/* --- VARIABLES & RESET --- */
        :root {
            --bg-dark: #0f1115; /* Noir bleuté profond */
            --bg-card: #1a1d24;
            --text-white: #ffffff;
            --text-gray: #9ca3af;
            --accent: #006aeb; /* Un violet/indigo 'Business Tech' */
            --accent-glow: rgba(99, 102, 241, 0.2);
            --border: #2d313a;
        }

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

        body {
            background-color: var(--bg-dark);
            color: var(--text-white);
            font-family: 'Segoe UI', Helvetica, Arial, sans-serif;
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* --- NAVIGATION --- */
        nav {
            padding: 20px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--border);
            background: rgba(15, 17, 21, 0.95);
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .back-link {
            text-decoration: none;
            color: var(--text-gray);
            font-size: 0.9rem;
            font-weight: 500;
            transition: 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .back-link:hover { color: var(--text-white); }
        
        .brand { font-weight: 700; letter-spacing: 1px; }

        /* --- HEADER --- */
        header {
            max-width: 900px;
            margin: 80px auto 60px;
            padding: 0 20px;
            text-align: center;
        }

        .date-badge {
            display: inline-block;
            background: var(--bg-card);
            border: 1px solid var(--border);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--accent);
            margin-bottom: 20px;
            font-weight: 600;
        }

        h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            line-height: 1.1;
        }

        p.intro {
            font-size: 1.2rem;
            color: var(--text-gray);
            max-width: 700px;
            margin: 0 auto;
        }

        /* --- BUSINESS SKILLS SECTION --- */
        .business-skills {
            max-width: 1100px;
            margin: 0 auto 80px;
            padding: 0 20px;
        }

        .section-title {
            font-size: 1.5rem;
            margin-bottom: 30px;
            border-left: 4px solid var(--accent);
            padding-left: 15px;
        }

        .skills-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .skill-card {
            background: var(--bg-card);
            padding: 30px;
            border-radius: 8px;
            border: 1px solid var(--border);
            transition: 0.3s;
        }

        .skill-card:hover {
            border-color: var(--accent);
            background: #20232b;
        }

        .icon { font-size: 1.8rem; margin-bottom: 15px; display: block; }

        .skill-card h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--text-white); }
        
        .skill-card p { font-size: 0.9rem; color: var(--text-gray); }

        /* --- PORTFOLIO GALLERY --- */
        .gallery-section {
            background: #13151a; /* Légèrement plus clair que le fond */
            padding: 80px 20px;
            border-top: 1px solid var(--border);
        }

        .gallery-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .gallery-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }

        .project-item {
            background: var(--bg-card);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border);
            transition: transform 0.3s ease;
        }

        .project-item:hover { transform: translateY(-5px); }

        .img-placeholder {
            width: 100%;
            aspect-ratio: 16/9;
            background: #252830;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #4b5563;
            font-weight: 700;
            font-size: 1.5rem;
            border-bottom: 1px solid var(--border);
        }
        
        .img-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .project-info { padding: 20px; }
        .project-title { font-weight: 700; margin-bottom: 5px; }
        .project-desc { font-size: 0.85rem; color: var(--text-gray); }



        /* --- FOOTER --- */
        footer {
            text-align: center;
            padding: 50px 20px;
            color: var(--text-gray);
            font-size: 0.9rem;
            border-top: 1px solid var(--border);
        }

        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            .gallery-grid { grid-template-columns: 1fr; }
        }