Fix CTA contrast and clarify audience reach copy

app/page.tsx

@@ -33,7 +33,7 @@ export default function Home() {
       <div className="service-grid">{services.map(([no,title,text])=><article key={no}><span>{no}</span><div/><h3>{title}</h3><p>{text}</p></article>)}</div>
     </section>
 
-    <section className="section dark"><div className="shell"><div className="split light"><div><p className="kicker">PARTNERSHIP VALUE</p><h2>从“做更多内容”，<br/>到“经营更多价值”。</h2></div><Link className="btn pale" href="/advantages">了解合作优势 <b>→</b></Link></div><div className="flow">{[["01","内容被看见","扩大触达"],["02","互动被回应","建立关系"],["03","信任被沉淀","形成资产"],["04","影响力变现","持续增长"]].map((x,i)=><article className={i===3?"hot":""} key={x[0]}><span>{x[0]}</span><strong>{x[1]}</strong><small>{x[2]}</small></article>)}</div></div></section>
+    <section className="section dark"><div className="shell"><div className="split light"><div><p className="kicker">PARTNERSHIP VALUE</p><h2>从“做更多内容”，<br/>到“经营更多价值”。</h2></div><Link className="btn pale" href="/advantages">了解合作优势 <b>→</b></Link></div><div className="flow">{[["01","持续触达粉丝","扩大内容覆盖"],["02","互动被回应","建立关系"],["03","信任被沉淀","形成资产"],["04","影响力变现","持续增长"]].map((x,i)=><article className={i===3?"hot":""} key={x[0]}><span>{x[0]}</span><strong>{x[1]}</strong><small>{x[2]}</small></article>)}</div></div></section>
 
     <section className="section shell">
       <div className="title-row"><div><p className="kicker">USE CASES</p><h2>适配不同阶段的合作方式</h2></div><Link className="link" href="/cases">查看全部案例 <b>→</b></Link></div>