:root {
  color-scheme: light;
  --ink: #111521;
  --muted: #69707c;
  --line: rgba(22, 31, 47, .1);
  --blue: #2e7df6;
  --paper: #f6f7f9;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(111, 165, 255, .12), transparent 28%),
    linear-gradient(180deg, #fbfcfd, var(--paper));
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }

.document-header {
  position: sticky;
  z-index: 5;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 82px;
  padding: 0 clamp(28px, 5vw, 72px);
  border-bottom: 1px solid rgba(22, 31, 47, .06);
  background: rgba(250, 251, 253, .82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.document-brand { display: block; width: 122px; line-height: 0; }
.document-brand img { display: block; width: 100%; height: auto; }

.home-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #505865;
  font-size: 12px;
}

.document-actions { display: flex; align-items: center; gap: 25px; }

.document-language {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.document-language span { color: #8a9099; font-size: 8px; font-weight: 800; letter-spacing: .16em; }
.document-language select {
  min-width: 51px;
  padding: 7px 18px 7px 9px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background:
    linear-gradient(45deg, transparent 50%, #6f7681 50%) calc(100% - 10px) calc(50% - 2px) / 4px 4px no-repeat,
    linear-gradient(135deg, #6f7681 50%, transparent 50%) calc(100% - 6px) calc(50% - 2px) / 4px 4px no-repeat,
    rgba(255,255,255,.68);
  font-size: 10px;
  font-weight: 700;
  appearance: none;
  cursor: pointer;
}

.document-main {
  width: min(820px, calc(100% - 48px));
  margin: 0 auto;
  padding: 96px 0 120px;
}

.document-eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.document-main h1 {
  margin: 0;
  font-size: clamp(46px, 7vw, 76px);
  line-height: 1;
  letter-spacing: -.06em;
}

.document-summary {
  max-width: 680px;
  margin: 30px 0 0;
  color: #535b68;
  font-size: 15px;
  line-height: 2;
}

.updated {
  margin: 24px 0 0;
  color: #8a9099;
  font-size: 10px;
  letter-spacing: .06em;
}

.document-content {
  margin-top: 72px;
  border-top: 1px solid var(--line);
}

.document-section {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 42px;
  padding: 42px 0;
  border-bottom: 1px solid var(--line);
}

.document-section h2 {
  margin: 0;
  font-size: 15px;
  letter-spacing: -.02em;
}

.document-copy { color: #5e6672; font-size: 13px; line-height: 1.95; }
.document-copy p { margin: 0; }
.document-copy p + p { margin-top: 14px; }
.document-copy ul { margin: 0; padding-left: 1.25em; }
.document-copy li + li { margin-top: 6px; }
.document-copy a { color: #245fae; text-decoration: underline; text-underline-offset: 3px; }

.document-footer {
  display: flex;
  justify-content: space-between;
  width: min(820px, calc(100% - 48px));
  margin: 0 auto;
  padding: 30px 0 46px;
  border-top: 1px solid var(--line);
  color: #858b95;
  font-size: 10px;
}

.document-footer nav { display: flex; gap: 18px; }
.document-footer a:hover { color: var(--ink); }

.error-page {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 40px;
  text-align: center;
}

.error-card img { width: min(330px, 70vw); }
.error-code { margin: 52px 0 0; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .2em; }
.error-card h1 { margin: 13px 0 0; font-size: clamp(34px, 6vw, 58px); letter-spacing: -.05em; }
.error-card p { margin: 16px 0 0; color: var(--muted); font-size: 13px; }
.error-home { display: inline-flex; margin-top: 30px; padding: 12px 18px; border-radius: 999px; color: #fff; background: var(--ink); font-size: 11px; }

@media (max-width: 680px) {
  .document-main { padding-top: 68px; }
  .document-section { grid-template-columns: 1fr; gap: 16px; }
  .document-footer { flex-direction: column; gap: 15px; }
}

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