:root {
            --primary-color: #6366f1; /* 科技紫 */
            --secondary-color: #a855f7; /* 渐变补色 */
            --accent-color: #22d3ee; /* 亮蓝点缀 */
            --bg-dark: #0f172a; /* 深蓝背景 */
            --card-bg: rgba(30, 41, 59, 0.7);
            --text-main: #f8fafc;
            --text-dim: #94a3b8;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }

        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 背景装饰 */
        .bg-glow {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
            z-index: -1;
            pointer-events: none;
        }

        /* 导航 */
        nav {
            padding: 1.5rem 10%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: rgba(15, 23, 42, 0.8);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            text-decoration: none;
            background: linear-gradient(to right, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .logo i {
            -webkit-text-fill-color: initial;
            background: none;
            color: var(--primary-color);
        }

        .nav-links a {
            color: var(--text-main);
            text-decoration: none;
            margin-left: 2rem;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

        /*.nav-links a:hover {
            color: var(--primary-color);
        }*/

        /* 第一部分：英雄部分 */
        .hero {
            padding: 8rem 10% 6rem;
            text-align: center;
            position: relative;
        }

        .hero h1 {
            font-size: 4rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            background: linear-gradient(to bottom, #fff, #94a3b8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero .subtitle {
            font-size: 1.5rem;
            color: var(--accent-color);
            font-weight: 500;
            margin-bottom: 1rem;
        }

        .hero .aux-text {
            color: var(--text-dim);
            max-width: 600px;
            margin: 0 auto 3rem;
        }

        .cta-group {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
        }

        .btn {
            padding: 1rem 2.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(99, 102, 241, 0.5);
        }

        .btn-secondary {
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.2);
            color: white;
        }

        .btn-secondary:hover {
            background: rgba(255,255,255,0.1);
        }

        /* 第二部分：核心价值 */
        .section-header {
            text-align: center;
            margin-bottom: 4rem;
            padding: 0 10%;
        }

        .section-header h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .section-header p {
            color: var(--text-dim);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            padding: 0 10% 6rem;
        }

        .feature-card {
            background: var(--card-bg);
            padding: 2.5rem;
            border-radius: 20px;
            border: 1px solid rgba(255,255,255,0.05);
            transition: transform 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-10px);
            border-color: var(--primary-color);
        }

        .feature-card i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }

        .feature-card h3 {
            margin-bottom: 1rem;
            font-size: 1.3rem;
        }

        .feature-card p {
            color: var(--text-dim);
            font-size: 0.95rem;
        }

        /* 第三部分：定价 */
        .pricing-section {
            background: rgba(0,0,0,0.2);
            padding-top: 1rem;    /* 顶部内边距 */
            padding-right: 10%;   /* 右侧内边距 */
            padding-bottom: 6rem; /* 底部内边距 */
            padding-left: 10%;    /* 左侧内边距 */
            margin-top: 0;        /* 上边距为0 */
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .pricing-card {
            background: var(--card-bg);
            padding: 3rem 2rem;
            border-radius: 24px;
            border: 1px solid rgba(255,255,255,0.05);
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .pricing-card.popular {
            border: 2px solid var(--primary-color);
            transform: scale(1.05);
            z-index: 2;
        }

        .badge {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: var(--primary-color);
            padding: 0.2rem 1rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
        }

        .price {
            font-size: 2.5rem;
            font-weight: 800;
            margin: 1.5rem 0;
        }

        .price span {
            font-size: 1rem;
            color: var(--text-dim);
            font-weight: 400;
        }

        .price .original {
            text-decoration: line-through;
            font-size: 1rem;
            display: block;
            margin-bottom: -0.5rem;
        }

        .perks {
            list-style: none;
            margin-bottom: 2rem;
            flex-grow: 1;
        }

        .perks li {
            margin-bottom: 0.8rem;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .perks li i {
            color: #10b981;
        }

        /* 第四部分：功能详解 */
        .details-section {
            padding: 6rem 10%;
        }

        .detail-item {
            display: flex;
            align-items: center;
            gap: 4rem;
            margin-bottom: 2rem;
        }

        .detail-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .detail-content {
            flex: 1;
        }

        .detail-image {
            /* flex: 1; */
            background: linear-gradient(45deg, #1e293b, #334155);
            width: 200px;
            height: 200px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
            border: 1px solid rgba(255,255,255,0.1);
        }

        .detail-content h3 {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--accent-color);
        }

        /* 第五部分：应用场景 */
        .use-case-section {
            padding: 6rem 10%;
            background: linear-gradient(to bottom, transparent, rgba(99, 102, 241, 0.05));
        }

        .use-case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
        }

        .use-case-card {
            background: rgba(255,255,255,0.02);
            padding: 2rem;
            border-radius: 15px;
            border-left: 4px solid var(--primary-color);
        }

        /* 页脚 */
        footer {
            padding: 4rem 10%;
            border-top: 1px solid rgba(255,255,255,0.1);
            background: #020617;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 4rem;
        }

        .footer-brand p {
            margin-top: 1rem;
            color: var(--text-dim);
        }

        .footer-links h4 {
            margin-bottom: 1.5rem;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.8rem;
        }

        .footer-links a {
            color: var(--text-dim);
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: white;
        }

        .qr-placeholder {
            width: 200px;
            height: 200px;
            background: white;
            padding: 10px;
            border-radius: 10px;
            margin-top: 1rem;
        }

        /* 移动端适配 */
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .hero .subtitle { font-size: 1.2rem; }
            .nav-links { display: none; }
            .detail-item { flex-direction: column !important; text-align: center; }
            .pricing-card.popular { transform: none; }
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* 视频演示 */
        .video-section {
            padding: 0 10% 6rem;
            text-align: center;
        }

        .video-container {
            position: relative;
            max-width: 1000px;
            margin: 0 auto;
            border-radius: 24px;
            background: #000;
            box-shadow: 0 30px 60px rgba(0,0,0,0.5);
            border: 1px solid rgba(255,255,255,0.1);
            aspect-ratio: 16 / 9;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .video-placeholder-ui i {
            font-size: 5rem;
            color: var(--primary-color);
            transition: 0.3s;
        }
        .video-container:hover .video-placeholder-ui i { transform: scale(1.1); color: var(--accent-color); }


        /* 用户评价 */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
        }

        .testimonial-card {
            background: var(--card-bg);
            padding: 2.2rem;
            border-radius: 24px;
            border: 1px solid rgba(255,255,255,0.05);
            display: flex;
            flex-direction: column;
        }

        .testimonial-text { font-size: 0.95rem; color: var(--text-main); margin-bottom: 1.5rem; line-height: 1.7; }
        .user-meta { display: flex; align-items: center; gap: 1rem; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 1.2rem; }
        .user-avatar { width: 45px; height: 45px; border-radius: 50%; background: var(--primary-color); display: flex; align-items: center; justify-content: center; font-weight: bold; }
        .user-info h4 { font-size: 0.95rem; color: #fff; }
        .user-info p { font-size: 0.8rem; color: var(--text-dim); }
        .stats-badge { display: inline-block; margin-top: 1rem; padding: 0.2rem 0.6rem; background: rgba(16, 185, 129, 0.1); color: #10b981; border-radius: 8px; font-size: 0.8rem; }




           /* 新增尾部内容 (参考图2) */
        .final-promo {
            background: linear-gradient(to right, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
            padding: 5rem 10%;
            text-align: center;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .promo-title { font-size: 2.2rem; margin-bottom: 2rem; color: #fff; }
        .promo-stats {
            display: flex;
            justify-content: center;
            gap: 4rem;
            flex-wrap: wrap;
        }
        .stat-item h3 { font-size: 2.5rem; color: var(--primary-color); margin-bottom: 0.5rem; }
        .stat-item p { color: var(--text-dim); }

        /* 按钮 */
        .btn {
            display: inline-block;
            padding: 1rem 2.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: 0.3s;
            cursor: pointer;
            border: none;
            text-align: center;
        }
        .btn-primary { background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: white; box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3); }
        .btn-outline { border: 1px solid rgba(255,255,255,0.2); color: white; }
        .btn:hover { opacity: 0.9; transform: translateY(-2px); }