/* roulang page: index */
:root{
  --ink-900:#101216;
  --ink-700:#2B2F36;
  --ink-500:#5C636D;
  --ink-300:#9AA0A8;
  --line:#E3E1DB;
  --bg:#F5F4F0;
  --surface:#FFFFFF;
  --brand:#C7F24E;
  --brand-soft:#F2FBD9;
  --brand-deep:#7FA61A;
  --accent:#FF5C36;
  --soft-bg:#FAFAF6;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:20px;
  --r-pill:999px;
  --shadow-1:0 1px 2px rgba(16,18,22,.04),0 8px 24px -12px rgba(16,18,22,.10);
  --shadow-2:0 2px 4px rgba(16,18,22,.06),0 20px 40px -20px rgba(16,18,22,.18);
  --bs-primary:#101216;
  --bs-body-color:#2B2F36;
  --bs-body-font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --bs-border-radius:14px;
  --bs-border-color:#E3E1DB;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--ink-900);text-decoration:none;transition:color .18s}
a:hover{color:var(--brand-deep)}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-deep);outline-offset:2px}
.container{max-width:1200px;padding-left:24px;padding-right:24px}
.num{font-variant-numeric:tabular-nums;font-family:Inter,"SF Pro Display",system-ui,sans-serif}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:1030;background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 2px rgba(16,18,22,.04);
  transition:height .2s ease,box-shadow .2s ease;
}
.header-inner{display:flex;align-items:center;gap:28px;height:72px;transition:height .2s ease}
.site-header.scrolled{box-shadow:0 4px 18px -10px rgba(16,18,22,.28)}
.site-header.scrolled .header-inner{height:64px}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{
  width:40px;height:40px;border-radius:10px;background:var(--ink-900);
  display:flex;align-items:center;justify-content:center;flex:0 0 auto;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-line1{font-size:16px;font-weight:700;color:var(--ink-900);letter-spacing:.01em}
.brand-line2{font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--ink-500);margin-top:3px}
.main-nav{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-link{
  position:relative;font-size:16px;font-weight:500;color:var(--ink-700);
  padding:6px 0;white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--brand);transform:scaleX(0);transform-origin:left;transition:transform .24s ease;
}
.nav-link:hover{color:var(--ink-900)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--ink-900);font-weight:700}
.nav-link.active::after{transform:scaleX(1)}
.header-right{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.header-search{position:relative;display:flex;align-items:center}
.header-search .s-icon{position:absolute;left:13px;color:var(--ink-500);pointer-events:none;display:flex}
.header-search input{
  height:40px;width:220px;border-radius:var(--r-pill);
  background:#F3F2EE;border:1px solid transparent;
  padding:0 16px 0 38px;font-size:14px;color:var(--ink-900);
  transition:width .2s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.header-search input::placeholder{color:var(--ink-300)}
.header-search input:focus{
  width:260px;background:#fff;border-color:var(--ink-900);
  box-shadow:0 0 0 3px rgba(199,242,78,.35);outline:none;
}
.btn-ink{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:10px;
  background:var(--ink-900);color:#fff;font-size:15px;font-weight:600;
  border:1px solid var(--ink-900);cursor:pointer;
  transition:background .18s,color .18s,border-color .18s,transform .18s;
}
.btn-ink:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);transform:translateY(-1px)}
.btn-ink:active{transform:translateY(0)}
.btn-ink svg{transition:transform .18s}
.btn-ink:hover svg{transform:translateX(2px)}
.header-cta{height:40px;padding:0 18px;font-size:14px;border-radius:var(--r-pill)}
.btn-line{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:10px;background:#fff;color:var(--ink-900);
  border:1px solid var(--ink-900);font-size:15px;font-weight:600;
  transition:background .18s,color .18s,transform .18s;
}
.btn-line:hover{background:var(--ink-900);color:#fff;transform:translateY(-1px)}
.btn-line:active{transform:translateY(0)}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;
  color:var(--ink-900);border-bottom:1px solid rgba(16,18,22,.35);
  padding-bottom:2px;text-underline-offset:3px;
}
.link-arrow svg{transition:transform .18s}
.link-arrow:hover{color:var(--brand-deep);border-color:var(--brand-deep)}
.link-arrow:hover svg{transform:translateX(3px)}
.nav-burger{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;
}
.nav-burger span{display:block;height:2px;width:18px;margin:0 auto;background:var(--ink-900);border-radius:2px;transition:transform .2s}
.nav-burger:hover{background:var(--soft-bg)}

/* ===== mobile drawer ===== */
.m-drawer{
  position:fixed;inset:0;z-index:1080;background:#fff;
  display:none;flex-direction:column;padding:20px 20px 28px;
}
.m-drawer.open{display:flex}
.m-drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:18px;border-bottom:1px solid var(--line)}
.m-drawer-close{
  width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;
  font-size:20px;line-height:1;color:var(--ink-900);
}
.m-drawer nav{display:flex;flex-direction:column;padding:8px 0;flex:1}
.m-drawer nav a{
  font-size:20px;font-weight:600;color:var(--ink-900);line-height:56px;
  border-bottom:1px solid var(--line);
}
.m-drawer nav a:hover{color:var(--brand-deep)}
.m-drawer .m-cta{width:100%;margin-top:auto}

/* ===== hero ===== */
.hero{position:relative;background:var(--bg);padding:72px 0 88px;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(16,18,22,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(16,18,22,.045) 1px,transparent 1px);
  background-size:28px 28px;
}
.hero .container{position:relative;z-index:1}
.hero-copy{max-width:640px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;height:26px;padding:0 12px;
  border-radius:var(--r-pill);background:var(--brand-soft);color:#3F5606;
  font-size:13px;font-weight:600;margin-bottom:22px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--brand-deep)}
.hero h1{
  font-size:clamp(34px,5vw,60px);font-weight:800;line-height:1.08;letter-spacing:-.02em;
  max-width:14em;
}
.hero h1 .hl{background:linear-gradient(transparent 62%,var(--brand) 62%);padding:0 2px}
.hero-sub{font-size:17px;line-height:1.75;color:var(--ink-500);margin-top:22px;max-width:30em}
.hero-actions{display:flex;align-items:center;gap:18px;margin-top:34px;flex-wrap:wrap}
.hero-stats{display:flex;align-items:center;gap:28px;margin-top:46px;flex-wrap:wrap}
.hero-stat{padding-right:28px;border-right:1px solid var(--line)}
.hero-stat:last-child{border-right:0;padding-right:0}
.hero-stat b{display:block;font-size:20px;font-weight:700;color:var(--ink-900);line-height:1.3}
.hero-stat span{font-size:13px;color:var(--ink-500)}
.hero-visual{position:relative}
.hero-visual img{
  width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:var(--r-lg);
  box-shadow:var(--shadow-1);background:#EFEEE9;
}
.hero-tag{
  position:absolute;left:18px;bottom:18px;display:inline-flex;align-items:center;gap:10px;
  background:var(--brand);color:#1A2200;border-radius:10px;padding:11px 15px;
  font-size:14px;font-weight:600;box-shadow:var(--shadow-1);
}

/* ===== sections ===== */
.section{padding:88px 0}
.section-tight{padding:72px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px;flex-wrap:wrap}
.section-head h2{font-size:clamp(26px,3.2vw,40px);line-height:1.2;letter-spacing:-.01em}
.section-lead{font-size:17px;line-height:1.75;color:var(--ink-500);margin-top:16px;max-width:34em}
.section-head .head-side{font-size:14px;color:var(--ink-500)}
.section-head .head-side a{color:var(--ink-900);font-weight:600;border-bottom:1px solid rgba(16,18,22,.35);padding-bottom:2px}
.section-head .head-side a:hover{color:var(--brand-deep);border-color:var(--brand-deep)}

/* step list */
.step-list{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;box-shadow:var(--shadow-1)}
.step-row{
  display:grid;grid-template-columns:64px 1fr 1.15fr;gap:24px;align-items:center;
  padding:26px 28px;border-bottom:1px solid var(--line);transition:background .18s;
}
.step-row:last-child{border-bottom:0}
.step-row:hover{background:var(--soft-bg)}
.step-row:hover .step-no{color:var(--ink-900)}
.step-no{
  font-size:14px;font-weight:700;color:var(--brand-deep);letter-spacing:.06em;
  font-variant-numeric:tabular-nums;font-family:Inter,"SF Pro Display",system-ui,sans-serif;
  transition:color .18s;
}
.step-row h3{font-size:20px;font-weight:600}
.step-row p{font-size:15px;line-height:1.75;color:var(--ink-500)}

/* data band */
.band{background:var(--ink-900);padding:88px 0}
.band-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.band-cell{padding:0 32px;border-left:1px solid #2B2F36}
.band-cell:first-child{border-left:0;padding-left:0}
.band-cell:last-child{padding-right:0}
.band-cell b{
  display:block;font-size:clamp(36px,4.4vw,54px);font-weight:700;color:var(--brand);
  line-height:1.1;font-variant-numeric:tabular-nums;
  font-family:Inter,"SF Pro Display",system-ui,sans-serif;
}
.band-cell span{display:block;font-size:14px;color:var(--ink-300);margin-top:10px}
.band-title{color:#fff;font-size:clamp(22px,2.4vw,30px);margin-bottom:40px;font-weight:700}

/* case cards */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.case-card{
  display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
  transition:transform .18s,box-shadow .18s,border-color .18s;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#D6D3CB}
.case-card:hover .case-thumb img{transform:scale(1.03)}
.case-thumb{overflow:hidden;background:#EFEEE9}
.case-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.case-feature{grid-column:span 2;display:grid;grid-template-columns:1.05fr 1fr}
.case-feature .case-thumb{aspect-ratio:16/10;height:100%}
.case-body{padding:26px 28px;display:flex;flex-direction:column;gap:12px}
.case-card:not(.case-feature) .case-thumb{aspect-ratio:16/10}
.case-body h3{font-size:21px;line-height:1.35}
.case-body p{font-size:15px;line-height:1.75;color:var(--ink-500)}
.tag{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--r-pill);
  background:var(--brand-soft);color:#3F5606;font-size:13px;font-weight:600;width:max-content;
}
.tag.dark{background:var(--ink-900);color:#fff}
.tag.outline{background:#fff;border:1px solid var(--line);color:var(--ink-500)}

/* zigzag */
.zigzag{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.zigzag + .zigzag{margin-top:72px}
.zigzag-media{border-radius:var(--r-lg);overflow:hidden;background:#EFEEE9}
.zigzag-media img{width:100%;aspect-ratio:5/4;object-fit:cover}
.zigzag-body h3{font-size:clamp(22px,2.4vw,30px);line-height:1.3;margin:18px 0 16px}
.zigzag-body ul{display:flex;flex-direction:column;gap:12px;margin-bottom:24px}
.zigzag-body li{
  position:relative;padding-left:20px;font-size:16px;line-height:1.75;color:var(--ink-700);
}
.zigzag-body li::before{
  content:"";position:absolute;left:0;top:12px;width:8px;height:8px;border-radius:2px;background:var(--brand);
}
.zigzag-no{
  display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  border-radius:50%;background:var(--ink-900);color:var(--brand);font-size:13px;font-weight:700;
  font-variant-numeric:tabular-nums;
}
.zigzag.reverse .zigzag-media{order:2}

/* cms list */
.cms-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.cms-card{
  display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-md);overflow:hidden;color:inherit;
  transition:transform .18s,box-shadow .18s,border-color .18s;
}
.cms-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#D6D3CB;color:inherit}
.cms-card:hover .cms-thumb img{transform:scale(1.03)}
.cms-thumb{aspect-ratio:16/10;overflow:hidden;background:#EFEEE9}
.cms-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.cms-body{padding:24px;display:flex;flex-direction:column;gap:12px;flex:1}
.cms-body h3{
  font-size:19px;line-height:1.4;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.8em;
}
.cms-body p{
  font-size:15px;line-height:1.7;color:var(--ink-500);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:3.4em;
}
.cms-meta{
  display:flex;align-items:center;justify-content:space-between;
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  font-size:13px;color:var(--ink-300);
}
.cms-card-feature{grid-column:span 2;display:grid;grid-template-columns:1.05fr 1fr}
.cms-card-feature .cms-thumb{aspect-ratio:16/10;height:100%}
.cms-card-feature .cms-body{padding:30px 32px}
.cms-card-feature .cms-body h3{font-size:24px;min-height:auto}
.empty-state{
  min-height:160px;border:1px dashed #D6D3CB;border-radius:var(--r-md);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  color:var(--ink-500);font-size:14px;text-align:center;padding:24px;
}
.empty-state svg{color:var(--ink-300)}
.empty-state .btn-line{height:40px;font-size:14px;padding:0 18px}

/* faq */
.faq-side h2{font-size:clamp(26px,3.2vw,38px);line-height:1.22}
.faq-side p{font-size:16px;line-height:1.8;color:var(--ink-500);margin-top:16px}
.faq-side .btn-line{margin-top:26px}
.faq-acc .accordion-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md) !important;
  margin-bottom:12px;overflow:hidden;
}
.faq-acc .accordion-item:last-child{margin-bottom:0}
.faq-acc .accordion-button{
  background:var(--surface);color:var(--ink-900);font-size:16px;font-weight:600;
  padding:20px 24px;box-shadow:none;line-height:1.6;
}
.faq-acc .accordion-button:not(.collapsed){background:var(--surface);color:var(--ink-900);box-shadow:none}
.faq-acc .accordion-button:focus{box-shadow:0 0 0 3px rgba(199,242,78,.35);border-color:var(--ink-900);z-index:1}
.faq-acc .accordion-button::after{
  content:"+";background-image:none;width:26px;height:26px;flex:0 0 26px;
  display:flex;align-items:center;justify-content:center;
  font-size:22px;font-weight:400;color:var(--ink-900);line-height:1;
  transform:none;transition:transform .22s ease;margin-left:16px;
}
.faq-acc .accordion-button:not(.collapsed)::after{transform:rotate(45deg);background-image:none}
.faq-acc .accordion-body{padding:0 24px 22px;font-size:15px;line-height:1.85;color:var(--ink-500)}

/* contact */
.contact-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:48px;box-shadow:var(--shadow-1)}
.contact-info li{display:flex;gap:14px;padding:18px 0;border-bottom:1px solid var(--line)}
.contact-info li:last-child{border-bottom:0}
.contact-info .ico{flex:0 0 24px;color:var(--brand-deep);margin-top:3px;display:flex}
.contact-info b{display:block;font-size:15px;font-weight:600;color:var(--ink-900)}
.contact-info span{font-size:15px;color:var(--ink-500)}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:30px}
.form-card label{display:block;font-size:13px;font-weight:600;color:var(--ink-900);margin-bottom:8px}
.req{color:var(--accent)}
.form-card .form-control,.form-card .form-select{
  height:46px;border-radius:var(--r-sm);border:1px solid var(--line);
  padding:0 14px;font-size:15px;color:var(--ink-900);background:#fff;
  transition:border-color .18s,box-shadow .18s;
}
.form-card textarea.form-control{height:120px;padding:12px 14px;line-height:1.7;resize:vertical}
.form-card .form-control::placeholder,.form-card textarea::placeholder{color:var(--ink-300)}
.form-card .form-control:focus,.form-card .form-select:focus{
  border-color:var(--ink-900);box-shadow:0 0 0 3px rgba(199,242,78,.35);outline:none;
}
.form-check-label{font-size:14px;line-height:1.7;color:var(--ink-500)}
.form-check-input{border-color:var(--line);border-radius:4px;width:18px;height:18px;margin-top:2px}
.form-check-input:checked{background-color:var(--ink-900);border-color:var(--ink-900)}
.form-check-input:focus{box-shadow:0 0 0 3px rgba(199,242,78,.35);border-color:var(--ink-900)}
.form-card .btn-ink{width:160px}
@media (max-width:767px){.form-card .btn-ink{width:100%}}

/* footer */
.site-footer{background:#0E1013;color:var(--ink-300);padding:64px 0 32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand .brand-mark{background:#fff}
.footer-brand .brand-line1{color:#fff}
.footer-brand .brand-line2{color:var(--ink-300)}
.footer-desc{font-size:14px;line-height:1.8;color:var(--ink-300);margin-top:18px;max-width:26em}
.footer-social{display:flex;gap:12px;margin-top:22px}
.footer-social a{
  width:36px;height:36px;border-radius:50%;border:1px solid #2B2F36;
  display:flex;align-items:center;justify-content:center;color:var(--ink-300);
  transition:color .18s,border-color .18s,transform .18s;
}
.footer-social a:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-2px)}
.footer-col h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:18px;letter-spacing:.04em}
.footer-col li{margin-bottom:12px}
.footer-col a,.footer-col span{font-size:14px;color:var(--ink-300);transition:color .18s,transform .18s;display:inline-block}
.footer-col a:hover{color:var(--brand);transform:translateX(2px)}
.footer-bottom{
  margin-top:48px;padding-top:24px;border-top:1px solid #2B2F36;
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-size:13px;color:var(--ink-300);
}
.footer-bottom .fb-left{display:flex;gap:18px;flex-wrap:wrap}
.to-top{
  width:40px;height:40px;border-radius:50%;border:1px solid var(--brand);background:transparent;
  color:var(--brand);display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background .18s,color .18s,transform .18s;
}
.to-top:hover{background:var(--brand);color:#1A2200;transform:translateY(-2px)}

/* reveal */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s cubic-bezier(.22,.61,.36,1),transform .5s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.06s}
.reveal.d2{transition-delay:.12s}
.reveal.d3{transition-delay:.18s}

/* responsive */
@media (max-width:1199px){
  .container{max-width:100%}
  .header-search input{width:180px}
  .header-search input:focus{width:210px}
}
@media (max-width:991px){
  .main-nav,.header-search{display:none}
  .nav-burger{display:flex}
  .hero{padding:52px 0 64px}
  .hero-visual{margin-top:36px}
  .hero-visual img{aspect-ratio:16/11}
  .section{padding:64px 0}
  .band{padding:64px 0}
  .band-grid{grid-template-columns:repeat(2,1fr);gap:32px 0}
  .band-cell{padding:0 24px}
  .band-cell:nth-child(odd){border-left:0;padding-left:0}
  .case-grid{grid-template-columns:1fr}
  .case-feature{grid-column:span 1;grid-template-columns:1fr}
  .case-feature .case-thumb{aspect-ratio:16/10}
  .cms-grid{grid-template-columns:1fr}
  .cms-card-feature{grid-column:span 1;grid-template-columns:1fr}
  .cms-card-feature .cms-thumb{aspect-ratio:16/10}
  .zigzag{grid-template-columns:1fr;gap:32px}
  .zigzag + .zigzag{margin-top:56px}
  .zigzag.reverse .zigzag-media{order:0}
  .contact-wrap{padding:32px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .faq-side{margin-bottom:32px}
}
@media (max-width:767px){
  .container{padding-left:20px;padding-right:20px}
  .header-inner{height:60px}
  .site-header.scrolled .header-inner{height:58px}
  .header-cta{display:none}
  .hero h1{font-size:clamp(30px,7.6vw,40px)}
  .hero-stats{gap:18px}
  .hero-stat{padding-right:18px}
  .step-row{grid-template-columns:44px 1fr;gap:6px 16px;padding:22px}
  .step-row p{grid-column:2}
  .section-head{margin-bottom:28px}
  .contact-wrap{padding:22px;border-radius:var(--r-md)}
  .form-card{padding:20px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .section{padding:48px 0}
  .band{padding:48px 0}
  .band-cell{padding:0 16px}
  .band-cell b{font-size:34px}
}
@media (max-width:575px){
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn-ink,.hero-actions .btn-line{width:100%}
  .hero::before{display:none}
  .band-grid{grid-template-columns:1fr}
  .band-cell{border-left:0;padding:0 0 20px;border-bottom:1px solid #2B2F36}
  .band-cell:last-child{border-bottom:0;padding-bottom:0}
  .footer-social{display:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0ms !important;transition-duration:0ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category1 */
:root{
  --ink-900:#101216;
  --ink-700:#2B2F36;
  --ink-500:#5C636D;
  --ink-300:#9AA0A8;
  --line:#E3E1DB;
  --line-strong:#D6D3CB;
  --bg:#F5F4F0;
  --surface:#FFFFFF;
  --brand:#C7F24E;
  --brand-soft:#F2FBD9;
  --brand-deep:#7FA61A;
  --accent:#FF5C36;
  --hover-bg:#FAFAF6;
  --thumb-bg:#EFEEE9;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:20px;
  --r-pill:999px;
  --shadow-1:0 1px 2px rgba(16,18,22,.04),0 8px 24px -12px rgba(16,18,22,.10);
  --shadow-2:0 2px 4px rgba(16,18,22,.06),0 20px 40px -20px rgba(16,18,22,.18);
  --font-cn:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-num:Inter,"SF Pro Display",system-ui,-apple-system,"PingFang SC",sans-serif;
  --bs-body-font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --bs-primary:#101216;
  --bs-border-radius:14px;
  --bs-body-color:#2B2F36;
  --bs-body-bg:#F5F4F0;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--ink-900);text-decoration:none;transition:color .18s ease;}
a:hover{color:var(--brand-deep);}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit;}
h1,h2,h3,h4,h5{margin:0;color:var(--ink-900);font-weight:700;line-height:1.25;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand-deep);outline-offset:2px;}
.container{
  width:100%;
  max-width:1200px!important;
  padding-left:24px!important;
  padding-right:24px!important;
  margin:0 auto;
}
.section{padding:88px 0;}
.section-tight{padding:64px 0;}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  margin-bottom:40px;
}
.section-head h2{
  font-size:clamp(26px,3.2vw,40px);
  letter-spacing:-0.01em;
}
.section-head p{
  margin-top:12px;
  font-size:17px;
  line-height:1.75;
  color:var(--ink-500);
  max-width:640px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:13px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-500);
  margin-bottom:16px;
}
.eyebrow::before{
  content:"";
  width:22px;height:2px;background:var(--brand);
  display:inline-block;
}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:15px;
  font-weight:600;
  color:var(--ink-900);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
  transition:color .18s ease;
}
.link-arrow span{transition:transform .2s ease;display:inline-block;}
.link-arrow:hover{color:var(--brand-deep);}
.link-arrow:hover span{transform:translateX(3px);}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:#FFFFFF;
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 2px rgba(16,18,22,.03);
  transition:box-shadow .2s ease;
}
.site-header.scrolled{
  box-shadow:0 4px 18px -8px rgba(16,18,22,.22);
}
.header-inner{
  height:72px;
  display:flex;
  align-items:center;
  gap:32px;
  transition:height .2s ease;
}
.site-header.scrolled .header-inner{height:64px;}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  text-decoration:none;
}
.brand-mark{
  width:40px;height:40px;
  border-radius:10px;
  background:var(--ink-900);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  flex:0 0 auto;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-line1{font-size:16px;font-weight:700;color:var(--ink-900);letter-spacing:-0.01em;}
.brand-line2{font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--ink-500);}
.main-nav{
  display:flex;
  align-items:center;
  gap:28px;
  margin-left:8px;
  flex:1 1 auto;
}
.nav-link{
  position:relative;
  font-size:16px;
  font-weight:500;
  color:var(--ink-700);
  padding:6px 2px;
  white-space:nowrap;
  transition:color .18s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:2px;
  background:var(--brand);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s cubic-bezier(.22,.61,.36,1);
}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1);}
.nav-link.active{color:var(--ink-900);font-weight:700;}
.nav-link.active::after{transform:scaleX(1);}
.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.nav-search{position:relative;display:block;}
.nav-search svg{
  position:absolute;
  left:14px;top:50%;
  transform:translateY(-50%);
  color:var(--ink-300);
  pointer-events:none;
}
.nav-search input{
  height:40px;
  width:220px;
  border-radius:var(--r-pill);
  background:#F3F2EE;
  border:1px solid transparent;
  padding:0 16px 0 38px;
  font-size:14px;
  color:var(--ink-900);
  transition:width .22s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.nav-search input::placeholder{color:var(--ink-300);}
.nav-search input:focus{
  width:260px;
  background:#FFFFFF;
  border-color:var(--ink-900);
  outline:none;
  box-shadow:0 0 0 3px rgba(199,242,78,.35);
}
.btn-nk{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:10px;
  background:var(--ink-900);
  color:#FFFFFF;
  font-size:15px;
  font-weight:600;
  border:1px solid var(--ink-900);
  cursor:pointer;
  transition:background .18s ease,color .18s ease,transform .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.btn-nk:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);transform:translateY(-1px);}
.btn-nk:active{transform:translateY(0);}
.btn-nk:disabled{opacity:.4;cursor:not-allowed;transform:none;}
.btn-pill{
  height:40px;
  padding:0 20px;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:var(--ink-900);
  color:#FFFFFF;
  border:1px solid var(--ink-900);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.btn-pill:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);}
.btn-ghost{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:10px;
  background:#FFFFFF;
  color:var(--ink-900);
  border:1px solid var(--ink-900);
  font-size:15px;
  font-weight:600;
  cursor:pointer;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.btn-ghost:hover{background:var(--ink-900);color:#FFFFFF;transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(0);}
.btn-sm-ghost{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:38px;
  padding:0 16px;
  border-radius:var(--r-sm);
  border:1px solid var(--line-strong);
  background:#FFFFFF;
  font-size:14px;
  font-weight:600;
  color:var(--ink-900);
  transition:border-color .18s ease,background .18s ease,transform .18s ease;
}
.btn-sm-ghost:hover{border-color:var(--ink-900);background:var(--hover-bg);transform:translateY(-1px);}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#FFFFFF;
  align-items:center;
  justify-content:center;
  cursor:pointer;
}
.nav-toggle span{
  display:block;
  width:18px;height:2px;
  background:var(--ink-900);
  border-radius:2px;
  position:relative;
  transition:background .18s ease;
}
.nav-toggle span::before,
.nav-toggle span::after{
  content:"";
  position:absolute;left:0;
  width:18px;height:2px;background:var(--ink-900);
  border-radius:2px;
  transition:transform .2s ease;
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}

/* ---------- 移动抽屉 ---------- */
.mobile-drawer{
  position:fixed;
  inset:0;
  z-index:1200;
  background:#FFFFFF;
  display:flex;
  flex-direction:column;
  padding:0;
  transform:translateX(100%);
  visibility:hidden;
  transition:transform .28s cubic-bezier(.22,.61,.36,1),visibility .28s;
}
.mobile-drawer.open{transform:translateX(0);visibility:visible;}
.drawer-head{
  height:60px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 20px;
  border-bottom:1px solid var(--line);
}
.drawer-close{
  width:40px;height:40px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#FFFFFF;
  font-size:20px;
  line-height:1;
  color:var(--ink-900);
  cursor:pointer;
}
.drawer-body{
  flex:1 1 auto;
  overflow-y:auto;
  padding:24px 20px;
}
.drawer-body a{
  display:block;
  font-size:20px;
  font-weight:600;
  line-height:56px;
  color:var(--ink-900);
  border-bottom:1px solid var(--line);
}
.drawer-body a.active{color:var(--brand-deep);}
.drawer-foot{
  padding:16px 20px 24px;
  border-top:1px solid var(--line);
  background:#FFFFFF;
}
.drawer-foot .btn-nk{width:100%;}

/* ---------- 分类 Hero ---------- */
.cat-hero{
  padding:56px 0 56px;
  background:var(--bg);
  background-image:
    linear-gradient(rgba(16,18,22,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(16,18,22,.03) 1px,transparent 1px);
  background-size:32px 32px;
  border-bottom:1px solid var(--line);
}
.cat-hero-grid{
  display:grid;
  grid-template-columns:1fr 380px;
  gap:56px;
  align-items:center;
}
.badge-soft{
  display:inline-flex;
  align-items:center;
  height:26px;
  padding:0 12px;
  border-radius:var(--r-pill);
  background:var(--brand-soft);
  color:#3E5410;
  font-size:13px;
  font-weight:600;
  letter-spacing:.01em;
}
.badge-dark{
  display:inline-flex;
  align-items:center;
  height:26px;
  padding:0 12px;
  border-radius:var(--r-pill);
  background:var(--ink-900);
  color:#FFFFFF;
  font-size:13px;
  font-weight:600;
}
.cat-hero h1{
  margin:18px 0 16px;
  font-size:clamp(28px,3.6vw,44px);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-0.02em;
  max-width:620px;
}
.cat-hero .hero-sub{
  font-size:17px;
  line-height:1.75;
  color:var(--ink-500);
  max-width:560px;
}
.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:28px;
  margin-top:28px;
  padding-top:24px;
  border-top:1px solid var(--line);
}
.hero-meta div{
  padding-right:28px;
  border-right:1px solid var(--line);
}
.hero-meta div:last-child{border-right:0;padding-right:0;}
.hero-meta strong{
  display:block;
  font-family:var(--font-num);
  font-size:20px;
  font-weight:700;
  color:var(--ink-900);
  font-variant-numeric:tabular-nums;
  line-height:1.3;
}
.hero-meta span{font-size:13px;color:var(--ink-500);}
.cat-hero-figure{
  margin:0;
  border-radius:var(--r-md);
  overflow:hidden;
  aspect-ratio:3/2;
  background:var(--thumb-bg);
  box-shadow:var(--shadow-1);
}
.cat-hero-figure img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .35s ease;
}
.cat-hero-figure:hover img{transform:scale(1.03);}

/* ---------- 侧栏布局 ---------- */
.cat-body{padding:72px 0 88px;}
.cat-layout{
  display:grid;
  grid-template-columns:260px 1fr;
  gap:48px;
  align-items:start;
}
.cat-side{
  position:sticky;
  top:96px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:24px 20px;
  box-shadow:var(--shadow-1);
}
.cat-side h2{
  font-size:18px;
  font-weight:700;
  letter-spacing:-0.01em;
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.side-nav{margin-top:12px;}
.side-nav li + li{margin-top:4px;}
.side-nav a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 14px;
  border-radius:var(--r-sm);
  font-size:15px;
  font-weight:500;
  color:var(--ink-700);
  transition:background .18s ease,color .18s ease;
}
.side-nav a .num{
  font-family:var(--font-num);
  font-size:12px;
  font-weight:600;
  color:var(--ink-300);
  font-variant-numeric:tabular-nums;
  transition:color .18s ease;
}
.side-nav a:hover{background:var(--hover-bg);color:var(--ink-900);}
.side-nav a:hover .num{color:var(--brand-deep);}
.side-nav a.active{
  background:var(--ink-900);
  color:#FFFFFF;
  font-weight:600;
}
.side-nav a.active .num{color:var(--brand);}
.side-note{
  margin-top:20px;
  padding:16px;
  border-radius:var(--r-sm);
  background:var(--brand-soft);
  font-size:13px;
  line-height:1.7;
  color:#3E5410;
}
.side-note strong{display:block;font-size:14px;margin-bottom:4px;color:#25340A;}

/* ---------- 内容卡片 ---------- */
.card-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.content-card{
  display:flex;
  flex-direction:column;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  box-shadow:var(--shadow-1);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
  height:100%;
}
.content-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-2);
  border-color:var(--line-strong);
}
.card-thumb{
  aspect-ratio:16/10;
  overflow:hidden;
  background:var(--thumb-bg);
}
.card-thumb img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .35s ease;
}
.content-card:hover .card-thumb img{transform:scale(1.03);}
.card-body{
  padding:20px 24px 24px;
  display:flex;
  flex-direction:column;
  flex:1 1 auto;
}
.card-body h3{
  margin:12px 0 8px;
  font-size:17px;
  font-weight:600;
  line-height:1.45;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.card-body p{
  font-size:14px;
  line-height:1.7;
  color:var(--ink-500);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.card-meta{
  margin-top:auto;
  padding-top:16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:13px;
  color:var(--ink-300);
  font-variant-numeric:tabular-nums;
}
.card-arrow{
  color:var(--ink-900);
  font-weight:700;
  transition:transform .2s ease,color .18s ease;
}
.content-card:hover .card-arrow{transform:translateX(3px);color:var(--brand-deep);}

/* ---------- 步骤列表 ---------- */
.step-list{
  border-top:1px solid var(--line);
}
.step-row{
  display:grid;
  grid-template-columns:72px 260px 1fr;
  gap:24px;
  align-items:baseline;
  padding:26px 20px;
  border-bottom:1px solid var(--line);
  transition:background .18s ease;
}
.step-row:hover{background:var(--hover-bg);}
.step-row .step-num{
  font-family:var(--font-num);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--brand-deep);
  font-variant-numeric:tabular-nums;
  transition:color .18s ease;
}
.step-row:hover .step-num{color:var(--ink-900);}
.step-row h3{
  font-size:20px;
  font-weight:600;
  line-height:1.4;
}
.step-row p{
  font-size:15px;
  line-height:1.75;
  color:var(--ink-500);
}

/* ---------- 提示对照 ---------- */
.hint-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:24px;
}
.hint-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:26px 28px;
  box-shadow:var(--shadow-1);
  transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.hint-card:hover{border-color:var(--line-strong);box-shadow:var(--shadow-2);transform:translateY(-3px);}
.hint-card h3{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:18px;
  font-weight:600;
  margin-bottom:12px;
}
.hint-card h3 .dot{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--brand);
  flex:0 0 auto;
}
.hint-card p{font-size:15px;line-height:1.8;color:var(--ink-500);}
.hint-card ul{margin-top:12px;}
.hint-card li{
  position:relative;
  padding-left:18px;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-700);
}
.hint-card li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:5px;height:5px;
  border-radius:50%;
  background:var(--brand-deep);
}
.hint-card li + li{margin-top:6px;}

/* ---------- 手风琴 ---------- */
.faq-list{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  transition:border-color .18s ease,box-shadow .18s ease;
}
.faq-item:hover{border-color:var(--line-strong);}
.faq-item.open{border-color:var(--line-strong);box-shadow:var(--shadow-1);}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:20px 24px;
  background:transparent;
  border:0;
  text-align:left;
  font-size:16px;
  font-weight:600;
  color:var(--ink-900);
  cursor:pointer;
  transition:background .18s ease;
}
.faq-q:hover{background:var(--hover-bg);}
.faq-icon{
  position:relative;
  width:18px;height:18px;
  flex:0 0 auto;
  transition:transform .22s ease;
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  background:var(--ink-900);
  border-radius:2px;
  transition:background .18s ease;
}
.faq-icon::before{left:0;top:8px;width:18px;height:2px;}
.faq-icon::after{left:8px;top:0;width:2px;height:18px;transition:transform .22s ease,background .18s ease;}
.faq-item.open .faq-icon::after{transform:scaleY(0);}
.faq-item.open .faq-icon::before{background:var(--brand-deep);}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .24s ease;
}
.faq-a-inner{
  padding:0 24px 22px;
  font-size:15px;
  line-height:1.85;
  color:var(--ink-500);
  border-top:1px solid transparent;
}
.faq-item.open .faq-a-inner{border-top-color:var(--line);padding-top:16px;}

/* ---------- CTA 带 ---------- */
.cta-band{
  background:var(--brand-soft);
  border-top:1px solid #E1EFC0;
  border-bottom:1px solid #E1EFC0;
  padding:56px 0;
}
.cta-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:40px;
}
.cta-inner h2{
  font-size:clamp(22px,2.6vw,32px);
  letter-spacing:-0.01em;
}
.cta-inner p{
  margin-top:10px;
  font-size:16px;
  color:#4A5B22;
  max-width:640px;
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:#0E1013;
  color:var(--ink-300);
  padding:64px 0 32px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.2fr;
  gap:48px;
  padding-bottom:48px;
}
.footer-brand .brand-line1{color:#FFFFFF;}
.footer-brand .brand-line2{color:var(--ink-300);}
.footer-brand .brand-mark{background:#1A1D22;}
.footer-desc{
  margin-top:18px;
  font-size:14px;
  line-height:1.85;
  color:var(--ink-300);
  max-width:320px;
}
.footer-social{
  display:flex;
  gap:12px;
  margin-top:20px;
}
.footer-social a{
  width:36px;height:36px;
  border-radius:10px;
  border:1px solid #2B2F36;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  color:var(--ink-300);
  transition:color .18s ease,border-color .18s ease,background .18s ease,transform .18s ease;
}
.footer-social a:hover{color:var(--brand);border-color:#3C424B;background:#171A1F;transform:translateY(-2px);}
.footer-col h4{
  font-size:14px;
  font-weight:700;
  color:#FFFFFF;
  letter-spacing:.04em;
  margin-bottom:18px;
}
.footer-col li + li{margin-top:10px;}
.footer-col a,
.footer-col span{
  font-size:14px;
  color:var(--ink-300);
  transition:color .18s ease,transform .18s ease;
  display:inline-block;
}
.footer-col a:hover{color:var(--brand);transform:translateX(2px);}
.footer-bottom{
  border-top:1px solid #2B2F36;
  padding-top:24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  font-size:13px;
  color:#7C838C;
}
.to-top{
  width:40px;height:40px;
  border-radius:50%;
  border:1px solid var(--brand);
  background:transparent;
  color:var(--brand);
  font-size:16px;
  line-height:1;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.to-top:hover{background:var(--brand);color:#1A2200;transform:translateY(-2px);}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s cubic-bezier(.22,.61,.36,1),transform .5s cubic-bezier(.22,.61,.36,1);
}
.reveal.in{opacity:1;transform:translateY(0);}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .cat-layout{grid-template-columns:230px 1fr;gap:32px;}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .cat-hero-grid{grid-template-columns:1fr 320px;gap:40px;}
  .section{padding:72px 0;}
}
@media (max-width:991px){
  .main-nav,.nav-search{display:none;}
  .nav-toggle{display:inline-flex;}
  .cat-hero-grid{grid-template-columns:1fr;}
  .cat-hero-figure{max-width:520px;}
  .cat-layout{grid-template-columns:1fr;gap:32px;}
  .cat-side{position:static;}
  .side-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;}
  .side-nav li + li{margin-top:0;}
  .step-row{grid-template-columns:56px 1fr;gap:12px 16px;}
  .step-row p{grid-column:1 / -1;padding-left:0;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
  .cta-inner{flex-direction:column;align-items:flex-start;gap:24px;}
  .section-head{flex-direction:column;align-items:flex-start;gap:20px;}
}
@media (max-width:767px){
  .container{padding-left:20px!important;padding-right:20px!important;}
  .header-inner{height:60px;gap:16px;}
  .site-header.scrolled .header-inner{height:60px;}
  .brand-mark{width:36px;height:36px;border-radius:9px;}
  .brand-line1{font-size:15px;}
  .brand-line2{font-size:10px;}
  .btn-pill{display:none;}
  .section{padding:48px 0;}
  .cat-hero{padding:40px 0;}
  .cat-body{padding:48px 0 56px;}
  .hero-meta{gap:20px;}
  .hero-meta div{padding-right:20px;}
  .card-grid{grid-template-columns:1fr;}
  .hint-grid{grid-template-columns:1fr;}
  .side-nav{grid-template-columns:1fr;}
  .step-row{padding:20px 8px;}
  .step-row h3{font-size:18px;}
  .faq-q{padding:16px 18px;font-size:15px;}
  .faq-a-inner{padding-left:18px;padding-right:18px;}
  .cta-band{padding:44px 0;}
  .footer-grid{grid-template-columns:1fr;gap:32px;padding-bottom:32px;}
  .site-footer{padding:48px 0 28px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .btn-nk{width:100%;}
}
@media (max-width:575px){
  .cat-hero{background-image:none;}
  .hero-meta{flex-direction:column;gap:14px;}
  .hero-meta div{border-right:0;padding-right:0;padding-bottom:14px;border-bottom:1px solid var(--line);width:100%;}
  .hero-meta div:last-child{padding-bottom:0;border-bottom:0;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    transition-duration:0ms!important;
    animation-duration:0ms!important;
    scroll-behavior:auto!important;
  }
  .reveal{opacity:1;transform:none;}
}

/* roulang page: article */
:root{
  --ink-900:#101216;
  --ink-700:#2B2F36;
  --ink-500:#5C636D;
  --ink-300:#9AA0A8;
  --line:#E3E1DB;
  --bg:#F5F4F0;
  --surface:#FFFFFF;
  --brand:#C7F24E;
  --brand-soft:#F2FBD9;
  --brand-deep:#7FA61A;
  --accent:#FF5C36;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:20px;
  --r-pill:999px;
  --shadow-1:0 1px 2px rgba(16,18,22,.04),0 8px 24px -12px rgba(16,18,22,.10);
  --shadow-2:0 2px 4px rgba(16,18,22,.06),0 20px 40px -20px rgba(16,18,22,.18);
  --font-cn:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-num:Inter,"SF Pro Display",system-ui,sans-serif;
  --bs-primary:#C7F24E;
  --bs-primary-rgb:199,242,78;
  --bs-body-font-family:var(--font-cn);
  --bs-body-color:#2B2F36;
  --bs-body-bg:#F5F4F0;
  --bs-border-color:#E3E1DB;
  --bs-border-radius:14px;
  --bs-link-color:#101216;
  --bs-link-hover-color:#7FA61A;
  --bs-emphasis-color:#101216;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;border:0}
a{color:var(--ink-900);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--brand-deep)}
button{font-family:inherit}
ul,ol{margin:0;padding:0}
p{margin:0}
h1,h2,h3,h4,h5{margin:0;color:var(--ink-900);font-weight:700}
:focus-visible{outline:2px solid var(--brand-deep);outline-offset:2px;border-radius:4px}
.container,.container-lg,.container-md,.container-sm,.container-xl{
  width:100%;
  max-width:1200px;
  margin-left:auto;
  margin-right:auto;
  padding-left:24px;
  padding-right:24px;
}
.section{padding:88px 0}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-300);
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--brand);border-radius:2px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.section-title{font-size:clamp(26px,3.2vw,40px);line-height:1.2;letter-spacing:-.02em}
.section-desc{font-size:17px;line-height:1.75;color:var(--ink-500);max-width:34em;margin-top:12px}

/* ---------- 按钮 ---------- */
.btn-main{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  height:48px;
  padding:0 24px;
  border-radius:10px;
  background:var(--ink-900);
  color:#fff;
  font-size:15px;
  font-weight:600;
  border:1px solid var(--ink-900);
  cursor:pointer;
  transition:background .18s,color .18s,transform .18s,border-color .18s;
}
.btn-main svg{transition:transform .18s}
.btn-main:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);transform:translateY(-1px)}
.btn-main:hover svg{transform:translateX(2px)}
.btn-main:active{transform:translateY(0)}
.btn-ghost{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  height:48px;
  padding:0 24px;
  border-radius:10px;
  background:#fff;
  color:var(--ink-900);
  font-size:15px;
  font-weight:600;
  border:1px solid var(--ink-900);
  cursor:pointer;
  transition:background .18s,color .18s,transform .18s;
}
.btn-ghost:hover{background:var(--ink-900);color:#fff;transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(0)}
.btn-ghost[disabled],.btn-main[disabled]{opacity:.4;cursor:not-allowed;transform:none}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:15px;
  font-weight:600;
  color:var(--ink-900);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-color:var(--line);
}
.link-arrow svg{transition:transform .18s}
.link-arrow:hover{color:var(--brand-deep);text-decoration-color:var(--brand-deep)}
.link-arrow:hover svg{transform:translateX(3px)}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:1030;
  background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 2px rgba(16,18,22,.03);
  transition:box-shadow .2s ease;
}
.nav-inner{
  display:flex;
  align-items:center;
  gap:24px;
  height:72px;
  transition:height .2s ease;
}
.site-header.is-scrolled{box-shadow:0 6px 24px -16px rgba(16,18,22,.35)}
.site-header.is-scrolled .nav-inner{height:64px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-mark{
  width:40px;
  height:40px;
  border-radius:10px;
  background:var(--ink-900);
  display:flex;
  align-items:center;
  justify-content:center;
  flex:0 0 auto;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-line1{font-size:16px;font-weight:700;color:var(--ink-900);letter-spacing:-.01em;white-space:nowrap}
.brand-line2{font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--ink-500);white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:28px;margin-left:8px}
.main-nav .nav-link{
  position:relative;
  font-size:16px;
  font-weight:500;
  color:var(--ink-700);
  padding:6px 0;
  white-space:nowrap;
}
.main-nav .nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--brand);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s ease;
}
.main-nav .nav-link:hover{color:var(--ink-900)}
.main-nav .nav-link:hover::after{transform:scaleX(1)}
.main-nav .nav-link.active{color:var(--ink-900);font-weight:700}
.main-nav .nav-link.active::after{transform:scaleX(1)}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.nav-search{position:relative;display:flex;align-items:center}
.nav-search svg{position:absolute;left:14px;color:var(--ink-300);pointer-events:none}
.nav-search input{
  width:220px;
  height:40px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  background:#F3F2EE;
  padding:0 16px 0 38px;
  font-size:14px;
  color:var(--ink-900);
  transition:width .22s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.nav-search input::placeholder{color:var(--ink-300)}
.nav-search input:focus{
  width:260px;
  background:#fff;
  border-color:var(--ink-900);
  outline:none;
  box-shadow:0 0 0 3px rgba(199,242,78,.35);
}
.btn-nav-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:42px;
  padding:0 20px;
  border-radius:var(--r-pill);
  background:var(--ink-900);
  color:#fff;
  font-size:15px;
  font-weight:600;
  border:1px solid var(--ink-900);
  transition:background .18s,color .18s,border-color .18s,transform .18s;
}
.btn-nav-cta:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);transform:translateY(-1px)}
.btn-nav-cta:active{transform:translateY(0)}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#fff;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  transition:border-color .18s,background .18s;
}
.nav-toggle:hover{border-color:var(--ink-900);background:#FAFAF6}

/* ---------- 移动端抽屉 ---------- */
.mobile-drawer{
  position:fixed;
  inset:0;
  z-index:1060;
  background:#fff;
  display:none;
  flex-direction:column;
  padding:18px 20px 0;
}
.mobile-drawer.is-open{display:flex}
.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.drawer-close{
  width:44px;height:44px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#fff;
  font-size:22px;
  line-height:1;
  color:var(--ink-900);
  cursor:pointer;
}
.drawer-close:hover{border-color:var(--ink-900)}
.drawer-nav{display:flex;flex-direction:column;padding:8px 0;overflow-y:auto}
.drawer-nav a{
  font-size:20px;
  font-weight:600;
  color:var(--ink-900);
  padding:16px 0;
  line-height:1.3;
  border-bottom:1px solid #F1F0EC;
}
.drawer-nav a:hover{color:var(--brand-deep)}
.drawer-foot{margin-top:auto;padding:18px 0;background:#0E1013;border-radius:var(--r-md) var(--r-md) 0 0;display:flex;padding:18px}
.drawer-foot .btn-nav-cta{width:100%;height:48px;background:var(--brand);color:#1A2200;border-color:var(--brand)}

/* ---------- 文章头部 ---------- */
.article-hero{
  padding:40px 0 0;
  background-color:var(--bg);
  background-image:
    linear-gradient(to right,rgba(16,18,22,.03) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(16,18,22,.03) 1px,transparent 1px);
  background-size:48px 48px;
}
.breadcrumb-nav{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  color:var(--ink-500);
  min-width:0;
}
.breadcrumb-nav a{color:var(--ink-500);white-space:nowrap}
.breadcrumb-nav a:hover{color:var(--ink-900)}
.breadcrumb-nav .sep{color:#C9C6BE}
.breadcrumb-nav .current{
  color:var(--ink-900);
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  max-width:280px;
}
.article-main{padding:32px 0 96px}
.article-shell{
  max-width:1040px;
  margin:0 auto;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:48px;
  align-items:start;
}
.article-col{min-width:0}
.badge-cat{
  display:inline-flex;
  align-items:center;
  height:26px;
  padding:0 12px;
  border-radius:var(--r-pill);
  background:var(--brand-soft);
  color:#41540E;
  font-size:12px;
  font-weight:600;
  letter-spacing:.02em;
  margin-top:22px;
}
.article-title{
  font-size:clamp(30px,4vw,44px);
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.02em;
  color:var(--ink-900);
  margin-top:16px;
  max-width:18em;
}
.article-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin-top:18px;
  font-size:13px;
  color:var(--ink-500);
}
.article-meta .dot{width:1px;height:12px;background:var(--line);display:inline-block}
.article-meta .num{font-family:var(--font-num);font-variant-numeric:tabular-nums}
.article-cover{
  margin-top:28px;
  border-radius:var(--r-lg);
  overflow:hidden;
  aspect-ratio:16/9;
  background:#EFEEE9;
  box-shadow:var(--shadow-1);
}
.article-cover img{width:100%;height:100%;object-fit:cover}

/* ---------- 正文排版 ---------- */
.article-body{
  margin-top:36px;
  font-size:17px;
  line-height:1.9;
  color:var(--ink-700);
  max-width:720px;
}
.article-body > *:first-child{margin-top:0}
.article-body p{margin:0 0 .9em}
.article-body h2{
  font-size:clamp(22px,2.4vw,28px);
  font-weight:700;
  line-height:1.32;
  color:var(--ink-900);
  margin:40px 0 16px;
  letter-spacing:-.01em;
  scroll-margin-top:96px;
}
.article-body h3{font-size:20px;font-weight:600;color:var(--ink-900);line-height:1.4;margin:28px 0 12px;scroll-margin-top:96px}
.article-body h4{font-size:17px;font-weight:600;color:var(--ink-900);margin:22px 0 10px}
.article-body blockquote{
  margin:24px 0;
  padding:20px 24px;
  background:#F7F6F2;
  border-left:3px solid var(--brand);
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  color:var(--ink-700);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body ul,.article-body ol{margin:0 0 1em;padding-left:1.4em}
.article-body ul li,.article-body ol li{margin-bottom:.4em}
.article-body li::marker{color:var(--brand-deep)}
.article-body a{
  color:var(--ink-900);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-color:var(--ink-300);
}
.article-body a:hover{color:var(--brand-deep);text-decoration-color:var(--brand-deep)}
.article-body strong{color:var(--ink-900);font-weight:700}
.article-body img{border-radius:12px;margin:24px auto;max-width:100%;height:auto}
.article-body figure{margin:24px 0}
.article-body figcaption{font-size:13px;color:var(--ink-500);text-align:center;margin-top:10px;line-height:1.6}
.article-body table{
  display:block;
  width:100%;
  max-width:100%;
  overflow-x:auto;
  border-collapse:collapse;
  font-size:15px;
  margin:24px 0;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
}
.article-body th,.article-body td{border:1px solid var(--line);padding:10px 14px;text-align:left;white-space:nowrap}
.article-body th{background:#F5F4F0;font-weight:600;color:var(--ink-900)}
.article-body hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.article-empty{
  margin-top:40px;
  background:#fff;
  border:1px dashed #D6D3CB;
  border-radius:var(--r-md);
  padding:56px 24px;
  text-align:center;
}
.article-empty h2{font-size:22px;margin-bottom:10px}
.article-empty p{color:var(--ink-500);font-size:15px;margin-bottom:22px}

/* ---------- 目录 ---------- */
.article-toc{position:sticky;top:96px;display:none}
.toc-title{
  font-family:var(--font-num);
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-300);
  margin-bottom:14px;
}
.toc-list{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc-list li a{
  display:block;
  padding:8px 0 8px 14px;
  margin-left:-1px;
  border-left:2px solid transparent;
  font-size:14px;
  line-height:1.5;
  color:var(--ink-500);
  transition:color .18s,border-color .18s;
}
.toc-list li a:hover{color:var(--ink-900)}
.toc-list li a.is-active{color:var(--ink-900);font-weight:600;border-left-color:var(--brand)}

/* ---------- 相关推荐 ---------- */
.related{margin-top:56px;border-top:1px solid var(--line);padding-top:32px}
.related-title{font-size:20px;font-weight:700;margin-bottom:20px;letter-spacing:-.01em}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.related-card{
  display:flex;
  gap:12px;
  padding:12px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  transition:transform .18s,box-shadow .18s,border-color .18s;
}
.related-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#D6D3CB;color:inherit}
.related-thumb{
  width:80px;height:80px;
  flex:0 0 auto;
  border-radius:10px;
  overflow:hidden;
  background:#EFEEE9;
}
.related-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.related-card:hover .related-thumb img{transform:scale(1.04)}
.related-info{min-width:0;display:flex;flex-direction:column;justify-content:center}
.related-info h3{
  font-size:15px;
  font-weight:600;
  line-height:1.4;
  color:var(--ink-900);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
  margin-bottom:6px;
}
.related-info time{font-size:12px;color:var(--ink-500);font-family:var(--font-num)}
.related-actions{margin-top:32px;display:flex;justify-content:center}

/* ---------- 提示带 ---------- */
.soft-cta{
  margin-top:56px;
  background:var(--brand-soft);
  border-radius:var(--r-lg);
  padding:32px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
}
.soft-cta h3{font-size:20px;font-weight:700;line-height:1.4;margin-bottom:6px}
.soft-cta p{font-size:15px;color:#4C5A24;line-height:1.7}

/* ---------- FAQ ---------- */
.faq-section{padding:88px 0;background:var(--bg);border-top:1px solid var(--line)}
.faq-grid{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.faq-side h2{font-size:clamp(26px,3vw,36px);line-height:1.25;letter-spacing:-.02em}
.faq-side p{font-size:16px;line-height:1.8;color:var(--ink-500);margin-top:14px;max-width:22em}
.faq-side .link-arrow{margin-top:22px}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  transition:border-color .18s,box-shadow .18s;
}
.faq-item:hover{border-color:#D6D3CB}
.faq-item[open]{box-shadow:var(--shadow-1)}
.faq-item summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:20px 24px;
  font-size:16px;
  font-weight:600;
  color:var(--ink-900);
  line-height:1.5;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-plus{
  position:relative;
  width:18px;height:18px;
  flex:0 0 auto;
  transition:transform .22s ease;
}
.faq-plus::before,.faq-plus::after{
  content:"";
  position:absolute;
  top:50%;left:0;
  width:18px;height:2px;
  background:var(--ink-900);
  border-radius:2px;
  transform:translateY(-50%);
}
.faq-plus::after{transform:translateY(-50%) rotate(90deg)}
.faq-item[open] .faq-plus{transform:rotate(45deg)}
.faq-answer{padding:0 24px 22px;font-size:15px;line-height:1.85;color:var(--ink-500)}
.faq-answer a{color:var(--ink-900);text-decoration:underline;text-underline-offset:3px}

/* ---------- 页脚 ---------- */
.site-footer{background:#0E1013;color:var(--ink-300);padding:64px 0 32px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
.site-footer .brand-mark{background:#171A20;border:1px solid #2B2F36}
.site-footer .brand-line1{color:#fff}
.site-footer .brand-line2{color:var(--ink-300)}
.footer-desc{font-size:14px;line-height:1.8;color:#8A9199;margin:16px 0 20px;max-width:280px}
.footer-social{display:flex;gap:12px}
.footer-social a{
  width:36px;height:36px;
  border:1px solid #2B2F36;
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--ink-300);
  transition:color .18s,border-color .18s,transform .18s;
}
.footer-social a:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-2px)}
.footer-col h4{font-size:14px;font-weight:700;color:#fff;margin-bottom:16px;letter-spacing:.02em}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:14px;color:var(--ink-300);display:inline-block;transition:color .18s,transform .18s}
.footer-col a:hover{color:var(--brand);transform:translateX(2px)}
.footer-col .plain{font-size:14px;color:var(--ink-300);line-height:1.7}
.footer-bottom{
  margin-top:48px;
  padding-top:24px;
  border-top:1px solid #2B2F36;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  font-size:13px;
  color:#7A828B;
}
.footer-bottom p{margin:0}
.back-top{
  width:40px;height:40px;
  border-radius:50%;
  border:1px solid var(--brand);
  color:var(--brand);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  transition:background .18s,color .18s,transform .18s;
}
.back-top:hover{background:var(--brand);color:#1A2200;transform:translateY(-2px)}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s cubic-bezier(.22,.61,.36,1),transform .5s cubic-bezier(.22,.61,.36,1)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (min-width:1200px){
  .article-shell{grid-template-columns:minmax(0,720px) 220px;justify-content:center}
  .article-toc{display:block}
}
@media (max-width:1199px){
  .article-shell{max-width:760px}
}
@media (max-width:991px){
  .main-nav{display:none}
  .nav-search{display:none}
  .nav-toggle{display:inline-flex}
  .faq-grid{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:64px 0}
}
@media (max-width:767px){
  .container,.container-lg,.container-md,.container-sm,.container-xl{padding-left:20px;padding-right:20px}
  .nav-inner{height:60px;gap:12px}
  .btn-nav-cta{height:38px;padding:0 16px;font-size:14px}
  .article-hero{padding-top:24px}
  .article-main{padding:24px 0 64px}
  .article-title{font-size:clamp(26px,7vw,34px);max-width:100%}
  .article-body{font-size:16px;line-height:1.85}
  .related-grid{grid-template-columns:1fr}
  .soft-cta{padding:24px}
  .section{padding:48px 0}
  .faq-section{padding:56px 0}
  .footer-grid{grid-template-columns:1fr}
  .footer-desc{max-width:100%}
}
@media (max-width:575px){
  .article-hero{background-image:none}
  .breadcrumb-nav .current{max-width:170px}
  .btn-main,.btn-ghost{width:100%}
  .soft-cta .btn-main,.soft-cta .btn-ghost{width:100%}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:0ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}

/* roulang page: category2 */
:root{
  --ink-900:#101216;
  --ink-700:#2B2F36;
  --ink-500:#5C636D;
  --ink-300:#9AA0A8;
  --line:#E3E1DB;
  --line-strong:#D6D3CB;
  --bg:#F5F4F0;
  --surface:#FFFFFF;
  --surface-hover:#FAFAF6;
  --brand:#C7F24E;
  --brand-soft:#F2FBD9;
  --brand-deep:#7FA61A;
  --brand-ink:#41630A;
  --accent:#FF5C36;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:20px;
  --r-pill:999px;
  --shadow-1:0 1px 2px rgba(16,18,22,.04),0 8px 24px -12px rgba(16,18,22,.10);
  --shadow-2:0 2px 4px rgba(16,18,22,.06),0 20px 40px -20px rgba(16,18,22,.18);
  --font-sans:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-num:Inter,"SF Pro Display",system-ui,-apple-system,sans-serif;
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:88px; --sp-10:112px;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,p,figure,ul,ol{margin:0;padding:0;}
ul,ol{list-style:none;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .18s ease;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input,textarea,select{font:inherit;}
:focus-visible{outline:2px solid var(--brand-deep);outline-offset:2px;border-radius:4px;}
::selection{background:var(--brand);color:#1A2200;}

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

/* ---------- 品牌标识 ---------- */
.brand{display:inline-flex;align-items:center;gap:12px;}
.brand-mark{
  width:40px;height:40px;flex:0 0 40px;
  border-radius:10px;
  background:var(--ink-900);
  display:inline-flex;align-items:center;justify-content:center;
}
.brand-line1{display:block;font-size:16px;font-weight:700;line-height:1.25;color:var(--ink-900);letter-spacing:0;}
.brand-line2{display:block;font-size:11px;font-weight:500;line-height:1.35;letter-spacing:.08em;color:var(--ink-500);}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:var(--shadow-1);
  transition:box-shadow .2s ease;
}
.site-header.is-scrolled{box-shadow:var(--shadow-2);}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  height:72px;
  transition:height .2s ease;
}
.site-header.is-scrolled .header-inner{height:64px;}

.main-nav{display:flex;align-items:center;gap:28px;}
.nav-link{
  position:relative;
  font-size:16px;font-weight:500;color:var(--ink-700);
  padding:6px 0;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--brand);
  transform:scaleX(0);transform-origin:left;
  transition:transform .24s ease;
}
.nav-link:hover{color:var(--ink-900);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.active{color:var(--ink-900);font-weight:700;}
.nav-link.active::after{transform:scaleX(1);}

.header-actions{display:flex;align-items:center;gap:12px;}
.nav-search{position:relative;width:220px;transition:width .24s ease;}
.nav-search:focus-within{width:260px;}
.nav-search input{
  width:100%;height:40px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  background:#F3F2EE;
  padding:0 16px 0 38px;
  font-size:14px;color:var(--ink-900);
  transition:background .2s ease,border-color .2s ease,box-shadow .2s ease;
  -webkit-appearance:none;appearance:none;
}
.nav-search input::placeholder{color:var(--ink-300);}
.nav-search input:focus{
  outline:none;background:#fff;
  border-color:var(--ink-900);
  box-shadow:0 0 0 3px rgba(199,242,78,.35);
}
.nav-search .search-icon{
  position:absolute;left:14px;top:50%;transform:translateY(-50%);
  color:var(--ink-500);pointer-events:none;
}

.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:40px;padding:0 20px;
  border-radius:var(--r-pill);
  background:var(--ink-900);color:#fff;
  font-size:14px;font-weight:600;
  border:1px solid var(--ink-900);
  transition:background .18s ease,color .18s ease,transform .18s ease;
  white-space:nowrap;
}
.nav-cta:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);transform:translateY(-1px);}
.nav-cta:active{transform:translateY(0);}

.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:44px;
  border:1px solid var(--line);
  border-radius:10px;
  background:#fff;
  transition:border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{border-color:var(--ink-900);background:var(--surface-hover);}

/* ---------- 移动端抽屉 ---------- */
.mobile-drawer{display:none;}

/* ---------- 按钮 ---------- */
.btn-ink{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;
  border-radius:10px;
  background:var(--ink-900);color:#fff;
  border:1px solid var(--ink-900);
  font-size:15px;font-weight:600;
  transition:background .18s ease,color .18s ease,transform .18s ease,border-color .18s ease;
}
.btn-ink:hover{background:var(--brand);color:#1A2200;border-color:var(--brand);transform:translateY(-1px);}
.btn-ink:active{transform:translateY(0);}

.btn-outline-ink{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;
  border-radius:10px;
  background:#fff;color:var(--ink-900);
  border:1px solid var(--ink-900);
  font-size:15px;font-weight:600;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.btn-outline-ink:hover{background:var(--ink-900);color:#fff;transform:translateY(-1px);}
.btn-outline-ink:active{transform:translateY(0);}

.text-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:15px;font-weight:600;color:var(--ink-900);
  transition:color .2s ease;
}
.text-link svg{transition:transform .2s ease;}
.text-link:hover{color:var(--brand-deep);}
.text-link:hover svg{transform:translateX(3px);}

/* ---------- 分类横带型首屏 ---------- */
.cat-hero{
  position:relative;
  padding:48px 0 72px;
  background:var(--bg);
  text-align:center;
}
.cat-hero::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(16,18,22,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(16,18,22,.03) 1px,transparent 1px);
  background-size:48px 48px;
  pointer-events:none;
}
.cat-hero .container{position:relative;z-index:1;}

.crumb{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;
  font-size:12px;color:var(--ink-500);
  margin-bottom:20px;
}
.crumb a{color:var(--ink-500);}
.crumb a:hover{color:var(--ink-900);}
.crumb .sep{color:var(--line-strong);}
.crumb .current{color:var(--ink-900);font-weight:500;}

.cat-hero h1{
  font-size:clamp(28px,3.6vw,44px);
  font-weight:800;
  line-height:1.22;
  letter-spacing:-.01em;
  color:var(--ink-900);
  max-width:20em;
  margin:0 auto;
}
.cat-lede{
  margin:18px auto 0;
  max-width:34em;
  font-size:17px;
  line-height:1.75;
  color:var(--ink-500);
}

.chip-bar{
  display:flex;flex-wrap:wrap;justify-content:center;gap:12px;
  margin-top:36px;
}
.chip{
  height:38px;padding:0 18px;
  border-radius:var(--r-pill);
  border:1px solid var(--line-strong);
  background:#fff;
  color:var(--ink-700);
  font-size:14px;font-weight:500;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.chip:hover{border-color:var(--ink-900);color:var(--ink-900);transform:translateY(-1px);}
.chip.is-active{background:var(--ink-900);color:#fff;border-color:var(--ink-900);transform:none;}
.chip:active{transform:translateY(0);}

/* ---------- 通用区块 ---------- */
.section{padding:88px 0;}
.section-alt{
  background:var(--surface);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-head{max-width:660px;margin-bottom:44px;}
.section-head h2{
  font-size:clamp(26px,3.2vw,40px);
  font-weight:700;line-height:1.2;letter-spacing:-.01em;
  color:var(--ink-900);
}
.section-sub{
  margin-top:14px;
  font-size:17px;line-height:1.75;
  color:var(--ink-500);
}

/* ---------- 编号横条目 ---------- */
.band-list{border-bottom:1px solid var(--line);}
.band-row{
  display:grid;
  grid-template-columns:64px minmax(0,1fr);
  gap:28px;
  align-items:start;
  padding:34px 0;
  border-top:1px solid var(--line);
  transition:transform .2s ease;
}
.band-row:hover{transform:translateX(4px);}
.band-num{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:14px;font-weight:700;
  letter-spacing:.06em;
  color:var(--brand-deep);
  padding-top:9px;
}
.band-body h3{
  font-size:21px;font-weight:600;line-height:1.35;
  color:var(--ink-900);
}
.band-body p{
  margin-top:10px;
  font-size:15px;line-height:1.85;
  color:var(--ink-500);
  max-width:64em;
}
.band-body .text-link{margin-top:16px;}

/* ---------- 卡片网格 ---------- */
.card-grid-2{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:24px;
}
.content-card{
  display:flex;flex-direction:column;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  box-shadow:var(--shadow-1);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.content-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-2);
  border-color:var(--line-strong);
}
.card-media{
  aspect-ratio:16/10;
  overflow:hidden;
  background:#EFEEE9;
}
.card-media img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .35s ease;
}
.content-card:hover .card-media img{transform:scale(1.03);}
.card-body{
  padding:24px;
  display:flex;flex-direction:column;gap:10px;
  flex:1;
}
.badge-soft{
  display:inline-flex;align-items:center;
  height:26px;padding:0 12px;
  border-radius:var(--r-pill);
  background:var(--brand-soft);
  color:var(--brand-ink);
  font-size:13px;font-weight:600;
  width:fit-content;
}
.card-body h3{
  font-size:20px;font-weight:600;line-height:1.35;
  color:var(--ink-900);
}
.card-body p{
  font-size:15px;line-height:1.8;
  color:var(--ink-500);
}
.card-meta{
  margin-top:auto;padding-top:14px;
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;font-weight:600;color:var(--ink-900);
}
.card-meta svg{transition:transform .2s ease;}
.content-card:hover .card-meta svg{transform:translateX(3px);}

/* ---------- FAQ ---------- */
.faq-wrap{
  display:grid;
  grid-template-columns:4fr 8fr;
  gap:48px;
  align-items:start;
}
.faq-side h2{
  font-size:clamp(26px,3.2vw,40px);
  font-weight:700;line-height:1.2;letter-spacing:-.01em;
  color:var(--ink-900);
}
.faq-side p{
  margin-top:14px;
  font-size:16px;line-height:1.8;
  color:var(--ink-500);
}
.faq-side .text-link{margin-top:20px;}

.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  margin-bottom:12px;
  overflow:hidden;
  transition:border-color .2s ease,box-shadow .2s ease;
}
.faq-item:hover{border-color:var(--line-strong);}
.faq-item.open{border-color:var(--line-strong);box-shadow:var(--shadow-1);}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;
  padding:20px 24px;
  text-align:left;
  font-size:16px;font-weight:600;line-height:1.5;
  color:var(--ink-900);
}
.faq-icon{
  position:relative;flex:0 0 16px;
  width:16px;height:16px;
  transition:transform .22s ease;
}
.faq-icon::before,
.faq-icon::after{
  content:"";position:absolute;
  background:var(--ink-900);
  border-radius:2px;
  transition:opacity .22s ease,transform .22s ease;
}
.faq-icon::before{left:0;right:0;top:7px;height:2px;}
.faq-icon::after{top:0;bottom:0;left:7px;width:2px;}
.faq-item.open .faq-icon::after{transform:rotate(90deg);opacity:0;}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .24s ease;
}
.faq-item.open .faq-a{max-height:340px;}
.faq-a p{
  padding:0 24px 22px;
  font-size:15px;line-height:1.85;
  color:var(--ink-500);
}

/* ---------- CTA 带 ---------- */
.cta-band{
  background:var(--brand-soft);
  padding:64px 0;
  scroll-margin-top:90px;
}
.cta-band-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:32px;flex-wrap:wrap;
}
.cta-band h2{
  font-size:clamp(24px,2.6vw,32px);
  font-weight:700;line-height:1.28;
  color:var(--ink-900);
}
.cta-band p{
  margin-top:10px;
  font-size:16px;line-height:1.75;
  color:var(--ink-500);
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:#0E1013;
  color:var(--ink-300);
  padding:64px 0 32px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1fr;
  gap:40px;
}
.site-footer .brand-mark{background:#1B1E24;}
.site-footer .brand-line1{color:#fff;}
.site-footer .brand-line2{color:var(--ink-300);}
.footer-desc{
  margin-top:18px;
  max-width:32em;
  font-size:14px;line-height:1.8;
  color:var(--ink-300);
}
.footer-social{display:flex;gap:12px;margin-top:20px;}
.footer-social a{
  width:36px;height:36px;
  border:1px solid #2B2F36;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  color:var(--ink-300);
  transition:color .2s ease,border-color .2s ease,transform .2s ease;
}
.footer-social a:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-2px);}

.footer-col h4{
  font-size:14px;font-weight:600;color:#fff;
  letter-spacing:.02em;margin-bottom:18px;
}
.footer-col ul li{margin-bottom:12px;}
.footer-col ul a{
  display:inline-block;
  font-size:14px;color:var(--ink-300);
  transition:color .2s ease,transform .2s ease;
}
.footer-col ul a:hover{color:var(--brand);transform:translateX(2px);}

.footer-bottom{
  margin-top:48px;padding-top:24px;
  border-top:1px solid #2B2F36;
  display:flex;align-items:center;justify-content:space-between;
  gap:20px;flex-wrap:wrap;
  font-size:13px;color:var(--ink-300);
}
.footer-bottom p{margin:0;}
.to-top{
  width:40px;height:40px;flex:0 0 40px;
  border-radius:50%;
  border:1px solid var(--brand);
  color:var(--brand);
  display:inline-flex;align-items:center;justify-content:center;
  transition:background .2s ease,color .2s ease,transform .2s ease;
}
.to-top:hover{background:var(--brand);color:#1A2200;transform:translateY(-2px);}

/* ---------- 进场动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s cubic-bezier(.22,.61,.36,1),transform .5s cubic-bezier(.22,.61,.36,1);
}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .main-nav{gap:22px;}
  .nav-search{width:190px;}
  .nav-search:focus-within{width:220px;}
}

@media (max-width:991px){
  .main-nav,.nav-search{display:none;}
  .nav-toggle{display:inline-flex;}
  .section{padding:64px 0;}
  .faq-wrap{grid-template-columns:1fr;gap:32px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .mobile-drawer{
    display:flex;
    position:fixed;inset:0;z-index:1100;
    background:#fff;
    flex-direction:column;
    padding:20px 20px 24px;
    opacity:0;visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .22s ease,transform .22s ease,visibility .22s;
  }
  .mobile-drawer.open{opacity:1;visibility:visible;transform:translateY(0);}
  .drawer-top{display:flex;align-items:center;justify-content:space-between;gap:16px;}
  .drawer-close{
    width:44px;height:44px;
    border:1px solid var(--line);border-radius:10px;
    display:inline-flex;align-items:center;justify-content:center;
    font-size:18px;color:var(--ink-900);
    transition:border-color .2s ease,background .2s ease;
  }
  .drawer-close:hover{border-color:var(--ink-900);background:var(--surface-hover);}
  .drawer-nav{display:flex;flex-direction:column;margin-top:28px;flex:1;overflow-y:auto;}
  .drawer-nav a{
    font-size:20px;font-weight:600;line-height:56px;
    color:var(--ink-900);
    border-bottom:1px solid var(--line);
  }
  .drawer-nav a.active{color:var(--brand-deep);}
  .drawer-bottom{padding-top:20px;}
  .drawer-bottom .btn-ink{width:100%;}
}

@media (max-width:767px){
  .container{padding-left:20px;padding-right:20px;}
  .section{padding:48px 0;}
  .cat-hero{padding:28px 0 44px;}
  .cat-lede{font-size:16px;}
  .band-row{grid-template-columns:1fr;gap:10px;padding:28px 0;}
  .band-num{padding-top:0;}
  .band-body h3{font-size:19px;}
  .card-grid-2{grid-template-columns:1fr;}
  .cta-band{padding:48px 0;}
  .cta-band-inner{flex-direction:column;align-items:flex-start;gap:24px;}
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}

@media (max-width:575px){
  .chip-bar{gap:8px;}
  .chip{height:34px;padding:0 14px;font-size:13px;}
  .btn-ink,.btn-outline-ink{width:100%;}
  .nav-cta{padding:0 16px;font-size:13px;}
  .cat-hero::before{display:none;}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none;}
}

.reveal{opacity:1 !important;transform:none !important;}