diff --git a/guarddog_nexus/web/static/app.js b/guarddog_nexus/web/static/app.js
index 00dd8db..ad0e65c 100644
--- a/guarddog_nexus/web/static/app.js
+++ b/guarddog_nexus/web/static/app.js
@@ -1,14 +1,45 @@
 // GuardDog Nexus — shared UI utilities
 
+document.addEventListener('DOMContentLoaded', function () {
+    document.querySelectorAll('th.sortable').forEach(function (th) {
+        th.setAttribute('tabindex', '0');
+        th.setAttribute('role', 'button');
+    });
+});
+
+document.addEventListener('keydown', function (e) {
+    if ((e.key === 'Enter' || e.key === ' ') && e.target.matches('th.sortable')) {
+        e.preventDefault();
+        e.target.click();
+    }
+});
+
 function copyCode(btn, codeId) {
     var el = document.getElementById(codeId);
     if (!el) return;
-    navigator.clipboard.writeText(el.textContent).then(function () {
-        btn.textContent = 'Copied!';
-        btn.classList.add('copied');
-        setTimeout(function () {
-            btn.textContent = 'Copy';
-            btn.classList.remove('copied');
-        }, 2000);
-    });
+    if (navigator.clipboard) {
+        navigator.clipboard.writeText(el.textContent).then(function () {
+            showCopied(btn);
+        });
+    } else {
+        // Fallback for non-HTTPS
+        var ta = document.createElement('textarea');
+        ta.value = el.textContent;
+        ta.style.position = 'fixed';
+        ta.style.left = '-9999px';
+        document.body.appendChild(ta);
+        ta.select();
+        document.execCommand('copy');
+        document.body.removeChild(ta);
+        showCopied(btn);
+    }
+}
+
+function showCopied(btn) {
+    btn.textContent = 'Copied!';
+    btn.classList.add('copied');
+    setTimeout(function () {
+        btn.textContent = 'Copy';
+        btn.classList.remove('copied');
+    }, 2000);
 }
diff --git a/guarddog_nexus/web/static/style.css b/guarddog_nexus/web/static/style.css
index 73c74ff..c2e1d2e 100644
--- a/guarddog_nexus/web/static/style.css
+++ b/guarddog_nexus/web/static/style.css
@@ -1,5 +1,7 @@
 /* GuardDog Nexus — Web UI styles */
 
+html { color-scheme: dark; }
+
 /* ------------------------------------------------------------------ */
 /* Status / severity colours                                           */
 /* ------------------------------------------------------------------ */
@@ -35,10 +37,16 @@
 /* ------------------------------------------------------------------ */
 /* Tables                                                             */
 /* ------------------------------------------------------------------ */
-table            { font-size: 0.9rem; }
+table            { font-size: 0.9rem; touch-action: manipulation; }
 table.compact    { font-size: 0.82rem; }
 table.compact th,
 table.compact td { padding: 0.35rem 0.5rem; }
+table td:first-child { font-variant-numeric: tabular-nums; }
+
+@media (prefers-reduced-motion: reduce) {
+    .spinner { animation: none; }
+    .status-scanning { animation: none; }
+}
 
 @media (max-width: 768px) {
     table { display: block; overflow-x: auto; white-space: nowrap; }
@@ -182,9 +190,14 @@ table.compact td { padding: 0.35rem 0.5rem; }
     font-size: 0.7rem;
     opacity: 0.5;
     cursor: pointer;
+    border: none;
     border-bottom: 1px dashed;
+    background: none;
+    padding: 0;
+    color: inherit;
 }
 .llm-retry:hover { opacity: 0.8; }
+.llm-retry:focus-visible { outline: 2px solid #2196f3; outline-offset: 2px; }
 
 .llm-disclaimer {
     margin-top: 0.6rem;
diff --git a/guarddog_nexus/web/templates/_llm_report_fragment.html b/guarddog_nexus/web/templates/_llm_report_fragment.html
index 06847b5..53875d6 100644
--- a/guarddog_nexus/web/templates/_llm_report_fragment.html
+++ b/guarddog_nexus/web/templates/_llm_report_fragment.html
@@ -5,11 +5,11 @@
         <span class="llm-severity">{{ report.severity_rating }}</span>
         {% endif %}
         {% if config.llm_enabled and not config.llm_auto_analyze %}
-        <span class="llm-retry"
+        <button class="llm-retry"
             hx-post="/api/v1/findings/{{ finding_id }}/analyze?retry=1"
             hx-target="closest .llm-report"
             hx-swap="outerHTML"
-            hx-indicator="closest .llm-report">{{ t('llm_retry', request.state.lang) }}</span>
+            hx-indicator="closest .llm-report">{{ t('llm_retry', request.state.lang) }}</button>
         {% endif %}
     </div>
     <p class="llm-summary">{{ report.summary }}</p>
diff --git a/guarddog_nexus/web/templates/_packages_table.html b/guarddog_nexus/web/templates/_packages_table.html
index 2f40565..10c596b 100644
--- a/guarddog_nexus/web/templates/_packages_table.html
+++ b/guarddog_nexus/web/templates/_packages_table.html
@@ -2,19 +2,19 @@
     <thead>
         <tr>
             <th class="sortable {% if sort_by == 'name' %}active{% endif %}" hx-get="/packages?page=1&flagged={{ flagged_filter }}&search={{ search }}&sort_by=name&sort_dir={% if sort_by == 'name' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#packages-table-container" hx-swap="innerHTML">
-                {{ t('col_name', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'name' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_name', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'name' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th>{{ t('col_version', request.state.lang) }}</th>
             <th>{{ t('col_ecosystem', request.state.lang) }}</th>
             <th>{{ t('col_repo', request.state.lang) }}</th>
             <th class="sortable {% if sort_by == 'flagged' %}active{% endif %}" hx-get="/packages?page=1&flagged={{ flagged_filter }}&search={{ search }}&sort_by=flagged&sort_dir={% if sort_by == 'flagged' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#packages-table-container" hx-swap="innerHTML">
-                {{ t('col_flagged', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'flagged' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_flagged', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'flagged' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th class="sortable {% if sort_by == 'total_findings' %}active{% endif %}" hx-get="/packages?page=1&flagged={{ flagged_filter }}&search={{ search }}&sort_by=total_findings&sort_dir={% if sort_by == 'total_findings' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#packages-table-container" hx-swap="innerHTML">
-                {{ t('col_findings', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'total_findings' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_findings', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'total_findings' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th class="sortable {% if sort_by == 'last_scanned_at' %}active{% endif %}" hx-get="/packages?page=1&flagged={{ flagged_filter }}&search={{ search }}&sort_by=last_scanned_at&sort_dir={% if sort_by == 'last_scanned_at' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#packages-table-container" hx-swap="innerHTML">
-                {{ t('col_last_scan', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'last_scanned_at' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_last_scan', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'last_scanned_at' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
         </tr>
     </thead>
diff --git a/guarddog_nexus/web/templates/_scans_table.html b/guarddog_nexus/web/templates/_scans_table.html
index 99f80f0..f8e182d 100644
--- a/guarddog_nexus/web/templates/_scans_table.html
+++ b/guarddog_nexus/web/templates/_scans_table.html
@@ -2,21 +2,21 @@
     <thead>
         <tr>
             <th class="sortable {% if sort_by == 'id' %}active{% endif %}" hx-get="/scans?page=1&flagged={{ flagged_filter }}&search={{ search }}&status={{ status_filter }}&sort_by=id&sort_dir={% if sort_by == 'id' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#scans-table-container" hx-swap="innerHTML">
-                {{ t('col_id', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'id' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_id', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'id' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th class="sortable {% if sort_by == 'package_name' %}active{% endif %}" hx-get="/scans?page=1&flagged={{ flagged_filter }}&search={{ search }}&status={{ status_filter }}&sort_by=package_name&sort_dir={% if sort_by == 'package_name' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#scans-table-container" hx-swap="innerHTML">
-                {{ t('col_package', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'package_name' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_package', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'package_name' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th>{{ t('col_version', request.state.lang) }}</th>
             <th>{{ t('col_repo', request.state.lang) }}</th>
             <th class="sortable {% if sort_by == 'status' %}active{% endif %}" hx-get="/scans?page=1&flagged={{ flagged_filter }}&search={{ search }}&status={{ status_filter }}&sort_by=status&sort_dir={% if sort_by == 'status' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#scans-table-container" hx-swap="innerHTML">
-                {{ t('col_status', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'status' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_status', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'status' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th class="sortable {% if sort_by == 'total_findings' %}active{% endif %}" hx-get="/scans?page=1&flagged={{ flagged_filter }}&search={{ search }}&status={{ status_filter }}&sort_by=total_findings&sort_dir={% if sort_by == 'total_findings' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#scans-table-container" hx-swap="innerHTML">
-                {{ t('col_findings', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'total_findings' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_findings', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'total_findings' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
             <th class="sortable {% if sort_by == 'started_at' %}active{% endif %}" hx-get="/scans?page=1&flagged={{ flagged_filter }}&search={{ search }}&status={{ status_filter }}&sort_by=started_at&sort_dir={% if sort_by == 'started_at' and sort_dir == 'asc' %}desc{% else %}asc{% endif %}" hx-target="#scans-table-container" hx-swap="innerHTML">
-                {{ t('col_time', request.state.lang) }} <span class="sort-icon">{% if sort_by == 'started_at' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
+                {{ t('col_time', request.state.lang) }} <span class="sort-icon" aria-hidden="true">{% if sort_by == 'started_at' %}{{ '▲' if sort_dir == 'asc' else '▼' }}{% else %}↕{% endif %}</span>
             </th>
         </tr>
     </thead>
diff --git a/guarddog_nexus/web/templates/base.html b/guarddog_nexus/web/templates/base.html
index 2790196..640866c 100644
--- a/guarddog_nexus/web/templates/base.html
+++ b/guarddog_nexus/web/templates/base.html
@@ -1,8 +1,9 @@
 <!DOCTYPE html>
-<html lang="en" data-theme="dark">
+<html lang="{{ request.state.lang }}" data-theme="dark">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="theme-color" content="#13171f">
     <title>{% block title %}GuardDog Nexus{% endblock %}</title>
     <link rel="stylesheet" href="/static/pico.min.css">
     <script src="/static/htmx.min.js"></script>
@@ -10,11 +11,11 @@
     <script src="/static/app.js"></script>
 </head>
 <body>
-    <main class="container">
+    <a href="#main-content" style="position:absolute;left:-9999px;top:0;z-index:999;padding:0.5rem 1rem;background:#2a3140;color:#fff;">Skip to content</a>
+    <main class="container" id="main-content">
         <nav class="sticky">
             <ul><li><strong><a href="/">{{ t('nav_dashboard', request.state.lang) }}</a></strong></li></ul>
             <ul>
-                <li><a href="/">{{ t('nav_dashboard', request.state.lang) }}</a></li>
                 <li><a href="/scans">{{ t('nav_scans', request.state.lang) }}</a></li>
                 <li><a href="/packages">{{ t('nav_packages', request.state.lang) }}</a></li>
                 <li style="margin-left: 1rem;">
diff --git a/guarddog_nexus/web/templates/dashboard_stats.html b/guarddog_nexus/web/templates/dashboard_stats.html
index 41759fe..4d538a4 100644
--- a/guarddog_nexus/web/templates/dashboard_stats.html
+++ b/guarddog_nexus/web/templates/dashboard_stats.html
@@ -1,5 +1,5 @@
 {% if total_findings %}
-<div style="display:flex; gap:1.5rem; padding:0.3rem 0; margin-bottom:1rem; border-bottom:1px solid var(--pico-color-gray-500); font-size:0.82rem; opacity:0.8; flex-wrap:wrap;">
+<div style="display:flex; gap:1.5rem; padding:0.3rem 0; margin-bottom:1rem; border-bottom:1px solid #2a3140; font-size:0.82rem; opacity:0.8; flex-wrap:wrap;">
     <span>{{ t('total_scans_label', request.state.lang) }}: <strong>{{ total_scans }}</strong></span>
     <span>{{ t('flagged_scans_label', request.state.lang) }}: <strong>{{ flagged_scans }}</strong></span>
     <span>{{ t('col_findings', request.state.lang) }}: <strong>{{ total_findings }}</strong></span>
diff --git a/guarddog_nexus/web/templates/package_detail.html b/guarddog_nexus/web/templates/package_detail.html
index 733365a..ac49fd5 100644
--- a/guarddog_nexus/web/templates/package_detail.html
+++ b/guarddog_nexus/web/templates/package_detail.html
@@ -64,11 +64,11 @@
                     <span class="llm-severity">{{ f.report.severity_rating }}</span>
                     {% endif %}
                     {% if config.llm_enabled and not config.llm_auto_analyze %}
-                    <span class="llm-retry"
+                    <button class="llm-retry"
                         hx-post="/api/v1/findings/{{ f.id }}/analyze?retry=1"
                         hx-target="closest .llm-report"
                         hx-swap="outerHTML"
-                        hx-indicator="closest .llm-report">{{ t('llm_retry', request.state.lang) }}</span>
+                        hx-indicator="closest .llm-report">{{ t('llm_retry', request.state.lang) }}</button>
                     {% endif %}
                 </div>
                 <p class="llm-summary">{{ f.report.summary }}</p>
diff --git a/guarddog_nexus/web/templates/packages_list.html b/guarddog_nexus/web/templates/packages_list.html
index 4635642..52be39f 100644
--- a/guarddog_nexus/web/templates/packages_list.html
+++ b/guarddog_nexus/web/templates/packages_list.html
@@ -12,7 +12,8 @@
 
 <div class="filter-bar">
     <input type="hidden" name="flagged" value="{{ flagged_filter }}">
-    <input type="text" name="search" placeholder="{{ t('filter_search', request.state.lang) }}" value="{{ search }}" hx-get="/packages" hx-trigger="input changed, keyup[entered] delay:300ms" hx-target="#packages-table-container" hx-swap="innerHTML" hx-include="[name=flagged]">
+    <label for="search-pkgs" style="display:none;">{{ t('filter_search', request.state.lang) }}</label>
+    <input type="search" id="search-pkgs" name="search" placeholder="{{ t('filter_search', request.state.lang) }}…" value="{{ search }}" hx-get="/packages" hx-trigger="input changed, keyup[entered] delay:300ms" hx-target="#packages-table-container" hx-swap="innerHTML" hx-include="[name=flagged]" autocomplete="off">
     <a href="?flagged={% if flagged_filter == '1' %}0{% else %}1{% endif %}" role="button" class="outline">
         {% if flagged_filter == '1' %}{{ t('btn_show_all', request.state.lang) }}{% else %}{{ t('btn_flagged_only', request.state.lang) }}{% endif %}
     </a>
diff --git a/guarddog_nexus/web/templates/scan_detail.html b/guarddog_nexus/web/templates/scan_detail.html
index 0d1b8dc..ce1cffd 100644
--- a/guarddog_nexus/web/templates/scan_detail.html
+++ b/guarddog_nexus/web/templates/scan_detail.html
@@ -60,11 +60,11 @@
                     <span class="llm-severity">{{ f.report.severity_rating }}</span>
                     {% endif %}
                     {% if config.llm_enabled and not config.llm_auto_analyze %}
-                    <span class="llm-retry"
+                    <button class="llm-retry"
                         hx-post="/api/v1/findings/{{ f.id }}/analyze?retry=1"
                         hx-target="closest .llm-report"
                         hx-swap="outerHTML"
-                        hx-indicator="closest .llm-report">{{ t('llm_retry', request.state.lang) }}</span>
+                        hx-indicator="closest .llm-report">{{ t('llm_retry', request.state.lang) }}</button>
                     {% endif %}
                 </div>
                 <p class="llm-summary">{{ f.report.summary }}</p>
diff --git a/guarddog_nexus/web/templates/scans_list.html b/guarddog_nexus/web/templates/scans_list.html
index 3d21c72..0de4cb9 100644
--- a/guarddog_nexus/web/templates/scans_list.html
+++ b/guarddog_nexus/web/templates/scans_list.html
@@ -12,7 +12,9 @@
 
 <div class="filter-bar">
     <input type="hidden" name="flagged" value="{{ flagged_filter }}">
-    <input type="text" name="search" placeholder="{{ t('filter_search', request.state.lang) }}" value="{{ search }}" hx-get="/scans" hx-trigger="input changed, keyup[entered] delay:300ms" hx-target="#scans-table-container" hx-swap="innerHTML" hx-include="#status-filter,[name=flagged]">
+    <label for="search-scans" style="display:none;">{{ t('filter_search', request.state.lang) }}</label>
+    <input type="search" id="search-scans" name="search" placeholder="{{ t('filter_search', request.state.lang) }}…" value="{{ search }}" hx-get="/scans" hx-trigger="input changed, keyup[entered] delay:300ms" hx-target="#scans-table-container" hx-swap="innerHTML" hx-include="#status-filter,[name=flagged]" autocomplete="off">
+    <label for="status-filter" style="display:none;">Status</label>
     <select name="status" id="status-filter" hx-get="/scans" hx-trigger="change" hx-target="#scans-table-container" hx-swap="innerHTML" hx-include="[name=search],[name=flagged]">
         <option value="">{{ t('filter_all_statuses', request.state.lang) }}</option>
         <option value="pending" {% if status_filter == 'pending' %}selected{% endif %}>{{ t('filter_pending', request.state.lang) }}</option>