/* ==========================================
   主导航基础样式 (修改为与 Footer 呼应的深蓝渐变)
   ========================================== */
.site-header {
    /* 替换为与 Footer 一致的深蓝渐变背景 */
    background: linear-gradient(135deg, #0a1e36 0%, #071729 100%);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); /* 阴影稍微加深一点点，让边缘更清晰 */
    position: relative;
    z-index: 1000;
}
.site-header.is-sticky {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 9999;
}
.nav-placeholder { width: 100%; height: 0; }

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
}
.site-logo { height: 45px; width: auto; display: block; }

.main-nav ul {
    list-style: none; margin: 0; padding: 0;
    display: flex; align-items: center; gap: 20px; 
}
.main-nav li { position: relative; margin: 0; }

.main-nav a {
    color: #e2e8f0; /* 文字颜色改为稍微柔和的白色，在深色背景下更舒服 */
    text-decoration: none; font-size: 15px;
    font-weight: 500; display: block; white-space: nowrap;
    transition: color 0.2s; padding: 10px 0;
}
.main-nav a:hover { color: #38bdf8; }

/* ==========================================
   极简圆形图标链接样式 (电脑端与手机端通用)
   ========================================== */
.main-nav .nav-icon-link {
    margin: 0 2px;
}
.main-nav .nav-icon-link a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    /* 深色背景下，图标背景改成半透明白色，看起来更高级 */
    background: rgba(255, 255, 255, 0.1); 
    color: #ffffff;
    font-size: 18px;
    padding: 0; 
    transition: all 0.3s ease;
}
.main-nav .nav-icon-link a:hover {
    background: #38bdf8;
    color: #0a1e36; /* 悬停时文字/图标变成深蓝色 */
    transform: translateY(-2px);
}

/* 电脑端默认隐藏专属手机端顶部图标 */
.mobile-top-icons {
    display: none;
}

/* 报价按钮样式 */
.main-nav .nav-quote-btn {
    background: #38bdf8; color: #0a1e36;
    padding: 10px 24px; border-radius: 4px; font-weight: 700;
    margin-left: 8px; transition: all 0.2s;
}
.main-nav .nav-quote-btn:hover { background: #0ea5e9; color: #fff; transform: translateY(-2px); }

/* 下拉菜单触控区与高级箭头样式 */
.dropdown-row { 
    display: flex; 
    align-items: center; 
    gap: 6px; 
    cursor: pointer;
}
.dropdown-toggle { 
    display: block; 
}
.pc-arrow { 
    display: inline-block; 
    font-size: 14px; 
    color: #e2e8f0 !important; /* 箭头颜色适配深色背景 */
    transition: transform 0.3s ease, color 0.2s ease; 
    user-select: none;
}
.dropdown-row:hover .dropdown-toggle,
.dropdown-row:hover .pc-arrow {
    color: #38bdf8 !important;
}

.mobile-menu-toggle { display: none; }
.mobile-menu-close { display: none; }
.mobile-nav-header { display: none; }

/* ==========================================
   电脑端（≥ 1025px）：下拉菜单逻辑
   ========================================== */
@media screen and (min-width: 1025px) {
    .dropdown-menu {
        display: none !important;
        position: absolute;
        top: 100%;
        left: 0;
        background: #fff;
        box-shadow: 0 8px 24px rgba(0,0,0,0.15);
        border-radius: 6px;
        min-width: 260px;
        flex-direction: column;
        padding: 8px 0 !important; 
        gap: 0 !important;
        margin: 0 !important;
        z-index: 999;
    }
    
    .dropdown:hover > .dropdown-menu { display: flex !important; }
    .dropdown:not(:hover) > .dropdown-menu { display: none !important; }
    .dropdown:hover .pc-arrow { transform: rotate(180deg); }
    
    .site-header .main-nav ul li.dropdown ul.dropdown-menu li {
        margin: 0 !important; 
        padding: 0 !important; 
        height: 40px !important;        
        min-height: 40px !important;    
        max-height: 40px !important;    
        line-height: 40px !important;   
        width: 100%; 
        border: none !important;
        overflow: hidden !important;    
    }
    
    .site-header .main-nav ul li.dropdown ul.dropdown-menu li a {
        box-sizing: border-box !important;
        font-size: 14px !important;    
        height: 40px !important;       
        line-height: 40px !important;  
        padding: 0 20px !important;    
        margin: 0 !important;
        display: block !important;
        color: #333 !important;
        font-weight: 400 !important;
        white-space: nowrap;
        background: transparent !important;
    }
    
    .site-header .main-nav ul li.dropdown ul.dropdown-menu li a:hover {
        background: #f4f6f9 !important;
        color: #1e3c72 !important; /* 悬停变色 */
    }
}

/* ==========================================
   平板 + 手机端（≤ 1024px）：移动端适配
   ========================================== */
@media screen and (max-width: 1024px) {
    .nav-container {
        position: relative !important;
        display: flex !important;
        align-items: center !important;
        padding: 0 15px !important;
        min-height: 60px;
    }
    .logo { width: auto !important; padding-right: 0 !important; }
    .site-logo { height: 32px !important; width: auto !important; }

    /* 手机端顶部：显示快捷联系图标（位于三条杠左侧） */
    .mobile-top-icons {
        display: flex !important;
        align-items: center !important;
        gap: 12px !important;
        margin-left: auto !important;
        margin-right: 50px !important; 
        z-index: 1101;
    }
    .mobile-top-icons a {
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        width: 32px !important;
        height: 32px !important;
        border-radius: 50% !important;
        background: rgba(255, 255, 255, 0.15) !important;
        color: #ffffff !important;
        font-size: 15px !important;
        text-decoration: none !important;
    }

    /* 三条杠按钮定位 */
    .mobile-menu-toggle {
        display: block !important;
        position: absolute !important;
        right: 15px !important;
        top: 50% !important;
        transform: translateY(-50%) !important;
        background: none !important;
        border: none !important;
        cursor: pointer !important;
        padding: 5px !important;
        z-index: 1101;
    }
    .mobile-menu-toggle span {
        display: block !important;
        width: 25px !important; height: 2px !important;
        background: #fff !important;
        margin: 5px 0 !important;
        transition: 0.3s !important;
        border-radius: 1px !important;
    }

    /* 侧边栏宽度与定位 */
    .main-nav {
        position: fixed !important;
        top: 0 !important; 
        right: -300px !important;
        width: 100% !important; 
        max-width: 300px !important;
        height: 100vh !important;
        background: #fff !important;
        box-shadow: -5px 0 25px rgba(0,0,0,0.15) !important;
        transition: right 0.35s ease-in-out !important;
        z-index: 1200 !important; 
        overflow-y: auto !important;
        display: flex !important; 
        flex-direction: column !important;
        margin: 0 !important; 
        padding: 0 !important;
        box-sizing: border-box !important;
    }
    .main-nav.active { right: 0 !important; }

    .mobile-nav-header {
        display: flex !important;
        justify-content: flex-end !important;
        padding: 15px 20px !important;
        border-bottom: 1px solid #f1f1f1 !important;
        background: #fff !important;
    }
    .mobile-menu-close {
        display: block !important;
        background: none !important; border: none !important;
        font-size: 24px !important; color: #333 !important; cursor: pointer !important;
    }

    /* 侧边栏列表垂直排列 */
    .main-nav ul {
        display: flex !important;
        flex-direction: column !important;
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        list-style: none !important;
    }
    .main-nav > ul > li {
        width: 100% !important;
        margin: 0 !important;
        border-bottom: 1px solid #f1f1f1 !important;
        position: relative;
    }

    /* 手机端侧边栏中隐藏电脑端的行内图标，避免重复 */
    .main-nav .nav-icon-link {
        display: none !important;
    }

    .main-nav .dropdown-menu li {
        margin: 0 !important; padding: 0 !important;
        height: auto !important; min-height: 0 !important;
        border-bottom: none !important; 
    }

    .dropdown-row {
        display: flex !important; align-items: center !important;
        justify-content: space-between !important; width: 100% !important;
        background: #fff !important;
    }

    .main-nav .dropdown-toggle, .main-nav > ul > li > a {
        display: block !important; flex: 1 !important;
        padding: 16px 20px !important; font-size: 16px !important;
        color: #333 !important; text-decoration: none !important;
        background: #fff !important; font-weight: 500 !important;
    }

    .main-nav .nav-quote-btn {
        display: block !important;
        background: #38bdf8 !important; color: #0a1e36 !important;
        text-align: center !important; border-radius: 0 !important;
        font-weight: 700 !important; margin-left: 0 !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }

    /* 移动端下拉菜单 */
    .main-nav .dropdown-menu {
        display: none !important; position: static !important;
        box-shadow: none !important; background: #f9fafb !important;
        flex-direction: column !important; padding: 0 !important; gap: 0 !important;
        border-radius: 0 !important; width: 100% !important;
        border-top: 1px solid #e5e7eb !important;
    }
    .main-nav .dropdown.open > .dropdown-menu { display: flex !important; }

    /* 移动端箭头适配 */
    .dropdown-row .pc-arrow {
        display: flex !important; align-items: center !important;
        justify-content: center !important; font-size: 20px !important;
        color: #999 !important; transition: transform 0.3s ease !important;
        padding: 16px 20px !important; cursor: pointer !important;
        user-select: none !important; background: #fff !important; line-height: 1 !important;
    }
    .main-nav .dropdown.open .pc-arrow { transform: rotate(90deg); color: #38bdf8 !important; }
    
    .dropdown-row:hover .dropdown-toggle { color: #333 !important; }
    .dropdown-row:hover .pc-arrow { color: #999 !important; }
    .main-nav .dropdown.open:hover .pc-arrow { color: #38bdf8 !important; }

    .main-nav .dropdown-menu a {
        padding: 12px 20px 12px 35px !important; font-size: 15px !important; 
        line-height: 1.5 !important; margin: 0 !important; min-height: 0 !important;
        color: #666 !important; background: #f9fafb !important;
        border-bottom: 1px solid #f1f5f9 !important; font-weight: 400 !important;
    }
}

/* 强制所有页面统一使用深蓝渐变导航栏 */
.site-header {
    background: linear-gradient(135deg, #0a1e36 0%, #071729 100%) !important;
}