:root {
  color-scheme: light;
  --paper: #fbfaf6;
  --surface: #ffffff;
  --surface-soft: #f1f5ef;
  --ink: #18201c;
  --muted: #667069;
  --green: #234d3b;
  --green-deep: #17382b;
  --green-pale: #dfeae2;
  --yellow: #f4c96b;
  --line: #dde4de;
  --shadow: 0 22px 70px rgba(35, 77, 59, 0.11);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
.shell { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }
.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid rgba(221, 228, 222, 0.85);
  background: rgba(251, 250, 246, 0.92);
  backdrop-filter: blur(16px);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 760; letter-spacing: .02em; }
.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 12px;
  background: var(--green);
  color: #fff;
  font-size: 16px;
  box-shadow: 0 8px 20px rgba(35, 77, 59, .18);
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--muted); font-size: 14px; text-decoration: none; }
.nav-links a:hover { color: var(--green); }

.hero { position: relative; overflow: hidden; padding: 92px 0 88px; }
.hero::before {
  position: absolute;
  width: 420px;
  height: 420px;
  right: -150px;
  top: -210px;
  border-radius: 50%;
  background: #edf2e9;
  content: "";
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 64px; }
.eyebrow { margin: 0 0 20px; color: var(--green); font-size: 14px; font-weight: 700; letter-spacing: .12em; }
h1 { max-width: 620px; margin: 0; font-size: clamp(38px, 5vw, 60px); line-height: 1.1; letter-spacing: -.045em; }
.hero-copy { max-width: 570px; margin: 24px 0 0; color: var(--muted); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: 36px; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--green);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(35, 77, 59, .19);
}
.button:hover { background: var(--green-deep); transform: translateY(-1px); }
.quiet { color: var(--muted); font-size: 13px; }

.demo-wrap { position: relative; padding: 22px; }
.demo-wrap::before {
  position: absolute;
  inset: 0;
  border-radius: 42px;
  background: var(--green-pale);
  content: "";
  transform: rotate(4deg);
}
.demo {
  position: relative;
  min-height: 430px;
  padding: 28px;
  overflow: hidden;
  border: 1px solid rgba(35, 77, 59, .1);
  border-radius: 34px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.demo-top { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 12px; }
.demo-title { margin: 45px 0 24px; font-size: 24px; line-height: 1.45; }
.bubble { width: fit-content; max-width: 86%; margin: 12px 0; padding: 13px 16px; border-radius: 18px 18px 18px 5px; background: var(--surface-soft); font-size: 14px; line-height: 1.65; }
.bubble.mine { margin-left: auto; border-radius: 18px 18px 5px; background: var(--green); color: #fff; }
.tip { display: flex; gap: 12px; margin-top: 26px; padding: 16px; border-radius: 16px; background: #fff8e8; color: #705518; font-size: 13px; line-height: 1.65; }
.tip-icon { flex: 0 0 auto; width: 22px; height: 22px; border-radius: 50%; background: var(--yellow); color: #4e3a0b; text-align: center; line-height: 22px; font-weight: 800; }

.section { padding: 92px 0; }
.section.soft { background: var(--surface-soft); }
.section-head { max-width: 610px; margin-bottom: 42px; }
.kicker { margin: 0 0 12px; color: var(--green); font-size: 13px; font-weight: 750; letter-spacing: .12em; }
h2 { margin: 0; font-size: clamp(30px, 4vw, 44px); line-height: 1.22; letter-spacing: -.035em; }
.section-intro { margin: 16px 0 0; color: var(--muted); line-height: 1.8; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { min-height: 238px; padding: 28px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); }
.number { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 13px; background: var(--surface-soft); color: var(--green); font-size: 13px; font-weight: 800; }
.card h3 { margin: 28px 0 10px; font-size: 20px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }

.boundary { display: grid; grid-template-columns: .85fr 1.15fr; gap: 72px; align-items: start; }
.facts { display: grid; gap: 14px; }
.fact { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.fact-mark { display: grid; width: 40px; height: 40px; place-items: center; border-radius: 13px; background: var(--green-pale); color: var(--green); font-weight: 800; }
.fact h3 { margin: 1px 0 5px; font-size: 16px; }
.fact p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }

.support { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 40px; border-radius: 28px; background: var(--green); color: #fff; }
.support h2 { font-size: clamp(26px, 3vw, 36px); }
.support p { max-width: 590px; margin: 12px 0 0; color: rgba(255,255,255,.72); line-height: 1.75; }
.support-label { flex: 0 0 auto; padding: 12px 18px; border: 1px solid rgba(255,255,255,.24); border-radius: 999px; font-size: 13px; }

.site-footer { padding: 30px 0 42px; color: var(--muted); font-size: 12px; }
.footer-row { display: flex; justify-content: space-between; gap: 24px; padding-top: 24px; border-top: 1px solid var(--line); }
.footer-row p { margin: 0; line-height: 1.8; }
.filing { text-align: right; }
.filing a { color: var(--muted); text-decoration: none; }
.filing a:hover { color: var(--green); text-decoration: underline; }

@media (max-width: 840px) {
  .hero { padding-top: 62px; }
  .hero-grid, .boundary { grid-template-columns: 1fr; gap: 58px; }
  .hero-copy { font-size: 16px; }
  .demo-wrap { width: min(100%, 480px); margin: 0 auto; }
  .cards { grid-template-columns: 1fr; }
  .card { min-height: 0; }
  .support { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 32px, 1120px); }
  .nav { min-height: 64px; }
  .nav-links a:not(:last-child) { display: none; }
  .hero { padding: 52px 0 66px; }
  h1 { font-size: 38px; }
  .demo-wrap { padding: 13px; }
  .demo { min-height: 405px; padding: 22px; border-radius: 26px; }
  .section { padding: 68px 0; }
  .support { padding: 28px; }
  .footer-row { flex-direction: column; }
  .filing { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}