/* ============================================================
   萃见 Essight 设计系统（对齐《萃见品牌Logo》定案 2026-09-22）
   零装饰渐变 · 卡片无阴影 · 唯一交互色为辅绿
   V1.2 按 PRD §4 校准：字重只用 300/400/600；卡片标题与正文各档不递减；
   推荐档 2px 描边用 outline 实现（不使用 box-shadow）；V1.5 推荐高亮落在年度框架档
   ============================================================ */
:root{
  --ink:#0F1D19;
  --primary:#105943;
  --green:#2CB789;
  --green-ink:#087B57;
  --gold:#DEB459;
  --cream:#F7F5EF;
  --tint:#EAF8F2;
  --bamboo:#56D2A0;
  --gray:#5C6B66;
  --line:#E0E7E3;
  --on-dark:rgba(255,255,255,.78);
  --dark-line:rgba(255,255,255,.14);

  --f-title:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --f-body:"Sarasa Gothic SC","Sarasa UI SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --f-en:Inter,"SF Pro Text",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;

  --pad-x:80px;
  --nav-x:48px;
  /* 菜单链接组相对 logo 的额外右移（仅宽屏生效）。
     左侧留白已改为与正文版心 --pad-x 对齐，此值用于把菜单项推回原位 */
  --nav-shift:68px;
  --sticky-h:68px;   /* 吸顶导航高度，用于锚点定位补偿 */
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:#fff;color:var(--ink);
  font-family:var(--f-body);font-size:17px;line-height:1.47;
  font-weight:400;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:4px}

.wrap{max-width:1440px;margin:0 auto;padding:0 var(--pad-x)}
.section{padding:88px var(--pad-x)}
.section>.wrap-pad,.section-inner{max-width:1280px;margin:0 auto}
.bg-white{background:#fff}
.bg-cream{background:var(--cream)}

h1,h2,h3,h4{font-family:var(--f-title);font-weight:600;margin:0;line-height:1.18}
h1{font-size:56px;letter-spacing:-.02em}
h2{font-size:40px;letter-spacing:-.02em}
h3{font-size:21px;letter-spacing:-.01em;line-height:1.3}
p{margin:0}

.kicker{
  font-family:var(--f-body);font-size:14px;font-weight:600;
  color:var(--green);letter-spacing:.01em;margin:0 0 16px;
}
.lede{font-size:17px;color:var(--gray);max-width:820px}
.section-head{margin-bottom:40px}

/* ---------- 导航（滚动吸顶） ---------- */
.nav{
  background:var(--ink);color:#fff;
  position:sticky;top:0;z-index:50;
  border-bottom:1px solid var(--dark-line);
}
/* 吸顶态：滚动 0 → 80px 内渐入投影，纯 CSS 滚动驱动动画；
   不支持的浏览器降级为「实底 + 细线」，吸顶本身不受影响 */
@supports (animation-timeline:scroll()){
  .nav{
    animation:nav-stuck linear both;
    animation-timeline:scroll(root block);
    animation-range:0px 80px;
  }
  @keyframes nav-stuck{
    from{box-shadow:0 0 0 rgba(15,29,25,0),0 0 0 rgba(15,29,25,0)}
    to{box-shadow:0 1px 0 rgba(15,29,25,.05),0 16px 30px -16px rgba(15,29,25,.5)}
  }
}
.nav-inner{
  max-width:1440px;margin:0 auto;
  /* 左留白与正文版心 --pad-x 对齐（logo 与下方文字左边界齐平）；
     右留白保持 --nav-x 不变 */
  padding:13px var(--nav-x) 13px var(--pad-x);
  display:flex;align-items:center;gap:32px;
}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand img{height:30px;width:auto;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:32px;margin-left:calc(8px + var(--nav-shift))}
.nav-right{display:flex;align-items:center;gap:14px;margin-left:auto}
.nav-links a,.nav-right a.txt-link{color:#B9CCC6;font-size:13px;white-space:nowrap}
.nav-links a:hover,.nav-right a.txt-link:hover{color:#fff;text-decoration:none}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:999px;font-family:var(--f-body);font-size:17px;font-weight:400;
  padding:11px 22px;border:1px solid transparent;white-space:nowrap;
}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:#26a67b}
.btn-ghost{background:transparent;color:var(--green);border-color:var(--green)}
.btn-ghost:hover{background:var(--tint)}
.btn-sm{font-size:13px;font-weight:600;padding:8px 18px}

/* ---------- Hero ---------- */
.hero{padding:120px var(--pad-x) 104px;background:#fff}
.hero-inner{max-width:1280px;margin:0 auto;display:flex;flex-direction:column;align-items:flex-start;gap:26px}
.pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 16px;border-radius:999px;background:var(--cream);
  font-size:12px;color:var(--primary);
}
.pill .dot{width:6px;height:6px;border-radius:50%;background:var(--green);flex:0 0 auto}
.hero h1{max-width:900px}
.hero-sub{font-size:17px;color:var(--gray);max-width:760px}
.cta-row{display:flex;flex-wrap:wrap;gap:16px}
.trust{font-size:13px;color:var(--gray)}

/* ---------- 深色板块 ---------- */
.dark{background:var(--primary);color:#fff}
.dark .kicker{color:var(--bamboo)}
.dark .lede{color:var(--on-dark)}
.dark .note{color:rgba(255,255,255,.52)}
.dark .path h3{color:var(--bamboo)}
.dark .step .t{color:#fff}
.dark .step .d{color:var(--on-dark)}
.dark .arrow{color:var(--bamboo)}

/* ---------- 3.3 核心概念（双栏对比卡） ---------- */
.concept-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.concept{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:32px 28px;display:flex;flex-direction:column;gap:12px;
}
.concept .cname{font-size:13px;font-weight:600;color:var(--gray);letter-spacing:.02em}
.concept .quote{
  font-family:var(--f-title);font-size:22px;font-weight:600;
  color:var(--ink);line-height:1.35;
}
.concept .goal{font-size:14px;color:var(--gray);margin-top:auto}
.concept .goal strong{font-weight:600;color:var(--primary)}
.concept.is-geo{background:var(--tint);border-color:var(--green)}
.concept.is-geo .cname{color:var(--primary)}
.concept.is-geo .quote{color:var(--primary)}

/* ---------- 3.4 六大失语 ---------- */
.lapse-lead{
  font-size:17px;color:var(--on-dark);max-width:920px;line-height:1.6;
}
.lapse-lead .pct{
  font-family:var(--f-en);font-size:34px;font-weight:600;
  color:#fff;line-height:1;margin-right:8px;
}
.lapse-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:8px}
.lapse{
  background:rgba(255,255,255,.06);border:1px solid var(--dark-line);
  border-radius:18px;padding:26px 24px;display:flex;flex-direction:column;gap:10px;
}
.lapse .idx{font-family:var(--f-en);font-size:13px;font-weight:600;color:var(--bamboo)}
.lapse h3{font-size:17px;color:#fff}
.lapse .en{
  font-family:var(--f-en);font-size:10px;font-weight:600;
  letter-spacing:.12em;color:rgba(255,255,255,.45);
}
.lapse p{font-size:14px;color:var(--on-dark)}
.closing{
  font-family:var(--f-title);font-size:22px;font-weight:600;
  color:#fff;line-height:1.45;margin-top:44px;max-width:900px;
}
.note{font-size:12px;color:var(--gray);margin-top:24px}
.note+.note{margin-top:6px}

.path{margin-top:40px}
.path h3{font-size:14px;font-weight:600;color:var(--green);margin-bottom:20px}
.path-steps{display:flex;align-items:flex-start;gap:16px}
.step{flex:1 1 0;display:flex;flex-direction:column;gap:6px}
.step .t{font-family:var(--f-title);font-size:17px;font-weight:600;color:var(--ink)}
.step .d{font-size:14px;color:var(--gray)}
.arrow{font-size:18px;color:var(--green);line-height:1.6;flex:0 0 auto}

/* ---------- 3.5 平台流量（卡组） ---------- */
.plat-group{padding-top:16px}
.plat-group h3{font-size:13px;font-weight:600;color:var(--primary);margin-bottom:12px}
.plat-cards{display:grid;gap:16px}
.plat-cards.g6{grid-template-columns:repeat(6,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:24px 20px;display:flex;flex-direction:column;gap:8px;
}
.card .logo{display:block;width:40px;height:40px;margin-bottom:4px;flex:0 0 auto}
.card .logo img{display:block;width:100%;height:100%;object-fit:contain}
.card .name{font-family:var(--f-en);font-size:15px;font-weight:600;color:var(--ink)}
.card .name.cn{font-family:var(--f-title)}
.card .big{font-family:var(--f-en);font-size:28px;font-weight:600;color:var(--ink);line-height:1.1}
.card .src{font-size:12px;color:var(--gray);margin-top:auto}

/* ---------- 3.6 核心优势 ---------- */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:16px}
.adv{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:26px 22px;display:flex;flex-direction:column;gap:10px;
}
.adv .idx{font-family:var(--f-en);font-size:13px;font-weight:600;color:var(--green)}
.adv h3{font-size:17px;color:var(--ink)}
.adv .en{
  font-family:var(--f-en);font-size:10px;font-weight:600;
  letter-spacing:.12em;color:var(--gray);
}
.adv .sub{font-size:13px;color:var(--ink);line-height:1.6}
.adv ul{margin:0;padding:0;list-style:none}
.adv li{font-size:13px;color:var(--gray);line-height:2}
.closing-line{font-size:15px;color:var(--ink);margin-top:32px}

/* ---------- 3.7 四大系统 ---------- */
.sys-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.sys{
  background:var(--cream);border:1px solid var(--line);border-radius:18px;
  padding:28px 24px;display:flex;flex-direction:column;gap:12px;
}
.sys .en{font-family:var(--f-en);font-size:13px;font-weight:400;color:var(--gray)}
.sys .role{font-size:13px;font-weight:600;color:var(--green)}
.sys p{font-size:14px;color:var(--gray)}

/* ---------- 3.8 服务套餐 ---------- */
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:16px}
.plan{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:28px 24px;display:flex;flex-direction:column;gap:12px;
}
.plan.is-featured{border-color:var(--green);outline:1px solid var(--green);outline-offset:-1px}
.tag{
  display:inline-flex;align-self:flex-start;padding:5px 12px;border-radius:999px;
  font-family:var(--f-title);font-size:12px;font-weight:600;
  background:var(--cream);color:var(--gray);
}
.tag.is-green{background:var(--green);color:#fff}
.plan .pname{font-family:var(--f-title);font-size:19px;font-weight:600;color:var(--ink)}
.plan .psub{font-size:14px;color:var(--gray)}
.plan hr{border:0;border-top:1px solid var(--line);margin:0;width:100%}
.plan dl{margin:0;display:flex;flex-direction:column;gap:8px}
.plan dl>div{display:flex;gap:8px;font-size:13px;line-height:2}
.plan dt{color:var(--gray);flex:0 0 auto}
.plan dd{margin:0;color:var(--gray)}

.metric-wrap{margin-top:40px}
.metric-wrap h3{font-size:14px;font-weight:600;color:var(--ink);margin-bottom:14px}
.metric-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;
}
table.metric{width:100%;border-collapse:collapse;table-layout:fixed}
table.metric th,table.metric td{text-align:left;padding:14px 20px;font-size:13px;line-height:1.6}
table.metric th{
  font-weight:600;font-size:12px;letter-spacing:.06em;color:var(--gray);
  background:var(--cream);border-bottom:1px solid var(--line);
}
table.metric td{color:var(--gray);border-top:1px solid var(--line)}
table.metric tbody tr:first-child td{border-top:0}
table.metric td.k{font-weight:600;color:var(--ink);white-space:nowrap}
table.metric td[data-th]::before{content:none}

.terms{margin-top:32px;display:flex;flex-direction:column;gap:8px}
.terms .line1{font-size:13px;color:var(--gray)}
.terms .line2{font-size:13px;color:var(--gray);line-height:1.7}
.terms .line3{font-size:12px;color:var(--gray);padding-top:12px;border-top:1px solid var(--line)}

/* ---------- 3.9 创始团队 / 3.10 关于萃见（editorial 双栏） ---------- */
.editorial{display:flex;gap:64px;align-items:flex-start}
.editorial .col-left{flex:0 0 400px}
.editorial .col-right{flex:1 1 auto;min-width:0}
.col-left h2{margin-bottom:20px}
.col-left .note-line{font-size:13px;color:var(--gray);margin-top:6px}
.col-left .note-line+.note-line{margin-top:6px}

.founder{display:flex;gap:20px;align-items:flex-start;padding:24px 0}
.founder:first-child{padding-top:8px}
.founder:last-child{padding-bottom:8px}
.founder+.founder{border-top:1px solid var(--line)}
.avatar{flex:0 0 56px;width:56px;height:56px;display:block}
.avatar img{display:block;width:100%;height:100%}
.founder .meta{display:flex;flex-direction:column;gap:6px;min-width:0}
.founder .who{font-family:var(--f-title);font-size:17px;font-weight:600;color:var(--ink)}
.founder .dim{
  font-family:var(--f-body);font-size:12px;font-weight:600;
  letter-spacing:.08em;color:var(--primary);margin-top:-2px;
}
.founder .bio{font-size:14px;color:var(--gray)}
.founder .cap{font-size:13px;color:var(--gray);padding-top:2px}
.founder .cap .cap-k{color:var(--primary);font-weight:600}

.stance{font-size:16px;color:var(--ink)}
.origin{font-size:15px;color:var(--gray);margin-top:20px}

/* ---------- 3.11 预约诊断 ---------- */
.contact{background:var(--primary);padding:72px var(--pad-x)}
.contact-inner{max-width:1280px;margin:0 auto;display:flex;gap:48px;align-items:center;flex-wrap:wrap}
.contact-copy{flex:1 1 380px;display:flex;flex-direction:column;gap:12px}
.contact-copy h2{font-size:32px;color:#fff}
.contact-copy p{font-size:15px;color:var(--on-dark)}
/* 视觉取自原始原型；接口与提交状态由当前预约脚本处理。 */
.lead-form{flex:1 1 460px;display:grid;gap:16px;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;align-items:end}
.lead-field{display:grid;gap:8px;min-width:0}
.lead-field label{font-size:13px;font-weight:600;color:#fff}
.lead-form input[type=text],.lead-form select{
  width:100%;box-sizing:border-box;min-height:48px;
  font-family:var(--f-body);font-size:14px;color:var(--ink);
  background:#fff;border:1px solid transparent;border-radius:8px;padding:12px 16px;
}
.lead-form input::placeholder{color:var(--gray)}
.lead-industry{grid-column:1/-1;max-width:360px;width:100%;min-width:0}
.lead-form select{height:48px}
.lead-form select{
  width:100%;height:48px;
  font-family:var(--f-body);font-size:14px;color:var(--ink);
  background:#fff;border:1px solid transparent;border-radius:8px;
  padding:12px 16px;
}
.lead-form input::placeholder{color:var(--gray)}
.lead-industry{grid-column:1/-1;max-width:360px;width:100%;min-width:0}
.lead-form select{
  appearance:none;color-scheme:light;cursor:pointer;
  border-color:var(--line);padding-right:48px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235C6B66' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 16px center;background-size:16px;
  transition:border-color .15s ease,box-shadow .15s ease;
}
.lead-form select:invalid{color:var(--gray)}
.lead-form select option{color:var(--ink)}
.lead-form select:hover:not(:disabled){border-color:var(--green-ink)}
.lead-form select:focus{border-color:var(--green-ink);box-shadow:0 0 0 3px rgba(255,255,255,.18)}
.lead-form select:disabled{cursor:not-allowed;background-color:var(--cream);color:var(--gray)}
/* The native select remains the fallback and the touch picker. No JS combobox state. */
@supports (appearance:base-select){
  @media (min-width:641px) and (hover:hover) and (pointer:fine){
    .lead-form select,.lead-form select::picker(select){appearance:base-select}
    .lead-form select{display:flex;align-items:center;gap:12px;background-image:none;padding-right:16px}
    .lead-form select::picker-icon{
      content:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235C6B66' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
      width:16px;height:16px;flex:none;margin-left:auto;transition:transform .15s ease;
    }
    .lead-form select:open::picker-icon{transform:rotate(180deg)}
    .lead-form select::picker(select){
      font:inherit;color:var(--ink);background:#fff;border:1px solid var(--line);
      border-radius:12px;padding:6px;margin-block:8px;max-height:280px;
      box-shadow:0 8px 24px rgba(15,29,25,.14);overflow-y:auto;overscroll-behavior:contain;
    }
    .lead-form select option{
      display:flex;align-items:center;gap:12px;min-height:44px;
      padding:10px 12px;border:0;border-radius:6px;font-size:14px;cursor:pointer;
    }
    .lead-form select option[value=""]{display:none}
    .lead-form select option:hover,.lead-form select option:focus-visible{background:var(--tint);outline:none}
    .lead-form select option:checked{background:var(--tint);color:var(--green-ink);font-weight:600}
    .lead-form select option::checkmark{order:1;margin-left:auto;color:var(--green-ink)}
  }
}
@media (forced-colors:active){
  .lead-form select{appearance:auto;background-image:none;border-color:ButtonText}
  .lead-form select:focus{box-shadow:none;outline:2px solid Highlight;outline-offset:2px}
}
.lead-form button{
  grid-column:3;grid-row:1;
  font-family:var(--f-body);font-size:15px;font-weight:600;color:#fff;
  background:var(--green);border:0;border-radius:8px;
  padding:0 28px;min-height:48px;cursor:pointer;white-space:nowrap;
}
.lead-form button:hover:not(:disabled){background:#26a67b}
.lead-form button:disabled{cursor:wait;opacity:.7}
.lead-privacy{grid-column:1/-1;margin:0;font-size:13px;line-height:1.6;color:var(--on-dark)}
.lead-feedback{grid-column:1/-1;margin:0;font-size:14px;font-weight:600;line-height:1.6;color:#fff}
.lead-feedback{overflow-wrap:anywhere}
.lead-form noscript{grid-column:1/-1}
.lead-feedback:empty{display:none}
.lead-form :focus-visible{outline:2px solid #fff;outline-offset:3px}

/* ---------- 3.12 页脚 ---------- */
.footer{
  background:var(--ink);color:#fff;
  padding:64px var(--pad-x) 30px;
  border-top:1px solid rgba(255,255,255,.16);
}
.footer-inner{max-width:1280px;margin:0 auto}
.footer-top{
  display:grid;grid-template-columns:minmax(300px,1.2fr) auto;
  gap:48px;padding-bottom:44px;
}
.footer-brand{display:flex;flex-direction:column;gap:18px;max-width:520px}
.footer-brand img{width:132px;height:auto}
.footer-desc{font-size:13px;line-height:1.7;color:rgba(255,255,255,.78)}
.footer-contact{font-size:13px;line-height:1.7;color:rgba(255,255,255,.78)}
.footer-contact a{color:rgba(255,255,255,.78)}
.footer-contact a:hover{color:var(--bamboo);text-decoration:none}
.footer-cols{display:grid;grid-template-columns:repeat(2,auto);gap:52px;justify-content:end}
.footer-col{display:flex;flex-direction:column;gap:14px}
.footer-col h3{font-size:12px;font-weight:600;letter-spacing:.1em;color:rgba(255,255,255,.52)}
.footer-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.footer-col a{font-size:14px;color:rgba(255,255,255,.78)}
.footer-col a:hover{color:var(--bamboo);text-decoration:none}
.footer-platforms{
  display:flex;align-items:center;gap:14px 28px;flex-wrap:wrap;
  padding:22px 0;
  border-bottom:1px solid var(--dark-line);
}
.footer-platforms .fnote{margin-left:auto;font-size:12px;color:rgba(255,255,255,.7)}
.footer-platforms .flabel{flex:0 0 auto;font-size:12px;letter-spacing:.06em;color:rgba(255,255,255,.45)}
.footer-chips{display:flex;flex-wrap:wrap;gap:8px}
.footer-chips span{
  font-size:12px;color:rgba(255,255,255,.78);white-space:nowrap;
  border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:5px 13px;
}
.footer-bottom{
  padding-top:24px;
  display:flex;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;
}
.footer-bottom p{font-size:12px;color:rgba(255,255,255,.5)}
.footer-bottom address{font-style:normal;margin:0}
.footer-bottom .en{font-family:var(--f-en);color:rgba(255,255,255,.5)}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:-9999px;top:0;background:var(--green);color:#fff;
  padding:10px 16px;border-radius:0 0 8px 0;z-index:60;font-size:14px;
}
.skip-link:focus{left:0}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  :root{--pad-x:48px;--nav-x:32px;--nav-shift:0px}
  h1{font-size:46px}
  h2{font-size:34px}
  .plat-cards.g6{grid-template-columns:repeat(3,1fr)}
  .sys-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .editorial{gap:40px}
  .editorial .col-left{flex:0 0 320px}
  .footer-top{grid-template-columns:1fr;gap:40px}
  .footer-brand{max-width:640px}
}
/* 单行至少需要 ~890px（logo 158 + 5 项锚点 401 + 右侧 208 + 左右留白 80），
   920 以下一律折行。折行而非汉堡：GEO 要求站内锚点在初始 HTML 里可抓取 */
@media (max-width:920px){
  :root{--sticky-h:104px}
  .nav-inner{flex-wrap:wrap;gap:14px}
  .nav-links{order:3;width:100%;gap:20px;overflow-x:auto;padding-bottom:2px;margin-left:0}
  .nav-right{margin-left:auto}
}
@media (max-width:834px){
  :root{--pad-x:28px;--nav-x:20px;--sticky-h:104px}
  /* §4.3 字级梯度：<=834 只降 h1 / h2；h3（卡片标题）与正文字段维持 21 / 17 不递减 */
  h1{font-size:36px}
  h2{font-size:28px}
  .section{padding:64px var(--pad-x)}
  .hero{padding:72px var(--pad-x) 64px}
  .contact{padding:56px var(--pad-x)}
  /* 网格降列只在 1180 / 640 / 380 三档发生（PRD 6.1）；
     834 档只改字号、留白与双栏 editorial，不动网格列数 */
  .path-steps{flex-direction:column;gap:14px}
  .arrow{transform:rotate(90deg)}
  .closing{font-size:19px}
  .editorial{flex-direction:column;gap:28px}
  .editorial .col-left{flex:1 1 auto;width:100%}
  /* 指标表在 641–834 区间列宽变窄，收紧单元格内边距避免「指定信息正确率」超出列宽 */
  table.metric th,table.metric td{padding:12px 14px}
  .contact-inner{gap:28px}
  /* 预约表单在 ≤834 落到文案下方整行，避免 3 列被压窄 */
  .lead-form{flex-basis:100%}
}
@media (max-width:640px){
  :root{--pad-x:20px;--sticky-h:128px}
  h1{font-size:30px}
  h2{font-size:24px}
  .brand img{height:24px}
  /* 手机端收紧：右侧两项不内部折行（否则 logo 行 + 右侧两行 + 链接行 = 152px 高的吸顶条） */
  .nav-inner{gap:10px 14px}
  .nav-right{flex:0 0 auto;min-width:0;flex-wrap:nowrap;justify-content:flex-end;gap:8px}
  .nav-right a.txt-link{font-size:12px}
  .btn-sm{font-size:12px;padding:7px 14px}
  .nav-links{gap:12px}
  /* 网格降列（PRD 6.1）：≤640 → 双栏/三列/四列一律收为单列，平台卡收为两列 */
  .concept-grid{grid-template-columns:1fr}
  .lapse-grid{grid-template-columns:1fr}
  .sys-grid{grid-template-columns:1fr}
  .adv-grid{grid-template-columns:1fr}
  .plan-grid{grid-template-columns:1fr}
  .plat-cards.g6{grid-template-columns:repeat(2,1fr)}
  .footer-cols{grid-template-columns:repeat(2,1fr);gap:26px 24px;justify-content:start}
  .trust{font-size:12px}
  .concept{padding:26px 22px}
  .concept .quote{font-size:20px}
  .lapse-lead{font-size:16px}
  .lapse-lead .pct{font-size:30px}
  /* 指标表在窄屏转为「一行一卡」堆叠，避免 3 列挤压 */
  table.metric{table-layout:auto}
  table.metric thead{
    position:absolute;width:1px;height:1px;padding:0;margin:-1px;
    overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
  }
  table.metric,table.metric tbody,table.metric tr,table.metric td{display:block;width:auto}
  table.metric tr{padding:16px 20px;border-top:1px solid var(--line)}
  table.metric tr:first-child{border-top:0}
  table.metric td{padding:2px 0;border:0}
  table.metric td.k{font-size:15px;margin-bottom:6px}
  table.metric td[data-th]::before{content:attr(data-th) "：";color:var(--gray);font-weight:600}
  /* 手机端表单收为单列，字段整行撑满 */
  .lead-form{grid-template-columns:minmax(0,1fr);flex-basis:100%}
  .lead-industry{max-width:none}
  .lead-form select{font-size:16px}
  .lead-form button{grid-column:auto;grid-row:auto;width:100%;order:3}
  .lead-privacy,.lead-feedback{order:4}
  .footer{padding:34px var(--pad-x) 22px}
  .footer-top{gap:30px;padding-bottom:34px}
  .footer-brand{gap:14px}
  .footer-platforms{padding:16px 0}
  .footer-platforms .fnote{margin-left:0}
  .footer-bottom{padding-top:18px}
}
@media (max-width:380px){
  .brand img{height:22px}
  .nav-links{gap:10px}
  .nav-links a{font-size:12px}
  .plat-cards.g6{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
html{scroll-behavior:smooth;scroll-padding-top:var(--sticky-h)}