/* =============================================================
   win11-nav.css —— 全站主导航统一为 index.html 的 Win11 Fluent 风格
   所有颜色/变量都带兜底值，即使 win11.css 未加载或版本不一致也能正常显示。
   仅注入在包含 .nav-links 的页面（由 win11-inject 脚本处理）。
   ============================================================= */

header {
  background: rgba(245, 245, 245, 0.72) !important;
  backdrop-filter: blur(20px) saturate(180%) !important;
  -webkit-backdrop-filter: blur(20px) saturate(180%) !important;
  border-bottom: 1px solid var(--win-border, rgba(0, 0, 0, 0.08)) !important;
  box-shadow: var(--win-shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.06)) !important;
  padding: 0.75rem 0 !important;
  position: fixed !important;
  width: 100% !important;
  top: 0 !important;
  left: 0 !important;
  z-index: 1000 !important;
}

.logo-container {
  display: flex !important;
  align-items: center !important;
  gap: 1rem !important;
}

.logo {
  height: 44px !important;
  width: auto !important;
  border-radius: var(--win-radius-sm, 8px) !important;
  transition: transform var(--win-transition, 200ms cubic-bezier(0.4, 0, 0.2, 1)) !important;
}

.logo:hover {
  transform: scale(1.05) !important;
}

.logo-text {
  color: var(--win-text, #1F1F1F) !important;
  font-size: 1.4rem !important;
  font-weight: 700 !important;
  letter-spacing: -0.3px !important;
}

.nav-links {
  display: flex !important;
  list-style: none !important;
  gap: 0.25rem !important;
  align-items: center !important;
}

.nav-links a {
  color: var(--win-text-secondary, #5c5c5c) !important;
  text-decoration: none !important;
  font-size: 0.95rem !important;
  font-weight: 500 !important;
  padding: 0.5rem 0.875rem !important;
  border-radius: var(--win-radius-sm, 8px) !important;
  position: relative !important;
  transition: all var(--win-transition, 200ms cubic-bezier(0.4, 0, 0.2, 1)) !important;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(0, 120, 212, 0.08) !important;
  color: var(--win-accent, #0078D4) !important;
}

/* 悬停/当前页：从中心向两侧生长的强调色下划线 */
.nav-links a::after {
  content: '' !important;
  position: absolute !important;
  bottom: 2px !important;
  left: 50% !important;
  transform: translateX(-50%) !important;
  width: 0 !important;
  height: 2px !important;
  background: var(--win-accent, #0078D4) !important;
  border-radius: 1px !important;
  transition: width var(--win-transition, 200ms cubic-bezier(0.4, 0, 0.2, 1)) !important;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 20px !important;
}

/* 键盘可达性 */
.nav-links a:focus-visible {
  outline: 2px solid var(--win-accent, #0078D4) !important;
  outline-offset: -2px !important;
}

/* 移动端：单行导航 + 横向滑动，避免 logo 被挤压成竖排 */
@media (max-width: 768px) {
  header {
    padding: 0.5rem 0 !important;
  }
  header nav {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    flex-wrap: nowrap !important;
    gap: 8px !important;
    padding: 0 12px !important;
  }
  .logo-container {
    flex: 0 0 auto !important;
    gap: 0.5rem !important;
  }
  .nav-brand {
    flex: 0 0 auto !important;
    display: flex !important;
    align-items: center !important;
    gap: 0.5rem !important;
    text-decoration: none !important;
  }
  .nav-brand img {
    height: 34px !important;
    width: auto !important;
    border-radius: var(--win-radius-sm, 8px) !important;
  }
  .nav-brand span {
    display: none !important;
  }
  .logo {
    height: 34px !important;
  }
  .logo-text {
    display: none !important;
  }
  .nav-links {
    flex: 1 1 auto !important;
    display: flex !important;
    flex-wrap: nowrap !important;
    justify-content: flex-start !important;
    gap: 0.1rem !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    padding: 2px 0 !important;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  .nav-links a {
    white-space: nowrap !important;
    padding: 0.45rem 0.55rem !important;
    font-size: 0.85rem !important;
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: 0 !important;
  }
  .nav-links a {
    padding: 0.4rem 0.45rem !important;
    font-size: 0.8rem !important;
  }
  .logo {
    height: 30px !important;
  }
  .nav-brand img {
    height: 30px !important;
  }
}