/* roulang page: index */
:root{
  --ink-900:#05070C;
  --ink-800:#0A0F1A;
  --glass-fill:rgba(255,255,255,.045);
  --glass-stroke:rgba(255,255,255,.10);
  --hairline:rgba(255,255,255,.08);
  --primary:#14E3C8;
  --primary-dim:#0E9E8C;
  --accent:#FF5A1F;
  --text-1:#EAF0F6;
  --text-2:#9AA8B8;
  --text-3:#5F6B7A;
  --paper:#F4F6F8;
  --paper-text:#0B1118;
  --radius-glass:20px;
  --radius-card:16px;
  --radius-img:12px;
  --shadow-soft:0 20px 60px -20px rgba(0,0,0,.6);
  --ease:cubic-bezier(.22,.61,.36,1);
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:92px}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none;transition:color .22s var(--ease),border-color .22s var(--ease),background-color .22s var(--ease)}
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}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
::selection{background:rgba(20,227,200,.28);color:#fff}

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

.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

/* ---------- 顶栏 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  border-bottom:1px solid transparent;
  transition:background-color .32s var(--ease),border-color .32s var(--ease),backdrop-filter .32s var(--ease);
}
.site-header.scrolled{
  background:rgba(5,7,12,.74);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-bottom-color:var(--hairline);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:inline-flex;align-items:center;gap:9px;color:var(--text-1);flex:none}
.brand-mark{color:var(--primary);display:inline-flex;line-height:0}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.01em;white-space:nowrap}
.brand-sub{font-size:12px;font-weight:500;color:var(--text-2);margin-left:5px;letter-spacing:.02em}
@media (max-width:420px){
  .brand-text{font-size:15.5px}
  .brand-sub{font-size:11px;margin-left:3px}
}
.nav-link{
  position:relative;font-size:14.5px;color:var(--text-2);padding:6px 0;white-space:nowrap;
  transition:color .22s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--primary);
  transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--text-1)}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1)}
.nav-link.active{color:var(--text-1)}
.burger{
  width:42px;height:42px;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  border:1px solid var(--glass-stroke);border-radius:12px;background:var(--glass-fill);
  transition:border-color .22s var(--ease),background-color .22s var(--ease);
}
.burger:hover{border-color:rgba(20,227,200,.5)}
.burger span{display:block;width:18px;height:1.5px;background:var(--text-1);transition:transform .3s var(--ease),opacity .3s var(--ease)}
.burger[aria-expanded="true"] span:first-child{transform:translateY(3.75px) rotate(45deg)}
.burger[aria-expanded="true"] span:last-child{transform:translateY(-3.75px) rotate(-45deg)}

.mobile-panel{
  position:fixed;inset:0;z-index:65;display:flex;flex-direction:column;justify-content:center;
  padding:96px 28px 48px;background:rgba(5,7,12,.95);
  -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  opacity:0;pointer-events:none;transition:opacity .3s var(--ease);
}
.mobile-panel.open{opacity:1;pointer-events:auto}
.mobile-link{
  display:block;font-size:20px;font-weight:600;color:var(--text-1);
  padding:20px 4px;border-bottom:1px solid var(--hairline);
}
.mobile-link:first-of-type{border-top:1px solid var(--hairline)}
.mobile-link:hover,.mobile-link.active{color:var(--primary)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:999px;
  font-size:15px;font-weight:600;line-height:1;white-space:nowrap;
  transition:background-color .22s var(--ease),color .22s var(--ease),box-shadow .22s var(--ease),
             transform .22s var(--ease),border-color .22s var(--ease);
}
.btn-primary{
  background:var(--primary);color:#04120F;
  box-shadow:0 0 0 1px rgba(20,227,200,.35),0 8px 30px -8px rgba(20,227,200,.55);
}
.btn-primary:hover{
  background:#3BF0D8;transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(20,227,200,.5),0 12px 40px -8px rgba(20,227,200,.7);
}
.btn-primary:active{transform:translateY(1px);box-shadow:0 0 0 1px rgba(20,227,200,.4),0 4px 16px -6px rgba(20,227,200,.5)}
.btn-ghost{
  border:1px solid rgba(20,227,200,.4);background:var(--glass-fill);color:var(--text-1);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.btn-ghost:hover{background:rgba(20,227,200,.1);border-color:rgba(20,227,200,.72);color:#CFFFF7}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.btn-paper{background:var(--paper-text);color:#F4F6F8;box-shadow:0 12px 30px -14px rgba(11,17,24,.6)}
.btn-paper:hover{background:#1B2531;transform:translateY(-1px)}
.link-underline{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  color:var(--primary);font-size:14.5px;font-weight:600;
}
.link-underline::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:100%;background:currentColor;
  transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease);
}
.link-underline:hover::after{transform:scaleX(1)}
.link-plain{color:var(--text-2);font-size:14.5px}
.link-plain:hover{color:var(--primary)}

/* ---------- 徽章 / 玻璃卡 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;border-radius:999px;
  font-size:12.5px;line-height:1;letter-spacing:.02em;
  border:1px solid var(--glass-stroke);background:var(--glass-fill);color:var(--text-2);
}
.badge-primary{background:rgba(20,227,200,.12);border-color:rgba(20,227,200,.28);color:#7FF3E4}
.badge-accent{background:rgba(255,90,31,.12);border-color:rgba(255,90,31,.35);color:#FFB08A}
.badge-dark{background:rgba(11,17,24,.05);border-color:rgba(11,17,24,.14);color:rgba(11,17,24,.65)}
.glass{
  background:var(--glass-fill);
  border:1px solid var(--glass-stroke);
  border-radius:var(--radius-glass);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06),var(--shadow-soft);
}
.thumb-16-10{aspect-ratio:16/10;border-radius:14px;overflow:hidden;background:var(--ink-800)}
.thumb-16-10 img{width:100%;height:100%;object-fit:cover;display:block}
.clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- 首屏 ---------- */
.hero{position:relative;overflow:hidden;padding:150px 0 96px}
.hero-bg{
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;background-position:center;
  opacity:.16;
}
.hero-mask{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,7,12,.88) 0%,rgba(5,7,12,.92) 52%,rgba(5,7,12,1) 100%);
}
.hero-title{
  font-size:clamp(30px,4.6vw,52px);line-height:1.25;font-weight:700;letter-spacing:-.01em;
  margin-top:20px;max-width:660px;
}
.hero-sub{font-size:clamp(16px,1.6vw,18px);color:var(--text-2);line-height:1.85;margin-top:18px;max-width:560px}
.hero-points{display:flex;flex-wrap:wrap;margin-top:36px}
.hero-points li{
  position:relative;font-size:14px;color:var(--text-2);padding:0 22px;line-height:1.6;
  border-left:1px solid var(--hairline);
}
.hero-points li:first-child{padding-left:0;border-left:0}
.hero-visual{padding:18px}
.hero-visual .meta-row{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:16px;font-size:13px;color:var(--text-3);
}
.scroll-hint{
  display:inline-flex;align-items:center;gap:10px;margin-top:64px;
  font-size:13px;color:var(--text-3);letter-spacing:.04em;
}
.scroll-hint i{display:block;width:1px;height:30px;background:linear-gradient(180deg,var(--primary),transparent)}
@media (max-width:767px){
  .hero{padding:118px 0 68px}
  .hero-points li{padding:0 16px}
  .scroll-hint{margin-top:44px}
}

/* ---------- 分区 ---------- */
.section{padding:88px 0}
@media (min-width:1024px){.section{padding:120px 0}}
@media (max-width:767px){.section{padding:60px 0}}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.section-head h2{font-size:clamp(24px,3vw,34px);line-height:1.35;font-weight:700;letter-spacing:-.01em;margin-top:14px}
.section-num{font-size:13px;color:var(--text-3);letter-spacing:.16em}
.hairline{border:0;border-top:1px solid var(--hairline);margin:0}

/* ---------- 卖点 ---------- */
.feature-main{padding:24px}
.feature-main h3{font-size:19px;font-weight:600;line-height:1.5;margin-top:20px}
.feature-main p{color:var(--text-2);font-size:15px;line-height:1.85;margin-top:12px;max-width:640px}
.feature-list{margin-top:20px;display:grid;gap:10px}
@media (min-width:768px){.feature-list{grid-template-columns:1fr 1fr}}
.feature-list li{position:relative;padding-left:22px;font-size:14.5px;color:var(--text-2)}
.feature-list li::before{
  content:"";position:absolute;left:0;top:10px;width:10px;height:6px;
  border-left:1.5px solid var(--primary);border-bottom:1.5px solid var(--primary);
  transform:rotate(-45deg);
}
.feature-card{padding:26px;border-radius:var(--radius-glass)}
.feature-card .num{font-family:var(--mono);font-size:13px;color:var(--primary);letter-spacing:.12em}
.feature-card h3{font-size:17px;font-weight:600;line-height:1.5;margin-top:14px}
.feature-card p{font-size:14.5px;color:var(--text-2);line-height:1.8;margin-top:10px}

/* ---------- 演示 ---------- */
.demo-section{background:linear-gradient(180deg,rgba(10,15,26,0) 0%,rgba(10,15,26,.85) 40%,rgba(10,15,26,0) 100%)}
.device-frame{
  position:relative;padding:10px;border-radius:22px;border:1px solid var(--glass-stroke);
  background:var(--ink-800);box-shadow:var(--shadow-soft);
}
.device-frame::before{
  content:"";position:absolute;inset:-50px -30px;z-index:-1;
  background:radial-gradient(circle at 50% 42%,rgba(20,227,200,.14),transparent 66%);
}
.device-frame img{border-radius:14px;width:100%;aspect-ratio:16/10;object-fit:cover}
.steps li{position:relative;padding-left:64px;padding-bottom:30px}
.steps li::before{
  content:attr(data-step);
  position:absolute;left:0;top:2px;width:38px;height:38px;border-radius:999px;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:13px;color:var(--primary);
  border:1px solid rgba(20,227,200,.35);background:rgba(20,227,200,.06);
}
.steps li::after{
  content:"";position:absolute;left:19px;top:46px;bottom:8px;width:1px;background:var(--hairline);
}
.steps li:last-child{padding-bottom:0}
.steps li:last-child::after{display:none}
.steps h3{font-size:17px;font-weight:600;line-height:1.5}
.steps p{font-size:14.5px;color:var(--text-2);line-height:1.8;margin-top:8px;max-width:460px}

/* ---------- 浅色反相区 ---------- */
.band-paper{background:var(--paper);color:var(--paper-text)}
.paper-h2{font-size:clamp(24px,3vw,34px);line-height:1.35;font-weight:700;letter-spacing:-.01em;margin-top:14px}
.paper-p{color:rgba(11,17,24,.66);font-size:15px;line-height:1.85;margin-top:16px;max-width:340px}
.metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:36px 0}
@media (min-width:1024px){.metrics{grid-template-columns:repeat(4,1fr)}}
.metric{padding:0 22px;border-left:1px solid rgba(11,17,24,.12)}
.metric:first-child{padding-left:0;border-left:0}
.metric-value{
  font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:clamp(32px,3.6vw,50px);line-height:1.1;font-weight:700;color:var(--paper-text);
}
.metric-label{font-size:14px;color:rgba(11,17,24,.6);margin-top:10px;line-height:1.7}
.tag-cloud{
  display:flex;flex-wrap:wrap;gap:10px;margin-top:48px;padding-top:32px;
  border-top:1px solid rgba(11,17,24,.12);
}
.tag-cloud span{
  font-size:13.5px;color:rgba(11,17,24,.48);padding:6px 14px;
  border:1px solid rgba(11,17,24,.12);border-radius:999px;
}
@media (max-width:639px){
  .metric:nth-child(3){padding-left:0;border-left:0}
}

/* ---------- 资讯列表 ---------- */
.news-card{
  display:block;border-radius:var(--radius-card);overflow:hidden;
  background:var(--glass-fill);border:1px solid var(--glass-stroke);
  transition:transform .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.news-card:hover{
  transform:translateY(-2px);border-color:rgba(20,227,200,.35);
  box-shadow:0 24px 50px -26px rgba(0,0,0,.85);
}
.news-thumb{aspect-ratio:16/10;overflow:hidden;background:var(--ink-800);border-radius:12px;margin:10px}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.news-card:hover .news-thumb img{transform:scale(1.03)}
.news-body{padding:6px 20px 22px}
.news-body h3{font-size:17px;font-weight:600;line-height:1.55;margin-top:12px}
.news-body p{font-size:14px;color:var(--text-2);line-height:1.8;margin-top:10px}
.news-body time{display:block;margin-top:16px;font-size:13px;color:var(--text-3);letter-spacing:.03em}
.empty-state{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  padding:72px 24px;border-radius:var(--radius-glass);text-align:center;
  background:var(--glass-fill);border:1px solid var(--glass-stroke);
}
.empty-state svg{color:var(--text-3)}
.empty-state p{font-size:15px;color:var(--text-2)}

/* ---------- 方案 ---------- */
.plan-card{position:relative;padding:28px;border-radius:var(--radius-glass)}
.plan-card h3{font-size:18px;font-weight:600;line-height:1.5;margin-top:16px}
.plan-card .plan-desc{font-size:14.5px;color:var(--text-2);line-height:1.8;margin-top:10px}
.plan-value{
  font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:clamp(30px,3.2vw,42px);font-weight:700;line-height:1.1;margin-top:22px;color:var(--text-1);
}
.plan-value small{font-size:14px;font-family:inherit;font-weight:500;color:var(--text-3);margin-left:8px}
.plan-featured{
  border:1px solid rgba(20,227,200,.55);background:rgba(20,227,200,.06);
  box-shadow:0 0 0 1px rgba(20,227,200,.16),0 26px 60px -26px rgba(20,227,200,.35);
}
.plan-flag{
  position:absolute;top:-12px;left:28px;height:24px;padding:0 12px;border-radius:999px;
  display:inline-flex;align-items:center;background:var(--accent);color:#1A0800;
  font-size:12px;font-weight:700;letter-spacing:.04em;
}
.plan-list{margin-top:22px;padding-top:20px;border-top:1px solid var(--hairline)}
.plan-list li{position:relative;padding-left:24px;font-size:14.5px;color:var(--text-2);line-height:1.8;margin-bottom:10px}
.plan-list li:last-child{margin-bottom:0}
.plan-list li::before{
  content:"";position:absolute;left:0;top:11px;width:10px;height:6px;
  border-left:1.5px solid var(--primary);border-bottom:1.5px solid var(--primary);
  transform:rotate(-45deg);
}
.plan-action{display:block;margin-top:24px}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:760px}
.faq-item{border-bottom:1px solid var(--hairline)}
.faq-item:first-child{border-top:1px solid var(--hairline)}
.faq-q{
  width:100%;display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
  padding:24px 0;text-align:left;font-size:17px;font-weight:600;line-height:1.6;color:var(--text-1);
  transition:color .22s var(--ease);
}
.faq-q:hover{color:var(--primary)}
.faq-icon{position:relative;flex:none;width:16px;height:16px;margin-top:6px}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--primary);
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.faq-icon::before{left:0;right:0;top:7.25px;height:1.5px}
.faq-icon::after{top:0;bottom:0;left:7.25px;width:1.5px}
.faq-q[aria-expanded="true"] .faq-icon::after{transform:scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s var(--ease)}
.faq-a-inner{padding:0 40px 26px 0;font-size:15px;color:var(--text-2);line-height:1.9}

/* ---------- 尾部 CTA ---------- */
.cta-band{
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  padding:36px 32px;border-radius:var(--radius-glass);
}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);font-weight:700;line-height:1.4;letter-spacing:-.01em}
.cta-band p{font-size:15px;color:var(--text-2);margin-top:12px;line-height:1.8}
.cta-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--hairline);padding:72px 0 32px;background:var(--ink-900)}
.footer-grid{display:grid;grid-template-columns:1fr;gap:40px}
@media (min-width:768px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.7fr 1fr 1fr 1.3fr;gap:48px}}
.footer-grid h3{font-size:14px;font-weight:600;color:var(--text-1);letter-spacing:.04em;margin-bottom:18px}
.footer-grid p{font-size:14px;color:var(--text-3);line-height:1.85;margin-top:16px;max-width:320px}
.footer-list li{margin-bottom:12px}
.footer-list a,.footer-list span{font-size:14px;color:var(--text-3);position:relative;display:inline-block}
.footer-list a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:100%;background:var(--primary);
  transform:scaleX(0);transform-origin:left;transition:transform .26s var(--ease);
}
.footer-list a:hover{color:var(--primary)}
.footer-list a:hover::after{transform:scaleX(1)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:56px;padding-top:24px;border-top:1px solid var(--hairline);
  font-size:13px;color:var(--text-3);
}
@media (max-width:767px){.site-footer{padding-bottom:88px}}

/* ---------- 浮动 CTA ---------- */
.float-cta{
  position:fixed;right:28px;bottom:28px;z-index:70;display:flex;align-items:center;gap:10px;
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .35s var(--ease),transform .35s var(--ease);
}
.float-cta.show{opacity:1;pointer-events:auto;transform:none}
@media (max-width:767px){
  .float-cta{
    left:0;right:0;bottom:0;gap:10px;
    padding:10px 16px calc(10px + env(safe-area-inset-bottom));
    background:rgba(10,15,26,.84);
    -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
    border-top:1px solid var(--hairline);
    transform:translateY(100%);
  }
  .float-cta.show{transform:none}
  .float-cta .btn-primary{flex:1 1 68%}
  .float-cta .btn-ghost{flex:0 0 auto}
}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: article */
:root{
  --ink-900:#05070C;
  --ink-800:#0A0F1A;
  --glass-fill:rgba(255,255,255,.045);
  --glass-stroke:rgba(255,255,255,.10);
  --hairline:rgba(255,255,255,.08);
  --primary:#14E3C8;
  --primary-dim:#0E9E8C;
  --accent:#FF5A1F;
  --text-1:#EAF0F6;
  --text-2:#9AA8B8;
  --text-3:#5F6B7A;
  --paper:#F4F6F8;
  --paper-text:#0B1118;
  --radius-card:20px;
  --radius-sm:16px;
  --shadow-deep:0 20px 60px -20px rgba(0,0,0,.6);
  --font-cn:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--text-1);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
::selection{background:rgba(20,227,200,.28);color:#fff}
h1,h2,h3,h4,p,ul,ol{margin:0}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  transition:background .3s ease,border-color .3s ease,backdrop-filter .3s ease;
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(5,7,12,.76);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  border-bottom-color:var(--hairline);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;height:72px;
}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text-1);flex-shrink:0}
.brand-mark{display:inline-flex;color:var(--primary);line-height:0}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.02em;white-space:nowrap}
.brand-sub{font-size:12px;font-weight:500;color:var(--text-2);margin-left:5px;letter-spacing:0}
.nav-link{
  position:relative;font-size:14.5px;color:var(--text-2);
  padding:6px 0;transition:color .2s ease;white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--primary);transform:scaleX(0);transform-origin:left;
  transition:transform .2s cubic-bezier(.22,.61,.36,1);
}
.nav-link:hover{color:var(--primary)}
.nav-link.active{color:var(--text-1)}
.nav-link.active::after{transform:scaleX(1)}
.nav-toggle{
  width:44px;height:44px;display:inline-flex;flex-direction:column;
  align-items:center;justify-content:center;gap:6px;
  background:var(--glass-fill);border:1px solid var(--glass-stroke);
  border-radius:12px;cursor:pointer;transition:border-color .2s ease;
}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--text-1);transition:transform .25s ease,opacity .25s ease}
.nav-toggle:hover{border-color:rgba(20,227,200,.45)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(3.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.75px) rotate(-45deg)}
.mobile-panel{
  position:fixed;inset:72px 0 0 0;z-index:55;
  background:rgba(5,7,12,.92);
  -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  display:flex;flex-direction:column;padding:24px 24px 96px;
  opacity:0;pointer-events:none;transform:translateY(-8px);
  transition:opacity .3s ease,transform .3s ease;
}
.mobile-panel.open{opacity:1;pointer-events:auto;transform:none}
.mobile-panel a{
  font-size:20px;font-weight:600;color:var(--text-1);
  padding:18px 4px;border-bottom:1px solid var(--hairline);
  transition:color .2s ease;
}
.mobile-panel a:hover,.mobile-panel a.active{color:var(--primary)}
.mobile-panel .panel-cta{margin-top:28px;border-bottom:none;padding:0}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:999px;
  font-size:14.5px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;cursor:pointer;
  transition:background .22s ease,color .22s ease,box-shadow .22s ease,transform .18s ease,border-color .22s ease;
}
.btn-primary{
  background:var(--primary);color:#04140F;
  box-shadow:0 0 0 1px rgba(20,227,200,.35),0 8px 30px -8px rgba(20,227,200,.55);
}
.btn-primary:hover{
  background:#38F2DA;transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(20,227,200,.5),0 14px 40px -8px rgba(20,227,200,.7);
}
.btn-primary:active{transform:translateY(0);box-shadow:inset 0 2px 6px rgba(0,0,0,.35)}
.btn-ghost{
  background:var(--glass-fill);border-color:rgba(20,227,200,.4);color:var(--text-1);
}
.btn-ghost:hover{background:rgba(20,227,200,.10);border-color:var(--primary)}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{height:38px;padding:0 18px;font-size:13.5px}
.text-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--primary);position:relative;padding-bottom:2px;
}
.text-link::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;
  background:var(--primary);transform:scaleX(0);transform-origin:left;
  transition:transform .25s cubic-bezier(.22,.61,.36,1);
}
.text-link:hover::after{transform:scaleX(1)}

/* ---------- badge ---------- */
.badge{
  display:inline-flex;align-items:center;height:25px;padding:0 11px;
  border-radius:999px;font-size:12.5px;font-weight:600;letter-spacing:.02em;
  background:rgba(20,227,200,.12);color:var(--primary);
  border:1px solid rgba(20,227,200,.24);
}
.badge-muted{background:var(--glass-fill);border-color:var(--glass-stroke);color:var(--text-2)}
.badge-accent{background:rgba(255,90,31,.12);border-color:rgba(255,90,31,.3);color:#FF8A5C}

/* ---------- page head ---------- */
main{padding-top:72px}
.page-head{padding:56px 0 40px;position:relative;overflow:hidden}
.page-head::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(700px 320px at 12% -10%,rgba(20,227,200,.13),transparent 70%),
    radial-gradient(520px 260px at 92% 0%,rgba(255,90,31,.08),transparent 72%);
  pointer-events:none;
}
.page-head .wrap{position:relative;z-index:1}
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--text-3);margin-bottom:22px;
}
.crumb a{color:var(--text-2);transition:color .2s ease}
.crumb a:hover{color:var(--primary)}
.crumb .sep{color:var(--text-3);opacity:.6}
.crumb .current{
  color:var(--text-3);max-width:320px;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap;
}
.article-h1{
  font-size:clamp(30px,3.6vw,44px);line-height:1.3;font-weight:700;
  letter-spacing:-.01em;color:var(--text-1);margin:16px 0 20px;
  max-width:920px;
}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px;
  font-size:13px;color:var(--text-3);
}
.article-meta .dot{width:1px;height:12px;background:var(--hairline);display:inline-block}
.head-rule{height:1px;background:var(--hairline);margin-top:32px}

/* ---------- layout ---------- */
.article-section{padding:48px 0 24px}
.article-layout{
  display:grid;grid-template-columns:minmax(0,1fr);gap:48px;
}
@media(min-width:1024px){
  .article-layout{grid-template-columns:minmax(0,1fr) 288px;gap:64px}
}
.article-body{
  max-width:760px;font-size:16.5px;line-height:1.9;color:var(--text-1);
}
.article-body>*:first-child{margin-top:0}
.article-body p{margin:0 0 1.15em}
.article-body h2{
  font-size:24px;line-height:1.4;font-weight:700;color:var(--text-1);
  margin:40px 0 12px;padding-left:14px;position:relative;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.32em;bottom:.32em;width:3px;
  border-radius:2px;background:var(--primary);
}
.article-body h3{font-size:19px;line-height:1.5;font-weight:600;margin:28px 0 10px;color:var(--text-1)}
.article-body h4{font-size:17px;font-weight:600;margin:22px 0 8px;color:var(--text-1)}
.article-body ul{list-style:none;padding:0;margin:0 0 1.2em}
.article-body ul li{position:relative;padding-left:20px;margin-bottom:.6em}
.article-body ul li::before{
  content:"";position:absolute;left:2px;top:.72em;
  width:6px;height:6px;border-radius:1px;background:var(--primary);
}
.article-body ol{padding-left:1.5em;margin:0 0 1.2em}
.article-body ol li{margin-bottom:.6em}
.article-body ol li::marker{color:var(--primary);font-family:var(--font-mono)}
.article-body blockquote{
  margin:24px 0;padding:16px 20px;
  border-left:3px solid var(--primary);
  background:var(--glass-fill);
  border-radius:0 14px 14px 0;
  color:var(--text-2);font-size:15.5px;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{
  width:100%;height:auto;border-radius:16px;margin:26px auto;
  background:var(--ink-800);
}
.article-body figure{margin:26px 0}
.article-body figcaption{
  text-align:center;font-size:13px;color:var(--text-3);margin-top:10px;
}
.article-body a{color:var(--primary);border-bottom:1px solid rgba(20,227,200,.35);transition:border-color .2s ease}
.article-body a:hover{border-bottom-color:var(--primary)}
.article-body strong{color:#fff;font-weight:600}
.article-body hr{border:0;height:1px;background:var(--hairline);margin:36px 0}
.article-body table{
  width:100%;border-collapse:collapse;margin:24px 0;font-size:14.5px;
  border:1px solid var(--hairline);border-radius:12px;overflow:hidden;
}
.article-body th,.article-body td{
  border-bottom:1px solid var(--hairline);padding:11px 14px;text-align:left;
}
.article-body thead th{background:rgba(255,255,255,.045);color:var(--text-1);font-weight:600}
.article-body tbody tr:nth-child(even){background:rgba(255,255,255,.018)}
.article-body tbody tr:last-child td{border-bottom:none}
.article-body pre{
  background:var(--ink-800);border:1px solid var(--hairline);border-radius:12px;
  padding:16px 18px;overflow-x:auto;margin:24px 0;
  font-family:var(--font-mono);font-size:13.5px;line-height:1.75;color:var(--text-2);
}
.article-body code{
  font-family:var(--font-mono);font-size:.9em;
  background:rgba(255,255,255,.06);padding:2px 6px;border-radius:6px;color:#B9F5EA;
}
.article-body pre code{background:none;padding:0;color:inherit}

/* ---------- sidebar ---------- */
.article-side{position:relative}
.side-sticky{position:sticky;top:100px;display:flex;flex-direction:column;gap:20px}
.side-card{
  background:var(--glass-fill);
  border:1px solid var(--glass-stroke);
  border-radius:var(--radius-card);
  padding:22px;
  box-shadow:var(--shadow-deep);
}
.side-card h3{
  font-size:13px;font-weight:600;letter-spacing:.06em;
  color:var(--text-2);text-transform:none;margin-bottom:14px;
}
.side-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}
.side-list li{display:flex;gap:10px;font-size:14px;color:var(--text-2);line-height:1.65}
.side-list li .num{
  font-family:var(--font-mono);font-size:12.5px;color:var(--primary);
  flex-shrink:0;padding-top:2px;
}
.side-links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:2px}
.side-links a{
  display:flex;align-items:center;justify-content:space-between;
  font-size:14px;color:var(--text-2);padding:9px 0;
  border-bottom:1px solid var(--hairline);transition:color .2s ease,padding-left .2s ease;
}
.side-links li:last-child a{border-bottom:none}
.side-links a:hover{color:var(--primary);padding-left:4px}

/* ---------- tags / back ---------- */
.tail-bar{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:18px;margin-top:44px;padding-top:26px;border-top:1px solid var(--hairline);
  max-width:760px;
}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- related ---------- */
.related{padding:72px 0 8px}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:20px;margin-bottom:32px;flex-wrap:wrap;
}
.section-head h2{font-size:clamp(22px,2.4vw,28px);font-weight:700;line-height:1.4}
.section-head .sub{font-size:14px;color:var(--text-3);margin-top:6px}
.rel-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:768px){.rel-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1024px){.rel-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.rel-card{
  display:flex;flex-direction:column;
  background:var(--glass-fill);
  border:1px solid var(--glass-stroke);
  border-radius:var(--radius-card);
  overflow:hidden;
  transition:transform .3s cubic-bezier(.22,.61,.36,1),border-color .3s ease,box-shadow .3s ease;
  height:100%;
}
.rel-card:hover{
  transform:translateY(-2px);
  border-color:rgba(20,227,200,.35);
  box-shadow:var(--shadow-deep);
}
.rel-thumb{aspect-ratio:16/10;overflow:hidden;background:var(--ink-800);flex-shrink:0}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s cubic-bezier(.22,.61,.36,1)}
.rel-card:hover .rel-thumb img{transform:scale(1.03)}
.rel-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.rel-body h3{
  font-size:17px;font-weight:600;line-height:1.5;color:var(--text-1);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.rel-body p{
  font-size:14px;color:var(--text-2);line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.rel-meta{
  margin-top:auto;display:flex;align-items:center;gap:12px;
  font-size:12.5px;color:var(--text-3);
}
.rel-meta .dot{width:1px;height:11px;background:var(--hairline)}

/* ---------- cta band ---------- */
.cta-band{padding:64px 0 76px}
.cta-inner{
  background:
    radial-gradient(520px 220px at 88% 0%,rgba(20,227,200,.14),transparent 70%),
    var(--glass-fill);
  border:1px solid var(--glass-stroke);
  border-radius:var(--radius-card);
  padding:36px 32px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.cta-inner h2{font-size:clamp(20px,2.3vw,26px);font-weight:700;line-height:1.45}
.cta-inner p{font-size:14px;color:var(--text-2);margin-top:8px;max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- empty ---------- */
.empty-state{
  max-width:760px;
  background:var(--glass-fill);border:1px solid var(--glass-stroke);
  border-radius:var(--radius-card);padding:48px 28px;text-align:center;
}
.empty-state svg{color:var(--primary);opacity:.8;margin:0 auto 16px}
.empty-state p{font-size:15px;color:var(--text-2);margin-bottom:18px}

/* ---------- footer ---------- */
.site-footer{
  margin-top:72px;background:var(--ink-800);
  border-top:1px solid var(--hairline);padding:64px 0 26px;
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:1.7fr 1fr 1fr}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.7fr 1fr 1fr 1.2fr}}
.footer-grid h3{
  font-size:13.5px;font-weight:600;color:var(--text-1);
  letter-spacing:.05em;margin-bottom:16px;
}
.footer-grid p{
  font-size:13.5px;color:var(--text-3);line-height:1.85;
  margin-top:14px;max-width:330px;
}
.footer-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.footer-list a,.footer-list span{font-size:13.5px;color:var(--text-3);transition:color .2s ease}
.footer-list a:hover{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px;margin-top:48px;padding-top:20px;
  border-top:1px solid var(--hairline);font-size:13px;color:var(--text-3);
}

/* ---------- floating cta ---------- */
.floating-cta{
  position:fixed;right:28px;bottom:28px;z-index:70;
  display:flex;align-items:center;gap:10px;
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .35s ease,transform .35s ease;
}
.floating-cta.show{opacity:1;pointer-events:auto;transform:none}
@media(max-width:1023px){
  .floating-cta{
    left:0;right:0;bottom:0;gap:8px;
    padding:8px 14px calc(8px + env(safe-area-inset-bottom));
    background:rgba(5,7,12,.85);
    -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
    border-top:1px solid var(--hairline);
    transform:translateY(100%);
  }
  .floating-cta.show{transform:none}
  .floating-cta .btn-main{flex:1 1 70%;height:48px}
  .floating-cta .btn-side{flex:1 1 30%;height:48px;padding:0 12px;font-size:13px}
  body{padding-bottom:64px}
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s cubic-bezier(.22,.61,.36,1),transform .4s cubic-bezier(.22,.61,.36,1)}
.reveal.is-visible{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* roulang page: category1 */
:root{
  --ink-900:#05070C;
  --ink-800:#0A0F1A;
  --glass-fill:rgba(255,255,255,.045);
  --glass-stroke:rgba(255,255,255,.10);
  --hairline:rgba(255,255,255,.08);
  --primary:#14E3C8;
  --primary-dim:#0E9E8C;
  --accent:#FF5A1F;
  --text-1:#EAF0F6;
  --text-2:#9AA8B8;
  --text-3:#5F6B7A;
  --paper:#F4F6F8;
  --paper-text:#0B1118;
  --font-cn:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --r-lg:20px;
  --r-md:16px;
  --r-sm:12px;
  --shadow-soft:0 20px 60px -20px rgba(0,0,0,.6);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--text-1);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.nav-open{overflow:hidden}
img{max-width:100%;display:block}
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{margin:0;color:var(--text-1);letter-spacing:.01em}
p{margin:0 0 14px;color:var(--text-2);font-size:16px;line-height:1.85}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

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

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:44px;padding:0 22px;border-radius:999px;
  font-size:14.5px;font-weight:600;letter-spacing:.02em;white-space:nowrap;
  transition:transform .22s var(--ease),background .22s var(--ease),box-shadow .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn-primary{
  background:var(--primary);color:#04130F;
  box-shadow:0 0 0 1px rgba(20,227,200,.35),0 8px 30px -8px rgba(20,227,200,.55);
}
.btn-primary:hover{
  background:#3BEFDA;transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(20,227,200,.5),0 14px 38px -8px rgba(20,227,200,.68);
}
.btn-primary:active{transform:translateY(0) scale(.99);box-shadow:0 0 0 1px rgba(20,227,200,.4),inset 0 2px 6px rgba(0,0,0,.25)}
.btn-ghost{
  background:var(--glass-fill);border:1px solid rgba(20,227,200,.4);color:var(--text-1);
}
.btn-ghost:hover{background:rgba(20,227,200,.10);border-color:rgba(20,227,200,.6)}
.btn-sm{height:38px;padding:0 18px;font-size:13.5px}

.text-link{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--primary);transition:color .2s var(--ease);
}
.text-link::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--primary);
  transition:width .25s var(--ease);
}
.text-link:hover::after{width:100%}

/* ---------- 玻璃与标签 ---------- */
.glass{
  background:var(--glass-fill);
  border:1px solid var(--glass-stroke);
  border-radius:var(--r-lg);
  backdrop-filter:blur(14px) saturate(130%);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06),var(--shadow-soft);
}
.pill{
  display:inline-flex;align-items:center;gap:8px;height:26px;padding:0 12px;
  border-radius:999px;font-size:12.5px;color:var(--text-2);
  background:var(--glass-fill);border:1px solid var(--glass-stroke);
}
.pill::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--primary);flex:none}
.chip{
  display:inline-flex;align-items:center;width:fit-content;height:24px;padding:0 10px;
  border-radius:999px;font-size:12px;color:var(--primary);
  background:rgba(20,227,200,.12);border:1px solid rgba(20,227,200,.2);
}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:70;
  transition:background .3s var(--ease),backdrop-filter .3s var(--ease),border-color .3s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  background:rgba(5,7,12,.74);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom-color:var(--hairline);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text-1)}
.brand-mark{display:inline-flex;color:var(--primary);flex:none}
.brand-text{display:inline-flex;align-items:baseline;gap:4px;font-size:16px;font-weight:700;letter-spacing:.04em;line-height:1.2}
.brand-sub{font-size:11px;font-weight:500;letter-spacing:.06em;color:var(--text-2)}

.nav-link{
  position:relative;display:inline-block;padding:6px 0;font-size:14.5px;
  color:var(--text-2);letter-spacing:.02em;transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--primary);
  transition:width .25s var(--ease);
}
.nav-link:hover{color:var(--text-1)}
.nav-link:hover::after{width:100%}
.nav-link.active{color:var(--text-1)}
.nav-link.active::after{width:100%}

.header-actions{display:flex;align-items:center;gap:14px}
.menu-toggle{
  display:inline-flex;flex-direction:column;align-items:flex-end;justify-content:center;gap:6px;
  width:44px;height:44px;border-radius:12px;
}
.menu-toggle span{display:block;width:22px;height:1.5px;background:var(--text-1);transition:transform .25s var(--ease),background .2s}
.menu-toggle[aria-expanded="true"] span:first-child{transform:translateY(3.75px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span:last-child{transform:translateY(-3.75px) rotate(-45deg)}
@media (min-width:1024px){.menu-toggle{display:none}}
@media (max-width:519px){.header-cta{display:none}}

.mobile-panel{
  position:fixed;top:68px;left:0;right:0;bottom:0;z-index:65;
  display:none;flex-direction:column;padding:26px 20px 40px;
  background:rgba(5,7,12,.96);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  overflow-y:auto;
}
.mobile-panel.is-open{display:flex}
.mobile-panel a{padding:16px 0;font-size:20px;color:var(--text-1);border-bottom:1px solid var(--hairline)}
.mobile-panel a.is-current{color:var(--primary)}
.mobile-panel .btn{margin-top:24px;border-bottom:0;font-size:15px;justify-content:center}

/* ---------- 页头 ---------- */
.page-hero{position:relative;padding:136px 0 64px;overflow:hidden;border-bottom:1px solid var(--hairline)}
@media (min-width:768px){.page-hero{padding:162px 0 78px}}
.page-hero-bg{
  position:absolute;inset:0;opacity:.16;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:left center;background-repeat:no-repeat;
}
.page-hero-shade{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,7,12,.55) 0%,rgba(5,7,12,.86) 55%,rgba(5,7,12,.98) 100%);
}
.page-hero-inner{position:relative;z-index:2}
.crumb{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:22px;font-size:13px;color:var(--text-3)}
.crumb a{color:var(--text-3);transition:color .2s var(--ease)}
.crumb a:hover{color:var(--primary)}
.crumb .sep{color:var(--text-3);opacity:.7}
.crumb-current{color:var(--text-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:60vw}
.page-hero h1{
  margin-top:20px;font-size:clamp(30px,4.6vw,50px);line-height:1.25;font-weight:700;
  letter-spacing:.005em;max-width:900px;
}
.page-hero-desc{margin-top:18px;max-width:720px;font-size:16px;color:var(--text-2)}
.hero-meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:26px;font-size:13px;color:var(--text-3)}
.hero-meta i{display:inline-block;width:1px;height:12px;background:var(--hairline)}

/* ---------- 通用分区 ---------- */
.section{padding:56px 0}
@media (min-width:768px){.section{padding:92px 0}}
.sec-head{display:flex;flex-direction:column;gap:14px;margin-bottom:40px}
@media (min-width:1024px){.sec-head{flex-direction:row;align-items:flex-end;justify-content:space-between;gap:48px}}
.sec-index{font-size:12.5px;letter-spacing:.16em;color:var(--primary)}
h2.sec-title{font-size:clamp(22px,2.7vw,32px);line-height:1.35;font-weight:700;margin-top:10px}
.sec-sub{font-size:14.5px;line-height:1.8;color:var(--text-2);max-width:560px;margin:0}
.sec-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:36px;flex-wrap:wrap}

/* ---------- 分类页主体：左锚点 + 右条目流 ---------- */
.cat-layout{display:block}
@media (min-width:1024px){
  .cat-layout{display:grid;grid-template-columns:236px minmax(0,1fr);gap:60px;align-items:start}
}
.toc{padding:20px;border-radius:var(--r-md);margin-bottom:36px}
@media (min-width:1024px){
  .toc{position:sticky;top:96px;margin-bottom:0}
}
.toc-title{font-size:12.5px;letter-spacing:.14em;color:var(--text-3);margin:0 0 14px}
.toc-link{
  display:flex;align-items:baseline;gap:10px;padding:8px 0;font-size:13.5px;color:var(--text-2);
  border-bottom:1px dashed rgba(255,255,255,.06);transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.toc-link:last-child{border-bottom:0}
.toc-link .mono{font-size:12px;color:var(--text-3);transition:color .2s var(--ease)}
.toc-link:hover{color:var(--text-1);padding-left:2px}
.toc-link.active{color:var(--primary)}
.toc-link.active .mono{color:var(--primary)}

.entry-flow{min-width:0}
.entry{padding:34px 0;border-top:1px solid var(--hairline)}
.entry:first-child{border-top:0;padding-top:0}
.entry:last-child{padding-bottom:0}
.entry-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.entry-num{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  font-size:12px;letter-spacing:.1em;color:var(--primary);
  background:rgba(20,227,200,.10);border:1px solid rgba(20,227,200,.28);
}
.entry h2{font-size:20px;line-height:1.5;font-weight:600;margin:14px 0 12px}
.entry p{max-width:720px}
.entry p:last-child{margin-bottom:0}

.steps{margin-top:18px;display:flex;flex-direction:column;gap:12px;max-width:720px}
.steps li{display:flex;gap:12px;font-size:15px;line-height:1.8;color:var(--text-2)}
.step-idx{
  flex:none;width:22px;height:22px;margin-top:4px;border-radius:6px;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:11.5px;color:var(--primary);background:rgba(20,227,200,.10);
  border:1px solid rgba(20,227,200,.24);
}
.note{
  margin-top:20px;padding:16px 20px;max-width:720px;border-radius:0 var(--r-sm) var(--r-sm) 0;
  border-left:3px solid var(--primary);background:rgba(255,255,255,.04);
  font-size:14.5px;line-height:1.85;color:var(--text-2);
}
.note strong{color:var(--text-1);font-weight:600}
.entry-figure{margin:24px 0 0;max-width:720px}
.entry-figure img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--r-sm);background:var(--ink-800)}
.entry-figure figcaption{margin-top:10px;font-size:13px;color:var(--text-3);text-align:center;line-height:1.7}

.table-scroll{overflow-x:auto;margin-top:22px;max-width:720px}
.mini-table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:520px}
.mini-table th,.mini-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--hairline);color:var(--text-2);line-height:1.7}
.mini-table th{font-size:13px;font-weight:600;color:var(--text-1);background:rgba(255,255,255,.03);letter-spacing:.02em}
.mini-table tbody tr:nth-child(even){background:rgba(255,255,255,.02)}

/* ---------- 浅色数据带 ---------- */
.paper-band{background:var(--paper);color:var(--paper-text);padding:64px 0;margin:0}
@media (min-width:768px){.paper-band{padding:88px 0}}
.paper-band h2{color:var(--paper-text);font-size:clamp(22px,2.7vw,30px);line-height:1.35;font-weight:700;margin:0}
.paper-band p{color:rgba(11,17,24,.66);max-width:620px;margin:14px 0 0;font-size:15px;line-height:1.85}
.paper-band .mono{color:var(--paper-text)}
.stat-row{
  display:grid;grid-template-columns:repeat(2,1fr);margin-top:40px;
  border-top:1px solid rgba(11,17,24,.12);
}
.stat{padding:24px 18px;border-bottom:1px solid rgba(11,17,24,.12)}
@media (min-width:768px){
  .stat-row{grid-template-columns:repeat(4,1fr)}
  .stat{border-bottom:0;border-left:1px solid rgba(11,17,24,.12);padding:26px 22px}
  .stat:first-child{border-left:0}
}
.stat-num{display:block;font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(34px,4.4vw,50px);font-weight:700;line-height:1.1;letter-spacing:-.02em;color:var(--paper-text)}
.stat-label{display:block;margin-top:8px;font-size:13.5px;line-height:1.7;color:rgba(11,17,24,.6)}
.paper-foot{margin-top:32px;font-size:13.5px;color:rgba(11,17,24,.55);line-height:1.8}

/* ---------- 场景卡 ---------- */
.card-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:768px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr)}}
.scene-card{padding:26px;border-radius:var(--r-md);display:flex;flex-direction:column;gap:12px;transition:transform .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease)}
.scene-card:hover{transform:translateY(-2px);border-color:rgba(20,227,200,.34);box-shadow:0 24px 60px -24px rgba(0,0,0,.78)}
.scene-card h3{font-size:17.5px;font-weight:600;line-height:1.5}
.scene-card p{font-size:14.5px;line-height:1.8;margin:0}
.scene-card .text-link{margin-top:auto;padding-top:6px}

.content-card{
  display:flex;flex-direction:column;gap:12px;padding:20px;border-radius:var(--r-md);
  transition:transform .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.content-card:hover{transform:translateY(-2px);border-color:rgba(20,227,200,.34);box-shadow:0 24px 60px -24px rgba(0,0,0,.78)}
.card-cover{aspect-ratio:16/10;border-radius:var(--r-sm);overflow:hidden;background:var(--ink-800)}
.card-cover img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.content-card:hover .card-cover img{transform:scale(1.03)}
.content-card h3{font-size:17px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.content-card p{font-size:14px;line-height:1.8;margin:0;color:var(--text-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{font-size:12.5px;color:var(--text-3);margin-top:auto}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:780px;margin:0 auto}
.faq-list{margin-top:30px;border-top:1px solid var(--hairline)}
.faq-item{border-bottom:1px solid var(--hairline)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:20px;width:100%;
  padding:20px 4px;text-align:left;font-size:17px;font-weight:600;line-height:1.6;color:var(--text-1);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--primary)}
.faq-icon{
  flex:none;display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;font-size:16px;font-weight:400;color:var(--primary);
  font-family:var(--font-mono);
}
.faq-a{max-height:0;overflow:hidden;transition:max-height .38s var(--ease)}
.faq-a p{padding:0 4px 20px;margin:0;font-size:15px;line-height:1.9;color:var(--text-2);max-width:700px}

/* ---------- 尾部 CTA ---------- */
.cta-band{padding:0 0 72px}
@media (min-width:768px){.cta-band{padding:0 0 96px}}
.cta-inner{
  display:flex;flex-direction:column;gap:22px;padding:30px 26px;border-radius:var(--r-lg);
}
@media (min-width:1024px){
  .cta-inner{flex-direction:row;align-items:center;justify-content:space-between;padding:40px 44px;gap:40px}
}
.cta-inner h2{font-size:clamp(21px,2.4vw,28px);font-weight:700;line-height:1.4}
.cta-inner p{margin:10px 0 0;font-size:14.5px;max-width:560px}
.cta-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}

/* ---------- 浮动 CTA ---------- */
.float-cta{
  position:fixed;right:24px;bottom:24px;z-index:60;display:flex;gap:10px;
  opacity:0;pointer-events:none;transform:translateY(8px);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}
.float-cta.is-visible{opacity:1;pointer-events:auto;transform:none}
@media (max-width:767px){
  .float-cta{
    left:0;right:0;bottom:0;gap:8px;padding:8px 16px calc(8px + env(safe-area-inset-bottom));
    background:rgba(5,7,12,.82);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    border-top:1px solid var(--hairline);
  }
  .float-cta .btn{height:48px}
  .float-cta .btn-primary{flex:7 1 0;min-width:0}
  .float-cta .btn-ghost{flex:3 1 0;min-width:0}
  body{padding-bottom:76px}
}

/* ---------- 页脚 ---------- */
.site-footer{
  border-top:1px solid var(--hairline);
  background:var(--ink-800);
  padding:60px 0 26px;
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px}
@media (min-width:768px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}}
.site-footer h3{font-size:14px;font-weight:600;color:var(--text-1);margin:0 0 14px;letter-spacing:.04em}
.site-footer p{font-size:13.5px;line-height:1.9;color:var(--text-3);margin:16px 0 0;max-width:340px}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-list a,.footer-list span{font-size:13.5px;color:var(--text-3);line-height:1.7}
.footer-list a{position:relative;display:inline-block;transition:color .2s var(--ease)}
.footer-list a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;background:var(--primary);
  transition:width .25s var(--ease);
}
.footer-list a:hover{color:var(--primary)}
.footer-list a:hover::after{width:100%}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:46px;padding-top:20px;border-top:1px solid var(--hairline);
  font-size:12.5px;color:var(--text-3);
}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* roulang page: category2 */
:root{
  --ink-900:#05070C;
  --ink-800:#0A0F1A;
  --glass-fill:rgba(255,255,255,.045);
  --glass-stroke:rgba(255,255,255,.10);
  --hairline:rgba(255,255,255,.08);
  --primary:#14E3C8;
  --primary-dim:#0E9E8C;
  --accent:#FF5A1F;
  --text-1:#EAF0F6;
  --text-2:#9AA8B8;
  --text-3:#5F6B7A;
  --paper:#F4F6F8;
  --paper-text:#0B1118;
  --radius-lg:20px;
  --radius-md:16px;
  --radius-sm:12px;
  --shadow-soft:0 20px 60px -20px rgba(0,0,0,.6);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans 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;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none;transition:color .22s var(--ease)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.005em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
.mono,time,.num{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-variant-numeric:tabular-nums}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.wrap{padding:0 32px}}
.hairline{border-top:1px solid var(--hairline)}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  transition:background .3s var(--ease),backdrop-filter .3s var(--ease),border-color .3s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(5,7,12,.78);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom-color:var(--hairline);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px;gap:24px}
.brand{display:inline-flex;align-items:center;gap:11px;color:var(--text-1)}
.brand-mark{display:inline-flex;color:var(--primary);flex:none}
.brand-text{font-size:18px;font-weight:700;line-height:1.1;letter-spacing:.02em;white-space:nowrap}
.brand-sub{
  display:block;font-size:10.5px;font-weight:400;color:var(--text-3);
  letter-spacing:.14em;margin-top:3px;
}
.nav-link{
  position:relative;font-size:14.5px;color:var(--text-2);padding:6px 0;
}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:100%;
  background:var(--primary);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--primary)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--text-1)}
.nav-link.active::after{transform:scaleX(1)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:999px;font-size:14.5px;font-weight:600;
  transition:transform .2s var(--ease),box-shadow .25s var(--ease),background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
  white-space:nowrap;
}
.btn-primary{
  background:var(--primary);color:#04211D;border:1px solid rgba(20,227,200,.5);
  box-shadow:0 0 0 1px rgba(20,227,200,.35),0 8px 30px -8px rgba(20,227,200,.55);
}
.btn-primary:hover{
  background:#38F0D8;transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(20,227,200,.5),0 14px 40px -8px rgba(20,227,200,.7);
}
.btn-primary:active{transform:translateY(0);box-shadow:0 0 0 1px rgba(20,227,200,.4),0 3px 12px -6px rgba(20,227,200,.5)}
.btn-ghost{
  background:var(--glass-fill);color:var(--text-1);
  border:1px solid rgba(20,227,200,.4);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
}
.btn-ghost:hover{background:rgba(20,227,200,.1);border-color:rgba(20,227,200,.75);color:var(--primary)}
.btn-sm{height:38px;padding:0 18px;font-size:13.5px}
.btn-block{width:100%}
.link-underline{position:relative;display:inline-flex;align-items:center;gap:6px;color:var(--primary);font-size:14.5px}
.link-underline::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:100%;
  background:var(--primary);transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease);
}
.link-underline:hover::after{transform:scaleX(1)}
.burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;align-items:center;border-radius:12px}
.burger span{display:block;width:20px;height:1.5px;background:var(--text-1);transition:transform .25s var(--ease),opacity .25s var(--ease)}
.burger.open span:first-child{transform:translateY(3.25px) rotate(45deg)}
.burger.open span:last-child{transform:translateY(-3.25px) rotate(-45deg)}
.mobile-panel{
  position:fixed;inset:74px 0 0 0;z-index:55;
  background:rgba(5,7,12,.94);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  padding:28px 24px 40px;
  transform:translateY(-8px);opacity:0;pointer-events:none;
  transition:opacity .25s var(--ease),transform .25s var(--ease);
}
.mobile-panel.open{opacity:1;transform:none;pointer-events:auto}
.mobile-panel a{display:block;font-size:20px;padding:18px 0;border-bottom:1px solid var(--hairline);color:var(--text-1)}
.mobile-panel a.active{color:var(--primary)}
.mobile-panel .btn{margin-top:26px;height:48px;font-size:16px}

/* ---------- page head ---------- */
.page-head{position:relative;padding:150px 0 76px;overflow:hidden}
.page-head::before{
  content:"";position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:left center;
  opacity:.16;filter:saturate(.9);
}
.page-head::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,7,12,.72) 0%,rgba(5,7,12,.9) 55%,var(--ink-900) 100%);
}
.page-head .wrap{position:relative;z-index:2}
.crumbs{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--text-3);margin-bottom:22px;flex-wrap:wrap}
.crumbs a{color:var(--text-2)}
.crumbs a:hover{color:var(--primary)}
.crumbs .sep{color:var(--text-3);opacity:.7}
.crumbs .cur{color:var(--text-3);max-width:min(60vw,320px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pill{
  display:inline-flex;align-items:center;gap:7px;height:26px;padding:0 13px;border-radius:999px;
  font-size:12.5px;letter-spacing:.04em;color:var(--primary);
  background:rgba(20,227,200,.12);border:1px solid rgba(20,227,200,.28);
}
.pill-accent{color:#FFD9C7;background:rgba(255,90,31,.14);border-color:rgba(255,90,31,.35)}
.pill-glass{color:var(--text-2);background:var(--glass-fill);border:1px solid var(--glass-stroke)}
.page-head h1{font-size:clamp(30px,4.6vw,52px);line-height:1.25;font-weight:700;margin:20px 0 0;max-width:15em}
.page-head .lead{color:var(--text-2);font-size:16px;line-height:1.9;max-width:640px;margin-top:18px}
.head-rule{margin-top:36px;border-top:1px solid var(--hairline);padding-top:18px;display:flex;gap:26px;flex-wrap:wrap;color:var(--text-3);font-size:13px}
.head-rule span{display:inline-flex;align-items:center;gap:8px}
.head-rule b{color:var(--text-1);font-weight:600}

/* ---------- filter bar ---------- */
.filter-bar{
  position:sticky;top:74px;z-index:40;
  background:rgba(5,7,12,.82);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);
}
.filter-scroll{
  display:flex;gap:10px;overflow-x:auto;padding:14px 0;scrollbar-width:none;
}
.filter-scroll::-webkit-scrollbar{display:none}
.chip{
  flex:none;display:inline-flex;align-items:center;height:34px;padding:0 16px;border-radius:999px;
  font-size:13.5px;color:var(--text-2);background:var(--glass-fill);
  border:1px solid var(--glass-stroke);transition:all .2s var(--ease);
}
.chip:hover{color:var(--primary);border-color:rgba(20,227,200,.45);background:rgba(20,227,200,.08)}
.chip.current{color:#04211D;background:var(--primary);border-color:var(--primary);font-weight:600}

/* ---------- sections ---------- */
.section{padding:72px 0}
@media(min-width:1024px){.section{padding:104px 0}}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;flex-wrap:wrap;margin-bottom:40px}
.section-head h2{font-size:clamp(24px,3vw,34px);line-height:1.35;max-width:16em}
.section-head p{color:var(--text-2);font-size:15px;margin-top:12px;max-width:620px}
.sec-no{font-family:ui-monospace,monospace;font-size:13px;color:var(--text-3);letter-spacing:.16em;display:flex;align-items:center;gap:14px}
.sec-no::after{content:"";display:block;width:56px;height:1px;background:var(--hairline)}

/* ---------- card grid ---------- */
.card-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:768px){.card-grid{grid-template-columns:repeat(2,1fr);gap:28px}}
.topic-card{
  display:flex;flex-direction:column;
  border-radius:var(--radius-lg);overflow:hidden;
  background:var(--glass-fill);
  border:1px solid var(--glass-stroke);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.topic-card:hover{transform:translateY(-2px);border-color:rgba(20,227,200,.35);box-shadow:var(--shadow-soft)}
.topic-card .thumb{
  position:relative;aspect-ratio:16/10;background:var(--ink-800);overflow:hidden;
}
.topic-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.topic-card:hover .thumb img{transform:scale(1.03)}
.topic-card .body{padding:24px 26px 26px;display:flex;flex-direction:column;gap:12px;flex:1}
.topic-card h3{font-size:17.5px;line-height:1.5;font-weight:600}
.topic-card p{color:var(--text-2);font-size:14.5px;line-height:1.8}
.topic-card .meta{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  margin-top:auto;padding-top:14px;border-top:1px solid var(--hairline);
  font-size:12.5px;color:var(--text-3);
}
.topic-card .meta .dot{color:var(--text-3);opacity:.6}

/* ---------- light band ---------- */
.light-band{
  grid-column:1/-1;
  background:var(--paper);color:var(--paper-text);
  border-radius:var(--radius-lg);padding:30px 32px;
  display:flex;align-items:center;gap:26px;flex-wrap:wrap;justify-content:space-between;
}
.light-band .band-text{max-width:640px}
.light-band h3{font-size:19px;line-height:1.5;color:var(--paper-text)}
.light-band p{color:#41505F;font-size:14.5px;margin-top:8px;line-height:1.8}
.light-band .num{font-size:40px;font-weight:700;color:var(--primary-dim);line-height:1}
.btn-paper{
  display:inline-flex;align-items:center;justify-content:center;
  height:44px;padding:0 22px;border-radius:999px;font-size:14.5px;font-weight:600;
  background:var(--paper-text);color:var(--paper);border:1px solid var(--paper-text);
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.btn-paper:hover{opacity:.86;transform:translateY(-1px)}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:1fr;gap:0;border-top:1px solid var(--hairline)}
@media(min-width:768px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.steps{grid-template-columns:repeat(4,1fr)}}
.step{padding:28px 24px 32px;border-bottom:1px solid var(--hairline);position:relative}
@media(min-width:768px){
  .step{border-right:1px solid var(--hairline)}
  .step:nth-child(2n){border-right:0}
}
@media(min-width:1024px){
  .step{border-right:1px solid var(--hairline)}
  .step:nth-child(2n){border-right:1px solid var(--hairline)}
  .step:nth-child(4n){border-right:0}
}
.step .idx{font-family:ui-monospace,monospace;font-size:12.5px;letter-spacing:.18em;color:var(--primary)}
.step h3{font-size:17px;font-weight:600;margin-top:14px}
.step p{color:var(--text-2);font-size:14.5px;margin-top:10px}
.step::after{
  content:"";position:absolute;left:0;top:0;width:32px;height:2px;background:var(--primary);opacity:.7;
}

/* ---------- faq ---------- */
.faq-wrap{max-width:760px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--hairline)}
.faq-q{
  width:100%;display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
  padding:22px 0;text-align:left;font-size:17px;font-weight:600;color:var(--text-1);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--primary)}
.faq-sign{flex:none;font-family:ui-monospace,monospace;font-size:17px;color:var(--primary);width:18px;text-align:center;line-height:1.6}
.faq-a{max-height:0;overflow:hidden;transition:max-height .34s var(--ease)}
.faq-a p{color:var(--text-2);font-size:15px;padding:0 0 24px;max-width:660px}

/* ---------- cta ---------- */
.cta-band{
  border-radius:var(--radius-lg);
  background:var(--glass-fill);
  border:1px solid var(--glass-stroke);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.07);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  padding:34px 32px;
  display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap;
}
.cta-band h2{font-size:clamp(21px,2.4vw,27px);line-height:1.4;max-width:20em}
.cta-band .note{color:var(--text-3);font-size:13px;margin-top:10px}
.cta-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}

/* ---------- related ---------- */
.related-grid{display:grid;grid-template-columns:1fr;gap:22px}
@media(min-width:768px){.related-grid{grid-template-columns:repeat(3,1fr)}}
.mini-card{
  display:flex;gap:16px;align-items:flex-start;
  padding:18px;border-radius:var(--radius-md);
  background:var(--glass-fill);border:1px solid var(--glass-stroke);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.mini-card:hover{border-color:rgba(20,227,200,.35);transform:translateY(-2px)}
.mini-card .mini-thumb{flex:none;width:84px;aspect-ratio:16/10;border-radius:10px;overflow:hidden;background:var(--ink-800)}
.mini-card .mini-thumb img{width:100%;height:100%;object-fit:cover}
.mini-card h3{font-size:15px;font-weight:600;line-height:1.55}
.mini-card span{display:block;color:var(--text-3);font-size:12.5px;margin-top:8px}

/* ---------- footer ---------- */
.site-footer{margin-top:24px;border-top:1px solid var(--hairline);background:var(--ink-800)}
.site-footer .wrap{padding-top:60px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:44px}}
.footer-grid h3{font-size:14px;font-weight:600;color:var(--text-1);margin-bottom:16px;letter-spacing:.03em}
.footer-grid p{color:var(--text-3);font-size:13.5px;line-height:1.9;margin-top:16px;max-width:340px}
.footer-list li{margin-bottom:11px}
.footer-list a,.footer-list span{color:var(--text-3);font-size:13.5px;position:relative}
.footer-list a:hover{color:var(--primary)}
.footer-list a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:100%;background:var(--primary);
  transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease);
}
.footer-list a:hover::after{transform:scaleX(1)}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid var(--hairline);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  color:var(--text-3);font-size:12.5px;
}

/* ---------- float cta ---------- */
.float-cta{
  position:fixed;right:28px;bottom:28px;z-index:50;
  display:flex;align-items:center;gap:10px;
  padding:8px;border-radius:999px;
  background:rgba(10,15,26,.82);
  border:1px solid var(--glass-stroke);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:var(--shadow-soft);
  opacity:0;transform:translateY(14px);pointer-events:none;
  transition:opacity .34s var(--ease),transform .34s var(--ease);
}
.float-cta.show{opacity:1;transform:none;pointer-events:auto}
.mobile-cta{
  position:fixed;left:0;right:0;bottom:0;z-index:58;
  display:none;align-items:center;gap:12px;
  padding:8px 14px calc(8px + env(safe-area-inset-bottom));
  min-height:56px;
  background:rgba(10,15,26,.86);
  border-top:1px solid var(--glass-stroke);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  transform:translateY(110%);transition:transform .34s var(--ease);
}
.mobile-cta.show{transform:none}
.mobile-cta .btn-primary{flex:1 1 70%;height:48px}
.mobile-cta .btn-ghost{flex:0 0 auto;height:48px;padding:0 16px}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

@media(max-width:1023px){
  .float-cta{display:none}
  .mobile-cta{display:flex}
  .site-footer{padding-bottom:68px}
}
@media(max-width:767px){
  .page-head{padding:120px 0 56px}
  .head-rule{gap:16px}
  .light-band{padding:24px 22px}
  .cta-band{padding:26px 22px}
  .section{padding:56px 0}
}