:root {
            --bg-dark: #030712;
            --bg-card: rgba(255, 255, 255, 0.03); 
            --border-glow: rgba(0, 240, 255, 0.15); 
            --primary-blue: #0066FF;
            --accent-cyan: #00F0FF; 
            --text-main: #FFFFFF; 
            --text-muted: #9CA3AF; 
            --text-neon: #88E4FF;
            --neon-shadow: 0 0 20px rgba(0, 240, 255, 0.25); 
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-main);
            overflow-x: hidden;
            line-height: 1.6;
        }

        /* 霓虹背景网格光晕效果 */
        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 1000px;
            background: 
                radial-gradient(circle at 80% 20%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 20% 60%, rgba(0, 240, 255, 0.1) 0%, transparent 50%);
            pointer-events: none;
            z-index: 0;
        }

        /* ==========================================================================
           导航栏样式 (Header)
           ========================================================================== */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 8%;
            background: rgba(3, 7, 18, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .logo {
            font-size: 28px;
            font-weight: 900;
            color: var(--primary-blue); /* Logo 文字修改为极具科技感的品牌蓝 */
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo span {
            color: var(--accent-cyan);
            text-shadow: var(--neon-shadow);
        }

        nav {
            display: flex;
            align-items: center;
        }

        nav a {
            margin: 0 20px;
            text-decoration: none;
            color: var(--text-muted);
            font-weight: 500;
            font-size: 15px;
            transition: all 0.3s ease;
            position: relative;
        }

        nav a:hover, nav a.active {
            color: var(--accent-cyan);
            text-shadow: var(--neon-shadow);
        }

        nav a::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all 0.3s ease;
            transform: translateX(-50%);
            box-shadow: var(--neon-shadow);
        }

        nav a:hover::after {
            width: 80%;
        }

        /* ==========================================================================
           首屏 Hero 区域
           ========================================================================== */
        .hero {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 100px 8% 80px 8%;
            gap: 60px;
            position: relative;
            z-index: 1;
            max-width: 1400px;
            margin: 0 auto;
        }

        .content {
            flex: 1;
            max-width: 620px;
        }

        h1 {
            font-size: 54px;
            font-weight: 800;
            color: var(--text-main);
            line-height: 1.25;
            margin-bottom: 24px;
            letter-spacing: -0.5px;
        }

        h1 span {
            background: linear-gradient(135deg, #0066FF 0%, #00F0FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .actions {
            margin-bottom: 40px;
        }

        /* 经典高科技品牌蓝按钮 */
        .btn-dl {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #0055DD 0%, #0066FF 100%);
            color: white;
            padding: 18px 40px;
            text-decoration: none;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 700;
            box-shadow: 0 8px 30px rgba(0, 102, 255, 0.4);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            border: 1px solid rgba(255, 255, 255, 0.1);
            cursor: pointer;
            gap: 12px;
        }

        .btn-dl:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 15px 35px rgba(0, 102, 255, 0.6), 0 0 20px rgba(0, 240, 255, 0.3);
            background: linear-gradient(135deg, #0066FF 0%, #0088FF 100%);
        }

        .btn-dl img {
            width: 24px;
            height: 24px;
            filter: brightness(0) invert(1); /* 保证图标自动适应暗色主题变为亮白色 */
        }

        /* ==========================================================================
           首屏下载区下方主色调立体统计长条 (Stat Strip)
           ========================================================================== */
        .stat-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            background: linear-gradient(135deg, rgba(0, 40, 150, 0.4) 0%, rgba(0, 15, 60, 0.6) 100%);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 16px;
            padding: 22px 15px;
            margin-top: 35px;
            box-shadow: inset 0 0 15px rgba(0, 240, 255, 0.1), 0 10px 30px rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(10px);
            position: relative;
            overflow: hidden;
        }

        .stat-strip::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 50%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.15), transparent);
            transform: skewX(-25deg);
            animation: light-sweep 6s infinite linear;
        }

        @keyframes light-sweep {
            0% { left: -100%; }
            50% { left: 150%; }
            100% { left: 150%; }
        }

        .stat-item {
            text-align: center;
            position: relative;
        }

        .stat-item:not(:last-child)::after {
            content: '';
            position: absolute;
            right: 0;
            top: 15%;
            height: 70%;
            width: 1px;
            background: linear-gradient(to bottom, transparent, rgba(0, 240, 255, 0.4), transparent);
        }

        .stat-number {
            font-size: 28px;
            font-weight: 800;
            color: var(--accent-cyan);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
            margin-bottom: 4px;
            font-family: 'Century Gothic', Arial, sans-serif;
        }

        .stat-label {
            font-size: 13px;
            color: #A3B8CC;
            font-weight: 500;
            letter-spacing: 1px;
        }

        /* Hero 右侧手机展示区（已去掉黑色框与硬阴影） */
        .mockup {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .mockup::after {
            content: '';
            position: absolute;
            width: 130%;
            height: 130%;
            background: radial-gradient(circle, rgba(0, 102, 255, 0.15) 0%, transparent 70%);
            z-index: -1;
        }

        .mockup-inner {
            height: 520px;
            background: transparent; /* 去除黑色背景 */
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.5s ease;
        }

        .mockup-inner:hover {
            transform: scale(1.03) rotate(-1deg);
        }

        .mockup-inner img {
            height: 100%;
            width: auto;
            object-fit: cover;
        }

        /* ==========================================================================
           核心功能展示区
           ========================================================================== */
        .features-wrapper {
            padding: 100px 8%;
            background-color: rgba(10, 15, 30, 0.7);
            border-top: 1px solid rgba(255, 255, 255, 0.03);
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
            position: relative;
        }

        .section-title {
            text-align: center;
            font-size: 40px;
            font-weight: 800;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .section-title span {
            color: var(--accent-cyan);
            text-shadow: var(--neon-shadow);
        }

        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 60px;
            font-size: 16px;
        }

        .features-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 60px;
            max-width: 1300px;
            margin: 0 auto;
        }

        .features-image-wrap {
            flex: 1;
            display: flex;
            justify-content: center;
            position: relative;
        }

        .features-image {
            max-width: 100%;
            width: 420px;
            filter: drop-shadow(0 15px 30px rgba(0, 102, 255, 0.2));
            transition: all 0.5s ease;
        }

        .features-image:hover {
            transform: scale(1.05);
        }

        .features-grid {
            flex: 1.2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            padding: 30px;
            border-radius: 16px;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.05) 0%, transparent 100%);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            border-color: rgba(0, 240, 255, 0.6);
            box-shadow: 0 10px 25px -5px rgba(0, 240, 255, 0.15);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-card .icon {
            font-size: 36px;
            margin-bottom: 20px;
            display: inline-block;
            filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.5));
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: #FFFFFF;
        }

        .feature-card p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.6;
        }

        /* ==========================================================================
           全新升级：10个真实用户头像无缝轮番滑动区
           ========================================================================== */
        .testimonials-section {
            padding: 100px 0; /* 满宽滚动 */
            background-color: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }

        /* 渐变遮罩，营造两端淡出效果 */
        .testimonials-section::before,
        .testimonials-section::after {
            content: '';
            position: absolute;
            top: 0;
            width: 15%;
            height: 100%;
            z-index: 2;
            pointer-events: none;
        }

        .testimonials-section::before {
            left: 0;
            background: linear-gradient(to right, var(--bg-dark) 0%, transparent 100%);
        }

        .testimonials-section::after {
            right: 0;
            background: linear-gradient(to left, var(--bg-dark) 0%, transparent 100%);
        }

        /* 双向跑马灯容器 */
        .marquee-container {
            display: flex;
            flex-direction: column;
            gap: 24px;
            width: 100%;
            padding: 10px 0;
        }

        .marquee-track {
            display: flex;
            width: max-content;
            gap: 24px;
            animation: scroll-left 40s linear infinite;
        }

        /* 滚动动画 */
        @keyframes scroll-left {
            0% { transform: translateX(0); }
            100% { transform: translateX(calc(-50% - 12px)); } /* 刚好滚动到复制部分 */
        }

        /* 悬停暂停滚动，便于用户阅读内容 */
        .marquee-track:hover {
            animation-play-state: paused;
        }

        .testimonial-card {
            width: 360px;
            background: linear-gradient(135deg, rgba(0, 102, 255, 0.12) 0%, rgba(0, 20, 60, 0.4) 100%);
            border: 1px solid rgba(0, 102, 255, 0.3);
            padding: 24px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .testimonial-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 10px 25px rgba(0, 240, 255, 0.2);
            transform: scale(1.02);
        }

        .testimonial-text {
            color: var(--text-main);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 20px;
            font-style: italic;
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 14px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 14px;
        }

        .user-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            border: 2px solid var(--accent-cyan);
            object-fit: cover;
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
            background-color: #222;
        }

        .user-details h4 {
            font-size: 15px;
            color: #FFFFFF;
            font-weight: 700;
            margin-bottom: 2px;
        }

        .user-details span {
            font-size: 12px;
            color: var(--text-neon);
        }

        /* 星星评分样式 */
        .stars {
            color: #FFD700;
            font-size: 12px;
            margin-bottom: 12px;
        }

        /* ==========================================================================
           全新增加：APP 截图展示（4屏高科技环幕展示）
           ========================================================================== */
        .app-showcase-section {
            padding: 100px 8%;
            background: linear-gradient(180deg, var(--bg-dark) 0%, #050a18 100%);
            border-top: 1px solid rgba(0, 240, 255, 0.1);
            position: relative;
            overflow: hidden;
        }

        .app-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr); /* 修改为4列展示 */
            gap: 24px;
            max-width: 1400px;
            margin: 0 auto;
        }

        .app-card {
            background: #000;
            border-radius: 24px;
            overflow: hidden;
            border: 2px solid rgba(0, 102, 255, 0.3);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.8);
            transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            position: relative;
            aspect-ratio: 9 / 18.5; /* 手机屏幕标准比例 */
        }

        /* 发光顶部受光效果 */
        .app-card::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 22px;
            border: 1px solid transparent;
            background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent) border-box;
            pointer-events: none;
        }

        .app-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        /* 电脑端滑过放大且周围发光 */
        .app-card:hover {
            transform: translateY(-12px) scale(1.05);
            border-color: var(--accent-cyan);
            box-shadow: 0 20px 40px rgba(0, 240, 255, 0.25);
        }

        .app-card:hover img {
            transform: scale(1.08);
        }

        /* 手机截图说明浮层 */
        .app-info {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.95) 0%, rgba(0, 0, 0, 0.4) 70%, transparent 100%);
            padding: 25px 15px 15px 15px;
            text-align: center;
            z-index: 2;
        }

        .app-info h4 {
            font-size: 16px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 4px;
        }

        .app-info p {
            font-size: 12px;
            color: var(--accent-cyan);
            text-shadow: 0 0 5px rgba(0, 240, 255, 0.5);
        }

        /* 图形兜底，避免用户本地没有 app1-app4.png 图片时空白 */
        .app-fallback {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            background: radial-gradient(circle at center, #08122c 0%, #02050e 100%);
            color: #fff;
            padding: 20px;
            text-align: center;
        }

        .app-fallback-icon {
            font-size: 32px;
            color: var(--accent-cyan);
            margin-bottom: 12px;
            filter: drop-shadow(0 0 8px rgba(0,240,255,0.6));
        }

        /* ==========================================================================
           常见问题 FAQ 区域
           ========================================================================== */
        .faq-section {
            padding: 100px 8%;
            background: var(--bg-dark);
            max-width: 1200px;
            margin: 0 auto;
        }

        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .faq-card {
            background: var(--bg-card);
            border: 1px solid rgba(255, 255, 255, 0.05);
            padding: 28px;
            border-radius: 16px;
            transition: all 0.3s ease;
        }

        .faq-card:hover {
            border-color: rgba(0, 102, 255, 0.3);
            background: rgba(255, 255, 255, 0.05);
            transform: translateY(-2px);
        }

        .faq-card strong {
            display: block;
            font-size: 17px;
            color: var(--accent-cyan);
            margin-bottom: 10px;
            font-weight: 700;
        }

        .faq-card p {
            color: var(--text-muted);
            font-size: 14.5px;
            line-height: 1.7;
        }

        /* ==========================================================================
           页脚 Footer 区域
           ========================================================================== */
        footer {
            padding: 80px 8% 40px 8%;
            background: #02050c;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 60px;
        }

        .footer-left h3 {
            font-size: 24px;
            color: var(--primary-blue); /* 底部 Logo 修改为科技蓝色 */
            margin-bottom: 16px;
        }

        .footer-left p {
            color: var(--text-muted);
            font-size: 14px;
            max-width: 320px;
        }

        .footer-links h4, .footer-right h4 {
            font-size: 16px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .footer-links-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links-list a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .footer-links-list a:hover {
            color: var(--accent-cyan);
        }

        .footer-right p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
        }

        /* 底部底栏线 */
        .footer-bottom {
            grid-column: 1 / -1;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 30px;
            text-align: center;
            color: rgba(255, 255, 255, 0.3);
            font-size: 12px;
        }

        /* ==========================================================================
           响应式排版 (Responsive Design)
           ========================================================================== */
        @media (max-width: 1024px) {
            .hero {
                flex-direction: column;
                text-align: center;
                padding: 60px 5%;
            }
            .content {
                max-width: 100%;
            }
            .stat-strip {
                max-width: 600px;
                margin: 40px auto 0 auto;
            }
            .features-content {
                flex-direction: column;
            }
            .features-grid {
                grid-template-columns: 1fr;
                width: 100%;
            }
            .app-grid {
                grid-template-columns: repeat(2, 1fr); /* 平板端2x2网格 */
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            footer {
                grid-template-columns: 1fr;
                gap: 40px;
            }
        }

        @media (max-width: 640px) {
            h1 {
                font-size: 36px;
            }
            .stat-strip {
                grid-template-columns: repeat(2, 1fr);
                gap: 15px;
            }
            .stat-item:nth-child(2)::after {
                display: none;
            }
            .app-grid {
                grid-template-columns: 1fr; /* 手机端单列展示 */
            }
            .testimonials-section::before,
            .testimonials-section::after {
                width: 5%; /* 手机端减少模糊侧边宽度 */
            }
        }

        /* ==========================================================================
           动效关键帧类
           ========================================================================== */
        @keyframes slideIn {
            from { transform: translateY(50px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }
        @keyframes fadeOut {
            from { opacity: 1; }
            to { opacity: 0; }
        }
        @keyframes pulse {
            0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 240, 255, 0.4); }
            70% { transform: scale(1.02); box-shadow: 0 0 0 15px rgba(0, 240, 255, 0); }
            100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 240, 255, 0); }
        }