/* ============================================================
   开封建站 kaifeng.css —— 壹捌玖网络科技
   布局：居中 Hero / 行业方案三图文卡 / 编号交替优势行 /
   两张宽案例卡 / 手风琴 / CTA+区域互链
   ============================================================ */

/* ---------- 1. Hero（居中） ---------- */
.hero{
  position:relative;min-height:86vh;display:flex;align-items:center;
  overflow:hidden;background:var(--ink);
}
.hero-bg{background-position:center 30%}
.hero-veil{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(0deg,rgba(20,20,20,.85) 0%,rgba(20,20,20,.45) 55%,rgba(20,20,20,.35) 100%);
}
.hero-inner{position:relative;z-index:3;padding-top:130px;padding-bottom:90px;text-align:center;max-width:860px;margin:0 auto}
.crumb{display:inline-flex;align-items:center;gap:10px;color:#C9C0AF;font-size:13px;margin-bottom:26px;opacity:0;animation:fadeUp .6s .1s ease forwards}
.crumb a{color:#EDE6DA}
.crumb a:hover{color:var(--coffee-bright)}
.crumb em{color:var(--coffee-bright);font-style:normal;font-weight:700}
.hero-title{color:#fff;font-size:clamp(36px,5.4vw,62px);font-weight:900;line-height:1.14;letter-spacing:-.02em;margin-bottom:22px}
.ht-line{display:block;overflow:hidden;opacity:0}
.ht-line:nth-child(1){animation:slideUp .75s .22s cubic-bezier(.22,.68,.4,1) forwards}
.ht-line:nth-child(2){animation:slideUp .75s .4s cubic-bezier(.22,.68,.4,1) forwards}
.ht-gold{color:var(--coffee)}
.hero-sub{color:#D8CFBF;font-size:clamp(15px,1.7vw,18px);line-height:1.9;margin:0 auto 34px;max-width:640px;opacity:0;animation:fadeUp .7s .55s ease forwards}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;opacity:0;animation:fadeUp .7s .7s ease forwards}
@keyframes slideUp{from{opacity:0;transform:translateY(44px)}to{opacity:1;transform:none}}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
.scroll-hint{position:absolute;left:50%;bottom:24px;transform:translateX(-50%);width:26px;height:44px;border:2px solid rgba(255,255,255,.4);border-radius:14px;z-index:4;display:flex;justify-content:center;padding-top:8px}
.scroll-hint span{width:3px;height:9px;border-radius:3px;background:#fff;animation:hintDrop 1.8s ease infinite}
@keyframes hintDrop{0%{opacity:0;transform:translateY(0)}35%{opacity:1}100%{opacity:0;transform:translateY(14px)}}
@media (max-width:640px){
  .hero{min-height:auto;padding-bottom:40px}
  .hero-cta .btn{width:100%}
  .scroll-hint{display:none}
}

/* ---------- 2. 特色行业方案 ---------- */
.ind{background:#fff}
.ik-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.ik-card{
  display:block;background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;
  transition:all .45s;
}
.ik-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:var(--coffee)}
.ik-card img{width:100%;height:210px;object-fit:cover;transition:transform .6s}
.ik-card:hover img{transform:scale(1.05)}
.ik-body{padding:22px 24px 26px}
.ik-body h3{font-size:18px;margin-bottom:8px;color:var(--ink)}
.ik-body p{font-size:13.5px;color:var(--text-2);line-height:1.85;margin-bottom:12px}
.ik-body span{font-size:13px;font-weight:800;color:var(--coffee-deep)}
@media (max-width:1024px){.ik-grid{grid-template-columns:1fr}}

/* ---------- 3. 优势编号交替 ---------- */
.why{background:var(--coffee-bg)}
.wy-list{display:grid;gap:26px;margin-top:40px;max-width:920px}
.wy-row{
  display:grid;grid-template-columns:120px 1fr;gap:24px;align-items:center;
  background:#fff;border-radius:18px;padding:30px 32px;box-shadow:var(--shadow-sm);
}
.wy-row b{
  font-size:52px;font-weight:900;line-height:1;
  background:var(--grad-coffee);-webkit-background-clip:text;background-clip:text;color:transparent;
  font-variant-numeric:tabular-nums;
}
.wy-row h3{font-size:19px;margin-bottom:8px}
.wy-row p{font-size:14px;color:var(--text-2);line-height:1.9}
@media (max-width:640px){.wy-row{grid-template-columns:1fr;gap:8px}}

/* ---------- 4. 宽案例卡 ---------- */
.cases{background:#fff}
.kf-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:40px}
.kf-card{
  display:block;border-radius:20px;overflow:hidden;background:var(--ink);
  box-shadow:var(--shadow-sm);transition:all .45s;
}
.kf-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.kf-card img{width:100%;height:230px;object-fit:cover;opacity:.92;transition:transform .6s}
.kf-card:hover img{transform:scale(1.05)}
.kf-body{padding:24px 26px 28px}
.kf-tag{
  display:inline-block;font-size:12px;font-weight:800;color:var(--coffee-bright);
  border:1px solid rgba(223,198,155,.5);border-radius:100px;padding:3px 12px;margin-bottom:12px;
}
.kf-body h3{color:#fff;font-size:19px;margin-bottom:8px}
.kf-body p{font-size:13.5px;color:#C9C0AF;line-height:1.8}
@media (max-width:900px){.kf-grid{grid-template-columns:1fr}}

/* ---------- 5. FAQ ---------- */
.faqs{background:var(--coffee-bg)}
.faq-wrap{max-width:860px}
.acc{border-top:2px solid var(--ink)}
.acc-item{border-bottom:1px solid var(--line)}
.acc-head{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:22px 6px;text-align:left;font-size:16.5px;font-weight:800;color:var(--ink);background:none;transition:color .3s;
}
.acc-head:hover{color:var(--coffee-deep)}
.acc-ico{
  flex-shrink:0;width:32px;height:32px;border-radius:50%;border:1.5px solid var(--line);
  font-size:20px;font-weight:400;color:var(--coffee-deep);
  display:flex;align-items:center;justify-content:center;transition:all .35s;
}
.acc-item.open .acc-ico{background:var(--grad-coffee);border-color:transparent;color:#fff;transform:rotate(45deg)}
.acc-item.open .acc-head{color:var(--coffee-deep)}
.acc-panel{max-height:0;overflow:hidden;transition:max-height .45s cubic-bezier(.22,.68,.4,1)}
.acc-panel p{padding:4px 4px 22px;font-size:14.5px;color:var(--text-2);line-height:1.95;max-width:720px}
.acc-panel a{color:var(--coffee-deep);font-weight:700}

/* ---------- 6. CTA ---------- */
.cta{position:relative;overflow:hidden;background:var(--ink);padding:120px 0}
.cta-bg{background-position:center 40%}
.cta-veil{position:absolute;inset:0;background:rgba(20,20,20,.8);z-index:1}
.cta-inner{position:relative;z-index:2;text-align:center}
.cta-title{color:#fff;font-size:clamp(26px,4vw,40px);font-weight:900;margin-bottom:18px}
.cta-sub{color:#D8CFBF;font-size:16px;margin-bottom:38px}
.cta-row{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:36px}
.region-links{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.region-links a{
  padding:9px 22px;border-radius:100px;font-size:13px;font-weight:700;
  border:1px solid rgba(255,255,255,.3);color:#EDE6DA;transition:all .3s;
}
.region-links a:hover{border-color:var(--coffee);color:var(--coffee-bright)}
.region-links a.on{background:var(--grad-coffee);border-color:transparent;color:#fff}
@media (max-width:640px){.cta-row .btn{width:100%}}