* { box-sizing: border-box; }

:root {
  --paper: #f2efe7;
  --ink: #20241f;
  --moss: #536b55;
  --muted: #777d74;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 80% 20%, rgba(83,107,85,.11), transparent 28rem),
    var(--paper);
  font-family: "SF Pro Text", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

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

.site-header {
  height: 64px;
  padding: 0 clamp(20px, 5vw, 76px);
  display: flex;
  align-items: center;
  gap: 13px;
  border-bottom: 1px solid rgba(32,36,31,.1);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  font: 500 16px "Songti SC", "STSong", Georgia, serif;
}

.brand b {
  font-size: 12px;
  letter-spacing: .12em;
}

.site-header > small {
  padding-left: 13px;
  border-left: 1px solid rgba(32,36,31,.14);
  color: var(--muted);
  font-size: 10px;
}

main { min-height: calc(100vh - 64px); }

.hero {
  min-height: calc(100vh - 64px);
  padding: clamp(70px, 11vh, 130px) clamp(22px, 9vw, 140px) 58px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.hero > p:first-child {
  margin: 0 0 27px;
  color: var(--moss);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .18em;
}

.hero h1 {
  margin: 0;
  font: 500 clamp(54px, 8vw, 116px)/1.02 "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  letter-spacing: -.065em;
}

.hero h1 em {
  color: var(--moss);
  font-style: normal;
}

.hero-copy {
  max-width: 540px;
  margin: 34px 0 0;
  color: var(--muted);
  font-size: clamp(14px, 1.3vw, 18px);
  line-height: 1.8;
}

.hero > a {
  min-width: 180px;
  min-height: 52px;
  margin-top: 30px;
  padding: 0 14px 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  background: var(--ink);
  color: #f7f4ec;
  font-size: 12px;
  font-weight: 800;
}

.hero > a span { font-size: 17px; font-weight: 400; }

.hero > small {
  margin-top: 22px;
  color: #8a8f86;
  font-size: 10px;
}

@media (max-width: 680px) {
  .site-header { height: 58px; padding: 0 16px; }
  .site-header > small { margin-left: auto; }
  main, .hero { min-height: calc(100vh - 58px); }
  .hero { padding: 64px 18px 42px; justify-content: flex-start; }
  .hero h1 { font-size: clamp(50px, 15vw, 73px); }
  .hero-copy { margin-top: 27px; }
}

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