:root{--bg:#f7f8fa;--ink:#182b3a;--muted:#7a858e;--line:#e5e9eb;--green:#267569;--pale:#eaf3ef}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;font-size:14px}button,input,select,textarea{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer;border:0;background:none;color:inherit}button:disabled{opacity:.5;cursor:wait}a{color:var(--green);text-decoration:none}header{max-width:1440px;margin:auto;padding:27px 5%;display:flex;align-items:center;gap:28px;border-bottom:1px solid var(--line)}.brand{color:var(--ink);font-size:23px;display:flex;align-items:center;gap:10px;white-space:nowrap}.brand small{font-size:9px;letter-spacing:2px;color:var(--muted);margin-left:10px}nav{display:flex;gap:13px;margin:auto}nav button{font-size:13px;padding:10px 14px;color:var(--muted);border-radius:20px}nav button.active{color:var(--green);background:var(--pale)}.status{font-size:11px;color:var(--green);white-space:nowrap}main{max-width:1370px;margin:auto;padding:0 4%}.hero{text-align:center;padding:49px 0 38px}.eyebrow{font-size:10px;letter-spacing:2px;color:var(--muted);font-weight:600}h1{font-size:43px;letter-spacing:-2px;margin:15px 0 17px;font-weight:600}h1 span{color:var(--green)}p{line-height:1.9}.hero p{color:var(--muted);font-size:14px}h2{font-size:21px;font-weight:600}h3{font-size:18px}.workspace{display:grid;grid-template-columns:245px minmax(300px,1fr) 235px;gap:20px;align-items:start}.panel{background:#fff;border:1px solid var(--line);border-radius:17px;padding:25px;box-shadow:0 5px 22px #172e3a03;margin-bottom:20px}label{display:block;font-size:12px;color:#64717a;margin:18px 0 10px}select,input{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px;background:#fff;color:var(--ink);margin-top:8px}.scenario{display:block;text-align:left;width:100%;padding:15px 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p{font-size:20px;line-height:1.6;margin:9px 0;font-weight:500}.text{color:var(--green);font-size:12px;padding:6px 0}.recording{display:flex;align-items:center;gap:13px;padding:16px 0}.mic{background:var(--green);border:5px solid #e3eeea;border-radius:50%;width:54px;height:54px;color:white;font-size:19px}.mic.live{background:#bd5353}.recording b{font-size:13px;font-weight:500}.recording small{display:block;font-size:10px;color:var(--muted);margin-top:7px}#timer{margin-left:auto;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}textarea{display:block;width:100%;min-height:92px;resize:vertical;border:1px solid var(--line);border-radius:10px;padding:15px;color:var(--ink);line-height:1.6;background:#fcfdfd}textarea::placeholder{color:#9aa3aa;font-size:12px}.actions,.bottom-actions{display:flex;justify-content:space-between;gap:12px;margin-top:15px}.primary,.secondary{padding:12px 18px;border-radius:8px;font-size:12px}.primary{background:var(--green);color:#fff}.secondary{background:#f4f6f7;border:1px solid var(--line)}.bottom-actions{border-top:1px solid var(--line);padding-top:14px;margin-top:24px}.plan{background:#edf3ef;border-color:#e0ebe3}.plan p{font-size:12px;color:#6e8379}.plan ol{padding-left:18px;margin-top:23px;line-height:2.8;font-size:12px;color:#537264}.mini strong{display:block;font-size:44px;margin:15px 0 3px;font-weight:400}.mini>span:last-of-type{font-size:11px;color:var(--muted)}.mini p{font-size:11px;border-top:1px solid var(--line);padding-top:15px;color:var(--muted)}.quote{padding:14px;font:italic 21px/1.6 Georgia;color:#8a9999}.quote small{display:block;font:10px "Microsoft YaHei";margin-top:16px}.hint,.feedback{padding:16px;background:#f1f6ed;border-radius:10px;font-size:12px;line-height:1.9;margin-top:15px}.bubble{padding:13px 16px;margin:8px 0;border-radius:12px;font-size:13px;line-height:1.7;white-space:pre-wrap}.bubble.user{background:#eaf3ef;margin-left:35px}.bubble.assistant{background:#f4f6f8;margin-right:20px}.bubble small{display:block;color:var(--muted);font-size:9px;margin-bottom:5px}#messages{max-height:340px;overflow:auto}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.cards .panel{margin-bottom:20px}.section-head{margin:5px 0 28px}.section-head h2{font-size:29px}.section-head p{color:var(--muted)}.upload{padding:14px;border:1px dashed #c5d7ce;border-radius:8px}.record-row{border-top:1px solid var(--line);padding:16px 0;white-space:pre-wrap;line-height:1.8}.record-row small{color:var(--muted)}.record-row button{margin:8px}.review-phrase{font-size:18px;color:var(--green)}audio{max-width:100%;width:100%;margin:10px 0}footer{display:flex;justify-content:space-between;max-width:1240px;margin:34px auto 0;padding:24px 15px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}footer small{font-size:10px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:12px 25px;border-radius:8px;display:none;max-width:90vw}.sr{position:absolute;width:1px;height:1px;overflow:hidden}button:focus-visible,a:focus-visible{outline:2px solid #5b9c88;outline-offset:3px}[hidden]{display:none!important}@media print{header,.hero,footer,button,#reflection,.upload,#toast{display:none!important}.view{display:none!important}#transfer{display:block!important}.cards{display:block}.panel{break-inside:avoid}}
:root .model-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.model-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;border:1px solid var(--line);border-radius:12px;padding:20px;gap:12px;background:#fbfcfc}.model-card.selected{border-color:var(--green);background:var(--pale)}.model-card code{font-size:12px;color:var(--green)}.model-card small{color:var(--muted);line-height:1.8}.model-card span{font-size:20px}progress{width:100%;height:12px;accent-color:var(--green)}

.account-links{display:flex;align-items:center;gap:8px;font-size:12px;flex-wrap:wrap}.account-links a{color:#2563eb}header{flex-wrap:wrap}

.video-entry{display:inline-flex;align-items:center;gap:14px;margin-top:18px;padding:12px 20px;border:1px solid #c6dfd7;border-radius:12px;background:#eaf4ef;color:var(--green);font-size:14px;font-weight:600}.video-entry span{font-size:12px;font-weight:400}.video-lesson{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(200px,1fr);gap:30px}.video-lesson video{width:100%;border-radius:12px;background:#101d26;display:block;margin:18px 0 10px}.video-steps{align-self:center}.video-steps li{margin-bottom:15px;color:var(--muted);line-height:1.8}nav{flex-wrap:wrap}