:root {
            --primary: #0066ff;
            --primary-dark: #0052cc;
            --primary-light: #3385ff;
            --secondary: #00cc88;
            --secondary-dark: #00b377;
            --accent: #ff6b6b;
            --accent-light: #ff8585;
            --warning: #ffc107;
            --success: #28a745;
            --text-dark: #1a1a1a;
            --text-medium: #4d4d4d;
            --text-light: #808080;
            --bg-white: #ffffff;
            --bg-light: #f8f9fa;
            --bg-gray: #f0f2f5;
            --bg-dark: #1a1a1a;
            --border: #e0e0e0;
            --border-light: #f0f0f0;
            --shadow-xs: 0 1px 3px rgba(0,0,0,0.05);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
            --shadow-lg: 0 8px 30px rgba(0,0,0,0.15);
            --shadow-xl: 0 12px 40px rgba(0,0,0,0.18);
            --radius-xs: 4px;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 30px;
            --radius-full: 9999px;
            --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --gradient-primary: linear-gradient(135deg, var(--primary), var(--primary-dark));
            --gradient-secondary: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            --gradient-accent: linear-gradient(135deg, var(--accent), var(--accent-light));
            --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --gradient-dark: linear-gradient(135deg, #2c3e50 0%, #1a1a1a 100%);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'SF Pro Display', sans-serif;
            line-height: 1.6;
            color: var(--text-medium);
            background-color: var(--bg-white);
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        svg.icon {
            width: 1em;
            height: 1em;
            display: inline-block;
            vertical-align: -0.125em;
            flex-shrink: 0;
            stroke: currentColor;
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .container-wide {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 字号体系 - 层级更细分 */
        .display-1 {
            font-size: 4rem;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -0.02em;
            margin-bottom: 1.5rem;
        }

        .display-2 {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -0.02em;
            margin-bottom: 1.5rem;
        }

        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -0.02em;
            margin-bottom: 1.5rem;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
        }

        .subsection-title {
            font-size: 1.875rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 0.75rem;
        }

        .card-title {
            font-size: 1.5rem;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 0.5rem;
        }

        .card-title-lg {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 0.5rem;
        }

        .feature-title {
            font-size: 1.375rem;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 0.5rem;
        }

        .lead-text {
            font-size: 1.25rem;
            line-height: 1.7;
            color: var(--text-medium);
        }

        .body-text {
            font-size: 1.0625rem;
            line-height: 1.7;
        }

        .body-text-sm {
            font-size: 1rem;
            line-height: 1.7;
        }

        .small-text {
            font-size: 0.9375rem;
            line-height: 1.6;
            color: var(--text-light);
        }

        .tiny-text {
            font-size: 0.8125rem;
            line-height: 1.5;
            color: var(--text-light);
        }

        /* 文字对齐 */
        .text-center {
            text-align: center;
        }

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

        .text-right {
            text-align: right;
        }

        /* 文本配色 */
        .text-primary {
            color: var(--primary);
        }

        .text-secondary {
            color: var(--secondary);
        }

        .text-accent {
            color: var(--accent);
        }

        .text-white {
            color: white;
        }

        .text-dark {
            color: var(--text-dark);
        }

        .text-medium {
            color: var(--text-medium);
        }

        .text-light {
            color: var(--text-light);
        }

        /* 按钮样式体系 - 状态更完整 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            font-size: 1rem;
            font-weight: 600;
            text-decoration: none;
            border-radius: var(--radius-md);
            border: 2px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            white-space: nowrap;
            outline: none;
            user-select: none;
        }

        .btn-primary {
            background: var(--gradient-primary);
            color: white;
            border-color: var(--primary);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
        }

        .btn-primary:active {
            transform: translateY(-1px);
        }

        .btn-secondary {
            background: var(--gradient-secondary);
            color: white;
            border-color: var(--secondary);
        }

        .btn-secondary:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .btn-accent {
            background: var(--gradient-accent);
            color: white;
            border-color: var(--accent);
        }

        .btn-accent:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary);
            color: white;
        }

        .btn-outline-white {
            background: transparent;
            color: white;
            border-color: rgba(255, 255, 255, 0.3);
        }

        .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: white;
        }

        .btn-light {
            background: white;
            color: var(--primary);
            border-color: white;
        }

        .btn-light:hover {
            background: var(--bg-gray);
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 0.875rem;
        }

        .btn-lg {
            padding: 16px 32px;
            font-size: 1.125rem;
            border-radius: var(--radius-lg);
        }

        .btn-xl {
            padding: 20px 40px;
            font-size: 1.25rem;
            border-radius: var(--radius-lg);
        }

        .btn-full {
            width: 100%;
        }

        .btn-icon {
            width: 48px;
            height: 48px;
            padding: 0;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        /* 顶部导航样式 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            z-index: 1000;
            transition: var(--transition);
        }

        .navbar.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow-sm);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 0;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            transition: var(--transition);
        }

        .logo:hover {
            transform: translateY(-2px);
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--gradient-primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 20px;
            font-weight: bold;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-link {
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 600;
            font-size: 1rem;
            padding: 8px 0;
            position: relative;
            transition: var(--transition);
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--primary);
            border-radius: var(--radius-full);
            transition: var(--transition);
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .nav-cta {
            margin-left: 16px;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-md);
            background: var(--bg-gray);
            color: var(--text-dark);
            cursor: pointer;
            transition: var(--transition);
        }

        .mobile-menu-btn:hover {
            background: var(--border);
        }

        /* 首屏横幅 */
        .hero {
            padding: 180px 0 120px;
            background: var(--gradient-hero);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120" preserveAspectRatio="none"><path d="M1200 120L0 16.48 0 0 1200 0 1200 120z" fill="%23ffffff"/></svg>') bottom center no-repeat;
            background-size: 100% auto;
            opacity: 0.05;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
        }

        .hero-subtitle {
            font-size: 1.375rem;
            margin-bottom: 40px;
            opacity: 0.9;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            margin-bottom: 60px;
            flex-wrap: wrap;
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 60px;
            margin-top: 60px;
            flex-wrap: wrap;
        }

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

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 8px;
            background: linear-gradient(135deg, #fff, rgba(255,255,255,0.8));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .stat-label {
            font-size: 1rem;
            opacity: 0.8;
            font-weight: 500;
        }

        /* 功能介绍模块 */
        .features {
            padding: 120px 0;
            background: var(--bg-light);
        }

        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 60px;
        }

        .section-subtitle {
            font-size: 1.25rem;
            color: var(--text-light);
            margin-top: 16px;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .feature-card {
            background: white;
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid transparent;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

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

        .feature-icon {
            width: 70px;
            height: 70px;
            background: var(--gradient-primary);
            border-radius: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 28px;
            color: white;
            font-size: 28px;
            transition: var(--transition);
        }

        .feature-card:hover .feature-icon {
            transform: scale(1.1) rotate(5deg);
        }

        .feature-desc {
            margin-top: auto;
        }

        /* 核心亮点模块 */
        .advantages {
            padding: 120px 0;
            background: white;
        }

        .advantages-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 80px;
            align-items: center;
        }

        .advantage-list {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }

        .advantage-item {
            display: flex;
            gap: 20px;
        }

        .advantage-icon {
            width: 60px;
            height: 60px;
            background: var(--bg-light);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 24px;
            flex-shrink: 0;
        }

        .advantage-content h3 {
            margin-bottom: 8px;
        }

        .advantage-visual {
            position: relative;
        }

        .visual-main {
            background: var(--gradient-primary);
            border-radius: var(--radius-xl);
            padding: 40px;
            color: white;
            box-shadow: var(--shadow-xl);
            transform: perspective(1000px) rotateY(-5deg);
            transition: var(--transition);
        }

        .visual-main:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        /* 用户口碑模块 */
        .testimonials {
            padding: 120px 0;
            background: var(--bg-light);
        }

        .testimonials-slider {
            position: relative;
            overflow: hidden;
            margin-top: 60px;
            padding: 0 20px;
        }

        .testimonials-track {
            display: flex;
            gap: 32px;
            transition: transform 0.5s ease;
        }

        .testimonial-card {
            min-width: 380px;
            background: white;
            border-radius: var(--radius-xl);
            padding: 40px 32px;
            box-shadow: var(--shadow-md);
            flex: 1;
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }

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

        .testimonial-rating {
            color: #ffb400;
            margin-bottom: 20px;
            font-size: 20px;
        }

        .testimonial-content {
            margin-bottom: 28px;
            position: relative;
        }

        .testimonial-content::before {
            content: '"';
            position: absolute;
            top: -20px;
            left: -10px;
            font-size: 80px;
            color: var(--primary-light);
            opacity: 0.1;
            font-family: Georgia, serif;
            line-height: 1;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .author-avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--gradient-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 700;
            font-size: 20px;
            flex-shrink: 0;
        }

        .slider-controls {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-top: 40px;
        }

        .slider-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: white;
            border: 1px solid var(--border);
            color: var(--text-dark);
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }

        .slider-btn:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* 常见疑问模块 */
        .faq {
            padding: 120px 0;
            background: white;
        }

        .faq-container {
            max-width: 900px;
            margin: 0 auto;
        }

        .faq-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 24px;
            margin-top: 60px;
        }

        .faq-item {
            background: var(--bg-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }

        .faq-question {
            padding: 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .faq-question:hover {
            background: rgba(0, 0, 0, 0.02);
        }

        .faq-question h3 {
            margin: 0;
            flex: 1;
            padding-right: 0;
        }

        .faq-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .faq-jump {
            height: 32px;
            padding: 0 12px;
            border-radius: var(--radius-full);
            background: var(--secondary);
            color: white;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
            box-shadow: var(--shadow-xs);
            user-select: none;
        }

        .faq-question:not([data-url]) .faq-jump {
            display: none;
        }

        .faq-jump-text {
            font-size: 12px;
            font-weight: 800;
            letter-spacing: 0.5px;
        }

        .faq-jump-symbol {
            font-size: 14px;
            font-weight: 900;
            line-height: 1;
        }

        .faq-question:hover .faq-jump {
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
        }

        .faq-toggle {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-full);
            background: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-question:hover .faq-toggle {
            transform: rotate(90deg);
        }

        .faq-answer {
            padding: 0 28px;
            max-height: 0;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-answer.active {
            padding: 0 28px 28px;
            max-height: 1000px;
        }

        /* 下载模块 */
        .download {
            padding: 120px 0;
            background: var(--gradient-dark);
            color: white;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .download::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120" preserveAspectRatio="none"><path d="M1200 120L0 16.48 0 0 1200 0 1200 120z" fill="%23ffffff"/></svg>') top center no-repeat;
            background-size: 100% auto;
            opacity: 0.03;
            transform: rotate(180deg);
        }

        .download-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
        }

        .download-steps {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin: 60px 0;
            flex-wrap: wrap;
        }

        .step {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 16px;
            max-width: 200px;
        }

        .step-number {
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 700;
            border: 2px solid rgba(255, 255, 255, 0.2);
        }

        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 60px;
        }

        .download-card {
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .download-card:hover {
            transform: translateY(-8px);
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.3);
        }

        .platform-icon {
            font-size: 56px;
            margin-bottom: 24px;
            opacity: 0.9;
        }

        .download-info {
            margin-top: auto;
            width: 100%;
        }

        .download-meta {
            display: flex;
            justify-content: space-between;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.875rem;
            opacity: 0.7;
        }

        /* 底部页脚 */
        .footer {
            background: var(--bg-dark);
            color: #b3b3b3;
            padding: 80px 0 40px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 60px;
            margin-bottom: 60px;
        }

        .footer-col h3 {
            color: white;
            margin-bottom: 28px;
            font-size: 1.25rem;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
            text-decoration: none;
        }

        .footer-logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            color: white;
        }

        .footer-desc {
            margin-bottom: 32px;
            line-height: 1.7;
        }

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

        .footer-links li {
            margin-bottom: 16px;
        }

        .footer-links a {
            color: #b3b3b3;
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-links a:hover {
            color: white;
            padding-left: 8px;
        }

        .footer-links i {
            width: 20px;
            text-align: center;
        }

        .social-links {
            display: flex;
            gap: 20px;
            margin-top: 32px;
        }

        .social-link {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #b3b3b3;
            text-decoration: none;
            transition: var(--transition);
            font-size: 18px;
        }

        .social-link:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
        }

        .copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #333;
            font-size: 0.875rem;
        }

        .footer-legal {
            display: flex;
            justify-content: center;
            gap: 32px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .footer-legal a {
            color: #b3b3b3;
            text-decoration: none;
            transition: var(--transition);
        }

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

        /* 徽章与标签 */
        .badge {
            display: inline-block;
            padding: 6px 12px;
            font-size: 0.75rem;
            font-weight: 700;
            border-radius: var(--radius-full);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .badge-primary {
            background: rgba(0, 102, 255, 0.1);
            color: var(--primary);
        }

        .badge-secondary {
            background: rgba(0, 204, 136, 0.1);
            color: var(--secondary);
        }

        .badge-accent {
            background: rgba(255, 107, 107, 0.1);
            color: var(--accent);
        }

        .badge-white {
            background: rgba(255, 255, 255, 0.1);
            color: white;
        }

        /* 工具样式 */
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 32px; }
        .mt-5 { margin-top: 40px; }
        .mt-6 { margin-top: 48px; }
        
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 32px; }
        .mb-5 { margin-bottom: 40px; }
        .mb-6 { margin-bottom: 48px; }
        
        .mx-auto { margin-left: auto; margin-right: auto; }

        /* 动画与过渡 */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }

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

        .animate-fade-in {
            opacity: 0;
            animation: fadeIn 0.6s ease forwards;
        }

        .animate-float {
            animation: float 3s ease-in-out infinite;
        }

        .animate-pulse {
            animation: pulse 2s ease-in-out infinite;
        }

        .delay-100 { animation-delay: 0.1s; }
        .delay-200 { animation-delay: 0.2s; }
        .delay-300 { animation-delay: 0.3s; }
        .delay-400 { animation-delay: 0.4s; }
        .delay-500 { animation-delay: 0.5s; }

        /* 回到顶部按钮 */
        .scroll-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 56px;
            height: 56px;
            background: var(--gradient-primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            border: none;
            box-shadow: var(--shadow-md);
        }

        .scroll-top.active {
            opacity: 1;
            visibility: visible;
        }

        .scroll-top:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        /* 响应式适配 */
        @media (max-width: 1200px) {
            .hero-title {
                font-size: 3rem;
            }
            
            .section-title {
                font-size: 2.25rem;
            }
            
            .advantages-container {
                gap: 60px;
            }
        }

        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.75rem;
            }
            
            .section-title {
                font-size: 2rem;
            }
            
            .display-1 {
                font-size: 3rem;
            }
            
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 24px 20px;
                box-shadow: var(--shadow-lg);
                gap: 20px;
                border-top: 1px solid var(--border);
            }
            
            .nav-menu.active {
                display: flex;
            }
            
            .nav-cta {
                margin-left: 0;
                margin-top: 16px;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .advantages-container {
                grid-template-columns: 1fr;
                gap: 60px;
            }
            
            .hero-stats {
                gap: 40px;
            }
            
            .testimonial-card {
                min-width: 100%;
            }
            
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .hero {
                padding: 160px 0 100px;
            }
            
            .hero-title {
                font-size: 2.5rem;
            }
            
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .hero-buttons .btn {
                width: 100%;
                max-width: 300px;
            }
            
            .features,
            .advantages,
            .testimonials,
            .faq,
            .download {
                padding: 80px 0;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .download-steps {
                flex-direction: column;
                align-items: center;
                gap: 32px;
            }
            
            .step {
                max-width: 100%;
            }
            
            .footer-grid {
                gap: 40px;
            }
        }

        @media (max-width: 576px) {
            .container {
                padding: 0 16px;
            }
            
            .hero-title {
                font-size: 2.25rem;
            }
            
            .section-title {
                font-size: 1.875rem;
            }
            
            .btn-xl {
                padding: 18px 32px;
                font-size: 1.125rem;
            }
            
            .feature-card,
            .testimonial-card,
            .download-card {
                padding: 32px 24px;
            }
            
            .footer-legal {
                flex-direction: column;
                align-items: center;
                gap: 16px;
            }
            
            .scroll-top {
                bottom: 20px;
                right: 20px;
                width: 48px;
                height: 48px;
            }
        }

        /* 打印模式样式 */
        @media print {
            .navbar,
            .hero-buttons,
            .slider-controls,
            .scroll-top,
            .footer {
                display: none;
            }
            
            body {
                color: black;
                background: white;
            }
            
            .container {
                max-width: 100%;
                padding: 0;
            }
        }