:root{color-scheme:light;--paper:#f7f8fa;--white:#fcfcfe;--soft:#eef0f3;--line:#e3e6eb;--ink:#1f232b;--ink-soft:#3f454f;--muted:#686e78;--coral:#e8848a;--coral-soft:#fbdddf;--purple:#c9b6e8;--calm:#a8c5b8;--radius:24px;--font:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}*{box-sizing:border-box}html{scroll-padding-top:32px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--muted)}a:focus-visible,summary:focus-visible{outline:3px solid var(--purple);outline-offset:5px;border-radius:4px}p,h1,h2,h3,blockquote,figure{margin:0}p{text-wrap:pretty}h1,h2,h3{text-wrap:balance;font-weight:600;line-height:1.35}img{display:block;max-width:100%}.shell{width:min(1120px,calc(100% - 64px));margin-inline:auto}.skip-link{position:absolute;left:24px;top:-100px;z-index:10;background:var(--white);padding:12px 20px;border:1px solid var(--line)}.skip-link:focus{top:16px}.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:28px}.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;flex-shrink:0}.brand-icon{width:42px;height:42px;border-radius:11px}.brand-name{font-size:21px;font-weight:600}.site-nav{display:flex;align-items:center;gap:30px;font-size:14px;color:var(--ink-soft)}.site-nav a{text-decoration:none;padding-block:10px}.site-nav a[aria-current=page]{color:var(--ink);text-decoration:underline;text-decoration-color:var(--purple);text-decoration-thickness:2px;text-underline-offset:8px}.hero{display:grid;grid-template-columns:1fr 1.03fr;align-items:center;gap:88px;padding-block:68px 100px}.eyebrow{font-size:13px;color:var(--muted);margin-bottom:24px}.hero h1{font-size:clamp(44px,5.2vw,64px);line-height:1.22;letter-spacing:-.035em;white-space:nowrap}.hero-description{font-size:19px;line-height:1.85;color:var(--ink-soft);margin-top:28px;max-width:23em}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:20px;margin-top:36px}.button{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:50px;padding:12px 22px;border-radius:14px;background:var(--ink);color:var(--white);font-size:15px;font-weight:500;text-decoration:none}.button:hover{color:var(--white);background:var(--ink-soft)}.button:active{transform:scale(.98)}.text-link{font-size:14px;text-decoration-color:var(--line);text-decoration-thickness:1px}.fine{font-size:13px;color:var(--muted)}.hero-note{margin-top:22px}.demo{position:relative;background:var(--white);border-radius:var(--radius);padding:30px 32px 28px;box-shadow:0 2px 6px rgb(31 35 43 / 2%),0 20px 60px rgb(31 35 43 / 4%);border:1px solid rgb(227 230 235 / 65%)}.demo-top{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:12px;color:var(--muted);padding-bottom:22px;border-bottom:1px solid var(--soft)}.demo-title{font-size:24px;margin-top:24px}.mood{display:flex;align-items:center;gap:8px;margin:10px 0 22px;font-size:12px;color:var(--muted)}.mood-dot{width:7px;height:7px;border-radius:50%;background:var(--calm);flex-shrink:0}.demo-body{font-size:15px;line-height:2;color:var(--ink-soft)}.demo-body p+p{margin-top:14px}.echo-line{text-decoration:underline;text-decoration-color:var(--coral);text-decoration-thickness:2px;text-underline-offset:5px}.demo-source{margin-top:24px;padding-top:18px;border-top:1px solid var(--soft);font-size:12px;color:var(--muted);line-height:1.8}.source-label{display:block;color:var(--ink-soft);margin-bottom:6px;font-weight:500}.demo-echo{border-left:2px solid var(--coral-soft);padding-left:14px;margin-top:20px}.demo-echo .fine{margin-bottom:6px}.demo-echo blockquote{font-size:15px;line-height:1.8}.demo-caption{margin-top:12px;text-align:center;font-size:11px;color:var(--muted)}.section{padding-block:72px;border-top:1px solid var(--line)}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;margin-bottom:40px}.section-heading h2{font-size:32px}.section-heading>p{font-size:15px;color:var(--muted);max-width:28em}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:48px}.feature h3{font-size:20px;margin-bottom:14px}.feature p{font-size:15px;line-height:1.9;color:var(--ink-soft)}.feature-label{font-size:12px;color:var(--muted);margin-bottom:20px}.privacy-block{display:grid;grid-template-columns:.85fr 1.15fr;gap:80px}.privacy-block h2{font-size:32px;max-width:10em}.privacy-block p{font-size:15px;line-height:1.95;color:var(--ink-soft)}.privacy-block p+p{margin-top:16px}.privacy-block .text-link{display:inline-block;margin-top:22px}.invitation{background:var(--white);padding:40px;border-radius:var(--radius);display:flex;justify-content:space-between;gap:40px;align-items:center;margin-bottom:64px}.invitation h2{font-size:26px;margin-bottom:10px}.invitation p{font-size:15px;color:var(--muted)}.invitation .button{flex-shrink:0}.site-footer{display:flex;justify-content:space-between;gap:32px;padding:28px 0 36px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.footer-brand{display:flex;flex-direction:column;gap:7px}.footer-links{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:12px 22px;align-content:flex-start}.footer-links a{text-decoration:none;min-height:28px}.footer-links a:hover{text-decoration:underline}.contact-link{overflow-wrap:anywhere}.page-intro{padding:58px 0 42px}.page-intro .eyebrow{margin-bottom:18px}.page-intro h1{font-size:44px;letter-spacing:-.025em}.page-intro>p:last-child{margin-top:22px;max-width:44em;color:var(--ink-soft);font-size:17px}.article-shell{max-width:800px;margin:0 auto;padding-bottom:76px}.article-shell .page-intro{padding-top:60px}.article-body h2{font-size:23px;margin:42px 0 16px}.article-body h3{font-size:18px;margin:24px 0 10px}.article-body p{color:var(--ink-soft);line-height:1.95;margin-top:14px}.article-body li{color:var(--ink-soft);margin-block:9px;line-height:1.85}.article-body ul,.article-body ol{padding-left:1.5em;margin-block:16px}.article-body strong{color:var(--ink);font-weight:600}.article-body a{text-decoration-color:var(--purple);overflow-wrap:anywhere}.article-body .muted{color:var(--muted);font-size:14px}.note{background:var(--soft);border-radius:18px;padding:22px 24px;margin-block:24px;color:var(--ink-soft)}.note p:first-child{margin-top:0}.note p{font-size:15px}.steps{counter-reset:step;list-style:none!important;padding:0!important;margin:28px 0!important}.steps>li{counter-increment:step;position:relative;padding:3px 0 26px 48px;border-bottom:1px solid var(--line);margin-bottom:22px}.steps>li::before{content:counter(step);position:absolute;left:0;top:2px;width:28px;height:28px;border-radius:50%;background:var(--soft);color:var(--ink-soft);display:grid;place-items:center;font-size:13px;font-variant-numeric:tabular-nums}.steps h2{font-size:19px;margin:0 0 8px}.steps p{font-size:15px;margin:0}.flow-list{margin:24px 0;padding:0;list-style:none}.flow-list li{display:grid;grid-template-columns:130px 1fr;gap:20px;padding:16px 0;border-bottom:1px solid var(--line);margin:0}.flow-list strong{font-size:15px}.flow-list span{font-size:15px;line-height:1.8}.table-wrap{overflow-x:auto;margin:24px 0}table{border-collapse:collapse;width:100%;font-size:14px;text-align:left}th,td{padding:14px 12px;border-bottom:1px solid var(--line);vertical-align:top}th{font-weight:500;color:var(--ink)}td{color:var(--ink-soft);min-width:150px}th:first-child,td:first-child{padding-left:0}.not-found{padding-block:100px 130px;max-width:700px}.not-found h1{font-size:42px}.not-found p{margin:20px 0 32px;color:var(--ink-soft)}.small-label{font-size:12px;color:var(--muted)}@media(max-width:950px){.hero{gap:40px;padding-top:40px}.hero h1{font-size:48px}.hero-description{font-size:17px}.demo{padding:24px}.privacy-block{gap:48px}.features{gap:30px}}@media(max-width:720px){.shell{width:calc(100% - 40px)}.site-header{padding-block:20px;gap:16px}.brand-icon{width:36px;height:36px;border-radius:9px}.brand-name{font-size:19px}.site-nav{gap:20px;font-size:13px}.site-nav .desktop-nav{display:none}.hero{grid-template-columns:1fr;padding:42px 0 64px;gap:46px}.hero h1{font-size:clamp(39px,8.8vw,58px)}.hero-description{max-width:28em;margin-top:22px}.eyebrow{margin-bottom:20px}.hero-actions{margin-top:28px}.hero-note{margin-top:16px}.demo-wrap{max-width:470px;width:100%;margin-inline:auto}.demo{padding:26px 24px}.demo-body{font-size:15px}.section{padding-block:48px}.section-heading{display:block;margin-bottom:28px}.section-heading h2,.privacy-block h2{font-size:27px}.section-heading>p{margin-top:16px}.features{grid-template-columns:1fr;gap:30px}.feature{padding-bottom:28px;border-bottom:1px solid var(--soft)}.feature:last-child{border:0;padding-bottom:0}.feature-label{margin-bottom:10px}.feature h3{font-size:19px;margin-bottom:8px}.privacy-block{grid-template-columns:1fr;gap:22px}.privacy-block h2{max-width:none}.invitation{display:block;padding:28px 24px;margin-bottom:42px}.invitation .button{margin-top:24px}.invitation h2{font-size:23px}.site-footer{display:block;padding:24px 0 32px}.footer-links{justify-content:flex-start;margin-top:20px;gap:10px 20px}.page-intro,.article-shell .page-intro{padding:40px 0 24px}.page-intro h1{font-size:34px}.page-intro>p:last-child{font-size:16px;margin-top:18px}.article-shell{padding-bottom:52px}.article-body h2{font-size:21px;margin-top:32px}.flow-list li{grid-template-columns:1fr;gap:5px}.note{padding:18px 20px}.steps>li{padding-left:42px}.steps h2{font-size:18px}.not-found{padding:72px 0 96px}.not-found h1{font-size:34px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}.button:active{transform:none}}@media print{body{background:#fff;color:#111;font-size:12pt}.site-header,.site-footer,.skip-link,.hero-actions,.invitation{display:none}.shell{width:100%}.article-shell{max-width:none;padding:0}.page-intro{padding-top:0!important}.note{border:1px solid #ddd;background:transparent}.article-body h2{break-after:avoid}a{color:inherit}.demo{box-shadow:none}}