Preview:
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document Download</title>
    <style>
        body {
            font-family: Cambria, sans-serif;
            background: #E0F7FA;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .form-box {
            background: #00FFFF;
            padding: 20px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            border-radius: 10px;
            text-align: center;
            width: 350px;
            max-width: 90%;
        }

        input, button {
            padding: 10px;
            margin: 10px 0;
            width: 100%;
            box-sizing: border-box;
        }

        a button {
            background: #007BFF;
            color: white;
            border: none;
            cursor: pointer;
            padding: 10px 20px;
            width: auto;
            margin-top: 5px;
        }

        a button:hover {
            background: #0056b3;
        }

        #result {
            margin-top: 20px;
            font-weight: bold;
        }

        .not-available {
            color: red;
            margin: 5px 0;
        }

        .loader {
            width: 50px;
            height: 50px;
            position: relative;
            margin: 20px auto;
            display: none;
        }

        .loader::before {
            content: '';
            position: absolute;
            border: 5px solid #007BFF;
            border-radius: 50%;
            width: 30px;
            height: 30px;
            top: 0;
            left: 0;
            animation: spin 1s linear infinite;
            border-right-color: transparent;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
    </style>
</head>
<body>

<div class="form-box">
    <h2>Download Important Documents of the Trainees<br>Session 2025–2027</h2>

    <input type="text" id="regNo" placeholder="Enter Registration Number"><br>
    <input type="text" id="traineeName" placeholder="Enter Your Name"><br>
    <button id="submitBtn" onclick="checkDocuments()">Submit</button>

    <div class="loader" id="loader"></div>
    <div id="result"></div>
</div>

<script>
function checkDocuments() {
    const regNo = document.getElementById("regNo").value.trim();
    const traineeName = document.getElementById("traineeName").value.trim().toLowerCase();
    const resultDiv = document.getElementById("result");
    const submitBtn = document.getElementById("submitBtn");
    const loader = document.getElementById("loader");

    if (!regNo || !traineeName) {
        alert("Please enter both Registration Number and Trainee Name");
        return;
    }

    resultDiv.innerHTML = "";
    loader.style.display = "block";
    submitBtn.disabled = true;

    const apiUrl = `https://script.google.com/macros/s/AKfycbxIEcEHZ2gokJPGLeU6y8mrjJG4rbJoOfSubjqfqxw46i3ilXc-t2Bl13e1jOfabJ7L/exec?regNo=${encodeURIComponent(regNo)}&traineeName=${encodeURIComponent(traineeName)}`;

    fetch(apiUrl)
        .then(response => response.json())
        .then(data => {
            if (Object.keys(data).length > 0) {
                let links = `<p>Hello, ${traineeName.toUpperCase()}!</p>`;

                // Get all keys ending with ' Link'
                const linkKeys = Object.keys(data).filter(key => key.endsWith(' Link'));

                if (linkKeys.length === 0) {
                    links += `<p class="not-available">No downloadable documents found.</p>`;
                } else {
                    linkKeys.forEach(key => {
                        const label = key.replace(" Link", "");

                        if (data[key]) {
                            links += `<a href="${data[key]}" target="_blank" rel="noopener noreferrer">
                                        <button>Download ${label}</button>
                                      </a>`;
                        } else {
                            links += `<p class="not-available">${label}: Document not available yet.</p>`;
                        }
                    });
                }

                resultDiv.innerHTML = links;
            } else {
                resultDiv.innerHTML = "<p class='not-available'>No documents found for this registration number and name.</p>";
            }
        })
        .catch(error => {
            console.error(error);
            resultDiv.innerHTML = "<p class='not-available'>Documents not Available.</p>";
        })
        .finally(() => {
            loader.style.display = "none";
            submitBtn.disabled = false;
        });
}
</script>

</body>
</html>
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