  @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');
        
        :root {
            --ig-primary: #000000;
            --ig-secondary: #262626;
            /* Couleur ajustée pour un meilleur contraste (WCAG AA) */
            --ig-tertiary: #767676;
            --ig-light: #fafafa;
            --ig-white: #ffffff;
            --ig-border: #dbdbdb;
            --ig-blue: #0095f6;
            --ig-gradient: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
            --ig-shadow: 0 2px 10px rgba(0,0,0,0.1);
            --ig-shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
        }
        
        * {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        
        body {
            background-color: var(--ig-white);
            color: var(--ig-primary);
            line-height: 1.6;
        }

        /* Amélioration de l'accessibilité : focus visible pour la navigation au clavier */
        *:focus-visible {
            outline: 3px solid var(--ig-blue);
            outline-offset: 2px;
            border-radius: 4px;
            transition: outline-offset 0.1s ease;
        }
        
        /* Typography Instagram Style */
        .ig-title {
            font-weight: 400;
            letter-spacing: -0.02em;
            background: var(--ig-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        
        .ig-subtitle {
            font-weight: 600;
            color: var(--ig-secondary);
            letter-spacing: -0.01em;
        }
        
        .ig-text {
            color: var(--ig-secondary);
            font-weight: 400;
        }
        
        .ig-text-light {
            color: var(--ig-tertiary);
            font-weight: 400;
        }
        
        /* Buttons Instagram Style */
        .ig-btn-primary {
            background: var(--ig-blue);
            color: white;
            font-weight: 600;
            border-radius: 8px;
            padding: 12px 24px;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 14px;
            letter-spacing: 0.02em;
        }
        
        .ig-btn-primary:hover {
            background: #1877f2;
            transform: translateY(-1px);
            box-shadow: var(--ig-shadow-hover);
        }
        
        .ig-btn-secondary {
            background: transparent;
            color: var(--ig-secondary);
            font-weight: 600;
            border: 1px solid var(--ig-border);
            border-radius: 8px;
            padding: 12px 24px;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 14px;
        }
        
        .ig-btn-secondary:hover {
            background: var(--ig-light);
            border-color: var(--ig-secondary);
        }
        
        .ig-btn-gradient {
            background: var(--ig-gradient);
            color: white;
            font-weight: 700;
            border-radius: 12px;
            padding: 16px 32px;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 16px;
            letter-spacing: 0.02em;
            text-transform: uppercase;
            box-shadow: var(--ig-shadow);
        }
        
        .ig-btn-gradient:hover {
            transform: translateY(-2px);
            box-shadow: var(--ig-shadow-hover);
        }
        
        /* Cards Instagram Style */
        .ig-card {
            background: var(--ig-white);
            border: 1px solid var(--ig-border);
            border-radius: 12px;
            padding: 24px;
            transition: all 0.3s ease;
            box-shadow: var(--ig-shadow);
        }
        
        .ig-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--ig-shadow-hover);
            border-color: var(--ig-tertiary);
        }
        
        /* Navigation Instagram Style */
        .ig-nav {
            background: var(--ig-white);
            border-bottom: 1px solid var(--ig-border);
            -webkit-backdrop-filter: blur(10px);
            backdrop-filter: blur(10px);
        }
        
        .ig-nav-link {
            color: var(--ig-secondary);
            font-weight: 500;
            font-size: 14px;
            transition: all 0.2s ease;
            position: relative;
        }
        
        .ig-nav-link:hover {
            color: var(--ig-primary);
        }
        
        .ig-nav-link.active {
            color: var(--ig-primary);
            font-weight: 600;
        }
        
        .ig-nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -16px;
            left: 50%;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            background: var(--ig-primary);
            border-radius: 50%;
        }
        
        /* Hero Section Instagram Style */
        .ig-hero {
            background: linear-gradient(135deg, var(--ig-light) 0%, var(--ig-white) 100%);
            position: relative;
            overflow: hidden;
        }
        
        .ig-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f0f0f0' fill-opacity='0.3'%3E%3Ccircle cx='30' cy='30' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.5;
        }
        
        /* Portfolio Grid Instagram Style */
        .ig-portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1px;
            background: var(--ig-border);
            border-radius: 12px;
            overflow: hidden;
        }
        
        .ig-portfolio-item {
            aspect-ratio: 1;
            background: var(--ig-white);
            position: relative;
            overflow: hidden;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .ig-portfolio-item:hover {
            transform: scale(1.02);
        }
        
        .ig-portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.7);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: all 0.3s ease;
        }
        
        .ig-portfolio-item:hover .ig-portfolio-overlay {
            opacity: 1;
        }
        
        /* Form Instagram Style */
        .ig-form-group {
            margin-bottom: 16px;
        }
        
        .ig-form-label {
            display: block;
            font-size: 12px;
            font-weight: 600;
            color: var(--ig-tertiary);
            margin-bottom: 6px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        
        .ig-form-input {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--ig-border);
            border-radius: 8px;
            background: var(--ig-white);
            color: var(--ig-secondary);
            font-size: 14px;
            transition: all 0.2s ease;
        }
        
        .ig-form-input:focus {
            outline: none;
            /* Le style :focus-visible gère maintenant l'outline pour l'accessibilité */
            border-color: var(--ig-blue);
            box-shadow: 0 0 0 2px rgba(0, 149, 246, 0.1);
        }
        
        /* Floating CTA Instagram Style */
        .ig-floating-cta {
            position: fixed;
            bottom: 24px;
            right: 24px;
            z-index: 1000;
            background: var(--ig-gradient);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 16px 24px;
            font-weight: 700;
            font-size: 14px;
            cursor: pointer;
            box-shadow: 0 4px 20px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
            animation: ig-pulse 3s infinite;
        }
        
        .ig-floating-cta:hover {
            transform: translateY(-2px) scale(1.05);
            box-shadow: 0 6px 25px rgba(0,0,0,0.3);
        }
        
        @keyframes ig-pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }
        
        /* Modal Instagram Style */
        .ig-modal {
            background: rgba(0,0,0,0.8);
            -webkit-backdrop-filter: blur(4px);
            backdrop-filter: blur(4px);
        }
        
        .ig-modal-content {
            background: var(--ig-white);
            border-radius: 16px;
            max-width: 400px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .ig-title {
                font-size: 1.5rem;
            }
            
            .ig-card {
                padding: 20px;
            }
            
            .ig-floating-cta {
                bottom: 20px;
                right: 20px;
                padding: 14px 20px;
                font-size: 13px;
            }
        }
        
        @media (max-width: 480px) {
            .ig-title {
                font-size: 1.5rem;
            }
            
            .ig-card {
                padding: 16px;
            }
            
            .ig-btn-gradient {
                padding: 14px 28px;
                font-size: 14px;
            }
        }
        
        /* Large screens optimization */
        @media (min-width: 1440px) {
            .ig-section {
                padding: 100px 0;
            }
            
            .ig-title {
                font-size: 1.5rem;
            }
            
            .ig-subtitle {
                font-size: 1.5rem;
            }
            
            .ig-card {
                padding: 32px;
            }
            
            .ig-portfolio-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        
        @media (min-width: 1920px) {
            .ig-section {
                padding: 120px 0;
            }
            
            .max-w-6xl {
                max-width: 80rem;
            }
        }
        
        /* Animations */
        /*
          Performance Optimization:
          Replaced keyframe animations with a more performant class-based transition system.
          The initial state is defined on the base classes, and the '.is-visible' class,
          added by JavaScript's IntersectionObserver, triggers the transition.
        */
        .ig-fade-in, .ig-slide-up {
            opacity: 0;
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

        .ig-fade-in {
            transform: translateY(20px);
        }

        .ig-slide-up {
            transform: translateY(40px);
        }

        .ig-fade-in.is-visible, .ig-slide-up.is-visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* Section Spacing */
        .ig-section {
            padding: 80px 0;
        }
        
        @media (max-width: 768px) {
            .ig-section {
                padding: 60px 0;
            }
        }
        
        /* Logo Instagram Style */
        .ig-logo {
            font-weight: 800;
            font-size: 24px;
            background: var(--ig-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.02em;
        }
        
        /* Stats Instagram Style */
        .ig-stats {
            display: flex;
            gap: 32px;
            justify-content: center;
            margin: 40px 0;
        }
        
        .ig-stat {
            text-align: center;
        }
        
        .ig-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--ig-primary);
            display: block;
        }
        
        .ig-stat-label {
            font-size: 12px;
            color: var(--ig-tertiary);
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }