Add download

src/main/resources/static/css/styles.css

@@ -385,6 +385,67 @@ body {
     border-color: rgba(124, 58, 237, 0.18);
 }
 
+.download-section {
+    margin-top: 26px;
+    padding: 20px;
+    background: rgba(11, 18, 32, 0.92);
+    border-radius: 14px;
+    border: 1px solid #1f2937;
+    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
+    display: flex;
+    flex-direction: column;
+    gap: 14px;
+}
+
+.download-header h2, .download-header h3 {
+    margin: 6px 0 8px;
+}
+
+.version-inline {
+    font-weight: 700;
+    color: #e2e8f0;
+}
+
+.download-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
+    gap: 12px;
+}
+
+.download-card {
+    border: 1px solid #1f2937;
+    border-radius: 12px;
+    padding: 14px;
+    background: rgba(15, 23, 42, 0.82);
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
+}
+
+.download-card-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 10px;
+}
+
+.download-card--active {
+    border-color: rgba(124, 58, 237, 0.55);
+    box-shadow: 0 16px 40px rgba(124, 58, 237, 0.22);
+    transform: translateY(-2px);
+}
+
+.download-card .button {
+    margin-top: 4px;
+}
+
+.download-card-block {
+    display: flex;
+    flex-direction: column;
+    gap: 12px;
+}
+
 .eyebrow {
     text-transform: uppercase;
     letter-spacing: 1px;

src/main/resources/static/js/downloads.js

@@ -0,0 +1,40 @@
+function detectPlatform() {
+    const navigatorPlatform = (navigator.userAgentData?.platform || navigator.platform || '').toLowerCase();
+    const userAgent = (navigator.userAgent || '').toLowerCase();
+    const platformString = `${navigatorPlatform} ${userAgent}`;
+
+    if (platformString.includes('mac') || platformString.includes('darwin')) {
+        return 'mac';
+    }
+    if (platformString.includes('win')) {
+        return 'windows';
+    }
+    if (platformString.includes('linux')) {
+        return 'linux';
+    }
+    return null;
+}
+
+function markRecommendedDownload(section) {
+    const cards = Array.from(section.querySelectorAll('.download-card'));
+    if (!cards.length) {
+        return;
+    }
+
+    const platform = detectPlatform();
+    const preferredCard = cards.find((card) => card.dataset.platform === platform) || cards[0];
+
+    cards.forEach((card) => {
+        const isPreferred = card === preferredCard;
+        card.classList.toggle('download-card--active', isPreferred);
+        const badge = card.querySelector('.recommended-badge');
+        if (badge) {
+            badge.classList.toggle('hidden', !isPreferred);
+        }
+    });
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+    const downloadSections = document.querySelectorAll('.download-section, .download-card-block');
+    downloadSections.forEach(markRecommendedDownload);
+});