:root{color-scheme:light;--max-width: 860px;--wide-width: 1180px;--reading-width: 720px;--space: 1rem;--radius-xs: 8px;--radius-sm: 12px;--radius: 18px;--radius-lg: 28px;--radius-xl: 40px;--text: #17171b;--text-strong: #050507;--muted: #686873;--muted-strong: #4b4b55;--border: rgba(20, 20, 28, .1);--border-strong: rgba(20, 20, 28, .17);--bg: #f6f6f8;--surface: rgba(255, 255, 255, .82);--surface-solid: #fff;--surface-subtle: #f0f0f3;--primary: #111114;--primary-hover: #313138;--primary-text: #fff;--brand: #5b5bd6;--brand-deep: #3f3fb7;--brand-soft: #eeedff;--accent: #0a84ff;--danger: #c9342f;--danger-soft: #fff0ef;--success: #257a4d;--success-soft: #edf8f1;--warning: #a25c04;--warning-soft: #fff6e8;--info: #1769aa;--info-soft: #edf6ff;--shadow-xs: 0 1px 2px rgba(18, 18, 24, .04);--shadow-sm: 0 8px 30px rgba(18, 18, 24, .06);--shadow-md: 0 24px 70px rgba(18, 18, 24, .1);--ease: cubic-bezier(.22, 1, .36, 1)}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--bg);-webkit-text-size-adjust:100%}body{position:relative;margin:0;min-width:320px;color:var(--text);background:radial-gradient(circle at 50% -180px,rgba(114,112,255,.11),transparent 440px),var(--bg);font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,PingFang SC,Helvetica Neue,Segoe UI,sans-serif;font-size:16px;line-height:1.62;letter-spacing:-.012em;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}button,input,textarea{font:inherit}button,a,textarea,input{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,textarea:focus-visible,input:focus-visible{outline:3px solid rgba(10,132,255,.28);outline-offset:3px}a{color:inherit}#app{position:relative;z-index:0;isolation:isolate;min-height:100vh}#app:before,#app:after{content:"";position:fixed;z-index:-2;pointer-events:none}#app:before{width:min(54vw,760px);aspect-ratio:1;top:8vh;right:-20vw;border-radius:50%;background:radial-gradient(circle at 42% 42%,rgba(104,97,255,.15),transparent 35%),radial-gradient(circle at 64% 62%,rgba(10,132,255,.11),transparent 42%);filter:blur(7px)}#app:after{inset:0;z-index:-1;opacity:.34;background-image:radial-gradient(circle,rgba(73,73,93,.16) .7px,transparent .8px),linear-gradient(115deg,transparent 44%,rgba(91,91,214,.035) 44%,rgba(91,91,214,.035) 44.2%,transparent 44.2%);background-size:26px 26px,100% 100%;-webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.72),transparent 72%);mask-image:linear-gradient(to bottom,rgba(0,0,0,.72),transparent 72%)}.page{position:relative;width:min(100%,var(--max-width));min-height:100vh;margin:0 auto;padding:28px 28px 80px}.btn{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border:1px solid var(--border-strong);border-radius:999px;color:var(--text-strong);background:#ffffffb8;box-shadow:var(--shadow-xs);font-weight:600;line-height:1.2;letter-spacing:-.015em;cursor:pointer;transition:transform .22s var(--ease),box-shadow .22s var(--ease),background-color .22s ease,border-color .22s ease,opacity .22s ease}.btn:hover:not(:disabled){transform:translateY(-1px);border-color:#14141c40;box-shadow:0 8px 22px #1212181a}.btn:active:not(:disabled){transform:translateY(0) scale(.985)}.btn:disabled{opacity:.42;cursor:not-allowed;box-shadow:none}.btn-primary{color:var(--primary-text);background:var(--primary);border-color:var(--primary);box-shadow:0 8px 24px #1111142b}.btn-primary:hover:not(:disabled){color:var(--primary-text);background:var(--primary-hover);border-color:var(--primary-hover);box-shadow:0 12px 32px #11111438}.btn-ghost{background:#ffffff9e;-webkit-backdrop-filter:saturate(150%) blur(14px);backdrop-filter:saturate(150%) blur(14px)}.btn-sm{min-height:38px;padding:8px 15px;font-size:.86rem}.btn-lg{min-height:54px;padding:14px 26px;font-size:1rem}.text-link{color:var(--brand-deep);font-weight:600;text-decoration:none}.text-link:hover{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}.page-header{min-height:58px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:48px}.page-title{margin:0;color:var(--text-strong);font-size:1.03rem;font-weight:700;letter-spacing:-.035em}.header-actions{display:flex;align-items:center;gap:8px}.connection-pill{min-height:34px;display:inline-flex;align-items:center;gap:7px;padding:7px 11px;border:1px solid var(--border);border-radius:999px;color:var(--muted);background:#ffffffad;box-shadow:var(--shadow-xs);-webkit-backdrop-filter:saturate(150%) blur(14px);backdrop-filter:saturate(150%) blur(14px);font-size:.74rem;font-weight:650;line-height:1;white-space:nowrap}.connection-dot{width:7px;height:7px;border-radius:50%;background:#a5a5ad;box-shadow:0 0 0 4px #a5a5ad1f}.connection-pill.is-checking .connection-dot{animation:connection-pulse 1.2s ease-in-out infinite}.connection-pill.is-online{color:var(--success);border-color:#257a4d24;background:#edf8f1d1}.connection-pill.is-online .connection-dot{background:#34a869;box-shadow:0 0 0 4px #34a8691f}.connection-pill.is-offline{color:var(--danger);border-color:#c9342f24;background:#fff0efdb}.connection-pill.is-offline .connection-dot{background:var(--danger);box-shadow:0 0 0 4px #c9342f1a}@keyframes connection-pulse{50%{opacity:.38;transform:scale(.78)}}.page-landing,.page-how{width:100%;max-width:none;padding:0 0 72px}.site-header{position:sticky;top:0;z-index:30;width:min(calc(100% - 32px),var(--wide-width));min-height:64px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;margin:12px auto 0;padding:9px 12px 9px 20px;border:1px solid rgba(255,255,255,.62);border-radius:999px;background:#fafafcbd;box-shadow:0 7px 26px #12121812;-webkit-backdrop-filter:saturate(180%) blur(24px);backdrop-filter:saturate(180%) blur(24px)}.site-brand{width:fit-content;color:var(--text-strong);font-size:1.08rem;font-weight:750;letter-spacing:-.045em;text-decoration:none}.site-brand:after{content:" / 认知欠条";color:var(--muted);font-size:.76rem;font-weight:500;letter-spacing:-.02em}.site-nav{display:flex;align-items:center;gap:4px;padding:3px;border-radius:999px;background:#1e1e230e}.site-nav-link{padding:7px 14px;border-radius:999px;color:var(--muted);font-size:.88rem;font-weight:500;text-decoration:none;transition:color .18s ease,background-color .18s 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44%)}.landing-hero:after{width:420px;height:420px;bottom:-260px;background:#9579ff1a;filter:blur(50px)}.hero-title{max-width:980px;margin:0;color:var(--text-strong);font-size:clamp(3.15rem,7.2vw,6.8rem);font-weight:760;line-height:.98;letter-spacing:-.072em;text-wrap:balance}.hero-title:first-line{color:var(--text-strong)}.hero-subtitle{max-width:720px;margin:34px auto 0;color:var(--muted-strong);font-size:clamp(1.08rem,1.8vw,1.34rem);line-height:1.62;letter-spacing:-.022em;text-wrap:pretty}.hero-cta{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:36px}.landing-section{width:min(calc(100% - 48px),var(--wide-width));margin:0 auto;padding:116px 0}.landing-section>.section-heading{max-width:780px;margin:0 auto 54px;padding:0;border:0;color:var(--text-strong);font-size:clamp(2.3rem,5vw,4.7rem);font-weight:730;line-height:1.06;letter-spacing:-.062em;text-align:center;text-wrap:balance}.pains{width:min(calc(100% - 32px),1260px);padding:108px 48px;border-radius:var(--radius-xl);background:#0f0f12;box-shadow:var(--shadow-md)}.pains>.section-heading{color:#fff}.pain-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.pain-card{min-height:300px;display:flex;flex-direction:column;justify-content:space-between;padding:30px;border:1px solid rgba(255,255,255,.09);border-radius:var(--radius-lg);background:linear-gradient(145deg,#ffffff17,#ffffff09);transition:transform .32s var(--ease),border-color .32s ease}.pain-card:hover{transform:translateY(-5px);border-color:#fff3}.pain-title{margin:0;color:#fff;font-size:clamp(1.28rem,2.1vw,1.72rem);font-weight:650;line-height:1.22;letter-spacing:-.038em;text-wrap:balance}.pain-desc{margin:34px 0 0;color:#ffffff9e;font-size:.96rem;line-height:1.68}.how-overview{padding-top:150px}.how-steps{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.how-steps:before{content:"";position:absolute;top:29px;left:16.66%;right:16.66%;height:1px;background:linear-gradient(90deg,transparent,var(--border-strong) 12%,var(--border-strong) 88%,transparent)}.how-step{position:relative;padding:0 26px;text-align:center}.step-number{position:relative;z-index:1;width:58px;height:58px;display:inline-flex;align-items:center;justify-content:center;margin:0 auto 28px;border:7px solid var(--bg);border-radius:50%;color:var(--primary-text);background:var(--primary);box-shadow:0 0 0 1px var(--border);font-weight:700}.step-title{margin:0 0 12px;color:var(--text-strong);font-size:1.28rem;line-height:1.25;letter-spacing:-.035em}.step-desc{margin:0;color:var(--muted);font-size:.96rem;line-height:1.68}.how-more{margin:52px 0 0;text-align:center}.bottom-cta{width:min(calc(100% - 32px),var(--wide-width));min-height:470px;display:flex;flex-direction:column;align-items:center;justify-content:center;margin-top:50px;padding:70px 24px;overflow:hidden;border-radius:var(--radius-xl);background:radial-gradient(circle at 30% 10%,rgba(128,102,255,.42),transparent 34%),radial-gradient(circle at 75% 85%,rgba(10,132,255,.3),transparent 34%),#17171c;box-shadow:var(--shadow-md)}.cta-heading{max-width:720px;margin:0 0 32px;color:#fff;font-size:clamp(2.5rem,5vw,5rem);font-weight:730;line-height:1.04;letter-spacing:-.062em;text-align:center;text-wrap:balance}.bottom-cta .btn-primary{color:#151519;background:#fff;border-color:#fff}.bottom-cta .btn-primary:hover:not(:disabled){color:#151519;background:#f0efff;border-color:#f0efff}.page-how>.site-header{margin-bottom:82px}.doc-section{width:min(calc(100% - 48px),var(--reading-width));margin:0 auto;padding:68px 0;border-bottom:1px solid var(--border)}.doc-section:first-of-type{padding-top:56px}.doc-title{margin:0 0 72px;color:var(--text-strong);font-size:clamp(3.3rem,7vw,6.1rem);font-weight:750;line-height:.98;letter-spacing:-.072em}.doc-heading{margin:0 0 24px;color:var(--text-strong);font-size:clamp(1.65rem,3vw,2.4rem);font-weight:680;line-height:1.16;letter-spacing:-.048em;text-wrap:balance}.doc-text{margin:0 0 20px;color:var(--muted-strong);font-size:1.06rem;line-height:1.82}.doc-list{margin:0;padding:0;list-style:none;counter-reset:danger}.doc-list li{position:relative;margin:0;padding:20px 20px 20px 58px;border-bottom:1px solid var(--border);color:var(--muted-strong);line-height:1.7;counter-increment:danger}.doc-list li:before{content:counter(danger,decimal-leading-zero);position:absolute;left:8px;top:21px;color:var(--brand);font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:.75rem;font-weight:700}.doc-flow{margin:32px 0 0;padding:28px;overflow-x:auto;border:1px solid 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12px;color:#525260;font-size:.94rem;line-height:1.75}.doc-note-text:last-child{margin-bottom:0}.status-explained-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:30px}.status-explained{min-height:180px;padding:24px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-xs)}.status-explained-desc{margin:14px 0 0;color:var(--muted);font-size:.9rem;line-height:1.65}.doc-cta{padding-top:84px;padding-bottom:84px;border-bottom:0;text-align:center}.site-footer{width:min(calc(100% - 48px),var(--wide-width));margin:110px auto 0;padding:34px 0 0;border-top:1px solid var(--border);text-align:center}.footer-brand{margin:0 0 4px;color:var(--text-strong);font-weight:750;letter-spacing:-.035em}.footer-tagline{margin:0 0 20px;color:var(--muted);font-size:.88rem}.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;margin-bottom:18px}.footer-link{color:var(--muted);font-size:.84rem;text-decoration:none}.footer-link:hover{color:var(--text)}.footer-copy{margin:0;color:#94949d;font-size:.76rem}.page-login{position:relative;width:100%;max-width:none;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden;padding:72px 24px;text-align:center}.page-login:before{content:"";position:absolute;z-index:-1;width:min(760px,95vw);aspect-ratio:1;top:-44%;border-radius:50%;background:radial-gradient(circle at 42% 50%,rgba(112,102,255,.22),transparent 45%),radial-gradient(circle at 66% 62%,rgba(10,132,255,.14),transparent 42%)}.brand-title{margin:0;color:var(--text-strong);font-size:clamp(3.7rem,10vw,6.6rem);font-weight:760;line-height:.95;letter-spacing:-.075em}.brand-subtitle{margin:20px 0 44px;color:var(--muted);font-size:1.08rem}.login-card{width:min(100%,420px);padding:34px;border:1px solid rgba(255,255,255,.78);border-radius:var(--radius-lg);background:#ffffffc2;box-shadow:var(--shadow-md);-webkit-backdrop-filter:saturate(165%) blur(26px);backdrop-filter:saturate(165%) blur(26px);text-align:left}.login-card>.connection-pill{margin:0 0 18px}.login-heading{margin:0 0 8px;color:var(--text-strong);font-size:1.42rem;line-height:1.2;letter-spacing:-.04em}.login-desc{margin:0 0 22px;color:var(--muted);font-size:.91rem}.login-form{display:flex;flex-direction:column;gap:12px}.login-input,.artifact-input,.confusion-input,.answer-input{width:100%;border:1px solid var(--border-strong);border-radius:var(--radius-sm);color:var(--text);background:#ffffffe6;box-shadow:inset 0 1px 1px #12121806;transition:border-color .18s ease,box-shadow .18s ease,background-color .18s ease}.login-input{min-height:52px;padding:13px 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16px;color:var(--text-strong);font-size:clamp(2.4rem,6vw,4.35rem);font-weight:730;line-height:1.04;letter-spacing:-.062em;text-wrap:balance}.app-desc,.timeline-desc{max-width:680px;margin:0;color:var(--muted);font-size:1.04rem;line-height:1.72}.app-expect{margin-bottom:24px;padding:26px 28px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-xs)}.expect-heading{margin:0 0 16px;color:var(--text-strong);font-size:.94rem}.expect-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:0;padding:0;list-style:none;counter-reset:expect}.expect-item{position:relative;margin:0;padding:40px 16px 4px 0;color:var(--muted);font-size:.88rem;line-height:1.55;counter-increment:expect}.expect-item:before{content:counter(expect);position:absolute;top:0;left:0;width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;color:var(--brand-deep);background:var(--brand-soft);font-size:.75rem;font-weight:700}.input-form{display:flex;flex-direction:column;gap:10px;padding:22px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface-solid);box-shadow:var(--shadow-sm)}.demo-bar{margin-bottom:2px}.btn-demo-sample{background:transparent;border:1px dashed var(--border);color:var(--text-secondary);padding:6px 14px;border-radius:4px;font-size:.85rem;cursor:pointer;transition:border-color .15s,color .15s}.btn-demo-sample:hover{border-color:var(--text-primary);color:var(--text-primary)}.artifact-input{min-height:310px;padding:20px;border:0;border-radius:var(--radius);background:var(--surface-subtle);font-size:1rem;line-height:1.7;resize:vertical}.artifact-input::placeholder,.confusion-input::placeholder,.answer-input::placeholder{color:#9a9aa4}.input-counter{margin:-42px 12px 15px 0;color:var(--muted);font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:.72rem;text-align:right;pointer-events:none}.input-counter.is-warn{color:var(--danger)}.input-counter.is-error{color:#b42318;font-weight:700}.input-limits{margin:12px 0 0;padding:14px 16px;border:1px solid rgba(47,92,255,.16);border-radius:16px;background:#2f5cff0e;color:var(--muted);font-size:.82rem}.input-limit-title{margin:0 0 6px;color:var(--text);font-weight:700}.input-limit-list{margin:0;padding-left:1.25rem;line-height:1.65}.input-hint{margin:0;color:var(--muted);font-size:.79rem}.input-hint:before{content:"隐私提示 · ";color:var(--text);font-weight:650}html[lang=en] .input-hint:before{content:"Privacy notice · "}.form-actions{display:flex;justify-content:flex-end;margin-top:8px}.step-indicator{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:0 0 44px;padding:0 16px}.step-indicator:before{content:"";position:absolute;top:16px;left:calc(16.66% + 16px);right:calc(16.66% + 16px);height:1px;background:var(--border-strong)}.step-dot{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:8px;color:#9999a2;font-size:.75rem;text-align:center}.step-dot-num{width:33px;height:33px;display:inline-flex;align-items:center;justify-content:center;border:5px solid var(--bg);border-radius:50%;color:#85858e;background:#e1e1e5;box-shadow:0 0 0 1px var(--border);font-size:.7rem;font-weight:700}.step-dot.is-active{color:var(--text-strong);font-weight:650}.step-dot.is-active 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