:root {
  color-scheme: light;
  --ink: #111111;
  --muted: #666666;
  --line: rgba(17, 17, 17, 0.1);
  --paper: #ffffff;
  --wash: #f7f7f5;
  --accent: #e64a2e;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a { color: inherit; }

a:focus-visible {
  outline: 3px solid rgba(230, 74, 46, 0.35);
  outline-offset: 4px;
  border-radius: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.header-inner,
.page-shell,
.footer-inner {
  width: min(100% - 40px, 960px);
  margin-inline: auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 22px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--ink); }

.page-shell { padding: 88px 0 96px; }

.eyebrow {
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  max-width: 780px;
  margin: 12px 0 18px;
  font-size: clamp(2.3rem, 6vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 760px;
  margin: 0;
  color: #4c4c4c;
  font-size: clamp(1.05rem, 2.3vw, 1.28rem);
}

.updated {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.content {
  margin-top: 58px;
  border-top: 1px solid var(--line);
}

.section {
  display: grid;
  grid-template-columns: minmax(180px, 0.34fr) minmax(0, 0.66fr);
  gap: 36px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.45;
  letter-spacing: -0.015em;
}

.section-body > :first-child { margin-top: 0; }
.section-body > :last-child { margin-bottom: 0; }

.section p,
.section li { color: #3f3f3f; }

.section ul { margin: 0; padding-left: 1.2rem; }
.section li + li { margin-top: 0.35rem; }

.zh {
  display: block;
  margin-top: 0.28rem;
  color: var(--muted);
  font-size: 0.88em;
  font-weight: 500;
  letter-spacing: 0;
}

.lang-block + .lang-block {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--line);
}

.contact-card {
  display: grid;
  gap: 10px;
  padding: 22px;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 18px;
}

.contact-card a {
  width: fit-content;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 8px;
  padding: 0 20px;
  color: white;
  background: var(--ink);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  padding: 34px 0;
  background: var(--wash);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
}

.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

@media (max-width: 700px) {
  .header-inner { align-items: flex-start; padding: 15px 0; }
  .site-nav { gap: 5px 13px; }
  .site-nav a { font-size: 0.8rem; }
  .page-shell { padding: 64px 0 72px; }
  .section { grid-template-columns: 1fr; gap: 12px; }
  .footer-inner { flex-direction: column; }
  .footer-links { justify-content: flex-start; }
}

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