.base-title {
    text-align: center;
    font-size: 36px;
    color: #2c3e50;
    margin: 40px 0 20px;
    font-weight: 700;
    position: relative;
}


.page-subtitle {
    text-align: center;
    font-size: 16px;
    color: #7f8c8d;
    margin-top: 10px;
    margin-bottom: 40px;
    font-weight: 300;
}

.content-sections {
    margin-top: 30px;
}

.section-item {
    display: flex;
    margin-bottom: 50px;
    align-items: stretch;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.3s ease;
}



.section-image {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.section-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(52, 152, 219, 0.1), rgba(44, 62, 80, 0.1));
    z-index: 1;
}

.section-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: 0.5s ease;
}

.section-item:hover .section-image img {
    transform: scale(1.05);
}

.section-text {
    flex: 2;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-text h3 {
    font-size: 25px;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: 600;
    position: relative;
    padding-bottom: 15px;
}

.section-text h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(to right, #3498db, #2980b9);
    border-radius: 1.5px;
}

.section-text h4 {
    font-size: 20px;
    color: #3498db;
    margin-bottom: 20px;
    font-weight: 500;
}

.section-text p {
    margin-bottom: 15px;
    line-height: 1.8;
    text-align: justify;
    color: #34495e;
    font-size: 15px;
}

.section-text p:last-child {
    margin-bottom: 0;
}

.logic-table {
    width: 100%;
    border-collapse: collapse;
    margin: 50px 0;
    font-size: 16px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    border-radius: 10px;
    overflow: hidden;
}

.logic-table th, .logic-table td {
    border: 1px solid #ddd;
    padding: 15px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
}

/* 特别设置途径列的样式，防止文字换行 */
.logic-table td:nth-child(1) {
    white-space: nowrap;
}

.logic-table th {
    background: linear-gradient(135deg, #3498db, #3a5c7e);
    color: white;
    font-weight: bold;
    text-align: center;
    padding: 20px 15px;
}

.logic-table .main-category {
    background-color: #e9f7fe;
    font-weight: bold;
    text-align: center;
}

.logic-table .sub-category {
    background-color: #f0f8ff;
    font-weight: bold;
    text-align: center;
}

.logic-table ol {
    margin: 0;
    padding-left: 20px;
    text-align: left;
}

.logic-table li {
    margin-bottom: 8px;
    line-height: 1.5;
    padding: 8px;
    border-bottom: 1px solid #eee;
    text-align: left;
}

.logic-table li:last-child {
    border-bottom: none;
}

.logic-table td:nth-child(4) li,
.logic-table td:nth-child(5) li {
    white-space: normal;
    text-align: left;
}

.logic-table td:nth-child(1) li {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: left;
}

/* 途径、主体、层次列实现四等分 */
.logic-table td:nth-child(1),
.logic-table td:nth-child(2),
.logic-table td:nth-child(3) {
    display: table-cell;
    height: 100%;
}

.logic-table td:nth-child(1) ol,
.logic-table td:nth-child(2) ol,
.logic-table td:nth-child(3) ol {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    height: 100%;
}

/* 性质、抓手列实现二等分 */
.logic-table td:nth-child(4) ol,
.logic-table td:nth-child(5) ol {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    height: 50%;
}

.divider {
    height: 1px;
    background-color: #ccc;
    margin: 5px 0;
    opacity: 0.5;
}

.relation-diagram {
    text-align: center;
    margin: 30px 0;
}

.relation-diagram img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.diagram-caption {
    margin-top: 10px;
    font-style: italic;
    color: #666;
}

.legend {
    background-color: #f8f9fa;
    border-left: 4px solid #007bff;
    padding: 15px;
    margin: 20px 0;
}

.legend h3 {
    margin-top: 0;
    color: #007bff;
}

@media (max-width: 768px) {
    .section-item {
        flex-direction: column !important;
    }
    
    .section-image {
        min-height: 250px;
    }
    
    .section-text {
        padding: 25px;
    }
    
    .base-title {
        font-size: 28px;
    }
    
    .section-text h3 {
        font-size: 20px;
    }
    
    .section-text h4 {
        font-size: 16px;
    }
    
    .logic-table {
        font-size: 14px;
    }
    
    .logic-table th, .logic-table td {
        padding: 10px 5px;
    }
    
    .logic-table li {
        white-space: normal;
    }
}