/* roulang page: index */
:root{
  --bb-brand-900:#0B3A2E;
  --bb-brand-700:#12604A;
  --bb-brand-500:#1E8A6B;
  --bb-brand-50:#EAF4F0;
  --bb-accent-500:#E39A2B;
  --bb-accent-100:#FDF1DD;
  --bb-ink-900:#14201C;
  --bb-ink-600:#4A5A54;
  --bb-line:#E2E0D8;
  --bb-bg:#F7F5EF;
  --bb-surface:#FFFFFF;
  --bb-r-card:14px;
  --bb-r-btn:10px;
  --bb-r-input:10px;
  --bb-shadow-sm:0 1px 2px rgba(20,32,28,.05);
  --bb-shadow-md:0 6px 18px rgba(11,58,46,.08);
  --bb-shadow-lg:0 16px 36px rgba(11,58,46,.12);
  --bb-font:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --bb-font-num:"SF Mono","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --sidebar-w:248px;
  --bs-primary:#12604A;
  --bs-link-color:#12604A;
  --bs-link-hover-color:#1E8A6B;
  --bs-body-color:#14201C;
  --bs-body-bg:#F7F5EF;
  --bs-border-color:#E2E0D8;
  --bs-border-radius:14px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--bb-font);
  font-size:16.5px;
  line-height:1.85;
  color:var(--bb-ink-900);
  background:var(--bb-bg);
  text-align:left;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--bb-brand-700);text-decoration:none;text-underline-offset:3px;transition:color .18s ease}
a:hover{color:var(--bb-brand-500);text-decoration:underline}
h1,h2,h3,h4{margin:1.6em 0 .6em;line-height:1.35;font-weight:700;color:var(--bb-ink-900)}
h1{font-size:36px;line-height:1.28;margin-top:0}
h2{font-size:26px}
h3{font-size:19px;line-height:1.45}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.2em}
button,input,select,textarea{font-family:inherit;font-size:inherit}
:focus-visible{outline:2px solid var(--bb-accent-500);outline-offset:2px;border-radius:4px}
.bb-num{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums}

/* 容器 */
.bb-container{max-width:1200px;margin:0 auto;padding:0 32px;width:100%}

/* 左侧 App Shell */
.bb-sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-w);
  background:var(--bb-brand-900);
  border-right:1px solid rgba(226,224,216,.16);
  display:flex;flex-direction:column;
  padding:22px 16px 18px;
  z-index:1040;transition:width .22s ease;
  overflow-y:auto;
}
.bb-logo{display:flex;align-items:center;gap:10px;padding:6px 8px 22px;color:#fff}
.bb-logo:hover{color:#fff;text-decoration:none}
.bb-logo-mark{
  position:relative;width:30px;height:30px;flex:0 0 30px;border-radius:50%;
  background:var(--bb-accent-500);
}
.bb-logo-mark::before{
  content:"";position:absolute;inset:6px;border-radius:50%;
  border:2px solid rgba(11,58,46,.85);border-right-color:transparent;border-bottom-color:transparent;
  transform:rotate(-35deg);
}
.bb-logo-text{font-weight:700;font-size:17px;letter-spacing:.2px;white-space:nowrap;line-height:1.2}
.bb-logo-sub{display:block;font-size:11.5px;font-weight:400;color:rgba(255,255,255,.55);letter-spacing:.6px}
.bb-nav{display:flex;flex-direction:column;gap:4px;margin-top:4px}
.bb-nav-label{
  font-size:11.5px;letter-spacing:1.4px;color:rgba(255,255,255,.42);
  padding:14px 10px 6px;text-transform:uppercase;
}
.bb-nav-link{
  position:relative;display:flex;align-items:center;gap:11px;
  padding:11px 12px;border-radius:10px;
  color:rgba(255,255,255,.76);font-size:15px;font-weight:500;
  transition:background .18s ease,color .18s ease;
}
.bb-nav-link i{width:18px;text-align:center;font-size:14.5px;color:rgba(255,255,255,.55)}
.bb-nav-link:hover{background:rgba(255,255,255,.07);color:#fff;text-decoration:none}
.bb-nav-link:hover i{color:var(--bb-accent-500)}
.bb-nav-link.active{background:rgba(255,255,255,.1);color:#fff}
.bb-nav-link.active i{color:var(--bb-accent-500)}
.bb-nav-link.active::before{
  content:"";position:absolute;left:-16px;top:9px;bottom:9px;width:3px;
  background:var(--bb-accent-500);border-radius:0 3px 3px 0;
}
.bb-side-foot{margin-top:auto;padding-top:20px;border-top:1px solid rgba(226,224,216,.16)}
.bb-side-note{font-size:12.5px;line-height:1.7;color:rgba(255,255,255,.5);margin:0 0 12px;padding:0 4px}
.bb-side-cta{
  display:flex;align-items:center;justify-content:center;gap:8px;width:100%;
  background:var(--bb-accent-500);color:#2A1A02;font-weight:700;font-size:15px;
  padding:12px 14px;border-radius:var(--bb-r-btn);border:0;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
}
.bb-side-cta:hover{background:#D98F1E;color:#2A1A02;text-decoration:none;transform:translateY(-1px);box-shadow:var(--bb-shadow-md)}
.bb-collapse-btn{
  position:absolute;top:26px;right:-13px;width:26px;height:26px;border-radius:50%;
  border:1px solid var(--bb-line);background:var(--bb-surface);color:var(--bb-brand-700);
  display:none;align-items:center;justify-content:center;font-size:11px;cursor:pointer;
  box-shadow:var(--bb-shadow-sm);z-index:5;
}
.bb-collapse-btn:hover{color:var(--bb-accent-500)}

body.bb-collapsed{--sidebar-w:76px}
body.bb-collapsed .bb-logo-text,
body.bb-collapsed .bb-nav-link span,
body.bb-collapsed .bb-nav-label,
body.bb-collapsed .bb-side-note,
body.bb-collapsed .bb-side-cta span,
body.bb-collapsed .bb-side-foot .bb-side-note{display:none}
body.bb-collapsed .bb-nav-link{justify-content:center;padding:11px 0}
body.bb-collapsed .bb-side-cta{justify-content:center;padding:12px 0}

/* 主内容 */
.bb-main{margin-left:var(--sidebar-w);transition:margin-left .22s ease;min-height:100vh;display:flex;flex-direction:column}
.bb-main-inner{flex:1 0 auto}

/* 移动端顶栏 */
.bb-mobilebar{
  display:none;position:fixed;top:0;left:0;right:0;height:60px;z-index:1050;
  background:var(--bb-brand-900);align-items:center;justify-content:space-between;
  padding:0 16px;box-shadow:0 2px 12px rgba(11,58,46,.22);
}
.bb-mobilebar .bb-logo{padding:0}
.bb-burger{
  width:42px;height:42px;border-radius:10px;border:1px solid rgba(255,255,255,.2);
  background:transparent;color:#fff;font-size:17px;display:flex;align-items:center;justify-content:center;
}
.bb-burger:hover{background:rgba(255,255,255,.1)}
.bb-offcanvas{background:var(--bb-brand-900);color:#fff;width:290px}
.bb-offcanvas .offcanvas-header{border-bottom:1px solid rgba(226,224,216,.16);padding:18px 20px}
.bb-offcanvas .offcanvas-body{padding:16px 16px 22px;display:flex;flex-direction:column}
.bb-offcanvas .btn-close{filter:invert(1) grayscale(1);opacity:.75}

/* 区块 */
.bb-section{padding:96px 0}
.bb-section.tight{padding:72px 0}
.bb-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px}
.bb-section-head .bb-title-group{display:flex;align-items:flex-start;gap:14px}
.bb-bar{width:8px;height:26px;border-radius:3px;background:var(--bb-brand-700);flex:0 0 8px;margin-top:6px}
.bb-section-head h2{margin:0;font-size:26px}
.bb-section-head .bb-sub{margin:6px 0 0;font-size:14.5px;color:var(--bb-ink-600)}
.bb-more{font-size:14.5px;font-weight:600;white-space:nowrap}
.bb-more i{font-size:12px;margin-left:4px}

/* Hero */
.bb-hero{
  position:relative;padding:76px 0 64px;
  background:
    linear-gradient(180deg,rgba(234,244,240,.85) 0%,rgba(247,245,239,1) 78%),
    url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  border-bottom:1px solid var(--bb-line);
}
.bb-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--bb-accent-100);color:#7A4E08;
  font-size:13.5px;font-weight:600;letter-spacing:.3px;
  padding:6px 14px;border-radius:999px;margin-bottom:20px;
}
.bb-eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--bb-accent-500)}
.bb-hero h1{font-size:36px;line-height:1.28;margin-bottom:16px;max-width:14em}
.bb-hero-sub{font-size:17px;line-height:1.8;color:var(--bb-ink-600);max-width:30em;margin-bottom:26px}
.bb-hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.bb-hero-figure{
  margin:0;border-radius:var(--bb-r-card);overflow:hidden;
  box-shadow:var(--bb-shadow-lg);border:1px solid var(--bb-line);background:var(--bb-surface);
}
.bb-hero-figure img{width:100%;aspect-ratio:16/11;object-fit:cover}
.bb-hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  margin-top:48px;background:var(--bb-surface);
  border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  box-shadow:var(--bb-shadow-sm);overflow:hidden;
}
.bb-hero-stat{padding:20px 22px;border-left:1px solid var(--bb-line)}
.bb-hero-stat:first-child{border-left:0}
.bb-hero-stat b{display:block;font-family:var(--bb-font-num);font-size:24px;font-weight:700;color:var(--bb-brand-900);font-variant-numeric:tabular-nums}
.bb-hero-stat span{font-size:13.5px;color:var(--bb-ink-600)}

/* 按钮 */
.bb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--bb-r-btn);
  font-size:15.5px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.bb-btn:hover{text-decoration:none;transform:translateY(-1px)}
.bb-btn:active{transform:translateY(0)}
.bb-btn-primary{background:var(--bb-accent-500);color:#2A1A02;box-shadow:var(--bb-shadow-sm)}
.bb-btn-primary:hover{background:#D98F1E;color:#2A1A02;box-shadow:var(--bb-shadow-md)}
.bb-btn-solid{background:var(--bb-brand-700);color:#fff}
.bb-btn-solid:hover{background:var(--bb-brand-900);color:#fff;box-shadow:var(--bb-shadow-md)}
.bb-btn-ghost{background:transparent;color:var(--bb-brand-700);border-color:var(--bb-brand-500)}
.bb-btn-ghost:hover{background:var(--bb-brand-50);color:var(--bb-brand-900);border-color:var(--bb-brand-700)}
.bb-btn-block{width:100%}

/* 徽章 / 标签 */
.bb-badge{
  display:inline-flex;align-items:center;gap:5px;
  background:var(--bb-brand-50);color:var(--bb-brand-700);
  font-size:12.5px;font-weight:600;padding:4px 11px;border-radius:999px;
}
.bb-badge.amber{background:var(--bb-accent-100);color:#7A4E08}

/* 品牌主张 */
.bb-claim{background:var(--bb-surface);border-top:1px solid var(--bb-line);border-bottom:1px solid var(--bb-line)}
.bb-claim h2{font-size:26px;margin-top:0}
.bb-claim-lead{color:var(--bb-ink-600);font-size:15.5px}
.bb-points{display:flex;flex-direction:column;gap:22px}
.bb-point{display:flex;gap:18px;align-items:flex-start}
.bb-point-no{
  flex:0 0 44px;width:44px;height:44px;border-radius:12px;
  background:var(--bb-brand-50);color:var(--bb-brand-700);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--bb-font-num);font-weight:700;font-size:15px;
}
.bb-point h3{margin:2px 0 6px;font-size:18px}
.bb-point p{margin:0;font-size:15px;line-height:1.8;color:var(--bb-ink-600)}

/* 数据 band */
.bb-band{
  background:var(--bb-brand-900);color:#fff;position:relative;overflow:hidden;
  padding:72px 0;
}
.bb-band::after{
  content:"";position:absolute;inset:0;
  background:url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  opacity:.14;pointer-events:none;
}
.bb-band > .bb-container{position:relative;z-index:2}
.bb-band h2{color:#fff;margin-top:0}
.bb-band .bb-bar{background:var(--bb-accent-500)}
.bb-band p.bb-band-lead{color:rgba(255,255,255,.72);max-width:52em}
.bb-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.bb-metric{
  background:rgba(255,255,255,.06);border:1px solid rgba(226,224,216,.18);
  border-radius:var(--bb-r-card);padding:24px 22px;transition:background .2s ease,transform .2s ease;
}
.bb-metric:hover{background:rgba(255,255,255,.1);transform:translateY(-2px)}
.bb-metric b{display:block;font-family:var(--bb-font-num);font-size:28px;color:var(--bb-accent-500);font-variant-numeric:tabular-nums;line-height:1.2}
.bb-metric strong{display:block;margin:8px 0 6px;font-size:16.5px;color:#fff}
.bb-metric span{font-size:14px;color:rgba(255,255,255,.7);line-height:1.75}

/* 精选卡 */
.bb-card{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  overflow:hidden;box-shadow:var(--bb-shadow-sm);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
  height:100%;display:flex;flex-direction:column;
}
.bb-card:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-lg)}
.bb-card-img{width:100%;aspect-ratio:16/9;object-fit:cover}
.bb-card-body{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1 1 auto}
.bb-card-body h3{margin:12px 0 8px;font-size:18.5px}
.bb-card-body h3 a{color:var(--bb-ink-900)}
.bb-card-body h3 a:hover{color:var(--bb-brand-700);text-decoration:none}
.bb-card-body p{margin:0 0 16px;font-size:15px;line-height:1.8;color:var(--bb-ink-600)}
.bb-card-meta{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:13.5px;color:var(--bb-ink-600)}
.bb-feature{display:grid;grid-template-columns:5fr 7fr;gap:0;background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);overflow:hidden;box-shadow:var(--bb-shadow-sm);transition:box-shadow .2s ease,border-color .2s ease}
.bb-feature:hover{box-shadow:var(--bb-shadow-lg);border-color:var(--bb-brand-500)}
.bb-feature-img{width:100%;height:100%;min-height:280px;object-fit:cover}
.bb-feature-body{padding:34px 34px 32px;display:flex;flex-direction:column;justify-content:center}
.bb-feature-body h3{margin:14px 0 12px;font-size:23px;line-height:1.4}
.bb-feature-body h3 a{color:var(--bb-ink-900)}
.bb-feature-body h3 a:hover{color:var(--bb-brand-700);text-decoration:none}
.bb-feature-body p{font-size:15.5px;color:var(--bb-ink-600);margin-bottom:20px}

/* 消息列表 */
.bb-news{border-top:1px solid var(--bb-line)}
.bb-news-row{
  display:grid;grid-template-columns:120px 1fr auto;gap:22px;align-items:center;
  padding:20px 16px;border-bottom:1px solid var(--bb-line);
  transition:background .18s ease;
}
.bb-news-row:hover{background:var(--bb-brand-50)}
.bb-news-thumb{display:block;border-radius:10px;overflow:hidden;border:1px solid var(--bb-line)}
.bb-news-thumb img{width:120px;height:80px;object-fit:cover}
.bb-news-main h3{margin:0 0 6px;font-size:17.5px;line-height:1.5}
.bb-news-main h3 a{color:var(--bb-ink-900)}
.bb-news-main h3 a:hover{color:var(--bb-brand-700);text-decoration:none}
.bb-news-main p{margin:0;font-size:14.5px;color:var(--bb-ink-600);display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.bb-news-side{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.bb-news-side time{font-family:var(--bb-font-num);font-size:13.5px;color:var(--bb-ink-600);font-variant-numeric:tabular-nums}
.bb-empty{
  border:1px dashed var(--bb-line);border-radius:var(--bb-r-card);
  background:var(--bb-surface);padding:44px 24px;text-align:center;color:var(--bb-ink-600);
}
.bb-empty i{display:block;font-size:26px;color:var(--bb-brand-500);margin-bottom:10px}
.bb-empty a{font-weight:600}

/* 时间线 */
.bb-timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:10px}
.bb-tl-item{position:relative;padding-top:26px;border-top:2px solid var(--bb-line)}
.bb-tl-item::before{
  content:"";position:absolute;top:-7px;left:0;width:12px;height:12px;border-radius:50%;
  background:var(--bb-accent-500);border:3px solid var(--bb-bg);
}
.bb-tl-year{font-family:var(--bb-font-num);font-size:14px;color:var(--bb-brand-700);font-weight:700;letter-spacing:.5px}
.bb-tl-item h3{margin:8px 0 6px;font-size:17.5px}
.bb-tl-item p{margin:0;font-size:14.5px;color:var(--bb-ink-600)}
.bb-story{
  display:grid;grid-template-columns:5fr 7fr;gap:40px;align-items:center;
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  overflow:hidden;box-shadow:var(--bb-shadow-sm);
}
.bb-story img{width:100%;height:100%;min-height:320px;object-fit:cover}
.bb-story-body{padding:36px 38px 38px}

/* 信任 */
.bb-proof{background:var(--bb-surface);border-top:1px solid var(--bb-line);border-bottom:1px solid var(--bb-line)}
.bb-proof-nums{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:44px}
.bb-proof-num{border-left:3px solid var(--bb-brand-50);padding-left:16px}
.bb-proof-num b{display:block;font-family:var(--bb-font-num);font-size:27px;color:var(--bb-brand-900);font-variant-numeric:tabular-nums;line-height:1.25}
.bb-proof-num span{font-size:14px;color:var(--bb-ink-600)}
.bb-quotes{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.bb-quote{
  background:var(--bb-bg);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  padding:26px 26px 22px;
}
.bb-quote p{margin:0 0 14px;font-size:15.5px;line-height:1.85}
.bb-quote footer{font-size:13.5px;color:var(--bb-ink-600);font-family:var(--bb-font-num)}
.bb-partners{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:34px}
.bb-partner{
  border:1px solid var(--bb-line);border-radius:10px;padding:10px 18px;
  font-size:13.5px;color:var(--bb-ink-600);background:var(--bb-bg);letter-spacing:.4px;
}

/* FAQ */
.bb-faq{max-width:920px}
.bb-faq details{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  margin-bottom:12px;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;
}
.bb-faq details[open]{border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-sm)}
.bb-faq summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;font-size:16.5px;font-weight:600;color:var(--bb-ink-900);
}
.bb-faq summary::-webkit-details-marker{display:none}
.bb-faq summary .ind{
  flex:0 0 22px;width:22px;height:22px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--bb-brand-50);color:var(--bb-brand-700);font-size:14px;font-weight:700;
  transition:transform .2s ease,background .2s ease,color .2s ease;
}
.bb-faq details[open] summary .ind{background:var(--bb-accent-500);color:#2A1A02;transform:rotate(45deg)}
.bb-faq .bb-faq-body{padding:0 22px 20px;background:var(--bb-brand-50);margin:0 0 0 0;border-top:1px solid var(--bb-line)}
.bb-faq .bb-faq-body p{margin:16px 0 0;font-size:15px;line-height:1.85;color:var(--bb-ink-600)}

/* CTA */
.bb-cta{background:var(--bb-brand-900);color:#fff;padding:80px 0;position:relative;overflow:hidden}
.bb-cta::after{
  content:"";position:absolute;right:-80px;top:-80px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(227,154,43,.22),transparent 68%);
}
.bb-cta > .bb-container{position:relative;z-index:2}
.bb-cta h2{color:#fff;margin-top:0;font-size:28px}
.bb-cta p{color:rgba(255,255,255,.74);max-width:48em}
.bb-form{display:flex;gap:12px;margin-top:22px;max-width:520px}
.bb-form input{
  flex:1 1 auto;height:48px;padding:0 16px;border-radius:var(--bb-r-input);
  border:1px solid rgba(226,224,216,.28);background:rgba(255,255,255,.08);color:#fff;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.bb-form input::placeholder{color:rgba(255,255,255,.5)}
.bb-form input:focus{outline:none;border-color:var(--bb-accent-500);background:rgba(255,255,255,.12);box-shadow:0 0 0 3px rgba(227,154,43,.25)}
.bb-form button{height:48px;flex:0 0 auto}
.bb-form-tip{margin-top:12px;font-size:13.5px;color:rgba(255,255,255,.55)}
.bb-cta-links{display:flex;flex-wrap:wrap;gap:20px;margin-top:26px;font-size:14.5px}
.bb-cta-links a{color:rgba(255,255,255,.82)}
.bb-cta-links a:hover{color:#fff}

/* 页脚 */
.bb-footer{background:var(--bb-brand-900);color:rgba(255,255,255,.72);padding:64px 0 0;margin-top:0}
.bb-footer h3{color:#fff;font-size:15.5px;margin:0 0 16px;letter-spacing:.4px}
.bb-footer a{color:rgba(255,255,255,.72)}
.bb-footer a:hover{color:#fff;text-decoration:none}
.bb-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:44px}
.bb-footer-brand{display:flex;align-items:center;gap:10px;color:#fff;margin-bottom:14px}
.bb-footer-brand .bb-logo-mark{width:28px;height:28px;flex:0 0 28px}
.bb-footer-brand strong{font-size:17px}
.bb-footer-desc{font-size:14px;line-height:1.8;margin:0 0 14px;color:rgba(255,255,255,.66)}
.bb-footer ul{list-style:none;padding:0;margin:0}
.bb-footer li{margin-bottom:10px;font-size:14.5px}
.bb-footer-line{border-top:1px solid rgba(226,224,216,.18);padding:20px 0;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13.5px;color:rgba(255,255,255,.55)}
.bb-footer-line .bb-num{font-family:var(--bb-font-num)}

/* 骨架 */
.bb-skeleton{background:var(--bb-brand-50);border-radius:10px;height:16px;animation:bbPulse 1.4s ease-in-out infinite}
@keyframes bbPulse{0%,100%{opacity:1}50%{opacity:.55}}

/* 响应式 */
@media (min-width:1280px){
  .bb-collapse-btn{display:flex}
}
@media (max-width:1199.98px){
  h1{font-size:32px}
  .bb-hero h1{font-size:32px}
}
@media (max-width:991.98px){
  .bb-sidebar{display:none}
  .bb-mobilebar{display:flex}
  .bb-main{margin-left:0;padding-top:60px}
  .bb-section{padding:64px 0}
  .bb-section.tight{padding:52px 0}
  .bb-hero{padding:52px 0 46px}
  .bb-hero-figure{margin-top:32px}
  .bb-hero-stats{grid-template-columns:repeat(2,1fr);margin-top:32px}
  .bb-hero-stat:nth-child(3){border-left:0;border-top:1px solid var(--bb-line)}
  .bb-hero-stat:nth-child(4){border-top:1px solid var(--bb-line)}
  .bb-feature{grid-template-columns:1fr}
  .bb-feature-img{min-height:220px}
  .bb-feature-body{padding:26px 24px}
  .bb-story{grid-template-columns:1fr}
  .bb-story img{min-height:220px}
  .bb-story-body{padding:26px 24px 30px}
  .bb-metrics{grid-template-columns:1fr;gap:16px}
  .bb-timeline{grid-template-columns:1fr;gap:18px}
  .bb-proof-nums{grid-template-columns:repeat(2,1fr)}
  .bb-quotes{grid-template-columns:1fr}
  .bb-footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:767.98px){
  .bb-container{padding:0 20px}
  h1{font-size:26px}
  h2,.bb-section-head h2,.bb-claim h2{font-size:21px}
  .bb-hero h1{font-size:26px}
  body{font-size:16px}
  .bb-section{padding:52px 0}
  .bb-section-head{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:26px}
  .bb-card-body p{-webkit-line-clamp:2;display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden}
  .bb-news-row{grid-template-columns:96px 1fr;gap:16px;padding:16px 12px}
  .bb-news-thumb img{width:96px;height:68px}
  .bb-news-side{grid-column:1 / -1;flex-direction:row;align-items:center;justify-content:flex-start;gap:12px}
  .bb-news-main p{display:none}
  .bb-form{flex-direction:column}
  .bb-form button{width:100%}
  .bb-proof-nums{grid-template-columns:1fr 1fr;gap:16px}
  .bb-footer-grid{grid-template-columns:1fr;gap:26px}
}
@media (max-width:520px){
  .bb-container{padding:0 16px}
  .bb-hero-actions .bb-btn{width:100%}
  .bb-hero-stats{grid-template-columns:1fr}
  .bb-hero-stat{border-left:0;border-top:1px solid var(--bb-line)}
  .bb-hero-stat:first-child{border-top:0}
  .bb-proof-nums{grid-template-columns:1fr}
  .bb-footer-line{flex-direction:column;gap:8px}
  .bb-feature-body h3{font-size:20px}
}

/* roulang page: article */
:root{
  --bb-brand-900:#0B3A2E;
  --bb-brand-700:#12604A;
  --bb-brand-500:#1E8A6B;
  --bb-brand-50:#EAF4F0;
  --bb-accent-500:#E39A2B;
  --bb-accent-100:#FDF1DD;
  --bb-ink-900:#14201C;
  --bb-ink-600:#4A5A54;
  --bb-line:#E2E0D8;
  --bb-bg:#F7F5EF;
  --bb-surface:#FFFFFF;
  --bb-r-card:14px;
  --bb-r-btn:10px;
  --bb-r-input:10px;
  --bb-sh-sm:0 1px 2px rgba(20,32,28,.05);
  --bb-sh-md:0 6px 18px rgba(11,58,46,.08);
  --bb-sh-lg:0 16px 36px rgba(11,58,46,.12);
  --bb-sb:248px;
  --bb-font:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --bb-font-num:"SF Mono","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --bs-primary:#12604A;
  --bs-link-color:#12604A;
  --bs-link-hover-color:#0B3A2E;
  --bs-body-color:#14201C;
  --bs-body-bg:#F7F5EF;
  --bs-border-color:#E2E0D8;
  --bs-border-radius:14px;
  --bs-font-sans-serif:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--bb-font);
  font-size:16.5px;
  line-height:1.85;
  color:var(--bb-ink-900);
  background:var(--bb-bg);
  text-align:left;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--bb-brand-700);text-decoration:none;transition:color .18s ease;}
a:hover{color:var(--bb-brand-900);text-decoration:underline;text-underline-offset:3px;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--bb-accent-500);outline-offset:2px;border-radius:6px;}
.num{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;letter-spacing:.01em;}

/* ---------- App shell ---------- */
.bb-sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--bb-sb);
  background:var(--bb-brand-900);
  display:flex;flex-direction:column;
  padding:24px 16px;
  z-index:1045;
  overflow-y:auto;
  border-right:1px solid rgba(255,255,255,.06);
  transition:width .25s ease;
}
.bb-brand{display:flex;align-items:center;gap:10px;padding:4px 8px 22px;text-decoration:none;}
.bb-brand:hover{text-decoration:none;}
.bb-brand-mark{
  width:34px;height:34px;flex:0 0 34px;border-radius:11px;
  background:linear-gradient(150deg,var(--bb-brand-500),var(--bb-brand-700));
  position:relative;display:inline-flex;align-items:center;justify-content:center;
}
.bb-brand-mark::after{
  content:"";width:16px;height:16px;border-radius:50%;
  border:2px solid rgba(255,255,255,.85);
  border-bottom-color:var(--bb-accent-500);
}
.bb-brand-text{color:#fff;font-weight:700;font-size:17px;letter-spacing:.02em;line-height:1.2;white-space:nowrap;}
.bb-nav{display:flex;flex-direction:column;gap:4px;padding-top:6px;}
.bb-nav-label{
  color:rgba(255,255,255,.42);font-size:12px;letter-spacing:.14em;
  padding:16px 10px 8px;text-transform:uppercase;white-space:nowrap;
}
.bb-nav-link{
  display:flex;align-items:center;gap:11px;
  color:rgba(255,255,255,.76);font-size:15px;
  padding:11px 12px;border-radius:10px;position:relative;
  transition:background .18s ease,color .18s ease;
}
.bb-nav-link i{width:18px;text-align:center;font-size:15px;flex:0 0 18px;}
.bb-nav-link:hover{background:rgba(255,255,255,.07);color:#fff;text-decoration:none;}
.bb-nav-link.active{background:rgba(255,255,255,.08);color:#fff;}
.bb-nav-link.active::before{
  content:"";position:absolute;left:-16px;top:8px;bottom:8px;width:3px;
  background:var(--bb-accent-500);border-radius:0 3px 3px 0;
}
.bb-side-sep{height:1px;background:rgba(255,255,255,.08);margin:20px 8px;}
.bb-side-foot{margin-top:auto;padding-top:18px;}
.bb-collapse{
  display:none;align-items:center;justify-content:center;gap:8px;
  width:100%;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);
  color:rgba(255,255,255,.72);border-radius:10px;font-size:13px;padding:8px;
  cursor:pointer;margin-bottom:12px;
}
.bb-collapse:hover{background:rgba(255,255,255,.12);color:#fff;}
.bb-topbar{
  position:fixed;top:0;left:0;right:0;height:60px;z-index:1046;
  background:var(--bb-brand-900);display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;
}
.bb-burger{
  width:42px;height:42px;border-radius:10px;border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.06);color:#fff;font-size:17px;cursor:pointer;
}
.bb-burger:hover{background:rgba(255,255,255,.14);}
.bb-drawer{background:var(--bb-brand-900);color:#fff;width:280px;}
.bb-drawer .offcanvas-header{border-bottom:1px solid rgba(255,255,255,.08);padding:16px;}
.bb-drawer .offcanvas-body{padding:14px 16px;display:flex;flex-direction:column;}
.bb-drawer .bb-nav-link.active::before{left:-16px;}
.offcanvas-backdrop.show{opacity:.45;}

/* ---------- Layout ---------- */
.bb-main{
  margin-left:var(--bb-sb);
  padding:28px 32px 0;
  transition:margin-left .25s ease;
}
.bb-container{max-width:1200px;margin:0 auto;}
.bb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:600;line-height:1;
  padding:13px 22px;border-radius:var(--bb-r-btn);
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease,background .18s ease,box-shadow .18s ease,color .18s ease,border-color .18s ease;
}
.bb-btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--bb-sh-md);}
.bb-btn:active{transform:translateY(0);box-shadow:var(--bb-sh-sm);}
.bb-btn-primary{background:var(--bb-brand-700);color:#fff;}
.bb-btn-primary:hover{background:var(--bb-brand-900);color:#fff;}
.bb-btn-accent{background:var(--bb-accent-500);color:#241a06;}
.bb-btn-accent:hover{background:#d18d21;color:#1a1204;}
.bb-btn-ghost{background:transparent;border-color:var(--bb-line);color:var(--bb-brand-900);}
.bb-btn-ghost:hover{border-color:var(--bb-brand-500);background:var(--bb-brand-50);color:var(--bb-brand-900);}
.bb-btn-block{width:100%;}
.bb-badge{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--bb-accent-100);color:#8a5a10;
  font-size:12.5px;font-weight:600;letter-spacing:.02em;
  padding:5px 12px;border-radius:999px;line-height:1.5;
}
.bb-tag{
  display:inline-block;font-size:13px;color:var(--bb-ink-600);
  background:var(--bb-surface);border:1px solid var(--bb-line);
  padding:5px 12px;border-radius:999px;margin:0 8px 8px 0;
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.bb-tag:hover{border-color:var(--bb-brand-500);color:var(--bb-brand-700);background:var(--bb-brand-50);text-decoration:none;}

/* ---------- Breadcrumb ---------- */
.bb-crumb{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px;
  font-size:13.5px;color:var(--bb-ink-600);padding:6px 0 18px;
}
.bb-crumb i{font-size:10px;color:#b6b3a8;}
.bb-crumb a{color:var(--bb-ink-600);}
.bb-crumb a:hover{color:var(--bb-brand-700);}
.bb-crumb-cur{color:var(--bb-ink-900);max-width:520px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ---------- Article head ---------- */
.bb-article-head{
  background:var(--bb-surface);
  border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);
  box-shadow:var(--bb-sh-sm);
  padding:34px 38px 30px;
  position:relative;
  overflow:hidden;
}
.bb-article-head::before{
  content:"";position:absolute;left:0;top:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--bb-brand-700),var(--bb-accent-500));
  opacity:.85;
}
.bb-article-head h1{
  font-size:36px;line-height:1.28;margin:14px 0 18px;font-weight:700;letter-spacing:-.01em;
}
.bb-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  font-size:13.5px;color:var(--bb-ink-600);
}
.bb-meta span{display:inline-flex;align-items:center;gap:7px;}
.bb-meta i{color:var(--bb-brand-500);font-size:13px;}
.bb-meta time{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;}
.bb-meta .bb-meta-div{width:1px;height:14px;background:var(--bb-line);display:inline-block;}

/* ---------- Article layout ---------- */
.bb-article-layout{
  display:grid;grid-template-columns:minmax(0,1fr) 220px;
  gap:48px;align-items:start;margin-top:32px;
}
.bb-article-body{
  background:var(--bb-surface);
  border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);
  box-shadow:var(--bb-sh-sm);
  padding:38px 40px;
  max-width:800px;
  font-size:16.5px;line-height:1.85;color:var(--bb-ink-900);
  overflow-wrap:break-word;
}
.bb-article-body > *:first-child{margin-top:0;}
.bb-article-body h2{
  font-size:26px;line-height:1.35;font-weight:700;
  margin:1.6em 0 .6em;padding-left:16px;position:relative;scroll-margin-top:96px;
}
.bb-article-body h2::before{
  content:"";position:absolute;left:0;top:.2em;width:8px;height:.78em;
  background:var(--bb-brand-700);border-radius:2px;
}
.bb-article-body h3{font-size:19px;line-height:1.45;font-weight:700;margin:1.4em 0 .5em;scroll-margin-top:96px;}
.bb-article-body h4{font-size:17px;font-weight:700;margin:1.2em 0 .4em;}
.bb-article-body p{margin:0 0 1em;}
.bb-article-body ul,.bb-article-body ol{margin:0 0 1em;padding-left:1.4em;}
.bb-article-body li{margin:.35em 0;}
.bb-article-body li::marker{color:var(--bb-accent-500);}
.bb-article-body blockquote{
  margin:1.3em 0;padding:16px 22px;
  border-left:3px solid var(--bb-accent-500);
  background:var(--bb-brand-50);
  border-radius:0 10px 10px 0;
  color:var(--bb-ink-600);
}
.bb-article-body blockquote p:last-child{margin-bottom:0;}
.bb-article-body img{
  max-width:100%;height:auto;border-radius:12px;
  box-shadow:var(--bb-sh-sm);margin:1.3em 0;object-fit:cover;
}
.bb-article-body figure{margin:1.3em 0;}
.bb-article-body figcaption{
  font-size:13.5px;color:var(--bb-ink-600);text-align:center;margin-top:10px;
}
.bb-article-body a{color:var(--bb-brand-700);text-decoration:underline;text-underline-offset:3px;}
.bb-article-body a:hover{color:var(--bb-brand-900);}
.bb-article-body strong{font-weight:700;}
.bb-article-body hr{border:0;border-top:1px solid var(--bb-line);margin:2em 0;}
.bb-article-body table{
  width:100%;border-collapse:collapse;margin:1.4em 0;font-size:15px;
  border:1px solid var(--bb-line);border-radius:10px;overflow:hidden;
}
.bb-article-body th,.bb-article-body td{
  padding:11px 14px;border-bottom:1px solid var(--bb-line);text-align:left;
}
.bb-article-body th{background:var(--bb-brand-50);font-weight:700;color:var(--bb-brand-900);}
.bb-article-body tr:last-child td{border-bottom:0;}

.bb-toc{
  position:sticky;top:88px;
  background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);box-shadow:var(--bb-sh-sm);
  padding:18px 18px 14px;font-size:13.5px;
}
.bb-toc-title{
  font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--bb-ink-600);
  text-transform:uppercase;margin-bottom:10px;padding-bottom:10px;
  border-bottom:1px solid var(--bb-line);
}
.bb-toc ol{list-style:none;margin:0;padding:0;counter-reset:toc;}
.bb-toc li{margin:0;}
.bb-toc a{
  display:block;color:var(--bb-ink-600);line-height:1.55;
  padding:7px 10px;border-left:2px solid transparent;border-radius:0 8px 8px 0;
  transition:color .18s ease,background .18s ease,border-color .18s ease;
  overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
}
.bb-toc a:hover{color:var(--bb-brand-700);background:var(--bb-brand-50);text-decoration:none;}
.bb-toc a.active{color:var(--bb-brand-900);font-weight:600;border-left-color:var(--bb-accent-500);background:var(--bb-brand-50);}

.bb-empty{
  text-align:center;padding:56px 20px;
}
.bb-empty i{font-size:40px;color:var(--bb-brand-500);opacity:.7;}
.bb-empty p{font-size:17px;color:var(--bb-ink-600);margin:16px 0 22px;}

/* ---------- Article foot ---------- */
.bb-article-foot{
  margin-top:26px;background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);padding:24px 30px;
  display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between;
  box-shadow:var(--bb-sh-sm);
}
.bb-article-foot .bb-tags{margin:0;max-width:640px;}
.bb-article-foot .bb-tag:last-child{margin-right:0;}
.bb-share{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--bb-ink-600);}
.bb-share button{
  width:40px;height:40px;border-radius:10px;border:1px solid var(--bb-line);
  background:var(--bb-surface);color:var(--bb-ink-600);cursor:pointer;
  transition:border-color .18s ease,color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.bb-share button:hover{border-color:var(--bb-brand-500);color:var(--bb-brand-700);transform:translateY(-2px);box-shadow:var(--bb-sh-md);}

/* ---------- Section ---------- */
.bb-section{margin-top:56px;}
.bb-sec-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:20px;
  margin-bottom:24px;
}
.bb-sec-title{display:flex;align-items:center;gap:14px;}
.bb-sec-title::before{
  content:"";width:8px;height:24px;border-radius:2px;background:var(--bb-brand-700);flex:0 0 8px;
}
.bb-sec-title h2{font-size:26px;line-height:1.35;font-weight:700;margin:0;}
.bb-sec-more{font-size:14px;color:var(--bb-brand-700);white-space:nowrap;}
.bb-sec-more i{font-size:11px;margin-left:6px;transition:transform .18s ease;}
.bb-sec-more:hover i{transform:translateX(3px);}

.bb-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.bb-card{
  background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);overflow:hidden;box-shadow:var(--bb-sh-sm);
  display:flex;flex-direction:column;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.bb-card:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-sh-lg);text-decoration:none;}
.bb-card-img{aspect-ratio:16/9;width:100%;object-fit:cover;background:var(--bb-brand-50);}
.bb-card-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1;}
.bb-card-body h3{font-size:19px;line-height:1.45;font-weight:700;margin:0;color:var(--bb-ink-900);}
.bb-card-body p{font-size:15px;line-height:1.8;color:var(--bb-ink-600);margin:0;}
.bb-card-meta{
  margin-top:auto;display:flex;align-items:center;justify-content:space-between;
  font-size:13.5px;color:var(--bb-ink-600);padding-top:8px;
}
.bb-card-meta .num{font-family:var(--bb-font-num);}

/* ---------- Pager ---------- */
.bb-pager{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:28px;}
.bb-pager a{
  display:flex;flex-direction:column;gap:8px;
  background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);padding:20px 24px;box-shadow:var(--bb-sh-sm);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.bb-pager a:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-sh-md);text-decoration:none;}
.bb-pager small{font-size:12.5px;color:var(--bb-ink-600);letter-spacing:.08em;}
.bb-pager strong{font-size:16.5px;color:var(--bb-ink-900);font-weight:700;line-height:1.5;}
.bb-pager .bb-pager-next{text-align:right;align-items:flex-end;}

/* ---------- CTA band ---------- */
.bb-cta{
  margin-top:56px;background:var(--bb-brand-900);border-radius:var(--bb-r-card);
  padding:52px 48px;position:relative;overflow:hidden;
  display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;
}
.bb-cta::after{
  content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;
  border-radius:50%;border:1px solid rgba(255,255,255,.12);
}
.bb-cta::before{
  content:"";position:absolute;right:40px;bottom:-90px;width:180px;height:180px;
  border-radius:50%;border:1px solid rgba(227,154,43,.28);
}
.bb-cta h2{color:#fff;font-size:26px;line-height:1.35;margin:0 0 12px;}
.bb-cta p{color:rgba(255,255,255,.72);font-size:15.5px;line-height:1.8;margin:0;}
.bb-sub-form{display:flex;gap:12px;position:relative;z-index:2;}
.bb-sub-form input{
  flex:1;height:48px;border-radius:var(--bb-r-input);
  border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.08);
  color:#fff;padding:0 16px;font-size:15px;font-family:inherit;
}
.bb-sub-form input::placeholder{color:rgba(255,255,255,.5);}
.bb-sub-form input:focus{outline:none;border-color:var(--bb-accent-500);box-shadow:0 0 0 3px rgba(227,154,43,.25);}
.bb-sub-form .bb-btn{height:48px;padding:0 22px;flex:0 0 auto;}
.bb-form-tip{font-size:13px;color:rgba(255,255,255,.5);margin-top:12px;position:relative;z-index:2;}

/* ---------- Footer ---------- */
.bb-footer{
  background:var(--bb-brand-900);color:rgba(255,255,255,.72);
  margin-top:72px;padding:56px 32px 0;
}
.bb-footer .bb-container{max-width:1200px;}
.bb-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;}
.bb-footer h3{font-size:15px;color:#fff;font-weight:700;margin:0 0 16px;}
.bb-footer p{font-size:14px;line-height:1.85;margin:0 0 12px;color:rgba(255,255,255,.72);}
.bb-footer ul{list-style:none;margin:0;padding:0;}
.bb-footer li{margin-bottom:10px;}
.bb-footer a{color:rgba(255,255,255,.72);font-size:14px;}
.bb-footer a:hover{color:#fff;text-decoration:none;}
.bb-footer .bb-brand{padding:0 0 16px;}
.bb-footer-bottom{
  margin-top:44px;border-top:1px solid rgba(255,255,255,.1);
  padding:20px 0 26px;display:flex;flex-wrap:wrap;gap:12px;
  align-items:center;justify-content:space-between;
  font-size:13.5px;color:rgba(255,255,255,.55);
}
.bb-footer-bottom .num{font-family:var(--bb-font-num);}

/* ---------- Responsive ---------- */
@media (min-width:1280px){
  body.bb-collapsed{--bb-sb:76px;}
  body.bb-collapsed .bb-brand-text,
  body.bb-collapsed .bb-nav-link span,
  body.bb-collapsed .bb-nav-label,
  body.bb-collapsed .bb-side-foot .bb-btn span{display:none;}
  body.bb-collapsed .bb-brand{justify-content:center;padding-left:0;padding-right:0;}
  body.bb-collapsed .bb-nav-link{justify-content:center;padding:12px 0;}
  body.bb-collapsed .bb-btn{padding:13px 0;}
  .bb-collapse{display:flex;}
}
@media (max-width:1199px){
  .bb-article-layout{grid-template-columns:minmax(0,1fr);gap:32px;}
  .bb-toc{display:none;}
  .bb-article-body{max-width:none;}
  .bb-grid-3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .bb-cta{grid-template-columns:1fr;padding:44px 36px;}
}
@media (max-width:991px){
  .bb-sidebar{display:none;}
  .bb-main{margin-left:0;padding:80px 20px 0;}
  .bb-article-head{padding:26px 22px 24px;}
  .bb-article-head h1{font-size:26px;}
  .bb-article-body{padding:26px 22px;}
  .bb-article-body h2{font-size:21px;}
  .bb-footer{padding:44px 20px 0;}
  .bb-footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
  .bb-section{margin-top:44px;}
  .bb-cta{margin-top:44px;padding:36px 26px;}
}
@media (max-width:767px){
  .bb-sec-head{flex-direction:column;align-items:flex-start;gap:10px;}
  .bb-grid-3{grid-template-columns:1fr;}
  .bb-article-foot{flex-direction:column;align-items:flex-start;padding:20px 22px;}
  .bb-crumb-cur{max-width:220px;}
  .bb-pager{grid-template-columns:1fr;}
  .bb-pager .bb-pager-next{text-align:left;align-items:flex-start;}
}
@media (max-width:575px){
  body{font-size:16px;}
  .bb-main{padding:74px 14px 0;}
  .bb-article-head h1{font-size:22px;}
  .bb-btn{width:100%;}
  .bb-sub-form{flex-direction:column;}
  .bb-sub-form .bb-btn{width:100%;}
  .bb-footer-grid{grid-template-columns:1fr;gap:24px;}
  .bb-crumb-cur{max-width:150px;}
}

/* roulang page: category1 */
:root{
  --bb-brand-900:#0B3A2E;
  --bb-brand-700:#12604A;
  --bb-brand-500:#1E8A6B;
  --bb-brand-50:#EAF4F0;
  --bb-accent-500:#E39A2B;
  --bb-accent-100:#FDF1DD;
  --bb-ink-900:#14201C;
  --bb-ink-600:#4A5A54;
  --bb-line:#E2E0D8;
  --bb-bg:#F7F5EF;
  --bb-surface:#FFFFFF;
  --bb-r-card:14px;
  --bb-r-btn:10px;
  --bb-r-input:10px;
  --bb-shadow-sm:0 1px 2px rgba(20,32,28,.05);
  --bb-shadow-md:0 6px 18px rgba(11,58,46,.08);
  --bb-shadow-lg:0 16px 36px rgba(11,58,46,.12);
  --bb-font:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --bb-font-num:"SF Mono","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --bb-side-w:248px;
  --bs-body-color:#14201C;
  --bs-body-bg:#F7F5EF;
  --bs-border-color:#E2E0D8;
  --bs-link-color:#12604A;
  --bs-link-hover-color:#1E8A6B;
  --bs-border-radius:10px;
  --bs-primary:#12604A;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--bb-font);
  font-size:16.5px;
  line-height:1.85;
  color:var(--bb-ink-900);
  background:var(--bb-bg);
  text-align:left;
  overflow-x:hidden;
}
img{max-width:100%;display:block;object-fit:cover}
a{color:var(--bb-brand-500);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--bb-brand-700);text-decoration:underline;text-underline-offset:3px}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;color:var(--bb-ink-900);font-weight:700}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--bb-accent-500);outline-offset:2px;border-radius:4px}
.bb-num{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums}
.bb-container{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}

/* ============ App Shell 侧栏 ============ */
.bb-side{
  position:fixed;top:0;left:0;bottom:0;width:var(--bb-side-w);
  background:var(--bb-brand-900);
  border-right:1px solid rgba(226,224,216,.10);
  display:flex;flex-direction:column;
  padding:20px 16px 18px;
  z-index:1042;
  transition:width .25s ease,padding .25s ease;
}
.bb-side-head{display:flex;align-items:center;justify-content:space-between;gap:6px}
.bb-logo{
  display:flex;align-items:center;gap:10px;
  color:#fff;font-weight:700;font-size:17px;line-height:1.15;
  padding:6px 8px;border-radius:10px;text-decoration:none;min-width:0;
}
.bb-logo:hover{color:#fff;text-decoration:none;background:rgba(255,255,255,.06)}
.bb-logo-mark{
  position:relative;flex:0 0 30px;width:30px;height:30px;border-radius:50%;
  border:2px solid var(--bb-accent-500);display:block;
}
.bb-logo-mark::before{
  content:"";position:absolute;left:50%;top:50%;width:12px;height:12px;
  border-radius:50%;background:var(--bb-accent-500);transform:translate(-50%,-50%);
}
.bb-logo-mark::after{
  content:"";position:absolute;inset:-6px;border-radius:50%;
  border:1px solid rgba(227,154,43,.45);
  border-right-color:transparent;border-bottom-color:transparent;
  transform:rotate(-28deg);
}
.bb-logo-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bb-collapse{
  flex:0 0 30px;width:30px;height:30px;border-radius:8px;border:0;
  background:rgba(255,255,255,.08);color:rgba(255,255,255,.78);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:background .2s,color .2s;
}
.bb-collapse:hover{background:rgba(255,255,255,.16);color:#fff}
.bb-nav{display:flex;flex-direction:column;gap:4px;margin-top:14px;flex:1;overflow-y:auto;overflow-x:hidden}
.bb-nav::-webkit-scrollbar{width:5px}
.bb-nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,.18);border-radius:3px}
.bb-nav-label{font-size:12px;letter-spacing:.14em;color:rgba(255,255,255,.42);padding:16px 10px 6px}
.bb-nav-link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 12px;border-radius:10px;font-size:15px;
  color:rgba(255,255,255,.80);text-decoration:none;
  transition:background .2s,color .2s;
}
.bb-nav-link i{width:18px;text-align:center;font-size:15px;color:rgba(255,255,255,.58);transition:color .2s}
.bb-nav-link:hover{background:rgba(255,255,255,.06);color:#fff;text-decoration:none}
.bb-nav-link.active{background:rgba(255,255,255,.08);color:#fff;font-weight:600}
.bb-nav-link.active i{color:var(--bb-accent-500)}
.bb-nav-link.active::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:3px;
  border-radius:2px;background:var(--bb-accent-500);
}
.bb-side-foot{padding-top:14px;border-top:1px solid rgba(255,255,255,.10);margin-top:12px}

/* ============ 顶部移动栏 ============ */
.bb-topbar{
  display:none;position:fixed;top:0;left:0;right:0;height:60px;
  background:var(--bb-brand-900);align-items:center;justify-content:space-between;
  padding:0 16px;z-index:1044;border-bottom:1px solid rgba(255,255,255,.08);
}
.bb-burger{
  width:40px;height:40px;border-radius:10px;border:1px solid rgba(255,255,255,.22);
  background:rgba(255,255,255,.06);color:#fff;font-size:17px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:background .2s;
}
.bb-burger:hover{background:rgba(255,255,255,.15)}
.bb-drawer{background:var(--bb-brand-900);color:#fff;width:290px;border-right:0}
.bb-drawer .offcanvas-header{border-bottom:1px solid rgba(255,255,255,.10);padding:16px 18px}
.bb-drawer .offcanvas-body{padding:14px 14px 20px;display:flex;flex-direction:column}
.bb-drawer .bb-nav{margin-top:0}
.bb-drawer .btn-close{filter:invert(1) grayscale(1);opacity:.75}
.bb-drawer .bb-nav-label{padding-top:10px}

/* ============ 主内容区 ============ */
.bb-main{margin-left:var(--bb-side-w);transition:margin-left .25s ease;min-height:100vh;display:flex;flex-direction:column}
.bb-main-inner{flex:1;padding-bottom:8px}
.bb-crumb{padding:26px 0 0;font-size:13.5px;color:var(--bb-ink-600)}
.bb-crumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center;list-style:none;margin:0;padding:0}
.bb-crumb li{display:flex;align-items:center;gap:8px}
.bb-crumb li+li::before{content:"/";color:var(--bb-line)}
.bb-crumb a{color:var(--bb-ink-600)}
.bb-crumb a:hover{color:var(--bb-brand-700)}
.bb-crumb .current{color:var(--bb-brand-700);font-weight:600}

/* ============ 横幅 ============ */
.bb-banner{
  position:relative;overflow:hidden;margin-top:18px;
  border-radius:var(--bb-r-card);background:var(--bb-brand-900);
  color:#fff;padding:52px 44px;box-shadow:var(--bb-shadow-md);
}
.bb-banner::before{
  content:"";position:absolute;inset:0;
  background:url(/assets/images/backpic/back-1.png) center/cover no-repeat;
  opacity:.24;
}
.bb-banner::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(92deg,rgba(11,58,46,.95) 0%,rgba(11,58,46,.72) 52%,rgba(11,58,46,.44) 100%);
}
.bb-banner-inner{position:relative;z-index:2;max-width:780px}
.bb-banner h1{font-size:36px;line-height:1.28;color:#fff;margin:16px 0 14px}
.bb-banner-lead{font-size:16.5px;line-height:1.85;color:rgba(255,255,255,.84);max-width:720px}
.bb-badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12.5px;font-weight:600;line-height:1.6;
  padding:4px 11px;border-radius:999px;
  background:var(--bb-brand-50);color:var(--bb-brand-700);
}
.bb-badge-accent{background:var(--bb-accent-100);color:#8A5A0C}
.bb-badge-glass{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.22)}
.bb-banner-stats{
  position:relative;z-index:2;display:flex;flex-wrap:wrap;gap:0;
  margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.16);
}
.bb-banner-stats div{
  flex:1 1 150px;padding-right:20px;margin-right:20px;
  border-right:1px solid rgba(255,255,255,.14);
}
.bb-banner-stats div:last-child{border-right:0;margin-right:0;padding-right:0}
.bb-banner-stats b{
  display:block;font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;
  font-size:24px;color:var(--bb-accent-500);line-height:1.3;
}
.bb-banner-stats span{font-size:13.5px;color:rgba(255,255,255,.72)}

/* ============ 板块 ============ */
.bb-sec{padding-top:64px}
.bb-sec-head{margin-bottom:28px;display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.bb-sec-title{display:flex;align-items:center;gap:12px;font-size:26px;line-height:1.35}
.bb-sec-title::before{content:"";flex:0 0 8px;width:8px;height:24px;border-radius:3px;background:var(--bb-brand-700)}
.bb-sec-desc{margin-top:10px;font-size:15px;color:var(--bb-ink-600);max-width:720px}
.bb-sec-link{font-size:14.5px;font-weight:600;color:var(--bb-brand-700);white-space:nowrap}
.bb-sec-link i{font-size:12px;margin-left:2px}

/* ============ 按钮 ============ */
.bb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 22px;border-radius:var(--bb-r-btn);
  font-size:15px;font-weight:600;line-height:1;border:1px solid transparent;
  cursor:pointer;text-decoration:none;
  transition:background .2s ease,color .2s ease,transform .15s ease,box-shadow .2s ease,border-color .2s ease;
}
.bb-btn:hover{text-decoration:none}
.bb-btn-accent{background:var(--bb-accent-500);color:#22160A}
.bb-btn-accent:hover{background:#cf881f;color:#1A1006;transform:translateY(-1px);box-shadow:var(--bb-shadow-md)}
.bb-btn-accent:active{transform:translateY(0);box-shadow:var(--bb-shadow-sm)}
.bb-btn-ghost{background:transparent;border-color:rgba(255,255,255,.45);color:#fff}
.bb-btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff;color:#fff;transform:translateY(-1px)}
.bb-btn-outline{background:transparent;border-color:var(--bb-brand-700);color:var(--bb-brand-700)}
.bb-btn-outline:hover{background:var(--bb-brand-50);color:var(--bb-brand-900);transform:translateY(-1px)}
.bb-btn-block{width:100%;padding:0 14px}

/* ============ 卡片 ============ */
.bb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.bb-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.bb-grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.bb-card{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);box-shadow:var(--bb-shadow-sm);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.bb-card:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-lg)}
.bb-card-media{aspect-ratio:3/2;overflow:hidden;background:var(--bb-brand-50);position:relative}
.bb-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.bb-card:hover .bb-card-media img{transform:scale(1.035)}
.bb-card-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.bb-card-body h3{font-size:19px;line-height:1.45}
.bb-card-body p{font-size:15px;line-height:1.8;color:var(--bb-ink-600);margin:0}
.bb-card-meta{
  margin-top:auto;padding-top:12px;border-top:1px solid var(--bb-line);
  font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;
  font-size:13px;color:var(--bb-ink-600);display:flex;justify-content:space-between;gap:10px;
}
.bb-tag{
  display:inline-flex;align-items:center;font-size:12.5px;font-weight:600;
  padding:3px 10px;border-radius:999px;background:var(--bb-brand-50);color:var(--bb-brand-700);
}
.bb-tag-line{background:transparent;border:1px solid var(--bb-line);color:var(--bb-ink-600)}

/* 要点小卡 */
.bb-point{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  padding:22px 20px;box-shadow:var(--bb-shadow-sm);
  transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.bb-point:hover{border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-md);transform:translateY(-2px)}
.bb-point i{font-size:19px;color:var(--bb-brand-500);margin-bottom:14px;display:block}
.bb-point h3{font-size:16.5px;line-height:1.5;margin-bottom:8px}
.bb-point p{font-size:14.5px;line-height:1.8;color:var(--bb-ink-600);margin:0}

/* ============ 流程 ============ */
.bb-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.bb-step{
  position:relative;background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);padding:24px 20px;box-shadow:var(--bb-shadow-sm);
  transition:box-shadow .2s ease,border-color .2s ease;
}
.bb-step:hover{border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-md)}
.bb-step-num{
  display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  border-radius:9px;background:var(--bb-brand-900);color:#fff;
  font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;
  font-size:14px;font-weight:700;margin-bottom:14px;
}
.bb-step h3{font-size:16.5px;line-height:1.5;margin-bottom:8px}
.bb-step p{font-size:14.5px;line-height:1.8;color:var(--bb-ink-600);margin:0}

/* ============ 场景 ============ */
.bb-scene{
  display:flex;gap:14px;padding:20px;
  background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);transition:border-color .2s ease,background .2s ease;
}
.bb-scene:hover{border-color:var(--bb-brand-500);background:var(--bb-brand-50)}
.bb-scene i{color:var(--bb-accent-500);font-size:18px;margin-top:5px;flex:0 0 18px}
.bb-scene h3{font-size:16.5px;line-height:1.5;margin-bottom:6px}
.bb-scene p{font-size:14.5px;line-height:1.8;color:var(--bb-ink-600);margin:0}

/* ============ FAQ ============ */
.bb-faq .accordion-item{
  background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card)!important;margin-bottom:12px;overflow:hidden;
}
.bb-faq .accordion-button{
  background:transparent;color:var(--bb-ink-900);font-weight:600;font-size:16.5px;
  line-height:1.6;padding:18px 20px;box-shadow:none;border-radius:var(--bb-r-card)!important;
  display:flex;align-items:center;gap:14px;
}
.bb-faq .accordion-button:not(.collapsed){background:var(--bb-brand-50);color:var(--bb-brand-900)}
.bb-faq .accordion-button:focus{box-shadow:none;border-color:transparent}
.bb-faq .accordion-button::after{
  content:"+";background-image:none;width:auto;height:auto;
  font-size:22px;line-height:1;color:var(--bb-brand-700);font-weight:400;
  margin-left:auto;display:flex;align-items:center;justify-content:center;
  transform:none;transition:transform .22s ease,color .22s ease;
}
.bb-faq .accordion-button:not(.collapsed)::after{content:"−";color:var(--bb-accent-500);transform:rotate(180deg)}
.bb-faq .accordion-body{
  padding:0 20px 20px;background:var(--bb-brand-50);color:var(--bb-ink-600);
  font-size:15.5px;line-height:1.85;
}

/* ============ CTA ============ */
.bb-cta{
  position:relative;overflow:hidden;border-radius:var(--bb-r-card);
  background:var(--bb-brand-900);color:#fff;padding:48px 44px;margin-top:64px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  box-shadow:var(--bb-shadow-md);
}
.bb-cta::before{
  content:"";position:absolute;inset:0;
  background:url(/assets/images/backpic/back-2.webp) center/cover no-repeat;opacity:.18;
}
.bb-cta > *{position:relative;z-index:2}
.bb-cta h2{font-size:26px;line-height:1.35;color:#fff;margin-bottom:10px}
.bb-cta p{color:rgba(255,255,255,.80);font-size:15.5px;max-width:560px;margin:0}
.bb-cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ============ 页脚 ============ */
.bb-footer{background:var(--bb-brand-900);color:rgba(255,255,255,.72);margin-top:72px}
.bb-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px;padding:56px 0 40px}
.bb-footer h4{color:#fff;font-size:15px;letter-spacing:.04em;margin-bottom:16px}
.bb-footer p{font-size:14.5px;line-height:1.85;color:rgba(255,255,255,.72);margin:0}
.bb-footer .bb-logo{padding:0;margin-bottom:14px}
.bb-footer-list{display:flex;flex-direction:column;gap:10px}
.bb-footer-list a{color:rgba(255,255,255,.72);font-size:14.5px}
.bb-footer-list a:hover{color:#fff;text-decoration:none}
.bb-footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14.5px}
.bb-footer-contact span{display:flex;gap:10px;align-items:flex-start}
.bb-footer-contact i{color:var(--bb-accent-500);margin-top:6px;font-size:13px}
.bb-footer-bar{
  border-top:1px solid rgba(255,255,255,.12);padding:20px 0 28px;
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  font-size:13.5px;color:rgba(255,255,255,.56);
}
.bb-footer-bar .bb-num{font-variant-numeric:tabular-nums}

/* ============ 折叠态 ============ */
@media (min-width:1280px){
  body.bb-collapsed .bb-side{width:76px;padding-left:12px;padding-right:12px}
  body.bb-collapsed .bb-main{margin-left:76px}
  body.bb-collapsed .bb-logo-text,
  body.bb-collapsed .bb-nav-label,
  body.bb-collapsed .bb-nav-link span,
  body.bb-collapsed .bb-side-foot .bb-btn span{display:none}
  body.bb-collapsed .bb-logo{justify-content:center;padding:6px 0}
  body.bb-collapsed .bb-side-head{flex-direction:column;gap:12px}
  body.bb-collapsed .bb-nav-link{justify-content:center;padding:11px 0}
  body.bb-collapsed .bb-side-foot .bb-btn{padding:0}
}
@media (max-width:1279.98px){
  .bb-collapse{display:none}
}

/* ============ 响应式 ============ */
@media (max-width:1199.98px){
  .bb-grid{grid-template-columns:repeat(2,1fr)}
  .bb-grid-4{grid-template-columns:repeat(2,1fr)}
  .bb-steps{grid-template-columns:repeat(2,1fr)}
  .bb-footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:28px}
}
@media (max-width:991.98px){
  .bb-side{display:none}
  .bb-topbar{display:flex}
  .bb-main{margin-left:0;padding-top:60px}
  body.bb-collapsed .bb-main{margin-left:0}
  .bb-container{padding:0 22px}
  .bb-banner{padding:40px 26px}
  .bb-banner h1{font-size:29px}
  .bb-cta{padding:36px 26px}
  .bb-cta h2{font-size:22px}
  .bb-sec{padding-top:52px}
}
@media (max-width:767.98px){
  body{font-size:16px}
  .bb-container{padding:0 18px}
  .bb-grid,.bb-grid-4,.bb-grid-2,.bb-steps{grid-template-columns:1fr}
  .bb-card-body p{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .bb-point p,.bb-scene p{display:block}
  .bb-sec-title{font-size:21px}
  .bb-sec-title::before{height:20px}
  .bb-banner h1{font-size:26px}
  .bb-banner-stats div{flex:1 1 100%;border-right:0;margin-right:0;padding-right:0;padding-bottom:12px;margin-bottom:12px;border-bottom:1px solid rgba(255,255,255,.14)}
  .bb-banner-stats div:last-child{border-bottom:0;padding-bottom:0;margin-bottom:0}
  .bb-footer-grid{grid-template-columns:1fr;gap:26px;padding:40px 0 28px}
  .bb-cta{margin-top:48px;flex-direction:column;align-items:flex-start}
}
@media (max-width:575.98px){
  .bb-container{padding:0 14px}
  .bb-banner{padding:32px 18px}
  .bb-cta{padding:30px 18px}
  .bb-cta-actions{width:100%}
  .bb-cta-actions .bb-btn{width:100%}
  .bb-sec{padding-top:44px}
  .bb-faq .accordion-button{font-size:15.5px;padding:16px}
}

/* roulang page: category2 */
:root{
  --bb-brand-900:#0B3A2E;
  --bb-brand-700:#12604A;
  --bb-brand-500:#1E8A6B;
  --bb-brand-50:#EAF4F0;
  --bb-accent-500:#E39A2B;
  --bb-accent-600:#C6821C;
  --bb-accent-100:#FDF1DD;
  --bb-ink-900:#14201C;
  --bb-ink-600:#4A5A54;
  --bb-line:#E2E0D8;
  --bb-bg:#F7F5EF;
  --bb-surface:#FFFFFF;
  --bb-font:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --bb-font-num:"SF Mono","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --bb-r-card:14px;
  --bb-r-btn:10px;
  --bb-r-input:10px;
  --bb-shadow-sm:0 1px 2px rgba(20,32,28,.05);
  --bb-shadow-md:0 6px 18px rgba(11,58,46,.08);
  --bb-shadow-lg:0 16px 36px rgba(11,58,46,.12);
  --bb-sidebar-w:248px;
  --bb-topbar-h:60px;

  --bs-primary:#12604A;
  --bs-primary-rgb:18,96,74;
  --bs-link-color:#12604A;
  --bs-link-hover-color:#0B3A2E;
  --bs-body-color:#14201C;
  --bs-body-bg:#F7F5EF;
  --bs-border-color:#E2E0D8;
  --bs-border-radius:14px;
  --bs-font-sans-serif:var(--bb-font);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--bb-font);
  font-size:16.5px;
  line-height:1.85;
  color:var(--bb-ink-900);
  background:var(--bb-bg);
  text-align:left;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--bb-brand-700);text-decoration:none;transition:color .18s ease,text-underline-offset .18s ease;}
a:hover{color:var(--bb-brand-900);text-decoration:underline;text-underline-offset:3px;}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit;}
h1,h2,h3,h4{margin:1.6em 0 .6em;color:var(--bb-ink-900);font-weight:700;letter-spacing:-.01em;}
h1{margin-top:0;font-size:36px;line-height:1.28;}
h2{font-size:26px;line-height:1.35;}
h3{font-size:19px;line-height:1.45;margin-top:0;}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
ul,ol{margin:0 0 1em;padding-left:1.15em;}
li{margin-bottom:.35em;}
.num{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;}
:focus-visible{outline:2px solid var(--bb-accent-500);outline-offset:2px;border-radius:4px;}

/* ---------- 布局骨架 ---------- */
.bb-main{margin-left:var(--bb-sidebar-w);min-height:100vh;}
.bb-container{max-width:1200px;margin:0 auto;padding:0 32px;}
.bb-section{padding:64px 0;}
.bb-section--tight{padding:48px 0;}

/* ---------- 侧栏 ---------- */
.bb-sidebar{
  position:fixed;inset:0 auto 0 0;width:var(--bb-sidebar-w);
  background:var(--bb-brand-900);
  border-right:1px solid rgba(255,255,255,.08);
  display:flex;flex-direction:column;
  padding:22px 16px 20px;
  z-index:1040;overflow-y:auto;
}
.bb-logo{display:flex;align-items:center;gap:10px;padding:6px 8px 18px;text-decoration:none;}
.bb-logo:hover{text-decoration:none;}
.bb-logo-mark{
  width:34px;height:34px;flex:0 0 34px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 32% 30%,var(--bb-brand-500),var(--bb-brand-700));
  color:#fff;font-size:15px;position:relative;
}
.bb-logo-mark::after{
  content:"";position:absolute;right:-4px;top:-3px;width:12px;height:12px;
  border:2px solid var(--bb-accent-500);border-radius:50%;border-left-color:transparent;border-bottom-color:transparent;
}
.bb-logo-text{color:#fff;font-weight:700;font-size:17px;line-height:1.25;letter-spacing:.01em;}
.bb-nav{display:flex;flex-direction:column;gap:4px;}
.bb-nav-label{
  padding:18px 12px 8px;font-size:12px;letter-spacing:.14em;
  color:rgba(255,255,255,.42);text-transform:uppercase;
}
.bb-nav-link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 12px;border-radius:10px;
  color:rgba(255,255,255,.74);font-size:15px;text-decoration:none;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.bb-nav-link i{width:18px;text-align:center;font-size:14px;opacity:.85;}
.bb-nav-link:hover{background:rgba(255,255,255,.09);color:#fff;text-decoration:none;transform:translateX(2px);}
.bb-nav-link.active{background:rgba(255,255,255,.1);color:#fff;font-weight:600;}
.bb-nav-link.active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:22px;border-radius:2px;background:var(--bb-accent-500);
}
.bb-side-cta{margin-top:auto;padding-top:24px;}
.bb-side-note{
  font-size:12.5px;line-height:1.7;color:rgba(255,255,255,.5);
  padding:0 8px 12px;
}

/* ---------- 按钮 ---------- */
.bb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--bb-r-btn);
  font-size:15px;font-weight:600;line-height:1.2;
  border:1px solid transparent;cursor:pointer;text-decoration:none;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.bb-btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--bb-shadow-md);}
.bb-btn:active{transform:translateY(0);box-shadow:var(--bb-shadow-sm);}
.bb-btn-accent{background:var(--bb-accent-500);color:#1D1403;}
.bb-btn-accent:hover{background:var(--bb-accent-600);color:#1D1403;}
.bb-btn-primary{background:var(--bb-brand-700);color:#fff;}
.bb-btn-primary:hover{background:var(--bb-brand-900);color:#fff;}
.bb-btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.34);}
.bb-btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.6);}
.bb-btn-outline{background:transparent;color:var(--bb-brand-700);border-color:var(--bb-line);}
.bb-btn-outline:hover{background:var(--bb-brand-50);color:var(--bb-brand-900);border-color:var(--bb-brand-500);}
.bb-btn-block{width:100%;}
.bb-btn-lg{padding:14px 28px;font-size:16px;}

/* ---------- 移动顶栏 ---------- */
.bb-mobilebar{
  display:none;position:fixed;top:0;left:0;right:0;height:var(--bb-topbar-h);
  background:var(--bb-brand-900);z-index:1050;
  align-items:center;justify-content:space-between;padding:0 16px;
  box-shadow:var(--bb-shadow-md);
}
.bb-mobilebar .bb-logo-text{font-size:16px;}
.bb-burger{
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);
  color:#fff;width:40px;height:40px;border-radius:10px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
}
.bb-burger:hover{background:rgba(255,255,255,.18);}
.bb-drawer{background:var(--bb-brand-900)!important;color:#fff;width:280px!important;}
.bb-drawer .offcanvas-header{border-bottom:1px solid rgba(255,255,255,.1);padding:16px 18px;}
.bb-drawer .offcanvas-body{padding:12px 14px;}
.bb-drawer .bb-nav-link{font-size:15.5px;}
.bb-drawer .bb-btn{margin-top:8px;}
.bb-drawer-footer{padding:12px 16px 20px;border-top:1px solid rgba(255,255,255,.1);}

/* ---------- 横幅 ---------- */
.bb-banner{
  position:relative;margin-top:36px;border-radius:20px;overflow:hidden;
  padding:56px 48px 52px;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  box-shadow:var(--bb-shadow-lg);
}
.bb-banner::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(115deg,rgba(11,58,46,.95) 0%,rgba(11,58,46,.82) 48%,rgba(18,96,74,.66) 100%);
}
.bb-banner>*{position:relative;z-index:1;}
.bb-kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--bb-font-num);font-size:12.5px;letter-spacing:.14em;
  color:var(--bb-accent-100);background:rgba(227,154,43,.16);
  border:1px solid rgba(227,154,43,.34);
  padding:6px 14px;border-radius:999px;margin-bottom:20px;text-transform:uppercase;
}
.bb-banner h1{color:#fff;font-size:36px;line-height:1.28;margin-bottom:16px;max-width:760px;}
.bb-banner h1 .hl{color:var(--bb-accent-500);}
.bb-banner-lede{color:rgba(255,255,255,.82);font-size:16.5px;line-height:1.85;max-width:640px;margin-bottom:28px;}
.bb-banner-actions{display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- 面包屑 ---------- */
.bb-crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13.5px;color:var(--bb-ink-600);padding:22px 0 0;}
.bb-crumb a{color:var(--bb-ink-600);}
.bb-crumb a:hover{color:var(--bb-brand-700);}
.bb-crumb .sep{color:var(--bb-line);}
.bb-crumb .now{color:var(--bb-brand-700);font-weight:600;}

/* ---------- 区块标题组 ---------- */
.bb-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px;}
.bb-head-l{display:flex;align-items:flex-start;gap:14px;}
.bb-head-bar{width:8px;height:26px;border-radius:3px;background:var(--bb-brand-700);flex:0 0 8px;margin-top:5px;}
.bb-head h2{margin:0 0 6px;font-size:26px;}
.bb-head .sub{margin:0;font-size:14.5px;color:var(--bb-ink-600);max-width:620px;}
.bb-head-more{font-size:14.5px;font-weight:600;color:var(--bb-brand-700);white-space:nowrap;}
.bb-head-more i{font-size:12px;margin-left:4px;}

/* ---------- 索引卡 ---------- */
.bb-index-card{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  padding:22px;box-shadow:var(--bb-shadow-sm);
}
.bb-index-title{
  font-size:13px;letter-spacing:.12em;color:var(--bb-ink-600);
  text-transform:uppercase;font-family:var(--bb-font-num);
  padding-bottom:14px;margin-bottom:12px;border-bottom:1px dashed var(--bb-line);
}
.bb-index-link{
  position:relative;display:flex;gap:12px;align-items:flex-start;
  padding:11px 12px 11px 14px;border-radius:10px;
  font-size:15px;color:var(--bb-ink-600);text-decoration:none;
  transition:background .18s ease,color .18s ease;
}
.bb-index-link .idx{font-family:var(--bb-font-num);font-size:13px;color:var(--bb-brand-500);padding-top:2px;}
.bb-index-link:hover{background:var(--bb-brand-50);color:var(--bb-brand-900);text-decoration:none;}
.bb-index-link.is-current{background:var(--bb-brand-50);color:var(--bb-brand-900);font-weight:600;}
.bb-index-link.is-current::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:3px;
  border-radius:2px;background:var(--bb-accent-500);
}
.bb-index-meta{margin-top:16px;padding-top:16px;border-top:1px dashed var(--bb-line);font-size:13.5px;color:var(--bb-ink-600);line-height:1.8;}

/* ---------- 图文交错 ---------- */
.bb-stack{display:flex;flex-direction:column;gap:48px;}
.bb-feature{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  overflow:hidden;box-shadow:var(--bb-shadow-sm);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.bb-feature:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-lg);}
.bb-feature-grid{display:grid;grid-template-columns:1fr 1.15fr;align-items:stretch;}
.bb-feature-grid.rev{grid-template-columns:1.15fr 1fr;}
.bb-feature-grid.rev .bb-feature-media{order:2;}
.bb-feature-media{position:relative;overflow:hidden;background:var(--bb-brand-50);min-height:268px;}
.bb-feature-media img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;}
.bb-feature-body{padding:32px 34px;}
.bb-feature-body h3{font-size:19px;margin-bottom:12px;}
.bb-feature-body p{font-size:15px;line-height:1.8;color:var(--bb-ink-600);}
.bb-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;}
.bb-badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;font-size:12.5px;font-weight:600;
  background:var(--bb-brand-50);color:var(--bb-brand-700);
}
.bb-badge-accent{background:var(--bb-accent-100);color:#8A5A0B;}
.bb-feature-foot{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px;
  margin-top:20px;padding-top:16px;border-top:1px solid var(--bb-line);
  font-size:13.5px;color:var(--bb-ink-600);
}
.bb-feature-foot .num{color:var(--bb-brand-700);font-weight:600;}

.bb-mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.bb-mini{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  overflow:hidden;box-shadow:var(--bb-shadow-sm);display:flex;flex-direction:column;
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.bb-mini:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-lg);}
.bb-mini-media{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bb-brand-50);}
.bb-mini-media img{width:100%;height:100%;object-fit:cover;}
.bb-mini-body{padding:20px 22px 24px;}
.bb-mini-body h3{font-size:17px;margin-bottom:8px;}
.bb-mini-body p{font-size:14.5px;line-height:1.8;color:var(--bb-ink-600);margin-bottom:0;}

/* ---------- 指标带 ---------- */
.bb-metrics{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  padding:8px 0;box-shadow:var(--bb-shadow-sm);
}
.bb-metric-row{display:grid;grid-template-columns:repeat(4,1fr);}
.bb-metric{padding:26px 24px;border-left:1px solid var(--bb-line);}
.bb-metric:first-child{border-left:0;}
.bb-metric .v{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;font-size:30px;line-height:1.1;color:var(--bb-brand-700);font-weight:600;}
.bb-metric .v small{font-size:15px;margin-left:2px;color:var(--bb-ink-600);font-weight:500;}
.bb-metric .k{margin-top:8px;font-size:13.5px;color:var(--bb-ink-600);}

/* ---------- 流程 ---------- */
.bb-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step;}
.bb-step{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  padding:26px 24px;box-shadow:var(--bb-shadow-sm);position:relative;
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.bb-step:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-lg);}
.bb-step-no{
  font-family:var(--bb-font-num);font-size:13px;letter-spacing:.1em;
  color:#8A5A0B;background:var(--bb-accent-100);border-radius:6px;
  padding:3px 10px;display:inline-block;margin-bottom:14px;
}
.bb-step h3{font-size:17px;margin-bottom:8px;}
.bb-step p{font-size:14.5px;line-height:1.8;color:var(--bb-ink-600);margin-bottom:0;}

/* ---------- FAQ ---------- */
.bb-faq .accordion-item{
  border:1px solid var(--bb-line)!important;border-radius:var(--bb-r-card)!important;
  margin-bottom:12px;overflow:hidden;background:var(--bb-surface);box-shadow:var(--bb-shadow-sm);
}
.bb-faq .accordion-button{
  background:transparent;box-shadow:none!important;border:0;
  padding:20px 22px;font-size:16.5px;font-weight:600;color:var(--bb-ink-900);
  display:flex;align-items:center;gap:14px;line-height:1.6;
}
.bb-faq .accordion-button:not(.collapsed){background:var(--bb-brand-50);color:var(--bb-brand-700);}
.bb-faq .accordion-button::after{
  content:"+";background-image:none!important;
  width:26px;height:26px;flex:0 0 26px;margin-left:auto;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--bb-font-num);font-size:20px;line-height:1;
  color:var(--bb-accent-500);transform:none;
  transition:color .22s ease,transform .22s ease;
}
.bb-faq .accordion-button:not(.collapsed)::after{content:"−";transform:rotate(180deg);}
.bb-faq .accordion-body{
  background:var(--bb-brand-50);padding:20px 22px 22px;
  font-size:15.5px;line-height:1.85;color:var(--bb-ink-600);
}

/* ---------- CTA ---------- */
.bb-cta{
  position:relative;overflow:hidden;border-radius:20px;
  background:var(--bb-brand-900);color:#fff;padding:56px 48px;
  box-shadow:var(--bb-shadow-lg);
}
.bb-cta::after{
  content:"";position:absolute;right:-80px;bottom:-120px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(227,154,43,.28),transparent 68%);
}
.bb-cta-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
.bb-cta h2{color:#fff;font-size:26px;margin:0 0 12px;}
.bb-cta p{color:rgba(255,255,255,.76);font-size:15.5px;margin-bottom:0;}
.bb-form{display:flex;gap:10px;flex-wrap:wrap;}
.bb-input{
  flex:1 1 200px;min-width:0;height:48px;padding:0 16px;
  border-radius:var(--bb-r-input);border:1px solid rgba(255,255,255,.24);
  background:rgba(255,255,255,.08);color:#fff;font-size:15px;
  transition:border-color .18s ease,box-shadow .18s ease,background .18s ease;
}
.bb-input::placeholder{color:rgba(255,255,255,.5);}
.bb-input:focus{outline:none;border-color:var(--bb-accent-500);box-shadow:0 0 0 3px rgba(227,154,43,.28);background:rgba(255,255,255,.12);}
.bb-form-note{width:100%;font-size:13px;color:rgba(255,255,255,.55);margin-top:10px;}

/* ---------- 页脚 ---------- */
.bb-footer{background:var(--bb-brand-900);color:rgba(255,255,255,.72);margin-top:72px;padding:64px 0 0;}
.bb-footer a{color:rgba(255,255,255,.72);}
.bb-footer a:hover{color:#fff;text-decoration:none;}
.bb-footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;}
.bb-footer h4{color:#fff;font-size:15px;margin:0 0 16px;letter-spacing:.02em;}
.bb-footer .bb-logo{padding:0 0 16px;}
.bb-footer .bb-logo-text{font-size:18px;}
.bb-footer p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.66);}
.bb-footer ul{list-style:none;padding:0;margin:0;}
.bb-footer li{margin-bottom:10px;font-size:14.5px;}
.bb-footer-bottom{
  margin-top:48px;border-top:1px solid rgba(255,255,255,.12);
  padding:20px 0;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13.5px;color:rgba(255,255,255,.56);
}
.bb-footer-bottom .num{letter-spacing:.04em;}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .bb-container{padding:0 24px;}
  .bb-feature-body{padding:28px 26px;}
  .bb-steps{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:991px){
  .bb-sidebar{display:none;}
  .bb-mobilebar{display:flex;}
  .bb-main{margin-left:0;padding-top:var(--bb-topbar-h);}
  .bb-banner{margin-top:24px;padding:40px 28px 40px;border-radius:16px;}
  .bb-banner h1{font-size:26px;}
  .bb-section{padding:48px 0;}
  .bb-section--tight{padding:36px 0;}
  .bb-head h2{font-size:21px;}
  .bb-feature-grid,.bb-feature-grid.rev{grid-template-columns:1fr;}
  .bb-feature-grid.rev .bb-feature-media{order:0;}
  .bb-feature-media{min-height:0;aspect-ratio:16/9;}
  .bb-feature-media img{position:static;}
  .bb-metric-row{grid-template-columns:repeat(2,1fr);}
  .bb-metric{border-left:0;border-top:1px solid var(--bb-line);}
  .bb-metric:nth-child(-n+2){border-top:0;}
  .bb-metric:nth-child(even){border-left:1px solid var(--bb-line);}
  .bb-cta{padding:40px 28px;border-radius:16px;}
  .bb-cta-inner{grid-template-columns:1fr;gap:28px;}
  .bb-footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:767px){
  body{font-size:16px;}
  .bb-container{padding:0 18px;}
  .bb-mini-grid{grid-template-columns:1fr;}
  .bb-steps{grid-template-columns:1fr;}
  .bb-banner{padding:34px 22px;}
  .bb-banner-lede{font-size:15.5px;}
  .bb-head{margin-bottom:24px;}
  .bb-stack{gap:32px;}
  .bb-footer-grid{grid-template-columns:1fr;}
  .bb-footer{padding-top:48px;}
}
@media (max-width:575px){
  .bb-banner-actions{flex-direction:column;}
  .bb-btn{width:100%;}
  .bb-banner-actions .bb-btn{width:100%;}
  .bb-metric-row{grid-template-columns:1fr;}
  .bb-metric{border-left:0!important;}
  .bb-metric:nth-child(2){border-top:1px solid var(--bb-line);}
  .bb-form{flex-direction:column;}
  .bb-input{width:100%;}
  .bb-feature-body{padding:22px 20px;}
  .bb-index-card{padding:18px;}
}

/* roulang page: category3 */
:root{
  --bb-brand-900:#0B3A2E;
  --bb-brand-700:#12604A;
  --bb-brand-500:#1E8A6B;
  --bb-brand-50:#EAF4F0;
  --bb-accent-500:#E39A2B;
  --bb-accent-100:#FDF1DD;
  --bb-ink-900:#14201C;
  --bb-ink-600:#4A5A54;
  --bb-line:#E2E0D8;
  --bb-bg:#F7F5EF;
  --bb-surface:#FFFFFF;
  --bb-r-card:14px;
  --bb-r-btn:10px;
  --bb-r-input:10px;
  --bb-shadow-sm:0 1px 2px rgba(20,32,28,.05);
  --bb-shadow-md:0 6px 18px rgba(11,58,46,.08);
  --bb-shadow-lg:0 16px 36px rgba(11,58,46,.12);
  --bb-font:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --bb-font-num:"SF Mono","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --bs-primary:#12604A;
  --bs-link-color:#12604A;
  --bs-link-hover-color:#0B3A2E;
  --bs-body-color:#14201C;
  --bs-body-bg:#F7F5EF;
  --bs-border-color:#E2E0D8;
  --bs-border-radius:14px;
  --bs-font-sans-serif:var(--bb-font);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;font-family:var(--bb-font);font-size:16.5px;line-height:1.85;color:var(--bb-ink-900);background:var(--bb-bg);text-align:left;}
img{max-width:100%;display:block;object-fit:cover;}
a{color:var(--bb-brand-700);text-decoration:none;transition:color .18s ease;}
a:hover{color:var(--bb-brand-900);text-decoration:underline;text-underline-offset:3px;}
h1,h2,h3,h4{margin:1.6em 0 .6em;font-weight:700;line-height:1.35;color:var(--bb-ink-900);}
h1{font-size:36px;line-height:1.28;margin-top:0;}
h2{font-size:26px;}
h3{font-size:19px;line-height:1.45;}
p{margin:0 0 1em;}
ul{margin:0 0 1em;padding-left:1.15em;}
ul li{margin-bottom:.4em;}
ul li::marker{color:var(--bb-accent-500);}
:focus-visible{outline:2px solid var(--bb-accent-500);outline-offset:2px;}
.num{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;}

/* ============ App Shell ============ */
.bb-sidebar{
  position:fixed;top:0;left:0;width:248px;height:100vh;z-index:1040;
  background:var(--bb-brand-900);color:rgba(255,255,255,.72);
  padding:22px 14px 18px;display:flex;flex-direction:column;gap:6px;
  overflow-y:auto;box-shadow:1px 0 0 rgba(255,255,255,.06);
  transition:width .2s ease,padding .2s ease;
}
.bb-logo{display:flex;align-items:center;gap:10px;padding:6px 8px 16px;text-decoration:none;}
.bb-logo:hover{text-decoration:none;}
.bb-logo-mark{flex:0 0 auto;display:inline-flex;}
.bb-logo-text{font-size:17px;font-weight:700;color:#fff;letter-spacing:.2px;line-height:1.2;}
.bb-logo-sub{display:block;font-size:11.5px;font-weight:400;letter-spacing:1.2px;color:rgba(255,255,255,.5);text-transform:uppercase;}
.bb-nav{display:flex;flex-direction:column;gap:4px;}
.bb-nav-label{font-size:12px;letter-spacing:1.5px;color:rgba(255,255,255,.38);padding:16px 12px 8px;}
.bb-nav-link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 12px;border-radius:10px;font-size:15px;color:rgba(255,255,255,.72);
  text-decoration:none;transition:background .18s ease,color .18s ease;
}
.bb-nav-link i{width:18px;text-align:center;font-size:15px;opacity:.85;}
.bb-nav-link:hover{background:rgba(255,255,255,.08);color:#fff;text-decoration:none;}
.bb-nav-link.active{background:rgba(255,255,255,.09);color:#fff;font-weight:600;}
.bb-nav-link.active::before{content:"";position:absolute;left:-14px;top:8px;bottom:8px;width:3px;border-radius:0 3px 3px 0;background:var(--bb-accent-500);}
.bb-side-foot{margin-top:auto;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);}
.bb-side-cta{
  display:flex;align-items:center;justify-content:center;gap:8px;
  width:100%;height:46px;border-radius:var(--bb-r-btn);border:0;
  background:var(--bb-accent-500);color:#1B1400;font-weight:700;font-size:15px;
  text-decoration:none;transition:background .18s ease,transform .18s ease,box-shadow .18s ease;
}
.bb-side-cta:hover{background:#cf8a20;color:#1B1400;text-decoration:none;transform:translateY(-1px);box-shadow:var(--bb-shadow-md);}
.bb-collapse-btn{
  align-self:flex-end;width:30px;height:30px;border-radius:8px;border:1px solid rgba(255,255,255,.18);
  background:transparent;color:rgba(255,255,255,.7);font-size:12px;cursor:pointer;display:none;
  align-items:center;justify-content:center;transition:background .18s ease,color .18s ease;margin-bottom:6px;
}
.bb-collapse-btn:hover{background:rgba(255,255,255,.1);color:#fff;}
.bb-main{margin-left:248px;transition:margin-left .2s ease;padding-bottom:0;}

/* 移动端顶栏 */
.bb-topbar{
  display:none;position:fixed;top:0;left:0;right:0;height:60px;z-index:1035;
  background:var(--bb-brand-900);align-items:center;justify-content:space-between;
  padding:0 16px;box-shadow:0 2px 12px rgba(11,58,46,.18);
}
.bb-topbar .bb-logo-text{font-size:16px;}
.bb-burger{
  width:40px;height:40px;border-radius:10px;border:1px solid rgba(255,255,255,.2);
  background:transparent;color:#fff;font-size:17px;display:inline-flex;align-items:center;justify-content:center;
}
.bb-burger:hover{background:rgba(255,255,255,.1);}
.bb-drawer{background:var(--bb-brand-900)!important;color:rgba(255,255,255,.75);width:288px!important;}
.bb-drawer .offcanvas-header{border-bottom:1px solid rgba(255,255,255,.12);padding:16px 18px;}
.bb-drawer .offcanvas-body{padding:14px;}
.bb-drawer .bb-nav-link{font-size:15.5px;}
.bb-drawer-close{width:36px;height:36px;border-radius:9px;border:1px solid rgba(255,255,255,.2);background:transparent;color:#fff;}
.bb-drawer-close:hover{background:rgba(255,255,255,.1);}
.bb-drawer .bb-side-cta{margin-top:22px;}
.offcanvas-backdrop.show{opacity:.55;background:rgba(11,58,46,.45);}

/* ============ 容器 ============ */
.bb-container{max-width:1200px;margin:0 auto;padding:0 32px;}

/* 面包屑 */
.bb-crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13.5px;color:var(--bb-ink-600);padding:26px 0 18px;font-family:var(--bb-font-num);}
.bb-crumb a{color:var(--bb-ink-600);}
.bb-crumb a:hover{color:var(--bb-brand-700);}
.bb-crumb span.sep{color:#B8B6AC;}

/* 标签 / 徽章 */
.bb-chip{
  display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 12px;
  border-radius:999px;background:var(--bb-accent-100);color:#8A5A0B;
  font-size:13px;font-weight:600;letter-spacing:.4px;
}
.bb-badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  background:var(--bb-brand-50);color:var(--bb-brand-700);font-size:12.5px;font-weight:600;
  border:1px solid rgba(30,138,107,.18);
}
.bb-badge.is-accent{background:var(--bb-accent-100);color:#8A5A0B;border-color:rgba(227,154,43,.28);}

/* ============ 按钮 ============ */
.bb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--bb-r-btn);border:1px solid transparent;
  font-size:15.5px;font-weight:600;font-family:var(--bb-font);cursor:pointer;
  text-decoration:none;transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.bb-btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--bb-shadow-md);}
.bb-btn:active{transform:translateY(0);box-shadow:var(--bb-shadow-sm);}
.bb-btn-primary{background:var(--bb-accent-500);color:#1B1400;}
.bb-btn-primary:hover{background:#cf8a20;color:#1B1400;}
.bb-btn-ghost{background:transparent;color:var(--bb-brand-700);border-color:var(--bb-line);}
.bb-btn-ghost:hover{border-color:var(--bb-brand-500);background:var(--bb-brand-50);color:var(--bb-brand-900);}
.bb-btn-solid{background:var(--bb-brand-700);color:#fff;}
.bb-btn-solid:hover{background:var(--bb-brand-900);color:#fff;}
.bb-btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.35);}
.bb-btn-outline-light:hover{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.6);}
.bb-btn-sm{height:40px;padding:0 18px;font-size:14.5px;}

/* ============ Banner ============ */
.bb-banner{
  position:relative;overflow:hidden;border-radius:20px;background:var(--bb-surface);
  border:1px solid var(--bb-line);box-shadow:var(--bb-shadow-sm);
  display:grid;grid-template-columns:7fr 5fr;gap:0;
}
.bb-banner-text{padding:44px 40px 40px;position:relative;z-index:2;}
.bb-banner-text h1{font-size:34px;margin:14px 0 13px;}
.bb-banner-text h1 em{font-style:normal;color:var(--bb-brand-700);}
.bb-lead{font-size:16px;color:var(--bb-ink-600);max-width:52ch;margin-bottom:22px;}
.bb-banner-actions{display:flex;flex-wrap:wrap;gap:12px;}
.bb-banner-media{position:relative;min-height:300px;background:var(--bb-brand-50);}
.bb-banner-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.bb-banner-media::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(247,245,239,.85) 0%,rgba(247,245,239,0) 42%);}
.bb-status{
  position:absolute;left:20px;bottom:20px;z-index:3;display:inline-flex;align-items:center;gap:9px;
  background:rgba(255,255,255,.94);border:1px solid var(--bb-line);border-radius:999px;
  padding:8px 15px;font-size:13px;color:var(--bb-ink-600);box-shadow:var(--bb-shadow-sm);
}
.bb-dot{width:8px;height:8px;border-radius:50%;background:var(--bb-brand-500);box-shadow:0 0 0 4px rgba(30,138,107,.16);}

/* 指标条 */
.bb-metrics{
  margin-top:22px;background:var(--bb-surface);border:1px solid var(--bb-line);
  border-radius:var(--bb-r-card);box-shadow:var(--bb-shadow-sm);
  display:grid;grid-template-columns:repeat(4,1fr);
}
.bb-metric{padding:20px 22px;border-right:1px solid var(--bb-line);}
.bb-metric:last-child{border-right:0;}
.bb-metric .val{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;font-size:24px;font-weight:700;color:var(--bb-brand-900);line-height:1.3;}
.bb-metric .val em{font-style:normal;font-size:14px;color:var(--bb-ink-600);font-weight:600;margin-left:3px;}
.bb-metric .lbl{font-size:13.5px;color:var(--bb-ink-600);margin-top:2px;}

/* ============ 主体网格 ============ */
.bb-layout{display:grid;grid-template-columns:8fr 4fr;gap:40px;align-items:start;padding:56px 0 8px;}
.bb-sec-head{display:flex;align-items:center;gap:12px;margin-bottom:22px;}
.bb-sec-head .bar{width:8px;height:24px;border-radius:2px;background:var(--bb-brand-700);flex:0 0 auto;}
.bb-sec-head h2{margin:0;font-size:24px;}
.bb-sec-head .more{margin-left:auto;font-size:14px;color:var(--bb-brand-700);white-space:nowrap;}

/* 序号索引列表 */
.bb-index{list-style:none;margin:0;padding:0;}
.bb-index-item{
  display:grid;grid-template-columns:52px 1fr;gap:20px;
  padding:26px 14px 26px 0;border-bottom:1px solid var(--bb-line);
  transition:background .2s ease,padding-left .2s ease;
}
.bb-index-item:hover{background:var(--bb-brand-50);padding-left:14px;border-radius:12px;}
.bb-idx{
  width:44px;height:44px;border-radius:11px;background:var(--bb-brand-50);
  color:var(--bb-brand-700);font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;
  font-size:16px;font-weight:700;display:flex;align-items:center;justify-content:center;
  border:1px solid rgba(30,138,107,.16);transition:background .2s ease,color .2s ease;
}
.bb-index-item:hover .bb-idx{background:var(--bb-accent-500);color:#1B1400;border-color:var(--bb-accent-500);}
.bb-index-item h3{margin:0 0 6px;font-size:18px;}
.bb-index-item p{margin:0 0 10px;font-size:15px;line-height:1.8;color:var(--bb-ink-600);}
.bb-tags{display:flex;flex-wrap:wrap;gap:8px;}

/* 侧栏卡 */
.bb-aside{position:sticky;top:88px;display:flex;flex-direction:column;gap:20px;}
.bb-card{
  background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);
  box-shadow:var(--bb-shadow-sm);padding:24px;transition:box-shadow .2s ease,border-color .2s ease,transform .2s ease;
}
.bb-card h3{font-size:17px;margin:0 0 14px;}
.bb-card-list{list-style:none;margin:0;padding:0;}
.bb-card-list li{border-bottom:1px solid var(--bb-line);}
.bb-card-list li:last-child{border-bottom:0;}
.bb-card-list a{
  display:flex;align-items:center;gap:10px;padding:13px 0;font-size:15px;color:var(--bb-ink-900);
  transition:color .18s ease,padding-left .18s ease;
}
.bb-card-list a:hover{color:var(--bb-brand-700);text-decoration:none;padding-left:4px;}
.bb-card-list a i{color:var(--bb-brand-500);font-size:13px;}
.bb-card-list a .t{margin-left:auto;font-family:var(--bb-font-num);font-size:13px;color:var(--bb-ink-600);}
.bb-card-media{border-radius:12px;overflow:hidden;margin-bottom:16px;aspect-ratio:3/2;border:1px solid var(--bb-line);}
.bb-card-media img{width:100%;height:100%;object-fit:cover;}
.bb-card-dark{background:var(--bb-brand-900);border-color:rgba(255,255,255,.1);color:rgba(255,255,255,.75);}
.bb-card-dark h3{color:#fff;}
.bb-card-dark p{font-size:14.5px;color:rgba(255,255,255,.72);margin-bottom:16px;}
.bb-chan{list-style:none;margin:0;padding:0;font-size:14.5px;}
.bb-chan li{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px dashed rgba(255,255,255,.14);}
.bb-chan li:last-child{border-bottom:0;}
.bb-chan .n{font-family:var(--bb-font-num);color:var(--bb-accent-500);}

/* 流程 */
.bb-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:8px;}
.bb-flow-item{background:var(--bb-surface);border:1px solid var(--bb-line);border-radius:var(--bb-r-card);padding:22px 20px;box-shadow:var(--bb-shadow-sm);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;}
.bb-flow-item:hover{transform:translateY(-2px);border-color:var(--bb-brand-500);box-shadow:var(--bb-shadow-lg);}
.bb-flow-item .step{font-family:var(--bb-font-num);font-variant-numeric:tabular-nums;font-size:13px;letter-spacing:1px;color:var(--bb-accent-500);font-weight:700;}
.bb-flow-item h3{font-size:16.5px;margin:8px 0 6px;}
.bb-flow-item p{font-size:14.5px;color:var(--bb-ink-600);margin:0;line-height:1.75;}

/* FAQ */
.bb-faq{margin-top:8px;}
.bb-faq .accordion-item{border:1px solid var(--bb-line)!important;border-radius:12px!important;margin-bottom:12px;background:var(--bb-surface);overflow:hidden;box-shadow:var(--bb-shadow-sm);}
.bb-faq .accordion-button{
  font-size:16.5px;font-weight:600;color:var(--bb-ink-900);background:transparent;
  padding:18px 20px;box-shadow:none!important;border-radius:12px!important;
}
.bb-faq .accordion-button:not(.collapsed){background:var(--bb-brand-50);color:var(--bb-brand-900);}
.bb-faq .accordion-button::after{
  content:"+";background-image:none;width:auto;height:auto;font-size:20px;font-weight:400;
  color:var(--bb-brand-700);display:flex;align-items:center;justify-content:center;
  transition:transform .2s ease,color .2s ease;margin-left:16px;
}
.bb-faq .accordion-button:not(.collapsed)::after{content:"−";color:var(--bb-accent-500);transform:rotate(180deg);}
.bb-faq .accordion-body{background:var(--bb-brand-50);padding:18px 20px 20px;font-size:15px;color:var(--bb-ink-600);line-height:1.8;}

/* CTA */
.bb-cta{margin:72px 0 0;background:var(--bb-brand-900);color:rgba(255,255,255,.78);border-radius:20px;overflow:hidden;}
.bb-cta-inner{padding:48px 40px;display:grid;grid-template-columns:6fr 6fr;gap:40px;align-items:center;}
.bb-cta h2{color:#fff;font-size:26px;margin:0 0 12px;}
.bb-cta p{color:rgba(255,255,255,.72);font-size:15.5px;margin:0;}
.bb-form{display:flex;gap:12px;}
.bb-form input{
  flex:1;height:48px;padding:0 16px;border-radius:var(--bb-r-input);
  border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.06);
  color:#fff;font-size:15px;font-family:var(--bb-font);
}
.bb-form input::placeholder{color:rgba(255,255,255,.45);}
.bb-form input:focus{outline:none;border-color:var(--bb-accent-500);box-shadow:0 0 0 3px rgba(227,154,43,.28);background:rgba(255,255,255,.1);}
.bb-form-note{font-size:13.5px;color:rgba(255,255,255,.55);margin:12px 0 0;}

/* 页脚 */
.bb-footer{background:var(--bb-brand-900);color:rgba(255,255,255,.72);margin-top:72px;}
.bb-footer-grid{
  max-width:1200px;margin:0 auto;padding:56px 32px 40px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;
}
.bb-footer h4{color:#fff;font-size:15px;margin:0 0 16px;letter-spacing:.5px;}
.bb-footer p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.68);}
.bb-footer ul{list-style:none;margin:0;padding:0;}
.bb-footer ul li{margin-bottom:10px;}
.bb-footer ul li a{color:rgba(255,255,255,.72);font-size:14.5px;}
.bb-footer ul li a:hover{color:#fff;text-decoration:none;}
.bb-footer .bb-logo{padding:0 0 14px;}
.bb-footer-bottom{
  border-top:1px solid rgba(255,255,255,.14);
  max-width:1200px;margin:0 auto;padding:18px 32px 26px;
  display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;
  font-size:13.5px;color:rgba(255,255,255,.55);font-family:var(--bb-font-num);
}

/* 响应式 */
@media (min-width:1280px){
  .bb-collapse-btn{display:inline-flex;}
  body.bb-collapsed .bb-sidebar{width:76px;padding:22px 10px 18px;}
  body.bb-collapsed .bb-sidebar .bb-logo-text,
  body.bb-collapsed .bb-sidebar .bb-nav-label,
  body.bb-collapsed .bb-sidebar .bb-nav-link span,
  body.bb-collapsed .bb-sidebar .bb-side-cta span{display:none;}
  body.bb-collapsed .bb-logo{justify-content:center;padding-left:0;padding-right:0;}
  body.bb-collapsed .bb-nav-link{justify-content:center;padding:12px 0;}
  body.bb-collapsed .bb-nav-link.active::before{left:-10px;}
  body.bb-collapsed .bb-side-cta{width:46px;height:46px;padding:0;margin:0 auto;}
  body.bb-collapsed .bb-main{margin-left:76px;}
}
@media (max-width:1199px){
  .bb-layout{grid-template-columns:1fr;gap:32px;}
  .bb-aside{position:static;}
  .bb-flow{grid-template-columns:repeat(2,1fr);}
  .bb-banner-text h1{font-size:30px;}
}
@media (max-width:991px){
  .bb-sidebar{display:none;}
  .bb-topbar{display:flex;}
  .bb-main{margin-left:0;padding-top:60px;}
  .bb-banner{grid-template-columns:1fr;}
  .bb-banner-media{min-height:220px;order:-1;}
  .bb-banner-media::after{background:linear-gradient(180deg,rgba(247,245,239,0) 55%,rgba(247,245,239,.9) 100%);}
  .bb-banner-text{padding:30px 24px 32px;}
  .bb-banner-text h1{font-size:26px;}
  .bb-metrics{grid-template-columns:repeat(2,1fr);}
  .bb-metric:nth-child(2){border-right:0;}
  .bb-metric:nth-child(1),.bb-metric:nth-child(2){border-bottom:1px solid var(--bb-line);}
  .bb-cta-inner{grid-template-columns:1fr;padding:36px 24px;gap:24px;}
  .bb-footer-grid{grid-template-columns:1fr 1fr;gap:28px;padding:44px 24px 32px;}
  .bb-footer-bottom{padding:16px 24px 24px;}
}
@media (max-width:767px){
  body{font-size:16px;}
  .bb-container{padding:0 20px;}
  h1{font-size:26px;}
  h2{font-size:21px;}
  .bb-layout{padding-top:40px;}
  .bb-index-item{grid-template-columns:44px 1fr;gap:14px;padding:22px 10px 22px 0;}
  .bb-index-item:hover{padding-left:10px;}
  .bb-idx{width:40px;height:40px;font-size:15px;}
  .bb-flow{grid-template-columns:1fr;}
  .bb-footer-grid{grid-template-columns:1fr;}
  .bb-cta{margin-top:52px;}
}
@media (max-width:575px){
  .bb-container{padding:0 16px;}
  .bb-banner-text{padding:24px 18px 26px;}
  .bb-banner-actions{flex-direction:column;}
  .bb-banner-actions .bb-btn{width:100%;}
  .bb-metrics{grid-template-columns:1fr;}
  .bb-metric{border-right:0;border-bottom:1px solid var(--bb-line);}
  .bb-metric:last-child{border-bottom:0;}
  .bb-form{flex-direction:column;}
  .bb-form .bb-btn{width:100%;}
  .bb-card{padding:20px;}
}