/* ========================================
   Navigation Tech Aesthetic Enhancement
   科技审美导航优化 - 不改变菜单内容
   ======================================== */

/* ========================================
   1. Header Glassmorphism Effect
   毛玻璃效果头部
   ======================================== */
.site-header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 102, 204, 0.08);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 4px 20px rgba(0, 102, 204, 0.06);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 8px 30px rgba(0, 102, 204, 0.1);
}

/* ========================================
   2. Navigation Link Enhancement
   导航链接科技感增强
   ======================================== */
.primary-menu > li > a {
    position: relative;
    font-weight: 600;
    letter-spacing: 0.3px;
    padding: 0.75rem 1.25rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 底部发光指示器 */
.primary-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), var(--primary-light), transparent);
    border-radius: 2px;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.primary-menu > li:hover > a::after {
    transform: translateX(-50%) scaleX(1);
    opacity: 1;
}

.primary-menu > li:hover > a {
    color: var(--primary-color);
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.06) 0%, rgba(0, 191, 255, 0.04) 100%);
    border-radius: 10px;
}

/* ========================================
   3. Dropdown Menu Tech Style
   下拉菜单科技感
   ======================================== */
.primary-menu .sub-menu {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 102, 204, 0.1);
    border-radius: 16px;
    box-shadow: 
        0 4px 6px rgba(0, 0, 0, 0.03),
        0 20px 60px rgba(0, 102, 204, 0.15);
    padding: 0.75rem;
    min-width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.98);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.primary-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Dropdown arrow decoration */
.primary-menu .sub-menu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 2rem;
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(0, 102, 204, 0.12);
    border-bottom: none;
    border-right: none;
    transform: rotate(45deg);
}

/* 下拉菜单项 */
.primary-menu .sub-menu li {
    margin: 0;
}

/* 二级菜单文字样式 */
.primary-menu .sub-menu > li > a {
    position: relative;
    padding: 12px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-medium);
    border-radius: 8px;
    transition: all 0.2s ease;
    overflow: hidden;
}

/* 左侧发光条 */
.primary-menu .sub-menu > li > a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 60%;
    background: linear-gradient(180deg, var(--primary-light), var(--primary-color));
    border-radius: 0 2px 2px 0;
    transition: transform 0.2s ease;
}

.primary-menu .sub-menu > li > a:hover {
    color: var(--primary-color);
    background: linear-gradient(90deg, rgba(0, 102, 204, 0.06), rgba(0, 102, 204, 0.02));
    padding-left: 20px;
}

.primary-menu .sub-menu > li > a:hover::before {
    transform: translateY(-50%) scaleY(1);
}

/* ========================================
   4. Third-level Submenu - Click/Hover Trigger
   三级菜单 - 需要点击或悬停才显示
   ======================================== */

/* 二级菜单项（有子菜单的） */
.primary-menu .sub-menu li.menu-item-has-children {
    position: relative;
}

/* 三级菜单初始状态 - 隐藏 */
.primary-menu .sub-menu .sub-menu {
    position: absolute;
    left: 100%;
    top: 0;
    margin-left: 4px;
    border-radius: 12px;
    min-width: 260px;
    transform: translateX(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
    /* 默认不显示，只有悬停父级时才显示 */
    display: none;
}

/* 悬停二级菜单项时显示三级菜单 */
.primary-menu .sub-menu li.menu-item-has-children:hover > .sub-menu,
.primary-menu .sub-menu li.menu-item-has-children:focus-within > .sub-menu {
    display: block;
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
}

/* 三级菜单文字样式 - 比二级菜单小 */
.primary-menu .sub-menu .sub-menu a {
    font-size: 0.875rem;  /* 14px，比二级菜单的 15px 小 */
    padding: 10px 14px;
    font-weight: 400;
    color: var(--text-light);
}

.primary-menu .sub-menu .sub-menu a:hover {
    color: var(--primary-color);
    padding-left: 18px;
}

/* 三级菜单左侧指示条更细 */
.primary-menu .sub-menu .sub-menu a::before {
    width: 2px;
    height: 50%;
}

/* 二级菜单箭头指示器 */
.primary-menu .sub-menu > li.menu-item-has-children > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.primary-menu .sub-menu > li.menu-item-has-children > a::after {
    content: '›';
    font-size: 16px;
    opacity: 0.5;
    margin-left: 8px;
    transition: all 0.2s ease;
    color: var(--text-light);
}

.primary-menu .sub-menu > li.menu-item-has-children:hover > a::after {
    opacity: 1;
    transform: translateX(3px);
    color: var(--primary-color);
}

/* 移除三级菜单的箭头 */
.primary-menu .sub-menu .sub-menu::before {
    display: none;
}

/* ========================================
   5. Mega Menu Tech Enhancement
   大型菜单科技风格
   ======================================== */
.mega-menu-content {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 102, 204, 0.1);
    border-radius: 16px;
    box-shadow: 
        0 4px 6px rgba(0, 0, 0, 0.03),
        0 20px 60px rgba(0, 102, 204, 0.15);
    padding: 2rem;
    gap: 1.5rem;
}

.mega-menu-column {
    padding: 1.5rem;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.03) 0%, rgba(0, 191, 255, 0.02) 100%);
    border: 1px solid rgba(0, 102, 204, 0.06);
    transition: all 0.3s ease;
}

.mega-menu-column:hover {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.06) 0%, rgba(0, 191, 255, 0.04) 100%);
    border-color: rgba(0, 102, 204, 0.12);
    transform: translateY(-2px);
}

.mega-menu-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-dark);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid;
    border-image: linear-gradient(90deg, var(--primary-color), var(--primary-light)) 1;
    border-image-slice: 0 0 2 0;
    transition: all 0.3s ease;
}

.mega-menu-column:hover .mega-menu-title {
    color: var(--primary-color);
}

/* ========================================
   6. Dropdown Arrow Animation
   下拉箭头动画效果
   ======================================== */
.dropdown-arrow {
    display: inline-block;
    margin-left: 6px;
    font-size: 10px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0.7;
}

.menu-item-has-children:hover .dropdown-arrow {
    transform: rotate(180deg);
    opacity: 1;
}

/* ========================================
   7. Button Tech Effects
   按钮科技光效
   ======================================== */
.header-actions .btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Primary Button Glow */
.header-actions .btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.header-actions .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 102, 204, 0.4);
}

/* Secondary Button Tech Border */
.header-actions .btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 1.5px solid rgba(0, 102, 204, 0.3);
    position: relative;
    overflow: hidden;
}

.header-actions .btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 204, 0.1), transparent);
    transition: left 0.5s ease;
}

.header-actions .btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(0, 102, 204, 0.04);
}

.header-actions .btn-secondary:hover::before {
    left: 100%;
}

/* ========================================
   8. Logo Enhancement
   Logo 科技发光效果
   ======================================== */
.site-logo a {
    position: relative;
}

.logo-text {
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--text-dark) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-highlight {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   9. Mobile Menu Tech Style
   移动端菜单科技风格
   ======================================== */
@media screen and (max-width: 767px) {
    .primary-navigation {
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0, 102, 204, 0.1);
    }
    
    .primary-menu > li > a {
        font-weight: 600;
        border-bottom: 1px solid rgba(0, 102, 204, 0.06);
    }
    
    .primary-menu .sub-menu {
        background: rgba(0, 102, 204, 0.02);
        border-left: 3px solid var(--primary-color);
        border-radius: 0 8px 8px 0;
    }
    
    /* Mobile Menu Toggle Animation */
    .menu-toggle {
        width: 28px;
        height: 22px;
    }
    
    .menu-toggle span {
        height: 2.5px;
        border-radius: 2px;
        background: linear-gradient(90deg, var(--text-dark), var(--primary-color));
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* Mobile: third-level menu stacked */
    .primary-menu .sub-menu .sub-menu {
        position: static;
        margin-left: 20px;
        margin-top: 8px;
        transform: none;
        opacity: 1;
        visibility: visible;
        display: block;
        box-shadow: none;
        border: none;
        background: rgba(0, 102, 204, 0.03);
    }
    
    /* Mobile: 三级菜单字号更小 */
    .primary-menu .sub-menu .sub-menu a {
        font-size: 0.8125rem;  /* 13px */
        padding: 8px 12px;
    }
    
    .primary-menu .sub-menu > li.menu-item-has-children > a::after {
        content: '▼';
        font-size: 10px;
    }
}