diff --git a/index.html b/index.html
index 0e5a030..6cba136 100644
--- a/index.html
+++ b/index.html
@@ -680,6 +680,51 @@
             margin: 0;
         }
 
+        /* ── Share banner ──────────────────────────────────── */
+        #share-banner {
+            position: fixed;
+            top: 52px;
+            left: 0; right: 0;
+            z-index: 15;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            gap: 8px;
+            padding: 7px 16px;
+            background: rgba(34,211,238,0.08);
+            border-bottom: 1px solid rgba(34,211,238,0.18);
+            font-size: 12px;
+            color: var(--accent);
+            backdrop-filter: blur(12px);
+            -webkit-backdrop-filter: blur(12px);
+        }
+        #share-banner[hidden] { display: none; }
+        .has-banner #graph-wrap { top: 88px; }
+        .has-banner #filter-bar { top: 96px; }
+
+        /* ── Edge delete button ─────────────────────────────── */
+        .conn-delete-btn {
+            flex-shrink: 0;
+            width: 20px; height: 20px;
+            border-radius: 5px;
+            background: transparent;
+            border: none;
+            cursor: pointer;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            color: var(--text3);
+            opacity: 0;
+            transition: opacity 0.15s, background 0.15s, color 0.15s;
+            padding: 0;
+            margin-left: auto;
+        }
+        .conn-item:hover .conn-delete-btn { opacity: 1; }
+        .conn-delete-btn:hover {
+            background: rgba(239,68,68,0.15);
+            color: #F87171;
+        }
+
         /* ── Edge label tooltip ────────────────────────────── */
         #edge-tooltip {
             position: fixed;
@@ -740,6 +785,13 @@
 </aside>
 <div class="overlay" id="overlay" aria-hidden="true"></div>
 
+<!-- Share banner (read-only mode) -->
+<div id="share-banner" hidden>
+    <i data-lucide="eye" style="width:13px;height:13px;stroke-width:1.75"></i>
+    <span>シェアビュー（読み取り専用）</span>
+    <button id="share-banner-own-btn" style="margin-left:12px;font-size:11px;padding:3px 10px;border-radius:8px;background:var(--accent-dim);border:1px solid rgba(34,211,238,0.3);color:var(--accent);cursor:pointer">自分のデータを開く</button>
+</div>
+
 <!-- Aurora -->
 <div class="aurora-bg" aria-hidden="true">
     <div class="aurora-blob aurora-blob-1"></div>
@@ -909,6 +961,9 @@
                 </button>
             </div>
         </div>
+        <div style="padding:8px 16px;font-size:11px;color:var(--text3);border-bottom:1px solid var(--border);line-height:1.6">
+            Claude や Gemini のチャットに貼り付けると、AI があなたの環境を即座に把握します
+        </div>
         <pre id="ai-context-text"></pre>
     </div>
 </div>
@@ -918,6 +973,9 @@
     <button class="tb-btn accent-btn" id="btn-ai" aria-label="AI Context を生成" title="AI Context">
         <i data-lucide="brain-circuit" style="width:17px;height:17px;stroke-width:1.5"></i>
     </button>
+    <button class="tb-btn" id="btn-share" aria-label="URLでシェア" title="URLでシェア">
+        <i data-lucide="share-2" style="width:16px;height:16px;stroke-width:1.75"></i>
+    </button>
     <div class="tb-divider"></div>
     <button class="tb-btn" id="btn-add-node" aria-label="ノードを追加" title="ノードを追加">
         <i data-lucide="plus" style="width:17px;height:17px;stroke-width:1.75"></i>
@@ -1017,6 +1075,9 @@ let hiddenTypes = new Set();
 let simulation = null;
 let svgZoom = null;
 let svgG = null;
+let isReadOnly = false;
+let currentSimNodes = [];
+let currentSimEdges = [];
 
 async function loadData() {
     const saved = localStorage.getItem(STORAGE_KEY);
@@ -1073,12 +1134,14 @@ function initGraph() {
 
     // Clone objects for simulation (D3 mutates them)
     const simNodes = nodes.map(n => ({ ...n }));
+    currentSimNodes = simNodes;
     const nodeMap = new Map(simNodes.map(n => [n.id, n]));
     const simEdges = edges.map(e => ({
         ...e,
         source: nodeMap.get(e.from) || e.from,
         target: nodeMap.get(e.to)   || e.to,
     }));
+    currentSimEdges = simEdges;
 
     // Simulation
     simulation = d3.forceSimulation(simNodes)
@@ -1272,11 +1335,16 @@ function showDetail(id, simNodes, simEdges) {
             const otherId = isOut ? e.to : e.from;
             const other = atlasData.nodes.find(n => n.id === otherId);
             const color = TYPE_COLORS[other?.type] || '#9CA3AF';
+            const delBtn = isReadOnly ? '' :
+                `<button class="conn-delete-btn" onclick="deleteEdge('${e.from}','${e.to}')" aria-label="接続を削除" title="削除">
+                    <svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
+                </button>`;
             return `<div class="conn-item">
                 <span class="conn-dot" style="background:${color}"></span>
                 <span>${other?.label || otherId}</span>
                 ${e.label ? `<span style="font-size:10px;color:var(--text3)">${e.label}</span>` : ''}
-                <span class="conn-dir">${isOut ? 'out' : 'in'}</span>
+                <span class="conn-dir" style="margin-left:auto;margin-right:4px">${isOut ? 'out' : 'in'}</span>
+                ${delBtn}
             </div>`;
         }).join('');
     }
@@ -1505,6 +1573,19 @@ function exportJson() {
 function bindEvents() {
     document.getElementById('btn-fit').addEventListener('click', fitGraph);
     document.getElementById('btn-add-node').addEventListener('click', openAddModal);
+    document.getElementById('btn-share').addEventListener('click', () => {
+        const url = generateShareURL();
+        navigator.clipboard.writeText(url)
+            .then(() => showToast('シェア URL をコピーしました'))
+            .catch(() => {
+                // Fallback: prompt
+                prompt('シェア URL をコピーしてください', url);
+            });
+    });
+    document.getElementById('share-banner-own-btn').addEventListener('click', () => {
+        history.replaceState(null, '', location.pathname);
+        location.reload();
+    });
     document.getElementById('btn-ai').addEventListener('click', () => {
         document.getElementById('ai-context-text').textContent = generateAIContext();
         openModal('ai-modal-overlay');
@@ -1591,6 +1672,52 @@ if ('serviceWorker' in navigator) {
     navigator.serviceWorker.register('/sw.js');
 }
 
+// ── URL Sharing ────────────────────────────────────────────────
+function generateShareURL() {
+    const json = JSON.stringify(atlasData);
+    const b64 = btoa(unescape(encodeURIComponent(json)));
+    return `${location.origin}${location.pathname}#atlas=${b64}`;
+}
+
+function checkShareURL() {
+    const hash = location.hash;
+    if (!hash.startsWith('#atlas=')) return false;
+    try {
+        const b64 = hash.slice(7);
+        const json = decodeURIComponent(escape(atob(b64)));
+        const data = JSON.parse(json);
+        if (!Array.isArray(data.nodes) || !Array.isArray(data.edges)) return false;
+        atlasData = data;
+        isReadOnly = true;
+        return true;
+    } catch (e) {
+        return false;
+    }
+}
+
+function applyReadOnly() {
+    const banner = document.getElementById('share-banner');
+    banner.removeAttribute('hidden');
+    document.body.classList.add('has-banner');
+    if (window.lucide) lucide.createIcons({ nodes: [banner] });
+    document.getElementById('btn-add-node').style.display = 'none';
+}
+
+// ── Edge delete ────────────────────────────────────────────────
+function deleteEdge(from, to) {
+    if (isReadOnly) return;
+    atlasData.edges = atlasData.edges.filter(e => !(e.from === from && e.to === to));
+    saveData();
+    const keepId = selectedNodeId;
+    initGraph();
+    if (keepId) {
+        selectedNodeId = keepId;
+        updateHighlight(currentSimNodes, currentSimEdges);
+        showDetail(keepId, currentSimNodes, currentSimEdges);
+    }
+    showToast('接続を削除しました');
+}
+
 // ── Wizard ─────────────────────────────────────────────────────
 function showWizard() {
     const overlay = document.getElementById('wizard-overlay');
@@ -1640,6 +1767,15 @@ function handleImportFile(file, isWizard) {
 // ── Init ───────────────────────────────────────────────────────
 loadData().then(() => {
     bindEvents();
+    // 1. Check for shared atlas in URL hash (read-only mode)
+    if (checkShareURL()) {
+        buildFilterBar();
+        initGraph();
+        applyReadOnly();
+        setTimeout(fitGraph, 800);
+        return;
+    }
+    // 2. Normal flow
     if (!atlasData) {
         showWizard();
     } else {