/* roulang page: index */
:root{
  --brand:#1E4FD1; --brand-dark:#173FA8; --brand-soft:#E9F0FE; --brand-line:#CBDCFB;
  --accent:#FF7A29; --accent-dark:#E9641A; --accent-soft:#FFF1E7;
  --teal:#12A594;
  --bg:#F6F8FC; --surface:#FFFFFF; --surface-2:#F1F5FB;
  --text:#16202E; --text-2:#5A6B82; --text-3:#8A99AE;
  --line:#E6ECF5; --line-strong:#D7E1EF;
  --ok:#16A34A; --warn:#F59E0B; --err:#DC2626;
  --footer:#101E36;
  --radius-sm:12px; --radius:16px; --radius-lg:24px;
  --shadow-card:0 1px 2px rgba(16,32,60,.04),0 10px 28px -16px rgba(16,32,60,.20);
  --shadow-card-hover:0 14px 34px -14px rgba(16,32,60,.26);
  --shadow-btn:0 8px 20px -10px rgba(30,79,209,.55);
  --ease:200ms cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;line-height:28px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color var(--ease)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea{font:inherit}
::selection{background:var(--brand);color:#fff}
.num{font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.shell{max-width:1120px;margin:0 auto;padding-left:32px;padding-right:32px}
@media (max-width:1023px){.shell{padding-left:16px;padding-right:16px}}
.section{padding-top:88px;padding-bottom:88px}
@media (max-width:640px){.section{padding-top:56px;padding-bottom:56px}}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:var(--radius-sm);font-size:15px;font-weight:600;line-height:1;white-space:nowrap;transition:background-color var(--ease),color var(--ease),border-color var(--ease),box-shadow var(--ease),transform var(--ease)}
.btn-lg{height:48px;padding:0 26px;font-size:16px}
.btn-sm{height:36px;padding:0 16px;font-size:14px}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px -10px rgba(255,122,41,.6)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary:active{transform:translateY(1px)}
.btn-secondary{background:#fff;color:var(--brand);border:1px solid var(--line-strong)}
.btn-secondary:hover{border-color:var(--brand);background:#F7FAFF}
.btn-ghost{background:transparent;color:var(--brand)}
.btn-ghost:hover{background:var(--brand-soft)}
.btn-white{background:#fff;color:var(--brand);box-shadow:0 8px 20px -14px rgba(8,20,45,.5)}
.btn-white:hover{background:var(--brand-soft)}

/* 卡片 */
.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-card);transition:box-shadow var(--ease),transform var(--ease)}
.card-hover:hover{transform:translateY(-2px);box-shadow:var(--shadow-card-hover)}
.card-plain{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);transition:border-color var(--ease),box-shadow var(--ease),transform var(--ease)}
.card-plain:hover{border-color:var(--brand-line);box-shadow:var(--shadow-card)}
.thumb{overflow:hidden;border-radius:var(--radius-sm);background:var(--surface-2)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform 260ms ease-out}
.card-hover:hover .thumb img{transform:translateY(-2px)}

/* 徽章 */
.badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:12px;font-weight:600;line-height:1}
.badge-neutral{background:var(--surface-2);color:var(--text-2)}
.badge-teal{background:rgba(18,165,148,.12);color:var(--teal)}
.badge-accent{background:var(--accent-soft);color:var(--accent-dark)}

/* 侧栏导航 */
.nav-item{position:relative;display:flex;align-items:center;gap:10px;height:44px;padding:0 12px;border-radius:10px;color:var(--text-2);font-size:15px;transition:background-color var(--ease),color var(--ease)}
.nav-item svg{width:18px;height:18px;flex:none}
.nav-item:hover{background:var(--brand-soft);color:var(--brand)}
.nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.nav-item.active::before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:0 3px 3px 0;background:var(--brand)}
.drawer .nav-item{height:48px}

/* 轮播 */
.shot-track{display:flex;gap:24px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:8px;scrollbar-width:none}
.shot-track::-webkit-scrollbar{display:none}
.shot-frame{flex:0 0 auto;width:min(340px,78vw);scroll-snap-align:center}
@media (min-width:1024px){.shot-frame{width:calc((100% - 48px)/3)}}
.shot-track::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:999px}
.dot{width:8px;height:8px;border-radius:999px;background:var(--line-strong);transition:background-color var(--ease),width var(--ease)}
.dot.is-active{background:var(--brand);width:22px}
.arrow-btn{width:44px;height:44px;border-radius:999px;background:#fff;border:1px solid var(--line-strong);display:inline-flex;align-items:center;justify-content:center;color:var(--text-2);transition:background-color var(--ease),color var(--ease),border-color var(--ease)}
.arrow-btn:hover{background:var(--brand-soft);color:var(--brand);border-color:var(--brand-line)}

/* 时间轴 */
.timeline{position:relative}
.timeline::before{content:"";position:absolute;left:14px;top:34px;bottom:12px;width:1px;background:var(--line)}
.timeline-node{position:relative;display:flex;gap:16px;padding-bottom:28px}
.timeline-node:last-child{padding-bottom:0}
.timeline-dot{position:relative;z-index:1;flex:none;width:28px;height:28px;border-radius:999px;background:var(--brand);color:#fff;font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center}

/* FAQ */
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:0}
.faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;font-size:16px;font-weight:600;cursor:pointer;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{background:var(--surface-2)}
.faq-item .chev{flex:none;transition:transform 150ms ease-out;color:var(--text-3)}
.faq-item[open] .chev{transform:rotate(180deg);color:var(--brand)}
.faq-body{padding:0 24px 22px;font-size:15px;line-height:26px;color:var(--text-2)}

/* 装饰 */
.grid-tex{background-image:linear-gradient(rgba(30,79,209,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(30,79,209,.06) 1px,transparent 1px);background-size:28px 28px}
.dot-tex{background-image:radial-gradient(rgba(30,79,209,.16) 1px,transparent 1px);background-size:16px 16px}

/* 页脚 */
.footer-link{color:rgba(255,255,255,.65);font-size:14px;line-height:24px;transition:color var(--ease)}
.footer-link:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

/* 抽屉 */
.drawer{transition:transform 220ms ease-out}
.drawer.is-open{transform:translateX(0)}
.mask{transition:opacity 180ms ease-out}

/* 列表行 */
.post-row{transition:background-color var(--ease)}
.post-row:hover{background:var(--surface-2)}
.post-row:hover .post-title{color:var(--brand)}
.post-title{transition:color var(--ease)}

/* roulang page: article */
:root{
    --brand:#1E4FD1; --brand-dark:#173FA8; --brand-soft:#E9F0FE; --brand-line:#CBDCFB;
    --accent:#FF7A29; --accent-dark:#E9641A; --accent-soft:#FFF1E7;
    --teal:#12A594;
    --bg:#F6F8FC; --surface:#FFFFFF; --surface-2:#F1F5FB;
    --text:#16202E; --text-2:#5A6B82; --text-3:#8A99AE;
    --line:#E6ECF5; --line-strong:#D7E1EF;
    --ok:#16A34A; --warn:#F59E0B; --err:#DC2626;
    --footer:#101E36;
    --r-btn:12px; --r-card:16px; --r-panel:24px;
    --shadow-card:0 1px 2px rgba(16,32,60,.04), 0 10px 28px -16px rgba(16,32,60,.20);
    --shadow-hover:0 14px 34px -14px rgba(16,32,60,.26);
    --sidebar-w:240px;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--text);
    font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    font-size:16px;
    line-height:28px;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;}
  a{color:inherit;text-decoration:none;}
  button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
  h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
  ul{list-style:none;padding:0;}
  .tnum{font-variant-numeric:tabular-nums;}

  ::selection{background:var(--brand-soft);color:var(--brand-dark);}
  a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
    outline:2px solid var(--brand);outline-offset:2px;border-radius:8px;
  }
  ::-webkit-scrollbar{width:10px;height:10px;}
  ::-webkit-scrollbar-thumb{background:#D3DCEA;border-radius:999px;border:2px solid var(--bg);}
  ::-webkit-scrollbar-thumb:hover{background:#BCC9DC;}

  .shell{max-width:1120px;margin:0 auto;padding-left:20px;padding-right:20px;}
  @media (min-width:640px){.shell{padding-left:32px;padding-right:32px;}}

  /* ---------- App shell ---------- */
  .app-main{margin-left:0;min-height:100vh;}
  .sidebar{
    display:none;position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-w);
    background:var(--surface);border-right:1px solid var(--line);
    flex-direction:column;z-index:50;
  }
  @media (min-width:1024px){
    .sidebar{display:flex;}
    .app-main{margin-left:var(--sidebar-w);}
  }
  .sidebar-logo{
    height:72px;display:flex;align-items:center;gap:10px;
    padding:0 18px;border-bottom:1px solid var(--line);flex:none;
  }
  .logo-mark{
    width:36px;height:36px;border-radius:10px;flex:none;
    display:flex;align-items:center;justify-content:center;
    background:var(--brand);color:#fff;
    box-shadow:0 8px 20px -12px rgba(30,79,209,.75);
  }
  .nav-item{
    position:relative;display:flex;align-items:center;gap:10px;
    height:44px;padding:0 12px;border-radius:10px;
    font-size:15px;color:var(--text-2);
    transition:background-color .18s ease-out,color .18s ease-out;
  }
  .nav-item svg{width:18px;height:18px;flex:none;}
  .nav-item:hover{background:var(--brand-soft);color:var(--brand);}
  .nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600;}
  .nav-item.active::before{
    content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);
    width:3px;height:22px;border-radius:0 3px 3px 0;background:var(--brand);
  }
  .drawer .nav-item{height:48px;}

  /* ---------- Buttons ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:44px;padding:0 22px;border-radius:var(--r-btn);
    font-size:15px;font-weight:600;white-space:nowrap;
    transition:background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out,box-shadow .18s ease-out,transform .12s ease-out;
  }
  .btn-accent{background:var(--accent);color:#fff;box-shadow:0 8px 20px -10px rgba(233,100,26,.65);}
  .btn-accent:hover{background:var(--accent-dark);box-shadow:0 12px 24px -10px rgba(233,100,26,.72);}
  .btn-accent:active{transform:translateY(1px);}
  .btn-ghost{background:#fff;border:1px solid var(--line-strong);color:var(--brand);}
  .btn-ghost:hover{border-color:var(--brand);background:#F7FAFF;}
  .btn-sm{height:36px;padding:0 16px;font-size:14px;}

  /* ---------- Badges / cards ---------- */
  .badge{
    display:inline-flex;align-items:center;height:24px;padding:0 10px;
    border-radius:999px;font-size:12px;font-weight:500;line-height:1;
    background:var(--brand-soft);color:var(--brand);white-space:nowrap;
  }
  .badge-neutral{background:var(--surface-2);color:var(--text-2);}
  .card{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
    box-shadow:var(--shadow-card);
    transition:box-shadow .2s ease-out,transform .2s ease-out,border-color .2s ease-out;
  }
  .card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--brand-line);}
  .card-media{overflow:hidden;border-radius:var(--r-card) var(--r-card) 0 0;}

  /* ---------- Mobile bar & drawer ---------- */
  .mobile-bar{
    position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;
    gap:12px;height:56px;padding:0 12px;background:var(--surface);
    border-bottom:1px solid var(--line);transition:box-shadow .2s ease-out;
  }
  .mobile-bar.scrolled{box-shadow:0 8px 20px -14px rgba(16,32,60,.45);}
  .hamburger{
    width:44px;height:44px;display:flex;align-items:center;justify-content:center;
    border-radius:10px;color:var(--text-2);transition:background-color .18s,color .18s;
  }
  .hamburger:hover{background:var(--brand-soft);color:var(--brand);}
  .drawer{
    position:fixed;top:0;left:0;bottom:0;width:280px;z-index:60;
    background:var(--surface);display:flex;flex-direction:column;
    transform:translateX(-100%);transition:transform .22s ease-out;
    box-shadow:0 14px 34px -14px rgba(16,32,60,.35);
  }
  .drawer.open{transform:translateX(0);}
  .drawer-overlay{
    position:fixed;inset:0;z-index:55;background:rgba(16,30,54,.45);
    opacity:0;visibility:hidden;transition:opacity .22s ease-out,visibility .22s ease-out;
  }
  .drawer-overlay.show{opacity:1;visibility:visible;}

  /* ---------- Article body ---------- */
  .crumb{color:var(--brand);transition:color .18s ease-out;}
  .crumb:hover{color:var(--brand-dark);text-decoration:underline;text-underline-offset:3px;}

  .article-body{font-size:17px;line-height:32px;color:var(--text);word-break:break-word;}
  .article-body p{margin:0 0 20px;}
  .article-body h2{
    font-size:21px;line-height:32px;font-weight:600;color:var(--text);
    margin:38px 0 16px;padding-left:12px;border-left:4px solid var(--brand);
  }
  .article-body h3{font-size:18px;line-height:28px;font-weight:600;margin:26px 0 12px;}
  .article-body h4{font-size:16px;line-height:28px;font-weight:600;margin:22px 0 10px;color:var(--text-2);}
  .article-body ul,.article-body ol{margin:0 0 20px;}
  .article-body ul li{position:relative;padding-left:18px;margin-bottom:8px;line-height:30px;}
  .article-body ul li::before{
    content:"";position:absolute;left:2px;top:12px;width:6px;height:6px;
    border-radius:50%;background:var(--brand);
  }
  .article-body ol{counter-reset:item;padding-left:0;}
  .article-body ol li{position:relative;padding-left:30px;margin-bottom:10px;line-height:30px;counter-increment:item;}
  .article-body ol li::before{
    content:counter(item);position:absolute;left:0;top:3px;width:20px;height:20px;
    display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;
    color:#fff;background:var(--brand);border-radius:50%;line-height:1;
  }
  .article-body blockquote{
    margin:0 0 20px;padding:16px 20px;background:var(--surface-2);
    border-left:3px solid var(--brand);border-radius:0 12px 12px 0;
    font-size:15px;line-height:26px;color:var(--text-2);
  }
  .article-body blockquote p:last-child{margin-bottom:0;}
  .article-body a{color:var(--brand);text-decoration:underline;text-underline-offset:2px;}
  .article-body a:hover{color:var(--brand-dark);}
  .article-body img{border-radius:12px;margin:8px 0 8px;}
  .article-body figure{margin:20px 0;}
  .article-body figcaption{font-size:13px;line-height:22px;color:var(--text-3);text-align:center;margin-top:8px;}
  .article-body table{width:100%;border-collapse:collapse;margin:0 0 20px;font-size:15px;line-height:24px;}
  .article-body th,.article-body td{border:1px solid var(--line);padding:10px 14px;text-align:left;}
  .article-body thead th{background:var(--brand-soft);color:var(--brand);font-weight:600;}
  .article-body tbody tr:nth-child(even){background:var(--surface-2);}
  .article-body hr{border:0;border-top:1px solid var(--line);margin:28px 0;}
  .article-body code{
    background:var(--surface-2);border:1px solid var(--line);border-radius:6px;
    padding:1px 6px;font-size:14px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  }
  .article-body strong{font-weight:600;}

  /* ---------- Footer ---------- */
  .bg-footer{background:var(--footer);}
  .footer-link{
    font-size:14px;line-height:22px;color:rgba(255,255,255,.65);
    transition:color .18s ease-out;
  }
  .footer-link:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}

  .chip{
    display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 12px;
    border-radius:999px;background:var(--surface-2);color:var(--text-2);font-size:13px;
  }
  .dot-sep{width:4px;height:4px;border-radius:50%;background:var(--line-strong);display:inline-block;}

/* roulang page: category1 */
:root{
    --brand:#1E4FD1; --brand-dark:#173FA8; --brand-soft:#E9F0FE; --brand-line:#CBDCFB;
    --accent:#FF7A29; --accent-dark:#E9641A; --accent-soft:#FFF1E7;
    --teal:#12A594;
    --bg:#F6F8FC; --surface:#FFFFFF; --surface-2:#F1F5FB;
    --text:#16202E; --text-2:#5A6B82; --text-3:#8A99AE;
    --line:#E6ECF5; --line-strong:#D7E1EF;
    --ok:#16A34A; --warn:#F59E0B; --err:#DC2626;
    --footer:#101E36;
    --shadow-card:0 1px 2px rgba(16,32,60,.04), 0 10px 28px -16px rgba(16,32,60,.20);
    --shadow-hover:0 14px 34px -14px rgba(16,32,60,.26);
  }

  *{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  body{
    margin:0; background:var(--bg); color:var(--text); font-size:16px; line-height:28px;
    font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    -webkit-font-smoothing:antialiased;
  }
  img{display:block; max-width:100%;}
  a{color:inherit; text-decoration:none;}
  button{font:inherit; background:none; border:0; cursor:pointer; color:inherit;}
  h1,h2,h3,p,ul,ol,figure{margin:0; padding:0;}
  ul,ol{list-style:none;}
  :focus-visible{outline:2px solid var(--brand); outline-offset:2px; border-radius:8px;}
  ::selection{background:var(--brand-soft); color:var(--brand-dark);}
  .tnum{font-variant-numeric:tabular-nums;}

  .shell{width:100%; max-width:1120px; margin:0 auto; padding:0 16px;}
  @media (min-width:640px){ .shell{padding:0 24px;} }
  @media (min-width:1024px){ .shell{padding:0 32px;} }

  /* ============ App Shell ============ */
  .side{
    position:fixed; top:0; left:0; bottom:0; width:240px; background:#fff;
    border-right:1px solid var(--line); z-index:40; display:flex; flex-direction:column;
    transition:width .2s ease-out;
  }
  .side-head{
    height:72px; display:flex; align-items:center; gap:12px; padding:0 16px;
    border-bottom:1px solid var(--line); flex:none;
  }
  .side-nav{padding:12px;}
  .side-foot{padding:0 12px 16px;}
  .side-copy{padding:0 16px 18px; font-size:12px; line-height:18px; color:var(--text-3);}
  .main{margin-left:0; min-height:100vh; transition:margin-left .2s ease-out;}
  @media (max-width:1023px){ .side{display:none;} }
  @media (min-width:1024px){ .main{margin-left:240px;} }

  .nav-item{
    position:relative; display:flex; align-items:center; gap:10px; height:44px; padding:0 12px;
    border-radius:10px; font-size:15px; color:var(--text-2);
    transition:background .18s ease-out, color .18s ease-out;
  }
  .nav-item svg{width:18px; height:18px; flex:none;}
  .nav-item:hover{background:var(--brand-soft); color:var(--brand);}
  .nav-item.active{background:var(--brand-soft); color:var(--brand); font-weight:600;}
  .nav-item.active::before{
    content:""; position:absolute; left:0; top:10px; bottom:10px; width:3px;
    border-radius:3px; background:var(--brand);
  }

  @media (min-width:1280px){
    body.collapsed .side{width:88px;}
    body.collapsed .main{margin-left:88px;}
    body.collapsed .side .nav-text,
    body.collapsed .side .logo-text,
    body.collapsed .side .side-foot,
    body.collapsed .side .side-copy{display:none;}
    body.collapsed .side-head{flex-direction:column; height:auto; padding:14px 10px; gap:10px;}
    body.collapsed .side-nav{padding:10px;}
    body.collapsed .nav-item{justify-content:center; padding:0;}
    body.collapsed .nav-item::after{
      content:attr(data-tip); position:absolute; left:calc(100% + 10px); top:50%;
      transform:translateY(-50%); background:#101E36; color:#fff; font-size:12px;
      line-height:18px; padding:5px 10px; border-radius:8px; white-space:nowrap;
      opacity:0; pointer-events:none; transition:opacity .15s ease-out; z-index:60;
    }
    body.collapsed .nav-item:hover::after{opacity:1;}
  }

  /* ============ 移动端顶栏与抽屉 ============ */
  .mobile-bar{
    position:sticky; top:0; z-index:45; height:56px; display:flex; align-items:center;
    justify-content:space-between; gap:8px; padding:0 12px; background:#fff;
    border-bottom:1px solid var(--line); transition:box-shadow .18s ease-out;
  }
  .mobile-bar.scrolled{box-shadow:0 6px 18px -12px rgba(16,32,60,.35);}
  .mobile-bar .icon-btn{
    width:44px; height:44px; display:flex; align-items:center; justify-content:center;
    border-radius:10px; color:var(--text-2); transition:background .18s ease-out,color .18s ease-out;
  }
  .mobile-bar .icon-btn:hover{background:var(--brand-soft); color:var(--brand);}
  @media (min-width:1024px){ .mobile-bar{display:none;} }

  .overlay{
    position:fixed; inset:0; background:rgba(16,30,54,.45); z-index:50;
    opacity:0; pointer-events:none; transition:opacity .22s ease-out;
  }
  .overlay.show{opacity:1; pointer-events:auto;}
  .drawer{
    position:fixed; top:0; left:0; bottom:0; width:280px; background:#fff; z-index:60;
    transform:translateX(-100%); transition:transform .22s ease-out; display:flex; flex-direction:column;
  }
  .drawer.open{transform:none;}
  .drawer .nav-item{height:48px;}
  .drawer-head{
    height:72px; display:flex; align-items:center; gap:12px; padding:0 16px;
    border-bottom:1px solid var(--line); flex:none;
  }

  /* ============ 主内容 ============ */
  .main-pad{padding:24px 16px 56px;}
  @media (min-width:640px){ .main-pad{padding:28px 24px 64px;} }
  @media (min-width:1024px){ .main-pad{padding:32px 40px 96px;} }

  .page-hero{
    background-size:cover; background-position:center; border-bottom:1px solid var(--line);
  }
  .page-hero-inner{
    min-height:240px; display:flex; flex-direction:column; justify-content:center;
    gap:14px; padding-top:36px; padding-bottom:36px;
  }
  @media (min-width:1024px){ .page-hero-inner{min-height:272px; padding-top:44px; padding-bottom:44px;} }

  .section-gap{margin-top:56px;}
  @media (min-width:1024px){ .section-gap{margin-top:88px;} }

  /* ============ 组件 ============ */
  .btn{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    height:44px; padding:0 22px; border-radius:12px; font-size:15px; font-weight:600;
    border:1px solid transparent; transition:background .18s ease-out,color .18s ease-out,border-color .18s ease-out,box-shadow .18s ease-out,transform .12s ease-out;
  }
  .btn-primary{background:var(--accent); color:#fff; box-shadow:0 8px 20px -10px rgba(255,122,41,.6);}
  .btn-primary:hover{background:var(--accent-dark); box-shadow:0 12px 26px -12px rgba(233,100,26,.7);}
  .btn-primary:active{transform:translateY(1px);}
  .btn-secondary{background:#fff; border-color:var(--line-strong); color:var(--brand);}
  .btn-secondary:hover{border-color:var(--brand); background:#F7FAFF;}
  .btn-secondary:active{transform:translateY(1px);}
  .btn-sm{height:36px; padding:0 16px; font-size:14px; border-radius:10px;}

  .card{
    background:#fff; border:1px solid var(--line); border-radius:16px;
    transition:transform .18s ease-out, box-shadow .18s ease-out, border-color .18s ease-out;
  }
  .card:hover{transform:translateY(-2px); box-shadow:var(--shadow-hover); border-color:var(--line-strong);}

  .badge{
    display:inline-flex; align-items:center; height:24px; padding:0 10px; border-radius:999px;
    font-size:12px; font-weight:500; background:var(--brand-soft); color:var(--brand);
  }
  .badge-neutral{background:var(--surface-2); color:var(--text-2);}
  .badge-teal{background:#E6F7F4; color:#0E8577;}

  .icon-box{
    display:flex; align-items:center; justify-content:center; width:40px; height:40px;
    border-radius:12px; background:var(--brand-soft); color:var(--brand); flex:none;
  }
  .icon-box svg{width:20px; height:20px;}

  .step-num{
    display:flex; align-items:center; justify-content:center; width:28px; height:28px;
    border-radius:999px; background:var(--brand); color:#fff; font-size:13px; font-weight:600; flex:none;
  }
  .step-line{position:relative;}
  @media (max-width:767px){
    .step-line:not(:last-child)::after{
      content:""; position:absolute; left:14px; top:34px; bottom:2px; width:1px; background:var(--line);
    }
  }

  .dot{width:6px; height:6px; border-radius:999px; background:var(--brand); flex:none; margin-top:11px;}

  .footer-link{font-size:14px; line-height:22px; color:rgba(255,255,255,.65); transition:color .18s ease-out;}
  .footer-link:hover{color:#fff; text-decoration:underline; text-underline-offset:3px;}

/* roulang page: category2 */
:root{
    --brand:#1E4FD1; --brand-dark:#173FA8; --brand-soft:#E9F0FE; --brand-line:#CBDCFB;
    --accent:#FF7A29; --accent-dark:#E9641A; --accent-soft:#FFF1E7;
    --teal:#12A594;
    --bg:#F6F8FC; --surface:#FFFFFF; --surface-2:#F1F5FB;
    --text:#16202E; --text-2:#5A6B82; --text-3:#8A99AE;
    --line:#E6ECF5; --line-strong:#D7E1EF;
    --ok:#16A34A; --warn:#F59E0B; --err:#DC2626;
    --footer:#101E36;
    --radius-s:12px; --radius-m:16px; --radius-l:24px;
    --shadow-card:0 1px 2px rgba(16,32,60,.04), 0 10px 28px -16px rgba(16,32,60,.20);
    --shadow-card-hover:0 14px 34px -14px rgba(16,32,60,.26);
  }

  *,*::before,*::after{ box-sizing:border-box; }
  html{ -webkit-text-size-adjust:100%; }
  body{
    margin:0;
    background:var(--bg);
    color:var(--text);
    font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    font-size:16px;
    line-height:28px;
    -webkit-font-smoothing:antialiased;
  }
  img{ display:block; max-width:100%; }
  a{ color:inherit; text-decoration:none; }
  button{ font:inherit; }
  h1,h2,h3,h4,p{ margin:0; }
  ::selection{ background:var(--brand-soft); color:var(--brand-dark); }
  :focus-visible{ outline:2px solid var(--brand); outline-offset:2px; border-radius:6px; }

  .shell{ width:100%; max-width:1120px; margin:0 auto; padding-left:32px; padding-right:32px; }

  /* 侧栏 App Shell */
  .sidebar{
    position:fixed; top:0; left:0; z-index:50;
    width:240px; height:100vh;
    display:flex; flex-direction:column;
    background:var(--surface);
    border-right:1px solid var(--line);
    transform:translateX(-100%);
    transition:transform .22s ease-out;
  }
  .sidebar.open{ transform:translateX(0); }
  .sidebar-scroll{ flex:1; overflow-y:auto; }
  .sidebar-scroll::-webkit-scrollbar{ width:6px; }
  .sidebar-scroll::-webkit-scrollbar-thumb{ background:var(--line-strong); border-radius:99px; }

  .nav-item{
    position:relative;
    display:flex; align-items:center; gap:12px;
    height:44px; padding:0 12px; border-radius:10px;
    font-size:15px; color:var(--text-2);
    transition:background-color .18s ease-out, color .18s ease-out;
  }
  .nav-item svg{ width:18px; height:18px; flex:none; }
  .nav-item:hover{ background:var(--brand-soft); color:var(--brand); }
  .nav-item.active{ background:var(--brand-soft); color:var(--brand); font-weight:600; }
  .nav-item.active::before{
    content:""; position:absolute; left:0; top:10px; bottom:10px; width:3px;
    border-radius:99px; background:var(--brand);
  }

  /* 移动端顶栏 */
  .topbar{
    position:fixed; top:0; left:0; right:0; z-index:30;
    height:56px; display:flex; align-items:center; gap:8px;
    background:rgba(255,255,255,.96);
    border-bottom:1px solid var(--line);
    padding:0 12px;
    transition:box-shadow .18s ease-out;
  }
  .topbar.scrolled{ box-shadow:0 8px 20px -16px rgba(16,32,60,.45); }
  .icon-btn{
    width:44px; height:44px; display:inline-flex; align-items:center; justify-content:center;
    border-radius:var(--radius-s); color:var(--text-2); background:transparent; border:0; cursor:pointer;
    transition:background-color .18s ease-out, color .18s ease-out;
  }
  .icon-btn:hover{ background:var(--brand-soft); color:var(--brand); }

  .overlay{
    position:fixed; inset:0; z-index:40;
    background:rgba(16,30,54,.45);
    opacity:0; pointer-events:none;
    transition:opacity .2s ease-out;
  }
  .overlay.show{ opacity:1; pointer-events:auto; }

  .main-area{ padding-top:56px; }
  .page{ padding-top:16px; }

  /* 按钮 */
  .btn{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    height:44px; padding:0 22px; border-radius:var(--radius-s);
    font-size:15px; font-weight:600; line-height:1;
    border:1px solid transparent; cursor:pointer;

    transition:background-color .18s ease-out, color .18s ease-out, border-color .18s ease-out, transform .18s ease-out, box-shadow .18s ease-out;
  }
  .btn-primary{ background:var(--accent); color:#fff; box-shadow:0 8px 20px -10px rgba(255,122,41,.65); }
  .btn-primary:hover{ background:var(--accent-dark); transform:translateY(-1px); }
  .btn-primary:active{ transform:translateY(1px); box-shadow:none; }
  .btn-secondary{ background:#fff; border-color:var(--line-strong); color:var(--brand); }
  .btn-secondary:hover{ border-color:var(--brand); background:#F7FAFF; }
  .btn-light{ background:#fff; color:var(--brand); border-color:var(--brand-line); }
  .btn-light:hover{ background:var(--brand-soft); border-color:var(--brand); }
  .btn-sm{ height:36px; padding:0 16px; font-size:14px; }
  .btn-block{ width:100%; }

  /* 页面头部 */
  .banner{
    position:relative; overflow:hidden;
    border-radius:var(--radius-l);
    min-height:260px;
    display:flex; align-items:center;
    padding:44px 40px;
    background-image:
      linear-gradient(90deg, rgba(255,255,255,.95) 0%, rgba(255,255,255,.78) 48%, rgba(255,255,255,.30) 100%),
      linear-gradient(rgba(30,79,209,.10), rgba(30,79,209,.10)),
      url('/assets/images/backpic/back-2.webp');
    background-size:cover, cover, cover;
    background-position:center, center, center;
    border:1px solid var(--line);
  }
  .breadcrumb{ display:flex; align-items:center; flex-wrap:wrap; gap:8px; font-size:13px; color:var(--text-2); }
  .breadcrumb a{ color:var(--text-2); transition:color .18s ease-out; }
  .breadcrumb a:hover{ color:var(--brand); }
  .breadcrumb .sep{ color:var(--text-3); }
  .breadcrumb .current{ color:var(--text-3); }

  .h1{ font-size:26px; line-height:36px; font-weight:700; letter-spacing:-.2px; }
  .sec-title{ font-size:22px; line-height:32px; font-weight:700; }
  .sec-sub{ margin-top:8px; font-size:15px; line-height:26px; color:var(--text-2); max-width:760px; }
  .t2{ color:var(--text-2); }
  .t3{ color:var(--text-3); }

  /* 入口卡片 */
  .entry-card{
    position:relative; overflow:hidden;
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-m);
    transition:transform .18s ease-out, box-shadow .18s ease-out, border-color .18s ease-out;
  }
  .entry-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow-card-hover); border-color:var(--brand-line); }
  .entry-media{ overflow:hidden; border-radius:var(--radius-m) var(--radius-m) 0 0; background:var(--surface-2); }
  .entry-media img{ width:100%; aspect-ratio:16/9; object-fit:cover; }
  .entry-index{
    position:absolute; top:16px; left:16px;
    min-width:34px; height:26px; padding:0 9px;
    display:inline-flex; align-items:center; justify-content:center;
    border-radius:99px; background:var(--brand); color:#fff;
    font-size:12px; font-weight:700;
    font-variant-numeric:tabular-nums;
    transition:background-color .18s ease-out;
  }
  .entry-card:hover .entry-index{ background:var(--accent); }
  .entry-body{ padding:22px 24px 24px; }
  .entry-body h3{ font-size:18px; line-height:28px; font-weight:600; }
  .entry-body p{ margin-top:10px; font-size:14px; line-height:24px; color:var(--text-2); }
  .link-arrow{
    display:inline-flex; align-items:center; gap:6px;
    margin-top:14px; font-size:14px; font-weight:600; color:var(--brand);
    transition:color .18s ease-out, gap .18s ease-out;
  }
  .link-arrow:hover{ color:var(--brand-dark); gap:10px; }

  /* 检查清单卡 */
  .info-card{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-m);
    padding:22px;
    transition:transform .18s ease-out, box-shadow .18s ease-out;
  }
  .info-card:hover{ transform:translateY(-2px); box-shadow:var(--shadow-card-hover); }
  .info-label{ font-size:12px; line-height:18px; color:var(--text-3); letter-spacing:.4px; }
  .info-value{ margin-top:6px; font-size:16px; line-height:26px; font-weight:600; font-variant-numeric:tabular-nums; }
  .info-desc{ margin-top:6px; font-size:14px; line-height:24px; color:var(--text-2); }

  /* 步骤时间轴 */
  .step{ position:relative; padding-left:48px; }
  .step + .step{ margin-top:26px; }
  .step-no{
    position:absolute; left:0; top:0;
    width:28px; height:28px; border-radius:50%;
    display:flex; align-items:center; justify-content:center;
    background:var(--brand); color:#fff;
    font-size:12px; font-weight:700; font-variant-numeric:tabular-nums;
  }
  .step::after{
    content:""; position:absolute; left:13.5px; top:32px; bottom:-22px; width:1px; background:var(--line);
  }
  .step:last-child::after{ display:none; }
  .step h3{ font-size:15px; line-height:24px; font-weight:600; }
  .step p{ margin-top:4px; font-size:14px; line-height:24px; color:var(--text-2); }

  /* 安全提示 */
  .tip{
    display:flex; gap:14px;
    padding:20px;
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-m);
    transition:transform .18s ease-out, box-shadow .18s ease-out;
  }
  .tip:hover{ transform:translateY(-2px); box-shadow:var(--shadow-card-hover); }
  .tip-icon{
    flex:none; width:36px; height:36px; border-radius:10px;
    display:flex; align-items:center; justify-content:center;
    background:rgba(18,165,148,.10); color:var(--teal);
  }
  .tip h3{ font-size:16px; line-height:26px; font-weight:600; }
  .tip p{ margin-top:4px; font-size:14px; line-height:24px; color:var(--text-2); }

  /* FAQ */
  .faq-wrap{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-m);
    padding:4px 24px;
  }
  .faq-item{ border-bottom:1px solid var(--line); }
  .faq-item:last-child{ border-bottom:0; }
  .faq-item summary{
    display:flex; align-items:center; justify-content:space-between; gap:16px;
    padding:18px 0; cursor:pointer; list-style:none;
    font-size:16px; line-height:26px; font-weight:600; color:var(--text);
    transition:color .18s ease-out;
  }
  .faq-item summary::-webkit-details-marker{ display:none; }
  .faq-item summary:hover{ color:var(--brand); }
  .faq-item .chev{ flex:none; color:var(--text-3); transition:transform .15s ease-out, color .15s ease-out; }
  .faq-item[open] .chev{ transform:rotate(180deg); color:var(--brand); }
  .faq-answer{ max-height:0; overflow:hidden; transition:max-height .22s ease-out; }
  .faq-item[open] .faq-answer{ max-height:320px; }
  .faq-answer p{ padding:0 0 18px; font-size:15px; line-height:28px; color:var(--text-2); }

  /* CTA */
  .cta-panel{
    background:var(--brand-soft);
    border:1px solid var(--brand-line);
    border-radius:var(--radius-m);
    padding:28px 32px;
    display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:20px;
  }
  .cta-panel h2{ font-size:20px; line-height:30px; font-weight:700; }
  .cta-panel p{ margin-top:6px; font-size:14px; line-height:24px; color:var(--text-2); }

  .link-inline{ color:var(--brand); font-size:14px; font-weight:600; text-decoration:underline; text-underline-offset:3px; }
  .link-inline:hover{ color:var(--brand-dark); }

  /* 页脚 */
  .bg-footer{ background:var(--footer); }
  .footer-link{ font-size:14px; line-height:24px; color:rgba(255,255,255,.65); transition:color .18s ease-out; }
  .footer-link:hover{ color:#fff; text-decoration:underline; text-underline-offset:3px; }

  /* 颜色工具（Tailwind CDN 失效时回退） */
  .bg-brand{ background-color:var(--brand); }
  .bg-brand-soft{ background-color:var(--brand-soft); }
  .bg-surface-2{ background-color:var(--surface-2); }
  .text-brand{ color:var(--brand); }

  @media (max-width:1023px){
    .page{ padding-bottom:8px; }
  }
  @media (min-width:640px){
    .page{ padding-top:24px; }
    .h1{ font-size:30px; line-height:40px; }
  }
  @media (min-width:1024px){
    .sidebar{ transform:translateX(0); }
    .topbar{ display:none; }
    .main-area{ margin-left:240px; padding-top:0; }
    .page{ padding-top:32px; }
    .h1{ font-size:34px; line-height:44px; }
    .sec-title{ font-size:24px; line-height:34px; }
  }
  @media (max-width:640px){
    .shell{ padding-left:16px; padding-right:16px; }
    .banner{ padding:28px 20px; min-height:240px; border-radius:var(--radius-m); }
    .entry-body{ padding:18px 18px 20px; }
    .cta-panel{ padding:22px 20px; }
    .faq-wrap{ padding:4px 18px; }
  }

/* roulang page: category3 */
:root{
    --brand:#1E4FD1;--brand-dark:#173FA8;--brand-soft:#E9F0FE;--brand-line:#CBDCFB;
    --accent:#FF7A29;--accent-dark:#E9641A;--accent-soft:#FFF1E7;
    --teal:#12A594;
    --bg:#F6F8FC;--surface:#FFFFFF;--surface-2:#F1F5FB;
    --text:#16202E;--text-2:#5A6B82;--text-3:#8A99AE;
    --line:#E6ECF5;--line-strong:#D7E1EF;
    --ok:#16A34A;--warn:#F59E0B;--err:#DC2626;
    --footer:#101E36;
    --shadow-card:0 1px 2px rgba(16,32,60,.04),0 10px 28px -16px rgba(16,32,60,.20);
    --shadow-hover:0 14px 34px -14px rgba(16,32,60,.26);
    --shadow-accent:0 8px 20px -10px rgba(30,79,209,.55);
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%}
  body{
    margin:0;background:var(--bg);color:var(--text);
    font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    font-size:16px;line-height:28px;-webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;border:0}
  a{color:inherit;text-decoration:none}
  button{font:inherit;border:0;background:none;cursor:pointer}
  summary{list-style:none;cursor:pointer}
  summary::-webkit-details-marker{display:none}
  ::selection{background:var(--brand-soft);color:var(--brand-dark)}
  :focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:8px}
  .shell{width:100%;max-width:1120px;margin:0 auto;padding-left:16px;padding-right:16px}
  @media (min-width:768px){.shell{padding-left:32px;padding-right:32px}}
  .num{font-variant-numeric:tabular-nums}

  /* 侧栏导航 */
  .nav-item{
    position:relative;display:flex;align-items:center;gap:12px;height:44px;padding:0 12px;
    border-radius:10px;font-size:15px;color:var(--text-2);
    transition:background-color .16s ease-out,color .16s ease-out;
  }
  .nav-item svg{width:18px;height:18px;flex:none}
  .nav-item:hover{background:var(--brand-soft);color:var(--brand)}
  .nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
  .nav-item.active::before{
    content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--brand);
  }
  .drawer .nav-item{height:48px}

  /* 按钮 */
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;
    border-radius:12px;font-size:15px;font-weight:600;white-space:nowrap;
    transition:background-color .16s ease-out,color .16s ease-out,border-color .16s ease-out,transform .16s ease-out,box-shadow .16s ease-out;}
  .btn:active{transform:translateY(1px)}
  .btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px -12px rgba(233,100,26,.7)}
  .btn-primary:hover{background:var(--accent-dark);box-shadow:0 12px 24px -12px rgba(233,100,26,.75)}
  .btn-secondary{background:#fff;color:var(--brand);border:1px solid var(--line-strong)}
  .btn-secondary:hover{border-color:var(--brand);background:#F7FAFF}
  .btn-white{background:#fff;color:var(--brand);border:1px solid var(--brand-line);height:40px;padding:0 18px;font-size:14px}
  .btn-white:hover{background:var(--brand-soft)}
  .btn-sm{height:36px;padding:0 18px;font-size:14px}
  .btn-lg{height:48px;padding:0 26px}

  /* 徽章与标签 */
  .badge{display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 10px;border-radius:999px;
    font-size:12px;line-height:1;background:var(--brand-soft);color:var(--brand);font-weight:500}
  .badge-teal{background:#E6F6F3;color:#0E8A7C}
  .badge-accent{background:var(--accent-soft);color:var(--accent-dark)}
  .badge-neutral{background:var(--surface-2);color:var(--text-2)}
  .chip{display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 10px;border-radius:8px;
    font-size:12px;background:var(--surface-2);color:var(--text-2);border:1px solid var(--line)}
  .chip svg{width:13px;height:13px;color:var(--teal)}

  /* 清单流 */
  .list-stack{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}
  .row-item{display:grid;grid-template-columns:1fr;gap:20px;padding:24px;transition:background-color .16s ease-out}
  .row-item + .row-item{border-top:1px solid var(--line)}
  .row-item:hover{background:var(--surface-2)}
  .row-title{transition:color .16s ease-out}
  .row-item:hover .row-title{color:var(--brand)}
  @media (min-width:768px){
    .row-item{grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:28px;padding:28px}
  }
  .thumb{position:relative;overflow:hidden;border-radius:12px;background:var(--surface-2);aspect-ratio:16/10}
  .thumb img{width:100%;height:100%;object-fit:cover}
  .thumb-tag{position:absolute;left:12px;top:12px;display:inline-flex;align-items:center;justify-content:center;
    min-width:32px;height:26px;padding:0 9px;border-radius:8px;background:rgba(255,255,255,.94);
    color:var(--brand);font-size:12px;font-weight:600}

  /* 速查卡 */
  .mini-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;
    transition:transform .16s ease-out,box-shadow .16s ease-out,border-color .16s ease-out}
  .mini-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--brand-line)}
  .icon-box{width:40px;height:40px;border-radius:12px;background:var(--brand-soft);color:var(--brand);
    display:flex;align-items:center;justify-content:center}
  .icon-box svg{width:20px;height:20px}

  /* 时间轴 */
  .step{position:relative;padding-left:44px;padding-bottom:28px}
  .step:last-child{padding-bottom:0}
  .step::before{content:"";position:absolute;left:13px;top:28px;bottom:0;width:1px;background:var(--line)}
  .step:last-child::before{display:none}
  .step-num{position:absolute;left:0;top:0;width:28px;height:28px;border-radius:999px;background:var(--brand);
    color:#fff;font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center}

  /* FAQ */
  .faq-item + .faq-item{border-top:1px solid var(--line)}
  .faq-arrow{width:20px;height:20px;color:var(--text-3);flex:none;transition:transform .16s ease-out,color .16s ease-out}
  .faq-item[open] .faq-arrow{transform:rotate(180deg);color:var(--brand)}
  .faq-body{animation:faqIn .18s ease-out}
  @keyframes faqIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}

  .link-brand{color:var(--brand);font-size:14px;text-decoration:underline;text-underline-offset:2px;transition:color .16s ease-out}
  .link-brand:hover{color:var(--brand-dark)}

  .footer-link{font-size:14px;line-height:26px;color:rgba(255,255,255,.65);transition:color .16s ease-out}
  .footer-link:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

  .topbar{transition:box-shadow .18s ease-out}
  .topbar.scrolled{box-shadow:0 6px 18px -12px rgba(16,32,60,.35)}
  .drawer{transform:translateX(-100%);transition:transform .2s ease-out}
  .drawer.open{transform:translateX(0)}
  .mask{opacity:0;visibility:hidden;transition:opacity .2s ease-out,visibility .2s ease-out}
  .mask.open{opacity:1;visibility:visible}

/* roulang page: category4 */
:root{
    --brand:#1E4FD1; --brand-dark:#173FA8; --brand-soft:#E9F0FE; --brand-line:#CBDCFB;
    --accent:#FF7A29; --accent-dark:#E9641A; --accent-soft:#FFF1E7;
    --teal:#12A594;
    --bg:#F6F8FC; --surface:#FFFFFF; --surface-2:#F1F5FB;
    --text:#16202E; --text-2:#5A6B82; --text-3:#8A99AE;
    --line:#E6ECF5; --line-strong:#D7E1EF;
    --ok:#16A34A; --warn:#F59E0B; --err:#DC2626;
    --footer:#101E36;
    --shadow-card:0 1px 2px rgba(16,32,60,.04), 0 10px 28px -16px rgba(16,32,60,.20);
    --shadow-hover:0 14px 34px -14px rgba(16,32,60,.26);
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%}
  body{
    margin:0; background:var(--bg); color:var(--text);
    font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    font-size:16px; line-height:28px; -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none}
  button{font-family:inherit}
  :focus-visible{outline:2px solid var(--brand);outline-offset:2px}
  ::selection{background:var(--brand-soft);color:var(--brand-dark)}
  ::-webkit-scrollbar{width:10px;height:10px}
  ::-webkit-scrollbar-thumb{background:#CBD6E6;border-radius:999px;border:3px solid transparent;background-clip:content-box}
  ::-webkit-scrollbar-track{background:transparent}

  .shell{width:100%;max-width:1120px;margin:0 auto;padding:0 16px}
  @media (min-width:1024px){ .shell{padding:0 32px} }
  .t2{color:var(--text-2)} .t3{color:var(--text-3)}
  .num{font-variant-numeric:tabular-nums}

  /* ---------- App Shell ---------- */
  .app-rail{
    position:fixed;top:0;left:0;bottom:0;width:240px;background:#fff;
    border-right:1px solid var(--line);z-index:50;display:none;flex-direction:column;
    transition:width .22s ease-out;
  }
  .app-main{padding-top:56px}
  @media (min-width:1024px){
    .app-rail{display:flex}
    .app-main{padding-top:0;padding-left:240px;transition:padding-left .22s ease-out}
    body.rail-collapsed .app-rail{width:88px}
    body.rail-collapsed .app-main{padding-left:88px}
    body.rail-collapsed .rail-label{display:none}
    body.rail-collapsed .rail-head{justify-content:center;padding-left:0;padding-right:0}
    body.rail-collapsed .nav-item{justify-content:center;padding:0}
    body.rail-collapsed .rail-foot{padding-left:10px;padding-right:10px}
  }
  .nav-item{
    position:relative;display:flex;align-items:center;gap:10px;height:44px;padding:0 12px;
    border-radius:10px;font-size:15px;color:var(--text-2);
    transition:background-color .18s ease-out,color .18s ease-out;
  }
  .nav-item svg{width:18px;height:18px;flex:none}
  .nav-item:hover{background:var(--brand-soft);color:var(--brand)}
  .nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
  .nav-item.active::before{
    content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;
    border-radius:0 3px 3px 0;background:var(--brand);
  }
  .rail-toggle{
    display:none;position:absolute;right:10px;top:22px;width:28px;height:28px;
    align-items:center;justify-content:center;border-radius:8px;border:1px solid var(--line);
    background:#fff;color:var(--text-3);transition:color .18s ease-out,border-color .18s ease-out;
  }
  .rail-toggle:hover{color:var(--brand);border-color:var(--brand-line)}
  @media (min-width:1024px){ .rail-toggle{display:flex} }
  body.rail-collapsed .rail-toggle{right:30px}

  /* ---------- 移动端顶栏与抽屉 ---------- */
  .mobile-topbar{
    position:fixed;top:0;left:0;right:0;height:56px;background:#fff;z-index:45;
    border-bottom:1px solid var(--line);
  }
  .mobile-topbar.scrolled{box-shadow:0 6px 18px -14px rgba(16,32,60,.5)}
  .drawer{
    position:fixed;top:0;bottom:0;left:0;width:280px;background:#fff;z-index:60;
    transform:translateX(-100%);transition:transform .22s ease-out;display:flex;flex-direction:column;
    box-shadow:0 20px 60px -24px rgba(16,32,60,.4);
  }
  .drawer.is-open{transform:translateX(0)}
  .drawer-mask{
    position:fixed;inset:0;background:rgba(16,30,54,.45);z-index:55;
    opacity:0;visibility:hidden;transition:opacity .22s ease-out,visibility .22s;
  }
  .drawer-mask.is-open{opacity:1;visibility:visible}
  .drawer .nav-item{height:48px}
  @media (min-width:1024px){
    .drawer,.drawer-mask,.mobile-topbar{display:none!important}
  }

  /* ---------- 按钮 ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;
    padding:0 22px;border-radius:12px;font-size:15px;font-weight:600;border:1px solid transparent;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out,box-shadow .18s ease-out,transform .12s ease-out;
    cursor:pointer;white-space:nowrap;
  }
  .btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px -10px rgba(255,122,41,.6)}
  .btn-primary:hover{background:var(--accent-dark);box-shadow:0 12px 26px -12px rgba(233,100,26,.65)}
  .btn-primary:active{transform:translateY(1px)}
  .btn-secondary{background:#fff;color:var(--brand);border-color:var(--line-strong)}
  .btn-secondary:hover{border-color:var(--brand);background:#F7FAFF}
  .btn-ghost{background:transparent;color:var(--brand)}
  .btn-ghost:hover{background:var(--brand-soft)}
  .btn-sm{height:36px;padding:0 16px;font-size:14px;border-radius:10px}
  .btn-lg{height:48px;padding:0 26px}
  .btn-block{width:100%}

  /* ---------- 卡片与徽章 ---------- */
  .card{
    background:var(--surface);border:1px solid var(--line);border-radius:16px;
    box-shadow:var(--shadow-card);
    transition:box-shadow .18s ease-out,transform .18s ease-out;
  }
  .card-hover:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
  .badge{
    display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 10px;border-radius:999px;
    font-size:12px;line-height:1;background:var(--brand-soft);color:var(--brand);font-weight:500;
  }
  .badge-neutral{background:var(--surface-2);color:var(--text-2)}
  .badge-teal{background:rgba(18,165,148,.12);color:#0E8074}
  .badge-accent{background:var(--accent-soft);color:var(--accent-dark)}
  .icon-box{
    display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;
    border-radius:12px;background:var(--brand-soft);color:var(--brand);flex:none;
  }
  .icon-box svg{width:20px;height:20px}
  .link-more{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand)}
  .link-more svg{width:16px;height:16px;transition:transform .18s ease-out}
  .link-more:hover{color:var(--brand-dark)}
  .link-more:hover svg{transform:translateX(3px)}
  .rule{height:1px;background:var(--line);border:0;margin:0}

  /* ---------- 页头 ---------- */
  .cat-hero{
    position:relative;overflow:hidden;
    background-image:linear-gradient(180deg,rgba(30,79,209,.14) 0%,rgba(30,79,209,.08) 42%,rgba(246,248,252,.96) 100%),
      url('/assets/images/backpic/back-3.png');
    background-size:cover;background-position:center;
  }
  .cat-hero .grain{
    position:absolute;inset:0;opacity:.35;pointer-events:none;
    background-image:radial-gradient(rgba(30,79,209,.18) 1px,transparent 1px);
    background-size:22px 22px;
  }

  /* ---------- FAQ ---------- */
  .faq-wrap{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-card);max-width:820px}
  .faq-item + .faq-item{border-top:1px solid var(--line)}
  .faq-q{
    width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
    padding:20px 24px;background:none;border:0;text-align:left;cursor:pointer;
    font-size:16px;font-weight:600;color:var(--text);transition:background-color .18s ease-out,color .18s ease-out;
  }
  .faq-q:hover{background:var(--surface-2)}
  .faq-item.is-open .faq-q{color:var(--brand)}
  .faq-arrow{width:20px;height:20px;flex:none;color:var(--text-3);transition:transform .15s ease-out,color .15s ease-out}
  .faq-item.is-open .faq-arrow{transform:rotate(180deg);color:var(--brand)}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .24s ease-out}
  .faq-a-inner{padding:0 24px 20px;font-size:15px;line-height:26px;color:var(--text-2)}
  @media (max-width:640px){
    .faq-q{padding:16px 16px;font-size:15px}
    .faq-a-inner{padding:0 16px 16px;font-size:14.5px}
  }

  /* ---------- 流程 ---------- */
  .step-line{position:relative;padding-left:52px}
  .step-line::before{
    content:"";position:absolute;left:13px;top:30px;bottom:-8px;width:1px;background:var(--line);
  }
  .step-line:last-child::before{display:none}
  .step-dot{
    position:absolute;left:0;top:0;width:28px;height:28px;border-radius:999px;
    background:var(--brand);color:#fff;font-size:13px;font-weight:600;
    display:flex;align-items:center;justify-content:center;
  }

  /* ---------- 页脚 ---------- */
  .footer-link{color:rgba(255,255,255,.65);font-size:14px;transition:color .18s ease-out}
  .footer-link:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

  .ratio-16x9{aspect-ratio:16/9;overflow:hidden;border-radius:12px}
  .ratio-4x3{aspect-ratio:4/3;overflow:hidden;border-radius:12px}
  .ratio-16x9 img,.ratio-4x3 img{width:100%;height:100%;object-fit:cover}

  @media (prefers-reduced-motion:reduce){
    *{transition-duration:.01ms!important;animation-duration:.01ms!important}
  }