/* 基础样式 */
    :root {
      --primary-color: #2c7be5;
      --secondary-color: #00c9a7;
      --dark-color: #1a365d;
      --light-color: #f8f9fc;
    }
    
    body {
      font-family: 'Segoe UI', 'Noto Sans SC', system-ui, sans-serif;
      color: #333;
      background-color: #f8f9fc;
      line-height: 1.6;
      scroll-behavior: smooth;
    }
    
    /* 导航栏样式 */
    .navbar {
      background-color: white;
      box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 1000;
      transition: all 0.3s ease;
    }
    
    .nav-scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
      background-color: rgba(255, 255, 255, 0.98);
    }
    
    .logo-text {
      color: var(--dark-color);
      font-weight: 700;
      letter-spacing: 0.5px;
    }
    
    .nav-links a {
      position: relative;
      padding: 5px 0;
      color: #4a5568;
      transition: color 0.3s;
    }
    
    .nav-links a:hover {
      color: var(--primary-color);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-color);
      transition: width 0.3s;
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    /* 登录按钮优化 */
    .login-button {
      background: var(--primary-color);
      color: white;
      padding: 10px 30px;
      border-radius: 10px;
      font-weight: 500;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      box-shadow: 0 4px 12px rgba(44, 123, 229, 0.3);
    }
    
    .login-button:hover {
      background: #1a6ad8;
      transform: translateY(-2px);
      box-shadow: 0 6px 15px rgba(44, 123, 229, 0.4);
    }
    
    .login-button i {
      margin-right: 8px;
      transition: transform 0.3s ease;
    }
    
    .login-button:hover i {
      transform: translateX(3px);
    }
    
    /* 汉堡菜单 */
    .hamburger {
      display: none;
      cursor: pointer;
      width: 30px;
      height: 30px;
      position: relative;
      z-index: 100;
    }
    
    .hamburger span {
      display: block;
      position: absolute;
      height: 3px;
      width: 100%;
      background: var(--primary-color);
      border-radius: 2px;
      opacity: 1;
      left: 0;
      transform: rotate(0deg);
      transition: all 0.3s ease;
    }
    
    .hamburger span:nth-child(1) {
      top: 5px;
    }
    
    .hamburger span:nth-child(2) {
      top: 13px;
    }
    
    .hamburger span:nth-child(3) {
      top: 21px;
    }
    
    .hamburger.active span:nth-child(1) {
      top: 13px;
      transform: rotate(135deg);
    }
    
    .hamburger.active span:nth-child(2) {
      opacity: 0;
      left: -30px;
    }
    
    .hamburger.active span:nth-child(3) {
      top: 13px;
      transform: rotate(-135deg);
    }
    
    /* 主视觉区域 */
    .hero-section {
      position: relative;
      height: 100vh;
      min-height: 600px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    
    .hero-content {
      position: relative;
      z-index: 10;
      max-width: 800px;
      padding: 0 20px;
      text-align: center;
    }
    
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(120deg, rgba(44, 123, 229, 0.8), rgba(0, 201, 167, 0.6));
      z-index: 1;
    }
    
    .hero-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
      opacity: 0.5;
    }
    
    /* 卡片样式 */
    .feature-card {
      background: white;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
      transition: all 0.3s ease;
      height: 100%;
    }
    
    .feature-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
    }
    
    .stat-card {
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: white;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
      transition: all 0.3s ease;
    }
    
    .stat-card:hover {
      transform: scale(1.05);
    }
    
    /* 动画效果 */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    .fade-in-up {
      animation: fadeInUp 0.8s ease forwards;
      opacity: 0;
    }
    
    .animation-delay-100 {
      animation-delay: 0.1s;
    }
    
    .animation-delay-200 {
      animation-delay: 0.2s;
    }
    
    .animation-delay-300 {
      animation-delay: 0.3s;
    }
    
    /* 响应式设计 - 多端布局优化 */
    @media (max-width: 1200px) {
      .nav-links a {
        margin: 0 12px;
      }
      
      .hero-content h1 {
        font-size: 3.2rem;
      }
    }
    
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: 300px;
        background: white;
        flex-direction: column;
        padding: 100px 40px 40px;
        box-shadow: -5px 0 25px rgba(0, 0, 0, 0.1);
        z-index: 99;
        overflow-y: auto;
      }
      
      .nav-links.active {
        display: flex;
      }
      
      .nav-links a {
        padding: 15px 0;
        width: 100%;
        text-align: left;
        border-bottom: 1px solid #eee;
        margin: 0 0 10px 0;
      }
      
      .nav-links a:last-child {
        border-bottom: none;
      }
      
      .hamburger {
        display: block;
      }
      
      .hero-section {
        height: 80vh;
      }
      
      .hero-content h1 {
        font-size: 2.8rem;
      }
    }
    
    @media (max-width: 768px) {
      .hero-section {
        height: 70vh;
      }
      
      .hero-content h1 {
        font-size: 2.4rem;
      }
      
      .hero-content p {
        font-size: 1.1rem;
      }
      
      .stat-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      
      .footer-content {
        grid-template-columns: 1fr;
      }
    }
    
    @media (max-width: 576px) {
      .logo-text {
        font-size: 1.4rem;
      }
      
      .hero-section {
        height: 60vh;
      }
      
      .hero-content h1 {
        font-size: 2rem;
      }
      
      .section-title {
        font-size: 1.8rem;
      }
      
      .stat-grid {
        grid-template-columns: 1fr;
      }
      
      .partner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      
      .nav-links {
        width: 100%;
      }
    }
    
    @media (max-width: 400px) {
      .hero-content h1 {
        font-size: 1.8rem;
      }
      
      .login-button {
        padding: 8px 16px;
        font-size: 0.9rem;
      }
      
      .partner-grid {
        grid-template-columns: 1fr;
      }
    }