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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</title>
    <style>
        .table-wrapper {
            width: 100%;
            max-height: 400px;
            overflow: auto;
            border: 1px solid #ccc;
        }

table {
            border-collapse: collapse;
            min-width: 2000px; /* ✅ Largeur augmentée pour forcer le scroll */
        }

th, td {
            padding: 10px;
            text-align: center;
            border: 1px solid #ccc;
            white-space: nowrap;
            position: relative; /* ✅ Permet d'ajouter les `::after` */
        }

/* ✅ Sticky Header */
        th {
            background-color: #f2f2f2;
            position: sticky;
            top: 0;
            z-index: 1000; /* ✅ Reste au-dessus */
        }

/* ✅ Sticky First Column */
        th:first-child, td:first-child {
            position: sticky;
            left: 0;
            background-color: #fff;
            min-width: 120px;
            max-width: 120px;
            padding-right: 10px;
            z-index: 999; /* ✅ Empêche d'être recouvert */
        }

/* ✅ Bordure droite persistante */
        th:first-child::after, td:first-child::after {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 2px;
            height: 100%;
            background-color: #ccc;
        }

/* ✅ Correction : PREMIÈRE CELLULE EN HAUT À GAUCHE */
        th:first-child {
            position: sticky;
            top: 0;
            left: 0;
            z-index: 1001; /* ✅ Priorité absolue */
            background-color: #eee;
        }

/* ✅ Bordure inférieure persistante pour la 1ère cellule */
        th:first-child::before {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #ccc;
        }

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

</style>
</head>
<body>

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

</body>
</html>