/* ============================================================
   service-seo.css — SEO优化推广详情页
   布局：左文右悬浮排名卡 Hero / 左图右文定义 / 深色纵向编号步骤 /
   双案例图卡 / 浅咖 FAQ 手风琴 / 视差 CTA
   ============================================================ */

/* ---------- 1. Hero（左文 + 右侧悬浮排名卡） ---------- */
.seo-hero{
  min-height:92vh;display:flex;align-items:center;
  position:relative;overflow:hidden;
  background:var(--ink);color:#fff;padding:150px 0 90px;
}
.seo-hero-bg{z-index:0}
.seo-hero-veil{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(100deg,rgba(16,15,13,.92) 0%,rgba(16,15,13,.72) 48%,rgba(16,15,13,.35) 100%);
}
.seo-hero-inner{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.35fr .65fr;gap:48px;align-items:center;
}
.seo-crumb{font-size:13px;color:#CFC7B8;margin-bottom:26px;font-weight:600}
.seo-crumb a{color:#CFC7B8;transition:color .3s}
.seo-crumb a:hover{color:var(--coffee-bright)}
.seo-crumb em{font-style:normal;color:var(--coffee-bright)}
.seo-hero-title{
  font-size:clamp(34px,5.2vw,64px);font-weight:900;line-height:1.18;color:#fff;
  margin-bottom:22px;letter-spacing:-.01em;
}
.seo-ht-line{display:block}
.seo-gold{
  background:linear-gradient(120deg,#E8CD9D,#C9A87C);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.seo-hero-sub{font-size:17px;color:#D8D0C2;line-height:1.9;margin-bottom:36px;max-width:560px}
.seo-hero-cta{display:flex;gap:16px;flex-wrap:wrap}

/* 右侧悬浮排名卡 */
.seo-rank-card{
  background:rgba(255,255,255,.07);backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.16);border-radius:24px;
  padding:30px 32px;box-shadow:0 24px 60px rgba(0,0,0,.35);
}
.src-row{display:flex;align-items:baseline;gap:12px;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.1)}
.src-row:last-child{border-bottom:none}
.src-row b{
  font-size:38px;font-weight:900;color:var(--coffee-bright);
  font-variant-numeric:tabular-nums;line-height:1;
}
.src-row span{font-size:14px;color:#D8D0C2;line-height:1.5}

/* ---------- 2. 服务定义（左图右文） ---------- */
.seo-intro{background:#fff}
.seo-intro-inner{
  display:grid;grid-template-columns:1fr 1.15fr;gap:64px;align-items:center;
}
.seo-intro-media{position:relative}
.seo-intro-media img{
  border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);
  aspect-ratio:16/10;object-fit:cover;
}
.seo-intro-stamp{
  position:absolute;right:-18px;bottom:34px;
  background:var(--grad-coffee);color:#fff;
  padding:16px 22px;border-radius:16px;font-weight:800;
  font-size:15px;line-height:1.5;text-align:center;
  box-shadow:0 16px 40px rgba(169,136,89,.4);
}
.seo-intro-text p{color:var(--text-2);margin-bottom:14px}
.seo-intro-list{margin-top:30px;border-top:1px solid var(--line)}
.seo-intro-list li{
  display:flex;gap:20px;padding:20px 0;border-bottom:1px solid var(--line);
}
.seo-intro-list b{
  flex-shrink:0;width:72px;color:var(--coffee-deep);font-size:15px;font-weight:800;
}
.seo-intro-list p{margin:0;font-size:15px}

/* ---------- 3. 深色纵向编号步骤 ---------- */
.seo-dark{background:var(--ink);color:#E9E2D6}
.seo-dark h2{color:#fff}
.seo-step-list{
  max-width:860px;margin:0 auto;
  border-left:2px solid rgba(201,168,124,.35);
}
.seo-step{
  position:relative;display:grid;grid-template-columns:90px 1fr;gap:28px;
  padding:26px 0 26px 34px;margin-left:4px;
}
.seo-step::before{
  content:"";position:absolute;left:-9px;top:38px;
  width:16px;height:16px;border-radius:50%;
  background:var(--grad-coffee);box-shadow:0 0 0 5px rgba(201,168,124,.18);
}
.seos-num{
  font-size:44px;font-weight:900;line-height:1;
  color:transparent;-webkit-text-stroke:1.5px rgba(201,168,124,.75);
  font-variant-numeric:tabular-nums;
}
.seos-body h3{color:#fff;font-size:20px;margin-bottom:8px}
.seos-body p{color:#B7AE9E;font-size:15px;line-height:1.85}

/* ---------- 4. 案例 + 相关服务 ---------- */
.seo-case-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.seo-case-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:all .4s;
}
.seo-case-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.seo-case-card img{aspect-ratio:16/9;object-fit:cover;width:100%}
.seo-case-card h3{font-size:18px;margin:18px 24px 10px}
.seo-case-card h3 a:hover{color:var(--coffee-deep)}
.seo-case-card p{font-size:14px;color:var(--text-2);margin:0 24px 22px;line-height:1.8}
.seoc-tag{
  display:inline-block;margin:18px 0 0 24px;padding:5px 14px;border-radius:100px;
  background:var(--coffee-bg);color:var(--coffee-deep);font-size:12px;font-weight:700;
}
.seo-relate{
  margin-top:44px;padding:22px 28px;border-radius:var(--radius-md);
  background:var(--coffee-bg);display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  font-size:14px;
}
.seo-relate span{font-weight:800;color:var(--ink);flex-shrink:0}
.seo-relate a{
  padding:7px 16px;border-radius:100px;background:#fff;
  color:var(--coffee-deep);font-weight:700;transition:all .3s;
}
.seo-relate a:hover{background:var(--grad-coffee);color:#fff}

/* ---------- 5. FAQ 手风琴 ---------- */
.seo-faq{background:var(--coffee-bg)}
.seo-acc{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.acc-item{
  background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);
  overflow:hidden;transition:box-shadow .3s;
}
.acc-item.open{box-shadow:var(--shadow-md)}
.acc-head{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:22px 28px;text-align:left;font-size:17px;font-weight:800;color:var(--ink);
}
.acc-head svg{
  width:18px;height:18px;color:var(--coffee-deep);flex-shrink:0;
  transition:transform .35s;
}
.acc-item.open .acc-head svg{transform:rotate(180deg)}
.acc-panel{max-height:0;overflow:hidden;transition:max-height .4s ease}
.acc-panel p{padding:0 28px 24px;color:var(--text-2);font-size:15px;line-height:1.9}
.acc-panel a{color:var(--coffee-deep);font-weight:700;text-decoration:underline}

/* ---------- 6. CTA ---------- */
.seo-cta{
  position:relative;overflow:hidden;background:var(--ink);
  text-align:center;
}
.seo-cta-bg{z-index:0}
.seo-cta-veil{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(16,15,13,.88),rgba(16,15,13,.72));
}
.seo-cta-inner{position:relative;z-index:2}
.seo-cta-title{font-size:clamp(28px,4vw,44px);color:#fff;font-weight:900;line-height:1.35;margin-bottom:18px}
.seo-cta-sub{color:#CFC7B8;font-size:16px;margin-bottom:36px}
.seo-cta-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .seo-hero-inner{grid-template-columns:1fr;gap:36px}
  .seo-rank-card{max-width:480px}
  .seo-intro-inner{grid-template-columns:1fr;gap:40px}
  .seo-case-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .seo-hero{padding:120px 0 60px}
  .seo-step{grid-template-columns:1fr;gap:10px;padding-left:24px}
  .seo-intro-stamp{right:8px;bottom:20px}
}