:root{--ink:#193c4d;--muted:#60777c;--green:#287c70;--line:#d2e2d9;--cream:#fffdf6;--pale:#eaf3eb;--yellow:#fff1bc;--gold:#c99421;--soft:#f2f6f2;--shadow:0 8px 30px #274e3a08;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#f4f7f0;font-synthesis:none}*{box-sizing:border-box}body{margin:0;line-height:1.6}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,a.button{font:inherit;color:var(--ink);border:1px solid var(--line);border-radius:13px;background:#fffef9;padding:11px 18px;min-height:46px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background .15s,border .15s}button:hover,a.button:hover{background:var(--pale);border-color:var(--green)}button:disabled{opacity:.38;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid 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0;max-width:700px}.footer summary{cursor:pointer}.playerbar{position:fixed;bottom:0;left:0;right:0;z-index:50;background:#ffffffed;backdrop-filter:blur(8px);border-top:1px solid #b9d3c6;padding:11px max(18px,calc((100vw - 1120px)/2));display:flex;align-items:center;gap:18px;box-shadow:0 -5px 20px #1b3a2b06}.player-main{flex:1;min-width:0}.player-main p{font-size:12px;margin-bottom:5px;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.playerbar .controls{display:flex;gap:9px;align-items:center}.playerbar label{font-size:12px;white-space:nowrap}.playerbar input{accent-color:var(--green)}.playerbar button{font-size:13px;padding:10px 13px}.playererror{color:#9d4a25;white-space:normal!important}.completion{display:inline-block;font-size:13px;color:var(--green);margin-left:10px}.teacher-tip{padding:13px 16px;background:#fff2c9;border:1px solid #ebd897;border-radius:12px;font-size:14px;margin-bottom:20px}.classroom .hero{padding:22px 28px}.classroom .hero img{height:150px}.classroom 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35px)}dialog::backdrop{background:#173c4b66}dialog p{margin:15px 0}
@media(max-width:800px){.site-head{padding:17px 20px}.head-actions .download{display:none}.hero{padding:25px;grid-template-columns:1.3fr .7fr;gap:15px}.hero img{height:215px}.hero p{font-size:13px}.hero h1{font-size:39px}.hero .cn-title{font-size:19px}.lesson-nav{grid-template-columns:repeat(3,1fr);gap:7px}.lesson-nav button{min-height:63px}.video-grid{grid-template-columns:1fr}.steps{grid-template-columns:repeat(3,1fr);gap:10px}.step{padding:13px}.reader-body{gap:17px}.reader-art img{height:270px}.reader-line{padding:13px;gap:9px}.reader-line b{font-size:22px}.panel{padding:22px}.choices{gap:10px}.image-choice img{height:180px}.home-grid{grid-template-columns:1fr}.drill{grid-template-columns:.7fr 1fr}.drill img{height:260px}.playerbar{padding:10px 18px}.classroom .reader-line b{font-size:25px}}
@media(max-width:560px){.site-head{padding:14px 16px;align-items:center;gap:8px}.brand strong{font-size:11px}.brand small{font-size:10px}.brand-mark{width:34px;height:34px;font-size:18px}.head-actions a,.head-actions button{font-size:11px;padding:8px 10px;min-height:42px}.shell{padding:0 13px 170px}.hero{padding:23px 20px;grid-template-columns:1fr;gap:18px;border-radius:20px}.hero img{height:200px;grid-row:2}.hero .eyebrow{font-size:10px}.hero h1{font-size:38px;letter-spacing:-1px}.hero .cn-title{font-size:20px}.hero-actions button{font-size:13px;padding:10px 13px}.hero-actions{margin-top:17px}.lesson-nav{margin:15px 0 18px;gap:6px}.lesson-nav button{font-size:13px;padding:11px 5px;min-height:63px}.lesson-nav button small{font-size:9px}.panel{padding:19px 16px;border-radius:20px}.panel-title{display:block;margin-bottom:20px}.panel-title>.row{margin-top:14px}.panel-title h2{font-size:26px}.panel-title p{font-size:13px}.steps{grid-template-columns:1fr}.step{padding:13px 15px}.song-line{padding:15px 13px;gap:11px}.song-line b{font-size:21px}.num{width:28px;height:28px;font-size:14px}.reader-body{grid-template-columns:1fr}.reader-art img{height:265px}.reader-line b{font-size:23px}.speech{font-size:21px;min-height:60px}.reader-controls button{padding:10px 12px}.subtabs{gap:6px}.subtabs button{min-width:0;flex:1;font-size:13px;padding:10px 6px}.choices{grid-template-columns:1fr;gap:10px}.image-choice{display:grid;grid-template-columns:95px 1fr;text-align:left;justify-items:start;gap:13px;padding:9px}.image-choice img{height:110px;grid-row:1/3}.image-choice b{align-self:end;font-size:18px}.image-choice small{align-self:start}.situation{grid-template-columns:1fr;gap:15px}.situation img{height:230px}.answer-choices button{font-size:18px}.sequence-slots{grid-template-columns:repeat(2,1fr)}.sequence-options{gap:8px}.sequence-options button{flex:1 1 calc(50% - 8px);min-width:110px;font-size:14px}.drill{grid-template-columns:1fr}.drill img{height:230px}.timer{font-size:47px}.prompt-card{font-size:17px}.expanded{padding:17px 15px 165px}.expanded .panel-title{top:-17px;padding:12px 0}.expanded .reader-art img{height:290px}.playerbar{display:block;padding:8px 14px max(10px,env(safe-area-inset-bottom))}.playerbar .controls{position:absolute;right:13px;top:6px;gap:6px}.playerbar .controls label{font-size:10px}.playerbar .controls button{padding:4px 10px;min-height:30px;font-size:11px}.player-main p{max-width:calc(100% - 150px);font-size:11px;height:20px;margin-bottom:4px}.player-main .playererror{max-width:100%;height:auto}.player-main audio{height:36px}.classroom .hero{padding:22px}.classroom .hero h1{font-size:36px}.classroom .hero img{display:none}.classroom .panel{padding:18px}.classroom .reader-art img{height:265px}.classroom .reader-line b{font-size:24px}.classroom .choices .image-choice img{height:110px}.classroom .answer-choices button{font-size:19px}.classroom .lesson-nav button{font-size:13px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.lesson-nav{position:sticky;top:0;z-index:25;background:#f4f7f0;padding:8px 0;margin-top:14px}.panel{scroll-margin-top:95px}@media(max-width:800px){.panel{scroll-margin-top:160px}}

.audio-practice{margin:18px 0}.seq-thumb{width:86px;height:100px;object-fit:contain;display:block;margin:0 auto 10px}.lyric-details{margin:20px 0;padding:18px;background:#f6f5ea;border-radius:16px}#fullLyrics{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:20px}#fullLyrics p{line-height:1.9;margin-top:10px}@media(max-width:600px){#fullLyrics{grid-template-columns:1fr}.head-actions{gap:6px}.head-actions a{font-size:12px}}