:root {
  color-scheme: light dark;
  --page: #f5f7f8;
  --surface: #ffffff;
  --ink: #152126;
  --muted: #5d6a70;
  --quiet: #849097;
  --line: #dce2e5;
  --accent: #327f8e;
  --accent-strong: #236673;
  --accent-soft: #e4f1f3;
  --focus: #0f6f82;
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100dvh;
  background: var(--page);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-strong); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 84%, transparent);
  background: color-mix(in srgb, var(--page) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav {
  width: min(1120px, calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 760;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--surface);
  font-size: 12px;
  letter-spacing: -0.03em;
}

.nav-actions { display: flex; align-items: center; gap: 18px; }
.nav-link { color: var(--muted); text-decoration: none; font-size: 13px; font-weight: 650; }
.nav-link[aria-current="page"] { color: var(--ink); }

.language-switch {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.language-switch button {
  min-width: 40px;
  min-height: 32px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  font-weight: 720;
  cursor: pointer;
}

.language-switch button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent-strong); }
.language-switch button:active { transform: translateY(1px); }

.shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: clamp(48px, 7vw, 96px);
  align-items: start;
}

.document { min-width: 0; padding: clamp(58px, 8vw, 108px) 0 96px; }
.hero { max-width: 760px; padding-bottom: clamp(44px, 6vw, 72px); border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 18px; color: var(--accent-strong); font-size: 12px; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
h1 { max-width: 720px; margin: 0; font-size: clamp(42px, 7vw, 74px); line-height: 0.98; letter-spacing: -0.055em; font-weight: 780; }
.lede { max-width: 650px; margin: 26px 0 0; color: var(--muted); font-size: clamp(17px, 2.2vw, 20px); line-height: 1.62; }
.effective { margin: 22px 0 0; color: var(--quiet); font-size: 13px; }

.notice {
  margin: 34px 0 0;
  padding: 18px 20px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 14px;
}

.legal-section { max-width: 760px; padding: 46px 0 4px; }
.legal-section + .legal-section { border-top: 1px solid var(--line); }
h2 { margin: 0 0 16px; color: var(--ink); font-size: clamp(24px, 3vw, 31px); line-height: 1.22; letter-spacing: -0.035em; }
h3 { margin: 26px 0 8px; font-size: 17px; line-height: 1.35; }
p { margin: 0 0 17px; color: var(--muted); }
ul { margin: 13px 0 22px; padding-left: 1.25em; color: var(--muted); }
li { margin: 8px 0; padding-left: 5px; }
strong { color: var(--ink); font-weight: 720; }

.toc { position: sticky; top: 100px; padding-top: 104px; }
.toc-title { margin: 0 0 13px; color: var(--quiet); font-size: 11px; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.toc a { display: block; padding: 6px 0; color: var(--muted); text-decoration: none; font-size: 13px; line-height: 1.4; }
.toc a:hover { color: var(--accent-strong); }

.site-footer { border-top: 1px solid var(--line); }
.footer-inner { width: min(1120px, calc(100% - 40px)); min-height: 100px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--quiet); font-size: 12px; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--muted); text-decoration: none; }

.hub { width: min(920px, calc(100% - 40px)); margin: 0 auto; padding: clamp(74px, 12vw, 140px) 0 96px; }
.hub h1 { max-width: 800px; }
.hub-list { margin-top: 64px; border-top: 1px solid var(--line); }
.hub-item { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; padding: 28px 0; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.hub-item h2 { margin: 0 0 4px; font-size: 21px; }
.hub-item p { margin: 0; font-size: 14px; }
.hub-arrow { color: var(--accent-strong); font-size: 22px; transition: transform 160ms ease; }
.hub-item:hover .hub-arrow { transform: translateX(4px); }

[hidden] { display: none !important; }

@media (max-width: 820px) {
  .nav { width: min(100% - 28px, 720px); }
  .nav-link { display: none; }
  .shell { width: min(100% - 36px, 720px); display: block; }
  .toc { display: none; }
  .document { padding-top: 58px; }
  .footer-inner { width: min(100% - 36px, 720px); padding: 25px 0; align-items: flex-start; flex-direction: column; justify-content: center; }
  .hub { width: min(100% - 36px, 720px); }
}

@media (max-width: 480px) {
  .brand-text { display: none; }
  .nav-actions { gap: 10px; }
  h1 { font-size: 42px; }
  .legal-section { padding-top: 36px; }
  .hub-item { grid-template-columns: 1fr 24px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0d1113;
    --surface: #171d20;
    --ink: #edf3f5;
    --muted: #aab6bb;
    --quiet: #7f8d93;
    --line: #293236;
    --accent: #63b6c6;
    --accent-strong: #8ad0dd;
    --accent-soft: #15292e;
    --focus: #8ad0dd;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header { background: var(--page); backdrop-filter: none; -webkit-backdrop-filter: none; }
}