/* =============================================================
   portal-website.html 专属样式 —— 深底大标题+子导航首屏 + 树状架构图
   ============================================================= */

/* ---------- 首屏 ---------- */
.pt-hero{
  background:var(--dark);color:#D8D2C6;
  padding:calc(var(--topbar-h) + var(--header-h) + 90px) 0 0;
}
.pt-kicker{font-size:12.5px;letter-spacing:.45em;color:var(--earth-light);margin-bottom:24px}
.pt-title{font-size:clamp(34px,5vw,58px);line-height:1.35;color:#F7F2E9;margin-bottom:24px}
.pt-title span{color:var(--earth-light)}
.pt-sub{font-size:15.5px;line-height:2;color:#B0A896;max-width:640px;margin-bottom:32px}
.pt-hero-actions{margin-bottom:60px}

/* 子栏目导航条 */
.pt-subnav{border-top:1px solid rgba(201,193,178,.15)}
.pt-subnav-inner{
  display:flex;gap:8px;overflow-x:auto;padding:16px 0;
}
.pt-subnav a{
  flex:none;font-size:13.5px;letter-spacing:.08em;color:#B0A896;
  padding:8px 18px;border:1px solid rgba(201,193,178,.25);border-radius:20px;
  transition:all .3s ease;
}
.pt-subnav a:hover{color:#fff;border-color:var(--earth);background:rgba(174,135,73,.15)}

/* ---------- 谁需要 ---------- */
.pt-who-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.pt-who-grid>div{
  padding:28px 24px;background:var(--paper);border:1px solid var(--line);
  border-top:3px solid var(--brown);
}
.pt-who-grid h3{font-size:17px;margin-bottom:8px}
.pt-who-grid p{font-size:13.5px;color:var(--ink-soft);line-height:1.85}

/* ---------- 树状架构 ---------- */
.pt-arch{margin-top:0}
.pt-tree{max-width:960px;margin:0 auto;text-align:center}
.pt-tree-root{
  display:inline-block;padding:12px 34px;background:var(--dark);color:#EFE9DC;
  font-family:var(--font-serif);font-size:17px;letter-spacing:.15em;margin-bottom:34px;position:relative;
}
.pt-tree-root::after{
  content:"";position:absolute;left:50%;bottom:-24px;width:1px;height:24px;background:var(--line-strong);
}
.pt-tree-branches{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:left}
.pt-tree-branch{
  background:var(--paper);border:1px solid var(--line);padding:22px 22px;
}
.pt-tree-branch h4{
  font-size:15px;color:var(--earth-deep);padding-bottom:10px;margin-bottom:12px;
  border-bottom:1px dashed var(--line);letter-spacing:.1em;
}
.pt-tree-branch li{font-size:13.5px;color:var(--ink-soft);padding:5px 0 5px 14px;position:relative}
.pt-tree-branch li::before{content:"";position:absolute;left:0;top:12px;width:8px;height:1px;background:var(--brown-light)}
.pt-arch-note{margin-top:30px;font-size:14px;color:var(--ink-soft);max-width:720px;margin-left:auto;margin-right:auto}

/* ---------- 子栏目管理 ---------- */
.pt-admin-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.pt-admin-copy .lead{margin:14px 0 20px}
.pt-admin-list li{display:flex;gap:12px;font-size:14.5px;color:var(--ink-soft);margin-bottom:16px;line-height:1.8}
.pt-admin-list svg{width:17px;height:17px;fill:var(--earth);flex:none;margin-top:4px}
.pt-admin-photo img{width:100%;box-shadow:var(--shadow)}

/* ---------- 站群（深色） ---------- */
.pt-group{margin-top:0}
.pt-group-desc{color:#B0A896}
.pt-group-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.pt-group-grid>div{
  padding:26px 24px;border:1px solid rgba(201,193,178,.2);background:rgba(243,239,231,.05);
}
.pt-group-grid h3{font-size:17px;color:#EFE9DC;margin-bottom:8px}
.pt-group-grid p{font-size:13.5px;color:#B0A896;line-height:1.85}
.pt-group-grid a{color:var(--earth-light);border-bottom:1px dashed rgba(201,169,104,.5)}

/* ---------- 发布流程 ---------- */
.pt-pub-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-left:1px solid var(--line)}
.pt-pub-steps>div{padding:26px 24px;border-right:1px solid var(--line)}
.pt-pub-steps span{font-family:var(--font-serif);font-size:28px;color:var(--earth-light);display:block;margin-bottom:10px}
.pt-pub-steps h3{font-size:17px;margin-bottom:8px}
.pt-pub-steps p{font-size:13.5px;color:var(--ink-soft);line-height:1.85}

/* ---------- 案例 ---------- */
.pt-case{margin-top:0}
.pt-case-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.pt-case-card{background:var(--paper);border:1px solid var(--line);overflow:hidden;display:block}
.pt-case-card img{width:100%;height:230px;object-fit:cover}
.pt-case-body{padding:22px 26px 26px}
.pt-case-body h3{font-size:19px;margin:12px 0 8px}
.pt-case-body p{font-size:14px;color:var(--ink-soft);line-height:1.85}

/* ---------- 安全 ---------- */
.pt-sec-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center}
.pt-sec-photo img{width:100%;box-shadow:var(--shadow)}
.pt-sec-copy p{font-size:14.5px;color:var(--ink-soft);line-height:2;margin-bottom:14px}
.pt-sec-copy a{color:var(--earth-deep);border-bottom:1px dashed var(--earth)}

/* ---------- FAQ ---------- */
.pt-faq-wrap{max-width:860px}
.pt-faq .section-head{margin-bottom:34px}
.pt-faq .accordion-body a{color:var(--earth-deep);border-bottom:1px dashed var(--earth)}

/* ---------- CTA ---------- */
.pt-cta{background:var(--paper-deep);padding:96px 0;text-align:center}
.pt-cta-inner h2{font-size:clamp(26px,3.4vw,38px);line-height:1.5;margin-bottom:30px}
.pt-cta-row{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-bottom:34px}
.pt-cta-row a{display:inline-flex;align-items:center;gap:8px;font-size:15px;color:var(--ink-soft)}
.pt-cta-row svg{width:16px;height:16px;fill:var(--earth)}

/* ---------- 响应式 ---------- */
@media (max-width:991px){
  .pt-who-grid{grid-template-columns:1fr 1fr}
  .pt-tree-branches{grid-template-columns:1fr 1fr}
  .pt-admin-wrap,.pt-sec-wrap{grid-template-columns:1fr;gap:30px}
  .pt-group-grid,.pt-pub-steps{grid-template-columns:1fr 1fr}
  .pt-case-grid{grid-template-columns:1fr}
}
@media (max-width:720px){
  .pt-who-grid,.pt-tree-branches,.pt-group-grid,.pt-pub-steps{grid-template-columns:1fr}
}