/* CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 107, 53, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #333;
    border: 2px solid #333;
}

.btn-secondary:hover {
    background: #333;
    color: white;
}

.btn-full {
    width: 100%;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #ff6b35;
    font-size: 24px;
    margin-bottom: 2px;
}

.nav-logo span {
    font-size: 12px;
    color: #666;
    font-weight: 300;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #ff6b35;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background: #ff6b35;
    transition: all 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
    left: 0;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero区域 */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    padding-top: 70px;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    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="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #fff, #f0f0f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    font-weight: 300;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

/* 热交换动画 */
.heat-exchange-animation {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.hot-flow, .cold-flow {
    width: 200px;
    height: 60px;
    border-radius: 30px;
    position: relative;
    overflow: hidden;
}

.hot-flow {
    background: linear-gradient(90deg, #ff6b35, #f7931e);
}

.cold-flow {
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.heat-exchanger {
    width: 150px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    position: relative;
}

/* 技术原理部分 */
.technology {
    padding: 100px 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: #333;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 60px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 80px;
}

.tech-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e9ecef;
}

.tech-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.tech-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.tech-card p {
    color: #666;
    margin-bottom: 20px;
}

.tech-features {
    list-style: none;
    text-align: left;
}

.tech-features li {
    padding: 8px 0;
    border-bottom: 1px solid #e9ecef;
    position: relative;
    padding-left: 20px;
}

.tech-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

/* 工艺流程 */
.tech-process {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px 40px;
    border-radius: 20px;
    color: white;
}

.tech-process h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
}

.process-flow {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.process-step {
    text-align: center;
    flex: 1;
}

.step-number {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 20px;
}

.process-step h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.process-step p {
    opacity: 0.9;
}

.process-arrow {
    font-size: 2rem;
    margin: 30px 20px 0;
    opacity: 0.7;
}

/* 应用领域 */
.applications {
    padding: 100px 0;
    background: #f8f9fa;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 35px;
}

.application-item {
    background: white;
    padding: 35px 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.application-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.app-header {
    display: flex;
    align-items: center;
    margin-bottom: 22px;
    gap: 15px;
}

.app-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.application-item h3 {
    font-size: 1.5rem;
    margin: 0;
    color: #2c3e50;
    font-weight: 600;
}

.app-summary {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
    font-size: 0.95rem;
    flex-grow: 0;
}

.app-details {
    margin-bottom: 25px;
    text-align: left;
}

.app-details h4 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 10px;
    font-weight: 600;
}

.app-details ul {
    margin: 10px 0;
    padding-left: 20px;
}

.app-details ul li {
    margin-bottom: 5px;
    color: #555;
    font-size: 0.9rem;
    line-height: 1.4;
}

.app-details p {
    color: #555;
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 10px 0 0;
}

.app-benefits {
    display: flex;
    justify-content: flex-start;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: auto;
}

.benefit-tag {
    background: #e9ecef;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: #495057;
}

/* 应用场景详细说明 */
.app-details {
    margin: 15px 0;
    padding: 15px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    border-left: 4px solid #ff6b35;
}

.app-details h4 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1rem;
}

.app-details ul {
    list-style: none;
    margin: 10px 0;
}

.app-details ul li {
    padding: 5px 0;
    position: relative;
    padding-left: 20px;
}

.app-details ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #ff6b35;
    font-weight: bold;
}

.app-details p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.4;
    margin-top: 10px;
}

/* 应用场景详细说明 */
.app-details {
    margin: 15px 0;
    padding: 15px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    border-left: 4px solid #ff6b35;
}

.app-details h4 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1rem;
}

.app-details ul {
    list-style: none;
    margin: 10px 0;
}

.app-details ul li {
    padding: 5px 0;
    position: relative;
    padding-left: 20px;
}

.app-details ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #ff6b35;
    font-weight: bold;
}

.app-details p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.4;
    margin-top: 10px;
}

/* 成功案例 */
.cases {
    padding: 100px 0;
    background: white;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.case-card {
    background: #f8f9fa;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.case-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.case-header h3 {
    font-size: 1.3rem;
}

.case-year {
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 0.9rem;
}

.case-content {
    padding: 30px;
}

.case-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}

.case-stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #ff6b35;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

.case-description {
    color: #666;
    line-height: 1.6;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    gap: 15px;
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-form {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.contact-form h3 {
    font-size: 1.8rem;
    margin-bottom: 30px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    background: white;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: #ff6b35;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #ff6b35;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    color: #999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 20px;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .process-flow {
        flex-direction: column;
        gap: 30px;
    }
    
    .process-arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .tech-grid,
    .applications-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 加载动画 */
@keyframes flow {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.hot-flow::before,
.cold-flow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: flow 2s infinite;
}

/* 表单验证样式 */
.form-group input:invalid,
.form-group select:invalid {
    border: 2px solid #ff6b6b;
}

.form-group input:valid,
.form-group select:valid {
    border: 2px solid #51cf66;
}

/* 技术参数对比表格样式 */
.tech-comparison {
    margin: 80px 0;
}

.tech-comparison h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: #333;
}

.comparison-table {
    overflow-x: auto;
    margin: 0 auto;
    max-width: 100%;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    min-width: 800px;
}

.comparison-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: left;
    font-weight: 600;
    font-size: 1rem;
}

.comparison-table td {
    padding: 15px;
    border-bottom: 1px solid #e9ecef;
    color: #555;
}

.comparison-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

.comparison-table tr:hover {
    background-color: #e9ecef;
}

.comparison-table td:first-child {
    font-weight: 600;
    color: #333;
}

/* 响应式表格 */
@media (max-width: 768px) {
    .comparison-table {
        margin: 0 -20px;
        padding: 0 20px;
    }
    
    .comparison-table table {
        font-size: 0.9rem;
        min-width: 600px;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 12px 10px;
    }
}

/* 经济效益分析模块 */
.benefits {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.benefit-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
}

.benefit-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.benefit-stats {
    margin-bottom: 20px;
}

.benefit-stat {
    text-align: center;
}

.benefit-stat .stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ff6b35;
    margin-bottom: 5px;
}

.benefit-stat .stat-label {
    font-size: 1rem;
    color: #666;
}

.benefit-card p {
    color: #666;
    line-height: 1.6;
}

.roi-calculation {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.roi-calculation h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: #333;
}

.roi-table {
    overflow-x: auto;
}

.roi-table table {
    width: 100%;
    border-collapse: collapse;
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
}

.roi-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
}

.roi-table td {
    padding: 15px;
    border-bottom: 1px solid #e9ecef;
    color: #555;
    text-align: center;
}

.roi-table tr:nth-child(even) {
    background-color: white;
}

.roi-table tr:hover {
    background-color: #e9ecef;
}

/* 经济效益分析模块 */
.benefits {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.benefit-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
}

.benefit-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.benefit-stats {
    margin-bottom: 20px;
}

.benefit-stat {
    text-align: center;
}

.benefit-stat .stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ff6b35;
    margin-bottom: 5px;
}

.benefit-stat .stat-label {
    font-size: 1rem;
    color: #666;
}

.benefit-card p {
    color: #666;
    line-height: 1.6;
}

.roi-calculation {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.roi-calculation h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: #333;
}

.roi-table {
    overflow-x: auto;
}

.roi-table table {
    width: 100%;
    border-collapse: collapse;
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
}

.roi-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
}

.roi-table td {
    padding: 15px;
    border-bottom: 1px solid #e9ecef;
    color: #555;
    text-align: center;
}

.roi-table tr:nth-child(even) {
    background-color: white;
}

.roi-table tr:hover {
    background-color: #e9ecef;
}

/* 技术参数对比表格样式 */
.tech-comparison {
    margin: 80px 0;
}

.tech-comparison h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: #333;
}

.comparison-table {
    overflow-x: auto;
    margin: 0 auto;
    max-width: 100%;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    min-width: 800px;
}

.comparison-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: left;
    font-weight: 600;
    font-size: 1rem;
}

.comparison-table td {
    padding: 15px;
    border-bottom: 1px solid #e9ecef;
    color: #555;
}

.comparison-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

.comparison-table tr:hover {
    background-color: #e9ecef;
}

.comparison-table td:first-child {
    font-weight: 600;
    color: #333;
}

/* 响应式表格 */
@media (max-width: 768px) {
    .comparison-table {
        margin: 0 -20px;
        padding: 0 20px;
    }
    
    .comparison-table table {
        font-size: 0.9rem;
        min-width: 600px;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 12px 10px;
    }
}

/* 经济效益分析模块 */
.benefits {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.benefit-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
}

.benefit-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.benefit-stats {
    margin-bottom: 20px;
}

.benefit-stat {
    text-align: center;
}

.benefit-stat .stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ff6b35;
    margin-bottom: 5px;
}

.benefit-stat .stat-label {
    font-size: 1rem;
    color: #666;
}

.benefit-card p {
    color: #666;
    line-height: 1.6;
}

.roi-calculation {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.roi-calculation h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: #333;
}

.roi-table {
    overflow-x: auto;
}

.roi-table table {
    width: 100%;
    border-collapse: collapse;
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
}

.roi-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
}

.roi-table td {
    padding: 15px;
    border-bottom: 1px solid #e9ecef;
    color: #555;
    text-align: center;
}

.roi-table tr:nth-child(even) {
    background-color: white;
}

.roi-table tr:hover {
    background-color: #e9ecef;
}

/* 经济效益分析模块 */
.benefits {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.benefit-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
}

.benefit-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.benefit-stats {
    margin-bottom: 20px;
}

.benefit-stat {
    text-align: center;
}

.benefit-stat .stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ff6b35;
    margin-bottom: 5px;
}

.benefit-stat .stat-label {
    font-size: 1rem;
    color: #666;
}

.benefit-card p {
    color: #666;
    line-height: 1.6;
}

.roi-calculation {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.roi-calculation h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: #333;
}

.roi-table {
    overflow-x: auto;
}

.roi-table table {
    width: 100%;
    border-collapse: collapse;
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
}

.roi-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
}

.roi-table td {
    padding: 15px;
    border-bottom: 1px solid #e9ecef;
    color: #555;
    text-align: center;
}

.roi-table tr:nth-child(even) {
    background-color: white;
}

.roi-table tr:hover {
    background-color: #e9ecef;
}