:root{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:#263d31;background:#f0f8f3;font-synthesis:none;--green:#287853;--line:#dce9df}
*{box-sizing:border-box}body{max-width:1180px;margin:0 auto;padding:25px 28px}h1,h2,p{margin:0}h1{text-align:center;color:#26724d;font-size:27px;line-height:1.5}button,a{-webkit-tap-highlight-color:transparent;touch-action:manipulation}button{font:inherit;cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible{outline:3px solid #e3ac47;outline-offset:4px}a{color:#647b6a;text-decoration:none}[hidden]{display:none!important}.description{text-align:center;color:#708074;font-size:14px;line-height:1.8;margin:8px 0 14px}.class-info{display:flex;justify-content:center;align-items:center;gap:16px;font-size:13px;color:#7a8a7d;min-height:33px;margin-bottom:20px;flex-wrap:wrap}.class-info #studentBadge{background:#e1f0e5;border-radius:8px;padding:7px 15px;color:#287853;font-size:17px;font-weight:650}.level-box{display:flex;justify-content:center;gap:12px;margin-bottom:20px}.level-btn{border:2px solid transparent;border-radius:12px;padding:16px 18px;font-size:16px;line-height:1.6;color:#fff;min-height:64px;flex:1;max-width:400px;transition:opacity .15s,box-shadow .15s}.level-btn:hover:not(:disabled){filter:brightness(1.04)}.l1{background:#4c83ce}.l2{background:#399669}.l3{background:#f1c65c;color:#574618}.level-btn:disabled{opacity:.47}.level-btn.active{box-shadow:0 0 0 3px #fff,0 0 0 5px #377253}.game-container{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;min-height:470px;box-shadow:0 5px 22px #325b3c06}.empty{min-height:410px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:15px;gap:18px}.empty h2{font-size:27px;color:#2c704e}.empty p{font-size:18px;color:#758678;line-height:1.8;max-width:630px}.empty .success{font-size:56px;color:#5b9858;line-height:1}.number-title{text-align:center;font-size:27px;color:#2c704e;margin:4px 0 10px}.number-hint{text-align:center;font-size:15px;color:#7b8c7f;margin-bottom:25px;line-height:1.8}.number-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:13px;max-width:800px;margin:0 auto;padding:5px 0 20px}.number-btn{padding:15px 10px;min-height:91px;background:#f7fbf7;border:2px solid #c9dfce;color:#2d7751;border-radius:12px;font-size:28px;font-weight:650;font-variant-numeric:tabular-nums}.number-btn:hover:not(:disabled){background:#e7f3e9;border-color:#4a9463}.number-btn small{display:block;font-size:11px;font-weight:400;margin-top:5px;letter-spacing:1px}.number-btn:disabled{background:#f0f1ef;border-color:#e5e8e2;color:#aab2a9}.number-btn:disabled small{color:#929f93}.question-title{font-size:23px;line-height:1.7;font-weight:650;color:#2c4335;min-height:43px;margin-bottom:12px}.question-title .target-word{font-size:32px;color:#2a7851;letter-spacing:3px}.question-reference{display:flex;gap:15px;justify-content:center;align-items:center;margin:14px 0 18px}.question-reference img{width:150px;height:112px;object-fit:contain;border:1px solid var(--line);padding:5px;border-radius:8px}.audio-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:10px 0 19px}.audio-btn,.ctrl-btn{border:0;border-radius:10px;padding:14px 24px;min-height:54px;font-size:18px;background:#e9f2eb;color:#2d7751}.hint-btn{border:0;background:none;color:#7b8c7d;text-decoration:underline;font-size:13px;padding:10px}.hint-word{font-size:22px;color:#387153;letter-spacing:3px}.voice-help{font-size:13px;color:#9b753e;line-height:1.8;margin-bottom:14px}.options{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:20px}.option{position:relative;border:2px solid #dbe9de;border-radius:13px;min-height:205px;padding:19px 13px 13px;display:flex;align-items:center;justify-content:center;gap:8px;background:#fbfefb;transition:border-color .15s,background .15s}.option:hover:not(:disabled){border-color:#6d9f78;background:#f0f8f1}.option img{width:100%;max-height:180px;object-fit:contain;border-radius:5px}.option .pair{display:flex;flex-direction:column;gap:10px;width:100%;align-items:center}.option .pair img{height:115px}.option .pair img+img{padding-top:9px;border-top:1px solid #e8efe7}.option-label{position:absolute;top:6px;left:9px;color:#9eaf9d;font-size:11px}.option.correct{border-color:#4e9c63;background:#eef8ed}.option.wrong{border-color:#d5b27c;background:#fffaf0}.answer-mark{position:absolute;top:5px;right:8px;color:#549655;font-size:20px}.option.wrong .answer-mark{color:#b58a44}.feedback{font-size:21px;font-weight:600;min-height:37px;line-height:1.7;margin:21px 0 0;color:#788c7a}.feedback.correct-text{color:#3b8a50}.feedback.retry-text{color:#ac813e}.control-row{display:flex;justify-content:center;gap:12px;margin-top:15px}.ctrl-btn{background:#4c83ce;color:#fff;min-width:150px}.ctrl-btn:disabled{background:#c3d4c8;color:#f5faf6}.small-button{background:#e9f2eb;color:#2d7751;border:1px solid #c5dacb;border-radius:10px;font-size:17px;padding:13px 24px}.sync-status{font-size:12px;color:#7d8d80;min-height:22px;margin:14px 0 0;text-align:center;line-height:1.8}.sync-status.warning{color:#a47d43}.inline-error{font-size:15px;color:#a0783f;text-align:center;min-height:25px;line-height:1.8;margin-top:8px}footer{display:flex;justify-content:space-between;margin:18px 3px 0;color:#94a092;font-size:12px;gap:15px}footer a{padding:4px 0}
@media(min-width:1500px){body{max-width:1320px;padding-top:40px}.game-container{min-height:530px}.option{min-height:240px}.option img{max-height:200px}.option .pair img{height:135px}.question-title{font-size:26px}}
@media(max-width:900px){body{padding:22px}.level-box{gap:10px}.level-btn{font-size:14px;padding:13px 12px}.game-container{padding:24px}.options{gap:12px}.option{padding:17px 9px 10px;min-height:178px}.option img{max-height:155px}.option .pair img{height:105px}.number-grid{gap:11px}.number-btn{min-height:83px}.question-title{font-size:21px}}
@media(max-width:620px){body{padding:19px 14px}h1{font-size:22px}.description{font-size:11px;margin:8px 6px 10px}.class-info{font-size:11px;gap:10px;margin-bottom:15px}.class-info #studentBadge{font-size:15px;padding:5px 12px}.level-box{flex-direction:column;gap:8px;margin-bottom:15px}.level-btn{max-width:none;min-height:49px;font-size:14px;padding:10px 9px;width:100%}.game-container{padding:20px 15px;min-height:390px}.empty{min-height:330px;padding:4px;gap:16px}.empty h2{font-size:23px}.empty p{font-size:15px}.number-title{font-size:24px}.number-hint{font-size:13px;margin-bottom:17px}.number-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.number-btn{min-height:76px;font-size:23px;padding:11px 5px}.number-btn small{font-size:10px}.question-title{font-size:19px;line-height:1.7;min-height:0}.question-title .target-word{font-size:27px}.options{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;margin-top:15px}.option{min-height:150px;padding:18px 9px 9px}.option img{max-height:133px}.option .pair{gap:5px}.option .pair img{height:95px}.question-reference img{height:87px;width:120px}.feedback{font-size:18px;margin-top:17px;min-height:30px}.ctrl-btn,.audio-btn{font-size:16px;padding:12px 20px;min-height:48px}.audio-row{gap:5px;margin-bottom:12px}.hint-btn{font-size:12px}.sync-status{font-size:11px}footer{font-size:10px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
@media(min-width:760px) and (max-height:850px) and (orientation:landscape){body{padding:16px 22px}h1{font-size:24px}.description{font-size:12px;margin:5px 0 8px}.class-info{min-height:26px;margin-bottom:13px}.class-info #studentBadge{font-size:15px;padding:5px 13px}.level-box{margin-bottom:16px}.level-btn{padding:10px 12px;min-height:62px;font-size:14px}.game-container{padding:20px;min-height:420px}.question-title{font-size:20px;line-height:1.5;min-height:30px;margin-bottom:8px}.question-title .target-word{font-size:27px}.question-reference{margin:8px 0 12px}.question-reference img{height:88px;width:120px}.options{margin-top:12px;gap:12px}.option{min-height:170px;padding:17px 10px 10px}.option img{max-height:140px}.option .pair img{height:90px}.feedback{font-size:18px;margin-top:14px;min-height:30px}.control-row{margin-top:10px}.ctrl-btn,.audio-btn{padding:11px 22px;min-height:48px;font-size:17px}.empty{min-height:375px}.number-btn{min-height:82px}.number-hint{margin-bottom:20px}.sync-status{margin-top:10px}footer{margin-top:10px}}