/* ===== Nav Dropdown ===== */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle { display: flex; align-items: center; gap: 4px; cursor: pointer; white-space: nowrap; }
.dropdown-arrow { font-size: 10px; transition: transform 0.25s ease; display: inline-block; }

/* 下拉菜单面板 — 强制深色，避免被页面主题覆盖 */
.nav-dropdown-menu {
  display: block;
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  background: #12121e !important;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(99,102,241,0.25) !important;
  border-radius: 12px;
  padding: 6px 0;
  min-width: 200px;
  list-style: none;
  box-shadow: 0 16px 48px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.04);
  z-index: 9999;
  margin: 0;
  /* 延迟显示/隐藏，400ms 给足时间跨越 */
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
  transform: translateX(-50%) translateY(4px);
}

/* 菜单项 */
.nav-dropdown-menu li { padding: 0; margin: 0; }
.nav-dropdown-menu li a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 18px;
  color: rgba(255,255,255,0.72) !important;
  text-decoration: none;
  font-size: 14px; font-weight: 500;
  white-space: nowrap;
  transition: background 0.18s, color 0.18s;
  border-radius: 8px;
  margin: 2px 6px;
}
.nav-dropdown-menu li a:hover {
  background: rgba(99,102,241,0.18) !important;
  color: #fff !important;
}

/* 分割线（可选） */
.nav-dropdown-menu li + li { border-top: 1px solid rgba(255,255,255,0.05); }

/* hover 时显示下拉菜单 */
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown:hover .dropdown-arrow { transform: rotate(180deg); }

/* 透明桥接区域 — 填补父元素与下拉菜单之间的空隙，保持 hover 连续 */
.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 20px;
  background: transparent;
  pointer-events: auto;
}

/* ===== 产品页导航兼容样式 ===== */
/* 兼容 nav-component.js 生成的导航结构 — 与首页保持一致的宽松间距 */
header nav { padding: 16px 0; }
header nav .container { display: flex; align-items: center; justify-content: space-between; }
header nav .nav-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
header nav .nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); flex-shrink: 0; }
header nav .nav-logo-img { height: 36px; }
header nav .nav-logo-text { font-weight: 700; font-size: 18px; white-space: nowrap; }
header nav .nav-links { display: flex; align-items: center; gap: 32px; list-style: none; margin: 0; padding: 0; flex: 1; justify-content: center; }
header nav .nav-links a { color: var(--text-secondary, rgba(255,255,255,0.55)); text-decoration: none; font-size: 14px; font-weight: 400; transition: color 0.2s; white-space: nowrap; }
header nav .nav-links a:hover { color: var(--text-primary, #fff); }
header nav .nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
header nav .btn-nav { background: var(--gradient-cta, linear-gradient(135deg, #f97316 0%, #ef4444 100%)); color: #fff; border: none; padding: 10px 22px; border-radius: 24px; font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; transition: transform 0.2s, box-shadow 0.2s; white-space: nowrap; }
header nav .btn-nav:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(249,115,22,0.4); }
header nav .theme-toggle { background: transparent; color: var(--text, #fff); border: 1px solid rgba(255,255,255,0.15); width: 40px; height: 40px; border-radius: 50%; font-size: 18px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; transition: all 0.2s; flex-shrink: 0; }
header nav .theme-toggle:hover { border-color: rgba(255,255,255,0.35); background: rgba(255,255,255,0.08); }
header nav .nav-mobile-btn { display: none; background: transparent; color: var(--text, #fff); border: none; font-size: 24px; cursor: pointer; padding: 8px 12px; white-space: nowrap; flex-shrink: 0; }
@media (max-width: 768px) {
  header nav .nav-links { display: none; }
  header nav .nav-mobile-btn { display: block; }
}