:root {
  --case-nav-canvas: #050708;
  --case-nav-ink: #e5e9e8;
  --case-nav-muted: #8e9699;
  --case-nav-accent: #a58b63;
  --case-nav-line: rgba(229, 233, 232, 0.15);
  --case-nav-button: #f3f4ed;
  --case-nav-button-ink: #10110f;
}

header.topbar {
  position: fixed !important;
  z-index: 80 !important;
  top: 16px !important;
  left: 50% !important;
  right: auto !important;
  width: min(1120px, calc(100% - 36px)) !important;
  max-width: none !important;
  min-height: 62px !important;
  height: auto !important;
  margin: 0 !important;
  padding: 8px 10px 8px 20px !important;
  transform: translateX(-50%) !important;
  display: grid !important;
  grid-template-columns: minmax(142px, 1fr) auto minmax(142px, 1fr) !important;
  align-items: center !important;
  gap: 20px !important;
  border: 1px solid var(--case-nav-line) !important;
  border-radius: 999px !important;
  background: rgba(5, 7, 8, 0.92) !important;
  color: var(--case-nav-ink) !important;
  box-shadow: 0 18px 58px rgba(0, 0, 0, 0.18), inset 0 1px rgba(255, 255, 255, 0.025) !important;
  -webkit-backdrop-filter: blur(16px) saturate(115%) !important;
  backdrop-filter: blur(16px) saturate(115%) !important;
  isolation: isolate;
}

header.topbar .brand {
  position: static !important;
  justify-self: start !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 10px !important;
  min-width: 0 !important;
  min-height: 44px !important;
  margin: 0 !important;
  padding: 0 !important;
  color: var(--case-nav-ink) !important;
  font-family: "Syne", "Noto Sans SC", "Microsoft YaHei", sans-serif !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  line-height: 1 !important;
  letter-spacing: -0.01em !important;
  text-decoration: none !important;
  white-space: nowrap !important;
}

header.topbar .brand img {
  display: block !important;
  width: 24px !important;
  height: 24px !important;
  max-width: none !important;
  margin: 0 !important;
  object-fit: contain !important;
  opacity: 0.9;
}

header.topbar nav,
header.topbar .topnav,
header.topbar .top-links {
  position: static !important;
  justify-self: center !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 24px !important;
  min-width: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  overflow: visible !important;
  white-space: nowrap !important;
}

header.topbar nav a,
header.topbar .topnav a,
header.topbar .top-links a {
  position: relative !important;
  display: inline-flex !important;
  align-items: center !important;
  min-height: 44px !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  color: var(--case-nav-muted) !important;
  background: transparent !important;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif !important;
  font-size: 12px !important;
  font-weight: 400 !important;
  line-height: 1 !important;
  letter-spacing: 0 !important;
  text-decoration: none !important;
  transition: color 180ms ease !important;
}

header.topbar nav a::after,
header.topbar .topnav a::after,
header.topbar .top-links a::after {
  content: "" !important;
  position: absolute !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 5px !important;
  height: 1px !important;
  background: var(--case-nav-accent) !important;
  transform: scaleX(0) !important;
  transform-origin: right !important;
  transition: transform 180ms ease !important;
}

header.topbar nav a:hover,
header.topbar nav a:focus-visible,
header.topbar nav a.is-active,
header.topbar nav a.is-current,
header.topbar nav a[aria-current],
header.topbar .top-links a:hover,
header.topbar .top-links a:focus-visible {
  color: var(--case-nav-ink) !important;
}

header.topbar nav a.is-active::after,
header.topbar nav a.is-current::after,
header.topbar nav a[aria-current]::after,
header.topbar .top-links a:hover::after,
header.topbar .top-links a:focus-visible::after {
  transform: scaleX(1) !important;
  transform-origin: left !important;
}

header.topbar .return-link,
header.topbar .prototype-note {
  position: static !important;
  justify-self: end !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 0 !important;
  min-height: 44px !important;
  height: 44px !important;
  margin: 0 !important;
  padding: 0 18px !important;
  border: 0 !important;
  border-radius: 999px !important;
  background: var(--case-nav-button) !important;
  color: var(--case-nav-button-ink) !important;
  box-shadow: none !important;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif !important;
  font-size: 12px !important;
  font-weight: 400 !important;
  line-height: normal !important;
  letter-spacing: 0 !important;
  text-decoration: none !important;
  white-space: nowrap !important;
  transition: background-color 180ms ease, transform 180ms ease !important;
}

header.topbar .return-link:hover,
header.topbar .return-link:focus-visible,
header.topbar .prototype-note:hover,
header.topbar .prototype-note:focus-visible {
  background: #d8c19e !important;
  color: var(--case-nav-button-ink) !important;
  transform: translateY(-1px) !important;
}

header.topbar a:focus-visible {
  outline: 2px solid var(--case-nav-accent) !important;
  outline-offset: 3px !important;
}

@media (max-width: 1100px) {
  header.topbar {
    grid-template-columns: minmax(128px, 1fr) auto minmax(128px, 1fr) !important;
    gap: 14px !important;
  }

  header.topbar nav,
  header.topbar .topnav,
  header.topbar .top-links {
    gap: 16px !important;
  }

  header.topbar nav a,
  header.topbar .topnav a,
  header.topbar .top-links a {
    font-size: 11px !important;
  }
}

@media (max-width: 800px) {
  header.topbar {
    top: 10px !important;
    width: calc(100% - 20px) !important;
    min-height: 56px !important;
    grid-template-columns: minmax(0, 1fr) auto !important;
    gap: 12px !important;
    padding: 6px 6px 6px 12px !important;
  }

  header.topbar nav,
  header.topbar .topnav,
  header.topbar .top-links {
    display: none !important;
  }

  header.topbar .brand {
    min-height: 44px !important;
    font-size: 12px !important;
  }

  header.topbar .return-link,
  header.topbar .prototype-note {
    min-height: 44px !important;
    height: 44px !important;
    padding-inline: 15px !important;
    font-size: 12px !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  header.topbar *,
  header.topbar *::after {
    transition: none !important;
  }
}