/* Theme follows PocketChess: monochrome base, small colour accents. */
:root{
  --ink:#141414;--ink2:#3a3a3a;--mute:#6f6f6f;--line:#d6d6d6;--paper:#f2f2f2;--card:#fff;--bar:#fafafa;
  --on-ink:#fff;--top-bg:#141414;--accent:#2f8f6b;--bad:#c9473b;
  --r-topic:#2f8f6b;--r-subject:#4f8ec9;--r-object:#d9a22c;--r-verb:#8e6bbf;--r-other:#a0a0a0;
  --head:52px;--gut:16px;
  --jp:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic","Meiryo",sans-serif;
  font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue","Segoe UI",Roboto,Arial,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ink:#ececec;--ink2:#c4c4c4;--mute:#9a9a9a;--line:#333;--paper:#121212;--card:#1d1d1d;--bar:#171717;
  --on-ink:#121212;--top-bg:#000;--accent:#3fb489;--bad:#e0685c;color-scheme:dark;
}}
:root[data-theme="dark"]{
  --ink:#ececec;--ink2:#c4c4c4;--mute:#9a9a9a;--line:#333;--paper:#121212;--card:#1d1d1d;--bar:#171717;
  --on-ink:#121212;--top-bg:#000;--accent:#3fb489;--bad:#e0685c;color-scheme:dark;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--paper);color:var(--ink);-webkit-text-size-adjust:100%}
body{min-height:100dvh;display:flex;flex-direction:column;line-height:1.45;font-size:16px}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;touch-action:manipulation}
h1,h2,h3,p{margin:0}
a{color:inherit}
.jp{font-family:var(--jp)}
.muted{color:var(--mute)}.center{text-align:center}.pad{padding:24px}
.small{font-size:14px}.caps{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--mute)}

/* Header */
.top{position:sticky;top:0;z-index:5;background:var(--top-bg);color:#fff;padding-top:env(safe-area-inset-top)}
.top-in{height:var(--head);display:flex;align-items:center;gap:10px;padding:0 calc(var(--gut) + env(safe-area-inset-right)) 0 calc(var(--gut) + env(safe-area-inset-left))}
.top h1{font-size:17px;font-weight:700;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top .dot{width:8px;height:8px;border-radius:50%;background:#3fb489;flex:none}
.hbtn{width:44px;height:44px;margin-left:-12px;display:grid;place-items:center;border-radius:10px;font-size:22px;color:#fff}
.count{font-size:14px;font-variant-numeric:tabular-nums;color:#bbb}
.progress{height:3px;background:#333}.progress i{display:block;height:100%;background:#3fb489;transition:width .2s}

/* Layout */
main{flex:1;width:100%;max-width:560px;margin:0 auto;padding:16px calc(var(--gut) + env(safe-area-inset-right)) 24px calc(var(--gut) + env(safe-area-inset-left));display:flex;flex-direction:column;gap:12px}
.tabbar{position:sticky;bottom:0;display:grid;grid-template-columns:repeat(4,1fr);background:var(--bar);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
.tabbar a{min-height:52px;display:grid;place-items:center;font-size:13px;font-weight:600;color:var(--mute);text-decoration:none}
.tabbar a.on{color:var(--ink);box-shadow:inset 0 2px 0 var(--ink)}
body.in-run .tabbar{display:none}

/* Components */
.card{background:var(--card);border-radius:20px;padding:18px;box-shadow:inset 0 0 0 1px var(--line);display:flex;flex-direction:column;gap:10px}
.hero{background:var(--ink);color:var(--on-ink);box-shadow:none}
.hero .caps,.hero .muted{color:inherit;opacity:.7}
.hero h2{font-size:26px;line-height:1.2}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:12px;background:var(--ink);color:var(--on-ink);font-weight:600;width:100%}
.hero .btn{background:var(--on-ink);color:var(--ink)}
.btn.ghost{background:var(--card);color:var(--ink);box-shadow:inset 0 0 0 1px var(--line)}
.row{display:flex;align-items:center;gap:12px;min-height:44px}
.row .grow{flex:1;min-width:0}
.list{padding:6px 18px;gap:0}
.list .row{padding:9px 0;border-bottom:1px solid var(--line)}
.list .row:last-child{border-bottom:0}
.tap{width:100%;text-align:left}
.num{font-weight:700;font-variant-numeric:tabular-nums}
.week{display:flex;gap:6px}
.week i{width:14px;height:14px;border-radius:50%;background:var(--line)}
.week i.on{background:var(--accent)}
.seg{display:flex;background:var(--line);border-radius:12px;padding:3px;gap:3px}
.seg button{flex:1;min-height:44px;border-radius:10px;font-size:14px;font-weight:600;color:var(--ink2)}
.seg button.on{background:var(--card);color:var(--ink)}

/* Kanji */
.glyph{font-family:var(--jp);font-size:112px;line-height:1.15;text-align:center;padding:18px 0}
.glyph.word{font-size:56px;padding:40px 0}
.facts{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;align-items:baseline}
.facts dt{font-size:12px;font-weight:700;color:var(--mute);text-transform:uppercase;letter-spacing:.05em}
.facts dd{margin:0}
.part{display:flex;gap:12px;align-items:flex-start;padding-top:10px;border-top:1px solid var(--line)}
.part b{font-family:var(--jp);font-size:28px;line-height:1.1;min-width:36px;text-align:center}
.part img{width:56px;height:56px;border-radius:8px}
.rate{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.rate button{min-height:60px;border-radius:12px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);font-weight:600;font-size:14px;display:flex;flex-direction:column;align-items:center;justify-content:center}
.rate small{font-weight:500;font-size:12px;color:var(--mute)}
.rate .again{color:var(--bad)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(76px,1fr));gap:8px}
.tile{position:relative;aspect-ratio:1;background:var(--card);border-radius:14px;box-shadow:inset 0 0 0 1px var(--line);font-family:var(--jp);font-size:32px;display:grid;place-items:center}
.tile.seen::after{content:"";position:absolute;top:8px;right:8px;width:7px;height:7px;border-radius:50%;background:var(--accent)}

/* Sentence drill */
.en{font-size:20px;font-weight:600;line-height:1.3}
.answer{min-height:76px;display:flex;flex-wrap:wrap;gap:6px;align-content:flex-start;padding:10px;background:var(--paper);border-radius:14px}
.pool{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;min-height:60px}
.block{--c:var(--r-other);min-height:48px;min-width:48px;padding:5px 12px 5px;border-radius:10px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line),inset 0 -4px 0 var(--c);display:inline-flex;flex-direction:column;align-items:center;justify-content:center;font-family:var(--jp);font-size:19px;line-height:1.25}
.block small{font-size:10px;color:var(--mute)}
.block.topic{--c:var(--r-topic)}.block.subject{--c:var(--r-subject)}.block.object{--c:var(--r-object)}.block.verb{--c:var(--r-verb)}
.block.particle{background:var(--ink);color:var(--on-ink);box-shadow:none}
.block.used{visibility:hidden}
.block.placed{min-height:44px}
.block.shake{animation:shake .3s;box-shadow:inset 0 0 0 2px var(--bad)}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
@media (prefers-reduced-motion:reduce){.block.shake{animation:none}}
.legend{display:flex;flex-wrap:wrap;gap:4px 12px;font-size:12px;color:var(--mute)}
.legend span{display:inline-flex;align-items:center;gap:5px}
.legend i{width:10px;height:10px;border-radius:3px;background:var(--c,var(--r-other))}
.legend .topic{--c:var(--r-topic)}.legend .subject{--c:var(--r-subject)}.legend .object{--c:var(--r-object)}.legend .verb{--c:var(--r-verb)}.legend .particle{--c:var(--ink)}
.fb{padding:10px 14px;border-radius:12px;font-size:15px;background:var(--card);box-shadow:inset 3px 0 0 var(--mute),inset 0 0 0 1px var(--line)}
.fb.bad{box-shadow:inset 3px 0 0 var(--bad),inset 0 0 0 1px var(--line)}
.fb.good{box-shadow:inset 3px 0 0 var(--accent),inset 0 0 0 1px var(--line)}
.fb:empty{display:none}

/* Particle drill */
.pline{font-family:var(--jp);font-size:26px;text-align:center;padding:14px 0}
.blank{display:inline-block;min-width:44px;margin:0 4px;border-bottom:3px solid var(--ink);text-align:center;color:var(--accent);font-weight:700}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(72px,1fr));gap:8px}
.opt{min-height:60px;border-radius:12px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);font-family:var(--jp);font-size:24px}
.opt.wrong{color:var(--bad);box-shadow:inset 0 0 0 2px var(--bad);opacity:.6}
.opt.right{color:var(--on-ink);background:var(--accent);box-shadow:none}
.pbig{font-family:var(--jp);font-size:36px;font-weight:700;min-width:44px;text-align:center}
.exrow{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;padding:6px 0}