feat: Simplify login page - Remove marketing content, show only logo and form

- Replace app.py with simplified version (app_simple_login.py)
- Remove carousel, tabs, videos, gallery
- Show only: Logo + Email + Password + Sign In button
- Backup saved as: app_backup_20260712_150929.py
- After login, full interface remains the same

app_backup_20260712_150929.py

@@ -0,0 +1,275 @@
+# AIdeaText v5 - Simple Login Page
+# app_simple_login.py - Página simplificada con solo logo y login
+
+import logging
+import streamlit as st
+import sys
+import os
+from dotenv import load_dotenv
+
+# Configuración básica
+load_dotenv()
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+# Configuración de la página
+st.set_page_config(
+    page_title="AIdeaText - Login",
+    layout="centered",
+    initial_sidebar_state="collapsed"
+)
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+# Importaciones locales necesarias
+from session_state import initialize_session_state
+from modules.utils.spacy_utils import load_spacy_models
+from modules.database.database_init import initialize_database_connections
+from modules.database.sql_db import get_user, record_login
+from modules.ui.ui import user_page  # Para después del login
+from modules.admin.admin_ui import admin_page  # Para administradores
+from translations import get_translations
+
+@st.cache_resource(show_spinner=False)
+def initialize_nlp_models():
+    logger.info("Cargando modelos de spaCy")
+    models = load_spacy_models()
+    logger.info("Modelos de spaCy cargados exitosamente")
+    return models
+
+def authenticate_user(username, password):
+    """Autentica un usuario contra la base de datos"""
+    try:
+        user = get_user(username)
+        if user and user['password'] == password:
+            # Registrar login
+            record_login(username)
+            return True, user.get('role', 'Student')
+        return False, None
+    except Exception as e:
+        logger.error(f"Error en autenticación: {str(e)}")
+        return False, None
+
+def simple_login_page():
+    """Página simplificada con solo logo y login"""
+
+    # CSS personalizado para centrado y diseño limpio
+    st.markdown("""
+    <style>
+        /* Ocultar elementos default de Streamlit */
+        #MainMenu {visibility: hidden;}
+        footer {visibility: hidden;}
+        header {visibility: hidden;}
+
+        /* Contenedor principal */
+        .main {
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            min-height: 100vh;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+        }
+
+        /* Card de login */
+        .login-container {
+            background: white;
+            padding: 40px;
+            border-radius: 20px;
+            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
+            max-width: 400px;
+            width: 100%;
+            margin: 0 auto;
+        }
+
+        /* Logo centrado */
+        .logo-container {
+            text-align: center;
+            margin-bottom: 30px;
+        }
+
+        .logo-container img {
+            max-width: 200px;
+            height: auto;
+        }
+
+        /* Título */
+        .login-title {
+            text-align: center;
+            color: #1E3A8A;
+            font-size: 1.8em;
+            font-weight: 700;
+            margin-bottom: 30px;
+        }
+
+        /* Inputs de Streamlit */
+        .stTextInput > div > div > input {
+            border-radius: 10px;
+            border: 2px solid #e5e7eb;
+            padding: 12px;
+            font-size: 16px;
+        }
+
+        .stTextInput > div > div > input:focus {
+            border-color: #667eea;
+            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+        }
+
+        /* Botón de login */
+        .stButton > button {
+            width: 100%;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            color: white;
+            border: none;
+            border-radius: 10px;
+            padding: 12px;
+            font-size: 16px;
+            font-weight: 600;
+            cursor: pointer;
+            transition: transform 0.2s;
+        }
+
+        .stButton > button:hover {
+            transform: translateY(-2px);
+            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
+        }
+
+        /* Footer */
+        .footer-text {
+            text-align: center;
+            margin-top: 20px;
+            color: #6b7280;
+            font-size: 14px;
+        }
+
+        .footer-text a {
+            color: #667eea;
+            text-decoration: none;
+        }
+
+        .footer-text a:hover {
+            text-decoration: underline;
+        }
+    </style>
+    """, unsafe_allow_html=True)
+
+    # Contenedor de login
+    col1, col2, col3 = st.columns([1, 2, 1])
+
+    with col2:
+        # Logo
+        st.markdown("""
+        <div class="logo-container">
+            <img src="https://huggingface.co/spaces/AIdeaText/v5Prod/resolve/main/assets/img/Logo_300x300.png"
+                 alt="AIdeaText Logo">
+        </div>
+        """, unsafe_allow_html=True)
+
+        # Título
+        st.markdown('<h1 class="login-title">Welcome to AIdeaText</h1>', unsafe_allow_html=True)
+
+        # Formulario de login
+        with st.form("login_form", clear_on_submit=False):
+            username = st.text_input(
+                "Email",
+                placeholder="your.email@university.edu",
+                key="login_email"
+            )
+            password = st.text_input(
+                "Password",
+                type="password",
+                placeholder="Enter your password",
+                key="login_password"
+            )
+
+            st.write("")  # Espacio
+            submit_button = st.form_submit_button("🔐 Sign In")
+
+        # Procesar login
+        if submit_button:
+            if not username or not password:
+                st.error("⚠️ Please enter both email and password")
+            else:
+                with st.spinner("Authenticating..."):
+                    success, role = authenticate_user(username, password)
+
+                    if success:
+                        st.session_state.logged_in = True
+                        st.session_state.username = username
+                        st.session_state.role = role
+
+                        if role == 'Administrador':
+                            st.session_state.page = 'Admin'
+                        else:
+                            st.session_state.page = 'user'
+
+                        logger.info(f"Usuario autenticado: {username}, Rol: {role}")
+                        st.success("✅ Login successful!")
+                        st.rerun()
+                    else:
+                        st.error("❌ Invalid email or password")
+
+        # Footer
+        st.markdown("""
+        <div class="footer-text">
+            Need access? <a href="https://aideatext.ai/#contact" target="_blank">Contact us</a><br>
+            <small>© 2026 AIdeaText. All rights reserved.</small>
+        </div>
+        """, unsafe_allow_html=True)
+
+def app_main():
+    """Función principal de la aplicación"""
+    try:
+        logger.info("Iniciando aplicación AIdeaText")
+
+        # Inicializar el estado de la sesión
+        if 'initialized' not in st.session_state:
+            initialize_session_state()
+            st.session_state.initialized = True
+
+        # Inicializar conexiones a bases de datos
+        if 'db_initialized' not in st.session_state:
+            st.session_state.db_initialized = initialize_database_connections()
+
+        # Cargar modelos NLP
+        if 'nlp_models' not in st.session_state:
+            logger.info("Inicializando modelos NLP")
+            st.session_state.nlp_models = initialize_nlp_models()
+            logger.info("Modelos NLP inicializados")
+
+        # Configurar página inicial
+        if 'page' not in st.session_state:
+            st.session_state.page = 'login'
+
+        logger.info(f"Página actual: {st.session_state.page}")
+        logger.info(f"Logged in: {st.session_state.get('logged_in', False)}")
+
+        # Routing
+        if not st.session_state.get('logged_in', False):
+            # Mostrar página de login simple
+            simple_login_page()
+        elif st.session_state.page == 'user':
+            # Usuario autenticado - mostrar interfaz completa
+            if st.session_state.role == 'Administrador':
+                st.session_state.page = 'Admin'
+                st.rerun()
+            else:
+                lang_code = st.session_state.get('lang_code', 'en')
+                t = get_translations(lang_code)
+                user_page(lang_code, t)
+        elif st.session_state.page == 'Admin':
+            # Página de administrador
+            admin_page()
+        else:
+            logger.error(f"Página no reconocida: {st.session_state.page}")
+            st.session_state.page = 'login'
+            st.rerun()
+
+    except Exception as e:
+        logger.error(f"Error en app_main: {str(e)}", exc_info=True)
+        st.error("Se ha producido un error. Por favor, inténtelo de nuevo.")
+        if st.button("Reiniciar"):
+            st.session_state.clear()
+            st.rerun()
+
+if __name__ == "__main__":
+    app_main()