/* roulang page: index */
:root{
  --ink:#0B0F0E; --ink2:#141B19; --sand:#F7F4EC; --accent:#D8FF3E; --spark:#FF6A3D;
  --line-dark:rgba(255,255,255,.10); --line-light:#DED8CB;
  --shadow-1:0 1px 0 rgba(0,0,0,.04); --shadow-2:0 18px 40px -24px rgba(11,15,14,.35);
  --r-sm:4px; --r-md:10px; --r-pill:999px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--sand);color:#121816;
  font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
.num{font-family:"Inter",ui-sans-serif,system-ui,sans-serif;font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
@media(min-width:1024px){.container{padding:0 32px}}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;height:48px;padding:0 24px;border-radius:var(--r-md);font-weight:600;font-size:.9375rem;line-height:1;white-space:nowrap;transition:background-color .2s,color .2s,border-color .2s,transform .2s;cursor:pointer}
.btn-primary{background:var(--accent);color:var(--ink);border:1px solid var(--accent)}
.btn-primary:hover{background:var(--ink);color:var(--accent);border-color:var(--accent);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0) scale(.98)}
.btn-ghost{background:transparent;color:#121816;border:1px solid rgba(11,15,14,.28)}
.btn-ghost:hover{background:var(--accent);border-color:var(--accent);color:var(--ink);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(0) scale(.98)}
.btn-ghost-dark{background:transparent;color:var(--dtext);border:1px solid rgba(255,255,255,.28)}
.btn-ghost-dark:hover{background:var(--accent);border-color:var(--accent);color:var(--ink);transform:translateY(-1px)}
.btn-sm{height:40px;padding:0 18px;font-size:.875rem}

/* 文字链下划线展开 */
.u-link{position:relative;display:inline-block;padding-bottom:2px}
.u-link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:currentColor;transition:width .2s ease}
.u-link:hover::after,.u-link:focus-visible::after{width:100%}

/* chip / 徽章 */
.chip{display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--r-pill);font-size:11px;letter-spacing:.06em;font-weight:600;line-height:1}
.chip-accent{background:var(--accent);color:var(--ink)}
.chip-line{border:1px solid var(--line-light);color:#6B7269}
.chip-line-dark{border:1px solid rgba(255,255,255,.22);color:#8C948E}

/* 左侧竖向导航 */
.side-nav{position:fixed;left:0;top:0;height:100vh;width:88px;background:var(--ink);color:#EDF1EC;z-index:50;overflow:hidden;display:none;flex-direction:column;transition:width .2s ease;border-right:1px solid var(--line-dark)}
.side-nav:hover,.side-nav:focus-within{width:240px}
@media(min-width:1024px){.side-nav{display:flex}}
.brand-mark{width:48px;height:48px;flex:0 0 48px;background:var(--accent);color:var(--ink);display:flex;align-items:center;justify-content:center;font-weight:900;font-size:20px;border-radius:var(--r-sm)}
.brand-text{white-space:nowrap;opacity:0;transition:opacity .2s ease .05s;font-weight:700;font-size:14px;letter-spacing:.02em}
.side-nav:hover .brand-text,.side-nav:focus-within .brand-text{opacity:1}
.vnav-item{position:relative;display:flex;align-items:center;gap:14px;height:48px;padding-left:30px;color:#8C948E;font-size:14px;font-weight:600;white-space:nowrap;transition:color .2s ease}
.vnav-item:hover{color:#EDF1EC}
.vnav-item.is-active{color:#EDF1EC}
.vnav-item.is-active::before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;background:var(--accent);border-radius:0 2px 2px 0}
.vnav-icon{width:20px;height:20px;flex:0 0 20px;display:flex;align-items:center;justify-content:center;opacity:.9}
.vnav-text{opacity:0;transition:opacity .2s ease .05s}
.side-nav:hover .vnav-text,.side-nav:focus-within .vnav-text{opacity:1}

/* 移动抽屉 */
.drawer{position:fixed;left:0;top:0;bottom:0;width:280px;max-width:82vw;background:var(--ink);color:#EDF1EC;z-index:80;transform:translateX(-100%);transition:transform .24s ease;overflow-y:auto}
.drawer.is-open{transform:translateX(0)}
.drawer-mask{position:fixed;inset:0;background:rgba(11,15,14,.6);z-index:70;opacity:0;pointer-events:none;transition:opacity .24s ease}
.drawer-mask.is-open{opacity:1;pointer-events:auto}
.drawer-link{display:flex;align-items:center;justify-content:space-between;padding:15px 22px;font-size:15px;font-weight:600;color:#EDF1EC;border-bottom:1px solid var(--line-dark);transition:color .2s,padding-left .2s}
.drawer-link:hover{color:var(--accent);padding-left:26px}
.drawer-link.is-active{color:var(--accent)}

/* 倒计时条 */
.cd-bar{position:sticky;top:56px;z-index:40;background:var(--ink);color:#EDF1EC;border-bottom:1px solid var(--accent);min-height:48px;display:flex;align-items:center}
@media(min-width:1024px){.cd-bar{top:0}}
.cd-num{font-family:"Inter",ui-sans-serif;sans-serif;font-variant-numeric:tabular-nums;letter-spacing:.08em;font-weight:800}
@keyframes urgentPulse{0%,100%{opacity:1}50%{opacity:.42}}
.cd-bar.urgent .cd-num{color:var(--spark);animation:urgentPulse 1s ease-in-out infinite}

/* 卡片 */
.card{background:#fff;border:1px solid var(--line-light);border-radius:var(--r-md);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;display:block}
.card:hover{transform:translateY(-3px);border-color:var(--ink);box-shadow:var(--shadow-2)}
.card:hover .card-title{text-decoration:underline;text-underline-offset:4px}
.card-img{overflow:hidden;display:block;background:#F1EDE2}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.card:hover .card-img img{transform:scale(1.04)}
.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}

/* 图墙 */
.wall-grid{display:grid;gap:12px;grid-template-columns:1fr}
@media(min-width:640px){.wall-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.wall-grid{grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(3,160px)}}
.wall-item{position:relative;display:block;overflow:hidden;border-radius:2px;aspect-ratio:16/9;background:#F1EDE2}
@media(min-width:1024px){
  .wall-item{aspect-ratio:auto}
  .wall-a{grid-column:span 2;grid-row:span 2}
  .wall-d,.wall-e{grid-column:span 2}
}
.wall-item img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.wall-item .veil{position:absolute;inset:0;background:linear-gradient(to top,rgba(11,15,14,.46),rgba(11,15,14,0) 62%);opacity:0;transition:opacity .2s ease}
.wall-item .cap{position:absolute;left:16px;bottom:14px;right:16px;color:#EDF1EC;font-size:14px;font-weight:700;opacity:0;transform:translateY(6px);transition:opacity .2s ease,transform .2s ease}
.wall-item:hover img{transform:scale(1.06)}
.wall-item:hover .veil,.wall-item:focus-visible .veil{opacity:1}
.wall-item:hover .cap,.wall-item:focus-visible .cap{opacity:1;transform:none}
.wall-item:focus-visible{outline:1px solid var(--accent);outline-offset:2px}

/* 卖点分隔线 */
.sell-row{display:grid;grid-template-columns:1fr;gap:0}
@media(min-width:1024px){.sell-row{grid-template-columns:repeat(4,1fr)}}
.sell-item{padding:28px 0;border-top:1px solid var(--line-dark)}
@media(min-width:1024px){
  .sell-item{padding:36px 28px 36px 0;border-top:0;border-left:1px solid var(--line-dark)}
  .sell-item:first-child{border-left:0;padding-left:0}
}
.sell-num{font-family:"Inter",ui-sans-serif,sans-serif;font-size:56px;font-weight:900;line-height:1;color:transparent;-webkit-text-stroke:1px rgba(216,255,62,.55);font-variant-numeric:tabular-nums}

/* FAQ */
.faq-item{border-top:1px solid var(--line-light)}
.faq-item:last-child{border-bottom:1px solid var(--line-light)}
.faq-q{width:100%;display:flex;align-items:center;gap:14px;padding:22px 0;background:none;border:0;text-align:left;font-size:1rem;font-weight:700;cursor:pointer;color:#121816;transition:color .2s}
.faq-q:hover{color:#3E4A18}
.faq-q .dot{width:6px;height:6px;flex:0 0 6px;background:var(--accent);border-radius:1px}
.faq-q .plus{margin-left:auto;flex:0 0 auto;font-size:22px;font-weight:400;line-height:1;transition:transform .28s ease;color:#6B7269}
.faq-item.is-open .plus{transform:rotate(45deg)}
.faq-panel{max-height:0;overflow:hidden;transition:max-height .28s ease}
.faq-panel-inner{max-width:720px;padding:0 0 24px 20px;font-size:15px;line-height:1.85;color:#4C5349}

/* 表单 */
.field{position:relative;margin-bottom:22px}
.field label{display:block;font-size:12px;letter-spacing:.06em;color:#8C948E;margin-bottom:6px;transition:color .2s,transform .2s}
.field input,.field select{width:100%;background:transparent;border:0;border-bottom:1px solid rgba(255,255,255,.28);border-radius:0;padding:10px 0;color:#EDF1EC;outline:none;transition:border-color .2s;font-size:1rem}
.field select option{color:#121816}
.field input:focus,.field select:focus{border-bottom-color:var(--accent)}
.field:focus-within label{color:var(--accent);transform:translateY(-1px)}

/* 入场动效 */
.fade-up{opacity:0;transform:translateY(16px);transition:opacity .42s cubic-bezier(.2,.7,.2,1),transform .42s cubic-bezier(.2,.7,.2,1)}
.fade-up.is-in{opacity:1;transform:none}

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

/* roulang page: article */
:root{
  --ink:#0B0F0E;
  --ink-2:#141B19;
  --sand:#F7F4EC;
  --accent:#D8FF3E;
  --spark:#FF6A3D;
  --d-text:#EDF1EC;
  --d-mute:#8C948E;
  --l-text:#121816;
  --l-mute:#6B7269;
  --hair:#DED8CB;
  --hair-d:rgba(255,255,255,.10);
  --r-sm:4px;
  --r-md:10px;
  --r-pill:999px;
  --sh-1:0 1px 0 rgba(0,0,0,.04);
  --sh-2:0 18px 40px -24px rgba(11,15,14,.35);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--sand);
  color:var(--l-text);
  font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:1rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input,select{font:inherit;color:inherit;}
h1,h2,h3,h4,p,ul,ol{margin:0;}
ul{list-style:none;padding:0;}
.tnum{font-family:"Inter",ui-sans-serif,system-ui,sans-serif;font-variant-numeric:tabular-nums;}
:where(a,button,input,select,summary,[tabindex]):focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
  border-radius:var(--r-sm);
}
.container{width:100%;max-width:1280px;margin:0 auto;padding-left:20px;padding-right:20px;}
@media (min-width:768px){.container{padding-left:24px;padding-right:24px;}}

/* ============ 竖向导航（桌面） ============ */
.vside{
  position:fixed;top:0;left:0;bottom:0;width:88px;
  background:var(--ink);
  border-right:1px solid var(--hair-d);
  display:none;flex-direction:column;
  padding:20px 0 18px;
  overflow:hidden;
  z-index:40;
  transition:width .2s var(--ease);
}
@media (min-width:1024px){.vside{display:flex;}}
.vside:hover,.vside:focus-within{width:240px;}
.vside-head{
  display:flex;align-items:center;gap:12px;
  padding:0 0 0 22px;margin-bottom:6px;white-space:nowrap;
}
.brand-mark{
  width:44px;height:44px;flex:0 0 44px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--accent);color:var(--ink);
  font-weight:900;font-size:20px;border-radius:4px;
}
.brand-full{
  font-size:14px;font-weight:800;color:var(--d-text);
  opacity:0;transition:opacity .18s var(--ease);
}
.vside:hover .brand-full,.vside:focus-within .brand-full{opacity:1;}
.vnav-item{
  position:relative;display:flex;align-items:center;gap:14px;
  height:48px;padding-left:22px;padding-right:16px;
  color:var(--d-mute);white-space:nowrap;
  border-left:3px solid transparent;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.vnav-item:hover{color:var(--d-text);background:rgba(255,255,255,.04);}
.vnav-item.is-active{
  color:#fff;border-left-color:var(--accent);
  background:rgba(216,255,62,.06);
}
.vnav-icon{flex:0 0 24px;display:inline-flex;align-items:center;justify-content:center;}
.vnav-text{
  font-size:14px;font-weight:600;
  opacity:0;transition:opacity .18s var(--ease);
}
.vside:hover .vnav-text,.vside:focus-within .vnav-text{opacity:1;}
.vside-foot{margin-top:auto;padding:16px 22px 0;white-space:nowrap;}

/* ============ 移动端顶栏 + 抽屉 ============ */
.mtop{
  position:fixed;top:0;left:0;right:0;height:56px;z-index:50;
  background:var(--ink);color:var(--d-text);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;border-bottom:1px solid var(--hair-d);
}
@media (min-width:1024px){.mtop{display:none;}}
.icon-btn{
  width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--hair-d);border-radius:var(--r-sm);color:var(--d-text);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.icon-btn:hover{border-color:var(--accent);color:var(--accent);}
.drawer{
  position:fixed;top:0;left:0;bottom:0;width:280px;z-index:60;
  background:var(--ink);display:flex;flex-direction:column;
  transform:translateX(-100%);
  transition:transform .28s var(--ease);
}
.drawer.is-open{transform:translateX(0);}
.drawer-mask{
  position:fixed;inset:0;z-index:55;background:rgba(11,15,14,.6);
  opacity:0;pointer-events:none;transition:opacity .28s var(--ease);
}
.drawer-mask.is-open{opacity:1;pointer-events:auto;}
.dnav-item{
  display:flex;align-items:center;gap:12px;
  padding:14px 18px;border-radius:var(--r-md);
  color:var(--d-mute);font-size:15px;font-weight:600;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.dnav-item:hover{color:var(--d-text);background:rgba(255,255,255,.05);}
.dnav-item.is-active{color:var(--ink);background:var(--accent);}

/* ============ 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:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn-primary{background:var(--accent);color:var(--ink);border:1px solid var(--accent);}
.btn-primary:hover{background:var(--ink);color:var(--accent);border-color:var(--accent);transform:translateY(-1px);}
.btn-primary:active{transform:translateY(0) scale(.98);}
.btn-ghost{background:transparent;color:var(--l-text);border:1px solid var(--hair);}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink);transform:translateY(-1px);}
.btn-ghost-d{background:transparent;color:var(--d-text);border:1px solid rgba(255,255,255,.28);}
.btn-ghost-d:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}

/* ============ 徽章 / chip ============ */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  height:26px;padding:0 12px;border-radius:var(--r-pill);
  font-size:11px;letter-spacing:.06em;line-height:1;white-space:nowrap;
}
.chip-accent{background:var(--accent);color:var(--ink);font-weight:700;}
.chip-line{border:1px solid var(--hair);color:var(--l-mute);}
.chip-line-d{border:1px solid rgba(255,255,255,.18);color:var(--d-mute);}
.chip:hover.chip-line{border-color:var(--ink);color:var(--ink);}

/* ============ 下划线动效 ============ */
.link-u{position:relative;display:inline-block;}
.link-u::after{
  content:'';position:absolute;left:0;bottom:-2px;height:1px;width:0;
  background:currentColor;transition:width .22s var(--ease);
}
.link-u:hover::after{width:100%;}

/* ============ 文章页头部 ============ */
.art-head{background:var(--ink);color:var(--d-text);padding:88px 0 64px;}
@media (min-width:1024px){.art-head{padding:72px 0 76px;}}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--d-mute);}
.crumbs a{color:var(--d-mute);transition:color .18s var(--ease);}
.crumbs a:hover{color:var(--accent);}
.crumbs .sep{color:rgba(255,255,255,.22);}
.crumbs .cur{color:rgba(237,241,236,.55);max-width:60ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.art-h1{
  font-size:clamp(2rem,4.2vw,3.25rem);
  line-height:1.12;font-weight:800;letter-spacing:-.02em;
  color:#fff;margin-top:22px;max-width:22ch;
}
.art-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin-top:22px;padding-top:20px;
  border-top:1px solid var(--hair-d);
  font-size:13px;color:var(--d-mute);letter-spacing:.04em;
}
.art-meta .dot{color:rgba(255,255,255,.25);}

/* ============ 文章正文 ============ */
.art-wrap{padding:56px 0 72px;}
@media (min-width:1024px){.art-wrap{padding:80px 0 96px;}}
.art-card{
  max-width:760px;margin:0 auto;background:#fff;
  border:1px solid var(--hair);border-radius:var(--r-md);
  padding:28px 20px 32px;box-shadow:var(--sh-1);
}
@media (min-width:768px){.art-card{padding:48px 48px 52px;}}
.art-body{font-size:1rem;line-height:1.9;color:#1B221F;}
.art-body>*:first-child{margin-top:0;}
.art-body p{margin:0 0 1.2em;}
.art-body h2{
  font-size:clamp(1.25rem,2.2vw,1.375rem);font-weight:800;line-height:1.35;
  margin:2.5em 0 .8em;padding-left:14px;border-left:4px solid var(--accent);
  color:var(--l-text);
}
.art-body h3{font-size:1.125rem;font-weight:700;margin:1.9em 0 .6em;color:var(--l-text);}
.art-body h4{font-size:1rem;font-weight:700;margin:1.5em 0 .5em;}
.art-body ul,.art-body ol{margin:0 0 1.2em;padding-left:0;}
.art-body ul li{position:relative;padding-left:18px;margin-bottom:.5em;}
.art-body ul li::before{content:'';position:absolute;left:0;top:.75em;width:6px;height:6px;background:var(--accent);}
.art-body ol{counter-reset:item;padding-left:0;}
.art-body ol li{position:relative;padding-left:26px;margin-bottom:.5em;counter-increment:item;}
.art-body ol li::before{
  content:counter(item,decimal-leading-zero);
  position:absolute;left:0;top:0;font-size:13px;font-weight:700;color:var(--l-mute);
  font-family:"Inter",ui-sans-serif,sans-serif;
}
.art-body blockquote{
  margin:1.6em 0;padding:16px 20px;background:var(--sand);
  border-left:2px solid var(--accent);color:#3A423E;font-style:normal;
}
.art-body blockquote p:last-child{margin-bottom:0;}
.art-body img{border-radius:8px;margin:1.6em auto;}
.art-body figure{margin:1.6em 0;}
.art-body figcaption{font-size:13px;text-align:center;color:var(--l-mute);margin-top:10px;}
.art-body table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:15px;}
.art-body th,.art-body td{border:1px solid var(--hair);padding:10px 14px;text-align:left;}
.art-body th{background:var(--sand);font-weight:700;}
.art-body code{
  background:var(--sand);border-radius:2px;padding:2px 6px;
  font-family:"Inter",ui-monospace,monospace;font-size:.9em;
}
.art-body pre{
  background:var(--ink);color:var(--d-text);border-radius:var(--r-md);
  padding:18px;overflow-x:auto;margin:1.6em 0;font-size:14px;line-height:1.7;
}
.art-body pre code{background:none;padding:0;color:inherit;}
.art-body a{color:#5A6B12;border-bottom:1px solid var(--accent);transition:font-weight .18s var(--ease),color .18s var(--ease);}
.art-body a:hover{font-weight:700;color:var(--l-text);}
.art-body hr{border:0;border-top:1px solid var(--hair);margin:2.4em 0;}
.art-empty{
  max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--hair);
  border-radius:var(--r-md);padding:56px 24px;text-align:center;
}
.art-empty .ph{font-size:11px;letter-spacing:.06em;color:var(--l-mute);}
.art-empty h2{font-size:1.375rem;font-weight:800;margin:14px 0 10px;}
.art-empty p{color:var(--l-mute);font-size:14px;margin-bottom:22px;}

/* ============ 文末区块 ============ */
.art-foot{max-width:760px;margin:0 auto;}
.tagrow{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px;}
.pn{
  display:grid;gap:0;margin-top:44px;
  border-top:1px solid var(--hair);
}
@media (min-width:768px){.pn{grid-template-columns:1fr 1fr;}}
.pn-item{
  display:block;padding:22px 0;border-bottom:1px solid var(--hair);
  transition:background-color .2s var(--ease);
}
@media (min-width:768px){
  .pn-item:first-child{padding-right:24px;border-right:1px solid var(--hair);}
  .pn-item:last-child{padding-left:24px;}
}
.pn-item:hover{background:rgba(255,255,255,.6);}
.pn-label{font-size:11px;letter-spacing:.06em;color:var(--l-mute);}
.pn-title{font-size:15px;font-weight:700;margin-top:8px;line-height:1.5;}

.sec-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:16px;
  border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);
  padding:18px 0;margin-bottom:28px;
}
.sec-title{font-size:clamp(1.25rem,2.4vw,1.625rem);font-weight:800;letter-spacing:-.01em;}

/* 相关推荐 */
.rel-wrap{margin-top:64px;}
.rel-scroll{
  display:grid;grid-auto-flow:column;grid-auto-columns:82%;
  gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:10px;-webkit-overflow-scrolling:touch;
}
@media (min-width:768px){
  .rel-scroll{grid-auto-flow:row;grid-template-columns:repeat(3,1fr);grid-auto-columns:auto;overflow:visible;}
}
.rel-card{
  scroll-snap-align:start;background:#fff;border:1px solid var(--hair);
  border-radius:var(--r-md);overflow:hidden;display:flex;flex-direction:column;
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.rel-card:hover{transform:translateY(-3px);border-color:var(--ink);box-shadow:var(--sh-2);}
.rel-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--sand);}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease);}
.rel-card:hover .rel-thumb img{transform:scale(1.04);}
.rel-body{padding:18px;display:flex;flex-direction:column;gap:10px;flex:1;}
.rel-title{font-size:15px;font-weight:700;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rel-card:hover .rel-title{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;}
.rel-desc{font-size:13px;color:var(--l-mute);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rel-meta{font-size:12px;color:var(--l-mute);margin-top:auto;display:flex;align-items:center;gap:8px;letter-spacing:.04em;}
.backlink{display:inline-flex;align-items:center;gap:8px;margin-top:32px;font-size:14px;font-weight:600;color:var(--l-text);}
.backlink svg{transition:transform .2s var(--ease);}
.backlink:hover svg{transform:translateX(-3px);}

/* ============ FAQ ============ */
.faq{margin-top:72px;padding-top:8px;}
.faq-list{max-width:720px;}
.faq-item{border-bottom:1px solid var(--hair);}
.faq-q{
  width:100%;display:flex;align-items:flex-start;gap:14px;
  padding:22px 0;text-align:left;font-size:15px;font-weight:700;color:var(--l-text);
}
.faq-q .dotmark{flex:0 0 6px;width:6px;height:6px;margin-top:9px;background:var(--accent);}
.faq-q .sign{
  margin-left:auto;flex:0 0 20px;font-size:20px;line-height:1;color:var(--l-mute);
  transition:transform .28s var(--ease),color .28s var(--ease);
}
.faq-item.is-open .faq-q .sign{transform:rotate(45deg);color:var(--l-text);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s var(--ease);}
.faq-a-inner{max-width:720px;padding:0 0 22px 20px;font-size:15px;line-height:1.85;color:var(--l-mute);}

/* ============ CTA 条 ============ */
.cta-band{background:var(--ink);color:var(--d-text);margin-top:88px;padding:64px 0;}
@media (min-width:768px){.cta-band{padding:80px 0;}}
.cta-band h2{font-size:clamp(1.5rem,2.8vw,2.125rem);font-weight:800;line-height:1.2;color:#fff;max-width:20ch;}
.cta-band p{color:var(--d-mute);font-size:15px;margin-top:16px;max-width:52ch;}

/* ============ 页脚 ============ */
.foot-link{display:inline-block;transition:color .2s var(--ease),transform .2s var(--ease);}
.foot-link:hover{color:var(--accent);transform:translateX(-2px);}

/* ============ 入场动效 ============ */
.rise{opacity:0;transform:translateY(16px);animation:rise .42s var(--ease) forwards;}
.rise-1{animation-delay:.06s;}
.rise-2{animation-delay:.12s;}
.rise-3{animation-delay:.18s;}
@keyframes rise{to{opacity:1;transform:translateY(0);}}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
  .rise{opacity:1;transform:none;}
}

/* roulang page: category1 */
:root{
    --ink:#0B0F0E;
    --ink-2:#141B19;
    --sand:#F7F4EC;
    --accent:#D8FF3E;
    --spark:#FF6A3D;
    --dtext:#EDF1EC;
    --dmute:#8C948E;
    --ltext:#121816;
    --lmute:#6B7269;
    --line:#DED8CB;
    --line-dark:rgba(255,255,255,.10);
    --r-sm:4px;
    --r-md:10px;
    --r-pill:999px;
    --shadow-1:0 1px 0 rgba(0,0,0,.04);
    --shadow-2:0 18px 40px -24px rgba(11,15,14,.35);
    --nav-w:88px;
    --nav-w-open:240px;
  }

  *,*::before,*::after{ box-sizing:border-box; }

  html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }

  body{
    margin:0;
    font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
    background:var(--sand);
    color:var(--ltext);
    font-size:1rem;
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
  }

  img{ max-width:100%; display:block; border:0; }
  a{ color:inherit; text-decoration:none; }
  button,input,select,textarea{ font:inherit; color:inherit; }
  ul,ol{ margin:0; padding:0; list-style:none; }
  h1,h2,h3,h4,p{ margin:0; }

  .num{ font-family:"Inter",ui-sans-serif,system-ui,sans-serif; font-variant-numeric:tabular-nums; font-feature-settings:"tnum" 1; }

  ::selection{ background:var(--accent); color:var(--ink); }

  a:focus-visible,
  button:focus-visible,
  summary:focus-visible,
  [tabindex]:focus-visible{
    outline:2px solid var(--accent);
    outline-offset:2px;
    border-radius:var(--r-sm);
  }

  /* ---------- 布局容器 ---------- */
  .container{
    width:100%;
    max-width:1280px;
    margin:0 auto;
    padding-left:24px;
    padding-right:24px;
  }
  @media (max-width:640px){
    .container{ padding-left:20px; padding-right:20px; }
  }

  .page-main{ padding-top:56px; padding-bottom:0; }
  @media (min-width:1024px){
    .page-main{ padding-top:0; }
  }

  .section{ padding-top:64px; padding-bottom:64px; }
  @media (min-width:768px){
    .section{ padding-top:88px; padding-bottom:88px; }
  }
  @media (min-width:1024px){
    .section{ padding-top:104px; padding-bottom:104px; }
  }

  /* ---------- 左侧竖向导航 ---------- */
  .vnav{
    position:fixed;
    left:0; top:0; bottom:0;
    width:var(--nav-w);
    background:var(--ink);
    border-right:1px solid var(--line-dark);
    z-index:60;
    overflow:hidden;
    transition:width .2s cubic-bezier(.2,.7,.2,1);
    display:none;
  }
  @media (min-width:1024px){
    .vnav{ display:flex; flex-direction:column; }
  }
  .vnav:hover,
  .vnav:focus-within{ width:var(--nav-w-open); }

  .vnav-head{
    padding:22px 0 18px;
    display:flex;
    align-items:center;
    gap:14px;
    border-bottom:1px solid var(--line-dark);
    padding-left:24px;
    min-height:88px;
  }
  .brand-mark{
    width:40px; height:40px;
    flex:0 0 40px;
    display:flex; align-items:center; justify-content:center;
    background:var(--accent);
    color:var(--ink);
    font-weight:800;
    font-size:19px;
    border-radius:var(--r-sm);
  }
  .vnav-brand-text{
    color:var(--dtext);
    font-size:14px;
    font-weight:700;
    line-height:1.35;
    white-space:nowrap;
    opacity:0;
    transition:opacity .18s ease;
  }
  .vnav:hover .vnav-brand-text,
  .vnav:focus-within .vnav-brand-text{ opacity:1; }

  .vnav-item{
    position:relative;
    display:flex;
    align-items:center;
    gap:16px;
    padding:14px 0 14px 24px;
    color:var(--dmute);
    font-size:14px;
    white-space:nowrap;
    transition:color .2s ease, background-color .2s ease;
  }
  .vnav-item:hover{ color:var(--dtext); background:rgba(255,255,255,.04); }
  .vnav-item.is-active{ color:var(--dtext); font-weight:600; }
  .vnav-item.is-active::before{
    content:"";
    position:absolute;
    left:0; top:10px; bottom:10px;
    width:3px;
    background:var(--accent);
  }
  .vnav-icon{
    width:22px; height:22px;
    flex:0 0 22px;
    display:flex; align-items:center; justify-content:center;
    color:currentColor;
  }
  .vnav-text{
    opacity:0;
    transition:opacity .18s ease;
  }
  .vnav:hover .vnav-text,
  .vnav:focus-within .vnav-text{ opacity:1; }

  .vnav-foot{
    margin-top:auto;
    padding:18px 24px 22px;
    border-top:1px solid var(--line-dark);
    color:var(--dmute);
    font-size:12px;
    letter-spacing:.04em;
    white-space:nowrap;
    opacity:0;
    transition:opacity .18s ease;
  }
  .vnav:hover .vnav-foot,
  .vnav:focus-within .vnav-foot{ opacity:1; }

  .shell{ width:100%; }
  @media (min-width:1024px){
    .shell{ padding-left:var(--nav-w); }
  }

  /* ---------- 移动端顶栏 ---------- */
  .topbar{
    position:sticky;
    top:0;
    z-index:55;
    height:54px;
    background:var(--ink);
    border-bottom:1px solid var(--line-dark);
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 18px;
  }
  @media (min-width:1024px){
    .topbar{ display:none; }
  }
  .topbar-brand{
    display:flex;
    align-items:center;
    gap:10px;
    color:var(--dtext);
    font-size:14px;
    font-weight:700;
  }
  .topbar-brand .brand-mark{ width:30px; height:30px; flex:0 0 30px; font-size:15px; }
  .menu-btn{
    width:40px; height:40px;
    display:flex; align-items:center; justify-content:center;
    background:transparent;
    border:1px solid var(--line-dark);
    border-radius:var(--r-sm);
    color:var(--dtext);
    cursor:pointer;
    transition:border-color .2s ease, color .2s ease;
  }
  .menu-btn:hover{ border-color:var(--accent); color:var(--accent); }

  .drawer{
    position:fixed;
    top:0; left:0; bottom:0;
    width:280px;
    background:var(--ink);
    z-index:80;
    transform:translateX(-102%);
    transition:transform .26s cubic-bezier(.2,.7,.2,1);
    display:flex;
    flex-direction:column;
    overflow-y:auto;
  }
  .drawer.is-open{ transform:translateX(0); }
  .drawer-head{
    padding:20px 20px 18px;
    border-bottom:1px solid var(--line-dark);
    display:flex;
    align-items:center;
    gap:12px;
  }
  .drawer-head span.brand-mark{ width:36px; height:36px; flex:0 0 36px; font-size:17px; }
  .drawer-head b{ color:var(--dtext); font-size:14px; line-height:1.35; }
  .drawer nav{ padding:12px 0; }
  .drawer .vnav-item{ padding:14px 20px; opacity:1; }
  .drawer .vnav-text{ opacity:1; }
  .drawer-close{
    margin-left:auto;
    width:34px; height:34px;
    display:flex; align-items:center; justify-content:center;
    background:transparent; border:1px solid var(--line-dark);
    border-radius:var(--r-sm); color:var(--dmute); cursor:pointer;
  }
  .drawer-close:hover{ color:var(--accent); border-color:var(--accent); }
  .drawer-foot{
    margin-top:auto;
    padding:18px 20px 24px;
    border-top:1px solid var(--line-dark);
    color:var(--dmute);
    font-size:12px;
  }
  .drawer-mask{
    position:fixed;
    inset:0;
    background:rgba(11,15,14,.6);
    z-index:75;
    opacity:0;
    visibility:hidden;
    transition:opacity .24s ease, visibility .24s ease;
  }
  .drawer-mask.is-open{ opacity:1; visibility:visible; }

  /* ---------- 通用排版 ---------- */
  .eyebrow{
    font-size:12px;
    letter-spacing:.06em;
    color:var(--lmute);
    text-transform:uppercase;
    font-weight:600;
  }
  .chip{
    display:inline-flex;
    align-items:center;
    height:26px;
    padding:0 12px;
    border-radius:var(--r-pill);
    font-size:11px;
    letter-spacing:.06em;
    border:1px solid var(--line);
    color:var(--lmute);
    background:transparent;
    white-space:nowrap;
  }
  .chip-accent{
    background:var(--accent);
    border-color:var(--accent);
    color:var(--ink);
    font-weight:700;
  }
  .chip-dark{
    border-color:var(--line-dark);
    color:var(--dmute);
  }

  .h1{
    font-size:clamp(2rem,4.2vw,3.25rem);
    line-height:1.12;
    font-weight:800;
    letter-spacing:-.02em;
  }
  .h2{
    font-size:clamp(1.5rem,2.6vw,2.125rem);
    line-height:1.2;
    font-weight:800;
    letter-spacing:-.02em;
  }
  .h3{
    font-size:1.125rem;
    line-height:1.4;
    font-weight:700;
  }
  .lead{
    font-size:1.0625rem;
    line-height:1.8;
    color:var(--lmute);
  }

  .rule-top{ border-top:1px solid var(--line); }
  .rule-bottom{ border-bottom:1px solid var(--line); }

  /* ---------- 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;
    cursor:pointer;
    transition:background-color .2s ease, color .2s ease, border-color .2s ease, transform .18s ease, box-shadow .2s ease;
    white-space:nowrap;
  }
  .btn-primary{
    background:var(--accent);
    color:var(--ink);
    border-color:var(--accent);
  }
  .btn-primary:hover{
    background:var(--ink);
    color:var(--accent);
    border-color:var(--accent);
    transform:translateY(-1px);
  }
  .btn-primary:active{ transform:translateY(0) scale(.98); }
  .btn-ghost{
    background:transparent;
    color:var(--ltext);
    border-color:var(--line);
  }
  .btn-ghost:hover{
    border-color:var(--ink);
    color:var(--ink);
    transform:translateY(-1px);
  }
  .btn-ghost:active{ transform:translateY(0) scale(.98); }
  .btn-dark-ghost{
    background:transparent;
    color:var(--dtext);
    border-color:rgba(255,255,255,.28);
  }
  .btn-dark-ghost:hover{
    border-color:var(--accent);
    color:var(--accent);
    transform:translateY(-1px);
  }

  .link-underline{
    position:relative;
    display:inline-flex;
    align-items:center;
    gap:6px;
    font-size:14px;
    font-weight:600;
    color:var(--ltext);
    padding-bottom:2px;
  }
  .link-underline::after{
    content:"";
    position:absolute;
    left:0; right:0; bottom:0;
    height:1px;
    background:currentColor;
    transform:scaleX(1);
    transform-origin:left;
    transition:transform .22s cubic-bezier(.2,.7,.2,1);
  }
  .link-underline:hover{ color:var(--ink); }
  .link-underline:hover::after{ background:var(--accent); height:2px; }

  /* ---------- Hero ---------- */
  .hero{
    background:var(--sand);
    border-bottom:1px solid var(--line);
    padding-top:44px;
    padding-bottom:56px;
  }
  @media (min-width:768px){
    .hero{ padding-top:64px; padding-bottom:72px; }
  }
  @media (min-width:1024px){
    .hero{ padding-top:76px; padding-bottom:88px; }
  }
  .hero-media{
    position:relative;
    width:100%;
    aspect-ratio:4/3;
    border-radius:2px;
    overflow:hidden;
    border:1px solid var(--line);
    background:
      repeating-linear-gradient(135deg, rgba(11,15,14,.05) 0 1px, transparent 1px 9px),
      var(--sand);
  }
  .hero-media img{
    width:100%; height:100%;
    object-fit:cover;
  }
  .hero-media-tag{
    position:absolute;
    left:16px; bottom:16px;
    display:inline-flex;
    align-items:center;
    gap:8px;
    height:28px;
    padding:0 12px;
    border-radius:var(--r-pill);
    background:rgba(11,15,14,.82);
    color:var(--dtext);
    font-size:11px;
    letter-spacing:.06em;
  }
  .hero-media-tag i{
    width:6px; height:6px; border-radius:50%;
    background:var(--accent);
    display:inline-block;
    font-style:normal;
  }

  .stats{
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:0;
    border-top:1px solid var(--line);
  }
  .stat{
    padding:18px 18px 0 0;
    border-right:1px solid var(--line);
  }
  .stat:last-child{ border-right:0; padding-right:0; }
  .stat b{
    display:block;
    font-size:1.375rem;
    font-weight:800;
    line-height:1.2;
    letter-spacing:-.02em;
  }
  .stat span{
    display:block;
    margin-top:4px;
    font-size:12px;
    color:var(--lmute);
    letter-spacing:.04em;
  }
  @media (max-width:640px){
    .stat b{ font-size:1.125rem; }
    .stat span{ font-size:11px; }
  }

  .breadcrumb{
    display:flex;
    align-items:center;
    gap:8px;
    font-size:13px;
    color:var(--lmute);
    flex-wrap:wrap;
  }
  .breadcrumb a:hover{ color:var(--ink); }
  .breadcrumb .current{ color:var(--lmute); }
  .breadcrumb .sep{ opacity:.5; }

  /* ---------- 卡片 ---------- */
  .card{
    display:flex;
    flex-direction:column;
    background:var(--card);
    border:1px solid var(--line);
    border-radius:var(--r-md);
    overflow:hidden;
    transition:border-color .2s ease, transform .22s cubic-bezier(.2,.7,.2,1), box-shadow .22s ease;
  }
  .card:hover{
    border-color:var(--ink);
    transform:translateY(-3px);
    box-shadow:var(--shadow-2);
  }
  .card-media{
    position:relative;
    width:100%;
    aspect-ratio:16/9;
    overflow:hidden;
    background:
      repeating-linear-gradient(135deg, rgba(11,15,14,.05) 0 1px, transparent 1px 9px),
      var(--sand);
  }
  .card-media img{
    width:100%; height:100%;
    object-fit:cover;
    transition:transform .35s cubic-bezier(.2,.7,.2,1);
  }
  .card:hover .card-media img{ transform:scale(1.04); }
  .card-body{
    padding:20px 20px 22px;
    display:flex;
    flex-direction:column;
    gap:10px;
    flex:1;
  }
  .card-title{
    font-size:1.0625rem;
    font-weight:700;
    line-height:1.45;
    letter-spacing:-.01em;
    background-image:linear-gradient(currentColor,currentColor);
    background-repeat:no-repeat;
    background-size:0% 1px;
    background-position:0 100%;
    transition:background-size .24s cubic-bezier(.2,.7,.2,1);
    display:inline;
  }
  .card:hover .card-title{ background-size:100% 1px; }
  .card-text{
    font-size:14px;
    line-height:1.8;
    color:var(--lmute);
  }
  .card-foot{
    margin-top:auto;
    padding-top:14px;
    border-top:1px solid var(--line);
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    font-size:12px;
    color:var(--lmute);
    letter-spacing:.04em;
  }
  .card-foot .go{
    color:var(--ltext);
    font-weight:600;
    display:inline-flex;
    align-items:center;
    gap:4px;
  }
  .card:hover .card-foot .go{ color:var(--ink); }

  /* ---------- 分节说明（编号 + 发丝线） ---------- */
  .steps-block{ border-top:1px solid var(--line); }
  .step-row{
    display:grid;
    grid-template-columns:64px minmax(0,1fr);
    gap:8px 20px;
    padding:26px 0 28px;
    border-bottom:1px solid var(--line);
    scroll-margin-top:90px;
  }
  @media (min-width:768px){
    .step-row{ grid-template-columns:96px minmax(0,1fr); gap:8px 32px; padding:32px 0 34px; }
  }
  .step-num{
    font-size:clamp(1.75rem,3vw,2.25rem);
    font-weight:900;
    line-height:1;
    letter-spacing:-.03em;
    color:transparent;
    -webkit-text-stroke:1px rgba(11,15,14,.32);
  }
  .step-row h3{ font-size:1.125rem; font-weight:700; line-height:1.45; }
  .step-row p{
    margin-top:10px;
    font-size:15px;
    line-height:1.85;
    color:var(--lmute);
    max-width:720px;
  }
  .step-list{
    margin-top:14px;
    display:grid;
    gap:8px;
    max-width:720px;
  }
  .step-list li{
    position:relative;
    padding-left:18px;
    font-size:14px;
    line-height:1.8;
    color:var(--lmute);
  }
  .step-list li::before{
    content:"";
    position:absolute;
    left:0; top:.72em;
    width:6px; height:6px;
    background:var(--accent);
    border-radius:1px;
  }

  /* ---------- sticky 锚点目录 ---------- */
  .toc{
    position:sticky;
    top:24px;
    border:1px solid var(--line);
    border-radius:var(--r-md);
    background:var(--card);
    padding:20px 18px 22px;
  }
  .toc h3{
    font-size:11px;
    letter-spacing:.06em;
    color:var(--lmute);
    font-weight:700;
    padding-bottom:12px;
    border-bottom:1px solid var(--line);
  }
  .toc ul{ margin-top:12px; display:grid; gap:2px; }
  .toc a{
    display:flex;
    align-items:center;
    gap:10px;
    padding:9px 10px;
    border-radius:var(--r-sm);
    font-size:13px;
    color:var(--lmute);
    transition:background-color .18s ease, color .18s ease;
  }
  .toc a::before{
    content:"";
    width:14px; height:1px;
    background:currentColor;
    opacity:.45;
    flex:0 0 14px;
    transition:width .18s ease, opacity .18s ease, background-color .18s ease;
  }
  .toc a:hover{
    background:var(--sand);
    color:var(--ltext);
  }
  .toc a.is-active{
    color:var(--ink);
    font-weight:600;
    background:var(--sand);
  }
  .toc a.is-active::before{
    width:22px;
    opacity:1;
    background:var(--ink);
  }
  .toc-note{
    margin-top:16px;
    padding-top:14px;
    border-top:1px solid var(--line);
    font-size:12px;
    line-height:1.7;
    color:var(--lmute);
  }

  /* ---------- FAQ ---------- */
  .faq-list{ border-top:1px solid var(--line); max-width:760px; }
  .faq-item{ border-bottom:1px solid var(--line); }
  .faq-q{
    width:100%;
    display:flex;
    align-items:flex-start;
    gap:14px;
    padding:22px 0;
    background:transparent;
    border:0;
    text-align:left;
    cursor:pointer;
    font-size:16px;
    font-weight:700;
    line-height:1.6;
    color:var(--ltext);
    transition:color .2s ease;
  }
  .faq-q:hover{ color:var(--ink); }
  .faq-q .dot{
    width:6px; height:6px;
    flex:0 0 6px;
    margin-top:.62em;
    background:var(--accent);
  }
  .faq-q .sign{
    margin-left:auto;
    flex:0 0 22px;
    width:22px; height:22px;
    position:relative;
    transition:transform .28s cubic-bezier(.2,.7,.2,1);
  }
  .faq-q .sign::before,
  .faq-q .sign::after{
    content:"";
    position:absolute;
    background:var(--ltext);
    transition:background-color .2s ease;
  }
  .faq-q .sign::before{ left:0; right:0; top:10px; height:2px; }
  .faq-q .sign::after{ top:0; bottom:0; left:10px; width:2px; }
  .faq-item.is-open .faq-q .sign{ transform:rotate(45deg); }
  .faq-item.is-open .faq-q .sign::before,
  .faq-item.is-open .faq-q .sign::after{ background:var(--ink); }
  .faq-a{
    max-height:0;
    overflow:hidden;
    transition:max-height .28s cubic-bezier(.2,.7,.2,1);
  }
  .faq-a-inner{
    padding:0 0 24px 20px;
    max-width:720px;
    font-size:15px;
    line-height:1.85;
    color:var(--lmute);
  }
  .faq-a-inner p + p{ margin-top:10px; }

  /* ---------- CTA 条 ---------- */
  .cta-band{
    background:var(--ink);
    color:var(--dtext);
    border-radius:var(--r-md);
    padding:36px 28px;
    display:flex;
    flex-direction:column;
    gap:24px;
    align-items:flex-start;
    justify-content:space-between;
    position:relative;
    overflow:hidden;
  }
  @media (min-width:768px){
    .cta-band{ padding:44px 44px; flex-direction:row; align-items:center; }
  }
  .cta-band::after{
    content:"";
    position:absolute;
    right:-60px; bottom:-60px;
    width:220px; height:220px;
    border:1px solid rgba(216,255,62,.28);
    border-radius:50%;
    pointer-events:none;
  }
  .cta-band h2{
    font-size:clamp(1.375rem,2.4vw,1.875rem);
    font-weight:800;
    letter-spacing:-.02em;
    line-height:1.25;
  }
  .cta-band p{
    margin-top:10px;
    font-size:14px;
    line-height:1.8;
    color:var(--dmute);
    max-width:560px;
  }
  .cta-actions{ display:flex; gap:12px; flex-wrap:wrap; position:relative; z-index:1; }

  /* ---------- 页脚 ---------- */
  .footer{ background:var(--ink); color:var(--dtext); padding-top:64px; }
  .footer a{ transition:color .2s ease, transform .2s ease; display:inline-block; }
  .footer a:hover{ color:var(--accent); transform:translateX(-2px); }
  .footer-bottom{
    border-top:1px solid var(--line-dark);
    padding:20px 0 26px;
    display:flex;
    flex-direction:column;
    gap:10px;
    font-size:12px;
    color:var(--dmute);
    letter-spacing:.03em;
  }
  @media (min-width:768px){
    .footer-bottom{ flex-direction:row; align-items:center; justify-content:space-between; }
  }

  /* ---------- 动效 ---------- */
  .reveal{
    opacity:0;
    transform:translateY(16px);
    transition:opacity .42s cubic-bezier(.2,.7,.2,1), transform .42s cubic-bezier(.2,.7,.2,1);
  }
  .reveal.is-in{ opacity:1; transform:none; }

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

/* roulang page: category2 */
:root{
    --ink:#0B0F0E;
    --ink-2:#141B19;
    --sand:#F7F4EC;
    --white:#FFFFFF;
    --accent:#D8FF3E;
    --spark:#FF6A3D;
    --d-text:#EDF1EC;
    --d-mute:#8C948E;
    --l-text:#121816;
    --l-mute:#6B7269;
    --line-d:rgba(255,255,255,.10);
    --line-l:#DED8CB;
    --r-sm:4px;
    --r-md:10px;
    --r-pill:999px;
    --shadow-1:0 1px 0 rgba(0,0,0,.04);
    --shadow-2:0 18px 40px -24px rgba(11,15,14,.35);
    --nav-w:88px;
    --nav-w-open:240px;
  }

  *,*::before,*::after{ box-sizing:border-box; }
  html{ scroll-behavior:smooth; }
  body{
    margin:0;
    background:var(--sand);
    color:var(--l-text);
    font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
    font-size:16px;
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
  }
  img{ display:block; max-width:100%; height:auto; }
  a{ color:inherit; text-decoration:none; }
  button,input,select,textarea{ font:inherit; color:inherit; }
  ul,ol{ margin:0; padding:0; list-style:none; }
  h1,h2,h3,h4,p{ margin:0; }

  .num,
  .tabular{
    font-family:"Inter",ui-sans-serif,system-ui,sans-serif;
    font-variant-numeric:tabular-nums;
    font-feature-settings:"tnum" 1;
  }

  .container{
    width:100%;
    max-width:1280px;
    margin:0 auto;
    padding:0 24px;
  }

  a:focus-visible,
  button:focus-visible,
  input:focus-visible,
  select:focus-visible,
  figure:focus-visible{
    outline:2px solid var(--accent);
    outline-offset:2px;
    border-radius:var(--r-sm);
  }

  .skip-link{
    position:absolute;
    left:16px;
    top:-64px;
    z-index:200;
    background:var(--accent);
    color:var(--ink);
    padding:10px 18px;
    border-radius:var(--r-md);
    font-weight:600;
    transition:top .2s ease;
  }
  .skip-link:focus{ top:16px; }

  /* ============ 左侧竖向导航 ============ */
  .vnav{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    width:var(--nav-w);
    background:var(--ink);
    border-right:1px solid var(--line-d);
    padding:20px 14px;
    display:flex;
    flex-direction:column;
    z-index:80;
    overflow:hidden;
    transition:width .2s ease;
  }
  .vnav:hover,
  .vnav:focus-within{ width:var(--nav-w-open); }

  .vnav-brand{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:14px;
    padding-bottom:18px;
    margin-bottom:10px;
    border-bottom:1px solid var(--line-d);
    transition:flex-direction .2s ease;
  }
  .vnav:hover .vnav-brand,
  .vnav:focus-within .vnav-brand{
    flex-direction:row;
    align-items:center;
    gap:12px;
  }
  .brand-mark{
    flex:0 0 auto;
    width:40px;
    height:40px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:var(--accent);
    color:var(--ink);
    font-weight:900;
    font-size:18px;
    border-radius:4px;
    letter-spacing:0;
  }
  .brand-full{
    display:none;
    font-size:13.5px;
    font-weight:700;
    color:var(--d-text);
    white-space:nowrap;
  }
  .brand-vertical{
    writing-mode:vertical-rl;
    font-size:11px;
    letter-spacing:.18em;
    color:var(--d-mute);
    white-space:nowrap;
  }
  .vnav:hover .brand-full,
  .vnav:focus-within .brand-full{ display:inline; }
  .vnav:hover .brand-vertical,
  .vnav:focus-within .brand-vertical{ display:none; }

  .vnav-item{
    position:relative;
    display:flex;
    align-items:center;
    gap:14px;
    height:48px;
    padding:0 12px;
    margin-bottom:4px;
    color:var(--d-mute);
    border-left:3px solid transparent;
    border-radius:6px;
    white-space:nowrap;
    transition:color .18s ease, background .18s ease, border-color .18s ease;
  }
  .vnav-item:hover{
    color:var(--d-text);
    background:rgba(255,255,255,.05);
  }
  .vnav-item.is-active{
    color:#fff;
    border-left-color:var(--accent);
    background:rgba(255,255,255,.06);
  }
  .vnav-icon{ flex:0 0 auto; display:flex; width:20px; justify-content:center; }
  .vnav-text{
    font-size:13.5px;
    opacity:0;
    transition:opacity .2s ease;
  }
  .vnav:hover .vnav-text,
  .vnav:focus-within .vnav-text{ opacity:1; }

  .vnav-foot{
    margin-top:auto;
    padding-top:16px;
    border-top:1px solid var(--line-d);
    font-size:11px;
    letter-spacing:.08em;
    color:var(--d-mute);
    text-align:center;
  }
  .vnav:hover .vnav-foot,
  .vnav:focus-within .vnav-foot{ text-align:left; }

  /* ============ 移动端顶栏与抽屉 ============ */
  .mobile-bar{
    display:none;
    position:sticky;
    top:0;
    z-index:90;
    height:54px;
    background:rgba(11,15,14,.96);
    backdrop-filter:blur(6px);
    border-bottom:1px solid var(--line-d);
    align-items:center;
    justify-content:space-between;
    padding:0 20px;
  }
  .burger{
    width:40px;
    height:40px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:transparent;
    border:1px solid rgba(255,255,255,.18);
    border-radius:8px;
    cursor:pointer;
    color:var(--d-text);
    transition:border-color .18s ease, color .18s ease;
  }
  .burger:hover{ border-color:var(--accent); color:var(--accent); }

  .drawer{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    width:288px;
    background:var(--ink);
    border-right:1px solid var(--line-d);
    padding:22px 18px;
    z-index:120;
    transform:translateX(-100%);
    transition:transform .24s cubic-bezier(.2,.7,.2,1);
    overflow-y:auto;
  }
  .drawer.is-open{ transform:translateX(0); }
  .drawer .vnav-item{ opacity:1; }
  .drawer .vnav-text{ opacity:1; }
  .drawer-mask{
    position:fixed;
    inset:0;
    background:rgba(11,15,14,.6);
    z-index:110;
    opacity:0;
    transition:opacity .22s ease;
  }
  .drawer-mask.is-on{ opacity:1; }

  .main-wrap{ margin-left:var(--nav-w); }

  /* ============ 通用组件 ============ */
  .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;
    cursor:pointer;
    border:1px solid transparent;
    transition:all .2s ease;
  }
  .btn-primary{
    background:var(--accent);
    border-color:var(--accent);
    color:var(--ink);
  }
  .btn-primary:hover{
    background:var(--ink);
    color:var(--accent);
    border-color:var(--accent);
    transform:translateY(-1px);
  }
  .btn-primary:active{ transform:scale(.98); }
  .btn-ghost-d{
    background:transparent;
    border-color:rgba(255,255,255,.28);
    color:var(--d-text);
  }
  .btn-ghost-d:hover{
    border-color:var(--accent);
    color:var(--accent);
    transform:translateY(-1px);
  }
  .btn-ghost-l{
    background:transparent;
    border-color:var(--line-l);
    color:var(--l-text);
  }
  .btn-ghost-l:hover{
    border-color:var(--ink);
    color:var(--ink);
    transform:translateY(-1px);
  }

  .chip{
    display:inline-flex;
    align-items:center;
    height:26px;
    padding:0 12px;
    border-radius:var(--r-pill);
    font-size:11.5px;
    font-weight:600;
    letter-spacing:.06em;
    white-space:nowrap;
  }
  .chip-accent{ background:var(--accent); color:var(--ink); }
  .chip-line{ border:1px solid var(--line-l); color:var(--l-mute); }
  .chip-line-d{ border:1px solid rgba(255,255,255,.20); color:var(--d-text); }

  .ulink{
    position:relative;
    display:inline-block;
    padding-bottom:2px;
  }
  .ulink::after{
    content:"";
    position:absolute;
    left:0;
    bottom:0;
    height:1px;
    width:100%;
    background:currentColor;
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .22s ease;
  }
  .ulink:hover::after{ transform:scaleX(1); }

  .sec{ padding:96px 0; }
  .sec--dark{ background:var(--ink); color:var(--d-text); }
  .sec--white{ background:var(--white); }

  .sec-head{
    display:flex;
    flex-wrap:wrap;
    align-items:flex-end;
    justify-content:space-between;
    gap:20px;
    padding:18px 0;
    border-top:1px solid var(--line-l);
    border-bottom:1px solid var(--line-l);
    margin-bottom:36px;
  }
  .sec-head--d{ border-color:rgba(255,255,255,.12); }
  .eyebrow{
    font-size:12px;
    font-weight:600;
    letter-spacing:.16em;
    color:var(--l-mute);
    margin-bottom:10px;
  }
  .eyebrow--d{ color:var(--d-mute); }
  .sec-title{
    font-size:clamp(1.5rem,2.6vw,2.125rem);
    line-height:1.2;
    font-weight:800;
    letter-spacing:-.01em;
  }
  .sec-note{
    max-width:380px;
    font-size:14px;
    line-height:1.75;
    color:var(--l-mute);
  }
  .sec-note--d{ color:var(--d-mute); }

  /* ============ 面包屑 ============ */
  .breadcrumb{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:8px;
    font-size:13px;
    color:var(--d-mute);
    padding-top:28px;
  }
  .breadcrumb a{ transition:color .18s ease; }
  .breadcrumb a:hover{ color:var(--accent); }
  .breadcrumb .sep{ opacity:.5; }
  .breadcrumb .current{ color:rgba(237,241,236,.55); }

  /* ============ Hero ============ */
  .hero{
    background:
      radial-gradient(120% 90% at 88% 8%, rgba(216,255,62,.10) 0%, rgba(216,255,62,0) 55%),
      var(--ink);
    color:var(--d-text);
    padding:28px 0 88px;
    border-bottom:1px solid var(--line-d);
  }
  .hero h1{
    font-size:clamp(2rem,4.2vw,3.25rem);
    line-height:1.14;
    font-weight:800;
    letter-spacing:-.02em;
  }
  .hero-sub{
    font-size:1rem;
    line-height:1.8;
    color:var(--d-mute);
    max-width:520px;
  }
  .hero-figure{
    position:relative;
    overflow:hidden;
    border-radius:2px;
    border:1px solid var(--line-d);
    background:var(--ink-2);
    aspect-ratio:4/3;
  }
  .hero-figure img{
    width:100%;
    height:100%;
    object-fit:cover;
    transition:transform .5s cubic-bezier(.2,.7,.2,1);
  }
  .hero-figure:hover img{ transform:scale(1.03); }

  .stat-row{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:24px;
    border-top:1px solid rgba(255,255,255,.16);
    padding-top:20px;
  }
  .stat-item{ display:flex; flex-direction:column; gap:4px; }
  .stat-num{
    font-size:clamp(1.6rem,3vw,2.25rem);
    font-weight:800;
    line-height:1;
    color:var(--accent);
  }
  .stat-label{
    font-size:13px;
    letter-spacing:.04em;
    color:var(--d-mute);
  }

  /* ============ 时间轴 ============ */
  .timeline{
    position:relative;
    padding-left:0;
  }
  .timeline::before{
    content:"";
    position:absolute;
    left:31px;
    top:26px;
    bottom:26px;
    width:2px;
    background:linear-gradient(180deg,var(--accent) 0%, rgba(216,255,62,.35) 60%, rgba(216,255,62,.08) 100%);
  }
  .tl-item{
    position:relative;
    display:grid;
    grid-template-columns:64px 1fr;
    gap:28px;
    padding:28px 0;
    border-bottom:1px solid var(--line-l);
  }
  .tl-item:last-child{ border-bottom:0; }
  .tl-num{
    position:relative;
    z-index:1;
    width:64px;
    height:64px;
    display:flex;
    align-items:center;
    justify-content:center;
    border-radius:50%;
    background:var(--white);
    border:1px solid var(--line-l);
    color:var(--l-text);
    font-size:18px;
    font-weight:800;
    transition:border-color .2s ease, background .2s ease, color .2s ease;
  }
  .tl-item:hover .tl-num{
    background:var(--accent);
    border-color:var(--accent);
    color:var(--ink);
  }
  .tl-body h3{
    font-size:1.2rem;
    font-weight:700;
    line-height:1.4;
    margin-bottom:10px;
  }
  .tl-body p{
    font-size:15px;
    line-height:1.85;
    color:var(--l-mute);
    max-width:680px;
  }
  .tl-tip{
    display:inline-block;
    margin-top:12px;
    padding-left:12px;
    border-left:3px solid var(--accent);
    font-size:13.5px;
    line-height:1.7;
    color:var(--l-mute);
  }

  /* ============ 对照表 ============ */
  .compare{
    border:1px solid var(--line-l);
    border-radius:var(--r-md);
    overflow:hidden;
    background:var(--white);
  }
  .cmp-row{
    display:grid;
    grid-template-columns:150px 1fr 1fr;
    border-bottom:1px solid var(--line-l);
  }
  .cmp-row:last-child{ border-bottom:0; }
  .cmp-row:nth-child(even){ background:rgba(222,216,203,.22); }
  .cmp-row--head{
    background:var(--ink) !important;
    color:var(--d-text);
  }
  .cmp-key{
    padding:18px 20px;
    font-size:13px;
    font-weight:600;
    letter-spacing:.04em;
    color:var(--l-mute);
    border-right:1px solid var(--line-l);
  }
  .cmp-row--head .cmp-key{ border-right-color:rgba(255,255,255,.12); }
  .cmp-col{
    padding:18px 20px;
    font-size:15px;
    font-weight:700;
  }
  .cmp-col + .cmp-col{ border-left:1px solid rgba(255,255,255,.12); }
  .cmp-cell{
    padding:18px 20px;
    font-size:14.5px;
    line-height:1.8;
    color:var(--l-mute);
  }
  .cmp-cell + .cmp-cell{ border-left:1px solid var(--line-l); }

  /* ============ 图墙 ============ */
  .gallery{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:18px;
  }
  .gallery figure{
    position:relative;
    margin:0;
    overflow:hidden;
    border-radius:2px;
    background:var(--sand);
    cursor:pointer;
  }
  .gallery img{
    width:100%;
    aspect-ratio:4/5;
    object-fit:cover;
    transition:transform .3s cubic-bezier(.2,.7,.2,1);
  }
  .gallery figure:hover img{ transform:scale(1.06); }
  .g-overlay{
    position:absolute;
    inset:0;
    background:linear-gradient(180deg, rgba(11,15,14,0) 42%, rgba(11,15,14,.78) 100%);
    opacity:.5;
    transition:opacity .2s ease;
  }
  .gallery figure:hover .g-overlay{ opacity:1; }
  .gallery figcaption{
    position:absolute;
    left:16px;
    right:16px;
    bottom:14px;
    color:#fff;
    font-size:14px;
    font-weight:600;
    letter-spacing:.02em;
    transform:translateY(6px);
    opacity:0;
    transition:opacity .2s ease, transform .2s ease;
  }
  .gallery figure:hover figcaption,
  .gallery figure:focus-within figcaption{
    opacity:1;
    transform:none;
  }
  .g-index{
    position:absolute;
    left:16px;
    top:14px;
    font-size:12px;
    letter-spacing:.08em;
    color:rgba(255,255,255,.85);
  }

  /* ============ 提醒列表 ============ */
  .notes{ border-top:1px solid var(--line-l); }
  .notes li{
    display:grid;
    grid-template-columns:56px 1fr;
    gap:20px;
    padding:22px 0;
    border-bottom:1px solid var(--line-l);
    align-items:start;
  }
  .notes .n-num{
    font-size:14px;
    font-weight:800;
    letter-spacing:.06em;
    color:var(--accent);
    background:var(--ink);
    border-radius:var(--r-pill);
    height:28px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    width:44px;
  }
  .notes p{
    font-size:15px;
    line-height:1.8;
    color:var(--l-mute);
  }
  .notes strong{
    display:block;
    color:var(--l-text);
    font-size:15.5px;
    margin-bottom:4px;
  }

  /* ============ 答疑 ============ */
  .qa-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:24px;
  }
  .qa-card{
    background:var(--white);
    border:1px solid var(--line-l);
    border-left:3px solid var(--accent);
    border-radius:var(--r-md);
    padding:24px 22px;
    transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  }
  .qa-card:hover{
    transform:translateY(-3px);
    box-shadow:var(--shadow-2);
    border-color:var(--ink);
    border-left-color:var(--accent);
  }
  .qa-card h3{
    font-size:16px;
    font-weight:700;
    margin-bottom:10px;
  }
  .qa-card p{
    font-size:14px;
    line-height:1.85;
    color:var(--l-mute);
  }

  /* ============ CTA ============ */
  .cta-band{
    background:var(--ink);
    color:var(--d-text);
    padding:72px 0;
    border-top:1px solid var(--line-d);
  }
  .cta-band h2{
    font-size:clamp(1.5rem,2.6vw,2.125rem);
    font-weight:800;
    line-height:1.25;
  }
  .cta-band p{
    color:var(--d-mute);
    font-size:15px;
    line-height:1.8;
    max-width:560px;
  }

  /* ============ 页脚 ============ */
  .footer-link{
    display:inline-block;
    transition:color .18s ease, transform .18s ease;
  }
  .footer-link:hover{
    color:var(--accent);
    transform:translateX(-2px);
  }

  /* ============ 入场动效 ============ */
  .reveal{
    opacity:0;
    transform:translateY(16px);
    transition:opacity .42s cubic-bezier(.2,.7,.2,1), transform .42s cubic-bezier(.2,.7,.2,1);
  }
  .reveal.in{ opacity:1; transform:none; }

  /* ============ 响应式 ============ */
  @media (max-width:1023px){
    .vnav{ display:none; }
    .main-wrap{ margin-left:0; }
    .mobile-bar{ display:flex; }
    .gallery{ grid-template-columns:repeat(2,1fr); }
    .qa-grid{ grid-template-columns:1fr 1fr; }
  }
  @media (max-width:768px){
    .container{ padding:0 20px; }
    .sec{ padding:60px 0; }
    .hero{ padding:10px 0 60px; }
    .stat-row{ grid-template-columns:1fr; gap:14px; }
    .stat-item{
      flex-direction:row;
      align-items:baseline;
      gap:10px;
      padding-bottom:12px;
      border-bottom:1px solid rgba(255,255,255,.10);
    }
    .timeline::before{ left:25px; }
    .tl-item{
      grid-template-columns:52px 1fr;
      gap:18px;
      padding:22px 0;
    }
    .tl-num{ width:52px; height:52px; font-size:15px; }
    .cmp-row{ grid-template-columns:1fr 1fr; }
    .cmp-row--head .cmp-key{ display:none; }
    .cmp-key{
      grid-column:1 / -1;
      border-right:0;
      border-bottom:1px dashed var(--line-l);
      padding:14px 16px 8px;
      background:rgba(222,216,203,.35);
    }
    .cmp-row--head .cmp-col{ border-left:0; padding:16px; }
    .cmp-cell{ padding:14px 16px; font-size:14px; }
    .qa-grid{ grid-template-columns:1fr; }
    .notes li{ grid-template-columns:44px 1fr; gap:14px; }
    .cta-band{ padding:56px 0; }
  }
  @media (max-width:640px){
    .gallery{
      display:flex;
      gap:14px;
      overflow-x:auto;
      scroll-snap-type:x mandatory;
      padding-bottom:8px;
      -webkit-overflow-scrolling:touch;
    }
    .gallery figure{
      flex:0 0 78%;
      scroll-snap-align:start;
    }
    .gallery figcaption{ opacity:1; transform:none; }
    .g-overlay{ opacity:.85; }
    .gallery img{ aspect-ratio:16/10; }
    .btn{ width:100%; }
    .hero-actions{ display:flex; flex-direction:column; gap:12px; }
  }

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