:root {
  color-scheme: light;
  --ink: #161616;
  --soft: #5c5c5c;
  --line: #e8e8e8;
  --paper: #ffffff;
  --quiet: #f6f4ef;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: Manrope, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

p,
h1,
h2 {
  margin: 0;
}

p + p,
ul + p {
  margin-top: 18px;
}

ul {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

li {
  display: flex;
  gap: 12px;
  color: var(--soft);
}

li::before {
  content: "";
  width: 5px;
  height: 5px;
  margin-top: 14px;
  flex: 0 0 auto;
  background: var(--ink);
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid rgba(232, 232, 232, 0.8);
  background: rgba(255, 255, 255, 0.96);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px max(24px, calc((100vw - 1024px) / 2));
}

.brand {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.nav {
  display: flex;
  gap: 22px;
  color: var(--soft);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav a:hover,
.contact-link:hover {
  color: var(--ink);
}

.hero {
  width: min(1024px, 100%);
  margin: 0 auto;
  padding: 74px 24px 76px;
}

.eyebrow,
.section-number {
  color: var(--soft);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin-top: 28px;
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-size: 76px;
  font-weight: 400;
  line-height: 1;
}

.subtitle {
  max-width: 720px;
  margin-top: 22px;
  color: var(--soft);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 30px;
  line-height: 1.32;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 44px;
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.hero-grid p {
  color: var(--soft);
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 20px;
  line-height: 1.95;
}

.section {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 56px;
  width: min(1024px, 100%);
  margin: 0 auto;
  padding: 72px 24px;
  border-top: 1px solid var(--line);
}

.copy-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 54px;
}

article + article {
  padding-left: 44px;
  border-left: 1px solid var(--line);
}

h2 {
  margin-bottom: 24px;
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-size: 34px;
  font-weight: 400;
  line-height: 1.18;
}

article p,
article li {
  color: var(--soft);
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-size: 18px;
  line-height: 1.85;
}

article[lang="zh-CN"] p,
article[lang="zh-CN"] li {
  font-family: "Noto Serif SC", Georgia, serif;
}

.contact-section {
  background: linear-gradient(180deg, var(--paper), var(--quiet));
}

.contact-link {
  display: inline-block;
  margin-top: 26px;
  border-bottom: 1px solid var(--line);
  color: var(--soft);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  width: min(1024px, 100%);
  margin: 0 auto;
  padding: 38px 24px 56px;
  border-top: 1px solid var(--line);
  color: var(--soft);
  font-size: 14px;
}

@media (max-width: 820px) {
  .site-header {
    padding: 16px 20px;
  }

  .nav {
    display: none;
  }

  .hero {
    padding: 56px 20px 62px;
  }

  h1 {
    font-size: 52px;
  }

  .subtitle {
    font-size: 24px;
  }

  .hero-grid,
  .section,
  .copy-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid,
  .copy-grid,
  .section {
    gap: 28px;
  }

  .section {
    padding: 58px 20px;
  }

  article + article {
    padding-left: 0;
    padding-top: 30px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .footer {
    flex-direction: column;
    padding: 30px 20px 44px;
  }
}