:root {
  color-scheme: dark;
  --bg: #06080b;
  --panel: #0b1015;
  --ink: #edfaff;
  --muted: #95a6ad;
  --line: rgba(120, 238, 255, 0.18);
  --accent: #62f3ff;
  --accent-strong: #d6fcff;
  --fault: #ff547d;
  --max: 780px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  margin: 0;
  background:
    linear-gradient(rgba(98, 243, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(98, 243, 255, 0.018) 1px, transparent 1px),
    radial-gradient(circle at 85% -10%, rgba(98, 243, 255, 0.12), transparent 34rem),
    var(--bg);
  background-size: 4px 4px, 4px 4px, auto, auto;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent) 0 16%, transparent 16% 74%, var(--fault) 74% 78%, transparent 78%);
  content: "";
  pointer-events: none;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent-strong);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.shell {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 28px 0 88px;
}

.brandbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  margin-bottom: clamp(44px, 9vw, 82px);
}

.brandbar::before {
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 10px, transparent 10px 14px);
  content: "";
  order: 2;
}

.brand {
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-decoration: none;
  text-transform: uppercase;
}

.signal {
  color: var(--accent);
  font: 700 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.16em;
  order: 3;
}

.eyebrow {
  color: var(--accent);
  font: 700 12px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  position: relative;
  max-width: 18ch;
  margin: 12px 0 24px;
  font-size: clamp(34px, 8vw, 62px);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

h1::after {
  position: absolute;
  bottom: -10px;
  left: 0;
  width: min(38%, 180px);
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--fault) 0 18px, transparent 18px 24px, var(--accent) 24px 42px, transparent 42px 47px);
  content: "";
  opacity: 0.7;
  pointer-events: none;
}

.lede {
  max-width: 62ch;
  color: var(--muted);
  font-size: 17px;
}

.updated {
  margin: 22px 0 0;
  color: var(--muted);
  font: 600 12px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.document-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 30px 0;
  padding: 0;
  list-style: none;
}

.document-nav a,
.lang-switcher button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(11, 16, 21, 0.78);
  color: var(--muted);
  padding: 8px 15px;
  font: 700 12px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-decoration: none;
}

.document-nav a[aria-current="page"],
.lang-switcher button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--ink);
  box-shadow: inset 3px 0 var(--accent);
}

.lang-switcher {
  display: none;
  gap: 8px;
  margin: 30px 0 42px;
}

.js .lang-switcher {
  display: flex;
}

.lang-switcher button {
  cursor: pointer;
}

article {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

article h2 {
  margin: 42px 0 10px;
  color: var(--accent-strong);
  font-size: 19px;
  line-height: 1.35;
}

article h2::before {
  display: inline-block;
  width: 0.85em;
  height: 2px;
  margin-right: 0.65em;
  background: var(--accent);
  content: "";
  vertical-align: 0.28em;
}

article h3 {
  margin: 28px 0 8px;
  font-size: 16px;
}

article p,
article ul {
  color: #c7d4d9;
}

article ul {
  padding-left: 1.25rem;
}

article li + li {
  margin-top: 7px;
}

.notice {
  margin: 26px 0;
  border-block: 1px solid var(--line);
  background: rgba(98, 243, 255, 0.045);
  padding: 16px 18px;
  color: #dcebef;
}

.warning {
  border-color: color-mix(in srgb, var(--fault), transparent 42%);
}

details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

details:last-of-type {
  border-bottom: 1px solid var(--line);
}

summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 750;
}

details[open] summary {
  color: var(--accent-strong);
}

footer {
  margin-top: 64px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 12px;
}

@media (max-width: 480px) {
  .shell {
    width: min(100% - 24px, var(--max));
    padding-top: 20px;
  }

  .brandbar {
    grid-template-columns: 1fr auto;
    margin-bottom: 34px;
  }

  .brandbar::before {
    display: none;
  }

  .document-nav {
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html,
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

@media print {
  :root {
    color-scheme: light;
    --bg: #fff;
    --ink: #111;
    --muted: #555;
    --line: #ddd;
    --accent: #006a75;
    --accent-strong: #111;
  }

  body {
    background: #fff;
    color: #111;
    font-size: 11pt;
  }

  body::before,
  h1::after {
    display: none;
  }

  .shell {
    width: 100%;
    padding: 0;
  }

  .brandbar,
  .document-nav,
  .lang-switcher {
    display: none !important;
  }

  article {
    break-inside: auto;
  }

  article h2 {
    break-after: avoid;
  }

  article p,
  article ul {
    color: #222;
  }

  a {
    color: #111;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
  }
}