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

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

th, td {
            padding: 10px;
            text-align: center;
            height: 40px;
            border: 1px solid #ccc;
            white-space: nowrap;
            min-width: 120px;
            position: relative;
            background-color: white;
            box-sizing: border-box;
        }

/* ✅ Fixation des cellules d'en-tête */
        th {
            background-color: #f2f2f2;
            position: sticky;
            top: 0;
            z-index: 60;
        }

/* ✅ Colonnes sticky */
        th:first-child, td:first-child {
            position: sticky;
            left: 0;
            z-index: 61;
            background-color: white;
        }

th:nth-child(2), td:nth-child(2) {
            position: sticky;
            left: 120px;
            z-index: 60;
            background-color: white;
        }

th:nth-child(3), td:nth-child(3) {
            position: sticky;
            left: 240px;
            z-index: 59;
            background-color: white;
        }

/* ✅ Bordures droites persistantes */
        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: 62;
        }

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

/* ✅ Largeur fixe des autres colonnes */
        th:nth-child(n+4), td:nth-child(n+4) {
            min-width: 150px;
        }

/* ✅ Deuxième ligne d'en-tête sticky */
        .second-header th {
            background-color: #f2f2f2;
            position: sticky;
            top: 40px;
            z-index: 59;
        }

/* ✅ Troisième ligne d'en-tête sticky */
        .third-header th {
            background-color: #f2f2f2;
            position: sticky;
            top: 80px;
            z-index: 58;
        }

/* ✅ Correction du positionnement des 3 premières colonnes de la deuxième et troisième ligne */
        .second-header th:first-child, .third-header th:first-child {
            left: 0;
            z-index: 61;
            background-color: white;
        }

.second-header th:nth-child(2), .third-header th:nth-child(2) {
            left: 120px;
            z-index: 60;
            background-color: white;
        }

.second-header th:nth-child(3), .third-header th:nth-child(3) {
            left: 240px;
            z-index: 59;
            background-color: white;
        }

/* ✅ Correction du z-index pour éviter le recouvrement */
        thead tr:first-child th:first-child, 
        thead tr:first-child th:nth-child(2), 
        thead tr:first-child th:nth-child(3) {
            z-index: 70;
            background-color: #ddd;
        }

.second-header th:first-child, 
        .second-header th:nth-child(2), 
        .second-header th:nth-child(3) {
            z-index: 69;
        }

.third-header th:first-child, 
        .third-header th:nth-child(2), 
        .third-header th:nth-child(3) {
            z-index: 68;
        }

/* ✅ Bordures inférieures fixes sans chevauchement */
        thead tr:first-child th,
        .second-header th,
        .third-header th {
            box-shadow: inset 0 -2px #aaa;
            background-clip: padding-box;
            padding-bottom: 2px; /* Ajustement pour éviter le chevauchement visuel */
        }

</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>
            
            <tr class="second-header">
                <th></th>
                <th>Valeur 1</th>
                <th>Valeur 2</th>
                <?php for ($i = 1; $i <= 50; $i++): ?>
                    <th>Val <?php echo $i; ?></th>
                <?php endfor; ?>
            </tr>
            
            <tr class="third-header">
                <th></th>
                <th>Info 1</th>
                <th>Info 2</th>
                <?php for ($i = 1; $i <= 50; $i++): ?>
                    <th>Info <?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 . "-2"; ?></td>
                    <td>cretin <?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>