/* ====== 滚动揭示动画 ====== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====== 导航滚动阴影 ====== */
.header-scrolled {
  box-shadow: 0 1px 8px rgba(0,0,0,0.12);
}

/* mega-menu-wrapper 向下延伸 hover 区域，覆盖 ::before 透明桥接层 */
#site-header .mega-menu-wrapper {
  padding-bottom: 12px;
  margin-bottom: -12px;
}

/* ====== Mega Menu ====== */
.mega-menu-wrapper {
  position: relative;
}
.mega-menu {
  display: none;
  position: absolute;
  top: 100%;          /* 紧贴按钮底部，无间隙 */
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 8px 32px rgba(10,45,110,0.13);
  z-index: 200;
  padding: 8px 16px 16px; /* 顶部 8px 让视觉有间距 */
  min-width: 288px;
}
/* 透明桥接层：填补 header 底边到菜单顶部的触发死区 */
.mega-menu::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
  background: transparent;
}
.mega-menu-wrapper:hover .mega-menu,
.mega-menu-wrapper.open .mega-menu {
  display: block;
}
/* Rotate chevron on open */
.mega-menu-wrapper:hover #mega-chevron {
  transform: rotate(180deg);
}

/* ====== 自定义滚动条 ====== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f0f4fa; }
::-webkit-scrollbar-thumb { background: #1a7ad440; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #1a7ad480; }

/* ====== Hero 区域渐变背景 ====== */
.hero-gradient {
  background: linear-gradient(135deg, #0a2d6e 0%, #1a3d8a 60%, #1a5aa0 100%);
}

/* ====== 卡片 hover 效果 ====== */
.card-hover {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10,45,110,0.12);
}

/* ====== 按钮过渡 ====== */
.btn-transition {
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}
.btn-transition:hover {
  transform: translateY(-1px);
}

/* ====== 产品网格图标圆圈 ====== */
.icon-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f0f4fa;
}

/* ====== 信任条数字 ====== */
.trust-number {
  font-size: 2rem;
  font-weight: 700;
  color: #1a7ad4;
  line-height: 1;
}

/* ====== Banner 区域 ====== */
.page-banner {
  background: linear-gradient(135deg, #0a2d6e 0%, #1a3d8a 100%);
  padding: 80px 0 60px;
}

/* ====== 参数表格 ====== */
.param-table th {
  background: #f0f4fa;
  color: #0a2d6e;
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
  font-size: 14px;
}
.param-table td {
  padding: 9px 14px;
  font-size: 14px;
  color: #1e2a3a;
  border-bottom: 1px solid #e2e8f0;
}
.param-table tr:last-child td {
  border-bottom: none;
}

/* ====== 标签云 ====== */
.tag-pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: #f0f4fa;
  color: #0a2d6e;
  font-size: 13px;
  border: 1px solid #c9d8ee;
  margin: 4px;
}

/* ====== 移动端菜单动画 ====== */
#mobile-menu {
  transition: max-height 0.3s ease;
}

/* ====== 九防网格 ====== */
.defense-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 640px) {
  .defense-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ====== 功能导航网格 ====== */
.func-nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

@media (max-width: 768px) {
  .func-nav-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ====== 下拉移动端展开 ====== */
.mobile-submenu {
  display: none;
}
.mobile-submenu.open {
  display: block;
}