:root {
  --bg: oklch(1 0 0);
  --ink: oklch(0.22 0.015 28);
  --primary: oklch(0.489 0.19 28.3);
  --surface: oklch(0.96 0 0);
  --muted: oklch(0.44 0.012 28);
  --accent: oklch(0.9 0.06 160);
  --line: oklch(0.82 0 0);
  font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 2rem;
}
body {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
}
a {
  color: inherit;
  text-underline-offset: 0.25em;
  overflow-wrap: anywhere;
}
a:hover {
  text-decoration-thickness: 2px;
}
a:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 5px;
}
.wrap {
  width: min(1160px, calc(100% - 3rem));
  margin-inline: auto;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding-block: 1.5rem;
}
.wordmark {
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  text-decoration: none;
}
.wordmark span {
  font-size: 0.75rem;
  margin-left: 0.8rem;
  color: var(--muted);
}
nav {
  display: flex;
  gap: 1.6rem;
  font-size: 0.9rem;
}
.skip {
  position: fixed;
  left: 1rem;
  top: -10rem;
  background: var(--bg);
  padding: 1rem;
  z-index: 1;
}
.skip:focus {
  top: 1rem;
}
.hero {
  background: var(--primary);
  color: var(--bg);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: clamp(2rem, 6vw, 6rem);
  padding-block: clamp(2.5rem, 7vw, 6rem);
}
h1,
h2,
h3 {
  line-height: 1.25;
  text-wrap: balance;
}
h1 {
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  letter-spacing: -0.035em;
  margin: 0.45em 0;
}
h2 {
  font-size: clamp(1.9rem, 3.2vw, 3rem);
  letter-spacing: -0.025em;
  margin: 0 0 1.3rem;
}
h3 {
  font-size: 1.2rem;
  margin: 0 0 0.65rem;
}
p {
  max-width: 70ch;
  text-wrap: pretty;
}
.status {
  font-size: 0.95rem;
  max-width: 44ch;
}
.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.9;
}
.button {
  display: inline-flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: center;
  background: var(--bg);
  color: var(--primary);
  padding: 0.75rem 1.2rem;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 700;
  margin-top: 1rem;
}
.hero a:focus-visible {
  outline-color: var(--bg);
}
.conversation {
  background: var(--bg);
  color: var(--ink);
  padding: clamp(1.4rem, 3vw, 2.5rem);
  border-radius: 12px;
  transform: rotate(1deg);
}
.demo-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 2rem;
}
.bubble {
  background: var(--surface);
  padding: 1rem 1.2rem;
  border-radius: 12px;
  max-width: 90%;
  margin: 1rem 0;
}
.bubble.person {
  background: var(--accent);
  margin-left: auto;
  width: fit-content;
}
.conversation-note {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 2rem 0 0;
}
.flow {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  padding-block: 6rem;
}
.flow ol {
  padding: 0 0 0 1.8rem;
  margin: 0;
}
.flow li {
  padding-left: 0.65rem;
  margin-bottom: 2rem;
}
.flow li:last-child {
  margin-bottom: 0;
}
.flow li::marker {
  color: var(--primary);
  font-weight: 800;
}
.flow p {
  margin: 0;
  color: var(--muted);
}
.payment {
  background: var(--surface);
}
.payment-inner {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  padding-block: 4rem;
}
.payment p:first-child {
  margin-top: 0;
}
.payment a {
  color: var(--primary);
  font-weight: 700;
}
.connect {
  padding-block: 6rem;
}
.section-intro {
  max-width: 760px;
}
.endpoint {
  font-weight: 700;
  color: var(--primary);
}
.clients {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-top: 3rem;
}
.clients article {
  border-top: 1px solid var(--line);
  padding-top: 1.7rem;
}
.clients h3 {
  font-size: 1.6rem;
}
.clients ol {
  padding-left: 1.3rem;
}
.clients li {
  padding-left: 0.3rem;
  margin-bottom: 0.85rem;
}
.security {
  background: var(--surface);
  padding: 1.2rem 1.5rem;
  max-width: none;
  margin-top: 2rem;
  border-radius: 6px;
}
.help {
  padding-bottom: 4rem;
}
.help a {
  color: var(--primary);
}
footer {
  display: flex;
  gap: 2rem;
  align-items: start;
  border-top: 1px solid var(--line);
  padding-block: 2rem;
  font-size: 0.8rem;
  color: var(--muted);
}
footer p {
  margin: 0;
}
footer p:nth-child(2) {
  flex: 1;
  max-width: 65ch;
}
.terms {
  max-width: 780px;
  padding-block: 3rem 5rem;
}
.terms h1 {
  font-size: clamp(2.1rem, 4vw, 3.3rem);
}
.terms .status {
  color: var(--primary);
}
.version {
  color: var(--muted);
}
.terms-copy p {
  margin-block: 1.8rem;
}
.terms-copy {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}
@media (max-width: 700px) {
  .wrap {
    width: calc(100% - 2rem);
  }
  header {
    align-items: start;
  }
  .wordmark {
    font-size: 1.05rem;
  }
  .wordmark span {
    display: block;
    margin: 0;
  }
  nav {
    gap: 1rem;
    font-size: 0.8rem;
  }
  .hero-inner,
  .flow,
  .payment-inner,
  .clients {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .conversation {
    transform: none;
  }
  .hero-inner {
    padding-block: 2rem 3rem;
  }
  .flow,
  .connect {
    padding-block: 3.5rem;
  }
  .payment-inner {
    padding-block: 3rem;
  }
  .clients {
    margin-top: 2rem;
  }
  footer {
    flex-wrap: wrap;
    gap: 0.8rem;
  }
  footer p:nth-child(2) {
    flex-basis: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .conversation {
    transform: none;
  }
}