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<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LiftTrack - Suivi Musculation Multi-Utilisateurs</title>
    <!-- Ajout de la librairie pour les confettis -->
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/confetti.browser.min.js"></script>
    <style>
        /* --- Styles CSS (avec ajouts/modifications) --- */
        :root {
            --bg-dark: #121212;
            --bg-card: #1e1e1e;
            --text-light: #e0e0e0;
            --accent: #4CAF50;
            --accent-dark: #3a8a3d;
            --danger: #f44336;
            --superset-border: #4a90e2; /* Couleur pour indiquer superset */
        }
        * { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
        body { background-color: var(--bg-dark); color: var(--text-light); min-height: 100vh; padding-bottom: 80px; }
        .container { width: 100%; max-width: 800px; margin: 0 auto; padding: 1rem; }
        header { padding: 1rem 0; text-align: center; border-bottom: 1px solid #333; margin-bottom: 1rem; }
        h1, h2, h3 { color: var(--accent); }
        .btn { background-color: var(--accent); color: white; border: none; padding: 0.6rem 1.2rem; border-radius: 4px; cursor: pointer; font-weight: bold; transition: background-color 0.2s; }
        .btn:hover { background-color: var(--accent-dark); }
        .btn:disabled { background-color: #555; cursor: not-allowed; }
        .btn-outline { background-color: transparent; color: var(--accent); border: 1px solid var(--accent); }
        .btn-outline:disabled { color: #555; border-color: #555; }
        .btn-danger { background-color: var(--danger); }
        input, select, textarea { width: 100%; padding: 0.6rem; margin-bottom: 1rem; background-color: #2a2a2a; border: 1px solid #444; border-radius: 4px; color: var(--text-light); }
        input[type="checkbox"] { width: auto; margin-right: 0.5rem; vertical-align: middle; }
        .card { background-color: var(--bg-card); border-radius: 8px; padding: 1rem; margin-bottom: 1rem; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
        .form-group { margin-bottom: 1rem; }
        .form-row { display: flex; gap: 0.5rem; margin-bottom: 0.5rem; flex-wrap: wrap; }
        .form-row > * { flex: 1; margin-bottom: 0; min-width: 100px; }
        label { display: block; margin-bottom: 0.3rem; color: #bbb; font-size: 0.9rem; }
        .exercise {
            border-left: 3px solid var(--accent);
            padding-left: 1rem;
            margin-bottom: 1.5rem;
            display: none; /* Caché par défaut, montré par JS */
        }
        .exercise.active-exercise {
            display: block; /* Afficher l'exercice actif */
             animation: fadeIn 0.3s ease-in-out;
        }
        /* Style pour exercice débutant un superset (dans le formulaire) */
        .exercise.is-superset-start {
            border-left-color: var(--superset-border);
        }
        .exercise-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; gap: 0.5rem;}
        .exercise-header input {margin-bottom: 0;}
        .series-container { margin-left: 0.5rem; margin-top: 0.5rem; }
        .series { background-color: #252525; padding: 0.7rem; border-radius: 4px; margin-bottom: 0.5rem; }
        .nav-bottom { position: fixed; bottom: 0; left: 0; width: 100%; background-color: #1a1a1a; display: flex; justify-content: space-around; padding: 0.7rem 0; box-shadow: 0 -2px 10px rgba(0,0,0,0.3); z-index: 10; }
        .nav-item { text-align: center; color: #888; text-decoration: none; font-size: 0.85rem; transition: color 0.2s; padding: 0 0.5rem;}
        .nav-item.active { color: var(--accent); }
        .nav-icon { font-size: 1.4rem; margin-bottom: 0.2rem; }
        .workout-card { border-left: 3px solid var(--accent); cursor: pointer; transition: transform 0.2s; }
        .workout-card:hover { transform: translateX(5px); }
        .workout-header { display: flex; justify-content: space-between; align-items: flex-start; }
        .stat-card { text-align: center; padding: 1rem; }
        .stat-value { font-size: 1.8rem; color: var(--accent); font-weight: bold; }
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 1rem; }
        .hidden { display: none; }
        #login-page { display: block; }
        #main-app-content { display: none; }
        #app-container > div:not(.active) { display: none !important; }
        .flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem;}
        .badge { background-color: var(--accent); color: white; padding: 0.2rem 0.5rem; border-radius: 10px; font-size: 0.8rem; white-space: nowrap; }
        .badge-superset { background-color: var(--superset-border); }
        .spinner { border: 4px solid rgba(0, 0, 0, 0.1); width: 36px; height: 36px; border-radius: 50%; border-left-color: var(--accent); animation: spin 1s linear infinite; margin: 2rem auto; display: none; }
        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
        .exercise-summary { margin: 0.3rem 0; padding: 0.3rem 0; border-bottom: 1px solid #333; font-size: 0.9rem;}
        .exercise-summary:last-child { border-bottom: none; }
        .satisfaction { display: flex; align-items: center; justify-content: center; flex-direction: column; margin-top: 1rem; }
        .satisfaction-value { font-size: 2rem; color: var(--accent); margin-top: 0.5rem; }
        .exercise-navigation { display: flex; justify-content: space-between; margin-top: 1rem; margin-bottom: 1rem; }
        .detail-exercise-card.is-superset-start {
             border-left: 3px solid var(--superset-border);
             margin-bottom: 0.2rem; /* Réduire l'espace avant le suivant */
        }
         .detail-exercise-card.is-superset-continuation {
            border-left: 3px solid var(--superset-border);
             padding-top: 0.5rem;
             margin-top: -0.8rem; /* Rapprocher visuellement */
             border-top-left-radius: 0; /* Pour lier visuellement */
              border-bottom-left-radius: 8px;
        }


        /* Animation d'apparition/zoom pour nouvelle séance */
         @keyframes fadeInZoom {
            from { opacity: 0; transform: scale(0.95); }
            to { opacity: 1; transform: scale(1); }
        }
         #new-workout-page.active {
             animation: fadeInZoom 0.3s ease-out;
         }

         /* Styles page de connexion & user info */
        #login-page .card { max-width: 400px; margin: 2rem auto; }
        #login-page h2 { text-align: center; margin-bottom: 1.5rem; }
        #login-error { color: var(--danger); text-align: center; margin-top: 1rem; display: none; }
        .user-info { text-align: right; margin-bottom: 1rem; font-size: 0.9rem; color: #bbb;}
        .user-info strong { color: var(--text-light); }
        .user-info button { margin-left: 0.5rem; padding: 0.2rem 0.5rem; font-size: 0.8rem; }

         @media (max-width: 600px) {
             .form-row { flex-direction: column; gap: 0; }
             .container { padding: 0.5rem; }
             h1 { font-size: 1.5rem; }
             .flex-between { flex-direction: column; align-items: stretch; }
             .flex-between > div { width: 100%; display: flex; justify-content: flex-end; margin-top: 0.5rem;}
             .user-info { text-align: center; margin-bottom: 0.5rem;}
             .user-info button { display: block; margin: 0.5rem auto 0;}
             .exercise-navigation button { padding: 0.5rem; font-size: 0.9rem;} /* Ajuster boutons nav exercice */
         }
        /* Animation fade in standard */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
    </style>
</head>
<body>
    <div class="container">
        <header>
            <h1>LiftTrack</h1>
            <p>Suivi de vos séances de musculation</p>
        </header>

        <!-- Écran de Connexion -->
        <div id="login-page">
             <!-- Contenu page connexion -->
             <div class="card">
                <h2>Accès Utilisateur</h2>
                <div class="form-group">
                    <label for="username">Nom d'utilisateur</label>
                    <input type="text" id="username" placeholder="Entrez votre nom ou pseudo">
                </div>
                <button id="login-btn" class="btn" style="width: 100%;">Accéder / Créer</button>
                <p id="login-error">Nom d'utilisateur invalide.</p>
                <p style="font-size: 0.8rem; color: #888; text-align: center; margin-top: 1rem;">
                    Entrez un nom pour accéder à vos données ou créer un nouvel espace si le nom n'existe pas.
                </p>
            </div>
        </div>

        <!-- Contenu Principal de l'Application -->
        <div id="main-app-content">
            <div class="user-info">
                Connecté: <strong id="current-user-display"></strong>
                <button id="logout-btn" class="btn btn-outline">Changer</button>
            </div>

            <div id="app-container">
                <!-- Page Accueil / Liste Séances -->
                <div id="home-page" class="active">
                     <div class="flex-between">
                        <h2>Mes séances</h2>
                        <button id="new-workout-btn" class="btn">Nouvelle séance</button>
                    </div>
                    <div id="workouts-list" class="workout-list" style="margin-top: 1rem;">
                        <div class="spinner hidden"></div>
                        <p id="empty-workout-message" class="hidden" style="text-align: center; margin-top: 2rem;">
                            Aucune séance enregistrée.
                        </p>
                    </div>
                </div>

                <!-- Page Nouvelle Séance -->
                <div id="new-workout-page">
                     <div class="flex-between">
                        <h2>Nouvelle séance <span id="current-exercise-indicator" style="font-size: 0.9rem; color: #ccc;"></span></h2>
                        <div>
                             <button id="cancel-new-workout-btn" class="btn btn-outline" style="margin-right: 0.5rem;">Annuler</button>
                             <button id="save-workout-btn" class="btn">Enregistrer Séance</button>
                        </div>
                    </div>
                    <!-- Infos Séance -->
                    <div class="card">
                         <div class="form-group"> <label for="workout-name">Nom de la séance</label> <input type="text" id="workout-name" placeholder="Ex: Push, Legs, Full Body..."> </div>
                         <div class="form-row"> <div class="form-group"> <label for="workout-date">Date</label> <input type="date" id="workout-date"> </div> <div class="form-group"> <label for="workout-duration">Durée (min)</label> <input type="number" id="workout-duration" min="1" placeholder="60"> </div> </div>
                    </div>

                    <h3 style="margin: 1rem 0;">Exercices</h3>
                    <!-- Navigation entre exercices -->
                    <div class="exercise-navigation card">
                        <button id="prev-exercise-btn" class="btn btn-outline">< Précédent</button>
                        <span style="align-self: center; color: #ccc;">Exercice Actif</span>
                        <button id="next-exercise-btn" class="btn btn-outline">Suivant ></button>
                    </div>
                    <!-- Conteneur pour les exercices (un seul visible à la fois) -->
                    <div id="exercises-container">
                        <!-- Exercices ajoutés dynamiquement ici -->
                    </div>
                    <button id="add-exercise-btn" class="btn btn-outline" style="width: 100%; margin-top: 1rem;">+ Ajouter un Nouvel Exercice</button>

                     <!-- Satisfaction -->
                    <div class="card" style="margin-top: 2rem;">
                        <div class="form-group"> <label for="satisfaction">Niveau de satisfaction (1-100%)</label> <input type="range" id="satisfaction" min="1" max="100" value="75"> <div class="satisfaction"> <span>Satisfaction</span> <div class="satisfaction-value">75%</div> </div> </div>
                    </div>
                </div>

                <!-- Page Détail Séance -->
                <div id="workout-details-page">
                    <div class="flex-between"> <h2 id="detail-workout-name">Détail Séance</h2> <button id="back-to-home" class="btn btn-outline">Retour</button> </div>
                    <div class="card"> <div class="workout-details-info"> <div class="form-row"> <p><strong>Date:</strong> <span id="detail-date"></span></p> <p><strong>Durée:</strong> <span id="detail-duration"></span> min</p> </div> </div> </div>
                    <div class="stats-grid" style="margin-top: 1rem;"> <div class="card stat-card"> <div class="stat-value" id="detail-tonnage">0</div> <div>Tonnage Total (kg)</div> </div> <div class="card stat-card"> <div class="stat-value" id="detail-satisfaction">0%</div> <div>Satisfaction</div> </div> <div class="card stat-card"> <div class="stat-value" id="detail-exercises-count">0</div> <div>Exercices</div> </div> </div>
                    <h3 style="margin: 1.5rem 0 1rem;">Exercices Réalisés</h3>
                    <div id="detail-exercises-container"> <!-- Détails des exercices affichés ici --> </div>
                    <button id="delete-workout-btn" class="btn btn-danger" style="width: 100%; margin-top: 2rem;">Supprimer cette séance</button>
                </div>

                <!-- Page Statistiques -->
                <div id="stats-page">
                     <h2>Statistiques</h2>
                     <div class="stats-grid"> <div class="card stat-card"> <div class="stat-value" id="stats-workout-count">0</div> <div>Séances Totales</div> </div> <div class="card stat-card"> <div class="stat-value" id="stats-avg-tonnage">0</div> <div>Tonnage Moyen</div> </div> <div class="card stat-card"> <div class="stat-value" id="stats-avg-satisfaction">0%</div> <div>Satisfaction Moyenne</div> </div> </div>
                     <h3 style="margin: 1.5rem 0 1rem;">Tendances Récentes</h3>
                     <div class="card"> <p style="text-align: center; margin: 1rem 0;"> Les statistiques détaillées seront affichées après plusieurs séances enregistrées. </p> </div>
                </div>
            </div>

            <!-- Menu Navigation Bas -->
            <nav class="nav-bottom"> <a href="#" class="nav-item active" data-page="home-page"> <div class="nav-icon">📋</div> <div>Séances</div> </a> <a href="#" class="nav-item" data-page="stats-page"> <div class="nav-icon">📊</div> <div>Stats</div> </a> </nav>
        </div>
    </div>

    <script>
        // --- Variables d'État ---
        let workouts = [];
        let currentUser = null;
        let currentWorkoutId = null;
        let currentExerciseIndex = 0; // Index de l'exercice affiché dans le formulaire Nouvelle Séance
        let workoutExercisesForm = []; // Tableau temporaire pour les divs d'exercice dans le form

        // --- Éléments DOM ---
        const loginPage = document.getElementById('login-page');
        const mainAppContent = document.getElementById('main-app-content');
        const usernameInput = document.getElementById('username');
        const loginBtn = document.getElementById('login-btn');
        const loginError = document.getElementById('login-error');
        const currentUserDisplay = document.getElementById('current-user-display');
        const logoutBtn = document.getElementById('logout-btn');
        const spinner = document.querySelector('#workouts-list .spinner');
        const appContainer = document.getElementById('app-container');
        const navItems = document.querySelectorAll('.nav-item');
        const newWorkoutBtn = document.getElementById('new-workout-btn');
        const saveWorkoutBtn = document.getElementById('save-workout-btn');
        const cancelNewWorkoutBtn = document.getElementById('cancel-new-workout-btn');
        const addExerciseBtn = document.getElementById('add-exercise-btn');
        const exercisesContainer = document.getElementById('exercises-container');
        const workoutsList = document.getElementById('workouts-list');
        const backToHomeBtn = document.getElementById('back-to-home');
        const deleteWorkoutBtn = document.getElementById('delete-workout-btn');
        const satisfactionRange = document.getElementById('satisfaction');
        const satisfactionValue = document.querySelector('.satisfaction-value');
        const emptyWorkoutMessage = document.getElementById('empty-workout-message');
        const workoutDateInput = document.getElementById('workout-date');
        const prevExerciseBtn = document.getElementById('prev-exercise-btn');
        const nextExerciseBtn = document.getElementById('next-exercise-btn');
        const currentExerciseIndicator = document.getElementById('current-exercise-indicator');


        // --- Initialisation ---
        document.addEventListener('DOMContentLoaded', () => {
            const rememberedUser = sessionStorage.getItem('liftTrackCurrentUser');
            if (rememberedUser) { loginUser(rememberedUser); } else { showLoginPage(); }
            initEventListeners();
        });

        // --- Authentification & Persistance (inchangées) ---
        function showLoginPage() { /* ... */ loginPage.style.display = 'block'; mainAppContent.style.display = 'none'; loginError.style.display = 'none'; usernameInput.value = ''; currentUser = null; }
        function showApp() { /* ... */ if (!currentUser) return; loginPage.style.display = 'none'; mainAppContent.style.display = 'block'; currentUserDisplay.textContent = currentUser; setTodayDate(); loadWorkouts(); showPage('home-page'); }
        function handleLogin() { /* ... */ const username = usernameInput.value.trim(); if (username && username.length > 0) { loginUser(username); } else { loginError.textContent = "Veuillez entrer un nom d'utilisateur."; loginError.style.display = 'block'; }}
        function loginUser(username) { /* ... */ currentUser = username; sessionStorage.setItem('liftTrackCurrentUser', currentUser); showApp(); }
        function handleLogout() { /* ... */ currentUser = null; sessionStorage.removeItem('liftTrackCurrentUser'); workouts = []; showLoginPage(); }
        function getStorageKey() { /* ... */ if (!currentUser) return null; const safeUsername = currentUser.replace(/[^a-zA-Z0-9_-]/g, '_'); return `liftTrackData_${safeUsername}`; }
        function loadWorkouts() { /* ... (avec spinner) */
             const storageKey = getStorageKey(); if (!storageKey) { workouts = []; return; }
             if (spinner) spinner.classList.remove('hidden'); emptyWorkoutMessage.classList.add('hidden'); workoutsList.innerHTML = '';
             setTimeout(() => { try { const savedData = localStorage.getItem(storageKey); workouts = savedData ? JSON.parse(savedData) : []; console.log(`Chargé ${workouts.length} séances pour ${currentUser}`); } catch (e) { console.error("Erreur parsing localStorage:", e); workouts = []; alert("Erreur chargement données."); } finally { if (spinner) spinner.classList.add('hidden'); renderWorkoutsList(); } }, 150);
        }
        function saveWorkouts() { /* ... (avec try/catch) */
             const storageKey = getStorageKey(); if (!storageKey) { console.error("Sauvegarde impossible: non connecté."); return; } try { localStorage.setItem(storageKey, JSON.stringify(workouts)); console.log(`Sauvegardé ${workouts.length} séances pour ${currentUser}`); } catch (e) { console.error("Erreur sauvegarde localStorage:", e); alert("Erreur sauvegarde données."); }
        }

        // --- Écouteurs d'Événements ---
        function initEventListeners() {
            loginBtn.addEventListener('click', handleLogin);
            logoutBtn.addEventListener('click', handleLogout);
            usernameInput.addEventListener('keypress', (e) => { if (e.key === 'Enter') { e.preventDefault(); handleLogin(); } });

            navItems.forEach(item => { /* ... navigation menu bas ... */
                item.addEventListener('click', (e) => { e.preventDefault(); if (!currentUser) return; const targetPageId = item.getAttribute('data-page'); showPage(targetPageId); navItems.forEach(nav => nav.classList.remove('active')); item.classList.add('active'); if (targetPageId === 'stats-page') { updateStats(); } });
            });

            // Bouton Nouvelle Séance
            newWorkoutBtn.addEventListener('click', () => {
                if (!currentUser) return;
                 currentWorkoutId = null; // C'est une nouvelle séance
                 clearNewWorkoutForm(); // Réinitialise le formulaire et ajoute le premier exercice vide
                 showPage('new-workout-page');
                 // Déclencher l'animation d'entrée (la classe 'active' est déjà ajoutée par showPage)
                 // L'animation CSS sur #new-workout-page.active s'en charge
            });

            cancelNewWorkoutBtn.addEventListener('click', () => showPage('home-page'));
            saveWorkoutBtn.addEventListener('click', saveWorkout); // Sauvegarde tous les exercices ajoutés
            addExerciseBtn.addEventListener('click', handleAddNewExercise); // Ajoute un exo et navigue vers lui

            // Navigation formulaire exercices
            prevExerciseBtn.addEventListener('click', navigateExerciseForm.bind(null, -1));
            nextExerciseBtn.addEventListener('click', navigateExerciseForm.bind(null, 1));

            backToHomeBtn.addEventListener('click', () => showPage('home-page'));
            deleteWorkoutBtn.addEventListener('click', deleteWorkout);
            satisfactionRange.addEventListener('input', () => { satisfactionValue.textContent = `${satisfactionRange.value}%`; });
        }

        // --- Logique Principale ---
        function setTodayDate() { /* ... */ if(workoutDateInput) { try { const today = new Date().toISOString().split('T')[0]; workoutDateInput.value = today; } catch (e) { console.error("Impossible définir date:", e); workoutDateInput.value = ''; } } }

         function showPage(pageId) {
            if (!currentUser) { showLoginPage(); return; }

            document.querySelectorAll('#app-container > div').forEach(page => {
                page.classList.remove('active');
            });

            const pageToShow = document.getElementById(pageId);
            if (pageToShow) {
                pageToShow.classList.add('active');
            } else {
                console.error(`Page ID "${pageId}" non trouvée. Affichage home-page.`);
                document.getElementById('home-page').classList.add('active');
                pageId = 'home-page';
            }

             // Gérer la nav active
             navItems.forEach(item => { item.classList.remove('active'); });
             const activeNavItem = document.querySelector(`.nav-item[data-page="${pageId === 'stats-page' ? 'stats-page' : 'home-page'}"]`);
             if(activeNavItem) activeNavItem.classList.add('active');

             // Si on affiche la page nouvelle séance, s'assurer que le premier exercice est visible
             if (pageId === 'new-workout-page') {
                 renderActiveExerciseForm(); // Affichera l'exercice à currentExerciseIndex
             }
        }

        // --- Logique Formulaire Nouvelle Séance ---

        function handleAddNewExercise() {
             addExercise(true); // true pour naviguer vers le nouvel exercice
        }

        function addExercise(navigateToNew = false) {
            if (!currentUser) return;
            const exerciseId = `exercise-${Date.now()}`;
            const exerciseDiv = document.createElement('div');
            exerciseDiv.className = 'card exercise'; // Pas 'active-exercise' ici
            exerciseDiv.setAttribute('data-exercise-id', exerciseId);

            exerciseDiv.innerHTML = `
                <div class="exercise-header">
                    <input type="text" placeholder="Nom Exercice" class="exercise-name">
                    <button class="btn btn-danger remove-exercise" style="padding: 0.3rem 0.6rem; flex-shrink: 0;">×</button>
                </div>
                <div class="form-row" style="margin-top: 0.5rem; margin-bottom: 0.5rem; gap: 1rem;">
                     <label style="display: inline-flex; align-items: center; color: #bbb; font-size: 0.9rem;">
                        <input type="checkbox" class="unilateral-checkbox"> Unilatéral
                    </label>
                     <label style="display: inline-flex; align-items: center; color: #bbb; font-size: 0.9rem;">
                        <input type="checkbox" class="superset-checkbox"> Début de Superset
                    </label>
                </div>
                <div class="series-container"></div>
                <button class="btn btn-outline add-series" style="width: 100%; margin-top: 0.5rem; padding: 0.4rem;">+ Ajouter Série</button>
            `;
            exercisesContainer.appendChild(exerciseDiv); // Ajouter au DOM

            // Garder une référence (important pour la navigation)
             workoutExercisesForm = Array.from(exercisesContainer.querySelectorAll('.exercise'));

            // Écouteurs pour cet exercice
            const removeBtn = exerciseDiv.querySelector('.remove-exercise');
             // Gérer la suppression d'exercice dans le formulaire
             removeBtn.addEventListener('click', () => {
                 const indexToRemove = workoutExercisesForm.indexOf(exerciseDiv);
                 if (indexToRemove > -1) {
                     exerciseDiv.remove(); // Supprimer du DOM
                     workoutExercisesForm = Array.from(exercisesContainer.querySelectorAll('.exercise')); // Mettre à jour la liste
                     // Ajuster l'index courant si on supprime l'actuel ou un précédent
                     if (currentExerciseIndex >= indexToRemove) {
                         currentExerciseIndex = Math.max(0, currentExerciseIndex - 1);
                     }
                      // Si on supprime le dernier, l'index doit pointer sur le nouveau dernier (ou 0 si vide)
                     if (currentExerciseIndex >= workoutExercisesForm.length) {
                          currentExerciseIndex = Math.max(0, workoutExercisesForm.length - 1);
                     }
                     renderActiveExerciseForm(); // Afficher le bon exercice après suppression
                 }
             });


            const addSeriesBtn = exerciseDiv.querySelector('.add-series');
            const seriesContainer = exerciseDiv.querySelector('.series-container');
            addSeriesBtn.addEventListener('click', () => addSeries(seriesContainer));

            addSeries(seriesContainer); // Ajouter la première série

             if (navigateToNew) {
                 currentExerciseIndex = workoutExercisesForm.length - 1; // Aller au nouvel exercice ajouté
                 renderActiveExerciseForm();
             } else {
                 updateExerciseNavButtons(); // Juste mettre à jour les boutons si on n'y navigue pas
             }

        }

        function addSeries(container) { /* ... (inchangé) ... */
            if (!currentUser || !container) return; const seriesId = `series-${Date.now()}`; const seriesDiv = document.createElement('div'); seriesDiv.className = 'series'; seriesDiv.setAttribute('data-series-id', seriesId);
            seriesDiv.innerHTML = `<div class="form-row" style="align-items: flex-end; gap: 0.8rem;"> <div class="form-group" style="flex: 1.2;"> <label>Reps</label> <input type="number" class="reps" min="1" placeholder="10" style="padding: 0.4rem;"> </div> <div class="form-group" style="flex: 1.2;"> <label>Charge (kg)</label> <input type="number" class="weight" min="0" step="0.1" placeholder="20" style="padding: 0.4rem;"> </div> <div class="form-group" style="flex: 1; display: flex; align-items: center; padding-bottom: 0.6rem; min-width: 100px;"> <label style="display: inline-flex; align-items: center; color: #bbb; font-size: 0.8rem; margin-bottom: 0; white-space: nowrap;"> <input type="checkbox" class="degressive-checkbox" style="margin-right: 0.3rem;"> Dégressive </label> </div> <button class="btn btn-danger remove-series" style="padding: 0.3rem 0.6rem; margin-bottom: 0.6rem; flex-basis: 30px; flex-grow: 0; align-self: center;">×</button> </div>`;
            container.appendChild(seriesDiv); const removeBtn = seriesDiv.querySelector('.remove-series'); removeBtn.addEventListener('click', () => seriesDiv.remove());
        }

        function navigateExerciseForm(direction) {
            const newIndex = currentExerciseIndex + direction;
            if (newIndex >= 0 && newIndex < workoutExercisesForm.length) {
                currentExerciseIndex = newIndex;
                renderActiveExerciseForm();
            }
        }

        function renderActiveExerciseForm() {
             workoutExercisesForm = Array.from(exercisesContainer.querySelectorAll('.exercise')); // MAJ référence
            // Cacher tous les exercices du formulaire
             workoutExercisesForm.forEach(ex => ex.classList.remove('active-exercise'));

            // Afficher l'exercice courant s'il existe
            if (currentExerciseIndex >= 0 && currentExerciseIndex < workoutExercisesForm.length) {
                 const currentExDiv = workoutExercisesForm[currentExerciseIndex];
                 currentExDiv.classList.add('active-exercise');
                 // Appliquer style superset si coché
                  const isSuperset = currentExDiv.querySelector('.superset-checkbox').checked;
                  if (isSuperset) {
                      currentExDiv.classList.add('is-superset-start');
                  } else {
                      currentExDiv.classList.remove('is-superset-start');
                  }

            }

            // Mettre à jour l'indicateur et les boutons
            updateExerciseNavButtons();
        }

         function updateExerciseNavButtons() {
             const totalExercises = workoutExercisesForm.length;
             if (totalExercises === 0) {
                 currentExerciseIndicator.textContent = "(Aucun exercice)";
                 prevExerciseBtn.disabled = true;
                 nextExerciseBtn.disabled = true;
             } else {
                 currentExerciseIndicator.textContent = `(${currentExerciseIndex + 1}/${totalExercises})`;
                 prevExerciseBtn.disabled = currentExerciseIndex === 0;
                 nextExerciseBtn.disabled = currentExerciseIndex === totalExercises - 1;
             }
         }


        function clearNewWorkoutForm() {
            if (!currentUser) return;
            document.getElementById('workout-name').value = '';
            document.getElementById('workout-duration').value = '';
            setTodayDate();
            exercisesContainer.innerHTML = ''; // Vider le conteneur
            workoutExercisesForm = []; // Vider la référence
            satisfactionRange.value = 75;
            satisfactionValue.textContent = '75%';
            currentWorkoutId = null;
             currentExerciseIndex = 0; // Revenir au premier potentiel exercice
            addExercise(false); // Ajouter le premier bloc d'exercice vide mais ne pas naviguer (render s'en charge)
            renderActiveExerciseForm(); // Afficher le premier exercice et MAJ boutons
        }

        function saveWorkout() {
            if (!currentUser) return;

            const workoutName = document.getElementById('workout-name').value.trim();
            const workoutDate = document.getElementById('workout-date').value;
            const workoutDuration = parseInt(document.getElementById('workout-duration').value) || 0;
            const satisfaction = parseInt(document.getElementById('satisfaction').value);

            if (!workoutName) { alert("Nom séance requis."); return; }
            if (!workoutDate) { alert("Date requise."); return; }
            if (workoutDuration <= 0) { alert("Durée invalide."); return; }

            // Lire depuis les divs d'exercices présents dans le conteneur du formulaire
            const exerciseElements = workoutExercisesForm; // Utiliser notre référence à jour
            const exercises = [];
            if (exerciseElements.length === 0) { alert("Ajoutez au moins un exercice."); return; }

            let validationError = null;
             exerciseElements.forEach(exerciseEl => {
                if (validationError) return;
                const exerciseName = exerciseEl.querySelector('.exercise-name').value.trim();
                 const isUnilateral = exerciseEl.querySelector('.unilateral-checkbox').checked;
                 const isSupersetStart = exerciseEl.querySelector('.superset-checkbox').checked; // Récupérer état superset

                if (!exerciseName) { validationError = "Nommez tous les exercices."; return; }

                const series = [];
                const seriesElements = exerciseEl.querySelectorAll('.series');
                if (seriesElements.length === 0) { validationError = `Exercice "${exerciseName}" sans série.`; return; }

                seriesElements.forEach(seriesEl => {
                     if (validationError) return;
                    const repsInput = seriesEl.querySelector('.reps'); const weightInput = seriesEl.querySelector('.weight');
                    const reps = parseInt(repsInput.value) || 0; const weight = parseFloat(weightInput.value) || 0;
                    const isDegressive = seriesEl.querySelector('.degressive-checkbox').checked;
                    if (reps <= 0) { validationError = `Reps invalides pour "${exerciseName}".`; repsInput.focus(); return; }
                    if (weight < 0) { validationError = `Charge invalide pour "${exerciseName}".`; weightInput.focus(); return; }
                    series.push({ reps, weight, isDegressive });
                });

                if (!validationError) {
                     // Ajouter isSupersetStart à l'objet exercice
                    exercises.push({ name: exerciseName, isUnilateral, isSupersetStart, series });
                }
            });

            if (validationError) { alert(validationError); return; }

            // --- Calcul Tonnage ---
            let totalTonnage = 0;
            exercises.forEach(exercise => {
                exercise.series.forEach(serie => {
                    const weightFactor = exercise.isUnilateral ? 2 : 1;
                    totalTonnage += serie.reps * serie.weight * weightFactor;
                });
            });

            const workout = {
                id: currentWorkoutId || `workout-${Date.now()}`, name: workoutName, date: workoutDate, duration: workoutDuration,
                exercises: exercises, // Tableau d'exercices avec potentiellement isSupersetStart
                totalTonnage: totalTonnage, satisfaction: satisfaction
            };

            const existingIndex = workouts.findIndex(w => w.id === workout.id);
            if (existingIndex > -1) { workouts[existingIndex] = workout; } else { workouts.push(workout); }

            saveWorkouts();

             // Animation Confettis !
             confetti({ particleCount: 150, spread: 90, origin: { y: 0.6 } });

            showPage('home-page');
            renderWorkoutsList();
        }

        // --- Affichage et Stats (avec gestion superset dans l'affichage détail) ---
        function renderWorkoutsList() { /* ... (inchangé sauf appel updateStats) ... */
            if (!currentUser) return; workoutsList.innerHTML = ''; if (workouts.length === 0) { emptyWorkoutMessage.classList.remove('hidden'); updateStats(); return; } emptyWorkoutMessage.classList.add('hidden');
            const sortedWorkouts = [...workouts].sort((a, b) => new Date(b.date) - new Date(a.date));
            sortedWorkouts.forEach(workout => { const workoutDate = new Date(workout.date).toLocaleDateString('fr-FR', { year: 'numeric', month: 'short', day: 'numeric' }); const workoutDiv = document.createElement('div'); workoutDiv.className = 'card workout-card'; workoutDiv.setAttribute('data-workout-id', workout.id); workoutDiv.innerHTML = `<div class="workout-header"><h3 style="margin-bottom: 0.5rem;">${workout.name}</h3><div class="badge">${workoutDate}</div></div><div class="workout-details" style="font-size: 0.9rem; color: #ccc; margin-top: 0.5rem;"><span>${workout.duration} min</span> | <span>${workout.exercises.length} exo${workout.exercises.length > 1 ? 's' : ''}</span> | <span>${workout.totalTonnage.toFixed(1)} kg</span> | <span>${workout.satisfaction}%</span></div>`; workoutDiv.addEventListener('click', () => displayWorkoutDetails(workout.id)); workoutsList.appendChild(workoutDiv); });
            updateStats();
         }

        function displayWorkoutDetails(workoutId) {
            if (!currentUser) return;
            const workout = workouts.find(w => w.id === workoutId);
            if (!workout) { console.error("Séance non trouvée:", workoutId); showPage('home-page'); return; }

            // MAJ Infos générales (inchangé)
             document.getElementById('detail-workout-name').textContent = workout.name; document.getElementById('detail-date').textContent = new Date(workout.date).toLocaleDateString('fr-FR'); document.getElementById('detail-duration').textContent = workout.duration; document.getElementById('detail-tonnage').textContent = workout.totalTonnage.toFixed(1); document.getElementById('detail-satisfaction').textContent = `${workout.satisfaction}%`; document.getElementById('detail-exercises-count').textContent = workout.exercises.length;

            const detailExercisesContainer = document.getElementById('detail-exercises-container');
            detailExercisesContainer.innerHTML = '';

            // MAJ Exercices avec indicateur Superset
            workout.exercises.forEach((exercise, index) => {
                const exerciseDiv = document.createElement('div');
                 // Ajouter des classes pour le style Superset
                 exerciseDiv.classList.add('card', 'detail-exercise-card'); // Classe de base
                 let isContinuation = false;
                 if (exercise.isSupersetStart) {
                     exerciseDiv.classList.add('is-superset-start');
                 }
                 // Vérifier si l'exercice *précédent* était un début de superset
                 if (index > 0 && workout.exercises[index - 1].isSupersetStart) {
                     exerciseDiv.classList.add('is-superset-continuation');
                     isContinuation = true;
                 }


                let seriesHtml = '';
                exercise.series.forEach((serie, sIndex) => { /* ... (inchangé) ... */
                     const degressiveLabel = serie.isDegressive ? ' <span class="badge" style="font-size: 0.7rem; background-color: var(--accent-dark);">Dégr.</span>' : ''; const weightFactor = exercise.isUnilateral ? 2 : 1; const seriesTonnage = serie.reps * serie.weight * weightFactor;
                     seriesHtml += `<div class="exercise-summary"><div class="flex-between"><span>Série ${sIndex + 1}: ${serie.reps} reps × ${serie.weight} kg${degressiveLabel}</span><span style="color: #aaa;">(${seriesTonnage.toFixed(1)} kg)</span></div></div>`;
                 });

                const unilateralLabel = exercise.isUnilateral ? ' <span class="badge" style="font-size: 0.7rem;">Unilat.</span>' : '';
                 // Ajout badge Superset si c'est le début
                 const supersetLabel = exercise.isSupersetStart ? ` <span class="badge badge-superset" style="font-size: 0.7rem;">Superset 🔽</span>` : '';

                exerciseDiv.innerHTML = `
                    <h3 style="font-size: 1.1rem; margin-bottom: 0.5rem;">${exercise.name}${unilateralLabel}${supersetLabel}</h3>
                    <div class="series-summary-container">
                        ${seriesHtml}
                    </div>`;
                detailExercisesContainer.appendChild(exerciseDiv);
            });

            currentWorkoutId = workoutId;
            showPage('workout-details-page');
        }

        function deleteWorkout() { /* ... (inchangé) ... */
             if (!currentUser || !currentWorkoutId) return; const workoutToDelete = workouts.find(w => w.id === currentWorkoutId); if (!workoutToDelete) return; const confirmDelete = confirm(`Supprimer séance "${workoutToDelete.name}" du ${new Date(workoutToDelete.date).toLocaleDateString('fr-FR')} ?`); if (!confirmDelete) return; workouts = workouts.filter(w => w.id !== currentWorkoutId); saveWorkouts(); currentWorkoutId = null; showPage('home-page'); renderWorkoutsList();
        }

        function updateStats() { /* ... (inchangé) ... */
             if (!currentUser) return; const workoutCount = workouts.length; document.getElementById('stats-workout-count').textContent = workoutCount; if (workoutCount === 0) { document.getElementById('stats-avg-tonnage').textContent = '0'; document.getElementById('stats-avg-satisfaction').textContent = '0%'; return; } const totalTonnageAll = workouts.reduce((sum, workout) => sum + (workout.totalTonnage || 0), 0); const avgTonnage = totalTonnageAll / workoutCount; document.getElementById('stats-avg-tonnage').textContent = avgTonnage.toFixed(1); const totalSatisfaction = workouts.reduce((sum, workout) => sum + (workout.satisfaction || 0), 0); const avgSatisfaction = totalSatisfaction / workoutCount; document.getElementById('stats-avg-satisfaction').textContent = `${Math.round(avgSatisfaction)}%`;
        }

    </script>
</body>
</html>