:root{
  /* Layout: a songbook on a sunny desk. The map is a path of units; each lesson opens as a book page; a toy piano is docked beneath. */
  --sky:#E2F0F5; --sky-2:#F3F8EE; --paper:#FFFCF3; --paper-edge:#E9DFC6;
  --ink:#2B2A45; --muted:#68658A; --accent:#5B4BDB; --accent-soft:#E7E4FB;
  --ok:#1E9A68; --warn:#D98A00; --bad:#D23B3B; --gold:#E8A700;
  --grass:#86C66A; --grass-dark:#5E9E49; --wood:#2F2C4A;
  --display:"Baloo 2","Trebuchet MS",system-ui,sans-serif;
  --body:"Nunito",system-ui,-apple-system,"Segoe UI",sans-serif;
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{margin:0}
[hidden]{display:none!important}
body{font-family:var(--body);font-size:16px;color:var(--ink);background:linear-gradient(var(--sky),var(--sky-2) 70%);min-height:100vh;display:flex;flex-direction:column}
button,select,input{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
h1,h2,h3{font-family:var(--display);line-height:1.1;margin:0;text-wrap:balance}
.eyebrow{font-size:.75rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.row.center,.center .row{justify-content:center}
.center{text-align:center}
.small{font-size:.88rem;color:var(--muted)}
.msg{font-weight:800;min-height:1.5em;margin:12px 0 0;font-size:1.1rem}

/* ---------- buttons ---------- */
.btn{border:0;border-radius:999px;padding:9px 18px;font-weight:800;background:var(--accent-soft);color:var(--accent);display:inline-flex;align-items:center;gap:6px}
.btn:hover{filter:brightness(.97)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.primary{background:var(--accent);color:#fff}
.btn.big{padding:13px 26px;font-size:1.1rem}
.btn.danger{background:#FCE4E4;color:#B42323}
.btn svg{width:18px;height:18px}

/* ---------- top bar ---------- */
.top{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;padding:12px 20px;max-width:1180px;width:100%;margin:0 auto}
.brand{display:flex;align-items:center;gap:6px;font-family:var(--display);font-weight:800;font-size:1.65rem}
.brand svg{width:42px;height:42px}
.tabs{display:flex;flex-wrap:wrap;gap:4px;background:#ffffffaa;padding:4px;border-radius:999px}
.tab{border:0;background:transparent;padding:7px 15px;border-radius:999px;font-weight:800;color:var(--muted)}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{background:var(--ink);color:#fff}
.ear{margin-left:auto;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.icon-btn{width:40px;height:40px;border-radius:50%;border:0;background:#fff;display:grid;place-items:center;color:var(--accent)}
.icon-btn svg{width:22px;height:22px}
.icon-btn[aria-pressed="false"]{color:#A6A3BD}
.icon-btn[aria-pressed="false"] .waves{opacity:0}
.mic-btn{display:flex;align-items:center;gap:8px;border:0;border-radius:999px;padding:9px 16px;background:var(--accent);color:#fff;font-weight:800}
.mic-btn svg{width:18px;height:18px}
.mic-btn[aria-pressed="true"]{background:var(--ok)}
.hear{display:flex;align-items:center;gap:8px;background:#fff;border-radius:999px;padding:4px 12px 4px 14px}
.hear-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:800}
.hear-note{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:#ECEAF3;font-family:var(--display);font-weight:800;font-size:1.1rem;transition:background .15s}
.level{width:56px;height:8px;border-radius:4px;background:#E7E5F0;overflow:hidden}
.level i{display:block;height:100%;width:0;background:var(--ok);transition:width .08s linear}

.wrap{flex:1;max-width:1100px;width:100%;margin:0 auto;padding:6px 20px 28px}

/* ---------- map ---------- */
.hero{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:18px;background:var(--paper);border-radius:22px;padding:24px 28px;box-shadow:0 2px 0 var(--paper-edge),0 22px 34px -24px #2b2a4566;margin-bottom:22px}
.hero h1{font-size:2.3rem;margin:4px 0 12px}
.meter{height:14px;border-radius:7px;background:#EEEAF8;overflow:hidden}
.meter i{display:block;height:100%;border-radius:7px;background:linear-gradient(90deg,#E5383B,#F3862B,#EDBE1F,#3FA845,#2B97D4,#4A55CF,#9A4FC6);background-size:640px 100%}
.hero-stats{margin:8px 0 0;color:var(--muted);font-weight:700}
.hero-stats b{color:var(--ink);font-variant-numeric:tabular-nums}
.hero-next{display:flex;flex-direction:column;align-items:flex-start;gap:10px;border-left:2px dashed var(--paper-edge);padding-left:20px;min-width:0}
.next-title{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:800;font-size:1.4rem}
.units{display:flex;flex-direction:column;gap:18px}
.unit{background:#ffffffc2;border-radius:20px;padding:18px 20px;border:2px solid #fff;box-shadow:0 1px 0 var(--paper-edge)}
.unit.locked{opacity:.75}
.unit-head{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center;margin-bottom:14px}
.unit-num{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:var(--unit);color:#fff;font-family:var(--display);font-weight:800;font-size:1.5rem}
.unit-head h2{font-size:1.45rem}
.unit-head p{margin:2px 0 0;color:var(--muted);font-weight:700}
.unit-state{font-weight:800;color:var(--muted);font-size:.85rem;white-space:nowrap}
.tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.tile{position:relative;width:100%;height:100%;display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:left;border:2px solid var(--paper-edge);background:var(--paper);border-radius:16px;padding:12px 12px 10px;font-weight:800}
.tile:hover:not(:disabled){border-color:var(--unit);transform:translateY(-1px)}
.tile:disabled{cursor:not-allowed;color:#A6A3BD;background:#F6F4FA;border-color:#ECE9F3}
.tile.next{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.tile-t{line-height:1.2}
.tile-s{font-size:.9rem;letter-spacing:1px;color:var(--gold);margin-top:auto}
.tile:disabled .tile-s{color:#B5B2C8;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase}
.tile-s .off,.big-stars .off{color:#E3DFEE}
.tile-badge{position:absolute;top:-9px;right:10px;background:var(--accent);color:#fff;font-size:.7rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:2px 8px;border-radius:999px}
.tile-ic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:#fff;flex:none}
.tile-ic svg{width:20px;height:20px}
.t-song{background:#5B4BDB}.t-rhythm{background:#E07A2B}.t-quiz{background:#1F95A8}.t-check{background:#E8A700}
.tile:disabled .tile-ic{background:#CFCBE0}

/* ---------- lesson player ---------- */
.player-top{display:flex;align-items:center;gap:16px;margin-bottom:14px;flex-wrap:wrap}
.btn.back{background:#fff;color:var(--ink)}
.lesson-title{font-size:2rem;margin-top:2px}
.page{position:relative;background:var(--paper);border-radius:6px 20px 20px 6px;box-shadow:inset 16px 0 18px -16px #2b2a4533,0 2px 0 var(--paper-edge),0 5px 0 #E2D6B8,0 22px 34px -22px #2b2a4566;padding:22px 30px 26px;min-width:0;min-height:320px}
.stage-song{padding-bottom:0;overflow:hidden}

.intro{display:grid;grid-template-columns:120px minmax(0,1fr);gap:22px;align-items:start;padding:10px 0}
.intro-pip svg{width:120px;height:120px}
.intro-body{display:flex;flex-direction:column;gap:16px;min-width:0}
.intro-text{margin:0;font-size:1.3rem;font-weight:700;line-height:1.5;background:#fff;border:2px solid var(--accent-soft);border-radius:20px 20px 20px 6px;padding:16px 20px;max-width:60ch}
.intro-visual svg{display:block;width:100%;max-width:520px;height:auto}
.intro-visual.wide svg{max-width:none}

/* songs */
.song-bar{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px}
.song-info{display:flex;flex-wrap:wrap;gap:10px;align-items:center;color:var(--muted);font-weight:700}
.song-tools{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.new-notes{display:flex;gap:6px;align-items:center;font-weight:800;color:var(--muted)}
.chip{display:inline-grid;place-items:center;min-width:26px;height:26px;padding:0 6px;border-radius:13px;font-family:var(--display);font-weight:800;color:#fff}
.seg{display:inline-flex;background:var(--accent-soft);border-radius:999px;padding:3px}
.seg button{border:0;background:transparent;border-radius:999px;padding:7px 14px;font-weight:800;color:var(--accent)}
.seg button[aria-pressed="true"]{background:var(--accent);color:#fff}
.seg button.locked{opacity:.5}
.tempo{display:inline-flex;align-items:center;gap:6px;font-weight:800;color:var(--muted);font-variant-numeric:tabular-nums}
.tempo b{color:var(--ink)}
.mini{width:28px;height:28px;border-radius:50%;border:0;background:#fff;font-weight:800;color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft)}
.coach{display:flex;align-items:center;gap:10px;margin:16px 0 4px}
.coach > svg{width:46px;height:46px;flex:none}
.coach p{margin:0;background:#fff;border:2px solid var(--accent-soft);border-radius:16px 16px 16px 4px;padding:9px 14px;font-weight:700;max-width:68ch;min-height:2.6em;display:flex;align-items:center}
.staves{display:flex;flex-direction:column;gap:6px;padding-top:24px}
.countin{position:absolute;left:50%;top:150px;transform:translateX(-50%);z-index:5;width:96px;height:96px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:3.2rem;box-shadow:0 10px 30px #5b4bdb55}
.countin.pulse{animation:pulse .35s ease}
@keyframes pulse{from{transform:translateX(-50%) scale(1.25)}}

/* staff drawing */
svg.staff{display:block;width:100%;height:auto;overflow:visible;scroll-margin:70px 0 230px}
svg.snippet{margin:0 auto}
.staff .sl,.staff .ledger{stroke:#58557A;stroke-width:1.6}
.staff .bar{stroke:#58557A;stroke-width:2}
.staff .bar.heavy{stroke-width:6}
.staff .stem{stroke:var(--ink);stroke-width:2.4}
.staff .clef{font-family:"Noto Music","Segoe UI Symbol","Apple Symbols","Bravura",serif;font-size:118px;fill:var(--ink)}
.staff .tsig{font-family:var(--display);font-weight:800;font-size:34px;fill:var(--ink);text-anchor:middle}
.staff .dyn{font-family:Georgia,"Times New Roman",serif;font-style:italic;font-weight:700;font-size:28px;fill:var(--ink)}
.staff .lyric{font-family:var(--body);font-weight:700;font-size:19px;fill:var(--muted);text-anchor:middle}
.staff .nl{font-family:var(--display);font-weight:800;font-size:15px;text-anchor:middle;pointer-events:none}
.staff .star{font-size:20px;fill:var(--gold);text-anchor:middle;opacity:0;transition:opacity .2s}
.staff .mark{font-size:22px;font-weight:800;text-anchor:middle;font-family:var(--body)}
.staff .ring{fill:none;stroke:var(--accent);stroke-width:3;stroke-dasharray:6 5;opacity:0}
.staff .rest-g{fill:none;stroke:var(--ink);stroke-width:3.4;stroke-linejoin:round;stroke-linecap:round}
.staff .rest-fill{fill:var(--ink)}
.staff .playhead{stroke:var(--accent);stroke-width:3;opacity:.75;stroke-linecap:round;visibility:hidden}
.staff .playhead.on{visibility:visible}
.staff .cnt{font-family:var(--display);font-weight:800;font-size:20px;text-anchor:middle;fill:var(--ink)}
.staff .cnt.held,.staff .cnt.rst{fill:#A6A3BD;font-weight:600}
.staff .cnt.now{fill:var(--accent);font-size:26px}
.nh{opacity:.5;transition:opacity .2s}
.snippet .nh,.perc .nh,.nh.current,.nh.done,.nh.sing,.nh.perfect,.nh.ok,.nh.miss{opacity:1}
.nh.done .star{opacity:1}
.nh.perfect .mark{fill:var(--ok)}.nh.ok .mark{fill:var(--warn)}.nh.miss .mark{fill:var(--bad)}
.nh.miss .head-wrap{opacity:.45}
.nh.current .ring{opacity:1;animation:spin 6s linear infinite;transform-box:fill-box;transform-origin:center}
.nh.sing .head-wrap,.nh.current .head-wrap{animation:breathe 1.4s ease-in-out infinite;transform-box:fill-box;transform-origin:center}
.nh.wobble .head-wrap{animation:wobble .45s ease}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes breathe{50%{transform:scale(1.12)}}
@keyframes wobble{20%{transform:translateX(-6px) rotate(-8deg)}50%{transform:translateX(6px) rotate(8deg)}80%{transform:translateX(-3px)}}

.bird{position:absolute;left:0;top:0;width:50px;height:50px;transition:transform .32s cubic-bezier(.3,1.4,.5,1);pointer-events:none;z-index:3}
.bird svg{width:100%;height:100%}
.bird.hop svg{animation:hop .32s ease}
@keyframes hop{40%{transform:translateY(-14px) rotate(-6deg)}}

.garden{position:relative;display:flex;align-items:flex-end;flex-wrap:wrap;gap:0 2px;min-height:92px;margin:14px -30px 0;padding:0 30px 16px;background:linear-gradient(transparent 62%,var(--grass) 62%,var(--grass-dark))}
.garden .flower{width:30px;height:56px;transform-origin:50% 100%;animation:grow .5s cubic-bezier(.3,1.5,.6,1)}
.garden .flower svg{width:100%;height:100%;display:block}
.garden-empty{position:absolute;left:30px;bottom:24px;color:#ffffffe6;font-weight:800;font-size:.9rem}
@keyframes grow{from{transform:scale(0)}}

.finish{position:absolute;inset:0;background:#fffcf3f0;display:grid;place-items:center;z-index:6;padding:20px;border-radius:inherit}
.finish-card{text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px;max-width:480px}
.big-stars{font-size:3rem;letter-spacing:6px;color:var(--gold);line-height:1}
.finish h3{font-size:2rem}
.finish p{margin:0;font-weight:700;color:var(--muted)}
.finish .finish-note{color:var(--accent)}
.finish .row{justify-content:center;margin-top:6px}

/* rhythm */
.rh-top{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px}
.phase{font-family:var(--display);font-weight:800;font-size:1.5rem}
.beat-lights{display:flex;gap:8px}
.beat-lights span{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:1.2rem;background:#EEEAF8;color:var(--muted);transition:transform .08s,background .08s}
.beat-lights span.on{background:var(--accent);color:#fff;transform:scale(1.15)}
.rh-pad{display:flex;flex-direction:column;align-items:center;gap:8px;margin:18px 0 12px}
.pad{width:150px;height:150px;border-radius:50%;border:6px solid #F3C38E;background:radial-gradient(circle at 50% 40%,#FFF4E2,#F6D7AE);color:#B1561A;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;font-family:var(--display);font-weight:800;font-size:1.3rem;touch-action:manipulation;box-shadow:0 8px 0 #D99A5B}
.pad svg{width:46px;height:46px}
.pad:active{transform:translateY(5px);box-shadow:0 3px 0 #D99A5B}
.pad.oops{animation:wobble .4s ease;border-color:#F0A0A0}
.pad-help{margin:0;color:var(--muted);font-weight:700;text-align:center;max-width:52ch}

/* quiz */
.quiz{display:flex;flex-direction:column;align-items:center;gap:14px}
.qdots{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
.qdots span,.echo-dots span{width:16px;height:16px;border-radius:50%;border:2px solid #CFCBE0}
.qdots .now,.echo-dots .now{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.qdots .good,.echo-dots .good{background:var(--ok);border-color:var(--ok)}
.qdots .helped,.echo-dots .helped{background:#F1C451;border-color:#F1C451}
.qdots .missed{background:#F2B8B8;border-color:#F2B8B8}
.qcard{width:100%;display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center}
.qprompt{font-size:1.9rem}
.qvisual{width:100%;display:flex;flex-direction:column;align-items:center;gap:6px}
.qvisual svg.minikeys{width:100%;max-width:440px;height:auto}
.qvisual svg.snippet{width:100%;height:auto}
.qopts{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.opt{min-width:132px;border:3px solid var(--accent-soft);background:#fff;border-radius:18px;padding:14px 20px;display:flex;flex-direction:column;align-items:center;gap:2px;font-family:var(--display);font-weight:800;font-size:1.35rem;color:var(--ink);transition:transform .08s}
.opt:hover:not(:disabled){border-color:var(--accent);transform:translateY(-2px)}
.opt svg{width:30px;height:30px;color:var(--accent)}
.opt-dyn{font-family:Georgia,"Times New Roman",serif;font-style:italic;font-size:2.2rem;line-height:1}
.opt-s{font-family:var(--body);font-size:.85rem;color:var(--muted);font-weight:800}
.opt.right{border-color:var(--ok);background:#E3F5EC}
.opt.wrong{border-color:#F2B8B8;background:#FDF0F0;opacity:.6}
.qfeedback{margin:0;min-height:1.6em;font-weight:800;font-size:1.15rem;max-width:56ch}
.qfeedback.good{color:var(--ok)}.qfeedback.try{color:#9A5B00}.qfeedback.bad{color:var(--bad)}
.play-hint{margin:0;color:var(--muted);font-weight:700}
.dyn-big{font-family:Georgia,"Times New Roman",serif;font-style:italic;font-weight:700;font-size:6rem;line-height:1}

/* ---------- games ---------- */
.panel{background:var(--paper);border-radius:20px;box-shadow:0 2px 0 var(--paper-edge),0 22px 34px -22px #2b2a4566;padding:24px 28px;min-width:0}
.panel > h2{font-size:2rem}
.panel > .lede{margin:4px 0 0;color:var(--muted);font-weight:700}
.echo-stage{display:flex;align-items:center;justify-content:center;gap:18px;margin:26px 0 10px;flex-wrap:wrap}
.echo-stage .pip-big{width:150px;height:150px}
.echo-stage .pip-big svg{width:100%;height:100%}
.echo-stage .pip-big.sing svg{animation:hop .5s ease 2}
.echo-bubble{position:relative;width:118px;height:118px;border-radius:50%;background:#fff;border:3px solid var(--accent-soft);display:grid;place-items:center}
.echo-bubble::before{content:"";position:absolute;left:-12px;top:60%;border:10px solid transparent;border-right-color:var(--accent-soft)}
.echo-note{width:78px;height:78px;border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:2.4rem;background:#ECEAF3;color:var(--muted);transition:background .25s}
.echo-dots{display:flex;gap:8px;justify-content:center;margin:6px 0 16px}
.arena{position:relative;height:clamp(280px,50vh,420px);margin-top:18px;border-radius:16px;overflow:hidden;background:linear-gradient(#CFE9F6,#EAF6FB 70%,#DDF0D3);box-shadow:inset 0 0 0 2px #ffffff99}
.arena.shake{animation:wobble .4s ease}
.arena-start{position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:20px}
.arena-start p{margin:8px 0 0;font-weight:800;color:var(--muted)}
.bubble{position:absolute;top:0;left:0;width:96px;height:96px;border-radius:50%;background:radial-gradient(circle at 32% 28%,#ffffffee 0 12%,#ffffff66 13% 45%,#ffffff33 46%);border:2px solid #ffffffcc;box-shadow:inset -6px -8px 16px #8fc4e255;display:grid;place-items:center;will-change:transform}
.bubble svg{width:80px;height:62px}
.bubble.pop{animation:pop .3s ease forwards}
@keyframes pop{to{transform:var(--t) scale(1.6);opacity:0}}
.stats{margin-top:10px;font-weight:800;color:var(--muted);gap:18px}
.stats b{color:var(--ink);font-variant-numeric:tabular-nums}

/* ---------- grown-ups ---------- */
.grown{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:18px;margin-top:16px}
.card{background:#fff;border-radius:16px;padding:18px 20px;border:1px solid var(--paper-edge);min-width:0}
.card h3{font-size:1.25rem;margin-bottom:10px}
.card p,.card li{color:#4A4768;line-height:1.5}
.card ul{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:6px}
.mastery,.unit-progress,.settings{display:flex;flex-direction:column;gap:10px}
.m-row{display:grid;grid-template-columns:30px minmax(0,1fr) 46px;gap:10px;align-items:center}
.m-bar{height:10px;border-radius:5px;background:#EEECF5;overflow:hidden}
.m-bar i{display:block;height:100%;border-radius:5px}
.m-sub{font-size:.8rem;color:var(--muted);font-weight:700;margin-top:3px}
.m-pct{text-align:right;font-weight:800;font-variant-numeric:tabular-nums}
.u-row{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:10px;align-items:center;font-weight:700}
.unit-dot{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;color:#fff;font-family:var(--display);font-weight:800}
.u-meta{color:var(--muted);font-size:.85rem;font-variant-numeric:tabular-nums;white-space:nowrap}
.empty{color:var(--muted);font-weight:700}
label.field{display:flex;flex-direction:column;gap:6px;font-weight:800}
label.field select,label.field input{padding:8px 10px;border-radius:10px;border:2px solid var(--accent-soft);background:#fff;font-weight:700}
label.check{display:flex;gap:10px;align-items:center;font-weight:700}
label.check input{width:20px;height:20px;accent-color:var(--accent)}
.confirm{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px;font-weight:800}

/* ---------- piano dock ---------- */
.dock{position:sticky;bottom:0;z-index:10;background:var(--wood);padding:10px 16px calc(12px + env(safe-area-inset-bottom,0px))}
.dock-hint{max-width:640px;margin:0 auto 6px;color:#B9B5D8;font-size:.78rem;font-weight:700;display:flex;justify-content:space-between;gap:4px 10px;flex-wrap:wrap}
.keys{position:relative;display:flex;max-width:640px;margin:0 auto;height:140px;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.key{border:0;padding:0}
.key.white{flex:1;background:linear-gradient(#fff 80%,#F1EEE6);border-right:2px solid var(--wood);border-radius:0 0 10px 10px;display:flex;align-items:flex-end;justify-content:center;padding-bottom:10px;transition:transform .06s}
.key.white:first-child{border-left:2px solid var(--wood)}
.key.black{position:absolute;top:0;width:7.6%;height:60%;background:linear-gradient(#3A3850,#15141F);border-radius:0 0 7px 7px;z-index:2;box-shadow:0 0 0 2px var(--wood)}
.key .dot{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-weight:800;color:#fff;pointer-events:none}
.key.down.white{transform:translateY(3px);background:#ECE8DD}
.key.down.black{background:#55536F}
.key.hint.white{animation:glow 1s ease-in-out infinite}
.key.hint.black{animation:glowb 1s ease-in-out infinite}
@keyframes glow{50%{background:#FFF1A8;box-shadow:inset 0 0 0 4px #F5C800}}
@keyframes glowb{50%{background:#8A7A1E}}

/* ---------- certificate ---------- */
.cert-wrap{position:fixed;inset:0;z-index:30;background:#2b2a45aa;display:grid;place-items:center;padding:16px;overflow:auto}
.cert-card{background:var(--paper);border-radius:18px;padding:18px;max-width:720px;width:100%;box-shadow:0 30px 60px #0005}
.cert-inner{border:3px double var(--gold);outline:6px solid #FFF1C9;outline-offset:-12px;border-radius:12px;padding:34px 30px 26px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px;background:radial-gradient(circle at 50% 0,#FFF6DC,transparent 60%)}
.cert-pip{width:84px;height:84px}
.cert-inner h2{font-size:2.6rem}
.cert-line{margin:0;color:#4A4768;font-weight:700;max-width:52ch;line-height:1.5}
.cert-name{border:0;border-bottom:3px solid var(--ink);background:transparent;text-align:center;font-family:var(--display);font-weight:800;font-size:2rem;width:min(100%,420px);padding:4px}
.cert-foot{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 26px;margin-top:10px;font-weight:800;color:var(--muted)}
.cert-actions{margin-top:14px}

.toast{position:fixed;left:50%;bottom:200px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:12px 18px;border-radius:14px;font-weight:700;max-width:min(92vw,520px);z-index:40;box-shadow:0 10px 30px #0004}

@media (max-width:820px){
  .top{padding-inline:16px;gap:8px 12px}
  .brand{font-size:1.4rem}
  .brand svg{width:34px;height:34px}
  .tabs{order:3;width:100%;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .tab{white-space:nowrap;padding:7px 12px}
  .ear{margin-left:auto}
  .mic-btn .long,.hear-label{display:none}
  .level{width:36px}
  .wrap{padding-inline:16px}
  .hero{grid-template-columns:minmax(0,1fr);padding:20px 18px}
  .hero-next{border-left:0;border-top:2px dashed var(--paper-edge);padding:14px 0 0}
  .hero h1{font-size:1.8rem}
  .unit{padding:16px 14px}
  .unit-head{grid-template-columns:auto minmax(0,1fr)}
  .unit-state{grid-column:2}
  .tiles{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}
  .page{padding:18px 16px 22px}
  .garden{margin-inline:-16px;padding-inline:16px}
  .garden-empty{left:16px}
  .lesson-title{font-size:1.5rem}
  .intro{grid-template-columns:minmax(0,1fr)}
  .intro-pip svg{width:80px;height:80px}
  .intro-text{font-size:1.1rem}
  .panel{padding:18px 16px}
  .qprompt{font-size:1.45rem}
  .opt{min-width:110px;padding:12px 14px}
  .keys{height:118px}
  .key .dot{width:24px;height:24px;font-size:.85rem}
  .toast{bottom:170px}
  .cert-inner{padding:24px 14px}
  .cert-inner h2{font-size:2rem}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
@media print{
  body{background:#fff}
  body > *:not(.cert-wrap){display:none!important}
  .cert-wrap{position:static;background:none;padding:0}
  .cert-card{box-shadow:none;max-width:none}
  .cert-actions{display:none}
}