:root{--bg:#fbf7f2;--card:#fff;--ink:#1f2a37;--muted:#5b6573;--line:#ece4da;--acc:#0f766e;--acc2:#0d6f78;--coral:#f0735f;--coral-d:#b23f2e;--coral-s:#fff1ec;--teal-s:#e6f5f2;--shadow:0 2px 6px rgba(80,60,40,.06),0 8px 24px rgba(80,60,40,.07);--ok:#15803d;--bad:#b91c1c;--warn:#a16207;--soft:#fef2f2;--zh:"Noto Sans TC","PingFang TC","Microsoft JhengHei","Heiti TC","Noto Sans CJK TC",sans-serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.5;font-size:17px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--acc2)}
.credit-top{font-size:.72rem;text-align:center;color:var(--muted);padding:.25rem .5rem;background:#fff;border-bottom:1px solid var(--line)}
.top{display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.5rem .75rem;background:#fff;border-bottom:1px solid var(--line);flex-wrap:wrap}
.brand{font-weight:700;font-size:1rem;display:flex;align-items:center;gap:.4rem}
.brand .zh{font-size:1.1rem}
.toggles{display:flex;gap:.4rem;align-items:center;flex-wrap:wrap}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:#fff}
.seg button{border:0;background:transparent;padding:.35rem .7rem;font-size:.85rem;min-height:36px}
.seg button.on{background:var(--acc);color:#fff}
.who{border:1px solid var(--line);background:#fff;border-radius:999px;padding:.35rem .7rem;font-size:.82rem;max-width:12rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-height:36px}
.tabs{display:flex;gap:.25rem;overflow-x:auto;padding:.4rem .5rem;background:#fff;border-bottom:1px solid var(--line);scrollbar-width:thin}
.tabs button{flex:0 0 auto;border:1px solid var(--line);background:#fff;border-radius:999px;padding:.4rem .8rem;font-size:.9rem;min-height:40px;white-space:nowrap}
.tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
main{max-width:860px;margin:0 auto;padding:.75rem}
h1{font-size:1.35rem;margin:.4rem 0 .6rem}
h2{font-size:1.15rem;margin:1rem 0 .5rem}
h3{font-size:1rem;margin:.6rem 0 .3rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:.85rem;margin:0 0 .8rem;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.muted{color:var(--muted)}.small{font-size:.82rem}
.row{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}
.hidden{display:none!important}
.zh{font-family:var(--zh);font-size:1.5rem;line-height:2.3;letter-spacing:.02em}
.zh.sm{font-size:1.2rem;line-height:2.1}
.zh.lg{font-size:2.2rem;line-height:2.4}
.zh.xl{font-size:2.8rem;line-height:2.4}
ruby{ruby-position:over;ruby-align:center;margin:0 .03em}
rt{font-family:system-ui,sans-serif;font-size:.5em;color:var(--acc2);letter-spacing:0;line-height:1.1}
body.zy rt{font-family:var(--zh);font-size:.42em}
.py{color:var(--acc2);font-size:1.05rem;font-weight:600}
.tag{display:inline-block;font-size:.72rem;border-radius:999px;padding:.1rem .5rem;background:#f1f5f9;color:#334155;border:1px solid var(--line);margin-right:.25rem}
.tag.bg{background:#fef9c3;border-color:#fde047;color:#713f12}
.tag.cls{background:#ecfeff;border-color:#a5f3fc;color:#155e75}
.btn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:.4rem .75rem;min-height:40px;min-width:40px;font-size:.9rem;display:inline-flex;align-items:center;gap:.3rem}
.btn:active{transform:scale(.97)}
.btn.primary,.primary{background:var(--acc);color:#fff;border:0;border-radius:999px;padding:.5rem 1rem;min-height:42px;font-weight:600}
.btn.mic{border-color:#fca5a5}
.btn.small{min-height:34px;padding:.25rem .6rem;font-size:.82rem}
.audio{display:inline-flex;gap:.3rem;vertical-align:middle}
.vgrid{display:grid;grid-template-columns:1fr;gap:.7rem}
@media(min-width:700px){.vgrid{grid-template-columns:1fr 1fr}}
.vcard .head{display:flex;justify-content:space-between;align-items:flex-start;gap:.5rem}
.vcard .mean{font-size:1.05rem;margin:.1rem 0}
.vcard .mean b{font-weight:700}
.ex{border-left:3px solid #fecaca;padding:.2rem .6rem;margin:.5rem 0;background:#fffafa;border-radius:0 8px 8px 0}
.ex .src{font-size:.75rem;color:var(--muted)}
.sent{border-left:3px solid #bae6fd;padding:.2rem .6rem;margin:.5rem 0;background:#f8fdff;border-radius:0 8px 8px 0}
.chips{display:flex;gap:.35rem;flex-wrap:wrap;margin:.3rem 0 .6rem}
.chips button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:.3rem .7rem;min-height:36px;font-size:.88rem}
.chips button.on{background:var(--acc2);border-color:var(--acc2);color:#fff}
input[type=search],input[type=text],textarea,.box input{width:100%;padding:.55rem .7rem;border:1px solid #cbd5e1;border-radius:10px;background:#fff;font-size:1rem}
textarea{min-height:7rem;font-family:var(--zh);font-size:1.15rem}
.say{margin-top:.4rem;padding:.4rem .6rem;border-radius:10px;background:#f8fafc;border:1px dashed #cbd5e1;font-size:.9rem}
.say .hit{color:var(--ok);font-weight:700}.say .miss{color:var(--bad);text-decoration:underline wavy}
.say .zhm{font-family:var(--zh);font-size:1.4rem}
.flash{min-height:16rem;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer;user-select:none}
.flash .back{margin-top:.6rem}
.qopt{display:flex;width:100%;text-align:left;gap:.6rem;align-items:center;border:1px solid #cbd5e1;background:#fff;border-radius:12px;padding:.55rem .7rem;margin:.35rem 0;min-height:52px}
.qopt .let{flex:0 0 2rem;height:2rem;border-radius:50%;background:#f1f5f9;display:flex;align-items:center;justify-content:center;font-weight:700}
.qopt.right{border-color:var(--ok);background:#f0fdf4}.qopt.right .let{background:var(--ok);color:#fff}
.qopt.wrong{border-color:var(--bad);background:#fef2f2}.qopt.wrong .let{background:var(--bad);color:#fff}
.qopt[disabled]{cursor:default}
.progress{height:8px;background:#e2e8f0;border-radius:99px;overflow:hidden;margin:.3rem 0 .6rem}.progress i{display:block;height:100%;background:var(--acc2)}
.dline{display:flex;gap:.6rem;align-items:flex-start;padding:.45rem 0;border-bottom:1px solid #f1f5f9}
.dline .who{flex:0 0 auto;font-size:.78rem;border-radius:12px;padding:.35rem .5rem .2rem;background:#f1f5f9;white-space:nowrap;max-width:none;overflow:visible;text-align:center;line-height:1.3}
.dline.r-pt .who{background:#fee2e2}.dline.r-e .who{background:#e0f2fe}
.dline .body{flex:1}
.label-class{display:inline-block;background:#fef3c7;color:#78350f;border:1px solid #fcd34d;border-radius:8px;padding:.1rem .5rem;font-size:.78rem;font-weight:600}
.src-line{font-size:.78rem;color:var(--muted);margin-top:.4rem;border-top:1px dashed var(--line);padding-top:.3rem}
.vtable{width:100%;border-collapse:collapse}.vtable td,.vtable th{border-bottom:1px solid var(--line);padding:.35rem .4rem;vertical-align:top;text-align:left}
.vtable th{font-size:.8rem;color:var(--muted)}
.k{display:inline-flex;align-items:center;justify-content:center;min-width:2rem;height:2rem;border-radius:8px;background:var(--acc);color:#fff;font-weight:800;padding:0 .3rem}
.flow{display:flex;flex-direction:column;gap:.3rem;align-items:stretch}
.flow .st{border:2px solid var(--line);border-radius:12px;padding:.4rem .6rem;background:#fff}
.flow .st.red{border-color:#fca5a5;background:#fef2f2}.flow .st.green{border-color:#86efac;background:#f0fdf4}
.flow .arr{text-align:center;color:var(--muted);font-size:1.2rem;line-height:1}
.vit{display:grid;grid-template-columns:1fr;gap:.4rem}@media(min-width:600px){.vit{grid-template-columns:1fr 1fr}}
.vit div{border:1px solid #fecaca;border-radius:10px;padding:.3rem .6rem;display:flex;justify-content:space-between;align-items:center;gap:.4rem;background:#fff}
.vit b{font-family:ui-monospace,monospace;color:var(--bad);white-space:nowrap}
.cards5{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.5rem}
.cards5>div{border:1px solid var(--line);border-radius:12px;padding:.4rem .5rem;background:#fff;text-align:center}
.tl{border-left:3px solid var(--acc2);margin-left:.4rem;padding-left:.8rem}
.tl>div{position:relative;margin:.2rem 0 .7rem}.tl>div:before{content:"";position:absolute;left:-1.18rem;top:.45rem;width:.7rem;height:.7rem;border-radius:50%;background:var(--acc2)}
.split{display:grid;grid-template-columns:1fr;gap:.6rem}@media(min-width:600px){.split{grid-template-columns:1fr 1fr}}
.split>div{border:1px solid var(--line);border-radius:12px;padding:.5rem .6rem}
.split>div:first-child{background:#f0fdf4;border-color:#bbf7d0}.split>div:last-child{background:#fff7ed;border-color:#fed7aa}
.bar{display:flex;height:2.2rem;border-radius:8px;overflow:hidden;margin:.2rem 0 .6rem;border:1px solid var(--line)}
.bar span{display:flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem}
.bar .ice{background:#0ea5e9}.bar .rest{background:#cbd5e1;color:#0f172a}
.steps{display:flex;gap:.4rem;flex-wrap:wrap;align-items:center}
.steps>div{border:1px solid var(--line);border-radius:12px;padding:.3rem .6rem;background:#fff;text-align:center;flex:1 1 140px}
.fb{margin-top:.6rem}.fb .m{border:1px solid var(--line);border-radius:10px;padding:.45rem .6rem;margin:.35rem 0;background:#fff}
.fb .w{color:var(--bad);text-decoration:line-through;font-family:var(--zh);font-size:1.15rem}.fb .r{color:var(--ok);font-family:var(--zh);font-size:1.15rem;font-weight:700}
.ai{font-size:.74rem;color:var(--warn);font-weight:600}
.err{color:var(--bad)}
.notice{border:1px solid #fde68a;background:#fffbeb;border-radius:12px;padding:.55rem .7rem;margin:.5rem 0;font-size:.92rem}
.modal{position:fixed;inset:0;background:rgba(15,23,42,.55);display:flex;align-items:center;justify-content:center;z-index:50;padding:1rem}
.modal .box{background:#fff;border-radius:16px;padding:1rem;max-width:26rem;width:100%;max-height:92vh;overflow:auto}
.box label{display:block;margin:.5rem 0}.box label span{display:block;font-size:.9rem;font-weight:600;margin-bottom:.2rem}
.toast{position:fixed;bottom:1rem;left:50%;transform:translateX(-50%);background:#0f172a;color:#fff;border-radius:999px;padding:.5rem 1rem;z-index:60;font-size:.9rem;max-width:90vw}
.foot{text-align:center;color:var(--muted);font-size:.8rem;padding:1.5rem 1rem 2rem;border-top:1px solid var(--line);background:#fff}
.foot .credit{font-weight:600}
.foot .author{font-weight:600;margin-top:.15rem}
.tonegrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.5rem}
.tonegrid>div{border:1px solid var(--line);border-radius:12px;padding:.5rem;text-align:center;background:#fff}
.tonegrid .n{font-weight:800;color:var(--acc)}
.hint{display:inline-block;margin:.1rem}
.zhi{font-family:var(--zh);font-size:1.12em;line-height:2.1}
.zh .zhi{font-size:1em;line-height:inherit}

/* ---- v4 warm redesign ---- */
body{font-family:"Noto Sans TC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg) radial-gradient(1200px 400px at 100% -10%,#e3f3ef 0,transparent 60%) no-repeat}
.credit-top{background:transparent;border:0}
.top{background:transparent;border:0;padding:.6rem 1rem;max-width:1000px;margin:0 auto}
.brand{font-size:1.02rem;color:var(--ink)}
.brand .logo{display:inline-flex;width:2.1rem;height:2.1rem;border-radius:10px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--coral),#f59e7c);color:#fff;font-size:1.1rem;box-shadow:0 3px 8px rgba(240,115,95,.35)}
.seg{border-color:var(--line);box-shadow:0 1px 2px rgba(0,0,0,.04)}
.seg button.on{background:var(--acc);color:#fff}
.who{border-color:var(--line)}
.tabs{background:rgba(251,247,242,.92);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);padding:.5rem max(.6rem,calc((100% - 1000px)/2));gap:.35rem}
.tabs button{border-color:transparent;background:#fff;box-shadow:0 1px 3px rgba(80,60,40,.08);display:inline-flex;align-items:center;gap:.35rem;padding:.45rem .9rem;font-weight:500;transition:background .15s,color .15s}
.tabs button:hover{background:var(--teal-s)}
.tabs button.on{background:var(--acc);color:#fff;border-color:var(--acc);box-shadow:0 3px 10px rgba(15,118,110,.3)}
.tabs .ti{font-size:1rem;line-height:1}
main{max-width:1000px;padding:1rem}
h1{font-size:1.6rem;line-height:1.3;letter-spacing:-.01em}
h2{font-size:1.2rem;color:var(--ink)}
.card{border:1px solid rgba(236,228,218,.7);border-radius:20px;padding:1.1rem 1.15rem;margin:0 0 1rem;box-shadow:var(--shadow)}
rt{color:var(--acc2);font-weight:500}
.py{color:var(--acc2)}
.btn{border-color:var(--line);transition:background .15s,transform .1s}
.btn:hover{background:var(--teal-s)}
.btn.primary,.primary{background:var(--acc);box-shadow:0 3px 10px rgba(15,118,110,.25)}
.primary:hover{background:#0b5f59}
.primary.big{font-size:1.05rem;padding:.7rem 1.4rem;min-height:48px}
.btn.mic{border-color:#f5b3a6;background:var(--coral-s)}
.tag{background:#f4efe8;border-color:transparent;color:#4b5563}
.tag.cls{background:var(--teal-s);color:#0b5f59}
.tag.bg{background:#fff4d6;border-color:transparent}
.ex{border-left:4px solid var(--coral);background:var(--coral-s);border-radius:0 12px 12px 0;padding:.35rem .75rem}
.sent{border-left:4px solid #5fb8ad;background:var(--teal-s);border-radius:0 12px 12px 0;padding:.35rem .75rem}
.chips button{border-color:var(--line)}
.chips button.on{background:var(--acc2);border-color:var(--acc2)}
input[type=search],input[type=text],textarea,.box input{border-color:#d9cfc3;border-radius:12px}
input:focus,textarea:focus{outline:3px solid rgba(15,118,110,.25);border-color:var(--acc)}
:focus-visible{outline:3px solid var(--coral);outline-offset:2px}
.qopt{border-color:#e1d8cc;border-radius:14px}
.qopt:hover:not([disabled]){background:var(--teal-s)}
.progress{background:#efe7dc}.progress i{background:linear-gradient(90deg,var(--acc),#34a39a)}
.dline .who{background:#f4efe8}.dline.r-pt .who{background:#ffe3dc}.dline.r-e .who{background:#d9f0ec}
.dline{border-bottom-color:#f3ede5}
.k,.tonegrid .n{background:var(--coral-d)}.tonegrid .n{background:none;color:var(--coral-d)}
.tonegrid>div,.cards5>div,.steps>div,.split>div,.flow .st{border-radius:16px}
.modal .box{border-radius:22px;box-shadow:0 20px 50px rgba(0,0,0,.2)}
.toast{background:var(--ink)}
.foot{background:transparent;border-top:1px solid var(--line)}
.hero{display:grid;grid-template-columns:1fr;gap:1rem;align-items:center;background:linear-gradient(135deg,#fff 0,#fff6f1 55%,#e7f6f2 100%);border-radius:26px;padding:1.4rem 1.3rem;margin:.2rem 0 1.2rem;box-shadow:var(--shadow);border:1px solid rgba(236,228,218,.8)}
.hero h1{margin-top:0}
.hero p{color:#3f4a57;font-size:1.05rem}
.hero-word{text-align:center;background:#fff;border-radius:20px;padding:.4rem 1rem;box-shadow:0 2px 10px rgba(240,115,95,.15)}
.hero-word .zh{color:var(--coral-d)}
@media(min-width:720px){.hero{grid-template-columns:1.4fr 1fr;padding:2rem}.hero h1{font-size:2rem}}
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.75rem;margin-bottom:1.2rem}
.tile{display:flex;flex-direction:column;align-items:flex-start;gap:.25rem;text-align:left;border:1px solid rgba(236,228,218,.8);background:#fff;border-radius:18px;padding:.9rem;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s;min-height:7.5rem}
.tile:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(80,60,40,.12)}
.tile .ic{font-size:1.5rem;width:2.6rem;height:2.6rem;display:flex;align-items:center;justify-content:center;border-radius:14px;background:var(--teal-s)}
.tile:nth-child(even) .ic{background:var(--coral-s)}
.tile b{font-size:1rem}.tile span:last-child{font-size:.82rem;color:var(--muted);line-height:1.35}
@media(max-width:560px){.top{padding:.5rem .7rem}.brand>.site-name{display:none}.tabs button{padding:.4rem .7rem;font-size:.86rem}main{padding:.75rem}.card{padding:.9rem;border-radius:18px}.tiles{grid-template-columns:1fr 1fr}.hero{padding:1.1rem}.hero h1{font-size:1.35rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}


/* ---- v5 polish: clearer audio controls, nav, 360 / 1440 ---- */
.skip{position:absolute;left:-999px;top:0;z-index:100;background:var(--acc);color:#fff;padding:.6rem 1rem;border-radius:0 0 10px 0;font-weight:700}
.skip:focus,.skip:focus-visible{left:0;outline:3px solid var(--coral);outline-offset:2px}
.audio{display:inline-flex;gap:.4rem;flex-wrap:wrap;align-items:center;vertical-align:middle;margin:.15rem 0}
.audio .btn,.btn.ab-listen,.btn.ab-slow,.btn.ab-mic{
  min-height:44px;min-width:44px;padding:.4rem .85rem;font-weight:600;font-size:.88rem;
  gap:.35rem;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;
}
.btn.ab-listen{background:var(--teal-s);border-color:#9fd3cc;color:#0b5f59}
.btn.ab-listen:hover{background:#d4efe9}
.btn.ab-slow{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.ab-mic{background:var(--coral-s);border-color:#f5b3a6;color:var(--coral-d)}
.btn.ab-listen.playing,.btn.ab-slow.playing,button.playing[data-tts]{
  background:var(--acc);color:#fff;border-color:var(--acc);
  box-shadow:0 0 0 3px rgba(15,118,110,.28);
}
.ab-l{font-weight:600;line-height:1;white-space:nowrap}
.vcard .head{flex-direction:column;align-items:flex-start;justify-content:flex-start;gap:.45rem}
.vcard .audio{flex:0 0 auto;margin-top:.05rem}
.vcard .zh.lg{line-height:2.2}
.morph-row{display:flex;justify-content:space-between;align-items:center;gap:.5rem;border-bottom:1px solid var(--line);padding:.35rem 0;flex-wrap:wrap}
/* tab bar: fade only over a clipped tab, never a fully visible button */
.tabs-wrap{position:sticky;top:0;z-index:19}
.tabs-wrap::before,.tabs-wrap::after{
  content:"";position:absolute;top:0;bottom:0;width:0;pointer-events:none;z-index:2;
  opacity:0;
}
.tabs-wrap::before{left:0;width:var(--tab-fade-l,0px);background:linear-gradient(to left,transparent,rgba(251,247,242,.95) 70%)}
.tabs-wrap::after{right:0;width:var(--tab-fade-r,0px);background:linear-gradient(to right,transparent,rgba(251,247,242,.95) 70%)}
.tabs-wrap.fade-left::before,.tabs-wrap.fade-right::after{opacity:1}
.tabs button{scroll-margin-inline:1rem}
/* readable type, no accidental overflow */
html,body{overflow-x:clip;max-width:100%}
body{line-height:1.55;-webkit-font-smoothing:antialiased}
.zh{text-wrap:pretty}
h1,h2{text-wrap:balance}
input[type=search]{font-size:16px} /* prevent iOS zoom */
.hint{display:inline-flex;align-items:center;gap:.25rem;flex-wrap:wrap;margin:.15rem .1rem}
/* 360px phones */
@media(max-width:400px){
  .credit-top{font-size:.68rem;padding:.3rem .6rem;line-height:1.35}
  .top{padding:.45rem .6rem;gap:.35rem}
  .toggles{gap:.3rem}
  .seg button{padding:.3rem .55rem;font-size:.8rem;min-height:36px}
  .tabs{padding:.4rem .45rem;gap:.25rem}
  .tabs button{padding:.35rem .65rem;font-size:.8rem;min-height:40px;gap:.2rem}
  .tabs .ti{font-size:.95rem}
  main{padding:.7rem .65rem 1.4rem}
  .hero{padding:1rem .9rem;border-radius:20px}
  .hero h1{font-size:1.28rem;line-height:1.3}
  .hero p{font-size:.98rem}
  .tiles{grid-template-columns:1fr 1fr;gap:.5rem}
  .tile{min-height:6.6rem;padding:.7rem;border-radius:16px}
  .tile b{font-size:.95rem}
  .zh.xl{font-size:2.3rem}
  .zh.lg{font-size:1.85rem;line-height:2.2}
  .vgrid{gap:.55rem}
  .card{padding:.85rem .8rem}
  .audio .btn,.btn.ab-listen,.btn.ab-slow,.btn.ab-mic{padding:.35rem .65rem;font-size:.82rem}
  .vtable{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
}
/* mid phones already covered; keep tiles readable */
@media(max-width:560px){
  .brand>.site-name{max-width:42vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}
/* desktop 1440 */
@media(min-width:1440px){
  main{max-width:1080px;padding:1.6rem 1.4rem 2.4rem}
  .top{max-width:1080px;padding:.8rem 1.4rem}
  .tabs{padding:.55rem max(.8rem,calc((100% - 1080px)/2))}
  .hero{padding:2.4rem 2.2rem;margin-bottom:1.4rem}
  .hero h1{font-size:2.15rem}
  .zh.lg{font-size:2.45rem}
  .tiles{grid-template-columns:repeat(3,1fr);gap:1rem}
  .tile{min-height:8rem;padding:1.1rem}
  .vgrid{gap:1rem}
  .card{padding:1.25rem 1.35rem}
  .foot{padding:2rem 1.4rem 2.6rem}
}
@media(prefers-reduced-motion:reduce){
  .btn.ab-listen.playing,.btn.ab-slow.playing{box-shadow:0 0 0 3px rgba(15,118,110,.28)}
}

/* 中文 mode + 3-way language switcher */
#langSeg button[data-lang="zh"],#siLang button[data-lang="zh"]{font-family:var(--zh);font-weight:600;letter-spacing:.04em}
@media(max-width:400px){
  #langSeg button{padding:.3rem .48rem;font-size:.78rem}
  #siLang{flex-wrap:wrap}
}