body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f5fbff;
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 79, 154, 0.24), transparent 32%),
    linear-gradient(135deg, #5067e3 0%, #6b43cf 48%, #d246a9 100%);
}

main {
  width: min(820px, calc(100% - 36px));
  margin: 0 auto;
  padding: 42px 0 76px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 56px;
}

.brand {
  display: inline-flex;
  color: #fff;
  font-weight: 900;
  text-decoration: none;
}

.lang-switch {
  display: inline-flex;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(22, 26, 57, 0.52);
}

.lang-switch button {
  min-width: 44px;
  height: 30px;
  border: 0;
  border-radius: 999px;
  color: rgba(245, 251, 255, 0.7);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 900;
}

html[lang="zh-CN"] .lang-switch [data-lang="zh"],
html[lang="en"] .lang-switch [data-lang="en"] {
  color: #fff;
  background: linear-gradient(180deg, #ff4f9a, #7b4af0);
}

.lang-en {
  display: none;
}

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

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

h1 {
  margin: 0 0 22px;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1;
}

h2 {
  margin: 34px 0 10px;
  font-size: 24px;
}

p {
  color: #d5e6fb;
  font-size: 17px;
  line-height: 1.75;
}

a {
  color: #fff;
  font-weight: 800;
}

.email {
  font-size: 22px;
}