:root{--ink:#172a36;--muted:#647781;--line:#e2e9e9;--surface:#f6f9f8;--primary:#147c70;--primary-hover:#0c655b;--pale:#edf6f3;--warn:#795918;--warn-bg:#fff8e8;--radius:16px;font-family:Inter,"Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#f5f8f7;font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea{outline-offset:4px}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.52}a{color:inherit;text-decoration:none}[hidden]{display:none!important}.muted{color:var(--muted);font-size:13px}.eyebrow,.section-label{font-size:12px;font-weight:650;letter-spacing:1.2px;color:var(--primary)}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:17px;letter-spacing:.4px}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--primary);color:white;font-size:20px}.button{border:1px solid transparent;border-radius:10px;padding:11px 17px;font-size:14px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:12px;line-height:1.4;transition:background .15s}.primary{color:white;background:var(--primary)}.primary:hover:not(:disabled){background:var(--primary-hover)}.secondary{background:#fff;border-color:var(--line)}.secondary:hover:not(:disabled){background:var(--surface)}.full{width:100%}.loading{display:grid;place-items:center;min-height:100vh;color:var(--muted)}
.login-layout{min-height:100vh;display:grid;grid-template-columns:1fr 1fr;max-width:1440px;margin:auto}.welcome{padding:44px 64px 30px;display:flex;flex-direction:column;min-height:100vh;background:radial-gradient(ellipse at 5% 100%,#d8ece4 0%,transparent 58%)}.welcome-main{margin:auto 0;padding:64px 0}.welcome h1{font-size:clamp(36px,4vw,55px);line-height:1.35;letter-spacing:-1.5px;margin:20px 0}.intro{line-height:1.95;color:var(--muted);font-size:15px}.flow{margin-top:44px;display:grid;gap:20px}.flow>div{display:flex;align-items:center;gap:16px}.flow>div>span{width:36px;height:36px;border:1px solid #cbded7;display:grid;place-items:center;font-size:12px;font-weight:700;border-radius:50%;color:var(--primary)}.flow p{margin:0;display:grid;gap:4px}.flow strong{font-size:14px}.flow small{color:var(--muted);font-size:12px}.welcome-foot{color:var(--muted);font-size:12px;margin:0}.login-column{display:flex;align-items:center;justify-content:center;padding:42px}.login-card{max-width:430px;width:100%;padding:34px;border:1px solid var(--line);border-radius:22px;background:white;box-shadow:0 18px 60px rgba(36,64,54,.045)}.login-card h2{font-size:28px;margin:12px 0 6px}.login-card>.muted{margin:0 0 24px}.field-label{font-size:14px;font-weight:600;display:block;margin:17px 0 8px}.login-card input[type=text]{width:100%;height:46px;border:1px solid #d5dfde;padding:0 13px;border-radius:9px;background:#fcfdfd;color:var(--ink)}input::placeholder,textarea::placeholder{color:#97a4a9}.login-card input[type=text]:focus,textarea:focus{outline:2px solid #9bc8be;border-color:var(--primary)}.privacy-box{background:var(--surface);padding:13px 14px;margin-top:22px;border-radius:10px;font-size:11px;line-height:1.8;color:var(--muted)}.privacy-box strong{font-size:12px;color:var(--ink)}.privacy-box p{margin:5px 0 0}.consent-label{display:flex;align-items:flex-start;gap:9px;font-size:12px;margin:15px 0 21px;line-height:1.6;color:var(--muted)}.consent-label input{accent-color:var(--primary);margin:3px 0 0;width:15px;height:15px;flex-shrink:0}.footnote{font-size:11px;text-align:center;color:var(--muted);line-height:1.6;margin:16px 0 0}.notice{padding:11px 14px;border-radius:10px;border:1px solid #eddbac;background:var(--warn-bg);color:var(--warn);font-size:12px;line-height:1.7}.error{padding:11px 14px;background:#fff1ef;border:1px solid #f2d3cd;color:#a43b2a;border-radius:10px;font-size:13px;line-height:1.6;margin:12px 0}.chat-layout{height:100dvh;display:grid;grid-template-columns:260px minmax(0,1fr);max-width:1680px;margin:auto;background:white}.sidebar{padding:28px 22px;background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;gap:25px;overflow-y:auto}.sidebar .brand{font-size:15px;gap:10px}.sidebar .brand-mark{width:34px;height:34px;font-size:17px;border-radius:10px}.person-card,.session-card{display:flex;flex-direction:column;gap:8px}.person-card{padding:16px;background:white;border:1px solid var(--line);border-radius:12px;overflow-wrap:anywhere}.person-card>strong{font-size:18px}.section-label{font-size:10px;color:var(--muted)}.session-card>strong{font-size:13px;overflow-wrap:anywhere;line-height:1.6}.mono{font:10px ui-monospace,SFMono-Regular,Consolas,monospace;color:#819198}.save-card{display:flex;gap:9px;align-items:flex-start}.save-dot{width:7px;height:7px;border-radius:50%;background:var(--primary);margin-top:6px;flex-shrink:0}.save-card strong{font-size:12px;color:var(--primary)}.save-card p{font-size:11px;line-height:1.8;color:var(--muted);margin:6px 0 0}.downloads{display:grid;gap:10px}.downloads .button{justify-content:space-between;padding:10px 12px;font-size:12px}.sidebar-bottom{margin-top:auto;font-size:11px;color:var(--muted);line-height:1.8}.link-button{border:0;background:transparent;color:var(--primary);padding:0;font-size:12px;font-weight:600}.chat-main{display:flex;flex-direction:column;min-height:0;min-width:0}.chat-header{padding:23px 36px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:14px}.chat-header h2{margin:0;font-size:18px;display:flex;align-items:center;gap:10px}.chat-header p{margin:7px 0 0;font-size:11px;color:var(--muted);overflow-wrap:anywhere}.pill{background:var(--pale);color:var(--primary);font-size:10px;font-weight:500;padding:4px 8px;border-radius:6px;white-space:nowrap}.chat-header .button{font-size:12px;padding:10px 13px;flex-shrink:0}.chat-notice{margin:12px 28px 0}.messages{flex:1;overflow-y:auto;scroll-behavior:smooth;padding:32px max(28px,calc((100% - 830px)/2));min-height:160px;overscroll-behavior:contain}.empty-state{min-height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:36px 12px;color:var(--muted)}.empty-icon{background:var(--pale);color:var(--primary);border:1px solid #d8e8e2;border-radius:18px;width:58px;height:58px;display:grid;place-items:center;font-size:23px}.empty-state h3{color:var(--ink);font-size:23px;margin:22px 0 8px}.empty-state p{font-size:13px;line-height:1.85;margin:0}.message{display:flex;gap:11px;margin:0 0 28px;align-items:flex-start}.avatar{width:30px;height:30px;border-radius:10px;display:grid;place-items:center;flex-shrink:0;background:var(--pale);color:var(--primary);font-size:10px;font-weight:700}.message-content{max-width:90%;min-width:0}.message-meta{font-size:10px;color:var(--muted);margin:0 0 7px;line-height:1.5;display:flex;gap:10px}.message-body{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.9}.message.user{justify-content:flex-end}.message.user .avatar{display:none}.message.user .message-meta{justify-content:flex-end}.message.user .message-body{background:#f0f4f7;padding:12px 16px;border-radius:13px 3px 13px 13px}.message.problem .message-body{color:#936c26;font-size:12px;border:1px solid #eadfca;padding:11px 14px;border-radius:10px;background:#fffbf3}.message.pending .message-body{color:var(--muted);font-size:13px}.completed-panel{margin:0 28px 12px;padding:16px;border:1px solid #c9e4d9;background:var(--pale);border-radius:12px;display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--primary)}.completed-panel span{font-size:12px}.composer{border:1px solid #d7e1de;border-radius:15px;margin:0 max(28px,calc((100% - 830px)/2));background:white;box-shadow:0 4px 20px rgba(32,73,58,.03);padding:14px}.composer textarea{display:block;resize:vertical;width:100%;max-height:230px;min-height:70px;border:0;background:transparent;padding:0;color:var(--ink);font-size:14px;line-height:1.8;border-radius:4px}.composer textarea:focus{outline:0}.composer:focus-within{border-color:#7fb9ac;box-shadow:0 0 0 2px #eaf4f0}.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px;padding-top:9px}.composer-bottom>span{font-size:10px;color:#8b9b9f}.composer-bottom>div{display:flex;align-items:center;gap:15px}.composer-bottom .muted{font-size:10px}.composer .button{padding:8px 16px;font-size:12px}.model-disclaimer{text-align:center;color:#8a999e;font-size:10px;line-height:1.7;margin:11px 24px 16px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);z-index:20;background:#183f36;color:white;border-radius:11px;box-shadow:0 6px 24px #183f3622;padding:14px 22px;font-size:13px;max-width:90%;line-height:1.65}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(min-width:1500px){.chat-layout{border-left:1px solid var(--line);border-right:1px solid var(--line)}}
@media(max-width:900px){.welcome{padding:35px;}.login-column{padding:25px}.login-card{padding:26px}.welcome h1{font-size:39px}.chat-layout{grid-template-columns:220px minmax(0,1fr)}.sidebar{padding:24px 17px}.chat-header{padding:20px 24px}.chat-header h2{font-size:16px}}
@media(max-width:680px){.login-layout{display:flex;flex-direction:column}.welcome{min-height:unset;padding:24px 24px 0;background:none}.welcome-main{padding:30px 0 0}.welcome h1{font-size:32px;margin:12px 0 8px;letter-spacing:-.5px}.welcome h1 br{display:none}.welcome .intro{font-size:13px;margin:0}.flow,.welcome-foot,.welcome-main>.eyebrow{display:none}.login-column{padding:23px 20px 30px}.login-card{max-width:500px;padding:25px}.chat-layout{grid-template-columns:1fr;height:100dvh}.sidebar{display:grid;grid-template-columns:1fr auto;padding:12px 16px;gap:10px;border-right:0;border-bottom:1px solid var(--line);overflow:visible}.sidebar .brand{font-size:13px}.sidebar .brand-mark{width:27px;height:27px;border-radius:8px;font-size:15px}.person-card{display:flex;flex-direction:row;align-items:center;gap:6px;border:0;background:transparent;padding:0;margin:0;justify-self:end;max-width:220px}.person-card .section-label{display:none}.person-card>strong{font-size:12px;max-width:90px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.person-card .muted{font-size:10px}.session-card,.save-card,.sidebar-bottom p,.downloads>.section-label{display:none}.downloads{display:flex;gap:7px;grid-column:1}.downloads .button{padding:5px 8px;font-size:10px;gap:5px}.sidebar-bottom{margin:0;align-self:center;justify-self:end}.sidebar-bottom .link-button{font-size:11px}#new-chat{grid-column:1/-1;grid-row:3;padding:7px;font-size:11px}.chat-layout{grid-template-rows:auto minmax(0,1fr)}.chat-header{padding:15px 16px}.chat-header h2{font-size:15px;gap:7px}.chat-header .button{font-size:11px;padding:8px 10px}.messages{padding:23px 16px}.composer{margin:0 12px;padding:11px}.chat-notice{margin:10px 12px 0;font-size:11px}.completed-panel{margin:0 12px 12px;font-size:12px}.empty-state h3{font-size:20px}.empty-state p{font-size:12px}.message-body{font-size:14px}.composer-bottom>span{font-size:9px}.composer-bottom>div{gap:9px}.model-disclaimer{font-size:9px;margin:8px 14px 10px}.message-content{max-width:94%}}