:root {
            --primary: #2D3748;
            --primary-dark: #1A202C;
            --primary-light: #4A5568;
            --accent: #4C51BF;
            --accent-light: #667EEA;
            --success: #38A169;
            --error: #E53E3E;
            --warning: #DD6B20;
            --background: #FAFAFA;
            --surface: #FFFFFF;
            --border: #E2E8F0;
            --text-primary: #1A202C;
            --text-secondary: #4A5568;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --space-unit: 1rem;
            --space-xxs: calc(var(--space-unit) * 0.25);
            --space-xs: calc(var(--space-unit) * 0.5);
            --space-sm: calc(var(--space-unit) * 0.75);
            --space-md: var(--space-unit);
            --space-lg: calc(var(--space-unit) * 1.5);
            --space-xl: calc(var(--space-unit) * 2);
            --space-xxl: calc(var(--space-unit) * 3);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Plus Jakarta Sans', sans-serif;
            background: var(--background);
            color: var(--text-primary);
            line-height: 1.7;
            scroll-behavior: smooth;
        }

        /* Section principale */
        .subscription-section {
            max-width: 800px;
            margin: 140px auto 80px;
            padding: 0 6%;
            animation: fadeIn 0.6s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .subscription-header {
            text-align: center;
            margin-bottom: var(--space-xxl);
        }

        .happy-heading {
            font-family: 'Playfair Display', serif;
            font-size: 2.5rem;
            margin: 0 auto var(--space-xs);
            color: var(--primary-dark);
            line-height: 1.2;
            font-weight: 700;
        }

        .happy-subheading {
            font-size: 1.1rem;
            color: var(--accent);
            letter-spacing: 0.1em;
            margin-bottom: var(--space-xs);
            font-weight: 500;
            text-transform: uppercase;
        }

        /* Formulaire */
        .subscription-form {
            background: var(--surface);
            padding: var(--space-xxl);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-xl);
            transition: var(--transition);
            border: 1px solid var(--border);
        }

        .subscription-form:hover {
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.12);
        }

        .form-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-xl) var(--space-lg);
        }

        .form-group {
            position: relative;
            margin-bottom: var(--space-lg);
        }

        .form-label {
            display: block;
            margin-bottom: var(--space-xs);
            font-weight: 600;
            color: var(--primary-light);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: var(--space-xxs);
        }

        .form-label:after {
            content: '*';
            color: var(--error);
            font-size: 0.9em;
            margin-left: 2px;
        }

        .form-input {
            width: 100%;
            padding: 14px 20px;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            transition: var(--transition);
            font-size: 1rem;
            background: var(--surface);
            color: var(--text-primary);
        }

        .form-input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(76, 81, 191, 0.1);
            outline: none;
        }

        .form-input::placeholder {
            color: var(--text-secondary);
            opacity: 0.6;
        }

        .input-hint {
            display: block;
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: var(--space-xxs);
            opacity: 0.8;
        }

        /* Checkbox stylisé */
        .form-checkbox {
            display: flex;
            align-items: flex-start;
            gap: var(--space-xs);
            margin: var(--space-xl) 0;
            padding: var(--space-sm);
            background: rgba(76, 81, 191, 0.03);
            border-radius: var(--radius-md);
            line-height: 1.5;
            border-left: 4px solid var(--accent);
        }

        .form-checkbox input {
            margin-top: 3px;
            flex-shrink: 0;
            accent-color: var(--accent);
        }

        .form-checkbox label {
            font-size: 0.9rem;
            color: var(--text-primary);
        }

        .form-checkbox label a {
            color: var(--accent);
            text-decoration: underline;
            text-underline-offset: 2px;
            font-weight: 500;
        }

        /* Bouton */
        .submit-button {
            background: var(--accent);
            color: white;
            padding: 18px 40px;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin: var(--space-xl) auto;
            display: block;
            max-width: 400px;
            font-size: 1.05rem;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .submit-button:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

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

        /* Messages d'erreur */
        .error-message {
            color: var(--error);
            font-size: 0.85rem;
            margin-top: var(--space-xxs);
            font-weight: 500;
        }

        .form-input:invalid:not(:placeholder-shown) {
            border-color: var(--error);
            background: #FFF5F5;
        }

        /* Alertes */
        .alert {
            padding: 16px;
            border-radius: var(--radius-sm);
            margin-bottom: var(--space-lg);
            font-size: 14px;
            box-shadow: var(--shadow-sm);
        }

        .alert-danger {
            background-color: #FEF2F2;
            color: var(--error);
            border: 1px solid #FECACA;
        }

        .alert-info {
            background-color: #EBF8FF;
            color: #2B6CB0;
            border: 1px solid #BEE3F8;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .happy-heading {
                font-size: 2rem;
            }
            
            .subscription-form {
                padding: var(--space-lg);
            }
            
            .form-grid {
                grid-template-columns: 1fr;
                gap: var(--space-md);
            }
            
            .submit-button {
                width: 100%;
                max-width: none;
            }
        }

        /* Animation des champs */
        .form-group {
            animation: slideUp 0.5s ease-out forwards;
            opacity: 0;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Délai d'animation pour chaque champ */
        .form-group:nth-child(1) { animation-delay: 0.1s; }
        .form-group:nth-child(2) { animation-delay: 0.2s; }
        .form-group:nth-child(3) { animation-delay: 0.3s; }
        .form-group:nth-child(4) { animation-delay: 0.4s; }
        .form-group:nth-child(5) { animation-delay: 0.5s; }
        .form-group:nth-child(6) { animation-delay: 0.6s; }
        .form-checkbox { animation-delay: 0.7s; }
        .submit-button { animation-delay: 0.8s; }