Player: light/dark theme so the device stands out from the background

The device case was nearly the same tone as the room — the body's
radial-gradient even peaked *lighter* than the case — so the unit blended
into the background. Added a theme toggle mirroring the editor (◐/☀/☾,
cycles system → light → dark, shares the "metronome.theme" key, with a
pre-paint head script to avoid a flash) and reworked the palette around it:

- dark: a charcoal device sits a clear step lighter than a near-black room,
  with a rim highlight + drop shadow + faint cyan glow so it reads as an object;
- light: the dark device sits on a bright "desk" card (panel + fields go light).

Device internals (OLED, beat LEDs, buttons, knob, screws) keep fixed
dark-hardware colours in both themes via --dtxt/--dmuted, so only the
environment switches.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

player.html

@@ -16,29 +16,57 @@
   Audio here is the synthesized voice set (the firmware uses the same scheduler;
   on hardware the voices map to CC0 samples on the I2S DAC). One file, no deps.
 -->
+<script>
+  // Set theme before first paint (avoids a flash). Shares the editor's "metronome.theme".
+  (function(){ try{
+    var p = localStorage.getItem("metronome.theme");
+    if (p!=="light" && p!=="dark" && p!=="system") p = "system";
+    document.documentElement.dataset.theme = p==="system" ? (matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark") : p;
+  } catch(e){ document.documentElement.dataset.theme = "dark"; } })();
+</script>
 <style>
   /*@BUILD:include:src/base.css@*/
   :root{
-    --case:#1b1f27; --case2:#11141a; --edge:#0b0d11; --bezel:#0a0c10;
+    /* environment (themed): room background + page/panel chrome */
-    --txt:#c7d0db; --muted:#7f8b9a; --cyan:#0AB3F7; --amber:#ffd166;
+    --bg1:#12151c; --bg2:#05070a;
+    --txt:#c7d0db; --muted:#7f8b9a; --link:#6cb6ff;
+    --panel-bg:#171b22; --panel-bd:#2a313c; --field-bg:#0e1116; --field-bd:#222a36;
+    /* the device case — kept a clear step lighter than the room so it reads as an object */
+    --case:#232a36; --case2:#151a22; --device-bd:#39434f;
+    --device-shadow:0 0 0 1px rgba(120,150,190,.06), 0 30px 70px rgba(0,0,0,.62), 0 0 46px rgba(10,179,247,.05);
+    /* device internals — fixed dark-hardware colours in BOTH themes */
+    --dtxt:#c7d0db; --dmuted:#7f8b9a;
+    --cyan:#0AB3F7; --amber:#ffd166; --edge:#0b0d11; --bezel:#0a0c10;
     --screen:#04140f; --phos:#34e0a0; --phos-dim:#1f6e54; --led-off:#1b2a23;
   }
+  :root[data-theme="light"]{
+    /* light "desk": the dark device sits on a bright surface → strong contrast */
+    --bg1:#f5f8fc; --bg2:#dde4ec;
+    --txt:#1e2630; --muted:#5c6776; --link:#1769c4;
+    --panel-bg:#ffffff; --panel-bd:#d2dae4; --field-bg:#f1f4f8; --field-bd:#cdd6e0;
+    --case:#2b3340; --case2:#1b212b; --device-bd:#0f141b;
+    --device-shadow:0 0 0 1px rgba(0,0,0,.05), 0 26px 50px rgba(20,30,50,.30);
+  }
   body{
     margin:0; min-height:100vh; padding:28px 16px 48px;
-    background:radial-gradient(circle at 50% -8%, #20242c, #0c0e12);
+    background:radial-gradient(circle at 50% -8%, var(--bg1), var(--bg2));
     color:var(--txt);
     display:flex; flex-direction:column; align-items:center; gap:20px;
   }
-  a{color:#6cb6ff}
+  a{color:var(--link)}
   .topbar{width:100%; max-width:560px; display:flex; align-items:center; justify-content:space-between; font-size:13px; color:var(--muted)}
   .topbar b{color:var(--txt)}
+  .topbar-right{ display:flex; align-items:center; gap:12px }
+  .tbtn{ background:transparent; color:var(--muted); border:1px solid var(--panel-bd); border-radius:8px;
+    padding:3px 9px; font-size:14px; line-height:1; cursor:pointer }
+  .tbtn:hover{ color:var(--txt) }
 
   /* ---- the device ---- */
   .device{
     width:100%; max-width:560px; position:relative;
     background:linear-gradient(180deg,var(--case),var(--case2));
-    border:1px solid #2a313c; border-radius:22px; padding:22px 22px 26px;
+    border:1px solid var(--device-bd); border-radius:22px; padding:22px 22px 26px;
-    box-shadow:0 26px 60px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.05), inset 0 -2px 8px rgba(0,0,0,.6);
+    box-shadow:var(--device-shadow), inset 0 1px 0 rgba(255,255,255,.06), inset 0 -2px 8px rgba(0,0,0,.55);
   }
   .device::before, .device::after,
   .device .screw{ content:""; position:absolute; width:9px; height:9px; border-radius:50%;
@@ -50,8 +78,8 @@
   .logo{ display:flex; align-items:baseline; gap:9px }
   .logo .vk{ font-weight:800; letter-spacing:.22em; color:#fff; font-size:17px;
     background:var(--cyan); padding:2px 8px; border-radius:4px; box-shadow:0 0 10px rgba(10,179,247,.5) }
-  .logo .model{ color:var(--muted); font-size:12px; letter-spacing:.04em }
+  .logo .model{ color:var(--dmuted); font-size:12px; letter-spacing:.04em }
-  .pwr{ display:flex; align-items:center; gap:7px; font-size:10px; color:var(--muted); text-transform:uppercase; letter-spacing:.12em }
+  .pwr{ display:flex; align-items:center; gap:7px; font-size:10px; color:var(--dmuted); text-transform:uppercase; letter-spacing:.12em }
   .pwr .dot{ width:8px; height:8px; border-radius:50%; background:#2fe07a; box-shadow:0 0 8px #2fe07a }
 
   /* ---- OLED ---- */
@@ -84,44 +112,48 @@
 
   /* ---- controls ---- */
   .controls{ display:flex; align-items:center; justify-content:center; gap:12px; margin:14px 4px 4px; flex-wrap:wrap }
-  .btn{ background:linear-gradient(180deg,#2b323d,#1b212a); color:var(--txt); border:1px solid #39424f;
+  .btn{ background:linear-gradient(180deg,#2b323d,#1b212a); color:var(--dtxt); border:1px solid #39424f;
     border-radius:11px; padding:12px 14px; font-size:15px; cursor:pointer; min-width:48px;
     box-shadow:0 3px 0 #0c0f14, inset 0 1px 0 rgba(255,255,255,.06); user-select:none; transition:transform .04s, box-shadow .04s }
   .btn:active{ transform:translateY(2px); box-shadow:0 1px 0 #0c0f14, inset 0 1px 0 rgba(255,255,255,.06) }
-  .btn small{ display:block; font-size:9px; color:var(--muted); letter-spacing:.08em; margin-top:2px }
+  .btn small{ display:block; font-size:9px; color:var(--dmuted); letter-spacing:.08em; margin-top:2px }
   .btn.play{ min-width:74px; font-size:20px; background:linear-gradient(180deg,#1f7a4d,#155f3b); border-color:#2e7d32; color:#eafff3 }
   .btn.play.on{ background:linear-gradient(180deg,#b23b3b,#8f2d2d); border-color:#c0392b }
   .knob{ width:52px; height:52px; border-radius:50%; background:radial-gradient(circle at 38% 32%,#3a424e,#171b22 72%);
     border:1px solid #444c58; box-shadow:0 3px 8px rgba(0,0,0,.5), inset 0 1px 1px rgba(255,255,255,.08); position:relative; margin-left:4px }
   .knob::after{ content:""; position:absolute; left:50%; top:6px; width:2px; height:13px; background:var(--cyan);
     border-radius:2px; transform-origin:50% 20px; transform:rotate(var(--a,0deg)); box-shadow:0 0 5px var(--cyan) }
-  .knob-wrap{ display:flex; flex-direction:column; align-items:center; gap:4px; font-size:9px; color:var(--muted); letter-spacing:.1em }
+  .knob-wrap{ display:flex; flex-direction:column; align-items:center; gap:4px; font-size:9px; color:var(--dmuted); letter-spacing:.1em }
 
   /* ---- speaker grille ---- */
   .grille{ height:14px; margin:18px 6px 2px; border-radius:6px;
     background:radial-gradient(circle, #000 1.1px, transparent 1.4px) 0 0/9px 9px; opacity:.5 }
 
   /* ---- load panel ---- */
-  .panel{ width:100%; max-width:560px; background:#171b22; border:1px solid #2a313c; border-radius:14px; padding:16px }
+  .panel{ width:100%; max-width:560px; background:var(--panel-bg); border:1px solid var(--panel-bd); border-radius:14px; padding:16px }
   .panel h2{ margin:0 0 4px; font-size:15px }
   .panel p.sub{ margin:0 0 12px; font-size:12px; color:var(--muted); line-height:1.45 }
   .panel label{ font-size:12px; color:var(--muted); display:block; margin:10px 0 5px }
-  textarea{ width:100%; background:#0e1116; color:var(--txt); border:1px solid var(--edge); border-radius:9px;
+  textarea{ width:100%; background:var(--field-bg); color:var(--txt); border:1px solid var(--field-bd); border-radius:9px;
     padding:10px; font-family:"Courier New",monospace; font-size:12px; resize:vertical; min-height:58px }
-  select, .ld{ background:#0e1116; color:var(--txt); border:1px solid #39424f; border-radius:9px; padding:8px 10px; font-size:13px }
+  select, .ld{ border-radius:9px; padding:8px 10px; font-size:13px }
-  .ld{ cursor:pointer; background:linear-gradient(180deg,#2b323d,#1b212a) }
+  select{ background:var(--field-bg); color:var(--txt); border:1px solid var(--field-bd) }
+  .ld{ cursor:pointer; color:var(--dtxt); background:linear-gradient(180deg,#2b323d,#1b212a); border:1px solid #39424f }
   .row{ display:flex; gap:8px; align-items:center; flex-wrap:wrap; margin-top:8px }
   .status{ margin-top:10px; font-size:12px; min-height:1.2em; font-family:"Courier New",monospace }
   .status.ok{ color:#5fd08a } .status.err{ color:#ff7a7a }
   .hint{ font-size:11px; color:var(--muted) }
-  code{ background:#0e1116; border:1px solid var(--edge); border-radius:4px; padding:1px 5px; font-size:11px }
+  code{ background:var(--field-bg); border:1px solid var(--field-bd); border-radius:4px; padding:1px 5px; font-size:11px }
 </style>
 </head>
 <body>
 
 <div class="topbar">
   <span><b>VARASYS PM‑1</b> · hardware player (mockup)</span>
-  <a href="/index.html">Open editor ↗</a>
+  <span class="topbar-right">
+    <button id="themeBtn" class="tbtn" title="toggle light / dark theme">☀</button>
+    <a href="/index.html">Open editor ↗</a>
+  </span>
 </div>
 
 <!-- ===================== THE DEVICE ===================== -->
@@ -333,6 +365,20 @@ $("bLoad").onclick=()=>loadConfig($("cfg").value);
 $("storedSel").onchange=(e)=>{ const v=e.target.value; if(!v) return;
   const sl = v[0]==="b" ? e.target._builtin[+v.slice(1)] : e.target._lists[+v.slice(1)]; if(!sl) return;
   loadSetlistObj({title:sl.title,items:(sl.items||[]).map(it=>({...it}))}); setStatus("✓ Loaded set list “"+(sl.title||"set list")+"”.",true); };
+/* theme toggle — cycles system → light → dark; shares the editor's "metronome.theme" key */
+const THEMES = ["system","light","dark"];
+function effectiveTheme(p){ return p==="system" ? (matchMedia("(prefers-color-scheme: light)").matches?"light":"dark") : p; }
+function themePref(){ try{ const p=localStorage.getItem("metronome.theme"); return (p==="light"||p==="dark"||p==="system")?p:"system"; }catch(e){ return "system"; } }
+function applyTheme(p){
+  try{ localStorage.setItem("metronome.theme",p); }catch(e){}
+  document.documentElement.dataset.theme = effectiveTheme(p);
+  $("themeBtn").textContent = p==="system" ? "◐" : p==="light" ? "☀" : "☾";
+  $("themeBtn").title = "Theme: "+p+" (click to cycle: system → light → dark)";
+}
+$("themeBtn").onclick = ()=> applyTheme(THEMES[(THEMES.indexOf(themePref())+1)%THEMES.length]);
+matchMedia("(prefers-color-scheme: light)").addEventListener("change", ()=>{ if(themePref()==="system") applyTheme("system"); });
+applyTheme(themePref());
+
 addEventListener("keydown",(e)=>{
   const t=e.target, tag=t?t.tagName:""; if(tag==="TEXTAREA"||tag==="INPUT"||tag==="SELECT") return;
   const k=e.key;