/* roulang page: index */
:root{
  --ink:#0E1412;
  --ink-soft:#1C2421;
  --line-ink:rgba(255,255,255,.10);
  --sand:#F7F5F0;
  --paper:#FFFFFF;
  --line:#E5E1D9;
  --muted:#7C837F;
  --signal:#FF5A1F;
  --signal-soft:#FFE9DF;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --shadow-1:0 1px 2px rgba(14,20,18,.05),0 10px 24px -14px rgba(14,20,18,.20);
  --shadow-2:0 2px 4px rgba(14,20,18,.06),0 18px 38px -18px rgba(14,20,18,.28);
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--sand);
  color:var(--ink);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input{font:inherit;color:inherit;}
h1,h2,h3,h4{margin:0;letter-spacing:-0.01em;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:6px;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

/* ---------- App shell ---------- */
.sidebar{
  position:fixed;left:0;top:0;bottom:0;width:248px;
  background:var(--ink);color:#fff;
  display:flex;flex-direction:column;
  padding:28px 20px 24px;
  border-right:1px solid var(--line-ink);
  z-index:60;
}
.brand{display:flex;align-items:center;gap:10px;padding:0 8px 22px;}
.brand-mark{width:26px;height:26px;flex:0 0 26px;}
.brand-text{font-size:16px;font-weight:800;letter-spacing:.01em;line-height:1.3;}
.brand-sub{display:block;font-size:11px;font-weight:400;color:rgba(255,255,255,.5);letter-spacing:.06em;}
.nav-group{display:flex;flex-direction:column;gap:4px;}
.nav-item{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  gap:10px;padding:11px 12px 11px 14px;border-radius:10px;
  color:rgba(255,255,255,.7);font-size:14.5px;font-weight:500;
  transition:color .14s var(--ease),background-color .14s var(--ease);
}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.06);}
.nav-item.active{color:#fff;background:var(--ink-soft);font-weight:600;}
.nav-item.active::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:2px;
  background:var(--signal);border-radius:2px;
}
.nav-item .arrow{font-size:12px;color:rgba(255,255,255,.45);}
.nav-item:hover .arrow{color:var(--signal);}
.side-sep{height:1px;background:var(--line-ink);margin:20px 8px;}
.side-foot{margin-top:auto;display:flex;flex-direction:column;gap:10px;padding-top:18px;}
.side-note{font-size:12px;color:rgba(255,255,255,.45);line-height:1.7;padding:0 8px;}
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--ink);color:#fff;border:1px solid var(--ink);
  border-radius:var(--r-btn);padding:12px 20px;font-size:14.5px;font-weight:600;
  cursor:pointer;transition:background-color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease),box-shadow .16s var(--ease);
}
.btn-primary:hover{background:var(--signal);border-color:var(--signal);transform:translateY(-2px);box-shadow:var(--shadow-2);}
.btn-primary:active{transform:translateY(0);}
.side-foot .btn-primary{width:100%;background:var(--signal);border-color:var(--signal);}
.side-foot .btn-primary:hover{background:#ff6f39;border-color:#ff6f39;}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:#fff;border:1px solid rgba(255,255,255,.28);
  border-radius:var(--r-btn);padding:11px 20px;font-size:14.5px;font-weight:500;
  cursor:pointer;transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn-ghost:hover{background:#fff;color:var(--ink);border-color:#fff;transform:translateY(-2px);}
.btn-outline{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:var(--ink);border:1px solid var(--ink);
  border-radius:var(--r-btn);padding:12px 22px;font-size:14.5px;font-weight:600;
  cursor:pointer;transition:background-color .16s var(--ease),color .16s var(--ease),transform .16s var(--ease);
}
.btn-outline:hover{background:var(--ink);color:#fff;transform:translateY(-2px);}
.link-more{
  color:var(--signal);font-size:14px;font-weight:600;
  transition:color .14s var(--ease);
}
.link-more:hover{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:2px;}

/* topbar + drawer */
.topbar{
  display:none;position:sticky;top:0;z-index:70;height:56px;
  background:var(--ink);color:#fff;align-items:center;justify-content:space-between;
  padding:0 16px;
}
.topbar .brand{padding:0;}
.hamburger{
  width:38px;height:38px;border-radius:10px;border:1px solid rgba(255,255,255,.22);
  background:transparent;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;cursor:pointer;
}
.hamburger span{display:block;width:16px;height:2px;background:#fff;border-radius:2px;}
.drawer-mask{
  display:none;position:fixed;inset:0;background:rgba(14,20,18,.5);z-index:80;opacity:0;transition:opacity .24s var(--ease);
}
.drawer-mask.show{display:block;opacity:1;}
.drawer-mask .drawer{opacity:1;}

/* ---------- main ---------- */
.app-main{margin-left:248px;min-height:100vh;display:flex;flex-direction:column;}
.wrap{width:100%;max-width:1280px;margin:0 auto;padding:0 40px;}
main{flex:1;}
.section{padding:96px 0;}
.section:first-child{padding-top:56px;}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:32px;}
.section-head h2{font-size:clamp(24px,3vw,36px);font-weight:700;line-height:1.25;}
.section-head .sub{margin-top:8px;color:var(--muted);font-size:14.5px;max-width:62ch;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;
  color:var(--muted);letter-spacing:.06em;
}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--signal-soft);color:var(--signal);
  font-size:12px;font-weight:600;letter-spacing:.02em;
  padding:4px 10px;border-radius:999px;
}
.badge-plain{background:#EFEBE2;color:var(--muted);}

/* hero */
.hero-cover{
  position:relative;margin:0;border-radius:var(--r-card);overflow:hidden;
  aspect-ratio:16/9;background:#1a1a1a;box-shadow:var(--shadow-1);
}
.hero-cover img{width:100%;height:100%;object-fit:cover;}
.hero-cover::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(to top,rgba(14,20,18,.42) 0%,rgba(14,20,18,0) 55%);
  pointer-events:none;
}
.live-badge{
  position:absolute;top:14px;left:14px;z-index:2;
  display:inline-flex;align-items:center;gap:7px;
  background:var(--signal);color:#fff;font-size:12px;font-weight:700;
  padding:5px 12px;border-radius:999px;letter-spacing:.04em;
}
.live-dot{width:7px;height:7px;border-radius:50%;background:#fff;animation:pulse 1.6s infinite;}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.72)}}
.hero h1{
  font-size:clamp(30px,4.2vw,54px);line-height:1.1;font-weight:800;letter-spacing:-0.02em;
  margin:22px 0 14px;
}
.hero-lead{font-size:clamp(15px,1.4vw,17px);color:var(--muted);max-width:56ch;line-height:1.8;}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px;}

.count-card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  padding:32px;box-shadow:var(--shadow-1);
}
.count-label{font-size:12.5px;font-weight:600;letter-spacing:.06em;color:var(--muted);}
.count-grid{display:grid;grid-template-columns:repeat(4,1fr);margin:20px 0 4px;}
.count-cell{text-align:center;padding:2px 0;border-left:1px solid var(--line);}
.count-cell:first-child{border-left:0;}
.count-num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(28px,3.4vw,44px);font-weight:700;line-height:1.15;letter-spacing:-0.02em;
}
.count-num.tick{animation:tick .2s var(--ease);}
@keyframes tick{0%{opacity:.25;transform:translateY(-3px)}100%{opacity:1;transform:none}}
.count-unit{display:block;font-size:11.5px;color:var(--muted);letter-spacing:.08em;margin-top:4px;}
.points{margin-top:22px;border-top:1px dashed var(--line);padding-top:16px;}
.points li{
  display:flex;gap:12px;align-items:flex-start;
  padding:12px 0;border-bottom:1px dashed var(--line);font-size:14.5px;line-height:1.7;
}
.points li:last-child{border-bottom:0;padding-bottom:0;}
.points .idx{font-family:var(--font-mono);font-weight:700;color:var(--signal);font-size:13px;padding-top:2px;}

/* news cards */
.news-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.news-card{
  display:block;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;box-shadow:var(--shadow-1);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.news-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#CFC9BD;}
.news-card h3{font-size:19px;font-weight:700;line-height:1.45;margin-bottom:10px;}
.news-card p{color:var(--muted);font-size:14.5px;line-height:1.75;}
.news-meta{display:flex;align-items:center;gap:12px;margin-top:18px;flex-wrap:wrap;}
.news-meta time{font-family:var(--font-mono);font-size:12.5px;color:var(--muted);}
.news-card--wide{grid-column:span 2;display:grid;grid-template-columns:300px 1fr;gap:24px;align-items:center;}
.news-thumb{border-radius:var(--r-img);overflow:hidden;aspect-ratio:16/10;background:#ececec;}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .28s var(--ease);}
.news-card:hover .news-thumb img{transform:scale(1.03);}
.empty-state{
  grid-column:span 2;background:var(--paper);border:1px dashed var(--line);border-radius:var(--r-card);
  padding:56px 24px;text-align:center;
}
.empty-state svg{width:48px;height:48px;margin:0 auto 14px;color:var(--muted);}
.empty-state p{color:var(--muted);font-size:14.5px;margin-bottom:18px;}

/* replay strip */
.strip{display:flex;gap:20px;overflow-x:auto;padding:6px 4px 20px;scroll-snap-type:x mandatory;}
.strip::-webkit-scrollbar{height:6px;}
.strip::-webkit-scrollbar-thumb{background:#D8D3C7;border-radius:999px;}
.replay-card{
  flex:0 0 calc((100% - 60px)/4);min-width:240px;scroll-snap-align:start;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease);
}
.replay-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
.replay-cover{position:relative;aspect-ratio:16/10;overflow:hidden;background:#e9e9e9;}
.replay-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease);}
.replay-card:hover .replay-cover img{transform:scale(1.04);}
.play-dot{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:46px;height:46px;border-radius:50%;background:rgba(14,20,18,.62);
  display:flex;align-items:center;justify-content:center;
  transition:transform .2s var(--ease),background-color .2s var(--ease);
}
.replay-card:hover .play-dot{transform:translate(-50%,-50%) scale(1.12);background:var(--signal);}
.play-dot svg{width:16px;height:16px;fill:#fff;margin-left:2px;}
.duration{
  position:absolute;right:10px;bottom:10px;background:rgba(14,20,18,.72);color:#fff;
  font-family:var(--font-mono);font-size:11.5px;padding:2px 8px;border-radius:6px;letter-spacing:.02em;
}
.replay-body{padding:16px 18px 20px;}
.replay-body h3{font-size:15.5px;font-weight:700;line-height:1.5;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.replay-body span{display:block;font-size:12.5px;color:var(--muted);margin-top:6px;}

/* form band */
.band{background:#EFEBE2;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.band-inner{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;padding:72px 0;}
.band h2{font-size:clamp(24px,2.8vw,34px);font-weight:700;line-height:1.3;}
.band p{color:var(--muted);margin-top:12px;font-size:15px;max-width:52ch;}
.sub-form{display:flex;gap:12px;align-items:flex-start;flex-wrap:wrap;}
.sub-form input[type="email"]{
  flex:1 1 240px;min-width:0;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-btn);padding:13px 16px;font-size:15px;
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.sub-form input[type="email"]::placeholder{color:#A8AEA9;}
.sub-form input[type="email"]:focus{outline:none;border-color:var(--signal);box-shadow:0 0 0 3px rgba(255,90,31,.12);}
.sub-form input.error{border-color:var(--signal);}
.form-note{font-size:12px;color:var(--muted);margin-top:12px;line-height:1.7;}
.form-msg{font-size:13px;margin-top:10px;display:none;padding:8px 12px;border-radius:8px;}
.form-msg.ok{display:block;background:var(--signal-soft);color:#B8400F;}
.form-msg.bad{display:block;color:var(--signal);}

/* faq */
.faq-item{border-bottom:1px solid var(--line);}
.faq-item:first-child{border-top:1px solid var(--line);}
.faq-q{
  width:100%;background:none;border:0;cursor:pointer;text-align:left;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:0;min-height:56px;font-size:16.5px;font-weight:600;line-height:1.6;
  transition:color .14s var(--ease);
}
.faq-q:hover{color:var(--signal);}
.faq-icon{
  font-family:var(--font-mono);font-size:20px;color:var(--signal);flex:0 0 auto;
  transition:transform .2s var(--ease);line-height:1;
}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .2s var(--ease);}
.faq-item.open .faq-a{max-height:420px;}
.faq-a p{color:var(--muted);font-size:15px;padding:0 0 22px;max-width:72ch;}

/* channel導流 */
.channel-grid{display:grid;grid-template-columns:2fr 1fr;gap:24px;align-items:stretch;}
.channel-feature{
  position:relative;display:block;border-radius:var(--r-card);overflow:hidden;
  min-height:340px;box-shadow:var(--shadow-1);
}
.channel-feature img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease);}
.channel-feature:hover img{transform:scale(1.03);}
.channel-feature::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(120deg,rgba(14,20,18,.82) 0%,rgba(14,20,18,.35) 65%,rgba(14,20,18,.15) 100%);
}
.channel-feature-inner{position:relative;z-index:2;padding:36px;color:#fff;max-width:56ch;align-self:flex-end;}
.channel-feature-inner h3{font-size:26px;font-weight:800;line-height:1.3;margin-bottom:12px;}
.channel-feature-inner p{color:rgba(255,255,255,.78);font-size:14.5px;}
.channel-feature-inner .link-more{display:inline-block;margin-top:20px;color:#fff;}
.channel-list{display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;}
.channel-link{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:22px 24px;border-bottom:1px solid var(--line);
  transition:background-color .16s var(--ease),padding-left .16s var(--ease);
}
.channel-link:last-child{border-bottom:0;}
.channel-link:hover{background:var(--signal-soft);padding-left:28px;}
.channel-link strong{display:block;font-size:15.5px;font-weight:700;}
.channel-link small{display:block;color:var(--muted);font-size:12.5px;margin-top:4px;}
.channel-link .arrow{color:var(--signal);font-size:14px;}

/* footer */
.site-footer{background:var(--ink);color:#fff;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding:72px 0 40px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-text{font-size:16px;}
.footer-about{color:rgba(255,255,255,.6);font-size:13.5px;line-height:1.85;max-width:36ch;}
.footer-col h4{font-size:13px;font-weight:600;letter-spacing:.06em;color:rgba(255,255,255,.5);margin-bottom:16px;}
.footer-col li{margin-bottom:10px;}
.footer-col a{color:rgba(255,255,255,.75);font-size:14px;transition:color .14s var(--ease);}
.footer-col a:hover{color:var(--signal);}
.footer-bottom{
  border-top:1px solid var(--line-ink);padding:22px 0 30px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  color:rgba(255,255,255,.45);font-size:12.5px;
}

/* reveal */
.reveal{opacity:0;transform:translateY(8px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.in{opacity:1;transform:none;}

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

@media (max-width:1279px){
  .wrap{padding:0 32px;}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px;}
}
@media (max-width:1023px){
  .topbar{display:flex;}
  .sidebar{
    transform:translateX(-100%);transition:transform .24s var(--ease);
    top:0;bottom:0;height:100%;box-shadow:var(--shadow-2);
  }
  .sidebar.open{transform:none;}
  .app-main{margin-left:0;}
  .wrap{padding:0 20px;}
  .section{padding:64px 0;}
  .section:first-child{padding-top:36px;}
  .band-inner{grid-template-columns:1fr;gap:28px;padding:56px 0;}
  .channel-grid{grid-template-columns:1fr;}
  .news-card--wide{grid-template-columns:1fr;}
  .replay-card{flex:0 0 62%;}
  .hero-cover{max-height:52vh;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;padding:56px 0 32px;}
}
@media (max-width:639px){
  .news-grid{grid-template-columns:1fr;}
  .news-card--wide{grid-column:span 1;}
  .empty-state{grid-column:span 1;}
  .count-card{padding:20px;}
  .count-num{font-size:26px;}
  .count-cell{padding:0 2px;}
  .hero h1{margin-top:18px;}
  .replay-card{flex:0 0 74%;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .btn-primary,.btn-outline,.btn-ghost{width:100%;}
  .cta-row{width:100%;}
  .sub-form{width:100%;}
  .sub-form .btn-primary{width:100%;}
}

/* roulang page: article */
:root{
  --ink:#0E1412;
  --ink-soft:#1C2421;
  --sand:#F7F5F0;
  --paper:#FFFFFF;
  --line:#E5E1D9;
  --muted:#7C837F;
  --signal:#FF5A1F;
  --signal-soft:#FFE9DF;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --shadow-1:0 1px 2px rgba(14,20,18,.05),0 10px 24px -14px rgba(14,20,18,.20);
  --shadow-2:0 2px 4px rgba(14,20,18,.06),0 18px 36px -18px rgba(14,20,18,.30);
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --nav-w:248px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--sand);
  color:var(--ink);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button,input{font-family:inherit;font-size:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:4px}

/* ============ 左侧 App Shell ============ */
.sidebar{
  display:none;
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--nav-w);
  background:var(--ink);
  color:rgba(255,255,255,.7);
  flex-direction:column;
  padding:26px 18px 22px;
  border-right:1px solid rgba(255,255,255,.08);
  z-index:70;
  overflow-y:auto;
}
.brand{
  display:flex;align-items:center;gap:10px;
  color:#fff;font-weight:800;font-size:16.5px;letter-spacing:.02em;
  padding:0 6px;
}
.brand-mark{width:26px;height:26px;flex:none}
.brand-sub{
  margin:10px 6px 0;
  font-size:12px;line-height:1.6;color:rgba(255,255,255,.42);letter-spacing:.04em;
}
.nav-group{display:flex;flex-direction:column;gap:4px;margin-top:30px}
.nav-item{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;
  padding:11px 12px 11px 15px;
  border-radius:10px;
  font-size:14.5px;
  color:rgba(255,255,255,.70);
  transition:color .16s cubic-bezier(.2,.7,.3,1),background .16s cubic-bezier(.2,.7,.3,1);
}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.06)}
.nav-item.active{color:#fff;background:var(--ink-soft)}
.nav-item.active::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:2px;
  background:var(--signal);border-radius:2px;
}
.nav-item .arrow{font-size:15px;opacity:.45;transition:transform .16s ease}
.nav-item:hover .arrow{transform:translateX(2px);opacity:.9}
.side-divider{height:1px;background:rgba(255,255,255,.10);margin:26px 6px}
.side-note{font-size:12px;color:rgba(255,255,255,.42);line-height:1.7;padding:0 6px;margin-bottom:16px}
.side-foot{margin-top:auto;display:flex;flex-direction:column;gap:10px;padding-top:20px}
.btn-block{
  display:flex;align-items:center;justify-content:center;
  gap:8px;width:100%;
  background:var(--signal);color:#fff;
  font-weight:700;font-size:14px;
  padding:13px 16px;border:none;border-radius:var(--r-btn);
  transition:transform .16s cubic-bezier(.2,.7,.3,1),background .16s,box-shadow .16s;
  box-shadow:0 10px 22px -14px rgba(255,90,31,.9);
}
.btn-block:hover{background:#ff6f3c;transform:translateY(-1px)}
.btn-block:active{transform:translateY(1px)}
.side-link{
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:rgba(255,255,255,.6);
  padding:10px 12px;border:1px solid rgba(255,255,255,.12);border-radius:var(--r-btn);
  transition:color .16s,border-color .16s,background .16s;
}
.side-link:hover{color:#fff;border-color:rgba(255,255,255,.32);background:rgba(255,255,255,.05)}

/* ============ 移动端顶栏与抽屉 ============ */
.topbar{
  position:sticky;top:0;z-index:80;
  height:56px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 18px;
  background:var(--ink);color:#fff;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.topbar .brand{font-size:15.5px;padding:0}
.burger{
  width:40px;height:40px;border-radius:10px;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  transition:background .16s;
}
.burger:hover{background:rgba(255,255,255,.12)}
.burger span{display:block;width:16px;height:1.6px;background:#fff;border-radius:2px}
.drawer{
  position:fixed;top:0;left:0;bottom:0;width:280px;
  background:var(--ink);color:#fff;z-index:95;
  padding:22px 18px;
  transform:translateX(-102%);
  transition:transform .24s cubic-bezier(.2,.7,.3,1);
  display:flex;flex-direction:column;overflow-y:auto;
}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}
.drawer-close{
  width:34px;height:34px;border-radius:9px;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:#fff;
  font-size:16px;line-height:1;
}
.overlay{
  position:fixed;inset:0;background:rgba(14,20,18,.5);
  opacity:0;pointer-events:none;transition:opacity .24s ease;z-index:90;
}
.overlay.open{opacity:1;pointer-events:auto}

/* ============ 主内容 ============ */
.main{min-height:100vh;display:flex;flex-direction:column}
.shell{
  width:100%;
  max-width:1280px;
  margin:0 auto;
  padding:28px 18px 64px;
  flex:1;
}
@media (min-width:640px){ .shell{padding:34px 28px 72px} }
@media (min-width:1024px){
  .sidebar{display:flex}
  .topbar{display:none}
  .main{margin-left:var(--nav-w)}
  .shell{padding:44px 44px 88px}
}
@media (min-width:1600px){
  .shell{padding-left:56px;padding-right:56px}
}

/* 面包屑 */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--muted);margin-bottom:22px;
}
.crumb a{color:var(--muted);transition:color .16s}
.crumb a:hover{color:var(--signal)}
.crumb .sep{color:#C6C0B4}
.crumb .current{color:var(--ink);max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 文章头部 */
.post-head{margin-bottom:28px}
.tag{
  display:inline-flex;align-items:center;
  background:var(--signal-soft);color:#C43C09;
  font-size:12px;font-weight:600;letter-spacing:.04em;
  padding:5px 12px;border-radius:999px;
}
.post-head h1{
  font-size:clamp(26px,3.6vw,42px);
  line-height:1.22;
  font-weight:800;
  letter-spacing:-.01em;
  margin:16px 0 18px;
  max-width:22ch;
}
@media (min-width:1024px){ .post-head h1{max-width:26ch} }
.post-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;
  font-size:13px;color:var(--muted);
}
.post-meta .dot{width:3px;height:3px;border-radius:50%;background:#CDC7BA}
.post-meta .mono{color:#4A5250}

/* 双栏布局 */
.post-layout{display:block}
@media (min-width:1024px){
  .post-layout{
    display:grid;
    grid-template-columns:minmax(0,1fr) 300px;
    gap:56px;
    align-items:start;
  }
}
.article-wrap{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:26px 20px 30px;
  box-shadow:var(--shadow-1);
}
@media (min-width:640px){ .article-wrap{padding:38px 36px 44px} }
@media (min-width:1024px){ .article-wrap{padding:44px 48px 52px} }

/* 正文排版 */
.article-body{max-width:72ch;font-size:16px;line-height:1.9;color:#232A28}
.article-body > *:first-child{margin-top:0}
.article-body p{margin:0 0 1.2em}
.article-body h2{
  position:relative;
  font-size:24px;line-height:1.4;font-weight:700;color:var(--ink);
  margin:48px 0 16px;padding-left:16px;letter-spacing:-.01em;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.34em;width:3px;height:24px;
  background:var(--signal);border-radius:2px;
}
.article-body h3{font-size:20px;line-height:1.5;font-weight:700;margin:32px 0 12px;color:var(--ink)}
.article-body h4{font-size:17px;font-weight:700;margin:24px 0 10px;color:var(--ink)}
.article-body ul,.article-body ol{margin:0 0 1.3em;padding-left:1.35em}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin-bottom:.5em;line-height:1.9}
.article-body li::marker{color:var(--signal);font-weight:700}
.article-body img{border-radius:var(--r-img);margin:26px auto;box-shadow:var(--shadow-1)}
.article-body figure{margin:26px 0}
.article-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px}
.article-body blockquote{
  border-left:3px solid var(--signal);
  background:var(--signal-soft);
  border-radius:0 var(--r-img) var(--r-img) 0;
  padding:20px 22px;margin:26px 0;color:#3A322D;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body a{color:#C43C09;border-bottom:1px solid rgba(255,90,31,.4);transition:border-color .16s,color .16s}
.article-body a:hover{color:var(--signal);border-color:var(--signal)}
.article-body strong{font-weight:700;color:var(--ink)}
.article-body hr{border:none;border-top:1px solid var(--line);margin:36px 0}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:12px 14px;text-align:left}
.article-body th{background:var(--sand);font-weight:700}

/* 空态 */
.empty-state{
  text-align:center;padding:56px 20px;
}
.empty-state svg{width:48px;height:48px;margin:0 auto 18px;color:#C6C0B4}
.empty-state h3{font-size:19px;font-weight:700;margin-bottom:8px}
.empty-state p{font-size:14.5px;color:var(--muted);margin-bottom:22px}

/* 底部导航 */
.post-foot{
  margin-top:40px;padding-top:26px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:12px;
}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  border-radius:var(--r-btn);
  font-size:14.5px;font-weight:600;
  padding:12px 20px;
  transition:transform .16s cubic-bezier(.2,.7,.3,1),background .16s,color .16s,border-color .16s,box-shadow .16s;
}
.btn-primary{background:var(--ink);color:#fff;border:1px solid var(--ink);box-shadow:var(--shadow-1)}
.btn-primary:hover{background:var(--signal);border-color:var(--signal);transform:translateY(-2px);color:#fff}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}

/* 侧栏 */
.post-aside{display:flex;flex-direction:column;gap:20px;margin-top:36px}
@media (min-width:1024px){
  .post-aside{margin-top:0;position:sticky;top:24px}
}
.aside-card{
  background:var(--paper);border:1px solid var(--line);
  border-radius:var(--r-card);padding:20px 20px 22px;box-shadow:var(--shadow-1);
}
.aside-title{
  font-size:12.5px;font-weight:700;letter-spacing:.06em;color:var(--muted);
  margin-bottom:14px;
}
.toc-list{display:flex;flex-direction:column;gap:2px;max-height:320px;overflow:auto}
.toc-list a{
  display:block;font-size:13.5px;color:#5C6360;line-height:1.6;
  padding:7px 10px;border-left:2px solid transparent;border-radius:0 6px 6px 0;
  transition:color .16s,background .16s,border-color .16s;
}
.toc-list a:hover{color:var(--ink);background:var(--sand)}
.toc-list a.active{color:var(--ink);font-weight:600;border-left-color:var(--signal);background:var(--sand)}
.rec-list{display:flex;flex-direction:column}
.rec-list li + li{border-top:1px dashed var(--line)}
.rec-list a{
  display:flex;gap:12px;align-items:flex-start;
  padding:12px 0;font-size:14px;line-height:1.6;
  transition:color .16s;
}
.rec-list a:hover{color:var(--signal)}
.rec-num{
  font-family:var(--font-mono);font-size:12px;color:var(--signal);font-weight:700;
  margin-top:3px;flex:none;
}
.aside-cta{
  background:var(--ink);color:#fff;border-radius:var(--r-card);padding:22px 20px;
  border:1px solid var(--ink);
}
.aside-cta h4{font-size:16px;font-weight:700;margin-bottom:8px}
.aside-cta p{font-size:13px;line-height:1.7;color:rgba(255,255,255,.62);margin-bottom:16px}
.aside-cta .btn{width:100%;justify-content:center;background:var(--signal);border-color:var(--signal);color:#fff}
.aside-cta .btn:hover{background:#ff6f3c;transform:translateY(-2px)}

/* 相关推荐 */
.relate{margin-top:64px}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:16px;margin-bottom:24px;
}
.section-head h2{
  font-size:clamp(20px,2.4vw,26px);font-weight:700;letter-spacing:-.01em;
}
.section-head .more{font-size:13.5px;font-weight:600;color:var(--signal)}
.section-head .more:hover{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:2px}
.relate-grid{display:grid;gap:20px;grid-template-columns:1fr}
@media (min-width:640px){ .relate-grid{grid-template-columns:repeat(2,1fr)} }
@media (min-width:1024px){ .relate-grid{grid-template-columns:repeat(3,1fr)} }
.rcard{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;display:flex;flex-direction:column;
  transition:transform .18s cubic-bezier(.2,.7,.3,1),box-shadow .18s,border-color .18s;
}
.rcard:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D3CDBF}
.rcard .thumb{aspect-ratio:16/10;overflow:hidden;background:var(--sand)}
.rcard .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s cubic-bezier(.2,.7,.3,1)}
.rcard:hover .thumb img{transform:scale(1.03)}
.rcard-body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.rcard-body h3{font-size:16.5px;font-weight:700;line-height:1.5}
.rcard-body p{font-size:13.5px;color:var(--muted);line-height:1.7;flex:1}
.rcard-meta{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}
.pill{
  display:inline-block;background:var(--signal-soft);color:#C43C09;
  font-size:11.5px;font-weight:600;padding:3px 10px;border-radius:999px;
}

/* 返回顶部 */
.to-top{
  position:fixed;right:20px;bottom:24px;width:44px;height:44px;border-radius:50%;
  background:var(--ink);color:#fff;border:none;
  display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;
  transition:opacity .2s ease,transform .2s ease,background .16s;
  z-index:60;box-shadow:var(--shadow-2);
}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{background:var(--signal);transform:translateY(-2px)}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--ink);color:rgba(255,255,255,.72);
  margin-top:72px;
}
.wrap{max-width:1280px;margin:0 auto;padding:56px 20px 26px}
@media (min-width:640px){ .wrap{padding:64px 28px 28px} }
@media (min-width:1024px){ .wrap{padding:72px 44px 30px} }
.footer-grid{display:grid;gap:36px;grid-template-columns:1fr}
@media (min-width:640px){ .footer-grid{grid-template-columns:repeat(2,1fr)} }
@media (min-width:1024px){ .footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px} }
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:16px}
.footer-brand .brand-mark{width:24px;height:24px}
.footer-about{font-size:13.5px;line-height:1.8;color:rgba(255,255,255,.55);margin-top:14px;max-width:34ch}
.footer-col h4{
  font-size:12.5px;font-weight:700;letter-spacing:.14em;color:rgba(255,255,255,.5);
  margin-bottom:16px;
}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col a{font-size:14px;color:rgba(255,255,255,.78);transition:color .16s}
.footer-col a:hover{color:var(--signal)}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.10);
  display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;
  font-size:12.5px;color:rgba(255,255,255,.45);
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

/* roulang page: category1 */
:root{
  --ink:#0E1412;
  --ink-soft:#1C2421;
  --sand:#F7F5F0;
  --paper:#FFFFFF;
  --line:#E5E1D9;
  --muted:#7C837F;
  --signal:#FF5A1F;
  --signal-soft:#FFE9DF;
  --body-text:#414845;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --shadow-1:0 1px 2px rgba(14,20,18,.05),0 10px 24px -14px rgba(14,20,18,.20);
  --shadow-2:0 2px 4px rgba(14,20,18,.06),0 18px 34px -18px rgba(14,20,18,.28);
  --ease:cubic-bezier(.2,.7,.3,1);
  --side-w:248px;
  --top-h:56px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
.k-body{
  margin:0;
  padding:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  color:var(--ink);
  background:var(--sand);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
ul{list-style:none}

/* ============ 左侧 App Shell 导航 ============ */
.k-side{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--side-w);
  background:var(--ink);
  border-right:1px solid rgba(255,255,255,.07);
  padding:26px 20px 24px;
  display:flex;
  flex-direction:column;
  overflow-y:auto;
  z-index:70;
}
.k-brand{display:flex;align-items:center;gap:10px;margin-bottom:28px}
.brand-mark{width:26px;height:26px;flex:none}
.k-brand-text{color:#fff;font-size:16px;font-weight:700;letter-spacing:.02em;line-height:1.3}
.nav-group{display:flex;flex-direction:column;gap:2px}
.nav-item{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:11px 12px 11px 14px;
  border-left:2px solid transparent;
  border-radius:8px;
  color:rgba(255,255,255,.7);
  font-size:14.5px;line-height:1.5;
  transition:color 140ms var(--ease),background 140ms var(--ease),border-color 140ms var(--ease);
}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.05)}
.nav-item.active{color:#fff;background:var(--ink-soft);border-left-color:var(--signal)}
.nav-item .arrow{font-size:13px;color:rgba(255,255,255,.35);transition:transform 140ms var(--ease),color 140ms var(--ease)}
.nav-item:hover .arrow{transform:translateX(2px);color:var(--signal)}
.k-side-divider{height:1px;background:rgba(255,255,255,.10);margin:22px 0}
.k-side-aux{margin-top:auto;display:flex;flex-direction:column;gap:10px;padding-top:14px}
.k-side-cta{
  display:block;text-align:center;
  background:var(--signal);color:#fff;font-weight:700;font-size:14.5px;
  padding:12px 14px;border-radius:var(--r-btn);
  transition:background 160ms var(--ease),transform 160ms var(--ease),box-shadow 160ms var(--ease);
}
.k-side-cta:hover{background:#FF6D38;transform:translateY(-1px);box-shadow:0 10px 22px -12px rgba(255,90,31,.95)}
.k-side-link{display:block;text-align:center;color:rgba(255,255,255,.62);font-size:13px;padding:7px;border-radius:8px;transition:color 140ms var(--ease)}
.k-side-link:hover{color:#fff}

/* ============ 移动端顶栏与抽屉 ============ */
.k-topbar{
  display:none;
  position:sticky;top:0;z-index:60;
  height:var(--top-h);
  background:var(--ink);
  align-items:center;justify-content:space-between;
  padding:0 16px;
}
.k-topbar .k-brand{margin:0}
.k-topbar .k-brand-text{font-size:15px}
.k-burger{
  width:40px;height:36px;border:none;background:transparent;
  display:flex;flex-direction:column;justify-content:center;gap:5px;
  cursor:pointer;padding:0 6px;border-radius:8px;
}
.k-burger span{display:block;height:2px;background:#fff;border-radius:2px;transition:transform 200ms var(--ease),opacity 160ms var(--ease)}
.k-overlay{display:none}

/* ============ 主内容区 ============ */
.k-main{margin-left:var(--side-w);min-height:100vh;display:flex;flex-direction:column}
.k-wrap{width:100%;max-width:1280px;margin:0 auto;padding:0 44px}

/* ============ 分类 Hero ============ */
.cat-hero{
  position:relative;
  color:#fff;
  padding:32px 0 54px;
  background-image:linear-gradient(180deg,rgba(14,20,18,.66),rgba(14,20,18,.52)),url('/assets/images/backpic/back-1.webp');
  background-size:cover;
  background-position:center;
}
.crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.72);margin-bottom:22px}
.crumbs a{transition:color 140ms var(--ease)}
.crumbs a:hover{color:var(--signal)}
.crumbs .sep{color:rgba(255,255,255,.4)}
.hero-title{
  font-size:clamp(28px,3.4vw,42px);
  line-height:1.2;font-weight:800;letter-spacing:-.01em;
  margin:0 0 14px;max-width:22ch;
}
.hero-sub{font-size:17px;line-height:1.75;color:rgba(255,255,255,.86);margin:0 0 26px;max-width:36ch}
.btn-hero{
  display:inline-flex;align-items:center;gap:8px;
  background:#fff;color:var(--ink);
  font-size:14.5px;font-weight:700;
  padding:12px 24px;border-radius:var(--r-btn);
  transition:background 160ms var(--ease),color 160ms var(--ease),transform 160ms var(--ease);
}
.btn-hero:hover{background:var(--signal);color:#fff;transform:translateY(-1px)}

/* ============ 通用板块 ============ */
.k-section{padding:88px 0}
.k-section.is-tight{padding:64px 0}
.sec-head{max-width:740px;margin-bottom:46px}
.sec-kicker{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.14em;color:var(--signal);margin:0 0 12px}
.sec-title{font-size:clamp(24px,2.6vw,34px);line-height:1.26;font-weight:800;letter-spacing:-.01em;margin:0 0 14px}
.sec-desc{font-size:16px;color:var(--muted);margin:0;line-height:1.85}

/* ============ 图文交替 ============ */
.alt-row{display:grid;grid-template-columns:5fr 7fr;gap:52px;align-items:center}
.alt-row + .alt-row{margin-top:74px}
.alt-row.is-flip{grid-template-columns:7fr 5fr}
.alt-row.is-flip .alt-media{order:2}
.alt-row.is-flip .alt-text{order:1}
.alt-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--r-img);
  box-shadow:var(--shadow-1);
  transition:transform 200ms var(--ease),box-shadow 200ms var(--ease);
}
.alt-media:hover img{transform:translateY(-2px);box-shadow:var(--shadow-2)}
.sec-num{font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.14em;color:var(--signal);margin:0 0 12px}
.alt-text h3{font-size:22px;line-height:1.42;font-weight:700;margin:0 0 16px}
.alt-text p{margin:0 0 14px;font-size:15.5px;line-height:1.9;color:var(--body-text)}
.alt-text p:last-child{margin-bottom:0}

/* ============ 深色数据带 ============ */
.band-dark{background:var(--ink);color:#fff}
.band-dark .sec-title{color:#fff}
.band-dark .sec-desc{color:rgba(255,255,255,.6)}
.stat-row{
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid rgba(255,255,255,.12);
  border-bottom:1px solid rgba(255,255,255,.12);
}
.stat{padding:38px 26px;border-right:1px solid rgba(255,255,255,.12)}
.stat:last-child{border-right:none}
.stat-num{
  font-family:var(--font-mono);
  font-size:clamp(28px,3vw,40px);
  font-weight:700;line-height:1.1;
  color:var(--signal);
  font-variant-numeric:tabular-nums;
  margin:0 0 12px;
}
.stat-num small{font-size:.46em;font-weight:600;margin-left:2px}
.stat-label{font-size:14.5px;font-weight:700;color:#fff;margin:0 0 8px}
.stat-note{font-size:13px;line-height:1.7;color:rgba(255,255,255,.55);margin:0}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line);max-width:880px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  list-style:none;cursor:pointer;
  min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:16px 4px;font-size:16.5px;font-weight:600;color:var(--ink);
  transition:color 140ms var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";font-family:var(--font-mono);font-size:20px;line-height:1;
  color:var(--signal);flex:none;
  transition:transform 200ms var(--ease);
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item summary:hover{color:var(--signal)}
.faq-body{padding:0 4px 24px;max-width:72ch;font-size:15.5px;line-height:1.9;color:var(--body-text);margin:0}

/* ============ 互链列表 ============ */
.link-list{border-top:1px solid var(--line)}
.link-row{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:22px 4px;border-bottom:1px solid var(--line);
  transition:padding 180ms var(--ease),background 180ms var(--ease);
}
.link-row:hover{padding-left:14px;background:rgba(255,255,255,.6)}
.link-title{font-size:17px;font-weight:700;transition:color 160ms var(--ease)}
.link-row:hover .link-title{color:var(--signal)}
.link-desc{font-size:14px;color:var(--muted);margin:4px 0 0;line-height:1.75}
.link-tag{
  display:inline-block;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--signal);background:var(--signal-soft);
  border-radius:999px;padding:3px 10px;margin-bottom:8px;
}
.link-arrow{font-family:var(--font-mono);font-size:18px;color:var(--signal);flex:none;transition:transform 180ms var(--ease)}
.link-row:hover .link-arrow{transform:translateX(4px)}

/* ============ 提醒订阅 CTA ============ */
.cta-band{
  background:#F1EDE4;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:64px 0;
}
.cta-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.cta-title{font-size:clamp(22px,2.4vw,30px);line-height:1.3;font-weight:800;margin:0 0 12px}
.cta-desc{font-size:15.5px;line-height:1.9;color:var(--body-text);margin:0}
.remind-form{display:flex;gap:12px;align-items:stretch}
.remind-form input{
  flex:1;min-width:0;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-btn);
  padding:13px 16px;font-size:15px;color:var(--ink);
  transition:border-color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.remind-form input::placeholder{color:#A6ACA8}
.remind-form input:focus{outline:none;border-color:var(--signal);box-shadow:0 0 0 3px rgba(255,90,31,.12)}
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--ink);color:#fff;
  border:none;border-radius:var(--r-btn);
  padding:13px 28px;font-size:15px;font-weight:700;cursor:pointer;
  white-space:nowrap;
  transition:background 160ms var(--ease),transform 160ms var(--ease);
}
.btn-primary:hover{background:var(--signal);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.form-note{font-size:12.5px;color:var(--muted);margin:12px 0 0;line-height:1.7}
.form-msg{font-size:13px;color:var(--signal);margin:10px 0 0;font-weight:600;min-height:1px}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink);color:#fff;padding:64px 0 28px;margin-top:auto}
.site-footer .wrap{width:100%;max-width:1280px;margin:0 auto;padding:0 44px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand .brand-mark{width:24px;height:24px}
.brand-text{font-size:16px;font-weight:700;color:#fff}
.footer-about{font-size:13.5px;line-height:1.85;color:rgba(255,255,255,.6);max-width:310px;margin:0}
.footer-col h4{font-size:13px;font-weight:600;letter-spacing:.06em;color:rgba(255,255,255,.5);margin:0 0 16px}
.footer-col ul{display:flex;flex-direction:column;gap:10px;padding:0;margin:0}
.footer-col a{font-size:14px;color:rgba(255,255,255,.82);transition:color 140ms var(--ease)}
.footer-col a:hover{color:var(--signal)}
.footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.1);
  margin-top:48px;padding-top:20px;
  font-size:13px;color:rgba(255,255,255,.45);
}

/* ============ 交互与动效 ============ */
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{
  outline:2px solid var(--signal);outline-offset:2px;border-radius:6px;
}
.reveal{opacity:0;transform:translateY(8px);transition:opacity 460ms var(--ease),transform 460ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .k-wrap{padding:0 32px}
  .site-footer .wrap{padding:0 32px}
  .alt-row{gap:38px}
  .alt-row.is-flip{gap:38px}
}
@media (max-width:1023px){
  .k-topbar{display:flex}
  .k-side{
    width:272px;
    transform:translateX(-100%);
    transition:transform 240ms var(--ease);
    padding-top:20px;
  }
  .k-side.is-open{transform:none}
  .k-main{margin-left:0}
  .k-overlay{
    display:block;position:fixed;inset:0;z-index:65;
    background:rgba(14,20,18,.5);
    opacity:0;visibility:hidden;
    transition:opacity 200ms var(--ease),visibility 200ms var(--ease);
  }
  .k-overlay.is-on{opacity:1;visibility:visible}
  .k-section{padding:72px 0}
  .alt-row,.alt-row.is-flip{grid-template-columns:1fr;gap:26px}
  .alt-row.is-flip .alt-media{order:1}
  .alt-row.is-flip .alt-text{order:2}
  .alt-row + .alt-row{margin-top:56px}
  .cta-grid{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .k-wrap{padding:0 20px}
  .site-footer .wrap{padding:0 20px}
  .k-section{padding:56px 0}
  .cat-hero{padding:24px 0 40px}
  .hero-sub{font-size:15.5px}
  .stat-row{grid-template-columns:1fr 1fr}
  .stat{padding:26px 18px;border-bottom:1px solid rgba(255,255,255,.12)}
  .stat:nth-child(2n){border-right:none}
  .stat:nth-last-child(-n+2){border-bottom:none}
  .remind-form{flex-direction:column}
  .btn-primary{width:100%}
  .link-row{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category2 */
:root{
    --ink:#0E1412;
    --ink-soft:#1C2421;
    --line-ink:rgba(255,255,255,.10);
    --sand:#F7F5F0;
    --sand-deep:#EFEBE1;
    --paper:#FFFFFF;
    --line:#E5E1D9;
    --muted:#7C837F;
    --signal:#FF5A1F;
    --signal-soft:#FFE9DF;
    --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
    --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
    --shadow-1:0 1px 2px rgba(14,20,18,.05),0 10px 24px -14px rgba(14,20,18,.20);
    --shadow-2:0 2px 4px rgba(14,20,18,.06),0 18px 40px -18px rgba(14,20,18,.28);
    --r-card:16px;
    --r-img:12px;
    --r-btn:10px;
    --ease:cubic-bezier(.2,.7,.3,1);
    --sidebar-w:248px;
  }

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

  html.js .reveal{opacity:0;transform:translateY(8px);}
  html.js .reveal.in{opacity:1;transform:none;transition:opacity .55s var(--ease),transform .55s var(--ease);}

  .app{min-height:100vh;}
  .main{min-height:100vh;display:flex;flex-direction:column;}
  .wrap{width:100%;max-width:1280px;margin:0 auto;padding-left:20px;padding-right:20px;}
  .mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

  /* ============ 侧栏 / 导航 ============ */
  .sidebar{
    position:fixed;
    top:0;left:0;bottom:0;
    width:var(--sidebar-w);
    background:var(--ink);
    border-right:1px solid var(--line-ink);
    display:flex;
    flex-direction:column;
    padding:26px 18px 22px;
    z-index:80;
  }
  .brand{display:flex;align-items:center;gap:10px;min-width:0;}
  .brand-mark{width:26px;height:26px;flex:none;}
  .brand-text{font-size:17px;font-weight:800;color:#fff;letter-spacing:.01em;white-space:nowrap;}
  .brand-sub{margin-top:8px;font-size:12px;color:rgba(255,255,255,.48);letter-spacing:.05em;}

  .nav-group{margin-top:34px;display:flex;flex-direction:column;gap:2px;}
  .nav-item{
    position:relative;
    display:flex;align-items:center;justify-content:space-between;gap:10px;
    padding:11px 12px;
    border-radius:10px;
    font-size:14.5px;
    color:rgba(255,255,255,.70);
    transition:color .14s var(--ease),background .14s var(--ease);
  }
  .nav-item .arrow{font-size:14px;line-height:1;opacity:.45;transition:transform .14s var(--ease),opacity .14s var(--ease);}
  .nav-item:hover{color:#fff;background:rgba(255,255,255,.05);}
  .nav-item:hover .arrow{opacity:.9;transform:translateX(2px);}
  .nav-item.active{color:#fff;background:var(--ink-soft);}
  .nav-item.active::before{
    content:"";position:absolute;left:0;top:10px;bottom:10px;width:2px;border-radius:2px;background:var(--signal);
  }
  .nav-item.active .arrow{opacity:.85;}

  .sidebar-foot{margin-top:auto;padding-top:18px;border-top:1px solid var(--line-ink);display:flex;flex-direction:column;gap:10px;}
  .sidebar-foot .btn{width:100%;padding:12px 16px;}
  .sidebar-foot .mini-link{font-size:13px;color:rgba(255,255,255,.60);}
  .sidebar-foot .mini-link:hover{color:var(--signal);}

  .hamburger{
    display:none;width:40px;height:40px;border-radius:10px;
    align-items:center;justify-content:center;
    border:1px solid var(--line-ink);
    transition:background .16s var(--ease),border-color .16s var(--ease);
  }
  .hamburger:hover{background:rgba(255,255,255,.08);}
  .hamburger span{display:block;width:18px;height:2px;background:#fff;position:relative;border-radius:2px;}
  .hamburger span::before,.hamburger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:#fff;border-radius:2px;}
  .hamburger span::before{top:-6px;}
  .hamburger span::after{top:6px;}
  .nav-overlay{display:none;}

  /* ============ 按钮 ============ */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:12px 20px;
    border-radius:var(--r-btn);
    font-size:14.5px;font-weight:600;line-height:1;
    border:1px solid transparent;
    white-space:nowrap;
    transition:transform .16s var(--ease),background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),box-shadow .16s var(--ease);
  }
  .btn:active{transform:translateY(1px);}
  .btn-primary{background:var(--ink);color:#fff;}
  .btn-primary:hover{background:var(--signal);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-2);}
  .btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink);}
  .btn-ghost:hover{background:var(--ink);color:#fff;transform:translateY(-2px);}
  .btn-on-dark{background:transparent;border-color:rgba(255,255,255,.45);color:#fff;}
  .btn-on-dark:hover{background:#fff;color:var(--ink);transform:translateY(-2px);}
  .link-more{display:inline-flex;align-items:center;gap:6px;color:var(--signal);font-size:14px;font-weight:600;}
  .link-more:hover{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:2px;}

  /* ============ Hero 条 ============ */
  .hero-band{
    position:relative;
    background-color:var(--ink);
    background-image:url('/assets/images/backpic/back-2.png');
    background-size:cover;
    background-position:center;
    overflow:hidden;
    color:#fff;
  }
  .hero-band::after{content:"";position:absolute;inset:0;background:rgba(14,20,18,.55);}
  .hero-band__inner{
    position:relative;z-index:2;
    display:flex;flex-direction:column;justify-content:center;gap:14px;
    min-height:236px;
    padding-top:40px;padding-bottom:44px;
  }
  .hero-tag{
    display:inline-flex;align-items:center;gap:8px;
    align-self:flex-start;
    padding:5px 12px;border-radius:999px;
    background:rgba(255,255,255,.14);
    border:1px solid rgba(255,255,255,.22);
    font-size:12px;font-weight:600;letter-spacing:.04em;color:#fff;
  }
  .pulse-dot{position:relative;width:7px;height:7px;border-radius:50%;background:var(--signal);flex:none;}
  .pulse-dot::after{content:"";position:absolute;inset:-4px;border-radius:50%;border:1px solid var(--signal);animation:pulse 1.6s infinite;}
  @keyframes pulse{0%{transform:scale(.6);opacity:.9}70%{transform:scale(1.4);opacity:0}100%{opacity:0}}
  .hero-band h1{
    font-size:clamp(25px,3.4vw,40px);
    line-height:1.2;font-weight:800;letter-spacing:-.01em;color:#fff;
    max-width:22ch;
  }
  .hero-band p{font-size:15.5px;color:rgba(255,255,255,.84);max-width:52ch;}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:6px;}

  /* ============ 面包屑 ============ */
  .crumb{background:var(--paper);border-bottom:1px solid var(--line);}
  .crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:14px 0;font-size:13px;color:var(--muted);}
  .crumb a{color:var(--muted);}
  .crumb a:hover{color:var(--signal);}
  .crumb .sep{opacity:.55;}
  .crumb .here{color:var(--ink);font-weight:600;}

  /* ============ 板块 ============ */
  .section{padding:64px 0;}
  .section.tight{padding:52px 0;}
  .section.alt{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .section-head{margin-bottom:30px;}
  .eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--signal);font-weight:600;}
  .h2{font-size:clamp(22px,2.6vw,32px);line-height:1.3;font-weight:700;letter-spacing:-.01em;margin-top:10px;}
  .lead{color:var(--muted);font-size:15.5px;max-width:70ch;margin-top:12px;}

  .intro-grid{display:grid;grid-template-columns:1fr;gap:26px;}
  .chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;}
  .chip{
    display:inline-flex;align-items:center;
    padding:5px 12px;border-radius:999px;
    background:var(--signal-soft);color:var(--signal);
    font-size:12px;font-weight:600;letter-spacing:.02em;
  }
  .intro-list{margin-top:18px;display:flex;flex-direction:column;gap:12px;}
  .intro-list li{position:relative;padding-left:18px;font-size:15.5px;color:var(--muted);}
  .intro-list li::before{content:"";position:absolute;left:0;top:12px;width:8px;height:2px;background:var(--signal);border-radius:2px;}
  .intro-list strong{color:var(--ink);font-weight:600;}

  /* ============ 时间轴 ============ */
  .timeline{position:relative;padding-left:40px;margin-top:6px;}
  .timeline::before{content:"";position:absolute;left:9px;top:10px;bottom:10px;width:1px;background:var(--line);}
  .tl-item{position:relative;padding-bottom:40px;}
  .tl-item:last-child{padding-bottom:0;}
  .tl-node{
    position:absolute;left:-40px;top:6px;
    width:19px;height:19px;border-radius:50%;
    background:var(--paper);border:1px solid var(--line);
    display:flex;align-items:center;justify-content:center;
  }
  .tl-node::after{content:"";width:7px;height:7px;border-radius:50%;background:var(--signal);}
  .tl-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--signal);font-weight:600;}
  .tl-item h3{font-size:18.5px;font-weight:700;margin-top:6px;line-height:1.4;}
  .tl-item p{color:var(--muted);font-size:15.5px;margin-top:8px;max-width:64ch;}

  /* ============ 参数卡 ============ */
  .spec-grid{display:grid;grid-template-columns:1fr;gap:16px;}
  .spec-card{
    background:var(--paper);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:24px;
    box-shadow:var(--shadow-1);
    transition:transform .16s var(--ease),box-shadow .16s var(--ease);
  }
  .spec-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
  .spec-card .k{font-size:13px;color:var(--muted);}
  .spec-card .v{font-family:var(--font-mono);font-size:clamp(23px,2.4vw,31px);font-weight:700;margin-top:10px;letter-spacing:-.01em;}
  .spec-card .v small{font-size:13px;font-weight:500;color:var(--muted);margin-left:4px;}
  .spec-card .d{font-size:13.5px;color:var(--muted);margin-top:8px;}
  .spec-card.feature{background:var(--ink);border-color:var(--ink);color:#fff;}
  .spec-card.feature .k,.spec-card.feature .d{color:rgba(255,255,255,.64);}
  .spec-card.feature .v{color:#fff;}

  /* ============ 片段卡片 ============ */
  .clip-grid{display:grid;grid-template-columns:1fr;gap:20px;}
  .clip-card{
    display:flex;flex-direction:column;
    background:var(--paper);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-1);
    transition:transform .16s var(--ease),box-shadow .16s var(--ease),border-color .16s var(--ease);
  }
  .clip-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#CFC9BD;}
  .clip-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--ink-soft);}
  .clip-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .24s var(--ease);}
  .clip-card:hover .clip-thumb img{transform:scale(1.03);}
  .clip-badge{
    position:absolute;right:10px;bottom:10px;
    background:rgba(14,20,18,.72);color:#fff;
    font-family:var(--font-mono);font-size:12px;
    padding:3px 8px;border-radius:6px;
  }
  .clip-body{padding:18px 18px 20px;}
  .clip-body h3{font-size:17px;font-weight:700;line-height:1.4;}
  .clip-body p{font-size:14px;color:var(--muted);margin-top:8px;}

  /* ============ FAQ ============ */
  .faq{border-top:1px solid var(--line);}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-q{
    width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
    min-height:56px;padding:16px 0;text-align:left;
    font-size:16.5px;font-weight:600;line-height:1.5;
    transition:color .16s var(--ease);
  }
  .faq-q:hover{color:var(--signal);}
  .faq-icon{position:relative;width:16px;height:16px;flex:none;transition:transform .2s var(--ease);}
  .faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--signal);border-radius:2px;}
  .faq-icon::before{left:0;top:7px;width:16px;height:2px;}
  .faq-icon::after{left:7px;top:0;width:2px;height:16px;}
  .faq-item.open .faq-icon{transform:rotate(45deg);}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .2s var(--ease);}
  .faq-a p{padding:0 0 22px;color:var(--muted);font-size:15.5px;max-width:74ch;}

  /* ============ 互链 ============ */
  .link-grid{display:grid;grid-template-columns:1fr;gap:16px;}
  .link-card{
    display:flex;flex-direction:column;justify-content:space-between;gap:20px;
    padding:24px;min-height:158px;
    background:var(--paper);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    transition:transform .16s var(--ease),box-shadow .16s var(--ease),border-color .16s var(--ease);
  }
  .link-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:var(--ink);}
  .link-card .lc-idx{font-family:var(--font-mono);font-size:12px;color:var(--signal);font-weight:600;letter-spacing:.06em;}
  .link-card h3{font-size:18px;font-weight:700;margin-top:8px;line-height:1.4;}
  .link-card .lc-desc{font-size:14px;color:var(--muted);margin-top:8px;}
  .link-card .go{font-size:13.5px;font-weight:600;color:var(--signal);display:inline-flex;align-items:center;gap:6px;}
  .link-card:hover .go{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:2px;}

  /* ============ CTA 表单 ============ */
  .cta-band{background:var(--sand-deep);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .cta-grid{display:grid;grid-template-columns:1fr;gap:24px;}
  .cta-grid .lead{margin-top:12px;}
  .form-row{display:flex;flex-wrap:wrap;gap:12px;}
  .field{
    flex:1 1 220px;min-width:0;
    background:#fff;border:1px solid var(--line);
    border-radius:10px;padding:13px 16px;
    font-size:15px;
    transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
  }
  .field::placeholder{color:#A8AEA9;}
  .field:focus{outline:none;border-color:var(--signal);box-shadow:0 0 0 3px rgba(255,90,31,.12);}
  .hint{font-size:12px;color:var(--muted);margin-top:12px;}
  .form-msg{display:none;margin-top:12px;font-size:13.5px;font-weight:600;color:var(--signal);}
  .form-msg.show{display:block;}

  /* ============ 页脚 ============ */
  .site-footer{background:var(--ink);color:#fff;padding:64px 0 28px;}
  .footer-grid{display:grid;grid-template-columns:1fr;gap:30px;}
  .footer-brand{display:flex;align-items:center;gap:10px;}
  .footer-brand .brand-mark{width:26px;height:26px;}
  .footer-brand .brand-text{font-size:17px;font-weight:800;color:#fff;}
  .footer-about{color:rgba(255,255,255,.62);font-size:14px;margin-top:14px;max-width:36ch;}
  .footer-col h4{font-size:13px;letter-spacing:.08em;font-weight:600;color:rgba(255,255,255,.55);margin-bottom:14px;}
  .footer-col ul{display:flex;flex-direction:column;gap:10px;}
  .footer-col a{font-size:14px;color:rgba(255,255,255,.82);}
  .footer-col a:hover{color:var(--signal);}
  .footer-bottom{
    margin-top:44px;padding-top:20px;border-top:1px solid var(--line-ink);
    display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
    font-size:12.5px;color:rgba(255,255,255,.55);
  }

  /* ============ 响应式 ============ */
  @media (min-width:640px){
    .spec-grid{grid-template-columns:repeat(2,1fr);}
    .clip-grid{grid-template-columns:repeat(2,1fr);}
  }
  @media (min-width:768px){
    .link-grid{grid-template-columns:repeat(3,1fr);}
    .footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;}
  }
  @media (min-width:1024px){
    .main{margin-left:var(--sidebar-w);padding-top:0;}
    .wrap{padding-left:48px;padding-right:48px;}
    .section{padding:100px 0;}
    .section.tight{padding:72px 0;}
    .hero-band__inner{min-height:260px;padding-top:48px;padding-bottom:52px;}
    .intro-grid{grid-template-columns:0.85fr 1.15fr;gap:56px;align-items:start;}
    .spec-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;}
    .clip-grid{grid-template-columns:repeat(4,1fr);}
    .cta-grid{grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
  }
  @media (max-width:1023px){
    .sidebar{
      top:0;left:0;right:0;bottom:auto;
      width:auto;height:56px;
      flex-direction:row;align-items:center;justify-content:space-between;
      padding:0 16px;
      border-right:0;border-bottom:1px solid var(--line-ink);
    }
    .brand-sub{display:none;}
    .hamburger{display:flex;}
    .nav-group{
      position:fixed;top:0;left:0;bottom:0;
      width:280px;max-width:84vw;
      margin:0;padding:84px 18px 26px;
      background:var(--ink);
      transform:translateX(-100%);
      transition:transform .24s var(--ease);
      overflow-y:auto;
      z-index:78;
    }
    .sidebar-foot{
      position:fixed;left:0;bottom:0;
      width:280px;max-width:84vw;
      margin:0;padding:18px;
      background:var(--ink);
      border-top:1px solid var(--line-ink);
      transform:translateX(-100%);
      transition:transform .24s var(--ease);
      z-index:79;
    }
    body.drawer-open .nav-group,
    body.drawer-open .sidebar-foot{transform:translateX(0);}
    body.drawer-open .nav-overlay{
      display:block;position:fixed;inset:0;
      background:rgba(14,20,18,.5);
      z-index:76;
    }
    body.drawer-open{overflow:hidden;}
    .main{padding-top:56px;}
    .nav-item{padding:13px 12px;font-size:15px;}
  }
  @media (max-width:519px){
    .hero-band__inner{min-height:200px;}
    .hero-actions .btn{width:100%;}
    .timeline{padding-left:32px;}
    .timeline::before{left:7px;}
    .tl-node{left:-32px;width:15px;height:15px;}
    .tl-node::after{width:6px;height:6px;}
  }
  @media (prefers-reduced-motion: reduce){
    *{animation:none!important;transition:none!important;}
    html.js .reveal{opacity:1;transform:none;}
  }

/* roulang page: category3 */
:root{
  --ink:#0E1412;
  --ink-soft:#1C2421;
  --sand:#F7F5F0;
  --paper:#FFFFFF;
  --line:#E5E1D9;
  --line-ink:rgba(255,255,255,.10);
  --muted:#7C837F;
  --signal:#FF5A1F;
  --signal-soft:#FFE9DF;
  --shadow-1:0 1px 2px rgba(14,20,18,.05),0 10px 24px -14px rgba(14,20,18,.20);
  --shadow-2:0 2px 6px rgba(14,20,18,.07),0 18px 40px -18px rgba(14,20,18,.28);
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--sand);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input{font-family:inherit;font-size:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;}
p{margin:0;}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:4px;}

/* ---------- App Shell ---------- */
.shell{display:flex;min-height:100vh;}
.sidebar{
  position:fixed;top:0;left:0;bottom:0;width:248px;
  background:var(--ink);color:#fff;
  display:flex;flex-direction:column;
  padding:26px 16px 22px;
  border-right:1px solid var(--line-ink);
  z-index:60;
}
.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 22px;}
.brand-mark{width:28px;height:28px;flex:0 0 28px;}
.brand-text{font-size:17px;font-weight:800;letter-spacing:-0.01em;color:#fff;line-height:1.2;}
.brand-sub{display:block;font-size:11px;font-weight:400;color:rgba(255,255,255,.5);letter-spacing:.04em;margin-top:2px;}
.nav-label{font-size:11px;font-weight:600;color:rgba(255,255,255,.38);letter-spacing:.06em;padding:0 8px 10px;}
.nav-group{display:flex;flex-direction:column;gap:2px;}
.nav-item{
  position:relative;display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:11px 12px 11px 14px;border-radius:8px;
  font-size:14.5px;color:rgba(255,255,255,.7);
  transition:color .14s var(--ease),background-color .14s var(--ease);
}
.nav-item .arrow{font-size:15px;opacity:.35;transition:opacity .14s var(--ease),transform .14s var(--ease);}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.05);}
.nav-item:hover .arrow{opacity:.85;transform:translateX(2px);}
.nav-item.active{color:#fff;background:var(--ink-soft);}
.nav-item.active .arrow{opacity:.9;}
.nav-item.active::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:2px;
  background:var(--signal);border-radius:2px;
}
.side-sep{height:1px;background:var(--line-ink);margin:20px 8px;}
.side-foot{margin-top:auto;display:flex;flex-direction:column;gap:8px;padding:0 4px;}
.side-tip{font-size:12px;line-height:1.65;color:rgba(255,255,255,.42);padding:0 6px 2px;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:14.5px;font-weight:600;cursor:pointer;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease),box-shadow .16s var(--ease);
}
.btn-primary{background:var(--ink);color:#fff;}
.btn-primary:hover{background:var(--signal);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-1);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:#fff;}
.btn-light{background:#fff;color:var(--ink);}
.btn-light:hover{background:var(--signal);color:#fff;transform:translateY(-2px);}
.btn-block{width:100%;}
.btn-sm{padding:9px 15px;font-size:13.5px;}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.45);color:#fff;}
.btn-outline-light:hover{background:#fff;color:var(--ink);border-color:#fff;}
.link-more{color:var(--signal);font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px;}
.link-more:hover{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:2px;}

/* ---------- Layout ---------- */
.main{margin-left:248px;flex:1;min-width:0;display:flex;flex-direction:column;}
.wrap{width:100%;max-width:1280px;margin:0 auto;padding:0 48px;}
.section{padding:74px 0;}
.section-tight{padding:48px 0;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:30px;}
.sec-head h2{font-size:clamp(24px,3vw,34px);letter-spacing:-0.01em;}
.sec-kicker{
  display:inline-flex;align-items:center;gap:7px;margin-bottom:12px;
  font-size:12px;font-weight:700;letter-spacing:.05em;color:var(--signal);
}
.sec-kicker::before{content:"";width:18px;height:3px;background:var(--signal);border-radius:2px;}
.sec-desc{color:var(--muted);font-size:15px;max-width:62ch;margin-top:10px;}

/* ---------- Hero band ---------- */
.hero-band{
  position:relative;overflow:hidden;border-radius:var(--r-card);
  background-image:linear-gradient(rgba(14,20,18,.45),rgba(14,20,18,.62)),url("/assets/images/backpic/back-3.webp");
  background-size:cover;background-position:center;
  min-height:260px;display:flex;flex-direction:column;justify-content:flex-end;
  padding:44px 44px 40px;color:#fff;margin-top:28px;
}
.hero-tag{
  display:inline-flex;align-items:center;gap:8px;align-self:flex-start;
  padding:5px 12px;border-radius:999px;background:var(--signal-soft);color:#B33B0C;
  font-size:12px;font-weight:700;letter-spacing:.03em;margin-bottom:16px;
}
.hero-band h1{font-size:clamp(26px,3.4vw,42px);font-weight:800;letter-spacing:-0.02em;line-height:1.18;max-width:22ch;}
.hero-band .hero-sub{margin-top:14px;font-size:16px;color:rgba(255,255,255,.84);max-width:46ch;line-height:1.75;}
.hero-actions{margin-top:24px;display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- Breadcrumb ---------- */
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);padding:18px 0 0;}
.crumb a:hover{color:var(--signal);}
.crumb .sep{opacity:.5;}
.crumb .now{color:var(--ink);font-weight:600;}

/* ---------- Intro / prose ---------- */
.prose-lead{max-width:74ch;}
.prose-lead p{color:#333B37;margin-bottom:16px;}
.prose-lead p:last-child{margin-bottom:0;}
.fact-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;background:var(--paper);margin-top:32px;}
.fact{padding:22px 20px;border-right:1px solid var(--line);}
.fact:last-child{border-right:0;}
.fact .num{font-family:var(--font-mono);font-size:26px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-0.02em;}
.fact .num span{color:var(--signal);}
.fact .lb{font-size:13px;color:var(--muted);margin-top:4px;}

/* ---------- Cards + sticky aside ---------- */
.grid-aside{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;align-items:start;}
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;}
.g-card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
  display:flex;flex-direction:column;
}
.g-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D6D0C4;}
.g-card .thumb{aspect-ratio:16/10;overflow:hidden;background:#EFECE5;}
.g-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .35s var(--ease);}
.g-card:hover .thumb img{transform:scale(1.03);}
.g-card .body{padding:22px 22px 24px;display:flex;flex-direction:column;gap:10px;flex:1;}
.g-card .idx{font-family:var(--font-mono);font-size:12px;font-weight:700;color:var(--signal);letter-spacing:.04em;}
.g-card h3{font-size:19px;}
.g-card p{font-size:14.5px;color:var(--muted);line-height:1.8;}
.g-card .tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:6px;}
.tag{display:inline-block;padding:4px 10px;border-radius:999px;background:var(--signal-soft);color:#B33B0C;font-size:12px;font-weight:600;}

.aside{position:sticky;top:24px;display:flex;flex-direction:column;gap:18px;}
.aside-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);padding:22px;box-shadow:var(--shadow-1);}
.aside-card h3{font-size:15px;margin-bottom:14px;}
.aside-link{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 0;border-bottom:1px dashed var(--line);font-size:14px;color:#333B37;transition:color .14s var(--ease);}
.aside-link:last-of-type{border-bottom:0;}
.aside-link:hover{color:var(--signal);}
.aside-link .arrow{font-family:var(--font-mono);font-size:13px;color:var(--muted);}
.aside-note{font-size:12.5px;color:var(--muted);line-height:1.7;margin-top:10px;}
.aside-dark{background:var(--ink);border-color:var(--ink);color:#fff;}
.aside-dark h3{color:#fff;}
.aside-dark .aside-note{color:rgba(255,255,255,.6);}
.aside-dark .kv{display:flex;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.72);padding:7px 0;}
.aside-dark .kv b{color:#fff;font-family:var(--font-mono);font-weight:600;}

/* ---------- Dark band / steps ---------- */
.band-dark{background:var(--ink);color:#fff;}
.band-dark .sec-head h2{color:#fff;}
.band-dark .sec-desc{color:rgba(255,255,255,.62);}
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-top:8px;}
.step{background:var(--ink-soft);border:1px solid var(--line-ink);border-radius:var(--r-card);padding:24px 22px;transition:transform .18s var(--ease),background-color .18s var(--ease);}
.step:hover{transform:translateY(-3px);background:#222B27;}
.step .no{font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--signal);letter-spacing:.06em;}
.step h3{font-size:17px;margin:12px 0 8px;color:#fff;}
.step p{font-size:14px;color:rgba(255,255,255,.64);line-height:1.78;}

/* ---------- FAQ ---------- */
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;background:none;border:0;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:56px;padding:16px 2px;text-align:left;
  font-size:16.5px;font-weight:600;color:var(--ink);
  transition:color .16s var(--ease);
}
.faq-q:hover{color:var(--signal);}
.faq-icon{
  flex:0 0 22px;width:22px;height:22px;position:relative;
  transition:transform .2s var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--signal);border-radius:2px;
}
.faq-icon::before{left:0;right:0;top:10px;height:2px;}
.faq-icon::after{top:0;bottom:0;left:10px;width:2px;}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s var(--ease);}
.faq-a p{padding:0 40px 20px 2px;font-size:15px;color:var(--muted);line-height:1.85;}

/* ---------- CTA / cross links ---------- */
.cta-band{
  background:var(--signal-soft);border-radius:var(--r-card);
  padding:40px 44px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);max-width:20ch;}
.cta-band p{color:#7A4527;font-size:15px;margin-top:10px;max-width:50ch;}
.cross-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:26px;}
.cross-card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
  display:block;
}
.cross-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D6D0C4;}
.cross-card .k{font-family:var(--font-mono);font-size:12px;color:var(--muted);letter-spacing:.05em;}
.cross-card h3{font-size:17px;margin:10px 0 8px;}
.cross-card p{font-size:14px;color:var(--muted);line-height:1.78;}
.cross-card .go{margin-top:14px;font-size:13.5px;font-weight:600;color:var(--signal);display:inline-flex;align-items:center;gap:6px;}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#fff;margin-top:auto;padding:64px 0 28px;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:-0.01em;}
.footer-brand .brand-mark{width:26px;height:26px;flex:0 0 26px;}
.footer-about{font-size:13.5px;color:rgba(255,255,255,.55);line-height:1.85;margin-top:14px;max-width:34ch;}
.footer-col h4{font-size:13px;font-weight:700;letter-spacing:.1em;color:rgba(255,255,255,.5);margin-bottom:16px;}
.footer-col li{margin-bottom:10px;}
.footer-col a{font-size:14px;color:rgba(255,255,255,.78);transition:color .16s var(--ease);}
.footer-col a:hover{color:var(--signal);}
.footer-bottom{
  margin-top:48px;padding-top:20px;border-top:1px solid var(--line-ink);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:rgba(255,255,255,.45);
}

/* ---------- Mobile bar + drawer ---------- */
.mobile-bar{
  display:none;position:sticky;top:0;z-index:70;height:56px;
  background:var(--ink);color:#fff;align-items:center;justify-content:space-between;
  padding:0 16px;border-bottom:1px solid var(--line-ink);
}
.mobile-brand{display:flex;align-items:center;gap:9px;font-size:15.5px;font-weight:800;}
.mobile-brand .brand-mark{width:22px;height:22px;flex:0 0 22px;}
.burger{
  width:40px;height:40px;border-radius:8px;border:1px solid var(--line-ink);background:transparent;
  display:inline-flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;
  transition:background-color .16s var(--ease);
}
.burger:hover{background:rgba(255,255,255,.08);}
.drawer{
  position:fixed;top:0;left:0;bottom:0;width:280px;background:var(--ink);color:#fff;
  z-index:90;transform:translateX(-100%);transition:transform .24s var(--ease);
  display:flex;flex-direction:column;padding:22px 16px;overflow-y:auto;
}
.drawer.open{transform:translateX(0);}
.drawer-mask{
  position:fixed;inset:0;background:rgba(14,20,18,.5);z-index:85;
  opacity:0;visibility:hidden;transition:opacity .22s var(--ease),visibility .22s var(--ease);
}
.drawer-mask.open{opacity:1;visibility:visible;}
.drawer .side-foot{margin-top:auto;padding-top:24px;}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(8px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.in{opacity:1;transform:none;}

/* ---------- Responsive ---------- */
@media (max-width:1279px){
  .wrap{padding:0 40px;}
  .grid-aside{grid-template-columns:minmax(0,1fr) 290px;gap:28px;}
}
@media (max-width:1023px){
  .sidebar{display:none;}
  .mobile-bar{display:flex;}
  .main{margin-left:0;}
  .wrap{padding:0 24px;}
  .section{padding:56px 0;}
  .section-tight{padding:36px 0;}
  .hero-band{padding:34px 28px 32px;min-height:220px;margin-top:16px;}
  .fact-row{grid-template-columns:repeat(2,minmax(0,1fr));}
  .fact:nth-child(2){border-right:0;}
  .fact:nth-child(1),.fact:nth-child(2){border-bottom:1px solid var(--line);}
  .grid-aside{grid-template-columns:minmax(0,1fr);}
  .aside{position:static;}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
  .cta-band{padding:32px 28px;}
}
@media (max-width:639px){
  .wrap{padding:0 16px;}
  .hero-band{padding:26px 20px 26px;min-height:200px;border-radius:14px;}
  .hero-band h1{font-size:26px;}
  .hero-band .hero-sub{font-size:15px;}
  .card-grid{grid-template-columns:minmax(0,1fr);}
  .steps{grid-template-columns:minmax(0,1fr);}
  .cross-grid{grid-template-columns:minmax(0,1fr);}
  .fact-row{grid-template-columns:minmax(0,1fr);}
  .fact{border-right:0;border-bottom:1px solid var(--line);}
  .fact:last-child{border-bottom:0;}
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px;}
  .footer-grid{grid-template-columns:1fr;}
  .cta-band{padding:26px 20px;border-radius:14px;}
  .faq-q{font-size:15.5px;}
  .faq-a p{padding-right:8px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
}