:root {
  --site-max-width: 1320px;
  --site-gutter: 32px;
  --site-header-height: 72px;
  --content: min(var(--site-max-width), calc(100% - (2 * var(--site-gutter))));
  --shell-text: #eef2fb;
  --shell-muted: #93a0bb;
  --shell-line: rgba(126, 148, 210, .16);
  --shell-cyan: #3ee5ff;
  --shell-violet: #a06bff;
  --shell-font: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
}

html {
  background: #04060c;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(900px 540px at 84% -12%, rgba(62, 229, 255, .1), transparent 64%),
    radial-gradient(800px 620px at 0 32%, rgba(160, 107, 255, .08), transparent 64%),
    #04060c;
  font-family: var(--shell-font);
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  opacity: .46;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(126, 148, 210, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 148, 210, .045) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 84%);
  content: "";
}

.site-frame,
.page-shell {
  width: var(--content);
  margin-inline: auto;
}

.site-nav {
  position: sticky;
  z-index: 60;
  top: 0;
  width: 100%;
  height: var(--site-header-height);
  min-height: var(--site-header-height);
  border-bottom: 1px solid var(--shell-line);
  color: var(--shell-text);
  background: rgba(4, 6, 12, .8);
  backdrop-filter: blur(18px);
}

.nav-wrap {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 28px;
  height: 100%;
}

.header-actions {
  display: flex;
  align-items: stretch;
  gap: 20px;
  min-width: 0;
  margin-left: auto;
}

.locale-switcher {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
}

.locale-switcher summary {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 48px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid rgba(126, 148, 210, .25);
  border-radius: 5px;
  color: var(--shell-muted);
  background: rgba(10, 15, 25, .72);
  font: 600 .66rem/1 var(--shell-font);
  list-style: none;
  cursor: pointer;
}

.locale-switcher summary::-webkit-details-marker {
  display: none;
}

.locale-switcher summary:hover,
.locale-switcher[open] summary {
  border-color: rgba(62, 229, 255, .52);
  color: var(--shell-text);
}

.locale-switcher summary img,
.locale-menu img {
  display: block;
  width: 18px;
  height: 12px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 2px;
  object-fit: cover;
}

.locale-switcher summary i {
  color: #6f7e99;
  font-size: .7rem;
  font-style: normal;
  transform: translateY(-1px);
}

.locale-menu {
  position: absolute;
  z-index: 80;
  top: calc(100% - 10px);
  right: 0;
  display: grid;
  gap: 3px;
  width: 164px;
  padding: 6px;
  border: 1px solid rgba(126, 148, 210, .28);
  border-radius: 7px;
  background: rgba(8, 12, 21, .98);
  box-shadow: 0 18px 44px rgba(0, 0, 0, .48), 0 0 24px rgba(62, 229, 255, .06);
}

.locale-menu a {
  display: grid;
  grid-template-columns: 18px 1fr auto;
  align-items: center;
  gap: 9px;
  min-height: 34px;
  padding: 0 8px;
  border-radius: 4px;
  color: var(--shell-muted);
  font: 500 .7rem/1.2 var(--shell-font);
}

.locale-menu a:hover,
.locale-menu a[data-current="true"] {
  color: var(--shell-text);
  background: rgba(62, 229, 255, .08);
}

.locale-menu b {
  color: #6f7e99;
  font: 500 .58rem/1 var(--shell-font);
}

html:lang(zh-CN) {
  --shell-font: "Noto Sans SC", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
}

html:lang(ja) {
  --shell-font: "Noto Sans JP", "Yu Gothic UI", "Meiryo", ui-sans-serif, system-ui, sans-serif;
}

html:lang(zh-CN) .benchmark-page,
html:lang(zh-CN) .evidence-page-body,
html:lang(ja) .benchmark-page,
html:lang(ja) .evidence-page-body {
  --sans: var(--shell-font);
}

html:lang(zh-CN) .primary-nav a,
html:lang(ja) .primary-nav a,
html:lang(zh-CN) .brand,
html:lang(ja) .brand {
  letter-spacing: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--shell-text);
  font: 700 1.18rem/1 var(--shell-font);
  letter-spacing: -.035em;
  white-space: nowrap;
}

.brand-mark {
  display: block;
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.primary-nav {
  display: flex;
  align-items: stretch;
  align-self: stretch;
  gap: 34px;
  height: 100%;
}

.primary-nav a {
  display: grid;
  position: relative;
  place-items: center;
  align-self: stretch;
  min-width: max-content;
  color: var(--shell-muted);
  font: 500 .78rem/1 var(--shell-font);
  transition: color .18s ease;
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--shell-text);
}

.primary-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--shell-cyan), var(--shell-violet));
  box-shadow: 0 0 14px rgba(62, 229, 255, .8);
  content: "";
}

.site-footer {
  width: 100%;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--shell-line);
  color: #7d8aa6;
  background: transparent;
  font: 400 .66rem/1.55 var(--shell-font);
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  padding-block: 29px 34px;
}

@media (max-width: 760px) {
  html {
    scrollbar-gutter: auto;
  }

  :root {
    --site-gutter: 16px;
    --site-header-height: 60px;
  }

  .nav-wrap {
    gap: 10px;
  }

  .header-actions {
    gap: 8px;
  }

  .brand {
    font-size: 1.04rem;
  }

  .brand-mark {
    flex-basis: 18px;
    width: 18px;
    height: 18px;
  }

  .primary-nav {
    gap: 10px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .primary-nav::-webkit-scrollbar {
    display: none;
  }

  .primary-nav a {
    font-size: .68rem;
  }

  .locale-switcher summary {
    gap: 0;
    min-width: 34px;
    width: 34px;
    padding: 0 7px;
  }

  .locale-switcher summary span,
  .locale-switcher summary i {
    display: none;
  }

  .locale-menu {
    top: calc(100% - 6px);
  }

  html:lang(ja) .primary-nav {
    gap: 8px;
  }

  html:lang(ja) .primary-nav a {
    font-size: .62rem;
  }

  .footer-wrap {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
    padding-block: 23px 28px;
  }
}