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Animación de carga CSS: Cargador circular

HTML

<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Connexion - VrcFoss</title>
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap" rel="stylesheet">
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

body {
            background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0e0e10 100%);
            color: white;
            font-family: 'Poppins', sans-serif;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }

/* Fond étoilé animé */
        .stars {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
        }

.star {
            position: absolute;
            width: 2px;
            height: 2px;
            background: white;
            border-radius: 50%;
            animation: twinkle 4s infinite;
        }

.star:nth-child(odd) {
            background: #00ffff;
            animation-delay: -2s;
        }

.star:nth-child(3n) {
            animation-delay: -1s;
        }

@keyframes twinkle {
            0%, 100% { opacity: 0.3; }
            50% { opacity: 1; }
        }

/* Container principal */
        .auth-container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 2rem;
            position: relative;
            z-index: 10;
        }

/* Boîte d'authentification */
        .auth-box {
            background: rgba(15, 15, 20, 0.8);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(0, 255, 255, 0.2);
            border-radius: 20px;
            padding: 3rem;
            width: 100%;
            max-width: 450px;
            box-shadow: 
                0 0 50px rgba(0, 255, 255, 0.1),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
            position: relative;
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

.auth-box.active {
            box-shadow: 
                0 0 40px rgba(0, 255, 255, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
        }

/* Titre */
        .auth-box h2 {
            text-align: center;
            margin-bottom: 2rem;
            font-weight: 600;
            font-size: 2rem;
            color: #ffffff;
            position: relative;
        }

.auth-box h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 2px;
            background: linear-gradient(90deg, transparent, #00ffff, transparent);
        }

/* Groupes de formulaire */
        .form-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

label {
            display: block;
            margin-bottom: 0.5rem;
            font-size: 0.9rem;
            color: #ccc;
            transition: color 0.3s ease;
        }

/* Champs de saisie */
        .input-wrapper {
            position: relative;
        }

input[type="email"],
        input[type="password"],
        input[type="text"] {
            width: 100%;
            padding: 1rem;
            border: 2px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.05);
            color: white;
            font-size: 1rem;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
        }

input::placeholder {
            color: #666;
            transition: color 0.3s ease;
        }

input:focus {
            outline: none;
            border-color: #00ffff;
            background: rgba(0, 255, 255, 0.05);
            box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
            transform: translateY(-1px);
        }

input:focus::placeholder {
            color: #999;
        }

input:focus + .input-glow {
            opacity: 1;
        }

.input-glow {
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, #00ffff, transparent, #00ffff);
            border-radius: 14px;
            z-index: -1;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

/* Bouton principal */
        .cta-button {
            width: 100%;
            margin-top: 1.5rem;
            padding: 1rem;
            border: none;
            border-radius: 12px;
            background: linear-gradient(135deg, #00ffff, #00cccc);
            color: #0a0a0a;
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

.cta-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.6s ease;
        }

.cta-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0, 255, 255, 0.3);
        }

.cta-button:hover::before {
            left: 100%;
        }

.cta-button:active {
            transform: translateY(0);
        }

/* Lien de basculement */
        .switch-link {
            text-align: center;
            margin-top: 1.5rem;
            font-size: 0.95rem;
            color: #ccc;
        }

.switch-link a {
            color: #00ffff;
            text-decoration: none;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
        }

.switch-link a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: #00ffff;
            transition: width 0.3s ease;
        }

.switch-link a:hover {
            color: #ffffff;
        }

.switch-link a:hover::after {
            width: 100%;
        }

/* Animations de transition */
        .auth-box {
            opacity: 1;
            transform: translateX(0);
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

.auth-box.hidden {
            display: none !important;
        }

.auth-box.slide-left {
            opacity: 0;
            transform: translateX(-100%);
        }

.auth-box.slide-right {
            opacity: 0;
            transform: translateX(100%);
        }

/* Messages d'erreur */
        .error-message {
            color: #ff4444;
            font-size: 0.85rem;
            margin-top: 0.5rem;
            opacity: 0;
            transform: translateY(-10px);
            transition: all 0.3s ease;
            display: none;
        }

.error-message.show {
            opacity: 1;
            transform: translateY(0);
            display: block;
        }

.form-group.error input {
            border-color: #ff4444 !important;
            box-shadow: 0 0 10px rgba(255, 68, 68, 0.3) !important;
        }

.form-group.error label {
            color: #ff4444;
        }
        @media (max-width: 480px) {
            .auth-container {
                padding: 1rem;
            }
            
            .auth-box {
                padding: 2rem;
            }
            
            .auth-box h2 {
                font-size: 1.5rem;
            }
        }

/* Particules flottantes */
        .floating-particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 2;
        }

.particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: rgba(0, 255, 255, 0.3);
            border-radius: 50%;
            animation: float 6s infinite ease-in-out;
        }

@keyframes float {
            0%, 100% {
                transform: translateY(0) rotate(0deg);
                opacity: 0;
            }
            50% {
                transform: translateY(-100px) rotate(180deg);
                opacity: 1;
            }
        }
    </style>
</head>
<body>
    
    <div class="stars" id="stars"></div>
    
    
    <div class="floating-particles" id="particles"></div>

<main class="auth-container">
        
        <section class="auth-box" id="login-box">
            <h2>Connexion</h2>
            <form id="login-form">
                <div class="form-group">
                    <label for="email">Email</label>
                    <div class="input-wrapper">
                        <input type="email" id="email" name="email" placeholder="exemple@vrcfoss.fr" required autocomplete="username">
                        <div class="input-glow"></div>
                    </div>
                    <div class="error-message" id="email-error"></div>
                </div>
                <div class="form-group">
                    <label for="password">Mot de passe</label>
                    <div class="input-wrapper">
                        <input type="password" id="password" name="password" placeholder="••••••••" required autocomplete="current-password">
                        <div class="input-glow"></div>
                    </div>
                    <div class="error-message" id="password-error"></div>
                </div>
                <button type="submit" class="cta-button">Se connecter</button>
                <p class="switch-link">
                    Pas encore de compte ? <a id="show-signup">S'inscrire</a>
                </p>
            </form>
        </section>

<section class="auth-box hidden" id="signup-box">
            <h2>Inscription</h2>
            <form id="signup-form">
                <div class="form-group">
                    <label for="signup-name">Nom</label>
                    <div class="input-wrapper">
                        <input type="text" id="signup-name" name="signup-name" placeholder="John Doe" required autocomplete="name">
                        <div class="input-glow"></div>
                    </div>
                    <div class="error-message" id="signup-name-error"></div>
                </div>
                <div class="form-group">
                    <label for="signup-email">Email</label>
                    <div class="input-wrapper">
                        <input type="email" id="signup-email" name="signup-email" placeholder="exemple@vrcfoss.fr" required autocomplete="username">
                        <div class="input-glow"></div>
                    </div>
                    <div class="error-message" id="signup-email-error"></div>
                </div>
                <div class="form-group">
                    <label for="signup-password">Mot de passe</label>
                    <div class="input-wrapper">
                        <input type="password" id="signup-password" name="signup-password" placeholder="••••••••" required autocomplete="new-password">
                        <div class="input-glow"></div>
                    </div>
                    <div class="error-message" id="signup-password-error"></div>
                </div>
                <div class="form-group">
                    <label for="signup-confirm">Confirmer le mot de passe</label>
                    <div class="input-wrapper">
                        <input type="password" id="signup-confirm" name="signup-confirm" placeholder="••••••••" required autocomplete="new-password">
                        <div class="input-glow"></div>
                    </div>
                    <div class="error-message" id="signup-confirm-error"></div>
                </div>
                <button type="submit" class="cta-button">Créer un compte</button>
                <p class="switch-link">
                    Déjà inscrit ? <a id="show-login">Se connecter</a>
                </p>
            </form>
        </section>
    </main>

// Fonctions de validation
        function showError(inputId, message) {
            const input = document.getElementById(inputId);
            const formGroup = input.closest('.form-group');
            const errorDiv = document.getElementById(inputId + '-error');
            
            formGroup.classList.add('error');
            errorDiv.textContent = message;
            errorDiv.classList.add('show');
        }

function validateEmail(email) {
            const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
            return emailRegex.test(email);
        }

function validatePassword(password) {
            return password.length >= 6;
        }
        let isTransitioning = false;

// Fonction de transition entre les formulaires
        function switchForms(hideBox, showBox, direction) {
            if (isTransitioning) return; // Empêcher les clics multiples
            
            isTransitioning = true;
            
            // Préparer la nouvelle boîte
            showBox.classList.remove('hidden');
            showBox.style.display = 'block';
            
            if (direction === 'toSignup') {
                showBox.classList.add('slide-right');
            } else {
                showBox.classList.add('slide-left');
            }
            
            // Forcer le reflow pour s'assurer que les styles sont appliqués
            showBox.offsetHeight;
            
            // Démarrer la transition
            setTimeout(() => {
                if (direction === 'toSignup') {
                    hideBox.classList.add('slide-left');
                    showBox.classList.remove('slide-right');
                } else {
                    hideBox.classList.add('slide-right');
                    showBox.classList.remove('slide-left');
                }
            }, 10);
            
            // Nettoyer après la transition
            setTimeout(() => {
                hideBox.classList.add('hidden');
                hideBox.classList.remove('slide-left', 'slide-right');
                showBox.classList.remove('slide-left', 'slide-right');
                isTransitioning = false;
            }, 500);
        }

// Gestionnaires d'événements
        showSignup.addEventListener('click', function(e) {
            e.preventDefault();
            switchForms(loginBox, signupBox, 'toSignup');
        });

showLogin.addEventListener('click', function(e) {
            e.preventDefault();
            switchForms(signupBox, loginBox, 'toLogin');
        });

// Génération des étoiles
        function createStars() {
            const starsContainer = document.getElementById('stars');
            const numberOfStars = 100;

for (let i = 0; i < numberOfStars; i++) {
                const star = document.createElement('div');
                star.className = 'star';
                star.style.left = Math.random() * 100 + '%';
                star.style.top = Math.random() * 100 + '%';
                star.style.animationDelay = Math.random() * 4 + 's';
                starsContainer.appendChild(star);
            }
        }

// Génération des particules flottantes
        function createParticles() {
            const particlesContainer = document.getElementById('particles');
            const numberOfParticles = 20;

for (let i = 0; i < numberOfParticles; i++) {
                const particle = document.createElement('div');
                particle.className = 'particle';
                particle.style.left = Math.random() * 100 + '%';
                particle.style.top = '100%';
                particle.style.animationDelay = Math.random() * 6 + 's';
                particle.style.animationDuration = (Math.random() * 3 + 4) + 's';
                particlesContainer.appendChild(particle);
            }
        }

// Effet de focus amélioré pour les champs
        document.querySelectorAll('input').forEach(input => {
            input.addEventListener('focus', function() {
                this.closest('.auth-box').classList.add('active');
            });

input.addEventListener('blur', function() {
                // Vérifier si aucun autre input dans la même boîte n'a le focus
                setTimeout(() => {
                    const authBox = this.closest('.auth-box');
                    const focusedInput = authBox.querySelector('input:focus');
                    if (!focusedInput) {
                        authBox.classList.remove('active');
                    }
                }, 10);
            });
        });

// Validation des formulaires avec feedback visuel
        document.getElementById('login-form').addEventListener('submit', function(e) {
            e.preventDefault();
            clearAllErrors('login-form');
            
            const email = document.getElementById('email').value.trim();
            const password = document.getElementById('password').value;
            let hasErrors = false;
            
            // Validation email
            if (!email) {
                showError('email', 'L\'email est requis');
                hasErrors = true;
            } else if (!validateEmail(email)) {
                showError('email', 'Format d\'email invalide');
                hasErrors = true;
            }
            
            // Validation mot de passe
            if (!password) {
                showError('password', 'Le mot de passe est requis');
                hasErrors = true;
            } else if (password.length < 6) {
                showError('password', 'Le mot de passe doit contenir au moins 6 caractères');
                hasErrors = true;
            }
            
            if (hasErrors) return;
            
            // Animation de succès
            const button = this.querySelector('.cta-button');
            const originalText = button.textContent;
            button.style.background = 'linear-gradient(135deg, #00ff88, #00cc66)';
            button.textContent = 'Connexion réussie !';
            
            setTimeout(() => {
                button.style.background = '';
                button.textContent = originalText;
            }, 2000);
        });

// Effacement des erreurs en temps réel
        document.querySelectorAll('input').forEach(input => {
            input.addEventListener('input', function() {
                if (this.closest('.form-group').classList.contains('error')) {
                    clearError(this.id);
                }
            });
        });
        document.addEventListener('DOMContentLoaded', function() {
            createStars();
            createParticles();
        });

// Effet de parallaxe sur le mouvement de la souris
        document.addEventListener('mousemove', function(e) {
            const mouseX = e.clientX / window.innerWidth;
            const mouseY = e.clientY / window.innerHeight;
            
            const stars = document.querySelectorAll('.star');
            stars.forEach((star, index) => {
                const speed = (index % 3 + 1) * 0.5;
                const x = (mouseX - 0.5) * speed;
                const y = (mouseY - 0.5) * speed;
                star.style.transform = `translate(${x}px, ${y}px)`;
            });
        });
    </script>
</body>
</html>

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