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<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Tableau Sticky + Scroll Snap</title>
    <style>
        /* ✅ Conteneur principal pour le scroll */
        .table-wrapper {
            width: 100%;
            max-height: 400px;
            overflow: auto;
            border: 1px solid #ccc;
            scroll-snap-type: both mandatory;
        }

table {
            width: max-content;
            border-collapse: collapse;
        }

th, td {
            padding: 10px;
            text-align: center;
            vertical-align: middle;
            border: 1px solid #ccc;
            min-width: 120px;
            height: 40px;
            box-sizing: border-box; /* S'assure que padding + border n'affectent pas la largeur totale */
        }

/* ✅ Sticky Header pour les 3 premières colonnes */
        th {
            background-color: #f2f2f2;
            position: sticky;
            top: 0;
            z-index: 10;
            border-bottom: 2px solid #aaa;
        }

/* ✅ Première colonne sticky */
        th:first-child, td:first-child {
            position: sticky;
            left: 0;
            background-color: white;
            z-index: 20;
            border-right: none;
            min-width: 120px;
            box-sizing: border-box;
        }

/* ✅ Deuxième colonne sticky */
        th:nth-child(2), td:nth-child(2) {
            position: sticky;
            left: 120px;
            background-color: white;
            z-index: 19;
            border-right: none;
            min-width: 120px;
            box-sizing: border-box;
        }

/* ✅ Troisième colonne sticky */
        th:nth-child(3), td:nth-child(3) {
            position: sticky;
            left: 240px;
            background-color: white;
            z-index: 18;
            border-right: none;
            min-width: 120px;
            box-sizing: border-box;
        }

/* ✅ Bordures gauche fixes pour les 3 premières colonnes */
        th:first-child, td:first-child {
            border-left: 2px solid #ccc;
        }

th:nth-child(2), td:nth-child(2) {
            border-left: 2px solid #ccc;
        }

th:nth-child(3), td:nth-child(3) {
            border-left: 2px solid #ccc;
        }

/* ✅ Pseudo-bordures pour maintenir la visibilité des bordures */
        th:first-child::after, td:first-child::after,
        th:nth-child(2)::after, td:nth-child(2)::after,
        th:nth-child(3)::after, td:nth-child(3)::after {
            content: "";
            position: absolute;
            right: 0;
            top: 0;
            width: 2px;
            height: 100%;
            background-color: #ccc;
            z-index: 25;
        }

/* ✅ Coin supérieur gauche sticky */
        th:first-child {
            position: sticky;
            top: 0;
            left: 0;
            z-index: 30;
            background-color: #ddd;
            border-bottom: 2px solid #aaa;
        }

/* ✅ Alignement des cellules */
        th, td {
            text-align: center;
            vertical-align: middle;
        }

/* ✅ Alternance des couleurs pour lisibilité */
        tbody tr:nth-child(odd) {
            background-color: #f9f9f9;
        }

</style>
</head>
<body>

<div class="table-wrapper">
    <table>
        <thead>
            <tr>
                <th></th> 
                <th>plouf</th> 
                <th>cretin</th> 
                <?php for ($i = 1; $i <= 50; $i++): ?>
                    <th>Col <?php echo $i; ?></th>
                <?php endfor; ?>
            </tr>
        </thead>
        <tbody>
            <?php for ($i = 1; $i <= 50; $i++): ?>
                <tr>
                    <td>Row <?php echo $i; ?></td>
                    <td>Data <?php echo $i; ?>-1</td>
                    <td>Data <?php echo $i; ?>-2</td>
                    <?php for ($j = 1; $j <= 50; $j++): ?>
                        <td>Data <?php echo $i . "-" . ($j + 2); ?></td>
                    <?php endfor; ?>
                </tr>
            <?php endfor; ?>
        </tbody>
    </table>
</div>

</body>
</html>