/* roulang page: index */
/* ===================== 设计变量 ===================== */
:root{
  --bg:#070B14;
  --bg-2:#0C1322;
  --bg-3:#101A2C;
  --brand:#3FD9C8;
  --brand-h:#5FE7D8;
  --brand-a:#2AB8AA;
  --brand-deep:#0F6E66;
  --gold:#F2B872;
  --blue:#4C8CFF;
  --ok:#46D39A;
  --err:#F2607A;
  --text:#EAF1F8;
  --text-2:#A7B6C8;
  --text-3:#6B7C93;
  --on-brand:#04120F;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.05);
  --line-h:rgba(63,217,200,.35);
  --glass:rgba(18,28,46,.55);
  --r-lg:20px;
  --r-md:14px;
  --r-media:24px;
  --r-input:12px;
  --r-pill:999px;
  --shadow:0 20px 40px -20px rgba(0,0,0,.6);
  --glow:0 12px 40px -12px rgba(63,217,200,.45);
  --inset:inset 0 1px 0 rgba(255,255,255,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
  --container:1240px;
}
/* ===================== 基础重置 ===================== */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Noto Sans SC","HarmonyOS Sans","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.9;
  letter-spacing:.01em;
  -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;}
img{max-width:100%;display:block;border-style:none;}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease),transform .2s var(--ease);}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input,textarea{font:inherit;color:inherit;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
::selection{background:rgba(63,217,200,.3);color:#fff;}
/* ===================== 布局容器 ===================== */
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}
.section{padding:104px 0;position:relative;}
.section-alt{background:var(--bg-2);}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:44px;
}
.section-head h2{
  font-size:clamp(23px,2.4vw,34px);
  font-weight:700;
  line-height:1.35;
  letter-spacing:.01em;
}
.section-sub{
  margin-top:12px;
  color:var(--text-2);
  font-size:15px;
  line-height:1.8;
  max-width:640px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.04em;
  color:var(--brand);
  border:1px solid var(--line-h);
  background:rgba(63,217,200,.08);
  padding:5px 14px;
  border-radius:var(--r-pill);
  margin-bottom:16px;
}
.eyebrow::before{
  content:"";
  width:6px;height:6px;border-radius:50%;
  background:var(--brand);
  box-shadow:0 0 10px var(--brand);
}
.link-more{
  color:var(--text-2);
  font-size:14px;
  white-space:nowrap;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
}
.link-more:hover{color:var(--brand);border-bottom-color:var(--line-h);}
/* ===================== 按钮 ===================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 26px;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  transition:transform .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease),color .2s var(--ease);
  white-space:nowrap;
}
.btn-primary{
  background:var(--brand);
  color:var(--on-brand);
  box-shadow:var(--glow);
}
.btn-primary:hover{background:var(--brand-h);transform:translateY(-2px);}
.btn-primary:active{background:var(--brand-a);transform:translateY(0);}
.btn-ghost{
  border:1px solid var(--line-h);
  color:var(--text);
  background:transparent;
}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:rgba(63,217,200,.06);}
.btn-sm{height:40px;padding:0 20px;font-size:14px;}
.btn-block{width:100%;}
/* ===================== 顶部导航 ===================== */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:100;
  height:76px;
  background:rgba(7,11,20,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-2);
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header.is-scrolled{
  background:rgba(7,11,20,.92);
  border-bottom-color:var(--line);
}
.nav-wrap{
  height:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:17px;
  font-weight:700;
  letter-spacing:.02em;
  flex-shrink:0;
}
.brand-mark{
  width:26px;height:26px;
  border-radius:8px;
  background:linear-gradient(135deg,var(--brand) 0%,var(--brand-deep) 100%);
  box-shadow:var(--glow);
  position:relative;
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:7px;
  border-radius:3px;
  border:2px solid rgba(4,18,15,.7);
  border-right-color:transparent;
  border-bottom-color:transparent;
  transform:rotate(45deg);
}
.main-nav{
  display:flex;
  align-items:center;
  gap:32px;
  margin-left:auto;
}
.nav-link{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:6px 0;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:50%;bottom:-2px;
  width:4px;height:4px;
  border-radius:50%;
  background:var(--brand);
  opacity:0;
  transform:translate(-50%,4px);
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.nav-link:hover{color:var(--text);}
.nav-link:hover::after{opacity:1;transform:translate(-50%,0);}
.nav-link.is-active{color:var(--brand);}
.nav-link.is-active::before{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--brand),rgba(63,217,200,0));
}
.nav-actions{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.nav-toggle{
  display:none;
  width:42px;height:42px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  align-items:center;
  justify-content:center;
}
.nav-toggle span{
  display:block;
  width:18px;height:2px;
  background:var(--text);
  border-radius:2px;
  position:relative;
}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";
  position:absolute;left:0;
  width:18px;height:2px;border-radius:2px;
  background:var(--text);
  transition:transform .2s var(--ease);
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}
.nav-toggle.is-open span{background:transparent;}
.nav-toggle.is-open span::before{transform:translateY(6px) rotate(45deg);}
.nav-toggle.is-open span::after{transform:translateY(-6px) rotate(-45deg);}
/* ===================== Hero ===================== */
.hero{
  position:relative;
  padding:172px 0 116px;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  top:-120px;left:-10%;
  width:40vw;height:40vw;
  max-width:640px;max-height:640px;
  background:radial-gradient(circle,rgba(63,217,200,.28) 0%,rgba(63,217,200,0) 70%);
  filter:blur(120px);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  bottom:-160px;right:-6%;
  width:30vw;height:30vw;
  max-width:520px;max-height:520px;
  background:radial-gradient(circle,rgba(242,184,114,.12) 0%,rgba(242,184,114,0) 70%);
  filter:blur(120px);
  pointer-events:none;
}
.hero-grid{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:64px;
  align-items:center;
}
.hero h1{
  font-size:clamp(30px,4.2vw,54px);
  font-weight:800;
  line-height:1.25;
  letter-spacing:.01em;
  margin-bottom:20px;
}
.hero h1 em{
  font-style:normal;
  color:var(--brand);
  text-shadow:0 0 40px rgba(63,217,200,.4);
}
.hero-sub{
  font-size:17px;
  color:var(--text-2);
  line-height:1.9;
  max-width:520px;
  margin-bottom:34px;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:44px;}
.hero-stats{
  display:flex;
  flex-wrap:wrap;
  gap:40px;
  padding-top:26px;
  border-top:1px solid var(--line-2);
}
.hero-stat b{
  display:block;
  font-family:"Inter","DIN Alternate",system-ui,sans-serif;
  font-size:24px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--text);
}
.hero-stat span{
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.02em;
}
.hero-media{
  position:relative;
  justify-self:end;
  width:100%;
  max-width:360px;
  aspect-ratio:9/16;
  max-height:560px;
  border-radius:var(--r-media);
  border:1px solid var(--line);
  overflow:hidden;
  background:var(--bg-3);
  box-shadow:var(--shadow),var(--inset);
}
.hero-media img{
  width:100%;height:100%;
  object-fit:cover;
  opacity:.72;
}
.hero-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,11,20,.15) 0%,rgba(7,11,20,.9) 100%);
}
.hero-media-cap{
  position:absolute;
  left:20px;right:20px;bottom:18px;
  z-index:3;
  font-size:13px;
  color:var(--text-3);
  line-height:1.6;
}
.hero-play{
  position:absolute;
  top:50%;left:50%;
  transform:translate(-50%,-50%);
  z-index:3;
  width:64px;height:64px;
  border-radius:50%;
  border:1px solid rgba(63,217,200,.6);
  background:rgba(63,217,200,.12);
  backdrop-filter:blur(10px);
  display:flex;
  align-items:center;
  justify-content:center;
  animation:pulse 2.6s var(--ease) infinite;
}
.hero-play::before{
  content:"";
  width:0;height:0;
  border-left:14px solid var(--brand);
  border-top:9px solid transparent;
  border-bottom:9px solid transparent;
  margin-left:4px;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(63,217,200,.35);}
  50%{box-shadow:0 0 0 18px rgba(63,217,200,0);}
}
.hero-corner{
  position:absolute;
  width:22px;height:22px;
  z-index:3;
  border-color:rgba(63,217,200,.5);
}
.hero-corner.tl{top:14px;left:14px;border-top:1px solid;border-left:1px solid;}
.hero-corner.tr{top:14px;right:14px;border-top:1px solid;border-right:1px solid;}
.hero-corner.bl{bottom:14px;left:14px;border-bottom:1px solid;border-left:1px solid;}
.hero-corner.br{bottom:14px;right:14px;border-bottom:1px solid;border-right:1px solid;}
/* ===================== 爆款片段横滑 ===================== */
.slider-wrap{position:relative;}
.slider{
  display:flex;
  gap:20px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding:6px 4px 22px;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.slider::-webkit-scrollbar{display:none;}
.slider-card{
  flex:0 0 300px;
  scroll-snap-align:start;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow),var(--inset);
  overflow:hidden;
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.slider-card:hover{
  transform:translateY(-4px);
  border-color:var(--line-h);
  box-shadow:var(--glow),var(--inset);
}
.slider-thumb{
  position:relative;
  aspect-ratio:9/16;
  overflow:hidden;
  background:var(--bg-3);
}
.slider-thumb img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .24s var(--ease);
}
.slider-card:hover .slider-thumb img{transform:scale(1.04);}
.slider-badge{
  position:absolute;
  top:12px;left:12px;
  font-size:12px;
  letter-spacing:.04em;
  color:var(--text);
  padding:4px 12px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  background:rgba(7,11,20,.6);
  backdrop-filter:blur(10px);
}
.slider-play{
  position:absolute;
  top:50%;left:50%;
  transform:translate(-50%,-50%);
  width:44px;height:44px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,.25);
  background:rgba(7,11,20,.45);
  backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;
}
.slider-play::before{
  content:"";
  width:0;height:0;
  border-left:10px solid var(--brand);
  border-top:7px solid transparent;
  border-bottom:7px solid transparent;
  margin-left:3px;
}
.slider-body{padding:18px 20px 20px;}
.slider-title{
  font-size:18px;
  font-weight:600;
  line-height:1.55;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
  min-height:56px;
}
.slider-meta{
  margin-top:12px;
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.02em;
}
.slider-fade{
  position:absolute;
  top:0;right:0;bottom:22px;
  width:60px;
  background:linear-gradient(270deg,var(--bg) 10%,rgba(7,11,20,0));
  pointer-events:none;
}
.section-alt .slider-fade{background:linear-gradient(270deg,var(--bg-2) 10%,rgba(12,19,34,0));}
/* ===================== 种草清单 ===================== */
.pick-list{border-top:1px solid var(--line-2);}
.pick-item{
  display:grid;
  grid-template-columns:72px 1fr auto;
  gap:20px;
  align-items:center;
  padding:26px 16px;
  border-bottom:1px solid var(--line-2);
  transition:background-color .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease);
}
.pick-item:hover{
  background:rgba(18,28,46,.5);
  border-radius:var(--r-md);
  transform:translateX(12px);
  border-color:transparent;
}
.pick-num{
  font-family:"Inter","DIN Alternate",system-ui,sans-serif;
  font-size:28px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--gold);
  transition:color .2s var(--ease);
}
.pick-item:hover .pick-num{color:var(--brand);}
.pick-title{font-size:17px;font-weight:600;margin-bottom:4px;}
.pick-desc{font-size:15px;color:var(--text-2);line-height:1.8;}
.pick-arrow{
  width:28px;height:28px;
  border-radius:50%;
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-3);
  font-size:14px;
  transition:all .2s var(--ease);
}
.pick-item:hover .pick-arrow{border-color:var(--line-h);color:var(--brand);transform:translateX(4px);}
/* ===================== 最新信息 ===================== */
.post-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.post-card{
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  min-height:240px;
  padding:26px 24px;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow),var(--inset);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.post-card:hover{
  transform:translateY(-2px);
  border-color:var(--line-h);
  box-shadow:var(--glow),var(--inset);
}
.post-badge{
  display:inline-block;
  font-size:12px;
  letter-spacing:.04em;
  color:var(--brand);
  border:1px solid var(--line-h);
  background:rgba(63,217,200,.08);
  padding:3px 12px;
  border-radius:var(--r-pill);
  margin-bottom:14px;
}
.post-title{
  font-size:18px;
  font-weight:600;
  line-height:1.6;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
  margin-bottom:10px;
}
.post-excerpt{
  font-size:14px;
  color:var(--text-2);
  line-height:1.8;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-meta{
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid var(--line-2);
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.02em;
}
.empty-box{
  grid-column:1/-1;
  text-align:center;
  padding:64px 24px;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(18px);
}
.empty-icon{
  width:64px;height:64px;
  margin:0 auto 18px;
  border-radius:50%;
  background:rgba(63,217,200,.2);
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line-h);
}
.empty-icon svg{width:26px;height:26px;stroke:var(--brand);fill:none;stroke-width:1.6;}
.empty-box p{color:var(--text-2);font-size:15px;margin-bottom:20px;}
.pager{
  display:flex;
  justify-content:center;
  gap:10px;
  margin-top:44px;
}
.pager a,.pager span{
  min-width:40px;height:40px;
  padding:0 14px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:var(--r-pill);
  font-size:14px;
  border:1px solid var(--line);
  background:rgba(18,28,46,.5);
  color:var(--text-2);
}
.pager .current{
  background:var(--brand);
  color:var(--on-brand);
  border-color:var(--brand);
  box-shadow:var(--glow);
  font-weight:600;
}
.pager a:hover{border-color:var(--line-h);color:var(--brand);}
/* ===================== 口碑条 ===================== */
.review-track{
  display:flex;
  gap:20px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding:4px 4px 20px;
  scrollbar-width:none;
}
.review-track::-webkit-scrollbar{display:none;}
.review-card{
  flex:0 0 340px;
  scroll-snap-align:start;
  padding:26px 24px;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow),var(--inset);
  transition:border-color .2s var(--ease),transform .2s var(--ease);
}
.review-card:hover{border-color:var(--line-h);transform:translateY(-3px);}
.stars{color:var(--gold);font-size:14px;letter-spacing:.16em;margin-bottom:14px;}
.review-text{font-size:15px;line-height:1.85;color:var(--text);min-height:78px;}
.review-user{
  display:flex;align-items:center;gap:12px;
  margin-top:22px;
  padding-top:18px;
  border-top:1px solid var(--line-2);
}
.avatar{
  width:40px;height:40px;
  border-radius:50%;
  background:linear-gradient(135deg,rgba(63,217,200,.35),rgba(76,140,255,.25));
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:600;color:var(--brand);
  flex-shrink:0;
}
.review-name{font-size:14px;font-weight:600;}
.review-role{font-size:13px;color:var(--text-3);}
/* ===================== CTA 面板 ===================== */
.cta-panel{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  padding:44px 46px;
  border-radius:var(--r-lg);
  border:1px solid var(--line-h);
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow),var(--inset);
  position:relative;
  overflow:hidden;
}
.cta-panel::before{
  content:"";
  position:absolute;
  top:-140px;left:-60px;
  width:360px;height:360px;
  background:radial-gradient(circle,rgba(63,217,200,.24) 0%,rgba(63,217,200,0) 70%);
  filter:blur(90px);
  pointer-events:none;
}
.cta-copy{position:relative;z-index:2;}
.cta-copy h2{
  font-size:clamp(20px,2vw,26px);
  font-weight:700;
  margin-bottom:8px;
  line-height:1.4;
}
.cta-copy p{font-size:15px;color:var(--text-2);}
.cta-actions{
  position:relative;z-index:2;
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
}
.cta-text-link{
  font-size:14px;
  color:var(--text-2);
  border-bottom:1px solid var(--line);
  padding-bottom:2px;
}
.cta-text-link:hover{color:var(--brand);border-color:var(--line-h);}
/* ===================== FAQ ===================== */
.faq-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
  align-items:start;
}
.faq-item{
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--inset);
  overflow:hidden;
  transition:border-color .2s var(--ease);
}
.faq-item.is-open{border-color:var(--line-h);}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:22px 24px;
  text-align:left;
  font-size:17px;
  font-weight:600;
  line-height:1.6;
  position:relative;
}
.faq-item.is-open .faq-q::before{
  content:"";
  position:absolute;
  left:0;top:14px;bottom:14px;
  width:3px;
  border-radius:0 3px 3px 0;
  background:var(--brand);
}
.faq-sign{
  position:relative;
  width:18px;height:18px;
  flex-shrink:0;
}
.faq-sign::before,.faq-sign::after{
  content:"";
  position:absolute;
  background:var(--brand);
  border-radius:2px;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.faq-sign::before{top:8px;left:0;width:18px;height:1.6px;}
.faq-sign::after{left:8px;top:0;width:1.6px;height:18px;}
.faq-item.is-open .faq-sign::after{transform:scaleY(0);opacity:0;}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .28s var(--ease);
}
.faq-a p{
  padding:0 24px 24px;
  font-size:15px;
  line-height:1.85;
  color:var(--text-2);
}
/* ===================== 页脚 ===================== */
.site-footer{
  border-top:1px solid var(--line);
  background:var(--bg-2);
  padding:72px 0 32px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:48px;
}
.footer-brand .brand{margin-bottom:18px;}
.footer-brand p{
  font-size:14px;
  color:var(--text-2);
  line-height:1.9;
  max-width:320px;
  margin-bottom:22px;
}
.footer-social{display:flex;gap:12px;}
.footer-social a{
  width:38px;height:38px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-3);
}
.footer-social a:hover{border-color:var(--line-h);color:var(--brand);transform:translateY(-2px);}
.footer-social svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:1.6;}
.footer-col h3{
  font-size:15px;
  font-weight:600;
  margin-bottom:18px;
  letter-spacing:.02em;
}
.footer-col li{margin-bottom:12px;}
.footer-col a{
  font-size:14px;
  color:var(--text-2);
  display:inline-block;
}
.footer-col a:hover{color:var(--brand);transform:translateX(2px);}
.footer-bottom{
  margin-top:56px;
  padding-top:24px;
  border-top:1px solid var(--line-2);
  display:flex;
  flex-wrap:wrap;
  gap:16px 32px;
  align-items:center;
  justify-content:space-between;
  font-size:13px;
  color:var(--text-3);
}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:20px;}
.footer-bottom a:hover{color:var(--brand);}
/* ===================== 移动端粘性条 ===================== */
.mobile-bar{
  position:fixed;
  left:0;right:0;bottom:0;
  height:64px;
  z-index:90;
  display:none;
  align-items:center;
  gap:12px;
  padding:0 16px;
  background:rgba(7,11,20,.88);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-top:1px solid var(--line);
  transform:translateY(100%);
  transition:transform .24s var(--ease);
}
.mobile-bar.is-visible{transform:translateY(0);}
.mobile-bar .icon-btn{
  width:44px;height:44px;
  border-radius:var(--r-pill);
  border:1px solid var(--line-h);
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;
}
.mobile-bar .icon-btn svg{width:19px;height:19px;stroke:var(--brand);fill:none;stroke-width:1.7;}
.mobile-bar .btn{flex:1;height:44px;}
/* ===================== 响应式 ===================== */
@media (max-width:1439px){
  .container{padding:0 24px;}
}
@media (max-width:1199px){
  .section{padding:84px 0;}
  .hero{padding:150px 0 96px;}
  .hero-grid{gap:44px;}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:36px;}
}
@media (max-width:991px){
  .main-nav{
    position:fixed;
    inset:76px 0 0 0;
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding:28px 24px 32px;
    background:rgba(7,11,20,.98);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    transform:translateY(-12px);
    opacity:0;
    visibility:hidden;
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
    overflow-y:auto;
    overscroll-behavior:contain;
    margin-left:0;
  }
  .main-nav.is-open{opacity:1;visibility:visible;transform:translateY(0);}
  .nav-link{
    width:100%;
    font-size:20px;
    padding:18px 0;
    border-bottom:1px solid var(--line-2);
  }
  .nav-link::after{display:none;}
  .nav-link.is-active::before{left:0;right:auto;width:22px;bottom:14px;}
  .nav-actions .btn{display:none;}
  .nav-toggle{display:flex;}
  .hero-grid{grid-template-columns:1fr;gap:48px;}
  .hero-media{justify-self:start;max-width:320px;}
  .section-head{flex-direction:column;align-items:flex-start;gap:14px;}
  .post-grid{grid-template-columns:repeat(2,1fr);}
  .faq-grid{grid-template-columns:1fr;}
  .cta-panel{flex-direction:column;align-items:flex-start;padding:36px 28px;}
  .mobile-bar{display:flex;}
}
@media (max-width:767px){
  body{font-size:16px;}
  .container{padding:0 20px;}
  .section{padding:56px 0;}
  .hero{padding:126px 0 64px;}
  .hero-stats{gap:26px;}
  .hero-stat b{font-size:20px;}
  .slider-card{flex:0 0 78vw;}
  .slider-fade{width:36px;}
  .post-grid{grid-template-columns:1fr;}
  .pick-item{grid-template-columns:44px 1fr auto;gap:14px;padding:22px 8px;}
  .pick-num{font-size:14px;color:var(--gold);}
  .review-card{flex:0 0 84vw;}
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .footer-col{padding-top:24px;border-top:1px solid var(--line-2);}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .site-footer{padding-bottom:96px;}
}
@media (max-width:520px){
  .hero h1{font-size:28px;}
  .hero-cta .btn{width:100%;}
  .cta-actions{width:100%;}
  .cta-actions .btn{width:100%;}
  .slider-card{flex:0 0 84vw;}
  .site-header{height:64px;}
  .main-nav{inset:64px 0 0 0;}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
  html{scroll-behavior:auto;}
  .hero-play{animation:none;}
}

/* roulang page: category1 */
:root{
  --bg:#070B14;
  --bg-2:#0C1322;
  --bg-3:#101A2C;
  --primary:#3FD9C8;
  --primary-hover:#5FE7D8;
  --primary-active:#2AB8AA;
  --primary-deep:#0F6E66;
  --gold:#F2B872;
  --link:#4C8CFF;
  --ok:#46D39A;
  --err:#F2607A;
  --text:#EAF1F8;
  --text-2:#A7B6C8;
  --text-3:#6B7C93;
  --on-primary:#04120F;
  --border:rgba(255,255,255,.08);
  --line:rgba(255,255,255,.05);
  --border-hover:rgba(63,217,200,.35);
  --glass:rgba(18,28,46,.55);
  --r-lg:20px;
  --r-md:16px;
  --r-sm:14px;
  --r-media:24px;
  --r-pill:999px;
  --r-input:12px;
  --shadow:0 20px 40px -20px rgba(0,0,0,.6);
  --glow:0 12px 40px -12px rgba(63,217,200,.45);
  --inset:inset 0 1px 0 rgba(255,255,255,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font: "Noto Sans SC","HarmonyOS Sans","PingFang SC","Microsoft YaHei",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(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16.5px;
  line-height:1.9;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body.nav-open{overflow:hidden}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,p,ul,figure{margin:0}
ul{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}
::selection{background:rgba(63,217,200,.28)}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}
.section{padding:clamp(56px,7.5vw,112px) 0;position:relative}
.section-alt{background:var(--bg-2)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:40px}
.section-title{font-size:clamp(23px,2.4vw,34px);font-weight:700;line-height:1.35;letter-spacing:.01em}
.section-desc{margin-top:12px;color:var(--text-2);font-size:15.5px;line-height:1.8;max-width:640px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.14em;color:var(--primary);text-transform:uppercase;font-weight:600}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--primary);opacity:.7}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(7,11,20,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:background .22s var(--ease),border-color .22s var(--ease);
}
.site-header.is-scrolled{background:rgba(7,11,20,.92);border-bottom-color:var(--border)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:26px;height:26px;border-radius:8px;
  background:radial-gradient(circle at 30% 30%,var(--primary-hover),var(--primary-deep) 70%);
  box-shadow:0 0 0 1px rgba(63,217,200,.45),0 8px 22px -10px rgba(63,217,200,.75);
  position:relative;
}
.brand-mark::after{content:"";position:absolute;inset:7px;border-radius:4px;border:1px solid rgba(4,18,15,.55)}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.04em;color:var(--text);white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:32px}
.nav-link{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:6px 0;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;left:0;right:0;bottom:-6px;height:2px;
  background:linear-gradient(90deg,var(--primary),transparent);
  transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::before{
  content:"";position:absolute;left:50%;bottom:-14px;width:4px;height:4px;border-radius:50%;
  background:var(--primary);transform:translateX(-50%);opacity:.9;
}
.nav-link.is-active{color:var(--primary);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}
.nav-toggle{
  display:none;width:40px;height:40px;border-radius:12px;
  border:1px solid var(--border);align-items:center;justify-content:center;position:relative;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:2px;background:var(--text);border-radius:2px;
  transition:transform .22s var(--ease),opacity .18s var(--ease);
}
.nav-toggle span::before{position:absolute;transform:translateY(-6px)}
.nav-toggle span::after{position:absolute;transform:translateY(6px)}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:rotate(-45deg)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.03em;
  padding:13px 26px;
  transition:transform .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease),box-shadow .2s var(--ease),color .18s var(--ease);
  white-space:nowrap;
}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-primary{
  background:linear-gradient(180deg,var(--primary-hover),var(--primary));
  color:var(--on-primary);
  box-shadow:var(--glow),var(--inset);
}
.btn-primary:hover{background:linear-gradient(180deg,#79F0E1,var(--primary-hover));transform:translateY(-2px)}
.btn-primary:active{background:var(--primary-active);transform:translateY(0)}
.btn-ghost{
  border:1px solid rgba(63,217,200,.55);
  color:var(--primary);
  background:transparent;
}
.btn-ghost:hover{border-color:var(--primary);background:rgba(63,217,200,.10);color:var(--primary-hover);transform:translateY(-2px)}
.btn-ghost:active{background:rgba(63,217,200,.16);transform:translateY(0)}
.btn-text{color:var(--primary);padding:8px 0;font-weight:600}
.btn-text::after{content:"→";margin-left:6px;transition:transform .2s var(--ease);display:inline-block}
.btn-text:hover{color:var(--primary-hover)}
.btn-text:hover::after{transform:translateX(4px)}

/* ============ 标签 / 徽章 ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;letter-spacing:.06em;font-weight:600;
  padding:6px 14px;border-radius:var(--r-pill);
  background:rgba(63,217,200,.10);
  border:1px solid rgba(63,217,200,.30);
  color:var(--primary);
}
.badge-gold{background:rgba(242,184,114,.10);border-color:rgba(242,184,114,.35);color:var(--gold)}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 20px;border-radius:var(--r-pill);
  background:var(--glass);border:1px solid var(--border);
  font-size:14.5px;color:var(--text-2);
  backdrop-filter:blur(14px);
  transition:border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.chip:hover{border-color:var(--border-hover);color:var(--text);transform:translateY(-2px)}

/* ============ 面包屑 ============ */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:22px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-3);transition:color .18s var(--ease)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{opacity:.5}
.breadcrumb .current{color:var(--primary)}

/* ============ 页面横幅 ============ */
.page-banner{
  position:relative;
  overflow:hidden;
  padding:52px 0 44px;
  min-height:clamp(320px,34vw,380px);
  display:flex;align-items:flex-end;
  background:
    linear-gradient(100deg,rgba(7,11,20,.94) 0%,rgba(7,11,20,.72) 48%,rgba(7,11,20,.42) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom:1px solid var(--line);
}
.page-banner::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:120px;
  background:linear-gradient(to top,var(--bg),rgba(7,11,20,0));
  pointer-events:none;
}
.page-banner::before{
  content:"";position:absolute;top:-140px;left:-80px;width:40vw;height:40vw;max-width:520px;max-height:520px;
  background:radial-gradient(circle,rgba(63,217,200,.26),transparent 68%);
  filter:blur(120px);pointer-events:none;
}
.banner-inner{position:relative;z-index:2;width:100%}
.page-banner h1{
  font-size:clamp(30px,4.2vw,50px);
  font-weight:800;line-height:1.25;letter-spacing:.01em;
  margin:16px 0 14px;
  max-width:18em;
}
.page-banner h1 .accent{color:var(--primary)}
.banner-sub{font-size:17px;color:var(--text-2);max-width:640px;line-height:1.85}
.banner-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.banner-stats{display:flex;flex-wrap:wrap;gap:40px;margin-top:34px;padding-top:22px;border-top:1px solid var(--line)}
.stat{min-width:110px}
.stat-num{font-size:22px;font-weight:700;color:var(--text);letter-spacing:.04em;font-variant-numeric:tabular-nums}
.stat-num em{font-style:normal;color:var(--gold)}
.stat-label{font-size:13px;color:var(--text-3);letter-spacing:.04em;margin-top:2px}

/* ============ 竖屏卡片网格 ============ */
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.pcard{
  background:var(--glass);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:16px;
  backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow),var(--inset);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .22s var(--ease);
  display:flex;flex-direction:column;
}
.pcard:hover{transform:translateY(-4px);border-color:var(--border-hover);box-shadow:var(--glow),var(--shadow),var(--inset)}
.pcard-media{
  position:relative;border-radius:var(--r-media);overflow:hidden;
  aspect-ratio:9/16;background:var(--bg-3);
}
.pcard-media img{width:100%;height:100%;object-fit:cover;transform:scale(1);transition:transform .3s var(--ease)}
.pcard:hover .pcard-media img{transform:scale(1.04)}
.pcard-media::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:38%;
  background:linear-gradient(to top,rgba(7,11,20,.85),transparent);
}
.pcard-tag{
  position:absolute;top:12px;left:12px;z-index:2;
  display:inline-flex;align-items:center;
  padding:5px 12px;border-radius:var(--r-pill);
  font-size:12px;font-weight:600;letter-spacing:.06em;
  background:rgba(18,28,46,.62);
  border:1px solid rgba(255,255,255,.18);
  color:var(--primary);
  backdrop-filter:blur(12px);
}
.pcard-body{padding:18px 6px 8px}
.pcard-body h3{font-size:19px;font-weight:600;line-height:1.5;margin-bottom:8px}
.pcard-body p{font-size:15px;color:var(--text-2);line-height:1.85}
.pcard-foot{
  margin-top:auto;padding:14px 6px 4px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--text-3);letter-spacing:.04em;
}
.pcard-foot .dot{width:6px;height:6px;border-radius:50%;background:var(--gold);display:inline-block;margin-right:8px;vertical-align:middle}

/* ============ 5:7 图文分栏 ============ */
.split{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center}
.split-rev{grid-template-columns:7fr 5fr}
.split-title{font-size:clamp(22px,2.2vw,30px);font-weight:700;line-height:1.4;margin-bottom:16px}
.split-text{color:var(--text-2);font-size:16px;line-height:1.9}
.prep-list{margin-top:26px}
.prep-item{
  display:flex;gap:16px;align-items:flex-start;
  padding:18px 4px;border-bottom:1px solid var(--line);
  transition:transform .2s var(--ease),background .2s var(--ease);
}
.prep-item:first-child{border-top:1px solid var(--line)}
.prep-item:hover{transform:translateX(6px)}
.prep-index{
  font-size:14px;font-weight:700;color:var(--gold);letter-spacing:.08em;
  font-variant-numeric:tabular-nums;line-height:1.9;min-width:28px;
}
.prep-item h3{font-size:16.5px;font-weight:600;line-height:1.7}
.prep-item p{font-size:14.5px;color:var(--text-3);line-height:1.8;margin-top:2px}
.media-frame{
  position:relative;border-radius:var(--r-media);overflow:hidden;
  border:1px solid var(--border);
  box-shadow:var(--shadow),var(--inset);
  aspect-ratio:4/5;background:var(--bg-3);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(200deg,rgba(7,11,20,.05),rgba(7,11,20,.55));
}
.media-note{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:16px 20px;font-size:13px;color:var(--text-2);
  background:linear-gradient(to top,rgba(7,11,20,.92),transparent);
}

/* ============ FAQ ============ */
.faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.faq-item{
  background:var(--glass);border:1px solid var(--border);border-radius:var(--r-sm);
  backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--inset);
  overflow:hidden;
  transition:border-color .2s var(--ease),box-shadow .22s var(--ease);
}
.faq-item.is-open{border-color:var(--border-hover);box-shadow:inset 3px 0 0 var(--primary),var(--inset)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  text-align:left;padding:18px 20px;
  font-size:17px;font-weight:600;line-height:1.6;color:var(--text);
  transition:color .18s var(--ease);
}
.faq-q:hover{color:var(--primary)}
.faq-icon{position:relative;width:16px;height:16px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--primary);border-radius:2px;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.faq-icon::before{left:0;top:7px;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px}
.faq-item.is-open .faq-icon::after{transform:scaleY(0);opacity:0}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s var(--ease)}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-a-inner{overflow:hidden}
.faq-a p{padding:0 20px 20px;font-size:15px;line-height:1.8;color:var(--text-2)}

/* ============ 交叉链接 ============ */
.cross-links{display:flex;flex-wrap:wrap;gap:14px;margin-top:8px}

/* ============ CTA ============ */
.cta-panel{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px;
  padding:38px 40px;
  border-radius:var(--r-lg);
  background:var(--glass);
  border:1px solid rgba(63,217,200,.22);
  backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--glow),var(--shadow),var(--inset);
  position:relative;overflow:hidden;
}
.cta-panel::before{
  content:"";position:absolute;right:-120px;top:-120px;width:340px;height:340px;
  background:radial-gradient(circle,rgba(63,217,200,.22),transparent 70%);
  filter:blur(90px);pointer-events:none;
}
.cta-text{position:relative;z-index:2;max-width:560px}
.cta-text h2{font-size:clamp(21px,2vw,27px);font-weight:700;line-height:1.4}
.cta-text p{margin-top:10px;color:var(--text-2);font-size:15px;line-height:1.85}
.cta-actions{position:relative;z-index:2;display:flex;align-items:center;gap:18px;flex-wrap:wrap}

/* ============ 页脚 ============ */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding:72px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:52px}
.footer-brand p{margin-top:18px;color:var(--text-3);font-size:14.5px;line-height:1.85;max-width:340px}
.footer-social{display:flex;gap:12px;margin-top:22px}
.footer-social a{
  width:38px;height:38px;border-radius:12px;
  border:1px solid var(--border);
  display:inline-flex;align-items:center;justify-content:center;
  transition:border-color .2s var(--ease),transform .2s var(--ease),color .2s var(--ease);
  color:var(--text-2);
}
.footer-social a:hover{border-color:var(--border-hover);color:var(--primary);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}
.footer-col h3{font-size:15px;font-weight:600;color:var(--text);margin-bottom:18px;letter-spacing:.04em}
.footer-col li{margin-bottom:12px}
.footer-col a{font-size:14.5px;color:var(--text-3);transition:color .18s var(--ease),transform .18s var(--ease);display:inline-block}
.footer-col a:hover{color:var(--primary);transform:translateX(2px)}
.footer-bottom{
  border-top:1px solid var(--line);
  padding:22px 0 30px;
  display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;
  font-size:13px;color:var(--text-3);
}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px;align-items:center}
.footer-legal a{color:var(--text-3);transition:color .18s var(--ease)}
.footer-legal a:hover{color:var(--primary)}

/* ============ 响应式 ============ */
@media (max-width:1439px){
  .container{max-width:1180px}
}
@media (max-width:1199px){
  .nav-link{gap:0}
  .main-nav{gap:24px}
  .grid-3{gap:20px}
  .split{gap:36px}
}
@media (max-width:991px){
  .nav-wrap{height:68px}
  .main-nav{
    position:absolute;top:100%;left:0;right:0;
    height:calc(100vh - 68px);
    overflow-y:auto;
    display:none;flex-direction:column;align-items:flex-start;gap:6px;
    padding:34px 24px 48px;
    background:rgba(7,11,20,.97);
    backdrop-filter:blur(18px) saturate(140%);
    border-top:1px solid var(--line);
  }
  .main-nav.is-open{display:flex}
  .main-nav.is-open .nav-link{
    font-size:20px;color:var(--text);padding:14px 0;width:100%;
    opacity:0;transform:translateY(8px);
    animation:fadeUp .24s var(--ease) forwards;
  }
  .main-nav.is-open .nav-link:nth-child(1){animation-delay:.04s}
  .main-nav.is-open .nav-link:nth-child(2){animation-delay:.08s}
  .main-nav.is-open .nav-link:nth-child(3){animation-delay:.12s}
  .main-nav.is-open .nav-link:nth-child(4){animation-delay:.16s}
  .main-nav.is-open .nav-link:nth-child(5){animation-delay:.2s}
  .nav-link::after{bottom:6px}
  .nav-link:hover::before{display:none}
  .nav-toggle{display:inline-flex}
  .nav-actions .btn-ghost{display:none}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split,.split-rev{grid-template-columns:1fr;gap:32px}
  .split .media-frame{max-width:420px}
  .faq-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px}
  .section{padding:72px 0}
  .cta-panel{padding:30px 26px}
}
@media (max-width:767px){
  .container{padding:0 20px}
  body{font-size:16px;line-height:1.85}
  .section{padding:56px 0}
  .section-head{margin-bottom:28px}
  .page-banner{padding:40px 0 34px;min-height:auto}
  .page-banner h1{max-width:none}
  .banner-actions .btn{flex:1 1 auto}
  .banner-stats{gap:26px}
  .grid-3{grid-template-columns:1fr;gap:18px}
  .pcard-media{aspect-ratio:16/11}
  .footer-grid{grid-template-columns:1fr;gap:30px;padding-bottom:38px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
}
@media (max-width:479px){
  .container{padding:0 16px}
  .page-banner h1{font-size:27px}
  .banner-stats{gap:18px;flex-direction:column}
  .stat{min-width:0}
  .chip{padding:9px 16px;font-size:13.5px}
}

@keyframes fadeUp{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}
}

/* roulang page: article */
:root{
  --bg:#070B14;
  --bg-2:#0C1322;
  --bg-3:#101A2C;
  --brand:#3FD9C8;
  --brand-hover:#5FE7D8;
  --brand-active:#2AB8AA;
  --brand-deep:#0F6E66;
  --gold:#F2B872;
  --link:#4C8CFF;
  --ok:#46D39A;
  --err:#F2607A;
  --text:#EAF1F8;
  --text-2:#A7B6C8;
  --text-3:#6B7C93;
  --on-brand:#04120F;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.05);
  --line-hover:rgba(63,217,200,.35);
  --glass:rgba(18,28,46,.55);
  --r-lg:20px;
  --r-md:14px;
  --r-media:24px;
  --r-pill:999px;
  --r-input:12px;
  --sh:0 20px 40px -20px rgba(0,0,0,.6);
  --sh-glow:0 12px 40px -12px rgba(63,217,200,.45);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
  --gutter:24px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Noto Sans SC","HarmonyOS Sans","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure{margin:0}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
::selection{background:rgba(63,217,200,.28);color:#fff}
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--brand);color:var(--on-brand);
  padding:10px 18px;border-radius:0 0 12px 0;font-size:14px;font-weight:600;
}
.skip-link:focus{left:0}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 var(--gutter)}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  height:76px;display:flex;align-items:center;
  background:rgba(7,11,20,.72);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-2);
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-header.is-scrolled{background:rgba(7,11,20,.93);border-bottom-color:var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;width:100%}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand-mark{
  width:22px;height:22px;border-radius:8px;flex:none;
  background:linear-gradient(135deg,var(--brand-hover),var(--brand-deep));
  box-shadow:0 0 0 1px rgba(63,217,200,.35),0 8px 20px -8px rgba(63,217,200,.7);
}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.01em;color:var(--text);white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:32px}
.nav-link{
  position:relative;font-size:15px;color:var(--text-2);
  transition:color var(--dur) var(--ease);white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:-9px;width:4px;height:4px;border-radius:50%;
  background:var(--brand);opacity:0;transform:translate(-50%,4px) scale(.5);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{opacity:1;transform:translate(-50%,0) scale(1)}
.nav-link.is-active{color:var(--brand)}
.nav-link.is-active::after{opacity:1;transform:translate(-50%,0) scale(1)}
.nav-actions{display:flex;align-items:center;gap:12px;flex:none}
.nav-toggle{
  display:none;width:40px;height:40px;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:12px;flex:none;
  transition:border-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--line-hover)}
.nav-toggle span{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--text);transition:background var(--dur) var(--ease)}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--text);
  transition:transform var(--dur) var(--ease);
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
body.nav-open .nav-toggle span{background:transparent}
body.nav-open .nav-toggle span::before{transform:translateY(6px) rotate(45deg)}
body.nav-open .nav-toggle span::after{transform:translateY(-6px) rotate(-45deg)}
.drawer-cta{display:none}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn-sm{height:38px;padding:0 18px;font-size:14px}
.btn-primary{
  background:linear-gradient(180deg,var(--brand-hover),var(--brand));
  color:var(--on-brand);box-shadow:var(--sh-glow);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 44px -12px rgba(63,217,200,.62)}
.btn-primary:active{transform:translateY(0);background:var(--brand-active)}
.btn-ghost{border-color:rgba(63,217,200,.45);color:var(--brand);background:transparent}
.btn-ghost:hover{background:rgba(63,217,200,.10);border-color:var(--brand);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(0)}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--brand);
  transition:gap var(--dur) var(--ease),color var(--dur) var(--ease);
}
.link-arrow:hover{gap:10px;color:var(--brand-hover)}

/* ============ 文章头部 ============ */
.post-hero{
  position:relative;overflow:hidden;
  padding:56px 0 44px;
  border-bottom:1px solid var(--line-2);
}
.post-hero::before{
  content:"";position:absolute;inset:0;
  background-image:url("/assets/images/backpic/back-1.webp");
  background-size:cover;background-position:center;
  opacity:.22;
}
.post-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,11,20,.62) 0%,rgba(7,11,20,.92) 62%,var(--bg) 100%);
}
.post-hero .container{position:relative;z-index:2}
.post-hero .glow-a{
  position:absolute;left:-6%;top:-30%;width:40%;height:120%;z-index:1;pointer-events:none;
  background:radial-gradient(circle,rgba(63,217,200,.26) 0%,rgba(63,217,200,0) 68%);
  filter:blur(120px);
}
.post-hero .glow-b{
  position:absolute;right:-4%;bottom:-40%;width:30%;height:110%;z-index:1;pointer-events:none;
  background:radial-gradient(circle,rgba(242,184,114,.12) 0%,rgba(242,184,114,0) 70%);
  filter:blur(120px);
}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;line-height:1.6;color:var(--text-3);
}
.breadcrumb a{color:var(--text-3);transition:color var(--dur) var(--ease)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:rgba(107,124,147,.55)}
.breadcrumb .current{
  color:var(--brand);max-width:360px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.post-kicker{
  display:inline-flex;align-items:center;gap:8px;margin-top:26px;
  padding:6px 14px;border-radius:var(--r-pill);
  font-size:13px;letter-spacing:.04em;color:var(--brand);
  background:rgba(63,217,200,.10);border:1px solid rgba(63,217,200,.28);
}
.kicker-dot{width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 10px rgba(63,217,200,.9)}
.post-title{
  margin:18px 0 20px;max-width:920px;
  font-size:clamp(30px,4.2vw,46px);font-weight:800;line-height:1.25;letter-spacing:.01em;color:var(--text);
  animation:fadeUp 220ms var(--ease) both;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.post-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;
  font-size:13px;line-height:1.6;color:var(--text-3);
}
.post-meta .badge{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--r-pill);
  font-size:12px;letter-spacing:.04em;color:var(--brand);
  background:rgba(63,217,200,.10);border:1px solid rgba(63,217,200,.28);
}
.post-meta .dot{width:4px;height:4px;border-radius:50%;background:rgba(107,124,147,.6)}

/* ============ 正文布局 ============ */
.post-main{padding:72px 0 88px}
.post-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:48px;align-items:start}
.post-main-col{min-width:0}
.post-body{
  max-width:800px;
  font-size:17px;line-height:1.9;color:var(--text-2);
  word-wrap:break-word;overflow-wrap:break-word;
}
.post-body > *:first-child{margin-top:0}
.post-body p{margin:0 0 1.2em}
.post-body h2{
  position:relative;margin:48px 0 16px;padding-left:16px;
  font-size:clamp(23px,2.4vw,30px);font-weight:700;line-height:1.35;letter-spacing:.01em;color:var(--text);
}
.post-body h2::before{
  content:"";position:absolute;left:0;top:.16em;bottom:.16em;width:4px;border-radius:2px;
  background:linear-gradient(180deg,var(--brand),var(--brand-deep));
}
.post-body h3{margin:34px 0 12px;font-size:22px;font-weight:600;line-height:1.45;color:var(--text)}
.post-body h4{margin:26px 0 10px;font-size:18px;font-weight:600;color:var(--text)}
.post-body ul,.post-body ol{margin:0 0 1.2em;padding-left:1.5em}
.post-body ul{list-style:disc}
.post-body ol{list-style:decimal}
.post-body li{margin:0 0 .55em}
.post-body ul li::marker{color:var(--brand)}
.post-body ol li::marker{color:var(--brand);font-weight:600}
.post-body a{color:var(--link);text-decoration:underline;text-underline-offset:3px;transition:color var(--dur) var(--ease)}
.post-body a:hover{color:var(--brand)}
.post-body strong{color:var(--text);font-weight:600}
.post-body blockquote{
  margin:28px 0;padding:18px 22px;
  background:var(--bg-3);border-left:3px solid var(--brand);
  border-radius:0 var(--r-md) var(--r-md) 0;color:var(--text-2);
}
.post-body blockquote p:last-child{margin-bottom:0}
.post-body img{border-radius:16px;margin:28px auto;height:auto}
.post-body figure{margin:28px 0}
.post-body figcaption{margin-top:10px;font-size:13px;line-height:1.6;color:var(--text-3);text-align:center}
.post-body hr{margin:40px 0;border:0;border-top:1px solid var(--line-2)}
.post-body table{
  width:100%;margin:24px 0;border-collapse:collapse;font-size:15px;
  background:var(--bg-3);border:1px solid var(--line);border-radius:12px;overflow:hidden;
}
.post-body th,.post-body td{padding:12px 14px;border-bottom:1px solid var(--line-2);text-align:left}
.post-body th{color:var(--text);font-weight:600;background:rgba(255,255,255,.03)}
.post-body pre{
  margin:24px 0;padding:16px 18px;background:var(--bg-3);
  border:1px solid var(--line);border-radius:12px;overflow-x:auto;
  font-size:14px;line-height:1.7;
}
.post-body code{background:var(--bg-3);padding:2px 6px;border-radius:6px;font-size:.92em;color:var(--brand)}
.post-body pre code{background:none;padding:0;color:var(--text-2)}

/* ============ 空态 ============ */
.empty-state{
  max-width:800px;padding:56px 24px;text-align:center;
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh);
}
.empty-icon{
  width:64px;height:64px;margin:0 auto 18px;border-radius:50%;
  display:grid;place-items:center;color:var(--brand);
  background:rgba(63,217,200,.10);border:1px solid rgba(63,217,200,.22);
}
.empty-icon svg{width:34px;height:34px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.empty-state h2{font-size:22px;font-weight:600;color:var(--text);margin-bottom:10px}
.empty-state p{font-size:15px;color:var(--text-3);margin-bottom:24px}

/* ============ 标签 ============ */
.post-tags{display:flex;flex-wrap:wrap;gap:10px;margin:48px 0 0;max-width:800px}
.tag{
  display:inline-flex;align-items:center;height:34px;padding:0 16px;border-radius:var(--r-pill);
  font-size:13px;color:var(--text-2);background:rgba(255,255,255,.03);border:1px solid var(--line);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
a.tag:hover{color:var(--brand);border-color:var(--line-hover);background:rgba(63,217,200,.08);transform:translateY(-2px)}
.tag.is-key{color:var(--brand);border-color:rgba(63,217,200,.32);background:rgba(63,217,200,.08)}

/* ============ 相关推荐 ============ */
.related{margin-top:72px;padding-top:48px;border-top:1px solid var(--line-2)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:24px}
.sec-head h2{font-size:clamp(23px,2.4vw,30px);font-weight:700;line-height:1.35;letter-spacing:.01em;color:var(--text)}
.sec-head p{margin-top:8px;font-size:14px;color:var(--text-3)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.rec-card{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.06);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.rec-card:hover{transform:translateY(-4px);border-color:var(--line-hover);box-shadow:var(--sh-glow),inset 0 1px 0 rgba(255,255,255,.06)}
.rec-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--bg-3)}
.rec-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 240ms var(--ease)}
.rec-card:hover .rec-thumb img{transform:scale(1.04)}
.rec-badge{
  position:absolute;left:12px;top:12px;height:26px;padding:0 12px;
  display:inline-flex;align-items:center;border-radius:var(--r-pill);
  font-size:12px;letter-spacing:.04em;color:var(--text);
  background:rgba(7,11,20,.62);border:1px solid var(--line);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.rec-body{padding:18px 20px 22px}
.rec-body h3{font-size:17px;font-weight:600;line-height:1.5;color:var(--text);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rec-body p{margin-top:8px;font-size:14px;line-height:1.7;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rec-foot{margin-top:14px;font-size:13px;color:var(--text-3)}

/* ============ 上下篇 / 返回 ============ */
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:36px;max-width:800px}
.post-nav a{
  display:flex;flex-direction:column;gap:6px;padding:18px 20px;
  background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:var(--r-md);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.post-nav a:hover{border-color:var(--line-hover);background:rgba(63,217,200,.06);transform:translateY(-2px)}
.post-nav span{font-size:12px;letter-spacing:.04em;color:var(--text-3)}
.post-nav strong{font-size:15px;font-weight:600;color:var(--text);line-height:1.6}
.post-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}

/* ============ 侧栏 / 折叠块 ============ */
.toc-mobile{display:block;margin-bottom:28px}
.toc-mobile details{
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);border-radius:var(--r-md);padding:14px 16px;
}
.toc-mobile summary{
  display:flex;align-items:center;justify-content:space-between;
  font-size:15px;font-weight:600;color:var(--text);cursor:pointer;list-style:none;
}
.toc-mobile summary::-webkit-details-marker{display:none}
.toc-mobile summary::after{content:"＋";color:var(--brand);font-size:15px}
.toc-mobile details[open] summary::after{content:"－"}
.toc-mobile ul{margin-top:14px;padding-top:14px;border-top:1px solid var(--line-2)}
.toc-mobile li+li{margin-top:10px}
.toc-mobile a{font-size:14px;color:var(--text-2);transition:color var(--dur) var(--ease)}
.toc-mobile a:hover{color:var(--brand)}
.post-aside{display:none}
.aside-card{
  position:sticky;top:100px;padding:22px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.06);
}
.aside-card h2{font-size:15px;font-weight:600;color:var(--text);letter-spacing:.01em}
.aside-card .aside-sub{margin-top:6px;font-size:13px;color:var(--text-3)}
.aside-list{margin-top:18px;border-top:1px solid var(--line-2)}
.aside-list li{border-bottom:1px solid var(--line-2)}
.aside-list a{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 0;font-size:14px;color:var(--text-2);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.aside-list a:hover{color:var(--brand);transform:translateX(2px)}
.aside-list .idx{font-size:12px;letter-spacing:.04em;color:var(--gold)}
.aside-card .btn{width:100%;margin-top:20px}

/* ============ CTA ============ */
.cta-section{padding:0 0 96px}
.cta-panel{
  position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  padding:38px 42px;border-radius:var(--r-media);
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);
  box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.06);
}
.cta-panel::before{
  content:"";position:absolute;right:-8%;top:-120%;width:38%;height:340%;
  background:radial-gradient(circle,rgba(63,217,200,.24) 0%,rgba(63,217,200,0) 68%);
  filter:blur(90px);pointer-events:none;
}
.cta-copy{position:relative;z-index:1;max-width:620px}
.cta-copy h2{font-size:clamp(20px,2vw,26px);font-weight:700;line-height:1.4;color:var(--text)}
.cta-copy p{margin-top:10px;font-size:15px;color:var(--text-3);line-height:1.8}
.cta-actions{position:relative;z-index:1;display:flex;align-items:center;gap:18px;flex:none}

/* ============ 页脚 ============ */
.site-footer{margin-top:0;background:var(--bg-2);border-top:1px solid var(--line-2);padding-top:64px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-brand p{margin-top:16px;max-width:340px;font-size:14px;line-height:1.8;color:var(--text-3)}
.footer-social{display:flex;gap:12px;margin-top:20px}
.footer-social a{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  border:1px solid var(--line);color:var(--text-2);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-social a:hover{color:var(--brand);border-color:var(--line-hover);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}
.footer-col h3{font-size:15px;font-weight:600;color:var(--text);margin-bottom:16px}
.footer-col li+li{margin-top:10px}
.footer-col a{display:inline-block;font-size:14px;color:var(--text-3);transition:color var(--dur) var(--ease),transform var(--dur) var(--ease)}
.footer-col a:hover{color:var(--brand);transform:translateX(2px)}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding:22px 0;border-top:1px solid var(--line-2);
  font-size:13px;line-height:1.7;color:var(--text-3);
}
.footer-note{max-width:520px}
.footer-legal{display:flex;gap:18px}
.footer-legal a{color:var(--text-3);transition:color var(--dur) var(--ease)}
.footer-legal a:hover{color:var(--brand)}

/* ============ 响应式 ============ */
@media (min-width:1200px){
  .post-layout{grid-template-columns:minmax(0,1fr) 300px;gap:64px}
  .post-aside{display:block}
  .toc-mobile{display:none}
}
@media (max-width:1199px){
  .card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:991px){
  :root{--gutter:20px}
  .site-header{height:64px}
  .main-nav{
    position:fixed;left:0;right:0;top:64px;bottom:0;z-index:55;
    flex-direction:column;align-items:stretch;gap:0;
    padding:24px 24px 36px;
    background:rgba(7,11,20,.98);
    -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
    overflow-y:auto;
  }
  body.nav-open .main-nav{opacity:1;visibility:visible;transform:none}
  body.nav-open{overflow:hidden}
  .main-nav .nav-link{
    width:100%;font-size:20px;padding:16px 0;
    border-bottom:1px solid var(--line-2);color:var(--text-2);
  }
  .main-nav .nav-link::after{display:none}
  .main-nav .nav-link.is-active{color:var(--brand)}
  .drawer-cta{display:inline-flex;width:100%;margin-top:28px}
  .nav-actions .btn{display:none}
  .nav-toggle{display:inline-flex}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .post-hero{padding:44px 0 36px}
  .post-main{padding:56px 0 72px}
  .related{margin-top:56px;padding-top:40px}
  .cta-section{padding:0 0 72px}
  .cta-panel{flex-direction:column;align-items:flex-start;padding:30px 26px}
  .cta-actions{width:100%}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:640px){
  .card-grid{grid-template-columns:1fr}
  .post-nav{grid-template-columns:1fr}
  .post-title{font-size:clamp(26px,7vw,32px)}
  .breadcrumb .current{max-width:200px}
  .cta-actions{flex-direction:column;align-items:stretch;gap:12px}
  .cta-actions .btn{width:100%}
  .post-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:480px){
  .brand-text{font-size:16px}
  .post-body{font-size:16px;line-height:1.85}
  .post-body h2{font-size:22px}
  .post-body h3{font-size:19px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .post-title{animation:none}
}

/* roulang page: category3 */
:root{
  --bg:#070B14;
  --bg-2:#0C1322;
  --bg-3:#101A2C;
  --primary:#3FD9C8;
  --primary-hover:#5FE7D8;
  --primary-active:#2AB8AA;
  --primary-deep:#0F6E66;
  --gold:#F2B872;
  --link:#4C8CFF;
  --ok:#46D39A;
  --warn:#F2B872;
  --err:#F2607A;
  --text:#EAF1F8;
  --text-2:#A7B6C8;
  --text-3:#6B7C93;
  --on-primary:#04120F;
  --line:rgba(255,255,255,.08);
  --line-soft:rgba(255,255,255,.05);
  --line-hover:rgba(63,217,200,.35);
  --glass:rgba(18,28,46,.55);
  --r-lg:20px;
  --r-md:14px;
  --r-media:24px;
  --r-input:12px;
  --r-pill:999px;
  --shadow:0 20px 40px -20px rgba(0,0,0,.6);
  --glow:0 12px 40px -12px rgba(63,217,200,.45);
  --inset:inset 0 1px 0 rgba(255,255,255,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font:"Noto Sans SC","HarmonyOS Sans","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16.5px;
  line-height:1.9;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
svg{display:block}
::selection{background:rgba(63,217,200,.28);color:#fff}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}

.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}
.narrow{max-width:800px}
.section{padding:96px 0}
.section--tight{padding:72px 0}
.section--alt{background:var(--bg-2)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px}
.section-head h2{font-size:clamp(23px,2.4vw,34px);font-weight:700;line-height:1.35;letter-spacing:.01em}
.section-head p{color:var(--text-2);font-size:15px;line-height:1.8;max-width:560px;margin-top:10px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.04em;color:var(--primary);
  padding:6px 14px;border-radius:var(--r-pill);
  border:1px solid rgba(63,217,200,.28);
  background:rgba(63,217,200,.08);
  margin-bottom:18px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary);box-shadow:0 0 10px rgba(63,217,200,.9)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  padding:13px 26px;border:1px solid transparent;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
  white-space:nowrap;
}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-primary{background:var(--primary);color:var(--on-primary);box-shadow:var(--glow)}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-2px)}
.btn-primary:active{background:var(--primary-active);transform:translateY(0)}
.btn-ghost{border-color:rgba(63,217,200,.45);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--primary);background:rgba(63,217,200,.10);transform:translateY(-2px)}
.btn-ghost:active{background:rgba(63,217,200,.16);transform:translateY(0)}
.btn-text{color:var(--primary);padding:0;font-size:15px;font-weight:600}
.btn-text:hover{color:var(--primary-hover)}
.btn-block{width:100%}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,11,20,.72);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header.is-scrolled{background:rgba(7,11,20,.92);border-bottom-color:rgba(255,255,255,.14)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:32px;height:76px}
.brand{display:inline-flex;align-items:center;gap:10px}
.brand-mark{
  width:26px;height:26px;flex:0 0 26px;border-radius:9px;
  background:linear-gradient(140deg,var(--primary) 0%,var(--primary-deep) 100%);
  box-shadow:0 0 18px rgba(63,217,200,.45);
  position:relative;
}
.brand-mark::after{
  content:"";position:absolute;inset:7px;border-radius:4px;
  background:rgba(4,18,15,.75);
}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.01em;color:var(--text)}
.main-nav{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;font-size:15px;color:var(--text-2);padding:6px 0;transition:color .2s var(--ease)}
.nav-link::before{
  content:"";position:absolute;left:50%;bottom:-6px;width:4px;height:4px;border-radius:50%;
  background:var(--primary);opacity:0;transform:translate(-50%,4px);
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::before{opacity:1;transform:translate(-50%,0)}
.nav-link.is-active{color:var(--primary)}
.nav-link.is-active::after{
  content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;
  background:linear-gradient(90deg,var(--primary),rgba(63,217,200,0));
}
.nav-actions{display:flex;align-items:center;gap:14px}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line);position:relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after{
  content:"";position:absolute;left:50%;width:18px;height:1.6px;background:var(--text);
  transform:translateX(-50%);transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle span{top:50%;margin-top:-.8px}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle.is-open span{background:transparent}
.nav-toggle.is-open span::before{transform:translateX(-50%) translateY(6px) rotate(45deg)}
.nav-toggle.is-open span::after{transform:translateX(-50%) translateY(-6px) rotate(-45deg)}

/* ---------- hero ---------- */
.hero{position:relative;padding:84px 0 120px;overflow:hidden;background:linear-gradient(180deg,#070B14 0%,#0A1020 100%)}
.hero .glow{position:absolute;border-radius:50%;pointer-events:none;filter:blur(120px)}
.glow-a{width:40vw;height:40vw;left:-8vw;top:-10vw;background:radial-gradient(circle,rgba(63,217,200,.28),transparent 70%)}
.glow-b{width:30vw;height:30vw;right:-6vw;bottom:-14vw;background:radial-gradient(circle,rgba(242,184,114,.12),transparent 70%)}
.hero .grid-tex{
  position:absolute;inset:0;pointer-events:none;opacity:.03;
  background-image:linear-gradient(rgba(255,255,255,.9) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.9) 1px,transparent 1px);
  background-size:56px 56px;
}
.hero-grid{position:relative;display:grid;grid-template-columns:5fr 7fr;gap:52px;align-items:center}
.hero h1{font-size:clamp(30px,4.2vw,54px);font-weight:800;line-height:1.25;letter-spacing:.01em}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero-sub{margin-top:20px;color:var(--text-2);font-size:17px;line-height:1.9;max-width:520px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.stat-row{display:flex;flex-wrap:wrap;gap:40px;margin-top:44px;padding-top:28px;border-top:1px solid var(--line-soft)}
.stat{min-width:96px}
.stat b{display:block;font-size:24px;font-weight:700;color:var(--text);letter-spacing:.04em;font-variant-numeric:tabular-nums}
.stat span{display:block;font-size:13px;color:var(--text-3);line-height:1.6;margin-top:4px}
.media-frame{
  position:relative;width:100%;max-width:420px;margin-left:auto;
  aspect-ratio:9/16;max-height:560px;
  border-radius:var(--r-media);overflow:hidden;
  border:1px solid var(--line);
  background:var(--bg-3);
  box-shadow:var(--shadow),var(--inset);
}
.media-frame img{width:100%;height:100%;object-fit:cover;opacity:.72}
.media-frame::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,11,20,.25) 0%,rgba(7,11,20,.05) 45%,rgba(7,11,20,.92) 100%);
}
.corner{position:absolute;width:22px;height:22px;border:1px solid rgba(63,217,200,.55);z-index:3}
.corner.tl{top:14px;left:14px;border-right:0;border-bottom:0}
.corner.br{bottom:14px;right:14px;border-left:0;border-top:0}
.play-ring{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:64px;height:64px;border-radius:50%;z-index:3;
  border:1px solid rgba(63,217,200,.6);
  background:rgba(63,217,200,.12);
  display:grid;place-items:center;
  animation:pulse 2.6s var(--ease) infinite;
}
.play-ring::before{
  content:"";width:0;height:0;margin-left:4px;
  border-left:14px solid var(--primary);
  border-top:9px solid transparent;
  border-bottom:9px solid transparent;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(63,217,200,.35)}
  70%{box-shadow:0 0 0 22px rgba(63,217,200,0)}
  100%{box-shadow:0 0 0 0 rgba(63,217,200,0)}
}
.media-caption{position:absolute;left:20px;right:20px;bottom:18px;z-index:3;font-size:13px;line-height:1.6;color:var(--text-3)}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--text-3);padding:22px 0 0;
}
.breadcrumb a{color:var(--text-3);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:rgba(255,255,255,.18)}
.breadcrumb .cur{color:var(--primary)}

/* ---------- overview cards ---------- */
.overview-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.ov-card{
  padding:26px 22px;border-radius:var(--r-lg);
  border:1px solid var(--line);background:var(--bg-2);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.ov-card:hover{transform:translateY(-3px);border-color:var(--line-hover);box-shadow:var(--shadow)}
.ov-num{font-size:13px;letter-spacing:.04em;color:var(--gold);font-variant-numeric:tabular-nums}
.ov-card h3{font-size:18px;font-weight:600;margin-top:12px;line-height:1.5}
.ov-card p{font-size:14px;color:var(--text-2);line-height:1.8;margin-top:8px}

/* ---------- flow / timeline ---------- */
.flow-grid{display:grid;grid-template-columns:3fr 9fr;gap:56px;align-items:start}
.flow-aside{position:sticky;top:110px}
.flow-aside h3{font-size:17px;font-weight:600;margin-bottom:20px}
.node-index{border-top:1px solid var(--line-soft)}
.node-index li{border-bottom:1px solid var(--line-soft)}
.node-index a{
  display:flex;align-items:baseline;gap:12px;padding:14px 0;
  font-size:15px;color:var(--text-2);transition:color .2s var(--ease),transform .2s var(--ease);
}
.node-index a:hover{color:var(--primary);transform:translateX(4px)}
.node-index i{font-style:normal;font-size:13px;color:var(--gold);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.aside-note{
  margin-top:28px;padding:20px;border-radius:var(--r-md);
  border:1px solid var(--line);background:var(--bg-3);
  font-size:14px;color:var(--text-2);line-height:1.8;
}
.aside-note strong{color:var(--text);font-weight:600}

.timeline{position:relative;padding-left:2px}
.timeline::before{
  content:"";position:absolute;left:11px;top:10px;bottom:10px;width:1px;
  background:linear-gradient(180deg,rgba(63,217,200,.55),rgba(63,217,200,.06));
}
.tl-item{position:relative;padding:0 0 42px 52px}
.tl-item:last-child{padding-bottom:0}
.tl-node{
  position:absolute;left:0;top:6px;width:23px;height:23px;border-radius:50%;
  border:1px solid var(--line-hover);background:rgba(63,217,200,.10);
  display:grid;place-items:center;
}
.tl-node span{width:9px;height:9px;border-radius:50%;background:var(--primary);box-shadow:0 0 12px rgba(63,217,200,.85)}
.tl-meta{display:flex;align-items:center;gap:12px;font-size:13px;letter-spacing:.04em;color:var(--gold);font-variant-numeric:tabular-nums}
.tl-meta em{font-style:normal;color:var(--text-3);letter-spacing:.01em}
.tl-item h3{font-size:20px;font-weight:600;margin-top:10px;line-height:1.55}
.tl-item p{margin-top:10px;font-size:15.5px;color:var(--text-2);line-height:1.9;max-width:660px}
.tl-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{
  font-size:12px;letter-spacing:.04em;padding:4px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line);color:var(--text-3);background:rgba(255,255,255,.03);
}

/* ---------- device split ---------- */
.split{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center}
.split-media{
  border-radius:var(--r-media);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow);aspect-ratio:4/3;background:var(--bg-3);
}
.split-media img{width:100%;height:100%;object-fit:cover;opacity:.85}
.device-list li{
  padding:22px 0;border-bottom:1px solid var(--line-soft);
  display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start;
}
.device-list li:first-child{padding-top:0}
.device-list li:last-child{border-bottom:0;padding-bottom:0}
.device-list .dot{
  width:10px;height:10px;margin-top:9px;border-radius:50%;
  background:var(--primary);box-shadow:0 0 12px rgba(63,217,200,.7);
}
.device-list h3{font-size:18px;font-weight:600}
.device-list p{font-size:15px;color:var(--text-2);line-height:1.85;margin-top:6px}

/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.faq-item{
  position:relative;border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:rgba(18,28,46,.45);
  box-shadow:var(--inset);
  overflow:hidden;
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.faq-item::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--primary);opacity:0;transition:opacity .2s var(--ease);
}
.faq-item:hover{border-color:var(--line-hover)}
.faq-item.is-open{border-color:var(--line-hover);background:rgba(18,28,46,.66)}
.faq-item.is-open::before{opacity:1}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:22px 24px;text-align:left;font-size:17px;font-weight:600;line-height:1.6;
}
.faq-icon{position:relative;width:16px;height:16px;flex:0 0 16px}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:var(--primary);border-radius:1px;
}
.faq-icon::before{width:14px;height:1.5px}
.faq-icon::after{width:1.5px;height:14px;transition:transform .22s var(--ease)}
.faq-item.is-open .faq-icon::after{transform:translate(-50%,-50%) scaleY(0)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s var(--ease)}
.faq-a p{
  overflow:hidden;margin:0;padding:0 24px;
  font-size:15px;color:var(--text-2);line-height:1.8;
}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-item.is-open .faq-a p{padding-bottom:24px}

/* ---------- cross links ---------- */
.cross{padding-top:8px}
.cross-title{font-size:14px;color:var(--text-3);letter-spacing:.04em;margin-bottom:16px}
.cross-links{display:flex;flex-wrap:wrap;gap:12px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 20px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:rgba(18,28,46,.5);
  font-size:14px;color:var(--text-2);
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.chip:hover{color:var(--primary);border-color:var(--line-hover);transform:translateY(-2px)}
.chip::after{content:"→";color:var(--primary);font-size:13px}

/* ---------- cta ---------- */
.cta-panel{
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  padding:40px 44px;border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:linear-gradient(120deg,rgba(18,28,46,.75),rgba(10,16,32,.75));
  box-shadow:var(--shadow),var(--inset);
  position:relative;overflow:hidden;
}
.cta-panel::before{
  content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(63,217,200,.20),transparent 70%);filter:blur(50px);pointer-events:none;
}
.cta-panel h2{font-size:clamp(21px,2.1vw,27px);font-weight:700;line-height:1.4}
.cta-panel p{color:var(--text-2);font-size:15px;margin-top:10px;max-width:520px;line-height:1.8}
.cta-actions{display:flex;align-items:center;gap:18px;flex:0 0 auto}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding:72px 0 32px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:48px}
.footer-brand p{color:var(--text-2);font-size:14px;line-height:1.9;margin-top:18px;max-width:340px}
.footer-social{display:flex;gap:12px;margin-top:22px}
.footer-social a{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  border:1px solid var(--line);color:var(--text-2);
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.footer-social svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.5}
.footer-social a:hover{color:var(--primary);border-color:var(--line-hover);transform:translateY(-2px)}
.footer-col h3{font-size:15px;font-weight:600;color:var(--text);margin-bottom:18px}
.footer-col li{margin-bottom:12px}
.footer-col a{font-size:14px;color:var(--text-2);transition:color .2s var(--ease),transform .2s var(--ease);display:inline-block}
.footer-col a:hover{color:var(--primary);transform:translateX(2px)}
.footer-bottom{
  margin-top:56px;padding-top:26px;border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  font-size:13px;color:var(--text-3);
}
.footer-bottom-links{display:flex;flex-wrap:wrap;gap:22px}
.footer-bottom-links a{color:var(--text-3);transition:color .2s var(--ease)}
.footer-bottom-links a:hover{color:var(--primary)}

/* ---------- mobile sticky bar ---------- */
.mobile-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:70;height:64px;
  display:none;align-items:center;gap:12px;padding:0 16px;
  background:rgba(12,19,34,.88);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-top:1px solid var(--line);
  transform:translateY(110%);
  transition:transform .24s var(--ease);
}
.mobile-bar.is-visible{transform:translateY(0)}
.mobile-bar .mb-icon{
  width:44px;height:44px;flex:0 0 44px;border-radius:12px;display:grid;place-items:center;
  border:1px solid var(--line);color:var(--primary);
}
.mobile-bar .mb-icon svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}
.mobile-bar .btn{flex:1}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .24s var(--ease),transform .24s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1439px){
  .hero-grid{gap:44px}
}
@media (max-width:1199px){
  .section{padding:84px 0}
  .overview-grid{grid-template-columns:repeat(2,1fr)}
  .flow-grid{grid-template-columns:1fr;gap:36px}
  .flow-aside{position:static}
  .node-index{display:grid;grid-template-columns:repeat(2,1fr);gap:0 24px}
  .node-index li:nth-last-child(-n+1){border-bottom:1px solid var(--line-soft)}
}
@media (max-width:991px){
  .nav-wrap{height:64px}
  .main-nav{
    position:fixed;inset:64px 0 0 0;z-index:55;
    flex-direction:column;align-items:flex-start;gap:0;
    padding:32px 24px 120px;
    background:rgba(7,11,20,.97);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    overflow-y:auto;
    transform:translateY(-8px);
    opacity:0;visibility:hidden;
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
  }
  .main-nav.is-open{opacity:1;visibility:visible;transform:none}
  .main-nav .nav-link{
    width:100%;font-size:20px;padding:16px 0;
    border-bottom:1px solid var(--line-soft);
    opacity:0;transform:translateY(8px);
    animation:navIn .22s var(--ease) forwards;
  }
  .main-nav.is-open .nav-link{animation-play-state:running}
  .main-nav .nav-link:nth-child(1){animation-delay:.04s}
  .main-nav .nav-link:nth-child(2){animation-delay:.08s}
  .main-nav .nav-link:nth-child(3){animation-delay:.12s}
  .main-nav .nav-link:nth-child(4){animation-delay:.16s}
  .main-nav .nav-link:nth-child(5){animation-delay:.2s}
  .nav-link::before{display:none}
  .nav-link.is-active::after{left:0;right:auto;width:48px;bottom:12px}
  .nav-toggle{display:block}
  .nav-actions .btn{display:none}
  @keyframes navIn{to{opacity:1;transform:none}}
  .hero{padding:64px 0 84px}
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-sub{max-width:none}
  .media-frame{max-width:340px;margin:0 auto;max-height:480px}
  .stat-row{gap:28px}
  .split{grid-template-columns:1fr;gap:32px}
  .split-media{aspect-ratio:16/9}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
  .cta-panel{flex-direction:column;align-items:flex-start;padding:34px 28px}
  .cta-actions{width:100%;flex-wrap:wrap}
  .mobile-bar{display:flex}
  .site-footer{padding-bottom:96px}
}
@media (max-width:767px){
  body{font-size:16px}
  .container{padding:0 20px}
  .section{padding:56px 0}
  .section--tight{padding:48px 0}
  .section-head{flex-direction:column;align-items:flex-start;margin-bottom:32px}
  .overview-grid{grid-template-columns:1fr;gap:16px}
  .faq-grid{grid-template-columns:1fr}
  .timeline::before{left:9px}
  .tl-item{padding-left:42px;padding-bottom:34px}
  .tl-node{width:19px;height:19px}
  .tl-node span{width:7px;height:7px}
  .node-index{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:34px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:12px}
  .cta-actions .btn{width:100%}
  .hero-cta .btn{width:100%}
}
@media (max-width:479px){
  .hero{padding:48px 0 64px}
  .stat-row{gap:20px;margin-top:32px}
  .stat{min-width:80px}
  .stat b{font-size:20px}
  .media-frame{max-width:100%;max-height:420px}
  .faq-q{padding:18px 18px;font-size:16px}
  .faq-a p{padding:0 18px}
  .faq-item.is-open .faq-a p{padding-bottom:18px}
  .cta-panel{padding:26px 20px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category2 */
:root{
  --bg:#070B14;
  --bg-2:#0C1322;
  --bg-3:#101A2C;
  --primary:#3FD9C8;
  --primary-hover:#5FE7D8;
  --primary-active:#2AB8AA;
  --primary-deep:#0F6E66;
  --gold:#F2B872;
  --link:#4C8CFF;
  --success:#46D39A;
  --error:#F2607A;
  --text:#EAF1F8;
  --text-2:#A7B6C8;
  --text-3:#6B7C93;
  --on-primary:#04120F;
  --line:rgba(255,255,255,.08);
  --divider:rgba(255,255,255,.05);
  --line-hover:rgba(63,217,200,.35);
  --glass:rgba(18,28,46,.55);
  --r-lg:20px;
  --r-sm:14px;
  --r-media:24px;
  --r-pill:999px;
  --r-input:12px;
  --sh:0 20px 40px -20px rgba(0,0,0,.6);
  --sh-glow:0 12px 40px -12px rgba(63,217,200,.45);
  --inset:inset 0 1px 0 rgba(255,255,255,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
  --sp:104px;
  --font:'Noto Sans SC','HarmonyOS Sans','PingFang SC','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-num:'Inter','DIN Alternate','HarmonyOS Sans',system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);font-size:16.5px;line-height:1.9;font-weight:400;
  letter-spacing:.01em;overflow-x:hidden;
  padding-bottom:0;
}
body.no-scroll{overflow:hidden}
body::before{
  content:'';position:fixed;top:-12%;left:-8%;width:44vw;height:44vw;max-width:660px;max-height:660px;
  background:radial-gradient(circle,rgba(63,217,200,.28),transparent 66%);
  filter:blur(120px);pointer-events:none;z-index:0;
}
body::after{
  content:'';position:fixed;right:-10%;bottom:-14%;width:34vw;height:34vw;max-width:560px;max-height:560px;
  background:radial-gradient(circle,rgba(242,184,114,.12),transparent 66%);
  filter:blur(120px);pointer-events:none;z-index:0;
}
.grid-texture{
  position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.42;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:64px 64px;
}
h1,h2,h3,h4{margin:0;letter-spacing:.01em}
h1{font-size:clamp(30px,4.2vw,54px);line-height:1.25;font-weight:800}
h2{font-size:clamp(23px,2.4vw,34px);line-height:1.35;font-weight:700}
h3{font-size:20px;line-height:1.5;font-weight:600}
p{margin:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{list-style:none;margin:0;padding:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
svg{display:block}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}
::selection{background:rgba(63,217,200,.3);color:#fff}

.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}

/* ---------- 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 26px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.02em;white-space:nowrap;
  border:1px solid transparent;cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.btn-primary{background:var(--primary);color:var(--on-primary);box-shadow:var(--sh-glow)}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-2px)}
.btn-primary:active{background:var(--primary-active);transform:translateY(0)}
.btn-ghost{border-color:rgba(63,217,200,.42);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary);background:rgba(63,217,200,.08);transform:translateY(-2px)}
.btn-ghost:active{background:rgba(63,217,200,.14);transform:translateY(0)}
.btn-sm{height:38px;padding:0 18px;font-size:14px}
.btn-block{width:100%}
.badge{
  display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 14px;
  border-radius:var(--r-pill);font-size:12px;letter-spacing:.04em;
  color:var(--primary);border:1px solid rgba(63,217,200,.35);background:rgba(63,217,200,.08);
}
.badge::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--primary);box-shadow:0 0 10px rgba(63,217,200,.85)}
.text-link{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--text-2);
  border-bottom:1px solid rgba(255,255,255,.16);padding-bottom:2px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.text-link:hover{color:var(--primary);border-color:var(--line-hover)}
.eyebrow{
  display:inline-block;font-family:var(--font-num);font-size:12px;font-weight:600;
  letter-spacing:.16em;color:var(--gold);margin-bottom:14px;
}
.hl{color:var(--primary)}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;height:76px;display:flex;align-items:center;
  background:rgba(7,11,20,.72);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--divider);
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-header.is-scrolled{background:rgba(7,11,20,.94);border-bottom-color:var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;width:100%}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:26px;height:26px;border-radius:9px;
  background:radial-gradient(circle at 32% 28%,var(--primary),var(--primary-deep));
  box-shadow:0 6px 18px -6px rgba(63,217,200,.8);
}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.02em;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:8px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  font-size:15px;color:var(--text-2);padding:8px 14px;border-radius:var(--r-pill);
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-link::after{
  content:'';position:absolute;left:50%;bottom:2px;width:4px;height:4px;border-radius:50%;
  background:var(--primary);opacity:0;transform:translateX(-50%) scale(.4);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{opacity:.75;transform:translateX(-50%) scale(1)}
.nav-link.is-active{color:var(--primary);background:rgba(63,217,200,.10)}
.nav-link.is-active::after{opacity:0}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line);align-items:center;justify-content:center;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--line-hover);background:rgba(63,217,200,.08)}
.nav-toggle span{position:relative;display:block;width:20px;height:2px;border-radius:2px;background:var(--text);transition:background var(--dur) var(--ease)}
.nav-toggle span::before,.nav-toggle span::after{
  content:'';position:absolute;left:0;width:20px;height:2px;border-radius:2px;background:var(--text);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  position:relative;z-index:1;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  font-size:13px;color:var(--text-3);padding-top:30px;
}
.breadcrumb a{transition:color var(--dur) var(--ease)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:rgba(255,255,255,.22)}
.breadcrumb .current{color:var(--primary)}

/* ---------- 主体 ---------- */
main{position:relative;z-index:1}

/* ---------- Hero ---------- */
.hero{padding:68px 0 32px}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center}
.hero-copy h1{margin-top:22px;max-width:660px}
.hero-sub{margin-top:20px;font-size:17px;line-height:1.85;color:var(--text-2);max-width:540px}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:34px}
.hero-stats{
  display:flex;flex-wrap:wrap;gap:44px;margin-top:46px;padding-top:26px;border-top:1px solid var(--divider);
}
.stat{display:flex;flex-direction:column;gap:4px}
.stat-num{font-family:var(--font-num);font-size:22px;font-weight:700;letter-spacing:.04em}
.stat-label{font-size:13px;color:var(--text-3)}
.hero-media{display:flex;justify-content:flex-end}
.media-frame{
  position:relative;height:560px;aspect-ratio:9/16;max-width:100%;
  border-radius:var(--r-media);overflow:hidden;margin:0;
  border:1px solid var(--line);background:var(--bg-2);box-shadow:var(--sh),var(--inset);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::before{
  content:'';position:absolute;top:14px;left:14px;width:26px;height:26px;
  border-left:1px solid rgba(255,255,255,.42);border-top:1px solid rgba(255,255,255,.42);border-radius:8px 0 0 0;
}
.media-frame::after{
  content:'';position:absolute;bottom:14px;right:14px;width:26px;height:26px;
  border-right:1px solid rgba(255,255,255,.42);border-bottom:1px solid rgba(255,255,255,.42);border-radius:0 0 8px 0;
}
.play-ring{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:64px;height:64px;border-radius:50%;
  border:1px solid rgba(255,255,255,.5);background:rgba(18,28,46,.5);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;
}
.play-ring::before{
  content:'';position:absolute;inset:-8px;border-radius:50%;
  border:1px solid rgba(63,217,200,.45);animation:pulse 2.6s var(--ease) infinite;
}
.play-ring::after{
  content:'';width:0;height:0;margin-left:4px;
  border-left:12px solid var(--primary);
  border-top:8px solid transparent;border-bottom:8px solid transparent;
}
@keyframes pulse{
  0%{transform:scale(.9);opacity:.7}
  70%{transform:scale(1.25);opacity:0}
  100%{transform:scale(1.25);opacity:0}
}
.media-caption{
  position:absolute;left:0;right:0;bottom:0;padding:22px 20px 18px;
  font-size:13px;line-height:1.6;color:var(--text-2);
  background:linear-gradient(to top,rgba(7,11,20,.94),rgba(7,11,20,0));
}

/* ---------- 板块 ---------- */
.section{padding:var(--sp) 0}
.section-alt{background:var(--bg-2);border-top:1px solid var(--divider);border-bottom:1px solid var(--divider)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:44px}
.section-head p{max-width:520px;font-size:15px;line-height:1.85;color:var(--text-2)}
.section-head-text{max-width:640px}

/* ---------- 编号清单 + 粘性摘要 ---------- */
.steps-layout{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:start}
.steps{border-top:1px solid var(--divider)}
.step{
  display:grid;grid-template-columns:64px 1fr 24px;gap:20px;align-items:center;
  padding:24px 0;border-bottom:1px solid var(--divider);
  transition:background var(--dur) var(--ease),padding var(--dur) var(--ease),border-radius var(--dur) var(--ease);
}
.step:hover{
  background:var(--glass);border-radius:var(--r-sm);padding-left:12px;padding-right:12px;
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
}
.step-num{
  font-family:var(--font-num);font-size:28px;font-weight:600;color:var(--gold);
  letter-spacing:.04em;line-height:1;transition:color var(--dur) var(--ease);
}
.step:hover .step-num{color:var(--primary)}
.step-title{font-size:17px;font-weight:600;line-height:1.6}
.step-desc{margin-top:6px;font-size:15px;line-height:1.8;color:var(--text-2)}
.step .arrow{width:18px;height:18px;color:var(--text-3);transition:transform var(--dur) var(--ease),color var(--dur) var(--ease)}
.step:hover .arrow{color:var(--primary);transform:translateX(4px)}
.aside-card{
  position:sticky;top:104px;padding:30px;border-radius:var(--r-lg);
  background:var(--glass);border:1px solid var(--line);
  box-shadow:var(--sh),var(--inset);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
}
.aside-card h3{margin-bottom:8px}
.aside-card .aside-note{font-size:14px;color:var(--text-3);line-height:1.7}
.aside-list{margin:20px 0 24px}
.aside-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:14px 0;border-bottom:1px dashed var(--divider);
  font-size:15px;line-height:1.8;color:var(--text-2);
}
.aside-list li:last-child{border-bottom:0}
.aside-list .dot{
  flex:0 0 auto;width:8px;height:8px;margin-top:11px;border-radius:3px;
  background:var(--primary);box-shadow:0 0 12px rgba(63,217,200,.7);
}

/* ---------- 场景卡 ---------- */
.scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.scene-card{
  display:grid;grid-template-columns:104px 1fr;gap:22px;align-items:center;
  padding:20px;border-radius:var(--r-lg);border:1px solid var(--line);background:var(--bg-2);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.scene-card:hover{border-color:var(--line-hover);transform:translateY(-2px);box-shadow:var(--sh)}
.scene-card img{width:104px;height:128px;object-fit:cover;border-radius:var(--r-sm);border:1px solid var(--divider)}
.scene-card h3{font-size:18px;margin-bottom:8px}
.scene-card p{font-size:14.5px;line-height:1.8;color:var(--text-2)}
.scene-tag{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;margin-bottom:10px;
  border-radius:var(--r-pill);border:1px solid rgba(242,184,114,.35);
  font-family:var(--font-num);font-size:12px;letter-spacing:.04em;color:var(--gold);
}

/* ---------- FAQ ---------- */
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;align-items:start}
.faq-item{
  border-radius:var(--r-lg);border:1px solid var(--line);
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--inset);overflow:hidden;
  transition:border-color var(--dur) var(--ease);
}
.faq-item:hover{border-color:var(--line-hover)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:18px;width:100%;
  padding:22px 24px;text-align:left;font-size:17px;font-weight:600;line-height:1.6;
}
.faq-icon{position:relative;flex:0 0 auto;width:18px;height:18px}
.faq-icon::before,.faq-icon::after{
  content:'';position:absolute;background:var(--primary);border-radius:2px;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.faq-icon::before{top:8px;left:0;width:18px;height:1.5px}
.faq-icon::after{top:0;left:8px;width:1.5px;height:18px}
.faq-item.is-open .faq-icon::after{transform:rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height 280ms var(--ease)}
.faq-item.is-open .faq-a{max-height:420px}
.faq-a-inner{
  margin:0 24px 24px;padding-left:16px;border-left:3px solid transparent;
  font-size:15px;line-height:1.85;color:var(--text-2);
  transition:border-color var(--dur) var(--ease);
}
.faq-item.is-open .faq-a-inner{border-left-color:var(--primary)}

/* ---------- 栏目胶囊 ---------- */
.chips-block{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:56px}
.chips-label{font-size:14px;color:var(--text-3);margin-right:6px}
.chip{
  display:inline-flex;align-items:center;gap:8px;height:42px;padding:0 20px;
  border-radius:var(--r-pill);border:1px solid var(--line);background:var(--bg-2);
  font-size:14px;color:var(--text-2);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.chip:hover{border-color:var(--line-hover);color:var(--primary);background:rgba(63,217,200,.08);transform:translateY(-2px)}
.chip .arrow{width:16px;height:16px}

/* ---------- CTA ---------- */
.cta-wrap{padding:0 0 var(--sp)}
.cta-panel{
  position:relative;overflow:hidden;
  display:grid;grid-template-columns:1fr auto;gap:36px;align-items:center;
  padding:44px;border-radius:var(--r-lg);border:1px solid var(--line);
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--sh),var(--inset);
}
.cta-panel::after{
  content:'';position:absolute;right:-60px;bottom:-90px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(63,217,200,.22),transparent 68%);
  filter:blur(60px);pointer-events:none;
}
.cta-panel h2{font-size:clamp(21px,2vw,28px)}
.cta-panel p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--text-2);max-width:480px}
.cta-actions{position:relative;z-index:1;display:flex;align-items:center;gap:20px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding-top:72px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;padding-bottom:56px}
.footer-brand p{max-width:360px;margin:18px 0 22px;font-size:15px;line-height:1.85;color:var(--text-2)}
.footer-social{display:flex;gap:12px}
.footer-social a{
  width:38px;height:38px;border-radius:12px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;color:var(--text-2);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-social a:hover{color:var(--primary);border-color:var(--line-hover);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}
.footer-col h3{font-size:15px;font-weight:600;margin-bottom:18px}
.footer-col li+li{margin-top:12px}
.footer-col a{
  display:inline-block;font-size:14.5px;color:var(--text-2);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-col a:hover{color:var(--primary);transform:translateX(2px)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between;align-items:center;
  border-top:1px solid var(--divider);padding:24px 0 32px;font-size:13px;color:var(--text-3);
}
.footer-bottom a{transition:color var(--dur) var(--ease)}
.footer-bottom a:hover{color:var(--primary)}

/* ---------- 移动端粘性条 ---------- */
.sticky-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:70;height:64px;display:none;
  align-items:center;justify-content:space-between;gap:12px;padding:0 18px;
  background:rgba(12,19,34,.88);border-top:1px solid var(--line);
  -webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);
  transform:translateY(110%);
  transition:transform 240ms var(--ease);
}
.sticky-bar.is-visible{transform:translateY(0)}
.sticky-icon{
  display:flex;align-items:center;justify-content:center;width:42px;height:42px;
  border-radius:12px;border:1px solid var(--line);color:var(--text-2);
}
.sticky-icon svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}

/* ---------- 入场动效 ---------- */
html.js .reveal{opacity:0;transform:translateY(18px);transition:opacity 320ms var(--ease),transform 320ms var(--ease)}
html.js .reveal.is-visible{opacity:1;transform:none}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  html.js .reveal{opacity:1;transform:none}
  .play-ring::before{display:none}
}

/* ---------- 断点 ---------- */
@media (max-width:1439px){
  .hero-grid{gap:48px}
}
@media (max-width:1199px){
  :root{--sp:88px}
  .hero-grid{grid-template-columns:5fr 6fr;gap:40px}
  .media-frame{height:480px}
  .steps-layout{grid-template-columns:6fr 5fr;gap:32px}
  .footer-grid{gap:36px}
}
@media (max-width:991px){
  :root{--sp:72px}
  .site-header{height:64px}
  .nav-actions .btn{display:none}
  .nav-toggle{display:inline-flex}
  .main-nav{
    position:fixed;top:64px;left:0;right:0;bottom:0;z-index:75;
    flex-direction:column;align-items:stretch;gap:4px;
    padding:28px 24px 40px;overflow-y:auto;
    background:rgba(7,11,20,.98);
    -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
    transform:translateY(-10px);opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity 200ms var(--ease),transform 200ms var(--ease),visibility 200ms var(--ease);
  }
  .main-nav.is-open{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .nav-link{width:100%;font-size:20px;padding:14px 16px;border-radius:14px}
  .nav-link::after{display:none}
  .nav-link.is-active{background:rgba(63,217,200,.12)}
  .hero{padding:48px 0 24px}
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-media{justify-content:center}
  .media-frame{height:auto;width:100%;max-width:420px;aspect-ratio:4/5}
  .hero-stats{gap:32px}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:36px}
  .steps-layout{grid-template-columns:1fr;gap:36px}
  .aside-card{position:static}
  .faq-grid{grid-template-columns:1fr}
  .cta-panel{grid-template-columns:1fr;gap:26px;padding:34px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:767px){
  :root{--sp:56px}
  body{font-size:16px;padding-bottom:84px}
  .container{padding:0 20px}
  .breadcrumb{padding-top:22px}
  .hero-stats{gap:24px;justify-content:space-between}
  .stat{min-width:88px}
  .scene-grid{grid-template-columns:1fr}
  .scene-card{grid-template-columns:88px 1fr;gap:18px}
  .scene-card img{width:88px;height:112px}
  .step{grid-template-columns:44px 1fr 20px;gap:14px;padding:20px 0}
  .step-num{font-size:20px}
  .cta-actions{width:100%;flex-direction:column;align-items:stretch;gap:14px}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:32px;padding-bottom:40px}
  .footer-col{border-top:1px solid var(--divider);padding-top:24px}
  .sticky-bar{display:flex}
  .chips-block{margin-top:44px}
}
@media (max-width:479px){
  .hero-actions{flex-direction:column;align-items:stretch;gap:12px}
  .hero-actions .btn{width:100%}
  .hero-stats{gap:20px}
  .aside-card,.cta-panel{padding:24px}
  .chip{height:40px;padding:0 16px;font-size:13.5px}
  .faq-q{font-size:16px;padding:18px 18px}
  .faq-a-inner{margin:0 18px 20px}
}

/* roulang page: category4 */
:root{
  --bg:#070B14;
  --bg-alt:#0C1322;
  --bg-inset:#101A2C;
  --brand:#3FD9C8;
  --brand-hover:#5FE7D8;
  --brand-active:#2AB8AA;
  --brand-deep:#0F6E66;
  --gold:#F2B872;
  --link:#4C8CFF;
  --ok:#46D39A;
  --err:#F2607A;
  --text:#EAF1F8;
  --text-2:#A7B6C8;
  --text-3:#6B7C93;
  --on-brand:#04120F;
  --line:rgba(255,255,255,.08);
  --line-soft:rgba(255,255,255,.05);
  --line-hover:rgba(63,217,200,.35);
  --glass:rgba(18,28,46,.55);
  --r-lg:20px;
  --r-sm:14px;
  --r-media:24px;
  --r-input:12px;
  --r-pill:999px;
  --sh:0 20px 40px -20px rgba(0,0,0,.6);
  --sh-glow:0 12px 40px -12px rgba(63,217,200,.45);
  --inset-hi:inset 0 1px 0 rgba(255,255,255,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
  --pad-section:112px;
  --font-cn:"Noto Sans SC","HarmonyOS Sans","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-num:"Inter","DIN Alternate","Segoe UI",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.9;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
::selection{background:rgba(63,217,200,.3);color:var(--text)}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}
.section{padding:var(--pad-section) 0}
.section-alt{background:var(--bg-alt);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px}
.section-head-center{flex-direction:column;align-items:center;text-align:center;gap:14px}
h1{font-size:clamp(30px,4.2vw,54px);font-weight:800;line-height:1.25;letter-spacing:.01em}
h2{font-size:clamp(23px,2.4vw,34px);font-weight:700;line-height:1.35;letter-spacing:.01em}
h3{font-size:21px;font-weight:600;line-height:1.5}
p{color:var(--text-2);font-size:16.5px;line-height:1.9}
.lead{font-size:17.5px;line-height:1.95}
.muted{color:var(--text-3);font-size:13.5px;line-height:1.6}
.num{font-family:var(--font-num);letter-spacing:.04em}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--brand);background:rgba(63,217,200,.1);border:1px solid rgba(63,217,200,.28);border-radius:var(--r-pill);padding:6px 14px}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 10px rgba(63,217,200,.9)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-pill);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;padding:14px 26px;
  cursor:pointer;transition:transform .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease),color .2s var(--ease);
  white-space:nowrap;
}
.btn-primary{background:var(--brand);color:var(--on-brand);box-shadow:var(--sh-glow)}
.btn-primary:hover{background:var(--brand-hover);transform:translateY(-2px)}
.btn-primary:active{background:var(--brand-active);transform:translateY(0)}
.btn-ghost{background:transparent;border-color:rgba(63,217,200,.45);color:var(--brand)}
.btn-ghost:hover{background:rgba(63,217,200,.1);border-color:var(--brand);transform:translateY(-2px)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-lg{padding:16px 32px;font-size:16px}
.text-link{color:var(--brand);font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:gap .2s var(--ease),color .2s var(--ease)}
.text-link::after{content:"→";font-family:var(--font-num)}
.text-link:hover{gap:10px;color:var(--brand-hover)}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(7,11,20,.72);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header.is-scrolled{background:rgba(7,11,20,.92);border-bottom-color:var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{position:relative;width:26px;height:26px;border-radius:9px;background:linear-gradient(140deg,var(--brand),var(--brand-deep));box-shadow:0 0 18px rgba(63,217,200,.5)}
.brand-mark::after{content:"";position:absolute;inset:8px;border-radius:3px;background:rgba(4,18,15,.6)}
.brand-text{font-size:17px;font-weight:700;color:var(--text);letter-spacing:.01em;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;font-size:15px;color:var(--text-2);padding:6px 0;transition:color .2s var(--ease)}
.nav-link::after{content:"";position:absolute;left:50%;bottom:-4px;width:4px;height:4px;border-radius:50%;background:var(--brand);transform:translateX(-50%) scale(0);transition:transform .2s var(--ease)}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{transform:translateX(-50%) scale(1)}
.nav-link.is-active{color:var(--brand)}
.nav-link.is-active::before{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),rgba(63,217,200,0))}
.nav-link.is-active::after{transform:translateX(-50%) scale(0)}
.nav-actions{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.nav-toggle{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:rgba(16,26,44,.7);position:relative;cursor:pointer}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{position:absolute;left:50%;width:18px;height:2px;border-radius:2px;background:var(--text);transform:translateX(-50%);transition:transform .22s var(--ease),opacity .22s var(--ease)}
.nav-toggle span{top:50%;margin-top:-1px}
.nav-toggle span::before{content:"";top:-6px;left:0;transform:none}
.nav-toggle span::after{content:"";top:6px;left:0;transform:none}
.nav-drawer-cta{display:none}

/* ---------- 面包屑 ---------- */
.breadcrumb-wrap{padding-top:28px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--text-3)}
.breadcrumb a{color:var(--text-3);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:rgba(107,124,147,.6)}
.breadcrumb .current{color:var(--brand)}

/* ---------- Hero ---------- */
.cat-hero{position:relative;padding:48px 0 96px;overflow:hidden}
.spot{position:absolute;border-radius:50%;filter:blur(120px);pointer-events:none;z-index:0}
.spot-a{width:42vw;height:42vw;left:-12vw;top:-16vw;background:radial-gradient(circle,rgba(63,217,200,.28),rgba(63,217,200,0) 70%)}
.spot-b{width:30vw;height:30vw;right:-8vw;bottom:-12vw;background:radial-gradient(circle,rgba(242,184,114,.12),rgba(242,184,114,0) 70%)}
.cat-hero::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.035;
  background-image:linear-gradient(rgba(255,255,255,.9) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.9) 1px,transparent 1px);
  background-size:56px 56px;
}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center}
.hero-copy{display:flex;flex-direction:column;gap:22px}
.hero-copy h1{margin-top:4px}
.hero-sub{font-size:17.5px;line-height:1.9;color:var(--text-2);max-width:520px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:6px}
.stat-row{display:flex;flex-wrap:wrap;gap:40px;margin-top:28px;padding-top:26px;border-top:1px solid var(--line-soft)}
.stat-item{display:flex;flex-direction:column;gap:4px}
.stat-num{font-family:var(--font-num);font-size:24px;font-weight:700;color:var(--brand);letter-spacing:.04em}
.stat-label{font-size:13px;color:var(--text-3)}
.media-col{display:flex;justify-content:flex-end}
.media-frame{
  position:relative;width:100%;max-width:380px;height:560px;
  border-radius:var(--r-media);overflow:hidden;border:1px solid var(--line);
  background:var(--bg-inset);box-shadow:var(--sh);
}
.media-frame img{width:100%;height:100%;object-fit:cover;opacity:.86}
.media-frame::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(7,11,20,.1) 0%,rgba(7,11,20,.05) 45%,rgba(7,11,20,.9) 100%)}
.media-caption{position:absolute;left:20px;right:20px;bottom:18px;z-index:2;font-size:13px;color:var(--text-2);line-height:1.6}
.media-corner{position:absolute;width:26px;height:26px;border:1px solid rgba(63,217,200,.55);z-index:2}
.media-corner.tl{top:16px;left:16px;border-right:0;border-bottom:0;border-radius:8px 0 0 0}
.media-corner.tr{top:16px;right:16px;border-left:0;border-bottom:0;border-radius:0 8px 0 0}
.media-corner.bl{bottom:16px;left:16px;border-right:0;border-top:0;border-radius:0 0 0 8px}
.media-corner.br{bottom:16px;right:16px;border-left:0;border-top:0;border-radius:0 0 8px 0}
.pulse-ring{position:absolute;left:50%;top:46%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:rgba(63,217,200,.14);border:1px solid rgba(63,217,200,.6);z-index:2;animation:pulse 2.6s var(--ease) infinite}
.pulse-ring::before{content:"";border-left:14px solid var(--brand);border-top:9px solid transparent;border-bottom:9px solid transparent;margin-left:4px}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(63,217,200,.35)}50%{box-shadow:0 0 0 16px rgba(63,217,200,0)}}

/* ---------- 通用玻璃卡 ---------- */
.card{
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh),var(--inset-hi);
  padding:30px;
  transition:border-color .22s var(--ease),transform .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{border-color:var(--line-hover);transform:translateY(-2px)}

/* ---------- 双列大卡 ---------- */
.feature-split{
  display:grid;grid-template-columns:1fr 1fr;
  border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;
  background:var(--glass);box-shadow:var(--sh),var(--inset-hi);
  backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);
}
.split-media{position:relative;min-height:420px;overflow:hidden}
.split-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.75}
.split-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(7,11,20,.25),rgba(7,11,20,.92))}
.split-media-inner{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;justify-content:flex-end;gap:14px;padding:34px}
.split-media-inner h3{color:var(--text)}
.split-media-inner p{font-size:15.5px;color:var(--text-2);line-height:1.8}
.split-list{padding:34px 34px 26px;display:flex;flex-direction:column;gap:6px}
.split-list-title{font-size:14px;font-weight:600;color:var(--text-3);letter-spacing:.04em;margin-bottom:12px}
.info-list li{display:flex;gap:14px;align-items:flex-start;padding:15px 0;border-bottom:1px solid var(--line-soft);transition:transform .2s var(--ease)}
.info-list li:last-child{border-bottom:0}
.info-list li:hover{transform:translateX(4px)}
.info-list .idx{font-family:var(--font-num);font-size:13px;font-weight:700;color:var(--gold);flex:0 0 26px;padding-top:4px;letter-spacing:.04em}
.info-list .txt strong{display:block;font-size:16.5px;font-weight:600;color:var(--text);line-height:1.6}
.info-list .txt span{display:block;font-size:14.5px;color:var(--text-2);line-height:1.75;margin-top:2px}
.info-list .arrow{margin-left:auto;color:var(--text-3);font-family:var(--font-num);padding-top:4px;transition:color .2s var(--ease)}
.info-list li:hover .arrow{color:var(--brand)}

/* ---------- 三列卡 ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{display:flex;flex-direction:column;gap:12px}
.step-num{font-family:var(--font-num);font-size:28px;font-weight:700;color:var(--gold);letter-spacing:.04em;line-height:1}
.step-card h3{font-size:18.5px}
.step-card p{font-size:15px;line-height:1.8}

/* ---------- FAQ ---------- */
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.faq-item{
  background:var(--glass);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--inset-hi);transition:border-color .22s var(--ease)
}
.faq-item.is-open{border-color:var(--line-hover)}
.faq-q{
  position:relative;width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  background:none;border:0;text-align:left;cursor:pointer;color:var(--text);
  font-size:17px;font-weight:600;line-height:1.6;padding:20px 22px
}
.faq-q::before{content:"";position:absolute;left:0;top:16px;bottom:16px;width:3px;border-radius:3px;background:var(--brand);transform:scaleY(0);transform-origin:top;transition:transform .22s var(--ease)}
.faq-item.is-open .faq-q::before{transform:scaleY(1)}
.faq-sign{position:relative;flex:0 0 16px;width:16px;height:16px}
.faq-sign::before,.faq-sign::after{content:"";position:absolute;background:var(--brand);border-radius:2px;transition:transform .22s var(--ease)}
.faq-sign::before{left:0;right:0;top:7px;height:2px}
.faq-sign::after{top:0;bottom:0;left:7px;width:2px}
.faq-item.is-open .faq-sign::after{transform:scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s var(--ease)}
.faq-a p{padding:0 22px 22px;margin:0;font-size:15px;line-height:1.8;color:var(--text-2)}

/* ---------- 交叉链接胶囊 ---------- */
.chip-row{display:flex;flex-wrap:wrap;gap:14px}
.chip-link{
  display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:var(--text-2);
  border:1px solid var(--line);border-radius:var(--r-pill);padding:13px 24px;background:rgba(16,26,44,.6);
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease)
}
.chip-link:hover{color:var(--brand);border-color:var(--line-hover);transform:translateY(-2px)}
.chip-link .dot{width:6px;height:6px;border-radius:50%;background:var(--brand);opacity:.8}

/* ---------- CTA ---------- */
.cta-panel{
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  padding:40px;border-radius:var(--r-lg);border:1px solid var(--line-hover);
  background:linear-gradient(120deg,rgba(18,28,46,.78),rgba(15,110,102,.28));
  box-shadow:var(--sh),var(--inset-hi);
  backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);
}
.cta-copy{display:flex;flex-direction:column;gap:10px;max-width:620px}
.cta-copy p{font-size:16px;color:var(--text-2)}
.cta-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-alt);padding:72px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;flex-direction:column;gap:16px}
.footer-brand p{font-size:14.5px;color:var(--text-2);line-height:1.85;max-width:330px}
.footer-social{display:flex;gap:12px}
.footer-social a{
  width:38px;height:38px;border-radius:12px;border:1px solid var(--line);
  display:inline-flex;align-items:center;justify-content:center;color:var(--text-3);
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease)
}
.footer-social a:hover{color:var(--brand);border-color:var(--line-hover);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}
.footer-col h3{font-size:15px;font-weight:600;color:var(--text);margin-bottom:18px;letter-spacing:.04em}
.footer-col ul{display:flex;flex-direction:column;gap:12px}
.footer-col a{font-size:14.5px;color:var(--text-2);display:inline-block;transition:color .2s var(--ease),transform .2s var(--ease)}
.footer-col a:hover{color:var(--brand);transform:translateX(2px)}
.footer-bottom{
  margin-top:56px;border-top:1px solid var(--line-soft);padding:24px 0 32px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px
}
.copyright{font-size:13.5px;color:var(--text-3)}
.footer-meta{display:flex;flex-wrap:wrap;gap:20px}
.footer-meta a{font-size:13.5px;color:var(--text-3);transition:color .2s var(--ease)}
.footer-meta a:hover{color:var(--brand)}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  :root{--pad-section:88px}
  .hero-grid{gap:40px}
  .media-frame{height:500px;max-width:330px}
}
@media (max-width:991px){
  :root{--pad-section:72px}
  .main-nav{
    position:fixed;inset:64px 0 0 0;z-index:90;flex-direction:column;align-items:flex-start;gap:0;
    padding:28px 24px 32px;background:rgba(7,11,20,.98);backdrop-filter:blur(18px);
    border-top:1px solid var(--line);overflow-y:auto;
    transform:translateY(-8px);opacity:0;visibility:hidden;
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease)
  }
  .main-nav .nav-link{width:100%;font-size:20px;font-weight:600;padding:16px 0;border-bottom:1px solid var(--line-soft);opacity:0;transform:translateY(8px);transition:opacity .24s var(--ease),transform .24s var(--ease),color .2s var(--ease)}
  .main-nav .nav-link::after{display:none}
  .main-nav .nav-link.is-active::before{display:none}
  .main-nav .nav-link.is-active{color:var(--brand)}
  .nav-drawer-cta{
    display:inline-flex;width:100%;margin-top:28px
  }
  body.nav-open .main-nav{transform:translateY(0);opacity:1;visibility:visible}
  body.nav-open .main-nav .nav-link{opacity:1;transform:translateY(0)}
  body.nav-open .main-nav .nav-link:nth-child(1){transition-delay:.04s}
  body.nav-open .main-nav .nav-link:nth-child(2){transition-delay:.08s}
  body.nav-open .main-nav .nav-link:nth-child(3){transition-delay:.12s}
  body.nav-open .main-nav .nav-link:nth-child(4){transition-delay:.16s}
  body.nav-open .main-nav .nav-link:nth-child(5){transition-delay:.2s}
  body.nav-open{overflow:hidden}
  .nav-toggle{display:inline-block}
  .nav-actions .btn{display:none}
  .nav-wrap{height:64px}
  .cat-hero{padding:32px 0 72px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .media-col{justify-content:center}
  .media-frame{height:440px;max-width:300px}
  .feature-split{grid-template-columns:1fr}
  .split-media{min-height:300px}
  .grid-3{grid-template-columns:1fr 1fr}
  .faq-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-panel{flex-direction:column;align-items:flex-start}
}
@media (max-width:767px){
  :root{--pad-section:56px}
  .container{padding:0 20px}
  h1{font-size:30px}
  h2{font-size:23px}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:32px}
  .grid-3{grid-template-columns:1fr}
  .stat-row{gap:28px}
  .footer-grid{grid-template-columns:1fr}
  .footer-col{border-top:1px solid var(--line-soft);padding-top:22px}
  .footer-brand{border-top:0;padding-top:0}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .cta-panel{padding:28px}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .card{padding:24px}
  .split-list{padding:26px 22px 20px}
  .info-list li:hover{transform:none}
}
@media (max-width:479px){
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .media-frame{height:380px;max-width:260px}
  .chip-link{width:100%;justify-content:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .pulse-ring{animation:none}
}