:root {
  --cream: #f5f2e9;
  --ink: #153d37;
  --ink-soft: #536b61;
  --sage: #daeadf;
  --lilac: #e7e2f1;
  --line: #c9c4b8;
  --serif: Georgia, "Iowan Old Style", "Songti SC", serif;
  --sans: system-ui, -apple-system, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--cream); color: var(--ink); font-family: var(--sans); line-height: 1.6; }
a { color: inherit; }
.wrap { max-width: 1256px; margin: 0 auto; padding: 0 32px; }
header.top, footer.foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 24px 0; }
header.top { min-height: 112px; }
header.top { border-bottom: 1px solid var(--line); }
footer.foot { border-top: 1px solid var(--line); font-size: 14px; color: var(--ink-soft); }
.brand { font-family: var(--serif); font-weight: 700; font-size: 20px; text-decoration: none; }
.brand.small { font-size: 16px; }
.links a { text-decoration: none; }
nav a { margin-left: 20px; text-decoration: none; font-size: 15px; color: var(--ink-soft); }
nav a:hover { color: var(--ink); }
.lang button { background: none; border: 0; font: inherit; color: var(--ink-soft); cursor: pointer; padding: 0 4px; }
.lang button[aria-pressed="true"] { color: var(--ink); font-weight: 700; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--ink); text-transform: uppercase; margin: 0 0 16px; }
h1, h2 { font-family: var(--serif); font-weight: 500; line-height: 1.12; margin: 0; }
html[lang='zh-Hans'] h1, html[lang='zh-Hans'] h2 { font-family: var(--sans); font-weight: 600; }
h1 { font-size: clamp(48px, 6.3vw, 88px); }
h2 { font-size: clamp(36px, 4.4vw, 58px); }
.lede { font-size: 20px; color: var(--ink-soft); margin: 28px 0 0; }
.hero { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; padding: 72px 0 96px; border-bottom: 1px solid var(--line); }
.status { display: inline-block; margin-top: 40px; border: 1.5px solid var(--ink); color: var(--ink); padding: 12px 26px; border-radius: 999px; font-weight: 600; }
.boundary { font-size: 15px; margin-top: 20px; }
.fine { font-size: 14px; color: var(--ink-soft); margin-top: 14px; }
.hero img { width: 100%; height: auto; display: block; }
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 96px 0; border-bottom: 1px solid var(--line); }
.feature .panel { background: var(--lilac); border-radius: 28px; padding: 40px; }
.feature .panel img { border: 10px solid #fff; border-radius: 14px; box-shadow: 0 18px 40px rgba(21,61,55,.15); }
.feature .panel img { width: 100%; height: auto; display: block; }
.steps { list-style: none; padding: 0; margin: 40px 0 0; border-top: 1px solid var(--line); }
.steps li { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 18px; font-weight: 600; min-height: 44px; }
.steps span { color: var(--ink-soft); font-weight: 400; margin-right: 12px; }
.private { background: var(--ink); color: var(--cream); border-radius: 32px; padding: 72px 64px; margin: 96px 0; display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; }
.private h2 { color: var(--cream); }
.private p { color: #d6e4dc; font-size: 18px; margin: 28px 0 0; }
.private .badge { width: 170px; height: 170px; border-radius: 50%; border: 2px solid var(--sage); display: grid; place-items: center; text-align: center; font-family: var(--serif); font-size: 26px; color: var(--sage); }
.light { padding: 48px 0 96px; }
.light .kinds { margin-top: 32px; font-size: 22px; color: var(--ink-soft); }
.light .kinds span { margin-right: 14px; }
.doc { max-width: 720px; margin: 0 auto; padding: 72px 32px 96px; }
.doc h1 { font-size: 48px; margin-bottom: 12px; }
.doc h2 { font-size: 26px; margin: 44px 0 12px; }
.doc p, .doc li { font-size: 17px; color: #2a4641; }
.doc ul { padding-left: 22px; }
.doc .meta { color: var(--ink-soft); font-size: 15px; }
/* Hide the language that is not selected. Author display rules stay intact for the visible copy. */
html[data-lang="en"] [data-lang="zh"], html[data-lang="zh"] [data-lang="en"] { display: none !important; }
@media (max-width: 760px) {
  .wrap { padding: 0 20px; }
  .hero, .feature { grid-template-columns: 1fr; gap: 32px; padding: 48px 0 64px; }
  .private { grid-template-columns: 1fr; padding: 44px 28px; margin: 64px 0; }
  .private .badge { width: 130px; height: 130px; font-size: 20px; }
  nav a { margin-left: 12px; }
  h1 { font-size: 40px; }
  h2 { font-size: 34px; }
  .lede { font-size: 17px; }
  header.top { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
.foot .links { white-space: nowrap; }