v6.4 — beat detection suspends with no music (no ghost beats) + royal purple dark theme with light-yellow highlights

src/app/globals.css

@@ -44,6 +44,11 @@
 }
 
 :root {
+  /* v6.4 accent plumbing — same values as .dark (the default theme); the
+     .light block overrides both for the white theme. */
+  --accent-rgb: 253 224 71;
+  --scrollbar-thumb: #56406f;
+
   --radius: 0.625rem;
   --background: oklch(1 0 0);
   --foreground: oklch(0.145 0 0);
@@ -78,58 +83,100 @@
   --sidebar-ring: oklch(0.708 0 0);
 }
 
+/*
+ * OVE dark theme (v6.4) — ROYAL PURPLE with light-yellow highlights.
+ *
+ * The app chrome is styled with the Tailwind zinc/emerald utilities directly,
+ * so — like the .light remap below — the dark palette is produced by remapping
+ * those ramps under `.dark` (unlayered class rules beat Tailwind's @layer
+ * theme, and color-mix keeps the var references so opacity variants follow):
+ *   • zinc is re-hued into a royal-purple ramp — 950 is the deep purple page,
+ *     900 the panel purple, 800/700 borders, 500→50 lavender text;
+ *   • emerald (the old green accent) becomes the LIGHT YELLOW highlight
+ *     family — emerald-400 is #fde047 for CTAs/BPM/active states, hover
+ *     lightens to #fef08a, and emerald-950 (text on the yellow buttons)
+ *     becomes a deep royal purple;
+ *   • the shadcn semantic tokens follow (background/card/border/primary…),
+ *     so dialogs, toasts, sliders and switches pick up the same theme;
+ *   • --accent-rgb carries the highlight color as an rgb triple for the
+ *     .glow-* shadow utilities at the bottom of this file.
+ * The visualization canvas keeps its own black stage by design.
+ */
 .dark {
   color-scheme: dark;
-  --background: oklch(0.145 0 0);
-  --foreground: oklch(0.985 0 0);
-  --card: oklch(0.205 0 0);
-  --card-foreground: oklch(0.985 0 0);
-  --popover: oklch(0.205 0 0);
-  --popover-foreground: oklch(0.985 0 0);
-  --primary: oklch(0.922 0 0);
-  --primary-foreground: oklch(0.205 0 0);
-  --secondary: oklch(0.269 0 0);
-  --secondary-foreground: oklch(0.985 0 0);
-  --muted: oklch(0.269 0 0);
-  --muted-foreground: oklch(0.708 0 0);
-  --accent: oklch(0.269 0 0);
-  --accent-foreground: oklch(0.985 0 0);
+
+  /* semantic tokens — royal purple chrome, light-yellow accent */
+  --background: #1b0f2e;
+  --foreground: #f5f1fb;
+  --card: #2a1a42;
+  --card-foreground: #f5f1fb;
+  --popover: #2a1a42;
+  --popover-foreground: #f5f1fb;
+  --primary: #fde047;
+  --primary-foreground: #241238;
+  --secondary: #35244e;
+  --secondary-foreground: #ece4f8;
+  --muted: #2a1a42;
+  --muted-foreground: #ab97d1;
+  --accent: #35244e;
+  --accent-foreground: #ece4f8;
   --destructive: oklch(0.704 0.191 22.216);
-  --border: oklch(1 0 0 / 10%);
-  --input: oklch(1 0 0 / 15%);
-  --ring: oklch(0.556 0 0);
-  --chart-1: oklch(0.488 0.243 264.376);
-  --chart-2: oklch(0.696 0.17 162.48);
-  --chart-3: oklch(0.769 0.188 70.08);
-  --chart-4: oklch(0.627 0.265 303.9);
-  --chart-5: oklch(0.645 0.246 16.439);
-  --sidebar: oklch(0.205 0 0);
-  --sidebar-foreground: oklch(0.985 0 0);
-  --sidebar-primary: oklch(0.488 0.243 264.376);
-  --sidebar-primary-foreground: oklch(0.985 0 0);
-  --sidebar-accent: oklch(0.269 0 0);
-  --sidebar-accent-foreground: oklch(0.985 0 0);
-  --sidebar-border: oklch(1 0 0 / 10%);
-  --sidebar-ring: oklch(0.556 0 0);
+  --border: #453063;
+  --input: #453063;
+  --ring: #fde047;
+  --chart-1: #fde047;
+  --chart-2: #937cbb;
+  --chart-3: #facc15;
+  --chart-4: #74599f;
+  --chart-5: #c9b8e6;
+  --sidebar: #2a1a42;
+  --sidebar-foreground: #f5f1fb;
+  --sidebar-primary: #fde047;
+  --sidebar-primary-foreground: #241238;
+  --sidebar-accent: #35244e;
+  --sidebar-accent-foreground: #ece4f8;
+  --sidebar-border: #453063;
+  --sidebar-ring: #fde047;
+
+  /* zinc ramp → royal purple */
+  --color-zinc-50: #f5f1fb;
+  --color-zinc-100: #ece4f8;
+  --color-zinc-200: #ded2f0;
+  --color-zinc-300: #c9b8e6;
+  --color-zinc-400: #ab97d1;
+  --color-zinc-500: #937cbb;
+  --color-zinc-600: #74599f;
+  --color-zinc-700: #56406f;
+  --color-zinc-800: #3d2957;
+  --color-zinc-900: #2a1a42;
+  --color-zinc-950: #1b0f2e;
+
+  /* emerald → light-yellow highlights */
+  --color-emerald-200: #fef9c3;
+  --color-emerald-300: #fef08a;
+  --color-emerald-400: #fde047;
+  --color-emerald-500: #facc15;
+  --color-emerald-950: #241238;
+
+  /* highlight rgb triple for the .glow-* utilities + scrollbar thumb */
+  --accent-rgb: 253 224 71;
+  --scrollbar-thumb: #56406f;
 }
 
 /*
- * OVE light theme (v6.3).
- *
- * The app is styled with the Tailwind zinc/emerald/rose/amber utilities
- * directly (no semantic tokens for the app chrome), so the light theme is
- * implemented by REMAPPING those palettes under `.light` (next-themes sets
- * the class on <html>):
- *   • zinc is inverted — 950 (page) becomes white, 100 (text) becomes
- *     near-black; borders/hover/panels land on their light equivalents;
- *   • emerald/rose/amber accents are deepened one step so text and buttons
- *     keep WCAG-ish contrast on white (emerald-400 → emerald-600 etc.),
- *     hover states still lighten (emerald-300 → emerald-500);
- *   • the visualization canvas keeps its own black stage by design.
+ * OVE light theme (v6.3) — the white theme on the flip side of the header
+ * tick switch. Same remap technique: zinc is inverted (950 page → white,
+ * 100 text → near-black) and the emerald/rose/amber accents are deepened one
+ * step so text and buttons keep WCAG-ish contrast on white. The dark theme
+ * above is completely independent — flipping the switch swaps both ramps.
  */
 .light {
   color-scheme: light;
 
+  /* accent plumbing for the white theme — deep emerald highlights */
+  --accent-rgb: 5 150 105;
+  --scrollbar-thumb: #d4d4d8;
+
   /* inverted zinc ramp */
   --color-zinc-50: #18181b;
   --color-zinc-100: #18181b;
@@ -161,3 +208,31 @@
     @apply bg-background text-foreground;
   }
 }
+
+/*
+ * Theme-aware accent glows (v6.4). The old hardcoded emerald rgba() shadows
+ * could not follow the palette swap, so every glow now reads --accent-rgb:
+ * light yellow on royal purple in the dark theme, deep emerald on white in
+ * the light theme.
+ */
+.glow-logo {
+  box-shadow: 0 0 16px rgb(var(--accent-rgb) / 0.35);
+}
+.glow-segment {
+  box-shadow: inset 0 0 0 1px rgb(var(--accent-rgb) / 0.35);
+}
+.glow-cta {
+  box-shadow: 0 0 20px rgb(var(--accent-rgb) / 0.25);
+}
+.glow-setbeat {
+  box-shadow: 0 0 24px rgb(var(--accent-rgb) / 0.28);
+}
+.glow-beat-flash {
+  box-shadow: 0 0 18px 4px rgb(var(--accent-rgb) / 0.65);
+}
+.glow-beat-idle {
+  box-shadow: 0 0 8px 1px rgb(var(--accent-rgb) / 0.3);
+}
+.glow-status {
+  box-shadow: 0 0 8px rgb(var(--accent-rgb) / 0.8);
+}

src/app/page.tsx

@@ -40,6 +40,12 @@ function useBeatWatcher() {
 
   useEffect(() => {
     if (!stats) return
+    // No source playing/loaded → beat detection is suspended (v6.4). Also
+    // drop the phase reference so a resumed source can't false-flash.
+    if (stats.source === 'idle') {
+      prevPhaseRef.current = null
+      return
+    }
     const b = stats.beat
     const prev = prevPhaseRef.current
     prevPhaseRef.current = b.phase

src/components/ava/beat-dot.tsx

@@ -22,6 +22,7 @@ export function BeatDot({ size = 44, className }: BeatDotProps) {
   const phase = useAvaStore((s) => s.stats?.beat.phase ?? 0)
   const beatFlash = useAvaStore((s) => s.beatFlash)
   const bpm = useAvaStore((s) => s.stats?.beat.bpm ?? 0)
+  const idle = useAvaStore((s) => s.source) === 'idle'
 
   // flash state is derived: a flash is "on" until its seq is cleared by the
   // hold timeout (setState only ever happens inside the timeout callback)
@@ -47,7 +48,11 @@ export function BeatDot({ size = 44, className }: BeatDotProps) {
       className={cn('relative shrink-0 select-none', className)}
       style={{ width: size, height: size }}
       role="img"
-      aria-label={`Beat indicator — ${bpm > 0 ? `${bpm.toFixed(1)} BPM` : 'no tempo'}${flashSource === 'predicted' ? ', predicted' : ''}`}
+      aria-label={
+        idle
+          ? 'Beat indicator — paused, no audio playing'
+          : `Beat indicator — ${bpm > 0 ? `${bpm.toFixed(1)} BPM` : 'no tempo'}${flashSource === 'predicted' ? ', predicted' : ''}`
+      }
     >
       {/* phase progress ring */}
       <svg width={size} height={size} viewBox={`0 0 ${size} ${size}`} className="absolute inset-0 -rotate-90">
@@ -74,13 +79,16 @@ export function BeatDot({ size = 44, className }: BeatDotProps) {
         />
       </svg>
 
-      {/* filled pulse dot (audio / tap beats) */}
+      {/* filled pulse dot (audio / tap beats) — dimmed while no source is
+          playing/loaded, since beat detection is suspended (v6.4) */}
       <div
         className={cn(
           'absolute left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 rounded-full bg-emerald-400 transition-all duration-150 ease-out',
           flashing && !predicted
-            ? 'opacity-100 shadow-[0_0_18px_4px_rgba(52,211,153,0.65)]'
-            : 'opacity-80 shadow-[0_0_8px_1px_rgba(52,211,153,0.3)]',
+            ? 'glow-beat-flash opacity-100'
+            : idle
+              ? 'opacity-35'
+              : 'glow-beat-idle opacity-80',
         )}
         style={{
           width: dotBase,

src/components/ava/beat-tab.tsx

@@ -30,6 +30,7 @@ export function BeatTab() {
   const beatFlash = useAvaStore((s) => s.beatFlash)
   const beatConfig = useAvaStore((s) => s.beatConfig)
   const setBeatValue = useAvaStore((s) => s.setBeatValue)
+  const source = useAvaStore((s) => s.source)
 
   const beat = stats?.beat
   const bpm = beat?.bpm ?? 0
@@ -37,7 +38,10 @@ export function BeatTab() {
   const beatCount = stats?.beatCount ?? 0
   const lastSource = beatFlash?.source ?? 'none'
 
-  const tapFeedback = lastTap
+  const tapFeedback =
+    source === 'idle'
+      ? 'No audio playing — start a source, then tap along'
+      : lastTap
         ? lastTap.locked
           ? `Locked: ${lastTap.bpm.toFixed(1)} BPM`
           : `Tap ${lastTap.tapCount}… keep tapping`
@@ -74,7 +78,7 @@ export function BeatTab() {
         type="button"
         whileTap={{ scale: 0.965 }}
         onClick={tapBeat}
-        className="flex h-14 w-full flex-col items-center justify-center gap-0.5 rounded-xl bg-emerald-400 font-bold text-emerald-950 shadow-[0_0_24px_rgba(52,211,153,0.28)] transition-colors hover:bg-emerald-300"
+        className="flex h-14 w-full flex-col items-center justify-center gap-0.5 rounded-xl bg-emerald-400 font-bold text-emerald-950 glow-setbeat transition-colors hover:bg-emerald-300"
         title="Tap to set the tempo (or press Space)"
       >
         <span className="flex items-center gap-2 text-sm font-bold tracking-[0.12em]">
@@ -162,7 +166,9 @@ export function BeatTab() {
         <span className="font-semibold text-zinc-400">How it works:</span> beats are detected from the smoothed bass
         energy crossing the sensitivity threshold. Consistent intervals lock a tempo (the confidence meter), and a
         phase-locked predictor then keeps firing beats on the learned grid — shown as a hollow ring with a PRED badge —
-        whenever the bass disappears. <span className="font-semibold text-zinc-400">Set Beat</span> teaches the tempo
+        whenever the bass disappears. Detection and prediction only run while a source is playing —
+        they pause (and the BPM resets) whenever no music is loaded.{' '}
+        <span className="font-semibold text-zinc-400">Set Beat</span> teaches the tempo
         directly: tap along and two or more taps lock the period and phase to your rhythm.
       </p>
     </div>

src/components/ava/detect-tab.tsx

@@ -56,8 +56,10 @@ const BANDS: BandSpec[] = [
     gainKey: 'midGain',
     lowRange: { min: 100, max: 5000, step: 25 },
     highRange: { min: 300, max: 8000, step: 50 },
-    barClass: 'bg-amber-300',
-    textClass: 'text-amber-300',
+    // v6.4: orange (was amber — too close to the yellow bass/highlight in
+    // the royal-purple dark theme; keeps the three VU bands distinct)
+    barClass: 'bg-orange-400',
+    textClass: 'text-orange-400',
   },
   {
     key: 'high',

src/components/ava/footer-bar.tsx

@@ -58,7 +58,9 @@ export function FooterBar() {
             <span
               className={cn(
                 'size-1.5 rounded-full',
-                error ? 'animate-pulse bg-rose-400 shadow-[0_0_8px_rgba(251,113,133,0.8)]' : 'bg-emerald-400 shadow-[0_0_8px_rgba(52,211,153,0.8)]',
+                error
+                  ? 'animate-pulse bg-rose-400 shadow-[0_0_8px_rgba(251,113,133,0.8)]'
+                  : 'glow-status bg-emerald-400',
               )}
               aria-hidden
             />

src/components/ava/header.tsx

@@ -42,7 +42,7 @@ function SourceSegmentButton({
       className={cn(
         'flex h-11 items-center gap-1.5 rounded-md px-3 text-xs font-medium transition-colors',
         active
-          ? 'bg-emerald-400/15 text-emerald-300 shadow-[inset_0_0_0_1px_rgba(52,211,153,0.35)]'
+          ? 'glow-segment bg-emerald-400/15 text-emerald-300'
           : tone === 'stop'
             ? 'text-rose-300/70 hover:bg-zinc-800 hover:text-rose-300'
             : 'text-zinc-400 hover:bg-zinc-800 hover:text-zinc-100',
@@ -179,7 +179,7 @@ export function AppHeader() {
       <div className="mx-auto flex max-w-[1800px] flex-wrap items-center gap-x-3 gap-y-2 px-3 py-2 sm:px-4">
         {/* logo */}
         <div className="order-1 flex items-center gap-2.5">
-          <div className="grid size-9 place-items-center rounded-lg bg-emerald-400 shadow-[0_0_16px_rgba(52,211,153,0.35)]">
+          <div className="glow-logo grid size-9 place-items-center rounded-lg bg-emerald-400">
             <AudioWaveform className="size-5 text-emerald-950" aria-hidden />
           </div>
           <div>

src/components/ava/native-tab.tsx

@@ -21,7 +21,7 @@ export function NativeTab() {
       <a
         href="/api/rust-scaffold"
         download
-        className="flex h-12 items-center justify-center gap-2 rounded-xl bg-emerald-400 font-semibold text-emerald-950 shadow-[0_0_20px_rgba(52,211,153,0.25)] transition-colors hover:bg-emerald-300"
+        className="glow-cta flex h-12 items-center justify-center gap-2 rounded-xl bg-emerald-400 font-semibold text-emerald-950 transition-colors hover:bg-emerald-300"
       >
         <Download className="size-4" />
         Download Rust Scaffold (.zip)

src/components/ava/shared.ts

@@ -1,7 +1,10 @@
 // AVA — shared UI constants & tiny helpers for the components
 
+// v6.4: the Firefox scrollbar thumb color follows the theme via
+// --scrollbar-thumb (royal purple in dark, gray in light) — the WebKit
+// classes below already use the remapped zinc-700 utility.
 export const thinScrollbar =
-  '[scrollbar-width:thin] [scrollbar-color:#52525b_transparent] [&::-webkit-scrollbar]:w-1.5 [&::-webkit-scrollbar-track]:bg-transparent [&::-webkit-scrollbar-thumb]:rounded-full [&::-webkit-scrollbar-thumb]:bg-zinc-700'
+  '[scrollbar-width:thin] [scrollbar-color:var(--scrollbar-thumb)_transparent] [&::-webkit-scrollbar]:w-1.5 [&::-webkit-scrollbar-track]:bg-transparent [&::-webkit-scrollbar-thumb]:rounded-full [&::-webkit-scrollbar-thumb]:bg-zinc-700'
 
 /** 1000 → "1.0 kHz", 100 → "100 Hz" */
 export function fmtHz(v: number): string {

src/lib/ava/beat.ts

@@ -81,6 +81,27 @@ export class BeatTracker {
     return this.beatCount
   }
 
+  /** Constant frame returned while no audio source is playing/loaded. */
+  private static readonly STANDBY_FRAME: BeatFrame = {
+    beat: false,
+    source: 'none',
+    bpm: 0,
+    phase: 0,
+    confidence: 0,
+  }
+
+  /**
+   * Called by the engine every frame while NO audio source is playing or
+   * loaded (v6.4). Beat detection, the prediction grid and any tapped tempo
+   * all stop: the indicator goes dark, the BPM readout resets and everything
+   * learned is dropped — so a stale tempo can never leak ghost beats while
+   * idle (or into the next track once audio starts again).
+   */
+  standby(): BeatFrame {
+    this.reset()
+    return BeatTracker.STANDBY_FRAME
+  }
+
   getBpm(): number {
     return this.bpm
   }

src/lib/ava/engine.ts

@@ -156,7 +156,14 @@ export class AvaEngine {
 
     // ---- audio + beat -----------------------------------------------------
     const levels = this.audio.getBands(this.bandConfig, dt)
-    const beatFrame = this.beat.update(levels.bassAtt, now, dt, this.beatConfig)
+    // Beat detection (and the predictor grid) only runs while a source is
+    // playing/loaded. With no audio, the tracker goes to standby: no beats
+    // fire, the BPM resets to 0 and learned tempo is dropped — so nothing
+    // pulses to ghost beats when the music is stopped (v6.4).
+    const beatFrame =
+      this.audio.kind === 'idle'
+        ? this.beat.standby()
+        : this.beat.update(levels.bassAtt, now, dt, this.beatConfig)
 
     // ---- environment ------------------------------------------------------
     const env = this.env

src/lib/version.ts

@@ -7,6 +7,9 @@
 // (v6.0 = rename to Open Visualization Engine + version indicator).
 //
 // History:
+//   6.4 — beat detection suspends when no music is playing/loaded (no ghost
+//         beats after Stop, BPM resets) + dark theme restyle: royal purple
+//         chrome with light-yellow highlights
 //   6.3 — light/dark theme tick switch in the header (white theme via .light
 //         palette remap; per-visitor, persisted by next-themes)
 //   6.2 — security hardening: read-only embedded library (server refuses all
@@ -19,4 +22,4 @@
 
 export const APP_NAME = 'Open Visualization Engine'
 export const APP_SHORT = 'OVE'
-export const APP_VERSION = '6.3'
+export const APP_VERSION = '6.4'

worklog.md

@@ -1234,3 +1234,72 @@ Stage Summary:
 - Implementation note for future styling: new UI should keep using the
   zinc/emerald utilities (not raw hex) so both themes keep working; anything
   on the emerald buttons should use text-emerald-950.
+
+---
+Task ID: 16
+Agent: main (Z.ai Code)
+Task: v6.4 — (a) beat detection stops when no music is playing/loaded; (b) dark theme restyled to royal purple with light-yellow highlights
+
+Work Log:
+- Root cause of ghost beats: AvaEngine.loop fed BeatTracker.update() every frame
+  regardless of audio state, and the phase-locked predictor keeps firing after
+  confidence builds (music just stopped) or after Set Beat taps (taps block the
+  confidence decay path) — so the indicator pulsed to a stale grid with no source.
+- src/lib/ava/beat.ts — new standby(): full reset + returns a constant
+  STANDBY_FRAME {beat:false, source:'none', bpm:0, phase:0, confidence:0}.
+  Called every idle frame; drops everything learned so stale tempo can never
+  leak ghost beats while idle OR into the next track (source switches relearn
+  fresh — a feature).
+- src/lib/ava/engine.ts — loop gates the tracker: audio.kind === 'idle' →
+  standby(), else update(). env.beat/bpm/beatphase/beatconf go to 0 while idle;
+  stats.source still reports the kind.
+- src/app/page.tsx — useBeatWatcher: early return on stats.source === 'idle'
+  (also drops prevPhaseRef so a resumed source can't false-flash).
+- src/components/ava/beat-dot.tsx — dot dims to opacity-35 (no glow) while
+  idle (flashes still override), aria-label "Beat indicator — paused, no audio
+  playing"; theme-aware glow-beat-flash/glow-beat-idle classes.
+- src/components/ava/beat-tab.tsx — Set Beat feedback while idle: "No audio
+  playing — start a source, then tap along"; SET BEAT glow class; "How it
+  works" documents the new pause behavior.
+- Theme (dark → royal purple + light yellow), same proven remap technique as
+  v6.3 .light — src/app/globals.css .dark block rewritten:
+  • semantic tokens: background #1b0f2e, card/popover #2a1a42, secondary
+    #35244e, border/input #453063, primary/ring #fde047 (+purple foreground
+    #241238), chart/sidebar purple-yellow family → dialogs/toasts/sliders/
+    switches follow.
+  • zinc ramp → royal purple: 950 #1b0f2e (page/header/footer), 900 #2a1a42
+    (panels/tabs), 800 #3d2957 (borders/tracks), 700 #56406f, 600 #74599f,
+    500 #937cbb … 50 #f5f1fb (lavender text ramp).
+  • emerald → light yellow: 200 #fef9c3, 300 #fef08a, 400 #fde047 (CTAs, BPM,
+    active states, beat dot), 500 #facc15, 950 #241238 (deep purple text on
+    yellow buttons — the yellow CTAs' label color).
+  • new --accent-rgb (253 224 71 dark / 5 150 105 light) + --scrollbar-thumb
+    (also defaulted in :root); seven .glow-* utilities (logo, segment, cta,
+    setbeat, beat-flash, beat-idle, status) replace ALL hardcoded emerald
+    rgba() shadows (7 spots, 6 files) so glows follow the theme; Firefox
+    scrollbar-color now var-driven (shared.ts).
+  • light theme untouched apart from the two new vars — verified intact.
+- src/components/ava/detect-tab.tsx — Mid band VU amber-300 → orange-400
+  (amber was indistinguishable from the new yellow bass/highlight; three
+  bands now yellow / orange / rose in dark, green / orange / rose in light).
+- src/lib/version.ts → 6.4 (+history line). bun run lint clean.
+
+Stage Summary:
+- E2E (agent-browser, 1440×900 + 390×844), ALL PASS:
+  • Beat: demo + 5× Set Beat taps → locks 120.2 BPM, predictor carries;
+    Stop → ZERO ghost flashes over 8 s (previously ~16 predicted beats),
+    BPM "—", beat count 0, dot dimmed 0.35, aria "paused, no audio playing";
+    idle taps = one flash each, no sustained grid, honest feedback text.
+  • Demo auto-detect staying unlocked is PRE-EXISTING documented behavior
+    (worklog Task 8: demo bassline keeps rolling average high; Set Beat /
+    real music lock fine) — not a v6.4 regression.
+  • Dark: body #1b0f2e, logo tile/BPM/Native CTA/beat dot #fde047, CTA text
+    #241238, footer micro text lavender #937cbb/#c9b8e6 (VLM "gray" note was
+    the intentional muted style), VU bands distinct, zero console errors.
+  • Light: white body, emerald-600 accents, emerald glow — no yellow leakage.
+  • Mobile: no horizontal scroll, footer flush at viewport bottom when
+    scrolled to end; VLM review of dark+mobile screenshots: cohesive royal
+    purple + light yellow, no breakage.
+- New styling rule going forward: keep using zinc/emerald utilities (they are
+  the remap surface); on yellow CTAs always text-emerald-950; for accent glows
+  use the .glow-* classes, never rgba() literals.