:root {
  color-scheme: light;
  --bg: #fbf5fb;
  --surface: #fffafd;
  --ink: #2b183b;
  --muted: #685773;
  --purple: #7851a9;
  --purple-deep: #60358f;
  --lilac: #ede1f8;
  --line: #dfd0ea;
  --orange: #f97316;
  --orange-ink: #a93f09;
  --contact: #2a173f;
  --white: #fffafd;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; scrollbar-color: var(--purple) var(--lilac); }
body { margin: 0; color: var(--ink); background: var(--bg); font-size: 17px; line-height: 1.65; }
::selection { color: var(--white); background: var(--purple-deep); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .24em; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--orange-ink); outline-offset: 5px; }
img { max-width: 100%; height: auto; display: block; }
svg { width: 24px; height: 24px; flex: 0 0 24px; }
h1, h2, h3, p, figure, blockquote { margin: 0; }
h1, h2, h3 { text-wrap: balance; }
h2 { font-size: clamp(32px, 3.5vw, 52px); line-height: 1.12; letter-spacing: -.035em; font-weight: 760; }
h3 { font-size: 23px; line-height: 1.25; letter-spacing: -.02em; }
p { text-wrap: pretty; }
.wrap { width: min(1200px, calc(100% - 96px)); margin-inline: auto; }
.section-space { padding-block: 104px; }
.section-lead { color: var(--muted); font-size: 19px; line-height: 1.65; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: fixed; top: -100px; left: 18px; z-index: 10; padding: 10px 20px; color: var(--white); background: var(--purple-deep); }
.skip-link:focus { top: 10px; }
.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 102px; gap: 24px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 23px; font-weight: 800; line-height: 1.2; text-decoration: none; white-space: nowrap; }
.brand img { border-radius: 12px; }
.brand-online { font-weight: 430; color: var(--muted); }
.main-nav { display: flex; gap: 28px; font-size: 14px; font-weight: 650; }
.main-nav a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
.main-nav a:hover { color: var(--purple); }
.languages { display: flex; padding: 4px; gap: 2px; border: 1px solid var(--line); border-radius: 12px; }
.languages a { min-width: 43px; min-height: 38px; display: grid; place-items: center; padding: 4px 9px; border-radius: 8px; text-decoration: none; font-size: 12px; font-weight: 750; }
.languages a[aria-current] { color: var(--white); background: var(--purple); }
.languages a:not([aria-current]):hover { background: var(--lilac); }
.hero { display: grid; grid-template-columns: 1.23fr 1fr; gap: 52px; align-items: center; padding-block: 80px 64px; }
h1 { font-size: clamp(42px, 4.9vw, 69px); font-weight: 800; letter-spacing: -.04em; line-height: 1.08; }
.hero-line { display: block; }
.hero-line-1 { color: var(--purple); }
.hero-line-2 { color: var(--orange-ink); }
.hero-lead { max-width: 580px; margin-top: 30px; color: var(--muted); font-size: 18px; line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 24px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 22px; min-height: 57px; padding: 16px 22px; border-radius: 12px; font-size: 15px; line-height: 1.3; font-weight: 750; text-decoration: none; transition: background-color .2s ease-out, color .2s ease-out; }
.button-primary { background: var(--orange); color: #251438; }
.button-primary:hover { background: #fb923c; }
.text-link { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-weight: 700; font-size: 15px; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.text-link svg { width: 20px; height: 20px; flex-basis: 20px; }
.portrait-frame { position: relative; border-radius: 16px; overflow: hidden; background: var(--lilac); }
.portrait-frame > img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.portrait-signature { position: absolute; left: 16px; right: 16px; bottom: 16px; padding: 17px 20px; color: #2b183b; background: #fffafd; border-radius: 12px; }
.portrait-signature b { display: block; font-size: 20px; font-weight: 760; letter-spacing: -.02em; line-height: 1.3; }
.portrait-signature span { display: block; font-size: 12px; margin-top: 5px; color: #685773; }
.founder-portrait figcaption { font-size: 12px; color: var(--muted); margin-top: 13px; max-width: 44ch; }
.opening-line { padding-block: 26px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: 15px; color: var(--muted); }
.opening-line span:first-child { color: var(--purple-deep); font-weight: 750; }
.product-section { background: var(--surface); }
.product-grid { display: grid; grid-template-columns: 1fr .8fr; gap: 100px; align-items: start; }
.product-copy { padding-top: 52px; }
.product-copy > .section-lead { margin-top: 26px; }
.product-links { display: flex; gap: 30px; margin-top: 24px; color: var(--purple-deep); }
.small-note { margin-top: 8px; font-size: 12px; color: var(--muted); }
.chat-detail { border-top: 1px solid var(--line); margin-top: 56px; padding-top: 29px; }
.chat-detail > svg { width: 34px; height: 34px; color: var(--purple); margin-bottom: 17px; }
.chat-detail h3 { max-width: 23ch; }
.chat-detail p { margin-top: 14px; font-size: 15px; color: var(--muted); }
.product-demo { min-width: 0; }
.feature-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 28px; justify-content: center; }
.feature-tabs a { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 11px 18px; color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 650; border-bottom: 2px solid transparent; }
.feature-tabs a[aria-selected="true"] { color: var(--purple-deep); border-bottom-color: var(--purple); }
.feature-tabs a:hover { color: var(--purple); }
.feature-panel[hidden] { display: none; }
.screen-frame { width: min(100%, 286px); margin-inline: auto; overflow: hidden; border-radius: 16px; box-shadow: 0 18px 48px #4e2b6f20; }
.screen-frame img { width: 100%; height: auto; }
.screen-description { margin-top: 26px; }
.screen-description h3 { font-size: 21px; }
.screen-description p { margin-top: 10px; color: var(--muted); font-size: 15px; }
.demo-note { font-size: 11px; color: var(--muted); margin-top: 19px; max-width: 52ch; }
.story-section { border-top: 1px solid var(--line); }
.story-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; }
.founder-place { margin-top: 27px; color: var(--muted); font-size: 14px; }
.story-body > p { margin-bottom: 23px; font-size: 18px; }
.story-body > p:first-child { color: var(--purple-deep); font-weight: 550; }
blockquote { margin-top: 53px; max-width: 390px; }
blockquote p { color: var(--purple); font-size: 31px; line-height: 1.22; letter-spacing: -.025em; font-weight: 650; }
blockquote cite { display: block; margin-top: 17px; color: var(--muted); font-size: 12px; font-style: normal; }
.story-body > .ai-note { margin: 32px 0 0; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.partnership-section { background: var(--lilac); }
.partner-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; align-items: start; }
.partner-heading .section-lead { font-size: 18px; }
.proposal-status { display: flex; align-items: center; gap: 9px; margin-top: 32px; font-size: 12px; color: var(--purple-deep); }
.proposal-status > span { width: 7px; height: 7px; border-radius: 50%; background: var(--purple); }
.formats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 45px; margin-top: 40px; padding-block: 35px 40px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.formats h3 { font-size: 25px; }
.formats p { margin-top: 17px; color: var(--muted); font-size: 15px; }
.partnership-exchange { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; margin-top: 40px; }
.partnership-exchange h3 { font-size: 18px; }
.partnership-exchange p { font-size: 15px; color: var(--muted); margin-top: 13px; }
.other-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; }
.other-grid h2 { max-width: 14ch; }
.other-options { margin: 28px 0 0; padding: 0; list-style: none; }
.other-options li { padding-block: 16px; border-bottom: 1px solid var(--line); font-size: 16px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.other-options svg { color: var(--purple); }
.contact-section { background: var(--contact); color: var(--white); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; align-items: center; }
.contact-grid h2 { max-width: 16ch; }
.contact-grid > div:first-child > p { margin-top: 24px; color: #decee9; font-size: 18px; }
.email-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 17px; border-bottom: 1px solid #7b608e; font-size: clamp(19px, 2.6vw, 33px); line-height: 1.3; font-weight: 650; letter-spacing: -.025em; text-decoration: none; white-space: nowrap; }
.email-link:hover { color: #ffac71; }
.contact-action .copy-button { display: inline-flex; align-items: center; gap: 10px; background: transparent; border: 0; padding: 12px 0; min-height: 44px; color: #f2e6fc; cursor: pointer; font-size: 12px; }
.contact-action .copy-button[hidden] { display: none; }
.copy-button svg { width: 17px; height: 17px; flex-basis: 17px; }
.copy-button:hover { color: #ffac71; }
.copy-status { font-size: 12px; color: #ffba88; }
.copy-status:not(:empty) { margin-block: 8px; }
.contact-prompt { margin-top: 20px; color: #decee9; font-size: 13px; max-width: 45ch; }
.contact-section :focus-visible { outline-color: #ffba88; }
.site-footer { display: flex; min-height: 130px; align-items: center; gap: 30px; justify-content: space-between; }
.site-footer .brand { font-size: 16px; gap: 9px; }
.site-footer .brand img { border-radius: 9px; }
.site-footer p { color: var(--muted); font-size: 12px; }
.back-top { display: inline-flex; align-items: center; gap: 9px; min-height: 44px; font-size: 12px; text-decoration: none; }
.back-top svg { transform: rotate(-90deg); width: 18px; height: 18px; flex-basis: 18px; }
html[lang="zh-Hans"] h1 { font-size: clamp(33px, 3.7vw, 53px); line-height: 1.28; letter-spacing: -.025em; }
html[lang="zh-Hans"] h2 { line-height: 1.3; letter-spacing: -.025em; }
html[lang="zh-Hans"] .hero-lead, html[lang="zh-Hans"] .section-lead, html[lang="zh-Hans"] .story-body > p { line-height: 1.9; }

@media (min-width: 980px) and (prefers-reduced-motion: no-preference) {
  .founder-portrait { animation: portrait-arrive 900ms cubic-bezier(.16, 1, .3, 1) both; }
  @keyframes portrait-arrive { from { transform: translateY(16px); clip-path: inset(0 0 5% 0 round 16px); } to { transform: translateY(0); clip-path: inset(0 round 16px); } }
}
@media (max-width: 1199px) {
  .wrap { width: calc(100% - 64px); }
  .hero { gap: 32px; padding-top: 60px; }
  h1 { font-size: clamp(42px, 5.3vw, 64px); }
  .main-nav { gap: 20px; font-size: 13px; }
  .hero-actions { gap: 15px; }
  .product-grid, .story-grid, .partner-heading, .partnership-exchange, .other-grid, .contact-grid { gap: 60px; }
  .formats { gap: 28px; }
}
@media (max-width: 979px) {
  .main-nav { display: none; }
  .hero { grid-template-columns: 1.18fr 1fr; gap: 28px; padding-block: 56px 45px; }
  h1 { font-size: clamp(37px, 5.1vw, 50px); }
  .hero-lead { font-size: 16px; margin-top: 24px; }
  .hero-actions { margin-top: 25px; gap: 10px; }
  .button { padding: 14px 17px; gap: 15px; font-size: 14px; min-height: 52px; }
  .text-link { font-size: 14px; }
  .portrait-signature { left: 10px; right: 10px; bottom: 10px; padding: 13px; }
  .portrait-signature b { font-size: 16px; }
  .portrait-signature span { font-size: 10px; }
  .opening-line { font-size: 12px; }
  .section-space { padding-block: 78px; }
  .product-grid, .story-grid, .partner-heading, .partnership-exchange, .other-grid, .contact-grid { gap: 42px; }
  .section-lead { font-size: 17px; }
  .product-copy { padding-top: 16px; }
  .product-links { gap: 18px; }
  .feature-tabs a { padding-inline: 10px; font-size: 12px; }
  .story-body > p { font-size: 16px; }
  .formats h3 { font-size: 21px; }
  .email-link { font-size: 22px; }
  html[lang="zh-Hans"] h1 { font-size: 32px; }
}
@media (max-width: 767px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { min-height: 80px; gap: 12px; }
  .brand { gap: 9px; font-size: 19px; }
  .brand > img { width: 35px; height: 35px; border-radius: 10px; }
  .languages { padding: 3px; border-radius: 10px; }
  .languages a { min-width: 36px; min-height: 37px; padding-inline: 7px; font-size: 11px; }
  .hero { grid-template-columns: 1fr; gap: 36px; padding-block: 43px 32px; }
  h1 { font-size: clamp(39px, 7.1vw, 62px); }
  .hero-lead { font-size: 17px; max-width: 58ch; margin-top: 24px; }
  .hero-actions { gap: 18px; margin-top: 27px; }
  .button { min-height: 55px; padding: 16px 20px; }
  .founder-portrait { width: 100%; max-width: 480px; margin-inline: auto; }
  .portrait-frame > img { aspect-ratio: 1.15; object-fit: cover; object-position: center 38%; }
  .portrait-signature { left: 13px; right: 13px; bottom: 13px; padding: 15px 17px; }
  .portrait-signature b { font-size: 20px; }
  .portrait-signature span { font-size: 11px; }
  .founder-portrait figcaption { margin-top: 10px; font-size: 11px; }
  .opening-line { align-items: flex-start; justify-content: flex-start; flex-wrap: wrap; gap: 5px 16px; padding-block: 21px; font-size: 13px; }
  .section-space { padding-block: 62px; }
  h2 { font-size: clamp(32px, 6vw, 44px); }
  .product-grid, .story-grid, .partner-heading, .partnership-exchange, .other-grid, .contact-grid { grid-template-columns: 1fr; gap: 35px; }
  .product-copy { padding-top: 0; }
  .product-copy > .section-lead { margin-top: 22px; }
  .product-links { margin-top: 20px; gap: 30px; }
  .chat-detail { margin-top: 32px; padding-top: 23px; }
  .chat-detail > svg { float: left; margin-right: 16px; width: 28px; height: 28px; }
  .chat-detail h3 { font-size: 20px; max-width: 100%; }
  .chat-detail p { clear: both; padding-top: 7px; }
  .product-demo { max-width: 460px; width: 100%; margin-inline: auto; }
  .feature-tabs a { padding-inline: 22px; font-size: 14px; }
  .screen-frame { width: min(100%, 286px); }
  .screen-description { margin-top: 24px; }
  .founder-place { margin-top: 22px; }
  blockquote { margin-top: 30px; }
  blockquote p { font-size: 27px; }
  .story-body > p { margin-bottom: 20px; font-size: 17px; }
  .partner-heading .section-lead { font-size: 17px; }
  .proposal-status { margin-top: 25px; }
  .formats { grid-template-columns: 1fr; margin-top: 28px; padding-block: 28px; gap: 28px; }
  .formats h3 { font-size: 24px; }
  .formats p { margin-top: 10px; font-size: 16px; }
  .partnership-exchange { margin-top: 30px; gap: 27px; }
  .partnership-exchange h3 { font-size: 19px; }
  .partnership-exchange p { font-size: 16px; }
  .other-grid h2, .contact-grid h2 { max-width: 100%; }
  .other-options { margin-top: 18px; }
  .contact-grid { gap: 29px; }
  .contact-grid > div:first-child > p { font-size: 17px; }
  .email-link { font-size: clamp(20px, 6vw, 31px); padding-block: 15px; }
  .contact-prompt { margin-top: 17px; font-size: 14px; }
  .site-footer { min-height: 160px; flex-wrap: wrap; gap: 15px; padding-block: 28px; }
  .site-footer .brand { flex: 1; font-size: 16px; }
  .site-footer p { flex-basis: 100%; order: 3; }
  html[lang="zh-Hans"] h1 { font-size: clamp(29px, 5.7vw, 44px); }
}
@media (max-width: 419px) {
  .wrap { width: calc(100% - 32px); }
  .site-header { gap: 10px; }
  .brand { gap: 7px; font-size: 17px; }
  .brand > img { width: 31px; height: 31px; }
  .languages a { min-width: 33px; padding-inline: 5px; }
  h1 { font-size: clamp(36px, 9.7vw, 41px); }
  .hero-lead { font-size: 16px; }
  .hero-actions { gap: 15px; }
  .button { font-size: 13px; padding-inline: 15px; gap: 13px; }
  .text-link { font-size: 13px; gap: 6px; }
  .portrait-signature b { font-size: 18px; }
  .portrait-signature span { font-size: 10px; }
  .portrait-signature { padding: 13px 15px; }
  .opening-line { font-size: 12px; }
  .section-space { padding-block: 54px; }
  .feature-tabs a { padding-inline: 18px; }
  .email-link { font-size: 20px; letter-spacing: -.02em; gap: 8px; }
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { color-scheme: dark; --bg: #21152d; --surface: #291b36; --ink: #f6ecfc; --muted: #c9b9d5; --purple: #c39be7; --purple-deep: #d4b3f0; --lilac: #392449; --line: #574064; --orange-ink: #ffa466; --contact: #170e21; }
  :root:not([data-theme="light"]) .languages a[aria-current] { color: #251438; }
  :root:not([data-theme="light"]) .button-primary { background: #ff974c; }
  :root:not([data-theme="light"]) .screen-frame { box-shadow: 0 18px 48px #0d07194d; }
}
html[data-theme="dark"] { color-scheme: dark; --bg: #21152d; --surface: #291b36; --ink: #f6ecfc; --muted: #c9b9d5; --purple: #c39be7; --purple-deep: #d4b3f0; --lilac: #392449; --line: #574064; --orange-ink: #ffa466; --contact: #170e21; }
html[data-theme="dark"] .languages a[aria-current] { color: #251438; }
html[data-theme="dark"] .button-primary { background: #ff974c; }
html[data-theme="dark"] .screen-frame { box-shadow: 0 18px 48px #0d07194d; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}