body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: #333;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
    background-color: #f4f7f6;
}
.container {
    background-color: #ffffff;
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}
h1 {
    color: #2c3e50;
    border-bottom: 2px solid #eaecef;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 2.2em;
    text-align: center;
}
h2 {
    color: #34495e;
    margin-top: 2.5rem;
    border-bottom: 1px solid #eaecef;
    padding-bottom: 0.5rem;
}
h3 {
    color: #44596e;
    margin-top: 1.5rem;
    font-size: 1.2em;
}
p {
    margin-bottom: 1.2rem;
    font-size: 1.05em;
}
ul {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}
li {
    margin-bottom: 0.6rem;
    font-size: 1.05em;
}
strong {
    color: #e74c3c;
    font-weight: 600;
}
.summary {
    background-color: #f0f7ff;
    border-left: 5px solid #3498db;
    padding: 1.5rem;
    margin-top: 3rem;
    border-radius: 0 8px 8px 0;
}
.summary h2 {
    margin-top: 0;
    border-bottom: none;
    color: #2980b9;
}
.summary p:last-child {
    margin-bottom: 0;
}
.diagrams {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin: 2.5rem 0;
}
.diagram-card {
    background: #ffffff;
    border: 1px solid #eaecef;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s ease;
}
.diagram-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}
.diagram-img {
    width: 400px;
    height: 320px;
    display: block;
}

/* 文本高亮样式 */
.common-point {
    color: #1e7e34; /* 深绿色 */
}
.diff-point {
    color: #d32f2f; /* 红色 */
}
.emph-text {
    color: #00008b; /* 深蓝色 */
    font-weight: bold; /* 粗体 */
}