diff --git a/index.html b/index.html
index f2bf0f2..224b215 100644
--- a/index.html
+++ b/index.html
@@ -30,157 +30,169 @@
     <link rel="stylesheet" href="https://posimai-ui.vercel.app/v1/base.css">
     <script src="https://unpkg.com/lucide@0.344.0/dist/umd/lucide.min.js"></script>
     <style>
-        /* ── Tab bar ── */
-        .tab-bar {
-            position: sticky;
-            top: 52px;
-            z-index: 90;
-            background: var(--bg);
-            border-bottom: 1px solid var(--border);
+        /* ── Layout ── */
+        :root {
+            --sidebar-w: 240px;
+        }
+        .app { display: flex; min-height: 100dvh; }
+
+        /* ── Sidebar ── */
+        .sidebar {
+            position: fixed;
+            top: 0; left: 0; bottom: 0;
+            width: var(--sidebar-w);
+            background: var(--sidebar-bg, rgba(13,13,13,0.92));
+            backdrop-filter: blur(20px);
+            -webkit-backdrop-filter: blur(20px);
+            border-right: 1px solid var(--border);
             display: flex;
-            padding: 0 16px;
+            flex-direction: column;
+            z-index: 200;
+            transform: translateX(-100%);
+            transition: transform .25s cubic-bezier(.4,0,.2,1);
         }
-        .tab-btn {
-            flex: none;
-            padding: 0 20px;
-            height: 40px;
-            font-size: 13px;
-            font-weight: 500;
-            color: var(--text2);
-            background: none;
-            border: none;
-            border-bottom: 2px solid transparent;
-            cursor: pointer;
-            transition: color 0.15s, border-color 0.15s;
-            letter-spacing: 0.01em;
+        .sidebar.open {
+            transform: translateX(0);
+            box-shadow: 0 8px 32px rgba(0,0,0,0.5);
+        }
+        @media (min-width: 768px) {
+            .sidebar { transform: translateX(0) !important; box-shadow: none !important; }
+        }
+
+        .sidebar-header {
+            height: 52px;
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+            padding: 0 10px 0 14px;
+            flex-shrink: 0;
+        }
+        .brand { display: flex; align-items: center; gap: 9px; }
+        .brand-logo {
+            width: 26px; height: 26px; border-radius: 7px; flex-shrink: 0;
+            display: flex; align-items: center; justify-content: center;
+            background: linear-gradient(135deg, #6EE7B7, #047857);
+        }
+        [data-theme="light"] .brand-logo { background: linear-gradient(135deg, #34D399, #059669); }
+        .brand-text { display: flex; flex-direction: column; }
+        .brand-name { font-size: 13px; font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; }
+        .brand-org { font-size: 10px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.1em; }
+
+        #closeSidebarBtn { display: flex; }
+        @media (min-width: 768px) { #closeSidebarBtn { display: none; } }
+
+        /* ── Sidebar nav ── */
+        .sidebar-nav { flex: 1; overflow-y: auto; padding: 2px 8px 0; }
+        .sidebar-nav::-webkit-scrollbar { width: 0; }
+
+        .nav-section-label {
+            font-size: 10px; font-weight: 600; color: var(--text3);
+            text-transform: uppercase; letter-spacing: 0.1em;
+            padding: 10px 8px 4px;
+            display: flex; align-items: center; justify-content: space-between;
+        }
+
+        .nav-item {
+            display: flex; align-items: center; gap: 8px;
+            padding: 8px 10px; min-height: 38px;
+            border-radius: 8px;
+            border: 1px solid transparent;
+            cursor: pointer; color: var(--text2); font-size: 13px; font-weight: 500;
+            transition: background .15s, color .15s, border-color .15s;
+            text-decoration: none; user-select: none;
+        }
+        .nav-item:hover { background: var(--surface2); color: var(--text); }
+        .nav-item.active {
+            background: color-mix(in srgb, var(--accent) 10%, transparent);
+            color: var(--accent);
+            border-color: color-mix(in srgb, var(--accent) 25%, transparent);
+        }
+        .nav-item svg { flex-shrink: 0; opacity: .75; }
+        .nav-item.active svg { opacity: 1; }
+        .nav-item-label { flex: 1; }
+        .nav-chevron { display: none; flex-shrink: 0; opacity: 0.5; }
+        .nav-item.active .nav-chevron { display: flex; }
+
+        .nav-count {
+            font-size: 11px; font-weight: 600; color: var(--text3);
+            background: var(--surface2); border-radius: 999px;
+            padding: 1px 7px; text-align: center; line-height: 1.6;
+        }
+        .nav-count.has-next {
+            background: color-mix(in srgb, var(--accent) 14%, transparent);
+            color: var(--accent);
+        }
+        .nav-item.active .nav-count { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
+
+        /* ── App search ── */
+        .app-search-wrap {
+            position: relative;
+            padding: 4px 8px 6px;
+        }
+        .app-search-icon {
+            position: absolute;
+            left: 18px; top: 50%; transform: translateY(-50%);
+            width: 12px; height: 12px;
+            color: var(--text3);
+            pointer-events: none;
+        }
+        .app-search {
+            width: 100%;
+            background: var(--surface2);
+            border: 1px solid var(--border);
+            border-radius: 7px;
+            color: var(--text);
+            font-size: 12px;
+            font-family: Inter, sans-serif;
+            padding: 6px 10px 6px 28px;
+            outline: none;
+            transition: border-color .12s;
+        }
+        .app-search::placeholder { color: var(--text3); }
+        .app-search:focus { border-color: var(--accent); }
+
+        /* ── Sidebar footer ── */
+        .sidebar-footer {
+            flex-shrink: 0;
+            padding: 8px 10px;
+            border-top: 1px solid var(--border);
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+            gap: 6px;
+        }
+        .sidebar-footer-label {
+            font-size: 11px; color: var(--text3);
+            white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
+        }
+
+        /* ── Sidebar overlay (mobile) ── */
+        #sidebarOverlay {
+            position: fixed; inset: 0;
+            background: rgba(0,0,0,0.55);
+            z-index: 150;
+            display: none;
+        }
+        #sidebarOverlay.open { display: block; }
+        @media (min-width: 768px) { #sidebarOverlay { display: none !important; } }
+
+        /* ── Main content ── */
+        .main {
+            flex: 1;
+            min-width: 0;
+            display: flex;
+            flex-direction: column;
+        }
+        @media (min-width: 768px) {
+            .main { margin-left: var(--sidebar-w); }
+            #menuBtn { display: none; }
         }
-        .tab-btn.active { color: var(--text); border-bottom-color: var(--accent); }
-        .tab-btn:hover:not(.active) { color: var(--text); }
 
         /* ── Views ── */
-        .view { display: none; }
+        .view { display: none; flex: 1; }
         .view.active { display: block; }
 
         /* ── Board ── */
-        .board {
-            display: flex;
-            gap: 12px;
-            padding: 16px;
-            min-height: calc(100dvh - 92px);
-            overflow-x: auto;
-            align-items: flex-start;
-        }
-        .col {
-            flex: 0 0 268px;
-            display: flex;
-            flex-direction: column;
-            gap: 8px;
-        }
-        @media (min-width: 1100px) { .col { flex: 1 1 0; min-width: 200px; } }
-
-        .col-header {
-            display: flex;
-            align-items: center;
-            gap: 6px;
-            padding: 0 2px 8px;
-            border-bottom: 1px solid var(--border);
-            margin-bottom: 2px;
-        }
-        .col-label {
-            font-size: 11px;
-            font-weight: 700;
-            text-transform: uppercase;
-            letter-spacing: 0.1em;
-            color: var(--text3);
-            flex: 1;
-        }
-        .col-count {
-            font-size: 11px;
-            font-weight: 600;
-            color: var(--text3);
-            background: var(--surface2);
-            border-radius: 99px;
-            padding: 1px 7px;
-        }
-        .col-next .col-label { color: var(--accent); }
-        .col-hold .col-label { color: #F59E0B; }
-
-        /* ── Task cards ── */
-        .task-card {
-            background: var(--surface);
-            border: 1px solid var(--border);
-            border-radius: var(--radius);
-            padding: 12px;
-            cursor: pointer;
-            transition: border-color 0.12s, transform 0.1s;
-            display: flex;
-            flex-direction: column;
-            gap: 5px;
-        }
-        .task-card:hover { border-color: var(--accent); transform: translateY(-1px); }
-        .task-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
-        .task-done { opacity: 0.45; }
-        .task-done:hover { opacity: 0.7; }
-        .task-app-chip {
-            font-size: 10px;
-            font-weight: 700;
-            color: var(--text3);
-            text-transform: uppercase;
-            letter-spacing: 0.07em;
-        }
-        .task-title {
-            font-size: 13px;
-            font-weight: 500;
-            color: var(--text);
-            line-height: 1.45;
-        }
-        .task-done .task-title { text-decoration: line-through; }
-        .task-note {
-            font-size: 11px;
-            color: var(--text3);
-            line-height: 1.4;
-            background: var(--surface2);
-            border-radius: 6px;
-            padding: 5px 8px;
-            border-left: 2px solid #F59E0B;
-        }
-        .task-meta {
-            display: flex;
-            align-items: center;
-            gap: 6px;
-            margin-top: 2px;
-        }
-        .task-by {
-            font-size: 10px;
-            font-weight: 600;
-            color: var(--text3);
-            background: var(--surface2);
-            border-radius: 99px;
-            padding: 1px 7px;
-        }
-        .task-date { font-size: 10px; color: var(--text3); margin-left: auto; }
-        .task-commit { font-size: 10px; color: var(--accent); font-family: monospace; text-decoration: none; }
-        .task-commit:hover { text-decoration: underline; }
-
-        .add-col-btn {
-            display: flex;
-            align-items: center;
-            justify-content: center;
-            gap: 5px;
-            width: 100%;
-            padding: 7px 12px;
-            background: none;
-            border: 1px dashed var(--border);
-            border-radius: var(--radius);
-            color: var(--text3);
-            font-size: 12px;
-            font-weight: 500;
-            cursor: pointer;
-            transition: border-color 0.12s, color 0.12s;
-        }
-        .add-col-btn:hover { border-color: var(--accent); color: var(--accent); }
-
-        /* ── Milestones bar ── */
         .milestones-bar {
             display: flex;
             flex-wrap: wrap;
@@ -199,490 +211,615 @@
             font-weight: 500;
             color: var(--text2);
         }
-        .milestone-target { font-size: 10px; color: var(--text3); }
+        .milestone-target { font-size: 10px; color: var(--text3); margin-left: 2px; }
 
-        /* ── Apps view ── */
-        #view-apps { padding: 16px; max-width: 800px; margin: 0 auto; }
-
-        .app-section {
-            margin-bottom: 6px;
-            background: var(--surface);
-            border: 1px solid var(--border);
-            border-radius: var(--radius);
-            overflow: hidden;
+        .board {
+            display: flex;
+            gap: 12px;
+            padding: 16px;
+            min-height: calc(100dvh - 52px);
+            overflow-x: auto;
+            align-items: flex-start;
         }
-        .app-section-header {
+        .col {
+            flex: 0 0 260px;
+            display: flex;
+            flex-direction: column;
+            gap: 8px;
+        }
+        @media (min-width: 1200px) { .col { flex: 1 1 0; min-width: 200px; } }
+
+        .col-header {
             display: flex;
             align-items: center;
-            padding: 11px 14px;
+            gap: 6px;
+            padding: 0 2px 8px;
+            border-bottom: 1px solid var(--border);
+            margin-bottom: 2px;
+        }
+        .col-label {
+            font-size: 11px;
+            font-weight: 700;
+            text-transform: uppercase;
+            letter-spacing: 0.1em;
+            color: var(--text3);
+            flex: 1;
+        }
+        .col-count {
+            font-size: 11px; font-weight: 600; color: var(--text3);
+            background: var(--surface2); border-radius: 99px; padding: 1px 7px;
+        }
+        .col-next .col-label { color: var(--accent); }
+        .col-hold .col-label { color: #F59E0B; }
+
+        /* ── Task cards (board) ── */
+        .task-card {
+            background: var(--surface);
+            border: 1px solid var(--border);
+            border-radius: 10px;
+            padding: 11px;
+            cursor: pointer;
+            transition: border-color .12s, transform .1s;
+            display: flex;
+            flex-direction: column;
+            gap: 5px;
+        }
+        .task-card:hover { border-color: var(--accent); transform: translateY(-1px); }
+        .task-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
+        .task-done { opacity: 0.45; }
+        .task-done:hover { opacity: 0.7; }
+        .task-app-chip {
+            font-size: 10px; font-weight: 700;
+            color: var(--text3); text-transform: uppercase; letter-spacing: 0.07em;
+        }
+        .task-title { font-size: 13px; font-weight: 500; color: var(--text); line-height: 1.45; }
+        .task-done .task-title { text-decoration: line-through; }
+        .task-hold-note {
+            font-size: 11px; color: var(--text3); line-height: 1.4;
+            background: var(--surface2); border-radius: 6px; padding: 5px 8px;
+            border-left: 2px solid #F59E0B;
+        }
+        .task-meta { display: flex; align-items: center; gap: 6px; margin-top: 2px; }
+        .task-by {
+            font-size: 10px; font-weight: 600; color: var(--text3);
+            background: var(--surface2); border-radius: 99px; padding: 1px 7px;
+        }
+        .task-date { font-size: 10px; color: var(--text3); margin-left: auto; }
+        .task-commit { font-size: 10px; color: var(--accent); font-family: monospace; text-decoration: none; }
+        .task-commit:hover { text-decoration: underline; }
+        .add-col-btn {
+            display: flex; align-items: center; justify-content: center; gap: 5px;
+            width: 100%; padding: 7px 12px;
+            background: none; border: 1px dashed var(--border); border-radius: 10px;
+            color: var(--text3); font-size: 12px; font-weight: 500;
+            cursor: pointer; transition: border-color .12s, color .12s;
+        }
+        .add-col-btn:hover { border-color: var(--accent); color: var(--accent); }
+        .empty-col { padding: 14px 8px; text-align: center; color: var(--text3); font-size: 12px; opacity: 0.7; }
+
+        /* ── App task view ── */
+        #view-app { max-width: 720px; margin: 0 auto; padding: 16px; }
+
+        .app-view-header {
+            display: flex;
+            align-items: center;
+            gap: 10px;
+            padding-bottom: 14px;
+            border-bottom: 1px solid var(--border);
+            margin-bottom: 16px;
+        }
+        .app-view-icon {
+            width: 32px; height: 32px; border-radius: 8px; flex-shrink: 0;
+            display: flex; align-items: center; justify-content: center;
+            background: color-mix(in srgb, var(--accent) 10%, transparent);
+            border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
+        }
+        .app-view-name {
+            font-size: 15px; font-weight: 600; color: var(--text); flex: 1;
+        }
+        .app-view-link {
+            font-size: 11px; color: var(--text3); text-decoration: none;
+        }
+        .app-view-link:hover { color: var(--accent); text-decoration: underline; }
+
+        .status-group { margin-bottom: 4px; }
+        .status-group-header {
+            display: flex;
+            align-items: center;
+            gap: 7px;
+            padding: 10px 0 8px;
             cursor: pointer;
-            gap: 8px;
             user-select: none;
         }
-        .app-section-header:hover { background: var(--surface2); }
-        .app-section-name { font-size: 13px; font-weight: 600; color: var(--text); flex: 1; }
-        .app-open-count {
-            font-size: 11px;
-            color: var(--text3);
-            background: var(--surface2);
-            border-radius: 99px;
-            padding: 1px 8px;
+        .status-group-label {
+            font-size: 11px; font-weight: 700;
+            text-transform: uppercase; letter-spacing: 0.09em;
+            color: var(--text3); flex: 1;
         }
-        .has-next { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
+        .sg-next .status-group-label { color: var(--accent); }
+        .sg-hold .status-group-label { color: #F59E0B; }
+        .status-group-count {
+            font-size: 11px; font-weight: 600;
+            color: var(--text3); background: var(--surface2);
+            border-radius: 99px; padding: 1px 7px;
+        }
+        .sg-next .status-group-count { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
+        .sg-hold .status-group-count { background: color-mix(in srgb, #F59E0B 12%, transparent); color: #F59E0B; }
 
-        .app-section-body { display: none; border-top: 1px solid var(--border); }
-        .app-section.open .app-section-body { display: block; }
+        .status-group-body { display: flex; flex-direction: column; gap: 4px; }
+        .status-group.collapsed .status-group-body { display: none; }
 
         .app-task-row {
             display: flex;
             align-items: flex-start;
             gap: 10px;
-            padding: 9px 14px;
-            border-bottom: 1px solid var(--border);
-        }
-        .app-task-row:last-child { border-bottom: none; }
-
-        .status-chip {
-            flex: 0 0 auto;
-            font-size: 10px;
-            font-weight: 700;
-            letter-spacing: 0.06em;
-            padding: 2px 8px;
-            border-radius: 99px;
-            margin-top: 2px;
-            text-transform: uppercase;
-        }
-        .chip-next { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
-        .chip-backlog { background: var(--surface2); color: var(--text3); }
-        .chip-hold { background: color-mix(in srgb, #F59E0B 12%, transparent); color: #F59E0B; }
-        .chip-done { background: var(--surface2); color: var(--text3); }
-
-        .app-task-content { flex: 1; min-width: 0; }
-        .app-task-title {
-            font-size: 13px;
-            color: var(--text);
-            line-height: 1.4;
+            padding: 10px 12px;
+            background: var(--surface);
+            border: 1px solid var(--border);
+            border-radius: 10px;
             cursor: pointer;
+            transition: border-color .12s;
         }
-        .app-task-title:hover { color: var(--accent); }
-        .app-task-done .app-task-title { text-decoration: line-through; opacity: 0.5; }
-        .app-task-note { font-size: 11px; color: var(--text3); margin-top: 3px; line-height: 1.4; }
+        .app-task-row:hover { border-color: var(--accent); }
+        .app-task-row:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
+        .app-task-done { opacity: 0.45; }
+        .app-task-done:hover { opacity: 0.7; }
 
-        .app-section-addbtn {
-            display: flex;
-            align-items: center;
-            gap: 5px;
-            padding: 8px 14px;
-            width: 100%;
-            background: none;
-            border: none;
-            color: var(--text3);
-            font-size: 12px;
-            cursor: pointer;
-            border-top: 1px solid var(--border);
-            transition: color 0.12s, background 0.12s;
+        .app-task-content { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 3px; }
+        .app-task-title { font-size: 13px; font-weight: 500; color: var(--text); line-height: 1.4; }
+        .app-task-done .app-task-title { text-decoration: line-through; }
+        .app-task-note {
+            font-size: 11px; color: var(--text3); line-height: 1.4;
+            background: var(--surface2); border-radius: 6px; padding: 4px 8px;
+            border-left: 2px solid #F59E0B; margin-top: 2px;
         }
-        .app-section-addbtn:hover { color: var(--accent); background: var(--surface2); }
+
+        .add-task-row-btn {
+            display: flex; align-items: center; gap: 5px;
+            width: 100%; padding: 7px 10px;
+            background: none; border: 1px dashed var(--border); border-radius: 10px;
+            color: var(--text3); font-size: 12px; cursor: pointer;
+            transition: border-color .12s, color .12s; margin-top: 4px;
+            font-family: Inter, sans-serif;
+        }
+        .add-task-row-btn:hover { border-color: var(--accent); color: var(--accent); }
+
+        .app-view-empty {
+            display: flex; flex-direction: column; align-items: center;
+            gap: 10px; padding: 48px 16px; color: var(--text3); text-align: center;
+        }
+        .app-view-empty svg { opacity: 0.3; }
 
         /* ── Ideas view ── */
         #view-ideas { padding: 16px; }
 
         .ideas-top {
-            display: flex;
-            align-items: center;
-            gap: 8px;
-            margin-bottom: 16px;
-            flex-wrap: wrap;
+            display: flex; align-items: center; gap: 8px;
+            margin-bottom: 16px; flex-wrap: wrap;
         }
         .idea-filter-btn {
-            padding: 5px 13px;
-            border-radius: 99px;
-            font-size: 12px;
-            font-weight: 500;
-            background: var(--surface);
-            border: 1px solid var(--border);
-            color: var(--text2);
-            cursor: pointer;
-            transition: all 0.12s;
+            padding: 5px 13px; border-radius: 99px; font-size: 12px; font-weight: 500;
+            background: var(--surface); border: 1px solid var(--border); color: var(--text2);
+            cursor: pointer; transition: all .12s;
         }
         .idea-filter-btn.active, .idea-filter-btn:hover {
             background: color-mix(in srgb, var(--accent) 12%, transparent);
-            border-color: var(--accent);
-            color: var(--accent);
-        }
-        .ideas-grid {
-            display: grid;
-            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
-            gap: 10px;
+            border-color: var(--accent); color: var(--accent);
         }
+        .ideas-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
         .idea-card {
-            background: var(--surface);
-            border: 1px solid var(--border);
-            border-radius: var(--radius);
-            padding: 14px;
-            cursor: pointer;
-            transition: border-color 0.12s;
-            display: flex;
-            flex-direction: column;
-            gap: 5px;
+            background: var(--surface); border: 1px solid var(--border);
+            border-radius: 10px; padding: 13px; cursor: pointer;
+            transition: border-color .12s; display: flex; flex-direction: column; gap: 5px;
         }
         .idea-card:hover { border-color: var(--accent); }
         .idea-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
         .idea-status-chip {
-            font-size: 10px;
-            font-weight: 700;
-            letter-spacing: 0.07em;
-            padding: 2px 8px;
-            border-radius: 99px;
-            align-self: flex-start;
+            font-size: 10px; font-weight: 700; letter-spacing: 0.07em;
+            padding: 2px 8px; border-radius: 99px; align-self: flex-start;
             text-transform: uppercase;
         }
         .i-exploring { background: color-mix(in srgb, #8B5CF6 14%, transparent); color: #8B5CF6; }
         .i-candidate { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
-        .i-approved   { background: color-mix(in srgb, #3B82F6 14%, transparent); color: #3B82F6; }
-        .i-archived   { background: var(--surface2); color: var(--text3); }
+        .i-approved  { background: color-mix(in srgb, #3B82F6 14%, transparent); color: #3B82F6; }
+        .i-archived  { background: var(--surface2); color: var(--text3); }
         .idea-title { font-size: 14px; font-weight: 600; color: var(--text); }
         .idea-desc  { font-size: 12px; color: var(--text2); line-height: 1.4; }
         .idea-note  { font-size: 11px; color: var(--text3); }
         .idea-meta  { display: flex; align-items: center; gap: 6px; margin-top: 4px; }
         .idea-by    { font-size: 10px; color: var(--text3); }
         .idea-date  { font-size: 10px; color: var(--text3); margin-left: auto; }
+        .ideas-empty {
+            grid-column: 1/-1; text-align: center;
+            padding: 56px 24px; color: var(--text3);
+        }
+        .ideas-empty svg { opacity: 0.3; display: block; margin: 0 auto 10px; }
 
         /* ── FAB ── */
         .fab {
             position: fixed;
             bottom: max(24px, env(safe-area-inset-bottom, 24px));
             right: 20px;
-            width: 48px;
-            height: 48px;
+            width: 48px; height: 48px;
             border-radius: 50%;
-            background: var(--accent);
-            color: #0D0D0D;
-            border: none;
-            cursor: pointer;
-            display: flex;
-            align-items: center;
-            justify-content: center;
+            background: var(--accent); color: #0D0D0D;
+            border: none; cursor: pointer;
+            display: flex; align-items: center; justify-content: center;
             box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 40%, transparent);
-            transition: transform 0.12s, box-shadow 0.12s;
+            transition: transform .12s, box-shadow .12s;
             z-index: 100;
         }
         .fab:hover { transform: scale(1.08); box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 50%, transparent); }
         .fab:active { transform: scale(0.96); }
 
-        /* ── Modal ── */
+        /* ── Modals ── */
         .modal-overlay {
-            position: fixed;
-            inset: 0;
+            position: fixed; inset: 0;
             background: rgba(0,0,0,0.65);
-            z-index: 200;
-            display: none;
-            align-items: center;
-            justify-content: center;
+            z-index: 400;
+            display: none; align-items: center; justify-content: center;
             padding: 20px;
         }
         .modal-overlay.open { display: flex; }
         .modal {
-            background: var(--surface);
-            border: 1px solid var(--border);
-            border-radius: 16px;
-            width: 100%;
-            max-width: 440px;
-            max-height: 90dvh;
-            overflow-y: auto;
-            display: flex;
-            flex-direction: column;
+            background: var(--surface); border: 1px solid var(--border);
+            border-radius: 16px; width: 100%; max-width: 440px;
+            max-height: 90dvh; overflow-y: auto;
+            display: flex; flex-direction: column;
         }
         .modal-header {
-            display: flex;
-            align-items: center;
-            padding: 16px 18px;
-            border-bottom: 1px solid var(--border);
-            gap: 8px;
-            position: sticky;
-            top: 0;
-            background: var(--surface);
+            display: flex; align-items: center;
+            padding: 15px 18px; border-bottom: 1px solid var(--border); gap: 8px;
+            position: sticky; top: 0; background: var(--surface);
         }
         .modal-title { font-size: 14px; font-weight: 600; flex: 1; }
         .modal-body { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
         .field-label {
-            font-size: 10px;
-            font-weight: 700;
-            color: var(--text3);
-            text-transform: uppercase;
-            letter-spacing: 0.08em;
-            margin-bottom: 5px;
+            font-size: 10px; font-weight: 700; color: var(--text3);
+            text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 5px;
         }
         .modal-body input[type="text"],
         .modal-body textarea,
         .modal-body select {
-            width: 100%;
-            background: var(--surface2);
-            border: 1px solid var(--border);
-            border-radius: 8px;
-            color: var(--text);
-            font-size: 13px;
-            font-family: Inter, sans-serif;
-            padding: 9px 12px;
-            box-sizing: border-box;
-            outline: none;
-            transition: border-color 0.12s;
+            width: 100%; background: var(--surface2); border: 1px solid var(--border);
+            border-radius: 8px; color: var(--text); font-size: 13px;
+            font-family: Inter, sans-serif; padding: 9px 12px;
+            box-sizing: border-box; outline: none; transition: border-color .12s;
         }
-        .modal-body input:focus,
-        .modal-body textarea:focus,
-        .modal-body select:focus { border-color: var(--accent); }
+        .modal-body input:focus, .modal-body textarea:focus, .modal-body select:focus { border-color: var(--accent); }
         .modal-body textarea { min-height: 72px; resize: vertical; }
         .modal-body select option { background: var(--surface); }
 
         .status-picker { display: flex; gap: 6px; flex-wrap: wrap; }
         .spick {
-            padding: 5px 13px;
-            border-radius: 99px;
-            font-size: 12px;
-            font-weight: 600;
-            cursor: pointer;
-            border: 1.5px solid var(--border);
-            background: none;
-            color: var(--text2);
-            transition: all 0.1s;
+            padding: 5px 13px; border-radius: 99px; font-size: 12px; font-weight: 600;
+            cursor: pointer; border: 1.5px solid var(--border);
+            background: none; color: var(--text2); transition: all .1s;
         }
-        .spick[data-s="next"].sel   { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
-        .spick[data-s="backlog"].sel { border-color: var(--text3); color: var(--text); background: var(--surface2); }
-        .spick[data-s="hold"].sel   { border-color: #F59E0B; color: #F59E0B; background: color-mix(in srgb, #F59E0B 12%, transparent); }
-        .spick[data-s="done"].sel   { border-color: var(--text3); color: var(--text3); background: var(--surface2); }
+        .spick[data-s="next"].sel    { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
+        .spick[data-s="backlog"].sel  { border-color: var(--text3); color: var(--text); background: var(--surface2); }
+        .spick[data-s="hold"].sel    { border-color: #F59E0B; color: #F59E0B; background: color-mix(in srgb, #F59E0B 12%, transparent); }
+        .spick[data-s="done"].sel    { border-color: var(--text3); color: var(--text3); background: var(--surface2); }
         .spick[data-s="exploring"].sel { border-color: #8B5CF6; color: #8B5CF6; background: color-mix(in srgb, #8B5CF6 12%, transparent); }
         .spick[data-s="candidate"].sel { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
         .spick[data-s="approved"].sel  { border-color: #3B82F6; color: #3B82F6; background: color-mix(in srgb, #3B82F6 12%, transparent); }
         .spick[data-s="archived"].sel  { border-color: var(--text3); color: var(--text3); background: var(--surface2); }
 
         .modal-footer {
-            display: flex;
-            gap: 8px;
+            display: flex; gap: 8px;
             padding: 12px 18px 18px;
             justify-content: flex-end;
         }
         .btn-danger {
-            margin-right: auto;
-            background: none;
-            border: 1px solid var(--border);
-            color: #EF4444;
-            font-size: 13px;
-            font-weight: 500;
-            padding: 8px 14px;
-            border-radius: 8px;
-            cursor: pointer;
+            margin-right: auto; background: none; border: 1px solid var(--border);
+            color: #EF4444; font-size: 13px; font-weight: 500;
+            padding: 8px 14px; border-radius: 8px; cursor: pointer;
         }
         .btn-danger:hover { border-color: #EF4444; background: color-mix(in srgb, #EF4444 10%, transparent); }
         .btn-primary {
-            background: var(--accent);
-            color: #0D0D0D;
-            font-size: 13px;
-            font-weight: 600;
-            padding: 8px 18px;
-            border-radius: 8px;
-            border: none;
-            cursor: pointer;
-            transition: opacity 0.12s;
+            background: var(--accent); color: #0D0D0D; font-size: 13px; font-weight: 600;
+            padding: 8px 18px; border-radius: 8px; border: none; cursor: pointer;
+            transition: opacity .12s;
         }
         .btn-primary:hover { opacity: 0.88; }
         .btn-secondary {
-            background: var(--surface2);
-            color: var(--text);
-            font-size: 13px;
-            font-weight: 500;
-            padding: 8px 14px;
-            border-radius: 8px;
-            border: 1px solid var(--border);
-            cursor: pointer;
+            background: var(--surface2); color: var(--text); font-size: 13px; font-weight: 500;
+            padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border); cursor: pointer;
         }
 
-        /* ── Settings additions ── */
+        /* ── Settings panel ── */
+        .settings-panel {
+            position: fixed; top: 0; right: 0; bottom: 0;
+            width: 280px; background: var(--surface);
+            border-left: 1px solid var(--border);
+            display: flex; flex-direction: column;
+            z-index: 300; transform: translateX(100%);
+            transition: transform .25s cubic-bezier(.4,0,.2,1);
+        }
+        .settings-panel.open { transform: translateX(0); box-shadow: 0 8px 32px rgba(0,0,0,0.5); }
+        .settings-panel-header {
+            height: 52px; display: flex; align-items: center; justify-content: space-between;
+            padding: 0 12px 0 16px; flex-shrink: 0; border-bottom: 1px solid var(--border);
+        }
+        .settings-panel-title { font-size: 14px; font-weight: 600; }
+        .settings-panel-body {
+            flex: 1; overflow-y: auto; padding: 16px;
+            display: flex; flex-direction: column; gap: 20px;
+        }
+        .settings-group-label {
+            font-size: 10px; font-weight: 600; color: var(--text3);
+            text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px;
+        }
+        .settings-item {
+            display: flex; align-items: center; justify-content: space-between;
+            gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--border);
+        }
+        .settings-item:last-child { border-bottom: none; }
+        .settings-item-label { font-size: 13px; color: var(--text); }
         .settings-action-btn {
-            display: flex;
-            align-items: center;
-            gap: 8px;
-            width: 100%;
-            padding: 9px 12px;
-            background: var(--surface2);
-            border: 1px solid var(--border);
-            border-radius: 8px;
-            color: var(--text);
-            font-size: 13px;
-            cursor: pointer;
-            margin-bottom: 6px;
-            font-family: Inter, sans-serif;
-            text-align: left;
-            transition: border-color 0.12s, color 0.12s;
+            display: flex; align-items: center; gap: 8px;
+            width: 100%; padding: 9px 12px;
+            background: var(--surface2); border: 1px solid var(--border); border-radius: 8px;
+            color: var(--text); font-size: 13px; cursor: pointer;
+            margin-bottom: 6px; font-family: Inter, sans-serif; text-align: left;
+            transition: border-color .12s, color .12s;
         }
         .settings-action-btn:hover { border-color: var(--accent); color: var(--accent); }
 
-        /* ── Empty states ── */
-        .empty-col { padding: 16px 8px; text-align: center; color: var(--text3); font-size: 12px; opacity: 0.7; }
-        .empty-grid {
-            grid-column: 1 / -1;
-            text-align: center;
-            padding: 60px 24px;
-            color: var(--text3);
+        .theme-selector { display: flex; gap: 4px; }
+        .theme-btn {
+            display: flex; align-items: center; gap: 4px;
+            padding: 5px 10px; border-radius: 7px; font-size: 12px; font-weight: 500;
+            background: var(--surface2); border: 1px solid var(--border); color: var(--text2);
+            cursor: pointer; font-family: Inter, sans-serif; transition: all .12s;
+        }
+        .theme-btn.active { background: color-mix(in srgb, var(--accent) 12%, transparent); border-color: var(--accent); color: var(--accent); }
+
+        /* ── Overlay (settings panel) ── */
+        .overlay {
+            position: fixed; inset: 0;
+            background: rgba(0,0,0,0.4);
+            z-index: 250; display: none;
+        }
+        .overlay.open { display: block; }
+
+        /* ── Misc ── */
+        .skip-link {
+            position: absolute; top: -100%; left: 8px;
+            background: var(--accent); color: #0D0D0D;
+            padding: 8px 16px; border-radius: 8px; font-weight: 600; font-size: 13px;
+            z-index: 10000; text-decoration: none;
+        }
+        .skip-link:focus { top: 8px; }
+
+        @media (prefers-reduced-motion: reduce) {
+            .sidebar, .settings-panel { transition: none; }
+            * { transition-duration: .01ms !important; }
         }
     </style>
 </head>
 <body>
-<a href="#main-content" class="skip-link" tabindex="0" style="position:absolute;top:-100%;left:8px;background:var(--accent);color:#0D0D0D;padding:8px 16px;border-radius:8px;font-weight:600;font-size:13px;z-index:10000;text-decoration:none">コンテンツへスキップ</a>
+<a href="#main-content" class="skip-link" tabindex="0">コンテンツへスキップ</a>
 
-<!-- Settings panel -->
-<aside class="settings-panel" id="settingsPanel" role="complementary">
-    <div class="settings-panel-header">
-        <span class="settings-panel-title">設定</span>
-        <button class="icon-btn" id="settingsCloseBtn" aria-label="設定を閉じる">
-            <i data-lucide="x" style="width:18px;height:18px;stroke-width:1.75"></i>
-        </button>
-    </div>
-    <div class="settings-panel-body">
-        <div>
-            <div class="settings-group-label">外観</div>
-            <div class="settings-item">
-                <div class="settings-item-label">テーマ</div>
-                <div class="theme-selector">
-                    <button class="theme-btn" data-theme-val="dark"><i data-lucide="moon" style="width:12px;height:12px;stroke-width:1.75"></i>ダーク</button>
-                    <button class="theme-btn" data-theme-val="light"><i data-lucide="sun" style="width:12px;height:12px;stroke-width:1.75"></i>ライト</button>
-                    <button class="theme-btn" data-theme-val="system"><i data-lucide="monitor" style="width:12px;height:12px;stroke-width:1.75"></i>自動</button>
+<div class="app">
+
+    <!-- ══ Sidebar ══════════════════════════════════════════════════════ -->
+    <aside class="sidebar" id="sidebar" aria-label="サイドバー">
+        <div class="sidebar-header">
+            <div class="brand">
+                <div class="brand-logo" aria-hidden="true">
+                    <i data-lucide="map" style="width:13px;height:13px;stroke-width:2;color:#0D0D0D"></i>
+                </div>
+                <div class="brand-text">
+                    <span class="brand-name">Roadmap</span>
+                    <span class="brand-org">Posimai</span>
                 </div>
             </div>
-        </div>
-        <div style="margin-top:16px;">
-            <div class="settings-group-label">データ</div>
-            <button class="settings-action-btn" id="exportJsonBtn">
-                <i data-lucide="copy" style="width:14px;height:14px;stroke-width:1.75"></i>
-                JSON をコピー（Claude 連携用）
-            </button>
-            <button class="settings-action-btn" id="reloadJsonBtn">
-                <i data-lucide="refresh-cw" style="width:14px;height:14px;stroke-width:1.75"></i>
-                ファイルから再読み込み
+            <button class="icon-btn" id="closeSidebarBtn" aria-label="閉じる">
+                <i data-lucide="x" style="width:15px;height:15px;stroke-width:2"></i>
             </button>
         </div>
-    </div>
-</aside>
-<div class="overlay" id="overlay" aria-hidden="true"></div>
 
-<header class="header">
-    <div class="header-brand">
-        <div class="header-dot" aria-hidden="true"></div>
-        <span class="header-title">Roadmap</span>
+        <nav class="sidebar-nav" aria-label="メインナビゲーション">
+            <div class="nav-section-label">ビュー</div>
+
+            <a class="nav-item active" data-nav="board" href="#" role="button">
+                <i data-lucide="layout-dashboard" style="width:15px;height:15px;stroke-width:1.75"></i>
+                <span class="nav-item-label">Board</span>
+                <i data-lucide="chevron-right" style="width:11px;height:11px;stroke-width:2.5" class="nav-chevron"></i>
+            </a>
+            <a class="nav-item" data-nav="ideas" href="#" role="button">
+                <i data-lucide="lightbulb" style="width:15px;height:15px;stroke-width:1.75"></i>
+                <span class="nav-item-label">Ideas</span>
+                <span class="nav-count" id="navCountIdeas">0</span>
+                <i data-lucide="chevron-right" style="width:11px;height:11px;stroke-width:2.5" class="nav-chevron"></i>
+            </a>
+
+            <div class="nav-section-label" style="margin-top:6px">
+                <span>アプリ</span>
+                <span class="nav-count" id="navCountOpen" style="font-size:10px"></span>
+            </div>
+
+            <div class="app-search-wrap">
+                <i data-lucide="search" class="app-search-icon"></i>
+                <input type="search" id="appSearch" class="app-search" placeholder="絞り込み..." aria-label="アプリを絞り込む">
+            </div>
+
+            <div id="appNavList" role="list"></div>
+        </nav>
+
+        <div class="sidebar-footer">
+            <span class="sidebar-footer-label" id="sidebarUpdatedLabel"></span>
+            <button class="icon-btn" id="settingsOpenBtn" aria-label="設定を開く" aria-expanded="false">
+                <i data-lucide="settings" style="width:15px;height:15px;stroke-width:1.75"></i>
+            </button>
+        </div>
+    </aside>
+
+    <!-- Sidebar overlay (mobile) -->
+    <div id="sidebarOverlay" aria-hidden="true"></div>
+
+    <!-- ══ Settings panel ════════════════════════════════════════════════ -->
+    <aside class="settings-panel" id="settingsPanel" role="dialog" aria-modal="true" aria-labelledby="settingsPanelTitle">
+        <div class="settings-panel-header">
+            <span class="settings-panel-title" id="settingsPanelTitle">設定</span>
+            <button class="icon-btn" id="settingsCloseBtn" aria-label="設定を閉じる">
+                <i data-lucide="x" style="width:15px;height:15px;stroke-width:2"></i>
+            </button>
+        </div>
+        <div class="settings-panel-body">
+            <div>
+                <div class="settings-group-label">外観</div>
+                <div class="settings-item">
+                    <span class="settings-item-label">テーマ</span>
+                    <div class="theme-selector">
+                        <button class="theme-btn" data-theme-val="dark">
+                            <i data-lucide="moon" style="width:11px;height:11px;stroke-width:1.75"></i>ダーク
+                        </button>
+                        <button class="theme-btn" data-theme-val="light">
+                            <i data-lucide="sun" style="width:11px;height:11px;stroke-width:1.75"></i>ライト
+                        </button>
+                        <button class="theme-btn" data-theme-val="system">
+                            <i data-lucide="monitor" style="width:11px;height:11px;stroke-width:1.75"></i>自動
+                        </button>
+                    </div>
+                </div>
+            </div>
+            <div>
+                <div class="settings-group-label">データ</div>
+                <button class="settings-action-btn" id="exportJsonBtn">
+                    <i data-lucide="copy" style="width:13px;height:13px;stroke-width:1.75"></i>
+                    JSON をコピー（Claude 連携用）
+                </button>
+                <button class="settings-action-btn" id="reloadJsonBtn">
+                    <i data-lucide="refresh-cw" style="width:13px;height:13px;stroke-width:1.75"></i>
+                    ファイルから再読み込み
+                </button>
+            </div>
+        </div>
+    </aside>
+    <div class="overlay" id="overlay" aria-hidden="true"></div>
+
+    <!-- ══ Main content ══════════════════════════════════════════════════ -->
+    <div class="main" id="main">
+        <header class="header">
+            <div class="header-brand">
+                <button class="icon-btn" id="menuBtn" aria-label="メニューを開く" aria-expanded="false" aria-controls="sidebar">
+                    <i data-lucide="menu" style="width:18px;height:18px;stroke-width:1.75"></i>
+                </button>
+                <div class="header-dot" aria-hidden="true"></div>
+                <span class="header-title" id="headerTitle">Board</span>
+            </div>
+            <button class="icon-btn" id="addHeaderBtn" aria-label="タスクを追加">
+                <i data-lucide="plus" style="width:18px;height:18px;stroke-width:2"></i>
+            </button>
+        </header>
+
+        <div id="view-board" class="view active" id="main-content" role="main" aria-label="Board"></div>
+        <div id="view-ideas" class="view" role="main" aria-label="Ideas"></div>
+        <div id="view-app"   class="view" role="main" aria-label="アプリタスク"></div>
     </div>
-    <button class="icon-btn" id="settingsBtn" aria-label="設定" aria-expanded="false">
-        <i data-lucide="settings" style="width:18px;height:18px;stroke-width:1.5"></i>
+
+    <!-- FAB -->
+    <button class="fab" id="fabBtn" aria-label="タスクを追加">
+        <i data-lucide="plus" style="width:22px;height:22px;stroke-width:2.5"></i>
     </button>
-</header>
 
-<div class="tab-bar" role="tablist">
-    <button class="tab-btn active" data-view="board" role="tab" aria-selected="true">Board</button>
-    <button class="tab-btn" data-view="apps" role="tab" aria-selected="false">Apps</button>
-    <button class="tab-btn" data-view="ideas" role="tab" aria-selected="false">Ideas</button>
-</div>
-
-<main id="main-content">
-    <div id="view-board" class="view active" role="tabpanel" aria-label="Board"></div>
-    <div id="view-apps"  class="view"        role="tabpanel" aria-label="Apps"></div>
-    <div id="view-ideas" class="view"        role="tabpanel" aria-label="Ideas"></div>
-</main>
-
-<button class="fab" id="fabBtn" aria-label="タスクを追加">
-    <i data-lucide="plus" style="width:22px;height:22px;stroke-width:2.5"></i>
-</button>
-
-<!-- Task modal -->
-<div class="modal-overlay" id="taskModal" role="dialog" aria-modal="true" aria-labelledby="taskModalTitle">
-    <div class="modal">
-        <div class="modal-header">
-            <span class="modal-title" id="taskModalTitle">タスクを追加</span>
-            <button class="icon-btn" id="taskModalClose" aria-label="閉じる">
-                <i data-lucide="x" style="width:16px;height:16px;stroke-width:1.75"></i>
-            </button>
-        </div>
-        <div class="modal-body">
-            <div>
-                <div class="field-label">タイトル</div>
-                <input type="text" id="fTitle" placeholder="タスクのタイトル...">
+    <!-- ══ Task modal ════════════════════════════════════════════════════ -->
+    <div class="modal-overlay" id="taskModal" role="dialog" aria-modal="true" aria-labelledby="taskModalTitle">
+        <div class="modal">
+            <div class="modal-header">
+                <span class="modal-title" id="taskModalTitle">タスクを追加</span>
+                <button class="icon-btn" id="taskModalClose" aria-label="閉じる">
+                    <i data-lucide="x" style="width:16px;height:16px;stroke-width:1.75"></i>
+                </button>
             </div>
-            <div>
-                <div class="field-label">アプリ</div>
-                <select id="fApp"></select>
-            </div>
-            <div>
-                <div class="field-label">ステータス</div>
-                <div class="status-picker" id="taskStatusPicker">
-                    <button class="spick" data-s="next">Next</button>
-                    <button class="spick" data-s="backlog">Backlog</button>
-                    <button class="spick" data-s="hold">Hold</button>
-                    <button class="spick" data-s="done">Done</button>
+            <div class="modal-body">
+                <div>
+                    <div class="field-label">タイトル</div>
+                    <input type="text" id="fTitle" placeholder="タスクのタイトル...">
+                </div>
+                <div>
+                    <div class="field-label">アプリ</div>
+                    <select id="fApp"></select>
+                </div>
+                <div>
+                    <div class="field-label">ステータス</div>
+                    <div class="status-picker" id="taskStatusPicker">
+                        <button class="spick" data-s="next">Next</button>
+                        <button class="spick" data-s="backlog">Backlog</button>
+                        <button class="spick" data-s="hold">Hold</button>
+                        <button class="spick" data-s="done">Done</button>
+                    </div>
+                </div>
+                <div>
+                    <div class="field-label">メモ / 保留の理由</div>
+                    <textarea id="fNote" placeholder="補足情報や保留の理由..."></textarea>
+                </div>
+                <div>
+                    <div class="field-label">担当</div>
+                    <select id="fBy"></select>
+                </div>
+                <div id="fCommitRow" style="display:none">
+                    <div class="field-label">Commit hash（任意）</div>
+                    <input type="text" id="fCommit" placeholder="例: e7ccd82">
                 </div>
             </div>
-            <div>
-                <div class="field-label">メモ / 保留の理由</div>
-                <textarea id="fNote" placeholder="補足情報や保留の理由..."></textarea>
+            <div class="modal-footer">
+                <button class="btn-danger" id="deleteTaskBtn" style="display:none">削除</button>
+                <button class="btn-secondary" id="taskModalCancel">キャンセル</button>
+                <button class="btn-primary" id="saveTaskBtn">保存</button>
             </div>
-            <div>
-                <div class="field-label">担当</div>
-                <select id="fBy"></select>
-            </div>
-            <div id="fCommitRow" style="display:none">
-                <div class="field-label">Commit hash（任意）</div>
-                <input type="text" id="fCommit" placeholder="例: e7ccd82">
-            </div>
-        </div>
-        <div class="modal-footer">
-            <button class="btn-danger" id="deleteTaskBtn" style="display:none">削除</button>
-            <button class="btn-secondary" id="taskModalCancel">キャンセル</button>
-            <button class="btn-primary" id="saveTaskBtn">保存</button>
         </div>
     </div>
-</div>
 
-<!-- Idea modal -->
-<div class="modal-overlay" id="ideaModal" role="dialog" aria-modal="true" aria-labelledby="ideaModalTitle">
-    <div class="modal">
-        <div class="modal-header">
-            <span class="modal-title" id="ideaModalTitle">アイデアを追加</span>
-            <button class="icon-btn" id="ideaModalClose" aria-label="閉じる">
-                <i data-lucide="x" style="width:16px;height:16px;stroke-width:1.75"></i>
-            </button>
-        </div>
-        <div class="modal-body">
-            <div>
-                <div class="field-label">タイトル</div>
-                <input type="text" id="iTitle" placeholder="例: posimai-finance">
+    <!-- ══ Idea modal ════════════════════════════════════════════════════ -->
+    <div class="modal-overlay" id="ideaModal" role="dialog" aria-modal="true" aria-labelledby="ideaModalTitle">
+        <div class="modal">
+            <div class="modal-header">
+                <span class="modal-title" id="ideaModalTitle">アイデアを追加</span>
+                <button class="icon-btn" id="ideaModalClose" aria-label="閉じる">
+                    <i data-lucide="x" style="width:16px;height:16px;stroke-width:1.75"></i>
+                </button>
             </div>
-            <div>
-                <div class="field-label">説明</div>
-                <input type="text" id="iDesc" placeholder="一行で説明">
-            </div>
-            <div>
-                <div class="field-label">ステータス</div>
-                <div class="status-picker" id="ideaStatusPicker">
-                    <button class="spick" data-s="exploring">Exploring</button>
-                    <button class="spick" data-s="candidate">Candidate</button>
-                    <button class="spick" data-s="approved">Approved</button>
-                    <button class="spick" data-s="archived">Archived</button>
+            <div class="modal-body">
+                <div>
+                    <div class="field-label">タイトル</div>
+                    <input type="text" id="iTitle" placeholder="例: posimai-finance">
+                </div>
+                <div>
+                    <div class="field-label">説明</div>
+                    <input type="text" id="iDesc" placeholder="一行で説明">
+                </div>
+                <div>
+                    <div class="field-label">ステータス</div>
+                    <div class="status-picker" id="ideaStatusPicker">
+                        <button class="spick" data-s="exploring">Exploring</button>
+                        <button class="spick" data-s="candidate">Candidate</button>
+                        <button class="spick" data-s="approved">Approved</button>
+                        <button class="spick" data-s="archived">Archived</button>
+                    </div>
+                </div>
+                <div>
+                    <div class="field-label">メモ</div>
+                    <textarea id="iNote" placeholder="補足情報..."></textarea>
                 </div>
             </div>
-            <div>
-                <div class="field-label">メモ</div>
-                <textarea id="iNote" placeholder="補足情報..."></textarea>
+            <div class="modal-footer">
+                <button class="btn-danger" id="deleteIdeaBtn" style="display:none">削除</button>
+                <button class="btn-secondary" id="ideaModalCancel">キャンセル</button>
+                <button class="btn-primary" id="saveIdeaBtn">保存</button>
             </div>
         </div>
-        <div class="modal-footer">
-            <button class="btn-danger" id="deleteIdeaBtn" style="display:none">削除</button>
-            <button class="btn-secondary" id="ideaModalCancel">キャンセル</button>
-            <button class="btn-primary" id="saveIdeaBtn">保存</button>
-        </div>
     </div>
-</div>
+
+</div><!-- .app -->
 
 <div id="toast" role="status" aria-live="polite"></div>
 
 <script src="https://posimai-ui.vercel.app/v1/base.js" defer></script>
 <script defer>
-// ── Constants ─────────────────────────────────────────────────────────────────
+// ── Constants ──────────────────────────────────────────────────────────────────
 const STORAGE_KEY = 'posimai-roadmap-data';
 const STATUSES = [
     { id: 'next',    label: 'Next',    icon: 'circle-arrow-right' },
@@ -693,17 +830,19 @@ const STATUSES = [
 const IDEA_STATUSES = ['exploring', 'candidate', 'approved', 'archived'];
 const IDEA_LABELS   = { exploring: 'Exploring', candidate: 'Candidate', approved: 'Approved', archived: 'Archived' };
 
-// ── State ─────────────────────────────────────────────────────────────────────
-let data            = null;
-let currentView     = 'board';
-let editTaskId      = null;
-let editTaskApp     = null;
-let editIdeaId      = null;
-let taskStatus      = 'next';
-let ideaStatus      = 'exploring';
-let ideaFilter      = 'all';
+// ── State ──────────────────────────────────────────────────────────────────────
+let data        = null;
+let currentView = 'board';  // 'board' | 'ideas' | 'app'
+let currentApp  = null;     // app id when view === 'app'
+let editTaskId  = null;
+let editTaskApp = null;
+let editIdeaId  = null;
+let taskStatus  = 'next';
+let ideaStatus  = 'exploring';
+let ideaFilter  = 'all';
+let appSearch   = '';
 
-// ── Data helpers ──────────────────────────────────────────────────────────────
+// ── Data helpers ───────────────────────────────────────────────────────────────
 async function loadData(forceFile = false) {
     if (!forceFile) {
         const raw = localStorage.getItem(STORAGE_KEY);
@@ -754,43 +893,103 @@ function pushTask(task, appId) {
 }
 
 function genId(prefix) { return `${prefix}-${Date.now().toString(36)}`; }
-
-// ── Render helpers ────────────────────────────────────────────────────────────
 function esc(s) {
     return String(s || '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
 }
-
 function shortName(appId) { return appId.replace('posimai-', ''); }
+function openCount(tasks) { return tasks.filter(t => t.status !== 'done').length; }
+function hasNext(tasks)   { return tasks.some(t => t.status === 'next'); }
 
-function taskCard(t) {
-    const done = t.status === 'done';
-    const note = (t.status === 'hold' && t.note)
-        ? `<div class="task-note">${esc(t.note)}</div>` : '';
-    const commit = t.commit
-        ? `<a class="task-commit" href="https://github.com/posimai/${t.appId}/commit/${t.commit}" target="_blank" rel="noopener">${t.commit.slice(0,7)}</a>` : '';
-    const date = (done && t.done_at) ? `<span class="task-date">${t.done_at}</span>` : '';
-    return `<div class="task-card${done?' task-done':''}" data-id="${t.id}" data-app="${t.appId}" role="button" tabindex="0" aria-label="${esc(t.title)}">
-        <div class="task-app-chip">${shortName(t.appId)}</div>
-        <div class="task-title">${esc(t.title)}</div>
-        ${note}
-        <div class="task-meta">
-            <span class="task-by">${esc(t.by||'mai')}</span>
-            ${date}${commit}
-        </div>
-    </div>`;
+// ── Sidebar nav ────────────────────────────────────────────────────────────────
+function renderAppNav() {
+    const q = appSearch.toLowerCase();
+    const allApps = [...data.apps, { id: 'global', tasks: data.global || [] }];
+    const filtered = q ? allApps.filter(a => a.id.toLowerCase().includes(q)) : allApps;
+
+    // Update total open count
+    const totalOpen = allApps.reduce((n, a) => n + openCount(a.tasks), 0);
+    document.getElementById('navCountOpen').textContent = totalOpen ? `${totalOpen} open` : '';
+
+    // Update ideas count
+    document.getElementById('navCountIdeas').textContent = (data.ideas || []).length;
+
+    // Updated label
+    const upd = document.getElementById('sidebarUpdatedLabel');
+    if (upd && data.updated) upd.textContent = `更新: ${data.updated}`;
+
+    let html = '';
+    for (const app of filtered) {
+        const open = openCount(app.tasks);
+        const hn   = hasNext(app.tasks);
+        const isActive = currentView === 'app' && currentApp === app.id;
+        const countHtml = open > 0
+            ? `<span class="nav-count${hn ? ' has-next' : ''}">${open}</span>`
+            : '';
+        html += `<a class="nav-item${isActive ? ' active' : ''}" data-nav="app" data-app-id="${app.id}" href="#" role="listitem">
+            <i data-lucide="${app.id === 'global' ? 'globe' : 'package'}" style="width:14px;height:14px;stroke-width:1.75"></i>
+            <span class="nav-item-label">${shortName(app.id)}</span>
+            ${countHtml}
+            <i data-lucide="chevron-right" style="width:11px;height:11px;stroke-width:2.5" class="nav-chevron"></i>
+        </a>`;
+    }
+    if (!filtered.length) {
+        html = '<div style="padding:8px 10px;font-size:12px;color:var(--text3);">該当なし</div>';
+    }
+    document.getElementById('appNavList').innerHTML = html;
+
+    // Update Board/Ideas nav active state
+    document.querySelectorAll('.nav-item[data-nav]').forEach(el => {
+        const nav = el.dataset.nav;
+        if (nav === 'board')  el.classList.toggle('active', currentView === 'board');
+        if (nav === 'ideas')  el.classList.toggle('active', currentView === 'ideas');
+    });
+
+    lucide.createIcons({ nodes: [document.getElementById('appNavList'), document.querySelector('.sidebar-nav')] });
 }
 
-// ── Board view ────────────────────────────────────────────────────────────────
+// ── Switch view ────────────────────────────────────────────────────────────────
+function switchView(view, appId) {
+    currentView = view;
+    currentApp  = appId || null;
+
+    // Header title
+    const titles = { board: 'Board', ideas: 'Ideas' };
+    const title = view === 'app' ? shortName(appId) : (titles[view] || view);
+    document.getElementById('headerTitle').textContent = title;
+
+    // FAB visibility
+    document.getElementById('fabBtn').style.display = view === 'ideas' ? 'none' : 'flex';
+
+    // Add header button aria-label
+    const addBtn = document.getElementById('addHeaderBtn');
+    addBtn.setAttribute('aria-label', view === 'ideas' ? 'アイデアを追加' : 'タスクを追加');
+
+    // Show correct view
+    document.getElementById('view-board').classList.toggle('active', view === 'board');
+    document.getElementById('view-ideas').classList.toggle('active', view === 'ideas');
+    document.getElementById('view-app').classList.toggle('active',   view === 'app');
+
+    renderAppNav();
+
+    if (view === 'app') renderAppView(appId);
+
+    // On mobile, close sidebar after navigation
+    closeSidebar();
+}
+
+// ── Board ──────────────────────────────────────────────────────────────────────
 function renderBoard() {
     const tasks = allTasks();
     const cutoff = new Date(); cutoff.setDate(cutoff.getDate() - 30);
-
     let html = '';
 
     if (data.milestones?.length) {
         html += '<div class="milestones-bar">';
         for (const ms of data.milestones) {
-            html += `<span class="milestone-chip"><i data-lucide="flag" style="width:11px;height:11px;stroke-width:2;opacity:.6"></i>${esc(ms.title)}<span class="milestone-target">${ms.target}</span></span>`;
+            html += `<span class="milestone-chip">
+                <i data-lucide="flag" style="width:11px;height:11px;stroke-width:2;opacity:.6"></i>
+                ${esc(ms.title)}<span class="milestone-target">${ms.target}</span>
+            </span>`;
         }
         html += '</div>';
     }
@@ -802,14 +1001,16 @@ function renderBoard() {
             col = col.filter(t => !t.done_at || new Date(t.done_at) >= cutoff).slice(0, 12);
         }
         const addBtn = st.id !== 'done'
-            ? `<button class="add-col-btn" data-add-status="${st.id}"><i data-lucide="plus" style="width:12px;height:12px;stroke-width:2.5"></i>追加</button>` : '';
+            ? `<button class="add-col-btn" data-add-status="${st.id}">
+                <i data-lucide="plus" style="width:12px;height:12px;stroke-width:2.5"></i>追加
+               </button>` : '';
         html += `<div class="col col-${st.id}">
             <div class="col-header">
                 <i data-lucide="${st.icon}" style="width:13px;height:13px;stroke-width:2;opacity:.55"></i>
                 <span class="col-label">${st.label}</span>
                 <span class="col-count">${col.length}</span>
             </div>
-            ${col.length ? col.map(taskCard).join('') : '<div class="empty-col">なし</div>'}
+            ${col.length ? col.map(boardCard).join('') : '<div class="empty-col">なし</div>'}
             ${addBtn}
         </div>`;
     }
@@ -817,42 +1018,73 @@ function renderBoard() {
     document.getElementById('view-board').innerHTML = html;
 }
 
-// ── Apps view ─────────────────────────────────────────────────────────────────
-function renderApps() {
-    const sections = [...data.apps, { id: 'global', tasks: data.global || [] }];
+function boardCard(t) {
+    const done = t.status === 'done';
+    const note = (t.status === 'hold' && t.note)
+        ? `<div class="task-hold-note">${esc(t.note)}</div>` : '';
+    const commit = t.commit
+        ? `<a class="task-commit" href="https://github.com/posimai/${t.appId}/commit/${t.commit}" target="_blank" rel="noopener">${t.commit.slice(0,7)}</a>` : '';
+    const date = (done && t.done_at) ? `<span class="task-date">${t.done_at}</span>` : '';
+    return `<div class="task-card${done?' task-done':''}" data-id="${t.id}" data-app="${t.appId}" role="button" tabindex="0">
+        <div class="task-app-chip">${shortName(t.appId)}</div>
+        <div class="task-title">${esc(t.title)}</div>
+        ${note}
+        <div class="task-meta">
+            <span class="task-by">${esc(t.by||'mai')}</span>
+            ${date}${commit}
+        </div>
+    </div>`;
+}
+
+// ── App task view ──────────────────────────────────────────────────────────────
+function renderAppView(appId) {
+    const appEntry = appId === 'global'
+        ? { id: 'global', tasks: data.global || [] }
+        : data.apps.find(a => a.id === appId);
+    if (!appEntry) { document.getElementById('view-app').innerHTML = ''; return; }
+
     const statusOrder = { next: 0, backlog: 1, hold: 2, done: 3 };
-    let html = '';
+    const sorted = [...appEntry.tasks].sort((a, b) => (statusOrder[a.status]??9) - (statusOrder[b.status]??9));
 
-    for (const app of sections) {
-        const open  = app.tasks.filter(t => t.status !== 'done');
-        const hasNext = open.some(t => t.status === 'next');
-        const autoOpen = hasNext || open.length > 0;
-        const icon = app.id === 'global' ? 'globe' : 'package';
+    let html = `<div class="app-view-header">
+        <div class="app-view-icon">
+            <i data-lucide="${appId === 'global' ? 'globe' : 'package'}" style="width:15px;height:15px;stroke-width:1.75;color:var(--accent)"></i>
+        </div>
+        <span class="app-view-name">${shortName(appId)}</span>`;
+    if (appId !== 'global') {
+        html += `<a class="app-view-link" href="https://${appId}.vercel.app" target="_blank" rel="noopener">${appId}.vercel.app</a>`;
+    }
+    html += '</div>';
 
-        html += `<div class="app-section${autoOpen?' open':''}" data-section="${app.id}">
-            <div class="app-section-header">
-                <i data-lucide="${icon}" style="width:14px;height:14px;stroke-width:1.75;opacity:.45"></i>
-                <span class="app-section-name">${shortName(app.id)}</span>
-                <span class="app-open-count${hasNext?' has-next':''}">${open.length} open</span>
-                <i data-lucide="chevron-down" style="width:14px;height:14px;stroke-width:1.75;opacity:.35"></i>
+    let anyTask = false;
+    for (const st of STATUSES) {
+        const tasks = sorted.filter(t => t.status === st.id);
+        if (st.id !== 'done' && tasks.length === 0) continue;
+        anyTask = true;
+
+        const collapsed = st.id === 'done' && tasks.length > 0 ? ' collapsed' : '';
+        html += `<div class="status-group sg-${st.id}${collapsed}" data-sg="${st.id}">
+            <div class="status-group-header">
+                <i data-lucide="${st.icon}" style="width:13px;height:13px;stroke-width:2;opacity:.6"></i>
+                <span class="status-group-label">${st.label}</span>
+                <span class="status-group-count">${tasks.length}</span>
+                <i data-lucide="chevron-down" style="width:13px;height:13px;stroke-width:2;opacity:.4" class="sg-chevron"></i>
             </div>
-            <div class="app-section-body">`;
+            <div class="status-group-body">`;
 
-        const sorted = [...app.tasks].sort((a, b) => (statusOrder[a.status]??9) - (statusOrder[b.status]??9));
-
-        if (!sorted.length) {
-            html += '<div style="padding:10px 14px;font-size:12px;color:var(--text3);">タスクなし</div>';
+        if (!tasks.length) {
+            html += `<div style="padding:6px 0;font-size:12px;color:var(--text3)">なし</div>`;
         }
-        for (const t of sorted) {
+        for (const t of tasks) {
+            const done   = t.status === 'done';
             const note   = t.note ? `<div class="app-task-note">${esc(t.note)}</div>` : '';
             const commit = t.commit
-                ? `<a class="task-commit" href="https://github.com/posimai/${app.id}/commit/${t.commit}" target="_blank" rel="noopener">${t.commit.slice(0,7)}</a>` : '';
-            html += `<div class="app-task-row${t.status==='done'?' app-task-done':''}">
-                <span class="status-chip chip-${t.status}">${t.status}</span>
+                ? `<a class="task-commit" href="https://github.com/posimai/${appId}/commit/${t.commit}" target="_blank" rel="noopener">${t.commit.slice(0,7)}</a>` : '';
+            html += `<div class="app-task-row${done?' app-task-done':''}" data-id="${t.id}" data-app="${appId}" role="button" tabindex="0">
                 <div class="app-task-content">
-                    <div class="app-task-title" data-id="${t.id}" data-app="${app.id}" role="button" tabindex="0">${esc(t.title)}</div>
+                    <div class="app-task-title">${esc(t.title)}</div>
                     ${note}
-                    <div class="task-meta" style="margin-top:4px">
+                    <div class="task-meta" style="margin-top:3px">
                         <span class="task-by">${esc(t.by||'mai')}</span>
                         ${t.done_at?`<span class="task-date">${t.done_at}</span>`:''}
                         ${commit}
@@ -861,15 +1093,28 @@ function renderApps() {
             </div>`;
         }
 
-        html += `<button class="app-section-addbtn" data-add-status="next" data-add-app="${app.id}">
-            <i data-lucide="plus" style="width:12px;height:12px;stroke-width:2.5"></i>タスクを追加
-        </button></div></div>`;
+        if (st.id !== 'done') {
+            html += `<button class="add-task-row-btn" data-add-status="${st.id}" data-add-app="${appId}">
+                <i data-lucide="plus" style="width:12px;height:12px;stroke-width:2.5"></i>タスクを追加
+            </button>`;
+        }
+        html += '</div></div>';
     }
 
-    document.getElementById('view-apps').innerHTML = html;
+    if (!anyTask) {
+        html += `<div class="app-view-empty">
+            <i data-lucide="inbox" style="width:32px;height:32px;stroke-width:1.25"></i>
+            <div style="font-size:13px;color:var(--text2)">タスクなし</div>
+            <button class="add-task-row-btn" data-add-status="next" data-add-app="${appId}" style="max-width:200px">
+                <i data-lucide="plus" style="width:12px;height:12px;stroke-width:2.5"></i>最初のタスクを追加
+            </button>
+        </div>`;
+    }
+
+    document.getElementById('view-app').innerHTML = html;
 }
 
-// ── Ideas view ────────────────────────────────────────────────────────────────
+// ── Ideas ──────────────────────────────────────────────────────────────────────
 function renderIdeas() {
     const ideas = data.ideas || [];
     const counts = {};
@@ -888,9 +1133,9 @@ function renderIdeas() {
     html += '<div class="ideas-grid">';
 
     if (!filtered.length) {
-        html += `<div class="empty-grid">
-            <i data-lucide="lightbulb" style="width:28px;height:28px;stroke-width:1.25;margin-bottom:8px;display:block;margin-inline:auto;opacity:.3"></i>
-            <div style="font-size:13px;">アイデアなし</div>
+        html += `<div class="ideas-empty">
+            <i data-lucide="lightbulb" style="width:28px;height:28px;stroke-width:1.25"></i>
+            <div style="font-size:13px">アイデアなし</div>
         </div>`;
     }
     for (const idea of filtered) {
@@ -911,26 +1156,13 @@ function renderIdeas() {
 
 function renderAll() {
     renderBoard();
-    renderApps();
     renderIdeas();
+    renderAppNav();
+    if (currentView === 'app' && currentApp) renderAppView(currentApp);
     lucide.createIcons();
 }
 
-// ── View switching ────────────────────────────────────────────────────────────
-function switchView(v) {
-    currentView = v;
-    document.querySelectorAll('.tab-btn').forEach(b => {
-        const on = b.dataset.view === v;
-        b.classList.toggle('active', on);
-        b.setAttribute('aria-selected', on);
-    });
-    document.querySelectorAll('.view').forEach(el => {
-        el.classList.toggle('active', el.id === `view-${v}`);
-    });
-    document.getElementById('fabBtn').style.display = v === 'ideas' ? 'none' : 'flex';
-}
-
-// ── Task modal ────────────────────────────────────────────────────────────────
+// ── Status picker ──────────────────────────────────────────────────────────────
 function pickStatus(s, pickerId) {
     if (pickerId === 'taskStatusPicker') taskStatus = s;
     else ideaStatus = s;
@@ -942,11 +1174,11 @@ function pickStatus(s, pickerId) {
     }
 }
 
+// ── Task modal ─────────────────────────────────────────────────────────────────
 function openTaskModal({ taskId, appId, defaultStatus, defaultApp } = {}) {
     editTaskId  = taskId  || null;
     editTaskApp = appId   || null;
 
-    // Populate selects
     const fApp = document.getElementById('fApp');
     fApp.innerHTML = '<option value="global">global</option>';
     for (const app of data.apps) {
@@ -959,9 +1191,9 @@ function openTaskModal({ taskId, appId, defaultStatus, defaultApp } = {}) {
         const t = findTask(taskId, appId);
         if (!t) return;
         document.getElementById('taskModalTitle').textContent = 'タスクを編集';
-        document.getElementById('fTitle').value   = t.title;
-        document.getElementById('fNote').value    = t.note  || '';
-        document.getElementById('fCommit').value  = t.commit || '';
+        document.getElementById('fTitle').value  = t.title;
+        document.getElementById('fNote').value   = t.note  || '';
+        document.getElementById('fCommit').value = t.commit || '';
         fApp.value = appId;
         fBy.value  = t.by || 'mai';
         pickStatus(t.status, 'taskStatusPicker');
@@ -971,11 +1203,10 @@ function openTaskModal({ taskId, appId, defaultStatus, defaultApp } = {}) {
         document.getElementById('fTitle').value  = '';
         document.getElementById('fNote').value   = '';
         document.getElementById('fCommit').value = '';
-        fApp.value = defaultApp || 'global';
+        fApp.value = defaultApp || (currentApp && currentApp !== 'global' ? currentApp : 'global');
         pickStatus(defaultStatus || 'next', 'taskStatusPicker');
         document.getElementById('deleteTaskBtn').style.display = 'none';
     }
-
     document.getElementById('taskModal').classList.add('open');
     document.getElementById('fTitle').focus();
 }
@@ -998,29 +1229,18 @@ function saveTask() {
     if (editTaskId) {
         const t = findTask(editTaskId, editTaskApp);
         if (!t) return;
-        t.title  = title;
-        t.note   = note;
-        t.by     = by;
-        t.commit = commit;
+        t.title  = title; t.note = note; t.by = by; t.commit = commit;
         if (t.status !== taskStatus) {
-            t.status  = taskStatus;
+            t.status = taskStatus;
             if (taskStatus === 'done' && !t.done_at) t.done_at = today;
         }
-        // Move app if changed
-        if (editTaskApp !== appId) {
-            removeTask(editTaskId, editTaskApp);
-            pushTask({ ...t }, appId);
-        }
+        if (editTaskApp !== appId) { removeTask(editTaskId, editTaskApp); pushTask({ ...t }, appId); }
     } else {
         pushTask({
-            id:      genId(shortName(appId)),
-            title, status: taskStatus, note, by,
-            created: today,
-            commit,
-            done_at: taskStatus === 'done' ? today : null,
+            id: genId(shortName(appId)), title, status: taskStatus, note, by,
+            created: today, commit, done_at: taskStatus === 'done' ? today : null,
         }, appId);
     }
-
     persist(); closeTaskModal(); renderAll();
     showToast(editTaskId ? '更新しました' : '追加しました');
 }
@@ -1032,7 +1252,7 @@ function deleteTask() {
     showToast('削除しました');
 }
 
-// ── Idea modal ────────────────────────────────────────────────────────────────
+// ── Idea modal ─────────────────────────────────────────────────────────────────
 function openIdeaModal(ideaId) {
     editIdeaId = ideaId || null;
     if (ideaId) {
@@ -1074,28 +1294,104 @@ function saveIdea() {
         idea.title = title; idea.description = desc; idea.note = note; idea.status = ideaStatus;
     } else {
         data.ideas.push({
-            id: genId('idea'), title, description: desc,
-            status: ideaStatus, note,
+            id: genId('idea'), title, description: desc, status: ideaStatus, note,
             by: (data.members || ['mai'])[0],
             created: new Date().toISOString().slice(0, 10),
         });
     }
-    persist(); closeIdeaModal(); renderIdeas(); lucide.createIcons();
+    persist(); closeIdeaModal(); renderIdeas();
+    renderAppNav(); lucide.createIcons();
     showToast(editIdeaId ? '更新しました' : 'アイデアを追加しました');
 }
 
 function deleteIdea() {
     if (!editIdeaId || !confirm('このアイデアを削除しますか？')) return;
     data.ideas = data.ideas.filter(i => i.id !== editIdeaId);
-    persist(); closeIdeaModal(); renderIdeas(); lucide.createIcons();
+    persist(); closeIdeaModal(); renderIdeas();
+    renderAppNav(); lucide.createIcons();
     showToast('削除しました');
 }
 
-// ── Event delegation ──────────────────────────────────────────────────────────
+// ── Sidebar ────────────────────────────────────────────────────────────────────
+function openSidebar() {
+    document.getElementById('sidebar').classList.add('open');
+    document.getElementById('sidebarOverlay').classList.add('open');
+    document.getElementById('menuBtn').setAttribute('aria-expanded', 'true');
+}
+function closeSidebar() {
+    document.getElementById('sidebar').classList.remove('open');
+    document.getElementById('sidebarOverlay').classList.remove('open');
+    document.getElementById('menuBtn').setAttribute('aria-expanded', 'false');
+}
+
+// ── Theme ──────────────────────────────────────────────────────────────────────
+function applyTheme(t) {
+    const dark = t === 'dark' || (t === 'system' && matchMedia('(prefers-color-scheme:dark)').matches);
+    document.documentElement.setAttribute('data-theme', dark ? 'dark' : 'light');
+    document.documentElement.setAttribute('data-theme-pref', t);
+    localStorage.setItem('posimai-roadmap-theme', t);
+    document.querySelectorAll('.theme-btn').forEach(b => {
+        b.classList.toggle('active', b.dataset.themeVal === t);
+    });
+}
+function initTheme() {
+    const t = localStorage.getItem('posimai-roadmap-theme') || 'system';
+    applyTheme(t);
+}
+
+// ── Toast (fallback if base.js doesn't provide) ────────────────────────────────
+function showToast(msg) {
+    if (typeof window.showToast === 'function' && window.showToast !== showToast) {
+        window.showToast(msg); return;
+    }
+    const el = document.getElementById('toast');
+    el.textContent = msg;
+    el.classList.add('show');
+    clearTimeout(el._t);
+    el._t = setTimeout(() => el.classList.remove('show'), 2800);
+}
+
+// ── Settings panel ─────────────────────────────────────────────────────────────
+function openSettings() {
+    document.getElementById('settingsPanel').classList.add('open');
+    document.getElementById('overlay').classList.add('open');
+    document.getElementById('settingsOpenBtn').setAttribute('aria-expanded', 'true');
+}
+function closeSettings() {
+    document.getElementById('settingsPanel').classList.remove('open');
+    document.getElementById('overlay').classList.remove('open');
+    document.getElementById('settingsOpenBtn').setAttribute('aria-expanded', 'false');
+}
+
+// ── Event delegation ───────────────────────────────────────────────────────────
 document.addEventListener('click', e => {
-    // Tabs
-    const tab = e.target.closest('.tab-btn[data-view]');
-    if (tab) { switchView(tab.dataset.view); return; }
+    // Hamburger
+    if (e.target.closest('#menuBtn')) { openSidebar(); return; }
+    if (e.target.closest('#closeSidebarBtn')) { closeSidebar(); return; }
+    if (e.target.id === 'sidebarOverlay') { closeSidebar(); return; }
+
+    // Settings
+    if (e.target.closest('#settingsOpenBtn')) { openSettings(); return; }
+    if (e.target.closest('#settingsCloseBtn')) { closeSettings(); return; }
+    if (e.target.id === 'overlay') { closeSettings(); return; }
+
+    // Theme
+    const tb = e.target.closest('.theme-btn');
+    if (tb) { applyTheme(tb.dataset.themeVal); return; }
+
+    // Sidebar nav
+    const navItem = e.target.closest('.nav-item[data-nav]');
+    if (navItem) {
+        e.preventDefault();
+        const nav = navItem.dataset.nav;
+        if (nav === 'board')  { switchView('board'); }
+        else if (nav === 'ideas') { switchView('ideas'); }
+        else if (nav === 'app') { switchView('app', navItem.dataset.appId); }
+        return;
+    }
+
+    // App search clear on X
+    if (e.target.closest('#appSearch')) return; // let input handle
 
     // Board task card
     const card = e.target.closest('.task-card');
@@ -1103,35 +1399,45 @@ document.addEventListener('click', e => {
         openTaskModal({ taskId: card.dataset.id, appId: card.dataset.app }); return;
     }
 
-    // Apps task title
-    const atitle = e.target.closest('.app-task-title[data-id]');
-    if (atitle && !e.target.closest('a')) {
-        openTaskModal({ taskId: atitle.dataset.id, appId: atitle.dataset.app }); return;
+    // App view task row
+    const row = e.target.closest('.app-task-row[data-id]');
+    if (row && !e.target.closest('a')) {
+        openTaskModal({ taskId: row.dataset.id, appId: row.dataset.app }); return;
     }
 
-    // Add task buttons
+    // Status group header toggle
+    const sgHeader = e.target.closest('.status-group-header');
+    if (sgHeader) { sgHeader.closest('.status-group')?.classList.toggle('collapsed'); return; }
+
+    // Add task buttons (board col + app view row)
     const addBtn = e.target.closest('[data-add-status]');
     if (addBtn) {
         openTaskModal({ defaultStatus: addBtn.dataset.addStatus, defaultApp: addBtn.dataset.addApp || null }); return;
     }
 
-    // App section toggle
-    const header = e.target.closest('.app-section-header');
-    if (header) { header.closest('.app-section')?.classList.toggle('open'); return; }
-
     // Idea card
     const icard = e.target.closest('.idea-card[data-idea-id]');
     if (icard) { openIdeaModal(icard.dataset.ideaId); return; }
 
     // Idea filter
     const ifilt = e.target.closest('[data-ifilter]');
-    if (ifilt) { ideaFilter = ifilt.dataset.ifilter; renderIdeas(); lucide.createIcons(); return; }
+    if (ifilt) {
+        ideaFilter = ifilt.dataset.ifilter;
+        renderIdeas(); lucide.createIcons(); return;
+    }
 
     // Add idea
     if (e.target.closest('#addIdeaBtn')) { openIdeaModal(null); return; }
 
+    // Header add button
+    if (e.target.closest('#addHeaderBtn')) {
+        if (currentView === 'ideas') openIdeaModal(null);
+        else openTaskModal({ defaultStatus: 'next', defaultApp: currentApp || null });
+        return;
+    }
+
     // FAB
-    if (e.target.closest('#fabBtn')) { openTaskModal({ defaultStatus: 'next' }); return; }
+    if (e.target.closest('#fabBtn')) { openTaskModal({ defaultStatus: 'next', defaultApp: currentApp || null }); return; }
 
     // Status pickers
     const spick = e.target.closest('.spick');
@@ -1170,12 +1476,22 @@ document.addEventListener('click', e => {
 });
 
 document.addEventListener('keydown', e => {
-    if (e.key === 'Escape') { closeTaskModal(); closeIdeaModal(); }
-    if (e.key === 'Enter' && (e.target.matches('.task-card') || e.target.matches('.idea-card'))) e.target.click();
+    if (e.key === 'Escape') { closeTaskModal(); closeIdeaModal(); closeSettings(); closeSidebar(); }
+    if (e.key === 'Enter' && (e.target.matches('.task-card') || e.target.matches('.idea-card') || e.target.matches('.app-task-row'))) {
+        e.target.click();
+    }
 });
 
-// ── Boot ──────────────────────────────────────────────────────────────────────
+// App search
+document.getElementById('appSearch').addEventListener('input', e => {
+    appSearch = e.target.value;
+    renderAppNav();
+    lucide.createIcons({ nodes: [document.getElementById('appNavList')] });
+});
+
+// ── Boot ───────────────────────────────────────────────────────────────────────
 loadData().then(() => {
+    initTheme();
     renderAll();
     if ('serviceWorker' in navigator) navigator.serviceWorker.register('/sw.js');
 });