/* ============================================================
   solution-energy.css — 新能源行业方案页
   原生 details 问答 + 深色五块 + 左图右文做法 + 三卡案例 + 通栏 CTA
   ============================================================ */

/* ---------- 痛点：问答 + 图 ---------- */
.seng-pain{background:var(--white)}
.seng-pain-cols{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.seng-pain-list{display:flex;flex-direction:column;gap:14px}
.seng-q{
  background:var(--mist);border:1px solid var(--line);border-radius:12px;
  overflow:hidden;transition:border-color .3s ease;
}
.seng-q[open]{border-color:var(--gold-2)}
.seng-q summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  padding:18px 22px;font-family:var(--font-serif);font-size:17px;color:var(--ink);
}
.seng-q summary::-webkit-details-marker{display:none}
.seng-q-mark{
  flex:none;width:10px;height:10px;margin-left:16px;
  border-right:2px solid var(--gold-3);border-bottom:2px solid var(--gold-3);
  transform:rotate(45deg);transition:transform .3s ease;
}
.seng-q[open] .seng-q-mark{transform:rotate(225deg)}
.seng-q p{padding:0 22px 18px;font-size:13.5px;line-height:1.95;color:var(--gray)}
.seng-pain-media img{border-radius:16px;box-shadow:var(--shadow)}
.seng-pain-media figcaption{
  margin-top:14px;font-size:12.5px;color:var(--gray);letter-spacing:1px;
  padding-left:14px;border-left:2px solid var(--gold);
}

/* ---------- 深色五块结构 ---------- */
.seng-structure{position:relative;overflow:hidden}
.seng-blocks{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.seng-block{
  grid-column:span 2;padding:28px 24px;
  background:rgba(255,255,255,.03);border:1px solid rgba(217,190,133,.2);border-radius:12px;
  transition:all .35s ease;
}
.seng-block:nth-child(4),.seng-block:nth-child(5){grid-column:span 3}
.seng-block:hover{border-color:var(--gold-2);background:rgba(217,190,133,.07);transform:translateY(-5px)}
.seng-block h3{color:#fff;font-size:17px;margin-bottom:10px}
.seng-block p{font-size:13px;line-height:1.9;color:#B7B3A8}

/* ---------- 做法：左图右文 ---------- */
.seng-how-inner{display:grid;grid-template-columns:.95fr 1.05fr;gap:60px;align-items:center}
.seng-how-media img{border-radius:16px;box-shadow:var(--shadow)}
.seng-how-item{padding:16px 0;border-bottom:1px solid var(--line)}
.seng-how-item:last-child{border-bottom:0}
.seng-how-item h3{font-size:18px;margin-bottom:8px}
.seng-how-item p{font-size:14px;line-height:1.95;color:var(--gray)}
.seng-how-item a{color:var(--gold-3);font-weight:600;border-bottom:1px dashed var(--gold)}

/* ---------- 案例三卡 ---------- */
.seng-cases{background:var(--white)}
.seng-case-row{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.seng-case{
  display:block;border:1px solid var(--line);border-radius:14px;overflow:hidden;
  background:var(--mist);transition:all .35s ease;
}
.seng-case:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--gold-2)}
.seng-case img{width:100%;height:180px;object-fit:cover}
.seng-case div{padding:20px 22px 22px}
.seng-case span{
  display:inline-block;font-size:11.5px;letter-spacing:2px;color:var(--gold-3);
  border:1px solid var(--gold);padding:2px 10px;border-radius:20px;margin-bottom:10px;
}
.seng-case h3{font-size:16.5px;line-height:1.6;margin-bottom:8px}
.seng-case p{font-size:13px;color:var(--gray);line-height:1.85}

/* ---------- CTA ---------- */
.seng-cta{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,#26292F,#1B1E23 70%);
  color:#E9E6DE;padding:90px 0;
}
.seng-cta::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(560px 300px at 85% 20%,rgba(217,190,133,.16),transparent 60%);
}
.seng-cta-inner{position:relative;max-width:820px}
.seng-cta h2{color:#fff;font-size:32px;margin-bottom:18px}
.seng-cta p{color:#C6C2B4;font-size:15px;line-height:2}
.seng-cta a{color:var(--gold-2);border-bottom:1px dashed var(--gold-2)}
.seng-cta-actions{display:flex;flex-wrap:wrap;gap:16px;margin:28px 0 14px}
.seng-cta .btn-line{color:#E9E3CD;border-color:rgba(217,190,133,.45)}
.seng-cta .btn-line:hover{border-color:var(--gold-2);color:#fff;background:rgba(217,190,133,.12)}
.seng-cta-note{font-size:13.5px;color:#9A968C}

/* ---------- 响应式 ---------- */
@media (max-width:992px){
  .seng-pain-cols{grid-template-columns:1fr;gap:36px}
  .seng-blocks{grid-template-columns:1fr}
  .seng-block,.seng-block:nth-child(4),.seng-block:nth-child(5){grid-column:auto}
  .seng-how-inner{grid-template-columns:1fr;gap:36px}
  .seng-case-row{grid-template-columns:1fr;gap:18px}
}
@media (max-width:640px){
  .seng-cta h2{font-size:24px}
}