/* roulang page: index */
:root{
  --brand:#2F5D8C;
  --brand-dark:#24496F;
  --brand-soft:#E8EFF7;
  --brand-tint:#EEF3F8;
  --accent:#E4795A;
  --accent-soft:#FCEFE9;
  --ink:#16202B;
  --ink-2:#55657A;
  --ink-3:#8A99AB;
  --line:#E2E9F1;
  --line-strong:#CBDCEB;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --r-lg:16px;
  --r-md:12px;
  --r-sm:10px;
  --sh-sm:0 2px 8px rgba(22,32,43,.05);
  --sh-md:0 10px 30px rgba(22,32,43,.07);
  --sh-lg:0 16px 40px rgba(22,32,43,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:14px;}
a{color:var(--brand);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--brand-dark);}
p{margin:0 0 16px;}
h1,h2,h3,h4{margin:0 0 16px;font-weight:700;line-height:1.35;letter-spacing:0;}
ul,ol{margin:0 0 16px;padding-left:20px;}
button{font-family:inherit;}
:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(47,93,140,.28);border-radius:6px;}
.container{width:100%;max-width:1180px;margin:0 auto;padding-left:24px;padding-right:24px;}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;font-size:17px;}
.brand:hover{color:var(--ink);}
.brand-dot{
  width:10px;height:10px;border-radius:50%;
  background:var(--brand);position:relative;flex:0 0 auto;
}
.brand-dot::after{
  content:"";position:absolute;inset:-4px;border:1px solid var(--line-strong);border-radius:50%;
}
.brand-text{white-space:nowrap;}
.site-nav{display:flex;align-items:center;gap:34px;}
.nav-item{
  position:relative;display:inline-block;
  font-size:15px;color:var(--ink-2);
  padding:6px 0;
  transition:color .18s var(--ease);
}
.nav-item:hover{color:var(--ink);}
.nav-item.active{color:var(--ink);font-weight:600;}
.nav-item.active::after{
  content:"";position:absolute;left:50%;bottom:-14px;
  transform:translateX(-50%);
  width:60%;height:2px;border-radius:2px;background:var(--accent);
}
.nav-cta{
  border:1px solid var(--line-strong);
  border-radius:999px;
  padding:8px 22px;
  color:var(--brand);
  font-size:15px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.nav-cta:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-soft);}
.nav-cta.active::after{display:none;}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 10px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  cursor:pointer;
}
.nav-toggle span{display:block;height:1px;background:var(--ink-2);transition:transform .2s var(--ease),opacity .2s var(--ease);}
body.nav-lock{overflow:hidden;}

/* ===== Buttons ===== */
.btn-primary-x{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 26px;
  background:var(--brand);color:#fff;font-size:15px;font-weight:600;
  border:1px solid var(--brand);border-radius:var(--r-sm);
  transition:background .2s var(--ease),box-shadow .2s var(--ease),transform .12s var(--ease);
}
.btn-primary-x:hover{background:var(--brand-dark);color:#fff;box-shadow:var(--sh-md);}
.btn-primary-x:active{transform:translateY(1px);}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 26px;
  background:#fff;color:var(--brand);font-size:15px;font-weight:600;
  border:1px solid var(--line-strong);border-radius:var(--r-sm);
  transition:background .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease);
}
.btn-ghost:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.btn-ghost:active{transform:translateY(1px);}
.btn-line{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:42px;padding:0 20px;
  background:transparent;color:var(--brand);font-size:14px;font-weight:600;
  border:1px solid var(--line-strong);border-radius:999px;
  transition:background .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease);
}
.btn-line:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.btn-line:active{transform:translateY(1px);}
.link-underline{
  position:relative;color:var(--brand);font-weight:600;
  padding-bottom:2px;
}
.link-underline::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--brand);
  transition:width .24s var(--ease);
}
.link-underline:hover::after{width:100%;}

/* ===== Section base ===== */
.section{padding:88px 0;background:#fff;}
.section-soft{background:var(--bg);}
.section-tint{background:var(--brand-tint);}
.section-head{max-width:760px;margin-bottom:40px;}
.eyebrow{
  display:inline-block;margin-bottom:14px;
  font-size:13px;letter-spacing:.04em;color:var(--brand);
  background:var(--brand-soft);border-radius:999px;padding:5px 14px;font-weight:600;
}
.section-head h2{font-size:clamp(22px,2.6vw,32px);color:var(--ink);}
.section-desc{color:var(--ink-2);font-size:15px;margin:0;}
.chip{
  display:inline-block;font-size:13px;line-height:1.6;
  padding:3px 12px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-dark);
}
.chip-accent{background:var(--accent-soft);color:var(--accent);}

/* ===== Hero ===== */
.hero{padding:76px 0 84px;background:#fff;}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.kicker{display:inline-block;font-size:14px;color:var(--ink-2);margin-bottom:18px;letter-spacing:.02em;}
.hero h1{font-size:clamp(28px,4vw,44px);color:var(--ink);margin-bottom:20px;}
.hero-lead{color:var(--ink-2);font-size:16px;margin-bottom:28px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:30px;}
.hero-points{display:flex;flex-wrap:wrap;gap:10px;list-style:none;padding:0;margin:0;}
.hero-points li{
  font-size:13px;color:var(--brand-dark);background:var(--brand-soft);
  border-radius:999px;padding:5px 14px;
}
.hero-media{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.hero-main{
  position:relative;grid-column:1 / -1;
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-md);
}
.hero-main img{width:100%;height:290px;object-fit:cover;border-radius:var(--r-lg);}
.hero-sub{border-radius:14px;overflow:hidden;box-shadow:var(--sh-sm);}
.hero-sub img{width:100%;height:132px;object-fit:cover;}
.tag-float{
  position:absolute;right:14px;bottom:14px;
  display:flex;gap:6px;flex-wrap:wrap;
  background:#fff;border-radius:var(--r-md);
  padding:8px 12px;box-shadow:var(--sh-sm);
}
.tag-float span{font-size:12px;color:var(--brand-dark);background:var(--brand-tint);border-radius:999px;padding:2px 10px;}

/* ===== Download ===== */
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.dl-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:28px 26px 26px;box-shadow:var(--sh-sm);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.dl-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);}
.dl-name{font-size:18px;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:8px;}
.dl-name i{width:8px;height:8px;border-radius:50%;background:var(--accent);display:inline-block;}
.dl-desc{font-size:14px;color:var(--ink-2);margin-bottom:20px;min-height:52px;}

/* ===== Capability strip ===== */
.cap-strip{
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong);
}
.cap-item{padding:28px 24px;border-left:1px solid var(--line-strong);}
.cap-item:first-child{border-left:none;padding-left:0;}
.cap-num{font-size:13px;color:var(--accent);font-weight:700;letter-spacing:.08em;display:block;margin-bottom:10px;}
.cap-title{font-size:17px;font-weight:600;margin-bottom:6px;}
.cap-text{font-size:14px;color:var(--ink-2);margin:0;}

/* ===== Play matrix ===== */
.play-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:20px;}
.play-card{
  display:flex;flex-direction:column;justify-content:space-between;
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px 24px;box-shadow:var(--sh-sm);min-height:180px;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.play-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);}
.play-card h3{font-size:17px;margin-bottom:10px;}
.play-card p{font-size:14px;color:var(--ink-2);margin:0 0 18px;}
.play-arrow{font-size:14px;color:var(--accent);font-weight:700;text-align:right;}
.col-6{grid-column:span 6;}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.play-card.emphasis{background:var(--brand-tint);border-color:var(--line-strong);}

/* ===== Why ===== */
.why-wrap{display:grid;grid-template-columns:0.85fr 1.15fr;gap:56px;align-items:start;}
.why-left h2{font-size:clamp(22px,2.6vw,32px);margin-bottom:14px;}
.why-left p{color:var(--ink-2);font-size:15px;margin:0;}
.why-list{display:flex;flex-direction:column;gap:8px;}
.why-item{
  display:grid;grid-template-columns:72px 1fr;gap:16px;
  padding:22px 0;border-top:1px solid var(--line);
}
.why-item:last-child{border-bottom:1px solid var(--line);}
.why-num{font-size:34px;font-weight:700;color:var(--brand-soft);line-height:1;letter-spacing:-.02em;}
.why-item h3{font-size:17px;margin-bottom:6px;}
.why-item p{font-size:14px;color:var(--ink-2);margin:0;}

/* ===== Flow ===== */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative;}
.flow-step{position:relative;padding:0 22px 0 0;}
.flow-step::before{
  content:"";position:absolute;left:0;top:19px;right:22px;
  border-top:1px dashed var(--line-strong);
}
.flow-step:last-child::before{display:none;}
.flow-dot{
  position:relative;z-index:1;
  width:40px;height:40px;border-radius:50%;
  background:#fff;border:1px solid var(--line-strong);
  color:var(--brand);font-weight:700;font-size:15px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:18px;
}
.flow-name{font-size:17px;font-weight:600;margin-bottom:8px;}
.flow-text{font-size:14px;color:var(--ink-2);margin:0 0 12px;}

/* ===== Topic wall ===== */
.topic-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.topic-card{
  display:block;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);
  color:inherit;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.topic-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);color:inherit;}
.topic-thumb img{width:100%;height:180px;object-fit:cover;border-radius:0;}
.topic-body{padding:20px 22px 22px;}
.topic-body h3{font-size:17px;margin:10px 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.topic-body p{font-size:14px;color:var(--ink-2);margin:0 0 14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.topic-meta{font-size:13px;color:var(--ink-3);}

/* ===== News ===== */
.news-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:32px;align-items:start;}
.news-main{
  display:block;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);color:inherit;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.news-main:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);color:inherit;}
.news-main img{width:100%;height:250px;object-fit:cover;border-radius:0;}
.news-main-body{padding:24px 26px 26px;}
.news-main h3{font-size:20px;margin:10px 0 10px;}
.news-main p{font-size:14px;color:var(--ink-2);margin:0 0 16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-side{display:flex;flex-direction:column;}
.news-item{
  display:block;padding:18px 4px;border-bottom:1px solid var(--line);color:inherit;
  transition:background .2s var(--ease);
}
.news-item:first-child{padding-top:0;}
.news-item:hover{color:inherit;background:var(--bg);}
.news-item h4{font-size:16px;margin:0 0 6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-item p{font-size:13px;color:var(--ink-2);margin:0 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-item .topic-meta{font-size:12px;}
.empty-state{
  background:var(--card);border:1px dashed var(--line-strong);border-radius:var(--r-lg);
  padding:48px 24px;text-align:center;color:var(--ink-2);font-size:15px;
}
.empty-state strong{display:block;color:var(--ink);font-size:17px;margin-bottom:8px;}

/* ===== Tag cloud ===== */
.tagcloud{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px;}
.tag{
  display:inline-block;font-size:13px;padding:6px 16px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-dark);border:1px solid transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.tag:hover{background:var(--brand);color:#fff;border-color:var(--brand);}
.tag.alt{background:#fff;color:var(--brand-dark);border-color:var(--line-strong);}
.tag.alt:hover{background:var(--brand-dark);color:#fff;border-color:var(--brand-dark);}

/* ===== Channel grid ===== */
.channel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.channel-card{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);
  padding:22px 22px;color:inherit;box-shadow:var(--sh-sm);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.channel-card:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:var(--line-strong);color:inherit;}
.channel-card h3{font-size:16px;margin:0 0 4px;}
.channel-card p{font-size:13px;color:var(--ink-2);margin:0;}
.channel-arrow{color:var(--accent);font-weight:700;font-size:15px;flex:0 0 auto;}

/* ===== Rhythm ===== */
.rhythm{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.rhythm-item{
  position:relative;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-md);padding:24px 22px;box-shadow:var(--sh-sm);
}
.rhythm-item::before{
  content:"";position:absolute;left:22px;top:-1px;width:34px;height:2px;background:var(--accent);
}
.rhythm-day{font-size:14px;color:var(--brand);font-weight:700;margin-bottom:10px;}
.rhythm-item h3{font-size:16px;margin-bottom:8px;}
.rhythm-item p{font-size:14px;color:var(--ink-2);margin:0;}

/* ===== Steps ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.step-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:28px 26px;box-shadow:var(--sh-sm);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);}
.step-num{font-size:13px;letter-spacing:.1em;color:var(--accent);font-weight:700;display:block;margin-bottom:12px;}
.step-card h3{font-size:17px;margin-bottom:8px;}
.step-card p{font-size:14px;color:var(--ink-2);margin:0 0 14px;}

/* ===== FAQ ===== */
.faq{max-width:880px;}
.faq-item{border-top:1px solid var(--line);}
.faq-item:last-child{border-bottom:1px solid var(--line);}
.faq-item summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:22px 0;font-size:16px;font-weight:600;color:var(--ink);
  transition:color .2s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--brand);}
.faq-item[open] summary{color:var(--brand);}
.faq-item summary::after{
  content:"+";font-size:20px;font-weight:400;color:var(--ink-3);
  transition:transform .22s var(--ease),color .22s var(--ease);flex:0 0 auto;
}
.faq-item[open] summary::after{transform:rotate(45deg);color:var(--brand);}
.faq-a{padding:0 0 22px;font-size:15px;line-height:1.85;color:var(--ink-2);max-width:760px;}

/* ===== Safety band ===== */
.safety-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:48px;align-items:center;}
.safety-grid h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px;}
.safety-grid .section-desc{font-size:15px;}
.safety-list{display:flex;flex-direction:column;gap:16px;}
.safety-item{display:grid;grid-template-columns:26px 1fr;gap:12px;font-size:15px;color:var(--ink-2);}
.safety-item span.dot{
  width:8px;height:8px;border-radius:50%;background:var(--accent);margin-top:11px;
}

/* ===== CTA band ===== */
.cta-band{
  border:1px solid var(--line-strong);border-radius:var(--r-lg);
  background:#fff;padding:56px 32px;text-align:center;box-shadow:var(--sh-sm);
}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:14px;}
.cta-band p{color:var(--ink-2);font-size:15px;max-width:680px;margin:0 auto 26px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:22px;}
.cta-dl-links{display:flex;flex-wrap:wrap;gap:22px;justify-content:center;font-size:14px;}
.cta-dl-links a{color:var(--brand);}

/* ===== Footer ===== */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:64px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;}
.footer-brand .brand{margin-bottom:14px;}
.footer-brand p{font-size:14px;color:var(--ink-2);margin:0 0 16px;max-width:300px;}
.footer-dl{display:flex;flex-direction:column;gap:6px;font-size:14px;}
.footer-dl a{color:var(--brand);}
.footer-col h4{font-size:15px;margin:0 0 16px;color:var(--ink);}
.footer-links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px;}
.footer-links a{font-size:14px;color:var(--ink-2);}
.footer-links a:hover{color:var(--brand);}
.footer-bottom{
  border-top:1px solid var(--line);padding:22px 0;
  font-size:13px;color:var(--ink-3);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
}
.footer-bottom span{display:inline-block;}

/* ===== Responsive ===== */
@media (max-width:1199px){
  .hero-grid{gap:40px;}
}
@media (max-width:991px){
  .header-inner{height:60px;}
  .nav-toggle{display:flex;}
  .site-nav{
    position:fixed;left:0;right:0;top:60px;bottom:0;
    background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:8px 24px 40px;overflow-y:auto;
    border-top:1px solid var(--line);
    opacity:0;pointer-events:none;transform:translateY(-8px);
    transition:opacity .22s var(--ease),transform .22s var(--ease);
  }
  .site-nav.open{opacity:1;pointer-events:auto;transform:none;}
  .nav-item{
    display:flex;align-items:center;height:56px;font-size:17px;
    border-bottom:1px solid var(--line);padding:0;
  }
  .nav-item.active{color:var(--brand);}
  .nav-item.active::after{display:none;}
  .nav-cta{margin-top:18px;height:48px;justify-content:center;border-radius:var(--r-sm);}
  .section{padding:72px 0;}
  .hero{padding:52px 0 64px;}
  .hero-grid{grid-template-columns:1fr;gap:34px;}
  .hero-media{order:-1;}
  .hero-main img{height:230px;}
  .hero-sub img{height:118px;}
  .dl-grid{grid-template-columns:1fr;gap:16px;}
  .dl-desc{min-height:0;}
  .cap-strip{grid-template-columns:repeat(2,1fr);}
  .cap-item{padding:22px 20px;}
  .cap-item:nth-child(3){border-left:none;padding-left:0;}
  .cap-item:nth-child(3),.cap-item:nth-child(4){border-top:1px solid var(--line-strong);}
  .col-6,.col-3,.col-4{grid-column:span 6;}
  .why-wrap{grid-template-columns:1fr;gap:32px;}
  .flow{grid-template-columns:1fr;gap:0;}
  .flow-step{padding:0 0 26px 52px;}
  .flow-step::before{
    left:19px;top:8px;bottom:-8px;right:auto;width:1px;height:auto;
    border-top:none;border-left:1px dashed var(--line-strong);
  }
  .flow-dot{position:absolute;left:0;top:0;margin:0;}
  .flow-name{margin-top:4px;}
  .topic-wall{grid-template-columns:repeat(2,1fr);}
  .news-grid{grid-template-columns:1fr;gap:24px;}
  .channel-grid{grid-template-columns:repeat(2,1fr);}
  .rhythm{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:1fr;}
  .safety-grid{grid-template-columns:1fr;gap:26px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:767px){
  .container{padding-left:20px;padding-right:20px;}
  .section{padding:64px 0;}
  .topic-wall{grid-template-columns:1fr;}
  .channel-grid{grid-template-columns:1fr;}
  .rhythm{grid-template-columns:1fr;}
  .cap-strip{grid-template-columns:1fr;}
  .cap-item{border-left:none;padding-left:0;}
  .cap-item + .cap-item{border-top:1px solid var(--line-strong);}
  .cta-band{padding:40px 22px;}
  .hero-actions .btn-primary-x,.hero-actions .btn-ghost{flex:1 1 auto;}
}
@media (max-width:575px){
  .col-6,.col-3,.col-4{grid-column:span 12;}
  .topic-thumb img{height:170px;}
  .hero-main img{height:200px;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;}
  .play-card{min-height:0;}
}

/* roulang page: category1 */
:root{
  --brand:#2F5D8C;
  --brand-dark:#24496F;
  --brand-soft:#E8EFF7;
  --brand-tint:#EEF3F8;
  --accent:#E4795A;
  --accent-soft:#FCEFE9;
  --ink:#16202B;
  --ink-2:#55657A;
  --ink-3:#8A99AB;
  --line:#E2E9F1;
  --line-strong:#CBDCEB;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --r-lg:16px;
  --r-md:12px;
  --r-sm:10px;
  --sh-sm:0 2px 8px rgba(22,32,43,.05);
  --sh-md:0 10px 30px rgba(22,32,43,.07);
  --sh-lg:0 16px 40px rgba(22,32,43,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;line-height:1.8;color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0 0 14px;line-height:1.4;font-weight:700;letter-spacing:0;color:var(--ink);}
p{margin:0 0 16px;}
img{max-width:100%;height:auto;display:block;border-radius:14px;}
a{color:var(--brand);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--brand-dark);}
button{font-family:inherit;}
ul{margin:0;padding:0;list-style:none;}
a:focus-visible,button:focus-visible,.accordion-button:focus-visible{
  outline:3px solid rgba(47,93,140,.28);outline-offset:2px;border-radius:8px;
}
.container{width:100%;max-width:1180px;margin:0 auto;padding-left:24px;padding-right:24px;}
/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line);}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;position:relative;}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;font-size:17px;}
.brand:hover{color:var(--ink);}
.brand-dot{width:10px;height:10px;border-radius:50%;background:var(--brand);position:relative;flex:0 0 auto;}
.brand-dot::after{content:"";position:absolute;inset:-4px;border:1px solid var(--line-strong);border-radius:50%;}
.brand-text{white-space:nowrap;}
.site-nav{display:flex;align-items:center;gap:34px;}
.nav-item{position:relative;display:inline-block;font-size:15px;color:var(--ink-2);padding:6px 0;transition:color .18s var(--ease);}
.nav-item:hover{color:var(--ink);}
.nav-item.active{color:var(--ink);font-weight:600;}
.nav-item.active::after{content:"";position:absolute;left:50%;bottom:-14px;transform:translateX(-50%);width:60%;height:2px;border-radius:2px;background:var(--accent);}
.nav-cta{border:1px solid var(--line-strong);border-radius:999px;padding:8px 22px;color:var(--brand);font-size:15px;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);}
.nav-cta:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-soft);}
.nav-cta.active::after{display:none;}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;padding:0 10px;background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);cursor:pointer;}
.nav-toggle span{display:block;height:1px;background:var(--ink-2);transition:transform .2s var(--ease),opacity .2s var(--ease);}
body.nav-lock{overflow:hidden;}
/* ===== Buttons ===== */
.btn-primary-x,.btn-ghost,.btn-line{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:15px;font-weight:600;border-radius:var(--r-sm);transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease),transform .12s var(--ease);}
.btn-primary-x{min-height:46px;padding:0 26px;background:var(--brand);color:#fff;border:1px solid var(--brand);}
.btn-primary-x:hover{background:var(--brand-dark);color:#fff;border-color:var(--brand-dark);box-shadow:var(--sh-md);}
.btn-primary-x:active{transform:translateY(1px);}
.btn-ghost{min-height:46px;padding:0 26px;background:#fff;color:var(--brand);border:1px solid var(--line-strong);}
.btn-ghost:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.btn-ghost:active{transform:translateY(1px);}
.btn-line{min-height:42px;padding:0 20px;background:transparent;color:var(--brand);font-size:14px;border:1px solid var(--line-strong);border-radius:999px;}
.btn-line:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.btn-line:active{transform:translateY(1px);}
/* ===== Section base ===== */
.section{padding:88px 0;background:#fff;}
.section-soft{background:var(--bg);}
.section-tint{background:var(--brand-tint);}
.section-head{max-width:760px;margin-bottom:40px;}
.eyebrow{display:inline-block;margin-bottom:14px;font-size:13px;letter-spacing:.04em;color:var(--brand);background:var(--brand-soft);border-radius:999px;padding:5px 14px;font-weight:600;}
.section-head h2{font-size:clamp(22px,2.6vw,32px);}
.section-desc{color:var(--ink-2);font-size:15px;margin:0;}
.chip{display:inline-block;font-size:13px;line-height:1.6;padding:3px 12px;border-radius:999px;background:var(--brand-soft);color:var(--brand-dark);}
.chip-accent{background:var(--accent-soft);color:var(--accent);}
/* ===== Category hero ===== */
.cat-hero{padding:52px 0 56px;background:#fff;border-bottom:1px solid var(--line);}
.cat-hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;align-items:center;}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-3);margin-bottom:20px;}
.crumbs a{color:var(--ink-2);}
.crumbs a:hover{color:var(--brand);}
.crumbs .sep{color:var(--line-strong);}
.cat-hero h1{font-size:clamp(26px,3.4vw,38px);margin-bottom:16px;}
.cat-hero .lead{color:var(--ink-2);font-size:16px;margin:0 0 10px;max-width:640px;}
.cat-hero .lead:last-of-type{margin-bottom:0;}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;}
.hero-tags span{font-size:13px;color:var(--brand-dark);background:var(--brand-tint);border-radius:999px;padding:4px 14px;}
.cat-hero-media{border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-md);background:#fff;}
.cat-hero-media img{width:100%;height:200px;object-fit:cover;border-radius:var(--r-lg);}
/* ===== Filter bar ===== */
.filter-bar{background:#fff;border-bottom:1px solid var(--line);padding:16px 0;}
.filter-inner{display:flex;flex-wrap:wrap;gap:10px;align-items:center;}
.filter-pill{display:inline-block;font-size:14px;padding:7px 18px;border-radius:999px;border:1px solid var(--line-strong);background:#fff;color:var(--ink-2);transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);cursor:default;user-select:none;}
.filter-pill:hover{border-color:var(--brand);color:var(--brand);}
.filter-pill.is-active{background:var(--brand);border-color:var(--brand);color:#fff;}
.filter-pill.is-active:hover{color:#fff;border-color:var(--brand);}
.filter-count{margin-left:auto;font-size:13px;color:var(--ink-3);}
/* ===== List layout ===== */
.list-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:40px;align-items:start;}
.post-row{display:grid;grid-template-columns:240px minmax(0,1fr);gap:22px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);padding:20px;margin-bottom:20px;transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);}
.post-row:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:var(--line-strong);}
.post-thumb{display:block;border-radius:var(--r-md);overflow:hidden;}
.post-thumb img{width:100%;height:152px;object-fit:cover;border-radius:var(--r-md);transition:transform .3s var(--ease);}
.post-row:hover .post-thumb img{transform:scale(1.03);}
.post-body{min-width:0;}
.post-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px;}
.post-title{font-size:18px;line-height:1.5;margin:0 0 10px;font-weight:700;}
.post-title a{color:var(--ink);}
.post-title a:hover{color:var(--brand);}
.post-excerpt{color:var(--ink-2);font-size:14px;line-height:1.85;margin:0 0 14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:14px;font-size:13px;color:var(--ink-3);padding-top:12px;border-top:1px solid var(--line);}
.post-meta .more{margin-left:auto;color:var(--brand);font-weight:600;}
.post-meta .more:hover{color:var(--brand-dark);}
.empty-state{background:#fff;border:1px dashed var(--line-strong);border-radius:var(--r-lg);padding:56px 24px;text-align:center;color:var(--ink-2);}
.empty-state strong{display:block;color:var(--ink);font-size:17px;margin-bottom:8px;}
/* ===== Sidebar ===== */
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);padding:24px;margin-bottom:22px;}
.side-card h3{font-size:17px;margin-bottom:16px;}
.rec-list li{display:flex;flex-direction:column;gap:2px;padding:12px 0;border-top:1px solid var(--line);}
.rec-list li:first-child{border-top:0;padding-top:0;}
.rec-list a{font-size:14px;line-height:1.6;color:var(--ink);}
.rec-list a:hover{color:var(--brand);}
.rec-date{font-size:12px;color:var(--ink-3);}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;}
.tag-cloud span{font-size:13px;color:var(--brand-dark);background:var(--brand-tint);border-radius:999px;padding:4px 12px;transition:background .2s var(--ease),color .2s var(--ease);}
.tag-cloud span:hover{background:var(--brand);color:#fff;}
.side-note{font-size:14px;color:var(--ink-2);line-height:1.85;margin:0;}
.side-dl{display:flex;flex-direction:column;gap:10px;}
.side-dl a{display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:600;border:1px solid var(--line-strong);border-radius:var(--r-sm);padding:11px 16px;color:var(--brand);transition:background .2s var(--ease),border-color .2s var(--ease);}
.side-dl a:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.side-dl a span{color:var(--ink-3);font-weight:400;font-size:13px;}
/* ===== Topic cards ===== */
.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.topic-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);overflow:hidden;transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);}
.topic-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md);border-color:var(--line-strong);}
.topic-card img{width:100%;height:168px;object-fit:cover;border-radius:0;}
.topic-card-body{padding:22px;}
.topic-card h3{font-size:17px;margin-bottom:10px;}
.topic-card p{font-size:14px;color:var(--ink-2);margin:0 0 16px;}
.topic-link{font-size:14px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:6px;}
.topic-link:hover{color:var(--brand-dark);}
.topic-link::after{content:"→";transition:transform .2s var(--ease);}
.topic-link:hover::after{transform:translateX(3px);}
/* ===== FAQ ===== */
.accordion-x{border-top:1px solid var(--line);}
.accordion-x .accordion-item{border:0;border-bottom:1px solid var(--line);background:transparent;}
.accordion-x .accordion-button{position:relative;width:100%;background:transparent;border:0;box-shadow:none;color:var(--ink);font-size:16px;font-weight:600;text-align:left;padding:20px 48px 20px 0;line-height:1.7;border-radius:0;}
.accordion-x .accordion-button:not(.collapsed){color:var(--brand);background:transparent;box-shadow:none;}
.accordion-x .accordion-button::after{content:"";position:absolute;right:8px;top:50%;width:12px;height:12px;margin:0;transform:translateY(-50%);background:linear-gradient(var(--brand),var(--brand)) center/12px 1px no-repeat,linear-gradient(var(--brand),var(--brand)) center/1px 12px no-repeat;transition:transform .25s var(--ease);}
.accordion-x .accordion-button:not(.collapsed)::after{transform:translateY(-50%) rotate(45deg);background:linear-gradient(var(--accent),var(--accent)) center/12px 1px no-repeat,linear-gradient(var(--accent),var(--accent)) center/1px 12px no-repeat;}
.accordion-x .accordion-body{padding:0 48px 22px 0;font-size:15px;line-height:1.85;color:var(--ink-2);}
/* ===== Channel entries ===== */
.channel-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px;}
.channel-card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:20px 18px;transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);}
.channel-card:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:var(--line-strong);}
.channel-card strong{display:block;font-size:15px;color:var(--ink);margin-bottom:6px;}
.channel-card span{font-size:13px;color:var(--ink-2);line-height:1.7;display:block;}
.channel-card:hover strong{color:var(--brand);}
/* ===== Notice bar ===== */
.notice-bar{background:var(--brand-tint);border-radius:var(--r-lg);padding:32px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:28px;align-items:center;}
.notice-bar h2{font-size:20px;margin:0;}
.notice-list li{font-size:14px;color:var(--ink-2);line-height:1.85;padding-left:16px;position:relative;margin-bottom:8px;}
.notice-list li:last-child{margin-bottom:0;}
.notice-list li::before{content:"";position:absolute;left:0;top:12px;width:6px;height:6px;border-radius:50%;background:var(--accent);}
/* ===== CTA ===== */
.cta-panel{background:#fff;border:1px solid var(--line-strong);border-radius:var(--r-lg);box-shadow:var(--sh-sm);padding:52px 32px;text-align:center;}
.cta-panel h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px;}
.cta-panel p{color:var(--ink-2);font-size:15px;max-width:640px;margin:0 auto 26px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:22px;}
.cta-links{display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:center;font-size:14px;}
.cta-links a{color:var(--brand);border-bottom:1px solid transparent;transition:border-color .2s var(--ease),color .2s var(--ease);}
.cta-links a:hover{color:var(--brand-dark);border-bottom-color:var(--brand-dark);}
/* ===== Footer ===== */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:64px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;padding-bottom:44px;}
.footer-brand p{font-size:14px;color:var(--ink-2);margin:16px 0 18px;max-width:320px;}
.footer-dl{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:14px;}
.footer-dl a{color:var(--brand);}
.footer-dl a:hover{color:var(--brand-dark);}
.footer-col h4{font-size:15px;margin-bottom:16px;color:var(--ink);}
.footer-links li{margin-bottom:10px;}
.footer-links a{font-size:14px;color:var(--ink-2);}
.footer-links a:hover{color:var(--brand);}
.footer-bottom{border-top:1px solid var(--line);padding:20px 0 28px;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:13px;color:var(--ink-3);}
/* ===== Responsive ===== */
@media (max-width:1199.98px){
  .channel-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
}
@media (max-width:991.98px){
  .section{padding:72px 0;}
  .nav-toggle{display:flex;}
  .site-nav{position:fixed;left:0;right:0;top:60px;bottom:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 48px;transform:translateX(100%);transition:transform .28s var(--ease);overflow-y:auto;z-index:70;}
  .site-nav.is-open{transform:translateX(0);}
  .nav-item{font-size:17px;line-height:56px;padding:0;border-bottom:1px solid var(--line);color:var(--ink-2);}
  .nav-item.active::after{display:none;}
  .nav-item.active{color:var(--brand);}
  .nav-cta{margin-top:20px;text-align:center;line-height:46px;border-radius:999px;}
  .header-inner{height:60px;}
  .cat-hero-grid{grid-template-columns:1fr;gap:28px;}
  .cat-hero-media{max-width:420px;}
  .list-layout{grid-template-columns:1fr;gap:32px;}
  .topic-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .notice-bar{grid-template-columns:1fr;gap:18px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:767.98px){
  .container{padding-left:16px;padding-right:16px;}
  .section{padding:56px 0;}
  .cat-hero{padding:36px 0 40px;}
  .post-row{grid-template-columns:1fr;padding:16px;gap:16px;}
  .post-thumb img{height:180px;}
  .topic-grid{grid-template-columns:1fr;}
  .channel-grid{grid-template-columns:1fr 1fr;}
  .cta-panel{padding:40px 20px;}
  .cta-actions .btn-primary-x,.cta-actions .btn-ghost{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .filter-count{margin-left:0;}
}
@media (max-width:575.98px){
  .channel-grid{grid-template-columns:1fr;}
  .post-thumb img{height:160px;}
  .hero-tags span{font-size:12px;}
}

/* roulang page: article */
:root{
  --brand:#2F5D8C;
  --brand-dark:#24496F;
  --brand-soft:#E8EFF7;
  --brand-tint:#EEF3F8;
  --accent:#E4795A;
  --accent-soft:#FCEFE9;
  --ink:#16202B;
  --ink-2:#55657A;
  --ink-3:#8A99AB;
  --line:#E2E9F1;
  --line-strong:#CBDCEB;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --r-lg:16px;
  --r-md:12px;
  --r-sm:10px;
  --sh-sm:0 2px 8px rgba(22,32,43,.05);
  --sh-md:0 10px 30px rgba(22,32,43,.07);
  --sh-lg:0 16px 40px rgba(22,32,43,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:14px;}
a{color:var(--brand);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--brand-dark);}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;line-height:1.4;font-weight:700;color:var(--ink);}
p{margin:0;}
ul,ol{margin:0;}
.container{width:100%;max-width:1180px;margin:0 auto;padding-left:24px;padding-right:24px;}
a:focus-visible,button:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(47,93,140,.28);border-radius:6px;}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;font-size:17px;}
.brand:hover{color:var(--ink);}
.brand-dot{
  width:10px;height:10px;border-radius:50%;
  background:var(--brand);position:relative;flex:0 0 auto;
}
.brand-dot::after{
  content:"";position:absolute;inset:-4px;border:1px solid var(--line-strong);border-radius:50%;
}
.brand-text{white-space:nowrap;}
.site-nav{display:flex;align-items:center;gap:34px;}
.nav-item{
  position:relative;display:inline-block;
  font-size:15px;color:var(--ink-2);
  padding:6px 0;
  transition:color .18s var(--ease);
}
.nav-item:hover{color:var(--ink);}
.nav-item.active{color:var(--ink);font-weight:600;}
.nav-item.active::after{
  content:"";position:absolute;left:50%;bottom:-14px;
  transform:translateX(-50%);
  width:60%;height:2px;border-radius:2px;background:var(--accent);
}
.nav-cta{
  border:1px solid var(--line-strong);
  border-radius:999px;
  padding:8px 22px;
  color:var(--brand);
  font-size:15px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.nav-cta:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-soft);}
.nav-cta.active::after{display:none;}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 10px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  cursor:pointer;
}
.nav-toggle span{display:block;height:1px;background:var(--ink-2);transition:transform .2s var(--ease),opacity .2s var(--ease);}
body.nav-lock{overflow:hidden;}

/* ===== Buttons ===== */
.btn-primary-x{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 26px;
  background:var(--brand);color:#fff;font-size:15px;font-weight:600;
  border:1px solid var(--brand);border-radius:var(--r-sm);
  transition:background .2s var(--ease),box-shadow .2s var(--ease),transform .12s var(--ease);
}
.btn-primary-x:hover{background:var(--brand-dark);color:#fff;box-shadow:var(--sh-md);}
.btn-primary-x:active{transform:translateY(1px);}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 26px;
  background:#fff;color:var(--brand);font-size:15px;font-weight:600;
  border:1px solid var(--line-strong);border-radius:var(--r-sm);
  transition:background .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease);
}
.btn-ghost:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.btn-ghost:active{transform:translateY(1px);}
.btn-line{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:42px;padding:0 20px;
  background:transparent;color:var(--brand);font-size:14px;font-weight:600;
  border:1px solid var(--line-strong);border-radius:999px;
  transition:background .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease);
}
.btn-line:hover{background:var(--brand-soft);border-color:var(--brand-soft);color:var(--brand-dark);}
.btn-line:active{transform:translateY(1px);}

/* ===== Section base ===== */
.section{padding:80px 0;background:#fff;}
.section-soft{background:var(--bg);}
.section-tint{background:var(--brand-tint);}
.section-head{max-width:760px;margin-bottom:36px;}
.eyebrow{
  display:inline-block;margin-bottom:14px;
  font-size:13px;letter-spacing:.04em;color:var(--brand);
  background:var(--brand-soft);border-radius:999px;padding:5px 14px;font-weight:600;
}
.section-head h2{font-size:clamp(22px,2.6vw,32px);color:var(--ink);}
.section-desc{color:var(--ink-2);font-size:15px;margin-top:10px;}
.chip{
  display:inline-block;font-size:13px;line-height:1.6;
  padding:3px 12px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-dark);
}
.chip-accent{background:var(--accent-soft);color:var(--accent);}
.chip-ghost{background:#fff;border:1px solid var(--line);color:var(--ink-2);}

/* ===== Article head ===== */
.article-hero{padding:48px 0 32px;background:#fff;border-bottom:1px solid var(--line);}
.breadcrumb-x{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-3);margin-bottom:18px;}
.breadcrumb-x a{color:var(--ink-2);}
.breadcrumb-x a:hover{color:var(--brand);}
.breadcrumb-x .sep{color:var(--line-strong);}
.breadcrumb-x .current{color:var(--ink-3);}
.article-hero h1{
  font-size:clamp(24px,3.2vw,38px);
  line-height:1.36;
  max-width:920px;
  margin-bottom:20px;
  letter-spacing:0;
}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding-top:16px;border-top:1px solid var(--line);
  font-size:14px;color:var(--ink-2);
}
.article-meta .meta-sep{width:1px;height:14px;background:var(--line);}
.article-meta .pub{color:var(--ink-3);}

/* ===== Article content ===== */
.article-body{padding:48px 0 56px;background:#fff;}
.article-wrap{max-width:760px;margin:0 auto;}
.article-content{font-size:16px;line-height:1.9;color:var(--ink);word-break:break-word;}
.article-content > * + *{margin-top:20px;}
.article-content h2{font-size:24px;line-height:1.5;margin-top:38px;font-weight:700;}
.article-content h3{font-size:19px;line-height:1.6;margin-top:28px;font-weight:600;}
.article-content h4{font-size:17px;margin-top:22px;font-weight:600;}
.article-content p{color:var(--ink);}
.article-content img{width:100%;height:auto;border-radius:var(--r-md);margin:24px 0;}
.article-content ul,.article-content ol{padding-left:1.4em;color:var(--ink);}
.article-content li + li{margin-top:8px;}
.article-content blockquote{
  border-left:3px solid var(--brand);
  background:var(--brand-tint);
  padding:16px 20px;
  border-radius:0 12px 12px 0;
  color:var(--ink-2);
  margin:24px 0;
}
.article-content blockquote p{color:var(--ink-2);}
.article-content a{text-decoration:underline;text-underline-offset:3px;}
.article-content figure{margin:24px 0;}
.article-content figcaption{font-size:13px;color:var(--ink-3);text-align:center;margin-top:8px;line-height:1.7;}
.article-content table{width:100%;border-collapse:collapse;font-size:15px;margin:24px 0;}
.article-content th,.article-content td{border:1px solid var(--line);padding:10px 12px;text-align:left;}
.article-content th{background:var(--brand-tint);font-weight:600;}
.empty-state{
  padding:56px 24px;border:1px dashed var(--line-strong);
  border-radius:var(--r-lg);text-align:center;background:#fff;
}
.empty-state h2{font-size:20px;margin-bottom:10px;}
.empty-state p{color:var(--ink-2);font-size:15px;margin-bottom:20px;}

/* ===== Tags ===== */
.article-tags{padding:0 0 56px;background:#fff;}
.tag-line{
  max-width:760px;margin:0 auto;
  border-top:1px solid var(--line);
  padding-top:22px;
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
}
.tag-line .label{font-size:14px;color:var(--ink-3);margin-right:2px;}

/* ===== Related ===== */
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.post-card{
  position:relative;
  display:block;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:24px 22px 52px;
  box-shadow:var(--sh-sm);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);}
.post-card h3{font-size:17px;line-height:1.6;color:var(--ink);margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.post-card .date{font-size:13px;color:var(--ink-3);}
.post-card .card-arrow{
  position:absolute;left:22px;bottom:20px;
  font-size:15px;color:var(--accent);
  transition:transform .22s var(--ease);
}
.post-card:hover .card-arrow{transform:translateX(4px);}

/* ===== Angles ===== */
.angle-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.angle-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  overflow:hidden;
  box-shadow:var(--sh-sm);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.angle-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--line-strong);}
.angle-card img{width:100%;height:180px;object-fit:cover;border-radius:0;}
.angle-body{padding:20px 22px 24px;}
.angle-body h3{font-size:17px;margin-bottom:10px;}
.angle-body p{font-size:14px;color:var(--ink-2);line-height:1.85;}

/* ===== Notice strip ===== */
.notice-strip{background:var(--brand-tint);padding:44px 0;}
.notice-inner{display:flex;flex-wrap:wrap;align-items:flex-start;gap:28px 40px;}
.notice-title{flex:1 1 260px;}
.notice-title h2{font-size:22px;line-height:1.5;}
.notice-items{flex:2 1 420px;display:grid;gap:10px;}
.notice-items p{font-size:14px;color:var(--ink-2);line-height:1.85;padding-left:16px;position:relative;}
.notice-items p::before{
  content:"";position:absolute;left:0;top:11px;
  width:6px;height:6px;border-radius:50%;background:var(--accent);
}
.notice-link{flex:0 0 auto;align-self:center;}
.link-underline{
  position:relative;display:inline-block;
  font-size:14px;color:var(--brand);font-weight:600;
}
.link-underline::after{
  content:"";position:absolute;left:0;bottom:-3px;width:100%;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.link-underline:hover::after{transform:scaleX(1);}

/* ===== Back links ===== */
.back-links{padding:44px 0;background:#fff;}
.back-inner{display:flex;flex-wrap:wrap;justify-content:center;gap:18px 36px;}
.back-inner a{font-size:15px;font-weight:600;}

/* ===== Download CTA ===== */
.dl-cta{padding:0 0 88px;background:#fff;}
.dl-cta-box{
  border:1px solid var(--line-strong);
  border-radius:var(--r-lg);
  background:#fff;
  box-shadow:var(--sh-sm);
  padding:48px 36px;
  text-align:center;
}
.dl-cta-box h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px;}
.dl-cta-box .lead{font-size:15px;color:var(--ink-2);max-width:640px;margin:0 auto;}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:32px;text-align:left;}
.dl-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:22px 20px 20px;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.dl-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md);border-color:var(--line-strong);}
.dl-card h3{font-size:16px;margin-bottom:6px;}
.dl-card p{font-size:13px;color:var(--ink-2);line-height:1.75;margin-bottom:16px;}
.dl-card .btn-line{width:100%;}

/* ===== Footer ===== */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:64px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px;}
.footer-brand p{color:var(--ink-2);font-size:14px;margin:14px 0 18px;max-width:330px;line-height:1.85;}
.footer-dl{display:flex;flex-wrap:wrap;gap:8px 18px;}
.footer-dl a{font-size:14px;color:var(--brand);}
.footer-col h4{font-size:15px;font-weight:600;color:var(--ink);margin-bottom:14px;}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:10px;}
.footer-links a{font-size:14px;color:var(--ink-2);}
.footer-links a:hover{color:var(--brand);}
.footer-bottom{
  border-top:1px solid var(--line);
  padding:18px 0;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;
  font-size:13px;color:var(--ink-3);
}

/* ===== Responsive ===== */
@media (max-width: 1199.98px){
  .section{padding:72px 0;}
}
@media (max-width: 991.98px){
  .section{padding:64px 0;}
  .header-inner{height:60px;}
  .nav-toggle{display:flex;}
  .site-nav{
    position:fixed;left:0;right:0;top:60px;bottom:0;
    background:#fff;
    flex-direction:column;align-items:stretch;gap:0;
    padding:8px 24px 48px;
    transform:translateY(-8px);
    opacity:0;visibility:hidden;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
    overflow-y:auto;
    z-index:55;
  }
  .site-nav.open{opacity:1;visibility:visible;transform:none;}
  .nav-item{
    display:flex;align-items:center;
    min-height:56px;padding:14px 0;font-size:17px;
    border-bottom:1px solid var(--line);
  }
  .nav-item.active{color:var(--brand);}
  .nav-item.active::after{display:none;}
  .nav-cta{margin-top:20px;justify-content:center;border:1px solid var(--line-strong);padding:12px 22px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .related-grid,.angle-grid{grid-template-columns:repeat(2,1fr);}
  .dl-grid{grid-template-columns:1fr;}
  .article-hero h1{max-width:100%;}
}
@media (max-width: 767.98px){
  .container{padding-left:20px;padding-right:20px;}
  .section{padding:56px 0;}
  .related-grid,.angle-grid{grid-template-columns:1fr;}
  .dl-cta-box{padding:36px 20px;}
  .notice-inner{flex-direction:column;gap:20px;}
  .notice-link{align-self:flex-start;}
  .article-body{padding:36px 0 44px;}
  .article-content{font-size:16px;}
  .footer-bottom{flex-direction:column;}
}
@media (max-width: 575.98px){
  .container{padding-left:16px;padding-right:16px;}
  .brand-text{font-size:15px;}
  .article-hero{padding:36px 0 26px;}
  .article-meta{font-size:13px;gap:8px;}
  .angle-card img{height:160px;}
  .post-card{padding:20px 18px 50px;}
  .post-card .card-arrow{left:18px;bottom:18px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .btn-primary-x,.btn-ghost{width:100%;}
}