:root{--navy:#102c54;--orange:#ff7a16;--blue:#1172b8;--line:#e2e8ed}*{box-sizing:border-box}body{margin:0;background:#edf6fd;color:var(--navy);font-family:"Microsoft YaHei","Segoe UI",Arial,sans-serif}main{max-width:1440px;margin:auto;padding:26px 38px}header{text-align:center}h1{font-size:clamp(25px,3.3vw,46px);margin:0;letter-spacing:1px}header p{margin:9px 0 20px;font-size:15px;color:#637a94}button{font:inherit;cursor:pointer;border:0;transition:background .15s,transform .15s}button:hover:not(:disabled){filter:brightness(.96);transform:translateY(-1px)}button:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #1581ca;outline-offset:4px}button:disabled{cursor:default;opacity:.48}nav{display:flex;justify-content:center;align-items:center;gap:15px;margin:22px 0 26px}nav>span{width:68px;height:2px;background:#c5d7e7}.step{background:transparent;color:#72869c;padding:9px 18px;border-radius:30px;font-weight:700}.step.active{background:#fff0e0;color:#b24c0a;box-shadow:inset 0 0 0 1px #f4c18d}.classroom{display:grid;grid-template-columns:52% 48%;border:6px solid #20334f;border-radius:14px;overflow:hidden;background:#fffaf3;min-height:520px;box-shadow:0 12px 30px #163b5f09}.scene{position:relative;overflow:hidden;min-height:510px;background:#9bd5ed}.scene>img{position:absolute;width:auto;height:123%;max-width:none;top:-20.6%;left:-32.6%;aspect-ratio:1.5}.scene-caption{position:absolute;bottom:0;left:0;right:0;padding:50px 28px 25px;background:linear-gradient(transparent,#08213bbd);color:white;display:flex;flex-direction:column;gap:6px}.scene-caption span{font-size:13px;letter-spacing:3px}.scene-caption b{font-size:24px}.workspace{padding:24px;display:flex;flex-direction:column;gap:17px}.question,.qa{border:1px solid #e8e3da;border-radius:16px;background:#fffffc;padding:19px;box-shadow:0 2px 6px #4a391004}.question h2{font-size:clamp(18px,1.65vw,25px);line-height:1.4;margin:0 0 7px}.question p{font-size:clamp(17px,1.55vw,23px);font-weight:600;margin:0;line-height:1.5}.question strong{color:var(--blue)}.qa{flex:1}.qa>h2{font-size:22px;margin:0 0 13px;display:flex;justify-content:space-between;align-items:center}.qa small{font-size:12px;font-weight:500;color:#98734a;background:#fbf1e3;padding:4px 8px;border-radius:4px}.students{display:flex;gap:9px;padding-bottom:16px;border-bottom:1px solid var(--line)}.students button{flex:1;padding:11px 4px;background:#eaf0f4;color:#506075;border:2px solid transparent;border-radius:10px;font-size:15px}.students button.selected{background:#fff0dc;border-color:#e78a32;color:#b35318;font-weight:700}.recorder{display:flex;align-items:center;justify-content:center;gap:25px;padding:20px 0 10px}.mic{display:grid;place-items:center;color:#e97820;background:#fff0df;width:78px;height:88px;border-radius:50%}.mic 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span{font-size:11px;font-weight:400;color:#778797}textarea{width:100%;border:1px solid #d8e2e9;border-radius:8px;background:#f8fbfe;resize:vertical;min-height:64px;padding:10px;color:var(--navy);font:15px/1.5 "Segoe UI",sans-serif}.actions{display:flex;justify-content:space-between;gap:12px;margin-top:13px}.actions button{font-size:13px}.score-heading{display:flex;justify-content:space-between;align-items:center;margin:17px 0 8px}.score-heading h3{font-size:17px;margin:0}.score-heading>div{font-size:22px;font-weight:700;white-space:nowrap}.score-heading b{font-size:30px;color:var(--blue)}.criterion{display:flex;gap:12px;align-items:center;background:#f4f9fc;padding:11px 9px;margin:3px 0;border-radius:5px;font:15px "Segoe UI",sans-serif}.criterion .check{width:23px;height:23px;border-radius:50%;background:#21b875;color:white;text-align:center;line-height:23px}.criterion 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0;border-top:1px solid #e1e9ee;font-size:13px}.history-item p{color:#697f93;margin:6px 0}.history-item b{float:right}#historyList{max-height:50vh;overflow:auto;margin-bottom:20px}[hidden]{display:none!important}@media(min-width:1150px){.scene>img{height:auto;width:228%;top:-20.6%;left:-32.6%}.scene{min-height:565px}}@media(max-width:900px){main{padding:20px}.classroom{grid-template-columns:45% 55%;border-width:4px}.workspace{padding:15px}.scene>img{height:120%;left:-70%;top:-18%}.question,.qa{padding:14px}.students button{font-size:13px}.actions{gap:6px}.actions button{padding:10px}}@media(max-width:650px){main{padding:20px 12px}header p{font-size:13px}nav{margin:16px 0}.step{font-size:13px;padding:8px 12px}nav>span{width:25px}.classroom{grid-template-columns:1fr}.scene{min-height:0;height:260px}.scene>img{height:auto;width:228%;top:-20.6%;left:-32.6%}.scene-caption{padding:40px 18px 15px}.scene-caption b{font-size:18px}.workspace{padding:14px}.question h2{font-size:19px}.question p{font-size:18px}footer{flex-direction:column;gap:9px;text-align:center}.recorder{padding-top:18px}.qa>h2{font-size:20px}}
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.recognition-settings{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:14px;font-size:13px;font-weight:700}.recognition-settings select{border:1px solid #bfd2df;background:#f2f8fc;color:#214b72;border-radius:7px;padding:8px;font:inherit;max-width:75%}.service-status{font-size:12px;line-height:1.6;color:#50718d;margin:8px 0}.privacy-note{font-size:11px;line-height:1.7;color:#7d8993;margin:6px 0}.recording-tools audio{width:100%;height:36px}.recording-tools .actions{margin:10px 0 14px}.recording-tools a{font-size:12px;text-decoration:none;display:inline-block}.notice{white-space:normal;overflow-wrap:anywhere}.classroom{align-items:stretch}.scene{min-height:565px}@media(max-width:1000px){.scene{min-height:0}}