:root {
            --primary: #4f46e5;
            --primary-glow: rgba(79, 70, 229, 0.4);
            --text-dark: #0f172a;
            --text-light: #475569;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; }
        body { background: #fcfaff; color: var(--text-dark); overflow-x: hidden; }

        /* --- 动画库 --- */
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
        @keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
        @keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
        
        .ani-up { animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }
        .ani-float { animation: float 6s ease-in-out infinite; }

        /* --- 导航栏主体 --- */
        header { 
            background: rgba(255, 255, 255, 255); 
            backdrop-filter: blur(20px); 
            height: 90px; 
            position: sticky; top: 0; z-index: 1000; 
            border-bottom: 1px solid rgba(0,0,0,0.05); 
        }
        .nav-container { 
            max-width: 1600px; 
            margin: 0 auto; padding: 0 60px; height: 100%; 
            display: flex; align-items: center; justify-content: space-between; 
        }
        
        .logo-section { display: flex; align-items: center; flex-shrink: 0; }
        .logo-icon img { height: 44px; width: auto; display: block; }

        /* PC 菜单样式 */
        .nav-menu { display: flex; list-style: none; gap: 5px; align-items: center; }
        .nav-item { 
            position: relative; padding: 0 15px; height: 90px; 
            line-height: 90px; font-size: 16px; font-weight: 600; 
            color: #334155; cursor: pointer; transition: 0.3s;
            white-space: nowrap; 
        }
        .nav-item:hover { color: var(--primary); }
		
		.nav-item a {
    text-decoration: none !important; /* 强制去除下划线 */
    color: inherit;                 /* 继承父元素的颜色，或者设为你的默认色 */
    display: inline-block;          /* 增加点击区域 */
}
.nav-item.active a {
    color: #f59e0b !important;      /* 确保高亮时是你想要的黄色 */
    font-weight: 700;
}
.nav-item a:hover, .nav-item.active a {
    border-bottom: none !important; /* 如果之前的样式里有边框下划线，这里去掉 */
}
		
        .nav-item.active { color: var(--primary); }
        .nav-item.active::after {
            content: ""; position: absolute; bottom: 20px; left: 15px; right: 15px; height: 3px;
            background: var(--primary); border-radius: 2px;
        }

        /* PC 下拉菜单 */
        .dropdown { 
            position: absolute; top: 90px; left: 50%; transform: translateX(-50%) translateY(15px); 
            background: #f7f7f7; border-radius: 16px; box-shadow: 0 30px 60px rgba(0,0,0,0.15); 
            padding: 25px; min-width: 450px; border: 1px solid #f1f5f9; 
            opacity: 0; visibility: hidden; transition: 0.3s; line-height: normal; 
            display: grid; grid-template-columns: 1fr 1fr; gap: 0px;
        }
        .nav-item:hover .dropdown { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
        .dropdown a { display: block; padding: 5px 10px; color: var(--text-light); text-decoration: none; font-size: 15px; border-radius: 8px; }
        .dropdown a:hover { background: #f5f3ff; color: var(--primary); }
        .dropdown b { display: block; margin-bottom: 10px; font-size: 16px; color: var(--primary); border-left: 2px solid var(--primary); padding-left: 10px; }

        .menu-btn { display: none; background: none; border: none; cursor: pointer; color: var(--text-dark); padding: 8px; }
        .mobile-nav { display: none; pointer-events: none; }

        /* --- Hero 区域 --- */
        .hero { max-width: 1600px; margin: 0 auto; padding: 60px; display: flex; align-items: center; gap: 60px; min-height: 65vh; }
        .hero-text { flex: 1.2; }
        .hero-text h1 { font-size: 64px; font-weight: 900; line-height: 1.1; margin: 25px 0; }
        .feature-list { margin: 40px 0; display: flex; flex-direction: column; gap: 20px; }
        .feature-item { display: flex; align-items: center; gap: 15px; }
        .feature-icon { width: 12px; height: 12px; background: var(--primary); border-radius: 50%; box-shadow: 0 0 10px var(--primary-glow); flex-shrink: 0; }
        .feature-item p { font-size: 18px; color: var(--text-light); }

        /* --- 旋转圆圈可视化区域 --- */
        .hero-visual { flex: 1; position: relative; display: flex; justify-content: center; align-items: center; }
        .visual-container { position: relative; width: 100%; max-width: 500px; display: flex; justify-content: center; align-items: center; }
        
        .rotating-ring { 
            position: absolute; 
            width: 120%; height: 120%; 
            border: 2px dashed var(--primary-glow); 
            border-radius: 50%; 
            animation: rotate 20s linear infinite; 
            pointer-events: none; z-index: 1; 
        }

        .main-card { 
            background: white; padding: 40px; border-radius: 32px; 
            box-shadow: 0 40px 100px rgba(0,0,0,0.08); 
            width: 100%; position: relative; z-index: 10; border: 1px solid #f1f5f9; 
        }
        .data-tag { position: absolute; background: white; padding: 12px 20px; border-radius: 15px; box-shadow: 0 10px 25px rgba(0,0,0,0.05); font-weight: 700; font-size: 14px; z-index: 20; white-space: nowrap; }

        /* --- 响应式适配 --- */
        @media (max-width: 1540px) {
            .nav-container { padding: 0 30px; }
            .nav-item { padding: 0 10px; font-size: 15px; }
            .hero { padding: 40px; gap: 30px; }
            .hero-text h1 { font-size: 52px; }
        }

        @media (max-width: 1200px) {
            header { height: 70px; }
            .nav-container { padding: 0 20px; height: 70px; }
            .nav-menu, .nav-action { display: none !important; }
            .menu-btn { display: block !important; position: relative; z-index: 1100; }

            .hero { flex-direction: row; padding: 60px 40px; text-align: left; }
            .hero-text h1 { font-size: 42px; }
            .hero-visual { transform: scale(0.8); }

            .mobile-nav { 
                display: block !important; pointer-events: auto;
                position: fixed; top: 0; right: 0; width: 85%; height: 100vh; 
                background: white; z-index: 1050; padding: 20px 24px 50px;
                transform: translateX(100%); transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1); 
                box-shadow: -10px 0 30px rgba(0,0,0,0.1); overflow-y: auto;
            }
            .mobile-nav.active { transform: translateX(0); }
            
            .m-item-header { 
                display: flex; justify-content: space-between; align-items: center;
                padding: 16px 0; font-size: 17px; font-weight: 700; 
                border-bottom: 1px solid #f1f5f9; cursor: pointer; color: var(--text-dark);
            }
            .m-item-header a { text-decoration: none; color: inherit; display: block; width: 100%; }
            .m-submenu { display: none; background: #f8fafc; padding: 10px 15px; border-radius: 12px; margin-top: 5px; }
            .m-submenu a { display: block; padding: 12px 0; color: var(--text-light); text-decoration: none; font-size: 15px; border-bottom: 1px solid rgba(0,0,0,0.03); }
        }

        @media (max-width: 992px) {
            .hero { flex-direction: column; text-align: center; padding: 80px 20px; }
            .hero-text { width: 100%; }
            .feature-item { justify-content: center; }
            .hero-visual { width: 100%; margin-top: 80px; transform: scale(1); }
            .rotating-ring { width: 110%; height: 110%; }
        }

        @media (max-width: 600px) {
            .hero-text h1 { font-size: 32px; }
            .btn-group { display: flex; flex-direction: column; gap: 12px; padding: 0 10px; }
            .btn-outline { margin-left: 0; }
        }

        .btn-base { padding: 16px 35px; border-radius: 12px; font-weight: 700; text-decoration: none; transition: 0.3s; display: inline-block; cursor: pointer; border: none; text-align: center; }
        .btn-primary { background: var(--primary); color: white; }
        .btn-outline { border: 1px solid #ddd; color: var(--text-dark); margin-left: 15px; background: transparent; }