/* ==========================================================================
   seo.html · SEO优化服务
   版式：居中紧凑 Hero + 关键词阶梯（阶梯条） + 排名对照（前后双条）
         + 左清单右附图（纵向错落） + 深底衔接区 + 数据条
   ========================================================================== */

/* ---------- 页首 Banner：居中紧凑型 ---------- */
.seo-hero{padding:150px 0 40px;text-align:center}
.seo-hero .crumb{justify-content:center;margin-bottom:26px}
.seo-hero h1{margin:16px auto 0;max-width:820px}
.seo-hero-sub{max-width:660px;margin:20px auto 0;color:var(--ink-2);font-size:16px;line-height:2}
.seo-hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.seo-hero-media{margin:48px auto 0;max-width:960px}
.seo-hero-media img{border-radius:var(--r);box-shadow:var(--shadow);width:100%;height:auto}
.seo-hero-media figcaption{margin-top:12px;font-size:13px;color:var(--muted)}

/* ---------- 关键词阶梯 ---------- */
.ladder{padding:70px 0 20px}
.ladder-list{margin-top:36px;display:grid;gap:18px;max-width:960px}
.ladder-item{
  position:relative;display:grid;grid-template-columns:150px 1fr;gap:0 26px;align-items:stretch;
  background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);padding:26px 30px;
}
/* 阶梯条：右侧伸出的色块，越靠前越长，形成塔状错落 */
.ladder-tier{
  align-self:start;font-size:12.5px;letter-spacing:.14em;color:var(--brown-soft);
  background:var(--brown-bg);border-radius:999px;padding:6px 14px;text-align:center;
}
.ladder-body h3{font-size:21px;margin-bottom:8px}
.ladder-body p{color:var(--ink-2);font-size:14.5px;line-height:1.95;max-width:640px}
.ladder-bar{position:absolute;right:0;top:0;bottom:0;width:6px;border-radius:0 var(--r) var(--r) 0;background:var(--brown-bg)}
.lb-a{width:14px;opacity:.45}
.lb-b{width:26px;opacity:.65}
.lb-c{width:40px;opacity:.85}
.lb-d{width:56px;background:var(--brown);opacity:1}
/* 奇数行整体右移一点，形成错落 */
.ladder-item:nth-child(odd){transform:translateX(28px)}
.ladder-item:nth-child(1){transform:translateX(0)}

/* ---------- 排名对照 ---------- */
.rank{padding:60px 0 20px}
.rank-board{
  margin-top:34px;background:var(--brown-deep);border-radius:var(--r);
  padding:38px 40px;color:#e9e2d6;display:grid;gap:26px;
}
.rank-row{display:grid;grid-template-columns:220px 1fr;gap:20px;align-items:center}
.rank-kw{font-family:var(--font-serif);font-size:17px;color:#fff}
.rank-bars{display:grid;gap:9px}
.rank-pair{display:grid;grid-template-columns:64px 1fr 150px;gap:14px;align-items:center;font-size:13.5px}
.rp-tag{color:rgba(255,255,255,.5);font-size:12px;letter-spacing:.1em}
.rp-tag-after{color:#e8c9a0}
.rp-bar{height:10px;background:rgba(255,255,255,.1);border-radius:99px;overflow:hidden}
.rp-bar i{display:block;height:100%;border-radius:99px}
.rb-before{width:6%;background:#8a7f72}
.rb-before.short{width:2%;background:#8a7f72}
.rb-mid{width:30%;background:#a99a86}
.rb-after{width:88%;background:#e8b06a}
.rb-after.mid2{width:56%}
.rb-after.top{width:97%;background:#f0cf9a}
.rank-pair b{font-weight:600;color:#fff;font-size:13px;text-align:right}
.rank-note{margin-top:18px;font-size:13.5px;color:var(--muted)}

/* ---------- 我们做什么：清单 + 附图错落 ---------- */
.scope{padding:70px 0 10px}
.scope-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:44px;margin-top:36px;align-items:start}
.scope-list{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.scope-item{background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);padding:24px 22px}
.scope-item:nth-child(odd){transform:translateY(18px)}
.scope-item b{
  display:block;font-family:var(--font-serif);font-size:24px;color:var(--brown-bg);margin-bottom:8px;
}
.scope-item h3{font-size:17px;margin-bottom:7px}
.scope-item p{font-size:13.5px;color:var(--ink-2);line-height:1.85}
.scope-media img{border-radius:var(--r);width:100%;height:auto;box-shadow:var(--shadow)}
.scope-media-note{
  margin-top:18px;background:var(--brown-bg);border-radius:var(--r);padding:22px 24px;
}
.scope-media-note h3{font-size:17px;margin-bottom:8px;color:var(--brown-deep)}
.scope-media-note p{font-size:14px;color:var(--ink-2);line-height:1.9}

/* ---------- 深底衔接区 ---------- */
.seolink{margin-top:80px;background:var(--brown);color:#efe8dc}
.seolink-in{display:grid;grid-template-columns:1.15fr 1fr;gap:50px;align-items:center;padding:70px 28px}
.sec-eyebrow-light{color:#d9b98c}
.sec-eyebrow-light::before{background:#d9b98c}
.seolink-copy h2{color:#fff;margin:12px 0 16px}
.seolink-copy p{color:rgba(255,255,255,.72);font-size:15px;line-height:2;max-width:560px}
.seolink-btns{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.seolink-line{color:#fff;border-color:rgba(255,255,255,.45)}
.seolink-line:hover{background:#fff;color:var(--brown)}
.seolink-img img{border-radius:var(--r);width:100%;height:auto}

/* ---------- 数据条 ---------- */
.stats{padding:60px 0 10px}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stats-item{
  background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);
  padding:28px 24px;text-align:center;
}
.stats-item:nth-child(2){transform:translateY(16px)}
.stats-item:nth-child(4){transform:translateY(-8px)}
.stats-item b{font-family:var(--font-serif);font-size:42px;color:var(--brown-deep);display:block;line-height:1.1}
.stats-item b em{font-style:normal;font-size:22px;color:var(--brown-soft)}
.stats-item span{font-size:13.5px;color:var(--ink-2)}

/* ---------- 客户反馈 ---------- */
.voices{padding:60px 0 10px}
.voice-grid{margin-top:36px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.voice-card{
  background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);
  padding:28px 30px;position:relative;
}
.voice-card:nth-child(2){transform:translateY(20px)}
.voice-card p{font-family:var(--font-serif);font-size:17px;line-height:1.9;color:var(--brown-deep)}
.voice-card footer{margin-top:16px;font-size:13px;color:var(--muted)}

/* ---------- FAQ ---------- */
.faq{padding:70px 0 10px}
.faq-list{display:grid;gap:14px}
.faq details{background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);padding:18px 24px}
.faq summary{cursor:pointer;font-weight:600;color:var(--brown-deep);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"Q";display:inline-block;width:22px;height:22px;line-height:22px;text-align:center;border-radius:50%;background:var(--brown-bg);color:#fff;font-size:12px;margin-right:10px}
.faq p{color:var(--ink-2);font-size:14.5px;line-height:1.9;margin:12px 0 0 32px}
.faq p a{color:var(--brown);text-decoration:underline;text-underline-offset:3px}

/* ---------- 联系 CTA ---------- */
.seo-cta{margin-top:80px;background:var(--brown-deep);color:#efe8dc}
.seo-cta-in{display:flex;justify-content:space-between;align-items:center;gap:36px;padding:64px 28px;flex-wrap:wrap}
.seo-cta-copy h2{color:#fff;margin-bottom:12px}
.seo-cta-copy p{color:rgba(255,255,255,.68);font-size:14.5px;line-height:2}
.seo-cta-btns{display:flex;gap:14px;flex-wrap:wrap}
.seo-cta-line{color:#fff;border-color:rgba(255,255,255,.45)}
.seo-cta-line:hover{background:#fff;color:var(--brown-deep)}

/* ---------- 延伸阅读 ---------- */
.more-sec{padding:60px 0 10px}
.more-grid{margin-top:30px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.more-card{
  display:block;background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);
  padding:20px 20px;text-decoration:none;color:var(--brown-deep);transition:transform .3s,border-color .3s;
}
.more-card:hover{transform:translateY(-4px);border-color:var(--brown-soft)}
.more-card b{font-size:15.5px;display:block;margin-bottom:8px}
.more-card p{font-size:13px;color:var(--ink-2);line-height:1.8}

/* ---------- 第一个月 ---------- */
.week-sec{padding:50px 0 10px}
.week-list{margin-top:26px;display:grid;gap:10px;max-width:860px}
.wk-row{
  display:grid;grid-template-columns:110px 1fr;gap:18px;align-items:center;
  background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);padding:16px 22px;
}
.wk-row b{font-family:var(--font-serif);color:var(--brown)}
.wk-row p{font-size:13.5px;color:var(--ink-2)}

/* ---------- 资料清单 ---------- */
.docs-sec{padding:50px 0 10px}
.docs-list{margin-top:24px;display:grid;grid-template-columns:1fr 1fr;gap:10px;max-width:900px}
.docs-list li{
  background:var(--card);border:1px solid var(--line-2);border-radius:var(--r);
  padding:14px 20px;font-size:13.5px;color:var(--ink-2);list-style:none;
}
.docs-list li::before{content:"·";color:var(--brown-soft);font-weight:700;margin-right:8px}

/* ---------- 说句实在话 ---------- */
.mis-sec{padding:60px 0 10px}
.mis-quote{
  max-width:820px;margin:0 auto;font-family:var(--font-serif);font-size:19px;line-height:2.1;
  color:var(--brown-deep);border-left:3px solid var(--brown-soft);padding-left:26px;
}

/* ---------- 服务地区 ---------- */
.area-sec{padding:50px 0 70px}
.area-in{
  background:var(--paper);border:1px dashed var(--line);border-radius:var(--r);
  padding:34px 30px;text-align:center;
}
.area-in h3{font-size:18px;margin-bottom:12px}
.area-in p{font-size:13.5px;color:var(--ink-2);line-height:2;letter-spacing:.05em}

/* ---------- 数字条 ---------- */
.stats-band{padding:30px 0 10px}
.sb-in{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.sb-item{background:var(--brown-deep);color:#efe8dc;border-radius:var(--r);padding:26px 20px;text-align:center}
.sb-item b{font-family:var(--font-serif);font-size:36px;color:#fff;display:block}
.sb-item b em{font-style:normal;font-size:18px;color:#d9b98c;margin-left:2px}
.sb-item span{font-size:12.5px;color:rgba(255,255,255,.65)}

/* ---------- 收费小条 ---------- */
.strip-sec{padding:30px 0 10px}
.strip-in{
  background:var(--paper);border:1px solid var(--line-2);border-left:4px solid var(--brown-soft);
  border-radius:var(--r);padding:26px 30px;
}
.strip-in h3{font-size:17px;margin-bottom:8px}
.strip-in p{font-size:14px;color:var(--ink-2);line-height:1.9}

/* ---------- 图文块 ---------- */
.pic-sec{padding:50px 0 10px}
.pic-in{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.pic-text h2{font-size:26px;margin:10px 0 16px}
.pic-text p{color:var(--ink-2);font-size:14.5px;line-height:2;margin-bottom:12px}
.pic-img img{width:100%;height:auto;border-radius:var(--r);border:1px solid var(--line-2)}

/* ---------- 更多问答 ---------- */
.faq2-sec{padding:40px 0 10px}
.faq2-sec .faq-list{margin-top:24px}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .scope-grid{grid-template-columns:1fr}
  .seolink-in{grid-template-columns:1fr}
  .rank-row{grid-template-columns:1fr;gap:10px}
  .more-grid{grid-template-columns:1fr 1fr}
  .docs-list{grid-template-columns:1fr}
  .sb-in{grid-template-columns:1fr 1fr}
  .pic-in{grid-template-columns:1fr}
}
@media (max-width:640px){
  .seo-hero{padding-top:120px}
  .ladder-item{grid-template-columns:1fr;gap:10px;padding:22px}
  .ladder-item:nth-child(odd){transform:none}
  .scope-list{grid-template-columns:1fr}
  .scope-item:nth-child(odd){transform:none}
  .stats-grid{grid-template-columns:1fr 1fr}
  .stats-item:nth-child(2),.stats-item:nth-child(4){transform:none}
  .rank-board{padding:26px 20px}
  .rank-pair{grid-template-columns:56px 1fr 110px;font-size:12.5px}
  .week-row{grid-template-columns:1fr;gap:6px}
  .voice-grid{grid-template-columns:1fr}
  .voice-card:nth-child(2){transform:none}
  .more-grid{grid-template-columns:1fr}
}