/* ============================================================
   SEO学院 · seo.css（SEO优化方案总览）
   十字分割非对称：横线切割 + 上升数据卡 + 漏斗节奏
   ============================================================ */

/* ---------- 1. Hero ---------- */
.seo-hero{background:linear-gradient(180deg,#EFF9F3 0%,#F3FAFD 100%);padding:46px 0 88px;overflow:hidden}
.seo-hero-x{top:52%}
.seo-blob{width:120px;height:120px;background:var(--yellow);top:30px;right:12%;opacity:.3;border-radius:30px}
.seo-dough{width:70px;height:70px;background:var(--blue);left:4%;bottom:60px;border-radius:50%;opacity:.4}
.seo-hero-in{display:grid;grid-template-columns:1.02fr .98fr;gap:60px;align-items:center}
.seo-hero-text h1{font-size:clamp(32px,4.2vw,50px);line-height:1.22;margin:18px 0 20px}
.seo-hero-text h1 em{font-style:normal;color:var(--green-deep)}
.seo-hero-text>p{color:var(--muted);max-width:540px;margin-bottom:28px}
.seo-hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.seo-hero-chips{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.seo-hero-chips span{
  background:#fff;border:2px solid var(--line);border-radius:999px;
  padding:7px 16px;font-size:13.5px;font-weight:700;color:var(--blue-ink);
}
.seo-hero-media{position:relative;transform:translateY(22px)}
.seo-hero-media .photo{width:100%;aspect-ratio:16/10;border:5px solid #fff}
.seo-media-cap{
  position:absolute;left:-22px;bottom:30px;
  display:flex;align-items:center;gap:8px;
  background:var(--green-deep);color:#fff;
  padding:11px 18px;border-radius:14px;font-weight:800;font-size:14.5px;
  box-shadow:var(--shadow-sm);transform:rotate(-2deg);
}
.seo-rank-tag{
  position:absolute;top:-18px;right:16px;
  background:var(--yellow);color:var(--ink);
  font-size:13.5px;font-weight:800;padding:9px 17px;border-radius:999px;
  transform:rotate(2deg);box-shadow:var(--shadow-sm);
}
.seo-rank-tag b{font-size:17px}

/* ---------- 2. 价值数据卡 ---------- */
.seo-value{background:var(--white)}
.seo-value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.seo-value-card{
  position:relative;background:var(--bg);
  border:2px solid var(--line);border-radius:var(--r-lg);
  padding:34px 28px;overflow:hidden;
  transition:transform .3s ease,box-shadow .3s ease;
}
.seo-value-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.seo-value-card b{
  display:block;font-size:52px;font-weight:900;
  color:var(--blue-deep);line-height:1.1;margin-bottom:12px;
}
.seo-value-card:nth-child(2) b{color:var(--green-deep)}
.seo-value-card:nth-child(3) b{color:var(--yellow-deep)}
.seo-value-card h3{font-size:18px;margin-bottom:10px}
.seo-value-card p{font-size:14.5px;color:var(--muted)}
.seo-value-card::after{
  content:"";position:absolute;right:-30px;bottom:-30px;
  width:120px;height:120px;border-radius:50%;background:var(--blue);opacity:.08;
}

/* ---------- 3. 优化内容 ---------- */
.seo-work{background:var(--cream);position:relative}
.seo-work-v{left:12%}
.seo-work-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.seo-work-card{
  position:relative;display:block;
  background:#fff;border:2px solid var(--line);border-radius:var(--r-lg);
  padding:30px 26px;overflow:hidden;
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.seo-work-card:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:var(--green-deep)}
.seo-work-no{
  font-size:46px;font-weight:900;color:rgba(111,198,155,.18);
  position:absolute;top:12px;right:18px;line-height:1;
}
.seo-work-card h3{font-size:19px;margin-bottom:10px}
.seo-work-card p{font-size:14.5px;color:var(--muted);margin-bottom:16px}
.seo-work-card em{font-style:normal;font-size:14px;font-weight:800;color:var(--green-deep)}

/* ---------- 4. 流程漏斗 ---------- */
.seo-flow{background:var(--bg)}
.seo-flow-list{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  position:relative;
}
.seo-flow-item{position:relative;text-align:center;padding:0 22px}
.seo-flow-item::before{
  content:"";position:absolute;top:27px;right:-16px;left:-16px;
  height:4px;background:repeating-linear-gradient(90deg,var(--green-deep) 0 16px,transparent 16px 28px);
  opacity:.4;
}
.seo-flow-item:first-child::before{left:50%}
.seo-flow-item:last-child::before{right:50%}
.seo-flow-item span{
  position:relative;z-index:2;
  display:inline-flex;align-items:center;justify-content:center;
  width:56px;height:56px;border-radius:50%;
  background:var(--green);color:var(--ink);
  font-weight:900;font-size:18px;border:5px solid #fff;
  box-shadow:var(--shadow-sm);margin-bottom:14px;
}
.seo-flow-item:nth-child(3n) span{background:var(--yellow)}
.seo-flow-item b{display:block;font-size:16px;margin-bottom:5px}
.seo-flow-item i{font-style:normal;font-size:13px;color:var(--muted);display:block}
.seo-flow-note{text-align:center;margin-top:40px;color:var(--muted);font-size:14.5px}

/* ---------- 5. 区域服务 ---------- */
.seo-area{background:var(--white);position:relative}
.seo-area-x{top:50%}
.seo-area-in{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.seo-area-text h2{margin-bottom:16px}
.seo-area-text p{color:var(--muted);margin-bottom:26px}
.seo-area-map{
  position:relative;background:var(--bg);
  border:2px dashed var(--line-strong);border-radius:var(--r-lg);
  padding:44px;display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:center;
  min-height:220px;
}
.seo-area-map::before,.seo-area-map::after{
  content:"";position:absolute;background:var(--blue);opacity:.25;
}
.seo-area-map::before{width:2px;top:20px;bottom:20px;left:50%}
.seo-area-map::after{height:2px;left:20px;right:20px;top:50%}
.seo-area-map a{
  position:relative;z-index:2;
  background:#fff;border:2px solid var(--blue);
  padding:14px 26px;border-radius:999px;
  font-weight:800;font-size:15px;color:var(--blue-ink);
  transition:transform .25s ease,background .25s ease,color .25s ease;
}
.seo-area-map a:hover{transform:translateY(-4px) rotate(-1deg);background:var(--blue);color:#fff}
.seo-area-pin{
  position:absolute;bottom:-15px;right:24px;
  background:var(--yellow);color:var(--ink);
  font-size:13px;font-weight:800;padding:7px 15px;border-radius:999px;
  transform:rotate(-2deg);box-shadow:var(--shadow-sm);
}

/* ---------- 6. FAQ ---------- */
.seo-faq{background:var(--cream)}
.seo-faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.seo-faq-item{
  background:#fff;border:2px solid var(--line);border-radius:var(--r-md);
  overflow:hidden;transition:border-color .25s ease,box-shadow .25s ease;
}
.seo-faq-item[open]{border-color:var(--green-deep);box-shadow:var(--shadow-sm)}
.seo-faq-item summary{
  list-style:none;cursor:pointer;padding:17px 22px;
  font-weight:800;font-size:16px;display:flex;gap:12px;align-items:center;
}
.seo-faq-item summary::-webkit-details-marker{display:none}
.seo-faq-item summary::after{
  content:"+";margin-left:auto;flex:none;
  width:28px;height:28px;border-radius:50%;
  background:var(--green);color:var(--ink);
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:800;transition:transform .3s ease;
}
.seo-faq-item[open] summary::after{transform:rotate(45deg);background:var(--yellow)}
.seo-faq-item p{padding:0 22px 18px;color:var(--muted);font-size:15px}
.seo-faq-more{text-align:center;margin-top:28px;color:var(--muted)}
.seo-faq-more a{font-weight:800;color:var(--blue-deep)}

/* ---------- 7. CTA ---------- */
.seo-cta{background:var(--white)}
.seo-cta-band{
  position:relative;overflow:hidden;
  background:linear-gradient(120deg,#3E86AD,var(--blue-ink));
  border-radius:var(--r-lg);padding:60px 44px;text-align:center;color:#fff;
}
.seo-cta-band::after{
  content:"";position:absolute;right:-60px;top:-60px;
  width:220px;height:220px;border-radius:50%;
  border:26px solid rgba(255,222,107,.22);
}
.seo-cta-band h2{color:#fff;font-size:clamp(26px,3.2vw,38px);margin-bottom:14px}
.seo-cta-band>p{color:#C9E4F2;margin-bottom:30px}
.seo-cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;position:relative;z-index:2}
.seo-cta-wechat{margin-top:22px;font-size:14.5px;color:#A9CFE2}

/* ---------- 响应式 ---------- */
@media (max-width:1000px){
  .seo-hero-in{grid-template-columns:1fr;gap:50px}
  .seo-value-grid{grid-template-columns:1fr 1fr}
  .seo-work-grid{grid-template-columns:1fr 1fr}
  .seo-flow-list{grid-template-columns:1fr 1fr;gap:22px 0}
  .seo-flow-item::before{display:none}
  .seo-area-in{grid-template-columns:1fr;gap:36px}
}
@media (max-width:640px){
  .seo-value-grid{grid-template-columns:1fr}
  .seo-work-grid{grid-template-columns:1fr}
  .seo-flow-list{grid-template-columns:1fr}
  .seo-area-map{padding:30px}
}

/* ===== SEO 服务细节模块（验收补强） ===== */
.seo-detail{position:relative;background:#f7fbfd;overflow:hidden}
.seo-detail-v{left:64%;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,rgba(142,208,236,0),rgba(142,208,236,.55),rgba(142,208,236,0))}
.seo-detail .container{position:relative;z-index:1}
.seo-detail-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:34px}
.seo-detail-card{background:#fff;border:2px solid #dceef7;border-radius:18px;padding:26px 24px;position:relative;transition:transform .35s ease,border-color .35s ease}
.seo-detail-card::before{content:"";position:absolute;top:-2px;left:24px;right:24px;height:6px;border-radius:6px;background:linear-gradient(90deg,#8ED0EC,#FFDE6B)}
.seo-detail-card:hover{transform:translateY(-6px);border-color:#8ED0EC}
.seo-detail-card b{display:block;font-size:1.15rem;color:#2a7f9e;margin-bottom:10px}
.seo-detail-card p{font-size:.95rem;line-height:1.85;color:#5b6b76}
.seo-detail-note{margin-top:30px;padding:18px 22px;background:#fffbe8;border-left:6px solid #FFDE6B;border-radius:0 14px 14px 0;font-size:.96rem;line-height:1.9;color:#7a6a2a}
@media (max-width:900px){.seo-detail-grid{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.seo-detail-grid{grid-template-columns:1fr}.seo-detail-v{left:50%}}.seo-detail-note2{margin-top:14px;padding:18px 22px;background:#fff;border:2px dashed #c9e4f2;border-radius:14px;font-size:.96rem;line-height:1.9;color:#5b6b76}