/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* 标题样式 */
h1, h2, h3, h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

h2 {
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: #3498db;
}

/* 行业概览区 */
.industry-overview {
    padding: 3rem 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-bottom: 1px solid #dee2e6;
}

.industry-stats {
    display: flex;
    gap: 2rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.industry-stats span {
    background: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    font-weight: 500;
}

.industry-desc {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto;
    color: #495057;
}

/* 产业链全景图 */
.industry-chain {
    padding: 3rem 0;
}

.chain-map {
    position: relative;
    margin-top: 2rem;
    border: 1px solid #dee2e6;
    border-radius: 10px;
    overflow: hidden;
    min-height: 300px;
    background: #ffffff;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

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

.chain-nodes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.node {
    position: absolute;
    background: rgba(255,255,255,0.9);
    border: 2px solid #3498db;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.node:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    z-index: 10;
}

.core-node {
    border-color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
}

.support-node {
    border-color: #2980b9;
    background: rgba(41, 128, 185, 0.1);
}

/* 关键技术模块 */
.key-technologies {
    padding: 3rem 0;
    background: #ffffff;
    border-bottom: 1px solid #dee2e6;
}

.tech-cards {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.tech-card {
    flex: 1;
    min-width: 280px;
    background: #ffffff;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border-left: 4px solid #3498db;
}

.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.tech-stats {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.tech-stats span {
    background: #f1f3f5;
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.9rem;
}

/* 高校联动板块 */
.university-linkage {
    padding: 3rem 0;
    background: #f8f9fa;
}

.university-cards {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 2rem;
    justify-content: center;
}

.university-card {
    flex: 1;
    min-width: 280px;
    max-width: 350px;
    background: #ffffff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.university-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.uni-logo {
    width: 100%;
    height: 150px;
    object-fit: contain;
    background: #f8f9fa;
    padding: 1rem;
}

.uni-info {
    padding: 1.5rem;
}

.uni-resources {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.course-link, .lab-link {
    text-decoration: none;
    color: #3498db;
    font-weight: 500;
    transition: all 0.3s ease;
}

.course-link:hover, .lab-link:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* 全周期学习路径 */
.lifecycle-learning {
    padding: 3rem 0;
    background: #ffffff;
}

.learning-path {
    margin-top: 2rem;
}

.path-stage {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
    position: relative;
    padding-left: 3rem;
}

.path-stage::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 100%;
    background: #3498db;
    z-index: 1;
}

.stage-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background: #3498db;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-right: 1.5rem;
    flex-shrink: 0;
    position: relative;
    z-index: 2;
}

.stage-info {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.stage-resources {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* 行业趋势分析 */
.industry-trends {
    padding: 3rem 0;
    background: #f8f9fa;
}

.trend-charts {
    margin-top: 2rem;
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.trend-chart {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 1rem;
}

.trend-analysis {
    line-height: 1.8;
    color: #495057;
}

/* 响应式设计 */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .industry-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .tech-cards,
    .university-cards {
        flex-direction: column;
    }
    
    .path-stage {
        flex-direction: column;
        padding-left: 0;
        text-align: center;
    }
    
    .path-stage::before {
        display: none;
    }
    
    .stage-icon {
        margin-right: 0;
        margin-bottom: 1rem;
    }
}