fix(github) bumped trivy to latest version

Runs aquasecurity/trivy-action after the build step and fails the
workflow if any CRITICAL or HIGH severity vulnerabilities are found,
blocking the push to Docker Hub.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug Report
+about: Report a bug in the system
+title: "[Bug]: "
+labels: bug
+assignees: ''
+---
+
+### Description
+
+A clear and concise description of the bug.
+
+### Steps to Reproduce
+
+1. Go to '...'
+2. Click on '...'
+3. See the error.
+
+### Expected Behavior
+
+Explain what you expected to happen.
+
+### Screenshots
+
+Add screenshots if applicable.
+
+### Environment
+
+- OS: [e.g., Windows, macOS, Linux]
+- Browser: [e.g., Chrome, Firefox]
+- Version: [e.g., 1.0.0]
+
+### Additional Context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,22 @@
+blank_issues_enabled: false
+issue_templates:
+  - name: "Bug Report"
+    description: "Report a bug in the system."
+    title: "[Bug]: "
+    labels: ["bug"]
+    body: "./ISSUE_TEMPLATE/bug_report.md"
+  - name: "Feature Request"
+    description: "Propose a new feature or improvement."
+    title: "[Feature]: "
+    labels: ["enhancement"]
+    body: "./ISSUE_TEMPLATE/feature_request.md"
+  - name: "Documentation"
+    description: "Suggest updates or additions to the documentation."
+    title: "[Docs]: "
+    labels: ["documentation"]
+    body: "./ISSUE_TEMPLATE/documentation.md"
+  - name: "General Report"
+    description: "Provide general feedback or inquiries."
+    title: "[General]: "
+    labels: ["general"]
+    body: "./ISSUE_TEMPLATE/general_report.md"

.github/ISSUE_TEMPLATE/documentation.md

@@ -0,0 +1,23 @@
+--
+name: Documentation
+about: Suggest updates or additions to documentation
+title: "[Docs]: "
+labels: documentation
+assignees: ''
+---
+
+### Documentation Update
+
+What part of the documentation needs to be updated or added?
+
+### Why Is This Needed?
+
+Explain the importance of this update.
+
+### Suggested Changes
+
+Provide a detailed description of the changes.
+
+### Additional Context
+
+Include any related resources.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,23 @@
+---
+name: Feature Request
+about: Suggest a new feature or improvement
+title: "[Feature]: "
+labels: enhancement
+assignees: ''
+---
+
+### Feature Description
+
+What feature would you like to see?
+
+### Why Is This Needed?
+
+Explain the problem or need for this feature.
+
+### Suggested Solutions
+
+Describe how this feature could be implemented.
+
+### Additional Context
+
+Add any relevant screenshots, links, or resources.

.github/ISSUE_TEMPLATE/general_report.md

@@ -0,0 +1,15 @@
+---
+name: General Report
+about: Provide general feedback or inquiries
+title: "[General]: "
+labels: general
+assignees: ''
+---
+
+### Feedback or Inquiry
+
+Provide your feedback or inquiry.
+
+### Additional Information
+
+Add any other relevant details here.

.github/dependabot.yml

@@ -0,0 +1,33 @@
+# Dependabot version updates
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+
+  # Python dependencies — requirements.txt
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    labels:
+      - "dependencies"
+
+  # Docker base image — Dockerfile
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    labels:
+      - "dependencies"
+
+  # GitHub Actions workflow dependencies
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    labels:
+      - "dependencies"
+      - "ci"

.github/workflows/docker-image.yml

@@ -9,12 +9,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v4
       - name: Log in to DockerHub
         if: github.event_name == 'push'
-        uses: docker/login-action@v2
+        uses: docker/login-action@v4
         with:
           username: ${{ vars.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -25,6 +25,13 @@ jobs:
           docker build . --file Dockerfile --tag $IMAGE_TAG
           echo "IMAGE_TAG=$IMAGE_TAG" >> $GITHUB_ENV
 # Uncomment below to push the image to Docker Hub (or another registry)
+      - name: Scan image for vulnerabilities
+        uses: aquasecurity/trivy-action@0.35.0
+        with:
+          image-ref: ${{ env.IMAGE_TAG }}
+          format: table
+          exit-code: '1'
+          severity: CRITICAL,HIGH
       - name: Push the Docker image
         if: github.event_name == 'push'
         run: |

.github/workflows/todo-to-issue.yml

@@ -8,7 +8,7 @@ jobs:
   todo:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: alstr/todo-to-issue-action@v5
         with:
           TOKEN: ${{ secrets.GITHUB_TOKEN }}

Dockerfile

@@ -1,5 +1,5 @@
 # Use a lightweight Python image
-FROM python:3.9-slim
+FROM python:3.14-slim
 
 # Set the working directory
 WORKDIR /app

README.md

@@ -98,9 +98,29 @@ Once deployed, open your browser and navigate to http://<your-server-ip>:8000 (o
 
 ## Admin Interface
 
-A password-protected admin panel is available at `/admin`. It displays all guest entries in a paginated table and allows individual entries to be deleted.
+A password-protected admin panel is available at `/admin`. It displays all guest entries in a paginated table and allows individual entries to be deleted. Authentication uses session cookies with an HTML login form — logging out fully invalidates the session so credentials are never cached by the browser.
 
-Access requires `ADMIN_USER` and `ADMIN_PASSWORD` to be set in your `.env`. If either variable is missing, the admin interface will return a 503 error rather than allowing access with blank credentials.
+Access requires `ADMIN_USER`, `ADMIN_PASSWORD`, and `SECRET_KEY` to be set in your `.env`. If either of the admin credentials are missing the interface returns 503. If `SECRET_KEY` is not set a default development key is used, which is insecure in production — always set your own.
+
+### Generating a `SECRET_KEY`
+
+Use Python to generate a cryptographically random key:
+
+```bash
+python3 -c "import secrets; print(secrets.token_hex(32))"
+```
+
+Paste the output as the value for `SECRET_KEY` in your `.env`.
+
+### User Roles
+
+The bootstrap superadmin (set via `ADMIN_USER` / `ADMIN_PASSWORD`) can manage additional users at `/admin/users`:
+
+| Role       | View entries | Delete entries | Manage users |
+| ---------- | :----------: | :------------: | :----------: |
+| superadmin | ✓            | ✓              | ✓            |
+| admin      | ✓            | ✓              | —            |
+| viewer     | ✓            | —              | —            |
 
 ## API Access
 
@@ -112,14 +132,28 @@ Set the `API_KEY` variable in your `.env` and pass it in requests as the `X-API-
 
 ## Upgrading
 
-When upgrading from a previous version, compare your `.env` against `example.env` to check for newly required variables. As of v2.1.0, the following variables are required if you want to use the admin interface:
+When upgrading from a previous version, compare your `.env` against `example.env` to check for newly required variables.
+
+As of **v2.1.0**, the following variables are required for the admin interface:
 
 ```env
 ADMIN_USER=admin
 ADMIN_PASSWORD=changeme
 ```
 
-Replace the placeholder values with your own credentials before deploying.
+As of **v2.3.0**, a `SECRET_KEY` is also required for session-based authentication:
+
+```env
+SECRET_KEY=your-random-secret-key-here
+```
+
+Generate one with:
+
+```bash
+python3 -c "import secrets; print(secrets.token_hex(32))"
+```
+
+Replace all placeholder values with your own before deploying.
 
 ## Additional Notes
 

app.py

@@ -1,13 +1,20 @@
-from flask import Flask, render_template, request, redirect, url_for, jsonify, abort, Response, g
-from flask_limiter import Limiter
-from flask_limiter.util import get_remote_address
-from email_validator import validate_email, EmailNotValidError
-from werkzeug.security import generate_password_hash, check_password_hash
-from functools import wraps
-import sqlite3
 import logging
 import os
 import re
+import sqlite3
+import threading
+from datetime import datetime, timedelta, timezone
+from zoneinfo import ZoneInfo
+
+from email_validator import validate_email, EmailNotValidError
+from flask import Flask, render_template, request, redirect, url_for, jsonify, abort
+from flask_limiter import Limiter
+from flask_limiter.util import get_remote_address
+from flask_login import (
+    LoginManager, UserMixin, login_user, logout_user, login_required, current_user
+)
+from flask_wtf.csrf import CSRFProtect
+from werkzeug.security import generate_password_hash, check_password_hash
 
 # Set up logging
 logging.basicConfig(level=logging.INFO)
@@ -15,7 +22,85 @@ logger = logging.getLogger(__name__)
 
 app = Flask(__name__)
 DATABASE = os.environ.get('DATABASE_PATH', 'guestbook.db')
+
+_secret_key = os.environ.get('SECRET_KEY')
+if not _secret_key:
+    raise RuntimeError("SECRET_KEY environment variable must be set")
+app.secret_key = _secret_key
+
 limiter = Limiter(get_remote_address, app=app, default_limits=[])
+csrf = CSRFProtect(app)
+
+app.config.update(
+    SESSION_COOKIE_HTTPONLY=True,
+    SESSION_COOKIE_SAMESITE='Lax',
+    PERMANENT_SESSION_LIFETIME=timedelta(hours=8),
+)
+
+@app.after_request
+def set_security_headers(response):
+    response.headers['X-Content-Type-Options'] = 'nosniff'
+    response.headers['X-Frame-Options'] = 'SAMEORIGIN'
+    response.headers['Referrer-Policy'] = 'strict-origin-when-cross-origin'
+    if request.path.startswith('/admin'):
+        response.headers['Cache-Control'] = 'no-store'
+    return response
+
+_DISPLAY_TZ = ZoneInfo('America/Denver')
+
+@app.template_filter('localtime')
+def localtime_filter(value):
+    if not value:
+        return value
+    try:
+        dt = datetime.strptime(str(value), '%Y-%m-%d %H:%M:%S')
+        dt = dt.replace(tzinfo=timezone.utc)
+        return dt.astimezone(_DISPLAY_TZ).strftime('%Y-%m-%d %H:%M')
+    except ValueError:
+        return value
+
+login_manager = LoginManager(app)
+login_manager.login_view = 'admin_login'
+
+# ---------------------------------------------------------------------------
+# User model
+# ---------------------------------------------------------------------------
+
+class User(UserMixin):
+    """Lightweight user object stored in the session."""
+    def __init__(self, user_id, username, role):
+        # user_id format: 's:<username>' for superadmin, 'u:<db_id>' for DB users
+        self.id = user_id
+        self.username = username
+        self.role = role
+
+
+@login_manager.user_loader
+def load_user(user_id):
+    if user_id.startswith('s:'):
+        username = user_id[2:]
+        admin_user = os.environ.get('ADMIN_USER')
+        if admin_user and username == admin_user:
+            return User(user_id, username, 'superadmin')
+        return None
+    if user_id.startswith('u:'):
+        db_id = user_id[2:]
+        try:
+            conn = sqlite3.connect(DATABASE)
+            c = conn.cursor()
+            row = c.execute(
+                'SELECT id, username, role FROM users WHERE id = ?', (db_id,)
+            ).fetchone()
+            conn.close()
+            if row:
+                return User(f'u:{row[0]}', row[1], row[2])
+        except sqlite3.Error as e:
+            logger.error("Database error in user_loader: %s", e)
+    return None
+
+# ---------------------------------------------------------------------------
+# Profanity filter
+# ---------------------------------------------------------------------------
 
 def load_banned_words():
     banned_words = set()
@@ -38,6 +123,14 @@ def load_banned_words():
 
 BANNED_WORDS = load_banned_words()
 
+FIELD_MAX = {
+    'first_name': 100,
+    'last_name':  100,
+    'email':      254,
+    'location':   100,
+    'comment':   2000,
+}
+
 def contains_banned_words(text):
     lower = text.lower()
     # Whole-word check (punctuation-stripped) — catches exact matches
@@ -53,6 +146,10 @@ def contains_banned_words(text):
             return True
     return False
 
+# ---------------------------------------------------------------------------
+# Database migrations
+# ---------------------------------------------------------------------------
+
 # Each entry is a list of SQL statements for that schema version.
 # To add a column or index in the future, append a new list — never modify existing entries.
 MIGRATIONS = [
@@ -121,6 +218,26 @@ def is_valid_email(email):
 with app.app_context():
     migrate_db()
 
+# ---------------------------------------------------------------------------
+# Webhook
+# ---------------------------------------------------------------------------
+
+def _fire_webhook(payload):
+    url = os.environ.get("WEBHOOK_URL", "")
+    if not url:
+        return
+    try:
+        import urllib.request, json as _json
+        data = _json.dumps(payload).encode()
+        req = urllib.request.Request(url, data=data, headers={"Content-Type": "application/json"})
+        urllib.request.urlopen(req, timeout=5)
+    except Exception as e:
+        logger.warning("Webhook delivery failed: %s", e)
+
+# ---------------------------------------------------------------------------
+# Public routes
+# ---------------------------------------------------------------------------
+
 @app.route('/', methods=['GET', 'POST'])
 @limiter.limit("5 per minute", methods=["POST"])
 def index():
@@ -137,6 +254,14 @@ def index():
         if not (first_name and last_name and location):
             error = "First name, last name, and location are required."
             logger.warning("Missing required fields.")
+        elif (len(first_name) > FIELD_MAX['first_name'] or
+              len(last_name)  > FIELD_MAX['last_name']  or
+              len(location)   > FIELD_MAX['location']):
+            error = "A required field exceeds the maximum allowed length."
+        elif email and len(email) > FIELD_MAX['email']:
+            error = "Email address is too long."
+        elif comment and len(comment) > FIELD_MAX['comment']:
+            error = f"Comment is too long (max {FIELD_MAX['comment']:,} characters)."
         elif email and not is_valid_email(email):
             error = "Invalid email address."
             logger.warning("Invalid email: %s", email)
@@ -174,6 +299,13 @@ def index():
                                    error="Unable to save your entry. Please try again.",
                                    guests=[])
         logger.info("Added guest: %s %s from %s", first_name, last_name, location)
+        threading.Thread(target=_fire_webhook, args=({
+            "first_name": first_name,
+            "last_name": last_name,
+            "email": email,
+            "location": location,
+            "newsletter_opt_in": newsletter_opt_in,
+        },), daemon=True).start()
         return redirect(url_for('index'))
 
     try:
@@ -188,65 +320,63 @@ def index():
     logger.info("Rendering index with %d guests.", len(guests))
     return render_template('index.html', error=error, guests=guests)
 
-def _authenticate():
+# ---------------------------------------------------------------------------
-    """Returns (username, role) for the current request, or None if unauthenticated.
+# Admin auth routes
-    Role is 'superadmin', 'admin', or 'viewer'."""
+# ---------------------------------------------------------------------------
-    auth = request.authorization
+
-    if not auth:
+def _admin_configured():
-        return None
+    return bool(os.environ.get('ADMIN_USER') and os.environ.get('ADMIN_PASSWORD'))
+
+@app.route('/admin/login', methods=['GET', 'POST'])
+@limiter.limit("10 per minute", methods=["POST"])
+def admin_login():
+    if not _admin_configured():
+        abort(503)
+    if current_user.is_authenticated:
+        return redirect(url_for('admin'))
+    error = None
+    if request.method == 'POST':
+        username = request.form.get('username', '').strip()
+        password = request.form.get('password', '').strip()
         admin_user = os.environ.get('ADMIN_USER')
         admin_password = os.environ.get('ADMIN_PASSWORD')
-    if admin_user and auth.username == admin_user and auth.password == admin_password:
+        # Check superadmin first
-        return (auth.username, 'superadmin')
+        if admin_user and username == admin_user and password == admin_password:
+            login_user(User(f's:{username}', username, 'superadmin'))
+            logger.info("Superadmin '%s' logged in.", username)
+            return redirect(request.args.get('next') or url_for('admin'))
+        # Check DB users
         try:
             conn = sqlite3.connect(DATABASE)
             c = conn.cursor()
             row = c.execute(
-            'SELECT password_hash, role FROM users WHERE username = ?', (auth.username,)
+                'SELECT id, password_hash, role FROM users WHERE username = ?', (username,)
             ).fetchone()
             conn.close()
-        if row and check_password_hash(row[0], auth.password):
+            if row and check_password_hash(row[1], password):
-            return (auth.username, row[1])
+                login_user(User(f'u:{row[0]}', username, row[2]))
+                logger.info("User '%s' (role=%s) logged in.", username, row[2])
+                return redirect(request.args.get('next') or url_for('admin'))
         except sqlite3.Error as e:
-        logger.error("Database error during authentication: %s", e)
+            logger.error("Database error during login: %s", e)
-    return None
+        error = 'Invalid username or password.'
+        logger.warning("Failed login attempt for username '%s'.", username)
+    return render_template('admin_login.html', error=error)
 
-def _unauthorized():
+@app.route('/admin/logout')
-    return Response('Authentication required.', 401, {'WWW-Authenticate': 'Basic realm="Admin"'})
+def admin_logout():
+    logout_user()
+    return redirect(url_for('admin_login'))
 
-def require_any_auth(f):
+# ---------------------------------------------------------------------------
-    """Allows superadmin, admin, and viewer roles."""
+# Admin routes
-    @wraps(f)
+# ---------------------------------------------------------------------------
-    def decorated(*args, **kwargs):
-        if not os.environ.get('ADMIN_USER') or not os.environ.get('ADMIN_PASSWORD'):
-            logger.error("ADMIN_USER and ADMIN_PASSWORD must be set to enable the admin interface.")
-            abort(503)
-        user = _authenticate()
-        if user is None:
-            return _unauthorized()
-        g.current_user, g.current_role = user
-        return f(*args, **kwargs)
-    return decorated
-
-def require_superadmin(f):
-    """Allows only the bootstrap superadmin."""
-    @wraps(f)
-    def decorated(*args, **kwargs):
-        admin_user = os.environ.get('ADMIN_USER')
-        admin_password = os.environ.get('ADMIN_PASSWORD')
-        if not admin_user or not admin_password:
-            abort(503)
-        auth = request.authorization
-        if not auth or auth.username != admin_user or auth.password != admin_password:
-            return _unauthorized()
-        g.current_user = auth.username
-        g.current_role = 'superadmin'
-        return f(*args, **kwargs)
-    return decorated
 
 @app.route('/admin')
-@require_any_auth
+@login_required
 def admin():
+    if not _admin_configured():
+        abort(503)
     page = request.args.get('page', 1, type=int)
     per_page = 25
     offset = (page - 1) * per_page
@@ -266,12 +396,14 @@ def admin():
         total = 0
     total_pages = (total + per_page - 1) // per_page
     return render_template('admin.html', guests=guests, page=page, total_pages=total_pages,
-                           total=total, current_role=g.current_role)
+                           total=total)
 
 @app.route('/admin/delete/<int:entry_id>', methods=['POST'])
-@require_any_auth
+@login_required
 def admin_delete(entry_id):
-    if g.current_role == 'viewer':
+    if not _admin_configured():
+        abort(503)
+    if current_user.role == 'viewer':
         abort(403)
     try:
         conn = sqlite3.connect(DATABASE)
@@ -285,8 +417,12 @@ def admin_delete(entry_id):
     return redirect(url_for('admin', page=request.args.get('page', 1)))
 
 @app.route('/admin/users')
-@require_superadmin
+@login_required
 def admin_users():
+    if not _admin_configured():
+        abort(503)
+    if current_user.role != 'superadmin':
+        abort(403)
     try:
         conn = sqlite3.connect(DATABASE)
         c = conn.cursor()
@@ -298,8 +434,12 @@ def admin_users():
     return render_template('admin_users.html', users=users)
 
 @app.route('/admin/users/add', methods=['POST'])
-@require_superadmin
+@login_required
 def admin_users_add():
+    if not _admin_configured():
+        abort(503)
+    if current_user.role != 'superadmin':
+        abort(403)
     username = request.form.get('username', '').strip()
     password = request.form.get('password', '').strip()
     role = request.form.get('role', '').strip()
@@ -322,8 +462,12 @@ def admin_users_add():
     return redirect(url_for('admin_users'))
 
 @app.route('/admin/users/delete/<int:user_id>', methods=['POST'])
-@require_superadmin
+@login_required
 def admin_users_delete(user_id):
+    if not _admin_configured():
+        abort(503)
+    if current_user.role != 'superadmin':
+        abort(403)
     try:
         conn = sqlite3.connect(DATABASE)
         c = conn.cursor()
@@ -335,7 +479,13 @@ def admin_users_delete(user_id):
         logger.error("Database error deleting user %d: %s", user_id, e)
     return redirect(url_for('admin_users'))
 
+# ---------------------------------------------------------------------------
+# API
+# ---------------------------------------------------------------------------
+
 @app.route('/api/guests', methods=['GET'])
+@limiter.limit("100 per hour")
+@csrf.exempt
 def api_guests():
     api_key = request.headers.get('X-API-Key')
     if api_key != os.environ.get("API_KEY"):

entrypoint.sh

@@ -1,4 +1,6 @@
 #!/bin/sh
+set -e
+
 # Fix ownership of the data directory so appuser can write the database.
 # This runs as root (no USER directive in Dockerfile) and is safe because
 # we immediately drop privileges via gosu before starting the app.
@@ -9,4 +11,8 @@ chown -R appuser:appuser "$DATA_DIR"
 envsubst < /app/templates/index.html.template > /app/templates/index.html
 
 # Drop to appuser and start Gunicorn
-exec gosu appuser gunicorn --bind 0.0.0.0:8000 app:app --workers ${GUNICORN_WORKERS:-3}
+exec gosu appuser gunicorn \
+    --bind 0.0.0.0:8000 \
+    --workers ${GUNICORN_WORKERS:-3} \
+    --timeout 30 \
+    app:app

example.env

@@ -12,3 +12,6 @@ SITE_TITLE="The Montana Dinosaur Center Visitor Log"
 LOGO_URL="/static/images/logo.png"
 ADMIN_USER=admin
 ADMIN_PASSWORD=changeme
+SECRET_KEY=change-this-to-a-random-secret-key
+# Optional: POST new signups as JSON to this URL (e.g. an n8n Webhook node)
+WEBHOOK_URL=

requirements.txt

@@ -1,5 +1,8 @@
 Flask>=3.1.3
+Flask-WTF>=1.2
 Werkzeug>=3.0.6
 Flask-Limiter>=3.0
+Flask-Login>=0.6
 email-validator>=2.0
 gunicorn
+tzdata

templates/admin.html

@@ -11,10 +11,11 @@
         <div class="d-flex justify-content-between align-items-center mb-4">
             <h1 class="h3 mb-0">Guestbook Admin</h1>
             <div class="d-flex align-items-center gap-3">
-                <span class="text-muted">{{ total }} total entries</span>
+                <span class="text-muted">{{ current_user.username }} &middot; {{ total }} entries</span>
-                {% if current_role == 'superadmin' %}
+                {% if current_user.role == 'superadmin' %}
                 <a href="{{ url_for('admin_users') }}" class="btn btn-outline-secondary btn-sm">Manage Users</a>
                 {% endif %}
+                <a href="{{ url_for('admin_logout') }}" class="btn btn-outline-danger btn-sm">Logout</a>
             </div>
         </div>
 
@@ -41,11 +42,12 @@
                         <td>{{ g[4] }}</td>
                         <td>{{ g[5] or '—' }}</td>
                         <td>{{ 'Yes' if g[6] else 'No' }}</td>
-                        <td class="text-nowrap">{{ g[7] }}</td>
+                        <td class="text-nowrap">{{ g[7] | localtime }}</td>
                         <td>
-                            {% if current_role != 'viewer' %}
+                            {% if current_user.role != 'viewer' %}
                             <form method="POST" action="{{ url_for('admin_delete', entry_id=g[0]) }}?page={{ page }}"
                                   onsubmit="return confirm('Delete entry for {{ g[1] }} {{ g[2] }}?')">
+                                <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
                                 <button type="submit" class="btn btn-danger btn-sm">Delete</button>
                             </form>
                             {% endif %}

templates/admin_login.html

@@ -0,0 +1,35 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Guestbook Admin — Login</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" />
+</head>
+<body class="bg-light">
+    <div class="container py-5" style="max-width: 400px;">
+        <h1 class="h4 mb-4 text-center">Admin Login</h1>
+        <div class="card">
+            <div class="card-body">
+                {% if error %}
+                <div class="alert alert-danger py-2">{{ error }}</div>
+                {% endif %}
+                <form method="POST" action="{{ url_for('admin_login', next=request.args.get('next', '')) }}">
+                    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
+                    <div class="mb-3">
+                        <label for="username" class="form-label">Username</label>
+                        <input type="text" id="username" name="username" class="form-control"
+                               autocomplete="username" required autofocus />
+                    </div>
+                    <div class="mb-3">
+                        <label for="password" class="form-label">Password</label>
+                        <input type="password" id="password" name="password" class="form-control"
+                               autocomplete="current-password" required />
+                    </div>
+                    <button type="submit" class="btn btn-primary w-100">Log In</button>
+                </form>
+            </div>
+        </div>
+    </div>
+</body>
+</html>

templates/admin_users.html

@@ -10,13 +10,17 @@
     <div class="container py-4" style="max-width: 700px;">
         <div class="d-flex justify-content-between align-items-center mb-4">
             <h1 class="h3 mb-0">User Management</h1>
+            <div class="d-flex gap-2">
                 <a href="{{ url_for('admin') }}" class="btn btn-outline-secondary btn-sm">Back to Entries</a>
+                <a href="{{ url_for('admin_logout') }}" class="btn btn-outline-danger btn-sm">Logout</a>
+            </div>
         </div>
 
         <div class="card mb-4">
             <div class="card-header">Add User</div>
             <div class="card-body">
                 <form method="POST" action="{{ url_for('admin_users_add') }}">
+                    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
                     <div class="row g-2">
                         <div class="col-sm-4">
                             <input type="text" name="username" class="form-control" placeholder="Username" required />
@@ -54,6 +58,7 @@
                     <td>
                         <form method="POST" action="{{ url_for('admin_users_delete', user_id=u[0]) }}"
                               onsubmit="return confirm('Remove user {{ u[1] }}?')">
+                            <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
                             <button type="submit" class="btn btn-danger btn-sm">Remove</button>
                         </form>
                     </td>

templates/index.html.template

@@ -8,7 +8,18 @@
 
     <!-- Bootstrap CSS -->
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" />
+    <!-- Fonts -->
+    <link href="https://fonts.googleapis.com/css2?family=Vollkorn:wght@700&family=Open+Sans&display=swap" rel="stylesheet" />
     <style>
+        body {
+            font-family: 'Open Sans', sans-serif;
+        }
+
+        h1, h2, h3, h4, h5, h6 {
+            font-family: 'Vollkorn', serif;
+            font-weight: 700;
+        }
+
         /* Scrolling marquee styles */
         .scrolling-wrapper {
             overflow: hidden;
@@ -59,19 +70,20 @@
         {% endif %}
 
         <form method="post" action="/" class="mb-4">
+            <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
             <div class="mb-3">
                 <label for="first_name" class="form-label">First Name(s):</label>
-                <input type="text" class="form-control" id="first_name" name="first_name" required />
+                <input type="text" class="form-control" id="first_name" name="first_name" maxlength="100" required />
             </div>
             <div class="mb-3">
                 <label for="last_name" class="form-label">Last Name:</label>
-                <input type="text" class="form-control" id="last_name" name="last_name" required />
+                <input type="text" class="form-control" id="last_name" name="last_name" maxlength="100" required />
             </div>
 
             <!-- Email + Newsletter Block (fully fixed) -->
             <div class="mb-3">
                 <label for="email" class="form-label">Email (Optional):</label>
-                <input type="email" class="form-control" id="email" name="email" />
+                <input type="email" class="form-control" id="email" name="email" maxlength="254" />
 
                 <div class="form-check mt-2">
                     <input class="form-check-input" type="checkbox" name="newsletter_opt_in" id="newsletter_opt_in"
@@ -84,13 +96,13 @@
 
             <div class="mb-3">
                 <label for="location" class="form-label">Location:</label>
-                <input type="text" class="form-control" id="location" name="location" required />
+                <input type="text" class="form-control" id="location" name="location" maxlength="100" required />
             </div>
 
             <!-- Comment field hidden by default -->
             <div class="mb-3" id="comment-field" style="display: none;">
                 <label for="comment" class="form-label">Comment (Optional):</label>
-                <textarea class="form-control" id="comment" name="comment" rows="3"></textarea>
+                <textarea class="form-control" id="comment" name="comment" rows="3" maxlength="2000"></textarea>
             </div>
 
             <button type="submit" class="btn btn-primary">Submit</button>