/* 企业站顶栏 — 手机端菜单按钮与 Logo 分列，避免遮挡 */
.site-net-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid #e7e5e4;
  background: color-mix(in oklab, #fafaf9 95%, transparent);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.site-net-header-inner {
  max-width: 80rem;
  margin-inline: auto;
  padding: 0.75rem 1rem 0.875rem;
}

.site-net-topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 0.75rem;
}

.site-net-topbar-side {
  display: none;
}

.site-net-brand {
  min-width: 0;
  text-align: center;
}

.site-net-brand-link {
  display: inline-block;
  max-width: 100%;
}

.site-net-brand-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 0.75rem;
  min-width: 0;
}

.site-net-logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 9999px;
  background: #000;
}

.site-net-logo-letter {
  font-size: 0.875rem;
  font-weight: 300;
  color: #fff;
}

.site-net-brand-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  line-height: 1.2;
  white-space: nowrap;
}

.site-net-brand-visual {
  margin: 0;
  line-height: 0;
}

.site-net-brand-row--image {
  gap: 0;
}

.site-net-logo-img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-inline: auto;
}

.site-net-footer-brand .site-net-logo-img {
  margin-inline: auto;
}

.site-net-footer-brand .site-net-brand-title {
  font-size: 1.5rem;
}

.site-net-brand-tagline {
  margin: 0.2rem 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: #78716c;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 0;
  border-radius: 0.375rem;
  background: transparent;
  color: #1c1917;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}

.site-menu-btn:hover {
  background: #f5f5f4;
}

.site-menu-icon {
  display: block;
  width: 1.35rem;
  height: 1.35rem;
}

.site-menu-icon line {
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
}

.site-net-desktop-nav {
  display: none;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 0.75rem;
  padding-bottom: 0.25rem;
}

.site-net-desktop-nav a,
.site-mobile-nav a {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #78716c;
  transition: color 0.2s ease;
}

.site-net-desktop-nav a:hover,
.site-mobile-nav a:hover,
.site-mobile-nav a:active {
  color: #1c1917;
}

.site-mobile-nav {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  padding-bottom: 0.25rem;
  border-top: 1px solid #e7e5e4;
}

.site-mobile-nav.is-open {
  display: flex !important;
}

.site-mobile-nav a {
  text-align: left;
  font-size: 0.875rem;
}

.site-net-footer-brand {
  display: flex;
  justify-content: center;
}

.site-net-logo-mark--footer {
  width: 3rem;
  height: 3rem;
}

@media (max-width: 767px) {
  .site-net-header-inner {
    padding: 0.75rem 0.35rem 0.875rem 0.75rem;
  }

  .site-net-topbar {
    column-gap: 0.35rem;
  }

  .site-net-brand {
    transform: translateX(0.65rem);
  }

  .site-menu-btn {
    margin-right: -0.3rem;
  }
}

@media (min-width: 768px) {
  .site-net-header-inner {
    padding: 1rem 1.5rem;
  }

  .site-net-topbar {
    grid-template-columns: 1fr;
    column-gap: 0;
  }

  .site-net-brand {
    transform: none;
  }

  .site-menu-btn {
    display: none;
  }

  .site-net-logo-mark {
    width: 2.5rem;
    height: 2.5rem;
  }

  .site-net-brand-title {
    font-size: 1.5rem;
    letter-spacing: 0.3em;
  }

  .site-net-brand-tagline {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
  }

  .site-net-desktop-nav {
    display: flex;
  }

  .site-net-desktop-nav a {
    font-size: 0.75rem;
    letter-spacing: 0.05em;
  }

  .site-mobile-nav {
    display: none !important;
  }
}