscape(content))
-
 	resp, err := client.Get(fullURL)
 	if err != nil {
 		fmt.Printf("Network Error: %v\n", err)
@@ -68,5 +145,15 @@ func sendToEndpoint(baseURL, content string) {
 	}
 	defer resp.Body.Close()
 
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Printf("Error reading response: %v\n", err)
+		return
+	}
+
 	fmt.Printf("Data: [%s] | Status: %s\n", content, resp.Status)
+	if len(body) > 0 {
+		fmt.Printf("Response: %s\n", string(body))
+	}
+	fmt.Println(strings.Repeat("-", 30))
 }

ScannerPython/scannerV2.py

@@ -0,0 +1,36 @@
+import serial
+import requests
+import time
+import argparse
+import sys
+
+def run_bridge():
+    parser = argparse.ArgumentParser(description="Scanner Bridge for the technically impaired")
+    parser.add_argument('--port', default='COM5', help='Serial port (default: COM5)')
+    parser.add_argument('--baud', type=int, default=115200, help='Baud rate (default: 115200)')
+    parser.add_argument('--url', default='https://scanner.sekidesu.xyz/scan', help='Server URL')
+    args = parser.parse_args()
+
+    try:
+        ser = serial.Serial(args.port, args.baud, timeout=0.1)
+        print(f"Connected to {args.port} at {args.baud} bauds.")
+        
+        while True:
+            if ser.in_waiting > 0:
+                barcode = ser.readline().decode('utf-8', errors='ignore').strip()
+                if barcode:
+                    print(f"Scanned: {barcode}")
+                    try:
+                        resp = requests.get(args.url, params={'content': barcode}, timeout=5)
+                        print(f"Server responded: {resp.status_code}")
+                    except Exception as e:
+                        print(f"Failed to send to server: {e}")
+            time.sleep(0.01)
+
+    except serial.SerialException as e:
+        print(f"Error opening {args.port}: {e}")
+    except KeyboardInterrupt:
+        print("\nBridge stopped. Finally.")
+
+if __name__ == "__main__":
+    run_bridge()

app.py

@@ -6,6 +6,7 @@ from flask_socketio import SocketIO, emit
 from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
 from werkzeug.security import generate_password_hash, check_password_hash
 import mimetypes
+import time
 
 app = Flask(__name__)
 app.config['SECRET_KEY'] = 'seki_super_secret_key_99' # Change this if you have actual friends
@@ -74,11 +75,6 @@ def download_image(url, barcode):
     return url
 
 def fetch_from_openfoodfacts(barcode):
-    # Check if we already have a cached image even if API fails
-    local_filename = f"{barcode}.jpg"
-    local_path = os.path.join(CACHE_DIR, local_filename)
-    cached_url = f"/static/cache/{local_filename}" if os.path.exists(local_path) else None
-
     url = f"https://world.openfoodfacts.org/api/v2/product/{barcode}.json"
     try:
         headers = {'User-Agent': 'SekiPOS/1.0'}
@@ -89,16 +85,14 @@ def fetch_from_openfoodfacts(barcode):
             name = p.get('product_name_es') or p.get('product_name') or p.get('brands', 'Unknown')
             imgs = p.get('selected_images', {}).get('front', {}).get('display', {})
             img_url = imgs.get('es') or imgs.get('en') or p.get('image_url', '')
-            local_img = download_image(img_url, barcode)
-            return {"name": name, "image": local_img}
+            
+            if img_url:
+                local_img = download_image(img_url, barcode)
+                return {"name": name, "image": local_img}
+            return {"name": name, "image": None}
             
     except Exception as e:
         print(f"API Error: {e}")
-
-    # If API fails but we have a cache, return the cache with a generic name
-    if cached_url:
-        return {"name": "Producto Cacheado", "image": cached_url}
-        
     return None
 
 # --- ROUTES ---
@@ -163,32 +157,122 @@ def delete(barcode):
 @app.route('/scan', methods=['GET'])
 def scan():
     barcode = request.args.get('content', '').replace('{content}', '')
-    if not barcode: return jsonify({"err": "empty"}), 400
+    if not barcode: 
+        return jsonify({"status": "error", "message": "empty barcode"}), 400
     
     with sqlite3.connect(DB_FILE) as conn:
         p = conn.execute('SELECT * FROM products WHERE barcode = ?', (barcode,)).fetchone()
     
+    # 1. Product exists in local Database
     if p:
-        socketio.emit('new_scan', {"barcode": p[0], "name": p[1], "price": int(p[2]), "image": p[3]})
-        return jsonify({"status": "ok"})
+        barcode_val, name, price, image_path = p
         
-    # Not in DB, try external API or Local Cache
+        # Image recovery logic for missing local files
+        if image_path and image_path.startswith('/static/'):
+            clean_path = image_path.split('?')[0].lstrip('/')
+            if not os.path.exists(clean_path):
+                ext_data = fetch_from_openfoodfacts(barcode_val)
+                if ext_data and ext_data.get('image'):
+                    image_path = ext_data['image']
+                    with sqlite3.connect(DB_FILE) as conn:
+                        conn.execute('UPDATE products SET image_url = ? WHERE barcode = ?', (image_path, barcode_val))
+                        conn.commit()
+
+        product_data = {
+            "barcode": barcode_val, 
+            "name": name, 
+            "price": int(price), 
+            "image": image_path
+        }
+        
+        socketio.emit('new_scan', product_data)
+        return jsonify({"status": "ok", "data": product_data}), 200
+    
+    # 2. Product not in DB, try external API
     ext = fetch_from_openfoodfacts(barcode)
     if ext:
-        socketio.emit('scan_error', {
+        # We found it externally, but it's still a 404 relative to our local DB
+        external_data = {
             "barcode": barcode, 
             "name": ext['name'], 
-            "image": ext['image']
-        })
-    else:
-        socketio.emit('scan_error', {"barcode": barcode})
+            "image": ext['image'],
+            "source": "openfoodfacts"
+        }
+        socketio.emit('scan_error', external_data)
+        return jsonify({"status": "not_found", "data": external_data}), 404
     
-    return jsonify({"status": "not_found"}), 404
+    # 3. Truly not found anywhere
+    socketio.emit('scan_error', {"barcode": barcode})
+    return jsonify({"status": "not_found", "data": {"barcode": barcode}}), 404
 
 @app.route('/static/cache/<path:filename>')
 def serve_cache(filename):
     return send_from_directory(CACHE_DIR, filename)
 
+@app.route('/bulk_price_update', methods=['POST'])
+@login_required
+def bulk_price_update():
+    data = request.get_json()
+    barcodes = data.get('barcodes', [])
+    new_price = data.get('new_price')
+
+    if not barcodes or new_price is None:
+        return jsonify({"error": "Missing data"}), 400
+
+    try:
+        with sqlite3.connect(DB_FILE) as conn:
+            # Use executemany for efficiency
+            params = [(float(new_price), b) for b in barcodes]
+            conn.executemany('UPDATE products SET price = ? WHERE barcode = ?', params)
+            conn.commit()
+        return jsonify({"status": "success"}), 200
+    except Exception as e:
+        print(f"Bulk update failed: {e}")
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/bulk_delete', methods=['POST'])
+@login_required
+def bulk_delete():
+    data = request.get_json()
+    barcodes = data.get('barcodes', [])
+
+    if not barcodes:
+        return jsonify({"error": "No barcodes provided"}), 400
+
+    try:
+        with sqlite3.connect(DB_FILE) as conn:
+            # Delete records from DB
+            conn.execute(f'DELETE FROM products WHERE barcode IN ({",".join(["?"]*len(barcodes))})', barcodes)
+            conn.commit()
+        
+        # Clean up cache for each deleted product
+        for barcode in barcodes:
+            # This is a bit naive as it only checks .jpg, but matches your existing delete logic
+            img_p = os.path.join(CACHE_DIR, f"{barcode}.jpg")
+            if os.path.exists(img_p): 
+                os.remove(img_p)
+                
+        return jsonify({"status": "success"}), 200
+    except Exception as e:
+        print(f"Bulk delete failed: {e}")
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/upload_image', methods=['POST'])
+@login_required
+def upload_image():
+    if 'image' not in request.files or 'barcode' not in request.form:
+        return jsonify({"error": "Missing data"}), 400
+    file = request.files['image']
+    barcode = request.form['barcode']
+    if file.filename == '' or not barcode:
+        return jsonify({"error": "Invalid data"}), 400
+    ext = mimetypes.guess_extension(file.mimetype) or '.jpg'
+    filename = f"{barcode}{ext}"
+    filepath = os.path.join(CACHE_DIR, filename)
+    file.save(filepath)
+    timestamp = int(time.time())
+    return jsonify({"status": "success", "image_url": f"/static/cache/{filename}?t={timestamp}"}), 200
+
 if __name__ == '__main__':
     init_db()
     socketio.run(app, host='0.0.0.0', port=5000, debug=True)

static/styleIndex.css

@@ -1,182 +0,0 @@
-:root {
-    /* Discord Light Mode Palette */
-    --bg: #ebedef;
-    --card-bg: #ffffff;
-    --text-main: #2e3338;
-    --text-muted: #4f5660;
-    --border: #e3e5e8;
-    --header-bg: #ffffff;
-    --input-bg: #e3e5e8;
-    --table-head: #f2f3f5;
-    --price-color: #2e3338;
-    --accent: #5865F2;
-    /* Discord Burple */
-    --accent-hover: #4752c4;
-    --danger: #ed4245;
-    --warning: #fee75c;
-}
-
-[data-theme="dark"] {
-    /* Discord Dark Mode Palette */
-    --bg: #36393f;
-    --card-bg: #2f3136;
-    --text-main: #ffffff;
-    --text-muted: #b9bbbe;
-    --border: #202225;
-    --header-bg: #202225;
-    --input-bg: #202225;
-    --table-head: #292b2f;
-    --price-color: #ffffff;
-}
-
-body {
-    font-family: 'gg sans', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
-    display: flex;
-    flex-direction: column;
-    padding: 20px;
-    background: var(--bg);
-    color: var(--text-main);
-    margin: 0;
-    transition: background 0.2s, color 0.2s;
-}
-
-.header-bar {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    background: var(--header-bg);
-    padding: 10px 25px;
-    border-radius: 8px;
-    margin-bottom: 20px;
-    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
-}
-
-.main-container {
-    display: flex;
-    gap: 25px;
-}
-
-.column {
-    flex: 1;
-    min-width: 400px;
-}
-
-.card {
-    background: var(--card-bg);
-    padding: 25px;
-    border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
-    text-align: center;
-    margin-bottom: 20px;
-    border: 1px solid var(--border);
-}
-
-#display-img {
-    max-width: 250px;
-    max-height: 250px;
-    border-radius: 4px;
-    margin-bottom: 15px;
-    object-fit: contain;
-}
-
-.price-tag {
-    font-size: 3em;
-    color: var(--price-color);
-    font-weight: 800;
-    margin: 10px 0;
-}
-
-input {
-    display: block;
-    width: 100%;
-    margin: 12px 0;
-    padding: 12px;
-    border: none;
-    border-radius: 4px;
-    box-sizing: border-box;
-    background: var(--input-bg);
-    color: var(--text-main);
-}
-
-button {
-    padding: 10px 15px;
-    cursor: pointer;
-    border-radius: 4px;
-    border: none;
-    transition: 0.2s;
-    font-weight: 500;
-}
-
-.btn-save {
-    background: var(--accent);
-    color: white;
-    width: 100%;
-    font-size: 1.1em;
-}
-
-.btn-save:hover {
-    background: var(--accent-hover);
-}
-
-.btn-edit {
-    background: var(--accent);
-    color: white;
-}
-
-.btn-del {
-    background: var(--danger);
-    color: white;
-}
-
-table {
-    width: 100%;
-    border-collapse: collapse;
-    background: var(--card-bg);
-    border-radius: 8px;
-    overflow: hidden;
-}
-
-th,
-td {
-    padding: 15px;
-    border-bottom: 1px solid var(--border);
-    text-align: left;
-}
-
-th {
-    background: var(--table-head);
-    color: var(--text-muted);
-    text-transform: uppercase;
-    font-size: 0.8em;
-    letter-spacing: 0.5px;
-}
-
-.theme-toggle-btn {
-    background: var(--text-main);
-    color: var(--bg);
-    font-weight: bold;
-}
-
-#new-product-prompt {
-    display: none;
-    background: var(--accent);
-    color: white;
-    padding: 12px 20px;
-    border-radius: 8px;
-    margin-bottom: 20px;
-    animation: slideDown 0.4s ease;
-    justify-content: space-between;
-    align-items: center;
-}
-
-@keyframes slideDown {
-    from {
-        transform: translateY(-20px);
-        opacity: 0;
-    }
-
-    to {
-        transform: translateY(0);
-        opacity: 1;
-    }
-}

static/styleLogin.css

@@ -1,98 +0,0 @@
-:root {
-    /* Discord Branding Colors */
-    --bg: #5865F2;
-    --card-bg: #ffffff;
-    --text: #2e3338;
-    --input-bg: #e3e5e8;
-    --input-border: transparent;
-    --accent: #5865F2;
-    --accent-hover: #4752c4;
-    --error: #ed4245;
-}
-
-[data-theme="dark"] {
-    /* Discord Dark Mode */
-    --bg: #36393f;
-    --card-bg: #2f3136;
-    --text: #ffffff;
-    --input-bg: #202225;
-    --input-border: transparent;
-}
-
-body {
-    font-family: 'gg sans', 'Segoe UI', Tahoma, sans-serif;
-    display: flex;
-    justify-content: center;
-    align-items: center;
-    height: 100vh;
-    background: var(--bg);
-    margin: 0;
-    transition: background 0.2s;
-}
-
-.login-box {
-    background: var(--card-bg);
-    padding: 32px;
-    border-radius: 8px;
-    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
-    text-align: center;
-    color: var(--text);
-    width: 400px;
-    transition: background 0.2s, color 0.2s;
-}
-
-h2 {
-    margin-top: 0;
-    font-weight: 700;
-    font-size: 24px;
-}
-
-p.sub-text {
-    color: var(--text);
-    opacity: 0.7;
-    margin-bottom: 20px;
-}
-
-input {
-    display: block;
-    width: 100%;
-    margin: 16px 0;
-    padding: 12px;
-    border: none;
-    border-radius: 4px;
-    background: var(--input-bg);
-    color: var(--text);
-    box-sizing: border-box;
-    font-size: 16px;
-}
-
-input:focus {
-    outline: 2px solid var(--accent);
-}
-
-button {
-    background: var(--accent);
-    color: white;
-    border: none;
-    padding: 12px 24px;
-    border-radius: 4px;
-    cursor: pointer;
-    font-size: 16px;
-    font-weight: 600;
-    width: 100%;
-    margin-top: 10px;
-    transition: background 0.2s;
-}
-
-button:hover {
-    background: var(--accent-hover);
-}
-
-.error-msg {
-    background: var(--error);
-    color: white;
-    padding: 8px;
-    border-radius: 4px;
-    font-size: 0.9em;
-    margin-bottom: 15px;
-}

templates/login.html

@@ -1,35 +1,172 @@
 <!DOCTYPE html>
-<html lang="es">
+<html lang="es" data-theme="light">
+
 <head>
     <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>SekiPOS Login</title>
     <link rel="shortcut icon" href="./static/favicon.png" type="image/x-icon">
-    <link rel="stylesheet" href="./static/styleLogin.css">
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
+    <style>
+        :root {
+            --bg: #5865f2;
+            --card-bg: #ffffff;
+            --text: #2e3338;
+            --input-bg: #e3e5e8;
+            --accent: #5865f2;
+            --accent-hover: #4752c4;
+            --error: #ed4245;
+        }
+
+        [data-theme="dark"] {
+            --bg: #36393f;
+            --card-bg: #2f3136;
+            --text: #ffffff;
+            --input-bg: #202225;
+        }
+
+        body {
+            background: var(--bg);
+            font-family: "gg sans", "Segoe UI", sans-serif;
+            min-height: 100vh;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            transition: background 0.2s;
+            margin: 0;
+            padding: 16px;
+        }
+
+        .login-box {
+            background: var(--card-bg);
+            color: var(--text);
+            border-radius: 8px;
+            padding: 2rem;
+            width: 100%;
+            max-width: 400px;
+            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
+            transition: background 0.2s, color 0.2s;
+        }
+
+        .form-control {
+            background: var(--input-bg) !important;
+            color: var(--text) !important;
+            border: none;
+        }
+
+        .form-control:focus {
+            box-shadow: 0 0 0 2px var(--accent);
+        }
+
+        .form-control::placeholder {
+            color: #8a8e94;
+        }
+
+        .btn-login {
+            background: var(--accent);
+            color: #fff;
+            border: none;
+            font-weight: 600;
+        }
+
+        .btn-login:hover {
+            background: var(--accent-hover);
+            color: #fff;
+        }
+
+        .error-alert {
+            background: var(--error);
+            color: #fff;
+            border-radius: 4px;
+            font-size: .88rem;
+        }
+    </style>
 </head>
+
 <body>
-    <div class="login-box">
-        <h2>SekiPOS</h2>
-        <p class="sub-text">¡Hola de nuevo!</p>
+    <div class="login-box text-center">
+        <h2 class="fw-bold mb-1">SekiPOS</h2>
+        <p class="mb-4" style="opacity:.7;">¡Hola de nuevo!</p>
 
         {% with messages = get_flashed_messages() %}
-          {% if messages %}
-            <div class="error-msg">{{ messages[0] }}</div>
-          {% endif %}
+        {% if messages %}
+        <div class="error-alert p-2 mb-3">{{ messages[0] }}</div>
+        {% endif %}
         {% endwith %}
 
         <form method="POST">
-            <input type="text" name="username" placeholder="Usuario" required>
-            <input type="password" name="password" placeholder="Contraseña" required>
-            <button type="submit">Iniciar Sesión</button>
+            <input class="form-control mb-3" type="text" name="username" placeholder="Usuario" required autofocus>
+            <input class="form-control mb-3" type="password" name="password" placeholder="Contraseña" required>
+            <button type="submit" class="btn btn-login w-100">
+                Iniciar Sesión
+            </button>
         </form>
     </div>
 
     <script>
-        // Sync theme with main page
-        const savedTheme = localStorage.getItem('theme') || 'light';
-        if (savedTheme === 'dark') {
-            document.documentElement.setAttribute('data-theme', 'dark');
+        /* ── Theme Management ── */
+
+        // Helper to set a cookie
+        function setCookie(name, value, days = 365) {
+            const d = new Date();
+            d.setTime(d.getTime() + (days * 24 * 60 * 60 * 1000));
+            let expires = "expires=" + d.toUTCString();
+            document.cookie = name + "=" + value + ";" + expires + ";path=/;SameSite=Lax";
         }
+
+        // Helper to get a cookie
+        function getCookie(name) {
+            let nameEQ = name + "=";
+            let ca = document.cookie.split(';');
+            for (let i = 0; i < ca.length; i++) {
+                let c = ca[i];
+                while (c.charAt(0) == ' ') c = c.substring(1, c.length);
+                if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
+            }
+            return null;
+        }
+
+        function applyTheme(t) {
+            document.documentElement.setAttribute('data-theme', t);
+            const isDark = t === 'dark';
+            const themeIcon = document.getElementById('theme-icon');
+            const themeLabel = document.getElementById('theme-label');
+
+            if (themeIcon) themeIcon.className = isDark ? 'bi bi-sun me-2' : 'bi bi-moon-stars me-2';
+            if (themeLabel) themeLabel.innerText = isDark ? 'Modo Claro' : 'Modo Oscuro';
+
+            setCookie('theme', t);
+        }
+
+        function toggleTheme() {
+            const current = document.documentElement.getAttribute('data-theme');
+            const next = current === 'dark' ? 'light' : 'dark';
+            applyTheme(next);
+        }
+
+        // Initialization Logic
+        function initTheme() {
+            const savedTheme = getCookie('theme');
+
+            if (savedTheme) {
+                // Use user preference if it exists
+                applyTheme(savedTheme);
+            } else {
+                // Otherwise, detect OS preference
+                const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+                applyTheme(prefersDark ? 'dark' : 'light');
+            }
+        }
+
+        // Listen for OS theme changes in real-time if no cookie is set
+        window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => {
+            if (!getCookie('theme')) {
+                applyTheme(e.matches ? 'dark' : 'light');
+            }
+        });
+
+        initTheme();
     </script>
 </body>
+
 </html>