:root {
  color-scheme: light;
  --paper: #faf8f5;
  --ink: #1b2222;
  --muted: #5e6a69;
  --line: #dedfd8;
  --teal: #087f83;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
a {
  color: var(--teal);
  text-underline-offset: 4px;
}
a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 5px;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
.site {
  max-width: 1200px;
  margin: auto;
  padding: 0 40px;
}
.site-header {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 100px;
  border-bottom: 1px solid var(--line);
}
.wordmark {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  font-family: Georgia, "Songti SC", serif;
  font-size: 28px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.wordmark img {
  object-fit: contain;
  flex: none;
}
.site-header nav {
  display: flex;
  gap: 24px;
  margin-inline-start: auto;
}
.site-header nav a,
.language {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding: 14px 0;
}
.site-header a[aria-current="page"] {
  color: var(--teal);
}
.language {
  border-inline-start: 1px solid var(--line);
  padding-inline-start: 24px;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  align-items: center;
  gap: 50px;
  padding: 98px 0 76px;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--teal);
  font-weight: 600;
  line-height: 1.8;
  margin: 0 0 22px;
}
h1 {
  text-wrap: balance;
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(36px, 4.5vw, 61px);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin: 0 0 28px;
  max-width: 810px;
}
html[lang="zh-CN"] h1 {
  line-height: 1.35;
  letter-spacing: 0;
  font-size: clamp(34px, 4.1vw, 53px);
}
.lead {
  font-size: 18px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 690px;
  margin: 0;
}
.hero-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 290px;
  height: 290px;
  border: 1px solid var(--line);
  border-radius: 28px;
  overflow: hidden;
  background: #faf9f6;
}
.hero-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 26px;
  margin-top: 34px;
}
.primary {
  background: var(--teal);
  color: white;
  border-radius: 7px;
  padding: 15px 22px;
  text-decoration: none;
  font-size: 15px;
  display: flex;
  gap: 24px;
  align-items: center;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-block-start: 1px solid var(--line);
  padding: 38px 0;
  gap: 36px;
}
.features article + article {
  border-inline-start: 1px solid var(--line);
  padding-inline-start: 36px;
}
.number {
  color: var(--teal);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
h2 {
  font-size: 22px;
  line-height: 1.5;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 14px 0;
}
.features p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
  margin: 0;
}

footer {
  border-top: 1px solid var(--line);
  padding: 30px 0 38px;
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
}
footer .wordmark {
  font-size: 22px;
}
footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-inline-start: auto;
}
footer nav a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
}
footer > p {
  width: 100%;
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}
.document-header {
  padding: 66px 0 48px;
  border-bottom: 1px solid var(--line);
}
.document-header h1 {
  font-size: 50px;
}
.effective {
  font-size: 13px;
  color: var(--muted);
  margin: 24px 0 0;
}
.document-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 70px;
  padding: 46px 0 75px;
}
.document-layout aside nav {
  position: sticky;
  top: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.document-layout aside a {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  text-decoration: none;
}
.document-layout aside .eyebrow {
  margin-bottom: 5px;
}
.document-layout aside a:hover {
  color: var(--teal);
}
.document-layout aside .back {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 12px;
  color: var(--teal);
}
.document-body {
  max-width: 730px;
}
.document-body p {
  font-size: 15px;
  line-height: 1.95;
  margin: 0 0 18px;
  overflow-wrap: anywhere;
}
.document-body .intro {
  font-size: 17px;
  color: var(--muted);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.document-body section {
  scroll-margin-top: 28px;
  padding-top: 16px;
}
.document-body h2 {
  font-size: 23px;
  margin: 16px 0 20px;
}
.skip {
  position: absolute;
  inset-inline-start: 20px;
  top: -100px;
  background: white;
  padding: 12px;
  z-index: 5;
}
.skip:focus {
  top: 8px;
}
@media (max-width: 800px) {
  .site {
    padding: 0 24px;
  }
  .site-header {
    gap: 18px;
    min-height: 85px;
    flex-wrap: wrap;
    padding: 18px 0;
  }
  .site-header nav {
    order: 3;
    width: 100%;
    margin: 0;
    gap: 22px;
  }
  .site-header nav a {
    padding: 0;
  }
  .language {
    margin-inline-start: auto;
  }
  .hero {
    grid-template-columns: 1fr;
    gap: 35px;
    padding: 55px 0 40px;
  }
  .hero-mark {
    display: none;
  }
  .features {
    gap: 20px;
  }
  .features article + article {
    padding-inline-start: 20px;
  }

  .document-layout {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 28px;
  }
  .document-layout aside nav {
    position: static;
    gap: 10px;
  }
  .document-layout aside {
    border-bottom: 1px solid var(--line);
    padding-bottom: 24px;
  }
  .document-layout aside .back {
    display: none;
  }
  .document-header {
    padding: 45px 0 30px;
  }
  .document-header h1 {
    font-size: 40px;
  }
  footer nav {
    margin: 0;
  }
}
@media (max-width: 520px) {
  .features {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .features article + article {
    border-inline-start: 0;
    border-top: 1px solid var(--line);
    padding: 25px 0 0;
  }
  .lead {
    font-size: 16px;
  }
  .site-header nav {
    gap: 18px;
  }
  .site-header nav a {
    font-size: 13px;
  }
  .document-body p {
    font-size: 15px;
  }
  footer {
    gap: 20px;
  }
  footer nav {
    gap: 18px;
  }

  .hero-actions {
    gap: 20px;
  }
  .wordmark {
    font-size: 26px;
  }
}
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}
@media print {
  .site-header nav,
  .language,
  .document-layout aside,
  .hero-actions,
  .skip {
    display: none;
  }
  .site {
    max-width: none;
    padding: 0;
  }
  .document-layout {
    display: block;
  }
  .document-body {
    max-width: none;
  }
  body {
    background: white;
  }
  a {
    color: inherit;
  }
  footer {
    break-inside: avoid;
  }
}