diff --git a/articles/documentation-index 2.html b/articles/documentation-index 2.html
index 569a078..7e12c50 100644
--- a/articles/documentation-index 2.html	
+++ b/articles/documentation-index 2.html	
@@ -5,499 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Index Documentation Technique & Biologie | NextGN Formation</title>
     <link href="https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap" rel="stylesheet">
-    <style>
-        :root {
-            --teal: #0F6E56;
-            --teal-mid: #1D9E75;
-            --teal-light: #E1F5EE;
-            --teal-dark: #085041;
-            --amber: #BA7517;
-            --amber-mid: #D4921A;
-            --amber-light: #FAEEDA;
-            --amber-dark: #633806;
-            --coral: #993C1D;
-            --coral-mid: #D85A30;
-            --coral-light: #FAECE7;
-            --purple: #534AB7;
-            --purple-light: #EEEDFE;
-            --purple-dark: #3C3489;
-            --blue: #185FA5;
-            --blue-light: #E6F1FB;
-            --bg: #F7F6F2;
-            --white: #FFFFFF;
-            --text: #1a1a18;
-            --text-muted: #6b6a65;
-            --border: rgba(0,0,0,0.1);
-        }
-
-        * {
-            margin: 0;
-            padding: 0;
-            box-sizing: border-box;
-        }
-
-        html, body {
-            height: 100%;
-        }
-
-        body {
-            font-family: 'DM Sans', sans-serif;
-            background: var(--bg);
-            color: var(--text);
-            line-height: 1.6;
-            overflow-x: hidden;
-        }
-
-        /* HEADER FIXE */
-        nav.nav-header {
-            position: fixed;
-            top: 0;
-            left: 0;
-            right: 0;
-            height: 70px;
-            background: rgba(255, 255, 255, 0.95);
-            backdrop-filter: blur(10px);
-            border-bottom: 1px solid var(--border);
-            z-index: 1000;
-            display: flex;
-            justify-content: space-between;
-            align-items: center;
-            padding: 0 40px;
-            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
-        }
-
-        .header-logo {
-            font-family: 'Syne', sans-serif;
-            font-size: 18px;
-            font-weight: 800;
-            letter-spacing: 0.02em;
-            background: linear-gradient(135deg, var(--amber) 0%, var(--coral-mid) 100%);
-            -webkit-background-clip: text;
-            -webkit-text-fill-color: transparent;
-            background-clip: text;
-            text-decoration: none;
-            display: flex;
-            align-items: center;
-            gap: 8px;
-        }
-
-        .header-logo span {
-            color: var(--amber);
-        }
-
-        .header-nav {
-            display: flex;
-            gap: 40px;
-            align-items: center;
-        }
-
-        .header-nav a {
-            font-family: 'Syne', sans-serif;
-            font-size: 12px;
-            font-weight: 700;
-            letter-spacing: 0.08em;
-            text-transform: uppercase;
-            color: var(--text);
-            text-decoration: none;
-            transition: all 0.3s ease;
-            position: relative;
-        }
-
-        .header-nav a:hover {
-            color: var(--amber-mid);
-        }
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-        .header-nav a::after {
-            content: '';
-            position: absolute;
-            bottom: -4px;
-            left: 0;
-            width: 0;
-            height: 2px;
-            background: var(--amber-mid);
-            transition: width 0.3s ease;
-        }
-
-        .header-nav a:hover::after {
-            width: 100%;
-        }
-
-        /* PROGRESS BAR */
-        .progress {
-            position: fixed;
-            top: 70px;
-            left: 0;
-            right: 0;
-            height: 3px;
-            background: var(--border);
-            z-index: 999;
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-
-        .progress-bar {
-            height: 100%;
-            background: var(--amber-mid);
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-            transition: width 0.3s ease;
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-
-        /* MAIN CONTENT */
-        main {
-            padding-top: 70px;
-            min-height: calc(100vh - 70px);
-        }
-
-        /* HERO SECTION */
-        .hero {
-            position: relative;
-            padding: 80px 40px 100px;
-            background: linear-gradient(135deg, rgba(186, 117, 23, 0.05) 0%, rgba(212, 146, 26, 0.03) 100%);
-            overflow: hidden;
-        }
-
-        .hero::before {
-            content: '';
-            position: absolute;
-            top: -50%;
-            right: -10%;
-            width: 600px;
-            height: 600px;
-            background: radial-gradient(circle, var(--amber-light) 0%, transparent 70%);
-            opacity: 0.4;
-            border-radius: 50%;
-            animation: float 20s ease-in-out infinite;
-        }
-
-        .hero::after {
-            content: '';
-            position: absolute;
-            bottom: -30%;
-            left: -5%;
-            width: 400px;
-            height: 400px;
-            background: radial-gradient(circle, var(--amber-light) 0%, transparent 70%);
-            opacity: 0.3;
-            border-radius: 50%;
-            animation: float-reverse 25s ease-in-out infinite;
-        }
-
-        @keyframes float {
-            0%, 100% { transform: translateY(0px); }
-            50% { transform: translateY(-30px); }
-        }
-
-        @keyframes float-reverse {
-            0%, 100% { transform: translateY(0px); }
-            50% { transform: translateY(30px); }
-        }
-
-        .hero-content {
-            max-width: 900px;
-            margin: 0 auto;
-            position: relative;
-            z-index: 1;
-            animation: slideUp 0.8s ease forwards;
-            opacity: 0;
-        }
-
-        @keyframes slideUp {
-            from {
-                opacity: 0;
-                transform: translateY(30px);
-            }
-            to {
-                opacity: 1;
-                transform: translateY(0);
-            }
-        }
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-        h1 {
-            font-family: 'Syne', sans-serif;
-            font-size: 56px;
-            font-weight: 800;
-            line-height: 1.1;
-            margin-bottom: 20px;
-            letter-spacing: -1px;
-            color: var(--text);
-        }
-
-        .hero-subtitle {
-            font-size: 18px;
-            color: var(--text-muted);
-            max-width: 700px;
-            margin: 0 auto 50px;
-            line-height: 1.7;
-        }
-
-        /* SEARCH BAR */
-        .search-container {
-            max-width: 700px;
-            margin: 0 auto 40px;
-            position: relative;
-            z-index: 1;
-        }
-
-        .search-bar {
-            display: flex;
-            align-items: center;
-            background: var(--white);
-            border: 2px solid var(--amber-light);
-            border-radius: 12px;
-            padding: 15px 20px;
-            transition: all 0.3s ease;
-            box-shadow: 0 4px 12px rgba(186, 117, 23, 0.1);
-        }
-
-        .search-bar:focus-within {
-            border-color: var(--amber-mid);
-            box-shadow: 0 8px 24px rgba(186, 117, 23, 0.2);
-        }
-
-        .search-bar input {
-            flex: 1;
-            border: none;
-            outline: none;
-            font-family: 'DM Sans', sans-serif;
-            font-size: 16px;
-            color: var(--text);
-            background: transparent;
-        }
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-        .search-bar input::placeholder {
-            color: var(--text-muted);
-        }
-
-        .search-icon {
-            color: var(--amber-mid);
-            font-size: 20px;
-            margin-left: 10px;
-        }
-
-        /* DOCUMENTATION GRID */
-        .documentation-container {
-            max-width: 1200px;
-            margin: 0 auto;
-            padding: 0 40px 80px;
-        }
-
-        .section-header {
-            margin-bottom: 50px;
-            animation: fadeIn 0.6s ease-out 0.1s both;
-        }
-
-        .section-header h2 {
-            font-family: 'Syne', sans-serif;
-            font-size: 36px;
-            font-weight: 800;
-            margin-bottom: 15px;
-            color: var(--text);
-            padding-bottom: 15px;
-            border-bottom: 3px solid var(--amber-mid);
-            display: inline-block;
-        }
-
-        .section-header p {
-            font-size: 16px;
-            color: var(--text-muted);
-            line-height: 1.7;
-            margin-top: 15px;
-        }
-
-        /* DOC CARDS GRID */
-        .doc-grid {
-            display: grid;
-            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
-            gap: 30px;
-            margin-bottom: 60px;
-        }
-
-        .doc-card {
-            background: var(--white);
-            border-radius: 12px;
-            overflow: hidden;
-            transition: all 0.3s ease;
-            border: 1px solid var(--border);
-            animation: fadeIn 0.6s ease-out forwards;
-            opacity: 0;
-        }
-
-        .doc-card:nth-child(1) { animation-delay: 0.1s; }
-        .doc-card:nth-child(2) { animation-delay: 0.2s; }
-        .doc-card:nth-child(3) { animation-delay: 0.3s; }
-        .doc-card:nth-child(n+4) { animation-delay: 0.4s; }
-
-        @keyframes fadeIn {
-            from {
-                opacity: 0;
-                transform: translateY(10px);
-            }
-            to {
-                opacity: 1;
-                transform: translateY(0);
-            }
-        }
-
-        .doc-card:hover {
-            transform: translateY(-8px);
-            box-shadow: 0 16px 32px rgba(186, 117, 23, 0.15);
-            border-color: var(--amber-light);
-        }
-
-        .doc-card.hidden {
-            display: none;
-        }
-
-        .doc-header {
-            padding: 25px;
-            background: linear-gradient(135deg, var(--amber-light) 0%, rgba(212, 146, 26, 0.05) 100%);
-            border-bottom: 2px solid var(--amber-mid);
-        }
-
-        .doc-icon {
-            font-size: 32px;
-            margin-bottom: 12px;
-        }
-
-        .doc-title {
-            font-family: 'Syne', sans-serif;
-            font-size: 18px;
-            font-weight: 700;
-            color: var(--text);
-            margin-bottom: 8px;
-            line-height: 1.4;
-        }
-
-        .doc-subtitle {
-            font-size: 13px;
-            color: var(--amber-mid);
-            font-weight: 600;
-            text-transform: uppercase;
-            letter-spacing: 0.05em;
-        }
-
-        .doc-body {
-            padding: 25px;
-        }
-
-        .doc-description {
-            font-size: 15px;
-            color: var(--text-muted);
-            line-height: 1.7;
-            margin-bottom: 15px;
-        }
-
-        .doc-tags {
-            display: flex;
-            flex-wrap: wrap;
-            gap: 8px;
-            margin-bottom: 15px;
-        }
-
-        .doc-tag {
-            display: inline-block;
-            background: var(--amber-light);
-            color: var(--amber-dark);
-            padding: 6px 12px;
-            border-radius: 20px;
-            font-size: 12px;
-            font-weight: 600;
-            text-transform: uppercase;
-            letter-spacing: 0.04em;
-        }
-
-        .doc-link {
-            display: inline-block;
-            font-family: 'Syne', sans-serif;
-            font-size: 13px;
-            font-weight: 700;
-            letter-spacing: 0.08em;
-            text-transform: uppercase;
-            color: var(--amber-mid);
-            text-decoration: none;
-            padding: 10px 0;
-            transition: all 0.3s ease;
-            border-bottom: 2px solid transparent;
-        }
-
-        .doc-link:hover {
-            border-bottom-color: var(--amber-mid);
-            transform: translateX(4px);
-        }
-
-        /* NO RESULTS */
-        .no-results {
-            text-align: center;
-            padding: 60px 20px;
-            grid-column: 1 / -1;
-        }
-
-        .no-results-icon {
-            font-size: 48px;
-            margin-bottom: 20px;
-            opacity: 0.5;
-        }
-
-        .no-results h3 {
-            font-family: 'Syne', sans-serif;
-            font-size: 24px;
-            font-weight: 700;
-            color: var(--text);
-            margin-bottom: 10px;
-        }
-
-        .no-results p {
-            color: var(--text-muted);
-            font-size: 16px;
-        }
-
-        /* FOOTER */
-        footer {
-            background: var(--text);
-            color: var(--white);
-            padding: 40px;
-            text-align: center;
-            font-size: 13px;
-        }
-
-        footer p:first-child {
-            margin-bottom: 10px;
-        }
-
-        footer p:last-child {
-            opacity: 0.6;
-            margin-top: 10px;
-        }
-
-        /* RESPONSIVE */
-        @media (max-width: 768px) {
-            .nav-header {
-                padding: 0 20px;
-            }
-
-            .header-nav {
-                gap: 20px;
-            }
-
-            .hero {
-                padding: 60px 20px 80px;
-            }
-
-            h1 {
-                font-size: 36px;
-            }
-
-            .documentation-container {
-                padding: 0 20px 60px;
-            }
-
-            .doc-grid {
-                grid-template-columns: 1fr;
-            }
-
-            .section-header h2 {
-                font-size: 24px;
-            }
-        }
-    </style>
+    <link rel="stylesheet" href="../header-style.css"/>
 </head>
 <body>
     <div class="progress">
diff --git a/articles/documentation-index 3.html b/articles/documentation-index 3.html
index c6cc25f..d76895f 100644
--- a/articles/documentation-index 3.html	
+++ b/articles/documentation-index 3.html	
@@ -5,499 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Index Documentation Technique & Biologie | NextGN Formation</title>
     <link href="https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap" rel="stylesheet">
-    <style>
-        :root {
-            --amber: #BA7517;
-            --amber-mid: #BA7517;
-            --amber-light: #FAEEDA;
-            --amber-dark: #633806;
-            --amber: #BA7517;
-            --amber-mid: #D4921A;
-            --amber-light: #FAEEDA;
-            --amber-dark: #633806;
-            --coral: #993C1D;
-            --coral-mid: #D85A30;
-            --coral-light: #FAECE7;
-            --purple: #BA7517;
-            --purple-light: #FAEEDA;
-            --purple-dark: #633806;
-            --blue: #BA7517;
-            --blue-light: #FAEEDA;
-            --bg: #F7F6F2;
-            --white: #FFFFFF;
-            --text: #1a1a18;
-            --text-muted: #6b6a65;
-            --border: rgba(0,0,0,0.1);
-        }
-
-        * {
-            margin: 0;
-            padding: 0;
-            box-sizing: border-box;
-        }
-
-        html, body {
-            height: 100%;
-        }
-
-        body {
-            font-family: 'DM Sans', sans-serif;
-            background: var(--bg);
-            color: var(--text);
-            line-height: 1.6;
-            overflow-x: hidden;
-        }
-
-        /* HEADER FIXE */
-        nav.nav-header {
-            position: fixed;
-            top: 0;
-            left: 0;
-            right: 0;
-            height: 70px;
-            background: rgba(250, 238, 218, 0.98);
-            backdrop-filter: blur(10px);
-            border-bottom: 2px solid var(--amber);
-            z-index: 1000;
-            display: flex;
-            justify-content: space-between;
-            align-items: center;
-            padding: 0 40px;
-            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
-        }
-
-        .header-logo {
-            font-family: 'Syne', sans-serif;
-            font-size: 18px;
-            font-weight: 800;
-            letter-spacing: 0.02em;
-            background: linear-gradient(135deg, var(--amber) 0%, var(--coral-mid) 100%);
-            -webkit-background-clip: text;
-            -webkit-text-fill-color: transparent;
-            background-clip: text;
-            text-decoration: none;
-            display: flex;
-            align-items: center;
-            gap: 8px;
-        }
-
-        .header-logo span {
-            color: var(--amber);
-        }
-
-        .header-nav {
-            display: flex;
-            gap: 40px;
-            align-items: center;
-        }
-
-        .header-nav a {
-            font-family: 'Syne', sans-serif;
-            font-size: 12px;
-            font-weight: 700;
-            letter-spacing: 0.08em;
-            text-transform: uppercase;
-            color: var(--text);
-            text-decoration: none;
-            transition: all 0.3s ease;
-            position: relative;
-        }
-
-        .header-nav a:hover {
-            color: var(--amber-mid);
-        }
-
-        .header-nav a::after {
-            content: '';
-            position: absolute;
-            bottom: -4px;
-            left: 0;
-            width: 0;
-            height: 2px;
-            background: var(--amber-mid);
-            transition: width 0.3s ease;
-        }
-
-        .header-nav a:hover::after {
-            width: 100%;
-        }
-
-        /* PROGRESS BAR */
-        .progress {
-            position: fixed;
-            top: 70px;
-            left: 0;
-            right: 0;
-            height: 3px;
-            background: var(--border);
-            z-index: 999;
-        }
-
-        .progress-bar {
-            height: 100%;
-            background: var(--amber-mid);
-            width: 0%;
-            transition: width 0.3s ease;
-        }
-
-        /* MAIN CONTENT */
-        main {
-            padding-top: 70px;
-            min-height: calc(100vh - 70px);
-        }
-
-        /* HERO SECTION */
-        .hero {
-            position: relative;
-            padding: 80px 40px 100px;
-            background: linear-gradient(135deg, rgba(186, 117, 23, 0.05) 0%, rgba(212, 146, 26, 0.03) 100%);
-            overflow: hidden;
-        }
-
-        .hero::before {
-            content: '';
-            position: absolute;
-            top: -50%;
-            right: -10%;
-            width: 600px;
-            height: 600px;
-            background: radial-gradient(circle, var(--amber-light) 0%, transparent 70%);
-            opacity: 0.4;
-            border-radius: 50%;
-            animation: float 20s ease-in-out infinite;
-        }
-
-        .hero::after {
-            content: '';
-            position: absolute;
-            bottom: -30%;
-            left: -5%;
-            width: 400px;
-            height: 400px;
-            background: radial-gradient(circle, var(--amber-light) 0%, transparent 70%);
-            opacity: 0.3;
-            border-radius: 50%;
-            animation: float-reverse 25s ease-in-out infinite;
-        }
-
-        @keyframes float {
-            0%, 100% { transform: translateY(0px); }
-            50% { transform: translateY(-30px); }
-        }
-
-        @keyframes float-reverse {
-            0%, 100% { transform: translateY(0px); }
-            50% { transform: translateY(30px); }
-        }
-
-        .hero-content {
-            max-width: 900px;
-            margin: 0 auto;
-            position: relative;
-            z-index: 1;
-            animation: slideUp 0.8s ease forwards;
-            opacity: 0;
-        }
-
-        @keyframes slideUp {
-            from {
-                opacity: 0;
-                transform: translateY(30px);
-            }
-            to {
-                opacity: 1;
-                transform: translateY(0);
-            }
-        }
-
-        h1 {
-            font-family: 'Syne', sans-serif;
-            font-size: 56px;
-            font-weight: 800;
-            line-height: 1.1;
-            margin-bottom: 20px;
-            letter-spacing: -1px;
-            color: var(--text);
-        }
-
-        .hero-subtitle {
-            font-size: 18px;
-            color: var(--text-muted);
-            max-width: 700px;
-            margin: 0 auto 50px;
-            line-height: 1.7;
-        }
-
-        /* SEARCH BAR */
-        .search-container {
-            max-width: 700px;
-            margin: 0 auto 40px;
-            position: relative;
-            z-index: 1;
-        }
-
-        .search-bar {
-            display: flex;
-            align-items: center;
-            background: var(--amber-light);
-            border: 2px solid var(--amber-light);
-            border-radius: 12px;
-            padding: 15px 20px;
-            transition: all 0.3s ease;
-            box-shadow: 0 4px 12px rgba(186, 117, 23, 0.1);
-        }
-
-        .search-bar:focus-within {
-            border-color: var(--amber-mid);
-            box-shadow: 0 8px 24px rgba(186, 117, 23, 0.2);
-        }
-
-        .search-bar input {
-            flex: 1;
-            border: none;
-            outline: none;
-            font-family: 'DM Sans', sans-serif;
-            font-size: 16px;
-            color: var(--text);
-            background: transparent;
-        }
-
-        .search-bar input::placeholder {
-            color: var(--text-muted);
-        }
-
-        .search-icon {
-            color: var(--amber-mid);
-            font-size: 20px;
-            margin-left: 10px;
-        }
-
-        /* DOCUMENTATION GRID */
-        .documentation-container {
-            max-width: 1200px;
-            margin: 0 auto;
-            padding: 0 40px 80px;
-        }
-
-        .section-header {
-            margin-bottom: 50px;
-            animation: fadeIn 0.6s ease-out 0.1s both;
-        }
-
-        .section-header h2 {
-            font-family: 'Syne', sans-serif;
-            font-size: 36px;
-            font-weight: 800;
-            margin-bottom: 15px;
-            color: var(--text);
-            padding-bottom: 15px;
-            border-bottom: 3px solid var(--amber-mid);
-            display: inline-block;
-        }
-
-        .section-header p {
-            font-size: 16px;
-            color: var(--text-muted);
-            line-height: 1.7;
-            margin-top: 15px;
-        }
-
-        /* DOC CARDS GRID */
-        .doc-grid {
-            display: grid;
-            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
-            gap: 30px;
-            margin-bottom: 60px;
-        }
-
-        .doc-card {
-            background: var(--amber-light);
-            border-radius: 12px;
-            overflow: hidden;
-            transition: all 0.3s ease;
-            border: 1px solid var(--border);
-            animation: fadeIn 0.6s ease-out forwards;
-            opacity: 0;
-        }
-
-        .doc-card:nth-child(1) { animation-delay: 0.1s; }
-        .doc-card:nth-child(2) { animation-delay: 0.2s; }
-        .doc-card:nth-child(3) { animation-delay: 0.3s; }
-        .doc-card:nth-child(n+4) { animation-delay: 0.4s; }
-
-        @keyframes fadeIn {
-            from {
-                opacity: 0;
-                transform: translateY(10px);
-            }
-            to {
-                opacity: 1;
-                transform: translateY(0);
-            }
-        }
-
-        .doc-card:hover {
-            transform: translateY(-8px);
-            box-shadow: 0 16px 32px rgba(186, 117, 23, 0.15);
-            border-color: var(--amber-light);
-        }
-
-        .doc-card.hidden {
-            display: none;
-        }
-
-        .doc-header {
-            padding: 25px;
-            background: linear-gradient(135deg, var(--amber-light) 0%, rgba(212, 146, 26, 0.05) 100%);
-            border-bottom: 2px solid var(--amber-mid);
-        }
-
-        .doc-icon {
-            font-size: 32px;
-            margin-bottom: 12px;
-        }
-
-        .doc-title {
-            font-family: 'Syne', sans-serif;
-            font-size: 18px;
-            font-weight: 700;
-            color: var(--text);
-            margin-bottom: 8px;
-            line-height: 1.4;
-        }
-
-        .doc-subtitle {
-            font-size: 13px;
-            color: var(--amber-mid);
-            font-weight: 600;
-            text-transform: uppercase;
-            letter-spacing: 0.05em;
-        }
-
-        .doc-body {
-            padding: 25px;
-        }
-
-        .doc-description {
-            font-size: 15px;
-            color: var(--text-muted);
-            line-height: 1.7;
-            margin-bottom: 15px;
-        }
-
-        .doc-tags {
-            display: flex;
-            flex-wrap: wrap;
-            gap: 8px;
-            margin-bottom: 15px;
-        }
-
-        .doc-tag {
-            display: inline-block;
-            background: var(--amber-light);
-            color: var(--amber-dark);
-            padding: 6px 12px;
-            border-radius: 20px;
-            font-size: 12px;
-            font-weight: 600;
-            text-transform: uppercase;
-            letter-spacing: 0.04em;
-        }
-
-        .doc-link {
-            display: inline-block;
-            font-family: 'Syne', sans-serif;
-            font-size: 13px;
-            font-weight: 700;
-            letter-spacing: 0.08em;
-            text-transform: uppercase;
-            color: var(--amber-mid);
-            text-decoration: none;
-            padding: 10px 0;
-            transition: all 0.3s ease;
-            border-bottom: 2px solid transparent;
-        }
-
-        .doc-link:hover {
-            border-bottom-color: var(--amber-mid);
-            transform: translateX(4px);
-        }
-
-        /* NO RESULTS */
-        .no-results {
-            text-align: center;
-            padding: 60px 20px;
-            grid-column: 1 / -1;
-        }
-
-        .no-results-icon {
-            font-size: 48px;
-            margin-bottom: 20px;
-            opacity: 0.5;
-        }
-
-        .no-results h3 {
-            font-family: 'Syne', sans-serif;
-            font-size: 24px;
-            font-weight: 700;
-            color: var(--text);
-            margin-bottom: 10px;
-        }
-
-        .no-results p {
-            color: var(--text-muted);
-            font-size: 16px;
-        }
-
-        /* FOOTER */
-        footer {
-            background: var(--text);
-            color: var(--white);
-            padding: 40px;
-            text-align: center;
-            font-size: 13px;
-        }
-
-        footer p:first-child {
-            margin-bottom: 10px;
-        }
-
-        footer p:last-child {
-            opacity: 0.6;
-            margin-top: 10px;
-        }
-
-        /* RESPONSIVE */
-        @media (max-width: 768px) {
-            .nav-header {
-                padding: 0 20px;
-            }
-
-            .header-nav {
-                gap: 20px;
-            }
-
-            .hero {
-                padding: 60px 20px 80px;
-            }
-
-            h1 {
-                font-size: 36px;
-            }
-
-            .documentation-container {
-                padding: 0 20px 60px;
-            }
-
-            .doc-grid {
-                grid-template-columns: 1fr;
-            }
-
-            .section-header h2 {
-                font-size: 24px;
-            }
-        }
-    </style>
+    <link rel="stylesheet" href="../header-style.css"/>
 </head>
 <body>
     <div class="progress">
@@ -505,14 +13,14 @@
     </div>
 
     <nav class="nav-header">
-        <a href="../../index.html" class="header-logo">
+        <a href="../index.html" class="header-logo">
             <span>NextGN</span> Formation
         </a>
-            <a href="../../index.html">Accueil</a>
+            <a href="../index.html">Accueil</a>
         <div class="header-nav">
-            <a href="../../index.html#formations">Exercices</a>
-            <a href="../../index.html#documentation">Documentation</a>
-            <a href="../../index.html#about">À propos</a>
+            <a href="../index.html#formations">Exercices</a>
+            <a href="../index.html#documentation">Documentation</a>
+            <a href="../index.html#about">À propos</a>
         </div>
     </nav>
 
diff --git a/articles/documentation-index.html b/articles/documentation-index.html
index f18d9c5..dcccf5e 100644
--- a/articles/documentation-index.html
+++ b/articles/documentation-index.html
@@ -5,499 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Index Documentation Technique & Biologie | NextGN Formation</title>
     <link href="https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap" rel="stylesheet">
-    <style>
-        :root {
-            --amber: #BA7517;
-            --amber-mid: #BA7517;
-            --amber-light: #FAEEDA;
-            --amber-dark: #633806;
-            --amber: #BA7517;
-            --amber-mid: #D4921A;
-            --amber-light: #FAEEDA;
-            --amber-dark: #633806;
-            --coral: #993C1D;
-            --coral-mid: #D85A30;
-            --coral-light: #FAECE7;
-            --purple: #BA7517;
-            --purple-light: #FAEEDA;
-            --purple-dark: #633806;
-            --blue: #BA7517;
-            --blue-light: #FAEEDA;
-            --bg: #F7F6F2;
-            --white: #FFFFFF;
-            --text: #1a1a18;
-            --text-muted: #6b6a65;
-            --border: rgba(0,0,0,0.1);
-        }
-
-        * {
-            margin: 0;
-            padding: 0;
-            box-sizing: border-box;
-        }
-
-        html, body {
-            height: 100%;
-        }
-
-        body {
-            font-family: 'DM Sans', sans-serif;
-            background: var(--bg);
-            color: var(--text);
-            line-height: 1.6;
-            overflow-x: hidden;
-        }
-
-        /* HEADER FIXE */
-        nav.nav-header {
-            position: fixed;
-            top: 0;
-            left: 0;
-            right: 0;
-            height: 70px;
-            background: rgba(250, 238, 218, 0.98);
-            backdrop-filter: blur(10px);
-            border-bottom: 2px solid var(--amber);
-            z-index: 1000;
-            display: flex;
-            justify-content: space-between;
-            align-items: center;
-            padding: 0 40px;
-            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
-        }
-
-        .header-logo {
-            font-family: 'Syne', sans-serif;
-            font-size: 18px;
-            font-weight: 800;
-            letter-spacing: 0.02em;
-            background: linear-gradient(135deg, var(--amber) 0%, var(--coral-mid) 100%);
-            -webkit-background-clip: text;
-            -webkit-text-fill-color: transparent;
-            background-clip: text;
-            text-decoration: none;
-            display: flex;
-            align-items: center;
-            gap: 8px;
-        }
-
-        .header-logo span {
-            color: var(--amber);
-        }
-
-        .header-nav {
-            display: flex;
-            gap: 40px;
-            align-items: center;
-        }
-
-        .header-nav a {
-            font-family: 'Syne', sans-serif;
-            font-size: 12px;
-            font-weight: 700;
-            letter-spacing: 0.08em;
-            text-transform: uppercase;
-            color: var(--text);
-            text-decoration: none;
-            transition: all 0.3s ease;
-            position: relative;
-        }
-
-        .header-nav a:hover {
-            color: var(--amber-mid);
-        }
-
-        .header-nav a::after {
-            content: '';
-            position: absolute;
-            bottom: -4px;
-            left: 0;
-            width: 0;
-            height: 2px;
-            background: var(--amber-mid);
-            transition: width 0.3s ease;
-        }
-
-        .header-nav a:hover::after {
-            width: 100%;
-        }
-
-        /* PROGRESS BAR */
-        .progress {
-            position: fixed;
-            top: 70px;
-            left: 0;
-            right: 0;
-            height: 3px;
-            background: var(--border);
-            z-index: 999;
-        }
-
-        .progress-bar {
-            height: 100%;
-            background: var(--amber-mid);
-            width: 0%;
-            transition: width 0.3s ease;
-        }
-
-        /* MAIN CONTENT */
-        main {
-            padding-top: 70px;
-            min-height: calc(100vh - 70px);
-        }
-
-        /* HERO SECTION */
-        .hero {
-            position: relative;
-            padding: 80px 40px 100px;
-            background: linear-gradient(135deg, rgba(186, 117, 23, 0.05) 0%, rgba(212, 146, 26, 0.03) 100%);
-            overflow: hidden;
-        }
-
-        .hero::before {
-            content: '';
-            position: absolute;
-            top: -50%;
-            right: -10%;
-            width: 600px;
-            height: 600px;
-            background: radial-gradient(circle, var(--amber-light) 0%, transparent 70%);
-            opacity: 0.4;
-            border-radius: 50%;
-            animation: float 20s ease-in-out infinite;
-        }
-
-        .hero::after {
-            content: '';
-            position: absolute;
-            bottom: -30%;
-            left: -5%;
-            width: 400px;
-            height: 400px;
-            background: radial-gradient(circle, var(--amber-light) 0%, transparent 70%);
-            opacity: 0.3;
-            border-radius: 50%;
-            animation: float-reverse 25s ease-in-out infinite;
-        }
-
-        @keyframes float {
-            0%, 100% { transform: translateY(0px); }
-            50% { transform: translateY(-30px); }
-        }
-
-        @keyframes float-reverse {
-            0%, 100% { transform: translateY(0px); }
-            50% { transform: translateY(30px); }
-        }
-
-        .hero-content {
-            max-width: 900px;
-            margin: 0 auto;
-            position: relative;
-            z-index: 1;
-            animation: slideUp 0.8s ease forwards;
-            opacity: 0;
-        }
-
-        @keyframes slideUp {
-            from {
-                opacity: 0;
-                transform: translateY(30px);
-            }
-            to {
-                opacity: 1;
-                transform: translateY(0);
-            }
-        }
-
-        h1 {
-            font-family: 'Syne', sans-serif;
-            font-size: 56px;
-            font-weight: 800;
-            line-height: 1.1;
-            margin-bottom: 20px;
-            letter-spacing: -1px;
-            color: var(--text);
-        }
-
-        .hero-subtitle {
-            font-size: 18px;
-            color: var(--text-muted);
-            max-width: 700px;
-            margin: 0 auto 50px;
-            line-height: 1.7;
-        }
-
-        /* SEARCH BAR */
-        .search-container {
-            max-width: 700px;
-            margin: 0 auto 40px;
-            position: relative;
-            z-index: 1;
-        }
-
-        .search-bar {
-            display: flex;
-            align-items: center;
-            background: var(--amber-light);
-            border: 2px solid var(--amber-light);
-            border-radius: 12px;
-            padding: 15px 20px;
-            transition: all 0.3s ease;
-            box-shadow: 0 4px 12px rgba(186, 117, 23, 0.1);
-        }
-
-        .search-bar:focus-within {
-            border-color: var(--amber-mid);
-            box-shadow: 0 8px 24px rgba(186, 117, 23, 0.2);
-        }
-
-        .search-bar input {
-            flex: 1;
-            border: none;
-            outline: none;
-            font-family: 'DM Sans', sans-serif;
-            font-size: 16px;
-            color: var(--text);
-            background: transparent;
-        }
-
-        .search-bar input::placeholder {
-            color: var(--text-muted);
-        }
-
-        .search-icon {
-            color: var(--amber-mid);
-            font-size: 20px;
-            margin-left: 10px;
-        }
-
-        /* DOCUMENTATION GRID */
-        .documentation-container {
-            max-width: 1200px;
-            margin: 0 auto;
-            padding: 0 40px 80px;
-        }
-
-        .section-header {
-            margin-bottom: 50px;
-            animation: fadeIn 0.6s ease-out 0.1s both;
-        }
-
-        .section-header h2 {
-            font-family: 'Syne', sans-serif;
-            font-size: 36px;
-            font-weight: 800;
-            margin-bottom: 15px;
-            color: var(--text);
-            padding-bottom: 15px;
-            border-bottom: 3px solid var(--amber-mid);
-            display: inline-block;
-        }
-
-        .section-header p {
-            font-size: 16px;
-            color: var(--text-muted);
-            line-height: 1.7;
-            margin-top: 15px;
-        }
-
-        /* DOC CARDS GRID */
-        .doc-grid {
-            display: grid;
-            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
-            gap: 30px;
-            margin-bottom: 60px;
-        }
-
-        .doc-card {
-            background: var(--amber-light);
-            border-radius: 12px;
-            overflow: hidden;
-            transition: all 0.3s ease;
-            border: 1px solid var(--border);
-            animation: fadeIn 0.6s ease-out forwards;
-            opacity: 0;
-        }
-
-        .doc-card:nth-child(1) { animation-delay: 0.1s; }
-        .doc-card:nth-child(2) { animation-delay: 0.2s; }
-        .doc-card:nth-child(3) { animation-delay: 0.3s; }
-        .doc-card:nth-child(n+4) { animation-delay: 0.4s; }
-
-        @keyframes fadeIn {
-            from {
-                opacity: 0;
-                transform: translateY(10px);
-            }
-            to {
-                opacity: 1;
-                transform: translateY(0);
-            }
-        }
-
-        .doc-card:hover {
-            transform: translateY(-8px);
-            box-shadow: 0 16px 32px rgba(186, 117, 23, 0.15);
-            border-color: var(--amber-light);
-        }
-
-        .doc-card.hidden {
-            display: none;
-        }
-
-        .doc-header {
-            padding: 25px;
-            background: linear-gradient(135deg, var(--amber-light) 0%, rgba(212, 146, 26, 0.05) 100%);
-            border-bottom: 2px solid var(--amber-mid);
-        }
-
-        .doc-icon {
-            font-size: 32px;
-            margin-bottom: 12px;
-        }
-
-        .doc-title {
-            font-family: 'Syne', sans-serif;
-            font-size: 18px;
-            font-weight: 700;
-            color: var(--text);
-            margin-bottom: 8px;
-            line-height: 1.4;
-        }
-
-        .doc-subtitle {
-            font-size: 13px;
-            color: var(--amber-mid);
-            font-weight: 600;
-            text-transform: uppercase;
-            letter-spacing: 0.05em;
-        }
-
-        .doc-body {
-            padding: 25px;
-        }
-
-        .doc-description {
-            font-size: 15px;
-            color: var(--text-muted);
-            line-height: 1.7;
-            margin-bottom: 15px;
-        }
-
-        .doc-tags {
-            display: flex;
-            flex-wrap: wrap;
-            gap: 8px;
-            margin-bottom: 15px;
-        }
-
-        .doc-tag {
-            display: inline-block;
-            background: var(--amber-light);
-            color: var(--amber-dark);
-            padding: 6px 12px;
-            border-radius: 20px;
-            font-size: 12px;
-            font-weight: 600;
-            text-transform: uppercase;
-            letter-spacing: 0.04em;
-        }
-
-        .doc-link {
-            display: inline-block;
-            font-family: 'Syne', sans-serif;
-            font-size: 13px;
-            font-weight: 700;
-            letter-spacing: 0.08em;
-            text-transform: uppercase;
-            color: var(--amber-mid);
-            text-decoration: none;
-            padding: 10px 0;
-            transition: all 0.3s ease;
-            border-bottom: 2px solid transparent;
-        }
-
-        .doc-link:hover {
-            border-bottom-color: var(--amber-mid);
-            transform: translateX(4px);
-        }
-
-        /* NO RESULTS */
-        .no-results {
-            text-align: center;
-            padding: 60px 20px;
-            grid-column: 1 / -1;
-        }
-
-        .no-results-icon {
-            font-size: 48px;
-            margin-bottom: 20px;
-            opacity: 0.5;
-        }
-
-        .no-results h3 {
-            font-family: 'Syne', sans-serif;
-            font-size: 24px;
-            font-weight: 700;
-            color: var(--text);
-            margin-bottom: 10px;
-        }
-
-        .no-results p {
-            color: var(--text-muted);
-            font-size: 16px;
-        }
-
-        /* FOOTER */
-        footer {
-            background: var(--text);
-            color: var(--white);
-            padding: 40px;
-            text-align: center;
-            font-size: 13px;
-        }
-
-        footer p:first-child {
-            margin-bottom: 10px;
-        }
-
-        footer p:last-child {
-            opacity: 0.6;
-            margin-top: 10px;
-        }
-
-        /* RESPONSIVE */
-        @media (max-width: 768px) {
-            .nav-header {
-                padding: 0 20px;
-            }
-
-            .header-nav {
-                gap: 20px;
-            }
-
-            .hero {
-                padding: 60px 20px 80px;
-            }
-
-            h1 {
-                font-size: 36px;
-            }
-
-            .documentation-container {
-                padding: 0 20px 60px;
-            }
-
-            .doc-grid {
-                grid-template-columns: 1fr;
-            }
-
-            .section-header h2 {
-                font-size: 24px;
-            }
-        }
-    </style>
+    <link rel="stylesheet" href="../header-style.css"/>
 </head>
 <body>
     <div class="progress">
diff --git a/articles/frelon_asiatique_evolution 2.html b/articles/frelon_asiatique_evolution 2.html
index 0872648..d2baa68 100644
--- a/articles/frelon_asiatique_evolution 2.html	
+++ b/articles/frelon_asiatique_evolution 2.html	
@@ -6,616 +6,14 @@
 <title>Vespa velutina — Invasion de France | NextGN Formation</title>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/4.4.1/chart.umd.min.js"></script>
 <link href="https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap" rel="stylesheet">
-<style>
-  :root {
-    --amber: #BA7517;
-    --amber-mid: #BA7517;
-    --amber-light: #FAEEDA;
-    --amber-dark: #633806;
-    --amber: #BA7517;
-    --amber-light: #FAEEDA;
-    --amber-dark: #633806;
-    --coral: #993C1D;
-    --coral-mid: #D85A30;
-    --coral-light: #FAECE7;
-    --purple: #BA7517;
-    --purple-light: #FAEEDA;
-    --purple-dark: #633806;
-    --blue: #BA7517;
-    --blue-light: #FAEEDA;
-    --bg: #F7F6F2;
-    --white: #FFFFFF;
-    --text: #1a1a18;
-    --text-muted: #6b6a65;
-    --border: rgba(0,0,0,0.1);
-  }
-
-  * { margin: 0; padding: 0; box-sizing: border-box; }
-
-  html { scroll-behavior: smooth; }
-
-  body {
-    background: var(--bg);
-    color: var(--text);
-    font-family: 'DM Sans', sans-serif;
-    font-weight: 400;
-    min-height: 100vh;
-    padding-top: 70px;
-  }
-
-  @media print {
-    .no-print { display: none !important; }
-    body { background: white; padding-top: 0; }
-  }
-
-  /* ═══ HEADER FIXE ═══════════════════════════════════════════════════════ */
-  .nav-header {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    height: 70px;
-    background: rgba(250, 238, 218, 0.98);
-    backdrop-filter: blur(10px);
-    border-bottom: 2px solid var(--amber);
-    z-index: 1000;
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    padding: 0 40px;
-    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
-  }
-
-  .header-logo {
-    font-family: 'Syne', sans-serif;
-    font-size: 18px;
-    font-weight: 800;
-    letter-spacing: 0.02em;
-    background: linear-gradient(135deg, var(--amber-mid) 0%, var(--amber-dark) 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-    display: flex;
-    align-items: center;
-    gap: 8px;
-  }
-
-  .header-logo span {
-    color: var(--amber);
-  }
-
-  .header-nav {
-    display: flex;
-    gap: 40px;
-    align-items: center;
-  }
-
-  .header-nav a {
-    font-family: 'Syne', sans-serif;
-    font-size: 12px;
-    font-weight: 700;
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
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-  .hero {
-    background: var(--amber-light);
-    border-left: 4px solid var(--amber-mid);
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-      font-size: 32px;
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-      font-size: 24px;
-      margin: 40px 0 16px;
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-      width: 100%;
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-      flex-direction: column;
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-      margin-right: 0;
-      margin-bottom: 12px;
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-  }
-
-  @media (max-width: 480px) {
-    .nav-header {
-      padding: 0 16px;
-    }
-
-    .hero h1 {
-      font-size: 24px;
-    }
-
-    h2 {
-      font-size: 20px;
-    }
-
-    .chart-container {
-      height: 280px;
-      padding: 16px;
-    }
-  }
-</style>
+<link rel="stylesheet" href="../header-style.css"/>
 </head>
 <body>
 
 <!-- HEADER NAVIGATION -->
     <header>
         <div class="logo">NextGN Formation</div>
-            <a href="../../index.html">Accueil</a>
+            <a href="../../index.html">Accueil</a>
         <nav>
             <a href="../../index.html#formations">Exercices</a>
             <a href="../../index.html#documentation">Documentation</a>
diff --git a/articles/frelon_asiatique_evolution 3.html b/articles/frelon_asiatique_evolution 3.html
index 049ea11..98351c9 100644
--- a/articles/frelon_asiatique_evolution 3.html	
+++ b/articles/frelon_asiatique_evolution 3.html	
@@ -6,616 +6,14 @@
 <title>Vespa velutina — Invasion de France | NextGN Formation</title>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/4.4.1/chart.umd.min.js"></script>
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-    --amber-mid: #BA7517;
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-    --amber: #BA7517;
-    --amber-light: #FAEEDA;
-    --amber-dark: #633806;
-    --coral: #993C1D;
-    --coral-mid: #D85A30;
-    --coral-light: #FAECE7;
-    --purple: #BA7517;
-    --purple-light: #FAEEDA;
-    --purple-dark: #633806;
-    --blue: #BA7517;
-    --blue-light: #FAEEDA;
-    --bg: #F7F6F2;
-    --white: #FFFFFF;
-    --text: #1a1a18;
-    --text-muted: #6b6a65;
-    --border: rgba(0,0,0,0.1);
-  }
-
-  * { margin: 0; padding: 0; box-sizing: border-box; }
-
-  html { scroll-behavior: smooth; }
-
-  body {
-    background: var(--bg);
-    color: var(--text);
-    font-family: 'DM Sans', sans-serif;
-    font-weight: 400;
-    min-height: 100vh;
-    padding-top: 70px;
-  }
-
-  @media print {
-    .no-print { display: none !important; }
-    body { background: white; padding-top: 0; }
-  }
-
-  /* ═══ HEADER FIXE ═══════════════════════════════════════════════════════ */
-  .nav-header {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    height: 70px;
-    background: rgba(250, 238, 218, 0.98);
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-    border-bottom: 2px solid var(--amber);
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-    gap: 40px;
-    align-items: center;
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-    font-family: 'Syne', sans-serif;
-    font-size: 12px;
-    font-weight: 700;
-    letter-spacing: 0.08em;
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-    bottom: -4px;
-    left: 0;
-    width: 0;
-    height: 2px;
-    background: var(--amber);
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-    font-family: 'Syne', sans-serif;
-    font-size: 12px;
-    font-weight: 700;
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-    box-shadow: 0 8px 16px rgba(186, 117, 23, 0.25);
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-
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-    height: 100%;
-    background: var(--amber);
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-
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-  .toc-overlay {
-    display: none;
-    position: fixed;
-    top: 70px;
-    left: 0;
-    right: 0;
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-    color: var(--amber);
-    padding-left: 24px;
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-
-  /* ═══ LAYOUT PRINCIPAL ══════════════════════════════════════════════════ */
-  main {
-    max-width: 1200px;
-    margin: 0 auto;
-    padding: 40px 20px;
-  }
-
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-  .hero {
-    background: var(--amber-light);
-    border-left: 4px solid var(--amber-mid);
-    border-radius: 8px;
-    padding: 40px;
-    margin-bottom: 40px;
-    animation: fadeIn 0.6s ease-out;
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-    font-family: 'Syne', sans-serif;
-    font-size: 48px;
-    font-weight: 800;
-    line-height: 1.2;
-    color: var(--text);
-    margin-bottom: 16px;
-  }
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-    font-size: 18px;
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-    font-family: 'Syne', sans-serif;
-    font-size: 12px;
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-    margin-top: 20px;
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-
-  /* ═══ INTRO BOX ═════════════════════════════════════════════════════════ */
-  .intro {
-    background: var(--amber-light);
-    border-left: 4px solid var(--amber-mid);
-    border-radius: 8px;
-    padding: 20px;
-    margin-bottom: 30px;
-    font-size: 0.95em;
-    color: var(--text-muted);
-    line-height: 1.6;
-  }
-
-  /* ═══ SECTIONS H2 ══════════════════════════════════════════════════════ */
-  h2 {
-    font-family: 'Syne', sans-serif;
-    font-size: 32px;
-    font-weight: 700;
-    color: var(--text);
-    margin: 50px 0 20px;
-    padding-bottom: 12px;
-    border-bottom: 3px solid var(--amber-mid);
-    animation: slideInLeft 0.6s ease-out;
-  }
-
-  h2:target {
-    background: var(--amber-light);
-    padding: 20px;
-    border-radius: 8px;
-    margin-left: -20px;
-    margin-right: -20px;
-    padding-left: 20px;
-  }
-
-  h3 {
-    font-family: 'Syne', sans-serif;
-    font-size: 20px;
-    font-weight: 600;
-    color: var(--text);
-    margin: 25px 0 12px;
-  }
-
-  /* ═══ GRILLE DE CONTENU ════════════════════════════════════════════════ */
-  .grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
-    gap: 24px;
-    margin-bottom: 30px;
-  }
-
-  .card {
-    background: var(--amber-light);
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    padding: 24px;
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-    font-size: 14px;
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-  /* ═══ LÉGENDE ══════════════════════════════════════════════════════════ */
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-    border: 1px solid var(--border);
-    color: var(--text);
-    background: var(--bg);
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-  .source-chip:hover {
-    background: var(--amber-light);
-    border-color: var(--amber);
-    color: var(--amber);
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-  .source-chip.verified {
-    background: var(--amber-light);
-    border-color: var(--amber);
-    color: var(--amber-dark);
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-  .source-chip.official {
-    background: var(--amber-light);
-    border-color: var(--amber);
-    color: var(--amber);
-  }
-
-  /* ═══ FOOTER ═══════════════════════════════════════════════════════════ */
-  footer {
-    background: var(--text);
-    color: var(--white);
-    padding: 40px 20px;
-    text-align: center;
-    font-size: 13px;
-    margin-top: 60px;
-  }
-
-  footer p {
-    margin: 0;
-    line-height: 1.6;
-  }
-
-  /* ═══ RESPONSIVE ═══════════════════════════════════════════════════════ */
-  @media (max-width: 768px) {
-    .nav-header {
-      padding: 0 20px;
-    }
-
-    .header-nav {
-      display: none;
-    }
-
-    .toggle-toc {
-      display: block;
-    }
-
-    main {
-      padding: 20px 16px;
-    }
-
-    .hero {
-      padding: 24px;
-    }
-
-    .hero h1 {
-      font-size: 32px;
-    }
-
-    h2 {
-      font-size: 24px;
-      margin: 40px 0 16px;
-    }
-
-    .grid {
-      grid-template-columns: 1fr;
-    }
-
-    .toc-panel {
-      width: 100%;
-      right: -100%;
-    }
-
-    .sources {
-      flex-direction: column;
-      align-items: flex-start;
-    }
-
-    .sources-label {
-      margin-right: 0;
-      margin-bottom: 12px;
-    }
-  }
-
-  @media (max-width: 480px) {
-    .nav-header {
-      padding: 0 16px;
-    }
-
-    .hero h1 {
-      font-size: 24px;
-    }
-
-    h2 {
-      font-size: 20px;
-    }
-
-    .chart-container {
-      height: 280px;
-      padding: 16px;
-    }
-  }
-</style>
+<link rel="stylesheet" href="../header-style.css"/>
 </head>
 <body>
 
 <!-- HEADER NAVIGATION -->
     <header>
         <div class="logo">NextGN Formation</div>
-            <a href="../../index.html">Accueil</a>
+            <a href="../../index.html">Accueil</a>
         <nav>
             <a href="../../index.html#formations">Exercices</a>
             <a href="../../index.html#documentation">Documentation</a>
@@ -904,10 +302,10 @@
 </main>
 
 <!-- ═══ FOOTER ════════════════════════════════════════════════════════════════ -->
-        <footer>
-            <p>&copy; 2026 NextGN Formation - Formations Certibiocide & Techniques</p>
-            <p style="margin-top: 10px; opacity: 0.6;">Tous droits réservés — Gauthier Chombart & Nathan Chauwin — Formateurs indépendants</p>
-        </footer>
+        <footer>
+            <p>&copy; 2026 NextGN Formation - Formations Certibiocide & Techniques</p>
+            <p style="margin-top: 10px; opacity: 0.6;">Tous droits réservés — Gauthier Chombart & Nathan Chauwin — Formateurs indépendants</p>
+        </footer>
 
 <!-- ═══ JAVASCRIPT ════════════════════════════════════════════════════════════ -->
 <script>
diff --git a/articles/frelon_asiatique_evolution.html b/articles/frelon_asiatique_evolution.html
index cdadb87..2e5d774 100644
--- a/articles/frelon_asiatique_evolution.html
+++ b/articles/frelon_asiatique_evolution.html
@@ -6,609 +6,7 @@
 <title>Vespa velutina — Invasion de France | NextGN Formation</title>
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-<style>
-  :root {
-    --teal: #0F6E56;
-    --teal-mid: #1D9E75;
-    --teal-light: #E1F5EE;
-    --teal-dark: #085041;
-    --amber: #BA7517;
-    --amber-light: #FAEEDA;
-    --amber-dark: #633806;
-    --coral: #993C1D;
-    --coral-mid: #D85A30;
-    --coral-light: #FAECE7;
-    --purple: #534AB7;
-    --purple-light: #EEEDFE;
-    --purple-dark: #3C3489;
-    --blue: #185FA5;
-    --blue-light: #E6F1FB;
-    --bg: #F7F6F2;
-    --white: #FFFFFF;
-    --text: #1a1a18;
-    --text-muted: #6b6a65;
-    --border: rgba(0,0,0,0.1);
-  }
-
-  * { margin: 0; padding: 0; box-sizing: border-box; }
-
-  html { scroll-behavior: smooth; }
-
-  body {
-    background: var(--bg);
-    color: var(--text);
-    font-family: 'DM Sans', sans-serif;
-    font-weight: 400;
-    min-height: 100vh;
-    padding-top: 70px;
-  }
-
-  @media print {
-    .no-print { display: none !important; }
-    body { background: white; padding-top: 0; }
-  }
-
-  /* ═══ HEADER FIXE ═══════════════════════════════════════════════════════ */
-  .nav-header {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    height: 70px;
-    background: rgba(255, 255, 255, 0.95);
-    backdrop-filter: blur(10px);
-    border-bottom: 1px solid var(--border);
-    z-index: 1000;
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    padding: 0 40px;
-    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
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-
-  .header-logo {
-    font-family: 'Syne', sans-serif;
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-    letter-spacing: 0.02em;
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-  .header-logo span {
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-  .header-nav {
-    display: flex;
-    gap: 40px;
-    align-items: center;
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-    font-family: 'Syne', sans-serif;
-    font-size: 12px;
-    font-weight: 700;
-    letter-spacing: 0.08em;
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-    color: var(--text);
-    text-decoration: none;
-    position: relative;
-    transition: color 0.3s ease;
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-    bottom: -4px;
-    left: 0;
-    width: 0;
-    height: 2px;
-    background: var(--teal-mid);
-    transition: width 0.3s ease;
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-
-  .toggle-toc:hover {
-    background: var(--teal-mid);
-    color: var(--white);
-    transform: translateY(-2px);
-    box-shadow: 0 8px 16px rgba(186, 117, 23, 0.25);
-  }
-
-  /* ═══ BARRE DE PROGRESSION ══════════════════════════════════════════════ */
-  .progress {
-    position: fixed;
-    top: 70px;
-    left: 0;
-    right: 0;
-    height: 3px;
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-    z-index: 999;
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-
-  .progress-bar {
-    height: 100%;
-    background: var(--teal-mid);
-    width: 0%;
-    transition: width 0.3s ease;
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-
-  /* ═══ SOMMAIRE COLLAPSIBLE ═════════════════════════════════════════════ */
-  .toc-overlay {
-    display: none;
-    position: fixed;
-    top: 70px;
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-  .toc-overlay.active {
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-
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-  .toc-panel.active {
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-    transition: all 0.2s ease;
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-  /* ═══ ANIMATIONS ═══════════════════════════════════════════════════════ */
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-    from { opacity: 0; transform: translateY(10px); }
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-
-  .section {
-    animation: fadeIn 0.6s ease-out;
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-
-  /* ═══ LAYOUT PRINCIPAL ══════════════════════════════════════════════════ */
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-    max-width: 1200px;
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-    padding: 40px 20px;
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-
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-    background: var(--amber-light);
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-    border-radius: 8px;
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-  .intro {
-    background: var(--amber-light);
-    border-left: 4px solid var(--teal-mid);
-    border-radius: 8px;
-    padding: 20px;
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-    font-size: 0.95em;
-    color: var(--text-muted);
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-
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-    font-size: 32px;
-    font-weight: 700;
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-    margin: 50px 0 20px;
-    padding-bottom: 12px;
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-  h2:target {
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-
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-    font-family: 'Syne', sans-serif;
-    font-size: 20px;
-    font-weight: 600;
-    color: var(--text);
-    margin: 25px 0 12px;
-  }
-
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-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
-    gap: 24px;
-    margin-bottom: 30px;
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-
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-    margin-bottom: 8px;
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-  .card h3 {
-    margin-top: 0;
-    font-size: 22px;
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-  /* ═══ ALERTE / CALLOUT ═════════════════════════════════════════════════ */
-  .alert {
-    background: var(--white);
-    border-left: 4px solid var(--teal-mid);
-    border-radius: 8px;
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-  }
-
-  /* ═══ CHARTS ═══════════════════════════════════════════════════════════ */
-  .chart-container {
-    background: var(--white);
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    padding: 24px;
-    margin: 24px 0;
-    position: relative;
-    height: 320px;
-  }
-
-  .chart-title {
-    font-family: 'Syne', sans-serif;
-    font-size: 16px;
-    font-weight: 700;
-    color: var(--teal-mid);
-    margin-bottom: 16px;
-  }
-
-  /* ═══ LÉGENDE ══════════════════════════════════════════════════════════ */
-  .legend {
-    display: flex;
-    gap: 20px;
-    margin-top: 16px;
-    flex-wrap: wrap;
-    font-size: 12px;
-  }
-
-  .legend-item {
-    display: flex;
-    align-items: center;
-    gap: 8px;
-  }
-
-  .legend-dot {
-    width: 12px;
-    height: 12px;
-    border-radius: 50%;
-    flex-shrink: 0;
-  }
-
-  /* ═══ SOURCES ══════════════════════════════════════════════════════════ */
-  .sources {
-    background: var(--white);
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    padding: 24px;
-    margin: 40px 0;
-    display: flex;
-    flex-wrap: wrap;
-    gap: 12px;
-    align-items: center;
-  }
-
-  .sources-label {
-    font-family: 'Syne', sans-serif;
-    font-size: 12px;
-    font-weight: 700;
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
-    color: var(--teal-mid);
-    margin-right: 8px;
-  }
-
-  .source-chip {
-    font-size: 11px;
-    padding: 6px 12px;
-    border-radius: 20px;
-    text-decoration: none;
-    transition: all 0.2s ease;
-    border: 1px solid var(--border);
-    color: var(--text);
-    background: var(--bg);
-  }
-
-  .source-chip:hover {
-    background: var(--amber-light);
-    border-color: var(--teal-mid);
-    color: var(--teal-mid);
-  }
-
-  .source-chip.verified {
-    background: var(--teal-light);
-    border-color: var(--teal);
-    color: var(--teal-dark);
-  }
-
-  .source-chip.official {
-    background: var(--blue-light);
-    border-color: var(--blue);
-    color: var(--blue);
-  }
-
-  /* ═══ FOOTER ═══════════════════════════════════════════════════════════ */
-  footer {
-    background: var(--text);
-    color: var(--white);
-    padding: 40px 20px;
-    text-align: center;
-    font-size: 13px;
-    margin-top: 60px;
-  }
-
-  footer p {
-    margin: 0;
-    line-height: 1.6;
-  }
-
-  /* ═══ RESPONSIVE ═══════════════════════════════════════════════════════ */
-  @media (max-width: 768px) {
-    .nav-header {
-      padding: 0 20px;
-    }
-
-    .header-nav {
-      display: none;
-    }
-
-    .toggle-toc {
-      display: block;
-    }
-
-    main {
-      padding: 20px 16px;
-    }
-
-    .hero {
-      padding: 24px;
-    }
-
-    .hero h1 {
-      font-size: 32px;
-    }
-
-    h2 {
-      font-size: 24px;
-      margin: 40px 0 16px;
-    }
-
-    .grid {
-      grid-template-columns: 1fr;
-    }
-
-    .toc-panel {
-      width: 100%;
-      right: -100%;
-    }
-
-    .sources {
-      flex-direction: column;
-      align-items: flex-start;
-    }
-
-    .sources-label {
-      margin-right: 0;
-      margin-bottom: 12px;
-    }
-  }
-
-  @media (max-width: 480px) {
-    .nav-header {
-      padding: 0 16px;
-    }
-
-    .hero h1 {
-      font-size: 24px;
-    }
-
-    h2 {
-      font-size: 20px;
-    }
-
-    .chart-container {
-      height: 280px;
-      padding: 16px;
-    }
-  }
-</style>
+<link rel="stylesheet" href="../header-style.css"/>
 </head>
 <body>