/* 全局样式重置 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    /* 现代配色方案 */
    :root {
      --primary: #4f46e5;
      --primary-dark: #4338ca;
      --secondary: #10b981;
      --accent: #f59e0b;
      --background: #f8fafc;
      --surface: #ffffff;
      --text-primary: #1e293b;
      --text-secondary: #64748b;
      --border: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background-color: #f8fafc;
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
    }
    
    /* 导航栏 */
    nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    
    nav.scrolled {
      box-shadow: var(--shadow-md);
    }
    
    .nav-container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 5rem;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
    }
    
    .logo img {
      height: 4rem;
    }
    
    .nav-links {
      display: flex;
      gap: 3rem;
      list-style: none;
      font-size: 1.5rem;
    }
    
    .nav-links a {
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 500;
      transition: var(--transition);
      position: relative;
    }
    
    .nav-links a:hover {
      color: var(--primary);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -0.5rem;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: var(--transition);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-primary);
    }
    
    /* 英雄区域 */
    .hero {
      position: relative;
      min-height: 100vh;
      /*display: flex;*/
      align-items: center;
      justify-content: center;
      /* text-align: center; */
      background: linear-gradient(135deg, #667eea73 0%, #592c87cc 100%);
      color: white;
      overflow: hidden;
    }
    
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image: url('../image/bg.jpg');
      background-size: cover;
      background-position: center;
      pointer-events: none;
      opacity: 0.2;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 1.5rem;
    }
    
    .hero h1 {
      font-size: clamp(2.5rem, 8vw, 5rem);
      font-weight: 800;
      margin-bottom: 1.5rem;
      line-height: 1.2;
      text-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .hero h1 span {
      color: var(--accent);
    }
    
    .hero p {
      /* font-size: clamp(1rem, 3vw, 1.25rem); */
      margin-bottom: 2.5rem;
      opacity: 0.95;
    }
    
    .btn-group {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 2rem;
      border-radius: 0.5rem;
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    
    .btn-primary {
      background-color: var(--accent);
      color: white;
      box-shadow: var(--shadow-md);
    }
    
    .btn-primary:hover {
      background-color: #d97706;
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }
    
    .btn-secondary {
      background-color: rgba(255, 255, 255, 0.2);
      color: white;
      border: 2px solid rgba(255, 255, 255, 0.3);
    }
    
    .btn-secondary:hover {
      background-color: rgba(255, 255, 255, 0.3);
      transform: translateY(-2px);
    }
    
    .scroll-indicator {
      position: absolute;
      bottom: 2rem;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
    }
    
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
      }
      40% {
        transform: translateX(-50%) translateY(-20px);
      }
      60% {
        transform: translateX(-50%) translateY(-10px);
      }
    }
    
    /* 特性部分 */
    .features {
      padding: 6rem 0;
      background-color: var(--surface);
    }
    
    .container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 4rem;
    }
    
    .section-title {
      font-size: clamp(1.75rem, 4vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 1rem;
      color: #ffffff;
    }
    
    .section-subtitle {
      font-size: 1.125rem;
      color: #ffffff;
      max-width: 600px;
      margin: 0 auto;
    }
    
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(370px, 1fr));
      gap: 2rem;
    }
    
    .feature-card {
      background-color: var(--surface);
      border-radius: 1rem;
      padding: 1rem;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
      border: 1px solid var(--border);
    }
    
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-xl);
    }
    
    .feature-icon {
      margin-bottom: 1.5rem;
      display: flex;
      justify-content: center;
    }
    
    .feature-icon img {
      max-height: 140px;
      object-fit: contain;
    }
    
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-primary);
      text-align: center;
    }
    
    .feature-card p {
      color: var(--text-secondary);
      margin-bottom: 1.5rem;
      text-align: center;
    }
    
    .feature-btn-group {
      display: flex;
      gap: 0.75rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .btn-sm {
      padding: 0.5rem 3.25rem;
      font-size: 0.975rem;
      border-radius: 0.375rem;
    }
    
    .btn-outline {
      background-color: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }
    
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }
    
    /* 下载部分 */
    .download {
      padding: 6rem 0;
      background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
      color: white;
    }
    
    .download-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
    }
    
    .download-image {
      display: flex;
      justify-content: center;
    }
    
    .download-image img {
      max-width: 100%;
      height: auto;
      border-radius: 1rem;
      box-shadow: var(--shadow-xl);
    }
    
    .download-info h2 {
      font-size: clamp(1.5rem, 4vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 1.5rem;
    }
    
    .download-info p {
      font-size: 1.125rem;
      margin-bottom: 2rem;
      opacity: 0.95;
    }
    
    .feature-list {
      list-style: none;
      margin-bottom: 2.5rem;
    }
    
    .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
      margin-bottom: 1.5rem;
      font-size: 1rem;
    }
    
    .feature-list li i {
      color: var(--secondary);
      font-size: 1.25rem;
      margin-top: 0.25rem;
    }
    
    .download-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    /* 页脚 */
    footer {
      background-color: var(--text-primary);
      color: white;
      padding: 4rem 0 2rem;
    }
    
    .footer-content {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
      margin-bottom: 2rem;
    }
    
    .footer-section h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      color: var(--accent);
    }
    
    .footer-section p {
      color: rgba(255, 255, 255, 0.7);
      margin-bottom: 1.5rem;
    }
    
    .social-links {
      display: flex;
      gap: 1rem;
    }
    
    .social-links a {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 2.5rem;
      height: 2.5rem;
      border-radius: 50%;
      background-color: rgba(255, 255, 255, 0.1);
      color: white;
      text-decoration: none;
      transition: var(--transition);
    }
    
    .social-links a:hover {
      background-color: var(--primary);
      transform: translateY(-2px);
    }
    
    .footer-section ul {
      list-style: none;
    }
    
    .footer-section ul li {
      margin-bottom: 0.75rem;
    }
    
    .footer-section ul li a {
      color: rgba(255, 255, 255, 0.7);
      text-decoration: none;
      transition: var(--transition);
    }
    
    .footer-section ul li a:hover {
      color: var(--accent);
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 2rem;
      text-align: center;
      color: rgba(255, 255, 255, 0.5);
      font-size: 0.875rem;
    }
    
    .footer-bottom a {
      color: rgba(255, 255, 255, 0.7);
      text-decoration: none;
      transition: var(--transition);
    }
    
    .footer-bottom a:hover {
      color: var(--accent);
    }
    
    .footer-logo {
      display: flex;
      justify-content: center;
      margin: 1.5rem 0;
    }
    
    .footer-logo img {
      max-height: 60px;
    }
    
    /* 固定二维码 */
    .fixed-qr {
      position: fixed;
      top: 50%;
      right: 2rem;
      transform: translateY(-50%);
      z-index: 999;
    }
    
    .fixed-qr img {
      width: 120px; 
      border-radius: 0.5rem;
      box-shadow: var(--shadow-lg);
    }
    
    /* 响应式设计 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      
      .mobile-menu-btn {
        display: block;
      }
      
      .download-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
      }
      
      .features-grid {
        grid-template-columns: 1fr;
      }
      
      .fixed-qr {
        right: 1rem;
      }
      
      .fixed-qr img {
        width: 100px;
        height: 100px;
      }
    }
    
    /* 动画效果 */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    .fade-in-up {
      animation: fadeInUp 0.6s ease-out;
    }
    
    /* 平滑滚动 */
    html {
      scroll-behavior: smooth;
    }