:root{color-scheme:light;--ink:#153e57;--muted:#5e7180;--paper:#f3f7fa;--surface:#fff;--line:#d8e3eb;--accent:#126d78;--error:#ad243c;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink);padding:10px 16px;min-height:44px;transition:background .15s,border-color .15s}button:hover{background:#e7eff4;border-color:#9bb4c4}button:disabled{cursor:wait;opacity:.5}:focus-visible{outline:3px solid #3398b5;outline-offset:3px}[hidden]{display:none!important}header{height:86px;max-width:1280px;margin:auto;padding:0 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink);font-weight:750;letter-spacing:.04em}.mark{display:grid;place-items:center;width:36px;height:40px;background:var(--ink);color:white;border-radius:12px 12px 12px 2px;font:italic 30px Georgia,serif}.brand small{margin-left:14px;font-weight:400;letter-spacing:0;color:var(--muted)}.actions{display:flex;align-items:center;gap:10px}.privacy{font-size:12px;color:var(--accent);margin-right:12px}.privacy:before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-right:7px}main{max-width:1000px;margin:auto;padding:0 40px}.login-panel{max-width:760px;margin:110px 0 0 28px}.eyebrow{font:12px "Cascadia Code",Consolas,monospace;letter-spacing:.17em;color:var(--accent);margin-bottom:26px}h1{font-family:"Songti SC","Noto Serif CJK SC","Microsoft YaHei",serif;font-weight:550;font-size:clamp(30px,4vw,48px);line-height:1.5;letter-spacing:.01em;margin:0 0 20px}h1 span{color:var(--muted)}.login-panel>p,#welcome>p{color:var(--muted);font-size:15px;line-height:1.9}.login-panel form{margin:44px 0 26px;max-width:520px}.login-panel label{display:block;font-size:13px;margin-bottom:10px}.password-row{display:flex;gap:10px}input[type=password]{width:100%;min-width:0;padding:14px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink)}.password-row button,#send{background:var(--ink);color:white;border-color:var(--ink);white-space:nowrap}.password-row button:hover,#send:hover{background:#24556e}.model-note{font:12px "Cascadia Code",Consolas,monospace;color:var(--muted);display:flex;align-items:center;gap:9px}.dot{width:6px;height:6px;background:var(--accent);border-radius:50%}#workspace{height:calc(100dvh - 86px);display:flex;flex-direction:column}.modelbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:24px 0;border-bottom:1px solid var(--line)}.modelbar strong{font-size:14px}.modelbar div>span{display:block;margin-top:5px;font:11px Consolas,monospace;color:var(--muted)}#status{font-size:12px;color:var(--accent)}#messages{overflow:auto;flex:1;min-height:160px;padding:28px 0;scrollbar-width:thin;overflow-wrap:anywhere}#welcome{padding:44px 0}.suggestions{display:flex;gap:12px;margin-top:30px}.suggestions button{width:230px;text-align:left;font-size:13px;display:flex;justify-content:space-between}.message{margin-bottom:28px}.message-head{font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.06em;margin-bottom:10px}.message-content{white-space:pre-wrap;line-height:1.85;font-size:15px}.message.user{background:#e5eef4;padding:18px 22px;border-radius:12px;margin-left:12%}.message.assistant{padding:4px 8px}.message.assistant .message-head{color:var(--accent)}.message details{color:var(--muted);font-size:13px;margin:0 0 14px}.message summary{cursor:pointer;min-height:32px}.message details pre{font:inherit;white-space:pre-wrap;line-height:1.7}#chat-form{padding:15px;background:var(--surface);border:1px solid #b5cbd9;border-radius:14px;box-shadow:0 6px 24px #153e5705}textarea{display:block;resize:vertical;width:100%;max-height:200px;min-height:72px;border:0;background:transparent;color:var(--ink);padding:4px;line-height:1.65}textarea:focus-visible{outline-offset:0;border-radius:4px}.composer-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px}.composer-footer>div{display:flex;gap:8px}.thinking{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:5px;cursor:pointer;min-height:44px}.thinking input{accent-color:var(--accent);width:16px;height:16px}footer{text-align:center;color:var(--muted);font-size:11px;padding:13px 0 18px;line-height:1.7}#chat-error,#login-error{color:var(--error);font-size:13px;min-height:0;line-height:1.6}#chat-error:empty,#login-error:empty{display:none}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}@media(max-width:640px){header{height:70px;padding:0 20px}.brand small{display:none}.actions{gap:6px}.actions button{font-size:12px;padding:8px 10px}.privacy{margin-right:4px;font-size:11px}main{padding:0 20px}.login-panel{margin:70px 0 0}.login-panel form{margin-top:30px}.password-row{flex-direction:column}.password-row button{align-self:flex-start}.model-note{font-size:10px}#workspace{height:calc(100dvh - 70px)}.modelbar{padding:18px 0}.modelbar strong{font-size:13px}#welcome{padding:30px 0}.suggestions{flex-direction:column}.suggestions button{width:100%}.message.user{margin-left:5%;padding:14px 16px}footer{font-size:10px}.eyebrow{font-size:10px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}