:root{
  --desk:#2C3531; --paper:#FAF8F5; --ink:#2D3142; --mute:#6B7080; --line:#E6E0D6;
  --teal:#3B8EA5; --teal-l:#EBF5F7; --coral:#E06D53; --coral-l:#FDF0ED; --must:#F4B942; --must-l:#FEF9EC;
  --y:#FDE68A; --b:#BAE6FD; --v:#DDD6FE; --g:#BBF7D0;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--desk);color:var(--ink);font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei","Hiragino Sans","Yu Gothic",system-ui,sans-serif;font-size:16px;line-height:1.6;display:flex;flex-direction:column;overflow:hidden}
button,select,input,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:0;border-radius:10px;padding:8px 12px;background:#fff;touch-action:manipulation}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--must);outline-offset:2px}
.jp{font-family:"Hiragino Sans","Yu Gothic","Noto Sans JP","Noto Sans TC",sans-serif}

/* top bar */
.top{display:flex;gap:10px;align-items:center;padding:8px 14px;background:#24504F;color:#F3F0E8;flex-wrap:wrap}
.top button{background:transparent;color:#F3F0E8;padding:7px 11px;white-space:nowrap}
.top button:hover{background:rgba(255,255,255,.12)}
.tabs{display:flex;gap:4px}
.tabs .on{background:#173B3A;font-weight:700}
.mid{flex:1;display:flex;gap:8px;align-items:center;justify-content:center;min-width:0}
.mid select,.mid input{background:#173B3A;color:#F3F0E8;border:1px solid #3F6B69;border-radius:10px;padding:6px 10px;min-width:0}
.mid select{max-width:260px}.mid input{width:190px}
.mid input::placeholder{color:#A9C2C0}
.pageno{font-variant-numeric:tabular-nums;white-space:nowrap;font-weight:700}
.acts{display:flex;gap:4px}
.top .nv{font-size:22px;line-height:1;padding:5px 13px;background:#173B3A;font-weight:700}
.top .nv:disabled{opacity:.3;cursor:default}

main{flex:1;min-height:0;position:relative;padding:12px 14px 14px}

/* book */
.book{height:100%;max-width:1500px;margin:0 auto;display:grid;grid-template-columns:42fr 14px 58fr;border-radius:14px;overflow:hidden;box-shadow:0 14px 40px rgba(0,0,0,.45);position:relative}
.pg{background:var(--paper);overflow:auto;padding:18px 22px 20px;min-width:0}
.pg.l{border-left:8px solid var(--coral)}
.spine{background:linear-gradient(90deg,rgba(0,0,0,.02) 0%,rgba(0,0,0,.12) 50%,rgba(0,0,0,.02) 100%),var(--paper)}
h1.ttl{margin:0 0 10px;font-size:26px;line-height:1.3;color:var(--coral);text-wrap:balance}
h1.ttl .no{font-variant-numeric:tabular-nums}
.badges{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.bdg{font-size:12.5px;padding:2px 9px;border-radius:99px;background:#EEE9DF;color:#4A4E5E}
.bdg.hot{background:var(--coral-l);color:#A8442E;font-weight:700}
.bdg.ok{background:#DDF3E3;color:#256B3C;font-weight:700}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin-bottom:12px}
.card h2{margin:0 0 8px;font-size:15px;color:var(--mute);font-weight:700}
.prompt{font-size:20px;font-weight:700;line-height:1.5}
.prompt .jp{font-size:21px}
.story{font-size:13px;color:var(--mute);margin-top:6px}
.warn{margin-top:10px;background:var(--coral-l);border-left:4px solid var(--coral);border-radius:8px;padding:8px 10px;font-size:14.5px}
.warn s{color:#A8442E;text-decoration-thickness:2px}
.ex{margin:8px 0 0;padding:0;list-style:none;font-size:14.5px}
.ex li{padding:6px 0;border-top:1px dashed var(--line)}
.ex .jp{font-weight:700}

.slots{min-height:58px;border:2px dashed #CFC8BA;border-radius:12px;padding:8px;display:flex;flex-wrap:wrap;gap:7px;align-content:flex-start;background:#FDFCFA}
.slots.good{border-color:#3F9E5C;background:#EFFAF2;border-style:solid}
.slots.bad{animation:shake .35s}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.bank{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px;min-height:46px}
.blk{font-size:19px;font-weight:700;padding:7px 12px;border-radius:11px;background:#fff;border:1.5px solid #D9D2C5;box-shadow:0 2px 0 #D9D2C5;min-height:44px}
.blk.y{background:var(--y);border-color:#E8C95A;box-shadow:0 2px 0 #E8C95A}
.blk.b{background:var(--b);border-color:#86C9EC;box-shadow:0 2px 0 #86C9EC}
.blk.v{background:#F1EEFE;border:1.5px dashed #8B6FC0;box-shadow:none}
.blk.g{background:var(--g);border-color:#86D9A4;box-shadow:0 2px 0 #86D9A4}
.blk.wrong{outline:3px solid var(--coral)}
.ctrl{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.ctrl button{background:#EEE9DF;font-size:14.5px}
.ctrl .go{background:var(--teal);color:#fff;font-weight:700}
.fb{margin-top:10px;font-weight:700;min-height:1.6em}
.fb.good{color:#256B3C}.fb.bad{color:#A8442E}
.opts{display:grid;gap:8px}
.opt{text-align:left;background:#fff;border:1.5px solid #D9D2C5;box-shadow:0 2px 0 #D9D2C5;padding:10px 14px;display:flex;gap:10px;align-items:baseline;flex-wrap:wrap}
.opt b{font-size:19px}.opt span{font-size:13.5px;color:var(--mute)}
.opt.good{background:#DDF3E3;border-color:#3F9E5C}.opt.bad{background:var(--coral-l);border-color:var(--coral)}

/* right page */
.sec-h{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.sec-h h2{margin:0;font-size:15px;color:var(--mute);flex:1}
.sec-h button{background:#EEE9DF;font-size:13.5px;padding:6px 10px}
.sec-h button.on{background:var(--teal);color:#fff}
.train{display:flex;flex-wrap:wrap;gap:10px 2px;align-items:flex-start}
.st{display:flex;flex-direction:column;align-items:center;gap:2px;background:none;padding:0;border-radius:12px}
.st .w{font-size:18px;font-weight:700;padding:5px 11px;border-radius:99px;background:#fff;border:2px solid #D9D2C5;white-space:nowrap}
.st.y .w{background:var(--y);border-color:#E8C95A}
.st.b .w{background:var(--b);border-color:#86C9EC}
.st.v .w{background:#F1EEFE;border:2px dashed #8B6FC0}
.st.g .w{background:var(--g);border-color:#5FBF85}
.st .m{font-size:12px;color:var(--mute);max-width:9em;text-align:center;line-height:1.3}
.arr{color:#B9B2A4;padding-top:8px;font-size:13px}
.brains{display:grid;grid-template-columns:1fr 26px 1fr;gap:6px;align-items:stretch;margin-bottom:12px}
.brain{border-radius:14px;padding:12px 14px;font-size:15px}
.brain h3{margin:0 0 6px;font-size:15.5px}
.brain.tw{background:var(--coral-l)}.brain.tw h3{color:#A8442E}
.brain.jp{background:var(--teal-l)}.brain.jp h3{color:#23697D}
.brains .mid-a{display:grid;place-items:center;color:var(--coral);font-size:20px}
.coach{background:var(--must-l);border:1px solid #F1DCA5;border-radius:14px;padding:12px 14px}
.coach h3{margin:0 0 6px;font-size:15.5px}
.coach p{margin:4px 0;font-size:15px}
.pill{display:inline-block;font-size:12px;font-weight:700;background:var(--must);border-radius:99px;padding:1px 9px;margin-right:6px}
.formula{font-weight:700}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.chip{font-size:13px;background:#fff;border:1px solid #E5D9B5;border-radius:99px;padding:3px 10px}
button.chip{color:#23697D;border-color:#B9DCE5;font-weight:700}
.fishbox svg{width:100%;height:auto;display:block}

/* mind map + fishbone views */
.canvas{height:100%;background:var(--paper);border-radius:14px;position:relative;overflow:hidden;box-shadow:0 14px 40px rgba(0,0,0,.45)}
.canvas>svg{width:100%;height:100%;display:block;touch-action:none;cursor:grab}
.tools{position:absolute;left:12px;top:12px;display:flex;gap:6px;flex-wrap:wrap;z-index:2;max-width:calc(100% - 24px)}
.tools button,.tools select{background:#fff;border:1px solid var(--line);border-radius:10px;padding:7px 11px;font-size:14px}
.tools button.on{background:var(--teal);color:#fff;border-color:var(--teal)}
.hint{position:absolute;left:12px;bottom:10px;font-size:13px;color:var(--mute);background:rgba(250,248,245,.9);padding:2px 8px;border-radius:8px}
.scroll{position:absolute;inset:58px 0 0 0;overflow:auto}
svg text{font-family:inherit;fill:var(--ink)}
svg .lk{cursor:pointer}
svg .lk:hover text{fill:var(--teal)}

.drawer{position:fixed;right:0;top:0;bottom:0;width:min(380px,92vw);background:#fff;box-shadow:-10px 0 30px rgba(0,0,0,.3);z-index:20;padding:18px;overflow:auto}
.drawer h3{margin:0 0 8px;color:var(--coral)}
.drawer .jp{font-size:19px;font-weight:700}
.drawer .x{float:right;background:#EEE9DF}
.drawer .open{background:var(--teal);color:#fff;font-weight:700;width:100%;margin-top:14px;padding:12px}
.drawer ul{padding-left:0;list-style:none}
.drawer li button{width:100%;text-align:left;background:#F6F3EC;margin-bottom:6px}

.modal{position:fixed;inset:0;background:rgba(30,36,34,.55);backdrop-filter:blur(8px);z-index:30;display:grid;place-items:center;padding:14px}
.modal[hidden],.drawer[hidden],.toast[hidden]{display:none}
.dlg{background:var(--paper);border-radius:16px;width:min(860px,100%);max-height:100%;overflow:auto;padding:20px 22px}
.dlg h2{margin:0 0 6px}
.dlg p{margin:6px 0;font-size:14.5px;color:#4A4E5E}
.dlg textarea{width:100%;height:210px;border:1.5px solid #D9D2C5;border-radius:12px;padding:10px;background:#fff;resize:vertical}
.dlg input[type=text],.dlg input[type=password]{width:100%;border:1.5px solid #D9D2C5;border-radius:10px;padding:8px 10px;background:#fff}
.dlg label{display:block;font-size:14px;font-weight:700;margin-top:10px}
.row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.row button{background:#EEE9DF}
.row .go{background:var(--teal);color:#fff;font-weight:700}
.result{margin-top:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14.5px;max-height:220px;overflow:auto}
.result li{margin:2px 0}
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:#2D3142;color:#fff;padding:10px 16px;border-radius:12px;z-index:40;max-width:90vw}
.empty{color:#F3F0E8;text-align:center;padding:40px}

@media (max-width:900px),(orientation:portrait) and (max-width:1000px){
  body{overflow:auto}
  main{padding:8px}
  .book{grid-template-columns:1fr;height:auto}
  .spine{display:none}
  .pg{overflow:visible;padding:14px}
  .pg.r{border-left:8px solid var(--teal)}
  .brains{grid-template-columns:1fr}.brains .mid-a{transform:rotate(90deg)}
  .canvas{height:calc(100dvh - 130px)}
  .mid{order:3;flex-basis:100%;flex-wrap:wrap;justify-content:flex-start}
  .mid select{flex:1;max-width:none}
  .mid input{flex:1;width:auto}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}