:root {
            --theme-color: #00BEBD; 
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-color: #f3f4f6;
            --border-color: #e5e7eb;
            --container-width: 1184px; 
            --secondary-color: #dc2626; /* 红色用于强调警示与效率 */
        }

        * { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
        body { color: var(--text-dark); line-height: 1.6; background-color: #ffffff; overflow-x: hidden; }
        a { text-decoration: none; color: inherit; }

        .container { width: 100%; max-width: var(--container-width); margin: 0 auto; padding: 0 15px; }

        /* 顶部导航 Header */
        .header {
            background-color: #ffffff;
            border-bottom: 1px solid #e5e7eb;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-wrap {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            padding: 10px 20px;
        }

        .logo {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }

        .logo span {
            color: var(--secondary-color);
            margin-left: 5px;
        }

.nav-wrapper { display: flex; justify-content: space-between; align-items: center; padding: 10px 20px; }
#nav-menu ul { display: flex; list-style: none; }
#nav-menu ul li a { padding: 0 15px; text-decoration: none; color: #333; }
.menu-toggle { display: none; font-size: 24px; cursor: pointer; }

        .contact-btn {
            background-color: var(--secondary-color);
            color: white;
            padding: 10px 24px;
            border-radius: 4px;
            font-weight: bold;
            font-size: 18px;
        }

        /* Banner */
        .inner-banner { background: #1f2937; color: white; padding: 60px 0; text-align: center; }
        .inner-banner h1 { font-size: 36px; margin-bottom: 10px; }

        /* 关于我们内容区域 */
        .about-content { padding: 60px 0; }
        .about-section { margin-bottom: 60px; }
        .section-title { font-size: 28px; margin-bottom: 25px; color: var(--text-dark); border-left: 4px solid var(--theme-color); padding-left: 15px; }
        
        .grid-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
        .intro-text p { margin-bottom: 15px; color: var(--text-light); }
        .intro-img { background: #e5e7eb; height: 300px; display: flex; align-items: center; justify-content: center; color: #9ca3af; border-radius: 8px; }

        /* 优势卡片 */
        .advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        .adv-card { background: var(--bg-color); padding: 30px 20px; text-align: center; border-radius: 6px; }
        .adv-card h3 { color: var(--theme-color); margin-bottom: 10px; }
        .adv-card p { font-size: 14px; color: var(--text-light); }

        /* 页脚 */

        /* 页脚 Footer */
        .footer {
            background-color: var(--text-dark);
            color: #9ca3af;
            padding: 60px 0 20px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-title {
            color: white;
            font-size: 18px;
            margin-bottom: 20px;
        }

        .footer-info p {
            margin-bottom: 10px;
        }

        .copyright {
            text-align: center;
            border-top: 1px solid #374151;
            padding-top: 20px;
            font-size: 14px;
        }

        @media (max-width: 768px) {
            .grid-intro { grid-template-columns: 1fr; }
            .advantage-grid { grid-template-columns: 1fr; }
            
        .contact-btn {display:none;}

    .menu-toggle { display: block; }
    #nav-menu { display: none; position: absolute; top: 60px; left: 0; width: 100%; background: #fff; border-bottom: 2px solid #00BEBD; }
    #nav-menu.active { display: block; }
    #nav-menu ul { flex-direction: column; padding: 0; }
    #nav-menu ul li { border-bottom: 1px solid #eee; padding: 15px; text-align: center; }
        
    
            
            
        }
        
        
.side-float-nav { position: fixed; right: 10px; bottom: 20%; z-index: 999; }
.float-item { display: block; width: 50px; height: 50px; background: #00BEBD; color: #fff; text-align: center; line-height: 50px; margin-bottom: 10px; border-radius: 50%; text-decoration: none; font-size: 12px; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }