diff --git a/lib/cortex_status_web/components/layouts/root.html.heex b/lib/cortex_status_web/components/layouts/root.html.heex
index 2a43f0a..6cb01a8 100644
--- a/lib/cortex_status_web/components/layouts/root.html.heex
+++ b/lib/cortex_status_web/components/layouts/root.html.heex
@@ -1236,6 +1236,237 @@
         text-align: center;
         color: var(--text-muted);
       }
+
+      /* Session detail modal */
+      .modal-backdrop {
+        position: fixed;
+        inset: 0;
+        background: rgba(0, 0, 0, 0.7);
+        backdrop-filter: blur(4px);
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        z-index: 1000;
+        padding: 2rem;
+        animation: fadeIn 0.15s ease-out;
+      }
+
+      @keyframes fadeIn {
+        from { opacity: 0; }
+        to { opacity: 1; }
+      }
+
+      .modal-content {
+        background: var(--surface);
+        border: 1px solid var(--border);
+        border-radius: 16px;
+        width: 100%;
+        max-width: 640px;
+        max-height: 80vh;
+        display: flex;
+        flex-direction: column;
+        animation: slideUp 0.2s ease-out;
+        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
+      }
+
+      @keyframes slideUp {
+        from { transform: translateY(20px); opacity: 0; }
+        to { transform: translateY(0); opacity: 1; }
+      }
+
+      .modal-header {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        padding: 1.25rem 1.5rem;
+        border-bottom: 1px solid var(--border);
+        flex-shrink: 0;
+      }
+
+      .modal-title-row {
+        display: flex;
+        align-items: center;
+        gap: 0.6rem;
+      }
+
+      .modal-close {
+        background: none;
+        border: none;
+        color: var(--text-muted);
+        font-size: 1.5rem;
+        cursor: pointer;
+        padding: 0.25rem 0.5rem;
+        border-radius: 6px;
+        line-height: 1;
+        transition: all 0.15s;
+      }
+
+      .modal-close:hover {
+        color: var(--text);
+        background: var(--surface-hover);
+      }
+
+      .modal-status-badge {
+        font-size: 0.7rem;
+        font-family: var(--mono);
+        padding: 0.15rem 0.5rem;
+        border-radius: 4px;
+        text-transform: uppercase;
+        letter-spacing: 0.04em;
+      }
+
+      .modal-status-completed { color: var(--green); background: var(--green-bg); }
+      .modal-status-active { color: var(--blue); background: var(--blue-bg); }
+      .modal-status-unknown { color: var(--text-muted); background: rgba(136, 144, 164, 0.1); }
+
+      .modal-body {
+        padding: 1.5rem;
+        overflow-y: auto;
+        flex: 1;
+      }
+
+      .modal-summary {
+        font-size: 1.1rem;
+        font-weight: 500;
+        line-height: 1.5;
+        margin-bottom: 1.25rem;
+      }
+
+      .modal-meta {
+        display: flex;
+        flex-wrap: wrap;
+        gap: 1rem 2rem;
+        margin-bottom: 1.25rem;
+        padding-bottom: 1.25rem;
+        border-bottom: 1px solid var(--border);
+      }
+
+      .meta-item {
+        display: flex;
+        flex-direction: column;
+        gap: 0.2rem;
+      }
+
+      .meta-label {
+        font-size: 0.7rem;
+        color: var(--text-muted);
+        text-transform: uppercase;
+        letter-spacing: 0.05em;
+      }
+
+      .meta-value {
+        font-size: 0.85rem;
+        color: var(--text);
+      }
+
+      .meta-value.mono {
+        font-family: var(--mono);
+        font-size: 0.8rem;
+      }
+
+      .modal-completion {
+        margin-bottom: 1.25rem;
+        padding: 1rem;
+        background: var(--green-bg);
+        border: 1px solid rgba(52, 211, 153, 0.2);
+        border-radius: 8px;
+      }
+
+      .completion-label {
+        font-size: 0.7rem;
+        color: var(--green);
+        text-transform: uppercase;
+        letter-spacing: 0.05em;
+        display: block;
+        margin-bottom: 0.4rem;
+      }
+
+      .completion-text {
+        font-size: 0.9rem;
+        line-height: 1.5;
+        color: var(--text);
+      }
+
+      .modal-logs-section {
+        margin-top: 0.5rem;
+      }
+
+      .logs-header {
+        font-size: 0.9rem;
+        font-weight: 600;
+        margin-bottom: 0.75rem;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+      }
+
+      .logs-count {
+        font-size: 0.75rem;
+        font-weight: 400;
+        color: var(--text-muted);
+        font-family: var(--mono);
+      }
+
+      .logs-loading {
+        padding: 1.5rem;
+        text-align: center;
+        color: var(--text-muted);
+        font-style: italic;
+      }
+
+      .logs-empty {
+        padding: 1.5rem;
+        text-align: center;
+        color: var(--text-muted);
+      }
+
+      .logs-timeline {
+        display: flex;
+        flex-direction: column;
+        gap: 0;
+        border-left: 2px solid var(--border);
+        margin-left: 0.5rem;
+        padding-left: 1rem;
+      }
+
+      .log-entry {
+        display: flex;
+        gap: 0.75rem;
+        padding: 0.5rem 0;
+        position: relative;
+      }
+
+      .log-entry::before {
+        content: '';
+        position: absolute;
+        left: -1.35rem;
+        top: 0.85rem;
+        width: 8px;
+        height: 8px;
+        border-radius: 50%;
+        background: var(--border);
+        border: 2px solid var(--surface);
+      }
+
+      .log-time {
+        font-size: 0.75rem;
+        font-family: var(--mono);
+        color: var(--text-muted);
+        flex-shrink: 0;
+        min-width: 3rem;
+        padding-top: 0.1rem;
+      }
+
+      .log-text {
+        font-size: 0.85rem;
+        line-height: 1.5;
+        color: var(--text);
+      }
+
+      /* Make session rows clickable */
+      .engram-session-row {
+        cursor: pointer;
+      }
     </style>
     <script defer phx-track-static type="text/javascript" src={"/assets/app.js"}></script>
   </head>
diff --git a/lib/cortex_status_web/live/status_live.ex b/lib/cortex_status_web/live/status_live.ex
index d40a107..66e248b 100644
--- a/lib/cortex_status_web/live/status_live.ex
+++ b/lib/cortex_status_web/live/status_live.ex
@@ -13,7 +13,14 @@ defmodule CortexStatusWeb.StatusLive do
 
     status = CortexStatus.Services.Monitor.get_status()
 
-    {:ok, assign(socket, status: status, page_title: "Cortex Status")}
+    {:ok,
+     assign(socket,
+       status: status,
+       page_title: "Cortex Status",
+       selected_session: nil,
+       session_logs: [],
+       modal_loading: false
+     )}
   end
 
   @impl true
@@ -21,6 +28,42 @@ defmodule CortexStatusWeb.StatusLive do
     {:noreply, assign(socket, status: new_status)}
   end
 
+  @impl true
+  def handle_event("select_session", %{"id" => session_id}, socket) do
+    # Find the session in our cached data
+    sessions = socket.assigns.status.engram.sessions
+    session = Enum.find(sessions, fn s -> get_val(s, "id", nil) == session_id end)
+
+    if session do
+      # Fetch logs async
+      send(self(), {:fetch_logs, session_id})
+      {:noreply, assign(socket, selected_session: session, session_logs: [], modal_loading: true)}
+    else
+      {:noreply, socket}
+    end
+  end
+
+  def handle_event("close_modal", _params, socket) do
+    {:noreply, assign(socket, selected_session: nil, session_logs: [], modal_loading: false)}
+  end
+
+  @impl true
+  def handle_info({:fetch_logs, session_id}, socket) do
+    config = Application.get_env(:cortex_status, :services, [])
+    url = Keyword.get(config, :symbiont_url, "http://127.0.0.1:8111")
+
+    logs =
+      case Req.get("#{url}/engram/sessions/#{session_id}/logs?limit=100", receive_timeout: 5_000) do
+        {:ok, %{status: 200, body: %{"logs" => logs}}} when is_list(logs) -> logs
+        _ -> []
+      end
+
+    # Sort logs oldest-first (they come newest-first from the API)
+    logs = Enum.reverse(logs)
+
+    {:noreply, assign(socket, session_logs: logs, modal_loading: false)}
+  end
+
   @impl true
   def render(assigns) do
     ~H"""
@@ -62,6 +105,14 @@ defmodule CortexStatusWeb.StatusLive do
 
       <.engram_section engram={@status.engram} />
 
+      <%= if @selected_session do %>
+        <.session_modal
+          session={@selected_session}
+          logs={@session_logs}
+          loading={@modal_loading}
+        />
+      <% end %>
+
       <footer class="status-footer">
         <p>Checks run every 15 seconds &bull;
           <a href="/dashboard">LiveDashboard</a>
@@ -113,7 +164,6 @@ defmodule CortexStatusWeb.StatusLive do
     stats = assigns.engram.stats
     sessions = assigns.engram.sessions
 
-    # Filter out test sessions and sort by started_at desc
     real_sessions =
       sessions
       |> Enum.reject(fn s -> get_val(s, "session_type", "") == "test" end)
@@ -156,11 +206,15 @@ defmodule CortexStatusWeb.StatusLive do
 
       <div class="engram-sessions">
         <%= for session <- @real_sessions do %>
-          <div class="engram-session-row">
+          <div
+            class="engram-session-row"
+            phx-click="select_session"
+            phx-value-id={get_val(session, "id", "")}
+          >
             <span class={"session-type-badge #{session_type_class(get_val(session, "session_type", ""))}"}>
               <%= get_val(session, "session_type", "?") %>
             </span>
-            <span class="session-summary"><%= get_val(session, "summary", "—") %></span>
+            <span class="session-summary"><%= get_val(session, "summary", "\u2014") %></span>
             <span class="session-date"><%= format_session_date(get_val(session, "started_at", "")) %></span>
           </div>
         <% end %>
@@ -172,6 +226,93 @@ defmodule CortexStatusWeb.StatusLive do
     """
   end
 
+  # ── Session Detail Modal ──
+
+  attr :session, :map, required: true
+  attr :logs, :list, required: true
+  attr :loading, :boolean, default: false
+
+  defp session_modal(assigns) do
+    session = assigns.session
+    status = get_val(session, "status", "unknown")
+    stype = get_val(session, "session_type", "?")
+
+    assigns =
+      assigns
+      |> assign(:status_val, status)
+      |> assign(:stype, stype)
+      |> assign(:summary, get_val(session, "summary", "\u2014"))
+      |> assign(:started, get_val(session, "started_at", ""))
+      |> assign(:completed, get_val(session, "completed_at", nil))
+      |> assign(:completion_summary, get_val(session, "completion_summary", nil))
+      |> assign(:session_id, get_val(session, "id", ""))
+
+    ~H"""
+    <div class="modal-backdrop" phx-click="close_modal">
+      <div class="modal-content" phx-click-away="close_modal">
+        <div class="modal-header">
+          <div class="modal-title-row">
+            <span class={"session-type-badge #{session_type_class(@stype)}"}><%= @stype %></span>
+            <span class={"modal-status-badge modal-status-#{@status_val}"}><%= @status_val %></span>
+          </div>
+          <button class="modal-close" phx-click="close_modal">&times;</button>
+        </div>
+
+        <div class="modal-body">
+          <h3 class="modal-summary"><%= @summary %></h3>
+
+          <div class="modal-meta">
+            <div class="meta-item">
+              <span class="meta-label">Session ID</span>
+              <span class="meta-value mono"><%= @session_id %></span>
+            </div>
+            <div class="meta-item">
+              <span class="meta-label">Started</span>
+              <span class="meta-value"><%= format_full_date(@started) %></span>
+            </div>
+            <%= if @completed do %>
+              <div class="meta-item">
+                <span class="meta-label">Completed</span>
+                <span class="meta-value"><%= format_full_date(@completed) %></span>
+              </div>
+            <% end %>
+          </div>
+
+          <%= if @completion_summary do %>
+            <div class="modal-completion">
+              <span class="completion-label">Outcome</span>
+              <p class="completion-text"><%= @completion_summary %></p>
+            </div>
+          <% end %>
+
+          <div class="modal-logs-section">
+            <h4 class="logs-header">
+              Activity Log
+              <span class="logs-count"><%= length(@logs) %> entries</span>
+            </h4>
+            <%= if @loading do %>
+              <div class="logs-loading">Loading...</div>
+            <% else %>
+              <%= if @logs == [] do %>
+                <p class="logs-empty">No log entries recorded for this session.</p>
+              <% else %>
+                <div class="logs-timeline">
+                  <%= for log <- @logs do %>
+                    <div class="log-entry">
+                      <span class="log-time"><%= format_log_time(get_val(log, "timestamp", "")) %></span>
+                      <span class="log-text"><%= get_val(log, "entry", "") %></span>
+                    </div>
+                  <% end %>
+                </div>
+              <% end %>
+            <% end %>
+          </div>
+        </div>
+      </div>
+    </div>
+    """
+  end
+
   # -- Helpers --
 
   defp overall_status(status) do
@@ -214,7 +355,7 @@ defmodule CortexStatusWeb.StatusLive do
     [
       {"CPU", "#{data[:cpu_load_1min]}%"},
       {"Memory", "#{data[:memory_used_mb]}MB / #{data[:memory_total_mb]}MB (#{data[:memory_percent]}%)"},
-      {"Uptime", data[:uptime_human] || "—"}
+      {"Uptime", data[:uptime_human] || "\u2014"}
     ]
   end
 
@@ -228,7 +369,7 @@ defmodule CortexStatusWeb.StatusLive do
     [
       {"Queue", "#{get_val(data, "queue_size", 0)} tasks"},
       {"Rate Limited", if(get_val(data, "rate_limited", false), do: "Yes", else: "No")},
-      {"Last Heartbeat", get_val(data, "last_heartbeat", "—")}
+      {"Last Heartbeat", get_val(data, "last_heartbeat", "\u2014")}
     ]
   end
 
@@ -261,7 +402,7 @@ defmodule CortexStatusWeb.StatusLive do
           :ok -> "#{latency}ms"
           :degraded -> "HTTP #{http_code}"
           :error -> to_string(error || "down")
-          _ -> "—"
+          _ -> "\u2014"
         end
 
       {name, status_str}
@@ -276,7 +417,7 @@ defmodule CortexStatusWeb.StatusLive do
 
   defp get_val(_not_map, _key, default), do: default
 
-  defp format_ago(nil), do: "—"
+  defp format_ago(nil), do: "\u2014"
 
   defp format_ago(%DateTime{} = dt) do
     diff = DateTime.diff(DateTime.utc_now(), dt, :second)
@@ -289,12 +430,11 @@ defmodule CortexStatusWeb.StatusLive do
     end
   end
 
-  defp format_ago(_), do: "—"
+  defp format_ago(_), do: "\u2014"
 
-  defp format_session_date(""), do: "—"
+  defp format_session_date(""), do: "\u2014"
 
   defp format_session_date(iso_str) when is_binary(iso_str) do
-    # Handle both "2026-03-23T12:00:00" and "2026-03-23T12:00:00Z"
     case DateTime.from_iso8601(iso_str) do
       {:ok, dt, _} -> format_relative_date(dt)
       _ ->
@@ -305,7 +445,7 @@ defmodule CortexStatusWeb.StatusLive do
     end
   end
 
-  defp format_session_date(_), do: "—"
+  defp format_session_date(_), do: "\u2014"
 
   defp format_relative_date(dt) do
     diff = DateTime.diff(DateTime.utc_now(), dt, :second)
@@ -315,8 +455,38 @@ defmodule CortexStatusWeb.StatusLive do
       days == 0 -> "today"
       days == 1 -> "yesterday"
       days < 7 -> "#{days}d ago"
-      true ->
-        Calendar.strftime(dt, "%b %d")
+      true -> Calendar.strftime(dt, "%b %d")
     end
   end
+
+  defp format_full_date(""), do: "\u2014"
+  defp format_full_date(nil), do: "\u2014"
+
+  defp format_full_date(iso_str) when is_binary(iso_str) do
+    case DateTime.from_iso8601(iso_str) do
+      {:ok, dt, _} -> Calendar.strftime(dt, "%b %d, %Y at %H:%M UTC")
+      _ ->
+        case NaiveDateTime.from_iso8601(iso_str) do
+          {:ok, ndt} -> Calendar.strftime(ndt, "%b %d, %Y at %H:%M")
+          _ -> iso_str
+        end
+    end
+  end
+
+  defp format_full_date(_), do: "\u2014"
+
+  defp format_log_time(""), do: ""
+
+  defp format_log_time(iso_str) when is_binary(iso_str) do
+    case DateTime.from_iso8601(iso_str) do
+      {:ok, dt, _} -> Calendar.strftime(dt, "%H:%M")
+      _ ->
+        case NaiveDateTime.from_iso8601(iso_str) do
+          {:ok, ndt} -> Calendar.strftime(ndt, "%H:%M")
+          _ -> ""
+        end
+    end
+  end
+
+  defp format_log_time(_), do: ""
 end