@charset 'UTF-8';
* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, sans-serif;
        }
 
        body {
            background-color: var(--dark);
            color: var(--light);
            line-height: 1.6;
            overflow-x: hidden;
        }
 
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
 
        /* 头部样式 */
        header {
            padding: 20px 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            background: rgba(15, 23, 42, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(100, 116, 139, 0.3);
        }
 
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
 
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--accent);
        }
 
        .logo i {
            font-size: 2rem;
        }
 
        nav ul {
            display: flex;
            gap: 30px;
            list-style: none;
        }
        
        nav a.active{
             color: var(--accent);
        }
 
        nav a {
            color: var(--light);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
        }
 
        nav a:hover {
            color: var(--accent);
        }
        
      
 
        nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s;
        }
 
        nav a:hover::after {
            width: 100%;
        }
 
        .auth-buttons {
            display: flex;
            gap: 15px;
        }
 
        .btn {
            padding: 10px 20px;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-block;
            text-align: center;
        }
 
        .btn-outline {
            border: 2px solid var(--accent);
            color: var(--accent);
            background: transparent;
        }
 
        .btn-outline:hover {
            background: rgba(0, 198, 255, 0.1);
        }
 
        .btn-primary {
            background: linear-gradient(90deg, var(--primary), var(--accent));
            color: white;
            border: none;
        }
 
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 198, 255, 0.3);
        }
 
        /* 英雄区域 */
        .hero {
            padding: 180px 0 100px;
            background: radial-gradient(circle at top right, rgba(26, 115, 232, 0.1), transparent 40%),
                        radial-gradient(circle at bottom left, rgba(0, 198, 255, 0.1), transparent 40%),
                        var(--dark);
            position: relative;
            overflow: hidden;
        }
 
        .hero-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
 
        .hero-text {
            flex: 1;
        }
 
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
        }
 
        h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            margin-bottom: 20px;
            background: linear-gradient(90deg, #fff, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
 
        .subtitle {
            font-size: 1.5rem;
            color: var(--gray);
            margin-bottom: 30px;
        }
 
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
 
        .feature-card {
            background: rgba(30, 41, 59, 0.6);
            border: 1px solid rgba(100, 116, 139, 0.3);
            border-radius: 15px;
            padding: 25px;
            transition: transform 0.3s;
        }
 
        .feature-card:hover {
            transform: translateY(-10px);
            border-color: var(--accent);
        }
 
        .feature-icon {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 15px;
        }
 
        .feature-title {
            font-size: 1.3rem;
            margin-bottom: 10px;
        }
 
        /* 服务区域 */
        .services {
            padding: 100px 0;
            background: rgba(15, 23, 42, 0.8);
        }
 
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
 
        .section-title {
            font-size: 2.5rem;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
 
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent);
            border-radius: 2px;
        }
 
        .section-subtitle {
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto;
        }
 
        .service-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
 
        .service-card {
            background: rgba(30, 41, 59, 0.6);
            border-radius: 15px;
            padding: 30px;
            border: 1px solid rgba(100, 116, 139, 0.3);
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }
 
        .service-card:hover {
            transform: translateY(-10px);
            border-color: var(--accent);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
        }
 
        .service-card::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 198, 255, 0.1) 0%, transparent 70%);
            z-index: -1;
            opacity: 0;
            transition: opacity 0.5s;
        }
 
        .service-card:hover::before {
            opacity: 1;
        }
 
        .service-icon {
            font-size: 3rem;
            color: var(--accent);
            margin-bottom: 20px;
        }
 
        .service-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
 
        /* 统计区域 */
        .stats {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--secondary), var(--dark));
            position: relative;
        }
 
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
        }
 
        .stat-card {
            text-align: center;
            padding: 30px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 15px;
            backdrop-filter: blur(10px);
        }
 
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            background: linear-gradient(90deg, #fff, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 10px;
        }
 
        /* 页脚 */
        footer {
            padding: 60px 0 30px;
            background: rgba(10, 15, 30, 0.9);
        }
 
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }
 
        .footer-col h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
 
        .footer-col h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--accent);
        }
 
        .footer-links {
            list-style: none;
        }
 
        .footer-links li {
            margin-bottom: 12px;
        }
 
        .footer-links a {
            color: var(--gray);
            text-decoration: none;
            transition: color 0.3s;
        }
 
        .footer-links a:hover {
            color: var(--accent);
        }
 
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
 
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(100, 116, 139, 0.2);
            color: var(--light);
            transition: all 0.3s;
        }
 
        .social-links a:hover {
            background: var(--accent);
            transform: translateY(-5px);
        }
 
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(100, 116, 139, 0.2);
            color: var(--gray);
            font-size: 0.9rem;
        }
 
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-content {
                flex-direction: column;
            }
            
            .features-grid,
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
 
        @media (max-width: 768px) {
            nav ul {
                display: none;
            }
            
            .features-grid,
            .stats-grid {
                grid-template-columns: 1fr;
            }
            
            h1 {
                font-size: 2.5rem;
            }
            
            .subtitle {
                font-size: 1.2rem;
            }
        }