:root {
  --paper: #f8f5ed;
  --paper-raised: #fffdf7;
  --ink: #18212b;
  --muted: #65707b;
  --line: rgba(24, 33, 43, 0.13);
  --accent: #174a72;
  --accent-soft: #e1edf4;
  --shadow: 0 24px 70px rgba(32, 43, 54, 0.10);
  color-scheme: light;
}

* { box-sizing: border-box; }

html {
  background: var(--paper);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 8%, rgba(173, 207, 226, 0.28), transparent 28rem),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.68;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
button, a { -webkit-tap-highlight-color: transparent; }

.page-shell {
  width: min(1120px, calc(100% - 40px));
  min-height: 100vh;
  margin: 0 auto;
}

.site-header {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 19px;
  font-weight: 680;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(145deg, #286a98, #123d61);
  box-shadow: 0 8px 24px rgba(23, 74, 114, 0.22);
  font-family: Georgia, serif;
}

.nav-copy { display: flex; gap: 26px; }
.nav-copy a { color: var(--muted); font-size: 15px; font-weight: 590; text-decoration: none; }
.nav-copy a[aria-current="page"] { color: var(--ink); }

.hero {
  min-height: 660px;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(300px, 0.7fr);
  align-items: center;
  gap: clamp(48px, 8vw, 112px);
  padding: 92px 0;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-family: ui-serif, "New York", Georgia, serif;
  font-size: clamp(45px, 7vw, 78px);
  font-weight: 560;
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.lede {
  max-width: 650px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.58;
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
}
.button.primary { color: #fff; background: var(--accent); border-color: var(--accent); }
.button.secondary { color: var(--ink); background: rgba(255, 255, 255, 0.45); }

.info-card {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: flex-end;
  padding: 34px;
  overflow: hidden;
  border: 1px solid rgba(24, 33, 43, 0.09);
  border-radius: 28px;
  background: var(--paper-raised);
  box-shadow: var(--shadow);
  transform: rotate(1.2deg);
}

.paper-lines { position: absolute; inset: 45px 34px auto; }
.paper-lines span { display: block; width: 100%; height: 1px; margin-bottom: 34px; background: var(--line); }
.paper-lines span:nth-child(2) { width: 88%; }
.paper-lines span:nth-child(3) { width: 94%; }
.paper-lines span:nth-child(4) { width: 63%; }

.info-card dl { position: relative; width: 100%; margin: 0; }
.info-card dl > div { padding: 13px 0; border-top: 1px solid var(--line); }
.info-card dt { color: var(--muted); font-size: 12px; font-weight: 680; letter-spacing: 0.06em; text-transform: uppercase; }
.info-card dd { margin: 3px 0 0; font-size: 15px; overflow-wrap: anywhere; }

.language-section { padding: 8px 0 90px; }
.language-picker { display: flex; flex-wrap: wrap; gap: 8px; }
.language-picker button {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.38);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.language-picker button[aria-pressed="true"] { color: #fff; background: var(--accent); border-color: var(--accent); }

.document-main { width: min(790px, 100%); margin: 0 auto; padding: 56px 0 110px; }
.document-tools { display: flex; justify-content: flex-end; margin-bottom: 62px; }
.document h1 { font-size: clamp(39px, 6vw, 62px); }
.document-intro { margin: 26px 0 0; color: var(--muted); font-size: 20px; line-height: 1.55; }
.document-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 34px 0 52px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.prose p { margin: 0 0 1.45em; }
.prose p:first-child { color: var(--muted); font-weight: 620; }
.prose h2 {
  margin: 2.2em 0 0.7em;
  font-size: clamp(22px, 3.2vw, 28px);
  line-height: 1.28;
  letter-spacing: -0.025em;
}
.prose ul {
  margin: 0 0 1.65em;
  padding: 18px 22px 18px 42px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--accent-soft) 46%, transparent);
}
.prose li { margin: 0.48em 0; padding-left: 0.25em; }

footer {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 30px;
  padding: 32px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
footer p { margin: 0; }
footer .localized { text-align: right; }

.localized { display: none !important; }
html[data-lang="zh-Hans"] [data-copy-lang="zh-Hans"],
html[data-lang="en"] [data-copy-lang="en"],
html[data-lang="ja"] [data-copy-lang="ja"],
html[data-lang="ko"] [data-copy-lang="ko"] { display: block !important; }
html[data-lang="zh-Hans"] .nav-copy[data-copy-lang="zh-Hans"],
html[data-lang="en"] .nav-copy[data-copy-lang="en"],
html[data-lang="ja"] .nav-copy[data-copy-lang="ja"],
html[data-lang="ko"] .nav-copy[data-copy-lang="ko"] { display: flex !important; }

@media (max-width: 760px) {
  .page-shell { width: min(100% - 28px, 680px); }
  .site-header { min-height: 72px; align-items: center; }
  .nav-copy { gap: 15px; }
  .nav-copy a { font-size: 13px; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 58px; padding: 68px 0 74px; }
  .info-card { min-height: 350px; padding: 26px; border-radius: 24px; transform: none; }
  .document-main { padding: 38px 0 80px; }
  .document-tools { justify-content: flex-start; margin-bottom: 48px; }
  .document-meta { display: grid; }
  footer { grid-template-columns: 1fr; gap: 10px; }
  footer .localized { text-align: left; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .brand span:last-child { display: none; }
  h1 { font-size: 43px; }
  .actions { display: grid; }
  .button { width: 100%; }
  .language-picker { gap: 6px; }
  .language-picker button { padding: 0 11px; font-size: 13px; }
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #11161b;
    --paper-raised: #182028;
    --ink: #edf2f5;
    --muted: #a4afb8;
    --line: rgba(237, 242, 245, 0.14);
    --accent: #8bc4e8;
    --accent-soft: #22384a;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
    color-scheme: dark;
  }
  .button.primary { color: #10202d; }
  .button.secondary, .language-picker button { background: rgba(255, 255, 255, 0.04); }
}