* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #64748b;
            --background: #f8fafc;
            --card-bg: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --border: #e2e8f0;
            --success: #10b981;
            --warning: #f59e0b;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
        }
        
        .dark-mode {
            --background: #0f172a;
            --card-bg: #1e293b;
            --text: #f1f5f9;
            --text-light: #94a3b8;
            --border: #334155;
        }
        
        body {
            background-color: var(--background);
            color: var(--text);
            transition: var(--transition);
            line-height: 1.6;
            -webkit-text-size-adjust: 100%;
            -webkit-tap-highlight-color: transparent;
        }
        
        .container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 15px 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, var(--primary), #1e40af);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 24px;
            font-weight: 700;
        }
        
        .logo, .logo:link, .logo:visited, .logo:hover, .logo:active {
            color: #ffffff;
            text-decoration: none;
        }
        
        .logo i {
            font-size: 28px;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        
        nav a {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: var(--transition);
        }
        
        nav a:hover, nav a.active {
            color: white;
        }
        
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: white;
            transition: var(--transition);
        }
        
        nav a:hover::after, nav a.active::after {
            width: 100%;
        }
        
        .header-actions {
            display: flex;
            gap: 15px;
            align-items: center;
        }
        
        .search-box {
            display: flex;
            background: rgba(255, 255, 255, 0.15);
            border-radius: 50px;
            padding: 8px 15px;
            align-items: center;
        }
        
        .search-box input {
            background: transparent;
            border: none;
            color: white;
            outline: none;
            width: 180px;
            padding: 0 10px;
        }
        
        .search-box input::placeholder {
            color: rgba(255, 255, 255, 0.7);
        }
        
        .theme-toggle {
            background: transparent;
            border: none;
            color: white;
            font-size: 20px;
            cursor: pointer;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
            touch-action: manipulation;
        }
        
        .theme-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        
        /* 英雄区域 */
        .hero {
            padding: 60px 0 40px;
            text-align: center;
            background: linear-gradient(to bottom, rgba(37, 99, 235, 0.1), transparent);
        }
        
        .hero h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            background: linear-gradient(to right, var(--primary), #8b5cf6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .hero p {
            font-size: 1.2rem;
            color: var(--text-light);
            max-width: 700px;
            margin: 0 auto 30px;
        }
        
        .stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 30px;
            flex-wrap: wrap;
        }
        
        .stat-item {
            background: var(--card-bg);
            padding: 20px 30px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            min-width: 180px;
        }
        
        .stat-item .number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 5px;
        }
        
        .stat-item .label {
            color: var(--text-light);
            font-size: 0.95rem;
        }
        
        /* 功能区块 */
        .features {
            padding: 60px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 40px;
            font-size: 2rem;
            color: var(--text);
            position: relative;
            padding-bottom: 15px;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }
        
        .feature-card {
            background: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        }
        
        .feature-icon {
            height: 160px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 60px;
            background: linear-gradient(135deg, var(--primary), #8b5cf6);
            color: white;
        }
        
        .feature-content {
            padding: 25px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .feature-content h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: var(--text);
        }
        
        .feature-content p {
            color: var(--text-light);
            margin-bottom: 20px;
            flex-grow: 1;
        }
        
        .feature-content .btn {
            background: var(--primary);
            color: white;
            text-decoration: none;
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 500;
            transition: var(--transition);
            display: inline-block;
            text-align: center;
            margin-top: auto;
            min-height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            touch-action: manipulation;
        }
        
        .feature-content .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }
        
        /* 教程区块 */
        .tutorials {
            padding: 60px 0;
            background: linear-gradient(to bottom, transparent, rgba(37, 99, 235, 0.05));
        }
        
        .tutorials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }
        
        .tutorial-card {
            background: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        
        .tutorial-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        }
        
        .tutorial-image {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        
        .tutorial-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .tutorial-card:hover .tutorial-image img {
            transform: scale(1.05);
        }
        
        .tutorial-content {
            padding: 20px;
        }
        
        .tutorial-content h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--text);
        }
        
        .tutorial-content p {
            color: var(--text-light);
            margin-bottom: 15px;
            font-size: 0.95rem;
        }
        
        .tutorial-meta {
            display: flex;
            justify-content: space-between;
            color: var(--text-light);
            font-size: 0.85rem;
        }
        
        /* 页脚 */
        footer {
            background: var(--card-bg);
            border-top: 1px solid var(--border);
            padding: 40px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h4 {
            margin-bottom: 20px;
            font-size: 1.2rem;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: var(--text-light);
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 0;
            min-height: 44px;
            touch-action: manipulation;
        }
        
        .footer-links a:hover {
            color: var(--primary);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            color: var(--text-light);
            font-size: 0.9rem;
        }
        
        .about-text {
            text-indent: 2em;
            text-align: left;
            line-height: 1.6;
        }
        
        /* 移动端菜单 */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 24px;
            cursor: pointer;
            padding: 12px;
            min-width: 48px;
            min-height: 48px;
            border-radius: 8px;
            align-items: center;
            justify-content: center;
            touch-action: manipulation;
            transition: var(--transition);
        }
        
        .mobile-menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--primary-dark);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            z-index: 99;
            border-radius: 0 0 12px 12px;
            overflow: hidden;
        }
        
        .mobile-nav.active {
            display: block;
            animation: slideDown 0.3s ease-out;
        }
        
        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .mobile-nav ul {
            flex-direction: column;
            padding: 0;
            gap: 0;
            margin: 0;
        }
        
        .mobile-nav li {
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            transition: background-color 0.2s ease;
        }
        
        .mobile-nav li:last-child {
            border-bottom: none;
        }
        
        .mobile-nav li:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        
        .mobile-nav a {
            display: block;
            padding: 16px 20px;
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        
        .mobile-nav a:hover {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.05);
        }
        
        .mobile-nav a.active {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.1);
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .container {
                padding: 12px 16px;
            }
            
            .hero h1 {
                font-size: 2.4rem;
            }
            
            .features-grid, .tutorials-grid {
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
                gap: 20px;
            }
            
            .footer-content {
                grid-template-columns: repeat(3, 1fr);
                gap: 25px;
            }
        }
        
        @media (max-width: 900px) {
            .header-content {
                flex-wrap: wrap;
                gap: 15px;
            }
            
            nav {
                order: 3;
                width: 100%;
            }
            
            nav ul {
                justify-content: center;
            }
            
            .hero h1 {
                font-size: 2.2rem;
            }
            
            .stat-item {
                padding: 15px 20px;
                min-width: 140px;
            }
            
            .stat-item .number {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 768px) {
            .mobile-menu-toggle {
                display: flex;
            }
            
            .desktop-nav {
                display: none;
            }
            
            .header-content {
                flex-wrap: nowrap;
                justify-content: space-between;
                align-items: center;
            }
            
            .header-actions {
                gap: 8px;
                order: 2;
            }
            
            .search-box {
                display: none;
            }
            
            .logo {
                order: 1;
                flex: 1;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .hero p {
                font-size: 1rem;
            }
            
            .stats {
                flex-direction: column;
                gap: 15px;
            }
            
            .stat-item {
                min-width: auto;
                width: 100%;
                max-width: 300px;
                margin: 0 auto;
            }
            
            .features-grid, .tutorials-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        
        @media (max-width: 600px) {
            .hero {
                padding: 30px 0 15px;
            }
            
            .hero h1 {
                font-size: 1.6rem;
            }
            
            .container {
                padding: 10px 15px;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        
        @media (max-width: 480px) {
            .logo {
                font-size: 20px;
            }
            
            .logo i {
                font-size: 24px;
            }
            
            .hero h1 {
                font-size: 1.4rem;
            }
            
            .hero p {
                font-size: 0.9rem;
            }
            
            .stat-item .number {
                font-size: 1.8rem;
            }
            
            .stat-item .label {
                font-size: 0.85rem;
            }
            
            .about-text {
                text-indent: 0;
                text-align: center;
                font-size: 0.9rem;
            }
            
            .footer-column h4 {
                font-size: 1.1rem;
            }
            
            .footer-links a {
                font-size: 0.9rem;
                padding: 8px 0;
            }
            
            .copyright p {
                font-size: 0.8rem;
                line-height: 1.5;
            }
            
            .mobile-menu-toggle {
                min-width: 44px;
                min-height: 44px;
                padding: 10px;
            }
            
            .mobile-nav a {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
        }
        
        /* 超小屏幕优化 */
        @media (max-width: 360px) {
            .container {
                padding: 8px 12px;
            }
            
            .hero {
                padding: 20px 0 10px;
            }
            
            .hero h1 {
                font-size: 1.2rem;
                margin-bottom: 10px;
            }
            
            .hero p {
                font-size: 0.85rem;
                margin-bottom: 20px;
            }
            
            .stat-item {
                padding: 12px 15px;
            }
            
            .stat-item .number {
                font-size: 1.6rem;
            }
            
            .stat-item .label {
                font-size: 0.8rem;
            }
            
            .feature-content {
                padding: 20px;
            }
            
            .feature-content h3 {
                font-size: 1.2rem;
            }
            
            .feature-content p {
                font-size: 0.9rem;
            }
            
            .tutorial-content {
                padding: 15px;
            }
            
            .tutorial-content h3 {
                font-size: 1.1rem;
            }
            
            .tutorial-content p {
                font-size: 0.85rem;
            }
            
            .logo {
                font-size: 18px;
            }
            
            .logo i {
                font-size: 22px;
            }
        }