/* ========== VARIABLES CSS ========== */
        :root {
            --bleu-tech: #207fae;
            --bleu-tech2: #175d80;
            --bleu-clair: #7ca3d2;
            --vert-eco: #10b981;
            --vert-clair: #34d399;
            --noir: #0f172a;
            --gris-fonce: #1e293b;
            --gris-moyen: #475569;
            --gris-clair: #f8fafc;
            --gris-clairP: #c3c6c9;
            --blanc: #ffffff;
            --ombre-legere: 0 1px 3px rgba(0, 0, 0, 0.12);
            --ombre: 0 4px 12px rgba(0, 0, 0, 0.15);
            --ombre-forte: 0 10px 30px rgba(0, 0, 0, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
       }

        /* ========== RESET & BASE ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        
        @font-face {
        font-family: 'Quicksand';
        src: url('../fonts/quicksand-v37-latin-regular.woff2') format('woff2');
        font-weight: 400;
        font-style: normal;
        }

        body {
            font-family: 'Quicksand', sans-serif;
            line-height: 1.6;
            color: var(--gris-fonce);
            background-color: var(--blanc);
        }

        /* ========== HEADER ========== */
        header {
            background-color: var(--gris-clair);
            color: var(--gris-fonce);
            padding: 1.2rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--ombre);
        }

        .header-container {
            width: 100%;
            margin: 0;
            padding: 0 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--gris-fonce);
        }

        .logo span {
            color: var(--bleu-tech);
        }

        /* Menu burger mobile */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--blanc);
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }

        nav ul {
            display: flex;
            gap: 0.5rem;
            list-style: none;
        }

        nav a {
            color: var(--gris-fonce);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            padding: 0.6rem 1.2rem;
            border-radius: 6px;
        }

        nav a:hover {
            color: var(--blanc);
            background-color: var(--gris-fonce);
        }

        /* ========== HERO SECTION ========== */
        .hero {
           
            background-image: url('../img/fond5b.webp'); /* plus leger en */
            display: flex;
            background-size: cover; /* ou cover , contain */
            background-position: center;
            background-repeat: no-repeat;
            color: var(--noir);
            text-align: center;
            padding: 7rem 2rem 6rem;
            position: relative;
            overflow: hidden;
        }

        /* Overlay sombre optionnel pour améliorer la lisibilité du texte */
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(106, 106, 108, 0.1); /* Overlay semi-transparent - ajustez l'opacité si besoin */
            pointer-events: none;
        }

       .hero-content {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-block;
            background-color: rgba(119, 139, 173, 0.15);
            color: var(--gris-fonce);
            padding: 0.5rem 1.5rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
            border: 1px solid rgba(59, 130, 246, 0.3);
        }

        .hero h1 {
            font-size: 3.2rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2.5rem;
            color: var(--noir);
            font-weight: 500;
            line-height: 1.7;
        }

        .cta-buttons {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .cta-button {
            display: inline-block;
            padding: 1rem 2.5rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1rem;
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .cta-primary {
            background-color: var(--bleu-tech);
            color: var(--blanc);
            box-shadow: var(--ombre);
        }

        .cta-primary:hover {
            background-color: var(--bleu-clair);
            transform: translateY(-2px);
            box-shadow: var(--ombre-forte);
        }

        .cta-secondary {
            background-color: transparent;
            color: var(--blanc);
            border-color: var(--gris-moyen);
        }

        .cta-secondary:hover {
            background-color: var(--noir);
            border-color: var(--bleu-tech);
            transform: translateY(-2px);
        }

        /* ========== SECTIONS ========== */
        section {
            padding: 5rem 2rem;
            width: 100%;
            margin: 0;
        }

        .section-dark {
            background-color: var(--gris-clair);
        }

        section h2 {
            text-align: center;
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: var(--noir);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.1rem;
            color: var(--gris-moyen);
            margin-bottom: 3.5rem;
            font-weight: 500;
        }

        .section-decoration {
            width: 60px;
            height: 3px;
            background-color: var(--bleu-tech);
            margin: 0 auto 3rem;
        }

        /* ========== CHIFFRES CLÉS ========== */
        .chiffres-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            width: 100%;
            margin: 0;
            padding: 0 2rem;
        }

        .chiffre-item {
            text-align: center;
            padding: 2rem 1rem;
        }

        .chiffre-nombre {
            font-size: 3rem;
            font-weight: 700;
            color: var(--bleu-tech);
            margin-bottom: 0.5rem;
        }

        .chiffre-label {
            font-size: 1rem;
            color: var(--gris-moyen);
            font-weight: 600;
        }

        /* ========== BUREAU D'ÉTUDES ========== */
        .bureau-intro {
            text-align: center;
            width: 100%;
            margin: 0 auto 4rem;
            padding: 0 2rem;
            font-size: 1.1rem;
            line-height: 1.8;
            color: var(--gris-fonce);
            font-weight: 500;
        }

        .expertise-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
        }

        .expertise-card {
            background: var(--blanc);
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--ombre);
            transition: var(--transition);
            border-top: 4px solid var(--bleu-tech);
        }

        .expertise-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--ombre-forte);
        }

        .expertise-icon {
            font-size: 2.8rem;
            margin-bottom: 1rem;
        }

        .expertise-card h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--noir);
        }

        .expertise-card > p {
            color: var(--gris-moyen);
            margin-bottom: 1.5rem;
            font-weight: 500;
        }

        .expertise-card ul {
            list-style: none;
        }

        .expertise-card li {
            padding: 0.6rem 0;
            padding-left: 1.8rem;
            position: relative;
            font-weight: 500;
            color: var(--gris-fonce);
        }

        .expertise-card li:before {
            content: "→";
            position: absolute;
            left: 0;
            color: var(--bleu-tech);
            font-weight: 700;
        }

        /* ========== PROCESSUS ========== */
        .processus-timeline {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.5rem;
            width: 100%;
            margin: 0;
        }

        .processus-step {
            text-align: center;
            padding: 2rem 1.5rem;
            background: var(--blanc);
            border-radius: 12px;
            box-shadow: var(--ombre-legere);
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .processus-step:hover {
            border-color: var(--bleu-tech);
            box-shadow: var(--ombre);
            transform: translateY(-3px);
        }

        .step-number {
            width: 50px;
            height: 50px;
            background-color: var(--noir);
            color: var(--blanc);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 auto 1rem;
        }

        .processus-step:hover .step-number {
            background-color: var(--bleu-tech);
        }

        .processus-step h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--noir);
        }

        .processus-step p {
            font-size: 0.95rem;
            color: var(--gris-moyen);
            font-weight: 500;
        }

        /* ========== DÉVELOPPEMENT DURABLE ========== */
        .durable {
            background-color: var(--blanc);
        }

        .durable h2 {
            color: var(--vert-eco);
        }

        .durable .section-decoration {
            background-color: var(--vert-eco);
        }

        .durable-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
        }

        .durable-item {
            background: var(--gris-clair);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: var(--ombre-legere);
            transition: var(--transition);
            border-left: 4px solid var(--vert-eco);
        }

        .durable-item:hover {
            box-shadow: var(--ombre);
            transform: translateX(5px);
        }

        .durable-item h3 {
            color: var(--vert-eco);
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .durable-item p {
            font-weight: 500;
            color: var(--gris-fonce);
            line-height: 1.7;
        }

        /* ========== RÉALISATIONS ========== */
        .realisations-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
        }

        .realisation-card {
            background: var(--blanc);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--ombre);
            transition: var(--transition);
            border: 1px solid var(--gris-clair);
        }

        .realisation-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--ombre-forte);
            border-color: var(--bleu-tech);
        }

        .realisation-image {
            width: 100%;
            height: 200px;
            background-color: var(--gris-fonce);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--blanc);
            font-size: 3.5rem;
        }

        .realisation-content {
            padding: 1.8rem;
        }

        .realisation-content h3 {
            margin-bottom: 0.8rem;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--noir);
        }

        .realisation-content p {
            font-weight: 500;
            color: var(--gris-moyen);
            line-height: 1.6;
            margin-bottom: 1rem;
        }

        .realisation-tags {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        .realisation-tag {
            display: inline-block;
            background-color: var(--gris-clair);
            color: var(--bleu-tech);
            padding: 0.3rem 0.9rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            border: 1px solid rgba(59, 130, 246, 0.2);
        }

        /* ========== TÉMOIGNAGES ========== */
        .temoignages-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
            width: 100%;
            margin: 0;
        }

        .temoignage-card {
            background: var(--blanc);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: var(--ombre);
            position: relative;
            border-left: 4px solid var(--bleu-tech);
        }

        .temoignage-quote {
            font-size: 2.5rem;
            color: var(--bleu-tech);
            opacity: 0.3;
            line-height: 1;
            margin-bottom: 1rem;
        }

        .temoignage-text {
            font-style: italic;
            color: var(--gris-fonce);
            margin-bottom: 1.5rem;
            line-height: 1.7;
            font-weight: 500;
        }

        .temoignage-auteur {
            font-weight: 700;
            color: var(--noir);
            margin-bottom: 0.3rem;
        }

        .temoignage-fonction {
            font-size: 0.9rem;
            color: var(--gris-moyen);
            font-weight: 500;
        }

        /* ========== CLIENTS ========== */
        .clients-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 2rem;
            width: 100%;
            margin: 0;
            align-items: center;
        }

        .client-logo {
            background: var(--blanc);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: var(--ombre-legere);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100px;
            transition: var(--transition);
            font-weight: 600;
            color: var(--gris-moyen);
            text-align: center;
        }

        .client-logo:hover {
            box-shadow: var(--ombre);
            transform: translateY(-3px);
        }

        /* ========== CTA FINAL ========== */
        .cta-final {
            background-color: var(--bleu-tech);
            color: var(--blanc);
            text-align: center;
            padding: 5rem 2rem;
        }

        .cta-final h2 {
            color: var(--blanc);
            margin-bottom: 1rem;
        }

        .cta-final p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }

        .cta-final .cta-button {
            background-color: var(--blanc);
            color: var(--bleu-tech);
            border: 2px solid var(--blanc);
        }

        .cta-final .cta-button:hover {
            background-color: transparent;
            color: var(--blanc);
        }

        /* ========== FOOTER ========== */
        footer {
            background-color: var(--noir);
            color: var(--gris-clair);
            padding: 3rem 2rem 1.5rem;
        }

        .footer-container {
            width: 100%;
            margin: 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2rem;
            padding: 0 2rem;
        }

        .footer-section h3 {
            color: var(--blanc);
            font-weight: 700;
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }

        .footer-section p {
            font-weight: 500;
            margin-bottom: 0.6rem;
            line-height: 1.7;
        }

        .footer-section a {
            color: var(--gris-clair);
            text-decoration: none;
            transition: var(--transition);
            font-weight: 500;
            display: inline-block;
        }

        .footer-section a:hover {
            color: var(--bleu-clair);
            transform: translateX(3px);
        }

        .footer-badges {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            margin-top: 1rem;
        }

        .footer-badge {
            background-color: var(--gris-fonce);
            color: var(--gris-clair);
            padding: 0.5rem 1rem;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 600;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid var(--gris-fonce);
            font-weight: 500;
            font-size: 0.9rem;
        }

        /* ========== RESPONSIVE MOBILE ========== */
        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }

            nav {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--gris-fonce);
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s ease;
                box-shadow: var(--ombre);
            }

            nav.active {
                max-height: 400px;
            }

            nav ul {
                flex-direction: column;
                padding: 1rem 0;
                gap: 0;
            }

            nav li {
                border-bottom: 1px solid var(--noir);
            }

            nav a {
                display: block;
                padding: 1rem 2rem;
            }

            .hero {
                padding: 5rem 1.5rem 4rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .hero p {
                font-size: 1rem;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
            }

            .cta-button {
                text-align: center;
            }

            section {
                padding: 3.5rem 1.5rem;
            }

            section h2 {
                font-size: 1.9rem;
            }

            .section-subtitle {
                font-size: 1rem;
            }

            .chiffre-nombre {
                font-size: 2.5rem;
            }

            .expertise-grid,
            .processus-timeline,
            .durable-grid,
            .realisations-grid,
            .temoignages-grid {
                grid-template-columns: 1fr;
            }

            .clients-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }