.seo-guide-section { max-width: 960px; margin: 0 auto; padding: 60px 28px; text-align: left; }
.seo-guide-section h2 { font-size: clamp(26px, 3.5vw, 40px); letter-spacing: -1.5px; margin-bottom: 24px; color: #1e293b; }
.seo-guide-section h3 { font-size: 19px; letter-spacing: -0.5px; margin: 32px 0 12px; color: #334155; }
.seo-guide-section p { font-size: 14.5px; line-height: 1.8; color: #475569; margin-bottom: 16px; }
.seo-guide-section ul { margin: 12px 0 24px 20px; color: #475569; font-size: 14px; line-height: 1.8; }
.seo-guide-section li { margin-bottom: 8px; }

.seo-highlight-box { background: linear-gradient(135deg, #f8fafc, #eef2ff); border: 1px solid #c7d2fe; border-left: 4px solid #6366f1; border-radius: 12px; padding: 22px; margin: 28px 0; }
.seo-highlight-box h4 { margin: 0 0 8px; font-size: 16px; color: #312e81; }
.seo-highlight-box p { margin: 0; font-size: 13.5px; color: #4338ca; line-height: 1.6; }