/* roulang page: index */
:root{
  --ink:#0E1A16;
  --ink-2:#14302A;
  --volt:#C8F94B;
  --ember:#FF5C36;
  --paper:#F5F3EC;
  --paper-2:#EDEAE1;
  --surface:#FFFFFF;
  --line:rgba(14,26,22,.12);
  --muted:#4A5B55;
  --radius:16px;
  --radius-sm:12px;
  --shadow-1:0 1px 2px rgba(14,26,22,.06), 0 12px 32px -12px rgba(14,26,22,.14);
  --shadow-2:0 20px 44px -16px rgba(14,26,22,.22);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .18s ease,border-color .18s ease,opacity .18s ease;}
button{font:inherit;cursor:pointer;}
input,select,textarea{font:inherit;color:inherit;}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--volt);outline-offset:2px;}
.num{font-variant-numeric:tabular-nums;}

/* 容器 */
.container-x{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:20px;
  padding-right:20px;
}
@media(min-width:768px){.container-x{padding-left:32px;padding-right:32px;}}
@media(min-width:1280px){.container-x{padding-left:40px;padding-right:40px;}}

/* 头部导航 */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(245,243,236,.9);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:height .25s ease;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  height:72px;
  transition:height .25s ease;
}
.site-header.is-compact .header-inner{height:64px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:42px;height:42px;border-radius:12px;
  background:var(--ink-2);
  color:var(--volt);
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:16px;letter-spacing:-.02em;
  border:1px solid rgba(200,249,75,.35);
}
.brand-text{font-weight:800;font-size:17px;letter-spacing:-.01em;color:var(--ink);line-height:1.1;}
.brand-text small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.06em;}
.main-nav{display:none;align-items:center;gap:6px;}
@media(min-width:1024px){.main-nav{display:flex;}}
.nav-link{
  display:inline-block;
  padding:8px 12px;
  font-size:15px;
  color:var(--ink);
  border-radius:10px;
  position:relative;
  white-space:nowrap;
}
.nav-link:hover{background:rgba(14,26,22,.06);}
.nav-link.is-active{font-weight:600;}
.nav-link.is-active::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:2px;
  height:3px;border-radius:2px;background:var(--volt);
}
.header-actions{display:none;align-items:center;gap:12px;}
@media(min-width:1024px){.header-actions{display:flex;}}
.search-box{
  display:flex;align-items:center;gap:8px;
  width:250px;height:42px;padding:0 12px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  transition:border-color .18s ease,box-shadow .18s ease;
}
.search-box:focus-within{border-color:var(--volt);box-shadow:0 0 0 2px rgba(200,249,75,.35);}
.search-box svg{width:18px;height:18px;flex-shrink:0;stroke:var(--muted);}
.search-box input{border:0;background:transparent;outline:none;width:100%;font-size:14px;color:var(--ink);}
.search-box input::placeholder{color:#7E8C86;}
.kbd-badge{
  font-size:11px;letter-spacing:.08em;color:var(--muted);
  background:var(--paper-2);border:1px solid var(--line);
  border-radius:6px;padding:1px 5px;flex-shrink:0;
}
.quick-link{font-size:14px;color:var(--muted);white-space:nowrap;}
.quick-link:hover{color:var(--ink);}
.menu-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:42px;border-radius:12px;
  background:var(--surface);border:1px solid var(--line);
}
@media(min-width:1024px){.menu-toggle{display:none;}}
.menu-toggle span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;position:relative;}
.menu-toggle span::before,.menu-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);border-radius:2px;
}
.menu-toggle span::before{top:-6px;}
.menu-toggle span::after{top:6px;}
.mobile-drawer{display:none;border-top:1px solid var(--line);background:var(--paper);}
.mobile-drawer.is-open{display:block;}
@media(min-width:1024px){.mobile-drawer{display:none !important;}}
.mobile-drawer-inner{padding:18px 0 26px;display:flex;flex-direction:column;gap:14px;}
.mobile-nav{display:flex;flex-direction:column;}
.mobile-nav a{
  padding:13px 4px;border-bottom:1px solid var(--line);
  font-size:16px;display:flex;align-items:center;justify-content:space-between;
}
.mobile-nav a.is-active{font-weight:700;}
.mobile-nav a.is-active::after{content:"●";color:var(--volt);font-size:10px;}

/* 按钮 */
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--volt);color:var(--ink);
  font-weight:600;font-size:15px;
  padding:14px 26px;border-radius:var(--radius-sm);
  border:0;transition:filter .18s ease,box-shadow .18s ease,transform .12s ease;
}
.btn-primary:hover{filter:brightness(.94);box-shadow:var(--shadow-2);}
.btn-primary:active{transform:translateY(1px);}
.btn-primary .arrow{transition:transform .18s ease;}
.btn-primary:hover .arrow{transform:translateX(4px);}
.btn-primary.btn-sm{padding:10px 18px;font-size:14px;}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:var(--ink);
  font-weight:600;font-size:15px;
  padding:13px 24px;border-radius:var(--radius-sm);
  border:1.5px solid var(--ink);
  transition:background .18s ease,transform .12s ease;
}
.btn-ghost:hover{background:rgba(14,26,22,.06);}
.btn-ghost:active{transform:translateY(1px);}
.btn-ghost-light{border-color:rgba(245,243,236,.5);color:var(--paper);}
.btn-ghost-light:hover{background:rgba(245,243,236,.12);}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:15px;color:var(--ink);}
.link-arrow .arrow{transition:transform .18s ease,color .18s ease;}
.link-arrow:hover .arrow{transform:translateX(4px);color:var(--volt);}

/* 徽章 */
.badge-volt{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(200,249,75,.18);
  color:var(--ink);
  font-size:12px;font-weight:600;letter-spacing:.02em;
  padding:5px 12px;border-radius:999px;
  border:1px solid rgba(200,249,75,.5);
}
.badge-ember{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(255,92,54,.12);
  color:#B33A1C;
  font-size:12px;font-weight:600;
  padding:4px 10px;border-radius:999px;
}
.eyebrow{
  font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
}

/* Hero */
.hero{position:relative;overflow:hidden;background:var(--ink-2);}
.hero-bg{
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;background-position:center;
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(20,48,42,.95) 0%,rgba(20,48,42,.86) 46%,rgba(20,48,42,.58) 100%);
}
.hero-inner{position:relative;padding-top:88px;padding-bottom:80px;}
@media(min-width:1024px){.hero-inner{padding-top:112px;padding-bottom:112px;}}
.hero-copy{color:var(--paper);}
.hero-title{
  margin:18px 0 0;
  font-size:clamp(32px,6vw,66px);
  line-height:1.1;
  font-weight:800;
  letter-spacing:-.02em;
  color:#FFFFFF;
}
@media(min-width:1024px){.hero-title{font-size:clamp(40px,4.4vw,62px);}}
.hero-sub{
  margin-top:20px;
  font-size:17px;
  line-height:1.85;
  color:rgba(245,243,236,.78);
  max-width:560px;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;}
.hero-stats{
  margin-top:44px;
  padding-top:26px;
  border-top:1px solid rgba(245,243,236,.18);
}
.hero-stat-num{font-size:30px;font-weight:700;color:var(--volt);line-height:1.1;}
.hero-stat-label{font-size:12px;color:rgba(245,243,236,.66);margin-top:4px;letter-spacing:.02em;}
.hero-visual{position:relative;}
.hero-card{
  position:relative;
  background:var(--surface);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:0 28px 60px -20px rgba(0,0,0,.5);
  border:1px solid rgba(245,243,236,.16);
}
.hero-card img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.hero-card figcaption{
  padding:14px 18px;font-size:13px;color:var(--muted);
  background:var(--surface);border-top:1px solid var(--line);
}
.hero-float{
  position:absolute;left:-10px;bottom:26px;
  background:var(--ink);
  color:var(--paper);
  border:1px solid rgba(200,249,75,.45);
  border-radius:999px;
  font-size:12px;font-weight:600;
  padding:8px 16px;
  box-shadow:var(--shadow-2);
}

/* 通用板块 */
.section{padding-top:64px;padding-bottom:64px;}
@media(min-width:768px){.section{padding-top:96px;padding-bottom:96px;}}
@media(min-width:1280px){.section{padding-top:112px;padding-bottom:112px;}}
.section-alt{background:var(--paper-2);}
.section-dark{background:var(--ink-2);color:var(--paper);}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:44px;}
.section-num{
  display:block;font-size:34px;font-weight:800;line-height:1;
  color:var(--volt);letter-spacing:-.02em;margin-bottom:10px;
}
.section-dark .section-num{color:var(--volt);}
.section-title{
  font-size:clamp(24px,3vw,36px);
  font-weight:700;line-height:1.25;letter-spacing:-.01em;
}
.section-desc{margin-top:12px;color:var(--muted);font-size:16px;max-width:640px;}
.section-dark .section-desc{color:rgba(245,243,236,.72);}
.section-dark .section-title{color:#fff;}

/* 信任带 */
.trust-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--paper);}
.trust-item{
  display:flex;align-items:flex-start;gap:12px;
  padding:22px 0;
}
.trust-item svg{width:22px;height:22px;stroke:var(--ink-2);flex-shrink:0;margin-top:3px;}
.trust-item p{font-size:14px;color:var(--ink);line-height:1.6;}

/* 卡片 */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-1);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.55);}
.step-card{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:30px 26px 28px;
  box-shadow:var(--shadow-1);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.55);}
.step-num{
  font-size:38px;font-weight:800;line-height:1;color:var(--volt);
  letter-spacing:-.03em;margin-bottom:16px;
  transition:opacity .22s ease;opacity:.85;
}
.step-card:hover .step-num{opacity:1;}
.step-card h3{font-size:20px;font-weight:700;margin-bottom:10px;}
.step-card p{font-size:15px;color:var(--muted);line-height:1.8;}

/* 资讯卡片 */
.news-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow-1);
  display:flex;flex-direction:column;
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
  height:100%;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.55);}
.news-cover{overflow:hidden;background:var(--paper-2);}
.news-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .3s ease;}
.news-card:hover .news-cover img{transform:scale(1.04);}
.news-body{padding:20px 20px 18px;display:flex;flex-direction:column;gap:10px;flex:1;}
.news-title{
  font-size:18px;font-weight:700;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-summary{
  font-size:14px;color:var(--muted);line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--muted);
}
.news-meta .arrow{transition:transform .18s ease,color .18s ease;}
.news-card:hover .news-meta .arrow{transform:translateX(4px);color:var(--ink);}
.empty-state{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;text-align:center;
  padding:64px 24px;
  background:var(--surface);
  border:1px dashed var(--line);
  border-radius:var(--radius);
}
.empty-state svg{width:40px;height:40px;stroke:var(--muted);}
.empty-state p{font-size:15px;color:var(--muted);}

/* 案例错位网格 */
.case-grid{display:grid;gap:24px;grid-template-columns:1fr;}
@media(min-width:768px){.case-grid{grid-template-columns:repeat(2,1fr);}}
.case-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 26px;
  box-shadow:var(--shadow-1);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.55);}
.case-card.wide{display:grid;gap:22px;}
@media(min-width:768px){
  .case-card.wide{grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);align-items:center;}
  .case-offset{margin-top:36px;}
}
.case-card h3{font-size:20px;font-weight:700;margin:14px 0 10px;}
.case-card p{font-size:15px;color:var(--muted);line-height:1.85;}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.tag{
  font-size:12px;font-weight:600;color:var(--ink);
  background:var(--paper-2);border:1px solid var(--line);
  border-radius:999px;padding:5px 12px;
}
.case-media{border-radius:var(--radius-sm);overflow:hidden;background:var(--paper-2);}
.case-media img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.quote-bar{
  margin-top:24px;padding:20px 22px;border-radius:var(--radius);
  background:var(--paper-2);border-left:3px solid var(--volt);
  font-size:15px;color:var(--ink);line-height:1.85;
}
.quote-bar span{display:block;margin-top:8px;font-size:13px;color:var(--muted);}

/* FAQ */
.faq-wrap{max-width:820px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;background:transparent;border:0;text-align:left;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:22px 4px;font-size:17px;font-weight:600;color:var(--ink);
}
.faq-q .plus{
  width:22px;height:22px;flex-shrink:0;position:relative;
  transition:transform .24s ease;
}
.faq-q .plus::before,.faq-q .plus::after{
  content:"";position:absolute;background:var(--ink);border-radius:2px;
}
.faq-q .plus::before{left:0;top:10px;width:22px;height:2px;}
.faq-q .plus::after{left:10px;top:0;width:2px;height:22px;transition:opacity .24s ease;}
.faq-item.is-open .faq-q .plus::after{opacity:0;}
.faq-item.is-open .faq-q .plus{transform:rotate(180deg);}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .24s ease;
}
.faq-a-inner{padding:0 4px 24px;font-size:15px;color:var(--muted);line-height:1.85;max-width:720px;}

/* CTA */
.cta-block{
  background:var(--ink-2);
  border-radius:24px;
  padding:48px 28px;
  position:relative;
  overflow:hidden;
  color:var(--paper);
}
@media(min-width:768px){.cta-block{padding:64px 56px;}}
.cta-block::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.03) 0 2px,transparent 2px 14px);
  pointer-events:none;
}
.cta-grid{position:relative;display:grid;gap:36px;}
@media(min-width:1024px){.cta-grid{grid-template-columns:minmax(0,1fr) minmax(0,.9fr);align-items:center;}}
.cta-block h2{font-size:clamp(26px,3.2vw,38px);font-weight:700;line-height:1.25;color:#fff;}
.cta-block p.lead{margin-top:14px;font-size:16px;color:rgba(245,243,236,.76);max-width:520px;}
.cta-points{margin-top:26px;display:flex;flex-direction:column;gap:12px;}
.cta-points li{display:flex;align-items:flex-start;gap:10px;font-size:15px;color:rgba(245,243,236,.85);}
.cta-points li::before{
  content:"";width:8px;height:8px;border-radius:2px;background:var(--volt);
  margin-top:9px;flex-shrink:0;
}
.form-card{
  background:var(--surface);
  color:var(--ink);
  border-radius:var(--radius);
  padding:26px 24px;
  box-shadow:var(--shadow-2);
}
.form-grid{display:grid;gap:16px;}
@media(min-width:768px){.form-grid{grid-template-columns:repeat(2,1fr);}}
.field{display:flex;flex-direction:column;gap:7px;}
.field.full{grid-column:1 / -1;}
.field label{font-size:13px;font-weight:600;color:var(--ink);}
.field input,.field select,.field textarea{
  height:48px;border-radius:var(--radius-sm);
  border:1px solid var(--line);background:#fff;
  padding:0 14px;font-size:15px;outline:none;
  transition:border-color .18s ease,box-shadow .18s ease;
}
.field textarea{height:auto;min-height:96px;padding:12px 14px;resize:vertical;line-height:1.7;}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--volt);box-shadow:0 0 0 2px rgba(200,249,75,.35);
}
.form-hint{font-size:13px;color:var(--muted);}

/* 页脚 */
.site-footer{background:var(--ink);color:rgba(245,243,236,.8);padding:64px 0 0;margin-top:0;}
.footer-grid{display:grid;gap:36px;grid-template-columns:1fr;}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.1fr;}}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{background:rgba(200,249,75,.14);border-color:rgba(200,249,75,.4);}
.footer-brand .brand-text{color:#fff;}
.footer-brand .brand-text small{color:rgba(245,243,236,.6);}
.site-footer p{font-size:14px;line-height:1.85;color:rgba(245,243,236,.72);}
.footer-title{font-size:13px;font-weight:700;letter-spacing:.08em;color:#fff;text-transform:uppercase;margin-bottom:16px;}
.footer-links{display:flex;flex-direction:column;gap:11px;}
.footer-links a{font-size:14px;color:rgba(245,243,236,.75);}
.footer-links a:hover{color:var(--volt);}
.footer-contact{display:flex;flex-direction:column;gap:12px;}
.footer-contact div{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:rgba(245,243,236,.75);}
.footer-contact svg{width:18px;height:18px;stroke:rgba(200,249,75,.85);flex-shrink:0;margin-top:4px;}
.footer-bottom{
  margin-top:48px;padding:20px 0;
  border-top:1px solid rgba(245,243,236,.14);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:rgba(245,243,236,.6);
}
.footer-bottom a{color:rgba(245,243,236,.75);}
.footer-bottom a:hover{color:var(--volt);}

/* 动效 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .4s cubic-bezier(.22,.61,.36,1),transform .4s cubic-bezier(.22,.61,.36,1);}
.reveal.is-in{opacity:1;transform:none;}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}

/* roulang page: article */
:root{
  --ink:#0E1A16;
  --ink-2:#14302A;
  --volt:#C8F94B;
  --ember:#FF5C36;
  --paper:#F5F3EC;
  --paper-2:#EDEAE1;
  --surface:#FFFFFF;
  --line:rgba(14,26,22,.12);
  --muted:#4A5B55;
  --radius-card:16px;
  --radius-img:12px;
  --radius-btn:12px;
  --shadow-1:0 1px 2px rgba(14,26,22,.06), 0 12px 32px -12px rgba(14,26,22,.14);
  --shadow-2:0 20px 44px -16px rgba(14,26,22,.22);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit;}
input{font:inherit;}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--volt);outline-offset:2px;border-radius:6px;}

.container-x{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 20px;
}
@media (min-width:768px){.container-x{padding:0 32px;}}
@media (min-width:1280px){.container-x{padding:0 40px;}}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(245,243,236,.9);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .24s ease;
}
.site-header.is-scrolled{box-shadow:0 8px 24px -18px rgba(14,26,22,.4);}
.header-inner{
  display:flex;align-items:center;gap:22px;
  height:72px;
  transition:height .24s ease;
}
.site-header.is-scrolled .header-inner{height:64px;}

.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:42px;height:38px;padding:0 8px;
  background:var(--ink);color:var(--volt);
  font-weight:800;font-size:17px;letter-spacing:.02em;
  border-radius:10px;font-variant-numeric:tabular-nums;
}
.brand-text{
  display:flex;flex-direction:column;
  font-weight:800;font-size:17px;line-height:1.15;letter-spacing:-.01em;
}
.brand-text small{
  font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.06em;
  margin-top:2px;
}

.main-nav{display:none;align-items:center;gap:4px;margin-left:6px;}
@media (min-width:1024px){.main-nav{display:flex;}}
.nav-link{
  position:relative;
  padding:8px 12px;border-radius:10px;
  font-size:15px;color:var(--ink);opacity:.82;
  transition:opacity .18s ease,background-color .18s ease;
}
.nav-link:hover{opacity:1;background:rgba(14,26,22,.05);}
.nav-link.is-active{opacity:1;font-weight:600;box-shadow:inset 0 -3px 0 var(--volt);border-radius:8px;}

.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto;}

.cmd-search{
  display:none;align-items:center;gap:8px;
  width:250px;height:40px;padding:0 10px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-btn);
  transition:border-color .18s ease,box-shadow .18s ease;
}
@media (min-width:1180px){.cmd-search{display:flex;}}
.cmd-search svg{width:16px;height:16px;stroke:var(--muted);fill:none;flex-shrink:0;}
.cmd-search input{
  flex:1;min-width:0;border:0;background:transparent;outline:none;
  font-size:14px;color:var(--ink);
}
.cmd-search input::placeholder{color:#8C9A94;}
.cmd-search:focus-within{border-color:var(--volt);box-shadow:0 0 0 3px rgba(200,249,75,.35);}
.kbd{
  font-size:11px;letter-spacing:.08em;color:var(--muted);
  background:var(--paper-2);border:1px solid var(--line);
  border-radius:6px;padding:2px 5px;flex-shrink:0;
}

.text-link{
  display:none;align-items:center;gap:6px;
  font-size:14px;color:var(--ink);opacity:.85;
  transition:opacity .18s ease,color .18s ease;
}
@media (min-width:1100px){.text-link{display:inline-flex;}}
.text-link svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:1.8;transition:transform .18s ease;}
.text-link:hover{opacity:1;color:var(--ink-2);}
.text-link:hover svg{transform:translateX(4px);}

.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--volt);color:var(--ink);
  font-weight:600;font-size:15px;
  padding:12px 22px;border-radius:var(--radius-btn);
  box-shadow:var(--shadow-1);
  transition:filter .18s ease,transform .18s ease,box-shadow .18s ease;
}
.btn-primary:hover{filter:brightness(.94);box-shadow:var(--shadow-2);transform:translateY(-2px);}
.btn-primary:active{transform:translateY(0);}
.btn-primary svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;transition:transform .18s ease;}
.btn-primary:hover svg{transform:translateX(4px);}

.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:var(--ink);
  font-weight:600;font-size:15px;
  padding:11px 22px;border-radius:var(--radius-btn);
  border:1.5px solid var(--ink);
  transition:background-color .18s ease,transform .18s ease;
}
.btn-ghost:hover{background:rgba(14,26,22,.06);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(0);}

.menu-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:40px;border:1px solid var(--line);border-radius:var(--radius-btn);
  background:var(--surface);
}
@media (min-width:1024px){.menu-btn{display:none;}}
.menu-btn svg{width:20px;height:20px;stroke:var(--ink);fill:none;stroke-width:1.8;stroke-linecap:round;}

/* 移动端抽屉 */
.mobile-drawer{
  position:fixed;inset:0 0 auto 0;top:0;z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  transform:translateY(-104%);
  transition:transform .28s cubic-bezier(.22,.61,.36,1);
  padding:18px 20px 24px;
  box-shadow:var(--shadow-2);
}
.mobile-drawer.is-open{transform:translateY(0);}
.drawer-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.drawer-close{width:40px;height:40px;border:1px solid var(--line);border-radius:var(--radius-btn);display:inline-flex;align-items:center;justify-content:center;background:var(--surface);}
.drawer-close svg{width:18px;height:18px;stroke:var(--ink);fill:none;stroke-width:1.8;}
.drawer-links{display:flex;flex-direction:column;gap:2px;margin-bottom:16px;}
.drawer-links a{padding:12px 10px;border-radius:12px;font-size:16px;font-weight:500;}
.drawer-links a:hover{background:rgba(14,26,22,.05);}
.drawer-search{display:flex;align-items:center;gap:8px;height:46px;padding:0 12px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-btn);margin-bottom:14px;}
.drawer-search svg{width:16px;height:16px;stroke:var(--muted);fill:none;}
.drawer-search input{flex:1;border:0;background:transparent;outline:none;font-size:15px;}

/* ============ 面包屑 ============ */
.crumb-bar{border-bottom:1px solid var(--line);background:var(--paper);}
.crumb{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:16px 0;font-size:13px;color:var(--muted);}
.crumb a{color:var(--muted);transition:color .18s ease;}
.crumb a:hover{color:var(--ink);}
.crumb .sep{opacity:.5;}
.crumb .current{max-width:52ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink);}

/* ============ 主体布局 ============ */
.page-main{padding:40px 0 72px;}
@media (min-width:768px){.page-main{padding:56px 0 96px;}}
.article-layout{display:grid;grid-template-columns:1fr;gap:48px;}
@media (min-width:1024px){
  .article-layout{grid-template-columns:minmax(0,8fr) minmax(0,4fr);gap:56px;}
  .article-aside{position:sticky;top:96px;align-self:start;}
}

.article-head{max-width:760px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);font-weight:600;margin-bottom:14px;
}
.eyebrow::before{content:"";width:28px;height:3px;background:var(--volt);border-radius:2px;}
.article-title{
  font-size:clamp(28px,3.6vw,44px);
  font-weight:800;line-height:1.2;letter-spacing:-.02em;
  margin-bottom:18px;
  overflow-wrap:break-word;
}
.meta-bar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
  padding-bottom:18px;
  border-bottom:1px solid var(--line);
}
.meta-bar .dot{width:4px;height:4px;border-radius:50%;background:var(--line);}
.badge-volt{
  display:inline-flex;align-items:center;
  background:rgba(200,249,75,.28);color:var(--ink);
  font-size:12px;font-weight:600;
  padding:4px 12px;border-radius:999px;
}
.badge-ember{
  display:inline-flex;align-items:center;
  background:rgba(255,92,54,.14);color:var(--ember);
  font-size:12px;font-weight:600;
  padding:4px 12px;border-radius:999px;
}
.meta-bar span.num{font-variant-numeric:tabular-nums;}

/* ============ 正文排版 ============ */
.prose-cn{
  max-width:760px;
  font-size:17px;line-height:1.9;
  padding-top:28px;
  overflow-wrap:break-word;
}
.prose-cn > * + *{margin-top:1.5em;}
.prose-cn p{color:#22322D;}
.prose-cn h2{
  position:relative;
  font-size:28px;font-weight:700;line-height:1.35;
  margin-top:48px;margin-bottom:16px;
  padding-left:16px;
}
.prose-cn h2::before{
  content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:3px;background:var(--volt);border-radius:2px;
}
.prose-cn h3{font-size:20px;font-weight:700;margin-top:36px;margin-bottom:12px;}
.prose-cn h4{font-size:17px;font-weight:700;margin-top:28px;margin-bottom:10px;}
.prose-cn a{color:var(--ink-2);border-bottom:1px solid rgba(200,249,75,.9);transition:background-color .18s ease;}
.prose-cn a:hover{background:rgba(200,249,75,.35);}
.prose-cn strong{font-weight:700;}
.prose-cn ul,.prose-cn ol{margin-top:1.2em;display:flex;flex-direction:column;gap:10px;}
.prose-cn li{position:relative;padding-left:22px;}
.prose-cn li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:8px;height:8px;border-radius:2px;background:var(--volt);
}
.prose-cn ol{counter-reset:li;}
.prose-cn ol li::before{
  content:counter(li);counter-increment:li;
  width:auto;height:auto;background:none;border-radius:0;
  top:0;font-weight:700;font-size:15px;color:var(--ink-2);
}
.prose-cn blockquote{
  background:var(--paper-2);
  border-left:3px solid var(--volt);
  padding:20px 22px;border-radius:0 12px 12px 0;
  color:#2C3B36;font-size:16px;
}
.prose-cn img{border-radius:var(--radius-img);margin:8px auto;box-shadow:var(--shadow-1);}
.prose-cn figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px;}
.prose-cn table{
  width:100%;border-collapse:collapse;font-size:15px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden;
}
.prose-cn th,.prose-cn td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;}
.prose-cn thead th{background:var(--paper-2);font-weight:700;}
.prose-cn tbody tr:hover{background:rgba(200,249,75,.14);}
.prose-cn hr{border:0;border-top:1px solid var(--line);margin:36px 0;}

/* 空态 */
.empty-state{
  max-width:760px;text-align:center;
  padding:64px 24px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
}
.empty-state svg{width:40px;height:40px;stroke:var(--muted);fill:none;stroke-width:1.5;margin:0 auto 16px;}
.empty-state p{font-size:15px;color:var(--muted);margin-bottom:20px;}

/* ============ 标签与操作条 ============ */
.article-foot{max-width:760px;margin-top:40px;}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;padding-bottom:22px;border-bottom:1px solid var(--line);}
.tag{
  display:inline-flex;align-items:center;
  font-size:13px;color:var(--muted);
  background:var(--paper-2);border:1px solid var(--line);
  padding:5px 14px;border-radius:999px;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.tag:hover{color:var(--ink);border-color:rgba(200,249,75,.9);background:rgba(200,249,75,.18);}
.action-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding-top:22px;}
.btn-mini{
  display:inline-flex;align-items:center;gap:7px;
  font-size:14px;font-weight:600;
  padding:10px 16px;border-radius:var(--radius-btn);
  background:var(--surface);border:1px solid var(--line);
  box-shadow:var(--shadow-1);
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.btn-mini:hover{transform:translateY(-2px);border-color:rgba(200,249,75,.9);box-shadow:var(--shadow-2);}
.btn-mini svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:1.8;}

/* 上下导航 */
.post-nav{display:grid;grid-template-columns:1fr;gap:16px;margin-top:32px;max-width:760px;}
@media (min-width:640px){.post-nav{grid-template-columns:1fr 1fr;}}
.post-nav a{
  display:flex;flex-direction:column;gap:6px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:18px 20px;box-shadow:var(--shadow-1);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.post-nav a:hover{transform:translateY(-4px);border-color:rgba(200,249,75,.9);box-shadow:var(--shadow-2);}
.post-nav .dir{font-size:12px;letter-spacing:.08em;color:var(--muted);text-transform:uppercase;font-weight:600;}
.post-nav .ttl{font-size:16px;font-weight:700;line-height:1.5;}

/* ============ 侧栏 ============ */
.aside-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:22px;box-shadow:var(--shadow-1);
}
.aside-card + .aside-card{margin-top:20px;}
.aside-title{
  display:flex;align-items:center;justify-content:space-between;
  font-size:16px;font-weight:700;margin-bottom:16px;
}
.aside-title::after{content:"";flex:1;height:1px;background:var(--line);margin-left:14px;}
.mini-list{display:flex;flex-direction:column;gap:14px;}
.mini-item{display:flex;gap:12px;align-items:flex-start;}
.mini-thumb{
  width:64px;height:48px;flex-shrink:0;border-radius:10px;overflow:hidden;background:var(--paper-2);
}
.mini-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.mini-item:hover .mini-thumb img{transform:scale(1.05);}
.mini-text{font-size:14px;font-weight:600;line-height:1.55;transition:color .18s ease;}
.mini-item:hover .mini-text{color:var(--ink-2);}
.mini-meta{display:block;font-size:12px;color:var(--muted);font-weight:400;margin-top:4px;font-variant-numeric:tabular-nums;}
.cat-links{display:flex;flex-direction:column;gap:2px;}
.cat-links a{
  display:flex;align-items:center;justify-content:space-between;
  padding:11px 12px;border-radius:10px;font-size:15px;
  transition:background-color .18s ease;
}
.cat-links a:hover{background:rgba(200,249,75,.22);}
.cat-links svg{width:14px;height:14px;stroke:var(--muted);fill:none;stroke-width:2;transition:transform .18s ease;}
.cat-links a:hover svg{transform:translateX(4px);stroke:var(--ink);}
.aside-cta{
  border:1.5px solid var(--volt);background:rgba(200,249,75,.12);
  border-radius:var(--radius-card);padding:22px;margin-top:20px;
}
.aside-cta h3{font-size:17px;font-weight:700;margin-bottom:8px;}
.aside-cta p{font-size:14px;color:var(--muted);margin-bottom:16px;line-height:1.7;}

/* ============ 区块标题 ============ */
.section{padding-top:72px;}
@media (min-width:768px){.section{padding-top:96px;}}
.section-head{margin-bottom:32px;}
.section-num{
  display:block;
  font-size:40px;font-weight:800;color:var(--volt);
  line-height:1;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;margin-bottom:12px;
}
.section-head h2{font-size:clamp(26px,3vw,36px);font-weight:700;line-height:1.25;letter-spacing:-.01em;}
.section-head p{margin-top:12px;font-size:15px;color:var(--muted);max-width:64ch;}

/* ============ 文章卡片网格 ============ */
.card-grid{display:grid;grid-template-columns:1fr;gap:24px;}
@media (min-width:640px){.card-grid{grid-template-columns:repeat(2,1fr);}}
@media (min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr);}}
.card{
  display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(200,249,75,.9);box-shadow:var(--shadow-2);}
.card-media{aspect-ratio:16/9;overflow:hidden;background:var(--paper-2);}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.card:hover .card-media img{transform:scale(1.04);}
.card-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.card-body h3{font-size:18px;font-weight:700;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card-body p{font-size:14px;color:var(--muted);line-height:1.75;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:6px;font-size:13px;color:var(--muted);}
.card-foot svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;transition:transform .18s ease;}
.card:hover .card-foot svg{transform:translateX(4px);}

/* ============ FAQ ============ */
.faq-wrap{max-width:820px;margin:0 auto;border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 4px;text-align:left;
  font-size:17px;font-weight:600;line-height:1.6;
}
.faq-q svg{width:18px;height:18px;flex-shrink:0;stroke:var(--ink);fill:none;stroke-width:2;transition:transform .24s ease;}
.faq-item.is-open .faq-q svg{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s ease;}
.faq-a-inner{padding:0 4px 22px;font-size:15px;color:var(--muted);line-height:1.85;max-width:70ch;}
.faq-item.is-open .faq-a{max-height:320px;}

/* ============ CTA ============ */
.cta-block{
  position:relative;overflow:hidden;
  background:var(--ink-2);color:var(--paper);
  border-radius:24px;
  padding:44px 28px;
  display:grid;gap:26px;
}
@media (min-width:768px){.cta-block{padding:56px 48px;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);align-items:center;}}
.cta-block::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.045) 0 1px,transparent 1px 14px);
}
.cta-block > *{position:relative;z-index:1;}
.cta-block h2{font-size:clamp(24px,2.8vw,34px);font-weight:700;line-height:1.3;letter-spacing:-.01em;}
.cta-block p{margin-top:14px;font-size:15px;color:rgba(245,243,236,.78);max-width:52ch;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;}
.cta-block .btn-ghost{color:var(--paper);border-color:rgba(245,243,236,.7);}
.cta-block .btn-ghost:hover{background:rgba(245,243,236,.12);}
.cta-stats{display:flex;flex-wrap:wrap;gap:28px;margin-top:26px;}
.cta-stat span{display:block;font-size:30px;font-weight:800;color:var(--volt);line-height:1.1;font-variant-numeric:tabular-nums;}
.cta-stat small{font-size:12px;color:rgba(245,243,236,.7);letter-spacing:.04em;}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink);color:rgba(245,243,236,.8);padding:64px 0 26px;margin-top:24px;}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px;}
@media (min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:32px;}}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{background:var(--volt);color:var(--ink);}
.footer-brand .brand-text{color:var(--paper);}
.footer-brand .brand-text small{color:rgba(245,243,236,.6);}
.site-footer p{font-size:14px;line-height:1.85;color:rgba(245,243,236,.68);max-width:42ch;}
.footer-title{font-size:15px;font-weight:700;color:var(--paper);margin-bottom:16px;}
.footer-links{display:flex;flex-direction:column;gap:11px;}
.footer-links a{font-size:14px;color:rgba(245,243,236,.72);transition:color .18s ease;}
.footer-links a:hover{color:var(--volt);}
.footer-contact{display:flex;flex-direction:column;gap:12px;font-size:14px;color:rgba(245,243,236,.72);}
.footer-contact div{display:flex;align-items:flex-start;gap:10px;}
.footer-contact svg{width:20px;height:20px;stroke:var(--volt);fill:none;stroke-width:1.6;flex-shrink:0;margin-top:2px;}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;align-items:center;
  margin-top:44px;padding-top:22px;
  border-top:1px solid rgba(245,243,236,.14);
  font-size:13px;color:rgba(245,243,236,.6);
}
.footer-bottom a{color:rgba(245,243,236,.8);}
.footer-bottom a:hover{color:var(--volt);}

/* 动效 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .4s cubic-bezier(.22,.61,.36,1),transform .4s cubic-bezier(.22,.61,.36,1);}
.reveal.is-visible{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}

/* roulang page: category1 */
:root{
  --ink:#0E1A16;
  --ink-2:#14302A;
  --volt:#C8F94B;
  --ember:#FF5C36;
  --paper:#F5F3EC;
  --paper-2:#EDEAE1;
  --surface:#FFFFFF;
  --line:rgba(14,26,22,.12);
  --muted:#4A5B55;
  --radius-card:16px;
  --radius-img:12px;
  --radius-btn:12px;
  --shadow-1:0 1px 2px rgba(14,26,22,.06),0 12px 32px -12px rgba(14,26,22,.14);
  --shadow-2:0 20px 44px -16px rgba(14,26,22,.22);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  background:var(--paper);
  color:var(--ink);
  font-size:16.5px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  letter-spacing:0;
}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.25;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .18s var(--ease)}
button{font:inherit;cursor:pointer;color:inherit}
input{font:inherit}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--volt);outline-offset:2px;border-radius:6px}
.num{font-variant-numeric:tabular-nums}

/* ============ 容器与栅格 ============ */
.container-x{max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container-x{padding:0 32px}}
@media(min-width:1280px){.container-x{padding:0 40px}}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(245,243,236,.92);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;align-items:center;gap:20px;
  height:72px;transition:height .25s var(--ease);
}
.site-header.is-scrolled .header-inner{height:64px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:10px;
  background:var(--volt);color:var(--ink);
  font-weight:800;font-size:16px;letter-spacing:-.02em;
}
.brand-text{
  display:flex;flex-direction:column;
  font-weight:800;font-size:17px;line-height:1.15;letter-spacing:-.01em;
}
.brand-text small{font-size:11px;font-weight:500;color:var(--muted);letter-spacing:0;line-height:1.5}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:6px}
.nav-link{
  position:relative;padding:9px 12px;border-radius:10px;
  font-size:14.5px;font-weight:500;color:var(--ink);white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.nav-link:hover{background:rgba(14,26,22,.05)}
.nav-link.is-active{font-weight:600}
.nav-link.is-active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;
  height:3px;border-radius:2px;background:var(--volt);
}
.header-tools{margin-left:auto;display:flex;align-items:center;gap:12px}
.search-box{
  position:relative;display:flex;align-items:center;gap:8px;
  width:240px;height:42px;padding:0 10px 0 12px;
  border:1px solid var(--line);border-radius:12px;background:var(--surface);
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.search-box:focus-within{border-color:var(--volt);box-shadow:0 0 0 2px rgba(200,249,75,.35)}
.search-box svg{width:16px;height:16px;flex-shrink:0;stroke:var(--muted);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.search-box input{
  flex:1;min-width:0;border:0;background:transparent;outline:none;
  font-size:13.5px;color:var(--ink);
}
.search-box input::placeholder{color:#8C9A94}
.kbd{
  font-size:11px;letter-spacing:.08em;color:var(--muted);
  border:1px solid var(--line);border-radius:6px;
  padding:1px 5px;background:var(--paper-2);
}
.quick-link{
  font-size:14px;font-weight:500;color:var(--ink);
  padding:8px 4px;border-bottom:1px solid transparent;
}
.quick-link:hover{color:var(--ink-2);border-bottom-color:var(--volt)}
.menu-toggle{
  display:none;width:42px;height:42px;border:1px solid var(--line);
  border-radius:12px;background:var(--surface);
  align-items:center;justify-content:center;flex-direction:column;gap:4px;
}
.menu-toggle span{display:block;width:16px;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.menu-toggle.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.menu-toggle.is-open span:nth-child(2){opacity:0}
.menu-toggle.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.mobile-drawer{display:none;border-top:1px solid var(--line);background:var(--paper)}
.mobile-drawer.is-open{display:block}
.drawer-inner{padding:20px 20px 28px;display:flex;flex-direction:column;gap:14px}
.drawer-inner .nav-link{padding:12px 14px;font-size:15px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.drawer-inner .nav-link.is-active{border-color:var(--volt);background:rgba(200,249,75,.14)}
.drawer-inner .nav-link.is-active::after{display:none}
.drawer-search{width:100%;height:46px}
.drawer-cta{width:100%;margin-top:4px}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:600;font-size:15px;line-height:1;
  padding:14px 26px;border-radius:var(--radius-btn);
  border:1.5px solid transparent;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease),filter .18s var(--ease);
}
.btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .18s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--volt);color:var(--ink)}
.btn-primary:hover{filter:brightness(.94);box-shadow:var(--shadow-2)}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:rgba(14,26,22,.06)}
.btn-sm{padding:10px 18px;font-size:14px;border-radius:11px}
.btn-on-dark{background:var(--volt);color:var(--ink)}
.btn-on-dark:hover{filter:brightness(.94)}
.btn-ghost-light{background:transparent;border-color:rgba(245,243,236,.5);color:var(--paper)}
.btn-ghost-light:hover{background:rgba(245,243,236,.12)}

/* ============ 徽章 / 标签 ============ */
.badge-volt{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:.02em;
  background:rgba(200,249,75,.22);color:var(--ink);
}
.badge-ember{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:999px;
  font-size:11.5px;font-weight:600;
  background:rgba(255,92,54,.14);color:#C33A17;
}
.eyebrow{
  font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);
}

/* ============ 面包屑 ============ */
.breadcrumb{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px;
  font-size:13px;color:rgba(245,243,236,.7);
}
.breadcrumb a{color:rgba(245,243,236,.7)}
.breadcrumb a:hover{color:var(--volt)}
.breadcrumb .current{color:rgba(245,243,236,.95)}
.breadcrumb span.sep{opacity:.5}

/* ============ 首屏 ============ */
.page-hero{
  position:relative;
  background-image:linear-gradient(118deg,rgba(20,48,42,.96) 0%,rgba(20,48,42,.88) 48%,rgba(20,48,42,.7) 100%),url('/assets/images/backpic/back-1.png');
  background-size:cover;
  background-position:center;
  background-color:var(--ink-2);
  padding:84px 0 88px;
  overflow:hidden;
}
.hero-grid{
  display:grid;grid-template-columns:1.35fr 1fr;gap:56px;align-items:center;
}
.hero-main{max-width:640px}
.hero-main .breadcrumb{margin-bottom:24px}
.hero-main .badge-volt{background:rgba(200,249,75,.2);color:var(--volt)}
.page-hero h1{
  margin-top:18px;
  font-size:clamp(32px,4.6vw,58px);
  font-weight:800;line-height:1.14;letter-spacing:-.02em;
  color:#F7F6F0;
  max-width:15em;
}
.hero-sub{
  margin-top:20px;
  font-size:17px;line-height:1.8;
  color:rgba(245,243,236,.8);
  max-width:32em;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-note{
  margin-top:18px;font-size:13px;color:rgba(245,243,236,.6);
}
.quick-card{
  background:var(--surface);
  border-radius:var(--radius-card);
  padding:26px 24px;
  box-shadow:var(--shadow-2);
}
.quick-card-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:16px;border-bottom:1px solid var(--line);
}
.quick-card-head h2{font-size:17px;font-weight:700}
.quick-list li{
  display:flex;gap:14px;align-items:flex-start;
  padding:16px 0;border-bottom:1px dashed var(--line);
}
.quick-list li:last-child{border-bottom:0;padding-bottom:2px}
.quick-num{
  flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;
  min-width:62px;height:30px;padding:0 10px;
  border-radius:8px;background:rgba(200,249,75,.24);
  font-size:13.5px;font-weight:800;font-variant-numeric:tabular-nums;color:var(--ink);
}
.quick-list strong{display:block;font-size:14.5px;font-weight:700}
.quick-list p{font-size:13px;color:var(--muted);line-height:1.7;margin-top:2px}

/* ============ 区块通用 ============ */
.section{padding:96px 0}
.section-alt{background:var(--paper-2)}
@media(max-width:1023px){.section{padding:72px 0}}
@media(max-width:767px){.section{padding:56px 0}}
.section-head{margin-bottom:40px;max-width:760px}
.section-head h2{
  display:flex;gap:14px;align-items:baseline;
  font-size:clamp(26px,3.1vw,36px);font-weight:700;line-height:1.28;
}
.sec-num{
  font-size:.85em;font-weight:800;color:var(--volt);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;
  text-shadow:0 0 0 rgba(0,0,0,0);
  -webkit-text-stroke:.6px rgba(14,26,22,.35);
}
.section-head p{margin-top:14px;color:var(--muted);font-size:16px}
.lead{font-size:17px;color:var(--muted);max-width:62em}

/* ============ 指标带 ============ */
.stat-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--paper)}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat-cell{
  display:flex;align-items:center;gap:12px;
  padding:26px 22px;border-right:1px solid var(--line);
}
.stat-cell:last-child{border-right:0}
.stat-cell svg{
  width:22px;height:22px;flex-shrink:0;
  fill:none;stroke:var(--ink-2);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;
}
.stat-cell b{display:block;font-size:15px;font-weight:700;line-height:1.5}
.stat-cell span{display:block;font-size:12.5px;color:var(--muted);line-height:1.6}
@media(max-width:1023px){
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .stat-cell:nth-child(2){border-right:0}
  .stat-cell:nth-child(1),.stat-cell:nth-child(2){border-bottom:1px solid var(--line)}
}
@media(max-width:520px){
  .stat-grid{grid-template-columns:1fr}
  .stat-cell{border-right:0;border-bottom:1px solid var(--line)}
  .stat-cell:last-child{border-bottom:0}
}

/* ============ 长文两栏 + 目录 ============ */
.doc-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:64px;align-items:start}
.doc-main{max-width:720px}
.doc-block{padding-top:8px}
.doc-block + .doc-block{margin-top:56px;padding-top:44px;border-top:1px solid var(--line)}
.doc-block h2{
  display:flex;gap:12px;align-items:baseline;
  font-size:27px;font-weight:700;line-height:1.32;margin-bottom:18px;
}
.doc-block h2::before{
  content:"";width:3px;height:22px;border-radius:2px;background:var(--volt);
  align-self:center;flex-shrink:0;
}
.doc-block h3{
  font-size:19px;font-weight:700;margin:30px 0 10px;line-height:1.5;
}
.doc-block p{font-size:16.5px;line-height:1.9;color:#22302B}
.doc-block p + p{margin-top:16px}
.doc-block ul{margin-top:16px;display:flex;flex-direction:column;gap:10px}
.doc-block ul li{
  position:relative;padding-left:20px;font-size:16px;line-height:1.85;color:#22302B;
}
.doc-block ul li::before{
  content:"";position:absolute;left:2px;top:.72em;
  width:7px;height:7px;border-radius:2px;background:var(--volt);
}
.doc-note{
  margin-top:22px;padding:18px 20px;
  background:var(--paper-2);border-left:3px solid var(--volt);border-radius:0 12px 12px 0;
  font-size:15px;color:var(--muted);line-height:1.85;
}
.doc-side{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.toc{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:22px 20px;box-shadow:var(--shadow-1);
}
.toc-title{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--muted);text-transform:uppercase;margin-bottom:14px}
.toc a{
  display:block;padding:9px 10px;border-radius:10px;
  font-size:14px;color:#22302B;border-left:2px solid transparent;
  transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.toc a:hover{background:rgba(200,249,75,.16);border-left-color:var(--volt)}
.side-cta{
  border:1.5px solid var(--volt);border-radius:var(--radius-card);
  padding:22px 20px;background:rgba(200,249,75,.1);
}
.side-cta h3{font-size:16px;font-weight:700;margin-bottom:8px}
.side-cta p{font-size:13.5px;color:var(--muted);line-height:1.75;margin-bottom:16px}
@media(max-width:1023px){
  .doc-grid{grid-template-columns:1fr;gap:36px}
  .doc-side{position:static}
  .doc-main{max-width:none}
}

/* ============ 卡片 ============ */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.55)}
.card-media{aspect-ratio:16/9;overflow:hidden;background:var(--paper-2)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}
.card-body{padding:22px 20px;display:flex;flex-direction:column;flex:1}
.card-title{font-size:18px;font-weight:700;line-height:1.45}
.card-desc{margin-top:10px;font-size:14px;color:var(--muted);line-height:1.75}
.card-foot{
  margin-top:auto;padding-top:16px;
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--muted);
}
.card-foot svg{width:16px;height:16px;fill:none;stroke:var(--ink);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .18s var(--ease),stroke .18s var(--ease)}
.card:hover .card-foot svg{transform:translateX(4px);stroke:#8FB52C}
@media(max-width:1023px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:639px){.card-grid{grid-template-columns:1fr}}

/* ============ FAQ ============ */
.faq-wrap{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:first-child{border-top:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:22px 2px;background:transparent;border:0;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink);
  transition:color .18s var(--ease);
}
.faq-q:hover{color:var(--ink-2)}
.faq-arrow{
  width:18px;height:18px;flex-shrink:0;
  fill:none;stroke:var(--ink);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;
  transition:transform .24s var(--ease);
}
.faq-item.is-open .faq-arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s var(--ease)}
.faq-a p{padding:0 2px 24px;font-size:15px;line-height:1.85;color:var(--muted);max-width:66em}

/* ============ CTA 区块 ============ */
.cta-block{
  position:relative;overflow:hidden;
  background:var(--ink-2);border-radius:24px;
  padding:56px 52px;
  display:grid;grid-template-columns:1.5fr 1fr;gap:36px;align-items:center;
}
.cta-block::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(135deg,rgba(255,255,255,.035) 0 2px,transparent 2px 9px);
}
.cta-block h2{font-size:clamp(24px,2.8vw,32px);color:#F7F6F0;line-height:1.32;max-width:20em}
.cta-block p{margin-top:14px;color:rgba(245,243,236,.8);font-size:16px;max-width:38em}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:flex-end;position:relative;z-index:1}
@media(max-width:900px){
  .cta-block{grid-template-columns:1fr;padding:40px 28px;gap:26px}
  .cta-actions{justify-content:flex-start}
}

/* ============ 相关分类 ============ */
.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.related-link{
  display:flex;flex-direction:column;gap:6px;
  padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--surface);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.related-link:hover{transform:translateY(-3px);border-color:rgba(200,249,75,.6);box-shadow:var(--shadow-1)}
.related-link b{font-size:15.5px;font-weight:700}
.related-link span{font-size:13px;color:var(--muted);line-height:1.7}
.related-link.is-current{border-color:var(--volt);background:rgba(200,249,75,.14)}
@media(max-width:1023px){.related-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.related-grid{grid-template-columns:1fr}}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:96px;background:var(--ink);color:rgba(245,243,236,.8);
  padding:72px 0 0;
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:44px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.footer-brand .brand-mark{background:var(--volt);color:var(--ink)}
.footer-brand .brand-text{color:#F7F6F0}
.footer-brand .brand-text small{color:rgba(245,243,236,.6)}
.site-footer p{font-size:14px;line-height:1.85;color:rgba(245,243,236,.72);max-width:34em}
.footer-title{font-size:14px;font-weight:700;color:#F7F6F0;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:11px}
.footer-links a{font-size:14px;color:rgba(245,243,236,.78)}
.footer-links a:hover{color:var(--volt)}
.footer-contact div{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;margin-bottom:12px;color:rgba(245,243,236,.78)}
.footer-contact svg{
  width:20px;height:20px;flex-shrink:0;margin-top:4px;
  fill:none;stroke:var(--volt);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;
}
.footer-bottom{
  margin-top:56px;padding:22px 0;
  border-top:1px solid rgba(245,243,236,.14);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:rgba(245,243,236,.62);
}
.footer-bottom a{color:rgba(245,243,236,.9);text-decoration:underline}
.footer-bottom a:hover{color:var(--volt)}
@media(max-width:1023px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
  .site-footer{margin-top:72px;padding-top:56px}
}
@media(max-width:600px){
  .footer-grid{grid-template-columns:1fr;gap:30px}
}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* ============ 导航响应式 ============ */
@media(max-width:1180px){
  .search-box{width:190px}
  .main-nav .nav-link{padding:9px 9px;font-size:14px}
}
@media(max-width:1023px){
  .main-nav,.header-tools .search-box,.header-tools .quick-link,.header-tools .btn{display:none}
  .menu-toggle{display:flex}
}

/* roulang page: category2 */
:root{
  --ink:#0E1A16;
  --ink-2:#14302A;
  --volt:#C8F94B;
  --ember:#FF5C36;
  --paper:#F5F3EC;
  --paper-2:#EDEAE1;
  --surface:#FFFFFF;
  --line:rgba(14,26,22,.12);
  --muted:#4A5B55;
  --r-card:16px;
  --r-img:12px;
  --r-btn:12px;
  --sh-1:0 1px 2px rgba(14,26,22,.06),0 12px 32px -12px rgba(14,26,22,.14);
  --sh-2:0 20px 44px -16px rgba(14,26,22,.22);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
h1,h2,h3,h4,p,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
.num{font-variant-numeric:tabular-nums}
::selection{background:var(--volt);color:var(--ink)}

.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container-x{padding:0 32px}}
@media (min-width:1280px){.container-x{padding:0 40px}}

/* ============ header ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(245,243,236,.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:height .25s var(--ease);
  height:72px;
}
.site-header.is-scrolled{height:64px}
.header-inner{display:flex;align-items:center;gap:26px;height:100%}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{
  width:40px;height:40px;border-radius:11px;
  background:var(--ink);color:var(--volt);
  display:grid;place-items:center;
  font-weight:800;font-size:16px;letter-spacing:.02em;
  font-variant-numeric:tabular-nums;
  transition:transform .2s var(--ease);
}
.logo:hover .logo-mark{transform:translateY(-1px)}
.logo-text{font-weight:700;font-size:17px;line-height:1.1;letter-spacing:-.01em;display:flex;flex-direction:column}
.logo-text small{font-size:11px;font-weight:400;color:var(--muted);letter-spacing:.01em;margin-top:3px}
.main-nav{display:flex;align-items:center;gap:22px;margin-left:6px}
.nav-link{
  font-size:15px;color:#263a34;white-space:nowrap;
  padding:4px 0;transition:color .18s var(--ease);
}
.nav-link:hover{color:var(--ink)}
.nav-link.is-active{
  font-weight:600;color:var(--ink);
  text-decoration:underline 3px var(--volt);
  text-underline-offset:8px;
}
.header-right{display:flex;align-items:center;gap:14px;margin-left:auto}
.cmd-search{
  display:flex;align-items:center;gap:9px;
  width:250px;height:42px;padding:0 12px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-btn);
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.cmd-search:focus-within{
  border-color:var(--volt);
  box-shadow:0 0 0 3px rgba(200,249,75,.35);
}
.cmd-search svg{width:16px;height:16px;stroke:var(--muted);flex-shrink:0}
.cmd-search input{
  flex:1;min-width:0;border:0;outline:0;background:transparent;
  font-size:13.5px;
}
.cmd-search input::placeholder{color:#8a978f}
.kbd{
  font-size:11px;letter-spacing:.08em;color:var(--muted);
  background:var(--paper-2);border:1px solid var(--line);
  border-radius:6px;padding:2px 6px;flex-shrink:0;
}
.quick-link{
  font-size:14px;color:var(--muted);white-space:nowrap;
  transition:color .18s var(--ease);
}
.quick-link:hover{color:var(--ink)}
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--volt);color:var(--ink);
  font-weight:600;font-size:15px;
  padding:13px 24px;border-radius:var(--r-btn);
  border:1px solid transparent;
  transition:filter .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn-primary:hover{filter:brightness(.94);box-shadow:var(--sh-2);transform:translateY(-2px)}
.btn-primary:active{transform:translateY(0)}
.btn-primary:focus-visible{outline:2px solid var(--volt);outline-offset:3px}
.btn-primary svg{width:16px;height:16px;stroke:currentColor;transition:transform .18s var(--ease)}
.btn-primary:hover svg{transform:translateX(4px)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-ghost{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;color:var(--ink);
  font-weight:600;font-size:15px;
  padding:13px 24px;border-radius:var(--r-btn);
  border:1.5px solid var(--ink);
  transition:background .18s var(--ease),transform .18s var(--ease);
}
.btn-ghost:hover{background:rgba(14,26,22,.06);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(0)}
.btn-ghost:focus-visible{outline:2px solid var(--volt);outline-offset:3px}
.btn-ghost-light{
  border-color:rgba(245,243,236,.55);color:#F5F3EC;
}
.btn-ghost-light:hover{background:rgba(245,243,236,.12)}
.menu-btn{
  display:none;width:42px;height:42px;border-radius:var(--r-btn);
  border:1px solid var(--line);background:var(--surface);
  align-items:center;justify-content:center;
}
.menu-btn svg{width:20px;height:20px;stroke:var(--ink)}

/* mobile drawer */
.mobile-drawer{
  position:fixed;left:0;right:0;top:0;z-index:70;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  box-shadow:var(--sh-2);
  padding:18px 20px 26px;
  transform:translateY(-104%);
  transition:transform .28s var(--ease);
}
.mobile-drawer.is-open{transform:translateY(0)}
.drawer-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.drawer-close{width:40px;height:40px;border:1px solid var(--line);border-radius:var(--r-btn);display:grid;place-items:center;background:var(--surface)}
.drawer-close svg{width:18px;height:18px;stroke:var(--ink)}
.drawer-links{display:flex;flex-direction:column;gap:2px;margin-bottom:16px}
.drawer-links a{
  padding:12px 4px;font-size:16px;border-bottom:1px solid var(--line);
}
.drawer-links a.is-active{font-weight:700;color:var(--ink);box-shadow:inset 3px 0 0 var(--volt);padding-left:12px}
.drawer-search{margin-bottom:14px}
@media (max-width:1024px){
  .main-nav,.cmd-search,.quick-link{display:none}
  .menu-btn{display:flex}
}

/* ============ breadcrumb ============ */
.crumb-bar{border-bottom:1px solid var(--line);background:var(--paper)}
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);padding:14px 0;flex-wrap:wrap}
.crumb a{transition:color .18s var(--ease)}
.crumb a:hover{color:var(--ink)}
.crumb .sep{color:#a9b5ae}
.crumb .cur{color:var(--ink);font-weight:600}

/* ============ hero ============ */
.hero-c2{
  position:relative;overflow:hidden;
  background:var(--ink-2);
  padding:104px 0 96px;
}
.hero-c2 .hero-bg{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;opacity:.34;
}
.hero-c2 .hero-veil{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(20,48,42,.92) 0%,rgba(20,48,42,.86) 46%,rgba(20,48,42,.97) 100%);
}
.hero-inner{position:relative;z-index:2;max-width:860px;margin:0 auto;text-align:center}
.badge-volt{
  display:inline-flex;align-items:center;gap:7px;
  background:rgba(200,249,75,.18);color:var(--volt);
  border:1px solid rgba(200,249,75,.35);
  font-size:12.5px;font-weight:600;letter-spacing:.02em;
  padding:6px 14px;border-radius:999px;margin-bottom:22px;
}
.hero-c2 h1{
  color:#F5F3EC;
  font-size:clamp(34px,4.8vw,60px);
  font-weight:800;letter-spacing:-.02em;line-height:1.1;
  margin-bottom:20px;
}
.hero-c2 h1 em{font-style:normal;color:var(--volt)}
.hero-lead{
  color:rgba(245,243,236,.76);
  font-size:17px;line-height:1.9;
  max-width:720px;margin:0 auto 30px;
}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:44px}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  border-top:1px solid rgba(245,243,236,.16);
  padding-top:26px;
}
.hero-stats .st{text-align:center}
.hero-stats .st b{
  display:block;color:var(--volt);
  font-size:28px;font-weight:700;line-height:1.2;
  font-variant-numeric:tabular-nums;
}
.hero-stats .st span{font-size:12.5px;color:rgba(245,243,236,.62);letter-spacing:.02em}
@media (max-width:767px){
  .hero-c2{padding:72px 0 64px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:22px 12px}
}

/* ============ sections ============ */
.section{padding:96px 0}
.section-alt{background:var(--paper-2)}
@media (max-width:767px){.section{padding:60px 0}}
.section-head{max-width:760px;margin:0 auto 48px;text-align:center}
.section-head h2{
  font-size:clamp(26px,3.2vw,38px);
  font-weight:700;line-height:1.28;letter-spacing:-.015em;
  margin-bottom:14px;
}
.section-head p{color:var(--muted);font-size:16px}
.eyebrow{
  display:inline-block;font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--muted);font-weight:600;
  margin-bottom:12px;
}
.eyebrow::before{
  content:"";display:inline-block;width:26px;height:3px;
  background:var(--volt);border-radius:2px;margin-right:10px;vertical-align:middle;
}

/* ============ 2x2 大图卡 ============ */
.grid-c2{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:28px;
}
.card-c2{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  box-shadow:var(--sh-1);
  display:flex;flex-direction:column;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),border-color .24s var(--ease);
}
.card-c2:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:rgba(200,249,75,.6)}
.thumb-16-10{
  position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--paper-2);
}
.thumb-16-10 img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease)}
.card-c2:hover .thumb-16-10 img{transform:scale(1.03)}
.thumb-16-10 .tag{
  position:absolute;left:14px;top:14px;
  background:rgba(14,26,22,.72);color:var(--volt);
  font-size:12px;font-weight:600;letter-spacing:.02em;
  padding:5px 12px;border-radius:999px;
  backdrop-filter:blur(6px);
}
.card-body{padding:24px 26px 28px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:21px;font-weight:700;line-height:1.4;margin-bottom:10px}
.card-body p{color:var(--muted);font-size:15px;line-height:1.8;margin-bottom:16px}
.tick-list{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.tick-list li{position:relative;padding-left:20px;font-size:14.5px;color:#33463f}
.tick-list li::before{
  content:"";position:absolute;left:0;top:11px;
  width:7px;height:7px;border-radius:2px;background:var(--volt);
}
.text-link{
  display:inline-flex;align-items:center;gap:7px;
  font-size:14.5px;font-weight:600;color:var(--ink);margin-top:auto;
  transition:color .18s var(--ease);
}
.text-link svg{width:15px;height:15px;stroke:currentColor;transition:transform .18s var(--ease)}
.text-link:hover{color:#2c6b4f}
.text-link:hover svg{transform:translateX(4px)}
@media (max-width:900px){.grid-c2{grid-template-columns:1fr;gap:22px}}

/* ============ 数据项规格 ============ */
.spec-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.spec-grid .spec{
  padding:32px 24px;
  border-right:1px solid var(--line);
}
.spec-grid .spec:last-child{border-right:0}
.spec .spec-num{
  font-size:13px;font-weight:700;color:var(--volt);
  letter-spacing:.08em;font-variant-numeric:tabular-nums;
  -webkit-text-stroke:.4px rgba(14,26,22,.5);
  display:block;margin-bottom:12px;
}
.spec h3{font-size:17px;font-weight:700;margin-bottom:8px}
.spec p{font-size:14px;color:var(--muted);line-height:1.75}
@media (max-width:900px){
  .spec-grid{grid-template-columns:repeat(2,1fr)}
  .spec-grid .spec:nth-child(2){border-right:0}
  .spec-grid .spec:nth-child(-n+2){border-bottom:1px solid var(--line)}
}
@media (max-width:560px){
  .spec-grid{grid-template-columns:1fr}
  .spec-grid .spec{border-right:0;border-bottom:1px solid var(--line);padding:24px 4px}
  .spec-grid .spec:last-child{border-bottom:0}
}

/* ============ 查询三步 ============ */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;counter-reset:step}
.step{
  position:relative;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-card);
  padding:30px 26px 28px;
  box-shadow:var(--sh-1);
  transition:transform .24s var(--ease),border-color .24s var(--ease);
}
.step:hover{transform:translateY(-4px);border-color:rgba(200,249,75,.6)}
.step::after{
  content:"";position:absolute;right:-26px;top:50%;
  width:26px;height:0;border-top:1px dashed rgba(14,26,22,.2);
}
.step:last-child::after{display:none}
.step .big-num{
  display:block;
  font-size:40px;font-weight:800;color:var(--volt);
  line-height:1;letter-spacing:-.02em;margin-bottom:14px;
  font-variant-numeric:tabular-nums;
}
.step h3{font-size:19px;font-weight:700;margin-bottom:10px}
.step p{font-size:14.5px;color:var(--muted)}
@media (max-width:900px){.steps{grid-template-columns:1fr;gap:0}}
@media (max-width:900px){
  .step{border-radius:0;border-left:0;border-right:0;box-shadow:none;padding:22px 0 22px 22px}
  .step:first-child{border-top:1px solid var(--line)}
  .step::after{display:none}
  .step::before{
    content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--volt);
  }
}

/* ============ FAQ ============ */
.faq-wrap{max-width:820px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:first-child{border-top:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:22px 4px;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink);line-height:1.6;
}
.faq-q svg{width:18px;height:18px;stroke:var(--ink);flex-shrink:0;transition:transform .24s var(--ease)}
.faq-item.is-open .faq-q svg{transform:rotate(180deg)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .24s var(--ease);
}
.faq-a p{
  font-size:15px;color:var(--muted);line-height:1.85;
  padding:0 40px 22px 4px;
}

/* ============ CTA ============ */
.cta-block{
  background:var(--ink-2);
  border-radius:24px;
  padding:52px 48px;
  display:flex;align-items:center;justify-content:space-between;gap:36px;
  position:relative;overflow:hidden;
}
.cta-block::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(115deg,rgba(255,255,255,.035) 0 2px,transparent 2px 12px);
  pointer-events:none;
}
.cta-text{position:relative;z-index:2;max-width:620px}
.cta-text h2{color:#F5F3EC;font-size:clamp(24px,3vw,34px);font-weight:700;line-height:1.3;margin-bottom:12px}
.cta-text p{color:rgba(245,243,236,.74);font-size:15.5px}
.cta-actions{position:relative;z-index:2;display:flex;gap:14px;flex-wrap:wrap}
@media (max-width:900px){
  .cta-block{flex-direction:column;align-items:flex-start;padding:36px 24px;gap:24px}
}

/* ============ 相关分类 ============ */
.rel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.rel-card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:24px 22px;
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.rel-card:hover{transform:translateY(-4px);border-color:rgba(200,249,75,.6);box-shadow:var(--sh-1)}
.rel-card .rel-tag{font-size:12px;letter-spacing:.06em;color:var(--muted);font-weight:600;margin-bottom:10px;display:block}
.rel-card h3{font-size:17px;font-weight:700;margin-bottom:8px;line-height:1.45}
.rel-card p{font-size:14px;color:var(--muted);line-height:1.75}
@media (max-width:900px){.rel-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.rel-grid{grid-template-columns:1fr}}

/* ============ footer ============ */
.site-footer{
  background:var(--ink);color:rgba(245,243,236,.8);
  padding:72px 0 28px;margin-top:0;
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px;margin-bottom:44px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.brand-mark{
  width:40px;height:40px;border-radius:11px;
  background:var(--volt);color:var(--ink);
  display:grid;place-items:center;font-weight:800;font-size:16px;
  font-variant-numeric:tabular-nums;
}
.brand-text{color:#F5F3EC;font-weight:700;font-size:17px;line-height:1.15;display:flex;flex-direction:column}
.brand-text small{font-size:11.5px;font-weight:400;color:rgba(245,243,236,.6);margin-top:4px}
.site-footer p{font-size:14.5px;line-height:1.85;color:rgba(245,243,236,.72);max-width:340px}
.footer-title{color:#F5F3EC;font-weight:700;font-size:15px;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:11px}
.footer-links a{font-size:14.5px;color:rgba(245,243,236,.72);transition:color .18s var(--ease)}
.footer-links a:hover{color:var(--volt)}
.footer-contact{display:flex;flex-direction:column;gap:14px}
.footer-contact div{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:rgba(245,243,236,.72);line-height:1.7}
.footer-contact svg{width:20px;height:20px;stroke:var(--volt);flex-shrink:0;margin-top:3px;fill:none;stroke-width:1.7}
.footer-bottom{
  border-top:1px solid rgba(245,243,236,.16);
  padding-top:22px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  font-size:13px;color:rgba(245,243,236,.6);
}
.footer-bottom a{color:rgba(245,243,236,.8);transition:color .18s var(--ease)}
.footer-bottom a:hover{color:var(--volt)}
@media (max-width:900px){
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:32px}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr}
  .site-footer{padding:52px 0 24px}
}

/* ============ reveal ============ */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1!important;transform:none!important}
}

/* roulang page: category3 */
:root{
  --ink:#0E1A16;
  --ink-2:#14302A;
  --volt:#C8F94B;
  --ember:#FF5C36;
  --paper:#F5F3EC;
  --paper-2:#EDEAE1;
  --surface:#FFFFFF;
  --line:rgba(14,26,22,.12);
  --muted:#4A5B55;
  --r-card:16px;
  --r-img:12px;
  --r-btn:12px;
  --sh-1:0 1px 2px rgba(14,26,22,.06), 0 12px 32px -12px rgba(14,26,22,.14);
  --sh-2:0 20px 44px -16px rgba(14,26,22,.22);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16.5px;
  line-height:1.8;
  font-variant-numeric:tabular-nums;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .18s ease}
a:hover{color:var(--ink-2)}
button,input{font:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--volt);outline-offset:2px;border-radius:6px}

/* ---------- 容器 ---------- */
.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container-x{padding:0 32px}}
@media(min-width:1280px){.container-x{padding:0 40px}}

/* ---------- 顶栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(245,243,236,.9);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:height .22s ease;
}
.header-inner{
  display:flex;align-items:center;gap:24px;
  height:72px;
  transition:height .22s ease;
}
.site-header.is-scrolled .header-inner{height:64px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:40px;height:40px;border-radius:11px;
  background:var(--ink-2);color:var(--volt);
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:16px;letter-spacing:.01em;
  flex-shrink:0;
}
.brand-text{display:flex;flex-direction:column;line-height:1.16}
.brand-text strong{font-size:17px;font-weight:800;letter-spacing:-.01em}
.brand-text small{font-size:11px;color:var(--muted);letter-spacing:.06em}

.main-nav{display:flex;align-items:center;gap:6px;margin-left:8px}
.nav-link{
  position:relative;
  padding:8px 12px;border-radius:10px;
  font-size:14.5px;font-weight:500;color:#33443E;
  white-space:nowrap;
}
.nav-link:hover{background:rgba(14,26,22,.05);color:var(--ink)}
.nav-link.is-active{color:var(--ink);font-weight:600}
.nav-link.is-active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:0;
  height:3px;border-radius:3px;background:var(--volt);
}
.header-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.command-search{
  display:flex;align-items:center;gap:8px;
  width:250px;height:42px;padding:0 12px;
  background:var(--surface);
  border:1px solid var(--line);border-radius:12px;
  transition:border-color .18s ease, box-shadow .18s ease;
}
.command-search:focus-within{
  border-color:var(--volt);
  box-shadow:0 0 0 3px rgba(200,249,75,.35);
}
.command-search svg{width:16px;height:16px;stroke:var(--muted);fill:none;stroke-width:1.8;flex-shrink:0}
.command-search input{
  border:0;outline:0;background:transparent;width:100%;
  font-size:14px;color:var(--ink);
}
.command-search input::placeholder{color:#8A9994}
.kbd{
  font-size:11px;letter-spacing:.08em;color:var(--muted);
  background:var(--paper-2);border:1px solid var(--line);
  border-radius:6px;padding:2px 6px;flex-shrink:0;
}
.header-link{font-size:14.5px;color:#33443E;font-weight:500;white-space:nowrap}
.header-link:hover{color:var(--ink)}
.menu-btn{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line);background:var(--surface);
  align-items:center;justify-content:center;cursor:pointer;
}
.menu-btn svg{width:20px;height:20px;stroke:var(--ink);stroke-width:1.8;fill:none;stroke-linecap:round}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;cursor:pointer;
  border:1.5px solid transparent;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease;
}
.btn svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .18s ease}
.btn-primary{background:var(--volt);color:var(--ink)}
.btn-primary:hover{background:#BCEC3C;box-shadow:var(--sh-1);transform:translateY(-1px);color:var(--ink)}
.btn-primary:hover svg{transform:translateX(4px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:rgba(14,26,22,.06);color:var(--ink)}
.btn-ghost:hover svg{transform:translateX(4px)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-on-dark{background:var(--volt);color:var(--ink)}
.btn-on-dark:hover{background:#BCEC3C;box-shadow:0 16px 34px -18px rgba(0,0,0,.6);color:var(--ink)}

/* ---------- 通用排版 ---------- */
.eyebrow{
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  font-weight:700;color:var(--muted);
}
.badge-volt{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(200,249,75,.25);
  border:1px solid rgba(200,249,75,.6);
  color:var(--ink);font-size:12.5px;font-weight:600;
  padding:5px 12px;border-radius:999px;
}
.badge-ember{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(255,92,54,.12);
  border:1px solid rgba(255,92,54,.4);
  color:#B33A1C;font-size:12.5px;font-weight:600;
  padding:5px 12px;border-radius:999px;
}
.badge-mute{
  display:inline-flex;align-items:center;
  background:var(--paper-2);border:1px solid var(--line);
  color:var(--muted);font-size:12.5px;font-weight:600;
  padding:5px 12px;border-radius:999px;
}
.sec-num{
  font-size:40px;font-weight:800;color:var(--volt);
  line-height:1;letter-spacing:-.02em;display:block;
}
.sec-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:18px}
.sec-head .bar{width:48px;height:3px;background:var(--volt);border-radius:3px;margin-top:14px;flex-shrink:0}
.sec-title{font-size:clamp(26px,3vw,38px);font-weight:700;line-height:1.25;letter-spacing:-.015em}
.sec-desc{color:var(--muted);font-size:16px;max-width:720px}
section{padding:64px 0}
@media(min-width:1024px){section{padding:104px 0}}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 面包屑 ---------- */
.crumb{padding:20px 0 0;font-size:13px;color:var(--muted)}
.crumb a:hover{color:var(--ink)}
.crumb span.sep{margin:0 8px;color:#A6B2AE}
.crumb .current{color:var(--ink);font-weight:600}
.crumb-line{height:1px;background:var(--line);margin-top:18px}

/* ---------- Hero（强排版标题组） ---------- */
.hero-typo{padding:64px 0 56px}
@media(min-width:1024px){.hero-typo{padding:96px 0 88px}}
.hero-grid{display:grid;gap:48px}
@media(min-width:1024px){.hero-grid{grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:64px}}
.hero-typo h1{
  font-size:clamp(38px,5.4vw,72px);
  font-weight:800;line-height:1.08;letter-spacing:-.02em;
  margin:18px 0 0;
}
.hero-typo h1 em{font-style:normal;color:var(--ink-2);box-shadow:inset 0 -14px 0 rgba(200,249,75,.55)}
.hero-lead{margin-top:22px;font-size:17px;color:var(--muted);max-width:640px;line-height:1.85}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.index-card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);box-shadow:var(--sh-1);
  padding:26px 26px 20px;
}
.index-card h2{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:14px}
.index-list li{border-top:1px solid var(--line)}
.index-list li:first-child{border-top:0}
.index-list a{display:flex;gap:14px;align-items:baseline;padding:14px 0;font-size:15.5px;font-weight:600}
.index-list a:hover{color:var(--ink-2)}
.index-list .no{font-size:13px;font-weight:800;color:var(--volt);flex-shrink:0;width:22px;letter-spacing:.04em}
.index-list small{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:2px}

/* ---------- 图文交替行 ---------- */
.flow{padding:56px 0}
@media(min-width:1024px){.flow{padding:88px 0}}
.flow-row{
  display:grid;gap:28px;align-items:center;
  padding:40px 0;
  border-top:1px solid var(--line);
}
@media(min-width:1024px){
  .flow-row{grid-template-columns:1fr 1fr;gap:56px;padding:56px 0}
  .flow-row.reverse .flow-media{order:2}
}
.flow-media{
  border-radius:var(--r-img);overflow:hidden;
  background:var(--paper-2);border:1px solid var(--line);
  aspect-ratio:16/10;
}
.flow-media img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.flow-media:hover img{transform:scale(1.03)}
.flow-body h3{font-size:clamp(21px,2.2vw,26px);font-weight:700;letter-spacing:-.01em;margin:12px 0 14px}
.flow-body p{color:var(--muted);font-size:16px}
.check-list{margin-top:18px;display:grid;gap:10px}
.check-list li{display:flex;gap:10px;font-size:15px;color:#2C3C37}
.check-list li::before{
  content:"";width:8px;height:8px;border-radius:2px;
  background:var(--volt);flex-shrink:0;margin-top:9px;
}

/* ---------- 准备清单卡 ---------- */
.prep-grid{display:grid;gap:20px;margin-top:36px}
@media(min-width:768px){.prep-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.prep-grid{grid-template-columns:repeat(4,1fr)}}
.card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);box-shadow:var(--sh-1);
  padding:26px;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:rgba(200,249,75,.6)}
.card .no{font-size:26px;font-weight:800;color:var(--volt);letter-spacing:-.02em}
.card h3{font-size:18px;font-weight:700;margin:10px 0 8px}
.card p{font-size:14.5px;color:var(--muted)}
.card-icon{
  width:44px;height:44px;border-radius:12px;background:var(--paper-2);
  display:flex;align-items:center;justify-content:center;margin-bottom:14px;
}
.card-icon svg{width:22px;height:22px;stroke:var(--ink-2);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* ---------- 规格条 ---------- */
.spec-strip{
  margin-top:40px;border:1px solid var(--line);border-radius:var(--r-card);
  background:var(--paper-2);overflow:hidden;
  display:grid;
}
@media(min-width:768px){.spec-strip{grid-template-columns:repeat(4,1fr)}}
.spec-cell{padding:24px;border-top:1px solid var(--line)}
@media(min-width:768px){
  .spec-cell{border-top:0;border-left:1px solid var(--line)}
  .spec-cell:first-child{border-left:0}
}
.spec-cell .k{font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700}
.spec-cell .v{font-size:17px;font-weight:700;margin-top:8px}
.spec-cell .s{font-size:13.5px;color:var(--muted);margin-top:4px}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:840px;margin:36px auto 0}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 4px;font-size:17px;font-weight:600;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary .plus{
  width:26px;height:26px;flex-shrink:0;border-radius:8px;
  border:1px solid var(--line);background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  color:var(--ink-2);font-weight:700;transition:transform .24s ease, background-color .24s ease;
}
.faq-item[open] summary .plus{transform:rotate(45deg);background:var(--volt);border-color:var(--volt)}
.faq-item .answer{padding:0 4px 22px;font-size:15px;color:var(--muted);line-height:1.85;max-width:760px}

/* ---------- CTA ---------- */
.cta-block{
  background:var(--ink-2);border-radius:24px;color:var(--paper);
  padding:48px 28px;
  position:relative;overflow:hidden;
}
@media(min-width:1024px){.cta-block{padding:64px 56px}}
.cta-block::after{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 1px, transparent 1px 14px);
  pointer-events:none;
}
.cta-inner{position:relative;z-index:1;display:grid;gap:26px;align-items:center}
@media(min-width:1024px){.cta-inner{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:48px}}
.cta-inner h2{font-size:clamp(25px,3vw,36px);font-weight:700;line-height:1.24;letter-spacing:-.015em;color:#fff}
.cta-inner p{color:rgba(245,243,236,.78);margin-top:12px;font-size:16px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}

/* ---------- 相关分类 ---------- */
.related-grid{display:grid;gap:18px;margin-top:34px}
@media(min-width:768px){.related-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.related-grid{grid-template-columns:repeat(4,1fr)}}
.related-card{
  display:flex;flex-direction:column;gap:10px;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:22px;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.related-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:rgba(200,249,75,.6)}
.related-card .idx{font-size:13px;font-weight:800;color:var(--volt);letter-spacing:.06em}
.related-card h3{font-size:17px;font-weight:700}
.related-card p{font-size:14px;color:var(--muted)}
.related-card .go{font-size:14px;font-weight:600;color:var(--ink-2);display:inline-flex;align-items:center;gap:6px;margin-top:auto}
.related-card:hover .go{color:var(--ink)}
.related-card .go svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .18s ease}
.related-card:hover .go svg{transform:translateX(4px)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:rgba(245,243,236,.8);margin-top:20px}
.footer-grid{
  display:grid;gap:36px;padding:64px 0 40px;
}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-mark{background:var(--volt);color:var(--ink-2)}
.footer-brand .brand-text strong,.footer-brand .brand-text span{color:#fff;font-size:16.5px;font-weight:800;line-height:1.2}
.footer-brand .brand-text small{display:block;font-size:11.5px;font-weight:400;color:rgba(245,243,236,.6);letter-spacing:.05em;margin-top:3px}
.footer-grid p{font-size:14px;line-height:1.85;color:rgba(245,243,236,.72);max-width:340px}
.footer-title{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:rgba(245,243,236,.55);font-weight:700;margin-bottom:16px}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:14.5px;color:rgba(245,243,236,.82)}
.footer-links a:hover{color:var(--volt)}
.footer-contact{display:grid;gap:12px}
.footer-contact div{display:flex;align-items:center;gap:10px;font-size:14px;color:rgba(245,243,236,.78)}
.footer-contact svg{width:20px;height:20px;stroke:var(--volt);fill:none;flex-shrink:0}
.footer-bottom{
  border-top:1px solid rgba(245,243,236,.14);
  padding:20px 0 32px;display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;font-size:13px;color:rgba(245,243,236,.6);
}
.footer-bottom a{color:rgba(245,243,236,.8);text-decoration:underline}
.footer-bottom a:hover{color:var(--volt)}

/* ---------- 移动端导航抽屉 ---------- */
.mobile-drawer{
  display:none;
  border-top:1px solid var(--line);
  background:rgba(245,243,236,.98);
  padding:16px 0 22px;
}
.mobile-drawer.open{display:block}
.mobile-drawer .drawer-nav{display:grid;gap:4px;margin-bottom:14px}
.mobile-drawer .drawer-nav a{
  padding:11px 12px;border-radius:10px;font-size:15px;font-weight:600;
  border:1px solid transparent;
}
.mobile-drawer .drawer-nav a.is-active{background:var(--surface);border-color:var(--line)}
.mobile-drawer .drawer-actions{display:flex;gap:12px;flex-wrap:wrap;padding:0 12px}

@media(max-width:1023px){
  .main-nav,.command-search,.header-link{display:none}
  .menu-btn{display:flex}
}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .4s cubic-bezier(.22,.61,.36,1), transform .4s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category4 */
:root{
    --ink:#0E1A16;
    --ink-2:#14302A;
    --volt:#C8F94B;
    --volt-deep:#7FA81E;
    --ember:#FF5C36;
    --paper:#F5F3EC;
    --paper-2:#EDEAE1;
    --surface:#FFFFFF;
    --line:rgba(14,26,22,.12);
    --muted:#4A5B55;
    --radius-card:16px;
    --radius-img:12px;
    --radius-btn:12px;
    --shadow-1:0 1px 2px rgba(14,26,22,.06), 0 12px 32px -12px rgba(14,26,22,.14);
    --shadow-2:0 20px 44px -16px rgba(14,26,22,.22);
    --ease:cubic-bezier(.22,.61,.36,1);
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
    font-size:16px;
    line-height:1.8;
    font-variant-numeric:tabular-nums;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;height:auto}
  a{color:inherit;text-decoration:none}
  button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
  input,select,textarea{font:inherit;color:inherit}
  h1,h2,h3,h4,p,ul,ol,figure{margin:0}
  ul,ol{padding:0;list-style:none}
  :focus-visible{outline:2px solid var(--volt);outline-offset:2px;border-radius:6px}

  .container-x{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
  @media (min-width:768px){.container-x{padding-left:32px;padding-right:32px}}
  @media (min-width:1280px){.container-x{padding-left:40px;padding-right:40px}}

  /* ---------- header ---------- */
  .site-header{
    position:sticky;top:0;z-index:50;
    background:rgba(245,243,236,.9);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line);
  }
  .header-inner{display:flex;align-items:center;gap:24px;height:72px;transition:height .25s var(--ease)}
  .site-header.is-scrolled .header-inner{height:64px}
  .brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
  .brand-mark{
    display:grid;place-items:center;width:40px;height:40px;border-radius:12px;
    background:var(--ink-2);color:var(--volt);font-weight:800;font-size:16px;letter-spacing:-.02em;
  }
  .brand-text{display:flex;flex-direction:column;font-weight:800;font-size:17px;line-height:1.1;letter-spacing:-.01em}
  .brand-text small{font-weight:400;font-size:11px;color:var(--muted);letter-spacing:.02em;margin-top:3px}
  .main-nav{display:flex;align-items:center;gap:2px;margin-left:4px}
  .nav-link{
    position:relative;padding:8px 10px;font-size:14.5px;font-weight:500;color:#33443F;border-radius:8px;
    transition:color .18s var(--ease),background-color .18s var(--ease);white-space:nowrap;
  }
  .nav-link:hover{color:var(--ink);background:rgba(14,26,22,.05)}
  .nav-link.is-active{font-weight:700;color:var(--ink)}
  .nav-link.is-active::after{
    content:"";position:absolute;left:10px;right:10px;bottom:1px;height:3px;border-radius:2px;background:var(--volt);
  }
  .header-tools{display:flex;align-items:center;gap:14px;margin-left:auto}
  .search-box{
    display:flex;align-items:center;gap:8px;width:250px;height:40px;padding:0 10px 0 12px;
    background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-btn);
    transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
  }
  .search-box:focus-within{border-color:var(--volt);box-shadow:0 0 0 2px rgba(200,249,75,.35)}
  .search-box svg{width:16px;height:16px;stroke:var(--muted);flex-shrink:0}
  .search-box input{flex:1;min-width:0;border:0;background:transparent;outline:none;font-size:14px}
  .search-box input::placeholder{color:#87968F}
  .kbd{
    font-size:11px;letter-spacing:.08em;color:var(--muted);background:var(--paper-2);
    border:1px solid var(--line);border-radius:6px;padding:1px 5px;flex-shrink:0;
  }
  .text-link-quick{font-size:14px;font-weight:600;color:#33443F;transition:color .18s var(--ease)}
  .text-link-quick:hover{color:var(--ink)}
  .menu-btn{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:var(--surface);align-items:center;justify-content:center}
  .menu-btn svg{width:20px;height:20px;stroke:var(--ink)}

  /* ---------- buttons ---------- */
  .btn-primary{
    display:inline-flex;align-items:center;gap:8px;
    background:var(--volt);color:var(--ink);font-weight:600;font-size:15px;
    padding:14px 26px;border-radius:var(--radius-btn);border:1px solid transparent;
    transition:filter .18s var(--ease),box-shadow .18s var(--ease),transform .18s var(--ease);
  }
  .btn-primary:hover{filter:brightness(.94);box-shadow:var(--shadow-2);transform:translateY(-1px)}
  .btn-primary:active{transform:translateY(0) scale(.995)}
  .btn-primary svg{width:16px;height:16px;transition:transform .18s var(--ease)}
  .btn-primary:hover svg{transform:translateX(4px)}
  .btn-primary.btn-sm{padding:10px 18px;font-size:14px}
  .btn-ghost{
    display:inline-flex;align-items:center;gap:8px;
    background:transparent;color:var(--ink);font-weight:600;font-size:15px;
    padding:13px 24px;border-radius:var(--radius-btn);border:1.5px solid var(--ink);
    transition:background-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
  }
  .btn-ghost:hover{background:rgba(14,26,22,.06)}
  .btn-ghost:active{transform:translateY(1px)}
  .btn-ghost.on-dark{color:var(--paper);border-color:rgba(245,243,236,.55)}
  .btn-ghost.on-dark:hover{background:rgba(245,243,236,.12);border-color:var(--volt);color:var(--volt)}
  .text-link{
    display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:14.5px;color:var(--ink);
  }
  .text-link svg{width:15px;height:15px;transition:transform .18s var(--ease),stroke .18s var(--ease)}
  .text-link:hover svg{transform:translateX(4px);stroke:var(--volt-deep)}

  /* ---------- badges ---------- */
  .badge-volt{
    display:inline-flex;align-items:center;gap:6px;
    background:rgba(200,249,75,.18);color:var(--ink);
    font-size:12px;font-weight:700;letter-spacing:.02em;
    padding:5px 12px;border-radius:999px;border:1px solid rgba(200,249,75,.5);
  }
  .badge-soft{
    display:inline-flex;align-items:center;gap:6px;
    background:var(--paper-2);color:var(--muted);
    font-size:12px;font-weight:600;padding:4px 11px;border-radius:999px;border:1px solid var(--line);
  }
  .badge-ember{
    display:inline-flex;align-items:center;gap:6px;
    background:rgba(255,92,54,.12);color:#B93A1A;
    font-size:12px;font-weight:700;padding:4px 11px;border-radius:999px;border:1px solid rgba(255,92,54,.3);
  }
  .eyebrow{font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;color:var(--muted)}

  /* ---------- mobile drawer ---------- */
  .mobile-drawer{
    position:fixed;inset:0;z-index:70;background:rgba(14,26,22,.5);
    opacity:0;visibility:hidden;transition:opacity .24s var(--ease),visibility .24s var(--ease);
  }
  .mobile-drawer.is-open{opacity:1;visibility:visible}
  .mobile-panel{
    background:var(--paper);border-radius:0 0 22px 22px;padding:22px 20px 26px;
    transform:translateY(-16px);transition:transform .28s var(--ease);max-height:100%;overflow-y:auto;
  }
  .mobile-drawer.is-open .mobile-panel{transform:none}
  .drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
  .drawer-close{width:40px;height:40px;border:1px solid var(--line);border-radius:12px;background:var(--surface);display:grid;place-items:center}
  .drawer-close svg{width:18px;height:18px;stroke:var(--ink)}
  .drawer-nav{display:flex;flex-direction:column;gap:4px;margin:18px 0}
  .drawer-nav a{padding:12px 12px;border-radius:12px;font-weight:600;font-size:16px;border:1px solid transparent}
  .drawer-nav a:hover{background:var(--surface);border-color:var(--line)}
  .drawer-nav a.is-active{background:var(--surface);border-color:rgba(200,249,75,.6)}

  /* ---------- hero ---------- */
  .hero{position:relative;overflow:hidden;background:var(--ink-2);color:var(--paper)}
  .hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.4}
  .hero-veil{
    position:absolute;inset:0;
    background:linear-gradient(102deg,rgba(20,48,42,.97) 0%,rgba(14,26,22,.9) 46%,rgba(14,26,22,.6) 100%);
  }
  .hero-inner{
    position:relative;z-index:2;display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center;
    padding-top:44px;padding-bottom:84px;
  }
  .breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:rgba(245,243,236,.72);margin-bottom:22px}
  .breadcrumb a:hover{color:var(--volt)}
  .breadcrumb span.sep{opacity:.5}
  .hero h1{
    font-size:clamp(32px,4.6vw,58px);font-weight:800;line-height:1.08;letter-spacing:-.02em;
    margin:16px 0 20px;max-width:16em;
  }
  .hero-sub{font-size:17px;line-height:1.85;color:rgba(245,243,236,.82);max-width:34em}
  .hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
  .hero-points{
    display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px;
    padding-top:26px;border-top:1px solid rgba(245,243,236,.18);
  }
  .hero-points .num{font-size:30px;font-weight:700;line-height:1.1;color:var(--volt);letter-spacing:-.02em}
  .hero-points .lbl{font-size:12.5px;color:rgba(245,243,236,.68);margin-top:6px;letter-spacing:.02em}
  .hero-figure{position:relative;border-radius:var(--radius-card);overflow:hidden;background:rgba(20,48,42,.5);border:1px solid rgba(245,243,236,.2)}
  .hero-figure img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .3s var(--ease)}
  .hero-figure:hover img{transform:scale(1.03)}
  .hero-float{
    position:absolute;left:16px;bottom:16px;display:inline-flex;align-items:center;gap:8px;
    background:rgba(14,26,22,.86);color:var(--paper);font-size:12.5px;font-weight:600;
    padding:8px 14px;border-radius:999px;border:1px solid rgba(200,249,75,.45);
  }
  .hero-float i{width:8px;height:8px;border-radius:50%;background:var(--volt);display:block}

  /* ---------- sections ---------- */
  .section{padding:96px 0}
  .section.tight{padding:72px 0}
  .section.alt{background:var(--paper-2)}
  .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:46px}
  .section-head h2{font-size:clamp(26px,3vw,38px);font-weight:700;line-height:1.25;letter-spacing:-.01em;margin-top:10px}
  .section-head p{color:var(--muted);font-size:15.5px;max-width:34em;margin-top:12px}
  .num-big{font-size:38px;font-weight:800;line-height:1;letter-spacing:-.03em;color:var(--volt-deep)}

  /* ---------- cards ---------- */
  .card{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);padding:28px;
    transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
  }
  .card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.6)}
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
  .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
  .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
  .card h3{font-size:21px;font-weight:700;line-height:1.4;margin:18px 0 10px}
  .card p{color:var(--muted);font-size:15.5px;line-height:1.85}
  .icon-box{
    width:48px;height:48px;border-radius:14px;display:grid;place-items:center;
    background:rgba(200,249,75,.2);border:1px solid rgba(200,249,75,.5);
  }
  .icon-box svg{width:22px;height:22px;stroke:var(--ink);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
  .card-list{margin-top:20px;display:flex;flex-direction:column;gap:10px}
  .card-list li{display:flex;gap:10px;font-size:14.5px;color:#33443F;line-height:1.7}
  .card-list li::before{
    content:"";flex-shrink:0;width:7px;height:7px;margin-top:9px;border-radius:2px;background:var(--volt-deep);
  }

  /* ---------- steps ---------- */
  .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}
  .step{position:relative;padding-left:0}
  .step .step-line{
    display:block;height:3px;width:48px;background:var(--volt);border-radius:2px;margin-bottom:20px;
  }
  .step h3{font-size:19px;font-weight:700;margin:14px 0 10px}
  .step p{color:var(--muted);font-size:15px;line-height:1.85}
  .step::after{
    content:"";position:absolute;top:1px;right:-12px;width:24px;border-top:1px dashed rgba(14,26,22,.22);
  }
  .step:last-child::after{display:none}

  /* ---------- faq ---------- */
  .faq-wrap{max-width:1080px;margin:0 auto}
  .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px 28px;align-items:start}
  .faq-item{
    background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;
    transition:border-color .24s var(--ease),box-shadow .24s var(--ease);
  }
  .faq-item.is-open{border-color:rgba(200,249,75,.7);box-shadow:var(--shadow-1)}
  .faq-q{
    width:100%;display:flex;align-items:flex-start;justify-content:space-between;gap:16px;
    padding:18px 20px;font-size:16.5px;font-weight:600;text-align:left;line-height:1.6;
  }
  .faq-q .chev{
    flex-shrink:0;width:22px;height:22px;border-radius:50%;border:1px solid var(--line);
    display:grid;place-items:center;transition:transform .24s var(--ease),background-color .24s var(--ease);
  }
  .faq-q .chev svg{width:12px;height:12px;stroke:var(--ink);stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}
  .faq-item.is-open .faq-q .chev{transform:rotate(180deg);background:var(--volt)}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease)}
  .faq-a p{padding:0 20px 20px;font-size:15px;line-height:1.85;color:var(--muted)}

  /* ---------- cta band ---------- */
  .cta-band{
    position:relative;overflow:hidden;background:var(--ink-2);color:var(--paper);
    border-radius:24px;padding:56px;display:grid;grid-template-columns:1fr auto;gap:36px;align-items:center;
  }
  .cta-band::before{
    content:"";position:absolute;inset:0;
    background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.035) 0 2px,transparent 2px 14px);
    pointer-events:none;
  }
  .cta-band h2{position:relative;font-size:clamp(24px,2.8vw,34px);font-weight:700;line-height:1.28;letter-spacing:-.01em}
  .cta-band p{position:relative;margin-top:14px;font-size:15.5px;color:rgba(245,243,236,.78);max-width:38em}
  .cta-band .cta-actions{position:relative;display:flex;gap:14px;flex-wrap:wrap}

  /* ---------- form ---------- */
  .form-shell{display:grid;grid-template-columns:.85fr 1.15fr;gap:40px;align-items:start}
  .form-note{display:flex;flex-direction:column;gap:16px;margin-top:22px}
  .form-note li{display:flex;gap:12px;font-size:15px;color:#33443F;line-height:1.8}
  .form-note svg{width:20px;height:20px;flex-shrink:0;margin-top:5px;stroke:var(--volt-deep);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
  .contact-form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:var(--shadow-1);padding:30px}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
  .field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px}
  .field label{font-size:13px;font-weight:600;color:var(--ink)}
  .field input,.field select,.field textarea{
    width:100%;border:1px solid var(--line);border-radius:var(--radius-btn);background:var(--paper);
    padding:12px 14px;font-size:15px;outline:none;
    transition:border-color .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease);
  }
  .field input,.field select{height:48px}
  .field textarea{min-height:120px;resize:vertical;line-height:1.7}
  .field input:focus,.field select:focus,.field textarea:focus{
    border-color:var(--volt);background:var(--surface);box-shadow:0 0 0 2px rgba(200,249,75,.35);
  }
  .field .hint{font-size:12.5px;color:var(--muted)}
  .form-tip{
    display:none;margin-top:16px;font-size:14px;color:var(--ink);
    background:rgba(200,249,75,.2);border:1px solid rgba(200,249,75,.55);
    border-radius:12px;padding:12px 16px;
  }
  .form-tip.is-show{display:block}

  /* ---------- related ---------- */
  .rel-card{
    display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);
    border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-1);
    transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
  }
  .rel-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,249,75,.6)}
  .rel-card img{width:100%;aspect-ratio:16/9;object-fit:cover;background:var(--paper-2)}
  .rel-card .rel-body{padding:20px 22px 24px}
  .rel-card h3{font-size:18px;font-weight:700;margin-bottom:8px}
  .rel-card p{font-size:14.5px;color:var(--muted);line-height:1.8}

  /* ---------- footer ---------- */
  .site-footer{background:var(--ink);color:rgba(245,243,236,.8);padding:72px 0 28px;margin-top:0}
  .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}
  .footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
  .footer-brand .brand-mark{background:rgba(245,243,236,.08);border:1px solid rgba(245,243,236,.18)}
  .footer-brand .brand-text{color:var(--paper);font-size:17px;font-weight:800;display:flex;flex-direction:column;line-height:1.1}
  .footer-brand .brand-text small{font-size:11px;font-weight:400;color:rgba(245,243,236,.6);margin-top:3px}
  .site-footer p{font-size:14.5px;line-height:1.85;color:rgba(245,243,236,.72)}
  .footer-title{font-size:14px;font-weight:700;color:var(--paper);margin-bottom:16px;letter-spacing:.02em}
  .footer-links{display:flex;flex-direction:column;gap:11px}
  .footer-links a{font-size:14.5px;color:rgba(245,243,236,.78);transition:color .18s var(--ease)}
  .footer-links a:hover{color:var(--volt)}
  .footer-contact{display:flex;flex-direction:column;gap:14px}
  .footer-contact div{display:flex;gap:10px;font-size:14px;color:rgba(245,243,236,.78);line-height:1.7}
  .footer-contact svg{width:20px;height:20px;flex-shrink:0;margin-top:4px;stroke:var(--volt);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
  .footer-bottom{
    display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;align-items:center;
    margin-top:48px;padding-top:22px;border-top:1px solid rgba(245,243,236,.16);
    font-size:13px;color:rgba(245,243,236,.62);
  }
  .footer-bottom a{color:var(--volt)}

  /* ---------- motion ---------- */
  .reveal{opacity:0;transform:translateY(16px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
  .reveal.is-in{opacity:1;transform:none}

  /* ---------- responsive ---------- */
  @media (max-width:1023px){
    .main-nav,.search-box,.text-link-quick{display:none}
    .menu-btn{display:flex}
    .hero-inner{grid-template-columns:1fr;gap:36px;padding-top:40px;padding-bottom:64px}
    .grid-4{grid-template-columns:repeat(2,1fr)}
    .steps{grid-template-columns:repeat(2,1fr);gap:32px}
    .step::after{display:none}
    .form-shell{grid-template-columns:1fr;gap:32px}
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
    .cta-band{grid-template-columns:1fr;padding:40px;gap:26px}
  }
  @media (max-width:767px){
    .section{padding:56px 0}
    .section.tight{padding:48px 0}
    .grid-3,.grid-2,.faq-grid,.grid-4{grid-template-columns:1fr}
    .steps{grid-template-columns:1fr;gap:26px}
    .hero h1{font-size:32px}
    .hero-points{grid-template-columns:1fr;gap:16px}
    .hero-points .num{font-size:26px}
    .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:32px}
    .card{padding:22px}
    .contact-form{padding:22px}
    .form-row{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr}
    .cta-band{padding:28px;border-radius:20px}
  }
  @media (prefers-reduced-motion:reduce){
    *,*::before,*::after{animation:none !important;transition:none !important}
    .reveal{opacity:1;transform:none}
    html{scroll-behavior:auto}
  }