/* 全局CSS变量：统一颜色/间距，便于维护 */
        :root {
            --primary: #2563eb; /* 主色调-调整后更醒目 */
            --primary-dark: #1d4ed8; /* 主色调加深 */
            --secondary: #3b82f6; /* 辅助色 */
            --accent: #165dff; /* 强调色（立即下载按钮）-核心调整 */
            --accent-dark: #1d4ed8; /* 强调色加深 */
            --text-primary: #333; /* 主要文字 */
            --text-secondary: #666; /* 次要文字 */
            --text-light: #999; /* 浅色文字 */
            --text-white: #fff; /* 白色文字 */
            --bg-light: #f9fafb; /* 浅色背景 */
            --bg-white: #ffffff; /* 白色背景 */
            --bg-gray: #f1f5f9; /* 浅灰背景 */
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.15);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 50px;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
            --spacing-xl: 3rem;
            --transition: all 0.3s ease;
            --pc-width: 1200px; /* PC端核心宽度-定死1200px */
        }

        /* 重置默认样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Microsoft Yahei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-white);
            scroll-behavior: smooth; /* 全局平滑滚动 */
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        /* 通用容器样式-核心：PC端1200px固定，移动端100% */
        .container {
            width: 100%;
            max-width: var(--pc-width);
            margin: 0 auto;
            padding: 0 var(--spacing-sm);
        }
        @media (min-width: 1200px) {
            .container {
                width: var(--pc-width);
                padding: 0;
            }
        }

        /* 面包屑导航：SEO友好，提升爬虫抓取 */
        .breadcrumb {
            padding: var(--spacing-sm) 0;
            font-size: 0.9rem;
            color: var(--text-light);
            border-bottom: 1px solid #eee;
            margin-bottom: var(--spacing-sm);
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb span {
            margin: 0 var(--spacing-xs);
        }

        /* 头部样式 */
        header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-sm) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            width: 100%;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            max-width: var(--pc-width);
            margin: 0 auto;
            padding: 0 var(--spacing-sm);
        }
        @media (min-width: 1200px) {
            .header-inner {
                width: var(--pc-width);
                padding: 0;
            }
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
        }
        .logo i {
            font-size: 1.5rem;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: var(--spacing-xl);
        }

        nav a {
            color: var(--text-secondary);
            font-weight: 500;
            position: relative;
            padding: var(--spacing-xs) 0;
        }

        nav a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--primary);
            transition: var(--transition);
        }

        nav a:hover {
            color: var(--primary);
        }

        nav a:hover::after {
            width: 100%;
        }

        #menuToggle {
            display: none;
            flex-direction: column;
            cursor: pointer;
            background: none;
            border: none;
            outline: none;
            width: 30px;
            height: 30px;
            justify-content: center;
        }

        .bar {
            width: 25px;
            height: 3px;
            background-color: var(--text-secondary);
            margin: 3px 0;
            transition: var(--transition);
            border-radius: 3px;
        }

        /* 软件优势栏-新增：提升页面丰富度 */
        .advantage-bar {
            background-color: var(--bg-gray);
            padding: var(--spacing-md) 0;
            border-bottom: 1px solid #e2e8f0;
        }
        .advantage-list {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--spacing-lg);
        }
        .advantage-item {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex: 1;
            min-width: 200px;
            justify-content: center;
        }
        .advantage-item i {
            font-size: 1.8rem;
            color: var(--primary);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--bg-white);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-sm);
        }
        .advantage-item h4 {
            font-size: 1.1rem;
            color: var(--text-primary);
            margin-bottom: 0.2rem;
        }
        .advantage-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* 主视觉区 (Hero Section) - 优化视觉效果 */
        #hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: var(--text-white);
            padding: 7rem 0;
            text-align: center;
            position: relative;
            overflow: hidden;
            background-image: url('https://www.snipastex.cn/snipaste-hero.jpg'); /* 替换为Snipaste截图背景 */
            background-blend-mode: overlay;
            background-size: cover;
            background-position: center;
        }
        #hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,250,0.5);
            z-index: 1;
        }
        #hero .container {
            position: relative;
            z-index: 2;
        }

        #hero h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-md);
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            line-height: 1.2;
        }

        #hero p {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-xl);
            opacity: 0.95;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 立即下载主按钮-核心配色调整 */
        .cta-button {
            display: inline-block;
            background-color: var(--accent);
            color: var(--text-white);
            padding: 16px 40px;
            border-radius: var(--radius-lg);
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: var(--transition);
            box-shadow: 0 6px 20px rgba(22, 93, 255, 0.4);
            border: none;
            cursor: pointer;
            font-size: 1.1rem;
        }

        .cta-button:hover {
            background-color: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(22, 93, 255, 0.5);
        }

        /* 通用内容区样式 */
        section {
            padding: 6rem 0;
        }

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: var(--spacing-sm);
            color: var(--text-primary);
            position: relative;
            padding-bottom: var(--spacing-sm);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary);
            border-radius: 2px;
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: var(--spacing-xl);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }

        /* 功能亮点区 (Features Section) */
        #features {
            background-color: var(--bg-light);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--spacing-xl);
        }

        .feature-card {
            background-color: var(--bg-white);
            padding: var(--spacing-xl) var(--spacing-md);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: var(--transition);
            border-top: 4px solid var(--primary);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transform: translateX(-100%);
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        .feature-card:hover::before {
            transform: translateX(0);
        }

        .feature-icon {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-md);
            color: var(--primary);
            transition: var(--transition);
        }
        .feature-card:hover .feature-icon {
            color: var(--secondary);
            transform: scale(1.1);
        }

        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: var(--spacing-sm);
            color: var(--text-primary);
        }

        .feature-card p {
            color: var(--text-secondary);
            font-size: 1rem;
            line-height: 1.7;
        }

        /* 应用场景区 (Scenarios Section) */
        #scenarios {
            background-color: var(--bg-white);
        }

        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--spacing-xl);
        }

        .scenario-item {
            text-align: center;
            padding: var(--spacing-xl) var(--spacing-md);
            background-color: var(--bg-light);
            border-radius: var(--radius-md);
            transition: var(--transition);
        }
        .scenario-item:hover {
            background-color: #f0f4f8;
            transform: translateY(-5px);
            box-shadow: var(--shadow-sm);
        }

        .scenario-icon {
            font-size: 3rem;
            margin-bottom: var(--spacing-sm);
            color: var(--primary);
        }

        .scenario-item h3 {
            font-size: 1.3rem;
            margin-bottom: var(--spacing-xs);
        }

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

        /* 教程区 (Tutorial Section) */
        #tutorial {
            background-color: var(--bg-light);
        }

        .tutorial-steps {
            max-width: 800px;
            margin: 0 auto;
        }

        .step {
            display: flex;
            align-items: flex-start;
            margin-bottom: var(--spacing-xl);
            background-color: var(--bg-white);
            padding: var(--spacing-md);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .step:hover {
            box-shadow: var(--shadow-md);
        }

        .step-number {
            background-color: var(--primary);
            color: var(--text-white);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
            flex-shrink: 0;
            margin-right: var(--spacing-md);
        }

        .step-content {
            flex: 1;
        }
        .step-content h3 {
            font-size: 1.4rem;
            margin-bottom: var(--spacing-xs);
            color: var(--text-primary);
        }
        .step-content p {
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .step-img {
            margin-top: var(--spacing-sm);
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid #eee;
        }
        .step-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
            transition: var(--transition);
        }
        .step-img img:hover {
            transform: scale(1.02);
        }

        /* 版本信息区-新增：提升页面丰富度，补充软件核心信息 */
        #version-info {
            background-color: var(--bg-white);
            padding: 5rem 0;
        }
        .version-card {
            background-color: var(--bg-gray);
            border-radius: var(--radius-md);
            padding: var(--spacing-xl);
            box-shadow: var(--shadow-sm);
            max-width: 900px;
            margin: 0 auto;
        }
        .version-card h3 {
            font-size: 1.8rem;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xl);
            text-align: center;
        }
        .version-info-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--spacing-lg);
        }
        .version-info-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .version-info-item i {
            font-size: 2rem;
            color: var(--primary);
            background-color: var(--bg-white);
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-sm);
        }
        .version-info-item .label {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .version-info-item .value {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        /* FAQ区 (FAQ Section) */
        #faq {
            background-color: var(--bg-light);
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            margin-bottom: var(--spacing-sm);
            border: 1px solid #e2e8f0;
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            padding: var(--spacing-md);
            background-color: var(--bg-white);
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background-color: var(--primary);
            color: var(--text-white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            transition: var(--transition);
        }

        .faq-answer {
            padding: 0 var(--spacing-md);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            background-color: var(--bg-white);
        }

        .faq-answer.open {
            padding: var(--spacing-md);
            max-height: 500px;
            border-top: 1px solid #e2e8f0;
        }

        /* 用户评价区 (Testimonials Section) */
        #testimonials {
            background-color: var(--bg-white);
        }

        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--spacing-xl);
        }

        .testimonial-card {
            background-color: var(--bg-light);
            padding: var(--spacing-xl);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: var(--transition);
            position: relative;
        }
        .testimonial-card::before {
            content: '"';
            position: absolute;
            top: 10px;
            left: 20px;
            font-size: 4rem;
            color: var(--primary);
            opacity: 0.1;
            font-family: serif;
        }

        .testimonial-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }

        .testimonial-text {
            font-style: italic;
            color: var(--text-secondary);
            font-size: 1.1rem;
            margin-bottom: var(--spacing-md);
            line-height: 1.8;
        }

        .testimonial-author {
            font-weight: bold;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-xs);
        }
        .testimonial-author::before {
            content: '';
            width: 20px;
            height: 2px;
            background-color: var(--primary);
        }

        /* 下载区 (Download Section) */
        #download {
            background: linear-gradient(135deg, #f0f4f8 0%, #e8f0fe 100%);
            padding: 7rem 0;
        }

        .download-options {
            display: flex;
            justify-content: center;
            gap: var(--spacing-xl);
            flex-wrap: wrap;
            margin-top: var(--spacing-md);
            margin-bottom: var(--spacing-xl);
        }

        /* 下载按钮-配色同步调整 */
        .download-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: var(--accent);
            color: var(--text-white);
            padding: 18px 40px;
            border-radius: var(--radius-lg);
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(22, 93, 255, 0.3);
            gap: var(--spacing-xs);
            font-size: 1rem;
        }
        .download-btn i {
            font-size: 1.2rem;
        }

        .download-btn.quark {
            background-color: #34c759;
            box-shadow: 0 4px 15px rgba(52, 199, 89, 0.3);
        }
        .download-btn.quark:hover {
            background-color: #28a745;
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(52, 199, 89, 0.4);
        }

        .download-btn.bdp {
            background-color: #0071e3;
            box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3);
        }
        .download-btn.bdp:hover {
            background-color: #0066cc;
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(0, 113, 227, 0.4);
        }

        .download-btn:hover {
            background-color: var(--accent-dark);
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(22, 93, 255, 0.4);
        }

        /* 更新日志模块-新增：下载区补充，提升页面丰富度 */
        .update-log {
            max-width: 800px;
            margin: 0 auto;
            background-color: var(--bg-white);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-sm);
        }
        .update-log h4 {
            font-size: 1.3rem;
            color: var(--text-primary);
            margin-bottom: var(--spacing-md);
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .update-log h4 i {
            color: var(--primary);
        }
        .update-log-list {
            list-style: disc;
            padding-left: var(--spacing-lg);
        }
        .update-log-list li {
            color: var(--text-secondary);
            margin-bottom: var(--spacing-sm);
            line-height: 1.7;
        }
        .download-note {
            text-align: center;
            margin-top: var(--spacing-xl);
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* 底部悬浮广告 - 优化样式+添加关闭按钮 */
        .floating-ad {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background-color: var(--primary);
            color: var(--text-white);
            text-align: center;
            padding: 15px 0;
            z-index: 1001;
            font-weight: 500;
            box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
            display: flex;
            justify-content: center;
            align-items: center;
            gap: var(--spacing-md);
        }
        .close-ad {
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.2rem;
            cursor: pointer;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .close-ad:hover {
            background-color: rgba(255,255,255,0.2);
        }

        /* 返回顶部按钮 - 优化样式 */
        #backToTop {
            position: fixed;
            bottom: 80px;
            right: 20px;
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: var(--text-white);
            border: none;
            border-radius: 50%;
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: var(--shadow-md);
            z-index: 1002;
            display: none;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        #backToTop:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        /* 侧边栏菜单 */
        #sidebarMenu {
            position: fixed;
            top: 0;
            right: -300px;
            width: 300px;
            height: 100vh;
            background-color: var(--bg-white);
            box-shadow: -2px 0 10px rgba(0, 0, 0, 0.2);
            z-index: 1003;
            transition: right 0.3s ease;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            padding: 4rem 2rem 2rem;
        }

        #sidebarMenu.active {
            right: 0;
        }

        #sidebarMenu ul {
            list-style: none;
            width: 100%;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }

        #sidebarMenu li {
            width: 100%;
        }

        #sidebarMenu a {
            font-size: 1.2rem;
            color: var(--text-secondary);
            font-weight: 500;
            display: block;
            padding: var(--spacing-sm) 0;
            border-bottom: 1px solid #eee;
        }

        #sidebarMenu a:hover {
            color: var(--primary);
            padding-left: var(--spacing-xs);
        }

        /* 遮罩层 */
        #overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1002;
            backdrop-filter: blur(2px);
        }

        #overlay.active {
            display: block;
        }

        /* 页脚样式-优化：新增友链模块，丰富内容 */
        footer {
            background-color: #1e293b;
            color: var(--text-white);
            padding: var(--spacing-xl) 0;
            margin-top: var(--spacing-xl);
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--spacing-xl);
            margin-bottom: var(--spacing-xl);
        }
        .footer-col h3 {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-md);
            color: #e2e8f0;
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .footer-col h3 i {
            color: var(--primary);
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: var(--spacing-sm);
        }
        .footer-col a {
            color: #a0aec0;
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
        }
        .footer-col a i {
            color: var(--primary);
            width: 16px;
        }
        .footer-col a:hover {
            color: var(--primary);
            transform: translateX(3px);
        }
        /* 友情链接模块 */
        .friend-links {
            border-top: 1px solid #334155;
            padding-top: var(--spacing-xl);
            margin-top: var(--spacing-xl);
        }
        .friend-links h3 {
            font-size: 1.2rem;
            color: #e2e8f0;
            margin-bottom: var(--spacing-md);
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .friend-links h3 i {
            color: var(--primary);
        }
        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-md);
        }
        .friend-links-list a {
            color: #a0aec0;
            padding: 6px 12px;
            border: 1px solid #334155;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .friend-links-list a:hover {
            color: var(--primary);
            border-color: var(--primary);
        }
        .copyright-text {
            text-align: center;
            padding-top: var(--spacing-md);
            border-top: 1px solid #334155;
            color: #a0aec0;
            font-size: 0.9rem;
            line-height: 1.7;
            margin-top: var(--spacing-xl);
        }

        /* 响应式媒体查询 */
        @media (max-width: 1200px) {
            .advantage-list {
                gap: var(--spacing-md);
            }
        }
        @media (max-width: 768px) {
            .logo {
                font-size: 1.5rem;
            }
            nav ul {
                display: none;
            }
            #menuToggle {
                display: flex;
            }
            #hero h1 {
                font-size: 2.2rem;
            }
            #hero p {
                font-size: 1.1rem;
            }
            .cta-button {
                padding: 14px 30px;
                font-size: 1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .section-subtitle {
                font-size: 1rem;
            }
            section {
                padding: 4rem 0;
            }
            #version-info {
                padding: 3rem 0;
            }
            .version-card {
                padding: var(--spacing-md);
            }
            .version-card h3 {
                font-size: 1.5rem;
            }
            .download-options {
                flex-direction: column;
                align-items: center;
                gap: var(--spacing-md);
            }
            .download-btn {
                width: 90%;
                max-width: 320px;
                text-align: center;
                padding: 16px 0;
            }
            .feature-grid, .scenario-grid, .testimonial-grid {
                gap: var(--spacing-md);
            }
            .step {
                flex-direction: column;
            }
            .step-number {
                margin-bottom: var(--spacing-sm);
                align-self: flex-start;
            }
            .floating-ad {
                padding: 12px 0;
                font-size: 0.9rem;
            }
            .advantage-item {
                min-width: 100%;
                justify-content: flex-start;
            }
        }

        /* 加载动画 */
        .loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: var(--bg-white);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            transition: opacity 0.5s ease;
        }
        .loader.hidden {
            opacity: 0;
            pointer-events: none;
        }
        .loader-spinner {
            width: 50px;
            height: 50px;
            border: 5px solid var(--bg-light);
            border-top: 5px solid var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }