/* roulang page: index */
:root{
  --brand:#1B4CD8;
  --brand-dark:#1640B8;
  --brand-soft:#EEF3FF;
  --accent:#FF6A2B;
  --bg:#F7F9FC;
  --card:#FFFFFF;
  --text:#16203A;
  --text-2:#4A5670;
  --text-3:#7C879E;
  --border:#E3E9F5;
  --border-strong:#D8E0EE;
  --success:#12A150;
  --warn:#E0A400;
  --danger:#D93A3A;
  --radius-card:14px;
  --radius-btn:10px;
  --shadow-card:0 1px 2px rgba(20,35,80,.06),0 8px 24px rgba(20,35,80,.06);
  --shadow-hover:0 12px 32px rgba(20,35,80,.12);
  --max:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand);text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.3;font-weight:700}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
.num{font-family:"DIN Alternate","Roboto Mono",ui-monospace,SFMono-Regular,monospace;font-variant-numeric:tabular-nums}

.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--radius-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1.2;cursor:pointer;
  transition:background-color .25s ease,color .25s ease,border-color .25s ease,transform .25s ease,box-shadow .25s ease;
  min-height:46px;white-space:nowrap;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 16px rgba(27,76,216,.22)}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 10px 24px rgba(27,76,216,.28)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{background:transparent;color:var(--brand);border-color:var(--brand)}
.btn-outline:hover{background:var(--brand-soft);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--text-2);border-color:var(--border-strong)}
.btn-ghost:hover{color:var(--brand);border-color:var(--brand);background:var(--brand-soft)}
.btn-lg{padding:14px 30px;font-size:16px}
.btn-block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}

/* ---------- 徽章 ---------- */
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:.2px;white-space:nowrap;
}
.badge-brand{background:var(--brand-soft);color:var(--brand)}
.badge-success{background:#E7F7EE;color:var(--success)}
.badge-warn{background:#FCF3DC;color:#A97A00}
.badge-neutral{background:#EFF2F8;color:var(--text-2)}

/* ---------- 头部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;background:#fff;
  border-bottom:1px solid transparent;transition:box-shadow .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{border-bottom-color:var(--border);box-shadow:0 6px 20px rgba(20,35,80,.07)}
.header-inner{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:36px;height:36px;border-radius:10px;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;
  box-shadow:0 6px 14px rgba(27,76,216,.28);
}
.brand-text{font-size:17px;font-weight:700;color:var(--text);letter-spacing:.2px}
.main-nav{display:flex;align-items:center;gap:6px;margin-left:12px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;height:40px;padding:0 12px;
  color:var(--text-2);font-size:15px;font-weight:500;border-radius:8px;
  transition:color .2s ease,background-color .2s ease;
}
.nav-link:hover{color:var(--brand);background:var(--brand-soft)}
.nav-link.is-active{color:var(--brand);font-weight:700}
.nav-link.is-active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;border-radius:2px;background:var(--brand);
}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--border-strong);background:#fff;
  border-radius:10px;cursor:pointer;align-items:center;justify-content:center;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);position:relative;border-radius:2px}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text);border-radius:2px;
  transition:transform .2s ease;
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

/* 移动抽屉 */
.mobile-drawer{
  position:fixed;inset:0;z-index:80;background:#fff;display:none;flex-direction:column;
  padding:0 0 24px;
}
.mobile-drawer.is-open{display:flex}
.drawer-head{display:flex;align-items:center;justify-content:space-between;height:64px;padding:0 20px;border-bottom:1px solid var(--border)}
.drawer-close{width:44px;height:44px;border:1px solid var(--border-strong);border-radius:10px;background:#fff;cursor:pointer;font-size:20px;line-height:1;color:var(--text-2)}
.drawer-nav{display:flex;flex-direction:column;padding:8px 20px 0}
.drawer-link{
  display:flex;align-items:center;height:52px;border-bottom:1px solid var(--border);
  color:var(--text-2);font-size:16px;font-weight:500;position:relative;
}
.drawer-link.is-active{color:var(--brand);font-weight:700}
.drawer-link.is-active::before{
  content:"";position:absolute;left:-20px;top:12px;bottom:12px;width:3px;border-radius:0 3px 3px 0;background:var(--brand);
}
.drawer-foot{margin-top:auto;padding:20px;display:flex;flex-direction:column;gap:12px}

/* ---------- 通用板块 ---------- */
.section{padding:96px 0}
.section-alt{background:#fff}
.section-head{max-width:760px;margin-bottom:48px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:1.2px;
  color:var(--brand);text-transform:uppercase;margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:2px;border-radius:2px;background:var(--accent)}
.section-head h2{font-size:32px;margin-bottom:16px}
.section-desc{color:var(--text-2);font-size:16px}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,#F7F9FC 0%,#EEF3FF 100%);
  padding:88px 0 96px;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(27,76,216,.05) 0 1px,transparent 1px 88px);
}
.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-copy h1{font-size:44px;line-height:1.25;margin-bottom:20px}
.hero-sub{font-size:17px;color:var(--text-2);max-width:560px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}
.trust-list{display:flex;flex-wrap:wrap;gap:10px 20px;border-top:1px solid var(--border);padding-top:22px}
.trust-list li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-2);font-weight:500}
.trust-list li::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0;
}
.hero-media{position:relative}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:18px;
  box-shadow:0 24px 48px rgba(20,35,80,.16);background:#EDF1F9;
}
.hero-float{
  position:absolute;left:-18px;bottom:28px;background:#fff;border-radius:14px;
  padding:16px 20px;box-shadow:var(--shadow-hover);border:1px solid var(--border);
  display:flex;flex-direction:column;gap:2px;min-width:170px;
}
.float-label{font-size:13px;color:var(--text-3)}
.float-num{font-size:26px;font-weight:700;color:var(--brand);line-height:1.1}
.float-note{font-size:12px;color:var(--text-3)}

/* ---------- 指标看板 ---------- */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);
  padding:26px 24px;box-shadow:var(--shadow-card);
  transition:transform .25s ease,box-shadow .25s ease;
}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.stat-label{font-size:14px;color:var(--text-3);margin-bottom:12px}
.stat-value{font-size:40px;font-weight:700;color:var(--brand);line-height:1.1;margin-bottom:10px}
.stat-card:nth-child(odd) .stat-value{color:var(--accent)}
.stat-note{font-size:13px;color:var(--text-2)}

/* ---------- 服务矩阵 ---------- */
.matrix-grid{display:grid;grid-template-columns:4fr 8fr;gap:40px;align-items:start}
.matrix-list{display:flex;flex-direction:column;gap:8px}
.matrix-item{
  display:flex;gap:16px;padding:18px 18px;border-radius:var(--radius-card);
  background:var(--card);border:1px solid var(--border);
  transition:border-color .25s ease,transform .25s ease,box-shadow .25s ease;
}
.matrix-item:hover{border-color:#C9D6F5;transform:translateX(4px);box-shadow:var(--shadow-card)}
.matrix-no{
  font-family:"DIN Alternate","Roboto Mono",ui-monospace,monospace;
  font-size:15px;font-weight:700;color:var(--brand);flex-shrink:0;padding-top:2px;
}
.matrix-item h3{font-size:17px;margin-bottom:6px}
.matrix-item p{font-size:14px;color:var(--text-2);line-height:1.7}
.matrix-panel{
  background:var(--card);border:1px solid var(--border);border-radius:18px;overflow:hidden;
  box-shadow:var(--shadow-card);
}
.matrix-panel img{width:100%;aspect-ratio:16/10;object-fit:cover;background:#EDF1F9}
.panel-body{padding:26px 28px}
.panel-body h3{font-size:22px;margin-bottom:12px}
.panel-body p{color:var(--text-2);font-size:15px;margin-bottom:18px}
.panel-points{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;border-top:1px solid var(--border);padding-top:18px}
.panel-points li{font-size:14px;color:var(--text-2)}
.panel-points strong{display:block;font-size:15px;color:var(--text);margin-bottom:4px}

/* ---------- 结果对比 ---------- */
.compare-wrap{
  background:var(--card);border:1px solid var(--border);border-radius:18px;overflow:hidden;
  box-shadow:var(--shadow-card);
}
.compare-table{width:100%;border-collapse:collapse}
.compare-table thead th{
  position:sticky;top:72px;background:#F4F7FE;color:var(--text-2);font-size:14px;font-weight:700;
  text-align:left;padding:18px 24px;border-bottom:1px solid var(--border);
}
.compare-table thead th:nth-child(3){color:var(--brand)}
.compare-table td{padding:18px 24px;border-bottom:1px solid var(--border);font-size:15px;vertical-align:middle}
.compare-table tbody tr:last-child td{border-bottom:0}
.compare-table tbody tr:hover{background:#FAFBFE}
.compare-table .dim{font-weight:600;color:var(--text);width:20%}
.compare-table .old{color:var(--text-3);width:34%}
.compare-table .new{color:var(--text);width:46%}
.compare-table .new .badge{margin-right:10px}

/* ---------- 最新信息 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);
  overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-card);
  transition:transform .25s ease,box-shadow .25s ease;
}
.news-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.news-cover{display:block;background:#EDF1F9}
.news-cover img{width:100%;aspect-ratio:16/10;object-fit:cover}
.news-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:12px;flex:1}
.news-title{font-size:18px;line-height:1.5;font-weight:600}
.news-title a{color:var(--text);transition:color .2s ease}
.news-card:hover .news-title a{color:var(--brand)}
.news-excerpt{
  font-size:14px;color:var(--text-2);line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{
  margin-top:auto;display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--text-3);border-top:1px solid var(--border);padding-top:14px;
}
.news-meta .more{font-weight:600;color:var(--brand)}
.empty-state{
  background:var(--card);border:1px dashed var(--border-strong);border-radius:18px;
  padding:56px 24px;text-align:center;
}
.empty-icon{
  width:48px;height:48px;margin:0 auto 16px;border:2px solid var(--border-strong);border-radius:12px;
  display:flex;align-items:center;justify-content:center;color:var(--text-3);font-size:22px;
}
.empty-state p{color:var(--text-2);margin-bottom:10px}

/* ---------- 场景 ---------- */
.scenes-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.scene-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);
  padding:24px;box-shadow:var(--shadow-card);transition:transform .25s ease,box-shadow .25s ease;
}
.scene-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.scene-icon{
  width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;margin-bottom:16px;
}
.scene-card h3{font-size:18px;margin-bottom:8px}
.scene-card p{font-size:14px;color:var(--text-2);line-height:1.7}
.scene-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:900px}
.faq-item{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);
  margin-bottom:14px;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;
}
.faq-item[open]{border-color:#C9D6F5;box-shadow:var(--shadow-card)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  font-size:18px;font-weight:600;padding:20px 24px;cursor:pointer;list-style:none;
}
.faq-q::-webkit-details-marker{display:none}
.faq-q::after{
  content:"+";font-size:22px;font-weight:400;color:var(--brand);line-height:1;flex-shrink:0;
  transition:transform .2s ease;
}
.faq-item[open] .faq-q::after{content:"−"}
.faq-a{padding:0 24px 22px;color:var(--text-2);font-size:16px;line-height:1.8;max-width:820px}

/* ---------- 转化表单 ---------- */
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:32px;align-items:start}
.form-card{
  background:var(--card);border:1px solid var(--border);border-radius:18px;
  padding:32px;box-shadow:var(--shadow-card);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{margin-bottom:20px}
.field-label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}
.req{color:var(--danger);margin-left:2px}
.input,.select,.textarea{
  width:100%;min-height:46px;padding:11px 14px;border:1px solid var(--border-strong);
  border-radius:var(--radius-btn);background:#fff;color:var(--text);
  transition:border-color .2s ease,box-shadow .2s ease;
}
.textarea{min-height:118px;resize:vertical;line-height:1.7}
.input:focus,.select:focus,.textarea:focus{
  border-color:var(--brand);box-shadow:0 0 0 3px rgba(27,76,216,.14);outline:none;
}
.field.has-error .input,.field.has-error .select,.field.has-error .textarea{border-color:var(--danger)}
.error-text{display:none;font-size:13px;color:var(--danger);margin-top:6px}
.field.has-error .error-text{display:block}
.form-alert{
  display:none;align-items:center;gap:10px;background:#E7F7EE;color:#0E7F40;
  border:1px solid #B7E6CA;border-radius:var(--radius-btn);padding:12px 16px;font-size:14px;margin-bottom:20px;
}
.form-alert.is-visible{display:flex}
.form-actions{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.form-note{font-size:13px;color:var(--text-3)}
.contact-aside{
  background:#fff;border:1px solid var(--border);border-radius:18px;padding:30px;
  box-shadow:var(--shadow-card);
}
.contact-aside h3{font-size:22px;margin-bottom:12px}
.contact-aside > p{color:var(--text-2);font-size:15px;margin-bottom:22px}
.aside-list{display:flex;flex-direction:column;gap:16px;margin-bottom:24px}
.aside-list li{display:flex;gap:12px;font-size:15px;color:var(--text-2)}
.aside-list li strong{color:var(--text);display:block;font-size:15px;margin-bottom:2px}
.aside-dot{
  width:24px;height:24px;border-radius:50%;background:var(--brand-soft);color:var(--brand);
  font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:3px;
}
.aside-contact{border-top:1px solid var(--border);padding-top:20px;font-size:14px;color:var(--text-2)}
.aside-contact span{display:block;margin-bottom:6px}

/* ---------- 页脚 ---------- */
.site-footer{background:#101A33;color:#C6CEE0;padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-mark{background:var(--brand)}
.footer-brand .brand-text{color:#fff;font-size:17px;font-weight:700}
.footer-col p{font-size:14px;line-height:1.8;color:#9AA6BF}
.footer-col h4{font-size:15px;color:#fff;margin-bottom:16px;font-weight:600}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{color:#9AA6BF;font-size:14px;transition:color .2s ease}
.footer-links a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:20px 0;font-size:13px;color:#8593AE;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
  .hero-copy h1{font-size:38px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .scenes-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:1023px){
  .main-nav,.header-actions .btn-ghost{display:none}
  .nav-toggle{display:flex}
  .header-actions .btn-primary{display:none}
  .hero{padding:64px 0 72px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-media img{aspect-ratio:16/10}
  .hero-float{left:16px;bottom:16px}
  .matrix-grid{grid-template-columns:1fr;gap:28px}
  .contact-grid{grid-template-columns:1fr}
  .section{padding:72px 0}
  .section-head h2{font-size:26px}
}
@media (max-width:767px){
  .container{padding:0 18px}
  .header-inner{height:56px}
  h1,.hero-copy h1{font-size:30px}
  .section-head h2{font-size:24px}
  .section{padding:56px 0}
  .section-head{margin-bottom:32px}
  .hero{padding:44px 0 56px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .stats-grid{grid-template-columns:1fr;gap:16px}
  .scenes-grid{grid-template-columns:1fr;gap:16px}
  .news-grid{grid-template-columns:1fr;gap:16px}
  .form-row{grid-template-columns:1fr;gap:0}
  .form-card,.contact-aside{padding:22px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .faq-q{font-size:16px;padding:18px 18px;min-height:52px}
  .faq-a{padding:0 18px 18px}
  .panel-points{grid-template-columns:1fr}
  .panel-body{padding:20px}
  .compare-table thead{display:none}
  .compare-table,.compare-table tbody,.compare-table tr,.compare-table td{display:block;width:100%}
  .compare-table tr{background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);padding:16px;margin:16px}
  .compare-table td{border:0;padding:6px 0}
  .compare-table td::before{
    content:attr(data-label);display:block;font-size:13px;color:var(--text-3);margin-bottom:4px;
  }
}
@media (max-width:519px){
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
  .stat-value{font-size:34px}
}
@media print{
  .site-header,.site-footer,.mobile-drawer,.form-actions,.hero-actions{display:none!important}
  body{background:#fff}
}

/* roulang page: article */
:root{
  --brand:#1B4CD8;
  --brand-dark:#163EAE;
  --brand-soft:#EEF3FF;
  --accent:#FF6A2B;
  --accent-soft:#FFF1EA;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --text:#101828;
  --text-2:#475467;
  --text-3:#8792A6;
  --border:#E3E9F5;
  --success:#12A150;
  --success-soft:#E7F7EE;
  --warn:#E0A400;
  --warn-soft:#FFF7E2;
  --error:#D93A3A;
  --error-soft:#FDECEC;
  --radius-card:14px;
  --radius-btn:10px;
  --radius-input:10px;
  --shadow-card:0 1px 2px rgba(20,35,80,.06),0 8px 24px rgba(20,35,80,.06);
  --shadow-hover:0 12px 32px rgba(20,35,80,.12);
  --mono:"DIN Alternate","Roboto Mono","SFMono-Regular",Menlo,Consolas,monospace;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --gap:24px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
}
img{max-width:100%;display:block;border:0}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--text)}
p{margin:0}
ul,ol{margin:0;padding:0}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid transparent;
  transition:box-shadow .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
  border-bottom-color:var(--border);
  box-shadow:0 4px 20px rgba(20,35,80,.06);
}
.header-inner{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:36px;height:36px;border-radius:11px;
  background:var(--brand);color:#fff;
  display:grid;place-items:center;
  font-size:16px;font-weight:700;letter-spacing:0;
}
.brand-text{font-size:17px;font-weight:700;color:var(--text);letter-spacing:.2px;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:12px}
.nav-link{
  position:relative;
  padding:10px 14px;border-radius:8px;
  font-size:15px;font-weight:500;color:var(--text-2);
  transition:color .2s ease,background-color .2s ease;
  white-space:nowrap;
}
.nav-link:hover{color:var(--brand);background:var(--brand-soft)}
.nav-link.is-active{color:var(--brand)}
.nav-link.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;
}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:12px 24px;
  border:1px solid transparent;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;
  transition:background-color .25s ease,color .25s ease,box-shadow .25s ease,transform .25s ease,border-color .25s ease;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(27,76,216,.24)}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-2px);box-shadow:0 10px 24px rgba(27,76,216,.28)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;color:var(--brand);border-color:rgba(27,76,216,.35)}
.btn-ghost:hover{background:var(--brand-soft);color:var(--brand-dark)}
.btn-sm{min-height:40px;padding:9px 18px;font-size:14px}
.btn-block{width:100%}

.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 10px;
  background:transparent;border:1px solid var(--border);border-radius:var(--radius-btn);
  cursor:pointer;
}
.nav-toggle span{display:block;height:2px;border-radius:2px;background:var(--text)}
.nav-toggle:hover{border-color:var(--brand)}
.nav-toggle:hover span{background:var(--brand)}

/* ---------- drawer ---------- */
.mobile-drawer{
  position:fixed;inset:0;z-index:90;
  background:#fff;
  display:flex;flex-direction:column;
  transform:translateX(100%);
  transition:transform .3s ease;
  visibility:hidden;
}
.mobile-drawer.is-open{transform:translateX(0);visibility:visible}
.drawer-head{
  height:64px;flex-shrink:0;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 20px;border-bottom:1px solid var(--border);
}
.drawer-close{
  width:44px;height:44px;border:1px solid var(--border);border-radius:var(--radius-btn);
  background:#fff;color:var(--text-2);font-size:20px;line-height:1;cursor:pointer;
}
.drawer-close:hover{color:var(--brand);border-color:var(--brand)}
.drawer-nav{display:flex;flex-direction:column;overflow-y:auto;padding:6px 0}
.drawer-nav a{
  display:flex;align-items:center;height:52px;padding:0 20px;
  font-size:16px;color:var(--text);
  border-bottom:1px solid var(--border);
}
.drawer-nav a:hover{color:var(--brand)}
.drawer-nav a.is-active{color:var(--brand);background:var(--brand-soft);box-shadow:inset 3px 0 0 var(--brand)}
.drawer-foot{margin-top:auto;padding:16px 20px 26px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:10px}
body.no-scroll{overflow:hidden}

/* ---------- article layout ---------- */
.page-intro{
  background:linear-gradient(180deg,#F7F9FC 0%,#EEF3FF 100%);
  border-bottom:1px solid var(--border);
  padding:32px 0 44px;
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--text-3);margin-bottom:24px}
.breadcrumb a{color:var(--text-2)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:#C3CDE0}
.breadcrumb .current{color:var(--text-3)}

.article-head{max-width:760px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--accent);
  background:var(--accent-soft);border-radius:999px;
  padding:5px 12px;margin-bottom:16px;
}
.article-head h1{
  font-size:44px;line-height:1.25;font-weight:700;letter-spacing:-.5px;
  margin-bottom:18px;
}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:14px;color:var(--text-3)}
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;
  border-radius:999px;font-size:12px;font-weight:600;line-height:1;
}
.badge-brand{background:var(--brand-soft);color:var(--brand)}
.badge-accent{background:var(--accent-soft);color:#D5521B}
.badge-success{background:var(--success-soft);color:var(--success)}
.badge-warn{background:var(--warn-soft);color:#B07E00}
.meta-dot{width:4px;height:4px;border-radius:50%;background:#C3CDE0}

.section{padding:64px 0}
.section-tight{padding-top:40px}

.article-body{
  max-width:760px;
  padding:48px 0 0;
  font-size:16px;line-height:1.85;color:var(--text-2);
}
.article-body > * + *{margin-top:20px}
.article-body h2{
  font-size:32px;line-height:1.3;color:var(--text);
  margin-top:44px;margin-bottom:16px;font-weight:700;
}
.article-body h3{
  font-size:22px;line-height:1.4;color:var(--text);
  margin-top:34px;margin-bottom:12px;font-weight:600;
}
.article-body h4{font-size:18px;color:var(--text);margin-top:26px;margin-bottom:10px}
.article-body p{color:var(--text-2)}
.article-body a{color:var(--brand);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--brand-dark)}
.article-body ul,.article-body ol{padding-left:22px;color:var(--text-2)}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin:8px 0}
.article-body strong{color:var(--text)}
.article-body blockquote{
  margin:26px 0;padding:16px 20px;
  border-left:3px solid var(--brand);
  background:var(--brand-soft);
  border-radius:0 var(--radius-card) var(--radius-card) 0;
  color:var(--text-2);
}
.article-body blockquote p{color:var(--text-2)}
.article-body img{border-radius:12px;margin:26px 0}
.article-body figcaption{font-size:13px;color:var(--text-3);text-align:center;margin-top:-12px}
.article-body code{
  font-family:var(--mono);font-size:14px;
  background:#F1F4FA;border-radius:6px;padding:2px 6px;color:#2B3A5C;
}
.article-body pre{
  background:#F1F4FA;border-radius:12px;padding:18px;
  overflow-x:auto;font-family:var(--mono);font-size:14px;line-height:1.7;
}
.article-body pre code{background:none;padding:0}
.article-body table{
  width:100%;border-collapse:collapse;font-size:15px;
  border:1px solid var(--border);border-radius:12px;overflow:hidden;
}
.article-body thead th{background:var(--brand-soft);color:var(--text);font-weight:600;text-align:left}
.article-body th,.article-body td{padding:12px 16px;border-bottom:1px solid var(--border)}
.article-body tbody tr:nth-child(even){background:#FAFBFE}
.article-body hr{border:0;border-top:1px solid var(--border);margin:34px 0}

.empty-state{
  max-width:760px;margin:0 auto;padding:48px 24px;text-align:center;
  background:var(--surface);border:1px dashed var(--border);
  border-radius:var(--radius-card);box-shadow:var(--shadow-card);
}
.empty-icon{
  width:48px;height:48px;margin:0 auto 16px;border-radius:12px;
  border:2px solid var(--border);display:grid;place-items:center;
  color:var(--text-3);font-size:20px;
}
.empty-state h2{font-size:22px;margin-bottom:8px}
.empty-state p{color:var(--text-3);font-size:14px;margin-bottom:18px}

/* ---------- tags & related ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;max-width:760px;margin-top:44px}
.tag-row .label{font-size:14px;color:var(--text-3);margin-right:4px}
.tag{
  display:inline-flex;align-items:center;height:28px;padding:0 14px;
  border-radius:999px;background:var(--surface);border:1px solid var(--border);
  font-size:13px;color:var(--text-2);transition:all .2s ease;
}
.tag:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}

.block-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px}
.block-head h2{font-size:32px;line-height:1.3}
.block-head p{margin-top:10px;font-size:15px;color:var(--text-3)}
.link-more{font-size:15px;font-weight:600;color:var(--brand)}
.link-more:hover{text-decoration:underline;text-underline-offset:4px}

.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-card);
  display:flex;flex-direction:column;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D3DDF0}
.card-media{position:relative;aspect-ratio:16/10;background:#EDF1F8;overflow:hidden}
.card-media img{width:100%;height:100%;object-fit:cover}
.card-media .badge{position:absolute;left:12px;top:12px;background:#fff;color:var(--brand);box-shadow:0 4px 12px rgba(20,35,80,.12)}
.card-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.card-body h3{font-size:18px;line-height:1.45;font-weight:600}
.card-body h3 a{color:var(--text)}
.card-body h3 a:hover{color:var(--brand)}
.card-body p{font-size:14px;line-height:1.6;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-3);padding-top:6px}

/* ---------- cta ---------- */
.cta-band{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);
  box-shadow:var(--shadow-card);
  padding:36px 40px;
  display:flex;align-items:center;justify-content:space-between;gap:28px;
}
.cta-band h2{font-size:26px;line-height:1.35;margin-bottom:10px}
.cta-band p{font-size:15px;color:var(--text-3);max-width:620px}
.cta-actions{display:flex;gap:12px;flex-shrink:0;flex-wrap:wrap}

/* ---------- footer ---------- */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:64px 0 0;margin-top:72px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:32px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand .brand-mark{width:32px;height:32px;border-radius:10px;font-size:15px}
.footer-brand .brand-text{font-size:16px;font-weight:700;color:var(--text)}
.footer-col p{font-size:14px;line-height:1.7;color:var(--text-3);max-width:360px}
.footer-col h4{font-size:15px;font-weight:600;margin-bottom:16px;color:var(--text)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a,.footer-links span{font-size:14px;color:var(--text-3)}
.footer-links a:hover{color:var(--brand)}
.footer-bottom{
  margin-top:48px;padding:20px 0;border-top:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  font-size:13px;color:var(--text-3);
}

@media (max-width:1024px){
  .main-nav{display:none}
  .header-actions .btn{display:none}
  .nav-toggle{display:flex}
  .header-inner{height:64px;gap:16px}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .article-head h1{font-size:34px}
  .cta-band{flex-direction:column;align-items:flex-start;padding:28px}
}
@media (max-width:768px){
  .container{padding:0 18px}
  .page-intro{padding:24px 0 34px}
  .article-head h1{font-size:28px;line-height:1.3}
  .section{padding:56px 0}
  .article-body{padding-top:32px;font-size:16px}
  .article-body h2{font-size:24px;margin-top:34px}
  .article-body h3{font-size:19px}
  .block-head{flex-direction:column;align-items:flex-start;gap:10px}
  .block-head h2{font-size:24px}
  .card-grid{grid-template-columns:1fr;gap:16px}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .site-footer{padding-top:48px;margin-top:52px}
}
@media (max-width:520px){
  .brand-text{font-size:15px}
  .article-head h1{font-size:25px}
  .btn{width:100%}
  .btn-sm{width:auto}
}
@media print{
  .site-header,.site-footer,.cta-band,.mobile-drawer,.tag-row,.block-related{display:none}
  .article-body{max-width:100%}
}

/* roulang page: category1 */
:root{
  --brand:#1B4CD8;
  --brand-dark:#1439A8;
  --brand-soft:#EEF3FF;
  --brand-line:rgba(27,76,216,.22);
  --accent:#FF6A2B;
  --accent-dark:#E2551B;
  --bg:#F7F9FC;
  --card:#FFFFFF;
  --text:#16213C;
  --text-mid:#4A5677;
  --text-weak:#7B87A6;
  --border:#E2E8F4;
  --input-border:#D8E0EE;
  --success:#12A150;
  --warn:#E0A400;
  --danger:#D93A3A;
  --r-card:14px;
  --r-btn:10px;
  --r-input:10px;
  --shadow-card:0 1px 2px rgba(20,35,80,.06),0 8px 24px rgba(20,35,80,.06);
  --shadow-hover:0 12px 32px rgba(20,35,80,.12);
  --container:1200px;
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:"DIN Alternate","Roboto Mono","SFMono-Regular",Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
body.is-locked{overflow:hidden}
img{max-width:100%;display:block;border:0}
a{color:var(--brand);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--brand-dark)}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;color:var(--text)}
h1{font-size:44px;line-height:1.25;font-weight:700;letter-spacing:-.5px}
h2{font-size:32px;line-height:1.3;font-weight:700}
h3{font-size:22px;line-height:1.4;font-weight:600}
p{margin:0}
ul,ol{margin:0;padding:0}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:70;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--border);
  transition:box-shadow .25s ease;
}
.site-header.is-scrolled{box-shadow:0 6px 22px rgba(20,35,80,.08)}
.header-inner{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{
  width:36px;height:36px;border-radius:11px;background:var(--brand);
  color:#fff;font-weight:700;font-size:18px;display:grid;place-items:center;
  box-shadow:0 6px 16px rgba(27,76,216,.28);
}
.brand-text{font-size:17px;font-weight:700;color:var(--text);letter-spacing:.2px;white-space:nowrap}
.brand:hover .brand-text{color:var(--brand)}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-link{
  position:relative;padding:9px 14px;border-radius:10px;
  font-size:15px;font-weight:500;color:var(--text-mid);
  transition:color .2s ease,background .2s ease;
}
.nav-link:hover{color:var(--brand);background:var(--brand-soft)}
.nav-link.is-active{color:var(--brand);font-weight:600;background:transparent}
.nav-link.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;
}
.header-actions{display:flex;align-items:center;gap:10px;flex:none}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--border);background:#fff;
  border-radius:var(--r-btn);cursor:pointer;flex-direction:column;
  align-items:center;justify-content:center;gap:4px;padding:0;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:12px 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1.2;border:1px solid transparent;
  cursor:pointer;white-space:nowrap;
  transition:background .22s ease,color .22s ease,border-color .22s ease,transform .22s ease,box-shadow .22s ease;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(27,76,216,.22)}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:0 10px 24px rgba(27,76,216,.26)}
.btn-outline{background:transparent;color:var(--brand);border-color:var(--brand-line)}
.btn-outline:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(255,106,43,.26)}
.btn-accent:hover{background:var(--accent-dark);color:#fff;transform:translateY(-1px)}
.btn-sm{min-height:40px;padding:9px 18px;font-size:14px}
.btn-link{background:none;border:0;padding:6px 0;color:var(--brand);font-weight:600;cursor:pointer;text-decoration:underline;text-underline-offset:4px}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}

/* ============ 移动抽屉 ============ */
.mobile-drawer{
  position:fixed;inset:0;z-index:95;background:#fff;
  display:flex;flex-direction:column;
  transform:translateX(100%);transition:transform .3s ease;visibility:hidden;
}
.mobile-drawer.is-open{transform:translateX(0);visibility:visible}
.drawer-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;border-bottom:1px solid var(--border);min-height:60px;
}
.drawer-close{
  width:44px;height:44px;border:1px solid var(--border);background:#fff;border-radius:var(--r-btn);
  font-size:22px;line-height:1;cursor:pointer;color:var(--text-mid);
}
.drawer-nav{display:flex;flex-direction:column;padding:8px 0;overflow-y:auto}
.drawer-nav a{
  display:flex;align-items:center;min-height:52px;padding:0 22px;
  color:var(--text-mid);font-size:16px;border-bottom:1px solid var(--border);
}
.drawer-nav a.is-active{color:var(--brand);font-weight:600;border-left:3px solid var(--brand);padding-left:19px;background:var(--brand-soft)}
.drawer-cta{margin-top:auto;padding:16px 20px 28px;border-top:1px solid var(--border)}
.drawer-cta .btn{width:100%}

/* ============ 页头区 ============ */
.page-hero{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,var(--bg) 0%,var(--brand-soft) 100%);
  padding:64px 0 72px;
}
.page-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(27,76,216,.05) 0 1px,transparent 1px 56px);
  opacity:.9;
}
.hero-grid{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:1.5px;
  color:var(--brand);text-transform:uppercase;font-weight:700;margin-bottom:16px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--brand);border-radius:2px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--text-weak);margin-bottom:20px}
.breadcrumb a{color:var(--text-mid)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:var(--text-weak)}
.breadcrumb .current{color:var(--text-weak)}
.hero-lead{margin-top:20px;font-size:17px;line-height:1.85;color:var(--text-mid);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-media{position:relative}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:18px;box-shadow:0 20px 48px rgba(20,35,80,.16);
  background:#E9EEF9;
}
.hero-badge{
  position:absolute;left:-14px;bottom:22px;
  display:inline-flex;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--border);border-radius:999px;
  padding:9px 18px;font-size:13px;font-weight:600;color:var(--text-mid);
  box-shadow:var(--shadow-card);
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}

/* ============ 通用板块 ============ */
.section{padding:88px 0}
.section + .section{padding-top:0}
.section-head{max-width:780px;margin-bottom:48px}
.section-head h2{margin-bottom:16px}
.section-head p{font-size:16px;line-height:1.85;color:var(--text-mid)}
.kicker{
  display:inline-block;font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:1.2px;color:var(--brand);background:var(--brand-soft);
  border-radius:999px;padding:5px 12px;margin-bottom:16px;
}
.intro-para{
  border-left:3px solid var(--brand);
  padding:4px 0 4px 24px;
  font-size:18px;line-height:1.9;color:var(--text-mid);max-width:920px;
}

/* ============ 左右两段式 ============ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split + .split{margin-top:80px;padding-top:80px;border-top:1px dashed var(--border)}
.split-text h3{margin-bottom:16px}
.split-text p{color:var(--text-mid);line-height:1.85}
.split-media{position:relative}
.split-media img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--r-card);
  box-shadow:var(--shadow-card);background:#E9EEF9;
}
.media-tag{
  position:absolute;top:16px;left:16px;
  background:rgba(255,255,255,.94);border-radius:999px;padding:6px 14px;
  font-size:12px;font-weight:600;color:var(--brand);box-shadow:0 4px 14px rgba(20,35,80,.12);
}
.media-foot{
  position:absolute;left:16px;right:16px;bottom:16px;
  background:rgba(255,255,255,.95);border-radius:12px;padding:14px 18px;
  font-size:13px;color:var(--text-mid);box-shadow:0 8px 22px rgba(20,35,80,.14);
}
.check-list{list-style:none;margin-top:24px;display:grid;gap:14px}
.check-list li{position:relative;padding-left:32px;color:var(--text-mid);line-height:1.7}
.check-list li::before{
  content:"";position:absolute;left:0;top:4px;width:18px;height:18px;border-radius:50%;
  background:var(--brand-soft);border:1px solid var(--brand-line);
}
.check-list li::after{
  content:"";position:absolute;left:5px;top:9px;width:7px;height:4px;
  border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);
  transform:rotate(-45deg);
}
.step-list{list-style:none;margin-top:24px;display:grid;gap:16px;counter-reset:step}
.step-list li{counter-increment:step;display:flex;gap:14px;align-items:flex-start}
.step-list li::before{
  content:counter(step,decimal-leading-zero);
  font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--brand);
  background:var(--brand-soft);border-radius:8px;padding:5px 9px;flex:none;line-height:1.2;
}
.step-list strong{display:block;font-size:16px;font-weight:600;color:var(--text);margin-bottom:2px}
.step-list span{font-size:14px;color:var(--text-mid);line-height:1.7}

/* ============ 指标条 ============ */
.metric-strip{padding:0 0 88px}
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.metric-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--r-card);
  padding:26px 24px;box-shadow:var(--shadow-card);
  transition:transform .25s ease,box-shadow .25s ease;
}
.metric-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.metric-label{display:block;font-size:14px;color:var(--text-weak);margin-bottom:12px}
.metric-value{
  display:block;font-family:var(--font-mono);font-size:24px;font-weight:700;
  color:var(--brand);line-height:1.2;letter-spacing:-.5px;
}
.metric-note{display:block;margin-top:10px;font-size:13px;color:var(--text-mid);line-height:1.6}

/* ============ 场景卡片 ============ */
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.scene-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--r-card);
  padding:28px 24px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:12px;
  transition:transform .25s ease,box-shadow .25s ease;
}
.scene-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.scene-icon{
  width:44px;height:44px;border-radius:12px;background:var(--brand-soft);
  display:grid;place-items:center;color:var(--brand);font-weight:700;
  font-family:var(--font-mono);font-size:15px;
}
.scene-card h3{font-size:18px}
.scene-card p{font-size:14px;line-height:1.75;color:var(--text-mid)}

/* ============ 徽章 / 标签 ============ */
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  font-size:12px;font-weight:600;line-height:1;
}
.badge-brand{background:var(--brand-soft);color:var(--brand)}
.badge-accent{background:#FFF0E9;color:var(--accent-dark)}
.badge-success{background:#E6F7EE;color:var(--success)}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.tag{
  display:inline-flex;align-items:center;height:32px;padding:0 14px;border-radius:999px;
  background:#fff;border:1px solid var(--border);font-size:13px;color:var(--text-mid);
}

/* ============ FAQ ============ */
.faq-wrap{max-width:920px}
.faq-item{
  background:var(--card);border:1px solid var(--border);border-radius:var(--r-card);
  margin-bottom:12px;overflow:hidden;transition:box-shadow .25s ease,border-color .25s ease;
}
.faq-item.is-open{border-color:var(--brand-line);box-shadow:var(--shadow-card)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:60px;padding:18px 24px;background:none;border:0;text-align:left;cursor:pointer;
  font-size:18px;font-weight:600;color:var(--text);
}
.faq-q:hover{color:var(--brand)}
.faq-icon{
  position:relative;flex:none;width:26px;height:26px;border-radius:8px;
  background:var(--brand-soft);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--brand);border-radius:2px;
  left:50%;top:50%;transform:translate(-50%,-50%);
}
.faq-icon::before{width:12px;height:2px}
.faq-icon::after{width:2px;height:12px;transition:transform .2s ease,opacity .2s ease}
.faq-item.is-open .faq-icon::after{transform:translate(-50%,-50%) rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease}
.faq-item.is-open .faq-a{max-height:520px}
.faq-a-inner{padding:0 24px 22px;font-size:16px;line-height:1.85;color:var(--text-mid)}

/* ============ CTA 条 ============ */
.cta-section{padding:0 0 88px}
.cta-inner{
  background:var(--brand);border-radius:20px;padding:48px 52px;
  display:flex;align-items:center;justify-content:space-between;gap:40px;
  box-shadow:0 18px 44px rgba(27,76,216,.26);
}
.cta-inner h2{color:#fff;font-size:28px;margin-bottom:12px}
.cta-inner p{color:rgba(255,255,255,.82);font-size:15px;line-height:1.8;max-width:640px}
.cta-inner .btn{flex:none}

/* ============ 页脚 ============ */
.site-footer{background:#0F1B3D;color:#C3CBE0;padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-mark{background:var(--brand);box-shadow:none}
.footer-brand .brand-text{color:#fff}
.footer-col p{font-size:14px;line-height:1.85;color:#9AA5C2;max-width:340px}
.footer-col h4{font-size:15px;color:#fff;margin-bottom:16px;font-weight:600}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a,.footer-links span{font-size:14px;color:#9AA5C2}
.footer-links a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:22px 0;display:flex;flex-wrap:wrap;gap:12px;
  align-items:center;justify-content:space-between;font-size:13px;color:#8C97B4;
}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .hero-grid{gap:44px}
  .split{gap:44px}
}
@media (max-width:1023px){
  .main-nav{display:none}
  .header-actions .btn{display:none}
  .nav-toggle{display:flex}
  .header-inner{height:64px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .split{grid-template-columns:1fr;gap:32px}
  .split + .split{margin-top:56px;padding-top:56px}
  .metric-grid{grid-template-columns:repeat(2,1fr)}
  .scene-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-inner{padding:40px 36px}
  h1{font-size:36px}
  h2{font-size:27px}
}
@media (max-width:767px){
  .container{padding:0 18px}
  .section{padding:56px 0}
  .section + .section{padding-top:0}
  .metric-strip{padding-bottom:56px}
  .cta-section{padding-bottom:56px}
  h1{font-size:28px;letter-spacing:0}
  h2{font-size:23px}
  h3{font-size:19px}
  .page-hero{padding:36px 0 52px}
  .hero-lead{font-size:16px}
  .hero-actions{gap:12px}
  .hero-actions .btn{width:100%}
  .hero-badge{left:12px;bottom:12px;font-size:12px;padding:8px 14px}
  .metric-grid,.scene-grid{grid-template-columns:1fr}
  .intro-para{font-size:16px;padding-left:18px}
  .faq-q{font-size:16px;padding:16px 18px;min-height:56px}
  .faq-a-inner{padding:0 18px 20px;font-size:15px}
  .cta-inner{flex-direction:column;align-items:flex-start;gap:24px;padding:32px 24px}
  .cta-inner h2{font-size:22px}
  .cta-inner .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .split-media img{aspect-ratio:16/10}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}
@media print{
  .site-header,.mobile-drawer,.cta-section,.site-footer,.faq-icon{display:none}
  body{background:#fff}
}

/* roulang page: category2 */
:root{
  --brand:#1B4CD8;
  --brand-700:#163FB4;
  --brand-050:#EEF3FF;
  --brand-100:#DCE6FF;
  --accent:#FF6A2B;
  --accent-050:#FFF1E9;
  --bg:#F7F9FC;
  --card:#FFFFFF;
  --ink:#151D2E;
  --ink-2:#3C4759;
  --muted:#6B7688;
  --line:#E4EAF5;
  --line-strong:#D8E0EE;
  --success:#12A150;
  --success-050:#E9F8F0;
  --warn:#E0A400;
  --warn-050:#FDF6E3;
  --danger:#D93A3A;
  --radius-card:14px;
  --radius-btn:10px;
  --radius-badge:999px;
  --shadow-sm:0 1px 2px rgba(20,35,80,.06), 0 8px 24px rgba(20,35,80,.06);
  --shadow-lg:0 12px 32px rgba(20,35,80,.12);
  --space-section:96px;
  --font-cn:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-num:"DIN Alternate","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;transition:color .2s ease,opacity .2s ease;}
a:hover{color:var(--brand-700);}
button{font-family:inherit;font-size:inherit;cursor:pointer;}
input,select,textarea{font-family:inherit;font-size:inherit;}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:700;line-height:1.3;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.section{padding:var(--space-section) 0;}
.section-alt{background:#FFFFFF;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:760px;margin-bottom:48px;}
.section-head h2{font-size:32px;line-height:1.3;margin-bottom:16px;}
.section-head .lead{font-size:16px;line-height:1.75;color:var(--ink-2);}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;letter-spacing:.08em;
  color:var(--brand);text-transform:uppercase;margin-bottom:16px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--accent);border-radius:2px;}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#FFFFFF;
  border-bottom:1px solid transparent;
  transition:box-shadow .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
  border-bottom-color:var(--line);
  box-shadow:0 2px 14px rgba(20,35,80,.07);
}
.header-inner{
  display:flex;align-items:center;gap:28px;
  height:72px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:34px;height:34px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand),#3A6BFF);
  color:#fff;font-weight:700;font-size:16px;
  display:grid;place-items:center;letter-spacing:0;
  box-shadow:0 4px 12px rgba(27,76,216,.28);
}
.brand-text{font-size:17px;font-weight:700;color:var(--ink);letter-spacing:.01em;}
.brand:hover .brand-text{color:var(--brand);}
.main-nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-link{
  position:relative;
  padding:8px 12px;border-radius:8px;
  font-size:15px;font-weight:500;color:var(--ink-2);
  white-space:nowrap;
  transition:color .2s ease,background .2s ease;
}
.nav-link:hover{color:var(--brand);background:var(--brand-050);}
.nav-link.is-active{color:var(--brand);font-weight:600;}
.nav-link.is-active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:0;
  height:2px;border-radius:2px;background:var(--brand);
}
.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.nav-toggle{
  display:none;
  width:44px;height:44px;border:1px solid var(--line-strong);
  background:#fff;border-radius:10px;
  align-items:center;justify-content:center;
}
.nav-toggle span{
  display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;position:relative;
}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);border-radius:2px;
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1.2;
  border:1px solid transparent;cursor:pointer;
  transition:background .25s ease,color .25s ease,border-color .25s ease,transform .25s ease,box-shadow .25s ease;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(27,76,216,.22);}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-2px);box-shadow:0 10px 24px rgba(27,76,216,.28);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:transparent;color:var(--brand);border-color:var(--brand-100);}
.btn-ghost:hover{background:var(--brand-050);color:var(--brand-700);border-color:var(--brand);}
.btn-link{
  display:inline-flex;align-items:center;gap:6px;
  font-weight:600;color:var(--brand);
  border-bottom:1px solid rgba(27,76,216,.35);
  padding-bottom:2px;border-radius:0;
}
.btn-link:hover{color:var(--brand-700);border-bottom-color:var(--brand-700);}
.btn-sm{padding:9px 16px;font-size:14px;}

/* ---------- badges ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  height:24px;padding:0 10px;border-radius:var(--radius-badge);
  font-size:12px;font-weight:600;line-height:1;
}
.badge-brand{background:var(--brand-050);color:var(--brand);}
.badge-accent{background:var(--accent-050);color:#C64A15;}
.badge-success{background:var(--success-050);color:var(--success);}
.badge-warn{background:var(--warn-050);color:#9A7100;}
.badge-line{background:#F2F5FB;color:var(--muted);}

/* ---------- page hero ---------- */
.page-hero{
  position:relative;
  padding:56px 0 72px;
  background:linear-gradient(180deg,#F7F9FC 0%,#EEF3FF 100%);
  overflow:hidden;
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(90deg,rgba(27,76,216,.05) 0 1px,transparent 1px 64px);
  opacity:.7;pointer-events:none;
}
.hero-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.05fr .95fr;
  gap:56px;align-items:center;
}
.breadcrumb{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);margin-bottom:20px;
}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb .sep{color:#B9C3D6;}
.breadcrumb .current{color:var(--ink-2);font-weight:600;}
.page-hero h1{
  font-size:44px;line-height:1.25;font-weight:700;letter-spacing:-.01em;
  margin-bottom:20px;
}
.page-hero h1 em{font-style:normal;color:var(--brand);}
.hero-sub{
  font-size:17px;line-height:1.8;color:var(--ink-2);
  max-width:620px;margin-bottom:32px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;}
.hero-facts{
  display:flex;flex-wrap:wrap;gap:28px;
  margin-top:40px;padding-top:24px;border-top:1px dashed var(--line-strong);
}
.hero-fact{font-size:13px;color:var(--muted);}
.hero-fact strong{
  display:block;font-family:var(--font-num);
  font-size:20px;font-weight:700;color:var(--ink);letter-spacing:.01em;margin-bottom:2px;
}
.hero-media{
  position:relative;border-radius:18px;overflow:hidden;
  box-shadow:var(--shadow-lg);aspect-ratio:4/3;background:#E9EEF8;
}
.hero-media img{width:100%;height:100%;object-fit:cover;}
.hero-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(16,30,70,.06) 0%,rgba(16,30,70,.42) 100%);
}
.hero-media figcaption{
  position:absolute;left:20px;right:20px;bottom:18px;z-index:2;
  color:#fff;font-size:14px;font-weight:500;line-height:1.6;
  text-shadow:0 1px 6px rgba(0,0,0,.4);
}

/* ---------- intro ---------- */
.intro-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start;
}
.intro-grid h2{font-size:30px;margin-bottom:18px;}
.intro-grid p{color:var(--ink-2);margin-bottom:16px;}
.point-list li{
  position:relative;padding-left:26px;margin-bottom:12px;color:var(--ink-2);font-size:15px;
}
.point-list li::before{
  content:"";position:absolute;left:0;top:9px;width:14px;height:8px;
  border-left:2px solid var(--success);border-bottom:2px solid var(--success);
  transform:rotate(-45deg);border-radius:1px;
}
.point-list li strong{color:var(--ink);font-weight:600;}

/* ---------- dimension cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.dim-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:26px 24px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.dim-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--brand-100);}
.dim-icon{
  width:44px;height:44px;border-radius:12px;
  background:var(--brand-050);color:var(--brand);
  display:grid;place-items:center;margin-bottom:18px;
}
.dim-icon svg{width:22px;height:22px;}
.dim-card h3{font-size:18px;font-weight:600;margin-bottom:10px;}
.dim-card p{font-size:14px;line-height:1.7;color:var(--muted);}
.dim-card .dim-tag{margin-top:16px;}

/* ---------- timeline ---------- */
.timeline-layout{
  display:grid;grid-template-columns:.85fr 1.15fr;gap:64px;align-items:start;
}
.timeline-side .sticky-note{
  background:linear-gradient(180deg,#FFFFFF,#F4F7FE);
  border:1px solid var(--line);border-radius:var(--radius-card);
  padding:24px;box-shadow:var(--shadow-sm);margin-top:24px;
}
.sticky-note h4{font-size:15px;margin-bottom:10px;}
.sticky-note p{font-size:14px;color:var(--muted);line-height:1.7;}
.timeline{position:relative;padding-left:40px;}
.timeline::before{
  content:"";position:absolute;left:11px;top:10px;bottom:14px;width:2px;border-radius:2px;
  background:linear-gradient(180deg,var(--brand) 0%,#B9CBFB 70%,rgba(185,203,251,0) 100%);
}
.tl-item{position:relative;padding-bottom:36px;}
.tl-item:last-child{padding-bottom:0;}
.tl-num{
  position:absolute;left:-40px;top:2px;
  width:24px;height:24px;border-radius:50%;
  background:#fff;border:2px solid var(--brand);
  color:var(--brand);font-family:var(--font-num);
  font-size:12px;font-weight:700;
  display:grid;place-items:center;
}
.tl-item h3{font-size:19px;font-weight:600;margin-bottom:8px;}
.tl-item p{font-size:15px;line-height:1.8;color:var(--ink-2);}
.tl-meta{
  display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;
}
.tl-meta span{
  font-size:12px;color:var(--muted);background:#F2F5FB;
  border-radius:var(--radius-badge);padding:3px 10px;line-height:1.5;
}

/* ---------- delivery ---------- */
.deliver-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.deliver-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.deliver-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.deliver-card figure{margin:0;aspect-ratio:16/10;background:#E9EEF8;overflow:hidden;}
.deliver-card img{width:100%;height:100%;object-fit:cover;}
.deliver-body{padding:22px 22px 26px;}
.deliver-body h3{font-size:19px;font-weight:600;margin:12px 0 10px;}
.deliver-body p{font-size:14px;line-height:1.7;color:var(--muted);margin-bottom:16px;}

/* ---------- metrics ---------- */
.metrics-band{
  background:#101C3A;border-radius:20px;padding:48px 40px;color:#fff;
  position:relative;overflow:hidden;
}
.metrics-band::before{
  content:"";position:absolute;right:-80px;top:-60px;width:340px;height:340px;
  border-radius:50%;background:radial-gradient(circle,rgba(27,76,216,.55),rgba(27,76,216,0) 70%);
}
.metrics-band h2{color:#fff;font-size:28px;margin-bottom:12px;position:relative;}
.metrics-band .lead{color:#B9C6E4;font-size:15px;max-width:640px;margin-bottom:36px;position:relative;}
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative;}
.metric{
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
  border-radius:14px;padding:22px 20px;
  transition:background .25s ease,transform .25s ease;
}
.metric:hover{background:rgba(255,255,255,.1);transform:translateY(-3px);}
.metric .name{font-size:13px;color:#93A4CC;letter-spacing:.04em;margin-bottom:10px;}
.metric .value{
  font-family:var(--font-num);font-size:34px;font-weight:700;line-height:1.1;
  color:#fff;margin-bottom:10px;
}
.metric .value em{font-style:normal;color:var(--accent);}
.metric .desc{font-size:13px;line-height:1.6;color:#A9B7D8;}

/* ---------- scenario ---------- */
.scenario-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;}
.scenario-grid figure{
  margin:0;border-radius:18px;overflow:hidden;aspect-ratio:16/11;
  box-shadow:var(--shadow-lg);background:#E9EEF8;
}
.scenario-grid img{width:100%;height:100%;object-fit:cover;}
.scenario-list{display:grid;gap:16px;margin-top:28px;}
.scenario-item{
  display:flex;gap:16px;background:#fff;border:1px solid var(--line);
  border-radius:12px;padding:18px 20px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.scenario-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.scenario-item .idx{
  font-family:var(--font-num);font-size:14px;font-weight:700;color:var(--brand);
  background:var(--brand-050);border-radius:8px;width:32px;height:32px;
  display:grid;place-items:center;flex-shrink:0;
}
.scenario-item h4{font-size:16px;font-weight:600;margin-bottom:4px;}
.scenario-item p{font-size:14px;color:var(--muted);line-height:1.7;}

/* ---------- faq ---------- */
.faq-wrap{max-width:900px;margin:0 auto;}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  margin-bottom:12px;overflow:hidden;transition:border-color .25s ease,box-shadow .25s ease;
}
.faq-item:hover{border-color:var(--brand-100);}
.faq-item.is-open{border-color:var(--brand-100);box-shadow:var(--shadow-sm);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:transparent;border:0;text-align:left;
  padding:20px 24px;font-size:18px;font-weight:600;color:var(--ink);
  min-height:52px;
}
.faq-q:hover{color:var(--brand);}
.faq-icon{
  position:relative;width:16px;height:16px;flex-shrink:0;
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--brand);border-radius:2px;
  transition:transform .2s ease,opacity .2s ease;
}
.faq-icon::before{left:0;top:7px;width:16px;height:2px;}
.faq-icon::after{left:7px;top:0;width:2px;height:16px;}
.faq-item.is-open .faq-icon::after{transform:scaleY(0);opacity:0;}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .3s ease;
}
.faq-a-inner{
  padding:0 24px 22px;font-size:16px;line-height:1.8;color:var(--ink-2);
}

/* ---------- cta ---------- */
.cta-band{
  background:linear-gradient(120deg,#1B4CD8 0%,#2C5BF0 55%,#1B4CD8 100%);
  border-radius:20px;padding:44px 40px;color:#fff;
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  box-shadow:0 18px 40px rgba(27,76,216,.25);
}
.cta-band h2{color:#fff;font-size:26px;margin-bottom:10px;}
.cta-band p{color:#CFDBFF;font-size:15px;max-width:620px;}
.cta-actions{display:flex;gap:12px;flex-shrink:0;flex-wrap:wrap;}
.btn-light{background:#fff;color:var(--brand);border-color:#fff;}
.btn-light:hover{background:#EEF3FF;color:var(--brand-700);transform:translateY(-2px);}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.6);}
.btn-outline-light:hover{background:rgba(255,255,255,.12);color:#fff;border-color:#fff;}

/* ---------- footer ---------- */
.site-footer{background:#0E1730;color:#A9B7D8;padding:64px 0 0;margin-top:var(--space-section);}
.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;
  gap:40px;padding-bottom:48px;
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{box-shadow:none;}
.footer-brand .brand-text{color:#fff;font-size:17px;}
.footer-col p{font-size:14px;line-height:1.8;color:#8E9CBE;max-width:340px;}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:18px;}
.footer-links{display:flex;flex-direction:column;gap:12px;}
.footer-links a,.footer-links span{color:#8E9CBE;font-size:14px;transition:color .2s ease;}
.footer-links a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:22px 0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:#7C8AAB;
}

/* ---------- mobile drawer ---------- */
.mobile-drawer{
  position:fixed;inset:0;z-index:80;
  background:#fff;display:none;flex-direction:column;
  transform:translateY(-8px);opacity:0;pointer-events:none;
  transition:opacity .25s ease,transform .25s ease;
}
.mobile-drawer.is-open{opacity:1;transform:translateY(0);pointer-events:auto;}
.mobile-drawer .drawer-head{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;padding:0 20px;border-bottom:1px solid var(--line);
}
.drawer-close{
  width:44px;height:44px;border:1px solid var(--line-strong);background:#fff;
  border-radius:10px;font-size:18px;color:var(--ink);line-height:1;
}
.drawer-links{padding:8px 0;overflow-y:auto;flex:1;}
.drawer-links a{
  display:flex;align-items:center;height:52px;padding:0 20px;
  color:var(--ink-2);font-size:16px;border-bottom:1px solid var(--line);
}
.drawer-links a.is-active{
  color:var(--brand);font-weight:600;
  box-shadow:inset 3px 0 0 var(--brand);
  background:var(--brand-050);
}
.drawer-foot{padding:16px 20px 28px;border-top:1px solid var(--line);}
.drawer-foot .btn{width:100%;}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .card-grid{grid-template-columns:repeat(2,1fr);}
  .deliver-grid{grid-template-columns:repeat(3,1fr);}
  .metric-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:1023px){
  :root{--space-section:64px;}
  .main-nav{display:none;}
  .nav-toggle{display:flex;}
  .header-actions .btn-ghost{display:none;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .page-hero h1{font-size:34px;}
  .intro-grid{grid-template-columns:1fr;gap:32px;}
  .timeline-layout{grid-template-columns:1fr;gap:36px;}
  .scenario-grid{grid-template-columns:1fr;gap:32px;}
  .deliver-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .cta-band{flex-direction:column;align-items:flex-start;padding:36px 28px;}
}
@media (max-width:767px){
  .container{padding:0 18px;}
  .header-inner{height:60px;gap:12px;}
  .brand-text{font-size:15px;}
  .page-hero{padding:32px 0 48px;}
  .page-hero h1{font-size:30px;}
  .hero-sub{font-size:15px;}
  .hero-actions .btn{width:100%;}
  .hero-facts{gap:18px;}
  .section-head{margin-bottom:32px;}
  .section-head h2{font-size:24px;}
  .intro-grid h2{font-size:24px;}
  .card-grid{grid-template-columns:1fr;gap:16px;}
  .deliver-grid{grid-template-columns:1fr;gap:16px;}
  .metric-grid{grid-template-columns:1fr;gap:14px;}
  .metrics-band{padding:32px 22px;border-radius:16px;}
  .metrics-band h2{font-size:22px;}
  .metric .value{font-size:28px;}
  .timeline{padding-left:30px;}
  .timeline::before{left:9px;}
  .tl-num{left:-30px;width:20px;height:20px;font-size:11px;top:3px;}
  .faq-q{font-size:16px;padding:16px 18px;}
  .faq-a-inner{padding:0 18px 18px;font-size:15px;}
  .cta-band{padding:28px 22px;border-radius:16px;}
  .cta-band h2{font-size:21px;}
  .cta-actions{width:100%;}
  .cta-actions .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px;}
  .site-footer{padding-top:44px;}
  .footer-bottom{flex-direction:column;gap:8px;}
}
@media print{
  .site-header,.site-footer,.cta-band,.hero-media,.faq-icon{display:none !important;}
  body{background:#fff;}
}

/* roulang page: category3 */
:root{
  --brand:#1B4CD8;
  --brand-dark:#153EAE;
  --brand-deep:#122F80;
  --brand-soft:#EEF3FF;
  --accent:#FF6A2B;
  --accent-soft:#FFF1E9;
  --bg:#F7F9FC;
  --card:#FFFFFF;
  --text:#141C33;
  --text-2:#4A5878;
  --muted:#7A87A3;
  --border:#E2E8F4;
  --border-strong:#D3DCEE;
  --ok:#12A150;
  --ok-soft:#E7F7EE;
  --warn:#E0A400;
  --warn-soft:#FFF6E0;
  --err:#D93A3A;
  --err-soft:#FDECEC;
  --r-card:14px;
  --r-btn:10px;
  --r-input:10px;
  --shadow-1:0 1px 2px rgba(20,35,80,.06),0 8px 24px rgba(20,35,80,.06);
  --shadow-2:0 12px 32px rgba(20,35,80,.12);
  --container:1200px;
  --section-y:96px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;transition:color .2s ease,opacity .2s ease;}
a:hover{color:var(--brand-dark);}
button{font-family:inherit;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:12px 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;
  border:1px solid transparent;cursor:pointer;
  transition:transform .25s ease,box-shadow .25s ease,background-color .2s ease,color .2s ease,border-color .2s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(27,76,216,.20);}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-2px);box-shadow:0 10px 24px rgba(27,76,216,.26);}
.btn-ghost{background:transparent;color:var(--brand);border-color:var(--brand);}
.btn-ghost:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-dark);transform:translateY(-2px);}
.btn-light{background:#fff;color:var(--brand);border-color:#fff;}
.btn-light:hover{background:#EAF0FF;color:var(--brand-dark);transform:translateY(-2px);}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
.btn-outline-light:hover{background:rgba(255,255,255,.14);color:#fff;border-color:#fff;transform:translateY(-2px);}
.btn-sm{min-height:40px;padding:10px 18px;font-size:14px;}
.btn-block{width:100%;}
.btn[disabled]{background:var(--border);color:var(--muted);border-color:var(--border);cursor:not-allowed;box-shadow:none;transform:none;}

/* ============ 徽章 ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  height:24px;padding:0 10px;border-radius:999px;
  font-size:12px;font-weight:600;line-height:1;
  background:var(--brand-soft);color:var(--brand-dark);
}
.badge-accent{background:var(--accent-soft);color:#C24A12;}
.badge-ok{background:var(--ok-soft);color:#0B7A3C;}
.badge-warn{background:var(--warn-soft);color:#8C6500;}
.badge-plain{background:#F1F4FB;color:var(--text-2);}

/* ============ 头部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid transparent;
  transition:box-shadow .25s ease,border-color .25s ease,background-color .25s ease;
}
.site-header.is-scrolled{
  border-bottom-color:var(--border);
  box-shadow:0 6px 20px rgba(20,35,80,.06);
  background:#fff;
}
.header-inner{display:flex;align-items:center;gap:24px;min-height:72px;}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:36px;height:36px;border-radius:10px;
  display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brand),var(--brand-deep));
  color:#fff;font-size:18px;font-weight:700;
  box-shadow:0 6px 16px rgba(27,76,216,.28);
}
.brand-text{font-size:18px;font-weight:700;color:var(--text);letter-spacing:.2px;}
.brand:hover .brand-text{color:var(--brand);}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto;}
.nav-link{
  position:relative;
  display:inline-flex;align-items:center;height:40px;padding:0 14px;
  font-size:15px;font-weight:500;color:var(--text-2);border-radius:8px;
  transition:color .2s ease,background-color .2s ease;
}
.nav-link:hover{color:var(--brand);background:var(--brand-soft);}
.nav-link.is-active{color:var(--brand);font-weight:700;background:transparent;}
.nav-link.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;
}
.header-actions{display:flex;align-items:center;gap:10px;}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--border);border-radius:10px;
  background:#fff;cursor:pointer;padding:0;position:relative;
}
.nav-toggle span{
  position:absolute;left:12px;right:12px;height:2px;border-radius:2px;background:var(--text);
  transition:transform .25s ease,opacity .2s ease,top .25s ease;
}
.nav-toggle span:nth-child(1){top:15px;}
.nav-toggle span:nth-child(2){top:21px;}
.nav-toggle span:nth-child(3){top:27px;}
.nav-toggle.is-open span:nth-child(1){top:21px;transform:rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){top:21px;transform:rotate(-45deg);}

.mobile-nav{
  display:none;position:fixed;inset:56px 0 0 0;z-index:70;
  background:#fff;padding:12px 20px 96px;overflow-y:auto;
}
.mobile-nav.is-open{display:block;}
.mobile-nav .m-link{
  display:flex;align-items:center;min-height:52px;padding:0 4px;
  font-size:16px;font-weight:600;color:var(--text-2);
  border-bottom:1px solid var(--border);
}
.mobile-nav .m-link.is-active{color:var(--brand);box-shadow:inset 3px 0 0 var(--brand);padding-left:14px;}
.mobile-nav-cta{
  position:fixed;left:0;right:0;bottom:0;padding:14px 20px 20px;background:#fff;
  border-top:1px solid var(--border);
}
body.nav-locked{overflow:hidden;}

/* ============ 页面头部 ============ */
.page-hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 320px at 88% -10%,rgba(27,76,216,.12),transparent 70%),
    linear-gradient(180deg,#F7F9FC 0%,#EEF3FF 100%);
  padding:56px 0 72px;
}
.page-hero::before{
  content:"";position:absolute;right:-120px;top:-60px;width:420px;height:420px;border-radius:50%;
  border:1px solid rgba(27,76,216,.10);
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:24px;}
.breadcrumb a{color:var(--text-2);}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb .sep{color:#B8C2D6;}
.breadcrumb .current{color:var(--muted);}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:56px;align-items:center;position:relative;z-index:1;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand-dark);
  background:#fff;border:1px solid var(--border);border-radius:999px;
  padding:6px 14px;margin-bottom:20px;box-shadow:var(--shadow-1);
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);}
h1.hero-title{font-size:44px;line-height:1.25;font-weight:700;letter-spacing:-.5px;color:var(--text);}
h1.hero-title .hl{color:var(--brand);}
.hero-lead{margin-top:20px;font-size:17px;line-height:1.8;color:var(--text-2);max-width:560px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px;}
.hero-facts{display:flex;flex-wrap:wrap;gap:28px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border-strong);}
.hero-fact{min-width:110px;}
.hero-fact b{display:block;font-family:"DIN Alternate","Roboto Mono",monospace;font-size:26px;font-weight:700;color:var(--brand);line-height:1.1;}
.hero-fact span{font-size:13px;color:var(--muted);}
.hero-visual{position:relative;}
.hero-visual img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:16px;box-shadow:var(--shadow-2);background:#E8EDF7;
}
.hero-visual::after{
  content:"";position:absolute;inset:auto -16px -16px auto;width:180px;height:180px;
  border-radius:18px;background:linear-gradient(150deg,rgba(27,76,216,.16),rgba(255,106,43,.14));
  z-index:-1;
}
.hero-float{
  position:absolute;left:-20px;bottom:24px;background:#fff;border:1px solid var(--border);
  border-radius:12px;box-shadow:var(--shadow-1);padding:12px 16px;display:flex;align-items:center;gap:10px;
}
.hero-float .pulse{width:9px;height:9px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px var(--ok-soft);}
.hero-float span{font-size:13px;color:var(--text-2);font-weight:600;}

/* ============ 通用板块 ============ */
.section{padding:var(--section-y) 0;}
.section-alt{background:#fff;}
.section-deep{background:#101935;color:#DCE4F7;}
.section-deep .section-title{color:#fff;}
.section-deep .section-sub{color:#A9B6D6;}
.section-head{max-width:720px;margin-bottom:48px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-title{font-size:32px;line-height:1.3;font-weight:700;letter-spacing:-.3px;color:var(--text);}
.section-title .hl{color:var(--brand);}
.section-deep .section-title .hl{color:#9DB6FF;}
.section-sub{margin-top:16px;font-size:16px;color:var(--text-2);line-height:1.8;}
.section-deep .section-sub{color:#A9B6D6;}

/* 导语 */
.intro-block{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:48px;align-items:start;}
.intro-text p{font-size:16.5px;line-height:1.9;color:var(--text-2);}
.intro-text p + p{margin-top:16px;}
.intro-side{
  background:#fff;border:1px solid var(--border);border-radius:var(--r-card);
  box-shadow:var(--shadow-1);padding:28px;
}
.intro-side h3{font-size:18px;font-weight:600;margin-bottom:16px;}
.kv-list li{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--border);font-size:14.5px;color:var(--text-2);}
.kv-list li:last-child{border-bottom:none;padding-bottom:0;}
.kv-list .k{color:var(--muted);flex-shrink:0;width:88px;}

/* 指标 */
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;}
.metric-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--r-card);
  padding:26px 24px;box-shadow:var(--shadow-1);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.metric-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2);border-color:var(--border-strong);}
.metric-label{font-size:14px;color:var(--muted);font-weight:600;}
.metric-value{
  font-family:"DIN Alternate","Roboto Mono",monospace;
  font-size:40px;font-weight:700;line-height:1.1;color:var(--brand);margin:10px 0 6px;
}
.metric-card.is-accent .metric-value{color:var(--accent);}
.metric-note{font-size:13px;color:var(--muted);}

/* 对比卡片 2x2 */
.compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.compare-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--r-card);
  padding:28px;box-shadow:var(--shadow-1);
  display:flex;flex-direction:column;gap:18px;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.compare-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2);border-color:var(--border-strong);}
.compare-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.compare-card h3{font-size:22px;font-weight:600;line-height:1.4;}
.compare-card .desc{font-size:14.5px;color:var(--text-2);line-height:1.8;}
.compare-pair{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--border);border-radius:12px;overflow:hidden;}
.pair-col{padding:16px 16px 18px;font-size:14px;line-height:1.75;color:var(--text-2);}
.pair-col + .pair-col{border-left:1px solid var(--border);}
.pair-col .pair-title{
  display:flex;align-items:center;gap:6px;
  font-size:12.5px;font-weight:700;letter-spacing:.4px;margin-bottom:8px;
}
.pair-col.before{background:#FAFBFE;}
.pair-col.before .pair-title{color:var(--muted);}
.pair-col.after{background:var(--brand-soft);}
.pair-col.after .pair-title{color:var(--brand-dark);}

/* 场景卡片 */
.scenes{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;}
.scene-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .25s ease,box-shadow .25s ease;
}
.scene-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2);}
.scene-card img{width:100%;aspect-ratio:16/10;object-fit:cover;background:#E8EDF7;}
.scene-body{padding:20px;}
.scene-body h3{font-size:17px;font-weight:600;margin-bottom:8px;}
.scene-body p{font-size:14px;color:var(--text-2);line-height:1.75;}

/* 流程步骤 */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;counter-reset:step;}
.step-item{position:relative;padding-top:28px;}
.step-item::before{
  content:"";position:absolute;top:0;left:0;right:16px;height:2px;background:var(--border);
}
.step-item::after{
  content:"";position:absolute;top:-4px;left:0;width:10px;height:10px;border-radius:50%;
  background:var(--brand);box-shadow:0 0 0 4px var(--brand-soft);
}
.step-num{
  font-family:"DIN Alternate","Roboto Mono",monospace;
  font-size:13px;font-weight:700;color:var(--accent);letter-spacing:1px;
}
.step-item h3{font-size:18px;font-weight:600;margin:8px 0 8px;}
.step-item p{font-size:14px;color:var(--text-2);line-height:1.75;}

/* 要点清单 */
.check-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 32px;}
.check-list li{display:flex;gap:12px;font-size:15px;color:var(--text-2);line-height:1.75;}
.check-list .tick{
  flex-shrink:0;width:22px;height:22px;border-radius:6px;margin-top:3px;
  background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;
  font-size:12px;font-weight:700;
}
.section-deep .check-list li{color:#C3CEE9;}
.section-deep .check-list .tick{background:rgba(157,182,255,.16);color:#9DB6FF;}

/* FAQ */
.faq{max-width:860px;margin:0 auto;border-top:1px solid var(--border);}
.faq-item{border-bottom:1px solid var(--border);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:60px;padding:18px 4px;background:none;border:none;cursor:pointer;text-align:left;
  font-size:18px;font-weight:600;color:var(--text);line-height:1.5;
  transition:color .2s ease;
}
.faq-q:hover{color:var(--brand);}
.faq-icon{position:relative;flex-shrink:0;width:22px;height:22px;}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--brand);border-radius:2px;transition:transform .2s ease;
}
.faq-icon::before{left:0;right:0;top:10px;height:2px;}
.faq-icon::after{top:0;bottom:0;left:10px;width:2px;}
.faq-item.is-open .faq-icon::after{transform:scaleY(0);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;}
.faq-a-inner{padding:0 48px 24px 4px;font-size:16px;line-height:1.85;color:var(--text-2);}
.faq-item.is-open .faq-a{max-height:420px;}

/* CTA 条 */
.cta-band{
  background:linear-gradient(120deg,#153EAE 0%,#1B4CD8 62%,#2A5CE8 100%);
  border-radius:18px;padding:44px 48px;color:#fff;
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  box-shadow:0 18px 40px rgba(20,50,140,.20);
  position:relative;overflow:hidden;
}
.cta-band::before{
  content:"";position:absolute;right:-60px;top:-80px;width:280px;height:280px;border-radius:50%;
  border:1px solid rgba(255,255,255,.16);
}
.cta-band h2{font-size:28px;font-weight:700;line-height:1.35;color:#fff;}
.cta-band p{margin-top:12px;font-size:15px;color:rgba(255,255,255,.86);max-width:640px;line-height:1.8;}
.cta-actions{display:flex;gap:12px;flex-shrink:0;position:relative;z-index:1;}

/* 页脚 */
.site-footer{background:#0E1630;color:#A9B6D6;padding:72px 0 0;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{background:linear-gradient(140deg,#2A5CE8,#153EAE);box-shadow:none;}
.footer-brand .brand-text{color:#fff;font-size:17px;}
.footer-col p{font-size:14px;line-height:1.85;color:#8E9CBE;max-width:340px;}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:18px;}
.footer-links{display:flex;flex-direction:column;gap:12px;}
.footer-links a,.footer-links span{font-size:14px;color:#8E9CBE;transition:color .2s ease;}
.footer-links a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:22px 0 28px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:#6E7C9C;
}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .metrics{grid-template-columns:repeat(2,minmax(0,1fr));}
  .scenes{grid-template-columns:repeat(2,minmax(0,1fr));}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 24px;}
}
@media (max-width:1023px){
  .main-nav{display:none;}
  .nav-toggle{display:block;}
  .header-inner{min-height:64px;gap:16px;}
  .site-header{position:sticky;}
  .mobile-nav{inset:64px 0 0 0;}
  .header-actions .btn-ghost{display:none;}
  :root{--section-y:72px;}
  .hero-grid{grid-template-columns:1fr;gap:40px;}
  h1.hero-title{font-size:34px;}
  .section-title{font-size:26px;}
  .intro-block{grid-template-columns:1fr;gap:32px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .cta-band{flex-direction:column;align-items:flex-start;padding:36px 32px;}
  .cta-actions{width:100%;}
}
@media (max-width:767px){
  :root{--section-y:56px;}
  .container{padding:0 18px;}
  h1.hero-title{font-size:30px;}
  .hero-lead{font-size:15.5px;}
  .section-title{font-size:24px;}
  .section-head{margin-bottom:32px;}
  .metrics{grid-template-columns:1fr;gap:16px;}
  .compare-grid{grid-template-columns:1fr;gap:16px;}
  .scenes{grid-template-columns:1fr;gap:16px;}
  .steps{grid-template-columns:1fr;gap:24px;}
  .step-item::before{right:0;}
  .check-list{grid-template-columns:1fr;gap:14px;}
  .compare-pair{grid-template-columns:1fr;}
  .pair-col + .pair-col{border-left:none;border-top:1px solid var(--border);}
  .hero-actions .btn{width:100%;}
  .hero-facts{gap:20px;}
  .hero-fact b{font-size:22px;}
  .hero-float{left:12px;bottom:12px;}
  .faq-q{font-size:16.5px;padding:16px 0;min-height:56px;}
  .faq-a-inner{padding-right:8px;}
  .cta-band{padding:28px 22px;}
  .cta-band h2{font-size:22px;}
  .cta-actions{flex-direction:column;}
  .cta-actions .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .brand-text{font-size:16px;}
}
@media (max-width:520px){
  .header-actions .btn-primary{display:none;}
  .metric-value{font-size:34px;}
}
@media print{
  .site-header,.site-footer,.cta-band,.mobile-nav{display:none;}
  body{background:#fff;}
}

/* roulang page: category4 */
:root{
  --brand:#1B4CD8;
  --brand-dark:#1439A8;
  --brand-deep:#12329A;
  --brand-light:#EEF3FF;
  --accent:#FF6A2B;
  --accent-soft:#FFF0E8;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --text:#16203A;
  --text-2:#5B6B8C;
  --text-3:#8A98B5;
  --border:#DCE4F2;
  --success:#12A150;
  --warning:#E0A400;
  --danger:#D93A3A;
  --radius-card:14px;
  --radius-btn:10px;
  --radius-pill:999px;
  --shadow-card:0 1px 2px rgba(20,35,80,.06),0 8px 24px rgba(20,35,80,.06);
  --shadow-hover:0 12px 32px rgba(20,35,80,.12);
  --mono:"DIN Alternate","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --maxw:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
body.no-scroll{overflow:hidden}
img{max-width:100%;display:block;background:#E9EEF8}
a{color:var(--brand);text-decoration:none;transition:color .2s ease}
button{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--text);letter-spacing:-.01em}
h1{font-size:44px;line-height:1.25}
h2{font-size:32px;line-height:1.3}
h3{font-size:22px;line-height:1.4;font-weight:600}
h4{font-size:16px;line-height:1.4}
p{margin:0 0 16px}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1.2;
  border:1px solid transparent;cursor:pointer;min-height:44px;white-space:nowrap;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-1px);box-shadow:0 8px 20px rgba(27,76,216,.24)}
.btn-primary:active{transform:translateY(0);background:var(--brand-deep);box-shadow:none}
.btn-outline{background:transparent;color:var(--brand);border-color:rgba(27,76,216,.35)}
.btn-outline:hover{background:var(--brand-light);border-color:var(--brand)}
.btn-outline:active{background:#E2EAFD}
.btn-light{background:#fff;color:var(--brand)}
.btn-light:hover{background:var(--brand-light);transform:translateY(-1px)}
.btn-ghost-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn-ghost-light:hover{background:rgba(255,255,255,.14);border-color:#fff}
.btn-sm{padding:9px 16px;font-size:14px;min-height:40px}
.btn-block{width:100%}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;background:#fff;
  border-bottom:1px solid var(--border);
  transition:box-shadow .25s ease;
}
.site-header.is-scrolled{box-shadow:0 6px 20px rgba(20,35,80,.08)}
.header-inner{display:flex;align-items:center;gap:28px;min-height:72px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;flex:0 0 auto}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:10px;background:var(--brand);
  color:#fff;font-size:18px;font-weight:700;flex:0 0 auto;
}
.brand-text{font-size:17px;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-link{
  position:relative;display:inline-flex;align-items:center;height:72px;
  padding:0 14px;font-size:15px;font-weight:600;color:var(--text-2);
  transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:16px;height:2px;
  background:var(--brand);border-radius:2px;transform:scaleX(0);transform-origin:left;
  transition:transform .2s ease;
}
.nav-link:hover{color:var(--brand)}
.nav-link.is-active{color:var(--brand)}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{display:flex;gap:10px;flex:0 0 auto}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 10px;margin-left:auto;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-btn);cursor:pointer;
}
.nav-toggle span{display:block;height:2px;border-radius:2px;background:var(--text);transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-drawer{
  position:fixed;inset:0;z-index:80;background:#fff;
  display:flex;flex-direction:column;overflow-y:auto;
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
}
.mobile-drawer.is-open{opacity:1;visibility:visible;transform:none}
.drawer-head{display:flex;align-items:center;gap:10px;padding:18px 24px;border-bottom:1px solid var(--border)}
.drawer-head .brand-text{font-size:17px;font-weight:700}
.drawer-nav{display:flex;flex-direction:column;padding:8px 0}
.drawer-nav a{
  display:flex;align-items:center;min-height:52px;padding:0 24px;
  font-size:16px;font-weight:600;color:var(--text-2);
  border-bottom:1px solid var(--border);
}
.drawer-nav a:hover,.drawer-nav a.is-active{color:var(--brand)}
.drawer-nav a.is-active{box-shadow:inset 3px 0 0 var(--brand);background:#FAFBFF}
.drawer-footer{margin-top:auto;padding:20px 24px 28px;border-top:1px solid var(--border)}

/* ---------- 页面头部 ---------- */
.page-hero{
  position:relative;overflow:hidden;
  padding:36px 0 76px;
  background:linear-gradient(180deg,#F7F9FC 0%,#EEF3FF 100%);
  border-bottom:1px solid var(--border);
}
.page-hero::after{
  content:"";position:absolute;right:-160px;top:-140px;width:520px;height:520px;
  border-radius:50%;border:1px solid rgba(27,76,216,.09);
  box-shadow:0 0 0 56px rgba(27,76,216,.03);pointer-events:none;
}
.page-hero .container{position:relative;z-index:1}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-3);margin-bottom:28px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-2);font-weight:500}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:var(--text-3)}
.breadcrumb .current{color:var(--text-3)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.08em;
  color:var(--brand);background:var(--brand-light);border-radius:var(--radius-pill);
  padding:6px 14px;margin-bottom:18px;
}
.hero-copy h1{margin-bottom:16px}
.hero-sub{font-size:18px;line-height:1.8;color:var(--text-2);max-width:540px;margin-bottom:28px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.badge{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;
  border-radius:var(--radius-pill);font-size:13px;font-weight:600;
  color:var(--brand);background:var(--brand-light);
}
.badge-accent{color:#C2451A;background:var(--accent-soft)}
.hero-media img{
  width:100%;aspect-ratio:16/11;object-fit:cover;
  border-radius:var(--radius-card);box-shadow:var(--shadow-card);
}

/* ---------- 通用板块 ---------- */
.section{padding:96px 0}
.section-tint{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-head{max-width:760px;margin-bottom:40px}
.section-head h2{margin-bottom:14px}
.section-desc{font-size:16px;color:var(--text-2);line-height:1.8;margin:0}
.lede-block{
  max-width:940px;padding-left:22px;border-left:3px solid var(--brand);
  font-size:18px;line-height:1.9;color:var(--text-2);
}
.lede-block strong{color:var(--text);font-weight:600}

/* ---------- 图文交错 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.is-reverse .split-media{order:-1}
.split-body h2{margin-bottom:16px}
.split-body .split-lead{font-size:16px;color:var(--text-2);line-height:1.8;margin-bottom:24px}
.split-media img{
  width:100%;aspect-ratio:16/10;object-fit:cover;
  border-radius:var(--radius-card);box-shadow:var(--shadow-card);
}
.check-list li{
  position:relative;padding:0 0 16px 34px;
  font-size:15px;line-height:1.7;color:var(--text-2);
}
.check-list li:last-child{padding-bottom:0}
.check-list li::before{
  content:"";position:absolute;left:0;top:4px;width:20px;height:20px;
  border-radius:50%;background:var(--brand-light);border:1px solid rgba(27,76,216,.2);
}
.check-list li::after{
  content:"";position:absolute;left:7px;top:9px;width:5px;height:9px;
  border-right:2px solid var(--brand);border-bottom:2px solid var(--brand);
  transform:rotate(45deg);
}
.check-list strong{color:var(--text);font-weight:600}

/* ---------- 能力清单 ---------- */
.ability-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ability-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);
  padding:28px 26px;box-shadow:var(--shadow-card);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.ability-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#C6D5F5}
.ability-icon{
  width:44px;height:44px;border-radius:12px;background:var(--brand-light);color:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.04em;margin-bottom:18px;
}
.ability-card h3{font-size:19px;margin-bottom:10px}
.ability-card p{font-size:14px;line-height:1.7;color:var(--text-2);margin:0}

/* ---------- 规范说明 ---------- */
.spec-list{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-card);
}
.spec-row{
  display:grid;grid-template-columns:210px 1fr;gap:28px;
  padding:22px 28px;border-bottom:1px solid var(--border);
  transition:background-color .2s ease;
}
.spec-row:last-child{border-bottom:0}
.spec-row:hover{background:#F9FBFF}
.spec-key{font-size:14px;font-weight:600;color:var(--brand);letter-spacing:.02em}
.spec-val{font-size:15px;line-height:1.75;color:var(--text-2)}

/* ---------- FAQ ---------- */
.faq{max-width:900px;margin:0 auto}
.faq-item{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);
  margin-bottom:12px;overflow:hidden;
  transition:border-color .25s ease,box-shadow .25s ease;
}
.faq-item.is-open{border-color:#C6D5F5;box-shadow:var(--shadow-card)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  width:100%;min-height:52px;padding:18px 24px;
  background:none;border:0;text-align:left;cursor:pointer;
  font-size:18px;font-weight:600;color:var(--text);line-height:1.5;
}
.faq-q:hover{color:var(--brand)}
.faq-icon{position:relative;flex:0 0 22px;height:22px}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--brand);border-radius:2px;
  transform:translate(-50%,-50%);transition:transform .25s ease;
}
.faq-icon::before{width:14px;height:2px}
.faq-icon::after{width:2px;height:14px}
.faq-item.is-open .faq-icon::after{transform:translate(-50%,-50%) scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a-inner{padding:0 24px 22px;font-size:16px;line-height:1.8;color:var(--text-2)}

/* ---------- CTA ---------- */
.cta-band{
  position:relative;overflow:hidden;background:var(--brand);color:#fff;
  border-radius:20px;padding:56px;
  display:grid;grid-template-columns:1.5fr .5fr;gap:36px;align-items:center;
}
.cta-band::after{
  content:"";position:absolute;right:-120px;bottom:-160px;width:380px;height:380px;
  border-radius:50%;border:1px solid rgba(255,255,255,.16);
  box-shadow:0 0 0 48px rgba(255,255,255,.05);pointer-events:none;
}
.cta-band h2{color:#fff;margin-bottom:14px}
.cta-band p{color:rgba(255,255,255,.82);font-size:16px;line-height:1.8;margin:0;max-width:620px}
.cta-actions{position:relative;z-index:1;display:flex;flex-direction:column;gap:12px}

/* ---------- 页脚 ---------- */
.site-footer{background:#0E1830;color:#A9B6D3;padding-top:72px}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;
  padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.1);
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;color:#fff;font-weight:700;font-size:17px}
.footer-col h4{color:#fff;font-weight:600;font-size:15px;margin-bottom:18px}
.footer-col p{font-size:14px;line-height:1.85;color:#96A4C4;margin:0;max-width:360px}
.footer-links{display:flex;flex-direction:column;gap:12px;font-size:14px}
.footer-links a{color:#A9B6D3}
.footer-links a:hover{color:#fff}
.footer-links span{color:#96A4C4}
.footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding:24px 0;font-size:13px;color:#7C8AAB;
}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .header-inner{gap:16px}
  .nav-link{padding:0 10px;font-size:14px}
  .nav-link::after{left:10px;right:10px}
}
@media (max-width:1023px){
  .main-nav,.header-actions{display:none}
  .nav-toggle{display:flex}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-media img{aspect-ratio:16/9}
  .split{grid-template-columns:1fr;gap:32px}
  .split.is-reverse .split-media{order:0}
  .ability-grid{grid-template-columns:repeat(2,1fr)}
  .cta-band{grid-template-columns:1fr;padding:44px}
  .cta-actions{flex-direction:row;flex-wrap:wrap}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:72px 0}
}
@media (max-width:767px){
  body{font-size:15px}
  h1{font-size:30px}
  h2{font-size:24px}
  h3{font-size:19px}
  .container{padding:0 20px}
  .header-inner{min-height:56px}
  .brand-text{font-size:15px}
  .brand-mark{width:30px;height:30px;font-size:16px;border-radius:9px}
  .page-hero{padding:24px 0 52px}
  .breadcrumb{margin-bottom:20px;font-size:13px}
  .hero-sub{font-size:16px;margin-bottom:22px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%}
  .section{padding:56px 0}
  .section-head{margin-bottom:28px}
  .lede-block{font-size:16px;padding-left:16px}
  .ability-grid{grid-template-columns:1fr;gap:16px}
  .spec-row{grid-template-columns:1fr;gap:8px;padding:20px}
  .faq-q{font-size:16px;padding:16px 18px}
  .faq-a-inner{padding:0 18px 18px;font-size:15px}
  .cta-band{padding:32px 22px;border-radius:16px}
  .cta-actions{flex-direction:column}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .site-footer{padding-top:52px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:520px){
  .hero-badges{gap:8px}
  .badge{font-size:12px;padding:0 10px}
  .split-body .split-lead{font-size:15px}
  .check-list li{font-size:14px;padding-left:30px}
}
@media print{
  .site-header,.cta-band,.site-footer,.nav-toggle{display:none}
  body{background:#fff}
}