:root{
  --paper:#F5F8FC; --grid:#DCE6F2; --card:#FFFFFF; --ink:#1C2846; --muted:#5B6884; --line:#C9D5E6; --soft:#EEF3F9;
  --brand:#1E2452; --brand-ink:#FFFFFF; --accent:#F26A1B; --accent-ink:#FFFFFF;
  --good:#1F8A4C; --good-bg:#E3F4EA; --bad:#C2413A; --bad-bg:#FBE5E3; --warn:#9A6400; --warn-bg:#FBF0DB; --info:#0F7C8A; --info-bg:#DDF2F4;
  --star:#F2B01B; --sub:#F26A1B;
  --math:#F26A1B; --reading:#2F6FDC; --science:#1F9D55; --music:#B5179E; --typing:#6C5CE7; --coding:#0F8A8A;
  --display:"Baloo 2","Trebuchet MS",system-ui,sans-serif;
  --body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){:root{
  --paper:#121826; --grid:#1B2437; --card:#1A2234; --ink:#E9EEF7; --muted:#A1ACC4; --line:#33405A; --soft:#202A3F;
  --brand:#0C1022; --accent:#FF8A3D; --accent-ink:#1A1006;
  --good:#4CC27F; --good-bg:#183326; --bad:#F07A72; --bad-bg:#3A1D1C; --warn:#E8B04E; --warn-bg:#3A2E15; --info:#5CC8D4; --info-bg:#163238;
  --star:#F5C14A;
  --math:#FF8A3D; --reading:#6AA0FF; --science:#4CC27F; --music:#E05BC9; --typing:#A29BFE; --coding:#4CC7C0; color-scheme:dark}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:18px;line-height:1.5;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:28px 28px;min-height:100vh}
h1,h2,h3{font-family:var(--display);line-height:1.1;margin:0;text-wrap:balance}
p{margin:0}
a{color:inherit}
button{font:inherit;color:inherit;cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--info);outline-offset:2px}
.wrap{max-width:960px;margin:0 auto;padding:20px 16px 72px}
.muted{color:var(--muted)}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.card{background:var(--card);border:2px solid var(--line);border-radius:18px;padding:20px}

/* header + tabs */
.site-head{background:var(--brand);color:var(--brand-ink);position:sticky;top:0;z-index:20}
.site-head .inner{max-width:960px;margin:0 auto;padding:10px 16px 0;display:flex;flex-direction:column;gap:6px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;font-family:var(--display);font-weight:800;font-size:1.45rem;line-height:1}
.brand svg{flex:none}
.tabs{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;margin:0 -16px;padding:0 16px}
.tabs::-webkit-scrollbar{display:none}
.tab{flex:none;text-decoration:none;color:#C9D0EE;font-family:var(--display);font-weight:700;font-size:1.05rem;padding:8px 14px 10px;border-radius:12px 12px 0 0;border-bottom:4px solid transparent;white-space:nowrap}
.tab:hover{color:#fff}
.tab.on{color:#fff;border-bottom-color:var(--tc,#fff);background:rgba(255,255,255,.08)}

.btn{border:2px solid var(--line);background:var(--card);border-radius:14px;padding:11px 20px;font-family:var(--display);font-weight:700;font-size:1.12rem;line-height:1.2;text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.btn:hover:not(:disabled){border-color:var(--sub)}
.btn.primary{background:var(--sub);border-color:var(--sub);color:#fff}
.btn.small{padding:6px 12px;font-size:.95rem}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* home */
.hero{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:center;margin:8px 0 26px}
.hero h1{font-size:clamp(2.4rem,8vw,3.6rem);font-weight:800}
.hero p{font-size:1.15rem;color:var(--muted);margin-top:8px;max-width:52ch}
.subjects{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.subj{display:flex;gap:14px;align-items:center;text-decoration:none;color:var(--ink);background:var(--card);border:2px solid var(--line);border-radius:18px;padding:16px;transition:transform .12s,box-shadow .12s}
.subj:hover,.subj:focus-visible{transform:translateY(-3px);box-shadow:0 6px 0 var(--line);outline:none}
.subj .ic{width:62px;height:62px;border-radius:16px;display:grid;place-items:center;flex:none;background:color-mix(in srgb,var(--sc) 16%,var(--card));color:var(--sc)}
.subj b{font-family:var(--display);font-size:1.5rem;line-height:1.1;display:block}
.subj span{color:var(--muted);font-size:.95rem}
.subj .count{font-size:.85rem;font-weight:700;color:var(--sc)}
.note-box{margin-top:32px;background:var(--card);border:2px dashed var(--line);border-radius:18px;padding:18px 20px}
.note-box h2{font-size:1.4rem;margin-bottom:6px}
.note-box ul{margin:6px 0 0;padding-left:20px}

/* subject page */
.subj-head{display:flex;gap:16px;align-items:center;margin:6px 0 20px}
.subj-head .ic{width:72px;height:72px;border-radius:18px;display:grid;place-items:center;flex:none;background:color-mix(in srgb,var(--sub) 16%,var(--card));color:var(--sub)}
.subj-head h1{font-size:clamp(2.2rem,7vw,3rem);font-weight:800}
.lessons{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
.lesson-card{display:flex;flex-direction:column;gap:6px;text-decoration:none;color:var(--ink);background:var(--card);border:2px solid var(--line);border-top:7px solid var(--sub);border-radius:18px;padding:16px 18px;transition:transform .12s,box-shadow .12s}
.lesson-card:hover,.lesson-card:focus-visible{transform:translateY(-3px);box-shadow:0 6px 0 var(--line);outline:none}
.lesson-card .n{font-family:var(--display);font-weight:700;color:var(--sub);font-size:.9rem;letter-spacing:.04em;text-transform:uppercase}
.lesson-card b{font-family:var(--display);font-size:1.35rem;line-height:1.15}
.lesson-card .goal{color:var(--muted);font-size:.95rem}
.stars{color:var(--star);letter-spacing:.12em;font-size:1.15rem}
.stars .off{color:var(--line)}

/* player */
.player{max-width:760px;margin:0 auto}
.ptop{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.pbar{flex:1;height:14px;border-radius:99px;background:var(--card);border:2px solid var(--line);overflow:hidden}
.pbar i{display:block;height:100%;background:var(--sub);transition:width .3s}
.pcount{font-family:var(--display);font-weight:700;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.qcard{background:var(--card);border:2px solid var(--line);border-radius:20px;padding:22px;display:flex;flex-direction:column;gap:18px}
.q{display:flex;gap:12px;align-items:flex-start}
.q .qt{font-family:var(--display);font-weight:600;font-size:1.45rem;line-height:1.3;text-wrap:pretty}
.q .qt.learn-title{font-weight:800;font-size:1.8rem}
.speak{flex:none;width:44px;height:44px;border-radius:50%;border:2px solid var(--line);background:var(--card);font-size:1.15rem;padding:0;display:grid;place-items:center}
.learn-text{font-size:1.2rem;line-height:1.55;max-width:62ch}
.learn-text p+p{margin-top:10px}
.visual{display:flex;justify-content:center;overflow-x:auto}
.visual svg{max-width:100%;height:auto}
.listen{align-self:center}
.kw{background:color-mix(in srgb,var(--sub) 18%,transparent);border-radius:6px;padding:0 4px;font-weight:700}

.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.choices.one{grid-template-columns:1fr}
.choice{border:3px solid var(--line);background:var(--card);border-radius:16px;padding:14px;min-height:64px;font-family:var(--display);font-size:1.3rem;font-weight:600;display:flex;align-items:center;justify-content:center;text-align:center;line-height:1.25}
.choice:hover:not(:disabled){border-color:var(--sub)}
.choice svg{max-width:100%;height:auto}
.choice.right{border-color:var(--good);background:var(--good-bg)}
.choice.wrong{border-color:var(--bad);background:var(--bad-bg);opacity:.7}

.numwrap{display:flex;flex-direction:column;align-items:center;gap:12px}
.numdisp{min-width:170px;min-height:66px;border:3px solid var(--sub);border-radius:16px;background:var(--card);font-family:var(--display);font-size:2.3rem;font-weight:700;display:flex;align-items:center;justify-content:center;gap:8px;padding:0 18px;font-variant-numeric:tabular-nums}
.numdisp .unit{font-size:1.2rem;color:var(--muted)}
.numdisp .ph{color:var(--line)}
.pad{display:grid;grid-template-columns:repeat(3,70px);gap:9px}
.pkey{height:58px;border:2px solid var(--line);border-radius:14px;background:var(--card);font-family:var(--display);font-size:1.55rem;font-weight:700}
.pkey.go{background:var(--sub);color:#fff;border-color:var(--sub)}

.pool{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;min-height:56px;padding:10px;border-radius:14px;background:var(--soft)}
.chip{border:3px solid var(--line);background:var(--card);border-radius:14px;padding:10px 16px;font-family:var(--display);font-size:1.2rem;font-weight:600;line-height:1.2;display:inline-flex;align-items:center;gap:8px}
.chip.sel{border-color:var(--sub);box-shadow:0 0 0 4px color-mix(in srgb,var(--sub) 30%,transparent);transform:translateY(-2px)}
.chip.placed{cursor:default;border-color:var(--good);background:var(--good-bg);font-size:1.05rem;padding:6px 12px}
.bins{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.bin{border:3px dashed var(--line);border-radius:16px;padding:12px;min-height:120px;background:var(--card);display:flex;flex-direction:column;gap:8px;align-items:stretch;text-align:left}
.bin h3{font-size:1.25rem;text-align:center}
.bin .in{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.bin.ready{border-color:var(--sub);border-style:solid}
.slots{display:flex;flex-direction:column;gap:8px}
.slot{display:flex;gap:10px;align-items:center;min-height:52px;border:2px dashed var(--line);border-radius:14px;padding:6px 12px;background:var(--card)}
.slot b{font-family:var(--display);color:var(--sub);font-size:1.3rem;width:1.4em;flex:none}
.slot.filled{border-style:solid;border-color:var(--good);background:var(--good-bg)}
.match{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.match .col{display:flex;flex-direction:column;gap:10px}
.match .chip{justify-content:center;min-height:58px}
.match .chip.done{border-color:var(--good);background:var(--good-bg);cursor:default}

.fb{border-radius:14px;padding:14px 16px;font-size:1.12rem;line-height:1.45}
.fb.good{background:var(--good-bg);border:2px solid var(--good)}
.fb.bad{background:var(--bad-bg);border:2px solid var(--bad)}
.fb.info{background:var(--info-bg);border:2px solid var(--info)}
.fb b{font-family:var(--display)}
.next-row{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}
.shake{animation:shake .35s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

/* typing */
.typebox{font-family:var(--mono);font-size:1.9rem;line-height:1.5;letter-spacing:.04em;background:var(--soft);border-radius:14px;padding:14px 18px;word-break:break-word;text-align:center}
.typebox .done{color:var(--good)}
.typebox .cur{background:var(--sub);color:#fff;border-radius:6px}
.typebox .cur.sp{background:color-mix(in srgb,var(--sub) 45%,transparent)}
.typebox .todo{color:var(--muted)}
.typebox .err{background:var(--bad);color:#fff;border-radius:6px}
.tstats{display:flex;gap:18px;justify-content:center;font-family:var(--display);font-weight:700;color:var(--muted)}
.kb{display:flex;flex-direction:column;gap:5px;align-items:center;user-select:none}
.kr{display:flex;gap:4px}
.k{width:clamp(24px,calc((100vw - 110px) / 10),48px);height:clamp(30px,calc((100vw - 90px) / 10),48px);border-radius:8px;border:2px solid var(--line);background:var(--card);display:grid;place-items:center;font-family:var(--mono);font-weight:700;font-size:clamp(.8rem,3vw,1.05rem);position:relative}
.k.home{border-bottom-width:5px}
.k.space{width:clamp(150px,45vw,260px)}
.k.shift{width:clamp(56px,16vw,90px);font-size:.8rem}
.k.next{background:var(--fc,var(--sub));color:#fff;border-color:var(--fc,var(--sub));transform:translateY(-2px)}
.k.miss{background:var(--bad);color:#fff}
.k[data-f="lp"],.k[data-f="rp"]{--fc:#D6409F}.k[data-f="lr"],.k[data-f="rr"]{--fc:#D97706}.k[data-f="lm"],.k[data-f="rm"]{--fc:#1F9D55}.k[data-f="li"],.k[data-f="ri"]{--fc:#2F6FDC}.k[data-f="th"]{--fc:#6C5CE7}
.fingers{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;font-size:.85rem;color:var(--muted)}
.fingers i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:4px;vertical-align:-1px}
.hidden-input{position:absolute;opacity:0;width:1px;height:1px;left:-9999px}

/* piano */
.piano{position:relative;display:flex;justify-content:center;user-select:none;touch-action:manipulation;margin:0 auto}
.wk{width:clamp(34px,9vw,58px);height:clamp(140px,40vw,200px);border:2px solid var(--ink);border-radius:0 0 10px 10px;background:#fff;color:#1C2846;margin-left:-2px;display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px;font-family:var(--display);font-weight:800;font-size:1.05rem;position:relative;z-index:1}
.bk{position:absolute;width:clamp(22px,5.6vw,36px);height:clamp(88px,25vw,124px);background:#1C2846;border:2px solid #1C2846;border-radius:0 0 7px 7px;z-index:2;color:#fff;font-size:.7rem;display:flex;align-items:flex-end;justify-content:center;padding-bottom:4px}
.wk.hit,.bk.hit{background:var(--sub);color:#fff}
.wk.glow{background:color-mix(in srgb,var(--star) 55%,#fff)}
.bk.glow{background:#B38200}
.wk.ok{background:var(--good-bg)} .wk.no,.bk.no{background:var(--bad)!important;color:#fff}
.drum{width:180px;height:180px;border-radius:50%;border:6px solid var(--ink);background:radial-gradient(circle at 50% 40%,color-mix(in srgb,var(--sub) 60%,#fff),var(--sub));font-family:var(--display);font-weight:800;font-size:1.6rem;color:#fff;align-self:center;touch-action:manipulation}
.drum:active,.drum.hit{transform:scale(.95)}
.beats{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.beats i{width:22px;height:22px;border-radius:50%;border:3px solid var(--line);display:block}
.beats i.now{border-color:var(--sub);background:color-mix(in srgb,var(--sub) 30%,transparent)}
.beats i.ok{background:var(--good);border-color:var(--good)}
.beats i.miss{background:var(--bad);border-color:var(--bad)}

/* result */
.result{text-align:center;align-items:center}
.bigstars{font-size:3.4rem;letter-spacing:.15em;color:var(--star);line-height:1}
.bigstars .off{color:var(--line)}

/* intro */
.intro .goal{font-size:1.15rem}
.gu{font-size:.95rem;color:var(--muted);border-top:2px dashed var(--line);padding-top:12px}

@media (max-width:560px){
  body{font-size:17px}.hero{grid-template-columns:1fr}.hero svg{display:none}
  .qcard{padding:16px}.q .qt{font-size:1.22rem}.choice{font-size:1.12rem;min-height:56px}
  .pad{grid-template-columns:repeat(3,64px)}.pkey{height:54px}
  .typebox{font-size:1.4rem}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

.kbwrap{display:flex;flex-direction:column;gap:10px;align-items:center;max-width:100%}

.hero2{margin:4px 0 26px;background:var(--card);border:2px solid var(--line);border-radius:22px;overflow:hidden}
.hero2 img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.hero2-text{padding:18px 22px 22px}
.hero2 h1{font-size:clamp(2.2rem,7vw,3.4rem);font-weight:800}
.hero2 p{font-size:1.15rem;color:var(--muted);margin-top:6px;max-width:56ch}

.subj-pic{flex-direction:column;align-items:stretch;padding:0;overflow:hidden;gap:0}
.subj-pic .sp{display:block;width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;object-position:center 30%;background:#fff;border-bottom:4px solid var(--sc)}
.subj-pic>div{padding:14px 16px 16px}
.subj-head .sh-pic{width:96px;height:96px;border-radius:20px;object-fit:cover;flex:none;border:3px solid var(--sub);background:#fff}
@media (max-width:560px){.subjects{grid-template-columns:1fr 1fr;gap:10px}.subj-pic>div{padding:10px 12px 12px}.subj-pic b{font-size:1.2rem}.subj-pic span{font-size:.85rem}.subj-head .sh-pic{width:72px;height:72px}}