@font-face {
  font-family: "Say Title";
  src: url("../assets/fonts/say-title-subset.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
:root {
  color-scheme: light;
  --paper: #f7f8f2;
  --ink: #0c2618;
  --muted: #506658;
  --line: #cbd5c7;
  --lime: #d9f2a9;
  --soft: #eef2e8;
  --sans: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --title: "Say Title", "PingFang SC", sans-serif;
  --mono: "SFMono-Regular", Menlo, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 40px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
button,input { font: inherit; }
a { color: inherit; text-decoration: none; }
button,a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: wait; }
button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible { outline: 3px solid #6e913f; outline-offset: 5px; }
::selection { background: var(--lime); color: var(--ink); }
.wrap { width: min(1280px, calc(100% - 112px)); margin-inline: auto; }
.site-header { width: min(1400px, calc(100% - 80px)); height: 100px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.wordmark { display: inline-flex; align-items: center; width: 115px; flex-shrink: 0; }
.wordmark img { width: 100%; height: auto; display: block; }
.site-header nav { display: flex; gap: 34px; font-size: 14px; color: var(--muted); }
.site-header nav a:hover,.text-link:hover { text-decoration: underline; text-underline-offset: 6px; }
.header-actions { display: flex; gap: 22px; align-items: center; }
.lang-toggle { border: 0; background: transparent; color: var(--ink); padding: 12px 4px; font-size: 14px; min-width: 40px; min-height: 44px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 30px; background: var(--ink); color: var(--paper); padding: 20px 26px; border: 1px solid var(--ink); font-size: 15px; transition: background .2s, transform .2s; }
.button:hover { background: #264635; transform: translateY(-2px); }
.button.small { padding: 13px 18px; gap: 20px; font-size: 14px; }
.hero { display: grid; grid-template-columns: .85fr 1.15fr; gap: 20px; align-items: center; padding-block: 76px 66px; }
.hero-copy { position: relative; z-index: 1; }
.hero h1 { font-family: var(--title); font-weight: 600; font-size: clamp(72px, 7.5vw, 110px); line-height: 1.18; letter-spacing: -.05em; margin: 0 0 28px; }
.hero h1 span { background: var(--lime); box-decoration-break: clone; -webkit-box-decoration-break: clone; padding: 0 .06em .025em 0; }
.hero-lead { font-size: clamp(18px, 1.7vw, 24px); font-weight: 600; line-height: 1.6; margin: 0 0 16px; max-width: 470px; letter-spacing: -.035em; }
.hero-sub { font-size: 16px; line-height: 1.9; color: var(--muted); max-width: 395px; margin: 0 0 30px; }
.hero-actions { display: flex; align-items: center; gap: 26px; }
.text-link { display: inline-flex; gap: 16px; align-items: center; font-size: 14px; }
.hero-foot { font-size: 12px; color: var(--muted); margin: 25px 0 0; line-height: 1.7; }
.hero-art { position: relative; margin: 0 -40px 0 -24px; min-width: 0; }
.hero-art img { width: 100%; height: auto; display: block; mix-blend-mode: multiply; }
.hero-art figcaption { margin: 8px 40px 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; line-height: 1.6; }
.principle-strip { display: flex; align-items: center; justify-content: space-between; gap: 25px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); padding-block: 25px; font-size: 13px; color: var(--muted); }
.principle-strip>div { display: flex; align-items: center; gap: 28px; font-size: 14px; color: var(--ink); }
h2 { font-family: var(--title); font-weight: 600; letter-spacing: -.035em; font-size: clamp(30px, 3.5vw, 46px); line-height: 1.4; margin: 0; }
.benefits { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; padding-block: 112px; }
.benefits-intro>p { font-size: 16px; line-height: 1.9; color: var(--muted); margin: 24px 0 30px; max-width: 340px; }
.benefits h2 { font-size: clamp(30px, 3.1vw, 42px); }
.benefit { display: grid; grid-template-columns: 30px 1fr; gap: 17px; border-top: 1px solid var(--line); padding-block: 26px; }
.benefit:first-child { border-top: 2px solid var(--ink); padding-top: 24px; }
.benefit:last-child { padding-bottom: 0; }
.index { font: 12px/1.7 var(--mono); color: var(--muted); }
.benefit .index { padding-top: 5px; }
.benefit h3 { font-family: var(--title); font-weight: 600; font-size: 22px; line-height: 1.55; letter-spacing: -.025em; margin: 0 0 12px; }
.benefit p { font-size: 15px; line-height: 1.85; color: var(--muted); margin: 0; }
.routing { background: var(--soft); padding-block: 75px; }
.routing-layout { display: grid; grid-template-columns: 1fr 1.25fr; gap: 70px; align-items: center; }
.routing h2 span { color: #5c7945; }
.routing-sub { font-size: 16px; line-height: 1.85; color: var(--muted); max-width: 380px; margin: 25px 0 0; }
.routing-map { display: grid; grid-template-columns: 1fr 160px 1fr; align-items: center; min-width: 0; }
.routing-column { display: grid; gap: 14px; }
.map-label { color: var(--muted); font: 10px/1.7 var(--mono); letter-spacing: .12em; }
.map-node { display: flex; align-items: center; justify-content: center; text-align: center; min-height: 60px; border: 1px solid #c4d1ba; background: #f7f8f2; padding: 12px; font-size: 13px; line-height: 1.65; }
.routing-center { display: flex; align-items: center; padding-top: 28px; }
.route-path { width: 20px; height: 1px; flex-shrink: 0; background: #769656; }
.routing-brand { width: 120px; background: var(--lime); padding: 26px 10px; display: flex; flex-direction: column; gap: 12px; align-items: center; text-align: center; border-top: 3px solid var(--ink); }
.routing-brand img { width: 78px; height: auto; }
.routing-brand span { font-size: 11px; line-height: 1.7; }
.how { padding-block: 100px; }
.section-heading { margin-bottom: 40px; }
.product-demo { display: grid; grid-template-columns: 215px 1fr; max-width: 1080px; margin: auto; border: 1px solid var(--line); border-top: 3px solid var(--ink); background: #fffefa; }
.demo-sidebar { padding: 30px 20px; border-right: 1px solid var(--line); display: flex; flex-direction: column; background: #edf1e7; }
.demo-sidebar .wordmark { width: 85px; margin-left: 14px; }
.demo-tabs { display: flex; flex-direction: column; gap: 8px; margin-top: 35px; }
.demo-tabs button { background: transparent; color: var(--muted); border: 1px solid transparent; padding: 14px; text-align: left; font-size: 14px; transition: background .2s; }
.demo-tabs button:hover { background: #e3ebd7; }
.demo-tabs button[aria-selected=true] { color: var(--ink); background: var(--lime); border-left: 3px solid var(--ink); }
.sidebar-caption { color: var(--muted); font-size: 12px; line-height: 1.7; margin: 50px 14px 0; }
.demo-panel { padding: 28px 40px 35px; min-width: 0; }
.demo-topbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 12px; color: var(--muted); padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.preview-label { border: 1px solid var(--line); padding: 5px 9px; font-size: 11px; }
.prompt { padding: 26px 0 25px; min-height: 160px; }
.prompt-label { color: var(--muted); font-size: 12px; }
.prompt p { font-size: 19px; line-height: 1.7; margin: 12px 0 0; letter-spacing: -.015em; }
.prompt em { font-style: italic; }
.demo-journey { display: grid; gap: 10px; }
.journey-item { display: flex; gap: 16px; align-items: center; padding: 17px; background: #f1f4ea; border: 1px solid #d9e1d0; }
.journey-icon { display: grid; place-items: center; flex-shrink: 0; width: 34px; height: 34px; border: 1px solid #b9c8ac; color: var(--ink); font-size: 21px; }
.journey-item>div>span { font-size: 12px; color: var(--muted); }
.journey-item p { font-size: 14px; line-height: 1.7; margin: 4px 0 0; }
.journey-step { margin-left: auto; color: #6b805b; font: 11px var(--mono); }
.journey-item.result { background: #e6f0d5; border-color: #b3cc94; }
.result .journey-icon { background: var(--lime); border-color: #a8c585; }
.chain { display: grid; grid-template-columns: repeat(4,1fr); gap: 36px; margin-top: 55px; }
.stage { padding-top: 22px; border-top: 1px solid var(--line); }
.stage h3 { font-family: var(--title); font-size: 20px; font-weight: 600; margin: 16px 0 14px; }
.stage p { font-size: 15px; line-height: 1.85; color: var(--muted); margin: 0; }
.vision { display: grid; grid-template-columns: 1fr 1.2fr; align-items: center; gap: 90px; padding-bottom: 100px; }
.sharing-diagram { min-height: 365px; background: var(--soft); padding: 30px 36px; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.share-person { font-family: var(--title); font-size: 22px; }
.share-agent { display: flex; align-items: center; justify-content: center; gap: 20px; margin: 20px 0; width: 100%; }
.share-agent strong { background: var(--lime); font-weight: 500; padding: 18px; font-size: 15px; text-align: center; }
.share-friends { display: flex; justify-content: space-between; gap: 20px; width: 100%; }
.share-friends>span { width: 46%; text-align: center; padding: 16px; background: var(--paper); border-top: 2px solid #9fb488; font-size: 14px; }
.sharing-diagram>p { color: var(--muted); font-size: 12px; text-align: center; line-height: 1.8; margin: 25px 0 0; }
.vision-copy>p { font-size: 16px; line-height: 1.9; color: var(--muted); margin-top: 26px; }
.waitlist { background: var(--ink); color: var(--paper); padding-block: 80px; }
.waitlist-layout { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 80px; }
.waitlist h2 { color: var(--lime); font-size: 56px; line-height: 1.4; }
.waitlist-signature { display: block; color: #c6d1bd; font-size: 15px; margin-top: 24px; }
.wl-fields { display: flex; gap: 8px; border-bottom: 1px solid #789365; padding-bottom: 12px; }
.wl-fields input { width: 100%; min-width: 0; background: transparent; color: var(--paper); border: 0; padding: 16px 0; font-size: 16px; outline-offset: 0; }
.wl-fields input::placeholder { color: #b8c7aa; }
.wl-fields button { display: flex; align-items: center; justify-content: center; gap: 24px; border: 0; background: var(--lime); color: var(--ink); white-space: nowrap; padding: 16px 21px; font-size: 14px; }
.wl-fields button:hover { background: #e7f7c9; }
.wl-fields button:disabled { opacity: .6; }
.wl-msg { min-height: 28px; font-size: 14px; line-height: 1.6; margin: 14px 0 0; }
.wl-msg.err { color: #ffd0b9; }
.wl-msg.ok { color: var(--lime); }
.contact { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 60px; padding-block: 80px; border-bottom: 1px solid var(--line); }
.contact-zh { display: flex; justify-content: flex-end; gap: 18px; }
.contact-zh figure { width: 170px; margin: 0; padding: 13px; border: 1px solid var(--line); background: #fff; }
.contact-zh img { display: block; width: 100%; height: auto; aspect-ratio: 1; object-fit: contain; }
.contact-zh figcaption { margin-top: 12px; text-align: center; font-size: 13px; font-weight: 600; }
.contact-en a { display: flex; align-items: center; justify-content: space-between; gap: 18px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); padding: 28px 0; font-size: 15px; }
.contact-en a:hover strong { text-decoration: underline; text-underline-offset: 5px; }
.contact-en strong { font-size: clamp(19px, 2.4vw, 28px); }
.contact-en a>span:last-child { font-size: 25px; }
html[lang=zh-CN] .contact-en,html[lang=en] .contact-zh { display: none; }
footer { display: flex; align-items: center; gap: 35px; padding-block: 32px; font-size: 12px; color: var(--muted); }
footer .wordmark { width: 95px; margin-right: auto; }
.sr-only,.skip-link:not(:focus) { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link:focus { position: fixed; top: 15px; left: 15px; z-index: 10; background: var(--lime); padding: 15px; }
.demo-panel.changing .demo-journey { animation: arrive .3s both; }
@keyframes arrive { from { opacity: .5; translate: 0 6px; } to { opacity: 1; translate: 0 0; } }
html[lang=en] .hero h1 { font-size: clamp(62px, 6.1vw, 88px); }
html[lang=en] .routing h2 { font-size: clamp(30px, 2.8vw, 40px); }
@media(max-width:1150px) {
  .wrap { width: calc(100% - 64px); }
  .hero { gap: 15px; padding-block: 65px; }
  .hero h1 { font-size: 84px; }
  .hero-art { margin-inline: -12px; }
  .hero-actions { gap: 18px; }
  .text-link { font-size: 13px; gap: 8px; }
  .benefits { gap: 50px; }
  .routing-layout { gap: 40px; }
  .routing-map { grid-template-columns: 1fr 120px 1fr; }
  .routing-brand { width: 96px; }
  .route-path { width: 12px; }
  .map-node { font-size: 12px; padding: 10px 7px; }
  .task-row { grid-template-columns: 150px 1fr 42px; }
  .vision,.waitlist-layout { gap: 45px; }
}
@media(max-width:850px) {
  .site-header { width: calc(100% - 48px); height: 84px; }
  .site-header nav { gap: 18px; font-size: 13px; }
  .header-actions { gap: 12px; }
  .hero { grid-template-columns: 1fr 1fr; padding-block: 55px; }
  .hero h1 { font-size: 68px; }
  .hero-art { margin: 0 -15px; }
  .hero-art figcaption { margin: 8px 20px 0; font-size: 11px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 22px; }
  .hero-lead { font-size: 19px; }
  .principle-strip { flex-wrap: wrap; gap: 16px; }
  .benefits { grid-template-columns: 1fr; gap: 35px; padding-block: 75px; }
  .benefits-intro>p { max-width: 520px; }
  .benefit-list { display: grid; grid-template-columns: 1fr; }
  .routing-layout { grid-template-columns: 1fr; gap: 36px; }
  .routing-map { grid-template-columns: 1fr 190px 1fr; max-width: 660px; width: 100%; margin: auto; }
  .routing-brand { width: 130px; }
  .route-path { width: 30px; }
  .routing-sub { max-width: 580px; }
  .map-node { font-size: 14px; }
  .product-demo { grid-template-columns: 165px 1fr; }
  .demo-sidebar { padding: 25px 12px; }
  .demo-panel { padding: 22px; }
  .chain { grid-template-columns: 1fr 1fr; gap: 28px; }
  .vision { gap: 30px; }
  .sharing-diagram { padding: 25px 20px; }
  .share-agent { gap: 10px; }
  .share-agent strong { font-size: 13px; padding: 14px; }
  .waitlist-layout { grid-template-columns: 1fr; gap: 36px; }
  .waitlist-form { max-width: 650px; }
  .contact { grid-template-columns: 1fr; gap: 28px; padding-block: 60px; }
  .contact-zh { justify-content: flex-start; }
  html[lang=en] .hero h1 { font-size: 54px; }
}
@media(max-width:600px) {
  html { scroll-padding-top: 24px; }
  .wrap { width: calc(100% - 40px); }
  .site-header { width: calc(100% - 40px); gap: 12px; height: 76px; }
  .site-header nav { display: none; }
  .wordmark { width: 92px; }
  .button.small { font-size: 12px; padding: 12px; gap: 12px; }
  .header-actions { gap: 10px; }
  .hero { grid-template-columns: 1fr; padding-block: 40px 26px; gap: 8px; }
  .hero h1 { font-size: clamp(68px, 19vw, 100px); line-height: 1.2; margin-bottom: 22px; }
  .hero-lead { font-size: 18px; margin-bottom: 13px; }
  .hero-sub { font-size: 15px; line-height: 1.8; margin-bottom: 24px; }
  .hero-actions { flex-direction: row; align-items: center; gap: 12px; }
  .hero-actions .button { padding: 16px 13px; gap: 10px; font-size: 13px; white-space: nowrap; }
  .hero-actions .text-link { font-size: 12px; white-space: nowrap; }
  .hero-foot { margin-top: 21px; font-size: 11px; }
  .hero-art { margin: 0 -12px; }
  .hero-art figcaption { margin: 0 14px; padding-top: 14px; font-size: 12px; }
  .principle-strip { padding-block: 20px; font-size: 12px; }
  .principle-strip>div { width: 100%; justify-content: space-between; gap: 8px; font-size: 12px; line-height: 1.7; }
  .benefits { padding-block: 60px; gap: 28px; }
  .benefits h2,h2 { font-size: 30px; }
  .benefits-intro>p { font-size: 15px; margin: 18px 0 24px; }
  .benefit { grid-template-columns: 23px 1fr; gap: 10px; padding-block: 24px; }
  .benefit h3 { font-size: 21px; }
  .benefit p { font-size: 15px; }
  .routing { padding-block: 50px; }
  .routing-layout { gap: 25px; }
  .routing-sub { font-size: 15px; }
  .routing-map { grid-template-columns: 1fr 104px 1fr; }
  .routing-column { gap: 10px; }
  .map-label { font-size: 9px; }
  .map-node { font-size: 11px; min-height: 57px; padding: 8px 5px; }
  .routing-brand { width: 88px; padding: 23px 7px; }
  .routing-brand img { width: 65px; }
  .routing-brand span { font-size: 10px; }
  .route-path { width: 8px; }
  .how { padding-block: 60px; }
  .section-heading { margin-bottom: 30px; }
  .product-demo { display: block; }
  .demo-sidebar { padding: 18px 15px; border-right: 0; border-bottom: 1px solid var(--line); }
  .demo-sidebar .wordmark { width: 72px; margin-left: 0; }
  .demo-tabs { flex-direction: row; gap: 5px; margin-top: 18px; }
  .demo-tabs button { text-align: center; flex: 1; padding: 11px 5px; font-size: 12px; line-height: 1.6; }
  .demo-tabs button[aria-selected=true] { border-left: 1px solid transparent; border-bottom: 2px solid var(--ink); }
  .sidebar-caption { display: none; }
  .demo-panel { padding: 20px 16px; }
  .demo-topbar { padding-bottom: 15px; }
  .prompt { padding-block: 22px; min-height: 168px; }
  .prompt p { font-size: 16px; }
  .journey-item { padding: 13px 10px; gap: 10px; }
  .journey-item p { font-size: 12px; }
  .journey-item>div>span { font-size: 11px; }
  .journey-icon { width: 28px; height: 28px; font-size: 18px; }
  .journey-step { font-size: 10px; }
  .chain { gap: 24px; margin-top: 36px; }
  .stage h3 { font-size: 18px; }
  .stage p { font-size: 14px; }
  .vision { grid-template-columns: 1fr; gap: 32px; padding-bottom: 60px; }
  .sharing-diagram { min-height: 300px; padding: 28px; }
  .vision-copy>p { font-size: 15px; }
  .waitlist { padding-block: 55px; }
  .waitlist h2 { font-size: 46px; }
  .waitlist-signature { font-size: 14px; }
  .wl-fields { gap: 8px; }
  .wl-fields button { padding: 14px 13px; font-size: 12px; gap: 12px; }
  .wl-fields input { font-size: 14px; }
  .contact { padding-block: 55px; }
  .contact-zh { gap: 12px; }
  .contact-zh figure { width: min(50%, 170px); padding: 10px; }
  footer { gap: 18px; flex-wrap: wrap; padding-block: 25px; }
  footer .wordmark { width: 90px; }
  html[lang=en] .hero h1 { font-size: clamp(53px, 15.5vw, 80px); }
  html[lang=en] .hero-lead { font-size: 18px; }
  html[lang=en] .principle-strip>div { align-items: flex-start; font-size: 11px; }
  html[lang=en] .demo-tabs button { font-size: 11px; }
}
@media(max-width:360px) {
  .contact-zh { flex-direction: column; }
  .contact-zh figure { width: 170px; }
}
@media(prefers-reduced-motion:reduce) {
  html { scroll-behavior: auto; }
  *,*:before,*:after { animation: none!important; transition: none!important; }
}