:root {
  --ink: #182033;
  --ink-strong: #101827;
  --muted: #657086;
  --surface: #ffffff;
  --surface-soft: #f7f9fc;
  --line: rgba(27, 40, 68, 0.1);
  --navy: #12346f;
  --blue: #2f7df6;
  --teal: #16b8a6;
  --shadow: 0 18px 55px rgba(18, 52, 111, 0.1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  color: var(--ink);
  background: var(--surface-soft);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--navy); font-size: 24px; font-weight: 800; }
.logo-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  font-size: 18px;
  background: linear-gradient(135deg, var(--navy), var(--blue) 62%, var(--teal));
  box-shadow: 0 10px 24px rgba(47, 125, 246, 0.24);
}
.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; color: #344057; font-size: 15px; font-weight: 650; }
.nav-links a { padding: 8px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--navy); border-bottom-color: var(--blue); }

.page-hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 78% 24%, rgba(22, 184, 166, 0.28), transparent 30%),
    radial-gradient(circle at 16% 15%, rgba(47, 125, 246, 0.34), transparent 34%),
    linear-gradient(135deg, #07152d 0%, #102d63 48%, #15205a 100%);
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background-image:
    linear-gradient(rgba(255,255,255,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.16) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero-inner { position: relative; z-index: 1; padding: 78px 0 70px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  margin-bottom: 18px;
  padding: 6px 12px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  color: #d7f6ff;
  font-size: 14px;
}
.page-hero h1 { max-width: 840px; margin-bottom: 16px; font-size: clamp(36px, 5vw, 58px); line-height: 1.15; }
.page-hero .lead { max-width: 790px; color: #d9e6ff; font-size: clamp(16px, 2vw, 19px); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 26px; color: #c7d8f5; font-size: 14px; }

.language-bar {
  position: sticky;
  top: 72px;
  z-index: 15;
  background: rgba(247, 249, 252, .94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.language-inner { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.language-label { color: var(--muted); font-size: 14px; }
.language-switch { display: inline-flex; padding: 4px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.language-switch button {
  min-height: 36px;
  padding: 0 14px;
  border: 0;
  border-radius: 7px;
  color: #46536a;
  background: transparent;
  cursor: pointer;
  font-weight: 700;
}
.language-switch button[aria-selected="true"] { color: #fff; background: linear-gradient(135deg, var(--blue), var(--teal)); }

.main-section { padding: 64px 0 88px; }
.content-grid { display: grid; grid-template-columns: 250px minmax(0, 1fr); align-items: start; gap: 34px; }
.toc {
  position: sticky;
  top: 154px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 12px 34px rgba(18,52,111,.06);
}
.toc strong { display: block; margin-bottom: 12px; color: var(--ink-strong); }
.toc ol { padding-left: 20px; color: var(--muted); font-size: 14px; }
.toc li + li { margin-top: 7px; }
.toc a:hover { color: var(--blue); }
.article-card { padding: clamp(28px, 5vw, 54px); border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: var(--shadow); }
.article-card section { scroll-margin-top: 150px; }
.article-card section + section { margin-top: 42px; padding-top: 42px; border-top: 1px solid var(--line); }
.article-card h2 { margin-bottom: 14px; color: var(--ink-strong); font-size: clamp(23px, 3vw, 29px); line-height: 1.35; }
.article-card p + p, .article-card ul + p, .article-card p + ul { margin-top: 12px; }
.article-card ul { padding-left: 22px; }
.article-card li + li { margin-top: 7px; }
.article-card a { color: #1c65d5; text-decoration: underline; text-underline-offset: 3px; }
.notice {
  margin-bottom: 30px;
  padding: 18px 20px;
  border: 1px solid rgba(47,125,246,.18);
  border-left: 4px solid var(--blue);
  border-radius: 10px;
  background: #f3f8ff;
  color: #344057;
}

.support-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.support-card { padding: 26px; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 0 12px 34px rgba(18,52,111,.07); }
.support-card .number { display: block; margin-bottom: 9px; color: var(--blue); font-size: 14px; font-weight: 800; }
.support-card h2 { margin-bottom: 8px; color: var(--ink-strong); font-size: 21px; }
.support-card p { color: var(--muted); }
.contact-card {
  margin-bottom: 28px;
  padding: clamp(25px, 4vw, 38px);
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, #12346f, #244c94 62%, #167f84);
  box-shadow: 0 18px 44px rgba(18,52,111,.2);
}
.contact-card h2 { margin-bottom: 9px; font-size: 27px; }
.contact-card p { color: #d9e6ff; }
.contact-card a {
  display: inline-flex;
  margin-top: 18px;
  padding: 11px 18px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  font-weight: 750;
}
.disclaimer { margin-top: 28px; padding: 24px; border: 1px solid var(--line); border-radius: 14px; background: #fff; color: #526078; }
.disclaimer strong { display: block; margin-bottom: 8px; color: var(--ink-strong); }

.site-footer { color: #b7c5df; background: #071426; }
.footer-main { padding: 34px 0 22px; text-align: center; }
.footer-main strong { display: block; color: #fff; font-size: 17px; }
.footer-main p { margin-top: 6px; font-size: 14px; }
.footer-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 18px; margin-top: 15px; color: #d7e3f8; font-size: 14px; }
.footer-bottom { padding: 16px 0 22px; border-top: 1px solid rgba(255,255,255,.1); text-align: center; font-size: 13px; }

[data-language] { display: none; }
[data-language].is-active { display: block; }

@media (max-width: 820px) {
  .nav { min-height: 64px; }
  .nav-links { gap: 16px; font-size: 14px; }
  .language-bar { top: 64px; }
  .hero-inner { padding: 62px 0 58px; }
  .content-grid { grid-template-columns: 1fr; }
  .toc { display: none; }
  .support-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .container { width: min(100% - 28px, 1120px); }
  .logo { font-size: 20px; }
  .logo-mark { width: 34px; height: 34px; }
  .nav-links li:first-child { display: none; }
  .nav-links { gap: 12px; }
  .language-inner { min-height: 64px; }
  .language-label { display: none; }
  .language-switch { width: 100%; }
  .language-switch button { flex: 1; }
  .main-section { padding: 38px 0 62px; }
  .article-card { border-radius: 13px; }
  .page-hero h1 { font-size: 36px; }
}

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