/* ============================================
           设计系统 - CSS 变量定义
           这里定义了整个网站的颜色、字体、间距等基础规范
           ============================================ */
        :root {
            /* 颜色系统 - Obsidian & Violet 配色方案 */
            --bg-primary: #060608;           /* 主背景色 - 近乎纯黑的黑曜石色 */
            --bg-secondary: #131316;         /* 次背景色 - 用于卡片背景 */
            --bg-tertiary: #1a1a1f;          /* 第三层背景 - 用于悬浮元素 */
            --text-primary: #E7E3E2;         /* 主文字色 - 暖灰白，避免纯白刺眼 */
            --text-secondary: #999494;       /* 次文字色 - 中性偏暖的灰色 */
            --text-muted: #737373;           /* 弱化文字色 - 中性灰色 */
            --accent-primary: rgba(255, 255, 255, 0.9);    /* 主强调色 - 白色高透明度 */
            --accent-secondary: rgba(255, 255, 255, 0.6);  /* 次强调色 - 白色中透明度 */
            --accent-glow: #A35B4A;          /* 高光色 - 暖色点缀 */
            --border-subtle: rgba(255, 255, 255, 0.08);  /* 细微边框 */
            --border-hover: rgba(255, 255, 255, 0.15);   /* 悬停边框 */
            
            /* 字体系统 */
            --font-display: 'Plus Jakarta Sans', sans-serif;  /* 展示字体 - 用于标题 */
            --font-body: 'Inter', sans-serif;                  /* 正文字体 */
            
            /* 间距系统 - 基于 8px 网格 */
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-4xl: 96px;
            --space-5xl: 128px;
            
            /* 圆角系统 */
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 32px;
            --radius-2xl: 24px;
            --radius-full: 9999px;  /* 胶囊形状 */
            
            /* 过渡动画 */
            --transition-fast: 150ms ease;
            --transition-base: 250ms ease;
            --transition-slow: 400ms ease;
        }

        /* ============================================
           基础重置样式
           清除浏览器默认样式，确保一致性
           ============================================ */
        *, *::before, *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;  /* 平滑滚动 */
        }
a{ color:#666; text-decoration: none;}
        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            background-image: 
                radial-gradient(circle at 20% 30%, rgba(106, 175, 255, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(202, 191, 255, 0.03) 0%, transparent 40%);
            background-attachment: fixed;
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* 氛围装饰背景 */
        .ambient-glow {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
            overflow: hidden;
        }

        .glow-1 {
            position: absolute;
            top: -10%;
            left: -10%;
            width: 40%;
            height: 40%;
            background: radial-gradient(circle, rgba(106, 175, 255, 0.08) 0%, transparent 70%);
            filter: blur(100px);
            animation: float 20s infinite alternate ease-in-out;
        }

        .glow-2 {
            position: absolute;
            bottom: 10%;
            right: -5%;
            width: 50%;
            height: 50%;
            background: radial-gradient(circle, rgba(202, 191, 255, 0.05) 0%, transparent 70%);
            filter: blur(120px);
            animation: float 25s infinite alternate-reverse ease-in-out;
        }

        @keyframes float {
            0% { transform: translate(0, 0) scale(1); }
            100% { transform: translate(10%, 10%) scale(1.1); }
        }

        /* ============================================
           工具类 - 通用样式
           ============================================ */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }

        .section {
            padding: var(--space-5xl) 0;
            position: relative;
        }

        /* 渐变文字效果 - 用于大标题 */
        .gradient-text, .section-title {
            background: linear-gradient(90deg, #cabfff, #fff 50%, #bfeaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block; /* 确保背景切片在 block 元素上正常工作 */
        }

        /* ============================================
           按钮组件
           两种样式：主按钮（实心）和次按钮（描边）
           ============================================ */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: var(--space-md) var(--space-xl);
            font-family: var(--font-body);
            font-size: 15px;
            font-weight: 500;
            text-decoration: none;
            border-radius: 999px;
            cursor: pointer;
            transition: all var(--transition-base);
            border: none;
            outline: none;
        }

        /* 主按钮 - 白色高透明度 */
        .btn-primary {
            background: rgba(255, 255, 255, 0.9);
            color: var(--bg-primary);
            box-shadow: 0 4px 20px rgba(255, 255, 255, 0.2);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            background: rgba(255, 255, 255, 1);
            box-shadow: 0 8px 30px rgba(255, 255, 255, 0.3);
        }

        /* 次按钮 - 透明背景带边框 */
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-subtle);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--border-hover);
        }

        /* ============================================
           区块标题组件
           统一的标题样式，用于各个模块
           ============================================ */
        .section-header {
            text-align: center;
            margin-bottom: var(--space-4xl);
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: var(--space-sm) var(--space-md);
            /* 改为渐变背景：从当前颜色到亮度+10的颜色 */
            background: linear-gradient(135deg, rgba(106, 175, 255, 0.08) 0%, rgba(157, 206, 255, 0.18) 100%);
            border: 1px solid rgba(106, 175, 255, 0.3);
            border-radius: var(--radius-full);
            font-family: var(--font-display);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: #6aafff;
            margin-bottom: var(--space-md);
        }

        .section-label::before {
            content: '';
            width: 6px;
            height: 6px;
            background: #6aafff;
            border-radius: 50%;
            animation: pulse 2s infinite;
        }

        .section-title {
            font-family: var(--font-display);
            font-size: 42px;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: var(--space-lg);
            /* 继承 .gradient-text 的渐变效果 */
        }

        .section-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        /* ============================================
           1. Header 悬浮导航区块
           采用胶囊形状的悬浮导航栏，带毛玻璃效果
           ============================================ */
        .header {
            position: fixed;
            top: 24px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1000;
            width: calc(100% - 48px);
            max-width: 900px;
        }

        .nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-sm) var(--space-lg);
            background: rgba(6, 6, 8, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-full);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-family: var(--font-display);
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            text-decoration: none;
        }

        .nav-logo-icon {
            width: 32px;
            height: 32px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 999px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-xl);
            list-style: none;
        }

        .nav-links a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        .nav-cta {
            padding: var(--space-sm) var(--space-lg);
            font-size: 14px;
        }

        /* ============================================
           2. Hero 首屏区块
           包含标题、文案、下载按钮和产品截图
           ============================================ */
        .hero {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding-top: 120px;
            padding-bottom: var(--space-4xl);
            position: relative;
            overflow: hidden;
        }

        /* 背景光效装饰 */
        .hero::before {
            content: '';
            position: absolute;
            top: 20%;
            left: 50%;
            transform: translateX(-50%);
            width: 1000px;
            height: 800px;
            background: radial-gradient(circle, rgba(106, 175, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
            filter: blur(60px);
        }

        .hero-content {
            text-align: center;
            max-width: 800px;
            width: 100%;
            margin: 0 auto;
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: var(--space-sm) var(--space-md);
            /* 改为渐变背景：从当前颜色到亮度+10的颜色 */
            background: linear-gradient(135deg, rgba(106, 175, 255, 0.08) 0%, rgba(157, 206, 255, 0.18) 100%);
            border: 1px solid rgba(106, 175, 255, 0.3);
            border-radius: var(--radius-full);
            font-size: 13px;
            font-weight: 500;
            color: #6aafff;
            margin-bottom: var(--space-xl);
        }

        .hero-badge-dot {
            width: 6px;
            height: 6px;
            background: #6aafff;
            border-radius: 50%;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        .hero-title {
            font-family: var(--font-display);
            font-size: 64px;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -0.03em;
            margin-bottom: var(--space-lg);
            text-align: center;
        }

        .hero-description {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto var(--space-2xl);
            line-height: 1.7;
        }

        .hero-cta {
            display: flex;
            gap: var(--space-md);
            justify-content: center;
            margin-bottom: var(--space-4xl);
        }

        /* 产品截图展示区 */
        .hero-screenshot {
            position: relative;
            width: 100%;
            max-width: 1000px;
            margin: 0 auto;
            z-index: 1;
            padding: 2px; /* 为发光效果预留微小间隙 */
        }

        /* 创建 AI 彩色氛围感背板 (发光边框效果) */
        .hero-screenshot::before {
            content: '';
            position: absolute;
            top: -6px;
            left: -6px;
            right: -6px;
            bottom: -6px;
            /* AI 风格渐变色 */
            background: linear-gradient(45deg, #6aafff, #cabfff, #ffbfe0, #bfeaff, #6aafff);
            background-size: 400% 400%;
            z-index: -1;
            /* 进一步增强模糊和亮度 */
            filter: blur(60px);
            border-radius: calc(var(--radius-xl) + 12px);
            opacity: 0.5;
            /* 呼吸流动的颜色动画 */
            animation: ai-glow-flow 8s linear infinite;
        }

        @keyframes ai-glow-flow {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        .screenshot-frame {
            position: relative;
            background: rgba(6, 6, 8, 0.5); /* 稍微加深背景以对比发光 */
            border-radius: var(--radius-xl);
            /* 精致的物理边框 */
            border: 1px solid rgba(255, 255, 255, 0.12);
            overflow: hidden;
            box-shadow: 0 25px 80px rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }


        /* ============================================
           3. 核心功能特性区块 - 现代杂志风格 (Modern Editorial)
           特点：打破边框、叠压布局、大字体装饰、杂色质感
           ============================================ */
        .features {
            background-color: #050505;
            position: relative;
            overflow: visible; /* 允许元素飞出容器 */
            padding: var(--space-5xl) 0;
        }

        /* 杂色质感底纹 */
        .features::before {
            content: '';
            position: absolute;
            inset: 0;
            opacity: 0.03;
            pointer-events: none;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
            z-index: 1;
        }

        .features-container {
            display: flex;
            flex-direction: column;
            gap: 200px; /* 拉大间距，制造杂志排版的开阔感 */
            position: relative;
            z-index: 2;
        }

        .feature-block {
            display: flex;
            align-items: center;
            position: relative;
            min-height: 600px;
        }

        /* 杂志风格的交替布局：通过左右对齐差异化 */
        .feature-block:nth-child(odd) { justify-content: flex-start; }
        .feature-block:nth-child(even) { justify-content: flex-end; }

        /* 背景大数字装饰 */
        .feature-bg-number {
            position: absolute;
            font-family: var(--font-display);
            font-size: 400px;
            font-weight: 900;
            line-height: 1;
            color: rgba(255, 255, 255, 0.03);
            pointer-events: none;
            z-index: -1;
            user-select: none;
        }
        .feature-block:nth-child(odd) .feature-bg-number { right: -50px; top: -100px; }
        .feature-block:nth-child(even) .feature-bg-number { left: -50px; bottom: -100px; }

        /* 视觉容器：打破常规，增加旋转和偏移 */
        .feature-visual-magazine {
            position: relative;
            width: 65%;
            height: 480px;
            background: #ffffff; /* 纯白色背景 */
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 24px;
            box-shadow: 0 50px 100px rgba(0,0,0,0.8);
            transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
            overflow: visible !important; /* 必须为 visible 才能让子元素飞出 */
            z-index: 1;
        }

        /* “飞出”的 UI 组件 */
        .flying-component {
            position: absolute;
            background: rgba(20, 20, 20, 0.85);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(106, 175, 255, 0.3);
            border-radius: 12px;
            padding: 24px;
            box-shadow: 0 30px 60px rgba(0,0,0,0.5);
            z-index: 50; /* 提升层级，确保在背景之上 */
            transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        .feature-block:nth-child(1) .flying-component {
            bottom: -40px; right: -60px;
            width: 320px;
            transform: rotate(3deg);
        }

        .feature-block:nth-child(2) .flying-component {
            top: -40px; left: -60px;
            width: 280px;
            transform: rotate(-3deg);
            border-color: rgba(255, 255, 255, 0.2);
        }

        .feature-block:nth-child(3) .flying-component {
            bottom: 20px; left: -80px;
            width: 350px;
            transform: rotate(-2deg);
        }

        /* 文字内容：采用不对称的叠压排列 */
        .feature-content-magazine {
            position: absolute;
            width: 40%;
            z-index: 20;
            padding: 60px;
            background: rgba(5, 5, 5, 0.5);
            backdrop-filter: blur(10px);
            border-left: 2px solid #6aafff;
        }

        .feature-block:nth-child(odd) .feature-content-magazine {
            right: 0;
            transform: translateX(10%);
        }

        .feature-block:nth-child(even) .feature-content-magazine {
            left: 0;
            transform: translateX(-10%);
            border-left: none;
            border-right: 2px solid #6aafff;
            text-align: right;
        }

        .feature-title-magazine {
            font-family: var(--font-display);
            font-size: 42px;
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 24px;
            color: #fff;
        }

        .feature-desc-magazine {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .feature-block { flex-direction: column !important; min-height: auto; gap: 60px; }
            .feature-visual-magazine { width: 100%; height: 350px; }
            .feature-content-magazine { 
                position: relative; width: 100%; transform: none !important; 
                padding: 30px 0; background: none; backdrop-filter: none;
                border: none !important; text-align: left !important;
            }
            .flying-component { display: none; } /* 移动端简化 */
            .feature-bg-number { font-size: 200px; }
        }

        /* ============================================
           4. 为什么选择 Molili 区块
           展示四个核心利益点
           ============================================ */
        .why-section {
            background: var(--bg-secondary);
            position: relative;
        }

        .why-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .benefits-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-xl);
        }

        .benefit-card {
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            overflow: hidden;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .benefit-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            z-index: 2;
        }

        .benefit-card:hover {
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-8px) scale(1.02);
            box-shadow:
                0 30px 60px rgba(0, 0, 0, 0.5),
                0 0 40px rgba(255, 255, 255, 0.05);
        }

        .benefit-image-wrapper {
            position: relative;
            width: 100%;
            height: 200px;
            overflow: hidden;
            background: #ffffff;
            flex-shrink: 0;
        }

        .benefit-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .benefit-card:hover .benefit-image {
            transform: scale(1.1);
        }

        .benefit-image-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, var(--bg-primary) 0%, transparent 60%);
            pointer-events: none;
            z-index: 1;
        }

        .benefit-content {
            padding: var(--space-xl) var(--space-xl) var(--space-2xl); /* 重新设置 padding */
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            position: relative;
            z-index: 2;
        }

        .benefit-content h3 {
            font-family: var(--font-display);
            font-size: 22px; /* 稍微加大标题 */
            font-weight: 700;
            margin-bottom: var(--space-md);
            color: var(--text-primary);
            letter-spacing: -0.01em;
            line-height: 1.3;
        }

        .benefit-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        /* 修复动画初始状态：确保 fade-in 的元素即便没有 visible 类也保留占位，但完全透明 */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), 
                        transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
            will-change: opacity, transform;
        }

        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ============================================
           5. 立即下载区块
           MACOS 和 Windows 下载入口
           ============================================ */
        .download-section {
            background: var(--bg-primary);
            text-align: center;
        }

        .download-options {
            display: flex;
            gap: var(--space-lg);
            justify-content: center;
            flex-wrap: wrap;
        }

        .download-card {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            padding: var(--space-xl) var(--space-2xl);
            background: var(--bg-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            text-decoration: none;
            color: var(--text-primary);
            transition: all var(--transition-base);
            min-width: 280px;
        }

        .download-card:hover {
            border-color: var(--accent-primary);
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(100, 88, 161, 0.2);
        }

        .download-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, rgba(100, 88, 161, 0.2) 0%, rgba(123, 111, 184, 0.2) 100%);
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-secondary);
        }

        .download-info {
            text-align: left;
        }

        .download-info h3 {
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .download-info p {
            font-size: 13px;
            color: var(--text-secondary);
        }

        /* ============================================
           6. 教程帮助文档区块
           三张卡片展示不同文档入口
           ============================================ */
        .docs-section {
            background: var(--bg-secondary);
            position: relative;
        }

        .docs-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

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

        .doc-card {
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: var(--space-2xl);
            text-decoration: none;
            color: var(--text-primary);
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .doc-card::after {
            content: '';
            top: 0;
            right: 0;
            width: 100px;
            height: 100px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .doc-card:hover {
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-4px);
        }

        .doc-icon {
            width: 48px;
            height: 48px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: var(--space-lg);
            color: rgba(255, 255, 255, 0.7);
        }

        .doc-card h3 {
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 600;
            margin-bottom: var(--space-sm);
        }

        .doc-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: var(--space-lg);
        }

        .doc-link {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 14px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.7);
            transition: gap var(--transition-fast);
        }

        .doc-card:hover .doc-link {
            gap: var(--space-md);
        }

        /* ============================================
           7. Footer 页脚
           简洁的页脚信息
           ============================================ */
        .footer {
            background: var(--bg-primary);
            padding: var(--space-3xl) 0;
            border-top: 1px solid var(--border-subtle);
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--space-lg);
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .footer-brand-icon {
            width: 28px;
            height: 28px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .footer-links {
            display: flex;
            gap: var(--space-xl);
            list-style: none;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--text-primary);
        }

        .footer-copyright {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ============================================
           响应式设计 - 移动端适配
           ============================================ */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 40px;
            }
            
            .section-title {
                font-size: 32px;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .benefits-grid {
                grid-template-columns: 1fr;
            }
            
            .nav-links {
                display: none;  /* 移动端隐藏导航链接 */
            }
            
            .hero-cta {
                flex-direction: column;
                align-items: center;
            }
            
            .download-options {
                flex-direction: column;
                align-items: center;
                gap: var(--space-lg);
            }
            
            .footer-content {
                flex-direction: column;
                text-align: center;
                gap: var(--space-xl);
            }

            .footer-links {
                flex-direction: column;
                gap: var(--space-md);
                align-items: center;
            }

            .download-card {
                width: 100%;
                justify-content: center;
            }
        }