/* 基础样式与全局变量设定 */
        :root {
            --bg-color: #0a1628;
            --card-bg: rgba(255, 255, 255, 0.03);
            --border-color: rgba(255, 255, 255, 0.08);
            --text-primary: #f3f4f6;
            --text-secondary: #9ca3af;
            --accent-glow-1: rgba(59, 130, 246, 0.35);
            --accent-glow-2: rgba(249, 115, 22, 0.30);
            --uu-blue: #3b82f6;
            --neon-purple: #f97316;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-primary);
            overflow-x: hidden;
            position: relative;
            line-height: 1.6;
        }

        /* 弥散风背景光源 */
        .diffuse-glow {
            position: absolute;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            filter: blur(150px);
            z-index: -1;
            pointer-events: none;
            opacity: 0.8;
        }

        .glow-1 {
            background: var(--accent-glow-1);
            top: -200px;
            left: -100px;
        }

        .glow-2 {
            background: var(--accent-glow-2);
            top: 600px;
            right: -200px;
        }

        .glow-3 {
            background: var(--accent-glow-1);
            bottom: 500px;
            left: -200px;
        }

        /* 导航栏 */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 12, 19, 0.8);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 2rem;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .nav-menu {
            display: flex;
            gap: 2rem;
            align-items: center;
            list-style: none;
        }

        .nav-menu a {
            color: var(--text-primary);
            text-decoration: none;
            font-size: 0.95rem;
            transition: color 0.3s;
        }

        .nav-menu a:hover {
            color: var(--neon-blue);
        }

        .nav-menu .download-btn {
            background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
            padding: 0.6rem 1.5rem;
            border-radius: 50px;
            font-weight: 600;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .nav-menu .download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
            color: #fff;
        }

        /* Hero 区域：左右响应式分列布局 */
        .hero {
            max-width: 1200px;
            margin: 0 auto;
            padding: 5rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: calc(100vh - 80px);
            gap: 4rem;
        }

        .hero-content {
            flex: 1;
        }

        .badge {
            background: rgba(0, 242, 254, 0.1);
            color: var(--neon-blue);
            padding: 0.4rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 1.5rem;
            border: 1px solid rgba(0, 242, 254, 0.2);
        }

        .hero-content h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            font-weight: 800;
        }

        .hero-content h1 span {
            background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 2.5rem;
        }

        /* 纯CSS绘图区域 */
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .css-illustration {
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(127, 0, 255, 0.1) 0%, rgba(11, 12, 19, 0) 70%);
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .circle-orbit {
            position: absolute;
            border: 1px dashed rgba(255, 255, 255, 0.15);
            border-radius: 50%;
            animation: rotate 20s linear infinite;
        }

        .orbit-1 { width: 320px; height: 320px; }
        .orbit-2 { width: 220px; height: 220px; animation-direction: reverse; }

        .shield-center {
            width: 140px;
            height: 160px;
            background: linear-gradient(135deg, var(--neon-purple), rgba(11, 12, 19, 0.9));
            border: 2px solid var(--neon-blue);
            clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            box-shadow: 0 0 30px rgba(0, 242, 254, 0.3);
            z-index: 2;
        }

        .shield-center i {
            font-size: 3rem;
            color: var(--neon-blue);
            text-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
        }

        .glow-node {
            position: absolute;
            width: 12px;
            height: 12px;
            background: var(--neon-blue);
            border-radius: 50%;
            box-shadow: 0 0 15px var(--neon-blue);
        }

        .node-1 { top: 10%; left: 50%; }
        .node-2 { bottom: 20%; left: 10%; }
        .node-3 { bottom: 20%; right: 10%; }

        /* 多平台下载区域 */
        .download-platforms {
            margin-top: 2rem;
        }

        .platform-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
        }

        .dl-btn {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 1rem;
            border-radius: 12px;
            color: var(--text-primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 1rem;
            transition: all 0.3s;
        }

        .dl-btn:hover {
            border-color: var(--neon-blue);
            background: rgba(0, 242, 254, 0.05);
            transform: translateY(-3px);
        }

        .dl-btn i {
            font-size: 1.8rem;
            color: var(--neon-blue);
        }

        .dl-text span {
            display: block;
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        .dl-text strong {
            font-size: 1rem;
        }

        /* 关键数据展示 */
        .stats-section {
            max-width: 1200px;
            margin: 0 auto;
            padding: 4rem 2rem;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .stat-card {
            text-align: center;
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--neon-blue);
            margin-bottom: 0.5rem;
        }

        .stat-label {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }

        /* 软件特点 */
        .features {
            max-width: 1200px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 1rem;
        }

        .section-header h2 span {
            background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .section-header p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 2.5rem 2rem;
            border-radius: 20px;
            backdrop-filter: blur(10px);
            transition: all 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            border-color: var(--neon-purple);
            box-shadow: 0 10px 30px rgba(127, 0, 255, 0.15);
        }

        .feature-icon {
            width: 60px;
            height: 60px;
            background: rgba(127, 0, 255, 0.1);
            border-radius: 12px;
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        .feature-icon i {
            font-size: 1.8rem;
            color: var(--neon-purple);
        }

        .feature-card h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }

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

        /* 线路加速线路展示 */
        .nodes-section {
            max-width: 1200px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        .nodes-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        .node-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            border-radius: 16px;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .node-flag {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #23242e;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.2rem;
        }

        .node-info h4 {
            font-size: 1rem;
            font-weight: 600;
        }

        .node-info span {
            font-size: 0.8rem;
            color: var(--neon-blue);
        }

        /* 价格套餐 */
        .pricing {
            max-width: 1200px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            align-items: stretch;
        }

        .price-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 24px;
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .price-card.popular {
            border-color: var(--neon-blue);
            background: linear-gradient(180deg, rgba(0, 242, 254, 0.05) 0%, rgba(11, 12, 19, 0.8) 100%);
            transform: scale(1.05);
        }

        .popular-badge {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--neon-blue);
            color: #000;
            padding: 0.3rem 1.2rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 700;
        }

        .price-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

        .price-value {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-primary);
            margin: 1.5rem 0;
        }

        .price-value span {
            font-size: 1rem;
            color: var(--text-secondary);
        }

        .price-features {
            list-style: none;
            margin-bottom: 2.5rem;
            text-align: left;
        }

        .price-features li {
            margin-bottom: 0.8rem;
            font-size: 0.95rem;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .price-features li i {
            color: var(--neon-blue);
        }

        .price-card .buy-btn {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            padding: 0.8rem 2rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
        }

        .price-card.popular .buy-btn {
            background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
            border: none;
            color: #fff;
        }

        .price-card.popular .buy-btn:hover {
            box-shadow: 0 5px 20px rgba(0, 242, 254, 0.4);
        }

        /* 权威推荐 */
        .reviews-media {
            max-width: 1200px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        .media-flex {
            display: flex;
            justify-content: space-around;
            align-items: center;
            flex-wrap: wrap;
            gap: 3rem;
            opacity: 0.6;
        }

        .media-item {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* 用户反馈区域 */
        .feedback {
            max-width: 1200px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        .feedback-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .feedback-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 2rem;
            border-radius: 20px;
        }

        .feedback-user {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .avatar-placeholder {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
            display: flex;
            justify-content: center;
            align-items: center;
            font-weight: 700;
        }

        .user-meta h4 {
            font-size: 0.95rem;
        }

        .user-meta span {
            font-size: 0.8rem;
            color: var(--text-secondary);
        }

        .rating {
            color: #fbbf24;
            font-size: 0.8rem;
            margin-bottom: 1rem;
        }

        .feedback-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* 常见问答区域 */
        .faq {
            max-width: 800px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            margin-bottom: 1rem;
            overflow: hidden;
        }

        .faq-question {
            padding: 1.5rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-answer {
            padding: 0 1.5rem 1.5rem 1.5rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
            display: none;
        }

        /* SEO 推广文本区 (权威性去AI痕迹) */
        .seo-promotion-section {
            background: rgba(255, 255, 255, 0.01);
            border-top: 1px solid var(--border-color);
            padding: 5rem 2rem;
        }

        .seo-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .seo-container h3 {
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            color: var(--text-primary);
        }

        .seo-container p {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            font-size: 1rem;
            line-height: 1.8;
            text-align: justify;
        }

        /* 页脚区域 */
        footer {
            background: #06070b;
            border-top: 1px solid var(--border-color);
            padding: 4rem 2rem 2rem 2rem;
        }

        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-logo-area p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-top: 1rem;
        }

        .footer-links h5 {
            font-size: 1.1rem;
            margin-bottom: 1.2rem;
        }

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

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

        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: var(--neon-blue);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 2rem;
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1.5rem;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        .footer-bottom a {
            color: var(--text-secondary);
            text-decoration: none;
        }

        .footer-bottom a:hover {
            color: var(--neon-blue);
        }

        /* 动画效果 */
        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        /* 响应式媒体查询 */
        @media (max-width: 992px) {
            .hero {
                flex-direction: column;
                text-align: center;
                padding-top: 2rem;
            }
            .hero-image {
                margin-top: 2rem;
            }
            .feature-grid, .pricing-grid, .feedback-grid, .nodes-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-section {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .hero-content h1 {
                font-size: 2.5rem;
            }
            .feature-grid, .pricing-grid, .feedback-grid, .nodes-grid, .stats-section, .footer-grid {
                grid-template-columns: 1fr;
            }
        }