.booklet{max-width:680px;margin:0 auto 72px}
.run{position:sticky;top:64px;z-index:40;background:var(--paper);border-bottom:1px solid var(--gold);padding:8px 16px;display:flex;justify-content:space-between;font-size:11px;letter-spacing:.16em;color:var(--navy)}
.chap{padding:36px 20px 28px;scroll-margin-top:110px;border-bottom:1px solid var(--line)}
.chap h2{font-size:22px;font-weight:400;margin-bottom:8px}
.chap p{color:var(--muted);font-size:15px;font-family:-apple-system,BlinkMacSystemFont,"Microsoft YaHei",sans-serif}
.chap .kpi{display:block;margin-top:10px;color:var(--navy)}
.chap img{width:min(100%,280px);height:140px;object-fit:cover;margin-top:14px;border:1px solid var(--line)}
.book-head{padding:36px 20px 8px;text-align:center}
.book-head h1{font-size:clamp(24px,3.2vw,36px);font-weight:400;margin:8px 0}
.book-head p{color:var(--muted)}