/* roulang page: index */
:root{
  --brand-700:#17456E;
  --brand-600:#215F9A;
  --brand-500:#2E77B8;
  --brand-50:#EDF4FB;
  --accent-teal:#17998F;
  --accent-amber:#F08A24;
  --ink-900:#12263F;
  --ink-700:#2E3E4E;
  --ink-500:#61788C;
  --line:#E3EBF3;
  --bg-page:#F6F9FC;
  --bg-card:#FFFFFF;
  --radius-card:14px;
  --radius-img:10px;
  --radius-btn:10px;
  --shadow-card:0 8px 24px rgba(18,38,63,.06);
  --shadow-hover:0 14px 34px rgba(18,38,63,.10);
  --shadow-btn:0 6px 16px rgba(33,95,154,.24);
  --focus-ring:0 0 0 3px rgba(33,95,154,.28);
  --gap-section:88px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--bg-page);
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0;}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--brand-700);}
p{margin:0 0 16px;}
h1,h2,h3,h4,h5{margin:0;color:var(--ink-900);font-weight:700;letter-spacing:.01em;line-height:1.3;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;font-size:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input{font-family:inherit;}
:focus-visible{outline:none;box-shadow:var(--focus-ring);border-radius:6px;}
::selection{background:var(--brand-50);color:var(--brand-700);}

.ld-container{max-width:1200px;margin:0 auto;padding:0 32px;width:100%;}
.ld-section{padding:var(--gap-section) 0;}
.ld-section--tight{padding:64px 0;}
.ld-section--plain{background:var(--bg-card);}

/* ---------- 顶部导航 ---------- */
.ld-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.ld-header-inner{
  height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.ld-logo{display:inline-flex;align-items:center;gap:10px;color:var(--ink-900);font-weight:700;font-size:18px;letter-spacing:.02em;}
.ld-logo:hover{color:var(--brand-600);}
.ld-logo-mark{width:30px;height:30px;flex:0 0 30px;color:var(--brand-600);}
.ld-logo-text small{font-size:12px;font-weight:500;color:var(--ink-500);margin-left:4px;letter-spacing:.08em;}
.ld-nav{display:flex;align-items:center;gap:6px;}
.ld-nav-link{
  position:relative;display:inline-block;padding:8px 14px;font-size:15px;color:var(--ink-700);border-radius:8px;
  transition:color .2s ease,background .2s ease;
}
.ld-nav-link:hover{color:var(--brand-600);background:var(--brand-50);}
.ld-nav-link.is-active{color:var(--brand-600);font-weight:600;}
.ld-nav-link.is-active::after{
  content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;
  width:16px;height:2px;background:var(--brand-600);border-radius:2px;
}
.ld-nav-actions{display:flex;align-items:center;gap:12px;}
.ld-icon-btn{
  width:40px;height:40px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;
  color:var(--ink-700);border:1px solid transparent;transition:all .2s ease;
}
.ld-icon-btn:hover{background:var(--brand-50);color:var(--brand-600);border-color:var(--line);}
.ld-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;
  transition:all .22s ease;border:1.5px solid transparent;white-space:nowrap;
}
.ld-btn-primary{background:var(--brand-600);color:#fff;}
.ld-btn-primary:hover{background:var(--brand-700);color:#fff;box-shadow:var(--shadow-btn);transform:translateY(-1px);}
.ld-btn-ghost{background:transparent;color:var(--brand-600);border-color:var(--brand-600);}
.ld-btn-ghost:hover{background:var(--brand-50);color:var(--brand-700);border-color:var(--brand-700);}
.ld-btn-sm{padding:9px 18px;font-size:14px;}
.ld-btn-link{padding:0;color:var(--brand-600);font-weight:600;font-size:15px;border-bottom:2px solid transparent;border-radius:0;}
.ld-btn-link:hover{border-bottom-color:var(--brand-600);color:var(--brand-700);}
.ld-burger{display:none;width:40px;height:40px;border-radius:10px;align-items:center;justify-content:center;color:var(--ink-900);}
.ld-burger:hover{background:var(--brand-50);}
.ld-search-panel{
  max-height:0;overflow:hidden;transition:max-height .28s ease;background:#fff;border-top:1px solid transparent;
}
.ld-search-panel.is-open{max-height:120px;border-top-color:var(--line);}
.ld-search-inner{display:flex;gap:12px;padding:14px 0;}
.ld-search-input{
  flex:1;height:44px;border-radius:10px;border:1.5px solid var(--line);padding:0 16px;font-size:15px;color:var(--ink-900);background:var(--bg-page);
}
.ld-search-input:focus{outline:none;border-color:var(--brand-500);box-shadow:var(--focus-ring);background:#fff;}
.ld-drawer{
  display:none;position:fixed;inset:56px 0 0 0;background:#fff;z-index:70;padding:20px 20px 32px;overflow-y:auto;
}
.ld-drawer.is-open{display:flex;flex-direction:column;}
.ld-drawer a.ld-drawer-link{
  display:flex;align-items:center;justify-content:space-between;padding:16px 4px;font-size:17px;color:var(--ink-900);
  border-bottom:1px solid var(--line);
}
.ld-drawer a.ld-drawer-link.is-active{color:var(--brand-600);font-weight:600;}
.ld-drawer .ld-btn{margin-top:24px;width:100%;}

/* ---------- Hero ---------- */
.ld-hero{padding:56px 0 88px;background:linear-gradient(180deg,#F2F7FC 0%,var(--bg-page) 62%);}
.ld-kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--brand-600);font-weight:600;letter-spacing:.06em;margin-bottom:18px;}
.ld-kicker::before{content:"";width:10px;height:10px;background:var(--brand-600);border-radius:3px;display:inline-block;}
.ld-hero-title{font-size:46px;line-height:1.15;margin-bottom:20px;color:var(--ink-900);}
.ld-hero-sub{font-size:16px;line-height:1.85;color:var(--ink-700);margin-bottom:8px;max-width:520px;}
.ld-hero-sub span{display:block;}
.ld-hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin:28px 0 36px;}
.ld-stats{display:flex;flex-wrap:wrap;gap:40px;padding-top:24px;border-top:1px solid var(--line);}
.ld-stat-num{font-size:26px;font-weight:700;color:var(--accent-amber);line-height:1.2;}
.ld-stat-label{font-size:13px;color:var(--ink-500);margin-top:4px;}
.ld-hero-visual{position:relative;}
.ld-hero-img{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:18px;background:#E8EFF7;
  box-shadow:0 18px 40px rgba(18,38,63,.10);
}
.ld-hero-card{
  position:absolute;right:18px;bottom:18px;width:250px;background:#fff;border-radius:var(--radius-card);
  padding:16px 18px;box-shadow:0 12px 30px rgba(18,38,63,.16);border:1px solid var(--line);
}
.ld-hero-card h3{font-size:16px;margin:10px 0 6px;}
.ld-hero-card p{font-size:13px;line-height:1.7;color:var(--ink-500);margin:0 0 10px;}
.ld-mini-link{font-size:13px;font-weight:600;color:var(--brand-600);}
.ld-mini-link:hover{color:var(--brand-700);}

/* ---------- 通用板块头 ---------- */
.ld-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap;}
.ld-section-title{font-size:32px;line-height:1.25;}
.ld-section-title i{color:var(--accent-teal);font-size:22px;margin-right:10px;vertical-align:2px;}
.ld-section-desc{font-size:14px;color:var(--ink-500);margin-top:10px;max-width:640px;line-height:1.75;}
.ld-badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  font-size:12.5px;font-weight:600;background:var(--brand-50);color:var(--brand-600);letter-spacing:.02em;
}
.ld-badge-teal{background:transparent;color:var(--accent-teal);border:1px solid rgba(23,153,143,.45);}
.ld-badge-amber{background:rgba(240,138,36,.12);color:#B9650E;}

/* ---------- 主题封面 ---------- */
.ld-cover-main{
  position:relative;border-radius:var(--radius-card);overflow:hidden;background:#E8EFF7;
  box-shadow:var(--shadow-card);transition:all .26s ease;display:block;
}
.ld-cover-main:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.ld-cover-main img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.ld-cover-main .ld-cover-meta{
  position:absolute;left:16px;bottom:16px;right:16px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.ld-cover-main .ld-cover-meta .ld-badge{background:rgba(255,255,255,.94);color:var(--brand-700);}
.ld-cover-main .ld-cover-meta em{font-style:normal;font-size:12.5px;color:#fff;background:rgba(23,69,110,.82);padding:2px 10px;border-radius:999px;}
.ld-side-list{display:flex;flex-direction:column;gap:16px;}
.ld-side-item{
  display:flex;gap:16px;align-items:center;background:var(--bg-card);border:1px solid var(--line);
  border-radius:var(--radius-card);padding:14px;box-shadow:var(--shadow-card);transition:all .24s ease;
}
.ld-side-item:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:#D5E4F2;}
.ld-side-item img{width:120px;height:90px;flex:0 0 120px;object-fit:cover;border-radius:var(--radius-img);background:#E8EFF7;}
.ld-side-body{min-width:0;flex:1;}
.ld-side-body h3{font-size:17px;line-height:1.5;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.ld-side-body p{font-size:13px;color:var(--ink-500);margin:0;}
.ld-side-arrow{color:var(--brand-500);font-size:14px;transition:transform .22s ease;flex:0 0 auto;}
.ld-side-item:hover .ld-side-arrow{transform:translateX(4px);}

/* ---------- 合集目录 ---------- */
.ld-catalog{display:grid;grid-template-columns:3fr 9fr;gap:40px;align-items:start;}
.ld-filters{position:sticky;top:96px;display:flex;flex-direction:column;gap:6px;}
.ld-filter-link{
  position:relative;display:block;padding:11px 14px 11px 18px;font-size:15px;color:var(--ink-700);border-radius:8px;
  transition:all .2s ease;
}
.ld-filter-link:hover{background:var(--brand-50);color:var(--brand-600);}
.ld-filter-link.is-current{color:var(--brand-700);font-weight:600;background:var(--brand-50);}
.ld-filter-link.is-current::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--accent-teal);
}
.ld-cat-list{border-top:1px dashed var(--line);}
.ld-cat-row{
  display:flex;align-items:center;gap:20px;padding:22px 16px;border-bottom:1px dashed var(--line);
  transition:background .2s ease;border-radius:8px;
}
.ld-cat-row:hover{background:var(--brand-50);}
.ld-cat-row:hover .ld-side-arrow{transform:translateX(4px);}
.ld-cat-num{width:40px;flex:0 0 40px;font-size:15px;font-weight:700;color:var(--ink-500);}
.ld-cat-body{flex:1;min-width:0;}
.ld-cat-body h3{font-size:18px;margin-bottom:4px;}
.ld-cat-body p{font-size:13.5px;color:var(--ink-500);margin:0;}
.ld-cat-count{font-size:13px;color:var(--ink-500);white-space:nowrap;}

/* ---------- 精选条目 ---------- */
.ld-picks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.ld-pick-card{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;
  box-shadow:var(--shadow-card);transition:all .26s ease;display:flex;flex-direction:column;
}
.ld-pick-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.ld-pick-card img{width:100%;aspect-ratio:16/9;object-fit:cover;background:#E8EFF7;}
.ld-pick-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1;}
.ld-pick-body h3{font-size:19px;line-height:1.45;margin:10px 0 10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.ld-pick-body p{font-size:14px;line-height:1.75;color:var(--ink-500);margin:0 0 16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.ld-pick-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-500);}
.ld-pick-foot .ld-fav{color:var(--ink-500);transition:color .2s ease;}
.ld-pick-foot .ld-fav:hover{color:var(--accent-amber);}
.ld-pick-wide{
  grid-column:1 / -1;display:grid;grid-template-columns:5fr 7fr;gap:0;
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;
  box-shadow:var(--shadow-card);transition:all .26s ease;
}
.ld-pick-wide:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.ld-pick-wide img{width:100%;height:100%;min-height:230px;object-fit:cover;background:#E8EFF7;}
.ld-pick-wide .ld-pick-body{justify-content:center;padding:28px 30px;}
.ld-pick-wide h3{font-size:22px;}

/* ---------- 最新动态 CMS ---------- */
.ld-news{border-top:1px solid var(--line);}
.ld-news-row{
  display:flex;align-items:center;gap:20px;min-height:76px;padding:16px 16px;border-bottom:1px solid var(--line);
  border-radius:8px;transition:background .2s ease;
}
.ld-news-row:hover{background:var(--brand-50);}
.ld-news-row:hover .ld-side-arrow{transform:translateX(4px);}
.ld-news-cat{flex:0 0 auto;}
.ld-news-main{flex:1;min-width:0;}
.ld-news-title{display:block;font-size:16.5px;font-weight:600;color:var(--ink-900);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.ld-news-desc{display:block;font-size:13.5px;color:var(--ink-500);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px;}
.ld-news-time{font-size:13px;color:var(--ink-500);white-space:nowrap;flex:0 0 auto;}
.ld-news-arrow{color:var(--brand-500);flex:0 0 auto;transition:transform .2s ease;}
.ld-empty{
  min-height:160px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  background:var(--bg-card);border:1px dashed var(--line);border-radius:var(--radius-card);text-align:center;padding:24px;
}
.ld-empty i{font-size:44px;color:#B9CBDB;}
.ld-empty strong{font-size:15px;color:var(--ink-700);font-weight:600;}
.ld-empty span{font-size:13px;color:var(--ink-500);}

/* ---------- 横向推荐轨道 ---------- */
.ld-rail-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px;flex-wrap:wrap;}
.ld-rail-nav{display:flex;gap:10px;}
.ld-rail-btn{
  width:40px;height:40px;border-radius:999px;border:1.5px solid var(--line);background:#fff;color:var(--brand-600);
  display:inline-flex;align-items:center;justify-content:center;transition:all .2s ease;
}
.ld-rail-btn:hover{background:var(--brand-50);border-color:var(--brand-500);}
.ld-rail{display:flex;gap:20px;overflow-x:auto;scroll-behavior:smooth;padding-bottom:8px;scrollbar-width:none;}
.ld-rail::-webkit-scrollbar{display:none;}
.ld-rail-card{
  flex:0 0 280px;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-card);transition:all .24s ease;
}
.ld-rail-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.ld-rail-card img{width:100%;aspect-ratio:4/3;object-fit:cover;background:#E8EFF7;}
.ld-rail-card .ld-rail-body{padding:16px 18px 18px;}
.ld-rail-card h3{font-size:16px;line-height:1.5;margin:8px 0 6px;}
.ld-rail-card p{font-size:13px;color:var(--ink-500);margin:0;}

/* ---------- CTA 带 ---------- */
.ld-cta-band{background:var(--brand-50);padding:48px 0;}
.ld-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;}
.ld-cta-inner h2{font-size:26px;margin-bottom:8px;}
.ld-cta-inner p{font-size:14.5px;color:var(--ink-500);margin:0;}
.ld-cta-actions{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- FAQ ---------- */
.ld-faq{max-width:860px;margin:0 auto;}
.ld-faq-item{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);margin-bottom:14px;overflow:hidden;transition:box-shadow .22s ease;}
.ld-faq-item.is-open{box-shadow:var(--shadow-card);border-color:#D5E4F2;}
.ld-faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;
  padding:20px 22px;font-size:17px;font-weight:700;color:var(--ink-900);
}
.ld-faq-q:hover{color:var(--brand-600);}
.ld-faq-q i{color:var(--brand-500);transition:transform .26s ease;font-size:14px;}
.ld-faq-item.is-open .ld-faq-q i{transform:rotate(45deg);}
.ld-faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.ld-faq-a p{padding:0 22px 20px;margin:0;font-size:15px;line-height:1.8;color:var(--ink-700);}

/* ---------- 页脚 ---------- */
.ld-footer{background:var(--brand-700);color:rgba(255,255,255,.88);padding:64px 0 24px;margin-top:0;}
.ld-footer a{color:rgba(255,255,255,.88);}
.ld-footer a:hover{color:#fff;text-decoration:underline;}
.ld-footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;}
.ld-footer .ld-logo{color:#fff;}
.ld-footer .ld-logo:hover{color:#fff;}
.ld-footer .ld-logo-mark{color:#8FC4EE;}
.ld-footer .ld-logo-text small{color:rgba(255,255,255,.6);}
.ld-footer-about{font-size:13.5px;line-height:1.9;color:rgba(255,255,255,.72);margin-top:16px;max-width:320px;}
.ld-footer h4{font-size:15px;color:#fff;margin-bottom:16px;letter-spacing:.04em;}
.ld-footer-list li{margin-bottom:10px;font-size:14px;}
.ld-footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.16);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.62);
}
.ld-footer-bottom span{color:rgba(255,255,255,.62);}

/* ---------- 响应式 ---------- */
@media screen and (max-width:1023px){
  :root{--gap-section:64px;}
  .ld-container{padding:0 24px;}
  .ld-hero{padding:40px 0 64px;}
  .ld-hero-title{font-size:36px;}
  .ld-hero-visual{margin-top:36px;}
  .ld-catalog{grid-template-columns:1fr;gap:28px;}
  .ld-filters{position:static;flex-direction:row;flex-wrap:wrap;gap:8px;}
  .ld-filter-link{padding:8px 14px;background:#fff;border:1px solid var(--line);font-size:14px;}
  .ld-filter-link.is-current::before{display:none;}
  .ld-footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .ld-pick-wide{grid-template-columns:1fr;}
  .ld-pick-wide img{min-height:200px;aspect-ratio:16/9;}
  .ld-nav,.ld-nav-actions .ld-btn{display:none;}
  .ld-burger{display:inline-flex;}
  .ld-section-title{font-size:26px;}
  .ld-stats{gap:28px;}
}
@media screen and (max-width:639px){
  :root{--gap-section:48px;}
  .ld-container{padding:0 16px;}
  .ld-header-inner{height:56px;}
  .ld-hero{padding:32px 0 48px;}
  .ld-hero-title{font-size:30px;}
  .ld-hero-sub{font-size:15.5px;}
  .ld-hero-actions .ld-btn{width:100%;}
  .ld-hero-img{aspect-ratio:auto;height:260px;}
  .ld-hero-card{position:static;width:100%;margin-top:14px;box-shadow:var(--shadow-card);}
  .ld-stats{gap:20px;justify-content:space-between;}
  .ld-stat-num{font-size:22px;}
  .ld-section-title{font-size:24px;}
  .ld-picks{grid-template-columns:1fr;}
  .ld-pick-wide{grid-column:auto;}
  .ld-side-item img{width:96px;height:76px;flex:0 0 96px;}
  .ld-cat-row{gap:14px;padding:18px 10px;flex-wrap:wrap;}
  .ld-cat-num{width:28px;flex:0 0 28px;}
  .ld-news-row{gap:12px;padding:14px 8px;flex-wrap:wrap;}
  .ld-news-main{flex:1 1 100%;order:2;}
  .ld-news-time{order:3;margin-left:auto;}
  .ld-news-arrow{display:none;}
  .ld-news-title{font-size:15.5px;white-space:normal;}
  .ld-news-desc{white-space:normal;}
  .ld-cta-inner h2{font-size:22px;}
  .ld-cta-actions .ld-btn{width:100%;}
  .ld-footer-grid{grid-template-columns:1fr;gap:28px;}
  .ld-footer{padding:48px 0 20px;}
  .ld-faq-q{font-size:16px;padding:18px;}
  .ld-faq-a p{padding:0 18px 18px;font-size:14.5px;}
  .ld-rail-card{flex:0 0 240px;}
}

/* roulang page: article */
:root{
  --brand-700:#17456E;
  --brand-600:#215F9A;
  --brand-500:#2E77B8;
  --brand-50:#EDF4FB;
  --teal:#17998F;
  --amber:#F08A24;
  --ink-900:#12263F;
  --ink-700:#2E3E4E;
  --ink-500:#61788C;
  --line:#E3EBF3;
  --bg:#F6F9FC;
  --card:#FFFFFF;
  --radius-card:14px;
  --radius-img:10px;
  --radius-btn:10px;
  --shadow-card:0 8px 24px rgba(18,38,63,.06);
  --shadow-hover:0 14px 34px rgba(18,38,63,.10);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-700);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
h1,h2,h3,h4,h5,h6{margin:0;color:var(--ink-900);font-weight:700;letter-spacing:.01em;line-height:1.3;}
p{margin:0;}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--brand-700);}
img{max-width:100%;display:block;height:auto;}
svg{display:block;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
input{font:inherit;}
::selection{background:rgba(46,119,184,.18);}

.ld-container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
.ld-section{padding:64px 0 0;}
.ld-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:26px;}
.ld-section-title{font-size:28px;line-height:1.25;display:flex;align-items:center;gap:12px;}
.ld-section-title::before{content:"";width:4px;height:22px;border-radius:2px;background:var(--teal);}
.ld-section-sub{font-size:14px;color:var(--ink-500);margin-top:6px;}
.ld-text-link{font-size:14px;font-weight:600;color:var(--brand-600);display:inline-flex;align-items:center;gap:6px;}
.ld-text-link:hover{color:var(--brand-700);}

/* ---------- 按钮 ---------- */
.ld-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1.4;
  border:1.5px solid transparent;
  transition:background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease;
  white-space:nowrap;
}
.ld-btn:focus-visible{outline:3px solid rgba(33,95,154,.28);outline-offset:2px;}
.ld-btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 4px 12px rgba(33,95,154,.18);}
.ld-btn-primary:hover{background:var(--brand-700);color:#fff;box-shadow:0 6px 16px rgba(33,95,154,.24);transform:translateY(-1px);}
.ld-btn-ghost{background:transparent;border-color:var(--brand-600);color:var(--brand-600);}
.ld-btn-ghost:hover{background:var(--brand-50);color:var(--brand-700);border-color:var(--brand-700);}
.ld-btn-sm{padding:9px 18px;font-size:14px;}
.ld-btn-block{width:100%;}
.ld-btn[disabled]{opacity:.45;cursor:not-allowed;}

.ld-icon-btn{
  width:40px;height:40px;border-radius:10px;border:1px solid var(--line);
  background:#fff;color:var(--ink-700);
  display:inline-flex;align-items:center;justify-content:center;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.ld-icon-btn:hover{background:var(--brand-50);color:var(--brand-600);border-color:var(--brand-600);}
.ld-icon-btn:focus-visible{outline:3px solid rgba(33,95,154,.28);outline-offset:2px;}
.ld-icon-btn svg{width:18px;height:18px;}

/* ---------- 顶部导航 ---------- */
.ld-header{position:sticky;top:0;z-index:80;background:#fff;border-bottom:1px solid var(--line);}
.ld-header-inner{display:flex;align-items:center;gap:26px;height:64px;}
.ld-logo{display:inline-flex;align-items:center;gap:10px;color:var(--brand-700);font-size:19px;font-weight:800;letter-spacing:.01em;flex:0 0 auto;}
.ld-logo:hover{color:var(--brand-600);}
.ld-logo-mark{width:30px;height:30px;color:var(--brand-600);flex:0 0 30px;}
.ld-logo-text{display:inline-flex;align-items:baseline;gap:4px;white-space:nowrap;}
.ld-logo-text small{font-size:11px;font-weight:600;color:var(--ink-500);letter-spacing:.08em;}
.ld-nav{display:flex;align-items:center;gap:4px;}
.ld-nav-link{
  position:relative;display:inline-block;
  padding:8px 12px;border-radius:8px;
  font-size:15px;color:var(--ink-700);font-weight:500;
  transition:color .2s ease,background .2s ease;
}
.ld-nav-link:hover{color:var(--brand-600);background:var(--brand-50);}
.ld-nav-link.is-active{color:var(--brand-600);font-weight:700;}
.ld-nav-link.is-active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:0;
  height:2px;border-radius:2px;background:var(--brand-600);
}
.ld-header-actions{margin-left:auto;display:flex;align-items:center;gap:10px;}
.ld-menu-btn{display:none;}

.ld-search{display:none;border-top:1px solid var(--line);background:#fff;}
.ld-search.is-open{display:block;}
.ld-search-field{display:flex;gap:10px;padding:14px 0;}
.ld-search-field input{
  flex:1;height:44px;padding:0 16px;border-radius:10px;
  border:1px solid var(--line);background:#fff;color:var(--ink-900);
  font-size:15px;
}
.ld-search-field input::placeholder{color:#9AAFC2;}
.ld-search-field input:focus{outline:none;border-color:var(--brand-500);box-shadow:0 0 0 3px rgba(33,95,154,.18);}

.ld-drawer{
  position:fixed;left:0;right:0;top:64px;bottom:0;z-index:90;
  background:#fff;padding:20px 24px 32px;overflow-y:auto;
  display:none;flex-direction:column;gap:4px;
}
.ld-drawer.is-open{display:flex;}
.ld-drawer-link{
  display:block;padding:15px 4px;font-size:17px;font-weight:600;
  color:var(--ink-900);border-bottom:1px solid var(--line);
}
.ld-drawer-link:hover{color:var(--brand-600);}
.ld-drawer-cta{margin-top:22px;}

/* ---------- 面包屑 ---------- */
.ld-crumbs-wrap{padding:22px 0 0;}
.ld-crumbs{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--ink-500);}
.ld-crumbs a{color:var(--ink-500);}
.ld-crumbs a:hover{color:var(--brand-600);}
.ld-crumb-sep{color:#BFD2E2;}
.ld-crumb-current{color:var(--ink-500);max-width:420px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ---------- 文章头部 ---------- */
.ld-post-head{padding:22px 0 0;}
.ld-post-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;padding-bottom:24px;border-bottom:1px solid var(--line);}
.ld-post-head-main{max-width:820px;min-width:0;}
.ld-badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  font-size:12.5px;font-weight:600;line-height:1;background:var(--brand-50);color:var(--brand-600);
}
.ld-badge-teal{background:transparent;border:1px solid var(--teal);color:var(--teal);}
.ld-badge-amber{background:#FDF0E1;color:#BE6A15;}
.ld-post-title{
  font-size:clamp(28px,3.2vw,42px);
  line-height:1.24;margin:14px 0 16px;
  color:var(--ink-900);letter-spacing:.01em;
  word-break:break-word;
}
.ld-post-meta{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--ink-500);}
.ld-meta-dot{width:3px;height:3px;border-radius:50%;background:#C3D3E0;}
.ld-post-tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.ld-fav-btn.is-active{background:#FDF0E1;border-color:var(--amber);color:#BE6A15;}
.ld-fav-btn.is-active svg{fill:var(--amber);stroke:var(--amber);}

/* ---------- 文章主体布局 ---------- */
.ld-main{padding:36px 0 0;}
.ld-article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;align-items:start;padding-bottom:16px;}

.ld-article-body{
  max-width:760px;font-size:17px;line-height:1.9;color:var(--ink-700);
  word-break:break-word;overflow-wrap:anywhere;
}
.ld-article-body > * + *{margin-top:20px;}
.ld-article-body p{margin:0;}
.ld-article-body h2{
  position:relative;font-size:26px;line-height:1.36;color:var(--ink-900);
  margin:40px 0 0;padding-left:15px;scroll-margin-top:88px;
}
.ld-article-body h2::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:var(--teal);
}
.ld-article-body h3{font-size:20px;line-height:1.4;color:var(--ink-900);margin:28px 0 0;scroll-margin-top:88px;}
.ld-article-body h4{font-size:17px;color:var(--ink-900);margin:22px 0 0;}
.ld-article-body ul{padding-left:20px;}
.ld-article-body ul li{position:relative;padding-left:6px;}
.ld-article-body ul li + li{margin-top:8px;}
.ld-article-body ul li::before{
  content:"";position:absolute;left:-14px;top:.72em;width:6px;height:6px;border-radius:2px;background:var(--teal);
}
.ld-article-body ol{list-style:decimal;padding-left:24px;}
.ld-article-body ol li + li{margin-top:8px;}
.ld-article-body ol li::marker{color:var(--brand-600);font-weight:700;}
.ld-article-body blockquote{
  margin:24px 0;padding:16px 20px;background:var(--brand-50);
  border-left:3px solid var(--brand-500);border-radius:0 10px 10px 0;color:var(--ink-700);
}
.ld-article-body blockquote p{margin:0;}
.ld-article-body img{border-radius:var(--radius-img);margin:24px 0;background:#E8EFF7;}
.ld-article-body figure{margin:24px 0;}
.ld-article-body figure img{margin:0;}
.ld-article-body figcaption{font-size:13px;color:var(--ink-500);text-align:center;margin-top:10px;}
.ld-article-body a{color:var(--brand-600);border-bottom:1px solid rgba(33,95,154,.35);}
.ld-article-body a:hover{color:var(--brand-700);border-bottom-color:var(--brand-700);}
.ld-article-body table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.7;margin:24px 0;}
.ld-article-body th{background:var(--brand-50);color:var(--ink-900);font-weight:700;text-align:left;}
.ld-article-body th,.ld-article-body td{padding:10px 14px;border-bottom:1px solid var(--line);}
.ld-article-body code{background:#EEF3F8;color:#1B4B78;padding:2px 6px;border-radius:6px;font-size:.92em;}
.ld-article-body hr{border:0;border-top:1px solid var(--line);margin:32px 0;}

.ld-empty{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;min-height:220px;padding:48px 24px;text-align:center;
  background:#fff;border:1px dashed var(--line);border-radius:var(--radius-card);
}
.ld-empty svg{width:52px;height:52px;color:#B7CBDE;}
.ld-empty-title{font-size:16px;font-weight:700;color:var(--ink-900);}
.ld-empty-desc{font-size:13.5px;color:var(--ink-500);}

/* ---------- 标签 ---------- */
.ld-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:32px;}
.ld-tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--ink-700);font-size:13px;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.ld-tag:hover{background:var(--brand-50);color:var(--brand-600);border-color:var(--brand-500);}

/* ---------- 侧栏 ---------- */
.ld-sidebar{display:flex;flex-direction:column;gap:20px;position:sticky;top:88px;}
.ld-side-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:20px;box-shadow:var(--shadow-card);
}
.ld-side-title{
  display:flex;align-items:center;gap:8px;
  font-size:14px;font-weight:700;color:var(--ink-900);letter-spacing:.02em;margin-bottom:14px;
}
.ld-side-title::before{content:"";width:3px;height:14px;border-radius:2px;background:var(--teal);}
.ld-toc-list{display:flex;flex-direction:column;gap:2px;}
.ld-toc-link{
  display:block;padding:8px 10px;border-radius:8px;
  font-size:13.5px;line-height:1.55;color:var(--ink-700);
  border-left:2px solid transparent;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.ld-toc-link:hover{background:var(--brand-50);color:var(--brand-600);}
.ld-toc-link.is-active{background:var(--brand-50);color:var(--brand-600);border-left-color:var(--teal);font-weight:600;}
.ld-toc-empty{font-size:13.5px;color:var(--ink-500);padding:6px 2px;line-height:1.7;}
.ld-side-list{display:flex;flex-direction:column;gap:14px;}
.ld-side-item{display:flex;gap:12px;align-items:center;}
.ld-side-thumb{
  width:72px;height:54px;flex:0 0 72px;border-radius:8px;overflow:hidden;background:#E8EFF7;
}
.ld-side-thumb img{width:100%;height:100%;object-fit:cover;}
.ld-side-item-title{font-size:14px;line-height:1.5;color:var(--ink-900);font-weight:600;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.ld-side-item-title:hover{color:var(--brand-600);}
.ld-side-item-desc{font-size:12.5px;color:var(--ink-500);margin-top:2px;}
.ld-side-actions{display:flex;flex-direction:column;gap:10px;}

/* ---------- CTA 带 ---------- */
.ld-cta-band{
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  background:var(--brand-50);border-radius:18px;padding:26px 30px;
}
.ld-cta-band h3{font-size:20px;line-height:1.4;}
.ld-cta-band p{font-size:14px;color:var(--ink-500);margin-top:6px;}
.ld-cta-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ---------- 卡片网格 ---------- */
.ld-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;}
.ld-card{
  display:flex;flex-direction:column;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;box-shadow:var(--shadow-card);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.ld-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D3E2EF;}
.ld-card-media{aspect-ratio:4/3;background:#E8EFF7;overflow:hidden;position:relative;}
.ld-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease;}
.ld-card:hover .ld-card-media img{transform:scale(1.03);}
.ld-card-badge{position:absolute;left:12px;top:12px;background:rgba(255,255,255,.94);}
.ld-card-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.ld-card-title{
  font-size:16.5px;line-height:1.5;font-weight:700;color:var(--ink-900);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.ld-card:hover .ld-card-title{color:var(--brand-600);}
.ld-card-desc{
  font-size:13.5px;line-height:1.75;color:var(--ink-500);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.ld-card-foot{
  margin-top:auto;padding-top:12px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  font-size:12.5px;color:var(--ink-500);
}
.ld-arrow{display:inline-flex;align-items:center;color:var(--brand-600);transition:transform .2s ease;}
.ld-card:hover .ld-arrow{transform:translateX(4px);}

/* ---------- FAQ ---------- */
.ld-faq{display:flex;flex-direction:column;gap:12px;max-width:860px;}
.ld-faq-item{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;
}
.ld-faq-item.is-open{border-color:#CFE0EE;box-shadow:var(--shadow-card);}
.ld-faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:18px 22px;text-align:left;font-size:16.5px;font-weight:700;color:var(--ink-900);
  transition:color .2s ease;
}
.ld-faq-q:hover{color:var(--brand-600);}
.ld-faq-q:focus-visible{outline:3px solid rgba(33,95,154,.28);outline-offset:-3px;}
.ld-faq-icon{position:relative;width:20px;height:20px;flex:0 0 20px;color:var(--brand-600);}
.ld-faq-icon::before,.ld-faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;background:currentColor;border-radius:2px;
  transform:translate(-50%,-50%);transition:transform .25s ease,opacity .25s ease;
}
.ld-faq-icon::before{width:14px;height:2px;}
.ld-faq-icon::after{width:2px;height:14px;}
.ld-faq-item.is-open .ld-faq-icon::after{transform:translate(-50%,-50%) rotate(90deg);opacity:0;}
.ld-faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;padding:0 22px;}
.ld-faq-a p{font-size:15px;line-height:1.8;color:var(--ink-700);}
.ld-faq-item.is-open .ld-faq-a{padding-bottom:20px;}

/* ---------- 返回 ---------- */
.ld-return-row{display:flex;justify-content:center;padding:44px 0 0;}

/* ---------- 页脚 ---------- */
.ld-footer{background:var(--brand-700);color:rgba(255,255,255,.88);margin-top:72px;padding:56px 0 26px;}
.ld-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;}
.ld-footer .ld-logo{color:#fff;}
.ld-footer .ld-logo:hover{color:#D9E9F7;}
.ld-footer .ld-logo-mark{color:#8CB8DE;}
.ld-footer .ld-logo-text small{color:rgba(255,255,255,.6);}
.ld-footer-about{font-size:14px;line-height:1.9;color:rgba(255,255,255,.75);margin-top:16px;max-width:340px;}
.ld-footer h4{color:#fff;font-size:15px;letter-spacing:.02em;margin-bottom:14px;}
.ld-footer-list li a{display:inline-block;font-size:14px;line-height:2.1;color:rgba(255,255,255,.82);}
.ld-footer-list li a:hover{color:#fff;text-decoration:underline;}
.ld-footer-bottom{
  margin-top:38px;padding-top:20px;border-top:1px solid rgba(255,255,255,.16);
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.62);
}

/* ---------- 响应式 ---------- */
@media (max-width:1023px){
  .ld-container{padding:0 24px;}
  .ld-nav{display:none;}
  .ld-menu-btn{display:inline-flex;}
  .ld-header-actions .ld-btn-primary{display:none;}
  .ld-article-layout{grid-template-columns:minmax(0,1fr);gap:32px;}
  .ld-sidebar{position:static;top:auto;}
  .ld-grid-3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .ld-footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
  .ld-section{padding:52px 0 0;}
  .ld-article-body{max-width:none;font-size:16.5px;}
}
@media (max-width:639px){
  .ld-container{padding:0 16px;}
  .ld-header-inner{height:56px;gap:12px;}
  .ld-drawer{top:56px;}
  .ld-logo{font-size:17px;}
  .ld-logo-mark{width:26px;height:26px;flex:0 0 26px;}
  .ld-post-title{font-size:26px;}
  .ld-section-title{font-size:23px;}
  .ld-article-body{font-size:15.5px;line-height:1.85;}
  .ld-article-body h2{font-size:21px;margin-top:32px;}
  .ld-article-body h3{font-size:18px;}
  .ld-grid-3{grid-template-columns:minmax(0,1fr);}
  .ld-footer-grid{grid-template-columns:minmax(0,1fr);}
  .ld-cta-band{padding:22px 20px;}
  .ld-cta-actions{width:100%;}
  .ld-cta-actions .ld-btn{flex:1 1 100%;}
  .ld-post-tools{width:100%;}
  .ld-crumb-current{max-width:210px;}
  .ld-footer{margin-top:52px;padding:44px 0 22px;}
}

/* roulang page: category1 */
:root{
  --brand-700:#17456E;
  --brand-600:#215F9A;
  --brand-500:#2E77B8;
  --brand-50:#EDF4FB;
  --accent-teal:#17998F;
  --accent-amber:#F08A24;
  --ink-900:#12263F;
  --ink-700:#2E3E4E;
  --ink-500:#61788C;
  --line:#E3EBF3;
  --bg-page:#F6F9FC;
  --bg-card:#FFFFFF;
  --radius-card:14px;
  --radius-img:10px;
  --radius-btn:10px;
  --shadow-card:0 8px 24px rgba(18,38,63,.06);
  --shadow-hover:0 14px 34px rgba(18,38,63,.10);
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;padding:0;background:var(--bg-page);color:var(--ink-700);
  font-family:var(--font-cn);font-size:16px;line-height:1.85;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none;transition:color .2s ease}
button{font-family:inherit;font-size:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);letter-spacing:.01em;font-weight:800}
p{margin:0 0 16px}
ul,ol{margin:0;padding:0;list-style:none}
.ld-container{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}
.ld-visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(33,95,154,.28);outline-offset:2px;border-radius:8px}

/* ============ 顶部导航 ============ */
.ld-site-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.ld-header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:64px}
.ld-logo{display:inline-flex;align-items:center;gap:10px;color:var(--brand-700);font-size:18px;font-weight:800;letter-spacing:.01em;flex:0 0 auto}
.ld-logo-mark{width:30px;height:30px;color:var(--brand-600);flex:0 0 auto}
.ld-logo-text small{font-size:11px;font-weight:600;color:var(--brand-500);margin-left:4px;letter-spacing:.1em;vertical-align:2px}
.ld-nav{display:flex;align-items:center;gap:4px}
.ld-nav-link{position:relative;padding:10px 14px;font-size:15px;color:var(--ink-700);border-radius:8px;transition:background .2s ease,color .2s ease}
.ld-nav-link:hover{color:var(--brand-600);background:var(--brand-50)}
.ld-nav-link.is-active{color:var(--brand-600);font-weight:700}
.ld-nav-link.is-active::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:2px;width:18px;height:2px;background:var(--brand-600);border-radius:2px}
.ld-header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.ld-icon-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--brand-600);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background .2s ease,border-color .2s ease,transform .2s ease}
.ld-icon-btn:hover{background:var(--brand-50);border-color:var(--brand-500)}
.ld-burger{display:none}
.ld-search-bar{display:none;border-top:1px solid var(--line);background:#fff}
.ld-search-bar.is-open{display:block}
.ld-search-inner{display:flex;gap:12px;padding:14px 0}
.ld-search-input{flex:1 1 auto;height:44px;border-radius:var(--radius-btn);border:1px solid var(--line);background:var(--bg-page);padding:0 16px;font-size:15px;color:var(--ink-900)}
.ld-search-input::placeholder{color:var(--ink-500)}
.ld-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;line-height:1;cursor:pointer;border:1.5px solid transparent;transition:background .22s ease,color .22s ease,box-shadow .22s ease,transform .22s ease,border-color .22s ease}
.ld-btn-primary{background:var(--brand-600);color:#fff;border-color:var(--brand-600)}
.ld-btn-primary:hover{background:var(--brand-700);border-color:var(--brand-700);box-shadow:0 6px 16px rgba(33,95,154,.24);transform:translateY(-1px)}
.ld-btn-primary:active{transform:translateY(0);box-shadow:none}
.ld-btn-ghost{background:transparent;color:var(--brand-600);border-color:var(--brand-600)}
.ld-btn-ghost:hover{background:var(--brand-50);box-shadow:0 6px 16px rgba(33,95,154,.12)}
.ld-btn-sm{padding:9px 18px;font-size:14px}
.ld-btn[disabled]{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.ld-text-link{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:600;color:var(--brand-600);border-bottom:2px solid transparent;transition:border-color .22s ease,color .22s ease}
.ld-text-link:hover{color:var(--brand-700);border-bottom-color:var(--brand-700)}
.ld-drawer{position:fixed;inset:0;z-index:90;background:#fff;display:none;flex-direction:column;padding:18px 20px 24px;overflow-y:auto}
.ld-drawer.is-open{display:flex}
.ld-drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:16px;border-bottom:1px solid var(--line)}
.ld-drawer-nav{display:flex;flex-direction:column;margin-top:8px}
.ld-drawer-nav a{font-size:17px;padding:16px 4px;border-bottom:1px solid var(--line);color:var(--ink-700)}
.ld-drawer-nav a.is-active{color:var(--brand-600);font-weight:700}
.ld-drawer-foot{margin-top:auto;padding-top:24px}

/* ============ 面包屑 ============ */
.ld-breadcrumb{font-size:13px;color:var(--ink-500);padding:20px 0 0}
.ld-breadcrumb a{color:var(--ink-500)}
.ld-breadcrumb a:hover{color:var(--brand-600)}
.ld-breadcrumb span.sep{margin:0 8px;color:#B9C8D6}
.ld-breadcrumb .current{color:var(--ink-500)}

/* ============ Hero ============ */
.ld-hero{padding:34px 0 0}
.ld-hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center}
.ld-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--brand-600);background:var(--brand-50);padding:6px 14px;border-radius:999px}
.ld-eyebrow::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--brand-600)}
.ld-hero h1{font-size:46px;line-height:1.15;margin:20px 0 18px}
.ld-hero-lead{font-size:16.5px;color:var(--ink-700);max-width:520px;margin:0 0 8px}
.ld-hero-lead span{display:block}
.ld-hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.ld-stats{display:flex;flex-wrap:wrap;gap:36px;margin-top:34px;padding-top:24px;border-top:1px solid var(--line)}
.ld-stat-num{font-size:26px;font-weight:800;color:var(--accent-amber);line-height:1.2;font-variant-numeric:tabular-nums}
.ld-stat-label{font-size:13px;color:var(--ink-500);margin-top:2px}
.ld-hero-visual{position:relative;padding-bottom:24px}
.ld-hero-figure{position:relative;aspect-ratio:4/3;border-radius:18px;overflow:hidden;background:#E8EFF7;box-shadow:0 18px 40px rgba(18,38,63,.12)}
.ld-hero-figure img{width:100%;height:100%;object-fit:cover}
.ld-hero-figure::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(18,38,63,0) 55%,rgba(18,38,63,.22) 100%)}
.ld-float-card{position:absolute;right:-6px;bottom:0;width:248px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:0 12px 30px rgba(18,38,63,.14)}
.ld-float-card .fc-title{font-size:12.5px;letter-spacing:.08em;color:var(--ink-500);margin:0 0 8px}
.ld-float-card .fc-main{font-size:19px;font-weight:800;color:var(--brand-700);line-height:1.35;margin:0 0 6px;font-variant-numeric:tabular-nums}
.ld-float-card .fc-sub{font-size:12.5px;color:var(--ink-500);line-height:1.6;margin:0}

/* ============ 通用板块 ============ */
.ld-section{padding:88px 0 0}
.ld-section--flat{padding:64px 0 0}
.ld-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:34px;flex-wrap:wrap}
.ld-section-title{font-size:32px;line-height:1.25;display:flex;align-items:center;gap:12px}
.ld-section-title::before{content:"";width:4px;height:24px;border-radius:2px;background:var(--accent-teal);flex:0 0 auto}
.ld-section-desc{font-size:14.5px;color:var(--ink-500);margin:10px 0 0;max-width:720px}
.ld-badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;font-size:12.5px;font-weight:700;background:var(--brand-50);color:var(--brand-600);white-space:nowrap}
.ld-badge--outline{background:#fff;border:1px solid var(--accent-teal);color:var(--accent-teal)}
.ld-badge--amber{background:#FEF1E3;color:#C46A0D}

/* ============ 目录区 ============ */
.ld-catalog{display:grid;grid-template-columns:3fr 9fr;gap:36px;align-items:start}
.ld-filter{position:sticky;top:88px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow-card)}
.ld-filter-title{font-size:12.5px;letter-spacing:.1em;color:var(--ink-500);margin:0 0 12px;font-weight:700}
.ld-filter-list{display:flex;flex-direction:column;gap:2px}
.ld-filter-item a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;border-radius:8px;font-size:15px;color:var(--ink-700);border-left:3px solid transparent;transition:background .2s ease,color .2s ease,border-color .2s ease}
.ld-filter-item a:hover{background:var(--brand-50);color:var(--brand-600)}
.ld-filter-item.is-current a{border-left-color:var(--accent-teal);background:var(--brand-50);color:var(--brand-700);font-weight:700}
.ld-filter-count{font-size:12.5px;color:var(--ink-500);font-variant-numeric:tabular-nums}
.ld-filter-note{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--ink-500);line-height:1.7}
.ld-catalog-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.ld-catalog-total{font-size:14px;color:var(--ink-500)}
.ld-catalog-total b{color:var(--brand-700);font-variant-numeric:tabular-nums}
.ld-select{height:42px;border-radius:var(--radius-btn);border:1px solid var(--line);background:#fff;color:var(--ink-700);font-size:14px;padding:0 12px;min-width:160px}
.ld-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.ld-topic-card{position:relative;display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card);transition:transform .24s ease,box-shadow .24s ease,border-color .24s ease}
.ld-topic-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D3E2F0}
.ld-topic-media{position:relative;aspect-ratio:4/3;background:#E8EFF7;overflow:hidden}
.ld-topic-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.ld-topic-card:hover .ld-topic-media img{transform:scale(1.04)}
.ld-topic-media .ld-badge{position:absolute;top:12px;left:12px;background:#fff;border:1px solid var(--accent-teal);color:var(--accent-teal)}
.ld-topic-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1 1 auto}
.ld-topic-title{font-size:19px;line-height:1.4}
.ld-topic-card:hover .ld-topic-title{color:var(--brand-600)}
.ld-topic-desc{font-size:14px;color:var(--ink-500);line-height:1.75;margin:0}
.ld-topic-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:12px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--ink-500);font-variant-numeric:tabular-nums}
.ld-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:var(--brand-600);font-size:13.5px}
.ld-topic-card:hover .ld-arrow svg{transform:translateX(4px)}
.ld-arrow svg{transition:transform .24s ease}

/* ============ 深色节奏块 ============ */
.ld-band{background:var(--brand-700);color:#fff;border-radius:18px;padding:44px 44px 40px;display:grid;grid-template-columns:1.15fr 1fr;gap:40px;align-items:center}
.ld-band h2{color:#fff;font-size:30px;line-height:1.3;margin:0 0 14px}
.ld-band p{color:rgba(255,255,255,.82);font-size:15px;margin:0;max-width:440px}
.ld-band-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.ld-band-metric{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:12px;padding:16px}
.ld-band-metric b{display:block;font-size:22px;color:#fff;font-variant-numeric:tabular-nums;line-height:1.3}
.ld-band-metric span{font-size:12.5px;color:rgba(255,255,255,.72)}

/* ============ 步骤 ============ */
.ld-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ld-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:26px 24px;box-shadow:var(--shadow-card);transition:transform .24s ease,box-shadow .24s ease}
.ld-step:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.ld-step-num{width:40px;height:40px;border-radius:50%;border:1.5px solid var(--brand-500);color:var(--brand-600);font-weight:800;display:flex;align-items:center;justify-content:center;font-variant-numeric:tabular-nums;margin-bottom:16px}
.ld-step h3{font-size:18px;margin-bottom:8px}
.ld-step p{font-size:14.5px;color:var(--ink-500);margin:0}

/* ============ 场景 ============ */
.ld-scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.ld-scene{display:flex;gap:16px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:22px 22px 20px;transition:border-color .22s ease,box-shadow .22s ease,transform .22s ease}
.ld-scene:hover{border-color:#D3E2F0;box-shadow:var(--shadow-card);transform:translateY(-2px)}
.ld-scene-icon{width:44px;height:44px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.ld-scene h3{font-size:17px;margin:0 0 6px}
.ld-scene p{font-size:14px;color:var(--ink-500);margin:0}

/* ============ FAQ ============ */
.ld-faq{max-width:860px}
.ld-faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);margin-bottom:12px;overflow:hidden;transition:box-shadow .22s ease,border-color .22s ease}
.ld-faq-item:hover{border-color:#D3E2F0;box-shadow:var(--shadow-card)}
.ld-faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:19px 22px;background:none;border:0;text-align:left;font-size:17px;font-weight:700;color:var(--ink-900);cursor:pointer;line-height:1.5}
.ld-faq-icon{position:relative;width:22px;height:22px;flex:0 0 auto}
.ld-faq-icon::before,.ld-faq-icon::after{content:"";position:absolute;background:var(--brand-600);border-radius:2px;transition:transform .28s ease,opacity .28s ease}
.ld-faq-icon::before{top:10px;left:2px;width:18px;height:2px}
.ld-faq-icon::after{left:10px;top:2px;width:2px;height:18px}
.ld-faq-item.is-open .ld-faq-icon::after{transform:rotate(90deg);opacity:0}
.ld-faq-a{max-height:0;overflow:hidden;transition:max-height .32s ease}
.ld-faq-a-inner{padding:0 22px 20px;font-size:15px;line-height:1.8;color:var(--ink-700)}
.ld-faq-a-inner p{margin:0}

/* ============ CTA ============ */
.ld-cta-band{background:var(--brand-50);border-radius:18px;padding:40px;display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.ld-cta-band h2{font-size:26px;line-height:1.35;margin:0 0 8px}
.ld-cta-band p{font-size:14.5px;color:var(--ink-500);margin:0}
.ld-cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ============ 页脚 ============ */
.ld-footer{background:var(--brand-700);color:rgba(255,255,255,.88);padding:64px 0 0;margin-top:88px}
.ld-footer .ld-logo{color:#fff}
.ld-footer .ld-logo-mark{color:#fff}
.ld-footer .ld-logo-text small{color:rgba(255,255,255,.65)}
.ld-footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:36px}
.ld-footer-about{font-size:14px;line-height:1.85;color:rgba(255,255,255,.75);margin:16px 0 0;max-width:330px}
.ld-footer h4{font-size:15px;color:#fff;margin:0;font-weight:700}
.ld-footer-list{margin-top:16px;display:flex;flex-direction:column;gap:10px;font-size:14.5px}
.ld-footer-list a{color:rgba(255,255,255,.82)}
.ld-footer-list a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.ld-footer-bottom{border-top:1px solid rgba(255,255,255,.16);margin-top:44px;padding:20px 0;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.68)}

/* ============ 响应式 ============ */
@media (max-width:1023px){
  .ld-nav{display:none}
  .ld-burger{display:inline-flex}
  .ld-header-inner{height:60px}
  .ld-hero-grid{grid-template-columns:1fr;gap:32px}
  .ld-hero h1{font-size:34px;margin:16px 0 14px}
  .ld-hero-visual{padding-bottom:0}
  .ld-float-card{position:static;width:100%;margin-top:16px}
  .ld-hero-figure::after{display:none}
  .ld-section{padding:64px 0 0}
  .ld-catalog{grid-template-columns:1fr;gap:24px}
  .ld-filter{position:static}
  .ld-filter-list{flex-direction:row;overflow-x:auto;gap:8px;padding-bottom:4px}
  .ld-filter-item a{border-left:0;border-bottom:2px solid transparent;white-space:nowrap;padding:8px 14px;border-radius:8px}
  .ld-filter-item.is-current a{border-left:0;border-bottom-color:var(--accent-teal)}
  .ld-filter-note{display:none}
  .ld-section-title{font-size:26px}
  .ld-band{grid-template-columns:1fr;padding:32px 26px;gap:26px}
  .ld-band h2{font-size:24px}
  .ld-steps{grid-template-columns:1fr}
  .ld-footer-grid{grid-template-columns:1fr 1fr;gap:30px}
  .ld-footer{margin-top:64px}
}
@media (max-width:639px){
  .ld-container{padding:0 16px}
  .ld-header-inner{height:56px;gap:12px}
  .ld-logo{font-size:16px}
  .ld-logo-mark{width:26px;height:26px}
  .ld-btn{padding:12px 18px;font-size:15px}
  .ld-btn-sm{padding:9px 14px;font-size:13.5px}
  .ld-hero h1{font-size:30px}
  .ld-hero-lead{font-size:15.5px}
  .ld-stats{gap:22px}
  .ld-stat-num{font-size:22px}
  .ld-section{padding:48px 0 0}
  .ld-section-title{font-size:22px;gap:10px}
  .ld-section-title::before{height:20px}
  .ld-section-desc{font-size:14px}
  .ld-card-grid{grid-template-columns:1fr}
  .ld-scene-grid{grid-template-columns:1fr}
  .ld-cta-band{padding:26px 20px}
  .ld-cta-band h2{font-size:21px}
  .ld-cta-actions{width:100%}
  .ld-cta-actions .ld-btn{flex:1 1 100%}
  .ld-band-metrics{grid-template-columns:1fr 1fr}
  .ld-faq-q{font-size:15.5px;padding:16px 18px}
  .ld-footer-grid{grid-template-columns:1fr;gap:28px}
  .ld-footer{padding-top:44px}
  .ld-footer-bottom{flex-direction:column;align-items:flex-start;font-size:12.5px}
}

/* roulang page: category3 */
:root{
  --brand-700:#17456E;
  --brand-600:#215F9A;
  --brand-500:#2E77B8;
  --brand-50:#EDF4FB;
  --accent-teal:#17998F;
  --accent-amber:#F08A24;
  --ink-900:#12263F;
  --ink-700:#2E3E4E;
  --ink-500:#61788C;
  --line:#E3EBF3;
  --bg-page:#F6F9FC;
  --bg-card:#FFFFFF;
  --radius-card:14px;
  --radius-img:10px;
  --radius-btn:10px;
  --shadow-card:0 8px 24px rgba(18,38,63,.06);
  --shadow-hover:0 14px 34px rgba(18,38,63,.10);
  --shadow-btn:0 6px 16px rgba(33,95,154,.24);
  --gap-section:88px;
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Source Han Sans",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg-page);color:var(--ink-700);font-family:var(--font-cn);font-size:16px;line-height:1.85;letter-spacing:.01em;text-align:left}
img{max-width:100%;display:block;border:0}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease,opacity .18s ease}
a:hover{color:var(--brand-700)}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;letter-spacing:.01em;line-height:1.3;text-align:left}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid rgba(33,95,154,.28);outline-offset:2px;border-radius:6px}
.ld-container{max-width:1200px;margin:0 auto;padding:0 32px;width:100%}
.ld-narrow{max-width:1120px}
.ld-section{padding:var(--gap-section) 0}
.ld-section--tight{padding:56px 0}
.ld-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.ld-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-600);letter-spacing:.06em}
.ld-eyebrow::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--brand-600)}
.ld-h2{font-size:32px;line-height:1.25;margin-top:10px}
.ld-h2--line{position:relative;padding-left:16px}
.ld-h2--line::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:var(--accent-teal)}
.ld-h3{font-size:21px;line-height:1.4}
.ld-lead{font-size:16px;color:var(--ink-700)}
.ld-muted{color:var(--ink-500);font-size:14px;line-height:1.75}

/* header */
.ld-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.ld-header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:64px}
.ld-logo{display:inline-flex;align-items:center;gap:10px;color:var(--ink-900);font-weight:700;font-size:19px;letter-spacing:.02em}
.ld-logo:hover{color:var(--brand-600)}
.ld-logo-mark{width:30px;height:30px;color:var(--brand-600);flex:0 0 auto}
.ld-logo-text small{font-size:12px;font-weight:500;color:var(--ink-500);margin-left:4px;letter-spacing:.04em}
.ld-nav{display:flex;align-items:center;gap:6px}
.ld-nav-link{position:relative;display:inline-block;padding:10px 14px;font-size:15px;color:var(--ink-700);border-radius:8px;font-weight:500}
.ld-nav-link:hover{color:var(--brand-600);background:var(--brand-50)}
.ld-nav-link.is-active{color:var(--brand-600);font-weight:600}
.ld-nav-link.is-active::after{content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;border-radius:2px;background:var(--brand-600)}
.ld-header-actions{display:flex;align-items:center;gap:12px}
.ld-icon-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink-700);cursor:pointer;transition:all .18s ease}
.ld-icon-btn:hover{color:var(--brand-600);border-color:var(--brand-500);background:var(--brand-50)}
.ld-icon-btn svg{width:18px;height:18px;stroke-width:1.5}
.ld-burger{display:none}

/* buttons */
.ld-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;line-height:1.2;cursor:pointer;border:1.5px solid transparent;transition:all .2s ease;text-align:center}
.ld-btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 2px 8px rgba(33,95,154,.16)}
.ld-btn-primary:hover{background:var(--brand-700);color:#fff;box-shadow:var(--shadow-btn);transform:translateY(-1px)}
.ld-btn-primary:active{transform:translateY(0);box-shadow:none}
.ld-btn-ghost{background:transparent;color:var(--brand-600);border-color:var(--brand-600)}
.ld-btn-ghost:hover{background:var(--brand-50);color:var(--brand-700);border-color:var(--brand-700)}
.ld-btn-soft{background:#fff;color:var(--brand-600);border-color:var(--line)}
.ld-btn-soft:hover{background:var(--brand-50);border-color:var(--brand-500)}
.ld-btn-sm{padding:9px 18px;font-size:14px}
.ld-btn-block{width:100%}
.ld-link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600);position:relative}
.ld-link-arrow svg{width:14px;height:14px;transition:transform .2s ease}
.ld-link-arrow:hover svg{transform:translateX(4px)}

/* badges / tags */
.ld-badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;font-size:12.5px;font-weight:600;background:var(--brand-50);color:var(--brand-600);letter-spacing:.02em}
.ld-badge--teal{background:transparent;color:var(--accent-teal);border:1px solid var(--accent-teal)}
.ld-badge--amber{background:rgba(240,138,36,.12);color:#B86412}
.ld-tag{display:inline-flex;align-items:center;padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink-700);font-size:14px;cursor:pointer;transition:all .18s ease}
.ld-tag:hover{border-color:var(--brand-500);color:var(--brand-600);background:var(--brand-50)}
.ld-tag.is-active{background:var(--brand-600);border-color:var(--brand-600);color:#fff}

/* hero */
.ld-hero{position:relative;padding:44px 0 72px;background:linear-gradient(180deg,var(--brand-50) 0%,rgba(246,249,252,0) 78%);border-bottom:1px solid var(--line)}
.ld-hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center}
.ld-crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-500);margin-bottom:20px;flex-wrap:wrap}
.ld-crumbs a{color:var(--ink-500)}
.ld-crumbs a:hover{color:var(--brand-600)}
.ld-crumbs .sep{color:#B8C7D6}
.ld-crumbs .current{color:var(--ink-500)}
.ld-hero h1{font-size:46px;line-height:1.15;margin:14px 0 18px}
.ld-hero-sub{font-size:17px;line-height:1.85;color:var(--ink-700);max-width:540px}
.ld-hero-actions{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.ld-hero-stats{display:flex;gap:40px;margin-top:40px;flex-wrap:wrap}
.ld-stat-value{font-size:26px;font-weight:700;color:var(--accent-amber);font-variant-numeric:tabular-nums;line-height:1.2}
.ld-stat-label{font-size:13px;color:var(--ink-500);margin-top:2px}
.ld-hero-visual{position:relative}
.ld-hero-img{border-radius:18px;overflow:hidden;background:#E8EFF7;aspect-ratio:4/3;box-shadow:var(--shadow-card)}
.ld-hero-img img{width:100%;height:100%;object-fit:cover}
.ld-hero-card{position:absolute;right:-8px;bottom:-26px;width:250px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow-hover)}
.ld-hero-card h4{font-size:15px;margin-bottom:6px}
.ld-hero-card p{font-size:13px;color:var(--ink-500);line-height:1.7}

/* generic card grids */
.ld-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.ld-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.ld-grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.ld-card{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-card);transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease}
.ld-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D5E3F0}
.ld-card-icon{width:44px;height:44px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);display:inline-flex;align-items:center;justify-content:center;margin-bottom:16px}
.ld-card-icon svg{width:22px;height:22px;stroke-width:1.5}
.ld-card h3{font-size:18px;margin-bottom:8px}
.ld-card p{font-size:14.5px;color:var(--ink-700);line-height:1.8}
.ld-card-list{margin-top:14px;display:grid;gap:6px}
.ld-card-list li{position:relative;padding-left:16px;font-size:13.5px;color:var(--ink-500);line-height:1.7}
.ld-card-list li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:2px;background:var(--accent-teal)}

/* split explain section */
.ld-split{display:grid;grid-template-columns:1.45fr 1fr;gap:44px;align-items:start}
.ld-prose h2{margin-top:0}
.ld-prose h2:not(:first-child){margin-top:44px}
.ld-prose h3{margin-top:28px;font-size:19px;color:var(--ink-900)}
.ld-prose p{margin-top:14px;font-size:16px;line-height:1.9;color:var(--ink-700)}
.ld-prose p.ld-muted{font-size:14px;color:var(--ink-500)}
.ld-steps{margin-top:22px;display:grid;gap:20px}
.ld-step{display:grid;grid-template-columns:44px 1fr;gap:16px;align-items:start}
.ld-step-num{width:34px;height:34px;border-radius:999px;border:1.5px solid var(--brand-500);color:var(--brand-600);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;font-variant-numeric:tabular-nums;background:#fff}
.ld-step h4{font-size:16.5px;margin-bottom:4px}
.ld-step p{font-size:14.5px;color:var(--ink-700);line-height:1.8;margin:0}
.ld-sticky-card{position:sticky;top:88px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-card)}
.ld-sticky-card h3{font-size:18px;margin:14px 0 4px}
.ld-sticky-card .ld-card-list{margin-top:12px;gap:10px}
.ld-sticky-card .ld-card-list li{font-size:13.5px;color:var(--ink-700)}
.ld-divider{height:1px;background:var(--line);margin:18px 0;border:0}
.ld-note{background:var(--brand-50);border-radius:12px;padding:14px 16px;font-size:13.5px;color:var(--ink-700);line-height:1.75;border-left:3px solid var(--brand-500)}

/* list rows */
.ld-rows{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card)}
.ld-row{display:grid;grid-template-columns:1.15fr 1.6fr auto;gap:20px;align-items:center;padding:20px 24px;border-bottom:1px solid var(--line);transition:background .18s ease}
.ld-row:last-child{border-bottom:0}
.ld-row:hover{background:var(--brand-50)}
.ld-row-title{font-size:16px;font-weight:600;color:var(--ink-900)}
.ld-row-desc{font-size:14px;color:var(--ink-500);line-height:1.7}
.ld-row-meta{font-size:13px;color:var(--ink-500);font-variant-numeric:tabular-nums;white-space:nowrap;display:inline-flex;align-items:center;gap:8px}
.ld-row-meta svg{width:14px;height:14px}

/* carousel */
.ld-rail{position:relative}
.ld-rail-track{display:flex;gap:20px;overflow-x:auto;scroll-behavior:smooth;padding:6px 2px 18px;scrollbar-width:none}
.ld-rail-track::-webkit-scrollbar{display:none}
.ld-rail-card{flex:0 0 280px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card);transition:transform .22s ease,box-shadow .22s ease}
.ld-rail-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.ld-rail-img{aspect-ratio:4/3;background:#E8EFF7;overflow:hidden}
.ld-rail-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.ld-rail-card:hover .ld-rail-img img{transform:scale(1.04)}
.ld-rail-body{padding:16px 18px 20px}
.ld-rail-body h3{font-size:16px;line-height:1.45;margin:8px 0 6px}
.ld-rail-body p{font-size:13.5px;color:var(--ink-500);line-height:1.7}
.ld-rail-nav{display:flex;gap:10px}

/* FAQ */
.ld-faq{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card)}
.ld-faq-item{border-bottom:1px solid var(--line)}
.ld-faq-item:last-child{border-bottom:0}
.ld-faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:22px 24px;background:transparent;border:0;cursor:pointer;text-align:left;font-size:17px;font-weight:700;color:var(--ink-900);line-height:1.5;transition:background .18s ease}
.ld-faq-q:hover{background:var(--brand-50)}
.ld-faq-icon{flex:0 0 auto;width:24px;height:24px;position:relative}
.ld-faq-icon::before,.ld-faq-icon::after{content:"";position:absolute;background:var(--brand-600);border-radius:2px;transition:transform .22s ease,opacity .22s ease}
.ld-faq-icon::before{left:4px;right:4px;top:11px;height:2px}
.ld-faq-icon::after{top:4px;bottom:4px;left:11px;width:2px}
.ld-faq-item.is-open .ld-faq-icon::after{transform:scaleY(0);opacity:0}
.ld-faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.ld-faq-a-inner{padding:0 24px 24px;font-size:15px;line-height:1.85;color:var(--ink-700)}

/* CTA band */
.ld-cta{position:relative;border-radius:18px;overflow:hidden;padding:48px;background:var(--brand-700);color:#fff}
.ld-cta::before{content:"";position:absolute;inset:0;background-image:url('/assets/images/backpic/back-2.webp');background-size:cover;background-position:center;opacity:.22}
.ld-cta-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.ld-cta h2{color:#fff;font-size:30px;line-height:1.3}
.ld-cta p{color:rgba(255,255,255,.82);font-size:15px;margin-top:10px;max-width:560px;line-height:1.8}
.ld-cta-actions{display:flex;gap:14px;flex-wrap:wrap}
.ld-cta .ld-btn-primary{background:#fff;color:var(--brand-700)}
.ld-cta .ld-btn-primary:hover{background:#EAF3FB;color:var(--brand-700);box-shadow:0 8px 20px rgba(0,0,0,.18)}
.ld-cta .ld-btn-ghost{color:#fff;border-color:rgba(255,255,255,.6)}
.ld-cta .ld-btn-ghost:hover{background:rgba(255,255,255,.14);color:#fff;border-color:#fff}
.ld-copy-tip{font-size:13px;color:rgba(255,255,255,.85);margin-left:4px;opacity:0;transition:opacity .2s ease}
.ld-copy-tip.is-on{opacity:1}

/* footer */
.ld-footer{background:var(--brand-700);color:rgba(255,255,255,.88);padding:64px 0 0;margin-top:0}
.ld-footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px}
.ld-footer .ld-logo{color:#fff}
.ld-footer .ld-logo-mark{color:#fff}
.ld-footer .ld-logo-text small{color:rgba(255,255,255,.6)}
.ld-footer-about{font-size:14px;line-height:1.85;color:rgba(255,255,255,.72);margin-top:16px;max-width:340px}
.ld-footer h4{font-size:15px;color:#fff;margin-bottom:16px;font-weight:600}
.ld-footer-list{display:grid;gap:10px}
.ld-footer-list a{font-size:14px;color:rgba(255,255,255,.78)}
.ld-footer-list a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.ld-footer-bottom{border-top:1px solid rgba(255,255,255,.16);padding:20px 0 26px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.6)}

/* mobile drawer */
.ld-drawer{position:fixed;inset:0;z-index:90;display:none}
.ld-drawer.is-open{display:block}
.ld-drawer-mask{position:absolute;inset:0;background:rgba(18,38,63,.45)}
.ld-drawer-panel{position:absolute;top:0;right:0;bottom:0;width:min(84vw,340px);background:#fff;padding:20px 20px 0;display:flex;flex-direction:column;box-shadow:-10px 0 40px rgba(18,38,63,.18);animation:ldSlide .24s ease}
@keyframes ldSlide{from{transform:translateX(24px);opacity:.6}to{transform:translateX(0);opacity:1}}
.ld-drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.ld-drawer-nav{display:grid;margin-top:8px}
.ld-drawer-nav a{padding:17px 4px;font-size:17px;color:var(--ink-900);border-bottom:1px solid var(--line);font-weight:500}
.ld-drawer-nav a.is-active{color:var(--brand-600);font-weight:700}
.ld-drawer-foot{margin-top:auto;padding:20px 0 24px}

@media (max-width:1023px){
  .ld-container{padding:0 24px}
  :root{--gap-section:64px}
  .ld-nav{display:none}
  .ld-burger{display:inline-flex}
  .ld-hero-grid{grid-template-columns:1fr;gap:36px}
  .ld-hero h1{font-size:34px}
  .ld-hero-img{aspect-ratio:16/9}
  .ld-hero-card{position:static;width:100%;margin-top:16px}
  .ld-grid-4{grid-template-columns:repeat(2,1fr)}
  .ld-grid-3{grid-template-columns:repeat(2,1fr)}
  .ld-split{grid-template-columns:1fr;gap:32px}
  .ld-sticky-card{position:static}
  .ld-footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .ld-h2{font-size:26px}
  .ld-cta{padding:36px}
  .ld-cta h2{font-size:24px}
}
@media (max-width:639px){
  .ld-container{padding:0 16px}
  :root{--gap-section:48px}
  body{font-size:15.5px}
  .ld-header-inner{height:56px}
  .ld-logo{font-size:17px}
  .ld-logo-mark{width:26px;height:26px}
  .ld-header-actions .ld-btn{display:none}
  .ld-hero{padding:28px 0 48px}
  .ld-hero h1{font-size:30px}
  .ld-hero-sub{font-size:15.5px}
  .ld-hero-stats{gap:24px}
  .ld-stat-value{font-size:22px}
  .ld-grid-4,.ld-grid-3,.ld-grid-2{grid-template-columns:1fr}
  .ld-row{grid-template-columns:1fr;gap:8px;padding:18px}
  .ld-row-meta{justify-self:start}
  .ld-h2{font-size:24px}
  .ld-h3{font-size:18px}
  .ld-card{padding:20px}
  .ld-hero-actions .ld-btn{width:100%}
  .ld-cta{padding:26px 20px;border-radius:14px}
  .ld-cta-inner{flex-direction:column;align-items:flex-start}
  .ld-cta-actions{width:100%}
  .ld-cta-actions .ld-btn{width:100%}
  .ld-footer-grid{grid-template-columns:1fr;gap:28px}
  .ld-footer{padding-top:48px}
  .ld-faq-q{font-size:16px;padding:18px}
  .ld-faq-a-inner{padding:0 18px 20px}
  .ld-rail-card{flex:0 0 240px}
}

/* roulang page: category2 */
:root{
  --brand-700:#17456E;
  --brand-600:#215F9A;
  --brand-500:#2E77B8;
  --brand-50:#EDF4FB;
  --accent-teal:#17998F;
  --accent-amber:#F08A24;
  --ink-900:#12263F;
  --ink-700:#2E3E4E;
  --ink-500:#61788C;
  --line:#E3EBF3;
  --bg-page:#F6F9FC;
  --bg-card:#FFFFFF;
  --radius-card:14px;
  --radius-img:10px;
  --radius-btn:10px;
  --shadow-sm:0 8px 24px rgba(18,38,63,.06);
  --shadow-md:0 14px 34px rgba(18,38,63,.10);
  --space-section:76px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;border-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--brand-700)}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;letter-spacing:.01em;line-height:1.25}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit;font-size:inherit;line-height:inherit;border:0;background:none;color:inherit;cursor:pointer}
:focus-visible{outline:3px solid rgba(33,95,154,.28);outline-offset:2px}
.ld-container{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}
.ld-num{font-variant-numeric:tabular-nums}

/* ============ 头部导航 ============ */
.ld-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.ld-header-inner{display:flex;align-items:center;gap:34px;height:64px}
.ld-logo{display:inline-flex;align-items:center;gap:10px;color:var(--ink-900);flex:0 0 auto}
.ld-logo:hover{color:var(--ink-900)}
.ld-logo-mark{width:30px;height:30px;color:var(--brand-600);flex:0 0 auto}
.ld-logo-text{font-size:18px;font-weight:700;letter-spacing:.02em;white-space:nowrap;line-height:1.2}
.ld-logo-text small{font-size:11px;font-weight:600;color:var(--brand-600);margin-left:4px;vertical-align:super;letter-spacing:.08em}
.ld-nav{display:flex;align-items:center;gap:28px;margin-left:6px}
.ld-nav-link{position:relative;display:inline-block;font-size:15px;font-weight:500;color:var(--ink-700);padding:21px 0}
.ld-nav-link::after{content:"";position:absolute;left:50%;bottom:11px;width:0;height:2px;border-radius:2px;background:var(--brand-600);transform:translateX(-50%);transition:width .22s ease}
.ld-nav-link:hover{color:var(--brand-600)}
.ld-nav-link:hover::after{width:18px}
.ld-nav-link.is-active{color:var(--brand-600);font-weight:600}
.ld-nav-link.is-active::after{width:18px}
.ld-nav-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.ld-icon-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--line);border-radius:var(--radius-btn);background:#fff;color:var(--ink-700);transition:background .2s ease,color .2s ease,border-color .2s ease}
.ld-icon-btn:hover{background:var(--brand-50);color:var(--brand-600);border-color:rgba(33,95,154,.35)}
.ld-icon-btn svg{width:18px;height:18px}
.ld-menu-btn{display:none}

/* 按钮 */
.ld-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;border:1.5px solid transparent;transition:background .2s ease,color .2s ease,box-shadow .2s ease,border-color .2s ease,transform .2s ease;white-space:nowrap}
.ld-btn-primary{background:var(--brand-600);color:#fff;border-color:var(--brand-600)}
.ld-btn-primary:hover{background:var(--brand-700);border-color:var(--brand-700);color:#fff;box-shadow:0 6px 16px rgba(33,95,154,.24)}
.ld-btn-outline{background:transparent;color:var(--brand-600);border-color:var(--brand-600)}
.ld-btn-outline:hover{background:var(--brand-50);color:var(--brand-700)}
.ld-btn-light{background:#fff;color:var(--brand-600);border-color:var(--line)}
.ld-btn-light:hover{background:var(--brand-50);border-color:rgba(33,95,154,.35)}
.ld-btn-sm{padding:9px 18px;font-size:14px}
.ld-btn:active{transform:translateY(1px)}

/* 搜索面板 */
.ld-search-panel{display:none;background:#fff;border-bottom:1px solid var(--line);padding:14px 0}
.ld-search-panel.is-open{display:block}
.ld-search-form{display:flex;gap:10px;align-items:center}
.ld-search-form .ld-search-input{flex:1 1 auto;height:44px;border:1px solid var(--line);border-radius:var(--radius-btn);padding:0 16px;font-size:15px;color:var(--ink-900);background:var(--brand-50);transition:background .2s ease,border-color .2s ease,box-shadow .2s ease}
.ld-search-form .ld-search-input::placeholder{color:var(--ink-500)}
.ld-search-form .ld-search-input:focus{outline:none;background:#fff;border-color:var(--brand-500);box-shadow:0 0 0 3px rgba(33,95,154,.14)}

/* 移动抽屉 */
.ld-drawer{position:fixed;top:0;right:0;bottom:0;width:min(88vw,360px);z-index:90;background:#fff;border-left:1px solid var(--line);box-shadow:-18px 0 40px rgba(18,38,63,.12);transform:translateX(105%);transition:transform .28s ease;display:flex;flex-direction:column;padding:18px 22px 22px}
.ld-drawer.is-open{transform:translateX(0)}
.ld-drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.ld-drawer-nav{flex:1 1 auto;padding-top:8px}
.ld-drawer-nav a{display:block;padding:17px 2px;font-size:17px;font-weight:500;color:var(--ink-900);border-bottom:1px solid var(--line)}
.ld-drawer-nav a:hover{color:var(--brand-600)}
.ld-drawer-nav a.is-active{color:var(--brand-600);font-weight:700}
.ld-drawer-cta{width:100%;margin-top:20px}
.ld-drawer-mask{position:fixed;inset:0;z-index:85;background:rgba(18,38,63,.42);opacity:0;visibility:hidden;transition:opacity .26s ease,visibility .26s ease}
.ld-drawer-mask.is-open{opacity:1;visibility:visible}
body.ld-locked{overflow:hidden}

/* ============ Hero ============ */
.ld-hero{background:linear-gradient(180deg,#fff 0%,#F8FBFE 58%,var(--bg-page) 100%);padding:56px 0 88px;border-bottom:1px solid var(--line)}
.ld-hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center}
.ld-eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:13px;font-weight:600;color:var(--brand-600);letter-spacing:.06em}
.ld-eyebrow::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--accent-teal);flex:0 0 auto}
.ld-h1{font-size:40px;line-height:1.2;margin:16px 0 20px;letter-spacing:.01em}
.ld-h1 em{font-style:normal;color:var(--brand-600)}
.ld-hero-sub{font-size:16px;line-height:1.9;color:var(--ink-700);max-width:540px}
.ld-hero-sub + .ld-hero-sub{margin-top:6px}
.ld-hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.ld-stats{display:flex;gap:44px;margin-top:36px;padding-top:24px;border-top:1px solid var(--line);flex-wrap:wrap}
.ld-stat-num{font-size:26px;font-weight:700;color:var(--accent-amber);line-height:1.25;font-variant-numeric:tabular-nums}
.ld-stat-num span{font-size:14px;font-weight:600;margin-left:2px;color:var(--accent-amber)}
.ld-stat-label{font-size:13px;color:var(--ink-500);margin-top:2px}
.ld-hero-media{position:relative}
.ld-hero-media > img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:18px;background:#E8EFF7;box-shadow:var(--shadow-md)}
.ld-hero-card{position:absolute;right:-6px;bottom:-30px;width:252px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow-md)}
.ld-hero-card .ld-badge{margin-bottom:10px}
.ld-hero-card h3{font-size:16px;line-height:1.5;margin-bottom:6px}
.ld-hero-card p{font-size:13px;line-height:1.7;color:var(--ink-500)}
.ld-hero-card a{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:600;margin-top:10px}

/* ============ 通用板块 ============ */
.ld-section{padding:var(--space-section) 0}
.ld-band-white{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.ld-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:36px}
.ld-h2{font-size:32px;line-height:1.28}
.ld-section-desc{font-size:15px;line-height:1.85;color:var(--ink-500);margin-top:10px;max-width:640px}
.ld-link-more{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-600);flex:0 0 auto}
.ld-link-more svg{width:15px;height:15px;transition:transform .2s ease}
.ld-link-more:hover svg{transform:translateX(4px)}

/* 徽章 */
.ld-badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;font-size:12.5px;font-weight:600;background:var(--brand-50);color:var(--brand-600);border:1px solid transparent;white-space:nowrap}
.ld-badge--teal{background:#fff;border-color:rgba(23,153,143,.45);color:var(--accent-teal)}
.ld-badge--amber{background:rgba(240,138,36,.12);border-color:rgba(240,138,36,.32);color:#BC6813}

/* 卡片 */
.ld-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ld-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .24s ease,box-shadow .24s ease}
.ld-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.ld-card-media{aspect-ratio:4/3;background:#E8EFF7;overflow:hidden}
.ld-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.ld-card:hover .ld-card-media img{transform:scale(1.04)}
.ld-card-body{display:flex;flex-direction:column;gap:10px;flex:1 1 auto;padding:20px 22px 22px}
.ld-card-title{font-size:19px;font-weight:700;line-height:1.45;color:var(--ink-900)}
.ld-card-text{font-size:14.5px;line-height:1.8;color:var(--ink-500)}
.ld-card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-500)}

/* 索引区 */
.ld-index-layout{display:grid;grid-template-columns:272px 1fr;gap:44px;align-items:start}
.ld-index-nav{position:sticky;top:88px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow-sm)}
.ld-index-nav-title{font-size:12.5px;letter-spacing:.1em;color:var(--ink-500);margin-bottom:10px;padding-left:12px}
.ld-index-nav a{position:relative;display:block;padding:11px 12px;border-radius:10px;font-size:15px;color:var(--ink-700);transition:background .2s ease,color .2s ease}
.ld-index-nav a::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:0;border-radius:2px;background:var(--accent-teal);transition:height .22s ease}
.ld-index-nav a:hover{background:var(--brand-50);color:var(--brand-600)}
.ld-index-nav a.is-current{background:var(--brand-50);color:var(--brand-600);font-weight:600}
.ld-index-nav a.is-current::before{height:20px}
.ld-index-group + .ld-index-group{margin-top:8px}
.ld-index-group-title{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--ink-500);padding:22px 16px 10px;margin:0}
.ld-index-list{border-top:1px solid var(--line)}
.ld-index-row{display:grid;grid-template-columns:46px 1fr auto;gap:18px;align-items:center;padding:20px 16px;border-bottom:1px dashed var(--line);border-radius:0;transition:background .2s ease}
.ld-index-row:hover{background:var(--brand-50)}
.ld-index-num{font-size:15px;font-weight:700;color:var(--ink-500);font-variant-numeric:tabular-nums}
.ld-index-name{font-size:17px;font-weight:600;color:var(--ink-900);line-height:1.5}
.ld-index-desc{font-size:14px;line-height:1.75;color:var(--ink-500);margin-top:3px}
.ld-index-meta{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--ink-500);white-space:nowrap}
.ld-index-arrow{display:inline-flex;color:var(--brand-600);transition:transform .22s ease}
.ld-index-arrow svg{width:17px;height:17px}
.ld-index-row:hover .ld-index-arrow{transform:translateX(4px)}

/* 场景 */
.ld-scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.ld-scene{display:grid;grid-template-columns:124px 1fr;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:16px;box-shadow:var(--shadow-sm);transition:transform .22s ease,box-shadow .22s ease}
.ld-scene:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.ld-scene-media{aspect-ratio:3/2;border-radius:var(--radius-img);overflow:hidden;background:#E8EFF7}
.ld-scene-media img{width:100%;height:100%;object-fit:cover}
.ld-scene h3{font-size:17px;line-height:1.5;margin-bottom:5px}
.ld-scene p{font-size:13.5px;line-height:1.75;color:var(--ink-500)}

/* 流程 */
.ld-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.ld-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:26px 22px;box-shadow:var(--shadow-sm);transition:transform .22s ease,box-shadow .22s ease}
.ld-step:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.ld-step-num{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;border:1.5px solid var(--brand-600);color:var(--brand-600);font-size:16px;font-weight:700;font-variant-numeric:tabular-nums;margin-bottom:16px}
.ld-step h3{font-size:17px;line-height:1.5;margin-bottom:8px}
.ld-step p{font-size:14px;line-height:1.8;color:var(--ink-500)}

/* FAQ */
.ld-faq{max-width:880px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.ld-faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:2px 22px;box-shadow:var(--shadow-sm)}
.ld-faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0;font-size:17px;font-weight:700;color:var(--ink-900);cursor:pointer;list-style:none}
.ld-faq-q::-webkit-details-marker{display:none}
.ld-faq-q::marker{content:""}
.ld-faq-icon{position:relative;flex:0 0 auto;width:18px;height:18px}
.ld-faq-icon::before,.ld-faq-icon::after{content:"";position:absolute;background:var(--brand-600);border-radius:2px}
.ld-faq-icon::before{left:0;top:8px;width:18px;height:2px}
.ld-faq-icon::after{left:8px;top:0;width:2px;height:18px;transition:transform .22s ease,opacity .22s ease}
.ld-faq-item[open] .ld-faq-icon::after{transform:rotate(90deg);opacity:0}
.ld-faq-a{border-top:1px solid var(--line);padding:16px 0 20px;font-size:15px;line-height:1.85;color:var(--ink-700)}

/* CTA 带 */
.ld-cta-band{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;background:var(--brand-50);border-radius:18px;padding:40px}
.ld-cta-band h2{font-size:26px;line-height:1.35;margin-bottom:8px}
.ld-cta-band p{font-size:15px;color:var(--ink-500);max-width:560px}
.ld-cta-actions{display:flex;gap:14px;flex-wrap:wrap;flex:0 0 auto}
.ld-copy-hint{font-size:13px;color:var(--accent-teal);font-weight:600;margin-top:10px;min-height:18px}

/* 页脚 */
.ld-footer{background:var(--brand-700);color:rgba(255,255,255,.88);padding:64px 0 0;margin-top:var(--space-section)}
.ld-footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.ld-footer h4{color:#fff;font-size:16px;margin-bottom:16px;font-weight:700}
.ld-footer .ld-logo{color:#fff}
.ld-footer .ld-logo:hover{color:#fff}
.ld-footer .ld-logo-text{color:#fff}
.ld-footer .ld-logo-mark{color:#fff}
.ld-footer .ld-logo-text small{color:rgba(255,255,255,.72)}
.ld-footer-about{font-size:14px;line-height:1.9;color:rgba(255,255,255,.72);margin-top:16px;max-width:340px}
.ld-footer-list li{margin-bottom:10px}
.ld-footer-list a{font-size:14.5px;color:rgba(255,255,255,.88)}
.ld-footer-list a:hover{color:#fff;text-decoration:underline}
.ld-footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.16);padding:22px 0;font-size:13px;color:rgba(255,255,255,.66)}

/* ============ 响应式 ============ */
@media screen and (max-width:1023px){
  .ld-container{padding:0 24px}
  .ld-nav{display:none}
  .ld-nav-cta{display:none}
  .ld-menu-btn{display:inline-flex}
  .ld-hero{padding:44px 0 64px}
  .ld-hero-grid{grid-template-columns:1fr;gap:34px}
  .ld-hero-media > img{aspect-ratio:16/10}
  .ld-hero-card{position:static;width:100%;margin-top:16px}
  .ld-h1{font-size:32px}
  .ld-h2{font-size:26px}
  .ld-card-grid{grid-template-columns:repeat(2,1fr)}
  .ld-index-layout{grid-template-columns:1fr;gap:24px}
  .ld-index-nav{position:static}
  .ld-steps{grid-template-columns:repeat(2,1fr)}
  .ld-footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .ld-cta-band{padding:32px}
  :root{--space-section:56px}
}
@media screen and (max-width:639px){
  .ld-container{padding:0 16px}
  body{font-size:15.5px}
  .ld-h1{font-size:30px;margin:14px 0 16px}
  .ld-h2{font-size:24px}
  .ld-card-grid{grid-template-columns:1fr}
  .ld-scene-grid{grid-template-columns:1fr}
  .ld-scene{grid-template-columns:96px 1fr;gap:14px}
  .ld-steps{grid-template-columns:1fr}
  .ld-stats{gap:26px}
  .ld-stat-num{font-size:23px}
  .ld-hero-actions .ld-btn{width:100%}
  .ld-index-row{grid-template-columns:34px 1fr;gap:12px;padding:18px 4px}
  .ld-index-meta{grid-column:1/-1;padding-left:46px;justify-content:flex-start}
  .ld-footer-grid{grid-template-columns:1fr}
  .ld-cta-band{padding:26px 22px}
  .ld-cta-band h2{font-size:22px}
  .ld-cta-actions{width:100%}
  .ld-cta-actions .ld-btn{width:100%}
  .ld-faq-item{padding:2px 16px}
  .ld-faq-q{font-size:16px;padding:16px 0}
  :root{--space-section:48px}
}