/* 页面头部 */
 .page-header {
     background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-dark) 100%);
     padding: 160px 5% 80px;
     text-align: center;
     color: white;
     position: relative;
     overflow: hidden;
 }
 
 .page-header::before {
     content: '';
     position: absolute;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     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="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
     opacity: 0.3;
 }
 
 .page-title {
     font-size: 3.2rem;
     font-weight: 800;
     margin-bottom: 20px;
     position: relative;
 }
 
 .page-subtitle {
     font-size: 1.2rem;
     max-width: 800px;
     margin: 0 auto;
     opacity: 0.9;
     line-height: 1.6;
 }
 
 /* 内容区块 */
 .section {
     padding: 100px 5%;
 }
 
 .section-light {
     background: white;
 }
 
 .section-gray {
     background: #f8fafc;
 }
 
 .container {
     max-width: 1200px;
     margin: 0 auto;
 }
 
 .section-header {
     text-align: center;
     margin-bottom: 80px;
 }
 
 .section-title {
     font-size: 2.8rem;
     font-weight: 700;
     margin-bottom: 20px;
     color: var(--dark);
     position: relative;
     display: inline-block;
 }
 
 .section-title::after {
     content: '';
     position: absolute;
     bottom: -15px;
     left: 50%;
     transform: translateX(-50%);
     width: 80px;
     height: 4px;
     background: var(--gradient);
     border-radius: 2px;
 }
 
 .section-subtitle {
     font-size: 1.2rem;
     color: var(--gray);
     max-width: 800px;
     margin: 30px auto 0;
     line-height: 1.6;
 }
 
 /* 系统概览 */
 .system-overview {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 60px;
     align-items: center;
     margin-bottom: 80px;
 }
 
 .system-content {
     display: flex;
     flex-direction: column;
     gap: 24px;
 }
 
 .system-title {
     font-size: 2rem;
     font-weight: 700;
     color: var(--dark);
 }
 
 .system-desc {
     font-size: 1.1rem;
     color: var(--gray);
     line-height: 1.7;
 }
 
 .system-stats {
     display: grid;
     grid-template-columns: repeat(2, 1fr);
     gap: 20px;
     margin-top: 20px;
 }
 
 .system-stat {
     text-align: center;
     padding: 20px;
     background: #f8fafc;
     border-radius: 12px;
 }
 
 .system-stat-value {
     font-size: 2rem;
     font-weight: 700;
     color: var(--primary);
     line-height: 1;
     margin-bottom: 5px;
 }
 
 .system-stat-label {
     font-size: 0.9rem;
     color: var(--gray);
 }
 
 .system-image {
     border-radius: 20px;
     overflow: hidden;
     box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
 }
 
 .system-image img {
     width: 100%;
     height: auto;
     display: block;
 }
 
 /* 核心功能 */
 .features-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
     gap: 40px;
 }
 
 .feature-card {
     background: white;
     border-radius: 16px;
     padding: 40px;
     box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
     transition: all 0.3s ease;
     text-align: center;
     border-top: 4px solid var(--primary);
 }
 
 .feature-card:hover {
     transform: translateY(-8px);
     box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
 }
 
 .feature-icon {
     width: 80px;
     height: 80px;
     background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(29, 78, 216, 0.1));
     border-radius: 20px;
     display: flex;
     align-items: center;
     justify-content: center;
     margin: 0 auto 24px;
 }
 
 .feature-icon i {
     font-size: 36px;
     color: var(--primary);
 }
 
 .feature-title {
     font-size: 1.5rem;
     font-weight: 600;
     margin-bottom: 16px;
     color: var(--dark);
 }
 
 .feature-desc {
     color: var(--gray);
     line-height: 1.6;
 }
 
 /* 工作流程 */
 .workflow {
     background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 100%);
     color: white;
     padding: 100px 5%;
 }
 
 .workflow-title {
     font-size: 2.5rem;
     font-weight: 700;
     margin-bottom: 20px;
     text-align: center;
 }
 
 .workflow-steps {
     display: flex;
     justify-content: space-between;
     position: relative;
     margin: 60px auto 0;
     max-width: 1000px;
 }
 
 .workflow-steps::before {
     content: '';
     position: absolute;
     top: 40px;
     left: 0;
     right: 0;
     height: 2px;
     background: rgba(255, 255, 255, 0.2);
     z-index: 1;
 }
 
 .workflow-step {
     text-align: center;
     position: relative;
     z-index: 2;
     flex: 1;
 }
 
 .step-number {
     width: 80px;
     height: 80px;
     background: var(--gradient);
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
     color: white;
     font-size: 1.5rem;
     font-weight: 700;
     margin: 0 auto 20px;
 }
 
 .step-title {
     font-size: 1.2rem;
     font-weight: 600;
     margin-bottom: 10px;
 }
 
 .step-desc {
     opacity: 0.8;
     line-height: 1.6;
     font-size: 0.95rem;
     padding: 0 10px;
 }
 
 /* AI技术优势 */
 .ai-advantages {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
     gap: 40px;
 }
 
 .ai-card {
     background: white;
     border-radius: 16px;
     padding: 40px;
     box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
     transition: all 0.3s ease;
 }
 
 .ai-card:hover {
     transform: translateY(-5px);
     box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
 }
 
 .ai-header {
     display: flex;
     align-items: center;
     gap: 15px;
     margin-bottom: 20px;
 }
 
 .ai-icon {
     width: 60px;
     height: 60px;
     background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(29, 78, 216, 0.1));
     border-radius: 12px;
     display: flex;
     align-items: center;
     justify-content: center;
 }
 
 .ai-icon i {
     font-size: 24px;
     color: var(--primary);
 }
 
 .ai-title {
     font-size: 1.3rem;
     font-weight: 600;
     color: var(--dark);
 }
 
 .ai-desc {
     color: var(--gray);
     line-height: 1.6;
 }
 
 /* 客户案例 */
 .case-studies {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
     gap: 40px;
 }
 
 .case-card {
     background: white;
     border-radius: 16px;
     overflow: hidden;
     box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
     transition: all 0.3s ease;
 }
 
 .case-card:hover {
     transform: translateY(-5px);
     box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
 }
 
 .case-image {
     width: 100%;
     height: 200px;
     object-fit: cover;
 }
 
 .case-content {
     padding: 30px;
 }
 
 .case-title {
     font-size: 1.3rem;
     font-weight: 600;
     margin-bottom: 12px;
     color: var(--dark);
 }
 
 .case-desc {
     color: var(--gray);
     line-height: 1.6;
     margin-bottom: 20px;
 }
 
 .case-stats {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 15px;
 }
 
 .case-stat {
     text-align: center;
     padding: 15px;
     background: #f8fafc;
     border-radius: 8px;
 }
 
 .case-stat-value {
     font-size: 1.5rem;
     font-weight: 700;
     color: var(--primary);
     line-height: 1;
     margin-bottom: 5px;
 }
 
 .case-stat-label {
     font-size: 0.9rem;
     color: var(--gray);
 }
 
 /* 系统演示 */
 .demo {
     background: #f8fafc;
     padding: 100px 5%;
     text-align: center;
 }
 
 .demo-container {
     max-width: 1000px;
     margin: 0 auto;
     background: white;
     border-radius: 16px;
     padding: 50px;
     box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
 }
 
 .demo-title {
     font-size: 2rem;
     font-weight: 700;
     margin-bottom: 30px;
     color: var(--dark);
 }
 
 .demo-placeholder {
     background: #f1f5f9;
     border-radius: 12px;
     padding: 60px;
     margin-bottom: 30px;
     position: relative;
     overflow: hidden;
 }
 
 .demo-placeholder::before {
     content: '';
     position: absolute;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     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="rgba(37,99,235,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
 }
 
 .demo-placeholder-content {
     position: relative;
     z-index: 2;
 }
 
 .demo-placeholder-icon {
     font-size: 3rem;
     color: var(--primary);
     margin-bottom: 20px;
 }
 
 .demo-placeholder-text {
     color: var(--gray);
     margin-bottom: 30px;
 }
 
 .demo-buttons {
     display: flex;
     gap: 15px;
     justify-content: center;
 }
 
 .demo-btn {
     padding: 12px 24px;
     border-radius: 8px;
     font-weight: 500;
     text-decoration: none;
     transition: all 0.3s ease;
     display: inline-flex;
     align-items: center;
     gap: 8px;
 }
 
 .demo-btn-primary {
     background: var(--gradient);
     color: white;
 }
 
 .demo-btn-primary:hover {
     transform: translateY(-2px);
     box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
 }
 
 .demo-btn-secondary {
     background: white;
     color: var(--dark);
     border: 1px solid var(--light-gray);
 }
 
 .demo-btn-secondary:hover {
     background: #f8fafc;
     transform: translateY(-2px);
 }
 
 /* CTA部分 */
 .cta {
     padding: 100px 5%;
     background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-dark) 100%);
     color: white;
     text-align: center;
     position: relative;
     overflow: hidden;
 }
 
 .cta::before {
     content: '';
     position: absolute;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     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="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
     opacity: 0.3;
 }
 
 .cta-content {
     position: relative;
     z-index: 2;
     max-width: 800px;
     margin: 0 auto;
 }
 
 .cta-title {
     font-size: 2.8rem;
     font-weight: 700;
     margin-bottom: 20px;
 }
 
 .cta-text {
     font-size: 1.2rem;
     margin-bottom: 40px;
     opacity: 0.9;
     line-height: 1.6;
 }
 
 .cta-buttons {
     display: flex;
     gap: 20px;
     justify-content: center;
 }
 
 .btn {
     padding: 16px 32px;
     border-radius: 8px;
     font-weight: 500;
     text-decoration: none;
     transition: all 0.3s ease;
     display: inline-flex;
     align-items: center;
     gap: 10px;
     font-size: 1rem;
 }
 
 .btn-primary {
     background: white;
     color: var(--primary);
     box-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
 }
 
 .btn-primary:hover {
     transform: translateY(-3px);
     box-shadow: 0 8px 25px rgba(255, 255, 255, 0.4);
 }
 
 .btn-secondary {
     background: transparent;
     color: white;
     border: 2px solid white;
 }
 
 .btn-secondary:hover {
     background: rgba(255, 255, 255, 0.1);
     transform: translateY(-3px);
 }
 
 
 
 /* 响应式设计 */
 @media (max-width: 1024px) {
     .system-overview {
         grid-template-columns: 1fr;
         gap: 40px;
     }
     
     .workflow-steps {
         flex-direction: column;
         gap: 40px;
     }
     
     .workflow-steps::before {
         display: none;
     }
     
     .footer-container {
         grid-template-columns: repeat(2, 1fr);
     }
 }
 
 @media (max-width: 768px) {
     .nav-links {
         display: none;
     }
     
     .page-title {
         font-size: 2.5rem;
     }
     
     .section-title {
         font-size: 2.2rem;
     }
     
     .system-stats {
         grid-template-columns: 1fr;
     }
     
     .features-grid {
         grid-template-columns: 1fr;
     }
     
     .ai-advantages {
         grid-template-columns: 1fr;
     }
     
     .case-studies {
         grid-template-columns: 1fr;
     }
     
     .demo-buttons {
         flex-direction: column;
     }
     
     .cta-buttons {
         flex-direction: column;
     }
     
     .footer-container {
         grid-template-columns: 1fr;
         gap: 30px;
     }
 }
 
 @media (max-width: 480px) {
     .page-title {
         font-size: 2rem;
     }
     
     .section-title {
         font-size: 1.8rem;
     }
     
     .feature-card,
     .ai-card,
     .case-card {
         padding: 30px;
     }
     
     .demo-container {
         padding: 30px;
     }
 }