:root{--ink:#172033;--muted:#718096;--line:#e3e8f0;--blue:#3568e8;--soft:#edf2ff;--green:#23a36b}*{box-sizing:border-box}body{margin:0;background:#f6f8fb;color:var(--ink);font:13px Inter,"PingFang SC","Microsoft YaHei",sans-serif;display:flex;min-height:100vh}aside{width:238px;background:#fff;border-right:1px solid var(--line);padding:26px 16px;display:flex;flex-direction:column}.logo{font-weight:800;font-size:18px;margin:0 11px 42px}.logo small{display:block;color:#98a3b5;font-size:9px;letter-spacing:1px;margin-top:5px}.project{padding:0 11px 25px;border-bottom:1px solid var(--line)}.project small{display:block;color:#9aa5b6;font-size:10px;margin-bottom:7px}.project b{font-size:12px}nav{display:grid;gap:5px;padding-top:20px}nav button{border:0;background:none;text-align:left;padding:12px;color:#66748b;border-radius:7px;cursor:pointer}nav button.active{background:var(--soft);color:var(--blue);font-weight:700}.aside-foot{margin-top:auto;border-top:1px solid var(--line);padding:16px 10px;color:var(--green);font-size:11px;line-height:2}.aside-foot span{color:#a0aabd}main{flex:1;min-width:0}header{height:84px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 38px}header small{color:#9ba6b7;font-size:11px}h1{font-size:22px;margin:5px 0}.header-actions button{margin-left:10px}.ghost,.outline{background:#fff;border:1px solid var(--line);border-radius:6px;padding:10px 14px;color:#647188;cursor:pointer}.build{border:0;background:var(--blue);color:#fff;padding:11px 17px;border-radius:6px;font-weight:600;cursor:pointer}.workspace{display:grid;grid-template-columns:43% 57%;min-height:calc(100vh - 84px)}.preview-col{background:#eef1f6;border-right:1px solid var(--line);padding:28px 30px}.col-title{display:flex;justify-content:space-between;align-items:center}.col-title b{display:block;font-size:14px}.col-title small{display:block;color:var(--muted);font-size:11px;margin-top:4px}.device-tabs button{border:0;background:none;color:var(--muted);padding:7px 10px;cursor:pointer}.device-tabs .selected{background:#fff;border-radius:5px;color:var(--blue);font-weight:600}.phone{width:286px;height:570px;background:#fff;border:8px solid #222c3c;border-radius:34px;margin:28px auto 13px;position:relative;overflow:hidden;box-shadow:0 16px 35px #17203322}.notch{height:20px;width:100px;background:#222c3c;border-radius:0 0 14px 14px;position:absolute;top:0;left:calc(50% - 50px)}.phone-head{padding:34px 17px 14px;border-bottom:1px solid #edf0f4;display:flex;justify-content:space-between;font-size:13px}.chat{padding:18px 13px}.welcome{text-align:center;color:#536178;margin:12px 0 30px}.welcome .bot{margin:auto auto 11px;background:var(--soft);color:var(--blue);width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:20px}.welcome p{font-size:11px;line-height:1.5;color:#9aa5b6}.bubble{padding:10px 12px;border-radius:12px;font-size:11px;line-height:1.5;margin:11px 0;max-width:87%}.user{margin-left:auto;background:var(--blue);color:#fff;border-bottom-right-radius:3px}.bot-bubble{background:#f2f4f8;color:#4b5870;border-bottom-left-radius:3px}.composer{position:absolute;bottom:24px;left:13px;right:13px;border:1px solid var(--line);border-radius:18px;padding:9px 11px;color:#a6afbe;font-size:10px;display:flex;justify-content:space-between}.composer b{background:var(--blue);color:#fff;border-radius:50%;width:20px;height:20px;text-align:center;padding-top:3px}.home{position:absolute;bottom:7px;left:calc(50% - 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