@charset "UTF-8";
:root{--ink:#142b43;--gold:#b48b4d;--muted:#667584;--line:#dce2e7;--paper:#f6f8fa}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);font:16px/1.75 "Segoe UI","Microsoft YaHei",sans-serif;background:#fff}button,a,textarea{ -webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button,a{transition:background .2s,color .2s,transform .2s}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid var(--gold);outline-offset:4px}button{border:0}header{height:92px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 5.5%;background:#ffffffed;position:sticky;top:0;z-index:10}.brand{display:flex;gap:8px;align-items:center;font-size:24px;font-weight:650;white-space:nowrap}.brand img{width:48px;height:48px}.brand b{font:25px Georgia,serif}nav{display:flex;gap:34px;font-size:15px}nav a:hover{color:var(--gold)}.quiet{padding:10px 16px;background:transparent;border:1px solid var(--line);border-radius:4px;font-size:14px}.hero{padding:90px 5.5% 85px;display:grid;grid-template-columns:1.25fr 1fr;gap:65px;align-items:center;max-width:1600px;margin:auto}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:600;color:var(--gold);margin:0 0 25px}h1{font-size:clamp(32px,3.5vw,55px);letter-spacing:-1.5px;line-height:1.5;font-weight:600;margin:0 0 25px}h1 span{color:var(--gold)}.intro{color:var(--muted);font-size:18px;line-height:1.9}.actions{display:flex;align-items:center;gap:22px;margin:32px 0 16px}.primary{background:var(--ink);color:white;padding:14px 24px;border-radius:4px;font-weight:500}.primary:hover{background:#284962;transform:translateY(-1px)}.primary span{margin-left:26px}.text-button{background:transparent;padding:10px 0;color:var(--ink);font-size:14px}.caption,small{font-size:12px;color:var(--muted)}.hero-demo{border:1px solid #d8dfe5;border-radius:14px;background:var(--paper);box-shadow:0 24px 65px #17364b0c;overflow:hidden;transform:rotate(-1deg)}.demo-top{display:flex;justify-content:space-between;padding:20px 24px;background:white;font-size:12px;border-bottom:1px solid var(--line);color:var(--muted)}.mini-brand{color:var(--ink);font-weight:650}.user-bubble{background:#e6edf2;margin:28px 24px 24px 65px;padding:14px 18px;border-radius:12px 12px 2px 12px;font-size:15px}.demo-answer{display:flex;gap:10px;padding:0 24px 20px;font-size:15px}.demo-answer img{width:32px;height:32px;margin-top:13px}.demo-answer p{margin:10px 0 15px}.evidence{border-left:2px solid var(--gold);padding-left:12px;font-size:12px;color:var(--muted)}.demo-input{margin:5px 22px 23px;padding:12px 16px;width:calc(100% - 44px);background:white;border:1px solid var(--line);text-align:left;color:var(--muted);border-radius:7px;font-size:14px}.demo-input span{float:right;color:var(--ink)}section.principles{border-top:1px solid var(--line);padding:75px 8%;display:grid;grid-template-columns:1fr 1fr;gap:60px;background:#fafbfc}h2{font-size:34px;font-weight:550;line-height:1.55;letter-spacing:-.7px;margin:0 0 18px}.section-heading>p:not(.eyebrow){color:var(--muted)}.principle-list article{display:flex;gap:30px;padding:22px 0;border-bottom:1px solid var(--line)}.principle-list article:first-child{padding-top:0}.principle-list article>span{color:var(--gold);font:19px Georgia;margin-top:5px}h3{font-size:19px;font-weight:600;margin:0 0 8px}.principle-list p{color:var(--muted);margin:0;font-size:15px}.knowledge{padding:80px 8%}.questions{display:grid;grid-template-columns:repeat(3,1fr);margin:35px 0 55px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.questions button{text-align:left;background:white;padding:32px 25px;border-right:1px solid var(--line)}.questions button:last-child{border:0}.questions button:hover{background:var(--paper)}.questions span{color:var(--muted);font-size:13px}.questions h3{margin:18px 0 30px;line-height:1.7}.questions b{font-size:13px;color:var(--gold);font-weight:500}.expert{display:grid;grid-template-columns:190px 1fr;gap:35px;max-width:1000px}.expert-monogram{font:70px Georgia,serif;border-left:3px solid var(--gold);padding-left:25px}.expert-monogram span{display:block;font:12px/2 "Microsoft YaHei";color:var(--muted);margin-top:15px}.expert p{font-size:15px;color:var(--muted);margin:8px 0}.engineering{margin:0 4%;padding:65px 5%;background:var(--ink);color:white;display:grid;grid-template-columns:1.15fr 1fr;gap:65px;border-radius:6px}.engineering p:not(.eyebrow){color:#bdcbd6;font-size:15px}.light-button{background:#fff;color:var(--ink);padding:12px 20px;margin-top:20px;border-radius:3px}.engineering-flow>div{padding:20px 0 20px 45px;border-bottom:1px solid #ffffff24;position:relative}.engineering-flow>div:last-child{border:0}.engineering-flow span{position:absolute;left:0;color:#d2b684}.engineering-flow p{margin:0}.join{text-align:center;padding:90px 20px}.join p:not(.eyebrow){color:var(--muted);margin-bottom:28px}footer{display:flex;justify-content:space-between;align-items:center;padding:25px 5.5%;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}footer .brand{font-size:18px}footer img{width:35px!important;height:35px!important}[hidden]{display:none!important}#workspace-view{display:grid;grid-template-columns:260px 1fr;height:calc(100dvh - 92px)}aside{background:var(--paper);border-right:1px solid var(--line);padding:26px 20px;display:flex;flex-direction:column}aside>.primary{font-size:14px}aside>.eyebrow{margin:32px 0 15px;font-size:12px;letter-spacing:1px}#history{overflow:auto}#history button{display:block;width:100%;padding:12px 10px;text-align:left;font-size:13px;background:transparent;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;border-radius:4px}#history button:hover{background:#e3eaf0}.aside-bottom{margin-top:auto;padding-top:25px}.aside-bottom p{font-size:14px;margin-bottom:0}.aside-bottom button{display:block}.chat-main{display:flex;flex-direction:column;min-height:0;max-width:1200px;width:100%;margin:auto;height:100%}.chat-top{display:flex;justify-content:space-between;padding:18px 30px;border-bottom:1px solid var(--line);font-size:14px}.demo-badge{font-size:12px;color:var(--muted)}#messages{overflow:auto;flex:1;padding:30px max(25px,7%)}.welcome{text-align:center;padding-top:35px}.welcome>img{width:80px;height:80px;margin-bottom:20px}.welcome .eyebrow{margin:0 0 15px}.welcome h2{font-size:29px}.welcome>p:not(.eyebrow){font-size:15px;color:var(--muted)}.prompt-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin:30px auto}.prompt-grid button{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:14px 18px;color:var(--ink);font-size:14px}.message{padding:18px 22px;border-radius:10px;margin:0 0 22px;white-space:pre-wrap;max-width:95%;font-size:15px}.message.user{background:#eaf0f5;margin-left:auto;max-width:85%;width:fit-content}.message.assistant{border:1px solid var(--line);background:#fff}.message.assistant strong{display:block;color:var(--gold);font-size:12px;margin-bottom:10px}.message button{display:block;font-size:12px;color:var(--muted);padding:8px 0;background:transparent}#chat-form{margin:12px max(25px,7%) 20px;position:relative}textarea{width:100%;resize:none;border:1px solid #b9c7d2;border-radius:10px;padding:16px 60px 16px 18px;min-height:100px;font:15px/1.6 inherit;font-family:inherit;color:var(--ink)}.send{position:absolute;right:14px;top:25px;width:35px;height:35px;border-radius:6px;background:var(--ink);color:white;font-size:22px}#chat-form small{display:block;text-align:center;font-size:12px}dialog{border:1px solid var(--line);padding:40px;max-width:540px;width:calc(100% - 40px);color:var(--ink);border-radius:12px;box-shadow:0 25px 100px #142b4333}dialog::backdrop{background:#142b4377}.close{position:absolute;right:15px;top:8px;background:transparent;font-size:28px;color:var(--muted)}dialog p{color:var(--muted);font-size:15px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:1000px){nav{gap:16px}.hero{gap:30px;padding:60px 5%}.hero h1{font-size:34px}.intro{font-size:16px}.questions h3{font-size:16px}.engineering{gap:25px}h2{font-size:29px}}@media(max-width:720px){header{height:72px;padding:0 5%}.brand{font-size:20px}.brand b{font-size:21px}.brand img{width:37px;height:37px}nav{display:none}.quiet{font-size:12px;padding:8px}.hero{grid-template-columns:1fr;padding:45px 6%;gap:35px}.hero h1{font-size:33px;letter-spacing:-1px}.eyebrow{font-size:11px;letter-spacing:1.5px}.actions{gap:16px}.primary{padding:12px 18px}.caption{font-size:11px}.hero-demo{transform:none}section.principles{grid-template-columns:1fr;padding:50px 6%;gap:25px}.knowledge{padding:50px 6%}.questions{grid-template-columns:1fr;margin-bottom:35px}.questions button{border-right:0;border-bottom:1px solid var(--line);padding:24px 12px}.questions h3{font-size:19px;margin:10px 0 15px}.questions h3 br{display:none}.expert{grid-template-columns:1fr;gap:20px}.expert-monogram{font-size:40px}.expert-monogram span{display:inline;margin-left:15px}.engineering{grid-template-columns:1fr;padding:40px 7%}.join{padding:60px 6%}h2{font-size:27px}footer{flex-wrap:wrap;gap:5px}footer>a:last-child{display:none}#workspace-view{height:calc(100dvh - 72px);grid-template-columns:1fr}aside{display:none}.chat-top{padding:12px 15px;font-size:13px}.demo-badge{font-size:11px}#messages{padding:20px}.welcome{padding-top:15px}.welcome h2{font-size:25px}.prompt-grid{margin:20px 0;display:grid}.prompt-grid button{padding:12px;font-size:13px}#chat-form{margin:10px 16px}.message{max-width:100%}.welcome>img{width:60px;height:60px;margin-bottom:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* V0.2 — problem-first conversation */
.hero{grid-template-columns:1.08fr 1fr;gap:55px;padding-top:65px;padding-bottom:65px}.hero h1{font-size:clamp(32px,3.3vw,50px)}.hero-promise{font-size:15px;color:var(--muted);max-width:440px;margin:24px 0 12px}.entry-panel{padding:28px;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 50px #142b4308}.entry-heading{display:flex;gap:12px;align-items:center;margin-bottom:22px}.entry-heading img{width:45px;height:45px}.entry-heading h3{font-size:18px;margin:0}.entry-heading span{font-size:14px;color:var(--muted)}#home-form textarea{font-size:16px;line-height:1.7;padding:16px;min-height:120px;background:white}#home-form .primary{width:100%;margin-top:10px}.starter-label{font-size:13px;color:var(--muted);margin:24px 0 10px}.entry-prompts{display:grid;gap:8px}.entry-prompts button{text-align:left;padding:10px 12px;background:white;border:1px solid var(--line);border-radius:5px;color:var(--ink);font-size:14px}.entry-prompts button span{float:right;color:var(--gold)}.entry-prompts button:hover{border-color:var(--gold);background:#fffdf8}.entry-panel .caption{font-size:12px;margin-bottom:0}.summary-card{margin:20px 0 25px;padding:24px;border:1px solid #d8c7a8;border-top:3px solid var(--gold);border-radius:8px;background:#fffcf7;white-space:pre-wrap;overflow-wrap:anywhere}.summary-card h3{font-size:21px}.summary-card .summary-note{font-size:12px;color:var(--muted)}.summary-card h4{font-size:14px;margin:20px 0 5px;color:var(--gold)}.summary-card p{font-size:15px;margin:0}.message{overflow-wrap:anywhere}#mobile-new{padding:0;font-size:13px}.chat-top{align-items:center;gap:12px}textarea{font-size:15px;line-height:1.6}
@media(max-width:720px){.hero{grid-template-columns:1fr;padding:35px 6%;gap:24px}.hero h1{font-size:32px}.hero .intro br{display:none}.entry-panel{padding:20px}.entry-heading h3{font-size:17px}.entry-prompts button{font-size:14px}.chat-top>span:first-child{font-size:12px}.chat-top .demo-badge{font-size:10px}.summary-card{padding:18px}.summary-card h3{font-size:19px}}
/* Expert portrait draft */
.expert{align-items:center}.expert-portrait{margin:0;border-left:3px solid var(--gold);padding-left:20px}.expert-portrait img{display:block;width:150px;max-width:100%;height:160px;object-fit:contain;object-position:bottom;background:#f2f5f7;border-radius:8px}.expert-portrait figcaption{font-size:15px;margin-top:10px}.expert-portrait figcaption span{display:block;font-size:12px;color:var(--muted)}
@media(max-width:720px){.expert-portrait{display:flex;align-items:center;gap:20px}.expert-portrait img{width:115px;height:125px}.expert-portrait figcaption{margin:0}}

/* V0.4 — three distinct journeys */
.mode-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.mode-links a{padding:10px 16px;border:1px solid var(--line);border-radius:5px;font-size:14px}.mode-links a:hover{background:var(--paper)}.knowledge{border-top:1px solid var(--line)}.review-notice{font-size:13px;color:var(--muted);border-left:2px solid var(--gold);padding-left:14px}.questions{margin-bottom:24px}.knowledge-basis{margin-top:48px;padding:24px;background:var(--paper);border-radius:8px;max-width:1000px}.knowledge-basis p{font-size:15px;color:var(--muted)}.engineering{margin-bottom:65px}dialog{max-height:85dvh;overflow:auto}dialog h2{font-size:25px;padding-right:15px}dialog .primary{margin-top:18px}#more-answers button{border-right:1px solid var(--line)}
@media(max-width:720px){.mode-links{gap:8px}.mode-links a{font-size:13px}.knowledge-basis{padding:20px}.engineering{margin-bottom:35px}dialog{padding:30px 22px}dialog h2{font-size:22px}}

.preview-status{display:flex;gap:18px;align-items:center;justify-content:center;padding:14px 24px;background:#f5f1e8;color:#1c2a41;font-size:14px;border-bottom:1px solid #e5dccb}.preview-status strong{white-space:nowrap}.preview-status span{color:#596578}@media(max-width:700px){.preview-status{align-items:flex-start;flex-direction:column;gap:5px;font-size:12px}}