/* Basic Reset & Fonts */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body, html {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #2d3748;
            line-height: 1.7;
            scroll-behavior: smooth;
            overflow-x: hidden;
        }
        
        /* Google Fonts 需要从 hifusion.net 服务器加载 */
@import url('https://www.hifusion.net/fonts/inter.css');
        
        /* Smooth animations */
        * {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* Container */
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            padding: 1.2rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
        }
        
        header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }
        
        nav {
            display: flex;
            gap: 2rem;
        }
        
        nav a {
            text-decoration: none;
            color: #4a5568;
            font-weight: 500;
            font-size: 0.95rem;
            position: relative;
            padding: 0.5rem 0;
        }
        
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            transition: width 0.3s ease;
        }
        
        nav a:hover::after {
            width: 100%;
        }
        
        nav a:hover {
            color: #667eea;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.8), rgba(118, 75, 162, 0.8)), 
                        url('../uploads/hero-background.svg') center/cover no-repeat,
                        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3), transparent 50%),
                        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3), transparent 50%);
            color: white;
            text-align: center;
            padding: 120px 20px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            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 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
            opacity: 0.3;
        }
        
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        
        .hero h1 {
            font-size: clamp(2.5rem, 5vw, 4.5rem);
            font-weight: 800;
            margin-bottom: 1.5rem;
            line-height: 1.1;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .hero p {
            font-size: 1.25rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
            font-weight: 400;
            line-height: 1.6;
        }
        
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 1rem 2rem;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.1rem;
            border: 1px solid rgba(255, 255, 255, 0.2);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
        }
        
        .btn:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
        }
        
        .btn:active {
            transform: translateY(-1px);
        }

        /* Section Styling */
        .section {
            padding: 100px 0;
            text-align: center;
            position: relative;
        }
        
        .section:nth-child(odd) {
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
        }
        
        .section:nth-child(even) {
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
        }
        
        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 700;
            margin-bottom: 3rem;
            position: relative;
            color: #1a202c;
            letter-spacing: -0.02em;
        }
        
        .section-title::after {
            content: '';
            width: 80px;
            height: 4px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        
        .section-subtitle {
            font-size: 1.2rem;
            color: #64748b;
            margin-bottom: 4rem;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }

        /* Features Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
            text-align: left;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .feature-item {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            padding: 2.5rem;
            border-radius: 20px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            position: relative;
            overflow: hidden;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        .feature-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }
        
        .feature-item:hover::before {
            transform: scaleX(1);
        }
        
        .feature-item:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
        }
        
        .feature-item h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin-top: 0;
            margin-bottom: 1rem;
            color: #1a202c;
            line-height: 1.3;
        }
        
        .feature-item p {
            color: #64748b;
            line-height: 1.6;
            margin: 0;
        }
        
        .feature-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
            color: white;
        }

        /* How it Works */
        .how-it-works-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            align-items: center;
            gap: 4rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .how-it-works-text {
            text-align: left;
        }
        
        .how-it-works-text ul {
            list-style: none;
            padding: 0;
            margin: 2rem 0;
        }
        
        .how-it-works-text li {
            padding: 1rem 0;
            border-bottom: 1px solid rgba(0, 0, 0, 0.1);
            position: relative;
            padding-left: 2rem;
        }
        
        .how-it-works-text li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 1rem;
            width: 24px;
            height: 24px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            font-weight: bold;
        }
        
        .how-it-works-img {
            width: 100%;
            height: auto;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
        }
        
        @media (max-width: 768px) {
            .how-it-works-content {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }

        /* Screenshots */
        .screenshots-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            max-width: 1000px;
            margin: 0 auto;
            justify-items: center;
            text-align: center;
        }
        
        .screenshot-img {
            width: 100%;
            max-width: 350px;
            border-radius: 20px;
            box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: block;
            margin: 0 auto;
        }
        
        .screenshot-img:hover {
            transform: translateY(-10px) scale(1.02);
            box-shadow: 0 25px 70px rgba(0, 0, 0, 0.2);
        }

        /* Download Section */
        .download {
            background: linear-gradient(135deg, #4c51bf 0%, #553c9a 100%);
            color: #1a202c;
            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 0 100 100"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>') repeat;
        }
        
        .download .container {
            position: relative;
            z-index: 2;
        }
        
        .download .section-title::after {
            background: rgba(255, 255, 255, 0.8);
        }
        
        .download-buttons {
            margin-top: 3rem;
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 1rem 2rem;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            color: #1a202c;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.3s ease;
        }
        
        .download-btn:hover {
            background: rgba(255, 255, 255, 1);
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

        /* Footer */
        footer {
            background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
            color: #e2e8f0;
            text-align: center;
            padding: 4rem 2rem 2rem;
            position: relative;
            overflow: hidden;
        }
        
        footer::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 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23ffffff" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>') repeat;
        }
        
        footer .container {
            position: relative;
            z-index: 2;
        }
        
        .footer-links {
            margin-bottom: 2rem;
        }
        
        .footer-links a {
            color: #cbd5e0;
            margin: 0 1.5rem;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .footer-links a:hover {
            color: #667eea;
            text-decoration: none;
        }
        
        .copyright {
            margin-top: 2rem;
            font-size: 0.9rem;
            opacity: 0.8;
        }
        
        .icp {
            margin-top: 1rem;
            font-size: 0.8rem;
            opacity: 0.6;
        }
        
        .icp a {
            color: #94a3b8;
            text-decoration: none;
        }
        
        .icp a:hover {
            color: #cbd5e0;
        }
        
        /* Mobile Navigation Toggle */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: #4a5568;
            cursor: pointer;
            padding: 0.5rem;
        }
        
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(20px);
            border-top: 1px solid rgba(0, 0, 0, 0.1);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            z-index: 1000;
        }
        
        .mobile-nav.active {
            display: block;
        }
        
        .mobile-nav a {
            display: block;
            padding: 1rem 2rem;
            color: #4a5568;
            text-decoration: none;
            font-weight: 500;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }
        
        .mobile-nav a:hover {
            background: rgba(102, 126, 234, 0.1);
            color: #667eea;
        }

        /* Enhanced Mobile Responsive Design */
        @media (max-width: 768px) {
            /* Header Mobile Optimization */
            header {
                padding: 1rem 0;
                position: relative;
            }
            
            header .container {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
            }
            
            .logo {
                font-size: 1.4rem;
            }
            
            nav {
                display: none;
            }
            
            .mobile-menu-toggle {
                display: block;
            }
            
            /* Hero Section Mobile */
            .hero {
                padding: 80px 20px 60px;
                min-height: 80vh;
            }
            
            .hero h1 {
                font-size: 2.2rem;
                margin-bottom: 1rem;
                line-height: 1.2;
            }
            
            .hero p {
                font-size: 1rem;
                margin-bottom: 2rem;
                line-height: 1.5;
            }
            
            .btn {
                padding: 0.8rem 1.5rem;
                font-size: 1rem;
                width: auto;
                min-width: 200px;
            }
            
            /* Sections Mobile */
            .section {
                padding: 60px 0;
            }
            
            .container {
                padding: 0 15px;
            }
            
            .section-title {
                font-size: 2rem;
                margin-bottom: 2rem;
            }
            
            .section-subtitle {
                font-size: 1rem;
                margin-bottom: 2.5rem;
            }
            
            /* Features Grid Mobile */
            .features-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            
            .feature-item {
                padding: 2rem 1.5rem;
                text-align: center;
            }
            
            .feature-icon {
                margin: 0 auto 1.5rem;
            }
            
            /* How it Works Mobile */
            .how-it-works-content {
                grid-template-columns: 1fr;
                gap: 2rem;
                text-align: center;
            }
            
            .how-it-works-text {
                text-align: left;
            }
            
            .how-it-works-text ul {
                margin: 1.5rem 0;
            }
            
            .how-it-works-text li {
                padding: 0.8rem 0;
                font-size: 0.9rem;
                line-height: 1.5;
            }
            
            .how-it-works-img {
                width: 100%;
                max-width: 400px;
                margin: 0 auto;
                display: block;
            }
            
            /* Screenshots Mobile */
            .screenshots-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
                justify-items: center;
                text-align: center;
            }
            
            .screenshot-img {
                max-width: 300px;
                width: 100%;
                margin: 0 auto;
                display: block;
            }
            
            /* Download Section Mobile */
            .download-buttons {
                flex-direction: column;
                align-items: center;
                gap: 1rem;
            }
            
            .download-btn {
                width: 200px;
                justify-content: center;
                padding: 1rem;
            }
            
            /* Footer Mobile */
            .footer-links {
                display: flex;
                flex-direction: column;
                gap: 0.5rem;
            }
            
            .footer-links a {
                margin: 0;
                padding: 0.5rem 0;
            }
        }
        
        /* Extra Small Mobile Devices */
        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            
            .hero p {
                font-size: 0.9rem;
            }
            
            .section-title {
                font-size: 1.6rem;
            }
            
            .feature-item {
                padding: 1.5rem 1rem;
            }
            
            .btn, .download-btn {
                padding: 0.7rem 1.2rem;
                font-size: 0.9rem;
            }
            
            .container {
                padding: 0 10px;
            }
        }
        
        /* Tablet Responsive */
        @media (min-width: 769px) and (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 2rem;
            }
            
            .screenshots-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .hero h1 {
                font-size: 3.5rem;
            }
        }
        
        /* Touch-friendly improvements */
        @media (hover: none) and (pointer: coarse) {
            .btn, .download-btn {
                min-height: 44px;
                padding: 1rem 2rem;
            }
            
            .feature-item:hover {
                transform: none;
            }
            
            .screenshot-img:hover {
                transform: none;
            }
            
            nav a {
                padding: 1rem 0.5rem;
            }
        }