:root {
  --paper: #f3efe6;
  --ink: #1b1916;
  --quiet: #6a635a;
  --rule: #d8d0c4;
  --card: #faf8f3;
  --accent: #6e2d16;
  --max: 920px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

html {
  background: var(--paper);
  color: var(--ink);
}

body {
  min-height: 100vh;
  font: 17px/1.65 "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    "Source Han Sans SC", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0.01em;
}

html[data-lang="zh"] [data-lang="en"],
html[data-lang="en"] [data-lang="zh"] {
  display: none !important;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { color: var(--ink); }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

.site-header {
  border-bottom: 1px solid var(--rule);
  padding: 22px 0 18px;
}

.site-header .wrap {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: inherit;
  text-decoration: none;
  min-width: 0;
}

.brand:hover { color: inherit; }

.brand-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.brand-meta {
  display: block;
  margin-top: 4px;
  color: var(--quiet);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px 18px;
  font-size: 14px;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
}

.nav a:hover,
.nav a.is-current {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.lang {
  display: flex;
  gap: 8px;
  margin-left: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--rule);
}

.lang button {
  appearance: none;
  background: none;
  border: 0;
  padding: 0;
  color: var(--quiet);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.lang button:hover { color: var(--ink); }

html[data-lang="zh"] .lang [data-set-lang="zh"],
html[data-lang="en"] .lang [data-set-lang="en"] {
  color: var(--ink);
  font-weight: 600;
}

main { padding: 56px 0 80px; }

.kicker {
  margin: 0 0 14px;
  color: var(--quiet);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4.4vw, 42px);
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.lede {
  margin: 0 0 28px;
  max-width: 38em;
  color: var(--quiet);
  font-size: 18px;
}

.rule {
  width: 48px;
  height: 1px;
  margin: 0 0 28px;
  background: var(--ink);
  border: 0;
}

.prose p { margin: 0 0 16px; max-width: 40em; }
.prose p:last-child { margin-bottom: 0; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.btn {
  display: inline-block;
  padding: 11px 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.btn:hover { color: var(--paper); opacity: 0.88; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

.btn-ghost:hover { color: var(--ink); opacity: 1; background: #e8e2d6; }

.facts {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.facts li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.facts dt,
.facts .label {
  color: var(--quiet);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.facts dd,
.facts .value {
  margin: 0;
}

.contact-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.contact-list li {
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.contact-list .label {
  display: block;
  margin-bottom: 6px;
  color: var(--quiet);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.contact-list .value {
  font-size: 20px;
  line-height: 1.45;
}

.contact-list a { color: inherit; text-decoration: none; }
.contact-list a:hover { color: var(--accent); text-decoration: underline; }

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 22px 0 40px;
  color: var(--quiet);
  font-size: 13px;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
}

.site-footer a { color: var(--quiet); }

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  .site-header .wrap { flex-direction: column; }
  .nav { justify-content: flex-start; }
  .lang { margin-left: 0; padding-left: 0; border-left: 0; }
  main { padding: 36px 0 64px; }
  .facts li { grid-template-columns: 1fr; gap: 4px; }
  .contact-list .value { font-size: 18px; }
}