:root {
  color-scheme: light dark;
  --bg: #fafbf9;
  --panel: #ffffff;
  --text: #202e25;
  --muted: #607168;
  --accent: #246344;
  --line: #dce5de;
  --soft: #edf3ee;
  --topbar: rgba(250, 251, 249, .94);
  --shadow: rgba(35, 73, 47, .08);
}
* { box-sizing: border-box; }
html { scroll-padding-top: 104px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 4px; }
::selection { background: #bde0c9; color: #173d2a; }
h1, h2, h3, p { margin: 0; }
.container { width: min(1160px, calc(100% - 80px)); margin-inline: auto; }
.skip { position: absolute; top: -100px; left: 20px; z-index: 5; padding: 10px 20px; background: var(--panel); }
.skip:focus { top: 10px; }
.topbar { position: sticky; top: 0; z-index: 3; background: var(--topbar); border-bottom: 1px solid var(--line); backdrop-filter: blur(16px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 23px; font-weight: 750; letter-spacing: -.7px; }
.mark { display: block; width: 34px; height: 36px; border-radius: 10px; object-fit: contain; }
.navigation { display: flex; align-items: center; gap: 34px; margin-left: auto; margin-right: 24px; color: var(--muted); font-size: 13px; }
.navigation a:hover, .footer nav a:hover { color: var(--accent); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 26px; min-height: 48px; padding: 10px 24px; border: 1px solid transparent; border-radius: 7px; font-size: 14px; font-weight: 600; transition: background .2s, transform .2s; }
.button:hover { transform: translateY(-2px); }
.button span { font-size: 19px; line-height: 1; }
.primary { background: var(--accent); color: white; }
.primary:hover { background: #184e33; }
.secondary { background: var(--panel); border-color: var(--line); }
.secondary:hover { background: var(--soft); }
.login { min-height: 40px; padding: 7px 19px; gap: 20px; font-size: 13px; }
.hero { display: grid; grid-template-columns: 1.12fr 1fr; align-items: center; gap: 64px; padding-block: 78px 84px; }
.eyebrow { display: flex; align-items: center; gap: 9px; font-size: 10px; font-weight: 650; letter-spacing: 1.8px; color: var(--accent); }
.dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
h1 { margin-top: 24px; font-size: clamp(42px, 4.4vw, 62px); line-height: 1.27; font-weight: 650; letter-spacing: -2px; }
h1 em { color: var(--accent); font-style: normal; }
.lead { margin-top: 26px; font-size: 16px; line-height: 1.95; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-note { display: flex; align-items: center; gap: 10px; margin-top: 22px; color: var(--muted); font-size: 11px; }
.hero-note > span:first-child { color: var(--accent); }
.note-divider { color: var(--line); padding-inline: 2px; }
.flow-illustration { background-color: var(--soft); background-image: radial-gradient(var(--line) 1px, transparent 1px); background-size: 18px 18px; border: 1px solid var(--line); border-radius: 20px; padding: 24px 30px 19px; box-shadow: 0 18px 45px var(--shadow); }
.illustration-label { display: flex; align-items: center; gap: 7px; font-size: 8px; font-weight: 650; letter-spacing: 1.3px; color: var(--accent); }
.illustration-label > span:last-child { margin-left: auto; color: var(--muted); font-size: 9px; letter-spacing: 0; }
.flow-source, .flow-destination { display: flex; align-items: center; gap: 14px; width: 88%; margin: auto; padding: 15px 18px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
.flow-source { margin-top: 25px; }
.flow-source div, .flow-destination div, .hub-heading div { display: grid; }
.flow-illustration strong { font-size: 14px; font-weight: 600; }
.flow-illustration small { color: var(--muted); font-size: 10px; }
.source-icon, .alipay-mark { display: grid; place-items: center; width: 32px; height: 34px; border-radius: 8px; background: var(--soft); color: var(--accent); font-size: 22px; }
.flow-step { margin-left: auto; font-size: 10px; color: var(--muted); }
.connector { display: flex; justify-content: center; height: 32px; color: var(--accent); font-size: 20px; }
.connector span { width: 1px; display: flex; align-items: center; justify-content: center; }
.flow-hub { padding: 23px; border-radius: 13px; background: #246344; color: white; box-shadow: 0 10px 20px var(--shadow); }
.hub-heading { display: flex; align-items: center; gap: 12px; }
.hub-heading .mark { background: rgba(255, 255, 255, .14); width: 40px; height: 42px; }
.hub-heading strong { font-size: 21px; letter-spacing: -.6px; }
.hub-heading small { color: #d0e2d5; }
.hub-dot { width: 7px; height: 7px; border-radius: 50%; background: #b7e4c6; margin-left: auto; }
.hub-features { display: flex; justify-content: space-between; margin-top: 19px; padding-top: 15px; border-top: 1px solid rgba(255,255,255,.18); color: #dcebe0; font-size: 11px; }
.alipay-mark { background: #1677ff; color: white; font-size: 20px; }
.flow-result { display: flex; align-items: center; gap: 9px; width: 95%; margin: 18px auto 0; padding: 12px 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
.flow-result strong { font-size: 11px; }
.flow-result > span:last-child { margin-left: auto; font-size: 9px; color: var(--muted); }
.check { display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; color: var(--accent); background: var(--soft); font-size: 12px; }
.illustration-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 19px; color: var(--muted); font-size: 9px; letter-spacing: 1px; }
.illustration-footer > span:last-child { font-size: 22px; color: var(--accent); line-height: 1; }
.capability-strip { border-block: 1px solid var(--line); }
.strip-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 25px; }
.strip-inner > span { font-size: 11px; color: var(--muted); }
.strip-inner > div { font-size: 13px; font-weight: 600; }
.section { padding-block: 86px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 36px; }
h2 { font-size: clamp(25px, 2.7vw, 34px); font-weight: 600; letter-spacing: -1px; line-height: 1.5; }
.section-heading h2, .developer-section h2 { margin-top: 12px; }
.section-heading > p, .developer-section p:not(.eyebrow) { color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.feature { position: relative; padding: 27px 23px; background: var(--panel); }
.feature + .feature { border-left: 1px solid var(--line); }
.feature-icon { display: grid; place-items: center; width: 39px; height: 39px; border-radius: 9px; color: var(--accent); background: var(--soft); font-size: 25px; line-height: 1; }
.feature-number { position: absolute; top: 34px; right: 23px; color: var(--muted); font-size: 10px; }
h3 { font-size: 17px; font-weight: 600; letter-spacing: -.3px; }
.feature h3 { margin-top: 25px; }
.feature p { margin-top: 12px; color: var(--muted); font-size: 13px; line-height: 1.95; }
.feature-detail { display: block; border-top: 1px solid var(--line); padding-top: 16px; margin-top: 24px; font-size: 10px; color: var(--accent); }
.getting-started { background: var(--soft); padding-block: 64px; border-block: 1px solid var(--line); }
.text-link { display: inline-flex; gap: 24px; color: var(--accent); font-size: 12px; font-weight: 600; padding-bottom: 5px; }
.text-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 60px; list-style: none; padding: 0; margin: 0; }
.step-number { display: block; padding-bottom: 15px; border-bottom: 1px solid var(--line); color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: 1px; }
.steps h3 { margin-top: 20px; }
.steps p { color: var(--muted); font-size: 13px; margin-top: 10px; max-width: 285px; }
.developer-section { display: grid; grid-template-columns: 1fr 1.2fr; gap: 80px; padding-block: 86px; align-items: center; }
.developer-section p:not(.eyebrow) { margin-top: 18px; line-height: 1.95; }
.resource-list { border-top: 1px solid var(--line); }
.resource-list a { display: flex; align-items: center; gap: 24px; padding: 24px 10px; border-bottom: 1px solid var(--line); transition: background .2s; }
.resource-list a:hover { background: var(--soft); }
.resource-index { color: var(--accent); font-size: 11px; }
.resource-list strong { display: block; font-size: 16px; font-weight: 600; }
.resource-list div > span { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }
.resource-arrow { margin-left: auto; color: var(--accent); font-size: 20px; }
.closing { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 44px 48px; background: #246344; color: white; border-radius: 13px; }
.closing .eyebrow { color: #bfd7c7; font-size: 9px; }
.closing h2 { margin-top: 10px; font-size: clamp(23px, 2.4vw, 30px); }
.closing p:not(.eyebrow) { margin-top: 10px; font-size: 13px; color: #d0e2d5; }
.closing .button { flex-shrink: 0; background: #f8fbf8; color: #246344; }
.closing .button:hover { background: #e0eee4; }
.footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 44px; }
.footer > div { display: flex; align-items: center; gap: 24px; }
.footer .brand { font-size: 19px; }
.footer .mark { width: 28px; height: 30px; border-radius: 8px; }
.footer-tagline { color: var(--muted); font-size: 11px; }
.footer nav { display: flex; gap: 26px; font-size: 11px; color: var(--muted); }
@media (prefers-color-scheme: dark) {
  :root { --bg: #121c16; --panel: #1a271e; --text: #edf3ee; --muted: #a5b7aa; --accent: #8bc4a0; --line: #2f4235; --soft: #1d2d22; --topbar: rgba(18,28,22,.94); --shadow: rgba(0,0,0,.15); }
  .primary, .mark { background: #246344; }
  .flow-illustration { background-color: #19271e; }
}
@media (max-width: 1050px) {
  .container { width: calc(100% - 48px); }
  .hero { gap: 32px; padding-block: 60px; }
  .flow-illustration { padding: 22px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature:nth-child(3) { border-left: 0; }
  .feature:nth-child(n+3) { border-top: 1px solid var(--line); }
  .feature p { min-height: 52px; }
  .steps { gap: 32px; }
  .developer-section { gap: 40px; }
}
@media (max-width: 760px) {
  .header-inner { height: 68px; gap: 15px; }
  .navigation { gap: 15px; margin-right: 0; font-size: 12px; }
  .navigation a:not(:last-child) { display: none; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 44px; }
  h1 { font-size: clamp(40px, 8vw, 58px); }
  .lead { font-size: 15px; }
  .flow-illustration { width: 100%; max-width: 470px; justify-self: center; padding: 24px 30px 19px; }
  .strip-inner { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 20px; padding-block: 22px; }
  .strip-inner > span { grid-column: 1 / -1; margin-bottom: 4px; }
  .strip-inner > div { font-size: 12px; }
  .section, .developer-section { padding-block: 52px; }
  .section-heading { display: block; margin-bottom: 28px; }
  .section-heading > p, .section-heading > a { margin-top: 16px; }
  .steps { gap: 25px; grid-template-columns: 1fr; }
  .steps li { display: grid; grid-template-columns: 38px 1fr; gap: 0 14px; }
  .steps .step-number { grid-row: span 2; padding-top: 3px; border: 0; }
  .steps h3 { margin: 0; }
  .steps p { margin-top: 6px; max-width: none; }
  .getting-started { padding-block: 45px; }
  .developer-section { grid-template-columns: 1fr; gap: 28px; }
  .closing { align-items: start; flex-direction: column; padding: 30px; gap: 24px; }
  .closing h2 { font-size: 23px; }
  .footer { align-items: start; flex-direction: column; padding-block: 32px; gap: 22px; }
}
@media (max-width: 440px) {
  .container { width: calc(100% - 36px); }
  .brand { font-size: 20px; gap: 8px; }
  .navigation { font-size: 11px; }
  .login { padding-inline: 14px; gap: 10px; }
  .hero-note { font-size: 10px; gap: 6px; }
  .actions .button { padding-inline: 18px; gap: 16px; font-size: 13px; }
  .flow-illustration { padding: 20px 16px 16px; }
  .flow-source, .flow-destination { width: 94%; padding-inline: 14px; }
  .flow-result { width: 100%; padding-inline: 12px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature + .feature { border-left: 0; border-top: 1px solid var(--line); }
  .feature p { min-height: 0; }
  .resource-list a { gap: 14px; }
  .resource-list div > span { font-size: 11px; }
  .closing { padding: 25px; }
  .closing h2 { font-size: 21px; }
  .footer > div { gap: 15px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
  .button:hover { transform: none; }
}