/* roulang page: index */
:root{
  --c-brand:#135E56;
  --c-brand-deep:#0C211F;
  --c-brand-soft:#E7F0EE;
  --c-accent:#F26A2E;
  --c-accent-hover:#D9591F;
  --c-accent-active:#C24E18;
  --c-gold:#C3A46A;
  --c-bg:#F5F6F2;
  --c-card:#FFFFFF;
  --c-dark:#0C211F;
  --c-ink:#111A18;
  --c-body:#3A4A46;
  --c-muted:#7C8A86;
  --c-invert:#EFF4F2;
  --c-line:#E4E8E3;
  --c-line-strong:#CFD6D1;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:24px;
  --sh-1:0 1px 2px rgba(12,33,31,.05),0 10px 28px -14px rgba(12,33,31,.10);
  --sh-2:0 2px 4px rgba(12,33,31,.06),0 20px 44px -18px rgba(12,33,31,.16);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-body);
  font-family:'PingFang SC','HarmonyOS Sans','Noto Sans SC','Microsoft YaHei',Inter,ui-sans-serif,system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
h1,h2,h3,h4{margin:0;color:var(--c-ink);font-weight:600;letter-spacing:-0.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px}
.container{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
@media (min-width:768px){.container{padding-left:32px;padding-right:32px}}
.section{padding-top:56px;padding-bottom:56px}
@media (min-width:768px){.section{padding-top:72px;padding-bottom:72px}}
@media (min-width:1024px){.section{padding-top:96px;padding-bottom:96px}}
.h1{font-size:31px;line-height:1.2;font-weight:700;letter-spacing:-0.01em}
@media (min-width:1024px){.h1{font-size:52px;line-height:1.18}}
.h2{font-size:26px;line-height:1.3;font-weight:600}
@media (min-width:1024px){.h2{font-size:34px;line-height:1.25}}
.h3{font-size:19px;line-height:1.4;font-weight:600}
.lead{font-size:16px;line-height:1.85;max-width:44em}
.divider{height:1px;background:var(--c-line);border:0}
.gold-rule{height:1px;background:linear-gradient(90deg,var(--c-gold),rgba(195,164,106,0))}
.topbar{background:var(--c-dark);color:rgba(239,244,242,.7);font-size:13px;height:36px;display:flex;align-items:center}
.topbar a{color:rgba(239,244,242,.86);transition:color .2s var(--ease)}
.topbar a:hover{color:#fff}
.topbar .sep{width:1px;height:14px;background:rgba(255,255,255,.16);display:inline-block}
.site-header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.92);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-bottom:1px solid transparent;transition:border-color .32s var(--ease),box-shadow .32s var(--ease)}
.site-header.is-scrolled{border-bottom-color:var(--c-line);box-shadow:0 1px 2px rgba(12,33,31,.04)}
.nav-inner{height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px}
@media (min-width:1024px){.nav-inner{height:64px}}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--c-ink);font-size:16px;letter-spacing:-0.01em}
.brand-mark{width:30px;height:30px;border-radius:9px;background:var(--c-brand);position:relative;flex:0 0 auto;display:grid;place-items:center}
.brand-mark::after{content:'';width:12px;height:12px;border-radius:3px;border:1.5px solid rgba(239,244,242,.9);border-right-color:transparent;border-bottom-color:transparent;transform:rotate(45deg) translate(-1px,1px)}
.nav-links{display:none;align-items:center;gap:26px}
@media (min-width:1024px){.nav-links{display:flex}}
.nav-link{position:relative;font-size:15px;color:var(--c-body);padding:6px 0;transition:color .2s var(--ease)}
.nav-link::after{content:'';position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--c-brand);transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease)}
.nav-link:hover{color:var(--c-ink)}
.nav-link.is-active{color:var(--c-ink);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:14px}
.nav-minor{display:none;font-size:14px;color:var(--c-brand);border-bottom:1px solid var(--c-brand);padding-bottom:1px;transition:border-width .2s var(--ease)}
@media (min-width:1024px){.nav-minor{display:inline-block}}
.nav-minor:hover{border-bottom-width:2px}
.burger{width:40px;height:40px;border:1px solid var(--c-line-strong);border-radius:var(--r-sm);display:grid;place-items:center;gap:4px}
@media (min-width:1024px){.burger{display:none}}
.burger span{display:block;width:16px;height:1.5px;background:var(--c-ink);transition:transform .32s var(--ease),opacity .2s var(--ease)}
.burger.is-open span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.drawer{position:fixed;inset:36px 0 0 0;background:#fff;z-index:55;transform:translateY(-100%);transition:transform .32s var(--ease);display:flex;flex-direction:column;padding:20px;overflow-y:auto}
.drawer.is-open{transform:translateY(0)}
.drawer nav{display:flex;flex-direction:column}
.drawer nav a{padding:16px 4px;border-bottom:1px solid var(--c-line);font-size:16px;color:var(--c-ink)}
.drawer nav a.is-active{font-weight:600;color:var(--c-brand)}
.drawer-foot{margin-top:auto;padding-top:20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;border-radius:var(--r-md);height:40px;padding:0 18px;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .32s var(--ease),box-shadow .2s var(--ease);white-space:nowrap}
.btn-lg{height:48px;padding:0 24px;font-size:16px}
.btn-primary{position:relative;overflow:hidden;background:var(--c-accent);color:#fff}
.btn-primary::before{content:'';position:absolute;top:0;bottom:0;left:-40%;width:40%;background:rgba(255,255,255,.14);transition:left .32s var(--ease)}
.btn-primary:hover::before{left:0}
.btn-primary:hover{background:var(--c-accent-hover)}
.btn-primary:active{background:var(--c-accent-active)}
.btn-primary .arrow{position:relative;transition:transform .2s var(--ease)}
.btn-primary:hover .arrow{transform:translateX(2px)}
.btn-secondary{background:#fff;color:var(--c-brand);border:1px solid var(--c-brand)}
.btn-secondary:hover{background:var(--c-brand-soft)}
.btn-secondary:active{background:#D8E6E3}
.btn-text{color:var(--c-brand);border-bottom:1px solid var(--c-brand);border-radius:0;padding:0 0 2px;height:auto;font-weight:500}
.btn-text:hover{border-bottom-width:2px}
.btn:disabled,.btn[disabled]{opacity:.4;cursor:not-allowed}
.tag{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-sm);background:var(--c-brand-soft);color:var(--c-brand);font-size:12px;font-weight:500;letter-spacing:.02em}
.tag-outline{background:transparent;border:1px solid var(--c-line-strong);color:var(--c-muted)}
.tag-gold{background:transparent;border:1px solid var(--c-gold);color:#8C7440}
.card{background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden;transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--c-line-strong)}
.card-media{overflow:hidden;aspect-ratio:16/10;background:var(--c-brand-soft)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .56s var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}
.clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.clamp-3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.clamp-5{display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden}
.hero-media{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--c-line);box-shadow:var(--sh-1)}
.float-card{position:absolute;left:-16px;bottom:24px;background:#fff;border:1px solid var(--c-gold);border-radius:var(--r-md);padding:12px 16px;box-shadow:var(--sh-1);max-width:230px}
.num-mark{font-size:34px;line-height:1;font-weight:300;color:var(--c-gold);letter-spacing:.02em}
@media (min-width:1024px){.num-mark{font-size:48px}}
.value-row{display:flex;gap:20px;padding:22px 0;border-top:1px solid var(--c-line)}
.spec{padding:20px 0;border-top:1px solid var(--c-line);transition:background .2s var(--ease)}
.spec:first-child{border-top:0}
.spec:hover{background:#FBFCFA}
@media (min-width:768px){.spec{padding:0 24px;height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}}
.masonry{column-count:1;column-gap:24px}
@media (min-width:768px){.masonry{column-count:2}}
@media (min-width:1024px){.masonry{column-count:3}}
.masonry .card{break-inside:avoid;margin-bottom:24px}
.stars{color:var(--c-gold);letter-spacing:2px;font-size:14px}
.faq-item{border-bottom:1px solid var(--c-line)}
.faq-item:first-child{border-top:0}
.faq-q{width:100%;display:flex;align-items:center;gap:16px;min-height:56px;padding:14px 0;text-align:left;font-size:16px;font-weight:600;color:var(--c-ink)}
.faq-q .idx{color:var(--c-gold);font-weight:300;font-size:14px;min-width:24px}
.faq-q .sign{margin-left:auto;width:18px;height:18px;position:relative;flex:0 0 auto;transition:transform .32s var(--ease)}
.faq-q .sign::before,.faq-q .sign::after{content:'';position:absolute;background:var(--c-brand);left:50%;top:50%}
.faq-q .sign::before{width:14px;height:1.5px;transform:translate(-50%,-50%)}
.faq-q .sign::after{width:1.5px;height:14px;transform:translate(-50%,-50%)}
.faq-item.is-open .sign{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .32s var(--ease)}
.faq-a-inner{padding:0 0 20px 40px;font-size:15px;color:var(--c-body)}
.shot-wrap{position:relative}
.shot-track{display:flex;gap:24px;transition:transform .56s var(--ease)}
.shot-track>*{flex:0 0 calc((100% - 48px)/3);min-width:0}
@media (max-width:1023px){.shot-track>*{flex:0 0 calc((100% - 24px)/2)}}
@media (max-width:767px){.shot-track>*{flex:0 0 82%}}
.shot-arrow{width:40px;height:40px;border:1px solid rgba(255,255,255,.28);border-radius:var(--r-sm);display:grid;place-items:center;color:rgba(239,244,242,.9);transition:background .2s var(--ease),border-color .2s var(--ease)}
.shot-arrow:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.5)}
.dots{display:flex;align-items:center;gap:8px;justify-content:center}
.dot{width:8px;height:3px;border-radius:2px;background:rgba(255,255,255,.28);transition:width .32s var(--ease),background .32s var(--ease)}
.dot.is-active{width:24px;background:var(--c-brand)}
.dark-panel{background:var(--c-dark);border-radius:var(--r-lg);border:1px solid rgba(255,255,255,.08)}
.section-dark{background:var(--c-dark);color:rgba(239,244,242,.78)}
.news-grid{display:grid;gap:24px}
@media (min-width:1024px){.news-grid{grid-template-columns:1.15fr 1fr}}
.compact-row{display:flex;gap:16px;padding:16px 0;border-top:1px solid var(--c-line);transition:padding-left .2s var(--ease)}
.compact-row:first-child{border-top:0;padding-top:0}
.compact-row:hover{padding-left:4px}
.compact-thumb{width:88px;height:60px;border-radius:var(--r-sm);overflow:hidden;flex:0 0 auto;background:var(--c-brand-soft)}
.compact-thumb img{width:100%;height:100%;object-fit:cover}
.qr-box{width:120px;height:120px;border:1px solid var(--c-line-strong);border-radius:var(--r-sm);background:#fff;display:grid;place-items:center;padding:10px}
.qr-box svg{width:100%;height:100%;display:block}
.mobile-download{position:fixed;left:0;right:0;bottom:0;z-index:70;height:60px;background:#fff;border-top:1px solid var(--c-line);box-shadow:0 -8px 24px -18px rgba(12,33,31,.4);display:flex;align-items:center;gap:12px;padding:0 16px;transform:translateY(110%);transition:transform .32s var(--ease)}
.mobile-download.is-visible{transform:translateY(0)}
@media (min-width:1024px){.mobile-download{display:none}}
.footer-link{color:rgba(239,244,242,.66);font-size:14px;transition:color .2s var(--ease)}
.footer-link:hover{color:#fff}
.reveal{opacity:0;transform:translateY(12px);transition:opacity .56s var(--ease),transform .56s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
.stat-num{font-variant-numeric:tabular-nums}
.warn-card{border-left:3px solid var(--c-gold);background:#fff;border-radius:0 var(--r-sm) var(--r-sm) 0;padding:16px 18px}
link, style, script{display:none}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
  .card:hover{transform:none}
}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--c-bg)}
::-webkit-scrollbar-thumb{background:var(--c-line-strong);border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:var(--c-muted)}

/* roulang page: article */
:root{
  --c-brand:#135E56;
  --c-brand-deep:#0C211F;
  --c-brand-soft:#E7F0EE;
  --c-accent:#F26A2E;
  --c-accent-hover:#D9591F;
  --c-accent-active:#C24E18;
  --c-gold:#C3A46A;
  --c-bg:#F5F6F2;
  --c-card:#FFFFFF;
  --c-dark:#0C211F;
  --c-ink:#111A18;
  --c-text:#3A4A46;
  --c-muted:#7C8A86;
  --c-invert:#EFF4F2;
  --c-line:#E4E8E3;
  --c-line-strong:#CFD6D1;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:24px;
  --sh-1:0 1px 2px rgba(12,33,31,.05), 0 10px 28px -14px rgba(12,33,31,.10);
  --sh-2:0 2px 4px rgba(12,33,31,.06), 0 20px 44px -18px rgba(12,33,31,.16);
  --ease:cubic-bezier(.2,.7,.3,1);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:"PingFang SC","HarmonyOS Sans","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
:focus{outline:none}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px;border-radius:4px}
::selection{background:var(--c-brand-soft);color:var(--c-ink)}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--c-dark);color:rgba(239,244,242,.7);font-size:13px}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:36px;flex-wrap:nowrap}
.topbar-left{display:flex;align-items:center;gap:12px;min-width:0}
.topbar-domain{color:rgba(239,244,242,.9);font-weight:600;letter-spacing:.02em;white-space:nowrap}
.topbar-tip{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:rgba(239,244,242,.65)}
.topbar-right{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.topbar-link{color:rgba(239,244,242,.9);text-decoration:none;transition:color .2s var(--ease)}
.topbar-link:hover{color:#fff}
.topbar-link-muted{color:rgba(239,244,242,.6)}
.topbar-sep{width:1px;height:12px;background:rgba(255,255,255,.16);display:inline-block}
@media(max-width:767px){
  .topbar-tip,.topbar-link-muted,.topbar-right .topbar-sep{display:none}
}

/* ---------- 主导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--c-line);box-shadow:0 1px 2px rgba(12,33,31,.04)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:56px}
@media(min-width:1024px){.nav-inner{height:64px}}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--c-ink);letter-spacing:-.01em;white-space:nowrap}
.brand-mark{position:relative;width:26px;height:26px;border-radius:8px;background:var(--c-brand);flex:0 0 auto}
.brand-mark::before{content:"";position:absolute;left:7px;top:8px;width:12px;height:2px;background:#fff;border-radius:2px}
.brand-mark::after{content:"";position:absolute;left:7px;top:14px;width:7px;height:2px;background:var(--c-gold);border-radius:2px}
.nav-links{display:none}
@media(min-width:1024px){.nav-links{display:flex;align-items:center;gap:28px}}
.nav-link{position:relative;font-size:15px;color:var(--c-text);padding:6px 0;transition:color .2s var(--ease)}
.nav-link:hover{color:var(--c-ink)}
.nav-link.is-active{color:var(--c-ink);font-weight:600}
.nav-link.is-active::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;border-radius:2px;background:var(--c-brand)}
.nav-actions{display:flex;align-items:center;gap:16px}
.nav-minor{display:none;font-size:14px;color:var(--c-brand);border-bottom:1px solid currentColor;padding-bottom:2px}
.nav-minor:hover{border-bottom-width:2px}
@media(min-width:1024px){.nav-minor{display:inline-block}}
.burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;padding:0 9px;background:#fff;border:1px solid var(--c-line);border-radius:var(--r-sm)}
.burger span{display:block;height:2px;background:var(--c-ink);border-radius:2px;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(min-width:1024px){.burger{display:none}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:40px;padding:0 20px;border-radius:var(--r-md);
  font-size:15px;font-weight:600;line-height:1;letter-spacing:.01em;
  border:1px solid transparent;background:transparent;cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn-lg{height:48px;padding:0 26px;font-size:16px}
.btn-primary{background:var(--c-accent);color:#fff}
.btn-primary:hover{background:var(--c-accent-hover)}
.btn-primary:active{background:var(--c-accent-active)}
.btn-secondary{background:#fff;border-color:var(--c-brand);color:var(--c-brand)}
.btn-secondary:hover{background:var(--c-brand-soft)}
.btn-secondary:active{background:#D8E7E4}
.btn-text{height:auto;padding:0 0 3px;color:var(--c-brand);border-bottom:1px solid currentColor;border-radius:0;font-size:14px}
.btn-text:hover{border-bottom-width:2px}
.btn[disabled],.btn.is-disabled{opacity:.4;cursor:not-allowed;pointer-events:none}
.arrow{display:inline-block;transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(2px)}

/* ---------- 文章头部 ---------- */
.article-head{padding:40px 0 26px;border-bottom:1px solid var(--c-line)}
.crumbs{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--c-muted)}
.crumb-link{color:var(--c-muted);transition:color .2s var(--ease)}
.crumb-link:hover{color:var(--c-brand)}
.crumb-sep{color:var(--c-line-strong)}
.crumb-current{color:var(--c-text)}
.article-title{
  margin-top:20px;font-size:30px;line-height:1.22;font-weight:700;color:var(--c-ink);
  letter-spacing:-.01em;max-width:20em;
}
@media(min-width:768px){.article-title{font-size:34px}}
@media(min-width:1024px){.article-title{font-size:40px}}
.article-meta{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:18px;font-size:13px;color:var(--c-muted)}
.meta-dot{width:4px;height:4px;border-radius:50%;background:var(--c-line-strong)}
.tag{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-sm);
  background:var(--c-brand-soft);color:var(--c-brand);font-size:12px;font-weight:500;letter-spacing:.02em;
}
.tag-outline{background:#fff;border:1px solid var(--c-line-strong);color:var(--c-text)}

/* ---------- 正文 ---------- */
.article-shell{padding:48px 0 72px}
.article-body{max-width:740px;margin:0 auto;font-size:16px;line-height:1.9;color:var(--c-text)}
@media(min-width:768px){.article-body{font-size:17px}}
.article-body p{margin:0 0 1.4em}
.article-body > p:first-of-type{font-size:17px;color:var(--c-ink);line-height:1.9}
@media(min-width:768px){.article-body > p:first-of-type{font-size:17.5px}}
.article-body h2{
  position:relative;margin:2.2em 0 .8em;padding-left:14px;
  font-size:24px;line-height:1.35;font-weight:600;color:var(--c-ink);
}
@media(min-width:768px){.article-body h2{font-size:27px}}
.article-body h2::before{content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:3px;border-radius:2px;background:var(--c-brand)}
.article-body h3{margin:1.8em 0 .6em;font-size:20px;line-height:1.4;font-weight:600;color:var(--c-ink)}
.article-body h4{margin:1.5em 0 .5em;font-size:17px;font-weight:600;color:var(--c-ink)}
.article-body ul,.article-body ol{margin:0 0 1.4em;padding-left:1.35em}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin:.5em 0;line-height:1.85}
.article-body li::marker{color:var(--c-brand)}
.article-body blockquote{
  margin:1.6em 0;padding:16px 20px;font-style:normal;color:var(--c-ink);
  background:var(--c-brand-soft);border-left:3px solid var(--c-brand);
  border-radius:0 var(--r-sm) var(--r-sm) 0;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--r-md);margin:1.6em 0;height:auto}
.article-body figure{margin:1.8em 0}
.article-body figcaption{margin-top:10px;font-size:13px;line-height:1.7;color:var(--c-muted);text-align:center}
.article-body a{color:var(--c-brand);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.article-body a:hover{text-decoration-thickness:2px}
.article-body code{
  padding:2px 6px;border-radius:6px;background:#F0F2EF;border:1px solid var(--c-line);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  font-size:13px;color:var(--c-ink);
}
.article-body pre{
  margin:1.6em 0;padding:16px 18px;overflow-x:auto;
  background:#F0F2EF;border:1px solid var(--c-line);border-radius:var(--r-sm);
  font-size:13px;line-height:1.7;
}
.article-body pre code{padding:0;border:0;background:none;font-size:13px}
.article-body table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:15px}
.article-body th,.article-body td{padding:12px 14px;border-bottom:1px solid var(--c-line);text-align:left;vertical-align:top}
.article-body thead th{background:var(--c-brand-soft);color:var(--c-ink);font-weight:600;border-bottom:1px solid var(--c-line-strong)}
.article-body hr{margin:2.2em 0;border:0;border-top:1px solid var(--c-line)}

/* ---------- 空态 ---------- */
.empty-state{
  max-width:640px;margin:0 auto;padding:56px 28px;text-align:center;
  background:#fff;border:1px solid var(--c-line);border-radius:var(--r-lg);box-shadow:var(--sh-1);
}
.empty-ico{
  width:48px;height:48px;margin:0 auto 18px;border-radius:var(--r-md);
  background:var(--c-brand-soft);color:var(--c-brand);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;
}
.empty-state h2{font-size:20px;font-weight:600;color:var(--c-ink)}
.empty-state p{margin-top:10px;font-size:15px;color:var(--c-muted)}
.empty-state .btn{margin-top:22px}

/* ---------- 文末工具行 ---------- */
.article-foot{max-width:740px;margin:0 auto;padding-top:26px;border-top:1px solid var(--c-line)}
.foot-tags{display:flex;flex-wrap:wrap;gap:8px}
.foot-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px;margin-top:18px}

/* ---------- 规格条 ---------- */
.section{padding:56px 0}
@media(min-width:768px){.section{padding:72px 0}}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:28px}
.section-title{font-size:26px;line-height:1.3;font-weight:600;color:var(--c-ink);letter-spacing:-.01em}
@media(min-width:768px){.section-title{font-size:30px}}
.section-sub{margin-top:8px;font-size:15px;color:var(--c-muted);max-width:56em}
.spec-list{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden}
.spec-row{
  display:grid;grid-template-columns:1fr;gap:12px;
  padding:18px 20px;border-bottom:1px solid var(--c-line);align-items:center;
}
.spec-row:last-child{border-bottom:0}
@media(min-width:768px){
  .spec-row{grid-template-columns:170px 1fr auto;gap:24px;padding:0 24px;min-height:72px}
}
.spec-platform{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600;color:var(--c-ink)}
.spec-ico{
  width:28px;height:28px;border-radius:var(--r-sm);background:var(--c-brand-soft);color:var(--c-brand);
  display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex:0 0 auto;
}
.spec-detail{display:flex;flex-wrap:wrap;gap:8px 22px;font-size:14px;color:var(--c-text)}
.spec-btn{justify-self:start}

/* ---------- 卡片 ---------- */
.card-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:768px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr)}}
.post-card{
  display:flex;flex-direction:column;overflow:hidden;
  background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);
  transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease);
}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--c-line-strong)}
.post-media{aspect-ratio:16/10;overflow:hidden;background:var(--c-brand-soft)}
.post-media img{width:100%;height:100%;object-fit:cover;transition:transform .32s var(--ease)}
.post-card:hover .post-media img{transform:scale(1.03)}
.post-body{padding:18px 20px 0;flex:1 1 auto}
.post-title{
  margin-top:10px;font-size:17px;line-height:1.45;font-weight:600;color:var(--c-ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.post-excerpt{
  margin-top:8px;font-size:14px;line-height:1.7;color:var(--c-muted);
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.post-foot{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:16px;padding:14px 20px;border-top:1px solid var(--c-line);
  font-size:13px;color:var(--c-muted);
}
.post-more{color:var(--c-brand);font-weight:500}
.post-card:hover .post-more .arrow{transform:translateX(2px)}

/* ---------- CTA 深色条 ---------- */
.cta-band{
  background:var(--c-dark);border-radius:var(--r-lg);padding:28px 24px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;
}
@media(min-width:768px){.cta-band{padding:34px 40px}}
.cta-band h2{font-size:22px;line-height:1.4;font-weight:600;color:var(--c-invert)}
@media(min-width:768px){.cta-band h2{font-size:26px}}
.cta-band p{margin-top:8px;font-size:14px;color:rgba(239,244,242,.66)}

/* ---------- 返回列表浮标 ---------- */
.back-list{
  position:fixed;right:20px;top:50%;z-index:50;
  display:none;align-items:center;gap:6px;
  padding:10px 14px;border-radius:var(--r-md);
  background:#fff;border:1px solid var(--c-line-strong);color:var(--c-brand);
  font-size:13px;font-weight:600;box-shadow:var(--sh-1);
  opacity:0;transform:translateY(-50%) translateX(14px);pointer-events:none;
  transition:opacity .32s var(--ease),transform .32s var(--ease),background-color .2s var(--ease);
}
@media(min-width:1024px){.back-list{display:inline-flex}}
.back-list.is-visible{opacity:1;transform:translateY(-50%) translateX(0);pointer-events:auto}
.back-list:hover{background:var(--c-brand-soft)}

/* ---------- 移动端抽屉 ---------- */
.drawer-mask{
  position:fixed;inset:0;background:rgba(12,33,31,.4);z-index:80;
  opacity:0;pointer-events:none;transition:opacity .32s var(--ease);
}
.drawer-mask.is-open{opacity:1;pointer-events:auto}
.drawer{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:#fff;padding:20px;
  transform:translateY(-100%);transition:transform .32s var(--ease);
  border-bottom-left-radius:var(--r-lg);border-bottom-right-radius:var(--r-lg);
  max-height:88vh;overflow-y:auto;
}
.drawer.is-open{transform:translateY(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:16px;border-bottom:1px solid var(--c-line)}
.drawer-close{width:36px;height:36px;border-radius:var(--r-sm);border:1px solid var(--c-line);background:#fff;color:var(--c-ink);font-size:16px;line-height:1}
.drawer-links{display:flex;flex-direction:column;margin-top:8px}
.drawer-link{padding:15px 0;border-bottom:1px solid var(--c-line);font-size:16px;color:var(--c-text)}
.drawer-link.is-active{color:var(--c-brand);font-weight:600}
.drawer-cta{margin-top:20px;width:100%}

/* ---------- 页脚 ---------- */
.footer-link{color:rgba(239,244,242,.68);font-size:14px;transition:color .2s var(--ease)}
.footer-link:hover{color:var(--c-invert)}
footer .brand{color:var(--c-invert)}

/* ---------- 移动端悬浮下载条 ---------- */
.mobile-download{
  position:fixed;left:0;right:0;bottom:0;z-index:70;height:60px;
  display:none;align-items:center;gap:12px;padding:0 16px;
  background:#fff;border-top:1px solid var(--c-line);
  box-shadow:0 -6px 20px -14px rgba(12,33,31,.3);
  transform:translateY(100%);transition:transform .32s var(--ease);
}
@media(max-width:767px){.mobile-download{display:flex}}
@media(min-width:768px){body.has-mobile-bar{padding-bottom:0}}
.mobile-download.is-visible{transform:translateY(0)}
body.has-mobile-bar{padding-bottom:72px}

/* ---------- 动效降级 ---------- */
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .post-card:hover{transform:none}
  .post-card:hover .post-media img{transform:none}
}

/* roulang page: category1 */
:root{
  --c-brand:#135E56;
  --c-brand-deep:#0C211F;
  --c-brand-soft:#E7F0EE;
  --c-accent:#F26A2E;
  --c-accent-hover:#D9591F;
  --c-accent-active:#C24E18;
  --c-gold:#C3A46A;
  --c-bg:#F5F6F2;
  --c-card:#FFFFFF;
  --c-dark:#0C211F;
  --c-ink:#111A18;
  --c-body:#3A4A46;
  --c-muted:#7C8A86;
  --c-invert:#EFF4F2;
  --c-line:#E4E8E3;
  --c-line-strong:#CFD6D1;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:24px;
  --shadow-1:0 1px 2px rgba(12,33,31,.05),0 10px 28px -14px rgba(12,33,31,.10);
  --shadow-2:0 2px 4px rgba(12,33,31,.06),0 20px 44px -18px rgba(12,33,31,.16);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-sans:"PingFang SC","HarmonyOS Sans","Noto Sans SC","Microsoft YaHei",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-body);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px;border-radius:6px}
::selection{background:var(--c-brand-soft);color:var(--c-brand-deep)}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}

/* ---------- 顶部信息条 ---------- */
.top-bar{height:36px;background:var(--c-brand-deep);color:rgba(239,244,242,.7);font-size:13px}
.top-bar-inner{display:flex;align-items:center;justify-content:space-between;height:36px;gap:16px}
.top-bar-left,.top-bar-right{display:flex;align-items:center;gap:12px;min-width:0}
.top-bar-domain{color:var(--c-invert);font-weight:600;letter-spacing:.02em}
.top-bar-tip{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:rgba(239,244,242,.62)}
.top-bar-sep{width:1px;height:12px;background:rgba(255,255,255,.18);flex:0 0 auto}
.top-link{color:rgba(239,244,242,.78);transition:color .2s var(--ease)}
.top-link:hover{color:var(--c-invert)}
.top-link.top-link-main{color:var(--c-invert);font-weight:500}
@media (max-width:767px){
  .top-bar-tip,.top-bar-sep{display:none}
  .top-bar-right .top-link:not(.top-link-main){display:none}
}

/* ---------- 主导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color .32s var(--ease),box-shadow .32s var(--ease),background-color .32s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--c-line);box-shadow:0 1px 2px rgba(12,33,31,.04)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:64px}
@media (max-width:767px){.nav-inner{height:56px}}

.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--c-ink);letter-spacing:-.01em;white-space:nowrap}
.brand-mark{position:relative;width:26px;height:26px;flex:0 0 26px;border-radius:8px;background:var(--c-brand)}
.brand-mark::before{content:"";position:absolute;left:6px;top:6px;width:14px;height:14px;border-radius:50%;border:2px solid rgba(239,244,242,.85);border-right-color:transparent;border-bottom-color:transparent;transform:rotate(-45deg)}
.brand-mark::after{content:"";position:absolute;right:5px;bottom:5px;width:6px;height:6px;border-radius:2px;background:var(--c-gold)}

.nav-links{display:none;align-items:center;gap:28px}
.nav-link{position:relative;font-size:15px;color:var(--c-body);padding:20px 0;transition:color .2s var(--ease)}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:10px;height:2px;background:var(--c-brand);transform:scaleX(0);transform-origin:left center;transition:transform .28s var(--ease),opacity .28s var(--ease)}
.nav-link:hover{color:var(--c-ink)}
.nav-link:hover::after{transform:scaleX(1);opacity:.45}
.nav-link.is-active{color:var(--c-ink);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1);opacity:1}

.nav-actions{display:flex;align-items:center;gap:16px}
.nav-minor{display:none;font-size:14px;color:var(--c-brand);border-bottom:1px solid transparent;padding-bottom:2px;transition:border-color .2s var(--ease)}
.nav-minor:hover{border-bottom-color:var(--c-brand)}

.burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;padding:0 8px;border-radius:var(--r-sm);border:1px solid var(--c-line)}
.burger span{display:block;height:2px;background:var(--c-ink);border-radius:2px;transition:transform .32s var(--ease),opacity .2s var(--ease)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media (min-width:1024px){
  .nav-links{display:flex}
  .nav-minor{display:inline-block}
  .burger{display:none}
}

/* ---------- 移动抽屉 ---------- */
.drawer{
  position:fixed;left:0;right:0;top:0;z-index:55;
  background:#fff;
  border-bottom:1px solid var(--c-line);
  box-shadow:var(--shadow-2);
  transform:translateY(-102%);
  transition:transform .32s var(--ease);
  padding-top:56px;
  max-height:100vh;overflow-y:auto;
}
.drawer.is-open{transform:translateY(0)}
.drawer-nav{display:flex;flex-direction:column;padding-top:12px;padding-bottom:8px}
.drawer-link{display:flex;align-items:center;justify-content:space-between;min-height:52px;border-bottom:1px solid var(--c-line);font-size:16px;color:var(--c-ink)}
.drawer-link.is-active{color:var(--c-brand);font-weight:600}
.drawer-link .dot{width:6px;height:6px;border-radius:50%;background:var(--c-gold);opacity:0;transition:opacity .2s var(--ease)}
.drawer-link.is-active .dot{opacity:1}
.drawer-foot{padding-top:16px;padding-bottom:24px}
body.nav-open{overflow:hidden}
@media (min-width:1024px){.drawer{display:none}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 18px;border-radius:var(--r-md);
  font-size:14.5px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;white-space:nowrap;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .32s var(--ease),box-shadow .32s var(--ease);
}
.btn-lg{height:48px;padding:0 26px;font-size:15.5px}
.btn-primary{background:var(--c-accent);color:#fff}
.btn-primary:hover{background:var(--c-accent-hover)}
.btn-primary:active{background:var(--c-accent-active)}
.btn-outline{background:#fff;color:var(--c-brand);border-color:var(--c-brand)}
.btn-outline:hover{background:var(--c-brand-soft)}
.btn-outline:active{background:#DAE6E3}
.btn-outline-light{background:transparent;color:var(--c-invert);border-color:rgba(255,255,255,.36)}
.btn-outline-light:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.6)}
.btn-text{height:auto;padding:0;color:var(--c-brand);border-bottom:1px solid var(--c-brand);border-radius:0}
.btn-text:hover{border-bottom-width:2px}
.btn .arrow{transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(2px)}
.btn[disabled],.btn.is-disabled{opacity:.4;cursor:not-allowed;pointer-events:none}

/* ---------- 通用区块 ---------- */
.section{padding:56px 0}
@media (min-width:768px){.section{padding:76px 0}}
@media (min-width:1024px){.section{padding:96px 0}}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12.5px;font-weight:500;letter-spacing:.08em;color:var(--c-brand)}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--c-gold)}

.section-title{font-size:clamp(26px,3.2vw,34px);line-height:1.25;font-weight:600;color:var(--c-ink);letter-spacing:-.01em}
.section-desc{margin-top:14px;max-width:40em;font-size:15.5px;color:var(--c-muted);line-height:1.8}
.hairline{height:1px;background:var(--c-line);border:0;margin:0}

/* ---------- Hero 窄条 ---------- */
.hero-band{position:relative;overflow:hidden;background:var(--c-brand-deep)}
.hero-band-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55}
.hero-band-mask{position:absolute;inset:0;background:linear-gradient(95deg,rgba(12,33,31,.94) 0%,rgba(12,33,31,.82) 46%,rgba(12,33,31,.52) 100%)}
.hero-band-inner{position:relative;z-index:2;min-height:280px;display:flex;flex-direction:column;justify-content:center;padding:56px 0 48px;color:var(--c-invert)}
@media (min-width:768px){.hero-band-inner{padding:64px 0 56px}}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:rgba(239,244,242,.7);margin-bottom:18px}
.breadcrumb a{color:rgba(239,244,242,.7);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--c-invert)}
.breadcrumb .sp{color:rgba(239,244,242,.36)}
.hero-band h1{font-size:clamp(28px,4.2vw,44px);line-height:1.2;font-weight:700;letter-spacing:-.01em;color:var(--c-invert);max-width:24em}
.hero-lead{margin-top:18px;max-width:46em;font-size:15.5px;line-height:1.9;color:rgba(239,244,242,.8)}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.hero-tag{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-sm);border:1px solid rgba(255,255,255,.24);font-size:12px;font-weight:500;letter-spacing:.02em;color:rgba(239,244,242,.86)}

/* ---------- 图文交替 ---------- */
.feature-row{display:grid;grid-template-columns:1fr;gap:28px;align-items:center}
@media (min-width:1024px){
  .feature-row{grid-template-columns:repeat(12,minmax(0,1fr));gap:64px}
  .fr-media{grid-column:span 6}
  .fr-body{grid-column:span 6}
  .feature-row.reverse .fr-media{order:2}
  .feature-row.reverse .fr-body{order:1}
}
.fr-media{position:relative}
.figure-frame{position:relative;overflow:hidden;border-radius:var(--r-lg);border:1px solid var(--c-line);box-shadow:var(--shadow-1);aspect-ratio:4/3;background:var(--c-brand-soft)}
.figure-frame img{width:100%;height:100%;object-fit:cover;transition:transform .56s var(--ease)}
.figure-frame:hover img{transform:scale(1.03)}
.figure-index{
  position:absolute;left:0;bottom:0;z-index:3;
  display:inline-flex;align-items:center;justify-content:center;
  min-width:64px;height:44px;padding:0 16px;
  background:var(--c-brand-deep);color:var(--c-gold);
  font-size:22px;font-weight:300;letter-spacing:.08em;
  border-top-right-radius:var(--r-md);
}
.feature-title{font-size:22px;line-height:1.4;font-weight:600;color:var(--c-ink);margin-top:16px}
.feature-text{margin-top:14px;font-size:15.5px;line-height:1.9;color:var(--c-body);max-width:34em}
.feature-list{margin-top:18px;display:flex;flex-direction:column;gap:10px}
.feature-list li{position:relative;padding-left:18px;font-size:14.5px;color:var(--c-muted);line-height:1.75}
.feature-list li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;border-radius:2px;background:var(--c-gold)}
.feature-divider{height:1px;background:var(--c-line);margin:48px 0;border:0}
@media (min-width:1024px){.feature-divider{margin:72px 0}}

/* ---------- 功能要点清单 ---------- */
.fact-grid{display:grid;grid-template-columns:1fr;gap:0}
@media (min-width:768px){.fact-grid{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:48px}}
.fact-item{display:flex;gap:12px;padding:20px 0;border-top:1px solid var(--c-line)}
.fact-item .tick{
  flex:0 0 20px;width:20px;height:20px;margin-top:5px;border-radius:6px;
  background:var(--c-brand-soft);color:var(--c-brand);
  display:inline-flex;align-items:center;justify-content:center;
}
.fact-item .tick svg{width:12px;height:12px}
.fact-item h3{font-size:17px;line-height:1.45;font-weight:600;color:var(--c-ink)}
.fact-item p{margin-top:6px;font-size:14px;line-height:1.75;color:var(--c-muted)}

/* ---------- 适用场景 ---------- */
.scene-wrap{display:grid;grid-template-columns:1fr;gap:28px}
@media (min-width:1024px){.scene-wrap{grid-template-columns:repeat(12,minmax(0,1fr));gap:64px}.scene-head{grid-column:span 4}.scene-list{grid-column:span 8}}
.scene-row{display:grid;grid-template-columns:1fr;gap:6px;padding:20px 0;border-top:1px solid var(--c-line)}
.scene-row:last-child{border-bottom:1px solid var(--c-line)}
@media (min-width:768px){.scene-row{grid-template-columns:180px 1fr;gap:24px;align-items:baseline}}
.scene-key{font-size:16px;font-weight:600;color:var(--c-ink)}
.scene-desc{font-size:14.5px;line-height:1.8;color:var(--c-muted)}

/* ---------- 数据条 ---------- */
.stat-band{background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--r-lg);padding:28px}
.stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
@media (min-width:1024px){.stat-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
.stat-cell{border-left:1px solid var(--c-line);padding-left:18px}
.stat-cell:first-child{border-left:0;padding-left:0}
@media (max-width:1023px){.stat-cell:nth-child(odd){border-left:0;padding-left:0}}
.stat-num{font-size:32px;font-weight:700;color:var(--c-brand);letter-spacing:-.02em;line-height:1.2}
.stat-label{margin-top:4px;font-size:13.5px;color:var(--c-muted)}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--c-line-strong);border-bottom:1px solid var(--c-line-strong)}
.faq-item{border-bottom:1px solid var(--c-line)}
.faq-item:last-child{border-bottom:0}
.faq-q{display:flex;align-items:center;gap:16px;width:100%;min-height:56px;padding:16px 0;text-align:left;font-size:17px;font-weight:600;color:var(--c-ink);line-height:1.5}
.faq-idx{flex:0 0 auto;font-size:13px;font-weight:400;letter-spacing:.08em;color:var(--c-gold)}
.faq-icon{position:relative;margin-left:auto;flex:0 0 18px;width:18px;height:18px;transition:transform .32s var(--ease)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--c-brand);border-radius:2px}
.faq-icon::before{left:0;top:8px;width:18px;height:2px}
.faq-icon::after{left:8px;top:0;width:2px;height:18px}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .32s var(--ease)}
.faq-a-inner{padding:0 0 22px 34px;max-width:46em;font-size:15px;line-height:1.9;color:var(--c-muted)}

/* ---------- CTA 条 ---------- */
.cta-band{background:var(--c-brand-deep);border-radius:var(--r-lg);padding:36px 24px;color:var(--c-invert)}
@media (min-width:768px){.cta-band{padding:48px 48px}}
.cta-inner{display:flex;flex-direction:column;gap:24px;align-items:flex-start}
@media (min-width:768px){.cta-inner{flex-direction:row;align-items:center;justify-content:space-between;gap:40px}}
.cta-title{font-size:clamp(20px,2.4vw,26px);font-weight:600;line-height:1.4;color:var(--c-invert)}
.cta-sub{margin-top:8px;font-size:14.5px;color:rgba(239,244,242,.68);max-width:36em}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--c-dark);margin-top:40px;padding:56px 0 24px}
.footer-brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--c-invert)}
.site-footer .brand-mark{background:var(--c-brand)}
.site-footer h4{color:var(--c-invert);font-size:15px;font-weight:600}
.footer-link{color:rgba(239,244,242,.68);font-size:14px;transition:color .2s var(--ease)}
.footer-link:hover{color:var(--c-invert)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08)}

/* ---------- 悬浮下载条 ---------- */
.float-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:70;
  background:#fff;border-top:1px solid var(--c-line);
  box-shadow:0 -10px 28px -18px rgba(12,33,31,.28);
  transform:translateY(110%);opacity:0;
  transition:transform .32s var(--ease),opacity .32s var(--ease);
  padding:8px 0;
  padding-bottom:calc(8px + env(safe-area-inset-bottom,0px));
}
.float-bar.is-visible{transform:translateY(0);opacity:1}
.float-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.float-text{font-size:13px;color:var(--c-muted);line-height:1.5}
.float-text strong{display:block;font-size:14.5px;color:var(--c-ink);font-weight:600}
.float-qr{width:44px;height:44px;border:1px solid var(--c-line);border-radius:var(--r-sm);flex:0 0 44px;display:flex;align-items:center;justify-content:center;color:var(--c-brand);font-size:11px;text-align:center;line-height:1.2}
@media (max-width:519px){.float-text{display:none}}

/* ---------- 动效 ---------- */
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.fx{opacity:0;animation:fadeUp .56s var(--ease) forwards}
.fx-1{animation-delay:.08s}
.fx-2{animation-delay:.16s}
.fx-3{animation-delay:.24s}
.fx-4{animation-delay:.32s}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-delay:0ms !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .fx{opacity:1;transform:none;animation:none}
}

/* roulang page: category2 */
:root{
  --c-brand:#135E56;
  --c-brand-deep:#0C211F;
  --c-brand-soft:#E7F0EE;
  --c-accent:#F26A2E;
  --c-accent-hover:#D9591F;
  --c-accent-active:#C24E18;
  --c-gold:#C3A46A;
  --c-bg:#F5F6F2;
  --c-card:#FFFFFF;
  --c-dark:#0C211F;
  --c-ink:#111A18;
  --c-text:#3A4A46;
  --c-muted:#7C8A86;
  --c-invert:#EFF4F2;
  --c-line:#E4E8E3;
  --c-line-strong:#CFD6D1;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:24px;
  --sh-1:0 1px 2px rgba(12,33,31,.05), 0 10px 28px -14px rgba(12,33,31,.10);
  --sh-2:0 2px 4px rgba(12,33,31,.06), 0 20px 44px -18px rgba(12,33,31,.16);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:"PingFang SC","HarmonyOS Sans","Noto Sans SC","Microsoft YaHei",ui-sans-serif,system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
a{color:var(--c-brand);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--c-accent)}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}

/* ============ 顶部信息条 ============ */
.topbar{background:var(--c-dark);color:rgba(239,244,242,.7);font-size:13px;height:36px;display:flex;align-items:center}
.topbar .container{display:flex;align-items:center;justify-content:space-between;gap:16px}
.topbar-left{display:flex;align-items:center;gap:10px;min-width:0}
.topbar-domain{color:var(--c-invert);font-weight:600;letter-spacing:.02em}
.topbar-sep{width:1px;height:12px;background:rgba(255,255,255,.16)}
.topbar-hint{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-right{display:flex;align-items:center;gap:14px;white-space:nowrap}
.topbar-right a{color:rgba(239,244,242,.78)}
.topbar-right a:hover{color:#fff}
.topbar-divider{width:1px;height:12px;background:rgba(255,255,255,.16)}
@media (max-width:767px){
  .topbar-hint,.topbar-minor,.topbar-divider{display:none}
}

/* ============ 主导航 ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color .32s var(--ease), box-shadow .32s var(--ease), background .32s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--c-line);box-shadow:0 6px 20px -18px rgba(12,33,31,.4)}
.nav-inner{height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--c-ink);font-weight:700;font-size:17px;letter-spacing:-.01em}
.brand:hover{color:var(--c-ink)}
.brand-mark{
  width:26px;height:26px;border-radius:8px;flex:0 0 26px;
  background:var(--c-brand);
  position:relative;
}
.brand-mark::after{
  content:"";position:absolute;inset:7px 7px auto auto;width:9px;height:9px;border-radius:2px;
  background:var(--c-gold);
}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-link{
  position:relative;color:var(--c-text);font-size:15px;padding:6px 0;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-19px;height:2px;background:var(--c-brand);
  transform:scaleX(0);transform-origin:left;transition:transform .32s var(--ease);
}
.nav-link:hover{color:var(--c-brand)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--c-ink);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:18px}
.nav-minor{font-size:14px;color:var(--c-muted)}
.nav-minor:hover{color:var(--c-brand)}
.burger{display:none;width:40px;height:40px;border:1px solid var(--c-line);border-radius:var(--r-sm);position:relative}
.burger span{
  position:absolute;left:11px;right:11px;height:1.5px;background:var(--c-ink);border-radius:2px;
  transition:transform .3s var(--ease), opacity .2s var(--ease);
}
.burger span:nth-child(1){top:14px}
.burger span:nth-child(2){top:19.5px}
.burger span:nth-child(3){top:25px}
.burger.is-open span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
@media (max-width:1023px){
  .nav-links{display:none}
  .nav-minor{display:none}
  .burger{display:block}
  .nav-inner{height:56px}
}
/* 抽屉 */
.drawer{
  position:fixed;inset:0;z-index:70;background:#fff;
  transform:translateY(-100%);transition:transform .32s var(--ease);
  display:flex;flex-direction:column;padding:20px;
  overflow-y:auto;
}
.drawer.is-open{transform:translateY(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}
.drawer-close{width:40px;height:40px;border:1px solid var(--c-line);border-radius:var(--r-sm);font-size:18px;color:var(--c-ink);line-height:1}
.drawer-nav a{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 2px;border-bottom:1px solid var(--c-line);
  color:var(--c-ink);font-size:17px;font-weight:500;
}
.drawer-nav a.is-active{color:var(--c-brand);font-weight:600}
.drawer-foot{margin-top:auto;padding-top:28px}
body.is-locked{overflow:hidden}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 20px;border-radius:var(--r-md);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;cursor:pointer;
  transition:background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .32s var(--ease), box-shadow .32s var(--ease);
}
.btn .arrow{transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(2px)}
.btn-lg{height:48px;padding:0 26px;font-size:16px}
.btn-sm{height:34px;padding:0 14px;font-size:14px;border-radius:var(--r-sm)}
.btn-primary{background:var(--c-accent);color:#fff}
.btn-primary:hover{background:var(--c-accent-hover);color:#fff}
.btn-primary:active{background:var(--c-accent-active)}
.btn-secondary{background:#fff;border-color:var(--c-brand);color:var(--c-brand)}
.btn-secondary:hover{background:var(--c-brand-soft);color:var(--c-brand)}
.btn-ghost{background:#fff;border-color:var(--c-line-strong);color:var(--c-text)}
.btn-ghost:hover{border-color:var(--c-brand);color:var(--c-brand)}
.btn-text{height:auto;padding:0;color:var(--c-brand);font-weight:600;border-bottom:1px solid var(--c-brand);border-radius:0}
.btn-text:hover{color:var(--c-brand);border-bottom-width:2px}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.4;cursor:not-allowed}
.btn-dark{background:transparent;border-color:rgba(255,255,255,.32);color:var(--c-invert)}
.btn-dark:hover{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.5)}

/* ============ 徽章 / 标签 ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  height:24px;padding:0 10px;border-radius:var(--r-sm);
  font-size:12px;font-weight:500;letter-spacing:.02em;
  background:var(--c-brand-soft);color:var(--c-brand);border:1px solid transparent;
}
.badge-outline{background:#fff;border-color:var(--c-line-strong);color:var(--c-muted)}
.badge-gold{background:rgba(195,164,106,.12);color:#8a7040;border-color:rgba(195,164,106,.4)}

/* ============ 区块 ============ */
.section{padding:96px 0}
.section-tight{padding:64px 0}
.section-head{margin-bottom:44px;max-width:44em}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;font-weight:500;letter-spacing:.08em;color:var(--c-brand);
  text-transform:none;
}
.eyebrow::before{content:"";width:20px;height:1px;background:var(--c-gold)}
h1{font-size:32px;line-height:1.18;font-weight:700;letter-spacing:-.01em;color:var(--c-ink)}
h2{font-size:26px;line-height:1.25;font-weight:600;letter-spacing:-.01em;color:var(--c-ink)}
h3{font-size:20px;line-height:1.4;font-weight:600;color:var(--c-ink)}
.lead{font-size:17px;line-height:1.85;color:var(--c-text);max-width:44em}
.small{font-size:14px;line-height:1.7;color:var(--c-muted)}
@media (min-width:768px){
  h1{font-size:44px}
  h2{font-size:32px}
  .section{padding:104px 0}
}
@media (min-width:1024px){
  h1{font-size:52px}
}

/* ============ Hero 窄条 ============ */
.page-hero{
  position:relative;overflow:hidden;background:var(--c-dark);
  min-height:280px;display:flex;align-items:center;
}
.page-hero .hero-bg{
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  opacity:.34;
}
.page-hero .hero-veil{
  position:absolute;inset:0;
  background:linear-gradient(100deg, rgba(12,33,31,.94) 0%, rgba(12,33,31,.78) 48%, rgba(12,33,31,.5) 100%);
}
.page-hero .container{position:relative;z-index:2;padding-top:56px;padding-bottom:56px}
.hero-title{color:var(--c-invert);max-width:22em}
.hero-sub{margin-top:16px;color:rgba(239,244,242,.74);font-size:16px;line-height:1.85;max-width:46em}
.breadcrumb{
  display:flex;align-items:center;gap:8px;font-size:13px;
  color:rgba(239,244,242,.55);margin-bottom:18px;
}
.breadcrumb a{color:rgba(239,244,242,.75)}
.breadcrumb a:hover{color:#fff}
.breadcrumb .slash{color:rgba(239,244,242,.3)}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}

/* ============ 平台切换 ============ */
.platform-tabs{
  display:flex;gap:8px;border-bottom:1px solid var(--c-line);
  overflow-x:auto;scrollbar-width:none;
}
.platform-tabs::-webkit-scrollbar{display:none}
.tab{
  position:relative;padding:14px 18px;font-size:15px;color:var(--c-muted);
  white-space:nowrap;font-weight:500;transition:color .2s var(--ease);
}
.tab::after{
  content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;background:var(--c-brand);
  transform:scaleX(0);transform-origin:center;transition:transform .32s var(--ease);
}
.tab:hover{color:var(--c-brand)}
.tab.is-active{color:var(--c-ink);font-weight:600}
.tab.is-active::after{transform:scaleX(1)}

/* ============ 步骤时间线 ============ */
.panel{display:none}
.panel.is-active{display:block;animation:fadeUp .56s var(--ease) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.timeline{position:relative;margin-top:40px}
.timeline::before{
  content:"";position:absolute;left:19px;top:12px;bottom:12px;width:2px;background:var(--c-brand);opacity:.28;
}
.step{position:relative;padding-left:56px;padding-bottom:32px}
.step:last-child{padding-bottom:0}
.step-node{
  position:absolute;left:0;top:2px;width:40px;height:40px;border-radius:50%;
  background:#fff;border:1px solid var(--c-line-strong);
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:600;color:var(--c-brand);
  transition:border-color .2s var(--ease), box-shadow .32s var(--ease);
}
.step:hover .step-node{border-color:var(--c-brand);box-shadow:var(--sh-1)}
.step-card{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);
  padding:22px 24px;box-shadow:var(--sh-1);
  transition:transform .32s var(--ease), box-shadow .32s var(--ease), border-color .32s var(--ease);
}
.step:hover .step-card{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--c-line-strong)}
.step-card h3{margin-bottom:8px}
.step-card p{font-size:15px;line-height:1.8;color:var(--c-text)}
.step-figure{margin-top:16px;border-radius:var(--r-sm);overflow:hidden;border:1px solid var(--c-line)}
.step-figure img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .32s var(--ease)}
.step:hover .step-figure img{transform:scale(1.03)}

/* ============ 系统要求规格条 ============ */
.spec-wrap{border:1px solid var(--c-line);border-radius:var(--r-md);background:#fff;overflow:hidden}
.spec-row{
  display:grid;grid-template-columns:1.1fr 1fr 1fr auto;gap:20px;align-items:center;
  min-height:64px;padding:12px 24px;border-bottom:1px solid var(--c-line);
  transition:background .2s var(--ease);
}
.spec-row:last-child{border-bottom:0}
.spec-row:hover{background:var(--c-bg)}
.spec-platform{display:flex;align-items:center;gap:12px}
.platform-dot{
  width:34px;height:34px;border-radius:var(--r-sm);flex:0 0 34px;
  background:var(--c-brand-soft);color:var(--c-brand);
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;letter-spacing:.02em;
}
.spec-platform strong{color:var(--c-ink);font-weight:600;font-size:15px;display:block;line-height:1.5}
.spec-platform span{font-size:13px;color:var(--c-muted)}
.spec-cell{font-size:14px;line-height:1.7;color:var(--c-text)}
.spec-cell em{display:block;font-style:normal;font-size:12px;color:var(--c-muted);letter-spacing:.02em}
@media (max-width:1023px){
  .spec-row{grid-template-columns:1fr 1fr;gap:14px 20px;min-height:0;padding:18px 20px}
  .spec-row .btn{grid-column:1 / -1;justify-self:start}
}
@media (max-width:520px){
  .spec-row{grid-template-columns:1fr}
}

/* ============ 卡点警示卡 ============ */
.warn-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:768px){.warn-grid{grid-template-columns:1fr 1fr}}
.warn-card{
  position:relative;background:#fff;border:1px solid var(--c-line);
  border-radius:var(--r-md);padding:22px 24px 22px 28px;
  transition:transform .32s var(--ease), box-shadow .32s var(--ease);
}
.warn-card::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:3px;border-radius:3px;background:var(--c-gold);
}
.warn-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2)}
.warn-card h3{font-size:17px;margin-bottom:8px}
.warn-card p{font-size:14px;line-height:1.8;color:var(--c-text)}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--c-line)}
.faq-item{border-bottom:1px solid var(--c-line)}
.faq-q{
  width:100%;display:flex;align-items:center;gap:16px;
  min-height:56px;padding:16px 0;text-align:left;
}
.faq-idx{font-size:13px;font-weight:400;color:var(--c-gold);letter-spacing:.06em;flex:0 0 26px}
.faq-t{flex:1;font-size:16px;font-weight:600;color:var(--c-ink);line-height:1.6}
.faq-icon{
  flex:0 0 20px;width:20px;height:20px;position:relative;transition:transform .3s var(--ease);color:var(--c-brand);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:currentColor;border-radius:2px;
}
.faq-icon::before{left:0;right:0;top:9px;height:1.5px}
.faq-icon::after{top:0;bottom:0;left:9px;width:1.5px}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .32s var(--ease)}
.faq-a-inner{padding:0 0 22px 42px;font-size:15px;line-height:1.85;color:var(--c-text);max-width:62em}
@media (max-width:520px){.faq-a-inner{padding-left:0}}

/* ============ 下载面板 ============ */
.download-panel{
  background:var(--c-brand-soft);border:1px solid var(--c-line);
  border-radius:var(--r-lg);padding:40px 28px;
}
@media (min-width:768px){.download-panel{padding:56px 48px}}
.qr-box{
  width:120px;height:120px;border:1px solid var(--c-line-strong);border-radius:var(--r-sm);
  background:#fff;display:flex;align-items:center;justify-content:center;
  font-size:12px;color:var(--c-muted);text-align:center;line-height:1.5;padding:8px;
}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

/* ============ 底部 CTA 深色条 ============ */
.cta-band{
  background:var(--c-dark);border-radius:var(--r-lg);
  padding:36px 28px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;
}
.cta-band h2{color:var(--c-invert);font-size:22px;line-height:1.4;max-width:26em}
.cta-band p{color:rgba(239,244,242,.62);font-size:14px;margin-top:8px}
@media (min-width:768px){.cta-band{padding:44px 48px}}

/* ============ 页脚 ============ */
.footer-link{color:rgba(239,244,242,.62);font-size:14px;transition:color .2s var(--ease)}
.footer-link:hover{color:#fff}
.footer .brand{color:var(--c-invert)}
.footer .brand:hover{color:var(--c-invert)}

/* ============ 移动端悬浮下载条 ============ */
.float-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:65;
  height:60px;background:#fff;border-top:1px solid var(--c-line);
  box-shadow:0 -8px 24px -18px rgba(12,33,31,.5);
  display:flex;align-items:center;gap:12px;padding:0 16px;
  transform:translateY(100%);opacity:0;pointer-events:none;
  transition:transform .32s var(--ease), opacity .32s var(--ease);
}
.float-bar.is-visible{transform:translateY(0);opacity:1;pointer-events:auto}
.float-bar .btn{flex:1}
.float-bar-link{font-size:13px;color:var(--c-muted);white-space:nowrap}
@media (min-width:1024px){.float-bar{display:none}}
body.has-float-bar{padding-bottom:72px}

/* ============ 入场动效 ============ */
.reveal{opacity:0;transform:translateY(12px)}
.reveal.is-in{opacity:1;transform:none;transition:opacity .56s var(--ease), transform .56s var(--ease)}
.d1{transition-delay:80ms}
.d2{transition-delay:160ms}
.d3{transition-delay:240ms}
.d4{transition-delay:320ms}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category3 */
:root{
  --c-brand:#135E56;
  --c-brand-deep:#0C211F;
  --c-brand-soft:#E7F0EE;
  --c-accent:#F26A2E;
  --c-accent-hover:#D9591F;
  --c-accent-active:#C24E18;
  --c-gold:#C3A46A;
  --c-bg:#F5F6F2;
  --c-card:#FFFFFF;
  --c-dark:#0C211F;
  --c-ink:#111A18;
  --c-body:#3A4A46;
  --c-muted:#7C8A86;
  --c-invert:#EFF4F2;
  --c-line:#E4E8E3;
  --c-line-strong:#CFD6D1;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:24px;
  --sh-1:0 1px 2px rgba(12,33,31,.05), 0 10px 28px -14px rgba(12,33,31,.10);
  --sh-2:0 2px 4px rgba(12,33,31,.06), 0 20px 44px -18px rgba(12,33,31,.16);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans","Noto Sans SC","Microsoft YaHei",ui-sans-serif,system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--c-body);
  background:var(--c-bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;padding:0}
ul,ol{list-style:none}
::selection{background:var(--c-brand-soft);color:var(--c-ink)}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}

h1,.h1{font-size:clamp(30px,4.2vw,52px);line-height:1.18;font-weight:700;letter-spacing:-.01em;color:var(--c-ink)}
h2,.h2{font-size:clamp(24px,2.6vw,34px);line-height:1.25;font-weight:600;color:var(--c-ink)}
h3,.h3{font-size:20px;line-height:1.4;font-weight:600;color:var(--c-ink)}
.h4{font-size:17px;line-height:1.45;font-weight:600;color:var(--c-ink)}
.lead{font-size:17px;line-height:1.9;color:var(--c-body)}
.muted{color:var(--c-muted)}
.small{font-size:14px;line-height:1.7}
.tiny{font-size:13px;line-height:1.6}

/* ===== 顶部信息条 ===== */
.topbar{background:var(--c-dark);color:rgba(239,244,242,.72);font-size:13px}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:36px}
.topbar-left{display:flex;align-items:center;gap:10px;min-width:0}
.topbar-domain{color:var(--c-invert);font-weight:600;white-space:nowrap}
.topbar-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-right{display:flex;align-items:center;gap:12px;white-space:nowrap}
.topbar-right a{transition:color 200ms var(--ease)}
.topbar-right a:hover{color:var(--c-invert)}
.topbar-sep{width:1px;height:14px;background:rgba(255,255,255,.18)}
@media (max-width:860px){.topbar-text{display:none}}
@media (max-width:600px){.topbar-secondary,.topbar-sep{display:none}}

/* ===== 主导航 ===== */
.site-header{
  position:sticky;top:0;z-index:70;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color 320ms var(--ease), box-shadow 320ms var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--c-line);box-shadow:0 1px 2px rgba(12,33,31,.04)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:64px}
@media (max-width:767px){.nav-inner{height:56px}}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--c-ink);letter-spacing:-.01em}
.brand-mark{position:relative;width:26px;height:26px;border-radius:8px;background:var(--c-brand);flex:none}
.brand-mark::after{content:"";position:absolute;inset:7px;border:1.5px solid rgba(255,255,255,.92);border-right-color:transparent;border-bottom-color:transparent;border-radius:3px;transform:rotate(45deg)}
.nav-links{display:none;align-items:center;gap:28px}
.nav-link{position:relative;font-size:15px;color:var(--c-body);padding:6px 0;transition:color 200ms var(--ease)}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--c-brand);transform:scaleX(0);transform-origin:left;transition:transform 320ms var(--ease)}
.nav-link:hover{color:var(--c-brand)}
.nav-link.is-active{color:var(--c-ink);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:16px}
.nav-minor{display:none;font-size:14px;color:var(--c-brand);border-bottom:1px solid var(--c-brand);padding-bottom:1px;transition:border-bottom-width 200ms var(--ease)}
.nav-minor:hover{border-bottom-width:2px}
.burger{display:flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;border-radius:var(--r-sm);align-items:center;transition:background-color 200ms var(--ease)}
.burger:hover{background:var(--c-brand-soft)}
.burger span{display:block;width:18px;height:1.5px;background:var(--c-ink);border-radius:2px;transition:transform 320ms var(--ease), opacity 200ms var(--ease)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}
@media (min-width:1024px){
  .nav-links{display:flex}
  .nav-minor{display:inline-block}
  .burger{display:none}
}

/* ===== 移动抽屉 ===== */
.drawer{
  position:fixed;inset:0 0 auto 0;z-index:90;
  background:#fff;border-bottom:1px solid var(--c-line);
  transform:translateY(-102%);
  transition:transform 320ms var(--ease);
  box-shadow:var(--sh-2);
  padding:22px 0 26px;
}
.drawer.is-open{transform:translateY(0)}
.drawer-list{display:flex;flex-direction:column}
.drawer-list a{display:flex;align-items:center;justify-content:space-between;padding:14px 0;font-size:16px;color:var(--c-body);border-bottom:1px solid var(--c-line)}
.drawer-list a.is-active{color:var(--c-ink);font-weight:600}
.drawer-list a span{color:var(--c-gold);font-size:13px}
.drawer-cta{margin-top:22px}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-md);
  font-size:15px;font-weight:600;border:1px solid transparent;
  transition:background-color 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}
.btn .arrow{transition:transform 200ms var(--ease)}
.btn:hover .arrow{transform:translateX(2px)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-primary{background:var(--c-accent);color:#fff}
.btn-primary:hover{background:var(--c-accent-hover)}
.btn-primary:active{background:var(--c-accent-active)}
.btn-ghost{background:#fff;border-color:var(--c-brand);color:var(--c-brand)}
.btn-ghost:hover{background:var(--c-brand-soft)}
.btn-ghost:active{background:#D8E7E4}
.btn-sm{height:40px;padding:0 18px;font-size:14px;border-radius:12px}
.btn-lg{height:52px;padding:0 28px;font-size:16px}
.btn-block{width:100%}
.btn-text{color:var(--c-brand);border-bottom:1px solid var(--c-brand);border-radius:0;height:auto;padding:2px 0;font-weight:600}
.btn-text:hover{border-bottom-width:2px}
.btn[disabled],.btn.is-disabled{opacity:.4;cursor:not-allowed}

/* ===== 标签 ===== */
.tag{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-sm);font-size:12px;font-weight:500;letter-spacing:.02em;background:var(--c-brand-soft);color:var(--c-brand)}
.tag-outline{background:transparent;border:1px solid var(--c-line-strong);color:var(--c-body)}
.tag-gold{background:transparent;border:1px solid rgba(195,164,106,.55);color:#8A7238}

/* ===== 面包屑 ===== */
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--c-muted)}
.crumb a{transition:color 200ms var(--ease)}
.crumb a:hover{color:var(--c-brand)}
.crumb .sep{color:var(--c-line-strong)}
.crumb .current{color:var(--c-ink)}

/* ===== 页面头图 ===== */
.page-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--c-line)}
.page-hero-bg{position:absolute;inset:0;background-image:url(/assets/images/backpic/back-1.webp);background-size:cover;background-position:center;opacity:.55}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(245,246,242,.97) 0%,rgba(245,246,242,.9) 45%,rgba(231,240,238,.7) 100%)}
.page-hero-inner{position:relative;z-index:2;padding:40px 0 48px}
@media (min-width:768px){.page-hero-inner{padding:52px 0 60px}}
.hero-title{max-width:18em}
.hero-sub{margin-top:18px;max-width:44em;font-size:16px;line-height:1.9;color:var(--c-body)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
@media (max-width:520px){.hero-actions .btn{width:100%}}

/* ===== 指标条 ===== */
.stat-band{margin-top:-32px;position:relative;z-index:5}
.stat-grid{display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:768px){.stat-grid{grid-template-columns:repeat(3,1fr)}}
.stat-card{background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--r-md);padding:22px 24px;box-shadow:var(--sh-1)}
.stat-num{font-size:30px;font-weight:700;line-height:1.2;color:var(--c-brand);letter-spacing:-.01em}
.stat-label{margin-top:4px;font-size:14px;color:var(--c-body)}
.stat-hint{margin-top:10px;font-size:13px;color:var(--c-muted);border-top:1px solid var(--c-line);padding-top:10px}

/* ===== 板块 ===== */
.section{padding:64px 0 0}
@media (min-width:768px){.section{padding:88px 0 0}}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:28px}
.section-head p{max-width:52em;margin-top:10px;font-size:15px;color:var(--c-muted)}

/* ===== 教程布局 ===== */
.doc-layout{display:grid;grid-template-columns:1fr;gap:28px}
@media (min-width:1024px){.doc-layout{grid-template-columns:3fr 9fr;gap:48px}}
.side-nav{display:flex;gap:10px;overflow-x:auto;padding-bottom:10px;border-bottom:1px solid var(--c-line);-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.side-nav::-webkit-scrollbar{height:4px}
.side-nav::-webkit-scrollbar-thumb{background:var(--c-line-strong);border-radius:4px}
.side-title{display:none}
.side-link{
  flex:none;white-space:nowrap;font-size:14px;color:var(--c-body);
  padding:8px 14px;border-radius:var(--r-sm);border:1px solid var(--c-line);
  background:#fff;transition:color 200ms var(--ease), background-color 200ms var(--ease), border-color 200ms var(--ease);
}
.side-link:hover{color:var(--c-brand);border-color:var(--c-line-strong)}
.side-link.is-active{background:var(--c-brand-soft);border-color:var(--c-brand-soft);color:var(--c-brand);font-weight:600}
@media (min-width:1024px){
  .side-nav{display:block;position:sticky;top:96px;overflow:visible;border-bottom:0;padding-bottom:0}
  .side-title{display:block;font-size:13px;letter-spacing:.06em;color:var(--c-muted);margin-bottom:14px}
  .side-link{display:block;border:0;border-left:2px solid var(--c-line);border-radius:0;background:transparent;padding:11px 14px;white-space:normal;font-size:14.5px}
  .side-link + .side-link{margin-top:2px}
  .side-link.is-active{border-left-color:var(--c-brand);border-radius:0 var(--r-sm) var(--r-sm) 0}
}

.doc-section{padding-top:34px;scroll-margin-top:96px}
.doc-section + .doc-section{margin-top:34px;border-top:1px solid var(--c-line)}
@media (min-width:768px){.doc-section{padding-top:44px}.doc-section + .doc-section{margin-top:44px}}
.doc-index{font-size:13px;letter-spacing:.08em;color:var(--c-gold);font-weight:500}
.doc-section h2{margin-top:8px}
.doc-section p.desc{margin-top:14px;max-width:48em;font-size:15.5px;line-height:1.9}
.doc-points{margin-top:20px;display:grid;gap:10px}
.doc-points li{position:relative;padding-left:20px;font-size:15px;line-height:1.8}
.doc-points li::before{content:"";position:absolute;left:2px;top:.72em;width:7px;height:7px;border-radius:2px;background:var(--c-brand)}
.doc-figure{margin-top:22px;border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden;background:#fff}
.doc-figure .ratio{position:relative;width:100%;aspect-ratio:16/10;overflow:hidden}
.doc-figure img{width:100%;height:100%;object-fit:cover;transition:transform 560ms var(--ease)}
.doc-figure:hover img{transform:scale(1.03)}
.doc-figure figcaption{padding:12px 16px;font-size:13px;color:var(--c-muted);border-top:1px solid var(--c-line)}
.platform-note{margin-top:16px;display:flex;gap:12px;padding:14px 16px;background:var(--c-brand-soft);border-radius:var(--r-sm);border-left:3px solid var(--c-gold)}
.platform-note p{font-size:14px;color:var(--c-body)}
.platform-note strong{color:var(--c-ink)}

/* ===== 技巧卡片 ===== */
.tip-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:768px){.tip-grid{grid-template-columns:repeat(2,1fr)}}
.tip-card{
  background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--r-md);
  padding:24px;transition:transform 320ms var(--ease), box-shadow 320ms var(--ease), border-color 320ms var(--ease);
}
.tip-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--c-line-strong)}
.tip-head{display:flex;align-items:center;gap:12px}
.tip-icon{width:34px;height:34px;border-radius:var(--r-sm);background:var(--c-brand-soft);color:var(--c-brand);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex:none}
.tip-card p{margin-top:12px;font-size:14.5px;color:var(--c-body)}
.tip-meta{margin-top:16px;padding-top:12px;border-top:1px solid var(--c-line);font-size:13px;color:var(--c-muted)}

/* ===== 相关阅读卡片 ===== */
.card-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:640px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden;display:flex;flex-direction:column;transition:transform 320ms var(--ease), box-shadow 320ms var(--ease), border-color 320ms var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--c-line-strong)}
.card-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--c-brand-soft)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform 560ms var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}
.card-body{padding:20px;display:flex;flex-direction:column;flex:1}
.card-title{margin-top:12px;font-size:17px;line-height:1.45;font-weight:600;color:var(--c-ink)}
.card-excerpt{margin-top:10px;font-size:14px;line-height:1.75;color:var(--c-body);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--c-line);display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--c-muted)}
.card-foot .go{color:var(--c-brand);font-weight:600;transition:transform 200ms var(--ease)}
.card:hover .card-foot .go{transform:translateX(3px)}

/* ===== 下载 CTA ===== */
.cta-panel{background:var(--c-brand-soft);border-radius:var(--r-lg);padding:32px 24px;display:grid;grid-template-columns:1fr;gap:28px}
@media (min-width:900px){.cta-panel{grid-template-columns:7fr 5fr;padding:44px 48px;gap:40px;align-items:center}}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.qr-box{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);padding:18px;display:flex;flex-direction:column;align-items:center;gap:12px;justify-self:start}
@media (min-width:900px){.qr-box{justify-self:end}}
.qr-box svg{width:120px;height:120px;border:1px solid var(--c-line);border-radius:var(--r-sm)}

/* ===== 页脚 ===== */
.footer-link{color:rgba(239,244,242,.62);font-size:14px;transition:color 200ms var(--ease)}
.footer-link:hover{color:var(--c-invert)}
footer .brand-mark{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2)}
footer .brand-mark::after{border-top-color:var(--c-invert);border-left-color:var(--c-invert)}

/* ===== 移动悬浮下载条 ===== */
.float-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:80;background:#fff;
  border-top:1px solid var(--c-line);
  box-shadow:0 -8px 24px -16px rgba(12,33,31,.22);
  transform:translateY(102%);opacity:0;pointer-events:none;
  transition:transform 320ms var(--ease), opacity 320ms var(--ease);
}
.float-bar.is-visible{transform:translateY(0);opacity:1;pointer-events:auto}
.float-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;height:60px}
.float-note{font-size:13px;color:var(--c-muted);display:flex;align-items:center;gap:8px}
.float-dot{width:6px;height:6px;border-radius:2px;background:var(--c-gold)}
@media (min-width:1024px){.float-bar{display:none}}
@media (max-width:1023px){body.has-float{padding-bottom:72px}}

/* ===== 入场动画 ===== */
.fade-up{opacity:0;transform:translateY(12px);animation:fadeUp 560ms var(--ease) forwards}
.fade-up.d1{animation-delay:80ms}
.fade-up.d2{animation-delay:160ms}
.fade-up.d3{animation-delay:240ms}
.fade-up.d4{animation-delay:320ms}
@keyframes fadeUp{to{opacity:1;transform:none}}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .fade-up{opacity:1;transform:none}
}

/* roulang page: category4 */
:root{
  --c-brand:#135E56;
  --c-brand-deep:#0C211F;
  --c-brand-soft:#E7F0EE;
  --c-accent:#F26A2E;
  --c-accent-hover:#D9591F;
  --c-accent-active:#C24E18;
  --c-gold:#C3A46A;
  --c-bg:#F5F6F2;
  --c-card:#FFFFFF;
  --c-dark:#0C211F;
  --c-ink:#111A18;
  --c-text:#3A4A46;
  --c-muted:#7C8A86;
  --c-invert:#EFF4F2;
  --c-line:#E4E8E3;
  --c-line-strong:#CFD6D1;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:24px;
  --sh-1:0 1px 2px rgba(12,33,31,.05),0 10px 28px -14px rgba(12,33,31,.10);
  --sh-2:0 2px 4px rgba(12,33,31,.06),0 20px 44px -18px rgba(12,33,31,.16);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:"PingFang SC","HarmonyOS Sans","Noto Sans SC","Microsoft YaHei",ui-sans-serif,system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0}
ul,ol{padding:0;list-style:none}
h1,h2,h3,h4{color:var(--c-ink);font-weight:600}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}
.section{padding:52px 0}
@media (min-width:768px){.section{padding:72px 0}}
@media (min-width:1024px){.section{padding:96px 0}}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:32px}
.eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.14em;color:var(--c-brand);text-transform:uppercase}
h2.section-title{font-size:26px;line-height:1.25;letter-spacing:-.01em}
@media (min-width:768px){h2.section-title{font-size:32px}}
@media (min-width:1024px){h2.section-title{font-size:34px}}
.lead{font-size:16px;color:var(--c-text);max-width:46em}
.muted{color:var(--c-muted)}
.hair{height:1px;background:var(--c-line);border:0}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--c-dark);color:rgba(239,244,242,.7);font-size:13px;height:36px;display:flex;align-items:center}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%}
.topbar-left,.topbar-right{display:flex;align-items:center;gap:12px;min-width:0}
.topbar-domain{color:var(--c-invert);font-weight:600;letter-spacing:.02em}
.topbar-sep{width:1px;height:12px;background:rgba(255,255,255,.16)}
.topbar-tip{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:32em}
.topbar-link{color:rgba(239,244,242,.82);transition:color .2s var(--ease)}
.topbar-link:hover{color:#fff}
.topbar-right .topbar-sep,.topbar-right .topbar-link:not(:first-child){display:none}
@media (min-width:768px){
  .topbar-right .topbar-sep,.topbar-right .topbar-link:not(:first-child){display:inline-flex}
}
@media (max-width:767px){.topbar-tip{display:none}}

/* ---------- 主导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color .32s var(--ease),box-shadow .32s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--c-line);box-shadow:var(--sh-1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:56px}
@media (min-width:768px){.nav-inner{height:64px}}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;color:var(--c-ink);font-size:17px;letter-spacing:-.01em}
.brand-mark{width:18px;height:18px;border-radius:5px;background:var(--c-brand);position:relative;flex:none}
.brand-mark::after{content:"";position:absolute;inset:5px 5px auto auto;width:8px;height:8px;border-radius:2px;background:var(--c-gold)}
.nav-links{display:none;align-items:stretch;gap:30px}
@media (min-width:1024px){.nav-links{display:flex}}
.nav-link{position:relative;display:flex;align-items:center;height:56px;font-size:15px;color:var(--c-text);transition:color .2s var(--ease)}
@media (min-width:768px){.nav-link{height:64px}}
.nav-link:hover{color:var(--c-brand)}
.nav-link.is-active{color:var(--c-ink);font-weight:600}
.nav-link.is-active::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--c-brand)}
.nav-actions{display:flex;align-items:center;gap:14px}
.nav-minor{display:none;font-size:14px;color:var(--c-brand);padding-bottom:2px;border-bottom:1px solid var(--c-brand);transition:border-bottom-width .2s var(--ease)}
.nav-minor:hover{border-bottom-width:2px}
@media (min-width:768px){.nav-minor{display:inline-flex}}
.burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;border-radius:8px;align-items:center}
.burger span{display:block;width:20px;height:2px;background:var(--c-ink);border-radius:2px;transition:transform .32s var(--ease),opacity .2s var(--ease)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media (min-width:1024px){.burger{display:none}}
.drawer{
  position:fixed;left:0;right:0;top:0;z-index:60;background:#fff;
  transform:translateY(-102%);transition:transform .32s var(--ease);
  box-shadow:var(--sh-2);padding:16px 0 24px;
}
.drawer.is-open{transform:translateY(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;height:48px}
.drawer-close{width:40px;height:40px;border-radius:8px;font-size:20px;color:var(--c-ink);display:flex;align-items:center;justify-content:center}
.drawer-nav{margin-top:8px;border-top:1px solid var(--c-line)}
.drawer-nav a{display:flex;align-items:center;justify-content:space-between;padding:16px 4px;border-bottom:1px solid var(--c-line);font-size:16px;color:var(--c-ink)}
.drawer-nav a.is-active{color:var(--c-brand);font-weight:600}
.drawer-cta{margin-top:20px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-md);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:background-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease),transform .32s var(--ease),border-color .2s var(--ease);
}
.btn .arrow{display:inline-block;transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(3px)}
.btn-primary{background:var(--c-accent);color:#fff}
.btn-primary:hover{background:var(--c-accent-hover);transform:translateY(-1px);box-shadow:var(--sh-1)}
.btn-primary:active{background:var(--c-accent-active);transform:translateY(0)}
.btn-outline{background:#fff;border:1px solid var(--c-brand);color:var(--c-brand)}
.btn-outline:hover{background:var(--c-brand-soft)}
.btn-outline:active{background:#D8E7E4}
.btn-on-dark{background:transparent;border:1px solid rgba(255,255,255,.28);color:var(--c-invert)}
.btn-on-dark:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.5)}
.btn-sm{height:40px;padding:0 18px;font-size:14px;border-radius:var(--r-md)}
.btn-lg{height:52px;padding:0 30px;font-size:16px}
.btn:disabled,.btn.is-disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.btn-block{width:100%}

.tag{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-sm);background:var(--c-brand-soft);color:var(--c-brand);font-size:12px;font-weight:500;letter-spacing:.02em}
.tag-gold{border:1px solid var(--c-gold);background:#fff;color:#8A6F35}
.card{background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--r-md);transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--c-line-strong)}
.card-media{overflow:hidden;border-radius:var(--r-md) var(--r-md) 0 0}
.card-media img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .56s var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}

/* ---------- 面包屑与页头 ---------- */
.page-hero{
  position:relative;overflow:hidden;color:var(--c-invert);
  background-image:linear-gradient(100deg,rgba(12,33,31,.9) 0%,rgba(12,33,31,.72) 52%,rgba(12,33,31,.42) 100%),url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  display:flex;align-items:center;min-height:280px;padding:44px 0;
}
@media (min-width:768px){.page-hero{padding:60px 0;min-height:300px}}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:rgba(239,244,242,.72);margin-bottom:18px}
.crumbs a{color:rgba(239,244,242,.72);transition:color .2s var(--ease)}
.crumbs a:hover{color:#fff}
.crumbs .sep{color:rgba(239,244,242,.4)}
.crumbs .cur{color:var(--c-invert)}
.page-hero h1{
  color:var(--c-invert);font-size:30px;line-height:1.2;font-weight:700;letter-spacing:-.01em;max-width:22em;
}
@media (min-width:768px){.page-hero h1{font-size:40px}}
@media (min-width:1024px){.page-hero h1{font-size:50px}}
.page-hero .hero-sub{margin-top:16px;font-size:15px;line-height:1.8;color:rgba(239,244,242,.78);max-width:40em}
@media (min-width:768px){.page-hero .hero-sub{font-size:16px}}
.hero-inline{position:absolute;right:32px;bottom:28px;display:none;gap:12px;font-size:12px;letter-spacing:.02em;color:rgba(239,244,242,.7)}
@media (min-width:1024px){.hero-inline{display:flex}}

/* ---------- 版本摘要卡 ---------- */
.release-card{
  background:var(--c-dark);color:var(--c-invert);border-radius:var(--r-lg);
  padding:28px;border:1px solid rgba(255,255,255,.08);
}
@media (min-width:768px){.release-card{padding:40px}}
.release-card h2{color:var(--c-invert)}
.release-ver{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-top:14px}
.release-ver strong{font-size:34px;line-height:1.1;font-weight:700;letter-spacing:-.02em;color:#fff}
@media (min-width:768px){.release-ver strong{font-size:44px}}
.spec-list{margin-top:22px}
.spec-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.08);font-size:14px}
.spec-row:last-child{border-bottom:0}
.spec-row dt{color:rgba(239,244,242,.62)}
.spec-row dd{color:var(--c-invert);font-weight:600;text-align:right}
.qr-box{
  width:132px;padding:6px;background:#fff;border-radius:var(--r-sm);
  border:1px solid rgba(255,255,255,.5);
}
.qr-box svg{display:block;width:100%;height:auto}

/* ---------- 版本时间线 ---------- */
.timeline{position:relative;display:grid;gap:26px}
@media (min-width:768px){
  .timeline{grid-template-columns:repeat(2,1fr);gap:32px}
}
@media (min-width:1024px){
  .timeline{grid-template-columns:repeat(4,1fr);gap:24px;padding-top:8px}
  .timeline::before{content:"";position:absolute;top:9px;left:5%;right:5%;height:1px;background:var(--c-line-strong)}
}
.tl-node{position:relative;padding-left:30px}
@media (min-width:1024px){.tl-node{padding-left:0;padding-top:34px}}
.tl-dot{position:absolute;left:0;top:6px;width:18px;height:18px;border-radius:50%;background:#fff;border:1px solid var(--c-line-strong)}
@media (min-width:1024px){.tl-dot{left:0;top:0}}
.tl-node.is-current .tl-dot{background:var(--c-accent);border-color:var(--c-accent);box-shadow:0 0 0 4px rgba(242,106,46,.14)}
.tl-ver{font-size:17px;font-weight:600;color:var(--c-ink)}
.tl-date{font-size:13px;color:var(--c-muted);margin-top:2px}
.tl-note{font-size:14px;margin-top:8px;color:var(--c-text)}

/* ---------- 更新日志 ---------- */
.log-list{border-top:1px solid var(--c-line)}
.log-item{
  position:relative;display:grid;gap:12px;padding:26px 0;border-bottom:1px solid var(--c-line);
}
@media (min-width:768px){
  .log-item{grid-template-columns:190px 1fr;gap:36px;padding:30px 0}
}
.log-item.is-latest{padding-left:18px}
.log-item.is-latest::before{content:"";position:absolute;left:0;top:26px;bottom:26px;width:3px;border-radius:2px;background:var(--c-accent)}
.log-meta{display:flex;flex-direction:column;gap:8px;align-items:flex-start}
.badge-ver{display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--r-sm);border:1px solid var(--c-gold);color:#8A6F35;font-size:13px;font-weight:600;letter-spacing:.02em;background:#fff}
.log-date{font-size:13px;color:var(--c-muted)}
.log-body h3{font-size:18px;line-height:1.45;margin-bottom:12px}
.point-list li{position:relative;padding-left:20px;font-size:15px;line-height:1.8;color:var(--c-text);margin-bottom:6px}
.point-list li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;border-radius:2px;background:var(--c-brand-soft);box-shadow:inset 0 0 0 1px var(--c-brand)}

/* ---------- 图文区块 ---------- */
.split{display:grid;gap:28px;align-items:center}
@media (min-width:1024px){.split{grid-template-columns:1fr 1fr;gap:56px}}
.split-media{position:relative;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--c-line)}
.split-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.media-index{
  position:absolute;left:20px;top:16px;font-size:44px;line-height:1;font-weight:600;
  color:var(--c-gold);font-family:ui-sans-serif,system-ui,sans-serif;letter-spacing:-.02em;
}
.check-list{display:grid;gap:14px}
@media (min-width:768px){.check-list{grid-template-columns:1fr 1fr;gap:14px 32px}}
.check-list li{position:relative;padding-left:28px;font-size:15px;line-height:1.75}
.check-list li::before{
  content:"";position:absolute;left:0;top:8px;width:18px;height:18px;border-radius:6px;
  background:var(--c-brand-soft);box-shadow:inset 0 0 0 1px rgba(19,94,86,.28);
}
.check-list li::after{
  content:"";position:absolute;left:6px;top:13px;width:6px;height:3px;border-left:2px solid var(--c-brand);
  border-bottom:2px solid var(--c-brand);transform:rotate(-45deg);
}

/* ---------- 兼容性卡组 ---------- */
.compat-grid{display:grid;gap:20px}
@media (min-width:768px){.compat-grid{grid-template-columns:1fr 1fr}}
.compat-card{padding:26px;background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);transition:transform .32s var(--ease),box-shadow .32s var(--ease)}
.compat-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2)}
.compat-card h3{font-size:17px;margin-bottom:10px}
.compat-card p{font-size:14px;line-height:1.8;color:var(--c-text)}
.compat-card .req{margin-top:16px;padding-top:14px;border-top:1px solid var(--c-line);font-size:13px;color:var(--c-muted)}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.faq-item+.faq-item{border-top:1px solid var(--c-line)}
.faq-q{display:flex;align-items:center;gap:16px;width:100%;text-align:left;min-height:56px;padding:16px 0}
.faq-idx{font-size:13px;font-weight:500;color:var(--c-gold);font-family:ui-sans-serif,system-ui,sans-serif;flex:none;width:24px}
.faq-text{flex:1;font-size:16px;font-weight:600;color:var(--c-ink);line-height:1.6}
.faq-icon{flex:none;width:22px;height:22px;position:relative;transition:transform .32s var(--ease)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--c-brand);border-radius:2px}
.faq-icon::before{left:0;right:0;top:10px;height:2px}
.faq-icon::after{top:0;bottom:0;left:10px;width:2px;transition:opacity .2s var(--ease)}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .32s var(--ease)}
.faq-a p{padding:0 40px 22px 40px;font-size:15px;line-height:1.85;color:var(--c-text)}
@media (max-width:520px){.faq-a p{padding-left:0}}

/* ---------- CTA 条 ---------- */
.cta-band{
  background:var(--c-dark);color:var(--c-invert);border-radius:var(--r-lg);
  padding:32px 26px;border:1px solid rgba(255,255,255,.08);
  display:flex;flex-direction:column;gap:20px;
}
@media (min-width:768px){
  .cta-band{flex-direction:row;align-items:center;justify-content:space-between;padding:36px 44px;gap:32px}
}
.cta-band h2{color:var(--c-invert);font-size:22px;line-height:1.35}
@media (min-width:768px){.cta-band h2{font-size:26px}}
.cta-band p{font-size:14px;color:rgba(239,244,242,.66);margin-top:6px}

/* ---------- 下载按钮组 ---------- */
.download-panel{
  background:var(--c-brand-soft);border:1px solid rgba(19,94,86,.14);border-radius:var(--r-lg);
  padding:32px 24px;text-align:center;
}
@media (min-width:768px){.download-panel{padding:52px 48px}}
.platform-row{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:22px}
.download-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:16px;margin-top:28px}
.download-note{font-size:13px;color:var(--c-muted);margin-top:16px}

/* ---------- 页脚 ---------- */
.footer-link{color:rgba(239,244,242,.66);font-size:14px;transition:color .2s var(--ease)}
.footer-link:hover{color:#fff}

/* ---------- 移动端悬浮下载条 ---------- */
.mobile-cta{
  position:fixed;left:0;right:0;bottom:0;z-index:70;height:60px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:0 16px;background:#fff;border-top:1px solid var(--c-line);
  box-shadow:0 -8px 24px -16px rgba(12,33,31,.35);
  transform:translateY(102%);transition:transform .32s var(--ease);
}
.mobile-cta.is-visible{transform:translateY(0)}
@media (min-width:768px){.mobile-cta{display:none}}
body.has-mobile-cta{padding-bottom:72px}
.mobile-cta .hint{font-size:12px;color:var(--c-muted);line-height:1.5}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}