/* ==========================================
   迈科电气 - 导航栏统一样式
   ========================================== */

/* ── 基础导航 ── */
#mainNav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 15px 0;
  transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}

/* 首页透明导航（有 #hero 区块时由 JS 控制） */
#mainNav.nav-transparent {
  background: transparent !important;
  box-shadow: none !important;
  padding: 20px 0;
}

#mainNav.nav-transparent .navbar-brand {
  color: #fff !important;
}

#mainNav.nav-transparent .nav-link {
  color: rgba(255, 255, 255, 0.9) !important;
}

#mainNav.nav-transparent .navbar-toggler i {
  color: #fff !important;
}

/* 滚动后变实底（JS 添加 nav-solid） */
#mainNav.nav-solid {
  background: rgba(255, 255, 255, 0.98) !important;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1) !important;
  padding: 15px 0 !important;
}

#mainNav.nav-solid .navbar-brand {
  color: var(--brand-blue) !important;
}

#mainNav.nav-solid .nav-link {
  color: var(--text-dark) !important;
}

/* ── 品牌名 ── */
.navbar-brand {
  font-size: 24px;
  font-weight: 700;
  color: var(--brand-blue) !important;
  text-decoration: none;
  letter-spacing: 2px;
  transition: color 0.3s ease;
}

/* ── 导航链接 ── */
.nav-link {
  color: var(--text-dark) !important;
  font-size: 15px;
  font-weight: 500;
  padding: 10px 20px !important;
  transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--brand-orange) !important;
}

/* 去掉鼠标点击产生的焦点轮廓（保留键盘导航的焦点样式） */
#mainNav .nav-link:focus:not(:focus-visible),
#mainNav .navbar-brand:focus:not(:focus-visible),
#mainNav .dropdown-toggle:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

/* ── Mega Menu 下拉 ── */
.dropdown-menu {
  background: #fff;
  border: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  border-radius: 0;
  margin-top: 0;
  padding: 0;
}

/* PC 端：全屏宽 Mega Menu */
@media (min-width: 992px) {
  .navbar .dropdown {
    position: static !important;
  }

  .dropdown-menu {
    position: absolute !important;
    left: 0 !important;
    right: 0 !important;
    width: 100% !important;
    min-width: 100% !important;
    top: 100% !important;
    max-width: none !important;
  }
}

/* 移动端下拉 */
@media (max-width: 991px) {
  .dropdown-menu {
    min-width: 100%;
    position: static !important;
    box-shadow: none;
    border: none;
  }
}

/* ── Mega Menu 条目 ── */
.mega-menu-item {
  padding: 28px 30px;
  border-bottom: 1px solid #f0f0f0;
  transition: background 0.2s ease;
  cursor: pointer;
  display: block;
  text-decoration: none;
}

.mega-menu-item:hover {
  background: #fafafa;
}

.mega-menu-item h5 {
  color: var(--brand-blue);
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 16px;
}

.mega-menu-item p {
  color: var(--text-light);
  font-size: 13px;
  margin: 0;
  line-height: 1.5;
}

.mega-menu-item .arrow {
  color: var(--brand-orange);
  font-size: 18px;
  transition: transform 0.2s ease;
}

.mega-menu-item:hover .arrow {
  transform: translateX(3px);
}

/* ── Mega Menu 大类分组标题 ── */
.mega-group-title {
  padding: 14px 30px 10px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b7280;
  background: #f8f9ff;
  border-bottom: 1px solid #e8ecff;
  border-top: 1px solid #e8ecff;
  display: flex;
  align-items: center;
}

.mega-group-title i {
  color: var(--brand-blue);
  font-size: 15px;
}

/* 两列之间加竖线分隔 */
.mega-col:not(:last-child) {
  border-right: 1px solid #f0f0f0;
}

/* ── Mega Menu 底部"查看全部"入口 ── */
.mega-footer {
  padding: 12px 30px;
  background: #f8f9fa;
  border-top: 1px solid #f0f0f0;
  text-align: right;
}

.mega-view-all {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

.mega-view-all:hover {
  color: var(--brand-orange);
}

@media (max-width: 991px) {
  .mega-group-title {
    padding: 10px 15px 8px;
  }
  .mega-col {
    border-right: none !important;
    border-bottom: 1px solid #f0f0f0;
  }
  .mega-footer {
    text-align: center;
  }
}