/* ============================================================
   hhlsq.com — seo.css SEO 优化服务页专属样式
   布局指纹：H4 居中剧场 Hero ｜ B3 步骤时间轴｜B11 周期表｜B2 错位卡片墙｜B4 图文交替｜B13 套餐｜B15 CTA
   签名元素：S5 竖向标尺线
   ============================================================ */

/* ---------- 1. Hero H4 居中剧场 ---------- */
.seo-hero{ background:var(--white); padding:clamp(56px,7vw,96px) 0 clamp(48px,6vw,72px); position:relative; overflow:hidden; }
.seo-hero::before{
  content:""; position:absolute; top:0; left:50%; transform:translateX(-50%);
  width:120px; height:2px; background:var(--gold); opacity:.7;
}
.seo-hero__inner{ text-align:center; position:relative; z-index:1; }
.seo-hero__title{ font-size:clamp(30px,4.4vw,52px); line-height:1.28; margin-bottom:18px; letter-spacing:-.01em; }
.seo-hero__title em{ font-style:normal; font-family:var(--font-serif); color:var(--gold); }
.seo-hero__lead{ color:var(--gray-600); font-size:16.5px; max-width:680px; margin:0 auto 30px; }
.seo-hero__actions{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-bottom:clamp(40px,5vw,64px); }

.seo-hero__shots{ display:grid; grid-template-columns:1fr 1.25fr 1fr; gap:22px; align-items:start; }
.seo-hero__shot{ border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-md); }
.seo-hero__shot img{ width:100%; aspect-ratio:16/10; object-fit:cover; }
.seo-hero__shot--l{ transform:translateY(26px) rotate(-1.4deg); }
.seo-hero__shot--m{ transform:translateY(8px); box-shadow:var(--shadow-lg); }
.seo-hero__shot--r{ transform:translateY(40px) rotate(1.6deg); }

/* ---------- 2. B3 步骤时间轴 + S5 竖向标尺线 ---------- */
.seo-flow{ background:var(--gray-100); overflow:hidden; }
.seo-flow__inner{ position:relative; }
.seo-ruler{
  position:absolute; left:-6px; top:8px; bottom:8px; width:14px;
  background:repeating-linear-gradient(to bottom, var(--navy-500) 0 2px, transparent 2px 14px);
  opacity:.55;
}
.seo-ruler__text{
  position:absolute; left:22px; top:50%; transform:translateY(-50%) rotate(180deg);
  writing-mode:vertical-rl; font-size:12px; letter-spacing:.3em; color:var(--gray-500);
}
.seo-steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:24px; position:relative; z-index:1; margin-left:24px; }
.seo-step{ position:relative; padding-top:26px; }
.seo-step::before{
  content:""; position:absolute; left:0; top:0; width:100%; height:1px;
  background:linear-gradient(to right, var(--gold), var(--gray-300));
}
.seo-step__num{
  display:inline-flex; align-items:center; justify-content:center;
  width:52px; height:52px; border-radius:50%;
  border:1.5px solid var(--navy-600); color:var(--navy-700);
  font-weight:700; font-size:17px; background:#fff; box-shadow:var(--shadow-sm);
  margin-bottom:16px;
}
.seo-step h3{ font-size:17px; margin-bottom:8px; }
.seo-step p{ font-size:14px; color:var(--gray-600); line-height:1.8; }

/* ---------- 3. B11 周期表 ---------- */
.seo-tablewrap{ overflow-x:auto; border-radius:var(--radius-lg); box-shadow:var(--shadow-sm); }
.seo-table{ width:100%; border-collapse:collapse; background:#fff; min-width:640px; }
.seo-table th{
  background:var(--navy-900); color:#fff; text-align:left;
  padding:16px 20px; font-size:14.5px; font-weight:600; letter-spacing:.04em;
}
.seo-table td{ padding:16px 20px; font-size:14.5px; color:var(--gray-700); border-bottom:1px solid var(--gray-200); }
.seo-table tbody tr:nth-child(odd){ background:var(--gray-50); }
.seo-table tbody tr:hover{ background:var(--blue-soft); }
.seo-table td strong{ color:var(--navy-800); }

/* ---------- 4. B2 错位卡片墙 ---------- */
.seo-cardgrid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.seo-card{
  background:#fff; border:1px solid var(--gray-200); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm); padding:28px 26px; transition:all .3s ease;
}
.seo-card:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); }
.seo-card:nth-child(even){ transform:translateY(18px); }
.seo-card:nth-child(even):hover{ transform:translateY(12px); }
.seo-card svg{ width:32px; height:32px; color:var(--navy-600); stroke-width:1.4; margin-bottom:14px; }
.seo-card:hover svg{ color:var(--gold); }
.seo-card h3{ font-size:17px; margin-bottom:10px; }
.seo-card p{ font-size:14px; color:var(--gray-600); line-height:1.75; margin:0; }

/* ---------- 5. B4 图文交替流 ---------- */
.seo-pair{ display:grid; grid-template-columns:1fr 1fr; gap:44px; align-items:center; margin-bottom:clamp(40px,5vw,64px); }
.seo-pair:last-child{ margin-bottom:0; }
.seo-pair--reverse .seo-pair__media{ order:2; }
.seo-pair__media img{ width:100%; aspect-ratio:16/9; object-fit:cover; border-radius:var(--radius-lg); box-shadow:var(--shadow-md); }
.seo-pair__num{ font-size:46px; font-weight:700; color:transparent; -webkit-text-stroke:1.5px var(--gold); line-height:1; display:block; margin-bottom:10px; }
.seo-pair__body h3{ font-size:22px; margin-bottom:12px; }
.seo-pair__body p{ color:var(--gray-600); font-size:15px; margin:0 0 12px; }
.seo-pair__body p:last-child{ margin-bottom:0; }
.seo-pair__body a{ font-weight:600; }

/* ---------- 6. B13 套餐 ---------- */
.seo-plangrid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; align-items:start; }
.seo-plan{
  background:#fff; border-radius:var(--radius-lg); box-shadow:var(--shadow-sm);
  padding:32px 26px; text-align:center; transition:all .3s ease;
}
.seo-plan:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); }
.seo-plan--hot{ background:var(--navy-900); color:#E8EEF5; transform:translateY(-16px); box-shadow:var(--shadow-lg); }
.seo-plan--hot:hover{ transform:translateY(-22px); }
.seo-plan--hot h3{ color:#fff; }
.seo-plan__tag{
  display:inline-block; font-size:12px; letter-spacing:.14em; color:var(--gold);
  border:1px solid var(--gold); border-radius:var(--radius-pill); padding:4px 14px; margin-bottom:16px;
}
.seo-plan--hot .seo-plan__tag{ background:var(--gold); color:#fff; }
.seo-plan__name{ font-size:19px; margin-bottom:10px; }
.seo-plan__price{ font-size:32px; font-weight:700; color:var(--navy-700); margin-bottom:20px; }
.seo-plan__price em{ font-style:normal; font-size:18px; }
.seo-plan__price small{ font-size:13px; font-weight:400; color:var(--gray-500); margin-left:2px; }
.seo-plan--hot .seo-plan__price{ color:#fff; }
.seo-plan__list{ text-align:left; margin-bottom:22px; }
.seo-plan__list li{ position:relative; padding:7px 0 7px 22px; font-size:14px; color:var(--gray-600); }
.seo-plan--hot .seo-plan__list li{ color:rgba(232,238,245,.82); }
.seo-plan__list li::before{ content:"✓"; position:absolute; left:0; color:var(--gold); font-weight:700; }
.seo-plan .btn{ width:100%; }

/* ---------- 7. B15 CTA ---------- */
.seo-cta{ padding-bottom:clamp(70px,8vw,110px); }
.seo-ctabanner{
  background:linear-gradient(135deg,var(--navy-800),var(--navy-700) 55%,var(--navy-600));
  border-radius:28px; padding:clamp(44px,5vw,72px) clamp(24px,4vw,56px);
  text-align:center; position:relative; overflow:hidden; box-shadow:var(--shadow-lg);
}
.seo-ctabanner::before{
  content:""; position:absolute; left:24px; top:20px; bottom:20px; width:10px;
  background:repeating-linear-gradient(to bottom, var(--gold) 0 2px, transparent 2px 14px);
  opacity:.5;
}
.seo-ctabanner__inner{ position:relative; z-index:1; }
.seo-ctabanner__title{ color:#fff; font-size:clamp(22px,3vw,32px); margin-bottom:12px; }
.seo-ctabanner__sub{ color:rgba(232,238,245,.78); font-size:15px; margin-bottom:28px; }
.seo-ctabanner__actions{ display:flex; gap:16px; justify-content:center; flex-wrap:wrap; margin-bottom:30px; }
.seo-ctabanner__more{ display:flex; gap:22px; justify-content:center; flex-wrap:wrap; }
.seo-ctabanner__more a{ color:rgba(232,238,245,.7); font-size:13.5px; border-bottom:1px dashed rgba(232,238,245,.3); padding-bottom:2px; }
.seo-ctabanner__more a:hover{ color:var(--gold); }

/* ---------- 响应式 ---------- */
@media (max-width: 992px){
  .seo-hero__shots{ grid-template-columns:1fr; gap:18px; }
  .seo-hero__shot--l,.seo-hero__shot--m,.seo-hero__shot--r{ transform:none; }
  .seo-steps{ grid-template-columns:1fr 1fr; gap:32px 24px; }
  .seo-cardgrid{ grid-template-columns:repeat(2,1fr); }
  .seo-card:nth-child(even){ transform:none; }
  .seo-pair{ grid-template-columns:1fr; gap:24px; }
  .seo-pair--reverse .seo-pair__media{ order:0; }
  .seo-plangrid{ grid-template-columns:1fr; max-width:480px; margin:0 auto; }
  .seo-plan--hot{ transform:none; }
  .seo-plan--hot:hover{ transform:translateY(-6px); }
  .seo-ruler{ display:none; }
  .seo-steps{ margin-left:0; }
}
@media (max-width: 640px){
  .seo-steps{ grid-template-columns:1fr; }
  .seo-cardgrid{ grid-template-columns:1fr; }
  .seo-hero__actions .btn{ width:100%; }
  .seo-table{ min-width:560px; }
}