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diff --git a/sertifikat/sertif1.pdf b/sertifikat/sertif1.pdf
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diff --git a/sertifikat/sertif8.pdf b/sertifikat/sertif8.pdf
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diff --git a/sertifikat/sertif9.pdf b/sertifikat/sertif9.pdf
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diff --git a/tampilan/cek_sertifikat.php b/tampilan/cek_sertifikat.php
new file mode 100644
index 0000000..20a9732
--- /dev/null
+++ b/tampilan/cek_sertifikat.php
@@ -0,0 +1,136 @@
+<?php
+// Mengambil parameter dari URL
+$pdfFile = isset($_GET['file']) ? $_GET['file'] : '';
+$id = isset($_GET['id']) ? $_GET['id'] : '';
+
+// Validasi input
+if (!$pdfFile) {
+    die("File PDF tidak ditemukan! Tambahkan parameter ?file=namafile.pdf di URL.");
+}
+
+// Ambil data siswa dan sertifikat
+$query = "SELECT Nama_Siswa, NIS, Jurusan, Kelas, No_Telp, Email, Angkatan, Kategori, Sub_Kategori, Jenis_Kegiatan, Status, Catatan 
+          FROM sertifikat 
+          INNER JOIN kegiatan USING(Id_Kegiatan) 
+          INNER JOIN kategori USING(Id_Kategori) 
+          INNER JOIN siswa USING(NIS) 
+          INNER JOIN jurusan USING(Id_Jurusan) 
+          WHERE Id_Sertifikat = '$id'";
+
+$result = mysqli_query($koneksi, $query);
+$data = mysqli_fetch_assoc($result);
+
+$tgl = date("Y-m-d");
+
+// Proses update status sertifikat
+if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['tombol_submit'])) {
+    $status = $_POST['status'];
+    $catatan = isset($_POST['catatan']) ? mysqli_real_escape_string($koneksi, $_POST['catatan']) : NULL;
+
+    $updateQuery = "UPDATE sertifikat SET 
+                    Catatan = " . ($status === 'Tidak Valid' ? "'$catatan'" : "NULL") . ", 
+                    Status = '$status', 
+                    Tanggal_Status_Berubah = '$tgl' 
+                    WHERE Id_Sertifikat='$id'";
+
+    $hasil = mysqli_query($koneksi, $updateQuery);
+    if (!$hasil) {
+        echo "<script>alert('Gagal update data');window.location.href='halaman_utama.php?page=cek_sertifikat&id=$id&file=$pdfFile'</script>";
+    } else {
+        echo "<script>alert('Berhasil update data');window.location.href='halaman_utama.php?page=sertifikat'</script>";
+    }
+}
+?>
+
+<style>
+.container {
+    display: flex;
+    height: 100vh;
+}
+
+.pdf-container {
+    flex: 4;
+    border-right: 2px solid #ddd;
+    padding: 10px;
+}
+
+.pdf-container embed {
+    width: 100%;
+    height: 100vh;
+}
+
+.siswa-container {
+    flex: 1;
+    padding: 20px;
+    background-color: #f8f9fa;
+    overflow-y: auto;
+}
+</style>
+
+<div class="container">
+    <div class="pdf-container">
+        <embed src="../sertifikat/<?= htmlspecialchars($pdfFile) ?>" type="application/pdf">
+    </div>
+
+    <div class="siswa-container">
+        <h3>Detail Siswa</h3><br>
+        <p><strong>Nama:</strong> <?= $data["Nama_Siswa"] ?></p>
+        <p><strong>NIS:</strong> <?= $data["NIS"] ?></p>
+        <p><strong>Kelas:</strong> <?= $data["Jurusan"] . " " . $data["Kelas"] ?></p>
+        <p><strong>Telepon:</strong> <?= $data["No_Telp"] ?></p>
+        <p><strong>Email:</strong> <?= $data["Email"] ?></p>
+        <p><strong>Angkatan:</strong> <?= $data["Angkatan"] ?></p>
+        <br><br>
+
+        <h3>Kategori Kegiatan</h3><br>
+        <p><strong>Kategori:</strong> <?= $data["Kategori"] ?></p>
+        <p><strong>Sub Kategori:</strong> <?= $data["Sub_Kategori"] ?></p>
+        <p><strong>Kegiatan:</strong> <?= $data["Jenis_Kegiatan"] ?></p><br><br>
+
+
+
+
+        <?php if ($data["Status"] == "Menunggu Validasi"){ ?>
+        <button id="btn-tidak-valid" type="button" onclick="toggleInvalid()" style="float:left;">Tidak Valid</button>
+        <button id="btn-batal" type="button" style="display: none;" onclick="cancelInvalid()">Batal</button>
+        <form action="" method="POST">
+            <input type="hidden" name="status" value="Valid">
+            <button type="submit" id="btn-valid" style="float:right;">✅ Valid</button>
+        </form>
+
+        <form action="" method="POST">
+            <div id="catatan-container" style="display: none;"><br>
+                <textarea name="catatan" placeholder="Tulis catatan di sini..." rows="10" cols="38"></textarea>
+            </div>
+            <input type="hidden" name="status" value="Tidak Valid">
+            <button type="submit" name="tombol_submit" id="btn-submit"
+                style="display: none; float:right;">Submit</button>
+        </form>
+
+        <?php }elseif ($data["Status"] == "Tidak Valid"){ ?>
+        <div id="catatan-container">
+            <textarea readonly name=" catatan" placeholder="Tulis catatan di sini..."
+                style="height: 150px"><?= $data["Catatan"] ?></textarea>
+        </div>
+        <?php } ?>
+    </div>
+
+
+    <script>
+    function toggleInvalid() {
+        document.getElementById('btn-tidak-valid').style.display = 'none';
+        document.getElementById('btn-valid').style.display = 'none';
+        document.getElementById('btn-batal').style.display = 'inline-block';
+        document.getElementById('btn-submit').style.display = 'inline-block';
+        document.getElementById('catatan-container').style.display = 'block';
+    }
+
+    function cancelInvalid() {
+        document.getElementById('btn-tidak-valid').style.display = 'inline-block';
+        document.getElementById('btn-valid').style.display = 'inline-block';
+        document.getElementById('btn-batal').style.display = 'none';
+        document.getElementById('btn-submit').style.display = 'none';
+        document.getElementById('catatan-container').style.display = 'none';
+    }
+    </script>
+</div>
\ No newline at end of file
diff --git a/tampilan/halaman_utama.php b/tampilan/halaman_utama.php
index 335be08..0e66b26 100644
--- a/tampilan/halaman_utama.php
+++ b/tampilan/halaman_utama.php
@@ -176,6 +176,9 @@ include "../koneksi.php";
         case "sertifikat":
             include "sertifikat.php";
             break;
+        case "cek_sertifikat":
+            include "cek_sertifikat.php";
+            break;
     }
     ?>
 
diff --git a/tampilan/sertifikat.php b/tampilan/sertifikat.php
index 4836e05..6892d40 100644
--- a/tampilan/sertifikat.php
+++ b/tampilan/sertifikat.php
@@ -38,7 +38,7 @@ function getSertifikat($koneksi, $status = '', $kegiatan = '') {
                     <td>{$data['Nama_Siswa']}</td>
                     <td>{$data['Angkatan']}</td>
                     <td>{$data['Status']}</td>
-                    <td><a href='../gambar/{$data['Sertifikat']}' target='_blank'>Lihat File</a></td>
+                    <td><a href='halaman_utama.php?page=cek_sertifikat&id={$data['Id_Sertifikat']}&file={$data['Sertifikat']}' target='_blank'>Lihat File</a></td>
                   </tr>";
         }
         echo "</table></center>";