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:root{--red:#f32e30;--ink:#28221d;--muted:#7e756b;--line:#e4dfd7;--bug-width:300px}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#fffefa;font:18px Wen,'KaiTi',sans-serif}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;border:1.5px solid var(--line);border-radius:13px;padding:10px 17px;background:#fff;font-weight:700}button:hover:not(:disabled){border-color:var(--red)}button:disabled{cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:4px solid #b91b27;outline-offset:4px}.primary{color:#fff;background:var(--red);border-color:var(--red);box-shadow:0 4px 0 #d61d25}.primary:disabled{opacity:.5;box-shadow:none}[hidden]{display:none!important}.app{height:100svh;min-height:620px;max-width:1720px;padding:18px 30px 10px;margin:auto;display:flex;flex-direction:column;gap:8px}header{display:flex;align-items:center;gap:20px;flex-wrap:wrap}h1{margin:0;font-size:clamp(34px,3.2vw,49px);font-weight:900;line-height:1.2;letter-spacing:-2px;white-space:nowrap}.brush{width:65%;height:6px;background:var(--red);border-radius:50%;transform:rotate(-3deg);margin:5px 0}.tabs{display:flex;gap:8px;flex:1}.tabs button{font-size:20px;white-space:nowrap;padding:12px 19px}.tabs button[aria-pressed=true]{background:var(--red);border-color:var(--red);color:#fff}.tools{display:flex;gap:7px}.tools button{font-size:16px;padding:10px 13px}.question{text-align:center;padding:6px 0;flex:none}.question h2{margin:0;font-size:clamp(27px,3vw,43px);line-height:1.35}.question p{margin:5px 0 0;color:var(--muted);font-size:20px}.arena{position:relative;overflow:hidden;flex:1;min-height:200px;display:flex;align-items:center;justify-content:space-evenly;gap:8px;isolation:isolate}.arena:before{content:'';position:absolute;bottom:0;left:0;right:0;height:25%;background:#fff0ab;border-radius:50% 45% 15% 10%;z-index:-1}.bug{position:relative;width:var(--bug-width);aspect-ratio:4/5;flex:none;background:none;border:0;padding:0;isolation:isolate;transition:transform .2s}.bug:hover:not(:disabled){transform:translateY(-5px)}.bug:focus-visible{outline-offset:-6px;border-radius:40%}.bug-art{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;pointer-events:none;user-select:none}.bug-number{position:absolute;left:1%;top:20%;min-width:37px;line-height:37px;border-radius:50%;background:#ffddd8;color:#b82127;font:700 24px Andika,sans-serif;z-index:3}.bug-word{position:absolute;left:13%;width:74%;top:58%;height:24%;display:flex;align-items:center;justify-content:center;font-family:Andika,Wen,sans-serif;font-weight:700;font-size:72px;line-height:1.5;white-space:nowrap;pointer-events:none}.net{position:absolute;left:0;top:1%;width:110%;height:105%;object-fit:contain;opacity:0;pointer-events:none;z-index:4;transform:translate(30%,-65%) rotate(20deg)}.bug.caught .net{animation:catchNet .75s ease-out both}.bug.solved .net{animation:none;opacity:.17;transform:none}.bug.caught .bug-art{filter:saturate(.9)}.bug.caught:after{content:'抓到啦！';position:absolute;top:14%;right:-1%;padding:6px 12px;border-radius:99px;background:var(--red);color:#fff;font-size:20px;z-index:5;transform:rotate(8deg)}.bug.wrong{animation:wiggle .42s ease-in-out}.bug.wrong .bug-word{color:#b74e29}.bug:disabled{opacity:1}.bug.passed{opacity:.66}.instruction{min-height:62px;display:flex;align-items:center;justify-content:center;gap:20px;text-align:center;padding:8px 18px;flex:none;border-radius:19px}.instruction.success{background:#fff1df}.idle-note{font-size:21px;color:var(--muted)}.fix{font-family:Andika,Wen,sans-serif;font-size:clamp(27px,3vw,42px);font-weight:700;white-space:nowrap}.old{text-decoration:line-through;color:#9d8278;margin-right:13px}.arrow{font-size:24px;color:#998779;margin-right:13px}.correct{color:#ba2227}.explain{font-size:20px;line-height:1.5;max-width:680px}.stats{display:flex;align-items:center;gap:25px;background:#fff;border:1.5px solid var(--line);border-radius:17px;padding:9px 20px;flex:none}.stats .count{font-size:23px;white-space:nowrap}.stats strong{color:var(--red);font-family:Andika,sans-serif;font-size:30px;margin:0 5px}.divider{width:1px;height:28px;background:var(--line)}.grow{flex:1}.stats button{min-width:120px;font-size:20px}.stats .plain{font-size:17px;min-width:auto;background:transparent;border:0}footer{display:flex;justify-content:space-between;font-size:14px;color:var(--muted);gap:12px;align-items:center;flex:none}footer button{font-weight:400;background:none;border:0;padding:4px;font-size:14px}.kbd-hint{flex:1;text-align:center}dialog{border:0;border-radius:24px;background:#fffdf8;color:var(--ink);padding:26px;width:min(710px,calc(100vw - 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@media(max-width:560px){.topic-picker{align-items:flex-start;gap:7px;padding-top:10px}.topic-label{padding-top:6px}.topic-choices{justify-content:flex-start;gap:5px}.topic-choices button{font-size:14px;padding:6px 9px}.topic-scope{font-size:15px;padding-top:5px}.tabs button{padding:9px 8px!important;font-size:15px!important}}
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@media(prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition:none!important}}
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