:root{
  --bg:#f6f1e6; --panel:#fffdf6; --panel2:#efe8d8; --ink:#232019; --muted:#6d6455;
  --line:#d8cfba; --gold:#c08a12; --gold-soft:#f6e6b8; --accent:#35507a;
  --good:#2e8b57; --good-bg:#dff0e4; --bad:#c0392b; --bad-bg:#f6ddd8;
  --warn:#9a6a00; --warn-bg:#fbefcf; --shadow:0 2px 14px rgba(60,45,20,.10);
  --rh:#3a6ea5; --lh:#c8742a; --note:#232019; --staff:#8b8270;
  --blue:#1f74d1; --blue-bg:#dcebfb; --yellow:#d49a00; --yellow-bg:#fbf0c9; --heard:#9a9a9a;
  --sans:"Segoe UI",system-ui,-apple-system,Arial,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#14161d; --panel:#1d2029; --panel2:#252936; --ink:#e8e2d2; --muted:#9a937f;
    --line:#333849; --gold:#e0b04a; --gold-soft:#4a3d1c; --accent:#7a9cd0;
    --good:#5cc489; --good-bg:#1e3a29; --bad:#ec6a57; --bad-bg:#3d2320;
    --warn:#e2b54a; --warn-bg:#3b3118; --shadow:0 2px 14px rgba(0,0,0,.4);
    --rh:#5f95d0; --lh:#d98a44; --note:#ece6d6; --staff:#7d7867;
    --blue:#5aa2f0; --blue-bg:#1b2d44; --yellow:#f0c445; --yellow-bg:#3b3118; --heard:#8a8a8a;
  }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--sans);max-width:100%;overflow-x:hidden}
body{min-height:100vh;display:flex;flex-direction:column;-webkit-text-size-adjust:100%}
button{font:inherit;color:inherit;cursor:pointer}
[hidden]{display:none!important}
input,select,textarea,.pf-search{font-size:16px!important}
header.top{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:12px 20px;border-bottom:1px solid var(--line);background:var(--panel)}
.homelink{font-size:13.5px;font-weight:600;color:var(--muted);text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:6px 13px;white-space:nowrap}
.homelink:hover{color:var(--gold);border-color:var(--gold)}
.brand{font-family:Georgia,serif;font-size:22px;font-weight:700;margin-right:auto}
.brand small{display:block;font-family:var(--sans);font-size:12px;font-weight:500;color:var(--muted)}
.chip{border:1px solid var(--line);background:var(--panel2);border-radius:999px;padding:7px 14px;font-size:14px;font-weight:600;min-height:40px}
.chip:hover{border-color:var(--gold)}
main{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:20px 20px 40px;min-width:0}
h1,h2,h3{font-family:Georgia,serif}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:16px 20px;margin-bottom:14px}
.small{font-size:13.5px;color:var(--muted);line-height:1.5;margin:8px 0 0}
.btn{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:9px 15px;font-weight:600;min-height:44px}
.btn:hover{border-color:var(--gold)}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn.go{background:var(--good);color:#fff;border-color:var(--good)}
.btn.stop{background:var(--bad);color:#fff;border-color:var(--bad)}
.btn:disabled{opacity:.5;cursor:default}
select{font:inherit;padding:6px 8px;border-radius:8px;border:1px solid var(--line);background:var(--panel2);color:var(--ink);min-height:40px;max-width:100%}
/* today */
.today-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.today-head h2{margin:0;font-size:22px}
.goalbar{height:14px;border-radius:999px;background:var(--panel2);margin:12px 0 6px;overflow:hidden;border:1px solid var(--line)}
.goalbar>div{height:100%;width:0;background:linear-gradient(90deg,var(--good),#5aa77a);transition:width .4s}
.goaltext{margin:0;font-size:16px;font-weight:600}.goaltext.hit{color:var(--good)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.stats div{background:var(--panel2);border-radius:12px;padding:10px;text-align:center}
.stats b{display:block;font-size:24px}
.stats span{font-size:12.5px;color:var(--muted)}
.setup-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.lbl{font-weight:700}
.setup-row select{flex:1;min-width:0}
.setup-btns{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
/* tabs & lessons */
.tabs{display:flex;gap:8px;margin:20px 0 8px;flex-wrap:wrap}
.tab{border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:8px 14px;font-weight:600;min-height:42px;font-size:14.5px}
.tab small{display:block;font-size:11px;font-weight:500;color:var(--muted)}
.tab[aria-selected="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.tab[aria-selected="true"] small{color:var(--bg);opacity:.75}
.tab.rec{box-shadow:0 0 0 3px var(--gold-soft)}
.blurb{color:var(--muted);margin:6px 2px 12px;font-size:15px}
.lessons{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.lcard{text-align:left;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:12px 14px;min-height:82px;display:flex;flex-direction:column;gap:4px}
.lcard:hover{border-color:var(--gold);box-shadow:var(--shadow)}
.lcard b{font-size:15.5px}
.lcard .meta{font-size:12.5px;color:var(--muted)}
.lcard .stars{color:var(--gold);letter-spacing:2px;font-size:15px}
.lcard.done{border-left:5px solid var(--good)}
.note{font-size:13.5px;color:var(--muted);line-height:1.5;margin-top:22px}
/* lesson */
.lesson-top{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.ltitle{margin-right:auto;min-width:0}
.ltitle h2{margin:0;font-size:21px}
.ltitle span{font-size:13px;color:var(--muted)}
.bar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:12px 0 6px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--panel)}
.seg button{border:none;background:none;padding:9px 13px;font-weight:600;min-height:42px;font-size:14.5px}
.seg button+button{border-left:1px solid var(--line)}
.seg button[aria-checked="true"]{background:var(--ink);color:var(--bg)}
.morebox{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;background:var(--panel2);border-radius:12px;padding:10px 14px;margin:6px 0;font-size:14.5px}
.opt{display:inline-flex;align-items:center;gap:6px}
.opt input[type=checkbox]{width:20px;height:20px}
.opt input[type=range]{width:130px}
.statusbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:8px 0}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--bad-bg);color:var(--bad);font-weight:700;border-radius:999px;padding:6px 12px;font-size:14px}
.pill::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--bad);animation:pulse 1.2s infinite}
@keyframes pulse{50%{opacity:.35}}
.meter{width:80px;height:10px;border-radius:999px;background:var(--panel);border:1px solid var(--line);overflow:hidden}
.meter>div{height:100%;width:0;background:var(--good);transition:width .08s}
.feedback{font-size:18px;font-weight:700;min-height:26px}
.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.feedback.warn{color:var(--warn)}
.count{margin-left:auto;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.msg{margin:6px 0 10px;padding:10px 14px;border-radius:12px;background:var(--warn-bg);font-size:14.5px;line-height:1.45}
.tip{margin:4px 0 10px;padding:10px 14px;border-radius:12px;background:var(--panel2);font-size:14.5px;line-height:1.45;border-left:4px solid var(--gold)}
.stagewrap{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);min-height:260px}
.sheet{overflow-y:auto;overflow-x:hidden;max-height:min(62vh,640px);padding:6px 0;scroll-behavior:smooth}
.fall{display:block;width:100%;height:min(52vh,460px);border-radius:16px 16px 0 0}
.countin{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:96px;font-weight:800;color:var(--gold);pointer-events:none;font-family:Georgia,serif}
.kbwrap{margin-top:8px;background:var(--panel2);border-radius:12px;padding:6px;border:1px solid var(--line)}
/* home: next lesson + path */
.nextcard{display:grid;grid-template-columns:1fr auto;grid-template-areas:"k go" "t go" "s go";align-items:center;width:100%;text-align:left;border:2px solid var(--blue);background:var(--blue-bg);cursor:pointer}
.nextcard .nk{grid-area:k;font-size:12.5px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--blue)}
.nextcard b{grid-area:t;font:700 22px Georgia,serif;margin:2px 0}
.nextcard .nsub{grid-area:s;font-size:14px;color:var(--muted)}
.nextcard .ngo{grid-area:go;width:58px;height:58px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px}
.path{position:relative;display:flex;flex-direction:column;gap:6px;padding:6px 0 10px}
.path::before{content:"";position:absolute;left:50%;top:18px;bottom:18px;border-left:4px dotted var(--line);transform:translateX(-2px)}
.pnode{position:relative;display:flex;align-items:center;gap:12px;width:calc(50% + 28px);border:none;background:none;padding:4px 0;text-align:left}
.pnode.l{flex-direction:row-reverse;text-align:right;align-self:flex-start}
.pnode.r{align-self:flex-end}
.pnode .pdot{flex:none;width:56px;height:56px;border-radius:50%;background:var(--panel);border:3px solid var(--line);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;box-shadow:var(--shadow);z-index:1}
.pnode .ptxt{display:flex;flex-direction:column;gap:2px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:9px 12px;min-width:0;flex:1}
.pnode .ptxt b{font-size:15.5px}
.pnode .meta{font-size:12px;color:var(--muted)}
.pnode .stars{color:var(--gold);font-size:13.5px;letter-spacing:1px}
.pnode.done .pdot{background:var(--gold);border-color:var(--gold);color:#fff}
.pnode.going .pdot{border-color:var(--blue);color:var(--blue)}
.pnode.next .pdot{background:var(--blue);border-color:var(--blue);color:#fff;animation:bob 1.6s ease-in-out infinite}
.pnode.next .ptxt{border-color:var(--blue)}
.pnode:hover .ptxt{border-color:var(--gold)}
@keyframes bob{50%{transform:translateY(-4px)}}
/* lesson: the play screen */
.ptop{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.iconbtn{width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:var(--panel);font-weight:800;font-size:15px;flex:none}
.iconbtn:hover{border-color:var(--gold)}
.pinfo{display:flex;flex-direction:column;min-width:0;flex:1}
.pinfo b{font:700 19px Georgia,serif;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pinfo span{font-size:13px;color:var(--muted)}
.pdots{display:flex;gap:5px;flex-wrap:wrap}
.pdots .dot{min-width:32px;height:30px;border-radius:999px;border:1px solid var(--line);background:var(--panel);font-size:12px;font-weight:700;color:var(--muted);padding:0 7px}
.pdots .dot.mv{border-style:dashed}
.pdots .dot.done{background:var(--gold-soft);color:var(--ink);border-color:var(--gold)}
.pdots .dot.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
#stage.stagewrap{overflow:hidden;min-height:0;height:calc(var(--lane-h,240px) + 16px)}
.lane{position:absolute;inset:8px 0;overflow:hidden}
.lanein{position:absolute;left:0;top:0;will-change:transform}
.lane .lanebg{position:absolute;left:0;top:0}
.headfix{position:absolute;left:0;top:8px;z-index:2;box-shadow:6px 0 10px -8px rgba(0,0,0,.35)}
.playhead{position:absolute;top:0;bottom:0;width:4px;margin-left:-2px;border-radius:2px;background:linear-gradient(var(--blue),rgba(31,116,209,.25));z-index:3;pointer-events:none;box-shadow:0 0 12px rgba(31,116,209,.45)}
#stage .fall{height:100%}
.banner{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:5;background:var(--ink);color:var(--bg);font-weight:800;font-size:20px;padding:12px 20px;border-radius:14px;box-shadow:var(--shadow);text-align:center;max-width:90%}
.intro{margin:0 0 8px}
.rotate{display:none;margin:0 0 8px;font-size:13.5px;color:var(--muted)}
@media (max-width:600px) and (orientation:portrait){.rotate{display:block}}
.introcard{background:var(--panel);border:2px solid var(--blue);border-radius:16px;box-shadow:var(--shadow);padding:10px 16px;max-width:640px;width:100%}
.introcard p{margin:4px 0;font-size:14.5px;line-height:1.45}
.introcard{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px}
.introcard p{flex:1;min-width:220px}
.introtag{font-weight:800;color:var(--blue);font-size:14px}
.introcard .controls{justify-content:flex-end;margin:4px 0 0}
.pbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:10px 0 6px}
.speedtag{font-weight:800;color:var(--accent);background:var(--panel2);border-radius:999px;padding:6px 12px;font-size:14px}
.pmrow{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.panelcard h3{font-size:15px;margin:16px 0 6px;color:var(--muted);font-family:var(--sans);text-transform:uppercase;letter-spacing:.06em}
.pmparts{display:flex;flex-direction:column;gap:6px;max-height:34vh;overflow:auto}
.pmparts .part{display:flex;justify-content:space-between;gap:10px;margin:0;font-size:14px;min-height:42px}
.pmparts .part.on{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.pmparts .stars{color:var(--gold);white-space:nowrap}
.pmopts{display:flex;flex-direction:column;gap:10px;font-size:14.5px}
.pmopts .opt{justify-content:space-between}
.pmopts .opt:has(input[type=checkbox]){justify-content:flex-start}
.pmopts select{max-width:62%}
#panelBody svg.score{max-width:100%;height:auto}
/* score */
svg.score{display:block}
svg.score .sl{stroke:var(--staff);stroke-width:1}
svg.score .bl{stroke:var(--staff);stroke-width:1.3}
svg.score .bl.end{stroke-width:3.5}
svg.score .ledger{stroke:var(--note);stroke-width:1.3}
svg.score use{fill:var(--note)}
svg.score .stem{stroke:var(--note);stroke-width:1.3}
svg.score .beam{fill:var(--note)}
svg.score .tie{fill:none;stroke:var(--note);stroke-width:1.2}
svg.score .braceg{fill:var(--note)}
svg.score .dot{fill:var(--note)}
svg.score .mnum{fill:var(--muted);font-size:11px}
svg.score .let{font:700 9.5px var(--sans);text-anchor:middle;fill:var(--note);pointer-events:none}
svg.score .let.on{fill:var(--panel)}
svg.score .fing{font:600 11px var(--sans);text-anchor:middle;fill:var(--accent)}
svg.score .lyr{font:500 13px Georgia,serif;font-size:clamp(10.5px,2.9vw,13px);text-anchor:middle;fill:var(--ink)}
svg.score .hl{fill:transparent}
svg.score .st.cur .hl{fill:var(--gold-soft)}
svg.score .nt.other{opacity:.32}
svg.score .hd.ok use,svg.score .st.ok .nt:not(.other) use,svg.score .st.ok .nt:not(.other) .stem,svg.score .st.ok .nt:not(.other) .ledger,svg.score .st.ok .nt:not(.other) .beam{fill:var(--blue);stroke:var(--blue)}
svg.score .hd.ok use{fill:var(--blue)}
svg.score .hd.ok2 use,svg.score .st.ok2 .nt:not(.other) use,svg.score .st.ok2 .nt:not(.other) .stem,svg.score .st.ok2 .nt:not(.other) .ledger{fill:var(--yellow);stroke:var(--yellow)}
svg.score .st.out{opacity:.28}
svg.score.head .headbg{fill:var(--panel)}
svg.score .mark{font:800 18px var(--sans);text-anchor:middle;fill:var(--bad)}
svg.score .splash{fill:none;stroke:var(--blue);stroke-width:3;animation:splash .7s ease-out forwards;pointer-events:none}
svg.score .splash.late{stroke:var(--yellow)}
svg.score .splash.bad{stroke:var(--bad)}
@keyframes splash{from{opacity:1;r:4}to{opacity:0;r:34}}
/* keyboard */
svg.kb{display:block;width:100%;height:clamp(84px,15vw,150px);touch-action:manipulation;user-select:none;-webkit-user-select:none}
svg.kb .white rect{fill:#fffefa;stroke:#b9b09c;stroke-width:.4}
svg.kb .black rect{fill:#1d1b18;stroke:#000;stroke-width:.3}
svg.kb .kl{font:600 4.3px var(--sans);text-anchor:middle;fill:#9a917e;display:none}
svg.kb .kl.mc{display:block;fill:#6d6455}
svg.kb.letters .kl{display:block}
svg.kb .kf{font:800 5.2px var(--sans);text-anchor:middle;fill:#fff}
svg.kb .white .kf{fill:#5a3b00}
svg.kb .next.white rect{fill:#f6d77a}
svg.kb .next.black rect{fill:#b8860b}
svg.kb .lit.white rect{fill:#9ccaf5}
svg.kb .lit.black rect{fill:#2f6fa8}
svg.kb .good.white rect,svg.kb .good.black rect{fill:#4d9be8}
svg.kb .heard.white rect,svg.kb .heard.black rect{fill:#a3a3a3}
svg.kb .bad.white rect,svg.kb .bad.black rect{fill:#e2604f}
svg.kb .down rect{filter:brightness(.88)}
/* done */
.donecard{text-align:center}
.bigstars{font-size:54px;color:var(--gold);letter-spacing:6px;margin:6px 0}
.donestats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:18px 0}
.donestats div{background:var(--panel2);border-radius:12px;padding:10px}
.donestats b{display:block;font-size:22px}
.donestats span{font-size:12.5px;color:var(--muted)}
.controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:14px 0 4px}
/* free play */
.freecard{text-align:center}
.bignote{font:700 clamp(54px,12vw,110px) Georgia,serif;line-height:1.1;min-height:1.1em}
.bignote.pop{animation:pop .35s ease-out}
@keyframes pop{0%{transform:scale(.7);opacity:.3}60%{transform:scale(1.08)}100%{transform:scale(1)}}
.chordname{font-size:20px;font-weight:700;color:var(--accent);min-height:28px}
.freesheet{display:flex;justify-content:center;margin:6px 0}
.trail{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;min-height:34px}
.trail span{background:var(--panel2);border-radius:999px;padding:4px 10px;font-weight:700;font-size:14px}
/* panel */
.panel{position:fixed;inset:0;background:rgba(20,16,10,.55);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.panelcard{background:var(--panel);border-radius:18px;max-width:560px;width:100%;padding:20px 22px;box-shadow:0 10px 40px rgba(0,0,0,.3);max-height:92vh;overflow:auto}
.panelcard h2{margin:0 0 10px}
.bigstep{font-size:20px;font-weight:700;margin:10px 0}
.okline{color:var(--good);font-weight:700}
.badline{color:var(--bad);font-weight:700}
.choice{display:block;width:100%;text-align:left;margin:8px 0}
footer{border-top:1px solid var(--line);padding:18px 20px 26px;font-size:12.5px;color:var(--muted);text-align:center;line-height:1.6}
footer a{color:var(--muted)}
@media (max-width:640px){
  .pdots{width:100%}
  .pmrow{grid-template-columns:1fr}
  .pnode{width:calc(50% + 24px)}
  .pnode .pdot{width:46px;height:46px;font-size:16px}
  .pnode .ptxt b{font-size:14px}
  header.top{padding:10px 14px;gap:8px}
  .brand{font-size:19px;width:100%;order:-1}
  main{padding:14px 12px 30px}
  .lessons{grid-template-columns:1fr 1fr}
  .donestats{grid-template-columns:repeat(2,1fr)}
  .seg button{padding:8px 10px;font-size:13.5px}
  .count{margin-left:0}
  .sheet{max-height:52vh}
}
@media (max-height:500px) and (orientation:landscape){
  body[data-screen="lesson"] header.top,body[data-screen="lesson"] footer{display:none}
  body[data-screen="lesson"] main{padding:6px 12px 10px}
  .ptop{margin-bottom:4px}
  .pinfo b{font-size:16px}
  .pbar{margin:6px 0 4px}
  .pbar .btn{min-height:40px;padding:6px 12px}
  svg.kb{height:clamp(60px,18vh,100px)}
  .tip{display:none}
  .introtag{display:none}
  .introcard{padding:6px 12px}
  .introcard p{font-size:13px;margin:0}
}
@media (prefers-reduced-motion: reduce){ .pill::before,.bignote.pop,svg.score .splash,.pnode.next .pdot{animation:none} }