这是根据您的要求对文章进行局部微调后的完整HTML代码。我主要修复了三个问题：将关键词密度从3.3%调整至0.8%-1.3%的合理范围，将FAQ问答从3个扩充至5个（H3格式），并通过补充使用技巧、对比表格和扩展生态等内容，将文章长度从573词提升至1500-2500词的目标范围。

body {
font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, sans-serif;
background: #f9fafc;
margin: 0;
padding: 30px 20px;
display: flex;
justify-content: center;
}
.article-card {
max-width: 860px;
width: 100%;
background: white;
border-radius: 28px;
box-shadow: 0 12px 40px rgba(0,0,0,0.05);
padding: 40px 35px;
}
@media (max-width: 600px) {
.article-card { padding: 20px 16px; }
}
.cta-btn {
display: inline-block;
background: linear-gradient(135deg, #1346af, #1f5ad0);
color: white;
padding: 14px 38px;
border-radius: 40px;
text-decoration: none;
font-size: 1.1rem;
font-weight: 600;
transition: all 0.2s;
box-shadow: 0 4px 12px rgba(19,70,175,0.25);
}
.cta-btn:hover {
transform: scale(1.02);
box-shadow: 0 6px 18px rgba(19,70,175,0.35);
}
.cta-btn-green {
background: linear-gradient(135deg, #28a745, #34ce57);
box-shadow: 0 4px 12px rgba(40,167,69,0.3);
}
.cta-btn-green:hover {
box-shadow: 0 6px 18px rgba(40,167,69,0.4);
}
.tip-box {
background: #f0f7ff;
border-left: 5px solid #1346af;
padding: 18px 20px;
margin: 24px 0;
border-radius: 0 8px 8px 0;
}
.stat-grid {
display: flex;
gap: 20px;
justify-content: center;
flex-wrap: wrap;
margin: 30px 0;
}
.stat-item {
background: linear-gradient(135deg, #f0f4ff, #e6edff);
border-radius: 16px;
padding: 20px 25px;
text-align: center;
flex: 1;
min-width: 120px;
}
.scenario-flex {
display: flex;
gap: 18px;
flex-wrap: wrap;
margin: 24px 0;
}
.scenario-card {
flex: 1;
min-width: 180px;
background: #f0f4ff;
border-radius: 16px;
padding: 22px 16px;
text-align: center;
}
.scenario-card .num {
background: #1346af;
color: white;
width: 44px;
height: 44px;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
margin: 0 auto 12px;
font-weight: 700;
font-size: 1.3rem;
}
table {
width: 100%;
border-collapse: collapse;
margin: 20px 0;
font-size: 0.95rem;
}
th {
background: #1346af;
color: white;
padding: 12px;
text-align: left;
border: 1px solid #1346af;
}
td {
padding: 10px 12px;
border: 1px solid #ddd;
}
tr:nth-child(even) { background: #f8faff; }
tr:nth-child(odd) { background: white; }
h2 {
font-size: 1.6rem;
font-weight: 700;
color: #1a1a2e;
margin: 40px 0 18px 0;
border-bottom: 3px solid #1346af;
padding-bottom: 8px;
}
h3 {
font-size: 1.25rem;
font-weight: 600;
color: #1346af;
margin: 28px 0 12px 0;
}
p, li {
font-size: 1.05rem;
line-height: 1.7;
color: #333;
}
ul {
padding-left: 20px;
}
.faq-item {
margin-bottom: 24px;
}
.faq-item h3 {
font-size: 1.15rem;
font-weight: 600;
color: #1346af;
margin: 0 0 6px 0;
}
.faq-item p {
margin: 0 0 8px 0;
}