/* =========================================
           1. 基础设置与全局变量
        ========================================= */
        :root {
            --auth-blue: #1e3a8a; --auth-blue-dark: #172554;
            --eco-green: #059669; --warn-yellow: #f59e0b;
            --warn-yellow-hover: #d97706; --text-main: #1e293b;
            --text-light: #64748b; --bg-gray: #f1f5f9;
            --white: #ffffff; --border-color: #e2e8f0;
            --transition: all 0.3s ease-in-out;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; scroll-padding-top: 90px; }
        
        /* 【已修复】：彻底移除 body { padding-bottom: 60px; } 解决底部被顶起的问题 */
        body { font-family: 'Noto Sans SC', sans-serif; color: var(--text-main); line-height: 1.6; background-color: var(--bg-gray); }
        
        img { max-width: 100%; height: auto; display: block; border: none; }
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        a { text-decoration: none; transition: var(--transition); }
        .text-center { text-align: center; }

        /* =========================================
           2. 核心组件 (按钮 & 截断引擎)
        ========================================= */
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 28px; font-weight: 700; border-radius: 4px; cursor: pointer; border: none; letter-spacing: 0.5px; transition: var(--transition); }
        .btn-warning { background-color: var(--warn-yellow); color: var(--white); box-shadow: 0 4px 6px rgba(245, 158, 11, 0.2); }
        .btn-warning:hover { background-color: var(--warn-yellow-hover); transform: translateY(-2px); box-shadow: 0 6px 15px rgba(245, 158, 11, 0.3); }
        .btn-outline-light { background-color: rgba(255,255,255,0.1); color: var(--white); border: 2px solid var(--white); backdrop-filter: blur(4px); }
        .btn-outline-light:hover { background-color: var(--white); color: var(--auth-blue); }
        .btn-outline { background-color: transparent; color: var(--auth-blue); border: 1px solid var(--auth-blue); }
        .btn-outline:hover { background-color: var(--auth-blue); color: var(--white); transform: translateY(-2px); box-shadow: 0 4px 10px rgba(30, 58, 138, 0.15); }
        .btn-outline-dark { background-color: transparent; color: var(--auth-blue); border: 2px solid var(--auth-blue); font-weight: 700; }
        .btn-outline-dark:hover { background-color: var(--auth-blue); color: var(--white); }
        .btn-large { padding: 16px 36px; font-size: 1.1rem; }
        
        .intro-text-clamp { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; text-overflow: ellipsis; white-space: normal; }

/* =========================================
   顶部深色状态条 (Top Bar - PC端终极质感版)
========================================= */
.top-bar {
    background-color: var(--auth-blue-dark);
    color: #cbd5e1;
    font-size: 0.85rem;
    padding: 8px 0; /* 微微缩小上下内边距，让整个黑条更紧凑精致 */
    border-bottom: 1px solid rgba(255, 255, 255, 0.08); 
}

.top-bar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 左侧：企业实力标签 */
.top-bar-left span {
    display: inline-flex;
    align-items: center;
    letter-spacing: 0.5px;
}
.top-bar-left i {
    color: var(--eco-green); 
    margin-right: 6px;
    font-size: 1rem;
}

.top-bar-right {
    display: flex;
    align-items: center;
}

/* 基础文字与链接格式 */
.top-text, .top-link, .top-phone {
    display: inline-flex;
    align-items: center;
    color: #cbd5e1;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); /* 更丝滑的高级过渡动画 */
    text-decoration: none;
    white-space: nowrap; 
}
.top-text i, .top-link i, .top-phone i {
    margin-right: 6px;
    font-size: 0.95rem;
}

/* --- 💎 改进 1：文本展示区（静态） --- */
.top-text i { 
    color: var(--eco-green); 
}

/* --- 💎 改进 2：下载链接（增加隐形包裹感） --- */
.top-link {
    padding: 4px 10px; /* 增加内边距 */
    border-radius: 4px; /* 小圆角 */
    margin: 0 -10px; /* 抵消内边距，不破坏整体排版对齐 */
}
.top-link i { 
    color: var(--eco-green); 
    transition: var(--transition); 
}
.top-link:hover { 
    color: var(--white); 
    background-color: rgba(255, 255, 255, 0.08); /* 悬浮时浮现淡淡的白底色块 */
}
.top-link:hover i { 
    color: var(--warn-yellow); 
}

/* --- 💎 改进 3：销售电话（最高优转化设计：发光胶囊） --- */
.top-phone {
    font-weight: 700;
    color: var(--warn-yellow); /* 默认黄色字体 */
    letter-spacing: 0.5px;
    background-color: rgba(245, 158, 11, 0.1); /* 默认带有一层极淡的黄色背景，像发光一样 */
    padding: 4px 14px;
    border-radius: 20px; /* 胶囊形状，明确区分它是按钮而不是文本 */
    border: 1px solid rgba(245, 158, 11, 0.2);
}
.top-phone:hover {
    background-color: var(--warn-yellow); /* 悬浮时填满黄色 */
    color: var(--white); /* 文字反白 */
    box-shadow: 0 4px 10px rgba(245, 158, 11, 0.2); /* 微微浮起的光晕 */
}
.top-phone:hover i {
    color: var(--white);
}

/* 竖线分割符 */
.divider {
    color: #cbd5e1;
    opacity: 0.25; 
    margin: 0 16px; /* 进一步拉开间隙，提升呼吸感 */
    font-size: 0.8rem;
    font-weight: 300;
}

/* --- 💎 改进 4：防撞车安全机制 (应对 12-14寸 笔记本屏幕) --- */
@media (max-width: 1250px) {
    .top-bar { font-size: 0.8rem; } /* 字体整体微缩 */
    .top-text i, .top-link i, .top-phone i { font-size: 0.85rem; }
    .divider { margin: 0 10px; } /* 缩小间距，为内容腾出空间 */
    .top-phone { padding: 4px 10px; letter-spacing: 0; }
}
        /* =========================================
           3. 导航区域 (Header & Topbar)
        ========================================= */
        .main-header { background-color: var(--white); box-shadow: 0 4px 20px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
        .header-inner { display: flex; justify-content: space-between; align-items: center; height: 85px; }
        .logo h1 { font-size: 1.8rem; color: var(--auth-blue); font-weight: 900; letter-spacing: 1px; }
        .logo span { color: var(--eco-green); }
        .logo .logo-sub { font-size: 0.8rem; color: var(--text-light); display: block; letter-spacing: 2px; font-weight: 500;}

        /* 完全匹配官方原生的 ul > li > ul 导航下拉解析结构 */
        .main-nav > ul { display: flex; list-style: none; }
        .main-nav > ul > li { margin: 0 20px; }
        .main-nav > ul > li > a { display: flex; align-items: center; gap: 8px; color: var(--text-main); font-weight: 700; font-size: 1.05rem; padding-bottom: 5px;}
        .main-nav > ul > li > a i { font-size: 1.1rem; transition: color 0.3s ease; }
        .main-nav > ul > li > a:hover, .main-nav > ul > li.active > a { color: var(--auth-blue) !important; border-bottom: 3px solid var(--eco-green); }
        .main-nav > ul > li > a:hover i, .main-nav > ul > li.active > a i { color: var(--eco-green) !important; }

        @media (min-width: 769px) {
            /* 汉堡菜单在 PC 端隐藏 */
            .mobile-menu-btn { display: none; }
            
            .main-nav .has-dropdown { position: relative; padding-bottom: 20px; margin-bottom: -20px; }
            .main-nav .has-dropdown > a i { font-size: 0.85rem; margin-left: 6px; transition: transform 0.3s ease; }
            .main-nav .has-dropdown > ul { position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(15px); background-color: var(--white); min-width: 240px; border-radius: 6px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); border-top: 3px solid var(--eco-green); opacity: 0; visibility: hidden; transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); z-index: 1001; padding: 10px 0; list-style: none; flex-direction: column; gap: 0; }
            .main-nav .has-dropdown:hover > ul { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
            .main-nav .has-dropdown:hover > a i { transform: rotate(180deg); }
            .main-nav .has-dropdown > ul > li { margin: 0; width: 100%; }
            .main-nav .has-dropdown > ul > li > a { padding: 12px 25px; font-size: 0.95rem; font-weight: 500; color: var(--text-main); border-bottom: none; display: block; transition: all 0.2s ease; }
            .main-nav .has-dropdown > ul > li > a:hover { color: var(--auth-blue) !important; background-color: #f8fafc; padding-left: 32px; border-bottom: none; }
        }

        .header-cta { display: flex; align-items: center; gap: 25px; }
        .header-phone { display: flex; align-items: center; gap: 10px; color: var(--auth-blue); }
        .header-phone i { font-size: 2rem; color: var(--warn-yellow); animation: phonePulse 2s infinite; }
        .phone-text { display: flex; flex-direction: column; line-height: 1.2; }
        .phone-text span { font-size: 0.75rem; color: var(--text-light); font-weight: 600; }
        .phone-text strong { font-size: 1.2rem; font-weight: 900; letter-spacing: 0.5px; }
        @keyframes phonePulse { 0% { transform: scale(1); } 50% { transform: scale(1.1); } 100% { transform: scale(1); } }