:root{color-scheme:light;--bg:#fafcfc;--surface:#fff;--ink:#172a35;--muted:#647581;--faint:#84949d;--accent:#287783;--line:#e8edef;--line-strong:#d2dfe3;--soft:#eef6f6;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif}
:root[data-resolved-theme=dark]{color-scheme:dark;--bg:#0c171c;--surface:#11232b;--ink:#e0eaf0;--muted:#a4b6c1;--faint:#8096a2;--accent:#62c6d1;--line:#24373f;--line-strong:#36535c;--soft:#18343d}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:95px}
body.about-page{margin:0;overflow:auto;background:var(--bg);color:var(--ink);font-size:14px;line-height:1.85}
.about-shell{background:var(--bg);color:var(--ink);font-size:14px;line-height:1.85;min-height:100vh}
a{color:var(--accent);text-underline-offset:4px}
button{font:inherit;cursor:pointer}
a,button{-webkit-tap-highlight-color:transparent}
a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:4px}
[hidden]{display:none!important}
.seo-skip{position:absolute;left:-9999px;top:8px}
.seo-skip:focus{left:12px;z-index:30;background:var(--surface);padding:8px 16px}

/* Reuse the product sidebar stylesheet and markup, without loading the reader app. */
body.about-page{--sidebar-w:224px}
.about-shell{margin-left:var(--sidebar-w)}
body.about-page .sidebar{--sidebar-w:224px;position:fixed;inset:0 auto 0 0;width:224px;height:100dvh;min-height:0;font-family:"Inter","PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.5}
body.about-page .nav-list a{text-decoration:none}
body.about-page .sidebar [hidden]{display:none!important}
.seo-skip:focus{z-index:200}
.seo-header{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;min-height:58px;gap:18px;padding:12px 32px;background:var(--surface);border-bottom:1px solid var(--line)}
.about-header-home{color:var(--ink);font-size:12px;text-decoration:none;white-space:nowrap}
.about-header-home span{margin-left:8px;color:var(--faint)}
.seo-header nav{display:flex;gap:18px}
.seo-header nav a{color:var(--muted);font-size:12px;text-decoration:none}
.seo-header nav a[aria-current]{color:var(--accent)}
.about-menu{display:none}
.about-main,.seo-footer{width:calc(100% - 64px);max-width:none;margin-inline:auto}
.about-main{padding-top:30px}
.about-kicker{margin:0 0 15px;color:var(--accent);font-size:11px;font-weight:700;line-height:1.5;letter-spacing:.08em}
.about-kicker::before{content:"";display:inline-block;width:18px;height:1px;margin:0 9px 4px 0;background:var(--accent)}

/* Product introduction and founder share the first screen. */
.about-hero{display:grid;grid-template-columns:1.12fr 1fr;gap:38px;align-items:center;min-height:260px}
.about-hero h1{margin:0;font-size:clamp(28px,2.65vw,46px);font-weight:800;line-height:1.38;letter-spacing:-.045em}
.about-hero h1 span{color:var(--accent)}
.about-lead{margin:16px 0 18px;max-width:720px;font-size:13px;line-height:1.95;color:var(--muted)}
.about-actions{display:flex;flex-wrap:wrap;gap:12px}
.about-button{display:inline-flex;align-items:center;justify-content:center;gap:14px;padding:8px 20px;min-height:40px;border:1px solid var(--line-strong);border-radius:25px;background:var(--surface);color:var(--ink);font-size:12px;font-weight:650;text-decoration:none}
.about-button.primary{border-color:var(--accent);background:var(--accent);color:var(--surface)}
:root[data-resolved-theme=dark] .about-button.primary{color:#10262d}
.about-button:hover{filter:brightness(.96)}
.about-founder{display:grid;grid-template-columns:minmax(160px,220px) minmax(140px,1fr);gap:28px;align-items:center;padding:10px 0;position:relative;isolation:isolate}
.about-founder::before{content:"";position:absolute;z-index:-1;inset:25px 0 25px -30px;background:linear-gradient(120deg,var(--soft),transparent 85%);border-radius:20px}
.about-founder>img{width:100%;height:240px;object-fit:cover;object-position:center;border-radius:15px}
.about-founder-copy h2{font-size:24px;margin:0;line-height:1.4}
.about-founder-copy .about-kicker{font-size:10px;margin-bottom:10px}
.founder-role{font-size:11px;color:var(--muted);margin:5px 0 22px}
.founder-vision{font-size:13px;color:var(--muted);margin:0 0 15px;line-height:1.95;padding-top:16px;border-top:1px solid var(--line-strong)}
.about-text-link{font-size:12px;text-decoration:none}

/* The signature river uses the existing bounded Canvas animation. */
.about-process{position:relative;margin-top:22px;padding:17px 20px 10px;background:var(--surface);border:1px solid var(--line);border-radius:14px}
.about-section-heading{display:flex;justify-content:space-between;align-items:center;gap:18px}
.about-section-heading h2{margin:0;font-size:14px;color:var(--ink)}
.about-process .about-section-heading{position:absolute;top:14px;right:16px}
.about-process .about-section-heading h2{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.about-channels{display:inline-flex;padding:3px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}
.about-channels button{min-height:29px;padding:3px 12px;border:0;border-radius:5px;background:transparent;color:var(--muted);font-size:11px}
.about-channels button[aria-pressed=true]{background:var(--soft);color:var(--accent);font-weight:650}
.river-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;list-style:none;margin:0 145px 0 160px;padding:0}
.river-steps li{min-width:0}
.river-steps strong{display:block;color:var(--accent);font-size:12px}
.river-steps span{display:block;color:var(--faint);font-size:10px}
.about-river-layout{display:grid;grid-template-columns:155px minmax(0,1fr);gap:4px;margin-top:6px}
.river-sources{position:relative;top:-35px;z-index:1;background:var(--surface)}
.river-sources>span{font-size:11px;display:block;color:var(--muted)}
.river-sources>strong{display:block;font-size:29px;line-height:1.4;letter-spacing:-.035em;font-variant-numeric:tabular-nums}
.river-sources>small{color:var(--faint);font-size:10px}
.river-sources ul{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:4px}
.river-sources li{font-size:10px;line-height:1.6;color:var(--muted)}
.river-sources li::before{content:"";display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--accent);margin:0 7px 1px 0;opacity:.7}
.about-river{height:180px;position:relative;isolation:isolate}
.about-river canvas,.river-fallback{position:absolute;inset:0;width:100%;height:100%}
.about-river canvas{pointer-events:none}
.about-river.is-ready .river-fallback{display:none}
.river-tooltip{position:absolute;z-index:3;max-width:240px;padding:7px 11px;border:1px solid var(--line);border-radius:7px;background:var(--surface);box-shadow:0 4px 16px #172a3812;font-size:12px;pointer-events:none}
.river-tooltip>div:last-child{color:var(--muted);font-size:11px}
.river-latest{position:absolute;left:85%;right:0;top:24%;padding:9px 10px;border:1px solid var(--line);border-radius:11px;background:var(--surface);text-decoration:none;box-shadow:0 5px 20px #2877830a}
.river-output{display:grid;gap:0;padding-bottom:7px}
.river-output>span{font-size:10px;color:var(--muted)}
.river-output b{font-size:25px;line-height:1.4;color:var(--ink);font-variant-numeric:tabular-nums}
.river-output small{font-size:9px;color:var(--faint)}
.river-latest .about-kicker{margin:0;font-size:9px}
.river-latest .about-kicker::before{display:none}
.river-latest>strong{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:10px;line-height:1.6;color:var(--ink);margin:3px 0}
.river-latest>span:last-child{display:none}
.river-caption{margin:0;color:var(--faint);font-size:10px}
.about-data-status{margin:6px 0 0;font-size:10px;color:var(--faint)}

.about-metrics{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin-top:13px}
.about-metrics>div{display:flex;align-items:flex-start;gap:11px;padding:17px 15px;min-width:0;border:1px solid var(--line);border-radius:11px;background:var(--surface)}
.about-metrics>div>div{min-width:0}
.metric-icon,.intro-icon{display:flex;flex-shrink:0;align-items:center;justify-content:center;width:32px;height:32px;border-radius:10px;background:var(--soft);color:var(--accent);font-size:21px;line-height:1}
.metric-icon svg,.intro-icon svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.about-metrics h2{margin:1px 0 3px;font-size:11px;font-weight:650}
.about-metrics strong{display:block;font-size:29px;line-height:1.35;letter-spacing:-.045em;font-variant-numeric:tabular-nums}
.about-metrics p{margin:4px 0 0;color:var(--faint);font-size:10px;line-height:1.65;overflow-wrap:anywhere}
.about-metrics p a{text-decoration:none}
.about-intro-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:13px}
.about-intro-grid>article{display:flex;align-items:flex-start;gap:12px;padding:20px 17px;min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:11px}
.about-intro-grid>article>div{min-width:0}
.about-intro-grid h2{margin:2px 0 11px;font-size:14px;line-height:1.6}
.about-intro-grid p{color:var(--muted);font-size:12px;line-height:1.9;margin:0 0 10px}
.about-intro-grid a{font-size:11px;text-decoration:none}
.about-intro-grid ol{padding:0;margin:0 0 10px;counter-reset:workflow}
.about-intro-grid li{margin:8px 0;list-style:none;color:var(--muted);font-size:11px}
.about-intro-grid li::before{counter-increment:workflow;content:counter(workflow,decimal-leading-zero);margin-right:7px;color:var(--faint);font-size:9px}
.about-intro-grid b{color:var(--ink);margin-right:5px;font-weight:650}

/* Actual linked events, founder contact and the preserved GEO record. */
.about-associations,.about-creator,#jinlun{scroll-margin-top:90px}
.about-associations{margin-top:42px}
.about-associations .about-section-heading h2{font-size:25px;letter-spacing:-.03em}
.about-associations .about-kicker{margin-bottom:7px}
.about-association-lead{font-size:13px;color:var(--muted);margin:10px 0 20px}
.about-events{border-top:1px solid var(--line)}
.about-event{display:grid;grid-template-columns:minmax(0,1fr) auto 16px;gap:4px 24px;align-items:center;padding:17px 0;border-bottom:1px solid var(--line);text-decoration:none}
.about-event>strong{font-size:14px;line-height:1.7;color:var(--ink);font-weight:650}
.about-event-sources{grid-column:1;font-size:11px;color:var(--faint)}
.about-event-counts{grid-column:2;grid-row:1 / span 2;white-space:nowrap;color:var(--accent);font-size:12px}
.event-arrow{grid-column:3;grid-row:1 / span 2;color:var(--accent)}
.about-event:hover>strong{color:var(--accent)}
.about-creator{display:grid;grid-template-columns:1fr 1fr;gap:65px;padding-top:42px;margin-top:45px;border-top:1px solid var(--line-strong)}
.creator-title{display:flex;align-items:center;gap:16px;margin:22px 0}
.creator-title>img{width:54px;height:54px;border-radius:50%;object-fit:cover}
.creator-title h2{font-size:27px;line-height:1.4;margin:0}
.creator-title h2 span{color:var(--accent)}
.about-creator p{font-size:13px;color:var(--muted);margin:0 0 18px;line-height:2}
.about-creator .about-kicker{font-size:11px;color:var(--accent)}
.about-contacts>p{font-size:12px;color:var(--ink);font-weight:650;margin-bottom:14px}
.about-contact-card{display:flex;align-items:center;gap:20px;border:1px solid var(--line);border-radius:10px;padding:16px;margin-bottom:12px;background:var(--surface);text-decoration:none}
.about-contact-card>img{width:82px;height:82px;border-radius:6px;object-fit:contain;background:white}
.about-contact-card>span{display:grid;gap:4px;min-width:0}
.about-contact-card small{font-size:10px;color:var(--faint)}
.about-contact-card strong{font-size:14px;color:var(--ink)}
.about-contact-card span span{font-size:11px;color:var(--muted)}
.about-more{margin-top:40px;border-top:1px solid var(--line-strong);scroll-margin-top:90px}
.about-more>summary{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 0;cursor:pointer;list-style:none}
.about-more>summary::-webkit-details-marker{display:none}
.about-more>summary>span:first-child{display:grid;gap:5px}
.about-more>summary strong{font-size:15px;font-weight:650}
.about-more>summary small{font-size:12px;color:var(--muted)}
.about-more-action{display:flex;align-items:center;gap:10px;color:var(--accent);font-size:12px;white-space:nowrap}
.about-more-chevron{font-size:20px;line-height:1}
.about-more .when-open{display:none}
.about-more[open] .when-open{display:inline}
.about-more[open] .when-closed{display:none}
.about-more[open] .about-more-chevron{transform:rotate(180deg)}
.about-more>summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px;border-radius:5px}
.about-dossier{display:grid;grid-template-columns:170px minmax(0,1fr);gap:48px;padding-top:24px}
.about-directory{align-self:start;position:sticky;top:94px}
.about-directory nav{display:grid;gap:4px}
.about-directory nav a{padding:8px 0;color:var(--muted);text-decoration:none;font-size:13px}
.about-directory nav a:hover{color:var(--accent)}
.about-directory>p:not(.about-kicker){margin-top:30px;color:var(--faint);font-size:12px}
.directory-method{font-size:12px;text-decoration:none}
.directory-method span{margin-left:20px}
.about-records{min-width:0}
.about-records .founder-title{margin:0 0 28px;font-size:30px;line-height:1.5}
.about-records h2{font-size:20px;line-height:1.5;margin:0 0 15px}
.about-records p{margin:0 0 16px;color:var(--muted);overflow-wrap:anywhere}
.about-records strong{font-weight:650;color:var(--ink)}
.about-records section{padding:30px 0;border-top:1px solid var(--line);scroll-margin-top:90px}
.about-records .seo-callout{padding:22px 25px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.seo-founder-profile{display:grid;grid-template-columns:96px minmax(0,1fr);gap:24px;align-items:start;margin:26px 0 32px}
.seo-founder-profile>img{width:96px;height:112px;object-fit:cover;border-radius:12px;border:1px solid var(--line)}
.seo-founder-profile .seo-lead{color:var(--ink);font-size:16px}
.seo-founder-profile p:last-child{font-size:13px}
.seo-checklist{padding-left:20px;display:grid;gap:11px;color:var(--muted)}
.seo-checklist li::marker{color:var(--accent)}
.about-records .seo-meta{font-size:12px;color:var(--faint)}
.seo-contact-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));list-style:none;padding:0;margin:0 0 20px;gap:13px 20px}
.seo-contact-list li{overflow-wrap:anywhere;color:var(--muted)}
#contact{padding:26px;background:var(--soft);border:1px solid var(--line);border-radius:12px;margin:10px 0 30px}
#continue-learning{padding-bottom:0}
.about-rights{margin:50px 0 30px;padding:22px 26px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.about-rights h2{font-size:13px;margin:0 0 6px}
.about-rights p{font-size:12px;margin:0;color:var(--muted)}
.seo-footer{padding:24px 0 35px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:var(--faint);font-size:12px}
.seo-footer p{margin:0}
.seo-footer nav{display:flex;flex-wrap:wrap;gap:10px 20px}
.seo-footer a{color:var(--muted);text-decoration:none}

@media(min-width:1800px){
  .about-hero{min-height:310px}.about-founder>img{height:280px}.about-river{height:270px}
}
@media(max-width:1300px){
  .about-hero{grid-template-columns:1fr 1fr;gap:25px}.about-founder{grid-template-columns:150px 1fr;gap:18px}.about-founder>img{height:220px}
  .about-hero h1{font-size:30px}.about-lead{font-size:12px}.about-founder-copy h2{font-size:21px}.founder-vision{font-size:12px}
  .about-metrics{gap:8px}.about-metrics>div{padding:14px 10px;gap:8px}.metric-icon{display:none}.about-metrics strong{font-size:26px}
  .about-intro-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.river-steps{margin-right:90px}.river-latest{left:82%}
  .seo-header nav{gap:12px}.seo-header nav a{font-size:11px}
}
@media(max-width:1000px){
  .about-hero{grid-template-columns:1fr;gap:24px}.about-founder{grid-template-columns:160px 1fr;max-width:580px;padding:0}.about-founder>img{height:180px}
  .about-hero h1{font-size:36px}.desktop-break{display:none}.about-metrics{grid-template-columns:repeat(3,minmax(0,1fr))}
  .about-river-layout{grid-template-columns:125px minmax(0,1fr)}.river-steps{margin:15px 70px 0 125px;gap:10px}.river-steps strong{font-size:10px}.river-steps span{display:none}
  .river-latest{left:75%}.river-latest>strong,.river-latest .about-kicker{display:none}
  .about-dossier{display:block}.about-directory{position:static;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:30px}
  .about-directory nav{display:flex;flex-wrap:wrap;gap:5px 22px}.about-directory nav a{padding:0}.about-directory>p:not(.about-kicker),.directory-method{display:none}.about-creator{gap:30px}
}
@media(max-width:900px){
  .about-shell{margin-left:0}.about-site-sidebar{display:none;top:58px;box-shadow:12px 0 30px #0002}.about-site-sidebar.is-open{display:flex}
  .about-menu{display:inline-flex;align-items:center;min-height:34px;padding:4px 10px;border:1px solid var(--line);border-radius:5px;background:var(--surface);color:var(--ink);font-size:12px}
  .seo-header{padding:10px 24px;gap:10px 16px}.about-header-home{margin-right:auto}.seo-header nav{display:none}.about-main{padding-top:30px}
}
@media(max-width:600px){
  .about-main,.seo-footer{width:calc(100% - 36px)}.seo-header{padding-inline:18px}.about-hero h1{font-size:clamp(26px,7vw,36px)}.about-lead{font-size:13px}
  .about-actions{gap:8px}.about-button{padding-inline:16px}.about-founder{grid-template-columns:128px minmax(0,1fr);gap:20px}.about-founder>img{height:167px;border-radius:11px}
  .about-founder-copy h2{font-size:21px}.about-founder-copy .about-kicker{font-size:9px;margin-bottom:5px}.founder-role{font-size:10px;margin-bottom:10px}
  .founder-vision{font-size:11px;margin-bottom:8px;padding-top:9px;line-height:1.8}.about-founder-copy .about-text-link{font-size:10px}
  .about-process{padding:14px 12px 11px}.about-process .about-section-heading{align-items:flex-start;flex-direction:column;gap:8px}.about-section-heading h2{font-size:12px}
  .about-process .about-section-heading{position:static;align-items:stretch}.about-process .about-section-heading h2{position:static;width:auto;height:auto;clip-path:none;white-space:normal}
  .about-river-layout{display:block;margin-top:0}.river-sources{top:auto;display:grid;grid-template-columns:auto auto 1fr;align-items:baseline;gap:0 8px;padding-top:10px}
  .river-sources>strong{font-size:22px}.river-sources ul{grid-column:1 / -1;display:flex;flex-wrap:wrap;gap:3px 10px;margin-top:3px}.river-sources li{font-size:9px}
  .river-steps{margin:10px 0 0;gap:5px}.river-steps strong{font-size:10px}.about-river{height:155px}.river-latest{top:22%;left:78%;padding:7px}
  .river-output b{font-size:20px}.river-output>span,.river-output small{font-size:8px}.river-output{padding:0}.river-caption,.about-data-status{font-size:9px;line-height:1.7}
  .about-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.about-metrics>div{padding:13px 12px}.about-metrics>div:last-child{grid-column:1 / -1}
  .about-metrics h2{font-size:11px}.about-metrics strong{font-size:27px}.about-intro-grid{grid-template-columns:1fr;gap:9px}.about-intro-grid>article{padding:18px 15px}
  .about-intro-grid h2{font-size:14px}.about-intro-grid p{font-size:13px}.about-associations .about-section-heading{align-items:flex-start}.about-associations .about-section-heading h2{font-size:21px}
  .about-text-link{font-size:11px}.about-event{grid-template-columns:minmax(0,1fr) 14px;gap:5px 8px;padding:16px 0}.about-event>strong{font-size:13px}.about-event-counts{grid-column:1;grid-row:3;font-size:11px}
  .event-arrow{grid-column:2;grid-row:1 / span 3}.about-creator{grid-template-columns:1fr;gap:28px;padding-top:32px;margin-top:38px}.creator-title h2{font-size:25px}
  .about-more{margin-top:28px}.about-more>summary{gap:12px;padding:20px 0}.about-more>summary strong{font-size:13px}.about-more>summary small{font-size:11px}.about-more-action{font-size:11px;gap:6px}
  .about-dossier{padding-top:20px}.about-records .founder-title{font-size:25px}.about-records h2{font-size:18px}.about-records .seo-callout{padding:18px}
  .seo-founder-profile{grid-template-columns:72px minmax(0,1fr);gap:16px}.seo-founder-profile>img{width:72px;height:88px}.seo-founder-profile .seo-lead{font-size:14px}
  .seo-contact-list{grid-template-columns:1fr;gap:10px}.about-rights{margin-top:36px;padding:18px}.seo-footer{font-size:11px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media(prefers-reduced-motion:reduce){.about-site-sidebar *,.about-site-sidebar *::before,.about-site-sidebar *::after{animation:none!important}}

@media(max-width:1100px){
  body.about-page .brand-text,body.about-page .nav-list span,body.about-page .nav-section-label,body.about-page .nav-group-chevron,body.about-page .sidebar-radar-box{display:revert}
  body.about-page .brand,body.about-page .nav-list>a,body.about-page .nav-group-label{justify-content:flex-start}
}
@media(max-width:900px){
  body.about-page .sidebar{display:none;top:58px;bottom:0;height:calc(100dvh - 58px);width:224px;right:auto;z-index:100;border-right:1px solid var(--border);border-bottom:0;overflow:hidden;padding:12px 10px}
  body.about-page .sidebar.is-open{display:flex}
  body.about-page .sidebar .brand{display:flex}
  body.about-page .sidebar .theme-toggle{display:flex;flex-direction:row}
  body.about-page .nav-list{flex-direction:column;min-width:0;height:auto;overflow-x:hidden;overflow-y:auto;align-items:stretch}
  body.about-page .nav-list>a,body.about-page .nav-group-label{flex-direction:row;min-width:0;min-height:40px;gap:10px;padding:9px 11px}
  body.about-page .nav-list>a>span,body.about-page .nav-group-label>span{font-size:13px;line-height:1.5}
  body.about-page .nav-group-items{position:static;display:flex;flex-direction:column;min-width:0;padding:2px 0 4px 29px;overflow:visible;border:0;border-radius:0;background:transparent;box-shadow:none}
  body.about-page .nav-group--collapsed .nav-group-items{display:none}
  body.about-page .nav-group-items a{min-width:0;padding:7px 10px}
}