/* ============================================================
   龙铭特种作业 · 证书变更页 biangeng.css
   签名 S23：138° 对角渐变分割，内容居左，分裂圆环装饰
   ============================================================ */

.hero{position:relative;min-height:94vh;display:flex;align-items:center;overflow:hidden;background:var(--ink)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.38;transform:scale(1.05)}
.hero-fade{
  position:absolute;inset:0;
  background:linear-gradient(138deg,rgba(11,11,12,.95) 0%,rgba(11,11,12,.78) 42%,rgba(11,11,12,.42) 74%,rgba(11,11,12,.3) 100%);
}
/* 分裂圆环装饰（半圆 + 虚线圆组合） */
.hero-ring{
  position:absolute;right:6%;top:50%;transform:translateY(-50%);width:300px;height:300px;pointer-events:none;opacity:.5;
}
.hero-ring::before{
  content:"";position:absolute;inset:0;border-radius:50%;
  border:1px solid rgba(255,255,255,.3);
  border-left-color:transparent;border-bottom-color:transparent;
}
.hero-ring::after{
  content:"";position:absolute;inset:40px;border-radius:50%;
  border:1px dashed rgba(255,255,255,.22);
}
.hero-inner{position:relative;z-index:2;width:min(1200px,92%);margin-inline:auto;padding:150px 0 90px}
.hero-flag{margin-bottom:22px}
.hero-title{font-size:clamp(34px,5.4vw,64px);line-height:1.16;font-weight:900;margin-bottom:20px}
.hero-title .hl{color:#fff;position:relative;white-space:nowrap}
.hero-title .hl::after{content:"";position:absolute;left:0;right:0;bottom:6px;height:14px;z-index:-1;background:linear-gradient(138deg,rgba(255,255,255,.18),transparent)}
.hero-lead{max-width:560px;font-size:16.5px;color:var(--muted-dark);margin-bottom:32px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- 可变更信息 ---------- */
.what-sec{background:var(--ink)}
.what-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.what-card{padding:34px 30px;border-radius:12px;background:var(--ink-2);border:1px solid var(--line);transition:.35s var(--ease)}
.what-card:hover{transform:translateY(-6px);border-color:rgba(255,255,255,.3)}
.wn-ic{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;color:#fff;background:rgba(255,255,255,.05);margin-bottom:18px}
.what-card h3{font-size:19px;font-weight:800;margin-bottom:10px}
.what-card p{font-size:14px;color:var(--muted-dark);line-height:1.85}

/* ---------- 变更材料（浅底图文） ---------- */
.section-alt{background:var(--ink-2)}
.mat-sec .split{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.mat-sec .split-img img{width:100%;border-radius:14px;aspect-ratio:3/2;object-fit:cover}
.mat-sec .split-txt .t-en{margin-bottom:8px}
.mat-sec .split-txt h2{margin-bottom:18px}
.mat-sec .split-txt p{font-size:15px;color:var(--muted-dark);line-height:1.9;margin-bottom:14px}
.mat-list{margin:0 0 16px;padding:0;display:flex;flex-direction:column;gap:10px}
.mat-list li{font-size:14.5px;color:#d9d9d4;padding-left:20px;position:relative;list-style:none}
.mat-list li::before{content:"";position:absolute;left:0;top:9px;width:9px;height:9px;border:1px solid #fff;border-radius:2px}

/* ---------- 变更流程 ---------- */
.flow-sec{background:var(--ink)}
.flow-track{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.flow-node{padding:30px 24px;border-radius:12px;background:var(--ink-2);border:1px solid var(--line);transition:.35s var(--ease)}
.flow-node:hover{transform:translateY(-5px);border-color:rgba(255,255,255,.3)}
.fn-no{display:block;font-size:13px;font-weight:800;letter-spacing:.2em;color:var(--muted-dark);margin-bottom:18px}
.flow-node h3{font-size:18px;font-weight:800;margin-bottom:8px}
.flow-node p{font-size:14px;color:var(--muted-dark);line-height:1.8}

/* ---------- 单位vs个人 ---------- */
.diff-cols{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.diff-col{padding:34px 30px;border-radius:12px;background:var(--ink);border:1px solid var(--line)}
.diff-col h3{font-size:19px;font-weight:800;margin-bottom:12px}
.diff-col p{font-size:14.5px;color:var(--muted-dark);line-height:1.9}
.diff-note{margin-top:24px;color:var(--muted-dark);font-size:14.5px;line-height:1.9}
.diff-note a{color:var(--paper);border-bottom:1px solid var(--paper)}
.use-note{margin-top:24px;color:var(--muted-dark);font-size:14.5px;line-height:1.9}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:14px;max-width:920px}
.faq-item{background:var(--ink-2);border:1px solid var(--line);border-radius:10px;overflow:hidden;transition:.3s}
.faq-item:hover{border-color:rgba(255,255,255,.28)}
.faq-item summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 24px;font-size:15.5px;font-weight:700;color:#f2f2ee}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;font-weight:300;line-height:1;color:var(--muted-dark);transition:.3s;flex-shrink:0}
.faq-item[open] summary{color:#fff}
.faq-item[open] summary::after{transform:rotate(45deg);color:#fff}
.faq-item p{padding:0 24px 20px;font-size:14.5px;color:var(--muted-dark);line-height:1.9}
.faq-item p a{color:#fff;border-bottom:1px solid rgba(255,255,255,.4)}

/* ---------- 底部 CTA（浅底） ---------- */
.cta-sec{background:var(--paper);color:var(--txt-on-light)}
.cta-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center}
.cta-left .t-en{color:var(--muted-light);margin-bottom:10px}
.cta-left h2{font-size:clamp(24px,3vw,38px);font-weight:900;margin-bottom:14px}
.cta-left p{font-size:15px;color:var(--muted-light);line-height:1.9;max-width:520px}
.cta-left a{color:#000;border-bottom:1px solid #000}
.cta-right{display:flex;flex-direction:column;gap:14px}
.what-note{margin-top:26px;padding:18px 22px;border-left:3px solid var(--paper);background:rgba(244,244,240,.05);border-radius:0 10px 10px 0;color:var(--muted-dark);font-size:15px;line-height:1.9}
.what-note b{color:#fff}

/* ---------- 响应式 ---------- */
@media (max-width:1280px){
  .what-grid{grid-template-columns:1fr}
}
@media (max-width:1024px){
  .mat-sec .split{grid-template-columns:1fr;gap:28px}
  .flow-track{grid-template-columns:1fr 1fr}
  .diff-cols{grid-template-columns:1fr}
  .cta-wrap{grid-template-columns:1fr;gap:24px}
}
@media (max-width:768px){
  .hero-ring{display:none}
  .flow-track{grid-template-columns:1fr}
}