feat(webui): Fluent 2 mica/acrylic materials, acrylic topbar overlay, token consistency

- Restore official light neutral background ramp; add danger hover/pressed and warning-border tokens; drop dead --edge
- Mica ambient brand-tinted backdrop; acrylic sidebar/topbar/flyouts with reduced-transparency fallback
- Content and session rail scroll under the acrylic topbar (--topbar-h driven offsets)
- Global .danger-solid, shared .chip/.dot, card hover lift, radius/type ramp normalization; bump to 1.5.1

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "picobot"
-version = "1.5.0"
+version = "1.5.1"
 edition = "2024"
 
 [dependencies]

webui/index.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="color-scheme" content="light dark" />
-    <meta name="theme-color" content="#f5f5f5" />
+    <meta name="theme-color" content="#fafafa" />
     <script src="/theme-init.js"></script>
     <title>PicoBot Workspace</title>
   </head>

webui/package.json

@@ -1,7 +1,7 @@
 {
   "name": "picobot-webui",
   "private": true,
-  "version": "1.5.0",
+  "version": "1.5.1",
   "type": "module",
   "engines": {
     "node": ">=20"

webui/src/lib/components/ActivitySpine.svelte

@@ -98,7 +98,7 @@
   .spine-shell { position: relative; margin-left: auto; min-width: 0; }
   .spine-shell summary { list-style: none; }
   .spine-shell summary::-webkit-details-marker { display: none; }
-  .spine { display: flex; align-items: center; gap: 10px; min-height: 32px; padding: 0 11px; border: 1px solid var(--line); border-radius: 6px; font-size: 11.5px; color: var(--text-soft); background: var(--panel-2); font-variant-numeric: tabular-nums; cursor: pointer; user-select: none; }
+  .spine { display: flex; align-items: center; gap: 10px; min-height: 32px; padding: 0 11px; border: 1px solid var(--line); border-radius: 6px; font-size: 11px; color: var(--text-soft); background: var(--panel-2); font-variant-numeric: tabular-nums; cursor: pointer; user-select: none; }
   .spine:hover { border-color: var(--line-strong); background: var(--color-neutral-background-4); }
   .spine:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
   .spine-turn { display: inline-flex; align-items: center; gap: 7px; font-weight: 700; white-space: nowrap; }
@@ -119,17 +119,17 @@
   .spine-down { color: var(--danger); }
   .context-pending { color: var(--muted); }
 
-  .stats-panel { position: absolute; z-index: 30; top: calc(100% + 8px); right: 0; width: min(390px, calc(100vw - 28px)); padding: 17px; border: 1px solid var(--line-strong); border-radius: 10px; color: var(--text); background: var(--overlay); box-shadow: var(--shadow-16); font-family: var(--font-ui); }
+  .stats-panel { position: absolute; z-index: 30; top: calc(100% + 8px); right: 0; width: min(390px, calc(100vw - 28px)); padding: 17px; border: 1px solid var(--line-strong); border-radius: 10px; color: var(--text); background: var(--surface-acrylic); backdrop-filter: var(--acrylic-blur); -webkit-backdrop-filter: var(--acrylic-blur); box-shadow: var(--shadow-16); font-family: var(--font-ui); }
   .stats-panel header, .usage-heading, .stats-panel footer { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
   .stats-panel header div { display: flex; align-items: baseline; gap: 10px; }
   .stats-panel header span, .usage-heading span { font-size: 12px; font-weight: 700; }
   .stats-panel header strong { font-family: var(--font-mono); font-size: 21px; letter-spacing: -0.04em; }
-  .stats-panel small, .stats-panel footer { color: var(--muted); font-size: 10.5px; }
+  .stats-panel small, .stats-panel footer { color: var(--muted); font-size: 10px; }
   .detail-rail { height: 8px; margin: 12px 0 15px; border-radius: 99px; }
-  .context-grid, .usage-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 7px; background: var(--line); }
+  .context-grid, .usage-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: var(--line); }
   .context-grid div, .usage-grid div { min-width: 0; padding: 9px 10px; background: var(--panel); }
-  dt { color: var(--muted); font-size: 10.5px; }
+  dt { color: var(--muted); font-size: 10px; }
-  dd { margin: 3px 0 0; overflow: hidden; font-family: var(--font-mono); font-size: 11.5px; font-variant-numeric: tabular-nums; text-overflow: ellipsis; white-space: nowrap; }
+  dd { margin: 3px 0 0; overflow: hidden; font-family: var(--font-mono); font-size: 11px; font-variant-numeric: tabular-nums; text-overflow: ellipsis; white-space: nowrap; }
   .usage-heading { margin: 16px 0 8px; }
   .stats-panel footer { margin-top: 12px; padding-top: 11px; border-top: 1px solid var(--line); }
   .stats-panel footer span { text-align: right; }
@@ -149,4 +149,7 @@
   @media (prefers-reduced-motion: reduce) {
     .context-rail i, .detail-rail i { transition: none; }
   }
+  @media (prefers-reduced-transparency: reduce) {
+    .stats-panel { background: var(--overlay); backdrop-filter: none; -webkit-backdrop-filter: none; }
+  }
 </style>

webui/src/lib/components/AppearanceSettings.svelte

@@ -99,7 +99,9 @@
   .mode-grid > button { position: relative; padding: 10px; border: 1px solid var(--line-strong); border-radius: 8px; color: var(--text); background: var(--panel); text-align: left; cursor: pointer; }
   .mode-grid > button:hover { background: var(--panel-2); }
   .mode-grid > button.selected { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
-  .mode-preview { position: relative; height: 80px; display: block; overflow: hidden; border: 1px solid #d1d1d1; border-radius: 5px; background: #f5f5f5; }
+  /* Mode thumbnails are intentionally theme-independent illustrations: they depict both
+     light and dark surfaces at once, so they use fixed Fluent palette values instead of tokens. */
+  .mode-preview { position: relative; height: 80px; display: block; overflow: hidden; border: 1px solid #d1d1d1; border-radius: 6px; background: #f5f5f5; }
   .mode-preview::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 24%; border-right: 1px solid #d1d1d1; background: #fafafa; }
   .mode-preview i, .mode-preview b, .mode-preview em { position: absolute; display: block; border-radius: 2px; }
   .mode-preview i { top: 12px; left: 31%; width: 46%; height: 7px; background: var(--accent); }
@@ -116,25 +118,25 @@
   .accent-grid button { min-width: 0; display: flex; align-items: center; gap: 10px; padding: 10px; border: 1px solid var(--line); border-radius: 6px; color: var(--text); background: var(--panel); text-align: left; cursor: pointer; }
   .accent-grid button:hover { border-color: var(--line-strong); background: var(--panel-2); }
   .accent-grid button.selected { border-color: var(--accent); background: var(--accent-soft); }
-  .swatch { width: 30px; height: 30px; flex: 0 0 30px; display: grid; place-items: center; border: 1px solid rgb(0 0 0 / 12%); border-radius: 6px; color: #fff; background: var(--swatch); }
+  .swatch { width: 30px; height: 30px; flex: 0 0 30px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 6px; color: #fff; background: var(--swatch); }
   .accent-grid strong, .accent-grid small { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
   .accent-grid strong { font-size: 12px; }
   .accent-grid small { margin-top: 2px; color: var(--muted); font-size: 10px; }
   .storage-note { margin: -2px 2px 0; color: var(--muted); font-size: 11px; line-height: 17px; }
-  .preview-card { position: sticky; top: 0; overflow: hidden; }
+  .preview-card { position: sticky; top: calc(var(--topbar-h) + 20px); overflow: hidden; }
   .preview-heading { display: flex; align-items: center; justify-content: space-between; padding: 13px 14px; border-bottom: 1px solid var(--line); font-size: 12px; font-weight: 600; }
   .preview-status { display: inline-flex; align-items: center; gap: 5px; color: var(--signal); font-size: 10px; }
   .preview-status i { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
-  .preview-window { margin: 14px; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 7px; background: var(--bg); box-shadow: var(--shadow-8); }
+  .preview-window { margin: 14px; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--bg); box-shadow: var(--shadow-8); }
   .preview-titlebar { height: 38px; display: flex; align-items: center; gap: 7px; padding: 0 9px; border-bottom: 1px solid var(--line); background: var(--panel); font-size: 11px; }
-  .preview-logo { width: 23px; height: 23px; display: grid; place-items: center; border-radius: 5px; color: var(--accent-contrast); background: var(--accent); }
+  .preview-logo { width: 23px; height: 23px; display: grid; place-items: center; border-radius: 6px; color: var(--accent-contrast); background: var(--accent); }
   .window-dots { margin-left: auto; color: var(--muted); letter-spacing: 2px; }
   .preview-body { height: 180px; display: grid; grid-template-columns: 48px 1fr; }
   .preview-nav { display: grid; align-content: start; gap: 8px; padding: 12px 8px; border-right: 1px solid var(--line); background: var(--panel); }
-  .preview-nav span { height: 7px; border-radius: 3px; background: var(--line-strong); }
+  .preview-nav span { height: 7px; border-radius: 4px; background: var(--line-strong); }
-  .preview-nav span.active { height: 20px; border-left: 2px solid var(--accent); border-radius: 3px; background: var(--accent-soft); }
+  .preview-nav span.active { height: 20px; border-left: 2px solid var(--accent); border-radius: 4px; background: var(--accent-soft); }
   .preview-content { padding: 18px 14px; }
-  .preview-line { height: 7px; border-radius: 3px; background: var(--line-strong); }
+  .preview-line { height: 7px; border-radius: 4px; background: var(--line-strong); }
   .preview-line.wide { width: 70%; }
   .preview-line.short { width: 42%; margin-top: 7px; opacity: .65; }
   .preview-message { display: flex; align-items: center; gap: 7px; margin-top: 24px; color: var(--accent); }

webui/src/lib/components/MetricTile.svelte

@@ -16,8 +16,8 @@
 </div>
 
 <style>
-  .tile { display: flex; flex-direction: column; gap: 5px; padding: 15px 17px; transition: border-color .1s ease; }
+  .tile { display: flex; flex-direction: column; gap: 5px; padding: 15px 17px; transition: border-color .15s ease, box-shadow .15s ease; }
-  .tile:hover { border-color: var(--line-strong); }
+  .tile:hover { border-color: var(--line-strong); box-shadow: var(--shadow-8); }
   .value { font-size: 28px; font-weight: 600; line-height: 1.2; letter-spacing: -0.02em; color: var(--text); font-variant-numeric: tabular-nums; }
   .sub { font-size: 12px; color: var(--muted); }
   .spark { height: 28px; margin-top: 4px; }

webui/src/lib/theme.js

@@ -38,7 +38,7 @@ export function applyTheme(theme) {
   document.documentElement.style.colorScheme = next;
   document
     .querySelector('meta[name="theme-color"]')
-    ?.setAttribute("content", next === "dark" ? "#1f1f1f" : "#f5f5f5");
+    ?.setAttribute("content", next === "dark" ? "#1f1f1f" : "#fafafa");
   localStorage.setItem(STORAGE_KEY, next);
   notifyAppearance();
 }

webui/src/pages/LogsPage.svelte

@@ -174,29 +174,6 @@
 </section>
 
 <style>
-  .chips {
-    display: flex;
-    gap: 4px;
-  }
-
-  .chip {
-    border: 1px solid var(--line);
-    background: var(--panel);
-    color: var(--muted);
-    border-radius: 4px;
-    padding: 5px 12px;
-    font-size: 12px;
-    font-weight: 500;
-    cursor: pointer;
-    transition: all 0.15s;
-  }
-
-  .chip.active {
-    background: var(--accent-soft);
-    border-color: var(--accent-border);
-    color: var(--accent);
-  }
-
   .status-bar {
     display: flex;
     align-items: center;
@@ -215,14 +192,10 @@
   }
 
   .dot {
-    width: 6px;
+    animation: dot-pulse 2s infinite;
-    height: 6px;
-    border-radius: 50%;
-    background: currentColor;
-    animation: pulse 2s infinite;
   }
 
-  @keyframes pulse {
+  @keyframes dot-pulse {
     0%, 100% { opacity: 1; }
     50% { opacity: 0.4; }
   }

webui/src/pages/MemoryPage.svelte

@@ -162,8 +162,6 @@
   .card-actions { display: flex; gap: 8px; flex-wrap: wrap; }
   .card > .card-actions { margin-top: 14px; }
   .danger-outline { border-color: var(--danger-border); color: var(--danger); }
-  .danger-solid { border-radius: 4px; padding: 5px 12px; font-weight: 600; cursor: pointer; border: 1px solid var(--danger); background: var(--danger); color: #fff; }
-  .danger-solid:hover { filter: brightness(1.08); }
   .edit-field { display: grid; gap: 6px; margin-top: 12px; }
   .edit-field > span { color: var(--muted); font-size: 12px; }
   .edit-field textarea { width: 100%; min-height: 90px; resize: vertical; border: 1px solid var(--line-strong); border-radius: 4px; background: var(--panel); color: var(--text); padding: 10px; font: 14px/1.6 var(--font-ui); }

webui/src/pages/OverviewPage.svelte

@@ -60,7 +60,7 @@
       <span>离线 — {error}</span>
     </div>
   {:else if status}
-    <div class="status-bar panel">
+    <div class="status-strip panel">
       <div class="status-left">
         <span class="pulse-dot" class:active={running}></span>
         <strong>{running ? "运行中" : "空闲"}</strong>
@@ -168,13 +168,13 @@
 
 <style>
   .offline { display: flex; align-items: center; gap: 10px; padding: 18px 22px; color: var(--danger); font-size: 14px; }
-  .status-bar { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; margin-bottom: 14px; flex-wrap: wrap; gap: 10px; }
+  .status-strip { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; margin-bottom: 14px; flex-wrap: wrap; gap: 10px; }
   .status-left { display: flex; align-items: center; gap: 10px; }
   .status-meta { display: flex; gap: 16px; font-size: 12px; color: var(--text-soft); flex-wrap: wrap; font-variant-numeric: tabular-nums; }
   .warn-bar { color: var(--accent); font-size: 12px; margin-bottom: 10px; }
   .tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 14px; }
   .section { padding: 16px 18px; margin-bottom: 14px; display: flex; flex-direction: column; gap: 12px; overflow-x: auto; }
-  .provider-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 12.5px; font-variant-numeric: tabular-nums; }
+  .provider-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 12px; font-variant-numeric: tabular-nums; }
   .provider-table th { text-align: left; color: var(--muted); font-weight: 500; padding: 4px 8px; border-bottom: 1px solid var(--line); font-size: 11px; }
   .provider-table td { padding: 8px 8px; border-bottom: 1px solid var(--line); color: var(--text-soft); }
   .provider-table tr:last-child td { border-bottom: none; }

webui/src/pages/TasksPage.svelte

@@ -146,6 +146,5 @@
 <style>
   .cron { font-size: 12px; color: var(--text-soft); background: var(--code-bg); padding: 1px 6px; border-radius: 4px; border: 1px solid var(--line); font-variant-numeric: tabular-nums; }
   .status-dots { display: flex; gap: 4px; margin-top: 6px; align-items: center; }
-  .dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
   .elapsed { color: var(--info); font-family: var(--font-mono); font-size: 11px; font-variant-numeric: tabular-nums; }
 </style>

webui/src/pages/ToolsPage.svelte

@@ -170,9 +170,6 @@
 
 <style>
   .filters-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
-  .chips { display: flex; gap: 7px; flex-wrap: wrap; }
-  .chip { border: 1px solid var(--line-strong); background: var(--panel); color: var(--muted); border-radius: 4px; padding: 5px 10px; font-size: 12px; font-weight: 600; cursor: pointer; }
-  .chip.active { background: var(--accent-soft); border-color: var(--accent-border); color: var(--accent); }
   .legend { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
   .tool-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
   .cap-row { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }

webui/src/styles.css

@@ -23,9 +23,9 @@
 
   /* Fluent 2 semantic tokens */
   --color-neutral-background-1: #ffffff;
-  --color-neutral-background-2: #f5f5f5;
+  --color-neutral-background-2: #fafafa;
-  --color-neutral-background-3: #f0f0f0;
+  --color-neutral-background-3: #f5f5f5;
-  --color-neutral-background-4: #e8e8e8;
+  --color-neutral-background-4: #ebebeb;
   --color-neutral-foreground-1: #242424;
   --color-neutral-foreground-2: #424242;
   --color-neutral-foreground-3: #616161;
@@ -48,7 +48,7 @@
   --panel: var(--color-neutral-background-1);
   --panel-2: var(--color-neutral-background-3);
   --sidebar: #fafafa;
-  --header: rgb(255 255 255 / 94%);
+  --header: rgb(255 255 255 / 82%);
   --line: var(--color-neutral-stroke-2);
   --line-strong: var(--color-neutral-stroke-1);
   --muted: var(--color-neutral-foreground-3);
@@ -68,10 +68,13 @@
   --info-soft: #ebf3fc;
   --info-border: #b4d6fa;
   --danger: var(--color-status-danger);
+  --danger-hover: #9c0c19;
+  --danger-pressed: #7c0a14;
   --danger-soft: #fdf3f4;
   --danger-border: #eeacb2;
   --warning: var(--color-status-warning);
   --warning-soft: #fff9f5;
+  --warning-border: #f2bb8d;
   --success-soft: #f1faf1;
   --overlay: #ffffff;
   --code-bg: #f5f5f5;
@@ -82,7 +85,6 @@
   --shadow: var(--shadow-16);
   --shadow-sm: var(--shadow-2);
   --shadow-lift: var(--shadow-8);
-  --edge: none;
   --radius: 8px;
 }
 
@@ -110,7 +112,7 @@
   --panel: var(--color-neutral-background-1);
   --panel-2: var(--color-neutral-background-3);
   --sidebar: #242424;
-  --header: rgb(41 41 41 / 94%);
+  --header: rgb(41 41 41 / 82%);
   --line: var(--color-neutral-stroke-2);
   --line-strong: var(--color-neutral-stroke-1);
   --muted: var(--color-neutral-foreground-3);
@@ -130,10 +132,13 @@
   --info-soft: #0f2d46;
   --info-border: #0f6cbd;
   --danger: var(--color-status-danger);
+  --danger-hover: #e17a83;
+  --danger-pressed: #b74954;
   --danger-soft: #3b1219;
   --danger-border: #8f1d2c;
   --warning: var(--color-status-warning);
   --warning-soft: #3a2d00;
+  --warning-border: #986f00;
   --success-soft: #183b18;
   --overlay: #333333;
   --code-bg: #1f1f1f;
@@ -155,6 +160,17 @@
 :root[data-theme="dark"][data-accent="orange"] { --color-brand-background: #f4a261; --color-brand-background-hover: #ffb57a; --color-brand-background-pressed: #db8747; --color-brand-foreground: #ffb57a; --color-brand-subtle: #402313; --accent-border: #c45d1d; --accent-contrast: #1f1f1f; }
 :root[data-theme="dark"][data-accent="magenta"] { --color-brand-background: #e36fbe; --color-brand-background-hover: #ef88cc; --color-brand-background-pressed: #c951a3; --color-brand-foreground: #ef88cc; --color-brand-subtle: #3d1830; --accent-border: #a4267a; --accent-contrast: #1f1f1f; }
 
+/* Fluent materials. Mica: ambient brand-tinted backdrop. Acrylic: translucent blurred surfaces. */
+:root {
+  --topbar-h: 68px;
+  --mica:
+    radial-gradient(1200px 560px at 76% -140px, color-mix(in srgb, var(--accent) 7%, transparent), transparent 64%),
+    radial-gradient(900px 480px at -8% 108%, color-mix(in srgb, var(--accent) 4%, transparent), transparent 60%),
+    var(--bg);
+  --surface-acrylic: color-mix(in srgb, var(--overlay) 80%, transparent);
+  --acrylic-blur: blur(20px) saturate(1.5);
+}
+
 * { box-sizing: border-box; scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent; }
 *::-webkit-scrollbar { width: 10px; height: 10px; }
 *::-webkit-scrollbar-track { background: transparent; }
@@ -162,7 +178,7 @@
 *::-webkit-scrollbar-thumb:hover { background-color: var(--muted); }
 ::selection { color: var(--text); background: var(--accent-soft); }
 html, body, #app { width: 100%; min-width: 320px; height: 100%; }
-body { margin: 0; color: var(--text); background: var(--bg); font-size: 14px; }
+body { margin: 0; color: var(--text); background: var(--mica); font-size: 14px; }
 h1, h2, h3, h4 { font-family: "Segoe UI Variable Display", var(--font-ui); font-weight: 600; }
 strong, b { font-weight: 600; }
 button, input, textarea, select { font: inherit; }
@@ -173,7 +189,7 @@ button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-
 button:disabled { cursor: not-allowed; opacity: .45; }
 
 /* Pairing */
-.pairing-screen { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: linear-gradient(135deg, var(--bg), var(--panel-2)); }
+.pairing-screen { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
 .pairing-card { width: min(100%, 440px); padding: 32px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); box-shadow: var(--shadow-16); }
 .pairing-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 32px; }
 .pairing-brand strong { font-size: 16px; }
@@ -193,7 +209,7 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 
 /* Application shell */
 .shell { height: 100vh; display: grid; grid-template-columns: 248px minmax(0, 1fr); overflow: hidden; }
-.sidebar { z-index: 30; display: flex; flex-direction: column; min-width: 0; padding: 8px 12px 12px; border-right: 1px solid var(--line); background: var(--sidebar); }
+.sidebar { z-index: 30; display: flex; flex-direction: column; min-width: 0; padding: 8px 12px 12px; border-right: 1px solid var(--line); background: color-mix(in srgb, var(--sidebar) 72%, transparent); backdrop-filter: var(--acrylic-blur); -webkit-backdrop-filter: var(--acrylic-blur); }
 .brand { display: flex; align-items: center; gap: 11px; min-height: 60px; padding: 6px 8px; }
 .brand-mark, .empty-logo { display: grid; place-items: center; color: var(--accent-contrast); background: linear-gradient(145deg, var(--accent), var(--accent-pressed)); }
 .brand-mark { width: 36px; height: 36px; border-radius: 8px; box-shadow: var(--shadow-2); }
@@ -216,8 +232,8 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .gateway-status b, .gateway-status small { display: block; }
 .gateway-status b { font-size: 12px; line-height: 16px; }
 .gateway-status small { margin-top: 1px; color: var(--muted); font-size: 10px; line-height: 14px; }
-.app-main { min-width: 0; min-height: 0; height: 100vh; display: flex; flex-direction: column; background: var(--bg); }
+.app-main { position: relative; min-width: 0; min-height: 0; height: 100vh; display: flex; flex-direction: column; }
-.topbar { z-index: 10; min-height: 68px; flex: 0 0 68px; display: flex; align-items: center; gap: 12px; padding: 0 24px; border-bottom: 1px solid var(--line); background: var(--header); backdrop-filter: blur(16px); }
+.topbar { position: absolute; inset: 0 0 auto 0; z-index: 10; min-height: var(--topbar-h); display: flex; align-items: center; gap: 12px; padding: 0 24px; border-bottom: 1px solid var(--line); background: var(--header); backdrop-filter: var(--acrylic-blur); -webkit-backdrop-filter: var(--acrylic-blur); }
 .page-heading { min-width: 180px; }
 .topbar h1 { margin: 0; font-size: 20px; line-height: 26px; }
 .topbar p { margin: 1px 0 0; color: var(--muted); font-size: 12px; line-height: 16px; }
@@ -226,7 +242,7 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .theme-toggle:hover { color: var(--text); background: var(--panel-2); }
 .nav-scrim { display: none; }
 
-/* Fluent controls */
+/* Fluent controls. 13px/20px control text is a deliberate dense ramp choice below Fluent Body1 14/20. */
 .primary, .secondary, .danger-solid { min-height: 32px; padding: 5px 12px; border-radius: 4px; font-size: 13px; line-height: 20px; font-weight: 600; cursor: pointer; transition: background-color .1s ease, border-color .1s ease; }
 .primary, .secondary, .danger-solid { display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
 .primary { border: 1px solid var(--accent); color: var(--accent-contrast); background: var(--accent); }
@@ -235,6 +251,9 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .secondary { border: 1px solid var(--line-strong); color: var(--text); background: var(--panel); }
 .secondary:hover { background: var(--panel-2); }
 .secondary:active { background: var(--color-neutral-background-4); }
+.danger-solid { border: 1px solid var(--danger); color: var(--accent-contrast); background: var(--danger); }
+.danger-solid:hover:not(:disabled) { border-color: var(--danger-hover); background: var(--danger-hover); }
+.danger-solid:active:not(:disabled) { border-color: var(--danger-pressed); background: var(--danger-pressed); }
 .full { width: 100%; min-height: 36px; }
 .icon-button { width: 32px; height: 32px; display: inline-grid; place-items: center; padding: 0; border: 0; border-radius: 4px; color: var(--text-soft); background: transparent; cursor: pointer; }
 .icon-button:hover { color: var(--text); background: var(--panel-2); }
@@ -244,20 +263,25 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .search input { width: 100%; padding: 0 7px; border: 0; outline: 0; color: var(--text); background: transparent; font-size: 13px; }
 .filters select { height: 34px; padding: 0 28px 0 10px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--text); background: var(--panel); }
 .grow { flex: 1; max-width: 520px; }
+.chips { display: flex; gap: 6px; flex-wrap: wrap; }
+.chip { padding: 5px 11px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--muted); background: var(--panel); font-size: 12px; font-weight: 600; cursor: pointer; transition: background-color .1s ease, border-color .1s ease, color .1s ease; }
+.chip:hover { border-color: var(--muted); color: var(--text); }
+.chip.active { color: var(--accent); border-color: var(--accent-border); background: var(--accent-soft); }
+.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
 .tabs { display: flex; gap: 16px; min-height: 36px; border-bottom: 1px solid var(--line); }
 .tabs button { position: relative; padding: 0 2px 9px; border: 0; color: var(--muted); background: none; cursor: pointer; font-size: 13px; font-weight: 600; }
 .tabs button::after { content: ""; position: absolute; right: 0; bottom: -1px; left: 0; height: 2px; border-radius: 2px; background: var(--accent); transform: scaleX(0); }
 .tabs button:hover { color: var(--text); }
 .tabs button[data-state="active"] { color: var(--text); }
 .tabs button[data-state="active"]::after { transform: scaleX(1); }
-.tooltip { z-index: 50; padding: 6px 9px; border: 1px solid var(--line); border-radius: 4px; color: var(--text); background: var(--overlay); box-shadow: var(--shadow-8); font-size: 12px; }
+.tooltip { z-index: 50; padding: 6px 9px; border: 1px solid var(--line); border-radius: 4px; color: var(--text); background: var(--surface-acrylic); backdrop-filter: var(--acrylic-blur); -webkit-backdrop-filter: var(--acrylic-blur); box-shadow: var(--shadow-8); font-size: 12px; }
 .tooltip-arrow { fill: var(--overlay); }
 
 /* Chat */
 .page { min-height: 0; flex: 1; animation: page-in .16s ease both; }
-.chat-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); }
+.chat-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); padding-top: var(--topbar-h); }
 .chat-layout.todo-open { grid-template-columns: 280px minmax(0, 1fr) 320px; }
-.sessions-panel { overflow: auto; padding: 16px 12px; border-right: 1px solid var(--line); background: var(--panel); }
+.sessions-panel { overflow: auto; margin-top: calc(-1 * var(--topbar-h)); padding: 16px 12px; padding-top: calc(var(--topbar-h) + 16px); scroll-padding-top: calc(var(--topbar-h) + 16px); border-right: 1px solid var(--line); background: var(--panel); }
 .sessions-panel > .search { margin-top: 12px; }
 .session-list-head { display: flex; align-items: center; justify-content: space-between; margin: 18px 8px 7px; }
 .session-count { color: var(--muted); font: 11px var(--font-mono); font-variant-numeric: tabular-nums; }
@@ -335,7 +359,7 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .markdown-body h3 { font-size: 1.08em; }
 .markdown-body a { color: var(--accent); text-underline-offset: 2px; }
 .markdown-body blockquote { padding-left: 12px; border-left: 3px solid var(--accent); color: var(--muted); }
-.markdown-body code { padding: .12em .32em; border-radius: 3px; color: var(--text); background: var(--code-bg); font: .88em/1.5 var(--font-mono); }
+.markdown-body code { padding: .12em .32em; border-radius: 4px; color: var(--text); background: var(--code-bg); font: .88em/1.5 var(--font-mono); }
 .markdown-body pre { max-width: 100%; padding: 12px; overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; background: var(--code-bg); }
 .markdown-body pre code { padding: 0; border: 0; background: transparent; }
 .markdown-body table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
@@ -379,8 +403,8 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .pending-upload strong { font-size: 11px; }
 .pending-upload small { color: var(--muted); font-size: 10px; }
 .pending-upload button { border: 0; color: var(--muted); background: none; cursor: pointer; }
-.command-menu { position: absolute; z-index: 5; right: 0; bottom: calc(100% + 8px); left: 0; max-height: min(360px, 48vh); overflow-y: auto; padding: 6px; border: 1px solid var(--line); border-radius: 8px; background: var(--overlay); box-shadow: var(--shadow-16); }
+.command-menu { position: absolute; z-index: 40; right: 0; bottom: calc(100% + 8px); left: 0; max-height: min(360px, 48vh); overflow-y: auto; padding: 6px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-acrylic); backdrop-filter: var(--acrylic-blur); -webkit-backdrop-filter: var(--acrylic-blur); box-shadow: var(--shadow-16); }
-.command-menu-heading { position: sticky; z-index: 1; top: -6px; display: flex; justify-content: space-between; gap: 16px; padding: 8px 9px; color: var(--muted); background: var(--overlay); font-size: 11px; }
+.command-menu-heading { position: sticky; z-index: 1; top: -6px; display: flex; justify-content: space-between; gap: 16px; padding: 8px 9px; color: var(--muted); background: var(--surface-acrylic); font-size: 11px; }
 .command-menu-heading kbd { color: var(--muted); font: inherit; }
 .command-menu button { width: 100%; display: grid; grid-template-columns: minmax(100px, auto) 1fr; gap: 14px; padding: 8px 9px; border: 0; border-radius: 4px; color: var(--text); background: transparent; text-align: left; cursor: pointer; }
 .command-menu button:hover, .command-menu button.selected { background: var(--accent-soft); }
@@ -411,13 +435,13 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .todo-item p { margin: 5px 0 0; color: var(--text-soft); font-size: 11px; line-height: 16px; white-space: pre-wrap; overflow-wrap: anywhere; }
 
 /* Management pages */
-.content-page { overflow: auto; padding: 24px 28px 40px; }
+.content-page { overflow: auto; padding: calc(var(--topbar-h) + 24px) 28px 40px; scroll-padding-top: calc(var(--topbar-h) + 16px); }
 .toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
 .filters { align-items: center; }
 .cards { display: grid; gap: 10px; }
 .card, .panel, .metric { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); box-shadow: var(--shadow-2); }
-.card { padding: 15px 17px; transition: border-color .1s ease; }
+.card { padding: 15px 17px; transition: border-color .15s ease, box-shadow .15s ease; }
-.card:hover { border-color: var(--line-strong); }
+.card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-8); }
 .card-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
 .card h3 { margin: 0 0 6px; font-size: 14px; }
 .card p { margin: 5px 0; color: var(--text-soft); font-size: 13px; line-height: 20px; white-space: pre-wrap; }
@@ -449,7 +473,7 @@ button:disabled { cursor: not-allowed; opacity: .45; }
 .editor-head small { margin-top: 3px; color: var(--muted); font-size: 11px; }
 .editor-card textarea { width: 100%; height: calc(100vh - 275px); min-height: 420px; display: block; resize: vertical; padding: 18px; border: 0; outline: 0; color: var(--text); background: var(--code-bg); font: 13px/1.65 var(--font-mono); tab-size: 2; }
 .notice { padding: 10px 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
-.cap { display: inline-flex; align-items: center; gap: 5px; padding: 3px 7px; border-radius: 4px; font-size: 10.5px; font-weight: 600; }
+.cap { display: inline-flex; align-items: center; gap: 5px; padding: 3px 7px; border-radius: 4px; font-size: 10px; font-weight: 600; }
 .cap.signal { border: 1px solid var(--signal-border); color: var(--signal); background: var(--signal-soft); }
 .cap.accent { border: 1px solid var(--accent-border); color: var(--accent); background: var(--accent-soft); }
 .cap.danger { border: 1px solid var(--danger-border); color: var(--danger); background: var(--danger-soft); }
@@ -483,17 +507,18 @@ code { color: var(--accent); }
 }
 
 @media (max-width: 800px) {
+  :root { --topbar-h: 62px; }
   .shell { grid-template-columns: 1fr; }
   .sidebar { position: fixed; inset: 0 auto 0 0; width: 248px; transform: translateX(-100%); transition: transform .16s ease; box-shadow: var(--shadow-16); }
   .sidebar.open { transform: none; }
   .nav-scrim { position: fixed; z-index: 25; inset: 0; display: block; border: 0; background: rgb(0 0 0 / 42%); }
-  .topbar { min-height: 62px; flex-basis: 62px; padding: 0 14px; }
+  .topbar { padding: 0 14px; }
   .topbar .menu { display: inline-grid; }
   .page-heading p { display: none; }
   .chat-layout, .chat-layout.todo-open { grid-template-columns: 1fr; }
   .sessions-panel { display: none; }
-  .todo-open .todo-panel { position: fixed; z-index: 20; top: 62px; right: 0; bottom: 0; width: min(340px, 92vw); box-shadow: var(--shadow-16); }
+  .todo-open .todo-panel { position: fixed; z-index: 20; top: var(--topbar-h); right: 0; bottom: 0; width: min(340px, 92vw); background: var(--surface-acrylic); backdrop-filter: var(--acrylic-blur); -webkit-backdrop-filter: var(--acrylic-blur); box-shadow: var(--shadow-16); }
-  .content-page { padding: 18px 16px 32px; }
+  .content-page { padding: calc(var(--topbar-h) + 18px) 16px 32px; }
   .settings-grid { grid-template-columns: 1fr; }
   .settings-nav { flex-direction: row; overflow-x: auto; }
   .metrics { grid-template-columns: 1fr; }
@@ -513,3 +538,10 @@ code { color: var(--accent); }
   .toolbar .tabs { width: 100%; overflow-x: auto; }
   .card-row { gap: 10px; }
 }
+
+@media (prefers-reduced-transparency: reduce) {
+  .sidebar { background: var(--sidebar); backdrop-filter: none; -webkit-backdrop-filter: none; }
+  .topbar { background: var(--panel); backdrop-filter: none; -webkit-backdrop-filter: none; }
+  .command-menu, .command-menu-heading, .tooltip { background: var(--overlay); backdrop-filter: none; -webkit-backdrop-filter: none; }
+  .todo-open .todo-panel { background: var(--panel); backdrop-filter: none; -webkit-backdrop-filter: none; }
+}