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*{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}
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a{color:var(--acc2)}
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.brand .zh{font-size:1.1rem}
.toggles{display:flex;gap:.4rem;align-items:center;flex-wrap:wrap}
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h2{font-size:1.15rem;margin:1rem 0 .5rem}
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rt{font-family:system-ui,sans-serif;font-size:.5em;color:var(--acc2);letter-spacing:0;line-height:1.1}
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.btn.mic{border-color:#fca5a5}
.btn.small{min-height:34px;padding:.25rem .6rem;font-size:.82rem}
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@media(min-width:700px){.vgrid{grid-template-columns:1fr 1fr}}
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.flash .back{margin-top:.6rem}
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.qopt.wrong{border-color:var(--bad);background:#fef2f2}.qopt.wrong .let{background:var(--bad);color:#fff}
.qopt[disabled]{cursor:default}
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.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}
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.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)}
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.split>div{border:1px solid var(--line);border-radius:12px;padding:.5rem .6rem}
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.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}
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.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}
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.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}
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.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}