body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  color: #1f2937;
  background: #f8fafc;
}

a {
  color: #2563eb;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

header {
  background: white;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav {
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.nav a {
  text-decoration: none;
}

.brand {
  font-size: 22px;
  font-weight: 700;
  color: #111827;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  overflow: hidden;
  background: #f8fafc;
}

.lang-button {
  border: 0;
  background: transparent;
  color: #475569;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
}

.lang-button.active {
  background: #2563eb;
  color: white;
}

.hero {
  background: linear-gradient(180deg, #ffffff 0%, #eef6ff 100%);
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  padding: 36px;
  margin-top: 28px;
}

h1,
h2,
h3 {
  color: #111827;
}

.card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 28px;
  margin-top: 24px;
}

ul {
  padding-left: 20px;
}

footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid #e5e7eb;
  color: #6b7280;
  font-size: 14px;
}

.footer-note {
  display: block;
  margin-top: 10px;
  color: #6b7280;
}

.filing-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: 10px;
}

.filing-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #6b7280;
  text-decoration: none;
}

.filing-links a:hover {
  color: #2563eb;
}

.filing-links img {
  display: block;
  width: 18px;
  height: 20px;
}

.lang-en {
  display: none;
}

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

html[data-lang="en"] .lang-en {
  display: revert;
}

@media (max-width: 700px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-right {
    width: 100%;
    align-items: flex-start;
  }

  .hero,
  .card {
    padding: 24px;
  }
}