:root{
  --paper:#F3EBD3; --paper-2:#EADFC0; --ink:#34495E; --ink-soft:#6B5B45; --root:#7A4B34;
  --c0:#A9C9CE; --c1:#DE9C84; --c2:#E6BE55; --c3:#86B8A4; --c4:#C2CF85; --c5:#92A596; --c6:#AE9FC6; --c7:#DB9588;
  --radius:28px;
  font-family:"Hiragino Maru Gothic ProN","Hiragino Sans","Noto Sans JP","Yu Gothic","Noto Sans Bengali","Kalpurush","Nirmala UI",system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#262A2B; --paper-2:#303536; --ink:#E6EEF2; --ink-soft:#C9BCA3; --root:#C99A7C}
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{background:var(--paper)}
body{margin:0;color:var(--ink);background:
  radial-gradient(circle at 12% 8%,rgba(222,156,132,.22) 0 90px,transparent 91px),
  radial-gradient(circle at 92% 38%,rgba(134,184,164,.2) 0 110px,transparent 111px),
  var(--paper);
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  min-height:100dvh}
.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);padding:10px 14px 8px;border-bottom:2px solid var(--paper-2)}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:10px}
h1{font-size:1.1rem;margin:0;font-weight:800;letter-spacing:.01em}
.seg{display:flex;background:var(--paper-2);border-radius:999px;padding:3px}
.seg button{border:0;background:transparent;color:var(--ink);font:inherit;font-size:.85rem;font-weight:700;padding:6px 14px;border-radius:999px;cursor:pointer;min-height:36px}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.kana-nav{display:flex;gap:8px;overflow-x:auto;padding:10px 2px 4px;scrollbar-width:none}
.kana-nav::-webkit-scrollbar{display:none}
.kana-nav button{flex:0 0 auto;width:48px;height:48px;border-radius:50%;border:3px solid var(--paper-2);background:transparent;color:var(--ink);font:inherit;font-size:1.5rem;font-weight:800;cursor:pointer}
.kana-nav button[aria-current="true"]{background:var(--ink);color:var(--paper);border-color:var(--root)}
:focus-visible{outline:3px solid var(--c1);outline-offset:2px}

main{max-width:560px;margin:0 auto;padding:18px 14px 90px}
.hero{display:flex;align-items:center;gap:18px;margin-bottom:22px}
.ring{flex:0 0 auto;width:132px;height:132px;border-radius:50%;padding:10px;
  background:conic-gradient(var(--c1),var(--c7),var(--root),var(--c2),var(--c3),var(--c6),var(--c1));
  box-shadow:0 6px 0 rgba(122,75,52,.25)}
.ring-in{width:100%;height:100%;border-radius:50%;background:var(--paper);display:grid;place-content:center;text-align:center}
.ring-kana{font-size:3.6rem;line-height:1;font-weight:800;color:var(--ink)}
.ring-romaji{font-size:1rem;font-weight:800;color:var(--root);margin-top:2px}
.hero p{margin:0;font-size:.95rem;color:var(--ink-soft);line-height:1.5}

.tree{list-style:none;margin:0;padding:0 0 0 34px;position:relative;display:grid;gap:12px}
.tree::before{content:"";position:absolute;left:12px;top:-12px;bottom:26px;width:5px;border-radius:5px;
  background:linear-gradient(var(--c0),var(--c1),var(--c2),var(--c3),var(--c4),var(--c5),var(--c6),var(--c7),var(--c2),var(--c3))}
.card{--c:var(--c0);position:relative;display:flex;align-items:center;gap:10px;background:var(--c);color:#2c3a46;
  border-radius:var(--radius);padding:10px 10px 10px 18px;min-height:84px;cursor:pointer;
  transition:transform .18s ease,filter .18s ease;box-shadow:0 3px 0 rgba(0,0,0,.12)}
.card::before{content:"";position:absolute;left:-22px;top:50%;width:22px;height:5px;background:var(--c);transform:translateY(-50%)}
.card::after{content:"";position:absolute;left:-27px;top:50%;width:14px;height:14px;border-radius:50%;background:var(--c);border:3px solid var(--paper);transform:translateY(-50%)}
.card:active,.card.zoom{transform:scale(1.035);filter:saturate(1.2) brightness(1.04)}
.card:nth-child(8n+1){--c:var(--c0)}.card:nth-child(8n+2){--c:var(--c1)}.card:nth-child(8n+3){--c:var(--c2)}.card:nth-child(8n+4){--c:var(--c3)}
.card:nth-child(8n+5){--c:var(--c4)}.card:nth-child(8n+6){--c:var(--c5)}.card:nth-child(8n+7){--c:var(--c6)}.card:nth-child(8n+8){--c:var(--c7)}
.txt{flex:1;min-width:0}
.hira{font-size:1.9rem;font-weight:800;line-height:1.15;word-break:keep-all}
.line2{display:flex;flex-wrap:wrap;gap:2px 8px;align-items:baseline;margin-top:2px}
.rom{font-weight:800;font-size:.95rem;color:#5b3a22}
.mean{font-size:.95rem;font-weight:600}
.mean[lang="bn"]{font-size:1.02rem}
.kanji{font-size:.8rem;opacity:.75;margin-top:2px}
.pic{flex:0 0 auto;width:74px;height:74px;border-radius:50%;background:rgba(255,255,255,.55);display:grid;place-items:center;font-size:2.3rem;overflow:hidden;border:3px solid rgba(255,255,255,.85);box-shadow:0 3px 8px rgba(0,0,0,.15)}
.pic img{width:100%;height:100%;object-fit:cover}
.spk{flex:0 0 auto;width:48px;height:48px;border-radius:50%;border:0;background:rgba(44,58,70,.88);color:#fff;cursor:pointer;display:grid;place-items:center}
.spk svg{width:22px;height:22px;fill:currentColor}
.spk.playing{background:var(--root);animation:pulse .7s ease-in-out infinite alternate}
@keyframes pulse{to{transform:scale(1.12)}}

.foot{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:space-between;align-items:center;gap:10px;
  padding:8px 14px calc(8px + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--paper) 94%,transparent);backdrop-filter:blur(8px);border-top:2px solid var(--paper-2);font-size:.8rem}
.net{color:var(--ink-soft);font-weight:700}
.install{border:0;border-radius:999px;background:var(--root);color:#fff;font:inherit;font-weight:800;padding:9px 16px;min-height:40px;cursor:pointer}
.sheet{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:flex-end;justify-content:center;z-index:20}
.sheet[hidden]{display:none}
.sheet-card{background:var(--paper);width:min(560px,100%);border-radius:28px 28px 0 0;padding:22px 20px calc(22px + env(safe-area-inset-bottom));animation:up .25s ease-out}
.sheet-card h2{margin:0 0 10px;font-size:1.2rem}
.sheet-card ol{padding-left:22px;line-height:1.8;margin:0 0 16px}
.primary{width:100%;border:0;border-radius:999px;background:var(--ink);color:var(--paper);font:inherit;font-weight:800;padding:13px;min-height:48px;cursor:pointer}
@keyframes up{from{transform:translateY(40px);opacity:0}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* tabs */
.tabs{display:flex;gap:6px;margin-top:8px}
.tabs button{flex:1;border:0;border-bottom:4px solid transparent;background:transparent;color:var(--ink-soft);font:inherit;font-weight:800;font-size:.95rem;padding:8px 4px;min-height:44px;cursor:pointer}
.tabs .tab-link{flex:1;display:flex;align-items:center;justify-content:center;text-align:center;text-decoration:none;border-bottom:4px solid transparent;background:transparent;color:var(--ink-soft);font:inherit;font-weight:800;font-size:.95rem;padding:8px 4px;min-height:44px;cursor:pointer}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--root)}
.learned{margin-top:6px!important;font-weight:800;color:var(--root)!important}
.card.done .hira::after{content:" ✓";font-size:1.1rem;color:#2d6a4f}

/* quiz */
.quiz[hidden],.tree[hidden],.hero[hidden]{display:none}
.q-top{display:flex;justify-content:center;margin-bottom:14px}
.q-prog{display:flex;align-items:center;gap:12px;font-weight:800;font-size:.9rem;margin-bottom:12px}
.bar{flex:1;height:10px;border-radius:10px;background:var(--paper-2);overflow:hidden}
.bar i{display:block;height:100%;background:var(--c3);border-radius:10px;transition:width .3s}
.q-card{position:relative;background:var(--c0);color:#2c3a46;border-radius:var(--radius);padding:26px 18px 22px;text-align:center;box-shadow:0 3px 0 rgba(0,0,0,.12);margin-bottom:14px}
.q-big{font-size:2.8rem;font-weight:800;line-height:1.2}
.q-big.meaning{font-size:1.8rem}
.q-sub{font-size:1rem;opacity:.75;margin-top:2px}
.q-ask{margin-top:10px;font-weight:700;font-size:.95rem}
.q-card .spk{position:absolute;right:12px;top:12px}
.q-opts{display:grid;gap:10px}
.opt{display:flex;align-items:center;justify-content:center;gap:8px;min-height:60px;border:3px solid var(--paper-2);border-radius:20px;background:transparent;color:var(--ink);font:inherit;font-size:1.15rem;font-weight:800;padding:10px 14px;cursor:pointer}
.opt small{font-size:.8rem;color:var(--ink-soft)}
.opt:active:not(:disabled){transform:scale(1.02)}
.opt b{font-size:1.1rem}
.opt.good{background:#CFE8D5;border-color:#2d6a4f;color:#1b4332}
.opt.bad{background:#F4D0CA;border-color:#a4402f;color:#6b1f12}
.opt:disabled{cursor:default}
.q-fb{margin:14px 0 10px;font-weight:800;text-align:center}
.q-fb.ok{color:#2d6a4f}.q-fb.no{color:#a4402f}
.q-note{text-align:center;color:var(--ink-soft)}
.q-result{text-align:center;display:grid;gap:12px;padding-top:16px}
.q-result .face{font-size:4rem}
.q-result h2{margin:0}
.ghost{width:100%;border:3px solid var(--paper-2);border-radius:999px;background:transparent;color:var(--ink);font:inherit;font-weight:800;padding:12px;min-height:48px;cursor:pointer}
@media (prefers-color-scheme:dark){.opt.good{background:#24402f;color:#cfe8d5}.opt.bad{background:#4a2520;color:#f4d0ca}}

.groups{display:flex;gap:6px;margin-top:8px;overflow-x:auto;scrollbar-width:none}
.groups::-webkit-scrollbar{display:none}
.groups button{flex:0 0 auto;border:2px solid var(--paper-2);background:transparent;color:var(--ink);font:inherit;font-size:.85rem;font-weight:800;padding:6px 14px;border-radius:999px;min-height:36px;cursor:pointer}
.groups button[aria-pressed="true"]{background:var(--root);border-color:var(--root);color:#fff}
.kana-nav{scroll-behavior:smooth}

.tree{grid-template-columns:minmax(0,1fr)}
.hira{overflow-wrap:anywhere}
.hira.mid{font-size:1.6rem}
.hira.long{font-size:1.35rem}

/* footer: keep controls left, clear of the host's corner badge */
.foot{justify-content:flex-start;padding-right:170px;flex-wrap:wrap}
.chip{border:2px solid var(--paper-2);background:transparent;color:var(--ink);font:inherit;font-size:.8rem;font-weight:800;padding:6px 12px;border-radius:999px;min-height:36px;cursor:pointer}
.chip[hidden]{display:none}
.install{padding:7px 12px;min-height:36px;font-size:.8rem}

/* page background: soft sakura and maple leaves like the original chart */
body{background-image:
  url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='420' height='420' viewBox='0 0 420 420'><g fill='%23E9A9B5' fill-opacity='.38'><g transform='translate(70 80) rotate(10)'><ellipse cx='0' cy='-17' rx='10' ry='17'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(72)'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(144)'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(216)'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(288)'/></g><g transform='translate(330 250) rotate(-20) scale(1.3)'><ellipse cx='0' cy='-17' rx='10' ry='17'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(72)'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(144)'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(216)'/><ellipse cx='0' cy='-17' rx='10' ry='17' transform='rotate(288)'/></g><ellipse cx='200' cy='360' rx='6' ry='10' transform='rotate(35 200 360)'/><ellipse cx='370' cy='60' rx='5' ry='9' transform='rotate(-30 370 60)'/></g><g fill='%23D9A05B' fill-opacity='.34'><path transform='translate(210 120) rotate(25) scale(1.1)' d='M0-26 L6-12 L20-18 L14-4 L26 0 L14 6 L18 20 L5 14 L0 28 L-5 14 L-18 20 L-14 6 L-26 0 L-14-4 L-20-18 L-6-12Z'/><path transform='translate(60 300) rotate(-15) scale(.9)' d='M0-26 L6-12 L20-18 L14-4 L26 0 L14 6 L18 20 L5 14 L0 28 L-5 14 L-18 20 L-14 6 L-26 0 L-14-4 L-20-18 L-6-12Z'/></g></svg>"),
  radial-gradient(circle at 12% 8%,rgba(222,156,132,.22) 0 90px,transparent 91px),
  radial-gradient(circle at 92% 38%,rgba(134,184,164,.2) 0 110px,transparent 111px);
  background-attachment:fixed,scroll,scroll;background-size:420px 420px,auto,auto}
@media (prefers-color-scheme:dark){body{background-blend-mode:soft-light}}

/* ---- readability update ---- */
.ring{width:152px;height:152px}
.ring-kana{font-size:4.6rem}
.ring-romaji{font-size:1.15rem}
.hero{gap:16px}
.hero p{font-size:1rem;font-weight:800;color:var(--ink)}
.hero p.learned{color:#7B3F1D;font-weight:800;font-size:1.05rem}
@media (prefers-color-scheme:dark){.hero p.learned{color:#E0A57F}}

.hira{font-size:2.3rem}
.hira.mid{font-size:1.85rem}
.hira.long{font-size:1.5rem}
.rom{font-size:1.2rem}
.mean{font-size:1.2rem}
.mean[lang="bn"]{font-size:1.3rem}
.kanji{display:inline-block;margin-top:6px;padding:1px 12px 3px;border-radius:999px;background:rgba(255,255,255,.4);
  font-family:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP","Noto Serif CJK JP","MS Mincho",serif;
  font-size:1.35rem;font-weight:700;letter-spacing:.06em;opacity:1;color:#3b2a1f}
@media (max-width:380px){
  .pic{width:64px;height:64px}
  .spk{width:42px;height:42px}
  .hira{font-size:2rem}.hira.mid{font-size:1.6rem}.hira.long{font-size:1.3rem}
  .ring{width:136px;height:136px}.ring-kana{font-size:4.1rem}
}

/* ---- layout update: no fixed footer, compact pinned header ---- */
.top{top:0}
.tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:-4px 0 14px}
.net{font-size:.8rem;font-weight:800;color:var(--ink-soft);margin-right:2px}
.net::before{content:"";display:inline-block;width:9px;height:9px;border-radius:50%;background:#4f9d69;margin-right:6px}
main{padding-bottom:84px}
.ring{width:164px;height:164px}
.ring-kana{font-size:4.5rem;line-height:.95}
.ring-romaji{font-size:2.1rem;font-weight:900;line-height:1;margin-top:2px;
  background:linear-gradient(90deg,#C2573D,#D98C2B);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
@media (max-width:380px){.ring{width:146px;height:146px}.ring-kana{font-size:3.9rem}.ring-romaji{font-size:1.8rem}}

/* pinned letter row: solid background so cards do not show through */
.top{background:var(--paper);backdrop-filter:none}

.chip:disabled{opacity:.75;cursor:default}

/* streak, review, listening question */
.streak{font-size:.8rem;font-weight:800;color:#7B3F1D;background:rgba(255,255,255,.55);border-radius:999px;padding:6px 12px}
.q-top .seg{flex-wrap:wrap;justify-content:center}
.q-top .seg button{padding:6px 12px;font-size:.82rem}
.q-card .spk.big{position:static;width:78px;height:78px;margin:4px auto 12px}
.q-card .spk.big svg{width:34px;height:34px}
.q-reveal{margin-top:12px;font-size:1.5rem;font-weight:800}
.q-reveal small{font-size:.9rem;font-weight:700;color:#5b3a22}
.q-streak{font-weight:800;color:#7B3F1D;margin:0;line-height:1.7}

/* tappable big letter */
button.ring{border:0;font:inherit;color:inherit;cursor:pointer;position:relative;transition:transform .15s ease}
button.ring:active,button.ring.playing{transform:scale(1.05)}
.ring-spk{position:absolute;right:2px;bottom:6px;width:40px;height:40px;border-radius:50%;background:rgba(44,58,70,.9);display:grid;place-items:center;box-shadow:0 2px 6px rgba(0,0,0,.25)}
.ring-spk svg{width:20px;height:20px;fill:#fff}
button.ring.playing .ring-spk{background:#7A4B34;animation:pulse .7s ease-in-out infinite alternate}
.credit{margin:26px 4px 0;font-size:.72rem;color:var(--ink-soft);text-align:center;opacity:.9}

/* stroke order panel */
.stroke-toggle{margin-top:8px}
.stroke-toggle[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.stroke-panel{background:rgba(255,255,255,.55);border-radius:24px;padding:14px 14px 12px;margin:-4px 0 20px;text-align:center;box-shadow:0 3px 0 rgba(0,0,0,.1)}
.stroke-panel[hidden]{display:none}
.stroke-panel h3{margin:0 0 8px;font-size:1.05rem;color:var(--root)}
.stroke-panel p{margin:8px 0 0;font-size:.85rem;color:var(--ink-soft);line-height:1.5}
.stroke-box{width:min(250px,68vw);aspect-ratio:1;margin:0 auto 10px;background:#fffdf6;border:3px solid var(--paper-2);border-radius:18px;cursor:pointer}
.stroke-box svg{width:100%;height:100%;display:block}
.stroke-box .gl{stroke:rgba(122,75,52,.22);stroke-width:.7;stroke-dasharray:3 3}
.stroke-box .sg{fill:none;stroke:rgba(52,73,94,.14);stroke-width:4.4;stroke-linecap:round;stroke-linejoin:round}
.stroke-box .sp{fill:none;stroke:#34495E;stroke-width:4.4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:1;stroke-dashoffset:1;animation:draw .8s ease-in-out forwards}
.stroke-box .sn{opacity:0;animation:pop .2s ease forwards}
.stroke-box .sn circle{fill:#7B3F1D}
.stroke-box .sn text{fill:#fff;font-size:5.9px;font-weight:800;font-family:system-ui,sans-serif}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes pop{to{opacity:1}}
@media (prefers-reduced-motion:reduce){.stroke-box .sp{animation:none!important;stroke-dashoffset:0}.stroke-box .sn{animation:none!important;opacity:1}}
@media (prefers-color-scheme:dark){.stroke-panel{background:rgba(255,255,255,.08)}.stroke-box{background:#1f2324}.stroke-box .sp{stroke:#E6EEF2}.stroke-box .sg{stroke:rgba(230,238,242,.16)}}
.kata-tag{display:inline-block;margin-right:6px;padding:0 6px;border-radius:6px;background:var(--ink);color:var(--paper);font-size:.62rem;font-weight:800;letter-spacing:.04em;vertical-align:1px}
.tabs button,.tabs .tab-link{font-size:.82rem;line-height:1.25;padding:5px 2px;min-height:48px}
.top-row h1{line-height:1.2}
.groups button{flex:1 1 0;font-size:.78rem;line-height:1.2;padding:5px 8px;text-align:center}
.q-top .seg{flex-wrap:nowrap;width:100%}
.q-top .seg button{flex:1 1 0;font-size:.76rem;line-height:1.2;padding:5px 6px}
.chip .hint{display:block;margin-top:1px;font-size:.68rem;font-weight:600;opacity:.65}