:root {
     --primary: #1a73e8;
     --primary-dark: #0d5cb6;
     --secondary: #0f9d58;
     --dark: #202124;
     --light: #f8f9fa;
     --gray: #5f6368;
     --border: #dadce0;
 }

 * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
     font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
 }

 body {
     color: var(--dark);
     line-height: 1.6;
     overflow-x: hidden;
 }

 a {
     text-decoration: none;
     color: inherit;
 }

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

 /* 导航栏样式 */
 header {
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     background-color: white;
     box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
     z-index: 1000;
     transition: all 0.3s ease;
 }

 .header-container {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 15px 0;
 }

 .logo {
     display: flex;
     align-items: center;
 }

 .logo i {
     font-size: 28px;
     color: var(--primary);
     margin-right: 10px;
 }

 .logo h1 {
     font-size: 24px;
     font-weight: 700;
 }

 .logo span {
     color: var(--primary);
 }

 nav ul {
     display: flex;
     list-style: none;
 }

 nav ul li {
     margin: 0 15px;
 }

 nav ul li a {
     font-weight: 500;
     padding: 8px 0;
     position: relative;
 }

 nav ul li a::after {
     content: '';
     position: absolute;
     bottom: 0;
     left: 0;
     width: 0;
     height: 2px;
     background-color: var(--primary);
     transition: width 0.3s;
 }

 nav ul li a:hover::after {
     width: 100%;
 }

 .btn {
     padding: 10px 20px;
     border-radius: 4px;
     font-weight: 500;
     cursor: pointer;
     transition: all 0.3s;
     text-align: center;
     display: inline-block;
 }

 .btn-primary {
     background-color: var(--primary);
     color: white;
     border: 2px solid var(--primary);
 }

 .btn-primary:hover {
     background-color: var(--primary-dark);
     border-color: var(--primary-dark);
 }

 .btn-outline {
     border: 2px solid var(--primary);
     color: var(--primary);
     margin-right: 10px;
 }

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

 .mobile-toggle {
     display: none;
     font-size: 24px;
     cursor: pointer;
 }

 /* 首页中间区域 */
 .middle-content {
     height: 100vh;
     background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(13, 92, 182, 0.1) 100%);
     display: flex;
     align-items: center;
     padding-top: 80px;
     position: relative;
     overflow: hidden;
 }

 .middle-content-content {
     max-width: 600px;
     z-index: 2;
 }

 .middle-content h2 {
     font-size: 48px;
     line-height: 1.2;
     margin-bottom: 20px;
 }

 .middle-content p {
     font-size: 18px;
     color: var(--gray);
     margin-bottom: 30px;
 }

 .middle-content-btns {
     display: flex;
     gap: 15px;
 }

 .middle-content-image {
     position: absolute;
     right: 0;
     top: 50%;
     transform: translateY(-50%);
     max-width: 50%;
     z-index: 1;
     opacity: 0.9;
 }





 /* 页脚样式 */
 footer {
     background-color: var(--dark);
     color: white;
     padding: 70px 0 20px;
 }

 .footer-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
     gap: 40px;
     margin-bottom: 50px;
 }

 .footer-col h3 {
     font-size: 20px;
     margin-bottom: 20px;
     position: relative;
     padding-bottom: 10px;
 }

 .footer-col h3::after {
     content: '';
     position: absolute;
     bottom: 0;
     left: 0;
     width: 40px;
     height: 3px;
     background-color: var(--primary);
 }

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

 .footer-links li {
     margin-bottom: 10px;
 }

 .footer-links a {
     color: #bdc1c6;
     transition: all 0.3s;
 }

 .footer-links a:hover {
     color: white;
     padding-left: 5px;
 }

 .footer-contact p {
     margin-bottom: 10px;
     color: #bdc1c6;
     display: flex;
     align-items: flex-start;
 }

 .footer-contact i {
     margin-right: 10px;
     color: var(--primary);
 }

 .copyright {
     text-align: center;
     padding-top: 20px;
     border-top: 1px solid rgba(255, 255, 255, 0.1);
     color: #bdc1c6;
     font-size: 14px;
 }

 .beian-info {
     position: absolute;
     bottom: 20px;
     font-size: 16px;
     display: flex;
     width: 100%;
     justify-content: center;
 }

 .beian-info div {
     padding: 0 15px;
     height: 60px;
     display: flex;
     align-items: center;
 }

 .beian-info img {
     width: 16px;
     height: 17px;
     margin-right: 5px;
 }

 /* 响应式设计 */
 @media (max-width: 992px) {
     .middle-content h2 {
         font-size: 40px;
     }

     .middle-content-image {
         max-width: 45%;
     }

     .about-content {
         flex-direction: column;
     }
 }

 @media (max-width: 768px) {
     .mobile-toggle {
         display: block;
     }

     nav {
         position: absolute;
         top: 100%;
         left: 0;
         width: 100%;
         background-color: white;
         padding: 20px;
         box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
         clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
         transition: all 0.4s ease;
     }

     nav.active {
         clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
     }

     nav ul {
         flex-direction: column;
     }

     nav ul li {
         margin: 10px 0;
     }

     .middle-content {
         text-align: center;
     }

     .middle-content-btns {
         justify-content: center;
     }

     .middle-content-image {
         display: none;
     }

     .stats {
         grid-template-columns: 1fr;
     }
 }

 @media (max-width: 480px) {
     .middle-content h2 {
         font-size: 32px;
     }

     .middle-content-btns {
         flex-direction: column;
         gap: 10px;
     }

     .section-title {
         font-size: 28px;
     }

     .section-subtitle {
         font-size: 16px;
     }
 }