:root {
  --paper: #f6f5f2;
  --surface: #fbfaf7;
  --ink: #181a19;
  --muted: #626762;
  --line: #d6d7d2;
  --green: #355f55;
  --coral: #d86354;
  --max: 1210px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 250, 247, 0.96);
  border-bottom: 1px solid rgba(24, 26, 25, 0.08);
  backdrop-filter: blur(12px);
}

.header-inner,
.section-shell {
  width: min(var(--max), calc(100% - 56px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.wordmark {
  color: #323633;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #303431;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 15px;
}

.nav-links span {
  color: #a7aaa7;
}

.nav-links a,
.underlined-link,
.filing-links a {
  transition: color 180ms ease;
}

.nav-links a:hover,
.underlined-link:hover,
.filing-links a:hover {
  color: var(--green);
}

.hero {
  position: relative;
  display: flex;
  min-height: min(780px, calc(100vh - 78px));
  align-items: center;
  overflow: hidden;
  background-color: #d9d9d5;
  background-image: url("./assets/company-hero-selected.png");
  background-position: center;
  background-size: cover;
}

.hero-inner {
  width: min(var(--max), calc(100% - 56px));
  margin: 0 auto;
  padding: 86px 0 96px;
}

.hero h1 {
  max-width: 600px;
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(60px, 6vw, 88px);
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: 0;
}

.hero-services {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 30px 0 0;
  color: #383c39;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 20px;
  line-height: 1.7;
}

.hero-services span {
  white-space: nowrap;
}

.hero-services span + span::before {
  margin-right: 14px;
  color: var(--coral);
  content: "·";
}

.underlined-link {
  display: inline-block;
  margin-top: 70px;
  padding-bottom: 10px;
  color: #343936;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 16px;
  border-bottom: 2px solid var(--green);
}

.manifesto {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 76px;
  padding: 84px 0 96px;
}

.section-index span {
  color: var(--coral);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.section-index p {
  margin: 15px 0 0;
  color: var(--green);
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 16px;
}

.manifesto-copy {
  padding-left: 58px;
  border-left: 2px solid var(--green);
}

.manifesto-line {
  max-width: 890px;
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(28px, 3.2vw, 46px);
  line-height: 1.48;
}

.manifesto-line::after {
  display: block;
  width: 42px;
  height: 2px;
  margin-top: 28px;
  content: "";
  background: var(--coral);
}

.manifesto-detail {
  max-width: 760px;
  margin: 34px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.95;
}

.services {
  padding: 92px 0 112px;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 76px;
  align-items: end;
}

.section-heading h2 {
  max-width: 760px;
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(34px, 4vw, 54px);
  font-weight: 500;
  line-height: 1.35;
}

.service-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 72px;
  border-top: 1px solid #3e423f;
  border-bottom: 1px solid var(--line);
}

.service-columns article {
  min-height: 260px;
  padding: 32px 42px 36px;
}

.service-columns article + article {
  border-left: 1px solid var(--line);
}

.service-columns span {
  color: #9a9d99;
  font-size: 11px;
  font-weight: 700;
}

.service-columns h3 {
  margin: 54px 0 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 26px;
  font-weight: 500;
}

.service-columns p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 32px 0 44px;
  color: #777c78;
  font-size: 12px;
  border-top: 1px solid var(--line);
}

.site-footer > div {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
}

@media (max-width: 820px) {
  .header-inner,
  .section-shell,
  .hero-inner {
    width: min(100% - 30px, var(--max));
  }

  .header-inner {
    min-height: 62px;
  }

  .wordmark {
    font-size: 9px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    min-height: 600px;
    align-items: flex-end;
    background-position: 42% center;
  }

  .hero::before {
    position: absolute;
    inset: 0;
    content: "";
    background: rgba(246, 245, 242, 0.28);
  }

  .hero-inner {
    position: relative;
    z-index: 1;
    padding: 62px 0;
  }

  .hero h1 {
    max-width: 350px;
    font-size: 44px;
    line-height: 1.18;
  }

  .hero-services {
    max-width: 290px;
    margin-top: 24px;
    font-size: 16px;
  }

  .hero-services span + span::before {
    margin-right: 8px;
  }

  .underlined-link {
    margin-top: 42px;
  }

  .manifesto,
  .section-heading {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .manifesto {
    padding: 64px 0 76px;
  }

  .manifesto-copy {
    padding-left: 22px;
  }

  .manifesto-line {
    font-size: 28px;
  }

  .services {
    padding: 70px 0 84px;
  }

  .section-heading h2 {
    font-size: 34px;
  }

  .service-columns {
    grid-template-columns: 1fr;
    margin-top: 48px;
  }

  .service-columns article {
    min-height: 0;
    padding: 28px 0 32px;
  }

  .service-columns article + article {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .service-columns h3 {
    margin-top: 26px;
  }

  .site-footer {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}