/* ============================================================
   solution-building.css — 建材行业方案页
   左图右文痛点行 + 规格表样板 + 深色三栏做法 + 案例三卡 + CTA
   ============================================================ */

/* ---------- 痛点：左图右文行 ---------- */
.sbld-pain{background:var(--white)}
.sbld-rows{display:flex;flex-direction:column;gap:26px;max-width:1040px;margin:0 auto}
.sbld-row{
  display:grid;grid-template-columns:300px 1fr;gap:32px;align-items:center;
  background:var(--mist);border:1px solid var(--line);border-radius:16px;
  padding:18px;transition:all .35s ease;
}
.sbld-row:hover{transform:translateX(8px);box-shadow:var(--shadow-soft);border-color:var(--gold-2)}
.sbld-row figure{overflow:hidden;border-radius:12px}
.sbld-row img{width:100%;height:170px;object-fit:cover;transition:transform .6s ease}
.sbld-row:hover img{transform:scale(1.05)}
.sbld-row-tag{
  display:inline-block;font-size:12px;letter-spacing:2px;color:#fff;
  background:linear-gradient(135deg,var(--gold-2),var(--gold-3));
  padding:3px 12px;border-radius:20px;margin-bottom:12px;
}
.sbld-row h3{font-size:19px;margin-bottom:10px;line-height:1.5}
.sbld-row p{font-size:14px;line-height:1.95;color:var(--gray)}

/* ---------- 规格表样板 ---------- */
.sbld-spec-wrap{
  display:grid;grid-template-columns:1.3fr .7fr;gap:28px;align-items:stretch;
}
.sbld-spec-wrap table{
  width:100%;border-collapse:collapse;background:var(--white);
  border:1px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow-soft);
}
.sbld-spec-wrap caption{
  text-align:left;font-family:var(--font-serif);font-size:17px;
  padding:20px 22px 6px;color:var(--ink);
}
.sbld-spec-wrap th,.sbld-spec-wrap td{
  padding:13px 16px;font-size:13.5px;text-align:left;
  border-bottom:1px solid var(--line);
}
.sbld-spec-wrap thead th{
  background:var(--ink);color:var(--gold-2);font-weight:600;letter-spacing:1px;
}
.sbld-spec-wrap tbody tr:hover td{background:var(--mist)}
.sbld-spec-side{
  background:var(--white);border:1px solid var(--line);border-radius:14px;
  padding:26px;box-shadow:var(--shadow-soft);
  border-top:3px solid var(--gold);
}
.sbld-spec-side h3{font-size:18px;margin-bottom:14px}
.sbld-spec-side p{font-size:13.5px;line-height:1.9;color:var(--gray);margin-bottom:8px}
.sbld-spec-side p b{color:var(--gold-3)}
.sbld-spec-side .btn{margin-top:10px}

/* ---------- 深色三栏做法 ---------- */
.sbld-how{position:relative;overflow:hidden}
.sbld-how-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sbld-how-item{
  padding:32px 28px;border:1px solid rgba(217,190,133,.2);border-radius:14px;
  background:rgba(255,255,255,.03);transition:all .35s ease;
}
.sbld-how-item:hover{border-color:var(--gold-2);background:rgba(217,190,133,.07);transform:translateY(-5px)}
.sbld-how-item h3{color:#fff;font-size:19px;margin-bottom:12px}
.sbld-how-item p{font-size:14px;line-height:1.95;color:#B7B3A8}
.sbld-how-item a{color:var(--gold-2);border-bottom:1px dashed var(--gold-2)}

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

/* ---------- CTA ---------- */
.sbld-cta{
  background:linear-gradient(160deg,#26292F,#1B1E23 70%);
  padding:90px 0;position:relative;overflow:hidden;
}
.sbld-cta::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(520px 300px at 85% 25%,rgba(217,190,133,.15),transparent 60%);
}
.sbld-cta-inner{position:relative;max-width:820px}
.sbld-cta h2{color:#fff;font-size:32px;margin-bottom:18px}
.sbld-cta p{color:#C6C2B4;font-size:15px;line-height:2}
.sbld-cta a{color:var(--gold-2);border-bottom:1px dashed var(--gold-2)}
.sbld-cta-actions{display:flex;flex-wrap:wrap;gap:16px;margin:28px 0 14px}
.sbld-cta .btn-line{color:#E9E3CD;border-color:rgba(217,190,133,.45)}
.sbld-cta .btn-line:hover{border-color:var(--gold-2);color:#fff;background:rgba(217,190,133,.12)}
.sbld-cta-note{font-size:13.5px;color:#9A968C}

/* ---------- 响应式 ---------- */
@media (max-width:992px){
  .sbld-row{grid-template-columns:1fr;gap:18px}
  .sbld-row img{height:200px}
  .sbld-spec-wrap{grid-template-columns:1fr}
  .sbld-how-cols{grid-template-columns:1fr;gap:18px}
  .sbld-case-row{grid-template-columns:1fr;gap:18px}
}
@media (max-width:640px){
  .sbld-cta h2{font-size:24px}
  .sbld-spec-wrap th,.sbld-spec-wrap td{padding:10px 10px;font-size:12.5px}
}