/* roulang page: index */
:root{
  --copper-600:#C0562B;
  --copper-700:#A6461F;
  --copper-50:#FBEEE7;
  --amber:#E0A03C;
  --signal-600:#1E8C6E;
  --signal-50:#E7F4F0;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --danger:#B3261E;
  --r-card:14px;
  --r-btn:10px;
  --r-input:10px;
  --r-img:16px;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh-2:0 8px 24px -12px rgba(20,22,26,.12);
  --sh-hover:0 2px 4px rgba(20,22,26,.06),0 16px 34px -16px rgba(20,22,26,.2);
  --sidebar-w:264px;
  --gap:24px;
  --sect:96px;
  --font-cn:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Roboto Mono",Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-img);}
a{color:var(--copper-600);text-decoration:none;transition:color .15s var(--ease);}
a:hover{color:var(--copper-700);}
button{font-family:inherit;font-size:inherit;cursor:pointer;}
h1,h2,h3,h4,p,ul,ol,dl,figure{margin:0;}
ul,ol{padding-left:20px;}
:focus-visible{outline:2px solid var(--copper-600);outline-offset:2px;border-radius:4px;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

/* ============ Shell ============ */
.content{
  margin-left:var(--sidebar-w);
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
.main{flex:1;}
.main-inner{max-width:1240px;margin:0 auto;padding:0 32px;}

/* ============ Sidebar ============ */
.sidebar{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--sidebar-w);
  background:var(--surface);
  border-right:1px solid var(--line);
  display:flex;
  flex-direction:column;
  padding:22px 16px 18px;
  z-index:60;
}
.brand{display:flex;align-items:center;gap:10px;padding:0 8px 20px;border-bottom:1px solid var(--line);}
.brand-mark{
  width:38px;height:38px;flex:0 0 38px;
  border-radius:11px;
  background:linear-gradient(135deg,var(--copper-600),var(--amber));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-family:var(--font-mono);font-weight:700;font-size:15px;
  letter-spacing:.02em;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;overflow:hidden;}
.brand-text strong{font-size:16px;color:var(--ink-900);letter-spacing:.01em;}
.brand-text em{font-style:normal;font-size:11.5px;color:var(--ink-500);letter-spacing:.14em;}
.side-label{
  font-size:11.5px;letter-spacing:.14em;color:var(--ink-300);
  text-transform:uppercase;margin:20px 10px 8px;
}
.side-nav{display:flex;flex-direction:column;gap:2px;flex:1;overflow-y:auto;}
.side-link{
  position:relative;
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:0 12px;
  border-radius:var(--r-btn);
  color:var(--ink-700);
  font-size:14.5px;
  transition:background .15s var(--ease),color .15s var(--ease);
}
.side-link::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:2px;
  background:var(--copper-600);border-radius:2px;
  transform:scaleY(0);transform-origin:center;transition:transform .18s var(--ease);
}
.side-link:hover{background:var(--paper);color:var(--ink-900);}
.side-link:hover::before{transform:scaleY(1);}
.side-link.active{
  background:var(--copper-50);color:var(--copper-700);font-weight:600;
}
.side-link.active::before{transform:scaleY(1);}
.side-ico{
  width:24px;height:24px;flex:0 0 24px;
  border-radius:7px;background:var(--paper);
  display:flex;align-items:center;justify-content:center;
  font-size:12.5px;color:var(--ink-500);
  border:1px solid var(--line);
}
.side-link.active .side-ico{background:#fff;border-color:var(--copper-600);color:var(--copper-600);}
.side-txt{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.side-foot{border-top:1px solid var(--line);padding-top:16px;margin-top:16px;}
.side-ver{
  margin-top:10px;text-align:center;
  font-family:var(--font-mono);font-size:11.5px;color:var(--ink-300);
}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 20px;
  border-radius:var(--r-btn);
  border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;
  transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease),transform .12s var(--ease),box-shadow .15s var(--ease);
}
.btn:active{transform:translateY(1px);}
.btn .arw{transition:transform .18s var(--ease);font-family:var(--font-mono);}
.btn:hover .arw{transform:translateX(3px);}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:var(--sh-1);}
.btn-primary:hover{background:var(--copper-700);color:#fff;box-shadow:var(--sh-2);}
.btn-ghost{background:transparent;color:var(--ink-900);border-color:var(--ink-900);}
.btn-ghost:hover{background:var(--ink-900);color:var(--paper);}
.btn-light{background:#fff;color:var(--ink-900);border-color:rgba(255,255,255,.28);}
.btn-light:hover{background:var(--copper-50);color:var(--copper-700);border-color:var(--copper-600);}
.btn-outline-light{background:transparent;color:var(--paper);border-color:rgba(245,243,239,.42);}
.btn-outline-light:hover{background:rgba(245,243,239,.12);color:#fff;border-color:var(--paper);}
.btn-block{width:100%;}
.btn-sm{height:40px;padding:0 16px;font-size:14px;}

/* ============ Badges / tags ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 11px;border-radius:999px;
  font-size:12.5px;font-weight:600;line-height:1.7;
}
.badge-copper{background:var(--copper-50);color:var(--copper-700);}
.badge-green{background:var(--signal-50);color:var(--signal-600);}
.badge-gray{background:#EFEDE8;color:var(--ink-500);}
.dot{width:6px;height:6px;border-radius:50%;background:currentColor;}
.tag{
  display:inline-flex;align-items:center;
  padding:6px 14px;border-radius:999px;
  background:var(--surface);border:1px solid var(--line);
  font-size:13.5px;color:var(--ink-700);
  transition:border-color .15s var(--ease),color .15s var(--ease),background .15s var(--ease);
}
.tag:hover{border-color:var(--copper-600);color:var(--copper-700);background:var(--copper-50);}

/* ============ Topbar + drawer ============ */
.topbar{
  display:none;
  position:fixed;top:0;left:0;right:0;height:56px;z-index:70;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  align-items:center;gap:12px;padding:0 16px;
}
.hamburger{
  width:40px;height:40px;border:1px solid var(--line);background:#fff;border-radius:10px;
  display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;
}
.hamburger span{display:block;width:16px;height:1.6px;background:var(--ink-900);border-radius:2px;transition:transform .2s var(--ease),opacity .2s var(--ease);}
.topbar-brand{display:flex;flex-direction:column;line-height:1.15;flex:1;}
.topbar-brand strong{font-size:15px;color:var(--ink-900);}
.topbar-brand em{font-style:normal;font-size:11px;color:var(--ink-500);letter-spacing:.12em;}
.topbar-dl{
  width:40px;height:40px;border-radius:10px;background:var(--copper-600);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:17px;
}
.topbar-dl:hover{background:var(--copper-700);color:#fff;}
.drawer-mask{
  position:fixed;inset:0;background:rgba(20,22,26,.46);z-index:80;
  opacity:0;visibility:hidden;transition:opacity .22s var(--ease),visibility .22s var(--ease);
}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:88%;max-width:340px;z-index:90;
  background:var(--surface);border-left:1px solid var(--line);
  transform:translateX(100%);transition:transform .24s var(--ease);
  display:flex;flex-direction:column;padding:20px 16px;
}
body.drawer-open .drawer{transform:translateX(0);}
body.drawer-open .drawer-mask{opacity:1;visibility:visible;}
.drawer-close{
  align-self:flex-end;width:38px;height:38px;border-radius:10px;
  border:1px solid var(--line);background:#fff;color:var(--ink-700);font-size:18px;line-height:1;
}
.drawer-nav{display:flex;flex-direction:column;gap:2px;margin-top:16px;flex:1;overflow-y:auto;}
.drawer-nav a{
  display:flex;align-items:center;gap:10px;min-height:52px;padding:0 12px;
  border-radius:var(--r-btn);color:var(--ink-700);font-size:15px;border-bottom:1px solid var(--line);
}
.drawer-nav a.active{background:var(--copper-50);color:var(--copper-700);font-weight:600;border-bottom-color:transparent;}
.drawer-foot{border-top:1px solid var(--line);padding-top:16px;}

/* ============ Hero ============ */
.hero{padding:72px 0 8px;}
.hero-grid{
  display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center;
}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px;}
.hero h1{
  font-size:clamp(30px,4.2vw,56px);
  line-height:1.16;font-weight:700;letter-spacing:-.02em;
  color:var(--ink-900);
  margin-bottom:16px;
}
.hero-sub{font-size:17px;line-height:1.8;color:var(--ink-500);max-width:560px;margin-bottom:28px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;}
.hero-figure{position:relative;}
.hero-img{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-img);
  border:1px solid var(--line);box-shadow:var(--sh-2);
}
.hero-card{
  position:absolute;left:-20px;bottom:-22px;width:222px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:14px 16px;box-shadow:var(--sh-hover);
}
.hero-card dl{display:grid;grid-template-columns:auto 1fr;gap:6px 12px;font-size:12.5px;}
.hero-card dt{color:var(--ink-500);}
.hero-card dd{margin:0;text-align:right;font-family:var(--font-mono);color:var(--ink-900);font-weight:600;}

/* ============ Sections ============ */
.section{padding:var(--sect) 0 0;}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;
}
.section-head h2{
  font-size:clamp(24px,2.6vw,34px);font-weight:700;letter-spacing:-.01em;
  color:var(--ink-900);line-height:1.3;
}
.section-head p{color:var(--ink-500);font-size:15px;margin-top:8px;max-width:620px;}
.link-more{
  font-size:14.5px;font-weight:600;color:var(--copper-600);
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
}
.link-more:hover{color:var(--copper-700);}
.title-rule{position:relative;padding-bottom:14px;}
.title-rule::after{
  content:"";position:absolute;left:0;bottom:0;width:56px;height:2px;
  background:linear-gradient(90deg,var(--copper-600),var(--amber));border-radius:2px;
  transform:scaleX(1);transform-origin:left;
}

/* ============ Value strip ============ */
.value-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--sh-1);
}
.value-item{padding:28px 24px;border-right:1px solid var(--line);transition:background .18s var(--ease);}
.value-item:last-child{border-right:0;}
.value-item:hover{background:var(--copper-50);}
.value-num{
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.08em;
  color:var(--copper-600);display:block;margin-bottom:14px;
}
.value-item h3{font-size:17.5px;font-weight:600;color:var(--ink-900);margin-bottom:8px;}
.value-item p{font-size:14px;line-height:1.8;color:var(--ink-500);}

/* ============ Screenshot carousel ============ */
.carousel-wrap{position:relative;}
.shot-track{
  display:flex;gap:var(--gap);
  overflow-x:auto;scroll-snap-type:x mandatory;
  padding:4px 4px 18px;
  scrollbar-width:none;
}
.shot-track::-webkit-scrollbar{display:none;}
.shot{
  flex:0 0 82%;scroll-snap-align:start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--sh-1);transition:box-shadow .2s var(--ease),transform .2s var(--ease);
}
.shot:hover{box-shadow:var(--sh-hover);transform:translateY(-2px);}
.shot img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:0;}
.shot-body{padding:20px 22px;display:flex;gap:16px;align-items:flex-start;}
.shot-idx{
  font-family:var(--font-mono);font-size:12.5px;color:var(--copper-600);
  border:1px solid var(--copper-600);border-radius:999px;padding:2px 10px;flex:0 0 auto;
}
.shot-body h3{font-size:18px;font-weight:600;color:var(--ink-900);margin-bottom:6px;}
.shot-body p{font-size:14.5px;color:var(--ink-500);line-height:1.8;}
.carousel-ctrl{display:flex;gap:10px;margin-top:8px;}
.c-btn{
  width:44px;height:44px;border-radius:50%;background:transparent;
  border:1px solid var(--ink-700);color:var(--ink-900);
  display:flex;align-items:center;justify-content:center;font-size:16px;
  transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease);
}
.c-btn:hover{background:var(--ink-900);color:var(--paper);border-color:var(--ink-900);}
.c-dots{display:flex;gap:8px;align-items:center;margin-left:8px;}
.c-dot{width:8px;height:8px;border-radius:50%;background:var(--line);border:0;padding:0;transition:background .15s var(--ease),transform .15s var(--ease);}
.c-dot.active{background:var(--copper-600);transform:scale(1.25);}

/* ============ Spec table ============ */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-card);background:var(--surface);box-shadow:var(--sh-1);}
table.spec{width:100%;border-collapse:collapse;min-width:720px;}
table.spec th,table.spec td{
  padding:16px 20px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--line);
}
table.spec thead th{
  background:#FAF9F6;font-size:12.5px;letter-spacing:.1em;color:var(--ink-500);
  font-weight:600;text-transform:uppercase;
}
table.spec tbody tr:last-child td{border-bottom:0;}
table.spec tbody tr:hover{background:var(--copper-50);}
table.spec td:first-child{font-weight:600;color:var(--ink-900);}
table.spec td.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--ink-700);}
.spec-cards{display:none;}

/* ============ Reviews ============ */
.review-wall{columns:3;column-gap:var(--gap);}
.review{
  break-inside:avoid;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:22px;margin-bottom:var(--gap);
  box-shadow:var(--sh-1);transition:box-shadow .2s var(--ease),transform .2s var(--ease);
}
.review:hover{box-shadow:var(--sh-hover);transform:translateY(-2px);}
.review p{font-size:14.5px;line-height:1.9;color:var(--ink-700);margin-bottom:16px;}
.review-author{display:flex;align-items:center;gap:12px;}
.review-avatar{
  width:40px;height:40px;border-radius:11px;object-fit:cover;flex:0 0 40px;
}
.review-author strong{display:block;font-size:14.5px;color:var(--ink-900);}
.review-author span{font-size:12.5px;color:var(--ink-500);}

/* ============ News (CMS) ============ */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap);}
.news-card{
  display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--sh-1);color:inherit;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.news-card:hover{transform:translateY(-2px);box-shadow:var(--sh-hover);color:inherit;}
.news-thumb{position:relative;}
.news-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:0;}
.news-thumb .badge{position:absolute;left:14px;bottom:14px;background:rgba(251,238,231,.96);color:var(--copper-700);backdrop-filter:blur(4px);}
.news-body{padding:20px 22px 18px;display:flex;flex-direction:column;flex:1;}
.news-body h3{
  font-size:17.5px;font-weight:600;line-height:1.5;color:var(--ink-900);margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-card:hover h3{color:var(--copper-700);}
.news-body p{
  font-size:14px;color:var(--ink-500);line-height:1.8;flex:1;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{
  display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px;
  padding-top:14px;border-top:1px solid var(--line);
}
.news-meta time{font-family:var(--font-mono);font-size:12.5px;color:var(--ink-300);}
.news-meta .arw{font-family:var(--font-mono);color:var(--copper-600);transition:transform .18s var(--ease);}
.news-card:hover .news-meta .arw{transform:translateX(3px);}
.empty-state{
  border:1px dashed var(--line);border-radius:var(--r-card);
  background:rgba(255,255,255,.6);
  padding:48px 24px;text-align:left;
}
.empty-state p{color:var(--ink-500);margin-bottom:16px;font-size:15px;}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;background:transparent;border:0;padding:22px 44px 22px 0;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  font-size:16px;font-weight:600;color:var(--ink-900);text-align:left;
  position:relative;transition:color .15s var(--ease);
}
.faq-q:hover{color:var(--copper-700);}
.faq-icon{position:absolute;right:6px;width:16px;height:16px;flex:0 0 16px;}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--copper-600);border-radius:2px;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.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::after{transform:scaleY(0);opacity:0;}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s var(--ease);}
.faq-a p{padding:0 44px 24px 0;font-size:15px;line-height:1.9;color:var(--ink-500);}

/* ============ CTA band ============ */
.cta{
  margin-top:var(--sect);
  background:var(--ink-900);
  color:var(--paper);
  border-radius:var(--r-card);
  padding:56px 48px;
  display:grid;grid-template-columns:1.4fr 1fr;gap:44px;align-items:center;
  position:relative;overflow:hidden;
}
.cta::after{
  content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;
  border-radius:50%;background:rgba(192,86,43,.16);filter:blur(30px);pointer-events:none;
}
.cta h2{font-size:clamp(22px,2.4vw,30px);font-weight:700;color:#fff;line-height:1.35;margin-bottom:12px;}
.cta p{color:rgba(245,243,239,.72);font-size:15px;line-height:1.85;max-width:520px;}
.cta-right{display:flex;flex-direction:column;gap:16px;position:relative;z-index:1;}
.cta-buttons{display:flex;flex-wrap:wrap;gap:10px;}
.cta-note{font-family:var(--font-mono);font-size:12.5px;color:rgba(245,243,239,.6);}
.qr-row{display:flex;align-items:center;gap:14px;margin-top:6px;}
.qr-box{
  width:96px;height:96px;background:#fff;border-radius:12px;padding:8px;
  display:flex;align-items:center;justify-content:center;flex:0 0 96px;
}
.qr-box img{width:100%;height:100%;object-fit:cover;border-radius:8px;}
.qr-row span{font-size:13px;color:rgba(245,243,239,.72);line-height:1.7;}

/* ============ Footer ============ */
.site-footer{
  margin-top:var(--sect);
  background:var(--ink-900);color:rgba(245,243,239,.72);
  padding:64px 0 0;
}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.1fr;gap:40px;
  padding-bottom:48px;border-bottom:1px solid rgba(245,243,239,.14);
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{background:linear-gradient(135deg,var(--copper-600),var(--amber));}
.footer-brand strong{font-size:16px;color:#fff;display:block;line-height:1.3;}
.footer-brand em{font-style:normal;font-size:11.5px;color:rgba(245,243,239,.5);letter-spacing:.14em;}
.footer-col p{font-size:13.5px;line-height:1.9;margin-bottom:10px;}
.footer-col h3{
  font-size:12.5px;letter-spacing:.14em;color:rgba(245,243,239,.45);
  font-weight:600;margin-bottom:16px;text-transform:uppercase;
}
.footer-col ul{list-style:none;padding:0;display:flex;flex-direction:column;gap:10px;}
.footer-col a{color:rgba(245,243,239,.72);font-size:14px;}
.footer-col a:hover{color:var(--copper-600);text-decoration:underline;}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;
  padding:22px 0 28px;font-size:12.5px;color:rgba(245,243,239,.45);
}
.footer-bottom .mono{color:rgba(245,243,239,.55);}

/* ============ Reveal ============ */
.js .reveal{opacity:0;transform:translateY(12px);}
.js .reveal.is-visible{
  opacity:1;transform:none;
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}

/* ============ Responsive ============ */
@media (max-width:1439px){
  :root{--sidebar-w:248px;}
  .main-inner{padding:0 28px;}
}
@media (max-width:1199px){
  :root{--sidebar-w:76px;}
  .brand-text,.side-txt,.side-label,.side-ver{display:none;}
  .brand{justify-content:center;padding:0 0 18px;}
  .side-link{justify-content:center;padding:0;gap:0;}
  .sidebar{padding:20px 12px 16px;}
  .side-foot .btn span.dl-txt{display:none;}
  .hero-grid{grid-template-columns:1fr;gap:40px;}
  .hero-card{position:static;width:100%;margin-top:16px;}
  .review-wall{columns:2;}
  .news-grid{grid-template-columns:repeat(2,1fr);}
  .value-strip{grid-template-columns:repeat(2,1fr);}
  .value-item:nth-child(2){border-right:0;}
  .value-item:nth-child(1),.value-item:nth-child(2){border-bottom:1px solid var(--line);}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .shot{flex:0 0 88%;}
}
@media (max-width:1023px){
  .sidebar{display:none;}
  .topbar{display:flex;}
  .content{margin-left:0;padding-top:56px;}
  :root{--sect:72px;}
  .main-inner{padding:0 22px;}
  .cta{grid-template-columns:1fr;padding:40px 28px;}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px;}
}
@media (max-width:767px){
  :root{--sect:56px;}
  body{font-size:15.5px;}
  .main-inner{padding:0 16px;}
  .hero{padding:40px 0 0;}
  .hero-actions{gap:10px;}
  .hero-actions .btn{flex:1 1 100%;}
  .value-strip{grid-template-columns:1fr;}
  .value-item{border-right:0;border-bottom:1px solid var(--line);}
  .value-item:last-child{border-bottom:0;}
  .news-grid{grid-template-columns:1fr;}
  .review-wall{columns:1;}
  .shot{flex:0 0 92%;}
  .table-wrap{display:none;}
  .spec-cards{display:grid;gap:14px;}
  .spec-card{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
    padding:18px 18px 8px;box-shadow:var(--sh-1);
  }
  .spec-card h3{font-size:16px;color:var(--ink-900);margin-bottom:12px;}
  .spec-card dl{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;font-size:13.5px;margin:0 0 12px;}
  .spec-card dt{color:var(--ink-500);}
  .spec-card dd{margin:0;text-align:right;font-family:var(--font-mono);color:var(--ink-900);}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .cta-buttons{flex-direction:column;}
  .cta-buttons .btn{width:100%;}
  .faq-q{font-size:15px;padding-right:36px;}
  .faq-a p{padding-right:0;}
}
@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
  .js .reveal{opacity:1;transform:none;}
}

/* roulang page: article */
/* ============================================================
   设计变量
   ============================================================ */
:root{
  --copper-600:#C0562B;
  --copper-hover:#A6461F;
  --copper-light:#FBEEE7;
  --amber:#E0A03C;
  --signal-600:#1E8C6E;
  --signal-light:#E7F4F0;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --danger:#B3261E;
  --r-card:14px;
  --r-btn:10px;
  --r-img:16px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh-2:0 8px 24px -12px rgba(20,22,26,.12);
  --sh-3:0 16px 36px -16px rgba(20,22,26,.22);
  --ease:cubic-bezier(.2,.7,.2,1);
  --sb:264px;
  --mono:ui-monospace,"SFMono-Regular","Roboto Mono",Menlo,Consolas,monospace;
}

/* ============================================================
   基础 reset / base
   ============================================================ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-700);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);line-height:1.35;letter-spacing:-.01em}
h1{font-size:clamp(28px,3.6vw,44px);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(22px,2.4vw,30px);font-weight:700}
h3{font-size:20px;font-weight:600}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;border-radius:var(--r-img)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--copper-600);outline-offset:2px;border-radius:4px}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ============================================================
   应用外壳：左侧导航 + 主内容
   ============================================================ */
.app{min-height:100vh}
.sidebar{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--sb);
  background:var(--surface);
  border-right:1px solid var(--line);
  display:flex;
  flex-direction:column;
  padding:22px 16px 18px;
  z-index:60;
  transition:width .22s var(--ease);
}
.side-brand{display:flex;align-items:center;gap:11px;padding:4px 8px 20px;border-bottom:1px solid var(--line);margin-bottom:18px}
.brand-mark{
  flex:0 0 auto;display:grid;place-items:center;
  width:38px;height:38px;border-radius:10px;
  background:var(--copper-600);color:#fff;
  font-weight:700;font-size:14.5px;letter-spacing:.02em;
}
.side-brand-txt{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.side-brand-txt strong{font-size:16px;color:var(--ink-900);font-weight:700;white-space:nowrap}
.side-brand-txt em{font-style:normal;font-size:11.5px;color:var(--ink-300);letter-spacing:.14em;text-transform:uppercase;white-space:nowrap}
.side-nav{display:flex;flex-direction:column;gap:4px;flex:1;overflow-y:auto}
.side-link{
  position:relative;
  display:flex;align-items:center;gap:11px;
  height:44px;padding:0 12px;border-radius:10px;
  color:var(--ink-700);font-size:14.5px;font-weight:500;
  transition:background-color .15s var(--ease),color .15s var(--ease);
}
.side-link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:2px;height:0;border-radius:2px;background:var(--copper-600);
  transition:height .2s var(--ease);
}
.side-link:hover{background:#F1EEE8;color:var(--ink-900)}
.side-link:hover::before{height:18px}
.side-link.active{background:var(--copper-light);color:var(--copper-hover);font-weight:700;border-left:0}
.side-link.active::before{height:22px}
.side-ico{
  flex:0 0 auto;display:grid;place-items:center;
  width:26px;height:26px;border-radius:8px;
  background:#EFEDE8;color:var(--ink-500);
  font-size:12.5px;font-weight:700;
}
.side-link.active .side-ico{background:var(--copper-600);color:#fff}
.side-txt{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.side-foot{border-top:1px solid var(--line);padding-top:16px;margin-top:14px}
.side-foot .btn{width:100%;height:42px;font-size:14.5px}
.side-ver{margin-top:10px;font-size:12px;color:var(--ink-300);text-align:center;font-family:var(--mono)}

.content{margin-left:var(--sb);display:flex;flex-direction:column;min-height:100vh;transition:margin-left .22s var(--ease)}
.main-inner{width:100%;max-width:1240px;margin:0 auto;padding:0 32px}

/* ============================================================
   移动端顶栏与抽屉
   ============================================================ */
.mobile-bar{
  display:none;
  position:fixed;top:0;left:0;right:0;height:56px;z-index:65;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  align-items:center;gap:12px;padding:0 16px;
}
.burger{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:#F1EEE8;gap:4px}
.burger span{display:block;width:16px;height:1.8px;background:var(--ink-900);border-radius:2px}
.mobile-brand{display:flex;align-items:baseline;gap:6px;font-weight:700;color:var(--ink-900);font-size:15.5px}
.mobile-brand em{font-style:normal;font-size:11px;color:var(--ink-300);letter-spacing:.1em}
.mobile-dl{margin-left:auto;font-size:13.5px;font-weight:600;color:#fff;background:var(--copper-600);height:34px;display:inline-flex;align-items:center;padding:0 14px;border-radius:9px}
.drawer-mask{position:fixed;inset:0;background:rgba(20,22,26,.45);opacity:0;visibility:hidden;transition:opacity .24s var(--ease);z-index:70}
.drawer-mask.open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:88%;max-width:360px;
  background:var(--surface);z-index:80;display:flex;flex-direction:column;
  padding:20px;transform:translateX(103%);
  transition:transform .28s var(--ease);overflow-y:auto;
  box-shadow:-18px 0 48px -24px rgba(20,22,26,.4);
}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:11px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.drawer-head div{display:flex;flex-direction:column;line-height:1.25}
.drawer-head strong{font-size:15.5px;color:var(--ink-900)}
.drawer-head em{font-style:normal;font-size:11px;color:var(--ink-300);letter-spacing:.12em}
.drawer-close{margin-left:auto;width:36px;height:36px;border-radius:10px;background:#F1EEE8;font-size:20px;line-height:1;color:var(--ink-700);display:grid;place-items:center}
.drawer-nav{display:flex;flex-direction:column;padding:12px 0;flex:1}
.drawer-link{
  height:52px;display:flex;align-items:center;padding:0 14px;border-radius:10px;
  font-size:15.5px;color:var(--ink-700);transition:background-color .15s,color .15s;
}
.drawer-link:hover{background:#F1EEE8;color:var(--ink-900)}
.drawer-link.active{background:var(--copper-light);color:var(--copper-hover);font-weight:700}
.drawer-foot{border-top:1px solid var(--line);padding-top:16px}

/* ============================================================
   通用组件
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;white-space:nowrap;
  transition:background-color .15s var(--ease),color .15s var(--ease),
             border-color .15s var(--ease),transform .15s var(--ease),box-shadow .2s var(--ease);
}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:0 8px 18px -12px rgba(192,86,43,.95)}
.btn-primary:hover{background:var(--copper-hover);transform:translateY(-1px);box-shadow:0 12px 24px -14px rgba(192,86,43,1)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;color:var(--ink-900);border:1px solid var(--ink-900)}
.btn-ghost:hover{background:var(--ink-900);color:#fff}
.btn-outline-light{background:transparent;color:#F2EFE9;border:1px solid rgba(242,239,233,.42)}
.btn-outline-light:hover{background:rgba(242,239,233,.14);border-color:#F2EFE9}
.btn-block{width:100%}

.badge{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;
  border-radius:var(--r-pill);font-size:12.5px;font-weight:600;letter-spacing:.02em;
}
.badge-copper{background:var(--copper-light);color:var(--copper-hover)}
.badge-signal{background:var(--signal-light);color:var(--signal-600)}
.badge-grey{background:#EFEDE8;color:var(--ink-500)}

.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:26px}
.text-link{font-size:14.5px;color:var(--ink-500);transition:color .15s var(--ease)}
.text-link:hover{color:var(--copper-600);text-decoration:underline;text-underline-offset:4px}

/* ============================================================
   文章页头部
   ============================================================ */
.article-main{flex:1;padding:34px 0 0}
.breadcrumb{display:flex;align-items:center;gap:9px;flex-wrap:wrap;font-size:13.5px;color:var(--ink-500);margin-bottom:26px}
.breadcrumb a{transition:color .15s var(--ease)}
.breadcrumb a:hover{color:var(--copper-600);text-decoration:underline;text-underline-offset:4px}
.breadcrumb .sep{color:var(--ink-300)}
.breadcrumb .current{color:var(--ink-700);max-width:340px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.article-head{border-bottom:1px solid var(--line);padding-bottom:26px;margin-bottom:36px}
.article-head h1{margin:16px 0 0;max-width:920px}
.article-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:18px;font-size:13.5px;color:var(--ink-500)}
.article-meta .mono{color:var(--ink-700);font-size:13px}
.article-meta b{color:var(--ink-900);font-weight:700}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--line)}

/* ============================================================
   正文阅读区
   ============================================================ */
.article-grid{
  display:grid;
  grid-template-columns:minmax(0,768px) 240px;
  gap:56px;
  align-items:start;
}
.article-body{
  min-width:0;
  font-size:16.5px;
  line-height:1.92;
  color:var(--ink-700);
  overflow-wrap:break-word;
}
.article-body > *:first-child{margin-top:0}
.article-body p{margin:0 0 22px}
.article-body h2{
  position:relative;
  font-size:clamp(21px,2.1vw,27px);
  margin:46px 0 18px;padding-bottom:12px;
}
.article-body h2::after{
  content:"";position:absolute;left:0;bottom:0;width:56px;height:2px;
  border-radius:2px;background:var(--copper-600);
  transform-origin:left;animation:growLine .55s var(--ease) both;
}
@keyframes growLine{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.article-body h3{font-size:19.5px;margin:34px 0 14px}
.article-body h4{font-size:17px;margin:28px 0 12px;color:var(--ink-900)}
.article-body a{color:var(--copper-600);text-decoration:underline;text-underline-offset:4px}
.article-body a:hover{color:var(--copper-hover)}
.article-body ul{list-style:disc;padding-left:22px;margin:0 0 22px}
.article-body ol{list-style:decimal;padding-left:22px;margin:0 0 22px}
.article-body li{margin:9px 0}
.article-body li::marker{color:var(--copper-600)}
.article-body blockquote{
  margin:26px 0;padding:18px 22px;
  background:var(--copper-light);
  border-left:3px solid var(--copper-600);
  border-radius:0 12px 12px 0;
  color:var(--ink-700);font-size:15.5px;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--r-img);margin:26px auto;box-shadow:var(--sh-1)}
.article-body figure{margin:26px 0}
.article-body figcaption{text-align:center;font-size:13px;color:var(--ink-500);margin-top:10px}
.article-body hr{border:0;height:1px;background:var(--line);margin:40px 0}
.article-body code{
  font-family:var(--mono);font-size:14px;
  background:#F1EEE8;color:var(--copper-hover);
  padding:2px 6px;border-radius:6px;
}
.article-body pre{
  background:var(--ink-900);color:#EDEAE4;
  padding:20px 22px;border-radius:var(--r-card);
  overflow-x:auto;margin:26px 0;font-size:14px;line-height:1.75;
}
.article-body pre code{background:none;color:inherit;padding:0;font-size:14px}
.article-body table{
  width:100%;border-collapse:collapse;margin:26px 0;
  font-size:14.5px;display:block;overflow-x:auto;white-space:normal;
}
.article-body th,.article-body td{border:1px solid var(--line);padding:11px 14px;text-align:left}
.article-body th{background:var(--copper-light);color:var(--ink-900);font-weight:600}
.article-body tr:nth-child(even) td{background:#FBF9F6}

/* 侧栏 */
.article-aside{position:sticky;top:32px;display:grid;gap:18px}
.aside-card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:20px;box-shadow:var(--sh-1);
}
.aside-title{
  font-size:12px;font-weight:700;letter-spacing:.12em;
  color:var(--ink-300);text-transform:uppercase;margin-bottom:12px;
}
.aside-links{display:grid}
.aside-links a{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:11px 0;font-size:14.5px;color:var(--ink-700);
  border-bottom:1px solid var(--line);
  transition:color .15s var(--ease),padding-left .18s var(--ease);
}
.aside-links a:last-child{border-bottom:0}
.aside-links a:hover{color:var(--copper-600);padding-left:5px}
.aside-links a span:last-child{color:var(--ink-300);font-size:13px}
.aside-dl{display:grid;gap:10px}
.aside-dl .aside-sub{font-size:13px;color:var(--ink-500)}
.aside-dl .aside-sub b{font-family:var(--mono);color:var(--ink-900)}
.aside-dl .btn{height:42px;font-size:14.5px}
.aside-note{
  font-size:12.5px;color:var(--ink-300);
  display:flex;align-items:center;gap:7px;
}
.aside-note i{width:7px;height:7px;border-radius:50%;background:var(--signal-600);display:inline-block}

/* ============================================================
   相关推荐 / 返回入口
   ============================================================ */
.related{margin-top:72px;padding-top:8px}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.rcard{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);box-shadow:var(--sh-1);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.rcard:hover{transform:translateY(-2px);box-shadow:var(--sh-3);border-color:#D9D3C8}
.rcard-media{position:relative;aspect-ratio:16/9;overflow:hidden;background:#EDEAE4}
.rcard-media img{width:100%;height:100%;object-fit:cover;border-radius:0;transition:transform .45s var(--ease)}
.rcard:hover .rcard-media img{transform:scale(1.045)}
.rcard-media .badge{position:absolute;left:14px;bottom:14px;z-index:2;background:rgba(251,238,231,.95);color:var(--copper-hover)}
.rcard-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.rcard-body h3{font-size:17px;line-height:1.52;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rcard-body p{font-size:14px;line-height:1.72;color:var(--ink-500);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.rcard-foot{
  margin-top:auto;padding-top:13px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  font-size:12.5px;color:var(--ink-300);
}
.rcard-foot .mono{color:var(--ink-500)}
.back-cat{
  display:inline-flex;align-items:center;gap:8px;margin-top:30px;
  font-size:14.5px;font-weight:600;color:var(--copper-600);
  transition:gap .18s var(--ease),color .15s var(--ease);
}
.back-cat:hover{gap:13px;color:var(--copper-hover)}

/* ============================================================
   空状态
   ============================================================ */
.empty-state{
  border:1.5px dashed #D6D0C4;border-radius:var(--r-card);
  background:rgba(255,255,255,.6);
  padding:64px 32px;text-align:center;
  display:flex;flex-direction:column;align-items:center;gap:14px;
}
.empty-state .empty-title{font-size:20px;font-weight:700;color:var(--ink-900)}
.empty-state p{font-size:14.5px;color:var(--ink-500);max-width:520px}
.empty-state .btn{margin-top:8px}

/* ============================================================
   深色 CTA 带
   ============================================================ */
.cta-band{
  margin:72px 0 0;padding:44px;border-radius:18px;
  background:var(--ink-900);color:#EDEAE4;position:relative;overflow:hidden;
}
.cta-band::after{
  content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;border-radius:50%;
  background:rgba(192,86,43,.16);pointer-events:none;
}
.cta-inner{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:40px;align-items:center}
.cta-kicker{font-size:12.5px;letter-spacing:.12em;color:var(--amber);margin-bottom:12px}
.cta-copy h2{color:#FBFAF7;margin-bottom:10px}
.cta-copy p{font-size:14.5px;color:#B9B5AC;max-width:520px;line-height:1.8}
.cta-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:flex-end}
.cta-actions .btn{height:44px;padding:0 18px;font-size:14.5px}
.qr{
  width:96px;height:96px;border-radius:12px;background:#FBFAF7;color:var(--ink-900);
  display:grid;place-items:center;font-size:12px;font-weight:700;letter-spacing:.08em;
  text-align:center;line-height:1.5;flex:0 0 auto;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{background:var(--ink-900);color:#B9B5AC;margin-top:96px;padding:58px 0 0;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:44px;padding-bottom:46px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-brand strong{display:block;color:#FBFAF7;font-size:16px;font-weight:700;line-height:1.4}
.footer-brand em{display:block;font-style:normal;font-size:11px;color:#7B766D;letter-spacing:.14em;text-transform:uppercase}
.footer-col h3{font-size:13px;color:#FBFAF7;letter-spacing:.08em;margin-bottom:16px;font-weight:700}
.footer-col p{line-height:1.85;color:#9B978E;max-width:340px}
.footer-col p.mono{color:var(--amber);margin-top:12px;font-size:13px}
.footer-col ul{display:grid;gap:11px}
.footer-col li{color:#9B978E;line-height:1.7}
.footer-col a{color:#B9B5AC;transition:color .15s var(--ease)}
.footer-col a:hover{color:var(--copper-600);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.09);
  padding:20px 0 26px;display:flex;flex-wrap:wrap;gap:10px 26px;
  align-items:center;font-size:12.5px;color:#7B766D;
}
.footer-bottom .mono{color:#9B978E}

/* ============================================================
   滚动进入动效
   ============================================================ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============================================================
   响应式断点
   ============================================================ */
@media (min-width:1200px) and (max-width:1439px){
  :root{--sb:248px}
}
@media (min-width:1024px) and (max-width:1199px){
  :root{--sb:76px}
  .sidebar{padding:18px 10px}
  .side-brand{justify-content:center;padding-left:0;padding-right:0;padding-bottom:16px}
  .side-brand-txt{display:none}
  .side-link{justify-content:center;padding:0}
  .side-txt{display:none}
  .side-foot .btn{padding:0;font-size:0}
  .side-foot .btn::after{content:"下载";font-size:12.5px}
  .side-ver{font-size:10.5px}
  .article-grid{grid-template-columns:minmax(0,1fr) 220px;gap:36px}
}
@media (max-width:1023px){
  :root{--sb:0px}
  .sidebar{display:none}
  .mobile-bar{display:flex}
  .content{margin-left:0;padding-top:56px}
  .main-inner{padding:0 22px}
  .article-grid{grid-template-columns:minmax(0,1fr);gap:40px}
  .article-aside{position:static}
  .cta-inner{grid-template-columns:minmax(0,1fr);gap:28px}
  .cta-actions{justify-content:flex-start}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px}
}
@media (max-width:767px){
  body{font-size:15.5px}
  .main-inner{padding:0 16px}
  .article-main{padding:22px 0 0}
  .article-head h1{font-size:clamp(23px,6vw,30px)}
  .article-body{font-size:16px;line-height:1.9}
  .article-body h2{margin:36px 0 16px}
  .article-body pre{padding:16px;font-size:13px}
  .breadcrumb .current{max-width:180px}
  .card-grid{grid-template-columns:minmax(0,1fr)}
  .cta-band{margin-top:52px;padding:28px 22px;border-radius:14px}
  .cta-actions{flex-direction:column;align-items:stretch;width:100%}
  .cta-actions .btn{width:100%}
  .qr{width:100%;height:64px;flex-direction:row}
  .site-footer{margin-top:64px;padding-top:44px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:30px;padding-bottom:34px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .empty-state{padding:44px 20px}
}
@media (max-width:520px){
  .article-meta{gap:9px}
  .article-meta .dot{display:none}
  .section-head{align-items:flex-start;flex-direction:column;gap:10px}
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}

/* roulang page: category1 */
:root{
  --copper-600:#C0562B;
  --copper-700:#A6461F;
  --copper-100:#FBEEE7;
  --amber:#E0A03C;
  --signal-600:#1E8C6E;
  --signal-100:#E7F4EF;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --danger:#B3261E;
  --r-card:14px;
  --r-btn:10px;
  --r-img:16px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh-2:0 1px 2px rgba(20,22,26,.04),0 8px 24px -12px rgba(20,22,26,.12);
  --sh-3:0 2px 4px rgba(20,22,26,.05),0 16px 36px -14px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.7,.2,1);
  --side-w:264px;
  --sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Roboto Mono","Courier New",monospace;
}
@media (max-width:1439px){:root{--side-w:248px;}}
@media (max-width:1199px){:root{--side-w:76px;}}
@media (max-width:1023px){:root{--side-w:0px;}}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
h1,h2,h3{color:var(--ink-900);letter-spacing:-.02em;line-height:1.3;}
p{color:var(--ink-500);}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--copper-600);outline-offset:2px;border-radius:4px;}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;}

/* ---------- 侧栏 ---------- */
.side{
  position:fixed;top:0;left:0;bottom:0;width:var(--side-w);
  background:var(--surface);border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  padding:22px 16px 18px;z-index:40;
}
.side-brand{display:flex;align-items:center;gap:11px;padding:6px 8px 22px;}
.brand-mark{
  width:38px;height:38px;flex:0 0 38px;border-radius:11px;
  background:linear-gradient(135deg,var(--copper-600),var(--amber));
  color:#fff;font-family:var(--mono);font-weight:700;font-size:15px;
  display:flex;align-items:center;justify-content:center;letter-spacing:.04em;
}
.brand-text strong{display:block;font-size:15.5px;font-weight:700;color:var(--ink-900);letter-spacing:-.01em;line-height:1.35;}
.brand-text em{display:block;font-style:normal;font-size:10.5px;letter-spacing:.16em;color:var(--ink-300);font-family:var(--mono);}
.side-cap{font-size:12px;letter-spacing:.12em;color:var(--ink-300);padding:0 10px 10px;font-weight:600;}
.side-nav{display:flex;flex-direction:column;gap:2px;overflow-y:auto;flex:1 1 auto;}
.side-link{
  position:relative;display:flex;align-items:center;gap:11px;
  min-height:44px;padding:0 12px;border-radius:10px;
  font-size:14.5px;font-weight:500;color:var(--ink-700);
  transition:background .15s var(--ease),color .15s var(--ease);
}
.side-link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:2px;height:20px;border-radius:2px;background:var(--copper-600);
  transition:transform .18s var(--ease);
}
.side-link:hover{background:#FAF8F4;color:var(--ink-900);}
.side-link:hover::before{transform:translateY(-50%) scaleY(1);}
.side-link.active{background:var(--copper-100);color:var(--copper-700);font-weight:700;}
.side-link.active::before{transform:translateY(-50%) scaleY(1);}
.side-ico{
  width:24px;height:24px;flex:0 0 24px;border-radius:7px;
  background:var(--paper);color:var(--ink-500);
  font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;
}
.side-link.active .side-ico{background:#fff;color:var(--copper-600);}
.side-foot{margin-top:14px;padding-top:16px;border-top:1px solid var(--line);}
.side-foot .btn{width:100%;justify-content:center;height:42px;font-size:14px;}
.side-ver{margin-top:10px;text-align:center;font-size:11.5px;color:var(--ink-300);font-family:var(--mono);}

/* ---------- 移动端顶栏 ---------- */
.topbar{
  display:none;position:sticky;top:0;z-index:50;height:56px;
  background:rgba(245,243,239,.94);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  align-items:center;justify-content:space-between;padding:0 16px;
}
.topbar .tb-brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink-900);font-size:15px;}
.topbar .brand-mark{width:30px;height:30px;flex:0 0 30px;border-radius:9px;font-size:12px;}
.burger{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--surface);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;}
.burger span{display:block;width:16px;height:1.6px;background:var(--ink-900);border-radius:2px;}

/* ---------- 抽屉 ---------- */
.scrim{position:fixed;inset:0;background:rgba(20,22,26,.44);opacity:0;visibility:hidden;transition:opacity .22s var(--ease),visibility .22s;z-index:60;}
.scrim.show{opacity:1;visibility:visible;}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:88%;max-width:392px;
  background:var(--surface);z-index:70;
  transform:translateX(102%);transition:transform .28s var(--ease);
  display:flex;flex-direction:column;padding:20px 18px;
  box-shadow:-20px 0 40px -20px rgba(20,22,26,.3);
}
.drawer.show{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:16px;border-bottom:1px solid var(--line);}
.drawer-head strong{font-size:15px;color:var(--ink-900);}
.drawer-close{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);font-size:16px;line-height:1;color:var(--ink-500);}
.drawer-nav{display:flex;flex-direction:column;gap:4px;padding:16px 0;overflow-y:auto;flex:1 1 auto;}
.drawer-nav .side-link{min-height:52px;font-size:15px;}
.drawer-foot{padding-top:16px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px;}

/* ---------- 主区 ---------- */
.main{margin-left:var(--side-w);}
.main-inner{max-width:1240px;margin:0 auto;padding:0 36px;}

/* ---------- 面包屑 ---------- */
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-300);padding:26px 0 0;}
.crumb a{color:var(--ink-500);transition:color .15s;}
.crumb a:hover{color:var(--copper-600);}
.crumb .sep{color:var(--ink-300);}
.crumb .cur{color:var(--ink-900);font-weight:600;}

/* ---------- 页头 ---------- */
.page-head{
  display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center;
  padding:36px 0 64px;
}
.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;}
.badge{display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;border-radius:var(--r-pill);font-size:12.5px;font-weight:600;}
.badge-copper{background:var(--copper-100);color:var(--copper-700);}
.badge-green{background:var(--signal-100);color:var(--signal-600);}
.badge-gray{background:#EFEDE8;color:var(--ink-500);}
.dot{width:6px;height:6px;border-radius:50%;background:currentColor;display:inline-block;}
.page-head h1{font-size:clamp(30px,3.4vw,46px);font-weight:700;margin-bottom:16px;}
.page-head h1 .hl{
  background:linear-gradient(180deg,transparent 62%,rgba(192,86,43,.22) 62%,rgba(224,160,60,.22) 100%);
  padding:0 3px;
}
.lead{font-size:16.5px;line-height:1.9;color:var(--ink-500);max-width:620px;}
.head-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px;}
.head-figure{position:relative;border-radius:var(--r-img);overflow:hidden;border:1px solid var(--line);background:var(--surface);box-shadow:var(--sh-2);}
.head-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.head-figure figcaption{
  position:absolute;left:14px;bottom:14px;right:14px;
  background:rgba(20,22,26,.78);color:#F5F3EF;border-radius:10px;
  padding:10px 14px;font-size:12.5px;line-height:1.6;
}
.head-figure figcaption b{display:block;font-family:var(--mono);font-size:13.5px;letter-spacing:.02em;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:0;
  transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease),transform .15s var(--ease),box-shadow .15s var(--ease);
  white-space:nowrap;
}
.btn .arw{transition:transform .18s var(--ease);}
.btn:hover .arw{transform:translateX(3px);}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:0 6px 16px -8px rgba(192,86,43,.7);}
.btn-primary:hover{background:var(--copper-700);}
.btn-ghost{border:1px solid var(--ink-900);color:var(--ink-900);background:transparent;}
.btn-ghost:hover{background:var(--ink-900);color:#fff;}
.btn-sm{height:38px;padding:0 16px;font-size:13.5px;border-radius:9px;}
.btn-block{width:100%;}
.btn-light{background:#F5F3EF;color:var(--ink-900);}
.btn-light:hover{background:#fff;}
.btn-outline-light{border:1px solid rgba(245,243,239,.42);color:#F5F3EF;}
.btn-outline-light:hover{background:rgba(245,243,239,.12);}

/* ---------- 板块 ---------- */
.section{padding:56px 0;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:34px;flex-wrap:wrap;}
.sec-num{
  font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--copper-600);display:block;margin-bottom:10px;
}
.sec-head h2{font-size:clamp(23px,2.4vw,31px);font-weight:700;}
.sec-head p{font-size:14.5px;color:var(--ink-500);margin-top:10px;max-width:640px;}
.sec-link{font-size:14px;font-weight:600;color:var(--copper-600);border-bottom:1px solid transparent;transition:border-color .15s;}
.sec-link:hover{border-bottom-color:var(--copper-600);}

/* ---------- 平台矩阵卡 ---------- */
.plat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.plat-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;display:flex;flex-direction:column;gap:14px;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.plat-card:hover{transform:translateY(-2px);box-shadow:var(--sh-3);border-color:#D8D2C6;}
.plat-top{display:flex;align-items:center;justify-content:space-between;gap:10px;}
.plat-name{font-size:17px;font-weight:700;color:var(--ink-900);}
.plat-os{font-size:12.5px;color:var(--ink-300);font-family:var(--mono);}
.plat-meta{display:flex;flex-direction:column;gap:8px;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.plat-meta div{display:flex;align-items:baseline;justify-content:space-between;gap:10px;font-size:13px;color:var(--ink-500);}
.plat-meta b{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:13.5px;color:var(--ink-900);font-weight:600;}
.plat-note{font-size:12.5px;color:var(--ink-300);line-height:1.7;}

/* ---------- 时间轴 ---------- */
.tl-wrap{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start;}
.timeline{border-left:1px solid var(--line);margin-left:6px;}
.tl-item{position:relative;padding:0 0 30px 26px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-6px;top:9px;width:11px;height:11px;border-radius:50%;
  background:var(--copper-600);box-shadow:0 0 0 4px var(--paper);
}
.tl-item.old::before{background:var(--ink-300);}
.tl-date{font-family:var(--mono);font-size:12.5px;color:var(--ink-300);letter-spacing:.02em;}
.tl-ver{display:inline-flex;align-items:center;gap:8px;font-size:15.5px;font-weight:700;color:var(--ink-900);margin:4px 0 6px;font-family:var(--mono);}
.tl-item p{font-size:14px;line-height:1.82;color:var(--ink-500);max-width:520px;}
.tl-tag{font-size:11.5px;font-weight:600;padding:2px 9px;border-radius:var(--r-pill);background:var(--signal-100);color:var(--signal-600);font-family:var(--sans);}
.tl-tag.gray{background:#EFEDE8;color:var(--ink-500);}

/* ---------- 校验说明 ---------- */
.hash-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;box-shadow:var(--sh-1);
}
.hash-panel h3{font-size:17px;font-weight:700;margin-bottom:8px;}
.hash-panel > p{font-size:14px;margin-bottom:18px;}
.hash-row{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:12px 0;border-top:1px solid var(--line);flex-wrap:wrap;
}
.hash-row span{font-size:13px;color:var(--ink-500);min-width:96px;}
.hash-row code{
  font-family:var(--mono);font-size:12.5px;color:var(--ink-900);
  background:var(--paper);border:1px solid var(--line);border-radius:8px;
  padding:6px 10px;word-break:break-all;flex:1 1 240px;
}

/* ---------- 表格 / 系统要求 ---------- */
.table-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-1);}
.table-wrap table{min-width:760px;}
.table-wrap thead th{
  background:#FAF8F4;font-size:13px;font-weight:700;color:var(--ink-900);
  text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);letter-spacing:.02em;
}
.table-wrap tbody td{
  font-size:13.8px;color:var(--ink-500);padding:14px 18px;border-bottom:1px solid var(--line);
  vertical-align:top;
}
.table-wrap tbody tr:last-child td{border-bottom:0;}
.table-wrap tbody tr:hover{background:#FCFBF8;}
.table-wrap tbody td:first-child{font-weight:600;color:var(--ink-900);white-space:nowrap;}
.table-wrap tbody td b{font-family:var(--mono);color:var(--ink-900);font-weight:600;}
.table-scroll{overflow-x:auto;}
.req-cards{display:none;flex-direction:column;gap:14px;}
.req-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:18px;}
.req-card h4{font-size:14.5px;color:var(--ink-900);margin-bottom:12px;}
.req-card dl{margin:0;display:flex;flex-direction:column;gap:9px;}
.req-card dt{font-size:12px;color:var(--ink-300);}
.req-card dd{margin:0;font-size:13.5px;color:var(--ink-700);}

/* ---------- 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:20px;
  padding:20px 4px;text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);
  transition:color .15s var(--ease);
}
.faq-q:hover{color:var(--copper-600);}
.faq-ico{position:relative;width:16px;height:16px;flex:0 0 16px;}
.faq-ico::before,.faq-ico::after{content:"";position:absolute;background:var(--ink-500);border-radius:2px;transition:transform .22s var(--ease),opacity .22s;}
.faq-ico::before{left:0;top:7px;width:16px;height:1.6px;}
.faq-ico::after{top:0;left:7px;width:1.6px;height:16px;}
.faq-item.open .faq-ico::after{transform:scaleY(0);opacity:0;}
.faq-item.open .faq-q{color:var(--copper-700);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease);}
.faq-a p{font-size:15px;line-height:1.9;padding:0 4px 22px;max-width:840px;color:var(--ink-500);}

/* ---------- CTA ---------- */
.cta-band{
  background:var(--ink-900);border-radius:20px;padding:40px 42px;
  display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center;
  margin:64px 0 0;
}
.cta-band h2{color:#F5F3EF;font-size:clamp(22px,2.2vw,30px);margin-bottom:12px;}
.cta-band p{color:#A9AEB8;font-size:14.5px;max-width:520px;}
.cta-right{display:flex;flex-direction:column;gap:16px;}
.cta-btns{display:flex;flex-wrap:wrap;gap:10px;}
.cta-qr{display:flex;align-items:center;gap:14px;padding-top:16px;border-top:1px solid rgba(245,243,239,.14);}
.qr-box{width:88px;height:88px;flex:0 0 88px;background:#F5F3EF;border-radius:12px;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:11px;color:var(--ink-500);text-align:center;line-height:1.4;}
.cta-qr span{font-size:12.5px;color:#A9AEB8;line-height:1.7;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink-900);margin-top:88px;padding:60px 0 26px;}
.site-footer .main-inner{max-width:1240px;margin:0 auto;padding:0 36px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.15fr;gap:36px;padding-bottom:36px;border-bottom:1px solid rgba(245,243,239,.12);}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.footer-brand .brand-mark{width:36px;height:36px;flex:0 0 36px;}
.footer-brand strong{display:block;color:#F5F3EF;font-size:15.5px;}
.footer-brand em{display:block;font-style:normal;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:#7C818C;}
.footer-col p{color:#A9AEB8;font-size:13.5px;line-height:1.85;max-width:340px;}
.footer-col .mono{color:#7C818C;margin-top:12px;font-size:12.5px;}
.footer-col h3{color:#F5F3EF;font-size:14px;margin-bottom:16px;letter-spacing:.02em;}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col li{font-size:13.5px;color:#A9AEB8;}
.footer-col li a{color:#A9AEB8;border-bottom:1px solid transparent;transition:color .15s,border-color .15s;}
.footer-col li a:hover{color:var(--amber);border-bottom-color:var(--amber);}
.footer-bottom{display:flex;flex-wrap:wrap;gap:14px 26px;justify-content:space-between;padding-top:22px;font-size:12.5px;color:#7C818C;}

/* ---------- 滚动进入 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease);}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1199px) and (min-width:1024px){
  .side{padding:20px 12px 16px;align-items:center;}
  .side-brand{justify-content:center;padding:6px 0 20px;}
  .side-brand .brand-text{display:none;}
  .side-cap{display:none;}
  .side-nav{width:100%;align-items:center;}
  .side-link{justify-content:center;padding:0;width:48px;}
  .side-txt{
    position:absolute;left:calc(100% + 12px);top:50%;transform:translateY(-50%);
    background:var(--ink-900);color:#F5F3EF;font-size:13px;font-weight:500;
    padding:6px 12px;border-radius:8px;white-space:nowrap;opacity:0;visibility:hidden;
    transition:opacity .15s var(--ease),visibility .15s;z-index:60;pointer-events:none;
  }
  .side-link:hover .side-txt{opacity:1;visibility:visible;}
  .side-foot .btn{padding:0;width:48px;font-size:0;}
  .side-foot .btn::after{content:"下";font-size:14px;}
  .side-ver{display:none;}
}
@media (max-width:1023px){
  .side{transform:translateX(-102%);transition:transform .28s var(--ease);}
  .topbar{display:flex;}
  .main{margin-left:0;}
  .main-inner{padding:0 22px;}
  .site-footer .main-inner{padding:0 22px;}
  .page-head{grid-template-columns:1fr;gap:28px;padding:26px 0 44px;}
  .head-figure{order:-1;}
  .plat-grid{grid-template-columns:repeat(2,1fr);}
  .tl-wrap{grid-template-columns:1fr;gap:34px;}
  .cta-band{grid-template-columns:1fr;gap:26px;padding:32px 26px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
  .section{padding:46px 0;}
}
@media (max-width:767px){
  body{font-size:15.5px;}
  .main-inner{padding:0 16px;}
  .site-footer .main-inner{padding:0 16px;}
  .plat-grid{grid-template-columns:1fr;gap:16px;}
  .table-scroll{display:none;}
  .req-cards{display:flex;}
  .head-actions .btn{width:100%;}
  .cta-btns .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px;}
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px;}
  .site-footer{margin-top:64px;padding:44px 0 22px;}
  .timeline{margin-left:2px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;}
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category2 */
:root{
  --copper-600:#C0562B;
  --copper-700:#A6461F;
  --copper-50:#FBEEE7;
  --signal-600:#1E8C6E;
  --signal-50:#E8F5F0;
  --amber:#E0A03C;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --line-soft:#EFEBE3;
  --danger:#B3261E;
  --radius-card:14px;
  --radius-btn:10px;
  --radius-img:16px;
  --shadow-sm:0 1px 2px rgba(20,22,26,.04);
  --shadow-md:0 1px 2px rgba(20,22,26,.04),0 8px 24px -12px rgba(20,22,26,.12);
  --shadow-lg:0 2px 4px rgba(20,22,26,.05),0 18px 40px -18px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.7,.2,1);
  --mono:ui-monospace,"Roboto Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --side-w:264px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,p,ul,ol,figure,dl,dd,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input,textarea,select{font:inherit;color:inherit;}
:focus-visible{outline:2px solid var(--copper-600);outline-offset:2px;border-radius:6px;}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;}

/* ---------- App shell ---------- */
.app-shell{display:block;}
.sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--side-w);
  background:var(--surface);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  padding:20px 14px 16px;
  z-index:60;
}
.side-top{padding:0 6px 18px;border-bottom:1px solid var(--line-soft);}
.brand{display:flex;align-items:center;gap:11px;}
.brand-mark{
  width:38px;height:38px;flex:0 0 auto;border-radius:11px;
  background:linear-gradient(135deg,var(--copper-600),var(--amber));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:14px;font-weight:700;letter-spacing:.02em;
  box-shadow:0 6px 16px -8px rgba(192,86,43,.7);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0;}
.brand-text strong{font-size:15.5px;color:var(--ink-900);font-weight:700;letter-spacing:.01em;}
.brand-text em{font-style:normal;font-size:11.5px;color:var(--ink-300);letter-spacing:.18em;}
.side-nav{display:flex;flex-direction:column;gap:4px;padding:16px 0;flex:1 1 auto;overflow-y:auto;}
.side-link{
  position:relative;display:flex;align-items:center;gap:12px;
  min-height:44px;padding:0 12px;border-radius:10px;
  font-size:14.5px;color:var(--ink-700);
  transition:background 150ms var(--ease),color 150ms var(--ease);
}
.side-link .side-ico{
  width:26px;height:26px;flex:0 0 auto;border-radius:8px;
  background:var(--paper);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-size:12.5px;color:var(--ink-500);
  transition:all 150ms var(--ease);
}
.side-link .side-txt{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.side-link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:2px;height:22px;border-radius:2px;background:var(--copper-600);
  transition:transform 180ms var(--ease);
}
.side-link:hover{background:var(--paper);color:var(--ink-900);}
.side-link:hover::before{transform:translateY(-50%) scaleY(1);}
.side-link:hover .side-ico{border-color:var(--copper-600);color:var(--copper-700);}
.side-link.active{background:var(--copper-50);color:var(--copper-700);font-weight:600;}
.side-link.active::before{transform:translateY(-50%) scaleY(1);}
.side-link.active .side-ico{background:#fff;border-color:var(--copper-600);color:var(--copper-700);}
.side-bottom{border-top:1px solid var(--line-soft);padding-top:14px;display:flex;flex-direction:column;gap:10px;align-items:flex-start;}
.side-ver{font-size:12px;color:var(--ink-300);padding-left:4px;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1;
  border:1px solid transparent;
  transition:background 150ms var(--ease),color 150ms var(--ease),border-color 150ms var(--ease),transform 220ms var(--ease),box-shadow 220ms var(--ease);
}
.btn .arrow{display:inline-block;transition:transform 220ms var(--ease);}
.btn:hover .arrow{transform:translateX(3px);}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:var(--shadow-sm);}
.btn-primary:hover{background:var(--copper-700);box-shadow:var(--shadow-md);transform:translateY(-1px);}
.btn-primary:active{transform:translateY(1px);box-shadow:var(--shadow-sm);}
.btn-ghost{border-color:var(--ink-300);color:var(--ink-900);background:transparent;}
.btn-ghost:hover{border-color:var(--ink-900);background:var(--surface);transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(1px);}
.btn-sm{height:38px;padding:0 16px;font-size:13.5px;border-radius:9px;}
.btn-light{background:#fff;color:var(--ink-900);}
.btn-light:hover{background:#fff;color:var(--copper-700);box-shadow:var(--shadow-md);transform:translateY(-1px);}
.btn-outline-light{border-color:rgba(245,243,239,.34);color:#F5F3EF;background:transparent;}
.btn-outline-light:hover{border-color:#F5F3EF;background:rgba(255,255,255,.07);transform:translateY(-1px);}

/* ---------- Layout ---------- */
.main-wrap{margin-left:var(--side-w);min-height:100vh;display:flex;flex-direction:column;}
.main{flex:1 0 auto;}
.main-inner{width:100%;max-width:1240px;margin:0 auto;padding:0 40px;}
.section{padding:96px 0;border-top:1px solid var(--line);}
.section:first-of-type{border-top:0;}

/* ---------- Mobile bar & drawer ---------- */
.mobile-bar{
  display:none;position:fixed;top:0;left:0;right:0;height:56px;z-index:70;
  background:var(--surface);border-bottom:1px solid var(--line);
  align-items:center;gap:12px;padding:0 16px;
}
.hamburger{
  width:38px;height:38px;border-radius:10px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--ink-900);
}
.hamburger:hover{background:var(--paper);}
.mobile-brand{font-size:15px;font-weight:700;color:var(--ink-900);flex:1 1 auto;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.mobile-dl{
  width:38px;height:38px;border-radius:10px;background:var(--copper-600);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:16px;
}
.drawer-mask{
  position:fixed;inset:0;background:rgba(20,22,26,.46);z-index:85;
  opacity:0;pointer-events:none;transition:opacity 220ms var(--ease);
}
.drawer-mask.open{opacity:1;pointer-events:auto;}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:88%;max-width:360px;z-index:90;
  background:var(--surface);box-shadow:var(--shadow-lg);
  transform:translateX(100%);transition:transform 220ms var(--ease);
  display:flex;flex-direction:column;padding:18px 16px;
}
.drawer.open{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:4px 4px 16px;border-bottom:1px solid var(--line-soft);}
.drawer-head strong{font-size:15px;color:var(--ink-900);}
.drawer-close{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);font-size:20px;line-height:1;color:var(--ink-500);}
.drawer-close:hover{background:var(--paper);}
.drawer-nav{display:flex;flex-direction:column;gap:4px;padding:14px 0;flex:1 1 auto;overflow-y:auto;}
.drawer-nav a{
  display:flex;align-items:center;gap:12px;min-height:52px;padding:0 14px;border-radius:10px;
  font-size:15px;color:var(--ink-700);transition:background 150ms var(--ease),color 150ms var(--ease);
}
.drawer-nav a:hover{background:var(--paper);color:var(--ink-900);}
.drawer-nav a.active{background:var(--copper-50);color:var(--copper-700);font-weight:600;}
.drawer-nav .side-ico{
  width:26px;height:26px;border-radius:8px;background:var(--paper);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:12.5px;color:var(--ink-500);flex:0 0 auto;
}
.drawer-foot{border-top:1px solid var(--line-soft);padding-top:14px;}

/* ---------- Breadcrumb ---------- */
.crumbs{padding:26px 0 0;font-size:13.5px;color:var(--ink-500);display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.crumbs a{color:var(--ink-500);transition:color 150ms var(--ease);}
.crumbs a:hover{color:var(--copper-700);}
.crumbs .sep{color:var(--ink-300);}
.crumbs .current{color:var(--ink-900);font-weight:600;}

/* ---------- Page hero ---------- */
.page-hero{padding:28px 0 80px;}
.hero-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:56px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:999px;background:var(--copper-50);
  color:var(--copper-700);font-size:12.5px;font-weight:600;letter-spacing:.1em;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--copper-600);}
.page-hero h1{
  font-size:clamp(30px,4.2vw,52px);line-height:1.16;font-weight:700;
  letter-spacing:-.02em;color:var(--ink-900);margin:20px 0 0;
}
.lede{font-size:17px;line-height:1.8;color:var(--ink-500);margin-top:18px;max-width:580px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;}
.hero-note{margin-top:20px;font-size:13.5px;color:var(--ink-300);}
.hero-media{position:relative;}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--radius-img);box-shadow:var(--shadow-lg);
}
.hero-float{
  position:absolute;left:-26px;bottom:26px;width:236px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:16px 18px;box-shadow:var(--shadow-md);
}
.hero-float .hf-title{font-size:12px;letter-spacing:.12em;color:var(--ink-300);font-weight:600;}
.hero-float dl{margin-top:10px;display:grid;gap:8px;}
.hero-float dt{font-size:12.5px;color:var(--ink-500);}
.hero-float dd{margin:0;font-family:var(--mono);font-size:14px;color:var(--ink-900);font-weight:600;}

/* ---------- Section head ---------- */
.section-head{max-width:780px;margin-bottom:44px;}
.section-head .num{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12.5px;font-weight:600;
  letter-spacing:.16em;color:var(--copper-600);
}
.section-head .num::after{
  content:"";display:block;width:56px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--copper-600),var(--amber));
}
.section-head h2{
  font-size:clamp(24px,2.6vw,34px);line-height:1.3;font-weight:700;
  letter-spacing:-.01em;color:var(--ink-900);margin:14px 0 12px;
}
.section-head p{font-size:15.5px;color:var(--ink-500);}

/* ---------- Feature bands ---------- */
.band{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:52px;align-items:center;padding:36px 0;}
.band + .band{border-top:1px dashed var(--line);margin-top:12px;padding-top:52px;}
.band.reverse .band-media{order:2;}
.band-media img{
  width:100%;aspect-ratio:16/11;object-fit:cover;
  border-radius:var(--radius-img);box-shadow:var(--shadow-md);
  transition:transform 400ms var(--ease),box-shadow 400ms var(--ease);
}
.band-media img:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  background:var(--copper-50);color:var(--copper-700);
  font-size:12.5px;font-weight:600;letter-spacing:.04em;
}
.badge-green{background:var(--signal-50);color:var(--signal-600);}
.badge-grey{background:#F1EFEA;color:var(--ink-500);}
.band-body h3{font-size:20px;line-height:1.45;font-weight:600;color:var(--ink-900);margin:14px 0 12px;}
.band-body p{font-size:15px;color:var(--ink-500);line-height:1.9;}
.tick-list{margin-top:18px;display:grid;gap:10px;}
.tick-list li{position:relative;padding-left:24px;font-size:14.5px;color:var(--ink-700);line-height:1.7;}
.tick-list li::before{
  content:"";position:absolute;left:0;top:10px;width:14px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--copper-600),var(--amber));
}

/* ---------- Spec table ---------- */
.spec-wrap{
  overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-card);
  background:var(--surface);box-shadow:var(--shadow-sm);
}
table{width:100%;border-collapse:collapse;min-width:700px;}
thead th{
  background:#FAF8F5;text-align:left;padding:14px 22px;
  font-size:12.5px;font-weight:600;letter-spacing:.08em;color:var(--ink-500);
  border-bottom:1px solid var(--line);white-space:nowrap;
}
tbody td{
  padding:16px 22px;border-bottom:1px solid var(--line-soft);
  font-size:14.5px;color:var(--ink-700);vertical-align:top;line-height:1.7;
}
tbody tr:last-child td{border-bottom:0;}
tbody tr{transition:background 150ms var(--ease);}
tbody tr:hover{background:#FBFAF6;}
td .cell-key{font-weight:600;color:var(--ink-900);}
.table-foot{margin-top:14px;font-size:13px;color:var(--ink-300);}

/* ---------- Metric bar ---------- */
.metric-bar{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--radius-card);overflow:hidden;margin-top:40px;
}
.metric{background:var(--surface);padding:26px 24px;}
.metric-num{
  display:block;font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3vw,36px);font-weight:700;color:var(--ink-900);letter-spacing:-.02em;
}
.metric-num em{font-style:normal;font-size:15px;color:var(--copper-600);margin-left:4px;font-weight:600;}
.metric-label{display:block;margin-top:8px;font-size:13.5px;color:var(--ink-500);}

/* ---------- Chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px;}
.chip{
  padding:8px 16px;border-radius:999px;border:1px solid var(--line);
  background:var(--surface);font-size:13.5px;color:var(--ink-700);
  transition:border-color 150ms var(--ease),color 150ms var(--ease),background 150ms var(--ease),transform 150ms var(--ease);
}
.chip:hover{border-color:var(--copper-600);color:var(--copper-700);background:var(--copper-50);transform:translateY(-2px);}

/* ---------- Flow ---------- */
.flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px;}
.flow-step{
  position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-card);padding:26px 24px;
  box-shadow:var(--shadow-sm);
  transition:transform 220ms var(--ease),box-shadow 220ms var(--ease),border-color 220ms var(--ease);
}
.flow-step:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:#D8D2C6;}
.flow-step .step-no{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:10px;
  background:linear-gradient(135deg,var(--copper-600),var(--amber));
  color:#fff;font-family:var(--mono);font-size:13px;font-weight:700;
}
.flow-step h3{font-size:17px;font-weight:600;color:var(--ink-900);margin:16px 0 8px;}
.flow-step p{font-size:14px;color:var(--ink-500);line-height:1.75;}
.flow-step .step-meta{
  display:block;margin-top:14px;font-family:var(--mono);font-size:12px;
  color:var(--ink-300);letter-spacing:.04em;
}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line);margin-top:4px;}
.faq details{border-bottom:1px solid var(--line);}
.faq summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  gap:24px;padding:22px 4px;font-size:16px;font-weight:600;color:var(--ink-900);
  transition:color 150ms var(--ease);
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary:hover{color:var(--copper-700);}
.faq summary .sign{position:relative;width:16px;height:16px;flex:0 0 auto;}
.faq summary .sign::before,
.faq summary .sign::after{
  content:"";position:absolute;background:var(--ink-500);border-radius:2px;
  transition:transform 220ms var(--ease),background 150ms var(--ease);
}
.faq summary .sign::before{left:0;top:7px;width:16px;height:2px;}
.faq summary .sign::after{left:7px;top:0;width:2px;height:16px;}
.faq details[open] summary{color:var(--copper-700);}
.faq details[open] summary .sign::before{background:var(--copper-600);}
.faq details[open] summary .sign::after{transform:scaleY(0);}
.faq .faq-body{padding:0 4px 26px;max-width:880px;font-size:15px;line-height:1.9;color:var(--ink-500);}

/* ---------- CTA band ---------- */
.cta-section{padding:88px 0 96px;border-top:1px solid var(--line);}
.cta-band{
  background:var(--ink-900);border-radius:20px;
  padding:52px 48px;display:flex;flex-wrap:wrap;gap:36px;
  align-items:center;justify-content:space-between;
}
.cta-band h2{font-size:clamp(22px,2.2vw,30px);line-height:1.35;font-weight:700;color:#F5F3EF;letter-spacing:-.01em;}
.cta-band p{margin-top:12px;font-size:14.5px;line-height:1.8;color:rgba(245,243,239,.66);max-width:520px;}
.cta-side{display:flex;align-items:center;gap:26px;flex-wrap:wrap;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}
.qr{
  width:96px;height:96px;border-radius:12px;background:#fff;color:var(--ink-900);
  display:flex;align-items:center;justify-content:center;text-align:center;
  font-size:11.5px;line-height:1.5;padding:8px;flex:0 0 auto;
}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink-900);color:rgba(245,243,239,.72);padding:64px 0 28px;margin-top:auto;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px;}
.footer-brand .brand-mark{box-shadow:none;}
.footer-brand span{display:flex;flex-direction:column;line-height:1.3;}
.footer-brand strong{color:#F5F3EF;font-size:15.5px;font-weight:700;}
.footer-brand em{font-style:normal;font-size:11.5px;letter-spacing:.16em;color:rgba(245,243,239,.42);}
.footer-col p{font-size:14px;line-height:1.8;color:rgba(245,243,239,.6);max-width:360px;}
.footer-col p.mono{margin-top:12px;font-size:12.5px;color:rgba(245,243,239,.45);}
.footer-col h3{font-size:12.5px;font-weight:600;letter-spacing:.12em;color:#F5F3EF;margin-bottom:16px;}
.footer-col ul{display:grid;gap:10px;}
.footer-col li{font-size:14px;color:rgba(245,243,239,.65);line-height:1.6;}
.footer-col a{font-size:14px;color:rgba(245,243,239,.72);transition:color 150ms var(--ease);}
.footer-col a:hover{color:var(--copper-600);text-decoration:underline;text-underline-offset:3px;}
.footer-bottom{
  margin-top:48px;padding-top:24px;border-top:1px solid rgba(245,243,239,.12);
  display:flex;flex-wrap:wrap;gap:10px 28px;justify-content:space-between;
  font-size:13px;color:rgba(245,243,239,.46);
}
.footer-bottom .mono{font-size:12.5px;}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 400ms var(--ease),transform 400ms var(--ease);}
.reveal.is-in{opacity:1;transform:none;}

/* ---------- Skeleton / empty ---------- */
.empty-state{
  border:1px dashed var(--line);border-radius:var(--radius-card);
  padding:38px 28px;text-align:center;background:rgba(255,255,255,.6);
}
.empty-state p{font-size:14.5px;color:var(--ink-500);}
.empty-state .btn{margin-top:18px;}

/* ---------- Breakpoints ---------- */
@media (max-width:1439px){
  :root{--side-w:248px;}
  .main-inner{padding:0 34px;}
}
@media (max-width:1199px){
  :root{--side-w:76px;}
  .sidebar{padding:18px 10px 14px;align-items:center;}
  .side-top{padding:0 0 16px;width:100%;display:flex;justify-content:center;}
  .brand-text{display:none;}
  .side-nav{width:100%;align-items:center;}
  .side-link{width:48px;justify-content:center;padding:0;gap:0;}
  .side-link .side-txt{display:none;}
  .side-link::before{left:-10px;}
  .side-bottom{align-items:center;width:100%;}
  .side-bottom .btn{padding:0;width:44px;font-size:0;gap:0;}
  .side-bottom .btn::after{content:"下";font-size:14px;}
  .side-ver{display:none;}
  .hero-grid{gap:40px;}
  .band{gap:38px;}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:1023px){
  .sidebar{display:none;}
  .main-wrap{margin-left:0;}
  .mobile-bar{display:flex;}
  .main{padding-top:56px;}
  .main-inner{padding:0 24px;}
  .section{padding:72px 0;}
  .page-hero{padding:20px 0 64px;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-float{left:auto;right:14px;bottom:14px;width:206px;padding:14px;}
  .band{grid-template-columns:1fr;gap:26px;padding:28px 0;}
  .band.reverse .band-media{order:0;}
  .band-body h3{font-size:18.5px;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:34px;}
  .cta-band{padding:40px 32px;}
  .cta-section{padding:72px 0;}
}
@media (max-width:767px){
  .main-inner{padding:0 18px;}
  .section{padding:56px 0;}
  .section-head{margin-bottom:32px;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .hero-actions .btn{width:100%;}
  .hero-float{position:static;width:100%;margin-top:16px;}
  .metric-bar{grid-template-columns:repeat(2,minmax(0,1fr));}
  .flow{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;gap:30px;}
  .cta-band{padding:32px 22px;border-radius:16px;}
  .cta-side{width:100%;justify-content:flex-start;gap:18px;}
  .cta-actions{width:100%;flex-direction:column;align-items:stretch;}
  .cta-actions .btn{width:100%;}
  .qr{width:84px;height:84px;font-size:11px;}
  .faq summary{font-size:15px;padding:18px 2px;}
  .crumbs{font-size:12.5px;}
}
@media (max-width:520px){
  .metric-bar{grid-template-columns:1fr;}
  .disc-table{min-width:0;}
  .spec-wrap{border:0;background:transparent;box-shadow:none;overflow:visible;}
  .spec-wrap table{min-width:0;width:100%;}
  .spec-wrap thead{display:none;}
  .spec-wrap tbody tr{
    display:block;background:var(--surface);border:1px solid var(--line);
    border-radius:var(--radius-card);padding:6px 16px;margin-bottom:12px;box-shadow:var(--shadow-sm);
  }
  .spec-wrap tbody td{
    display:flex;justify-content:space-between;gap:16px;
    padding:11px 0;border-bottom:1px dashed var(--line-soft);font-size:14px;
  }
  .spec-wrap tbody td:last-child{border-bottom:0;}
  .spec-wrap tbody td::before{
    content:attr(data-label);flex:0 0 auto;color:var(--ink-500);font-size:13px;font-weight:500;
  }
  .spec-wrap tbody td .cell-key{text-align:right;}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  .btn,.flow-step,.band-media img,.chip,.side-link{transition:none;}
  .btn:hover,.flow-step:hover,.chip:hover,.band-media img:hover{transform:none;}
}

/* roulang page: category3 */
:root{
  --copper-600:#C0562B;
  --copper-700:#A6461F;
  --copper-100:#FBEEE7;
  --amber:#E0A03C;
  --signal-600:#1E8C6E;
  --signal-100:#E6F4EF;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --danger:#B3261E;
  --r-card:14px;
  --r-btn:10px;
  --r-img:16px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh-2:0 1px 2px rgba(20,22,26,.04),0 8px 24px -12px rgba(20,22,26,.12);
  --sh-3:0 2px 4px rgba(20,22,26,.05),0 18px 38px -16px rgba(20,22,26,.20);
  --ease:cubic-bezier(.2,.7,.2,1);
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Roboto Mono",monospace;
  --side-w:264px;
}
@media (max-width:1439px){:root{--side-w:248px}}
@media (max-width:1199px){:root{--side-w:76px}}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-700);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0}
ul,ol{padding:0;list-style:none}
img{max-width:100%;display:block;border-radius:var(--r-img)}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--copper-600);outline-offset:2px;border-radius:6px}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

/* ============ 布局骨架 ============ */
.app{display:grid;grid-template-columns:var(--side-w) minmax(0,1fr);min-height:100vh}
.shell{display:flex;flex-direction:column;min-width:0}
.main-inner{width:100%;max-width:1240px;margin:0 auto;padding:0 32px}

/* ============ 侧栏导航 ============ */
.sidebar{
  position:sticky;top:0;height:100vh;overflow-y:auto;
  background:var(--surface);border-right:1px solid var(--line);
  display:flex;flex-direction:column;gap:16px;
  padding:22px 14px 18px;
}
.side-brand{display:flex;align-items:center;gap:11px;padding:4px 8px 16px;border-bottom:1px solid var(--line)}
.brand-mark{
  width:36px;height:36px;flex:0 0 36px;border-radius:11px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--copper-600),var(--amber));
  color:#fff;font-family:var(--mono);font-size:14px;font-weight:700;letter-spacing:.02em;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-text strong{font-size:15.5px;color:var(--ink-900);font-weight:700;letter-spacing:.01em}
.brand-text em{font-style:normal;font-size:11.5px;color:var(--ink-500);letter-spacing:.14em;font-family:var(--mono)}
.side-label{
  font-size:11.5px;letter-spacing:.14em;color:var(--ink-300);
  padding:0 10px;font-family:var(--mono);text-transform:uppercase;
}
.side-nav{display:flex;flex-direction:column;gap:4px;flex:1}
.side-link{
  position:relative;display:flex;align-items:center;gap:12px;
  height:44px;padding:0 12px;border-radius:10px;
  font-size:14.5px;color:var(--ink-700);
  transition:background .15s var(--ease),color .15s var(--ease),transform .15s var(--ease);
}
.side-link::before{
  content:"";position:absolute;left:0;top:50%;width:2px;height:20px;border-radius:2px;
  background:var(--copper-600);transform:translateY(-50%) scaleY(0);
  transition:transform .18s var(--ease);
}
.side-link:hover{background:#FAF8F4;color:var(--ink-900)}
.side-link:hover::before{transform:translateY(-50%) scaleY(1)}
.side-link.active{background:var(--copper-100);color:var(--copper-700);font-weight:700}
.side-link.active::before{transform:translateY(-50%) scaleY(1)}
.side-ico{
  width:24px;height:24px;flex:0 0 24px;border-radius:7px;
  display:grid;place-items:center;background:#F0EDE7;
  font-size:12px;color:var(--ink-500);font-weight:600;
}
.side-link.active .side-ico{background:var(--copper-600);color:#fff}
.side-foot{display:flex;flex-direction:column;gap:8px;padding-top:14px;border-top:1px solid var(--line)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.01em;white-space:nowrap;
  transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease),transform .12s var(--ease),box-shadow .2s var(--ease);
}
.btn .arw{transition:transform .18s var(--ease)}
.btn:hover .arw{transform:translateX(3px)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:var(--sh-1)}
.btn-primary:hover{background:var(--copper-700);box-shadow:var(--sh-2)}
.btn-ghost{border:1px solid var(--ink-900);color:var(--ink-900);background:transparent}
.btn-ghost:hover{background:var(--ink-900);color:#fff}
.btn-light{background:#fff;color:var(--ink-900)}
.btn-light:hover{background:var(--copper-100);color:var(--copper-700)}
.btn-outline-light{border:1px solid rgba(245,243,239,.42);color:#F5F3EF;background:transparent}
.btn-outline-light:hover{border-color:#F5F3EF;background:rgba(245,243,239,.10)}
.btn-sm{height:38px;padding:0 15px;font-size:13.5px;border-radius:9px}
.btn-block{width:100%}

/* ============ 徽章 / 标签 ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 11px;border-radius:var(--r-pill);
  font-size:12.5px;font-weight:600;line-height:1.7;white-space:nowrap;
}
.badge-copper{background:var(--copper-100);color:var(--copper-700)}
.badge-green{background:var(--signal-100);color:var(--signal-600)}
.badge-gray{background:#EFECE6;color:var(--ink-500)}
.badge-mono{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em}

/* ============ 移动端顶栏 ============ */
.topbar{
  display:none;align-items:center;gap:14px;
  height:56px;padding:0 16px;background:var(--surface);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:40;
}
.topbar .brand-text strong{font-size:14.5px}
.burger{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;border:1px solid var(--line)}
.burger span{display:block;width:16px;height:2px;background:var(--ink-900);border-radius:2px;position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink-900);border-radius:2px}
.burger span::before{top:-5px}
.burger span::after{top:5px}
.topbar .tb-right{margin-left:auto;display:flex;align-items:center;gap:10px}

.drawer-mask{
  position:fixed;inset:0;background:rgba(20,22,26,.45);
  opacity:0;visibility:hidden;transition:opacity .22s var(--ease),visibility .22s var(--ease);z-index:60;
}
.drawer-mask.open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;right:0;height:100%;width:88%;max-width:360px;
  background:var(--surface);z-index:70;padding:20px 16px;
  display:flex;flex-direction:column;gap:14px;
  transform:translateX(102%);transition:transform .28s var(--ease);
  box-shadow:-16px 0 40px -20px rgba(20,22,26,.4);
  overflow-y:auto;
}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:12px;border-bottom:1px solid var(--line)}
.drawer-close{width:34px;height:34px;border-radius:9px;border:1px solid var(--line);font-size:16px;color:var(--ink-500)}
.drawer .side-link{height:52px}

/* ============ 面包屑 ============ */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  padding-top:26px;font-size:13px;color:var(--ink-500);
}
.crumb a{transition:color .15s var(--ease)}
.crumb a:hover{color:var(--copper-600)}
.crumb .sep{color:var(--ink-300);font-family:var(--mono)}
.crumb .cur{color:var(--ink-700);font-weight:600}

/* ============ 页头 ============ */
.page-head{padding:30px 0 44px}
.eyebrow{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;
  color:var(--copper-600);text-transform:uppercase;margin-bottom:14px;
}
.page-head h1{
  font-size:clamp(30px,4.2vw,54px);font-weight:700;line-height:1.16;
  letter-spacing:-.02em;color:var(--ink-900);max-width:19em;
}
.lede{
  margin-top:18px;max-width:60ch;font-size:16.5px;line-height:1.9;color:var(--ink-500);
}
.head-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}

/* ============ 指标条 ============ */
.stat-row{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.stat{padding:26px 22px;border-right:1px solid var(--line);transition:background .2s var(--ease)}
.stat:last-child{border-right:0}
.stat:hover{background:rgba(255,255,255,.7)}
.stat b{
  display:block;font-family:var(--mono);font-size:clamp(24px,2.6vw,32px);
  font-weight:700;color:var(--ink-900);letter-spacing:-.01em;line-height:1.2;
}
.stat b i{font-style:normal;font-size:15px;color:var(--ink-500);margin-left:4px}
.stat span{display:block;margin-top:6px;font-size:13.5px;color:var(--ink-500)}

/* ============ 通用板块 ============ */
.section{padding:88px 0}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:18px;justify-content:space-between;margin-bottom:36px}
.section-head h2{
  font-size:clamp(24px,2.6vw,34px);font-weight:700;color:var(--ink-900);
  letter-spacing:-.015em;line-height:1.25;position:relative;padding-bottom:12px;
}
.section-head h2::after{
  content:"";position:absolute;left:0;bottom:0;width:56px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--copper-600),var(--amber));
}
.section-head p{margin-top:12px;max-width:62ch;font-size:15.5px;color:var(--ink-500)}
.section-head .link-more{
  font-size:14px;font-weight:600;color:var(--copper-600);display:inline-flex;align-items:center;gap:6px;
}
.section-head .link-more:hover{color:var(--copper-700)}
.section-head .link-more:hover .arw{transform:translateX(3px)}
.section-head .link-more .arw{transition:transform .18s var(--ease)}

/* ============ 必读文档卡 ============ */
.must-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.must-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--sh-1);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.must-card:hover{transform:translateY(-2px);box-shadow:var(--sh-3);border-color:#D8D2C7}
.must-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#E9E5DE}
.must-thumb img{width:100%;height:100%;object-fit:cover;border-radius:0}
.must-thumb .badge{position:absolute;left:14px;bottom:14px}
.must-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:11px;flex:1}
.must-body h3{font-size:18px;font-weight:600;color:var(--ink-900);line-height:1.5}
.must-body p{font-size:14px;color:var(--ink-500);line-height:1.78}
.must-meta{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  font-size:12.5px;color:var(--ink-300);font-family:var(--mono);
}

/* ============ 文档检索区 ============ */
.doc-layout{display:grid;grid-template-columns:248px minmax(0,1fr);gap:32px;align-items:start}
.filter-panel{
  position:sticky;top:24px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:20px;box-shadow:var(--sh-1);
}
.filter-panel h3{
  font-size:11.5px;letter-spacing:.14em;color:var(--ink-300);
  font-family:var(--mono);text-transform:uppercase;margin-bottom:12px;
}
.filter-group{padding-bottom:18px;margin-bottom:18px;border-bottom:1px solid var(--line)}
.filter-group:last-of-type{border-bottom:0;margin-bottom:0;padding-bottom:0}
.search-field{position:relative;margin-bottom:20px}
.search-field input{
  width:100%;height:44px;padding:0 12px 0 36px;
  border:1px solid var(--line);border-radius:var(--r-btn);
  background:#FCFBF9;font-size:14px;
  transition:border-color .15s var(--ease),box-shadow .15s var(--ease);
}
.search-field input::placeholder{color:var(--ink-300)}
.search-field input:focus{
  outline:none;border-color:var(--copper-600);
  box-shadow:0 0 0 4px var(--copper-100);
}
.search-field .ico{
  position:absolute;left:12px;top:50%;transform:translateY(-50%);
  font-size:13px;color:var(--ink-300);
}
.chip-list{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:6px 13px;border-radius:var(--r-pill);border:1px solid var(--line);
  font-size:13px;color:var(--ink-500);background:#FCFBF9;
  transition:all .15s var(--ease);
}
.chip:hover{border-color:var(--copper-600);color:var(--copper-700)}
.chip.on{background:var(--copper-100);border-color:var(--copper-600);color:var(--copper-700);font-weight:600}
.filter-note{
  margin-top:18px;padding:14px 15px;border-radius:12px;
  background:var(--signal-100);border:1px solid #CFE7DE;
}
.filter-note strong{display:block;font-size:13.5px;color:var(--signal-600);margin-bottom:4px}
.filter-note span{font-size:12.5px;color:var(--ink-500);line-height:1.7;display:block}

.doc-list{border:1px solid var(--line);border-radius:var(--r-card);background:var(--surface);overflow:hidden;box-shadow:var(--sh-1)}
.doc-list-head{
  display:grid;grid-template-columns:56px minmax(0,1fr) 84px 88px 108px;
  gap:14px;align-items:center;padding:14px 20px;
  font-size:11.5px;letter-spacing:.12em;color:var(--ink-300);
  background:#FAF8F4;border-bottom:1px solid var(--line);text-transform:uppercase;
}
.doc-row{
  display:grid;grid-template-columns:56px minmax(0,1fr) 84px 88px 108px;
  gap:14px;align-items:center;padding:18px 20px;
  border-bottom:1px solid var(--line);
  transition:background .15s var(--ease);
}
.doc-row:last-child{border-bottom:0}
.doc-row:hover{background:#FCFAF7}
.doc-row:hover .doc-no{background:var(--copper-600);color:#fff}
.doc-row:hover .doc-title{color:var(--copper-700)}
.doc-no{
  width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
  font-family:var(--mono);font-size:13px;font-weight:700;
  background:#F0EDE7;color:var(--ink-500);
  transition:background .15s var(--ease),color .15s var(--ease);
}
.doc-main{min-width:0;display:flex;flex-direction:column;gap:5px}
.doc-title{font-size:15.5px;font-weight:600;color:var(--ink-900);line-height:1.5;transition:color .15s var(--ease)}
.doc-desc{font-size:13.5px;color:var(--ink-500);line-height:1.7}
.doc-cell{font-size:12.5px;color:var(--ink-500);font-family:var(--mono);white-space:nowrap}
.doc-cell.cell-date{color:var(--ink-300)}

/* ============ 接口示例 ============ */
.code-wrap{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:24px}
.code-card{
  background:var(--ink-900);border-radius:var(--r-card);padding:22px 24px 24px;
  box-shadow:var(--sh-2);overflow:hidden;
}
.code-card .code-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:14px;margin-bottom:16px;border-bottom:1px solid rgba(245,243,239,.14);
}
.code-card .code-head span{font-size:12px;letter-spacing:.12em;color:rgba(245,243,239,.55);font-family:var(--mono);text-transform:uppercase}
.code-card .code-head em{font-style:normal;font-size:12.5px;color:var(--amber);font-family:var(--mono)}
.code-card pre{
  margin:0;overflow-x:auto;font-family:var(--mono);font-size:13px;line-height:1.85;
  color:#E9E5DE;
}
.code-card pre .k{color:var(--amber)}
.code-card pre .s{color:#7FD3B4}
.code-card pre .c{color:rgba(245,243,239,.42)}
.code-side{display:flex;flex-direction:column;gap:16px}
.side-note{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:20px 22px;box-shadow:var(--sh-1);transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.side-note:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.side-note h3{font-size:16.5px;font-weight:600;color:var(--ink-900);margin-bottom:8px}
.side-note p{font-size:14px;color:var(--ink-500);line-height:1.8}
.side-note .n{font-family:var(--mono);font-size:12px;color:var(--copper-600);letter-spacing:.1em;display:block;margin-bottom:8px}

/* ============ 时间轴 ============ */
.timeline{position:relative;padding-left:26px}
.timeline::before{content:"";position:absolute;left:5px;top:8px;bottom:8px;width:1px;background:var(--line)}
.timeline li{position:relative;padding:0 0 30px 0;display:grid;grid-template-columns:120px minmax(0,1fr);gap:22px;align-items:start}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{
  content:"";position:absolute;left:-26px;top:9px;width:11px;height:11px;border-radius:50%;
  background:var(--surface);border:2px solid var(--copper-600);
}
.timeline .tl-date{font-family:var(--mono);font-size:13px;color:var(--ink-500);padding-top:2px}
.timeline h3{font-size:16.5px;font-weight:600;color:var(--ink-900);margin-bottom:6px}
.timeline p{font-size:14px;color:var(--ink-500);line-height:1.8}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 4px;font-size:16px;font-weight:600;color:var(--ink-900);
  transition:color .15s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--copper-700)}
.faq-item summary .sign{
  position:relative;width:18px;height:18px;flex:0 0 18px;
}
.faq-item summary .sign::before,
.faq-item summary .sign::after{
  content:"";position:absolute;background:var(--copper-600);border-radius:2px;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.faq-item summary .sign::before{left:0;top:8px;width:18px;height:2px}
.faq-item summary .sign::after{top:0;left:8px;width:2px;height:18px}
.faq-item[open] summary .sign::after{transform:scaleY(0);opacity:0}
.faq-body{padding:0 4px 26px;max-width:76ch}
.faq-body p{font-size:15px;line-height:1.9;color:var(--ink-500)}

/* ============ CTA 深色带 ============ */
.cta-band{
  background-color:var(--ink-900);
  background-image:linear-gradient(rgba(20,22,26,.93),rgba(20,22,26,.95)),url(/assets/images/backpic/back-1.webp);
  background-size:cover;background-position:center;
  padding:64px 0;margin-top:8px;
}
.cta-inner{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:40px;align-items:center}
.cta-copy h2{font-size:clamp(22px,2.4vw,30px);font-weight:700;color:#F5F3EF;letter-spacing:-.01em;line-height:1.3}
.cta-copy p{margin-top:12px;font-size:15px;color:rgba(245,243,239,.62);max-width:46ch;line-height:1.85}
.cta-actions{display:flex;flex-direction:column;gap:10px;min-width:220px}
.cta-actions .meta-line{font-family:var(--mono);font-size:12px;color:rgba(245,243,239,.5);text-align:center}
.qr-box{
  width:104px;height:104px;border-radius:12px;background:#F5F3EF;
  display:grid;place-items:center;text-align:center;
  font-family:var(--mono);font-size:11px;color:var(--ink-500);line-height:1.5;
  border:1px solid rgba(245,243,239,.3);
}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:rgba(245,243,239,.72);padding:64px 0 30px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.15fr;gap:40px}
.footer-col h3{
  font-size:11.5px;letter-spacing:.14em;color:rgba(245,243,239,.45);
  text-transform:uppercase;font-family:var(--mono);margin-bottom:16px;
}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-brand strong{display:block;font-size:16px;color:#F5F3EF;font-weight:700;line-height:1.3}
.footer-brand em{display:block;font-style:normal;font-size:11px;letter-spacing:.14em;color:rgba(245,243,239,.42);font-family:var(--mono)}
.footer-col p{font-size:13.5px;line-height:1.85;color:rgba(245,243,239,.6);max-width:38ch}
.footer-col p.mono{margin-top:12px;color:rgba(245,243,239,.42);font-size:12.5px}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col ul li{font-size:13.5px;color:rgba(245,243,239,.6)}
.footer-col ul a{position:relative;transition:color .15s var(--ease)}
.footer-col ul a:hover{color:var(--amber);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{
  margin-top:48px;padding-top:22px;border-top:1px solid rgba(245,243,239,.12);
  display:flex;flex-wrap:wrap;gap:14px 26px;justify-content:space-between;
  font-size:12.5px;color:rgba(245,243,239,.42);
}
.footer-bottom .mono{color:rgba(245,243,239,.34)}

/* ============ 进入动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .main-inner{padding:0 26px}
  .side-txt,.side-label,.brand-text{display:none}
  .sidebar{align-items:center;padding:20px 10px}
  .side-brand{justify-content:center;padding:2px 0 16px;width:100%}
  .side-link{justify-content:center;padding:0;width:52px}
  .side-link::before{display:none}
  .side-foot{align-items:center;width:100%}
  .side-foot .side-ver{display:none}
  .side-foot .btn{width:44px;padding:0;font-size:0}
  .side-foot .btn::after{content:"↓";font-size:16px}
  .doc-layout{grid-template-columns:212px minmax(0,1fr);gap:24px}
  .doc-list-head,.doc-row{grid-template-columns:48px minmax(0,1fr) 78px 96px}
  .doc-list-head .h-size,.doc-row .cell-size{display:none}
  .code-wrap{grid-template-columns:minmax(0,1fr)}
  .cta-inner{grid-template-columns:minmax(0,1fr) auto;gap:28px}
  .qr-box{display:none}
}
@media (max-width:1023px){
  .app{grid-template-columns:minmax(0,1fr)}
  .sidebar{display:none}
  .topbar{display:flex}
  .section{padding:72px 0}
  .must-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .doc-layout{grid-template-columns:minmax(0,1fr)}
  .filter-panel{position:static}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-inner{grid-template-columns:minmax(0,1fr)}
  .cta-actions{flex-direction:row;flex-wrap:wrap;min-width:0}
}
@media (max-width:767px){
  .main-inner{padding:0 18px}
  .section{padding:56px 0}
  .page-head{padding:22px 0 34px}
  .stat-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat{border-right:1px solid var(--line)}
  .stat:nth-child(2n){border-right:0}
  .stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--line)}
  .must-grid{grid-template-columns:minmax(0,1fr)}
  .doc-list-head,.doc-row{grid-template-columns:40px minmax(0,1fr);gap:12px}
  .doc-row .doc-cell{grid-column:2;color:var(--ink-400,#9AA0AB)}
  .doc-row .cell-fmt{display:inline-flex;justify-self:start}
  .doc-list-head .h-fmt,.doc-list-head .h-size,.doc-list-head .h-date{display:none}
  .doc-row{padding:16px 16px 18px}
  .doc-row .doc-meta-line{display:flex;flex-wrap:wrap;gap:10px;grid-column:2}
  .timeline li{grid-template-columns:minmax(0,1fr);gap:6px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{flex-direction:column;gap:8px}
  .cta-actions .btn{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category4 */
:root{
  --copper-600:#C0562B;
  --copper-700:#A6461F;
  --copper-100:#FBEEE7;
  --amber:#E0A03C;
  --signal-600:#1E8C6E;
  --signal-100:#E8F5F0;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --line-soft:#EFEBE4;
  --danger:#B3261E;
  --r-card:14px;
  --r-btn:10px;
  --r-img:16px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh-2:0 1px 2px rgba(20,22,26,.04),0 8px 24px -12px rgba(20,22,26,.12);
  --sh-3:0 2px 4px rgba(20,22,26,.05),0 18px 40px -18px rgba(20,22,26,.22);
  --ease:cubic-bezier(.2,.7,.2,1);
  --side-w:264px;
  --font-cn:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"Roboto Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
html{-webkit-text-size-adjust:100%;}
body{
  background:var(--paper);
  color:var(--ink-700);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-img);}
a{color:inherit;text-decoration:none;transition:color .15s var(--ease);}
a:hover{color:var(--copper-600);}
button,input,select,textarea{font:inherit;color:inherit;}
button{cursor:pointer;border:0;background:none;}
h1,h2,h3,h4{margin:0;color:var(--ink-900);line-height:1.28;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--copper-600);outline-offset:2px;border-radius:4px;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em;}

/* ---------- App Shell ---------- */
.app-shell{min-height:100vh;}
.side-shell{
  position:fixed;top:0;left:0;bottom:0;width:var(--side-w);
  background:var(--surface);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  padding:22px 18px 18px;
  z-index:60;
}
.side-brand{display:flex;align-items:center;gap:10px;padding:4px 6px 20px;border-bottom:1px solid var(--line-soft);}
.brand-mark{
  width:38px;height:38px;flex:0 0 38px;border-radius:11px;
  background:linear-gradient(135deg,var(--copper-600),var(--amber));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-weight:700;font-size:15px;letter-spacing:.02em;
}
.side-brand-txt strong{display:block;font-size:15px;color:var(--ink-900);letter-spacing:-.01em;}
.side-brand-txt em{display:block;font-style:normal;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--ink-300);margin-top:2px;}
.side-nav{display:flex;flex-direction:column;gap:4px;margin-top:16px;flex:1;overflow-y:auto;}
.side-link{
  position:relative;display:flex;align-items:center;gap:11px;height:44px;padding:0 12px;
  border-radius:10px;color:var(--ink-500);font-size:14.5px;font-weight:500;
  transition:background .15s var(--ease),color .15s var(--ease);
}
.side-link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:2px;height:20px;border-radius:2px;background:var(--copper-600);
  transition:transform .18s var(--ease);
}
.side-link:hover{background:var(--paper);color:var(--ink-900);}
.side-link:hover::before{transform:translateY(-50%) scaleY(1);}
.side-link.active{background:var(--copper-100);color:var(--copper-700);font-weight:700;}
.side-link.active::before{transform:translateY(-50%) scaleY(1);}
.side-ico{
  width:24px;height:24px;flex:0 0 24px;border-radius:7px;
  background:var(--paper);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;color:var(--ink-500);
}
.side-link.active .side-ico{background:#fff;border-color:#EBD7C9;color:var(--copper-600);}
.side-txt{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.side-foot{margin-top:16px;padding-top:16px;border-top:1px solid var(--line-soft);}
.side-cta{
  display:flex;align-items:center;justify-content:center;gap:8px;
  height:42px;border-radius:var(--r-btn);background:var(--copper-600);color:#fff;
  font-size:14px;font-weight:600;transition:background .15s var(--ease),transform .15s var(--ease);
}
.side-cta:hover{background:var(--copper-700);color:#fff;}
.side-cta:active{transform:translateY(1px);}
.side-ver{margin-top:10px;font-family:var(--font-mono);font-size:11.5px;color:var(--ink-300);text-align:center;letter-spacing:.06em;}

.main-wrap{margin-left:var(--side-w);display:flex;flex-direction:column;min-height:100vh;}
.main-inner{width:100%;max-width:1240px;margin:0 auto;padding:0 32px;}

/* ---------- Topbar (mobile) ---------- */
.topbar{
  display:none;position:sticky;top:0;z-index:70;height:56px;
  background:rgba(255,255,255,.94);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  align-items:center;justify-content:space-between;padding:0 16px;
}
.topbar-brand{display:flex;align-items:center;gap:9px;}
.topbar-brand .brand-mark{width:30px;height:30px;flex:0 0 30px;border-radius:9px;font-size:12.5px;}
.topbar-brand strong{font-size:14.5px;color:var(--ink-900);}
.topbar-actions{display:flex;align-items:center;gap:8px;}
.icon-btn{
  width:38px;height:38px;border-radius:10px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;background:#fff;
  color:var(--ink-700);font-size:15px;transition:border-color .15s var(--ease),color .15s var(--ease);
}
.icon-btn:hover{border-color:var(--copper-600);color:var(--copper-600);}
.drawer-mask{
  position:fixed;inset:0;background:rgba(20,22,26,.42);z-index:80;
  opacity:0;visibility:hidden;transition:opacity .22s var(--ease),visibility .22s var(--ease);
}
.drawer-mask.open{opacity:1;visibility:visible;}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:88%;max-width:360px;z-index:90;
  background:#fff;transform:translateX(100%);
  transition:transform .28s var(--ease);
  display:flex;flex-direction:column;padding:18px;
}
.drawer.open{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:14px;border-bottom:1px solid var(--line-soft);}
.drawer-head strong{font-size:15px;color:var(--ink-900);}
.drawer-nav{margin-top:12px;flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:4px;}
.drawer-nav a{
  display:flex;align-items:center;gap:11px;height:52px;padding:0 12px;border-radius:10px;
  font-size:15px;color:var(--ink-700);
}
.drawer-nav a.active{background:var(--copper-100);color:var(--copper-700);font-weight:700;}
.drawer-foot{padding-top:14px;border-top:1px solid var(--line-soft);display:flex;flex-direction:column;gap:8px;}
.drawer-foot .side-cta{height:46px;}

/* ---------- Shared bits ---------- */
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-500);padding:26px 0 0;}
.crumb a{color:var(--ink-500);}
.crumb a:hover{color:var(--copper-600);}
.crumb .sep{color:var(--ink-300);}
.crumb .cur{color:var(--ink-700);font-weight:600;}
.badge{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;
  border-radius:var(--r-pill);font-size:12.5px;font-weight:600;letter-spacing:.01em;
}
.badge-copper{background:var(--copper-100);color:var(--copper-700);}
.badge-signal{background:var(--signal-100);color:var(--signal-600);}
.badge-grey{background:#EEEBE5;color:var(--ink-500);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;
  transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease),transform .15s var(--ease),box-shadow .15s var(--ease);
}
.btn .arw{transition:transform .18s var(--ease);font-family:var(--font-mono);}
.btn:hover .arw{transform:translateX(3px);}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:var(--sh-1);}
.btn-primary:hover{background:var(--copper-700);color:#fff;box-shadow:var(--sh-2);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{background:transparent;color:var(--ink-900);border:1px solid var(--ink-900);}
.btn-ghost:hover{background:var(--ink-900);color:#fff;}
.btn-ghost:active{transform:translateY(1px);}
.btn-quiet{background:#fff;color:var(--ink-700);border:1px solid var(--line);}
.btn-quiet:hover{border-color:var(--copper-600);color:var(--copper-700);}
.sec{padding:96px 0;}
.sec-tight{padding:72px 0;}
.sec-head{margin-bottom:40px;max-width:760px;}
.sec-num{
  display:inline-block;font-family:var(--font-mono);font-size:12.5px;font-weight:700;
  letter-spacing:.14em;color:var(--copper-600);margin-bottom:12px;
}
.sec-head h2{font-size:clamp(24px,2.6vw,34px);font-weight:700;letter-spacing:-.01em;}
.sec-head h2 i{font-style:normal;display:inline-block;padding-bottom:4px;background-image:linear-gradient(90deg,var(--copper-600),var(--amber));background-repeat:no-repeat;background-size:100% 2px;background-position:0 100%;}
.sec-head p{margin-top:14px;color:var(--ink-500);font-size:15.5px;max-width:680px;}

/* ---------- Page hero ---------- */
.page-hero{
  position:relative;overflow:hidden;padding:52px 0 88px;
  background:
    linear-gradient(115deg,rgba(20,22,26,.94),rgba(20,22,26,.80)),
    url("/assets/images/backpic/back-2.png") center/cover no-repeat;
  color:#EDE9E2;
}
.page-hero .main-inner{position:relative;z-index:2;}
.page-hero .crumb{color:#B9B4AC;padding-top:0;}
.page-hero .crumb a{color:#CFCAC2;}
.page-hero .crumb a:hover{color:#fff;}
.page-hero .crumb .sep{color:#7A756D;}
.page-hero .crumb .cur{color:#fff;}
.hero-tagrow{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0 20px;}
.hero-tagrow .badge{background:rgba(255,255,255,.10);color:#F0ECE5;border:1px solid rgba(255,255,255,.16);}
.page-hero h1{
  color:#fff;font-size:clamp(30px,4.2vw,52px);font-weight:700;letter-spacing:-.02em;
  max-width:900px;
}
.page-hero .hero-sub{margin-top:18px;max-width:660px;font-size:16.5px;color:#C9C4BC;line-height:1.85;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;}
.page-hero .btn-ghost{border-color:rgba(255,255,255,.5);color:#fff;}
.page-hero .btn-ghost:hover{background:#fff;color:var(--ink-900);border-color:#fff;}
.hero-note{margin-top:22px;font-family:var(--font-mono);font-size:12.5px;color:#9E9991;letter-spacing:.04em;}

/* ---------- Metrics ---------- */
.metric-band{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-2);
  display:grid;grid-template-columns:repeat(4,1fr);
  margin-top:-52px;position:relative;z-index:5;overflow:hidden;
}
.metric{
  padding:28px 26px;border-right:1px solid var(--line-soft);
}
.metric:last-child{border-right:0;}
.metric .num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(30px,3.4vw,42px);font-weight:700;color:var(--ink-900);line-height:1.1;
  letter-spacing:-.02em;
}
.metric .num small{font-size:16px;font-weight:600;color:var(--ink-500);margin-left:4px;}
.metric .lab{margin-top:10px;font-size:14px;color:var(--ink-500);}
.metric .sub{margin-top:6px;font-family:var(--font-mono);font-size:11.5px;color:var(--ink-300);letter-spacing:.06em;}

/* ---------- Channel layout ---------- */
.channel-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:start;}
.channel-list{display:flex;flex-direction:column;}
.channel-item{
  display:grid;grid-template-columns:56px 1fr;gap:18px;
  padding:24px 18px 24px 8px;border-bottom:1px solid var(--line);
  transition:background .15s var(--ease);
}
.channel-item:first-child{border-top:1px solid var(--line);}
.channel-item:hover{background:#FBF9F6;}
.channel-item .ci-no{
  font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--copper-600);
  letter-spacing:.08em;padding-top:3px;
}
.channel-item h3{font-size:18px;font-weight:600;display:flex;flex-wrap:wrap;align-items:center;gap:10px;}
.channel-item p{margin-top:8px;font-size:14.5px;color:var(--ink-500);}
.channel-item .meta{margin-top:10px;font-family:var(--font-mono);font-size:12.5px;color:var(--ink-300);letter-spacing:.03em;}
.channel-aside{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;box-shadow:var(--sh-1);
}
.channel-aside img{width:100%;aspect-ratio:16/10;object-fit:cover;margin-bottom:18px;}
.channel-aside h3{font-size:17px;font-weight:600;}
.channel-aside ul{margin-top:14px;display:flex;flex-direction:column;gap:11px;}
.channel-aside li{
  display:flex;gap:10px;font-size:14px;color:var(--ink-500);
  padding-bottom:11px;border-bottom:1px dashed var(--line);
}
.channel-aside li:last-child{border-bottom:0;padding-bottom:0;}
.channel-aside li b{color:var(--ink-900);font-weight:600;}
.tick{
  flex:0 0 16px;width:16px;height:16px;border-radius:50%;margin-top:6px;
  background:var(--signal-100);color:var(--signal-600);
  font-size:10px;display:flex;align-items:center;justify-content:center;font-weight:700;
}

/* ---------- Process ---------- */
.process{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line);}
.step{
  position:relative;padding:30px 24px 30px 0;border-right:1px solid var(--line-soft);
}
.step:last-child{border-right:0;}
.step .dot{
  width:11px;height:11px;border-radius:50%;background:var(--copper-600);
  margin-bottom:16px;box-shadow:0 0 0 4px var(--copper-100);
}
.step h3{font-size:16.5px;font-weight:600;}
.step p{margin-top:8px;font-size:14px;color:var(--ink-500);}
.step .step-no{position:absolute;top:26px;right:22px;font-family:var(--font-mono);font-size:12.5px;color:var(--ink-300);letter-spacing:.1em;}

/* ---------- FAQ ---------- */
.faq-wrap{display:grid;grid-template-columns:.72fr 1.28fr;gap:56px;align-items:start;}
.faq-aside h2{font-size:clamp(24px,2.6vw,32px);}
.faq-aside p{margin-top:14px;color:var(--ink-500);font-size:15px;}
.faq-aside .faq-help{
  margin-top:24px;padding:18px 20px;border:1px dashed var(--line);border-radius:var(--r-card);
  background:#FBF9F6;font-size:14px;color:var(--ink-500);
}
.faq-aside .faq-help strong{color:var(--ink-900);display:block;margin-bottom:6px;font-size:14.5px;}
.faq-list{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:20px;
  padding:22px 6px;text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);
  transition:color .15s var(--ease),padding .15s var(--ease);
}
.faq-q:hover{color:var(--copper-600);padding-left:12px;}
.faq-sign{position:relative;flex:0 0 18px;width:18px;height:18px;}
.faq-sign::before,.faq-sign::after{
  content:"";position:absolute;background:var(--copper-600);border-radius:2px;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.faq-sign::before{left:0;top:8px;width:18px;height:2px;}
.faq-sign::after{left:8px;top:0;width:2px;height:18px;}
.faq-item.open .faq-sign::after{transform:scaleY(0);opacity:0;}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease);}
.faq-a p{padding:0 46px 24px 6px;font-size:15px;color:var(--ink-500);line-height:1.9;}

/* ---------- Contact ---------- */
.contact-band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.contact-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:start;}
.form-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:30px;box-shadow:var(--sh-1);
}
.form-row{margin-bottom:18px;}
.form-row label{display:block;font-size:13px;font-weight:600;color:var(--ink-700);margin-bottom:8px;letter-spacing:.01em;}
.form-row .req{color:var(--copper-600);margin-left:3px;}
.field{
  width:100%;height:46px;padding:0 14px;border-radius:10px;
  border:1px solid var(--line);background:#fff;color:var(--ink-900);
  transition:border-color .15s var(--ease),box-shadow .15s var(--ease);
}
textarea.field{height:auto;min-height:120px;padding:12px 14px;line-height:1.75;resize:vertical;}
select.field{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--ink-500) 50%),linear-gradient(135deg,var(--ink-500) 50%,transparent 50%);background-position:calc(100% - 20px) 21px,calc(100% - 15px) 21px;background-size:5px 5px,5px 5px;background-repeat:no-repeat;}
.field:hover{border-color:#CFC8BC;}
.field:focus{outline:none;border-color:var(--copper-600);box-shadow:0 0 0 4px rgba(192,86,43,.12);}
.form-grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.form-foot{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-top:8px;}
.form-hint{font-size:13px;color:var(--ink-300);}
.form-msg{
  margin-top:16px;padding:14px 16px;border-radius:10px;font-size:14px;display:none;
  background:var(--signal-100);color:#15634B;border:1px solid #C8E6DA;
}
.form-msg.show{display:block;}
.side-info{display:flex;flex-direction:column;gap:16px;}
.info-card{
  background:#FBF9F6;border:1px solid var(--line);border-radius:var(--r-card);padding:22px;
}
.info-card h3{font-size:16px;font-weight:600;margin-bottom:14px;}
.info-card dl{margin:0;display:flex;flex-direction:column;gap:12px;}
.info-card dt{font-size:12.5px;color:var(--ink-300);letter-spacing:.08em;font-family:var(--font-mono);}
.info-card dd{margin:4px 0 0;font-size:14.5px;color:var(--ink-700);}
.info-card img{width:100%;aspect-ratio:16/9;object-fit:cover;margin-bottom:16px;}
.status-line{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--signal-600);font-weight:600;}
.status-line .pulse{width:8px;height:8px;border-radius:50%;background:var(--signal-600);box-shadow:0 0 0 3px rgba(30,140,110,.16);}

/* ---------- CTA band ---------- */
.cta-band{
  background:var(--ink-900);color:#EDE9E2;border-radius:var(--r-card);
  padding:44px 40px;display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center;
  margin:0 0 0;overflow:hidden;position:relative;
}
.cta-band::after{
  content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(224,160,60,.18),transparent 68%);
}
.cta-band h2{color:#fff;font-size:clamp(22px,2.4vw,30px);}
.cta-band p{margin-top:12px;color:#A9A5A0;font-size:15px;max-width:560px;}
.cta-right{display:flex;flex-direction:column;align-items:flex-start;gap:14px;position:relative;z-index:2;}
.cta-btns{display:flex;flex-wrap:wrap;gap:12px;}
.cta-band .btn-primary{background:var(--copper-600);}
.cta-band .btn-primary:hover{background:#D2693C;}
.qr-box{
  width:96px;height:96px;border-radius:12px;background:#fff;display:flex;align-items:center;justify-content:center;
  color:var(--ink-300);font-size:11.5px;text-align:center;line-height:1.5;padding:6px;
}
.cta-sub{font-family:var(--font-mono);font-size:12px;color:#7F7B76;letter-spacing:.04em;}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink-900);color:#A9A5A0;margin-top:96px;}
.footer-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;
  padding:64px 0 44px;
}
.footer-col h3{color:#fff;font-size:14px;font-weight:600;letter-spacing:.06em;margin-bottom:16px;}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.footer-brand strong{display:block;color:#fff;font-size:15.5px;letter-spacing:-.01em;}
.footer-brand em{display:block;font-style:normal;font-family:var(--font-mono);font-size:10.5px;color:#6E6A66;letter-spacing:.14em;margin-top:3px;}
.footer-col p{font-size:14px;line-height:1.85;max-width:340px;}
.footer-col p.mono{font-family:var(--font-mono);color:#7F7B76;font-size:12.5px;margin-top:14px;letter-spacing:.04em;}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col li{font-size:14px;}
.footer-col a{color:#A9A5A0;border-bottom:1px solid transparent;transition:color .15s var(--ease),border-color .15s var(--ease);}
.footer-col a:hover{color:var(--copper-600);border-bottom-color:var(--copper-600);}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px 28px;align-items:center;justify-content:space-between;
  padding:22px 0 30px;border-top:1px solid rgba(255,255,255,.08);font-size:12.5px;color:#7F7B76;
}
.footer-bottom .mono{font-family:var(--font-mono);letter-spacing:.04em;}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease);}
.reveal.in{opacity:1;transform:none;}

/* ---------- Responsive ---------- */
@media (max-width:1439px){
  :root{--side-w:248px;}
  .main-inner{padding:0 28px;}
}
@media (max-width:1199px){
  :root{--side-w:76px;}
  .side-shell{padding:18px 12px;align-items:center;}
  .side-brand{padding:2px 0 18px;justify-content:center;}
  .side-brand-txt{display:none;}
  .side-link{justify-content:center;padding:0;gap:0;}
  .side-txt{display:none;}
  .side-ico{width:30px;height:30px;flex:0 0 30px;font-size:13px;}
  .side-link.active .side-ico{background:var(--copper-100);}
  .side-cta{width:42px;height:42px;padding:0;font-size:0;}
  .side-cta::before{content:"下";font-size:13px;font-weight:700;}
  .side-ver{font-size:9.5px;writing-mode:horizontal-tb;}
  .metric-band{grid-template-columns:repeat(2,1fr);}
  .metric:nth-child(2){border-right:0;}
  .metric:nth-child(1),.metric:nth-child(2){border-bottom:1px solid var(--line-soft);}
  .channel-grid{grid-template-columns:1fr;gap:32px;}
  .faq-wrap{grid-template-columns:1fr;gap:32px;}
  .contact-grid{grid-template-columns:1fr;gap:32px;}
  .process{grid-template-columns:repeat(2,1fr);}
  .step:nth-child(2){border-right:0;}
  .step:nth-child(1),.step:nth-child(2){border-bottom:1px solid var(--line-soft);}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:1023px){
  :root{--side-w:0px;}
  .side-shell{display:none;}
  .main-wrap{margin-left:0;}
  .topbar{display:flex;}
  .main-inner{padding:0 22px;}
  .sec{padding:72px 0;}
  .page-hero{padding:36px 0 72px;}
  .cta-band{grid-template-columns:1fr;padding:34px 26px;}
  .footer-grid{padding:52px 0 36px;}
}
@media (max-width:767px){
  .main-inner{padding:0 16px;}
  .sec{padding:56px 0;}
  .page-hero{padding:26px 0 60px;}
  .page-hero .hero-sub{font-size:15.5px;}
  .hero-actions .btn{width:100%;}
  .metric-band{grid-template-columns:1fr;margin-top:-40px;}
  .metric{border-right:0;border-bottom:1px solid var(--line-soft);padding:22px 20px;}
  .metric:last-child{border-bottom:0;}
  .process{grid-template-columns:1fr;}
  .step{border-right:0;border-bottom:1px solid var(--line-soft);padding:24px 0;}
  .step:last-child{border-bottom:0;}
  .step .step-no{top:24px;}
  .form-grid2{grid-template-columns:1fr;}
  .form-card{padding:22px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding:44px 0 30px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px;}
  .channel-item{grid-template-columns:1fr;gap:8px;}
  .channel-item .ci-no{padding-top:0;}
  .faq-q{font-size:15.5px;padding:18px 4px;}
  .faq-a p{padding:0 20px 20px 4px;}
  .cta-band{padding:28px 20px;}
  .cta-btns .btn{width:100%;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category5 */
:root{
  --copper-600:#C0562B;
  --copper-700:#A6461F;
  --copper-050:#FBEEE7;
  --amber:#E0A03C;
  --signal-600:#1E8C6E;
  --signal-050:#E7F4F0;
  --ink-900:#14161A;
  --ink-700:#2C3037;
  --ink-500:#5A606B;
  --ink-300:#9AA0AB;
  --paper:#F5F3EF;
  --surface:#FFFFFF;
  --line:#E4E0D8;
  --danger:#B3261E;
  --r-card:14px;
  --r-btn:10px;
  --r-img:16px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh-2:0 8px 24px -12px rgba(20,22,26,.12);
  --sh-3:0 16px 40px -18px rgba(20,22,26,.22);
  --ease:cubic-bezier(.2,.7,.2,1);
  --sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Roboto Mono","Cascadia Mono",Menlo,monospace;
  --side-w:264px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;background:var(--paper);color:var(--ink-700);
  font-family:var(--sans);font-size:16px;line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
button,input,textarea,select{font:inherit;color:inherit;}
button{cursor:pointer;background:none;border:none;}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--copper-600);outline-offset:2px;border-radius:4px;
}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;}

/* ============ 侧栏 ============ */
.sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--side-w);z-index:40;
  background:var(--surface);border-right:1px solid var(--line);
  display:flex;flex-direction:column;padding:22px 16px 18px;
  overflow-y:auto;
}
.brand{display:flex;align-items:center;gap:10px;padding:4px 6px 18px;border-bottom:1px solid var(--line);}
.brand-mark{
  width:38px;height:38px;flex:0 0 38px;border-radius:11px;
  background:linear-gradient(140deg,var(--copper-600),var(--amber));
  color:#fff;font-family:var(--mono);font-size:14px;font-weight:700;
  display:flex;align-items:center;justify-content:center;letter-spacing:.04em;
}
.brand-txt strong{display:block;font-size:15.5px;color:var(--ink-900);line-height:1.3;letter-spacing:-.01em;}
.brand-txt em{display:block;font-style:normal;font-size:10.5px;color:var(--ink-300);letter-spacing:.14em;font-family:var(--mono);}
.side-title{
  font-size:12px;letter-spacing:.12em;color:var(--ink-300);
  padding:20px 10px 8px;font-weight:600;
}
.side-nav{display:flex;flex-direction:column;gap:2px;}
.side-link{
  display:flex;align-items:center;gap:11px;height:44px;padding:0 12px;
  border-radius:10px;position:relative;color:var(--ink-700);font-size:14.5px;
  transition:background .15s var(--ease),color .15s var(--ease);
}
.side-link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:2px;height:20px;border-radius:2px;background:var(--copper-600);
  transition:transform .2s var(--ease);
}
.side-link:hover{background:var(--paper);}
.side-link:hover::before{transform:translateY(-50%) scaleY(1);}
.side-link.active{background:var(--copper-050);color:var(--copper-700);font-weight:600;}
.side-link.active::before{transform:translateY(-50%) scaleY(1);}
.side-ico{
  width:26px;height:26px;flex:0 0 26px;border-radius:8px;
  background:var(--paper);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-size:12.5px;color:var(--ink-500);
}
.side-link.active .side-ico{background:#fff;border-color:#EBD5C8;color:var(--copper-700);}
.side-txt{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.side-foot{margin-top:auto;padding-top:18px;border-top:1px solid var(--line);}
.side-dl{
  display:flex;align-items:center;justify-content:center;gap:8px;
  height:42px;border-radius:var(--r-btn);background:var(--copper-600);color:#fff;
  font-size:14px;font-weight:600;transition:background .15s var(--ease),transform .15s var(--ease);
}
.side-dl:hover{background:var(--copper-700);}
.side-dl:active{transform:translateY(1px);}
.side-ver{margin-top:10px;text-align:center;font-size:11.5px;color:var(--ink-300);}

/* ============ 主区 ============ */
.main{margin-left:var(--side-w);min-height:100vh;display:flex;flex-direction:column;}
.main-inner{width:100%;max-width:1240px;margin:0 auto;padding:0 32px;}
.topbar{
  display:none;position:sticky;top:0;z-index:30;height:56px;
  background:rgba(255,255,255,.94);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);align-items:center;justify-content:space-between;padding:0 16px;
}
.topbar .t-brand{display:flex;align-items:center;gap:9px;font-size:15px;font-weight:600;color:var(--ink-900);}
.topbar .t-brand .brand-mark{width:30px;height:30px;flex:0 0 30px;border-radius:9px;font-size:12px;}
.burger{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;background:#fff;}
.burger span{display:block;width:16px;height:2px;background:var(--ink-700);border-radius:2px;position:relative;}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink-700);border-radius:2px;}
.burger span::before{top:-5px;}
.burger span::after{top:5px;}
.drawer-mask{position:fixed;inset:0;background:rgba(20,22,26,.42);opacity:0;visibility:hidden;transition:opacity .25s var(--ease);z-index:50;}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:88%;max-width:340px;background:var(--surface);
  z-index:51;transform:translateX(102%);transition:transform .28s var(--ease);
  padding:20px 16px;display:flex;flex-direction:column;overflow-y:auto;
}
.drawer .side-link{height:52px;font-size:15.5px;}
body.drawer-open .drawer-mask{opacity:1;visibility:visible;}
body.drawer-open .drawer{transform:translateX(0);}
body.drawer-open{overflow:hidden;}

/* ============ 面包屑 ============ */
.crumb{padding:26px 0 0;font-size:13.5px;color:var(--ink-500);}
.crumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.crumb li{display:flex;align-items:center;gap:8px;}
.crumb li+li::before{content:"/";color:var(--ink-300);}
.crumb a:hover{color:var(--copper-700);text-decoration:underline;text-underline-offset:3px;}
.crumb [aria-current]{color:var(--ink-900);font-weight:600;}

/* ============ 页头 ============ */
.page-head{
  margin-top:22px;border-radius:var(--r-img);overflow:hidden;position:relative;
  background:var(--ink-900);color:#F5F3EF;
}
.page-head-bg{
  position:absolute;inset:0;
  background-image:linear-gradient(100deg,rgba(20,22,26,.94) 8%,rgba(20,22,26,.72) 52%,rgba(20,22,26,.42) 100%),url("/assets/images/backpic/back-1.webp");
  background-size:cover;background-position:center;
}
.page-head-in{position:relative;padding:60px 48px 52px;}
.pill-row{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:20px;}
.pill{
  display:inline-flex;align-items:center;gap:7px;height:28px;padding:0 13px;
  border-radius:var(--r-pill);font-size:12.5px;font-weight:600;letter-spacing:.02em;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);color:#F7EDE6;
}
.pill.solid{background:var(--copper-600);border-color:var(--copper-600);color:#fff;}
.pill.green{background:rgba(30,140,110,.22);border-color:rgba(30,140,110,.5);color:#B8E8DA;}
.page-head h1{
  font-size:clamp(30px,4.2vw,46px);line-height:1.22;font-weight:700;
  letter-spacing:-.02em;color:#fff;max-width:820px;
}
.page-head h1 .hl{
  background-image:linear-gradient(90deg,var(--copper-600),var(--amber));
  background-repeat:no-repeat;background-size:100% 2px;background-position:0 100%;
  padding-bottom:4px;
}
.page-head .lead{margin-top:16px;max-width:700px;font-size:16px;line-height:1.85;color:#CFC9C2;}
.head-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px;}
.head-meta{
  display:flex;flex-wrap:wrap;gap:28px;margin-top:38px;padding-top:24px;
  border-top:1px solid rgba(255,255,255,.16);
}
.head-meta div span{display:block;font-size:11.5px;letter-spacing:.12em;color:#9A938C;font-family:var(--mono);}
.head-meta div strong{display:block;font-size:20px;color:#fff;font-weight:700;}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);font-size:15px;font-weight:600;
  transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease),transform .15s var(--ease),box-shadow .15s var(--ease);
  border:1px solid transparent;white-space:nowrap;
}
.btn .arw{transition:transform .15s var(--ease);}
.btn:hover .arw{transform:translateX(3px);}
.btn-primary{background:var(--copper-600);color:#fff;box-shadow:var(--sh-1);}
.btn-primary:hover{background:var(--copper-700);box-shadow:var(--sh-2);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{border-color:var(--line);color:var(--ink-900);background:var(--surface);}
.btn-ghost:hover{border-color:var(--ink-900);}
.btn-light{border-color:rgba(255,255,255,.32);color:#F5F3EF;background:transparent;}
.btn-light:hover{border-color:#fff;background:rgba(255,255,255,.08);}
.btn-sm{height:38px;padding:0 15px;font-size:13.5px;}

/* ============ 通用板块 ============ */
.section{padding:96px 0;}
.section.tight{padding-top:64px;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:38px;flex-wrap:wrap;}
.sec-head .label{
  font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--copper-600);
  font-weight:700;display:block;margin-bottom:10px;
}
.sec-head h2{font-size:clamp(24px,2.6vw,32px);font-weight:700;color:var(--ink-900);letter-spacing:-.02em;line-height:1.3;}
.sec-head p{margin-top:10px;font-size:15px;color:var(--ink-500);max-width:620px;}
.link-more{font-size:14px;font-weight:600;color:var(--copper-700);display:inline-flex;align-items:center;gap:6px;}
.link-more:hover{text-decoration:underline;text-underline-offset:4px;}

/* ============ 品牌叙事 ============ */
.story{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;}
.story h2{font-size:clamp(24px,2.6vw,32px);font-weight:700;color:var(--ink-900);letter-spacing:-.02em;line-height:1.32;}
.story p{margin-top:16px;font-size:15.5px;color:var(--ink-500);line-height:1.9;}
.story-quote{
  margin-top:24px;padding:18px 20px;border-left:2px solid var(--copper-600);
  background:var(--copper-050);border-radius:0 10px 10px 0;
  font-size:15px;color:var(--ink-700);line-height:1.85;
}
.story-figure{position:relative;}
.story-figure img{border-radius:var(--r-img);box-shadow:var(--sh-2);width:100%;object-fit:cover;aspect-ratio:4/3;}
.story-card{
  position:absolute;left:-18px;bottom:-22px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-card);padding:16px 18px;
  box-shadow:var(--sh-3);min-width:196px;
}
.story-card span{display:block;font-size:11.5px;letter-spacing:.12em;color:var(--ink-300);font-family:var(--mono);}
.story-card strong{display:block;font-size:22px;color:var(--ink-900);font-weight:700;margin-top:4px;}

/* ============ 指标条 ============ */
.metrics{
  background:var(--ink-900);border-radius:var(--r-img);padding:44px 40px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:28px;position:relative;overflow:hidden;
}
.metrics::after{
  content:"";position:absolute;left:0;top:0;height:2px;width:100%;
  background:linear-gradient(90deg,var(--copper-600),var(--amber));
}
.metric span.m-label{display:block;font-size:12px;letter-spacing:.12em;color:#8E8880;font-family:var(--mono);}
.metric strong{
  display:block;margin-top:8px;font-family:var(--mono);font-size:clamp(28px,3.2vw,40px);
  font-weight:700;color:#fff;line-height:1.1;font-variant-numeric:tabular-nums;
}
.metric em{display:block;margin-top:10px;font-style:normal;font-size:13.5px;color:#A9A29A;line-height:1.7;}
.metric strong .unit{font-size:16px;color:var(--amber);margin-left:3px;}

/* ============ 品控流程编号条 ============ */
.flow{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line);}
.flow-item{
  display:grid;grid-template-columns:96px 1fr 1.15fr;gap:28px;align-items:start;
  padding:30px 8px;border-bottom:1px solid var(--line);
  transition:background .18s var(--ease),padding .18s var(--ease);
}
.flow-item:hover{background:var(--surface);padding-left:16px;padding-right:16px;}
.flow-num{
  font-family:var(--mono);font-size:30px;font-weight:700;line-height:1;
  color:var(--copper-600);
  background-image:linear-gradient(90deg,var(--copper-600),var(--amber));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.flow-item h3{font-size:18.5px;font-weight:600;color:var(--ink-900);line-height:1.5;}
.flow-item .flow-sub{margin-top:6px;font-size:13px;color:var(--ink-300);font-family:var(--mono);}
.flow-item p{font-size:14.8px;color:var(--ink-500);line-height:1.85;}
.flow-item ul{margin-top:10px;display:flex;flex-wrap:wrap;gap:8px;}
.flow-item ul li{
  font-size:12.5px;padding:4px 11px;border-radius:var(--r-pill);
  background:var(--paper);border:1px solid var(--line);color:var(--ink-500);
}

/* ============ 时间轴 ============ */
.tl{position:relative;padding-left:30px;}
.tl::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:1px;background:var(--line);}
.tl-item{position:relative;padding:0 0 32px 0;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-30px;top:8px;width:13px;height:13px;border-radius:50%;
  background:var(--surface);border:2px solid var(--copper-600);
}
.tl-item.is-now::before{background:var(--copper-600);box-shadow:0 0 0 4px var(--copper-050);}
.tl-date{font-family:var(--mono);font-size:12.5px;color:var(--copper-700);letter-spacing:.03em;}
.tl-item h3{margin-top:6px;font-size:17px;font-weight:600;color:var(--ink-900);}
.tl-item p{margin-top:6px;font-size:14.5px;color:var(--ink-500);line-height:1.85;}

/* ============ 认证网格 ============ */
.cert-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
.cert-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;display:flex;gap:18px;align-items:center;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.cert-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:#DCD5C9;}
.cert-card img{width:88px;height:88px;flex:0 0 88px;border-radius:12px;object-fit:cover;}
.cert-card h3{font-size:17px;font-weight:600;color:var(--ink-900);}
.cert-card p{margin-top:6px;font-size:14px;color:var(--ink-500);line-height:1.8;}
.cert-tag{
  display:inline-flex;align-items:center;gap:6px;margin-top:10px;
  font-size:12px;padding:3px 10px;border-radius:var(--r-pill);
  background:var(--signal-050);color:var(--signal-600);font-weight:600;font-family:var(--mono);
}
.cert-tag.gray{background:var(--paper);color:var(--ink-500);}

/* ============ 联系信息 ============ */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.contact-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:26px;
  box-shadow:var(--sh-1);
}
.contact-card h3{font-size:18.5px;font-weight:600;color:var(--ink-900);}
.contact-list{margin-top:16px;display:flex;flex-direction:column;}
.contact-list li{
  display:flex;gap:14px;padding:13px 0;border-bottom:1px dashed var(--line);font-size:14.5px;color:var(--ink-500);
}
.contact-list li:last-child{border-bottom:none;}
.contact-list b{flex:0 0 84px;color:var(--ink-900);font-weight:600;font-size:14px;}
.contact-list .mono{color:var(--ink-900);}
.map-box{
  border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);background:var(--surface);
  display:flex;flex-direction:column;
}
.map-box img{width:100%;aspect-ratio:16/9;object-fit:cover;}
.map-body{padding:20px 22px;}
.map-body h3{font-size:17px;font-weight:600;color:var(--ink-900);}
.map-body p{margin-top:8px;font-size:14px;color:var(--ink-500);line-height:1.85;}
.node-list{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px;}
.node-list li{
  font-size:12.5px;padding:5px 11px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:var(--paper);color:var(--ink-700);
}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 4px;font-size:16px;font-weight:600;color:var(--ink-900);
  transition:color .15s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--copper-700);}
.faq-item .sign{
  position:relative;width:20px;height:20px;flex:0 0 20px;
}
.faq-item .sign::before,.faq-item .sign::after{
  content:"";position:absolute;background:var(--copper-600);border-radius:2px;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.faq-item .sign::before{left:0;top:9px;width:20px;height:2px;}
.faq-item .sign::after{left:9px;top:0;width:2px;height:20px;}
.faq-item[open] .sign::after{transform:scaleY(0);opacity:0;}
.faq-a{padding:0 4px 22px;font-size:15px;color:var(--ink-500);line-height:1.9;max-width:860px;}

/* ============ CTA ============ */
.cta{
  background:var(--ink-900);border-radius:var(--r-img);padding:48px 48px;
  display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;color:#F5F3EF;position:relative;overflow:hidden;
}
.cta::before{
  content:"";position:absolute;inset:0;opacity:.16;
  background-image:url("/assets/images/backpic/back-3.webp");background-size:cover;background-position:center right;
}
.cta>*{position:relative;}
.cta h2{font-size:clamp(23px,2.4vw,30px);font-weight:700;color:#fff;letter-spacing:-.02em;line-height:1.35;}
.cta p{margin-top:12px;font-size:15px;color:#B8B2AA;max-width:520px;}
.cta-right{display:flex;flex-direction:column;align-items:flex-end;gap:18px;}
.cta-btns{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end;}
.qr-line{display:flex;align-items:center;gap:14px;}
.qr-box{
  width:96px;height:96px;border-radius:12px;background:#fff;padding:6px;flex:0 0 96px;
  display:flex;align-items:center;justify-content:center;
}
.qr-box img{width:100%;height:100%;object-fit:cover;border-radius:8px;}
.qr-line span{font-size:12.5px;color:#A9A29A;line-height:1.7;}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:#B8B2AA;margin-top:96px;padding:64px 0 26px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.footer-brand .brand-mark{width:36px;height:36px;flex:0 0 36px;border-radius:10px;}
.footer-brand strong{display:block;color:#fff;font-size:15.5px;line-height:1.3;}
.footer-brand em{display:block;font-style:normal;font-size:10.5px;letter-spacing:.14em;color:#7E7871;font-family:var(--mono);}
.footer-col p{font-size:14px;line-height:1.85;color:#9E978F;max-width:320px;}
.footer-col p.mono{margin-top:12px;font-size:12.5px;color:#7E7871;}
.footer-col h3{font-size:12.5px;letter-spacing:.12em;color:#7E7871;margin-bottom:16px;font-family:var(--mono);font-weight:600;}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col ul li{font-size:14px;color:#A9A29A;line-height:1.7;}
.footer-col ul a{transition:color .15s var(--ease);}
.footer-col ul a:hover{color:var(--amber);text-decoration:underline;text-underline-offset:3px;}
.footer-bottom{
  margin-top:48px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between;
  font-size:12.5px;color:#7E7871;
}

/* ============ 滚动进入 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease);}
.reveal.in{opacity:1;transform:none;}

/* ============ 断点 ============ */
@media (max-width:1439px){
  :root{--side-w:248px;}
}
@media (max-width:1199px){
  :root{--side-w:76px;}
  .sidebar{padding:20px 10px 16px;align-items:center;}
  .brand{justify-content:center;padding-bottom:16px;}
  .brand-txt,.side-txt,.side-title,.side-ver{display:none;}
  .side-link{justify-content:center;padding:0;}
  .side-dl{width:44px;height:44px;border-radius:12px;font-size:0;}
  .side-dl::after{content:"↓";font-size:16px;}
  .story{grid-template-columns:1fr;gap:40px;}
  .story-card{left:16px;bottom:16px;}
  .contact-wrap{grid-template-columns:1fr;}
}
@media (max-width:1023px){
  .sidebar{display:none;}
  .main{margin-left:0;}
  .topbar{display:flex;}
  .main-inner{padding:0 20px;}
  .section{padding:72px 0;}
  .page-head-in{padding:46px 30px 42px;}
  .metrics{grid-template-columns:repeat(2,1fr);gap:24px;padding:34px 28px;}
  .flow-item{grid-template-columns:64px 1fr;gap:18px;}
  .flow-item p{grid-column:2;}
  .cta{grid-template-columns:1fr;padding:38px 30px;}
  .cta-right{align-items:flex-start;}
  .cta-btns{justify-content:flex-start;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px;}
}
@media (max-width:767px){
  body{font-size:15.5px;}
  .main-inner{padding:0 16px;}
  .section{padding:56px 0;}
  .page-head-in{padding:36px 20px 34px;}
  .head-meta{gap:20px;margin-top:28px;}
  .head-meta div strong{font-size:17px;}
  .head-actions .btn{width:100%;}
  .metrics{grid-template-columns:1fr;padding:28px 22px;}
  .cert-grid{grid-template-columns:1fr;}
  .cert-card{flex-direction:column;align-items:flex-start;}
  .cert-card img{width:100%;height:150px;flex:none;}
  .flow-item{grid-template-columns:1fr;gap:10px;padding:24px 4px;}
  .flow-item p{grid-column:auto;}
  .cta{padding:32px 22px;}
  .cta-btns{flex-direction:column;width:100%;}
  .cta-btns .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:30px;}
  .site-footer{margin-top:56px;padding:48px 0 22px;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .btn{height:46px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important;}
  .reveal{opacity:1;transform:none;}
}