/* Piano Practice: dark, soft-beveled theme. Judging colours (green / pale yellow-green / amber / red)
   are the same everywhere: keys, blocks, staff notes and fingers. */
:root{
  --bg:#0f1220; --bg2:#151a2e; --panel:#1b2138; --panel2:#222a45; --edge:#2e3756; --edge-hi:rgba(255,255,255,.07);
  --ink:#e8ecf7; --muted:#9aa4c2; --line:#343e60; --accent:#7c8cff; --accent2:#5b6cff; --glow:rgba(124,140,255,.45);
  --target:#3b82f6; --target-key:#cfe0ff;
  --ok:#22c55e; --ok-key:#4ade80;
  --soft:#a3c41a; --soft-key:#dcef8f;
  --loud:#f2a516; --loud-key:#f2a516;
  --wrong:#f05252; --wrong-key:#ef4444;
  --radius:14px;
  --shadow:0 8px 24px rgba(0,0,0,.35), inset 0 1px 0 var(--edge-hi);
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{margin:0;min-height:100vh;color:var(--ink);font:15px/1.4 "Segoe UI",system-ui,sans-serif;
  background:radial-gradient(1200px 600px at 20% -10%,#1d2547 0%,transparent 60%),radial-gradient(900px 500px at 100% 0%,#22183d 0%,transparent 55%),var(--bg)}
select,button,input{font:inherit;color:inherit}
a{color:var(--accent)}

/* bars */
header,#recBar,#midiBar,#gameBar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:8px 14px 0;padding:9px 16px;
  background:linear-gradient(180deg,var(--panel2),var(--panel));border:1px solid var(--edge);border-radius:var(--radius);box-shadow:var(--shadow)}
header{margin-top:10px}
body.mode-game #recBar{display:none}
#gameBar .rec-btn{min-width:118px}
#gameBar .rec-msg:empty{display:none}
#gameBar .rec-msg{flex-basis:100%;order:20}
h1{font-size:19px;margin:0 10px 0 0;letter-spacing:.2px;background:linear-gradient(90deg,#c7d0ff,#9fb4ff 40%,#d6b8ff);-webkit-background-clip:text;background-clip:text;color:transparent}
select{padding:5px 8px;border:1px solid var(--edge);border-radius:9px;background:#11162a;max-width:440px;box-shadow:inset 0 1px 2px rgba(0,0,0,.4)}
select option{background:#161c33}
.btn{padding:6px 14px;border:1px solid #6b7bff;border-radius:10px;cursor:pointer;color:#fff;
  background:linear-gradient(180deg,#7b8bff,#5466f0);box-shadow:0 2px 8px rgba(84,102,240,.35),inset 0 1px 0 rgba(255,255,255,.3);transition:filter .15s,transform .05s}
@media (hover:hover){.btn:hover{filter:brightness(1.08)}}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:linear-gradient(180deg,#283152,#1f2643);border-color:var(--edge);color:var(--ink);box-shadow:inset 0 1px 0 var(--edge-hi),0 2px 6px rgba(0,0,0,.25)}
.btn.small{padding:3px 10px;font-size:13px;border-radius:8px}
.btn.big{font-size:19px;font-weight:700;padding:9px 28px;border-radius:999px;min-width:150px}
.btn.primary{background:linear-gradient(180deg,#4ade80,#16a34a);border-color:#4ade80;color:#06240f;box-shadow:0 0 0 0 transparent,0 4px 16px rgba(34,197,94,.35),inset 0 1px 0 rgba(255,255,255,.45)}
.btn.primary.running{background:linear-gradient(180deg,#334066,#262f50);border-color:#55618d;color:#fff;box-shadow:inset 0 1px 0 var(--edge-hi)}
.muted{color:var(--muted);font-size:13px}
.good{color:var(--ok-key);font-weight:600}

.seg{display:inline-flex;border:1px solid var(--edge);border-radius:11px;overflow:hidden;background:#11162a;box-shadow:inset 0 1px 3px rgba(0,0,0,.45);padding:2px;gap:2px}
.seg button{border:0;background:transparent;padding:5px 13px;cursor:pointer;border-radius:8px;color:var(--muted)}
@media (hover:hover){.seg button:hover{color:var(--ink)}}
.seg button.active{background:linear-gradient(180deg,#5d6dff,#4152e0);color:#fff;box-shadow:0 0 10px var(--glow),inset 0 1px 0 rgba(255,255,255,.3)}

/* toggle switches (a real checkbox underneath, so keyboard and tests still work) */
.switch{position:relative;display:inline-flex;align-items:center;gap:8px;cursor:pointer;color:var(--ink);user-select:none}
.switch input{position:absolute;left:0;top:50%;opacity:0;width:1px;height:1px;margin:0}
.switch .track{position:relative;width:38px;height:22px;border-radius:999px;background:#0d1122;border:1px solid var(--edge);box-shadow:inset 0 1px 3px rgba(0,0,0,.6);transition:background .2s}
.switch .track::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:linear-gradient(180deg,#f3f5ff,#b9c1de);box-shadow:0 1px 3px rgba(0,0,0,.5);transition:transform .2s}
.switch input:checked + .track{background:linear-gradient(180deg,#6a7bff,#4a5bea);border-color:#7c8cff;box-shadow:0 0 8px var(--glow),inset 0 1px 2px rgba(0,0,0,.3)}
.switch input:checked + .track::after{transform:translateX(16px)}
.switch input:focus-visible + .track{outline:2px solid var(--accent);outline-offset:2px}
.loop{color:var(--ink)}

#midiBar{font-size:14px;padding:7px 16px}
#midiBar .hint{flex-basis:100%;color:var(--muted);font-size:12.5px}
#midiStatus.error{color:var(--wrong);font-weight:600}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block;background:#6b7280}
.dot.ok{background:#22c55e;box-shadow:0 0 6px #22c55e}.dot.error{background:var(--wrong)}.dot.wait{background:#f59e0b}
.dot.flash{box-shadow:0 0 0 4px rgba(124,140,255,.55)}

main{padding:10px 14px 30px}
#instruction{font-size:21px;min-height:32px;margin:2px 4px 6px}
#instruction .big{font-weight:700;color:#9fc0ff}
#instruction .bad{color:var(--wrong)}
#instruction .done{color:var(--ok-key);font-weight:700}

/* the staff stays on light "paper" so the notation is easy to read */
#staff{background:linear-gradient(180deg,#fdfcf8,#f3f1ea);border:1px solid #c9c5b8;border-radius:var(--radius);min-height:100px;overflow:hidden;
  box-shadow:0 8px 22px rgba(0,0,0,.35),inset 0 1px 0 #fff}
#staff svg{display:block}
#staff .playhead{fill:#3b82f6;opacity:.55}

#keyboardWrap{margin-top:12px;padding:8px;border-radius:var(--radius);border:1px solid var(--edge);
  background:linear-gradient(180deg,#1a2037,#121628);box-shadow:var(--shadow)}
#laneWrap{position:relative}
#laneWrap[hidden]{display:none}
#lanes{display:block;width:100%;height:240px;border-radius:10px 10px 0 0;
  background:linear-gradient(180deg,#0b0e1c 0%,#151a33 70%,#1b2142 100%);box-shadow:inset 0 0 0 1px rgba(255,255,255,.05)}
#keyboard{display:block;width:100%;height:auto;user-select:none;touch-action:none;border-radius:0 0 8px 8px;
  filter:drop-shadow(0 3px 4px rgba(0,0,0,.45))}
#keyboard .white{fill:#fbfbfd;stroke:#7b8196;stroke-width:1;transition:fill .45s ease-out}
#keyboard .black{fill:#14161f;stroke:#05060a;stroke-width:1;transition:fill .45s ease-out}
#keyboard .white.target{fill:var(--target-key);stroke:var(--target);stroke-width:3}
#keyboard .black.target{fill:#2f5fcf;stroke:#93c5fd;stroke-width:2}
#keyboard .clabel{font:9px sans-serif;fill:#8b90a5;pointer-events:none}
#keyboard rect{cursor:pointer}
#hands{display:block;width:100%;height:auto;margin-top:4px;overflow:visible}
#hands .hand.idle{opacity:.38}
#hands .hand-name{font:700 10px "Segoe UI",sans-serif;letter-spacing:1.5px;opacity:.6}
#hands .finger-num{font:800 12px "Segoe UI",sans-serif;pointer-events:none}
#hands .finger-lit{transition:fill .12s}
body.no-fx #hands .finger-lit{transition:none}

#legend{display:flex;flex-wrap:wrap;gap:14px;margin:10px 4px;font-size:13px;color:var(--muted)}
#legend .game-only{display:none}
body.mode-game #legend .game-only{display:inline}
.sw{display:inline-block;width:14px;height:14px;border-radius:4px;border:1px solid rgba(255,255,255,.25);vertical-align:-2px;margin-right:5px}

#summary{position:relative;background:linear-gradient(180deg,#232b4a,#1b2240);border:1px solid var(--edge);border-left:5px solid var(--ok);border-radius:var(--radius);
  padding:12px 34px 12px 16px;margin:10px 0;max-width:660px;box-shadow:var(--shadow)}
#summary h3{margin:0 0 6px;font-size:16px}
#summary ul{margin:0 0 8px;padding-left:18px}
#summary li{margin:2px 0}
#laneWrap #summary h3{font-size:15px;margin-bottom:3px}
#laneWrap #summary li{margin:1px 0}
#summary .close-x{position:absolute;top:6px;right:8px;border:0;background:none;color:var(--muted);font-size:20px;cursor:pointer;line-height:1}
#laneWrap #summary{position:absolute;top:8px;right:12px;margin:0;max-width:440px;max-height:calc(100% - 16px);overflow:auto;font-size:13.5px;padding:8px 30px 8px 14px;background:rgba(27,34,64,.94);backdrop-filter:blur(4px)}

#testInput{margin-top:16px;font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px;align-items:center}
#testInput label{margin-left:12px;display:flex;align-items:center;gap:6px}
kbd{border:1px solid var(--edge);border-bottom-width:2px;border-radius:5px;padding:0 5px;background:#1d2440;font-size:12px;color:var(--ink)}

/* game bar */
#gameBar[hidden]{display:none}
#gameBar .bpm{display:flex;align-items:center;gap:8px}
#gameBar .bpm b{font-size:18px;min-width:30px;text-align:right;font-variant-numeric:tabular-nums}
.scorebox{margin-left:auto;display:flex;gap:16px;font-size:15px;color:var(--muted)}
.scorebox b{color:var(--ink);font-size:20px;font-variant-numeric:tabular-nums;margin-left:4px}
input[type=range]{accent-color:#7c8cff;width:150px}

/* compact layout in game mode so everything fits on one screen */
body.mode-game #midiBar .hint{display:none}
body.mode-game.midi-ok #midiBar{display:none}
body.mode-game #midiBar{padding:5px 16px}
body.mode-game #instruction{font-size:18px;min-height:26px;margin:0 4px 6px}
body.mode-game .rec-btn{padding:7px 18px;font-size:16px}
body.mode-game #keyboardWrap{margin-top:8px}

/* settings */
#settings{position:fixed;inset:0;background:rgba(5,7,15,.6);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;z-index:10}
#settings[hidden]{display:none}
.panel{background:linear-gradient(180deg,#232b4a,#1a2039);border:1px solid var(--edge);border-radius:18px;padding:0;min-width:340px;width:min(620px,94vw);max-height:90vh;display:flex;flex-direction:column;box-shadow:0 20px 50px rgba(0,0,0,.55),inset 0 1px 0 var(--edge-hi)}
.panel-head{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-bottom:1px solid var(--edge)}
.panel-body{overflow:auto;padding:6px 20px 16px}
.panel section{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.panel section:last-child{border-bottom:0}
.panel h2{margin:0;font-size:19px}
.panel h3{margin:0 0 6px;font-size:15px;color:#c7d0ff}
.panel p{margin:6px 0;color:var(--muted);font-size:13px}
.panel table{border-collapse:collapse;margin-bottom:10px}
.panel td,.panel th{padding:3px 10px;text-align:left}
.panel td:first-child{font:italic bold 17px "Times New Roman",serif}
.panel input[type=number]{width:70px;padding:3px 6px;border:1px solid var(--edge);border-radius:7px;background:#11162a}
.panel .srow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:8px 0}
.panel .srow label{display:flex;align-items:center;gap:6px}
#voiceRows.off{opacity:.45}

/* recording */
#recBar.recording{background:linear-gradient(180deg,#3a1d2a,#2b1622);border-color:#7f2d3d}
.rec-btn{display:inline-flex;align-items:center;gap:9px;padding:8px 20px;font-size:17px;font-weight:700;border-radius:999px;border:1px solid #f87171;
  background:linear-gradient(180deg,#ef4444,#c81e1e);color:#fff;cursor:pointer;min-width:130px;justify-content:center;box-shadow:0 3px 12px rgba(239,68,68,.35),inset 0 1px 0 rgba(255,255,255,.35)}
@media (hover:hover){.rec-btn:hover{filter:brightness(1.08)}}
.rec-btn .rec-icon{width:14px;height:14px;border-radius:50%;background:#fff;display:inline-block}
.rec-btn.recording{background:linear-gradient(180deg,#fff,#f1e4e6);color:#c81e1e}
.rec-btn.recording .rec-icon{border-radius:2px;background:#dc2626}
.rec-btn:disabled{opacity:.6;cursor:wait}
.rec-timer{font:700 20px/1 "Segoe UI",system-ui,sans-serif;color:#f87171;font-variant-numeric:tabular-nums;display:inline-flex;align-items:center;gap:7px}
.rec-timer::before{content:"";width:12px;height:12px;border-radius:50%;background:#ef4444;animation:recblink 1s steps(2,start) infinite}
@keyframes recblink{to{visibility:hidden}}
.rec-name{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:14px}
.rec-name input{width:150px;padding:4px 8px;border:1px solid var(--edge);border-radius:8px;background:#11162a}
.rec-msg{font-size:15px}
.rec-msg.ok{color:var(--ok-key);font-weight:600}
.rec-msg.warn{color:var(--loud);font-weight:600}
.rec-msg.err{color:var(--wrong);font-weight:600}
.rec-msg a.btn{text-decoration:none;margin-left:6px;font-weight:400}
.server-status{font-size:12.5px;color:var(--muted);margin-left:auto}
.server-status.bad{color:var(--wrong)}
#recentTakes{font-size:13px;color:var(--muted)}
#recentTakes summary{cursor:pointer}
#recentTakes ul{margin:4px 0 0;padding-left:18px;max-height:160px;overflow:auto}
.rec-timer[hidden],#recentTakes[hidden]{display:none}
.rec-msg .warn{color:var(--loud);font-weight:600}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important}
  .rec-timer::before{animation:none}
}

/* ---------- built-in piano ---------- */
.piano-quick{font-size:14px}
.piano-status{font-size:13px;color:var(--muted);padding:2px 10px;border-radius:999px;border:1px solid transparent}
.piano-status.ok{color:#a7f3c0}
.piano-status.wait{color:var(--muted)}
.piano-status.err{color:#fca5a5}
.piano-status.tap{color:#fde68a;border-color:#a16207;background:rgba(161,98,7,.15)}
.piano-status.tap.nudge{animation:pnudge 1s ease-in-out 3}
@keyframes pnudge{50%{background:rgba(250,204,21,.35)}}
body.no-fx .piano-status.tap.nudge{animation:none}
body.mode-game.midi-ok #midiBar.piano-tap{display:flex}
.piano-notice{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:50;max-width:min(760px,94vw);background:var(--panel2);
  border:1px solid var(--accent);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px 16px;font-size:14px;line-height:1.6}
.piano-notice .btn{margin-left:6px}
#pianoSettings.off .srow{opacity:.45}
.panel .credits{font-size:12.5px;color:var(--muted)}
.panel .credits a,#credits a{color:var(--accent)}
#credits{margin:18px 14px 12px;font-size:12px;color:var(--muted);text-align:center}


/* ================= web / touch build (iPhone, iPad, any static host) ================= */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color:transparent;overflow-x:hidden}
button,a,select,label,input,.tk{touch-action:manipulation}
.touch-only{display:none}
body.no-webmidi .touch-only{display:inline}
body.no-webmidi #testInput .desk-only{display:none}
.rec-sub{display:block;margin-top:4px;color:var(--muted);font-size:13px;font-weight:400}
.rec-msg a.btn,.rec-msg button.btn{display:inline-flex;align-items:center;margin:4px 0 0 6px;font-weight:600}
#recentTakes li{margin:6px 0;display:flex;flex-wrap:wrap;align-items:center;gap:6px}
#recentTakes li .btn{text-decoration:none;font-size:13px;padding:4px 10px}
.sound-gate .gate-sub{max-width:520px}

/* "no Web MIDI" banner */
.banner{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:8px 14px 0;padding:10px 16px;border-radius:var(--radius);
  background:linear-gradient(180deg,#2b2a17,#221f12);border:1px solid #a16207;color:#fde68a;font-size:14.5px;line-height:1.45;box-shadow:var(--shadow)}
.banner[hidden]{display:none}
.banner .banner-text{flex:1 1 300px}
.banner b{color:#fff3c4}
.banner summary{cursor:pointer;list-style:none;min-height:24px}
.banner summary::-webkit-details-marker{display:none}
.banner .banner-more{color:#fff3c4;text-decoration:underline;white-space:nowrap}
.banner details[open] .banner-more{display:none}
.banner p{margin:6px 0 0;color:#e9d9a0}
@media (pointer:coarse){.banner summary{padding:8px 0}}
/* no Web MIDI: the port picker is useless, keep only the piano status */
body.no-webmidi #midiBar > :not(#pianoStatus){display:none}
body.no-webmidi #midiBar{padding:4px 10px}
body.no-webmidi #midiBar:has(#pianoStatus.ok),body.no-webmidi.gate-open #midiBar{display:none}

/* big "tap to turn on sound" button (touch screens / no-MIDI browsers) */
.sound-gate{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;flex-direction:column;align-items:center;gap:6px;
  padding:14px 16px calc(14px + env(safe-area-inset-bottom));background:linear-gradient(180deg,rgba(15,18,32,.0),rgba(15,18,32,.92) 30%);
  font-size:13px;color:var(--muted);text-align:center}
.sound-gate[hidden]{display:none}
.sound-gate .btn.big{min-height:56px;font-size:19px;width:min(440px,92vw)}
body.gate-open main{padding-bottom:140px}

/* on-screen tap keys */
#tapKeys{margin-top:10px;padding:8px;border-radius:var(--radius);border:1px solid var(--edge);background:linear-gradient(180deg,#1a2037,#121628);box-shadow:var(--shadow)}
#tapKeys[hidden]{display:none}
.tk-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 2px 8px}
.tk-range{font-weight:700;min-width:84px;text-align:center;font-variant-numeric:tabular-nums}
.tk-hint{color:var(--muted);font-size:12.5px;flex:1 1 auto}
#tapKeysHide{margin-left:auto}
.tk-keys{position:relative;height:clamp(150px,28vh,240px);user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:none}
.tk{position:absolute;top:0;box-sizing:border-box;cursor:pointer}
.tk.white{height:100%;background:#fbfbfd;border:1px solid #7b8196;border-radius:0 0 8px 8px;display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px;transition:background .45s ease-out}
.tk.black{height:60%;background:#14161f;border:1px solid #05060a;border-radius:0 0 6px 6px;z-index:2;transition:background .45s ease-out}
.tk-name{font:600 13px system-ui,sans-serif;color:#8b90a5;pointer-events:none}
.tk.white.target{background:var(--target-key);box-shadow:inset 0 0 0 3px var(--target)}
.tk.black.target{background:#2f5fcf;box-shadow:inset 0 0 0 2px #93c5fd}
.tk.down{filter:brightness(.88)}
.tk.black.down{filter:brightness(1.6)}
body.mode-game .tk-keys{height:clamp(120px,24vh,200px)}

/* touch screens: finger-sized targets (Apple HIG: 44 pt) */
@media (pointer:coarse){
  .touch-only{display:inline}
  .desk-only{display:none}
  .btn,.seg button,select,.rec-btn,.rec-name input,.panel input[type=number]{min-height:44px}
  .btn{padding:9px 16px}
  .btn.small{min-height:40px;padding:8px 14px;font-size:14px}
  .seg button{padding:8px 14px}
  .switch{min-height:44px}
  .switch .track{width:46px;height:28px}
  .switch .track::after{width:22px;height:22px}
  .switch input:checked + .track::after{transform:translateX(18px)}
  input[type=range]{height:36px}
  .panel .srow label{min-height:44px}
  .panel input[type=radio],.panel input[type=checkbox]{width:22px;height:22px}
  #summary .close-x{min-width:44px;min-height:44px;top:0;right:0}
  #recentTakes summary{padding:10px 0}
}

/* narrow screens (phones, portrait iPad split view) */
@media (max-width:760px){
  header,#recBar,#midiBar,#gameBar,.banner{margin:6px 8px 0;padding:8px 10px;gap:8px}
  header{margin-top:8px}
  main{padding:8px 8px 24px}
  h1{flex-basis:100%;font-size:18px}
  select{max-width:100%;min-width:0}
  #exerciseSelect{flex:1 1 220px}
  .server-status{margin-left:0;flex-basis:100%}
  .rec-name input{width:130px}
  .scorebox{margin-left:0}
  #gameBar .bpm{flex-wrap:wrap}
  #instruction{font-size:18px}
  #laneWrap #summary{left:6px;right:6px;max-width:none}
  .panel{min-width:0;width:calc(100vw - 16px - env(safe-area-inset-left) - env(safe-area-inset-right))}
  .tk-hint{flex-basis:100%;order:5}
  #testInput label{margin-left:0}
}
@media (max-width:560px){
  header .lbl,.rec-name .lbl{display:none}
  header h1{flex-basis:auto;margin-right:auto;order:0}
  header .piano-quick{order:1}
  header #settingsBtn{order:2}
  header .seg{order:3;flex-basis:100%}
  header .seg button{flex:1}
  header #exerciseSelect{order:4;flex:1 1 140px}
  header .loop{order:5}
  header #repeatBtn{order:6}
  .banner{flex-wrap:nowrap;align-items:flex-start}
  .banner .banner-text{flex:1 1 auto}
  #settingsBtn{min-width:48px;font-size:18px}
  #recBar{gap:8px}
  .rec-btn{min-width:110px;padding:8px 16px}
  .rec-name{flex:1 1 90px}
  .rec-name input{width:100%}
  #instruction{font-size:17px}
}
@media (max-width:420px){
  .seg button{padding:8px 10px}
  .btn.big{min-width:0;padding:9px 20px}
  input[type=range]{width:120px}
}
/* phone in landscape: little height, so keep bars tight */
@media (max-height:500px) and (pointer:coarse){
  .tk-keys{height:clamp(120px,48vh,200px)}
  #instruction{font-size:16px;min-height:22px}
  h1{display:none}
}
#settings{padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
.panel{max-height:90vh;max-height:90dvh}
.piano-notice{bottom:calc(18px + env(safe-area-inset-bottom))}
body.tap-keys #tapKeysOpen{display:none}
#midiBannerClose{white-space:nowrap}