/* 下载页 · 转化阶梯 */
.ladder-intro{padding:2rem 0;background:#e8f4fc;border-bottom:3px solid #f97316}
.ladder-intro h1{font-size:clamp(1.35rem,3.5vw,1.85rem);font-weight:900;color:#0f172a;margin-bottom:.45rem}
.ladder-intro p{color:#64748b;max-width:580px;font-size:.92rem}

.ladder-section{padding:2.5rem 0 3rem;background:#fff}
.ladder-wrap{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:0}
.ladder-rung{display:grid;grid-template-columns:48px 1fr auto;gap:1.25rem;align-items:center;padding:1.25rem 0;border-bottom:2px solid #e8f4fc;position:relative}
.ladder-rung::before{content:"";position:absolute;left:23px;top:0;bottom:0;width:2px;background:#0284c7;z-index:0}
.ladder-rung:last-child::before{display:none}
.rung-node{width:48px;height:48px;background:#f97316;color:#fff;font-weight:900;font-size:1rem;display:flex;align-items:center;justify-content:center;border-radius:4px;position:relative;z-index:1;flex-shrink:0}
.rung-node.ice{background:#0284c7}
.rung-body h2{font-size:1.02rem;margin-bottom:.25rem;font-weight:800;color:#0f172a}
.rung-body p{font-size:.84rem;color:#64748b}
.rung-body img{margin-top:.65rem;border:2px solid #bae6fd;border-radius:6px;max-width:200px}
.btn-rung{display:inline-block;background:#f97316;color:#fff!important;padding:.55rem 1.15rem;font-weight:800;font-size:.82rem;border-radius:4px;text-decoration:none!important;white-space:nowrap}
.btn-rung:hover{background:#ea580c}
.ladder-rung.featured{background:#f0f9ff;margin:0 -1rem;padding-left:1rem;padding-right:1rem;border-radius:8px;border-bottom:none;margin-bottom:.5rem}

.ladder-stats{padding:2rem 0;background:#0284c7;color:#fff;text-align:center}
.ladder-stats-row{display:flex;justify-content:center;gap:2.5rem;flex-wrap:wrap}
.ladder-stats-row strong{display:block;font-size:1.3rem;color:#f97316;font-weight:900}
.ladder-stats-row span{font-size:.78rem;opacity:.9}

.ladder-faq{padding:2.5rem 0;background:#e8f4fc}
.faq-list{max-width:720px;margin:0 auto}
.faq-item{border:1px solid #bae6fd;margin-bottom:.4rem;background:#fff;border-radius:6px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:#f0f9ff;border:none;padding:1rem 1.15rem;font-size:.92rem;font-weight:700;cursor:pointer;display:flex;justify-content:space-between;color:#0f172a;font-family:inherit}
.faq-item.open .faq-q{border-left:4px solid #f97316}
.faq-q::after{content:"+";color:#f97316}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 1.15rem 1rem;font-size:.88rem;color:#64748b}
.faq-item.open .faq-a{display:block}

@media(max-width:640px){
  .ladder-rung{grid-template-columns:1fr;text-align:center}
  .ladder-rung::before{display:none}
  .rung-node{margin:0 auto}
}