document.getElementById('assessmentForm').addEventListener('submit', function(event) {
    event.preventDefault(); // Prevent the form from reloading the page

    // Get values from the form and convert to numbers
    const passiveAngle = parseFloat(document.getElementById('passiveAngle').value);
    const activeAngle = parseFloat(document.getElementById('activeAngle').value);
    const latStanding = parseFloat(document.getElementById('latStanding').value);
    const latSeated = parseFloat(document.getElementById('latSeated').value);
    const pecMajorAngle = parseFloat(document.getElementById('pecMajorAngle').value);
    const externalRotationAngle = parseFloat(document.getElementById('externalRotationAngle').value);

    let reportHTML = '<h3>Your Personalized Diagnosis</h3>';
    let limitingFactors = [];

    // --- Analysis Logic ---

    // 1. Active vs. Passive (Strength vs. Flexibility)
    const flexionDifference = passiveAngle - activeAngle;
    let flexionReport = `<div class="report-section"><h4>Strength vs. Flexibility</h4>`;
    if (flexionDifference > 15) {
        flexionReport += `<p>Your passive range (${passiveAngle}°) is significantly greater than your active range (${activeAngle}°). This points to a <span class="limitation-positive">Motor Control or Strength Deficit</span>. You have the flexibility but lack the strength to use it.</p>`;
        limitingFactors.push('Motor Control/Strength');
    } else {
        flexionReport += `<p>Your active and passive ranges are similar. Any limitation is likely due to tissue tightness. <span class="limitation-negative">This is a good result.</span></p>`;
    }
    flexionReport += `</div>`;
    reportHTML += flexionReport;


    // 2. Lat Length Test
    const latDifference = latStanding - latSeated;
    let latReport = `<div class="report-section"><h4>Latissimus Dorsi (Lats)</h4>`;
    if (latDifference > 15) {
        latReport += `<p>Your range of motion dropped significantly from ${latStanding}° (standing) to ${latSeated}° (seated/rounded). This strongly indicates that <span class="limitation-positive">Tight Lats</span> are a primary limiting factor.</p>`;
        limitingFactors.push('Tight Lats');
    } else {
        latReport += `<p>Your range of motion was stable between the two positions. Your lats are likely not a significant restriction. <span class="limitation-negative">This is a good result.</span></p>`;
    }
    latReport += `</div>`;
    reportHTML += latReport;

    // 3. Pec Major Length Test
    let pecReport = `<div class="report-section"><h4>Pectoralis Major (Pecs)</h4>`;
    if (pecMajorAngle < 45) {
        pecReport += `<p>Your arms only reached ${pecMajorAngle}° past your shoulders (goal is 45°). This indicates <span class="limitation-positive">Tight Pec Major</span> muscles, which can pull the shoulders forward.</p>`;
        limitingFactors.push('Tight Pec Major');
    } else {
        pecReport += `<p>You achieved ${pecMajorAngle}° of extension, meeting the goal of 45°. Your pec major length is excellent. <span class="limitation-negative">This is a great result.</span></p>`;
    }
    pecReport += `</div>`;
    reportHTML += pecReport;

    // 4. External Rotation Test
    let externalRotationReport = `<div class="report-section"><h4>Internal Rotators (Subscapularis & Teres Major)</h4>`;
    if (externalRotationAngle < 45) {
        externalRotationReport += `<p>Your external rotation was ${externalRotationAngle}° past vertical (goal is 45°). This indicates <span class="limitation-positive">Tight Internal Rotators</span>, a very common issue that restricts overhead mobility.</p>`;
        limitingFactors.push('Tight Internal Rotators');
    } else {
        externalRotationReport += `<p>You achieved ${externalRotationAngle}° of external rotation, meeting the goal of 45°. Your internal rotator length is excellent. <span class="limitation-negative">This is a great result.</span></p>`;
    }
    externalRotationReport += `</div>`;
    reportHTML += externalRotationReport;

    // --- Final Summary ---
    let summaryReport = `<div class="report-section"><h3>Summary & Recommendations</h3>`;
    if (limitingFactors.length === 0) {
        summaryReport += `<p><span class="limitation-negative">Excellent work!</span> Based on your results, you have well-balanced shoulder mobility with no significant limitations detected. Focus on maintaining this balance with a well-rounded program.</p>`;
    } else {
        summaryReport += `<p>Your primary areas for improvement appear to be: <span class="limitation-positive">${limitingFactors.join(', ')}</span>.</p>`;
        summaryReport += `<p>To improve your shoulder health, prioritize stretches and mobility drills that target these specific muscles.</p>`;
    }
    summaryReport += `</div>`;
    reportHTML += summaryReport;


    // Display the final report on the page
    const reportOutput = document.getElementById('reportOutput');
    reportOutput.innerHTML = reportHTML;
    reportOutput.scrollIntoView({ behavior: 'smooth' }); // Automatically scroll to the results
});