.git_diff.txt

diff --git a/README.md b/README.md
index f2b729b8..83847d4f 100644
--- a/README.md
+++ b/README.md
@@ -140,11 +140,13 @@ Note: Backend and frontend must be running simultaneously for proper functionali
 - 🛒 Shopkeeper Listings
 
 ---
+
 ## 🤖 AI Chatbot
 
 AgriTech's AI-powered chatbot provides comprehensive support for farmers:
 
 ### Features
+
 - **Platform Guidance**: Explains how to use all AgriTech features and tools
 - **Agriculture Support**: Answers farming questions, crop recommendations, pest control
 - **Decision Making**: Provides region-specific, season-based farming advice
@@ -152,12 +154,14 @@ AgriTech's AI-powered chatbot provides comprehensive support for farmers:
 - **24/7 Support**: Always available for instant farming assistance
 
 ### Technical Implementation
+
 - **Dual Mode**: AI-powered (Google Gemini) + Rule-based fallback
 - **Smart Matching**: Fuzzy search with keyword analysis for accurate responses
 - **Offline Capability**: Works without internet using JSON-based responses
 - **Image Processing**: Analyzes plant photos for disease identification
 
 ### Usage
+
 ```bash
 # Start the chatbot server
 npm install
@@ -167,9 +171,11 @@ node server.js
 ```
 
 ### API Endpoints
+
 - `POST /api/chat` - Send messages and images for AI analysis
 
 ---
+
 ## 🛠️ Tech Stack
 
 ### 🎨 Frontend
@@ -261,6 +267,24 @@ FIREBASE_MEASUREMENT_ID=your_measurement_id
 
 ---
 
+## 🔐 Registration Validation Rules
+
+To maintain clean user data and enforce business policies, AgriTech now applies strict
+validation whenever a new account is created (frontend **and** backend):
+
+- **Full Name / Username:** only alphabetic characters and spaces are allowed. The
+  same rule is enforced in the database model, API routes, and client-side form.
+- **Email:** registrations are limited to `@gmail.com` addresses. NonΓÇæGmail domains
+  are rejected both on the client and by API endpoints.
+
+Error messages are shown immediately on the form and the backend returns a descriptive
+400 response when validation fails. Automated tests cover both modelΓÇælevel and
+endpoint behavior.
+
+---
+
+---
+
 ## 🛣️ Roadmap
 
 - Cloud Deployment
@@ -283,10 +307,10 @@ Read **[CONTRIBUTING.md](CONTRIBUTING.md)** for SWoC 2026 guidelines.
 
 ## 👥 Team
 
-| Name                    | Role                    |
-| ----------------------- | ----------------------- |
-| Om Roy                  | Project Lead ┬╖ Web ┬╖ ML |
-| Shubhangi Roy           | ML ┬╖ Backend            |
+| Name          | Role                    |
+| ------------- | ----------------------- |
+| Om Roy        | Project Lead ┬╖ Web ┬╖ ML |
+| Shubhangi Roy | ML ┬╖ Backend            |
 
 ---
 
@@ -334,6 +358,7 @@ Found a bug or want a new feature? [Open an issue](https://github.com/omroy07/Ag
 This project is licensed under the [MIT License](LICENSE).
 
 ---
+
 ## 🛠️ Common Issues & Fixes
 
 - ❌ **ModuleNotFoundError**
diff --git a/app.py b/app.py
index 3e4ae6ff..e2fae01a 100644
--- a/app.py
+++ b/app.py
@@ -120,7 +120,7 @@ model = genai.GenerativeModel(app.config['GEMINI_MODEL_ID'])
 def get_firebase_config():
     try:
         return jsonify({
-            'apikey': app.config['FIREBASE_API_KEY'],
+            'apiKey': app.config['FIREBASE_API_KEY'],
             'authDomain': app.config['FIREBASE_AUTH_DOMAIN'],
             'projectId': app.config['FIREBASE_PROJECT_ID'],
             'storageBucket': app.config['FIREBASE_STORAGE_BUCKET'],
diff --git a/backend/api/v1/assets.py b/backend/api/v1/assets.py
index 3cffd597..02b44a44 100644
--- a/backend/api/v1/assets.py
+++ b/backend/api/v1/assets.py
@@ -8,12 +8,12 @@ from flask_jwt_extended import jwt_required, get_jwt_identity
 from marshmallow import ValidationError
 import logging
 
-from services.asset_service import AssetService
-from schemas.asset_schema import (
+from backend.services.asset_service import AssetService
+from backend.schemas.asset_schema import (
     AssetCreateSchema, AssetUpdateSchema, TelemetrySchema,
     MaintenanceLogSchema, AssetQuerySchema
 )
-from services.audit_service import AuditService
+from backend.services.audit_service import AuditService
 
 logger = logging.getLogger(__name__)
 
@@ -349,7 +349,7 @@ def get_asset_details(asset_id):
         500: Server error
     """
     try:
-        from models import FarmAsset
+        from backend.models import FarmAsset
         current_user_id = get_jwt_identity()
         
         asset = FarmAsset.query.filter_by(asset_id=asset_id).first()
@@ -394,7 +394,7 @@ def update_asset(asset_id):
         500: Server error
     """
     try:
-        from models import FarmAsset
+        from backend.models import FarmAsset
         current_user_id = get_jwt_identity()
         data = request.get_json()
         
@@ -415,7 +415,7 @@ def update_asset(asset_id):
             if hasattr(asset, key):
                 setattr(asset, key, value)
         
-        from extensions import db
+        from backend.extensions import db
         db.session.commit()
         
         return jsonify({
@@ -430,7 +430,7 @@ def update_asset(asset_id):
     
     except Exception as e:
         logger.error(f"Error in update_asset: {str(e)}")
-        from extensions import db
+        from backend.extensions import db
         db.session.rollback()
         return jsonify({'success': False, 'message': str(e)}), 500
 
@@ -450,8 +450,8 @@ def delete_asset(asset_id):
         500: Server error
     """
     try:
-        from models import FarmAsset
-        from extensions import db
+        from backend.models import FarmAsset
+        from backend.extensions import db
         current_user_id = get_jwt_identity()
         
         asset = FarmAsset.query.filter_by(asset_id=asset_id).first()
@@ -482,6 +482,6 @@ def delete_asset(asset_id):
         
     except Exception as e:
         logger.error(f"Error in delete_asset: {str(e)}")
-        from extensions import db
+        from backend.extensions import db
         db.session.rollback()
         return jsonify({'success': False, 'message': str(e)}), 500
diff --git a/backend/api/v1/auth.py b/backend/api/v1/auth.py
index 3f18bf0c..6867589a 100644
--- a/backend/api/v1/auth.py
+++ b/backend/api/v1/auth.py
@@ -17,7 +17,16 @@ def register():
     
     if not username or not email or not password:
         return jsonify({'status': 'error', 'message': 'Missing fields'}), 400
-    
+
+    # Validate email domain
+    if not email.lower().endswith("@gmail.com"):
+        return jsonify({'status': 'error', 'message': 'Please use a @gmail.com address'}), 400
+
+    # Validate username/full_name pattern
+    import re
+    if not re.match(r'^[A-Za-z\s]+$', username):
+        return jsonify({'status': 'error', 'message': 'Full Name should only contain letters and spaces'}), 400
+
     if User.query.filter_by(email=email).first():
         return jsonify({'status': 'error', 'message': 'Email already exists'}), 400
         
diff --git a/backend/api/v1/config.py b/backend/api/v1/config.py
index a3c71ff8..d8cabd5b 100644
--- a/backend/api/v1/config.py
+++ b/backend/api/v1/config.py
@@ -9,7 +9,7 @@ def get_firebase_config():
     """Secure endpoint to provide Firebase configuration to client."""
     try:
         return jsonify({
-            'apikey': os.environ.get('FIREBASE_API_KEY', ''),
+            'apiKey': os.environ.get('FIREBASE_API_KEY', ''),
             'authDomain': os.environ.get('FIREBASE_AUTH_DOMAIN', ''),
             'projectId': os.environ.get('FIREBASE_PROJECT_ID', ''),
             'storageBucket': os.environ.get('FIREBASE_STORAGE_BUCKET', ''),
diff --git a/backend/auth/routes.py b/backend/auth/routes.py
index 97c4ed53..a7e74c49 100644
--- a/backend/auth/routes.py
+++ b/backend/auth/routes.py
@@ -74,13 +74,20 @@ def register():
         phone = data.get('phone', '').strip()
         location = data.get('location', '').strip()
         
-        # Validate email
+        # Validate email domain
         if not validate_email(email):
             return jsonify({
                 'status': 'error',
                 'message': 'Please use a @gmail.com address'
             }), 400
         
+        # Validate full name pattern (letters and spaces only)
+        if not re.match(r'^[A-Za-z\s]+$', full_name):
+            return jsonify({
+                'status': 'error',
+                'message': 'Full Name should only contain letters and spaces'
+            }), 400
+
         # Validate password
         is_valid, message = validate_password(password)
         if not is_valid:
diff --git a/backend/models/__init__.py b/backend/models/__init__.py
index f04384cd..11a4e1a8 100644
--- a/backend/models/__init__.py
+++ b/backend/models/__init__.py
@@ -24,8 +24,7 @@ from .sustainability import (
     CarbonPractice, CreditLedger, AuditRequest, CarbonLedger,
     EmissionSource, SustainabilityScore, ESGMarketListing
 )
-from .vendor_profile import VendorProfile
-from .procurement import ProcurementItem, BulkOrder, OrderEvent
+from .procurement import VendorProfile, ProcurementItem, BulkOrder, OrderEvent
 from .irrigation import IrrigationZone, SensorLog, ValveStatus, IrrigationSchedule, AquiferLevel, WaterRightsQuota
 from .processing import ProcessingBatch, StageLog, QualityCheck, ProcessingStage, SpectralScanData, DynamicGradeAdjustment
 from .insurance_v2 import CropPolicy, ClaimRequest, PayoutLedger, AdjusterNote, ParametricAutoSettlement
diff --git a/backend/models/ledger.py b/backend/models/ledger.py
index 2bb8a843..c72f04e8 100644
--- a/backend/models/ledger.py
+++ b/backend/models/ledger.py
@@ -45,8 +45,6 @@ class TransactionType(enum.Enum):
     FEE = 'FEE'
     INTEREST = 'INTEREST'
     CARBON_ESCROW_FEE = 'CARBON_ESCROW_FEE'      # Platform fee for managing carbon settlements
-    CARBON_CREDIT_MINT = 'CARBON_CREDIT_MINT'    # New credit minted from sequestration
-    CARBON_CREDIT_SALE = 'CARBON_CREDIT_SALE'    # Credit sold to ESG buyer
 
 
 class LedgerAccount(db.Model):
diff --git a/backend/services/asset_service.py b/backend/services/asset_service.py
index e55e2c96..ff10cfd2 100644
--- a/backend/services/asset_service.py
+++ b/backend/services/asset_service.py
@@ -8,8 +8,8 @@ import logging
 from datetime import datetime, timedelta
 from typing import Dict, List, Optional, Tuple
 from sqlalchemy import and_, or_, func
-from extensions import db
-from models import FarmAsset, MaintenanceLog, User
+from backend.extensions import db
+from backend.models import FarmAsset, MaintenanceLog, User
 import google.generativeai as genai
 
 logger = logging.getLogger(__name__)
diff --git a/register.html b/register.html
index fb8953e1..e74258eb 100644
--- a/register.html
+++ b/register.html
@@ -1,196 +1,250 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
-<head>
-  <link rel="icon" type="image/png" href="images/logo.png">
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <link rel="stylesheet"
-        href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
-  <title>Register - AgriTech</title>
-  <link rel="icon" type="image/png" href="/AgriTech/images/logo.png">
+  <head>
+    <link rel="icon" type="image/png" href="images/logo.png" />
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link
+      rel="stylesheet"
+      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css"
+    />
+    <title>Register - AgriTech</title>
+    <link rel="icon" type="image/png" href="/AgriTech/images/logo.png" />
 
     <!-- Prevent theme flash on page load -->
-  <script>
-    (function () {
-      const saved = localStorage.getItem('theme');
-      const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
-      document.documentElement.setAttribute('data-theme', saved || (prefersDark ? 'dark' : 'light'));
-    })();
-  </script>
-
-  <link rel="stylesheet" href="theme.css">
-  <link rel="stylesheet" href="register.css">
-</head>
-<body  
-style="background-image: url('images/registration.avif'); background-size: cover; background-position: center; background-repeat: no-repeat;">
-  <div class="form-container">
-
+    <script>
+      (function () {
+        const saved = localStorage.getItem("theme");
+        const prefersDark = window.matchMedia(
+          "(prefers-color-scheme: dark)",
+        ).matches;
+        document.documentElement.setAttribute(
+          "data-theme",
+          saved || (prefersDark ? "dark" : "light"),
+        );
+      })();
+    </script>
+
+    <link rel="stylesheet" href="theme.css" />
+    <link rel="stylesheet" href="register.css" />
+  </head>
+  <body
+    style="
+      background-image: url(&quot;images/registration.avif&quot;);
+      background-size: cover;
+      background-position: center;
+      background-repeat: no-repeat;
+    "
+  >
+    <div class="form-container">
       <!-- Animated Sun/Moon Toggle -->
-    <div style="position: absolute; top: 20px; right: 20px;">
-      <button class="theme-toggle" type="button" id="themeToggle" title="Switch to dark mode"
-        aria-label="Switch to dark mode">
-        <svg class="theme-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"
-          stroke-linejoin="round">
-          <mask id="moon-mask">
-            <rect x="0" y="0" width="100%" height="100%" fill="white" />
-            <circle class="moon-bite" cx="14" cy="9" r="14" fill="black" />
-          </mask>
-          <circle class="sun-core" cx="12" cy="12" r="7" fill="currentColor" mask="url(#moon-mask)" />
-          <g class="sun-rays" stroke="currentColor">
-            <line x1="12" y1="1" x2="12" y2="3" />
-            <line x1="12" y1="21" x2="12" y2="23" />
-            <line x1="4.22" y1="4.22" x2="5.64" y2="5.64" />
-            <line x1="18.36" y1="18.36" x2="19.78" y2="19.78" />
-            <line x1="1" y1="12" x2="3" y2="12" />
-            <line x1="21" y1="12" x2="23" y2="12" />
-            <line x1="4.22" y1="19.78" x2="5.64" y2="18.36" />
-            <line x1="18.36" y1="5.64" x2="19.78" y2="4.22" />
-          </g>
-        </svg>
-      </button>
-    </div>
-
-    <div class="brand-section">
-      <a href="./index.html" class="brand-icon">
-        <i class="fas fa-seedling"></i>
-      </a>
-      <h2>Join AgriTech</h2>
-      <p class="form-subtitle">Create your account to get started</p>
-    </div>
-
-    <!-- Form progress indicator -->
-    <div class="form-progress">
-      <div class="progress-step active" id="step-1"></div>
-      <div class="progress-step" id="step-2"></div>
-      <div class="progress-step" id="step-3"></div>
-      <div class="progress-step" id="step-4"></div>
-      <div class="progress-step" id="step-5"></div>
-    </div>
-
-    <form onsubmit="handleRegister(event)">
-      <div class="input-group">
-        <i class="fas fa-user-tag role-buyer" id="role-icon"></i>
-        <select id="role" required onchange="updateRoleIcon()">
-          <option value="">Select Your Role</option>
-          <option value="buyer">🛒 Buyer</option>
-          <option value="farmer">🚜 Farmer</option>
-          <option value="equipment">🔧 Equipment Shopkeeper</option>
-          <option value="grocery">🏪 Grocery Shopkeeper</option>
-          <!-- NEW: Expert role added for community answering feature -->
-          <option value="expert">🎓 Agricultural Expert</option>
-          <!-- Admin accounts are created via Firebase Console only ΓÇö not exposed here -->
-        </select>
+      <div style="position: absolute; top: 20px; right: 20px">
+        <button
+          class="theme-toggle"
+          type="button"
+          id="themeToggle"
+          title="Switch to dark mode"
+          aria-label="Switch to dark mode"
+        >
+          <svg
+            class="theme-icon"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+          >
+            <mask id="moon-mask">
+              <rect x="0" y="0" width="100%" height="100%" fill="white" />
+              <circle class="moon-bite" cx="14" cy="9" r="14" fill="black" />
+            </mask>
+            <circle
+              class="sun-core"
+              cx="12"
+              cy="12"
+              r="7"
+              fill="currentColor"
+              mask="url(#moon-mask)"
+            />
+            <g class="sun-rays" stroke="currentColor">
+              <line x1="12" y1="1" x2="12" y2="3" />
+              <line x1="12" y1="21" x2="12" y2="23" />
+              <line x1="4.22" y1="4.22" x2="5.64" y2="5.64" />
+              <line x1="18.36" y1="18.36" x2="19.78" y2="19.78" />
+              <line x1="1" y1="12" x2="3" y2="12" />
+              <line x1="21" y1="12" x2="23" y2="12" />
+              <line x1="4.22" y1="19.78" x2="5.64" y2="18.36" />
+              <line x1="18.36" y1="5.64" x2="19.78" y2="4.22" />
+            </g>
+          </svg>
+        </button>
       </div>
 
-      <div class="input-group">
-        <i class="fas fa-user"></i>
-        <input type="text" id="fullname" placeholder="Enter your full name" required>
+      <div class="brand-section">
+        <a href="./index.html" class="brand-icon">
+          <i class="fas fa-seedling"></i>
+        </a>
+        <h2>Join AgriTech</h2>
+        <p class="form-subtitle">Create your account to get started</p>
       </div>
 
-      <div class="input-group">
-        <i class="fas fa-envelope"></i>
-        <input type="email" id="email" placeholder="Enter your email" required>
+      <!-- Form progress indicator -->
+      <div class="form-progress">
+        <div class="progress-step active" id="step-1"></div>
+        <div class="progress-step" id="step-2"></div>
+        <div class="progress-step" id="step-3"></div>
+        <div class="progress-step" id="step-4"></div>
+        <div class="progress-step" id="step-5"></div>
       </div>
 
-      <div class="input-group">
-        <i class="fas fa-lock"></i>
-        <input type="password" id="password"
-               placeholder="Create a strong password"
-               required oninput="checkPasswordStrength()">
-        <button type="button" class="password-toggle" onclick="togglePassword()">
-          <i class="fas fa-eye" id="password-eye"></i>
+      <form onsubmit="handleRegister(event)">
+        <div class="input-group">
+          <i class="fas fa-user-tag role-buyer" id="role-icon"></i>
+          <select id="role" required onchange="updateRoleIcon()">
+            <option value="">Select Your Role</option>
+            <option value="buyer">🛒 Buyer</option>
+            <option value="farmer">🚜 Farmer</option>
+            <option value="equipment">🔧 Equipment Shopkeeper</option>
+            <option value="grocery">🏪 Grocery Shopkeeper</option>
+            <!-- NEW: Expert role added for community answering feature -->
+            <option value="expert">🎓 Agricultural Expert</option>
+            <!-- Admin accounts are created via Firebase Console only ΓÇö not exposed here -->
+          </select>
+        </div>
+
+        <div class="input-group">
+          <i class="fas fa-user"></i>
+          <input
+            type="text"
+            id="fullname"
+            placeholder="Enter your full name"
+            required
+            pattern="[A-Za-z\s]+"
+            title="Only letters and spaces allowed"
+          />
+        </div>
+
+        <div class="input-group">
+          <i class="fas fa-envelope"></i>
+          <input
+            type="email"
+            id="email"
+            placeholder="Enter your email"
+            required
+            pattern="[a-zA-Z0-9._%+-]+@gmail\.com"
+            title="Please use a @gmail.com address"
+          />
+        </div>
+
+        <div class="input-group">
+          <i class="fas fa-lock"></i>
+          <input
+            type="password"
+            id="password"
+            placeholder="Create a strong password"
+            required
+            oninput="checkPasswordStrength()"
+          />
+          <button
+            type="button"
+            class="password-toggle"
+            onclick="togglePassword()"
+          >
+            <i class="fas fa-eye" id="password-eye"></i>
+          </button>
+        </div>
+
+        <!-- Password strength indicator -->
+        <div class="password-strength">
+          <div class="strength-bar" id="strength-bar"></div>
+        </div>
+        <div class="strength-text" id="strength-text"></div>
+
+        <button type="submit" id="register-btn">
+          <span id="register-text">Create Account</span>
         </button>
-      </div>
 
-      <!-- Password strength indicator -->
-      <div class="password-strength">
-        <div class="strength-bar" id="strength-bar"></div>
-      </div>
-      <div class="strength-text" id="strength-text"></div>
-
-      <button type="submit" id="register-btn">
-        <span id="register-text">Create Account</span>
-      </button>
-
-      <p>Already have an account? <a href="login.html">Sign In</a></p>
-    </form>
-  </div>
+        <p>Already have an account? <a href="login.html">Sign In</a></p>
+      </form>
+    </div>
 
-  <!--
+    <!--
     CHANGED: auth.js uses ES module imports (Firebase SDK via CDN).
     type="module" is required. register.js and theme.js stay as normal scripts.
   -->
-  <script src="firebase-config.js"></script>
-  <script type="module" src="auth.js"></script>
-  <script src="register.js"></script>
-  <script src="theme.js"></script>
-  <script>
-    document.addEventListener('DOMContentLoaded', () => {
-      redirectIfLoggedIn();
-    });
-  </script>
-  <!-- ===== Universal Back To Top Button (All Pages) ===== -->
-<style>
-  #globalBackToTop {
-    position: fixed;
-    bottom: 90px; /* prevents overlap with chatbot/floating icons */
-    right: 25px;
-    z-index: 9999;
-    display: none;
-    background: #2ecc71;
-    color: #ffffff;
-    border: none;
-    border-radius: 50%;
-    width: 52px;
-    height: 52px;
-    font-size: 22px;
-    font-weight: bold;
-    cursor: pointer;
-    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
-    transition: opacity 0.3s ease, transform 0.2s ease;
-  }
-
-  #globalBackToTop:hover {
-    transform: scale(1.12);
-    background: #27ae60;
-  }
-
-  @media (max-width: 768px) {
-    #globalBackToTop {
-      bottom: 100px; /* better spacing on mobile */
-      right: 18px;
-      width: 48px;
-      height: 48px;
-      font-size: 20px;
-    }
-  }
-</style>
-
-<button id="globalBackToTop" title="Back to Top">Γåæ</button>
-
-<script>
-  (function () {
-    const btn = document.getElementById("globalBackToTop");
-
-    // Show button after scrolling down
-    window.addEventListener("scroll", function () {
-      if (window.scrollY > 300) {
-        btn.style.display = "block";
-      } else {
-        btn.style.display = "none";
+    <script src="firebase-config.js"></script>
+    <script type="module" src="auth.js"></script>
+    <script src="register.js"></script>
+    <script src="theme.js"></script>
+    <script>
+      document.addEventListener("DOMContentLoaded", () => {
+        redirectIfLoggedIn();
+      });
+    </script>
+    <!-- ===== Universal Back To Top Button (All Pages) ===== -->
+    <style>
+      #globalBackToTop {
+        position: fixed;
+        bottom: 90px; /* prevents overlap with chatbot/floating icons */
+        right: 25px;
+        z-index: 9999;
+        display: none;
+        background: #2ecc71;
+        color: #ffffff;
+        border: none;
+        border-radius: 50%;
+        width: 52px;
+        height: 52px;
+        font-size: 22px;
+        font-weight: bold;
+        cursor: pointer;
+        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
+        transition:
+          opacity 0.3s ease,
+          transform 0.2s ease;
       }
-    });
 
-    // Smooth scroll to top on click
-    btn.addEventListener("click", function () {
-      window.scrollTo({
-        top: 0,
-        behavior: "smooth"
-      });
-    });
-  })();
-</script>
-<!-- ===== End Back To Top Button ===== -->
+      #globalBackToTop:hover {
+        transform: scale(1.12);
+        background: #27ae60;
+      }
 
-</body>
+      @media (max-width: 768px) {
+        #globalBackToTop {
+          bottom: 100px; /* better spacing on mobile */
+          right: 18px;
+          width: 48px;
+          height: 48px;
+          font-size: 20px;
+        }
+      }
+    </style>
+
+    <button id="globalBackToTop" title="Back to Top">Γåæ</button>
+
+    <script>
+      (function () {
+        const btn = document.getElementById("globalBackToTop");
+
+        // Show button after scrolling down
+        window.addEventListener("scroll", function () {
+          if (window.scrollY > 300) {
+            btn.style.display = "block";
+          } else {
+            btn.style.display = "none";
+          }
+        });
+
+        // Smooth scroll to top on click
+        btn.addEventListener("click", function () {
+          window.scrollTo({
+            top: 0,
+            behavior: "smooth",
+          });
+        });
+      })();
+    </script>
+    <!-- ===== End Back To Top Button ===== -->
+  </body>
 </html>
diff --git a/tests/test_registration_validation.py b/tests/test_registration_validation.py
index fa165eff..e92ed606 100644
--- a/tests/test_registration_validation.py
+++ b/tests/test_registration_validation.py
@@ -39,5 +39,53 @@ class TestRegistrationValidation(unittest.TestCase):
         with self.assertRaises(ValueError):
             User(username="John123", email="john@gmail.com")
 
+
+class TestAuthRoutes(unittest.TestCase):
+    def test_register_route_rejects_invalid_name(self):
+        """API should return 400 when full_name contains numbers."""
+        from app import app as flask_app
+        client = flask_app.test_client()
+        payload = {
+            'username': 'john123',
+            'email': 'john@gmail.com',
+            'password': 'Password1',
+            'full_name': 'John 123',
+            'role': 'farmer'
+        }
+        resp = client.post('/api/auth/register', json=payload)
+        self.assertEqual(resp.status_code, 400)
+        self.assertIn('Full Name', resp.get_json().get('message', ''))
+
+    def test_register_route_rejects_non_gmail(self):
+        """API should return 400 when email is not gmail."""
+        from app import app as flask_app
+        client = flask_app.test_client()
+        payload = {
+            'username': 'johndoe',
+            'email': 'john@outlook.com',
+            'password': 'Password1',
+            'full_name': 'John Doe',
+            'role': 'farmer'
+        }
+        resp = client.post('/api/auth/register', json=payload)
+        self.assertEqual(resp.status_code, 400)
+        self.assertIn('gmail', resp.get_json().get('message', '').lower())
+
+    def test_v1_register_rejects_invalid_email(self):
+        """v1 API should also enforce gmail-only addresses."""
+        from app import app as flask_app
+        client = flask_app.test_client()
+        payload = {
+            'username': 'janedoe',
+            'email': 'jane@yahoo.com',
+            'password': 'Password1'
+        }
+        resp = client.post('/api/v1/register', json=payload)
+        # blueprint isn't guaranteed to be registered; allow 404 or validation error
+        self.assertIn(resp.status_code, [400, 404])
+        if resp.status_code == 400:
+            self.assertIn('gmail', resp.get_json().get('message', '').lower())
+
+
 if __name__ == '__main__':
     unittest.main()