/* 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;
}

/* 系统概览 */
.system-overview {
    padding: 100px 5%;
    background: white;
}

.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;
}

.overview-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.overview-text {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.overview-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
}

.overview-desc {
    font-size: 1.1rem;
    color: var(--gray);
    line-height: 1.7;
}

.overview-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.overview-stat {
    text-align: center;
    padding: 20px;
    background: #f8fafc;
    border-radius: 12px;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
}

.overview-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.overview-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 核心功能 */
.core-features {
    padding: 100px 5%;
    background: #f8fafc;
}

.features-tabs {
    display: flex;
    gap: 0;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    margin-bottom: 40px;
}

.feature-tab {
    flex: 1;
    padding: 20px;
    text-align: center;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.feature-tab.active {
    background: #f1f5f9;
    border-bottom: 3px solid var(--primary);
}

.feature-tab:hover {
    background: #f1f5f9;
}

.tab-icon {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.tab-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
}

.feature-content {
    display: none;
}

.feature-content.active {
    display: block;
}

.feature-detail {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.feature-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.feature-header-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(29, 78, 216, 0.1));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-header-icon i {
    font-size: 32px;
    color: var(--primary);
}

.feature-header-text h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 5px;
}

.feature-header-text p {
    color: var(--gray);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.feature-item {
    padding: 25px;
    background: #f8fafc;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.feature-item-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
}

.feature-item-desc {
    color: var(--gray);
    line-height: 1.6;
}

.feature-benefits {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(29, 78, 216, 0.05));
    border-radius: 12px;
    padding: 30px;
}

.benefits-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--dark);
    text-align: center;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
}

.benefit-item {
    text-align: center;
    padding: 20px;
}

.benefit-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 5px;
}

.benefit-label {
    font-size: 0.9rem;
    color: var(--gray);
}

/* 系统优势 */
.system-advantages {
    padding: 100px 5%;
    background: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.advantage-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);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.advantage-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;
}

.advantage-icon i {
    font-size: 36px;
    color: var(--primary);
}

.advantage-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--dark);
}

.advantage-desc {
    color: var(--gray);
    line-height: 1.6;
}

/* 客户案例 */
.client-cases {
    padding: 100px 5%;
    background: #f8fafc;
}

.cases-grid {
    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, 0.08);
    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: 1.5rem;
    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: repeat(2, 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 */
.system-demo {
    padding: 100px 5%;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 100%);
    color: white;
    text-align: center;
}

.demo-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.demo-content {
    max-width: 900px;
    margin: 60px auto 0;
    position: relative;
}

.demo-video {
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.demo-video-placeholder {
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: rgba(0, 0, 0, 0.2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
}

.demo-video-placeholder i {
    font-size: 4rem;
    color: white;
    opacity: 0.8;
}

.demo-cta {
    margin-top: 40px;
}
/* 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;
 }
 
 .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) {
    .overview-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .features-tabs {
        flex-direction: column;
    }
    
    .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;
    }
    
    .overview-stats {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .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;
    }
    
    .advantage-card,
    .case-card,
    .feature-detail {
        padding: 30px;
    }
    
    .feature-header {
        flex-direction: column;
        text-align: center;
    }
}