/* roulang page: index */
:root{
  --bg:#050a16;
  --bg-soft:#0a1226;
  --bg-deep:#030711;
  --panel:rgba(255,255,255,.045);
  --panel-2:rgba(255,255,255,.075);
  --border:rgba(122,168,255,.16);
  --border-strong:rgba(122,182,255,.42);
  --text:#e9f1ff;
  --muted:#9db0cf;
  --muted-2:#7386a6;
  --brand:#3d8bff;
  --brand-deep:#1f63d6;
  --accent:#25e0d0;
  --warn:#ffcc66;
  --glow:0 0 0 1px rgba(61,139,255,.35), 0 14px 34px rgba(31,99,214,.42);
  --radius:14px;
  --radius-sm:10px;
  --radius-lg:22px;
  --shadow:0 18px 44px rgba(2,8,22,.62);
  --container:1180px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(61,139,255,.20), transparent 62%),
    radial-gradient(900px 520px at 92% 4%, rgba(37,224,208,.13), transparent 60%),
    linear-gradient(180deg,#050a16 0%,#060d1e 46%,#040914 100%);
  background-attachment:fixed;
  min-height:100vh;
}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color .2s ease;}
a:hover{color:#bcd8ff;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(5,10,22,.72);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(122,168,255,.12);
  transition:box-shadow .25s ease,background .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
  background:rgba(5,10,22,.92);
  box-shadow:0 12px 30px rgba(2,8,22,.55);
  border-bottom-color:rgba(122,182,255,.26);
}
.header-inner{display:flex;align-items:center;gap:26px;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:.4px;white-space:nowrap;}
.brand-mark{
  width:32px;height:32px;border-radius:9px;flex:0 0 auto;
  display:grid;place-items:center;
  background:linear-gradient(140deg,rgba(61,139,255,.95),rgba(37,224,208,.9));
  color:#04101f;font-size:15px;font-weight:900;
  box-shadow:0 8px 20px rgba(37,224,208,.28);
}
.brand-text{color:#f2f7ff;}
.brand-text span{color:var(--accent);}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-link{
  padding:8px 14px;border-radius:9px;font-size:15px;color:var(--muted);
  border:1px solid transparent;transition:all .2s ease;white-space:nowrap;
}
.nav-link:hover{color:#fff;background:rgba(61,139,255,.14);border-color:rgba(122,182,255,.22);}
.nav-link.active{
  color:#eaf3ff;background:rgba(61,139,255,.20);
  border-color:rgba(122,182,255,.42);
  box-shadow:inset 0 0 18px rgba(61,139,255,.20);
}
.nav-cta{
  margin-left:14px;padding:10px 20px;border-radius:10px;font-size:15px;font-weight:700;
  background:linear-gradient(135deg,#3d8bff,#22c8dd);color:#03101f;
  box-shadow:var(--glow);transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;
  white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-2px);filter:brightness(1.08);color:#03101f;box-shadow:0 0 0 1px rgba(61,139,255,.55),0 18px 38px rgba(31,99,214,.55);}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;
  border:1px solid var(--border);background:rgba(255,255,255,.05);
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:#cfe2ff;border-radius:2px;transition:.25s;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ============ Buttons / Tags ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:10px;font-size:15px;font-weight:700;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;
  min-height:44px;
}
.btn-primary{
  background:linear-gradient(135deg,#3d8bff,#1f63d6);
  color:#f2f8ff;box-shadow:var(--glow);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 0 1px rgba(61,139,255,.6),0 20px 42px rgba(31,99,214,.6);color:#fff;}
.btn-ghost{
  border:1px solid var(--border-strong);color:#d8e7ff;background:rgba(255,255,255,.03);
}
.btn-ghost:hover{background:rgba(61,139,255,.16);border-color:#6fb0ff;transform:translateY(-3px);color:#fff;}
.btn-sm{padding:9px 18px;font-size:14px;min-height:40px;border-radius:9px;}
.tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 14px;border-radius:999px;font-size:13px;color:#b8d3f6;
  background:rgba(61,139,255,.12);border:1px solid rgba(122,182,255,.24);
}
.tag-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);}
.badge{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;
  color:#9fe9ff;background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:1.6px;
  color:#8fc2ff;text-transform:uppercase;font-weight:700;
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--accent));}

/* ============ Sections ============ */
.section{padding:78px 0;position:relative;}
.section--alt{background:linear-gradient(180deg,rgba(10,18,38,.85),rgba(5,10,22,.35));border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section--deep{background:radial-gradient(900px 400px at 50% 0%,rgba(31,99,214,.20),transparent 70%),rgba(3,7,17,.72);border-top:1px solid rgba(122,168,255,.10);}
.section-head{max-width:780px;margin-bottom:36px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-title{font-size:29px;line-height:1.35;font-weight:800;letter-spacing:.3px;margin:12px 0 12px;}
.section-title em{font-style:normal;color:var(--accent);}
.section-desc{font-size:15px;color:var(--muted);line-height:1.85;}

/* ============ Hero ============ */
.hero{
  position:relative;overflow:hidden;padding:70px 0 64px;
  border-bottom:1px solid rgba(122,168,255,.12);
}
.hero-bg{
  position:absolute;inset:0;background-image:url('/assets/images/fb04b280eb5510aa.gif');
  background-size:cover;background-position:center;opacity:.20;filter:saturate(.9);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,10,22,.55),rgba(5,10,22,.94) 72%,#050a16 100%);
}
.hero-inner{position:relative;z-index:2;}
.hero-head{max-width:880px;margin-bottom:42px;}
.hero h1{
  font-size:42px;line-height:1.28;font-weight:900;letter-spacing:.5px;margin:16px 0 18px;
  background:linear-gradient(120deg,#ffffff 12%,#a9cdff 58%,#7ff0e4 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-lead{font-size:16px;color:#adc1de;line-height:1.9;max-width:820px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px;}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
.compare-col{
  padding:26px;border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(255,255,255,.065),rgba(255,255,255,.02));
  border:1px solid var(--border);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  box-shadow:var(--shadow);transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.compare-col:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 24px 54px rgba(2,8,22,.7);}
.compare-col.is-after{border-color:rgba(37,224,208,.42);box-shadow:0 0 0 1px rgba(37,224,208,.22),0 22px 50px rgba(2,8,22,.68);}
.compare-label{font-size:13px;font-weight:800;letter-spacing:1.4px;color:var(--muted-2);text-transform:uppercase;}
.compare-col.is-after .compare-label{color:var(--accent);}
.compare-title{font-size:21px;font-weight:800;margin:10px 0 16px;}
.compare-list li{
  display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:#b7c9e5;
  padding:9px 0;border-bottom:1px dashed rgba(122,168,255,.14);line-height:1.7;
}
.compare-list li:last-child{border-bottom:0;}
.dot-no,.dot-yes{
  flex:0 0 auto;width:20px;height:20px;border-radius:50%;display:grid;place-items:center;
  font-size:12px;font-weight:900;margin-top:3px;
}
.dot-no{background:rgba(255,120,140,.14);color:#ff9db0;border:1px solid rgba(255,120,140,.32);}
.dot-yes{background:rgba(37,224,208,.16);color:#7ff0e4;border:1px solid rgba(37,224,208,.40);}

/* ============ Grids & Cards ============ */
.grid{display:grid;gap:20px;}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr));}
.card{
  position:relative;padding:26px;border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(255,255,255,.062),rgba(255,255,255,.018));
  border:1px solid var(--border);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  box-shadow:0 12px 30px rgba(2,8,22,.45);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 22px 48px rgba(2,8,22,.68);}
.card-icon{
  width:44px;height:44px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;
  background:rgba(61,139,255,.14);border:1px solid rgba(122,182,255,.28);color:#8fc2ff;
}
.card-icon svg{width:22px;height:22px;}
.card h3{font-size:18px;font-weight:800;margin-bottom:10px;letter-spacing:.2px;}
.card p{font-size:14.5px;color:var(--muted);line-height:1.8;}
.card-foot{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px;}
.chip{font-size:12px;padding:3px 10px;border-radius:6px;background:rgba(255,255,255,.06);color:#a9c3e2;border:1px solid rgba(122,168,255,.16);}

/* ============ Scene matrix ============ */
.scene-card{padding:0;overflow:hidden;}
.scene-thumb{aspect-ratio:16/9;overflow:hidden;border-bottom:1px solid var(--border);}
.scene-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease;}
.scene-card:hover .scene-thumb img{transform:scale(1.05);}
.scene-body{padding:22px 24px 26px;}
.scene-body h3{font-size:17px;font-weight:800;margin-bottom:8px;}
.scene-body p{font-size:14px;color:var(--muted);line-height:1.78;}

/* ============ Steps ============ */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;counter-reset:step;}
.step{
  position:relative;padding:26px 22px;border-radius:var(--radius);
  background:linear-gradient(170deg,rgba(61,139,255,.13),rgba(255,255,255,.02));
  border:1px solid var(--border);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.step:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 20px 44px rgba(2,8,22,.6);}
.step-num{
  font-size:13px;font-weight:900;letter-spacing:2px;color:#7ff0e4;margin-bottom:12px;display:block;
}
.step h3{font-size:17px;font-weight:800;margin-bottom:9px;}
.step p{font-size:14px;color:var(--muted);line-height:1.78;}

/* ============ Demo ============ */
.demo-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:stretch;}
.demo-stage{
  border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);
  box-shadow:var(--shadow);position:relative;background:#081025;
}
.demo-stage img{width:100%;height:100%;object-fit:cover;min-height:320px;}
.demo-stage figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:16px 20px;font-size:13px;color:#c9dcf6;
  background:linear-gradient(180deg,transparent,rgba(3,8,20,.92));
}
.demo-panel{
  border-radius:var(--radius-lg);padding:26px;border:1px solid rgba(37,224,208,.28);
  background:linear-gradient(165deg,rgba(37,224,208,.09),rgba(255,255,255,.02));
  box-shadow:0 18px 44px rgba(2,8,22,.6);
}
.demo-panel h3{font-size:19px;font-weight:800;margin-bottom:14px;}
.result-row{
  display:flex;justify-content:space-between;gap:14px;align-items:center;
  padding:12px 0;border-bottom:1px dashed rgba(122,168,255,.16);font-size:14.5px;
}
.result-row:last-child{border-bottom:0;}
.result-row span:first-child{color:var(--muted);}
.result-row strong{color:#eaf6ff;font-weight:800;}
.result-row strong.hl{color:#7ff0e4;}

/* ============ Metrics ============ */
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;}
.metric{
  padding:26px 22px;border-radius:var(--radius);text-align:center;
  background:rgba(255,255,255,.04);border:1px solid var(--border);
  transition:border-color .2s ease,transform .2s ease;
}
.metric:hover{transform:translateY(-3px);border-color:var(--border-strong);}
.metric-num{
  font-size:34px;font-weight:900;letter-spacing:1px;
  background:linear-gradient(120deg,#8fc2ff,#7ff0e4);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.metric-label{font-size:14px;color:var(--muted);margin-top:6px;}

/* ============ Testimonials ============ */
.quote-card{position:relative;}
.quote-card::before{
  content:"“";position:absolute;top:8px;right:20px;font-size:64px;line-height:1;
  color:rgba(61,139,255,.22);font-family:Georgia,serif;
}
.quote-text{font-size:15px;color:#c3d5ee;line-height:1.85;margin-bottom:18px;}
.quote-author{display:flex;align-items:center;gap:12px;}
.avatar{
  width:40px;height:40px;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(140deg,rgba(61,139,255,.85),rgba(37,224,208,.8));
  color:#04101f;font-weight:900;font-size:15px;
}
.quote-name{font-size:14.5px;font-weight:700;}
.quote-role{font-size:12.5px;color:var(--muted-2);}

/* ============ Plans ============ */
.plan-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;align-items:stretch;}
.plan{
  padding:28px 26px;border-radius:var(--radius-lg);display:flex;flex-direction:column;
  background:linear-gradient(170deg,rgba(255,255,255,.055),rgba(255,255,255,.015));
  border:1px solid var(--border);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.plan:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 22px 48px rgba(2,8,22,.6);}
.plan.is-featured{
  border-color:rgba(37,224,208,.45);
  background:linear-gradient(170deg,rgba(37,224,208,.12),rgba(61,139,255,.08));
  box-shadow:0 0 0 1px rgba(37,224,208,.22),0 24px 56px rgba(2,8,22,.66);
}
.plan-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:6px;}
.plan-name{font-size:18px;font-weight:800;}
.plan-price{font-size:26px;font-weight:900;margin:10px 0 4px;color:#eaf6ff;}
.plan-price small{font-size:13px;font-weight:600;color:var(--muted-2);margin-left:4px;}
.plan-note{font-size:13px;color:var(--muted-2);margin-bottom:18px;}
.plan-list li{display:flex;gap:9px;font-size:14px;color:#b9cbe6;padding:7px 0;line-height:1.68;}
.plan-list li::before{content:"";flex:0 0 auto;width:6px;height:6px;border-radius:50%;background:var(--brand);margin-top:9px;box-shadow:0 0 8px rgba(61,139,255,.8);}
.plan.is-featured .plan-list li::before{background:var(--accent);box-shadow:0 0 8px rgba(37,224,208,.85);}
.plan-foot{margin-top:auto;padding-top:20px;}
.plan-foot .btn{width:100%;}

/* ============ Channel cards ============ */
.channel-card{
  display:block;padding:28px;border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(61,139,255,.14),rgba(255,255,255,.02));
  border:1px solid var(--border);transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.channel-card:hover{transform:translateY(-5px);border-color:rgba(37,224,208,.5);box-shadow:0 24px 52px rgba(2,8,22,.7);}
.channel-index{font-size:12px;font-weight:900;letter-spacing:2px;color:#7ff0e4;}
.channel-card h3{font-size:19px;font-weight:800;margin:10px 0 10px;}
.channel-card p{font-size:14px;color:var(--muted);line-height:1.78;}
.channel-link{margin-top:16px;display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:700;color:#8fc2ff;}
.channel-card:hover .channel-link{color:#7ff0e4;}

/* ============ Posts ============ */
.post-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.post-card{
  display:flex;flex-direction:column;padding:24px;border-radius:var(--radius);
  background:rgba(255,255,255,.04);border:1px solid var(--border);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.post-card:hover{transform:translateY(-4px);border-color:var(--border-strong);background:rgba(61,139,255,.10);box-shadow:0 22px 46px rgba(2,8,22,.62);}
.post-meta{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:12.5px;color:var(--muted-2);}
.post-title{font-size:16.5px;font-weight:800;line-height:1.55;margin-bottom:10px;color:#eef5ff;}
.post-excerpt{font-size:14px;color:var(--muted);line-height:1.78;flex:1;}
.post-more{margin-top:16px;font-size:13.5px;font-weight:700;color:#8fc2ff;}
.post-card:hover .post-more{color:#7ff0e4;}
.empty-tip{
  padding:26px;border-radius:var(--radius);border:1px dashed rgba(122,168,255,.3);
  color:var(--muted);font-size:14.5px;text-align:center;background:rgba(255,255,255,.02);
}
.list-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;}
.list-item{
  display:flex;gap:14px;padding:18px 20px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:rgba(255,255,255,.035);
  transition:border-color .2s ease,transform .2s ease,background .2s ease;
}
.list-item:hover{border-color:var(--border-strong);transform:translateY(-3px);background:rgba(61,139,255,.10);}
.list-num{font-size:13px;font-weight:900;color:#7ff0e4;letter-spacing:1px;flex:0 0 auto;padding-top:2px;}
.list-item h4{font-size:15px;font-weight:800;margin-bottom:6px;line-height:1.55;}
.list-item p{font-size:13.5px;color:var(--muted);line-height:1.7;}
.list-item time{display:block;margin-top:8px;font-size:12px;color:var(--muted-2);}

/* ============ Audit ============ */
.audit{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;}
.audit-item{
  display:flex;gap:12px;align-items:flex-start;padding:20px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:rgba(255,255,255,.035);
}
.audit-check{
  flex:0 0 auto;width:22px;height:22px;border-radius:6px;display:grid;place-items:center;
  background:rgba(37,224,208,.16);border:1px solid rgba(37,224,208,.38);color:#7ff0e4;font-size:12px;font-weight:900;
}
.audit-item h4{font-size:15px;font-weight:800;margin-bottom:6px;}
.audit-item p{font-size:13.5px;color:var(--muted);line-height:1.72;}

/* ============ Topic tags ============ */
.topic-wall{display:flex;flex-wrap:wrap;gap:12px;}
.topic-pill{
  padding:10px 18px;border-radius:999px;font-size:14px;color:#c2d6f2;
  background:rgba(255,255,255,.05);border:1px solid var(--border);
  transition:all .2s ease;
}
.topic-pill:hover{background:rgba(37,224,208,.14);border-color:rgba(37,224,208,.45);color:#eafcff;transform:translateY(-2px);}

/* ============ FAQ ============ */
.faq{display:grid;gap:14px;max-width:900px;margin:0 auto;}
.faq-item{
  border-radius:var(--radius);border:1px solid var(--border);
  background:rgba(255,255,255,.04);overflow:hidden;transition:border-color .2s ease,background .2s ease;
}
.faq-item[open]{border-color:rgba(37,224,208,.42);background:rgba(37,224,208,.06);}
.faq-item summary{
  list-style:none;cursor:pointer;padding:18px 22px;font-size:15.5px;font-weight:700;
  display:flex;align-items:center;justify-content:space-between;gap:14px;color:#e8f1ff;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";font-size:20px;font-weight:400;color:#7ff0e4;line-height:1;transition:transform .25s ease;
}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-body{padding:0 22px 20px;font-size:14.5px;color:var(--muted);line-height:1.85;}

/* ============ CTA band ============ */
.cta-band{
  position:relative;overflow:hidden;border-radius:var(--radius-lg);
  padding:52px 44px;border:1px solid rgba(37,224,208,.32);
  background:linear-gradient(130deg,rgba(31,99,214,.30),rgba(37,224,208,.16));
  box-shadow:0 26px 60px rgba(2,8,22,.7);text-align:center;
}
.cta-band::before{
  content:"";position:absolute;inset:0;background-image:url('/assets/images/f0f6370d25955fb2.webp');
  background-size:cover;background-position:center;opacity:.16;
}
.cta-inner{position:relative;z-index:2;}
.cta-band h2{font-size:28px;font-weight:900;margin-bottom:14px;}
.cta-band p{font-size:15px;color:#c6d8f2;line-height:1.85;max-width:720px;margin:0 auto 26px;}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}

/* ============ Footer ============ */
.site-footer{
  border-top:1px solid rgba(122,168,255,.16);
  background:linear-gradient(180deg,rgba(4,9,20,.6),rgba(3,7,16,.96));
  padding:56px 0 26px;margin-top:0;
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:34px;border-bottom:1px solid rgba(122,168,255,.12);}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;margin-bottom:14px;}
.footer-about{font-size:14px;color:var(--muted);line-height:1.85;max-width:400px;}
.footer-col h4{font-size:15px;font-weight:800;margin-bottom:14px;color:#dcebff;}
.footer-col li{margin-bottom:9px;}
.footer-col a{font-size:14px;color:var(--muted);}
.footer-col a:hover{color:#7ff0e4;}
.footer-bottom{padding-top:22px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--muted-2);}
.footer-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px;}
.footer-tags span{font-size:12px;padding:4px 10px;border-radius:6px;background:rgba(255,255,255,.05);border:1px solid rgba(122,168,255,.14);color:#8fa6c6;}

/* ============ Responsive ============ */
@media (max-width:1024px){
  .hero h1{font-size:34px;}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr));}
  .metrics{grid-template-columns:repeat(2,minmax(0,1fr));}
  .demo-grid{grid-template-columns:1fr;}
  .plan-grid{grid-template-columns:1fr;}
  .audit{grid-template-columns:repeat(2,minmax(0,1fr));}
  .post-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
}
@media (max-width:860px){
  .nav{
    position:absolute;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:4px;
    padding:14px 20px 20px;margin-left:0;
    background:rgba(6,12,26,.98);
    border-bottom:1px solid rgba(122,182,255,.24);
    box-shadow:0 22px 44px rgba(2,8,22,.7);
    display:none;
  }
  .nav.is-open{display:flex;}
  .nav-link{padding:12px 14px;font-size:15.5px;}
  .nav-cta{margin:10px 0 0;justify-content:center;display:flex;}
  .nav-toggle{display:flex;margin-left:auto;}
  .compare{grid-template-columns:1fr;}
  .section{padding:58px 0;}
  .section-title{font-size:24px;}
  .hero{padding:52px 0 48px;}
  .hero h1{font-size:29px;}
  .cta-band{padding:40px 24px;}
  .cta-band h2{font-size:23px;}
}
@media (max-width:520px){
  .container{padding:0 18px;}
  .brand{font-size:15px;}
  .brand-mark{width:28px;height:28px;font-size:13px;}
  .grid-2,.grid-3,.grid-4,.steps,.metrics,.audit,.post-grid,.list-row{grid-template-columns:1fr;}
  .hero h1{font-size:25px;line-height:1.35;}
  .hero-lead{font-size:14.5px;}
  .btn{width:100%;}
  .hero-actions .btn{width:100%;}
  .card,.compare-col,.plan,.channel-card{padding:22px;}
  .metric-num{font-size:28px;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;}
  .faq-item summary{font-size:14.5px;padding:16px 18px;}
  .faq-body{padding:0 18px 18px;}
}

/* roulang page: category1 */
:root{
 --bg:#050a16;
 --bg-soft:#0a1226;
 --bg-deep:#030711;
 --panel:rgba(255,255,255,.045);
 --panel-2:rgba(255,255,255,.075);
 --border:rgba(122,168,255,.16);
 --border-strong:rgba(122,182,255,.42);
 --text:#e9f1ff;
 --muted:#9db0cf;
 --muted-2:#7386a6;
 --brand:#3d8bff;
 --brand-deep:#1f63d6;
 --accent:#25e0d0;
 --warn:#ffcc66;
 --glow:0 0 0 1px rgba(61,139,255,.35), 0 14px 34px rgba(31,99,214,.42);
 --radius:14px;
 --radius-sm:10px;
 --radius-lg:22px;
 --shadow:0 18px 44px rgba(2,8,22,.62);
 --container:1180px;
 --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
 margin:0;font-family:var(--font);font-size:16px;line-height:1.75;color:var(--text);
 background:
 radial-gradient(1100px 620px at 12% -8%, rgba(61,139,255,.20), transparent 62%),
 radial-gradient(900px 520px at 92% 4%, rgba(37,224,208,.13), transparent 60%),
 linear-gradient(180deg,#050a16 0%,#060d1e 46%,#040914 100%);
 background-attachment:fixed;min-height:100vh;
}
img{max-width:100%;display:block;height:auto;border:0;}
a{color:inherit;text-decoration:none;transition:color .2s ease;}
a:hover{color:#bcd8ff;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
h1,h2,h3,h4{margin:0;line-height:1.32;font-weight:800;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
svg{display:block;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ============ Header ============ */
.site-header{
 position:sticky;top:0;z-index:80;
 background:rgba(5,10,22,.72);
 backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
 border-bottom:1px solid rgba(122,168,255,.12);
 transition:box-shadow .25s ease,background .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{background:rgba(5,10,22,.92);box-shadow:0 12px 30px rgba(2,8,22,.55);border-bottom-color:rgba(122,182,255,.26);}
.header-inner{display:flex;align-items:center;gap:26px;height:64px;position:relative;}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:.4px;white-space:nowrap;}
.brand-mark{
 width:32px;height:32px;border-radius:9px;flex:0 0 auto;display:grid;place-items:center;
 background:linear-gradient(140deg,rgba(61,139,255,.95),rgba(37,224,208,.9));
 color:#04101f;font-size:15px;font-weight:900;box-shadow:0 8px 20px rgba(37,224,208,.28);
}
.brand-text{color:#f2f7ff;}
.brand-text span{color:var(--accent);}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-link{
 padding:8px 14px;border-radius:9px;font-size:15px;color:var(--muted);
 border:1px solid transparent;transition:all .2s ease;white-space:nowrap;
}
.nav-link:hover{color:#fff;background:rgba(61,139,255,.14);border-color:rgba(122,182,255,.22);}
.nav-link.active{color:#eaf3ff;background:rgba(61,139,255,.20);border-color:rgba(122,182,255,.42);box-shadow:inset 0 0 18px rgba(61,139,255,.20);}
.nav-cta{
 margin-left:14px;padding:10px 20px;border-radius:10px;font-size:15px;font-weight:700;
 background:linear-gradient(135deg,#3d8bff,#22c8dd);color:#03101f;
 box-shadow:var(--glow);transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-2px);filter:brightness(1.08);color:#03101f;box-shadow:0 0 0 1px rgba(61,139,255,.55),0 18px 38px rgba(31,99,214,.55);}
.nav-toggle{
 display:none;width:42px;height:42px;border-radius:10px;
 border:1px solid var(--border);background:rgba(255,255,255,.05);
 align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:#cfe2ff;border-radius:2px;transition:.25s;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ============ Buttons / Tags / Badges ============ */
.btn{
 display:inline-flex;align-items:center;justify-content:center;gap:8px;
 padding:13px 26px;border-radius:10px;font-size:15px;font-weight:700;min-height:44px;
 transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
}
.btn-primary{background:linear-gradient(135deg,#3d8bff,#1f63d6);color:#f2f8ff;box-shadow:var(--glow);}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 0 1px rgba(61,139,255,.6),0 20px 42px rgba(31,99,214,.6);color:#fff;}
.btn-ghost{border:1px solid var(--border-strong);color:#d8e7ff;background:rgba(255,255,255,.03);}
.btn-ghost:hover{background:rgba(61,139,255,.16);border-color:#6fb0ff;transform:translateY(-3px);color:#fff;}
.btn-sm{padding:9px 18px;font-size:14px;min-height:40px;border-radius:9px;}
.tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
 display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;
 font-size:13px;color:#b8d3f6;background:rgba(61,139,255,.12);border:1px solid rgba(122,182,255,.24);
}
.tag-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;color:#9fe9ff;background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:1.6px;color:#8fc2ff;font-weight:700;}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--accent));}

/* ============ Sections ============ */
.section{padding:78px 0;position:relative;}
.section--alt{background:linear-gradient(180deg,rgba(10,18,38,.85),rgba(5,10,22,.35));border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section--deep{background:radial-gradient(900px 400px at 50% 0%,rgba(31,99,214,.20),transparent 70%),rgba(3,7,17,.72);border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section-head{max-width:800px;margin-bottom:38px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-title{font-size:29px;margin:12px 0 12px;}
.section-title em{font-style:normal;color:var(--accent);}
.section-desc{font-size:15px;color:var(--muted);line-height:1.85;}

/* ============ Page Hero ============ */
.page-hero{position:relative;overflow:hidden;padding:74px 0 58px;border-bottom:1px solid rgba(122,168,255,.12);}
.page-hero-media{position:absolute;inset:0;z-index:0;}
.page-hero-media img{width:100%;height:100%;object-fit:cover;opacity:.26;}
.page-hero::after{
 content:"";position:absolute;inset:0;z-index:1;
 background:linear-gradient(118deg,rgba(5,10,22,.97) 0%,rgba(5,10,22,.86) 44%,rgba(5,10,22,.52) 100%),
 radial-gradient(760px 360px at 88% 12%,rgba(37,224,208,.16),transparent 68%);
}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.12fr .88fr;gap:52px;align-items:center;}
.hero-title{font-size:clamp(28px,3.4vw,42px);line-height:1.24;letter-spacing:.4px;margin:16px 0 18px;}
.hero-title em{font-style:normal;color:var(--accent);}
.hero-sub{font-size:16px;color:#c4d5ef;line-height:1.85;max-width:600px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
.hero-tags{margin-top:26px;}
.hero-ticker{
 position:relative;z-index:2;margin-top:44px;display:flex;flex-wrap:wrap;align-items:center;gap:14px;
 padding:14px 20px;border-radius:var(--radius);border:1px solid var(--border);
 background:rgba(8,16,34,.72);backdrop-filter:blur(12px);font-size:14px;color:var(--muted);
}
.hero-ticker strong{color:#dcebff;font-weight:700;}
.hero-ticker .ticker-sep{width:1px;height:16px;background:rgba(122,168,255,.28);}
.hero-panel{
 background:linear-gradient(160deg,rgba(255,255,255,.09),rgba(255,255,255,.03));
 border:1px solid var(--border-strong);border-radius:var(--radius-lg);
 padding:22px;box-shadow:var(--shadow);backdrop-filter:blur(14px);
}
.hero-panel img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius);border:1px solid rgba(122,168,255,.22);}
.hero-panel-list{margin-top:18px;display:grid;gap:10px;}
.hero-panel-list li{display:flex;align-items:center;gap:10px;font-size:14px;color:#c9dbff;}
.hero-panel-list li span{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px rgba(37,224,208,.8);flex:0 0 auto;}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px;}
.hero-stat{padding:12px 10px;border-radius:var(--radius-sm);background:rgba(61,139,255,.10);border:1px solid rgba(122,182,255,.22);text-align:center;}
.hero-stat b{display:block;font-size:19px;color:#eaf4ff;line-height:1.2;}
.hero-stat small{display:block;font-size:12px;color:var(--muted-2);margin-top:4px;}

/* ============ Cards & Grids ============ */
.grid{display:grid;gap:22px;}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr));}
.card{
 position:relative;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
 padding:24px;backdrop-filter:blur(10px);
 transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,background .2s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--border-strong);background:var(--panel-2);}
.card-icon{
 width:42px;height:42px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;
 background:linear-gradient(150deg,rgba(61,139,255,.28),rgba(37,224,208,.22));
 border:1px solid rgba(122,182,255,.32);color:#a9d6ff;
}
.card-icon svg{width:21px;height:21px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.card h3{font-size:17px;margin-bottom:10px;color:#eef5ff;}
.card p{font-size:14.5px;color:var(--muted);line-height:1.8;}
.card-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.card-tags span{font-size:12px;padding:3px 10px;border-radius:999px;color:#a9c8ee;background:rgba(61,139,255,.10);border:1px solid rgba(122,168,255,.22);}
.card-num{position:absolute;top:20px;right:22px;font-size:13px;color:rgba(157,176,207,.55);letter-spacing:1px;}

/* ============ Flow ============ */
.flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;counter-reset:flow;}
.flow-item{position:relative;padding:26px 22px 22px;border-radius:var(--radius);border:1px solid var(--border);background:rgba(255,255,255,.04);transition:transform .2s ease,border-color .2s ease,background .2s ease;}
.flow-item:hover{transform:translateY(-4px);border-color:var(--border-strong);background:rgba(61,139,255,.10);}
.flow-step{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:10px;font-size:14px;font-weight:800;color:#03101f;background:linear-gradient(135deg,#3d8bff,#22c8dd);margin-bottom:14px;}
.flow-item h3{font-size:16px;margin-bottom:8px;}
.flow-item p{font-size:14px;color:var(--muted);line-height:1.78;}

/* ============ Metrics ============ */
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;}
.metric{padding:26px 22px;border-radius:var(--radius);border:1px solid var(--border);background:linear-gradient(160deg,rgba(61,139,255,.14),rgba(255,255,255,.03));text-align:center;}
.metric b{display:block;font-size:30px;line-height:1.2;color:#eaf4ff;letter-spacing:.5px;}
.metric b i{font-style:normal;font-size:15px;color:var(--accent);margin-left:2px;}
.metric span{display:block;margin-top:8px;font-size:13.5px;color:var(--muted);}

/* ============ Split (demo) ============ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center;}
.split-media{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-strong);box-shadow:var(--shadow);}
.split-media img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.split-body .checklist{margin-top:22px;display:grid;gap:14px;}
.checklist li{display:flex;gap:12px;font-size:15px;color:#c7d8f2;line-height:1.78;}
.checklist li .ck{flex:0 0 auto;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;background:rgba(37,224,208,.16);border:1px solid rgba(37,224,208,.36);color:var(--accent);font-size:12px;font-weight:800;margin-top:3px;}
.checklist li strong{color:#eaf4ff;}

/* ============ Channel Matrix ============ */
.channel-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.channel{
 display:block;padding:24px;border-radius:var(--radius);border:1px solid var(--border);
 background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
 transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.channel:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:var(--shadow);background:rgba(61,139,255,.12);color:inherit;}
.channel h3{font-size:17px;margin-bottom:8px;color:#eef5ff;}
.channel p{font-size:14px;color:var(--muted);line-height:1.78;}
.channel .channel-more{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-size:13.5px;color:#8fc2ff;font-weight:700;}
.channel:hover .channel-more{color:var(--accent);}

/* ============ CMS list ============ */
.cms-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.cms-card{
 display:flex;flex-direction:column;gap:10px;padding:22px;border-radius:var(--radius);
 border:1px solid var(--border);background:rgba(255,255,255,.04);
 transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.cms-card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:var(--shadow);background:var(--panel-2);}
.cms-card h3{font-size:16px;line-height:1.55;}
.cms-card h3 a{color:#eaf3ff;}
.cms-card h3 a:hover{color:var(--accent);}
.cms-card p{font-size:14px;color:var(--muted);line-height:1.78;}
.cms-meta{display:flex;flex-wrap:wrap;gap:10px;font-size:12.5px;color:var(--muted-2);margin-top:auto;padding-top:10px;border-top:1px dashed rgba(122,168,255,.16);}
.cms-meta span:first-child{color:#8fc2ff;}
.cms-empty{padding:32px;border-radius:var(--radius);border:1px dashed rgba(122,168,255,.28);background:rgba(255,255,255,.03);color:var(--muted);font-size:14.5px;text-align:center;}

/* ============ FAQ ============ */
.faq{display:grid;gap:14px;max-width:900px;}
.faq details{border:1px solid var(--border);border-radius:var(--radius);background:rgba(255,255,255,.04);padding:0 22px;transition:border-color .2s ease,background .2s ease;}
.faq details:hover{border-color:var(--border-strong);background:rgba(61,139,255,.08);}
.faq details[open]{border-color:var(--border-strong);background:rgba(61,139,255,.10);}
.faq summary{
 list-style:none;cursor:pointer;padding:18px 34px 18px 0;font-size:16px;font-weight:700;color:#e8f2ff;position:relative;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{
 content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);
 width:24px;height:24px;border-radius:7px;display:grid;place-items:center;
 font-size:16px;font-weight:700;color:var(--accent);background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);
}
.faq details[open] summary::after{content:"−";}
.faq .faq-a{padding:0 0 20px;font-size:14.5px;color:var(--muted);line-height:1.85;}

/* ============ CTA ============ */
.cta-band{
 position:relative;overflow:hidden;border-radius:var(--radius-lg);
 border:1px solid var(--border-strong);
 background:linear-gradient(130deg,rgba(31,99,214,.42),rgba(37,224,208,.16));
 padding:44px 40px;display:grid;grid-template-columns:1.25fr .75fr;gap:34px;align-items:center;
 box-shadow:var(--shadow);
}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 260px at 88% 0%,rgba(37,224,208,.22),transparent 70%);pointer-events:none;}
.cta-band h2{position:relative;font-size:26px;margin-bottom:12px;}
.cta-band p{position:relative;font-size:15px;color:#d3e3fa;line-height:1.85;max-width:640px;}
.cta-actions{position:relative;display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end;}

/* ============ Footer ============ */
.site-footer{border-top:1px solid rgba(122,168,255,.16);background:linear-gradient(180deg,rgba(4,10,22,.86),rgba(3,7,17,.98));padding:58px 0 26px;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr;gap:44px;padding-bottom:34px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;margin-bottom:14px;}
.footer-about{font-size:14px;color:var(--muted);line-height:1.85;max-width:460px;}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.footer-tags span{font-size:12px;padding:4px 11px;border-radius:999px;color:#a9c8ee;background:rgba(61,139,255,.10);border:1px solid rgba(122,168,255,.22);}
.footer-col h4{font-size:15px;color:#e8f2ff;margin-bottom:14px;}
.footer-col ul{display:grid;gap:10px;}
.footer-col a{font-size:14px;color:var(--muted);}
.footer-col a:hover{color:var(--accent);}
.footer-bottom{
 display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
 padding-top:20px;border-top:1px solid rgba(122,168,255,.14);
 font-size:13px;color:var(--muted-2);
}

/* ============ Responsive ============ */
@media (max-width:1080px){
 .hero-inner{grid-template-columns:1fr;gap:36px;}
 .hero-panel{max-width:560px;}
 .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:960px){
 .nav-toggle{display:flex;order:3;margin-left:10px;}
 .nav-cta{order:2;margin-left:auto;padding:9px 16px;font-size:14px;}
 .brand{order:1;}
 .nav{
  position:absolute;top:64px;left:0;right:0;margin:0;
  flex-direction:column;align-items:stretch;gap:4px;
  padding:14px 20px 18px;display:none;
  background:rgba(5,10,22,.97);border-bottom:1px solid var(--border);
  backdrop-filter:blur(16px);
 }
 .nav.is-open{display:flex;}
 .nav-link{padding:12px 14px;font-size:15px;}
 .grid-3,.grid-4,.channel-grid,.cms-grid,.flow,.metrics{grid-template-columns:repeat(2,minmax(0,1fr));}
 .split{grid-template-columns:1fr;gap:30px;}
 .cta-band{grid-template-columns:1fr;padding:34px 26px;}
 .cta-actions{justify-content:flex-start;}
}
@media (max-width:768px){
 .section{padding:56px 0;}
 .page-hero{padding:54px 0 44px;}
 .section-title{font-size:24px;}
 .hero-title{font-size:28px;}
 .grid-2,.grid-3,.grid-4,.channel-grid,.cms-grid,.flow,.metrics{grid-template-columns:1fr;}
 .hero-stats{grid-template-columns:repeat(3,1fr);}
 .hero-ticker{padding:12px 16px;font-size:13px;gap:10px;}
 .hero-ticker .ticker-sep{display:none;}
 .footer-grid{grid-template-columns:1fr;gap:28px;}
 .metric b{font-size:26px;}
}
@media (max-width:520px){
 .container{padding:0 18px;}
 .header-inner{gap:12px;}
 .brand-text{font-size:15px;}
 .nav-cta{padding:8px 12px;font-size:13px;}
 .hero-stats{grid-template-columns:1fr;}
 .hero-actions .btn{width:100%;}
 .card,.cms-card,.channel{padding:20px;}
 .cta-band h2{font-size:21px;}
 .footer-bottom{flex-direction:column;align-items:flex-start;}
}

/* roulang page: article */
:root{
 --bg:#050a16;
 --bg-soft:#0a1226;
 --bg-deep:#030711;
 --panel:rgba(255,255,255,.045);
 --panel-2:rgba(255,255,255,.075);
 --border:rgba(122,168,255,.16);
 --border-strong:rgba(122,182,255,.42);
 --text:#e9f1ff;
 --muted:#9db0cf;
 --muted-2:#7386a6;
 --brand:#3d8bff;
 --brand-deep:#1f63d6;
 --accent:#25e0d0;
 --warn:#ffcc66;
 --glow:0 0 0 1px rgba(61,139,255,.35), 0 14px 34px rgba(31,99,214,.42);
 --radius:14px;
 --radius-sm:10px;
 --radius-lg:22px;
 --shadow:0 18px 44px rgba(2,8,22,.62);
 --container:1180px;
 --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
 margin:0;
 font-family:var(--font);
 font-size:16px;
 line-height:1.75;
 color:var(--text);
 background:
 radial-gradient(1100px 620px at 12% -8%, rgba(61,139,255,.20), transparent 62%),
 radial-gradient(900px 520px at 92% 4%, rgba(37,224,208,.13), transparent 60%),
 linear-gradient(180deg,#050a16 0%,#060d1e 46%,#040914 100%);
 background-attachment:fixed;
 min-height:100vh;
}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color .2s ease;}
a:hover{color:#bcd8ff;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}
/* ============ Header ============ */
.site-header{
 position:sticky;top:0;z-index:80;
 background:rgba(5,10,22,.72);
 backdrop-filter:blur(16px);
 -webkit-backdrop-filter:blur(16px);
 border-bottom:1px solid rgba(122,168,255,.12);
 transition:box-shadow .25s ease,background .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
 background:rgba(5,10,22,.92);
 box-shadow:0 12px 30px rgba(2,8,22,.55);
 border-bottom-color:rgba(122,182,255,.26);
}
.header-inner{display:flex;align-items:center;gap:26px;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:.4px;white-space:nowrap;flex:0 0 auto;}
.brand-mark{
 width:32px;height:32px;border-radius:9px;flex:0 0 auto;
 display:grid;place-items:center;
 background:linear-gradient(140deg,rgba(61,139,255,.95),rgba(37,224,208,.9));
 color:#04101f;font-size:15px;font-weight:900;
 box-shadow:0 8px 20px rgba(37,224,208,.28);
}
.brand-text{color:#f2f7ff;}
.brand-text span{color:var(--accent);}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-link{
 padding:8px 14px;border-radius:9px;font-size:15px;color:var(--muted);
 border:1px solid transparent;transition:all .2s ease;white-space:nowrap;
}
.nav-link:hover{color:#fff;background:rgba(61,139,255,.14);border-color:rgba(122,182,255,.22);}
.nav-link.active{
 color:#eaf3ff;background:rgba(61,139,255,.20);
 border-color:rgba(122,182,255,.42);
 box-shadow:inset 0 0 18px rgba(61,139,255,.20);
}
.nav-cta{
 margin-left:14px;padding:10px 20px;border-radius:10px;font-size:15px;font-weight:700;
 background:linear-gradient(135deg,#3d8bff,#22c8dd);color:#03101f;
 box-shadow:var(--glow);transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;
 white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-2px);filter:brightness(1.08);color:#03101f;box-shadow:0 0 0 1px rgba(61,139,255,.55),0 18px 38px rgba(31,99,214,.55);}
.nav-toggle{
 display:none;width:42px;height:42px;border-radius:10px;
 border:1px solid var(--border);background:rgba(255,255,255,.05);
 align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:#cfe2ff;border-radius:2px;transition:.25s;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
/* ============ Buttons / Tags ============ */
.btn{
 display:inline-flex;align-items:center;justify-content:center;gap:8px;
 padding:13px 26px;border-radius:10px;font-size:15px;font-weight:700;
 transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;
 min-height:44px;
}
.btn-primary{background:linear-gradient(135deg,#3d8bff,#1f63d6);color:#f2f8ff;box-shadow:var(--glow);}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 0 1px rgba(61,139,255,.6),0 20px 42px rgba(31,99,214,.6);color:#fff;}
.btn-ghost{border:1px solid var(--border-strong);color:#d8e7ff;background:rgba(255,255,255,.03);}
.btn-ghost:hover{background:rgba(61,139,255,.16);border-color:#6fb0ff;transform:translateY(-3px);color:#fff;}
.btn-sm{padding:9px 18px;font-size:14px;min-height:40px;border-radius:9px;}
.tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
 display:inline-flex;align-items:center;gap:6px;
 padding:6px 14px;border-radius:999px;font-size:13px;color:#b8d3f6;
 background:rgba(61,139,255,.12);border:1px solid rgba(122,182,255,.24);
}
.tag-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);}
.badge{
 display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;
 color:#9fe9ff;background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);
}
.eyebrow{
 display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:1.6px;
 color:#8fc2ff;text-transform:uppercase;font-weight:700;
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--accent));}
/* ============ Sections ============ */
.section{padding:72px 0;position:relative;}
.section--alt{background:linear-gradient(180deg,rgba(10,18,38,.85),rgba(5,10,22,.35));border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section--deep{background:radial-gradient(900px 400px at 50% 0%,rgba(31,99,214,.20),transparent 70%),rgba(3,7,17,.72);border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section-head{max-width:780px;margin-bottom:32px;}
.section-title{font-size:27px;line-height:1.4;font-weight:800;letter-spacing:.3px;margin:12px 0 10px;}
.section-title em{font-style:normal;color:var(--accent);}
.section-desc{font-size:15px;color:var(--muted);line-height:1.85;margin:0;}
/* ============ Article hero ============ */
.article-hero{
 position:relative;overflow:hidden;
 border-bottom:1px solid rgba(122,168,255,.16);
 background:linear-gradient(180deg,rgba(9,18,36,.94),rgba(4,9,20,.98));
}
.article-hero .hero-bg{
 position:absolute;inset:0;
 background:url(/assets/images/f0f6370d25955fb2.webp) center/cover no-repeat;
 opacity:.20;
}
.article-hero .hero-veil{
 position:absolute;inset:0;
 background:radial-gradient(760px 320px at 18% 0%,rgba(61,139,255,.35),transparent 66%),
 linear-gradient(180deg,rgba(5,10,22,.35),rgba(5,10,22,.92));
}
.article-hero .container{position:relative;z-index:2;padding-top:26px;padding-bottom:34px;}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted-2);}
.crumbs a{color:#a9c6ee;}
.crumbs a:hover{color:#fff;}
.crumbs .sep{color:rgba(157,176,207,.5);}
.article-title{
 font-size:clamp(24px,3.2vw,36px);line-height:1.34;font-weight:800;
 letter-spacing:.3px;margin:14px 0 12px;max-width:920px;color:#f4f9ff;
}
.article-lead{max-width:820px;font-size:15px;line-height:1.85;color:#b9cbe6;margin:0 0 18px;}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;font-size:13.5px;color:var(--muted);}
.article-meta .meta-item{display:inline-flex;align-items:center;gap:7px;}
.article-meta .meta-item::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);opacity:.85;}
.article-meta .chip{
 padding:4px 12px;border-radius:999px;font-size:12.5px;color:#9fe9ff;
 background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);
}
/* ============ Article layout ============ */
.article-wrap{padding:52px 0 8px;}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;align-items:start;}
.article-body{
 background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);
 padding:30px 32px 34px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
 box-shadow:var(--shadow);font-size:16px;line-height:1.85;color:#dbe7f8;
}
.article-body h2{
 font-size:21px;line-height:1.45;margin:30px 0 12px;padding-left:12px;
 border-left:3px solid var(--accent);color:#f2f8ff;
}
.article-body h2:first-child{margin-top:0;}
.article-body h3{font-size:18px;line-height:1.5;margin:24px 0 10px;color:#eaf3ff;}
.article-body p{margin:0 0 16px;color:#cfdcef;}
.article-body ul,.article-body ol{margin:0 0 18px;padding-left:22px;color:#cfdcef;}
.article-body li{margin-bottom:8px;}
.article-body strong{color:#ffffff;}
.article-body a{color:#8fc2ff;border-bottom:1px dotted rgba(143,194,255,.5);}
.article-body a:hover{color:#fff;}
.article-body img{border-radius:var(--radius);margin:18px 0;border:1px solid var(--border);}
.article-body blockquote{
 margin:20px 0;padding:14px 18px;border-left:3px solid var(--brand);
 background:rgba(61,139,255,.09);color:#c8daf3;
 border-radius:0 var(--radius-sm) var(--radius-sm) 0;
}
.article-body table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;}
.article-body th,.article-body td{border:1px solid rgba(122,168,255,.18);padding:10px 12px;text-align:left;}
.article-body th{background:rgba(61,139,255,.12);color:#eaf3ff;font-weight:700;}
.article-body code{background:rgba(255,255,255,.08);padding:2px 6px;border-radius:5px;font-size:14px;color:#b8f0ea;}
.article-empty{
 background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);
 padding:52px 30px;text-align:center;box-shadow:var(--shadow);
}
.article-empty h2{font-size:22px;margin:0 0 10px;color:#f2f8ff;}
.article-empty p{margin:0 0 22px;color:var(--muted);font-size:15px;}
.side-stack{display:grid;gap:16px;position:sticky;top:88px;}
.side-card{
 background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
 padding:20px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
 transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.side-card:hover{transform:translateY(-3px);border-color:rgba(122,182,255,.34);box-shadow:0 16px 34px rgba(2,8,22,.5);}
.side-card h3{font-size:15px;margin:0 0 12px;color:#eaf3ff;letter-spacing:.3px;}
.side-list{list-style:none;margin:0;padding:0;display:grid;gap:10px;}
.side-list li{display:flex;gap:9px;font-size:13.8px;line-height:1.7;color:var(--muted);}
.side-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);margin-top:9px;flex:0 0 auto;}
.side-list a{color:#a9c6ee;}
.side-list a:hover{color:#fff;}
.side-note{font-size:13.5px;line-height:1.8;color:var(--muted-2);margin:0;}
/* ============ Algorithm cards ============ */
.algo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.algo-card{
 position:relative;background:var(--panel);border:1px solid var(--border);
 border-radius:var(--radius);padding:22px 20px;
 backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
 transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.algo-card:hover{transform:translateY(-4px);box-shadow:0 20px 40px rgba(2,8,22,.6);border-color:rgba(122,182,255,.4);}
.algo-ico{
 width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
 background:rgba(61,139,255,.14);border:1px solid rgba(122,182,255,.26);
 color:#8fc2ff;margin-bottom:14px;
}
.algo-ico svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.algo-card h3{font-size:16px;margin:0 0 8px;color:#eef5ff;}
.algo-card p{font-size:14px;line-height:1.78;color:var(--muted);margin:0 0 12px;}
.algo-card .badge{font-size:11.5px;}
/* ============ Demo ============ */
.demo-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch;}
.demo-panel{
 background:rgba(255,255,255,.04);border:1px solid var(--border);
 border-radius:var(--radius-lg);padding:26px;
 backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
}
.demo-panel h3{font-size:17px;margin:0 0 6px;color:#f2f8ff;}
.demo-panel .sub{font-size:13.5px;color:var(--muted-2);margin:0 0 18px;}
.hand{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;}
.tile{
 display:inline-flex;align-items:center;justify-content:center;
 min-width:40px;height:48px;padding:0 6px;border-radius:8px;
 background:linear-gradient(160deg,#f4f8ff,#ccdaef);color:#0b1a30;
 font-size:12.5px;font-weight:800;letter-spacing:.5px;
 box-shadow:0 6px 14px rgba(2,8,22,.45);
}
.tile--out{background:linear-gradient(160deg,rgba(255,255,255,.16),rgba(255,255,255,.06));color:#9db0cf;box-shadow:none;border:1px dashed rgba(157,176,207,.4);}
.demo-line{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted);margin-bottom:10px;}
.demo-line b{color:#eaf3ff;font-weight:700;}
.meter{height:8px;border-radius:999px;background:rgba(255,255,255,.08);overflow:hidden;margin:6px 0 16px;}
.meter i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--accent));}
.stat-row{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:6px;}
.stat{
 background:rgba(61,139,255,.08);border:1px solid rgba(122,182,255,.22);
 border-radius:var(--radius-sm);padding:14px;
}
.stat b{display:block;font-size:22px;line-height:1.2;color:#9fe9ff;letter-spacing:.5px;}
.stat span{font-size:12.5px;color:var(--muted-2);}
/* ============ Fold ============ */
.fold-list{display:grid;gap:12px;max-width:900px;}
details.rule-fold{
 border:1px solid var(--border);border-radius:var(--radius);
 background:rgba(255,255,255,.04);padding:0 20px;
 transition:border-color .2s ease,background .2s ease;
}
details.rule-fold:hover{border-color:rgba(122,182,255,.32);}
details.rule-fold summary{
 cursor:pointer;list-style:none;padding:17px 0;font-size:15.5px;font-weight:700;color:#eaf3ff;
 display:flex;align-items:center;justify-content:space-between;gap:14px;
}
details.rule-fold summary::-webkit-details-marker{display:none;}
details.rule-fold summary::after{content:"+";color:var(--accent);font-size:20px;line-height:1;font-weight:700;}
details.rule-fold[open] summary::after{content:"−";}
.fold-body{padding:0 0 18px;font-size:14.5px;line-height:1.85;color:var(--muted);border-top:1px solid rgba(122,168,255,.12);padding-top:14px;}
.fold-body strong{color:#cfe4ff;}
/* ============ Steps ============ */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.step{
 position:relative;padding:24px 22px;border-radius:var(--radius);
 background:var(--panel);border:1px solid var(--border);
 transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.step:hover{transform:translateY(-3px);border-color:rgba(122,182,255,.36);box-shadow:0 18px 38px rgba(2,8,22,.55);}
.step-num{font-size:12.5px;font-weight:800;letter-spacing:2px;color:var(--accent);margin-bottom:10px;}
.step h3{font-size:16px;margin:0 0 8px;color:#eef5ff;}
.step p{font-size:14px;line-height:1.78;color:var(--muted);margin:0;}
/* ============ FAQ ============ */
.faq-list{display:grid;gap:12px;max-width:900px;}
/* ============ CTA band ============ */
.cta-band{padding:0 0 76px;}
.cta-inner{
 position:relative;overflow:hidden;border-radius:var(--radius-lg);
 border:1px solid rgba(122,182,255,.3);
 padding:38px 40px;
 background:linear-gradient(120deg,rgba(31,99,214,.34),rgba(10,18,38,.9) 58%,rgba(37,224,208,.18));
 box-shadow:var(--shadow);
 display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
}
.cta-inner::after{
 content:"";position:absolute;right:-70px;top:-70px;width:230px;height:230px;border-radius:50%;
 background:radial-gradient(circle,rgba(37,224,208,.32),transparent 68%);
}
.cta-text{position:relative;z-index:2;max-width:640px;}
.cta-text h2{font-size:24px;margin:0 0 10px;color:#f6faff;line-height:1.4;}
.cta-text p{font-size:14.5px;color:#c2d5ef;margin:0;line-height:1.8;}
.cta-actions{position:relative;z-index:2;display:flex;gap:12px;flex-wrap:wrap;}
/* ============ Footer ============ */
.site-footer{
 border-top:1px solid rgba(122,168,255,.16);
 background:rgba(3,7,17,.78);
 padding:54px 0 0;
 backdrop-filter:blur(10px);
}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr;gap:38px;padding-bottom:34px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:800;margin-bottom:14px;}
.footer-about{font-size:14px;line-height:1.85;color:var(--muted);margin:0 0 16px;max-width:430px;}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;}
.footer-tags span{
 padding:4px 12px;border-radius:999px;font-size:12px;color:#a9c6ee;
 background:rgba(61,139,255,.12);border:1px solid rgba(122,182,255,.2);
}
.footer-col h4{font-size:14px;margin:0 0 14px;color:#dbe9ff;letter-spacing:.5px;}
.footer-col ul{list-style:none;margin:0;padding:0;display:grid;gap:10px;}
.footer-col a{font-size:14px;color:var(--muted);}
.footer-col a:hover{color:#cfe4ff;}
.footer-bottom{
 display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;
 border-top:1px solid rgba(122,168,255,.12);padding:18px 0 24px;
 font-size:13px;color:var(--muted-2);
}
/* ============ Responsive ============ */
@media (max-width:1024px){
 .article-layout{grid-template-columns:1fr;}
 .side-stack{position:static;grid-template-columns:repeat(2,1fr);}
 .algo-grid{grid-template-columns:repeat(2,1fr);}
 .demo-grid{grid-template-columns:1fr;}
 .steps{grid-template-columns:1fr;}
 .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
}
@media (max-width:900px){
 .header-inner{gap:12px;}
 .nav{
  position:absolute;top:64px;left:0;right:0;
  flex-direction:column;align-items:stretch;gap:4px;
  padding:14px 20px 18px;
  background:rgba(6,12,26,.98);
  border-bottom:1px solid rgba(122,168,255,.18);
  box-shadow:0 24px 40px rgba(2,8,22,.6);
  display:none;
 }
 .nav.is-open{display:flex;}
 .nav-link{width:100%;padding:12px 14px;font-size:15px;}
 .nav-toggle{display:flex;margin-left:auto;}
 .nav-cta{margin-left:0;}
 .container{padding:0 18px;}
}
@media (max-width:768px){
 .section{padding:52px 0;}
 .article-wrap{padding:36px 0 4px;}
 .article-body{padding:22px 20px 26px;font-size:15.5px;}
 .section-title{font-size:23px;}
 .cta-inner{padding:28px 24px;}
 .cta-text h2{font-size:21px;}
 .cta-actions{width:100%;}
 .cta-actions .btn{flex:1 1 160px;}
 .side-stack{grid-template-columns:1fr;}
 .algo-grid{grid-template-columns:1fr;}
 .article-hero .container{padding-top:20px;padding-bottom:26px;}
 .footer-grid{grid-template-columns:1fr;gap:26px;}
 .stat-row{grid-template-columns:1fr;}
}
@media (max-width:520px){
 .brand-text{font-size:15px;}
 .brand-mark{width:29px;height:29px;font-size:14px;border-radius:8px;}
 .nav-cta{padding:8px 13px;font-size:13px;border-radius:9px;}
 .article-meta{font-size:12.5px;gap:8px 12px;}
 .btn{width:100%;}
 .cta-actions .btn{width:100%;flex:1 1 100%;}
 .tile{min-width:34px;height:42px;font-size:11.5px;}
 .footer-bottom{font-size:12.5px;}
}

/* roulang page: category2 */
:root{
  --bg:#050a16;
  --bg-soft:#0a1226;
  --bg-deep:#030711;
  --panel:rgba(255,255,255,.045);
  --panel-2:rgba(255,255,255,.075);
  --border:rgba(122,168,255,.16);
  --border-strong:rgba(122,182,255,.42);
  --text:#e9f1ff;
  --muted:#9db0cf;
  --muted-2:#7386a6;
  --brand:#3d8bff;
  --brand-deep:#1f63d6;
  --accent:#25e0d0;
  --warn:#ffcc66;
  --glow:0 0 0 1px rgba(61,139,255,.35), 0 14px 34px rgba(31,99,214,.42);
  --radius:14px;
  --radius-sm:10px;
  --radius-lg:22px;
  --shadow:0 18px 44px rgba(2,8,22,.62);
  --container:1180px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.78;
  color:var(--text);
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(61,139,255,.20), transparent 62%),
    radial-gradient(900px 520px at 92% 4%, rgba(37,224,208,.13), transparent 60%),
    linear-gradient(180deg,#050a16 0%,#060d1e 46%,#040914 100%);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color .2s ease;}
a:hover{color:#bcd8ff;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
h1,h2,h3,h4,p,ul,ol{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(5,10,22,.72);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(122,168,255,.12);
  transition:box-shadow .25s ease,background .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
  background:rgba(5,10,22,.94);
  box-shadow:0 12px 30px rgba(2,8,22,.55);
  border-bottom-color:rgba(122,182,255,.26);
}
.header-inner{display:flex;align-items:center;gap:26px;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:.4px;white-space:nowrap;}
.brand-mark{
  width:32px;height:32px;border-radius:9px;flex:0 0 auto;
  display:grid;place-items:center;
  background:linear-gradient(140deg,rgba(61,139,255,.95),rgba(37,224,208,.9));
  color:#04101f;font-size:15px;font-weight:900;
  box-shadow:0 8px 20px rgba(37,224,208,.28);
}
.brand-text{color:#f2f7ff;}
.brand-text span{color:var(--accent);}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-link{
  padding:8px 14px;border-radius:9px;font-size:15px;color:var(--muted);
  border:1px solid transparent;transition:all .2s ease;white-space:nowrap;
}
.nav-link:hover{color:#fff;background:rgba(61,139,255,.14);border-color:rgba(122,182,255,.22);}
.nav-link.active{
  color:#eaf3ff;background:rgba(61,139,255,.20);
  border-color:rgba(122,182,255,.42);
  box-shadow:inset 0 0 18px rgba(61,139,255,.20);
}
.nav-cta{
  margin-left:14px;padding:10px 20px;border-radius:10px;font-size:15px;font-weight:700;
  background:linear-gradient(135deg,#3d8bff,#22c8dd);color:#03101f;
  box-shadow:var(--glow);transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;
  white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-2px);filter:brightness(1.08);color:#03101f;box-shadow:0 0 0 1px rgba(61,139,255,.55),0 18px 38px rgba(31,99,214,.55);}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;
  border:1px solid var(--border);background:rgba(255,255,255,.05);
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:#cfe2ff;border-radius:2px;transition:.25s;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ============ Buttons / Tags ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:10px;font-size:15px;font-weight:700;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;
  min-height:44px;text-align:center;
}
.btn-primary{background:linear-gradient(135deg,#3d8bff,#1f63d6);color:#f2f8ff;box-shadow:var(--glow);}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 0 1px rgba(61,139,255,.6),0 20px 42px rgba(31,99,214,.6);color:#fff;}
.btn-ghost{border:1px solid var(--border-strong);color:#d8e7ff;background:rgba(255,255,255,.03);}
.btn-ghost:hover{background:rgba(61,139,255,.16);border-color:#6fb0ff;transform:translateY(-3px);color:#fff;}
.btn-sm{padding:9px 18px;font-size:14px;min-height:40px;border-radius:9px;}
.tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 14px;border-radius:999px;font-size:13px;color:#b8d3f6;
  background:rgba(61,139,255,.12);border:1px solid rgba(122,182,255,.24);
}
.tag-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);}
.badge{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;
  color:#9fe9ff;background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:1.6px;
  color:#8fc2ff;text-transform:uppercase;font-weight:700;
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--accent));}

/* ============ Sections ============ */
.section{padding:78px 0;position:relative;}
.section--alt{background:linear-gradient(180deg,rgba(10,18,38,.85),rgba(5,10,22,.35));border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section--deep{background:radial-gradient(900px 400px at 50% 0%,rgba(31,99,214,.20),transparent 70%),rgba(3,7,17,.72);border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section-head{max-width:800px;margin-bottom:36px;}
.section-title{font-size:29px;line-height:1.35;font-weight:800;letter-spacing:.3px;margin:12px 0 12px;}
.section-title em{font-style:normal;color:var(--accent);}
.section-desc{font-size:15px;color:var(--muted);line-height:1.85;}

/* ============ Hero ============ */
.hero{position:relative;padding:64px 0 70px;overflow:hidden;}
.hero::before{
  content:"";position:absolute;inset:0;z-index:0;
  background:url('/assets/images/f0f6370d25955fb2.webp') center/cover no-repeat;
  opacity:.16;filter:saturate(.85);
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:0;
  background:linear-gradient(120deg,rgba(5,10,22,.96) 0%,rgba(5,10,22,.84) 46%,rgba(5,10,22,.94) 100%);
}
.hero .container{position:relative;z-index:1;}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:46px;align-items:start;}
.hero h1{font-size:clamp(28px,3.5vw,42px);line-height:1.28;font-weight:800;letter-spacing:.4px;margin:16px 0 16px;}
.hero h1 em{font-style:normal;color:var(--accent);}
.hero-sub{font-size:16px;color:var(--muted);line-height:1.85;max-width:560px;}
.hero-tags{margin:22px 0 28px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
.hero-note{margin-top:22px;font-size:13.5px;color:var(--muted-2);display:flex;align-items:center;gap:8px;}
.hero-note::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent);}

/* 对比选型卡组 */
.compare-stack{display:grid;gap:14px;}
.plan-card{
  position:relative;
  border:1px solid var(--border);border-radius:var(--radius);
  background:var(--panel);
  padding:18px 20px;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,background .2s ease;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.plan-card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 16px 38px rgba(2,8,22,.55);background:var(--panel-2);}
.plan-card.featured{
  border-color:rgba(37,224,208,.5);
  background:linear-gradient(150deg,rgba(61,139,255,.20),rgba(37,224,208,.10) 60%,rgba(255,255,255,.04));
  box-shadow:0 0 0 1px rgba(37,224,208,.28),0 20px 46px rgba(15,70,150,.45);
  order:-1;
}
.plan-card.featured::before{
  content:"推荐口径";position:absolute;top:-11px;right:18px;
  padding:3px 12px;border-radius:999px;font-size:12px;font-weight:800;color:#03141a;
  background:linear-gradient(135deg,#25e0d0,#6ef0c4);
  box-shadow:0 8px 18px rgba(37,224,208,.35);
}
.plan-top{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:10px;}
.plan-name{font-size:17px;font-weight:800;letter-spacing:.3px;}
.plan-meta{font-size:12.5px;color:var(--muted-2);}
.plan-list{display:grid;gap:7px;margin-bottom:14px;}
.plan-list li{font-size:14px;color:var(--muted);display:flex;gap:9px;align-items:flex-start;line-height:1.7;}
.plan-list li::before{content:"";flex:0 0 auto;width:6px;height:6px;margin-top:9px;border-radius:50%;background:var(--brand);box-shadow:0 0 9px rgba(61,139,255,.85);}
.plan-card.featured .plan-list li{color:#d3eae9;}
.plan-card.featured .plan-list li::before{background:var(--accent);box-shadow:0 0 9px var(--accent);}
.plan-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px dashed rgba(122,168,255,.22);padding-top:13px;}
.plan-price{font-size:13.5px;color:var(--muted-2);}

/* ============ Cards / Grids ============ */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.card{
  position:relative;border:1px solid var(--border);border-radius:var(--radius);
  background:var(--panel);padding:24px;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,background .2s ease;
}
.card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 18px 40px rgba(2,8,22,.55);background:var(--panel-2);}
.card-icon{
  width:40px;height:40px;border-radius:11px;display:grid;place-items:center;
  background:rgba(61,139,255,.16);border:1px solid rgba(122,182,255,.32);
  color:#9fc8ff;margin-bottom:14px;
}
.card-icon svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.card h3{font-size:17.5px;font-weight:800;margin-bottom:9px;letter-spacing:.2px;}
.card p{font-size:14.5px;color:var(--muted);line-height:1.82;}
.card .badge{margin-bottom:10px;}

/* ============ Stats ============ */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.stat{
  border:1px solid var(--border);border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(61,139,255,.14),rgba(255,255,255,.03));
  padding:22px 20px;text-align:left;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.stat:hover{transform:translateY(-3px);border-color:var(--border-strong);box-shadow:0 14px 32px rgba(2,8,22,.5);}
.stat-num{font-size:32px;font-weight:900;letter-spacing:.5px;color:#eaf4ff;line-height:1.1;}
.stat-num span{font-size:15px;font-weight:700;color:var(--accent);margin-left:4px;}
.stat-label{font-size:13.5px;color:var(--muted);margin-top:6px;}

/* ============ Table ============ */
.table-wrap{
  overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);
  background:rgba(255,255,255,.03);box-shadow:0 16px 36px rgba(2,8,22,.35);
  -webkit-overflow-scrolling:touch;
}
table{width:100%;border-collapse:collapse;min-width:720px;font-size:14.5px;}
thead th{
  background:rgba(61,139,255,.14);color:#cfe2ff;font-weight:800;font-size:14px;
  padding:14px 16px;text-align:left;white-space:nowrap;
  border-bottom:1px solid rgba(122,182,255,.28);
}
tbody td{padding:14px 16px;border-bottom:1px solid rgba(122,168,255,.10);color:var(--muted);vertical-align:top;}
tbody td:first-child{color:#e4eeff;font-weight:700;white-space:nowrap;}
tbody tr:hover td{background:rgba(61,139,255,.07);color:#cfe0f8;}
tbody tr:last-child td{border-bottom:0;}
td strong{color:var(--accent);font-weight:700;}

/* ============ Steps ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step;}
.step{
  position:relative;border:1px solid var(--border);border-radius:var(--radius);
  background:var(--panel);padding:24px 22px 22px;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.step:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 16px 36px rgba(2,8,22,.5);}
.step-num{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  font-size:15px;font-weight:900;color:#04101f;
  background:linear-gradient(140deg,#3d8bff,#25e0d0);
  box-shadow:0 8px 18px rgba(37,224,208,.25);margin-bottom:14px;
}
.step h3{font-size:16.5px;font-weight:800;margin-bottom:8px;}
.step p{font-size:14px;color:var(--muted);line-height:1.8;}

/* ============ Split / Media ============ */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;}
.split-media{position:relative;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);}
.split-media img{width:100%;height:100%;aspect-ratio:16/11;object-fit:cover;transition:transform .5s ease;}
.split-media:hover img{transform:scale(1.04);}
.split-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(3,7,17,0) 40%,rgba(3,7,17,.78) 100%);
}
.media-caption{
  position:absolute;left:18px;right:18px;bottom:16px;z-index:2;
  font-size:13.5px;color:#cfe0f8;line-height:1.7;
}
.split-body h2{font-size:26px;line-height:1.4;font-weight:800;margin:12px 0 14px;}
.split-body p{font-size:15px;color:var(--muted);line-height:1.85;margin-bottom:14px;}

/* ============ List ============ */
.check-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.check-item{
  display:flex;gap:12px;align-items:flex-start;
  border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--panel);padding:16px 18px;
  font-size:14.5px;color:var(--muted);line-height:1.8;
  transition:border-color .2s ease,background .2s ease,transform .2s ease;
}
.check-item:hover{border-color:var(--border-strong);background:var(--panel-2);transform:translateY(-2px);}
.check-item .tick{
  flex:0 0 auto;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  background:rgba(37,224,208,.16);border:1px solid rgba(37,224,208,.4);
  color:var(--accent);font-size:12px;font-weight:900;margin-top:2px;
}
.check-item b{color:#e6efff;font-weight:700;}

/* ============ FAQ ============ */
.faq{display:grid;gap:12px;max-width:900px;}
.faq-item{
  border:1px solid var(--border);border-radius:var(--radius);
  background:var(--panel);overflow:hidden;
  transition:border-color .2s ease,background .2s ease,box-shadow .2s ease;
}
.faq-item:hover{border-color:var(--border-strong);background:var(--panel-2);}
.faq-item[open]{border-color:rgba(37,224,208,.42);box-shadow:0 14px 34px rgba(2,8,22,.45);}
.faq-item summary{
  cursor:pointer;list-style:none;position:relative;
  padding:17px 54px 17px 20px;font-size:15.5px;font-weight:700;color:#e8f1ff;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);
  width:24px;height:24px;line-height:22px;text-align:center;border-radius:7px;
  color:var(--accent);font-size:17px;font-weight:700;
  background:rgba(37,224,208,.10);border:1px solid rgba(37,224,208,.28);
  transition:transform .2s ease;
}
.faq-item[open] summary::after{content:"−";transform:translateY(-50%) rotate(180deg);}
.faq-body{padding:0 20px 18px;font-size:14.5px;color:var(--muted);line-height:1.85;border-top:1px dashed rgba(122,168,255,.18);padding-top:14px;margin-top:-2px;}

/* ============ Channel ============ */
.channel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.channel-card{
  display:block;position:relative;overflow:hidden;
  border:1px solid var(--border);border-radius:var(--radius);
  background:linear-gradient(155deg,rgba(61,139,255,.13),rgba(255,255,255,.03));
  padding:24px;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.channel-card:hover{transform:translateY(-5px);border-color:rgba(37,224,208,.5);box-shadow:0 20px 44px rgba(2,8,22,.6);}
.channel-card h3{font-size:18px;font-weight:800;margin:10px 0 8px;}
.channel-card p{font-size:14px;color:var(--muted);line-height:1.8;}
.channel-more{margin-top:14px;font-size:13.5px;font-weight:700;color:var(--accent);display:inline-flex;align-items:center;gap:6px;}
.channel-more::after{content:"→";transition:transform .2s ease;}
.channel-card:hover .channel-more::after{transform:translateX(4px);}

/* ============ CTA Band ============ */
.cta-band{
  position:relative;overflow:hidden;
  border:1px solid rgba(122,182,255,.34);border-radius:var(--radius-lg);
  background:
    radial-gradient(600px 260px at 12% 0%,rgba(61,139,255,.30),transparent 70%),
    radial-gradient(500px 240px at 92% 100%,rgba(37,224,208,.22),transparent 70%),
    rgba(255,255,255,.04);
  padding:44px 40px;
  box-shadow:var(--shadow);
  display:grid;grid-template-columns:1.25fr .75fr;gap:32px;align-items:center;
}
.cta-band h2{font-size:26px;line-height:1.4;font-weight:800;margin-bottom:10px;}
.cta-band p{font-size:15px;color:var(--muted);line-height:1.85;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:flex-end;}

/* ============ Footer ============ */
.site-footer{
  border-top:1px solid rgba(122,168,255,.16);
  background:linear-gradient(180deg,rgba(5,10,22,.4),rgba(3,7,17,.9));
  padding:56px 0 26px;margin-top:20px;
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:44px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;margin-bottom:14px;}
.footer-about{font-size:14px;color:var(--muted);line-height:1.85;max-width:420px;}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.footer-tags span{
  padding:4px 12px;border-radius:999px;font-size:12.5px;color:#a9c3e6;
  background:rgba(61,139,255,.10);border:1px solid rgba(122,182,255,.20);
}
.footer-col h4{font-size:14.5px;font-weight:800;color:#dbe8ff;margin-bottom:14px;letter-spacing:.4px;}
.footer-col ul{display:grid;gap:10px;}
.footer-col a{font-size:14px;color:var(--muted);}
.footer-col a:hover{color:var(--accent);}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid rgba(122,168,255,.14);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:var(--muted-2);line-height:1.7;
}

/* ============ Responsive ============ */
@media (max-width:1024px){
  .nav-toggle{display:flex;margin-left:auto;}
  .nav{
    position:absolute;top:64px;left:0;right:0;margin-left:0;
    flex-direction:column;align-items:stretch;gap:6px;
    padding:14px 20px 18px;display:none;
    background:rgba(5,10,22,.98);
    border-bottom:1px solid rgba(122,182,255,.24);
    box-shadow:0 18px 34px rgba(2,8,22,.6);
  }
  .nav.is-open{display:flex;}
  .nav-link{padding:12px 14px;font-size:15.5px;}
  .nav-cta{margin-left:auto;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-sub{max-width:none;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .stats{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);}
  .channel-grid{grid-template-columns:1fr;}
  .split{grid-template-columns:1fr;gap:30px;}
  .cta-band{grid-template-columns:1fr;padding:34px 26px;}
  .cta-actions{justify-content:flex-start;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px;}
}
@media (max-width:768px){
  .section{padding:58px 0;}
  .section-title{font-size:24px;}
  .grid-2,.grid-3{grid-template-columns:1fr;}
  .check-list{grid-template-columns:1fr;}
  .nav-cta{display:none;}
  .hero{padding:44px 0 52px;}
  .hero-actions .btn{flex:1 1 auto;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;}
  .split-body h2{font-size:22px;}
}
@media (max-width:520px){
  .container{padding:0 18px;}
  body{font-size:15.5px;}
  .card{padding:20px;}
  .stats{grid-template-columns:1fr 1fr;gap:12px;}
  .stat{padding:18px 16px;}
  .stat-num{font-size:26px;}
  .steps{grid-template-columns:1fr;}
  .hero h1{font-size:26px;}
  .plan-card{padding:16px;}
  .cta-band{padding:28px 20px;}
  .btn{padding:12px 20px;font-size:14.5px;}
  .footer-about{font-size:13.5px;}
}

/* roulang page: category3 */
:root{
  --bg:#050a16;
  --bg-soft:#0a1226;
  --bg-deep:#030711;
  --panel:rgba(255,255,255,.045);
  --panel-2:rgba(255,255,255,.075);
  --border:rgba(122,168,255,.16);
  --border-strong:rgba(122,182,255,.42);
  --text:#e9f1ff;
  --muted:#9db0cf;
  --muted-2:#7386a6;
  --brand:#3d8bff;
  --brand-deep:#1f63d6;
  --accent:#25e0d0;
  --warn:#ffcc66;
  --glow:0 0 0 1px rgba(61,139,255,.35), 0 14px 34px rgba(31,99,214,.42);
  --radius:14px;
  --radius-sm:10px;
  --radius-lg:22px;
  --shadow:0 18px 44px rgba(2,8,22,.62);
  --container:1180px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(61,139,255,.20), transparent 62%),
    radial-gradient(900px 520px at 92% 4%, rgba(37,224,208,.13), transparent 60%),
    linear-gradient(180deg,#050a16 0%,#060d1e 46%,#040914 100%);
  background-attachment:fixed;
  min-height:100vh;
}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color .2s ease;}
a:hover{color:#bcd8ff;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
::selection{background:rgba(61,139,255,.4);color:#fff;}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(5,10,22,.72);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(122,168,255,.12);
  transition:box-shadow .25s ease,background .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
  background:rgba(5,10,22,.92);
  box-shadow:0 12px 30px rgba(2,8,22,.55);
  border-bottom-color:rgba(122,182,255,.26);
}
.header-inner{display:flex;align-items:center;gap:26px;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:.4px;white-space:nowrap;}
.brand-mark{
  width:32px;height:32px;border-radius:9px;flex:0 0 auto;
  display:grid;place-items:center;
  background:linear-gradient(140deg,rgba(61,139,255,.95),rgba(37,224,208,.9));
  color:#04101f;font-size:15px;font-weight:900;
  box-shadow:0 8px 20px rgba(37,224,208,.28);
}
.brand-text{color:#f2f7ff;}
.brand-text span{color:var(--accent);}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-link{
  padding:8px 14px;border-radius:9px;font-size:15px;color:var(--muted);
  border:1px solid transparent;transition:all .2s ease;white-space:nowrap;
}
.nav-link:hover{color:#fff;background:rgba(61,139,255,.14);border-color:rgba(122,182,255,.22);}
.nav-link.active{
  color:#eaf3ff;background:rgba(61,139,255,.20);
  border-color:rgba(122,182,255,.42);
  box-shadow:inset 0 0 18px rgba(61,139,255,.20);
}
.nav-cta{
  margin-left:14px;padding:10px 20px;border-radius:10px;font-size:15px;font-weight:700;
  background:linear-gradient(135deg,#3d8bff,#22c8dd);color:#03101f;
  box-shadow:var(--glow);transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;
  white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-2px);filter:brightness(1.08);color:#03101f;box-shadow:0 0 0 1px rgba(61,139,255,.55),0 18px 38px rgba(31,99,214,.55);}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;
  border:1px solid var(--border);background:rgba(255,255,255,.05);
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:#cfe2ff;border-radius:2px;transition:.25s;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ============ Buttons / Tags ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:10px;font-size:15px;font-weight:700;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;
  min-height:44px;
}
.btn-primary{background:linear-gradient(135deg,#3d8bff,#1f63d6);color:#f2f8ff;box-shadow:var(--glow);}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 0 1px rgba(61,139,255,.6),0 20px 42px rgba(31,99,214,.6);color:#fff;}
.btn-ghost{border:1px solid var(--border-strong);color:#d8e7ff;background:rgba(255,255,255,.03);}
.btn-ghost:hover{background:rgba(61,139,255,.16);border-color:#6fb0ff;transform:translateY(-3px);color:#fff;}
.btn-sm{padding:9px 18px;font-size:14px;min-height:40px;border-radius:9px;}
.tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 14px;border-radius:999px;font-size:13px;color:#b8d3f6;
  background:rgba(61,139,255,.12);border:1px solid rgba(122,182,255,.24);
}
.tag-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);}
.badge{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;
  color:#9fe9ff;background:rgba(37,224,208,.12);border:1px solid rgba(37,224,208,.3);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:1.6px;
  color:#8fc2ff;text-transform:uppercase;font-weight:700;
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--accent));}

/* ============ Sections ============ */
.section{padding:78px 0;position:relative;}
.section--alt{background:linear-gradient(180deg,rgba(10,18,38,.85),rgba(5,10,22,.35));border-top:1px solid rgba(122,168,255,.10);border-bottom:1px solid rgba(122,168,255,.10);}
.section--deep{background:radial-gradient(900px 400px at 50% 0%,rgba(31,99,214,.20),transparent 70%),rgba(3,7,17,.72);border-top:1px solid rgba(122,168,255,.10);}
.section-head{max-width:780px;margin-bottom:36px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-title{font-size:29px;line-height:1.35;font-weight:800;letter-spacing:.3px;margin:12px 0 12px;}
.section-title em{font-style:normal;color:var(--accent);}
.section-desc{font-size:15px;color:var(--muted);line-height:1.85;}

/* ============ Hero (分类页) ============ */
.hero{padding:66px 0 60px;position:relative;overflow:hidden;}
.hero::after{
  content:"";position:absolute;inset:auto -10% -60% -10%;height:340px;
  background:radial-gradient(600px 220px at 50% 0%,rgba(37,224,208,.14),transparent 70%);
  pointer-events:none;
}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;position:relative;z-index:2;}
.hero-title{font-size:clamp(28px,3.5vw,42px);line-height:1.28;font-weight:800;letter-spacing:.4px;margin:16px 0 16px;}
.hero-title em{font-style:normal;background:linear-gradient(120deg,#6fb0ff,#25e0d0);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero-sub{font-size:16px;color:var(--muted);line-height:1.85;max-width:560px;}
.hero-tags{margin-top:26px;}
.status-bar{
  margin-top:30px;display:flex;flex-wrap:wrap;gap:12px 26px;align-items:center;
  padding:14px 20px;border-radius:12px;
  border:1px solid var(--border);background:rgba(61,139,255,.08);
  backdrop-filter:blur(10px);
}
.status-item{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:#c2d8f7;}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px rgba(37,224,208,.9);}
.icon-matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;}
.icon-tile{
  border:1px solid var(--border);border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(255,255,255,.08),rgba(255,255,255,.02));
  padding:18px 12px;text-align:center;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,background .2s ease;
  box-shadow:0 10px 26px rgba(2,8,22,.45);
}
.icon-tile:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 18px 36px rgba(31,99,214,.35);background:linear-gradient(160deg,rgba(61,139,255,.18),rgba(255,255,255,.03));}
.icon-tile svg{width:24px;height:24px;color:#7fd7ff;margin:0 auto 10px;}
.icon-tile span{display:block;font-size:13px;color:#cfe2ff;font-weight:600;line-height:1.5;}

/* ============ Cards ============ */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.card{
  position:relative;
  border:1px solid var(--border);border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(255,255,255,.075),rgba(255,255,255,.022));
  padding:26px 24px;box-shadow:var(--shadow);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,background .2s ease;
}
.card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 24px 48px rgba(2,8,22,.72),0 0 0 1px rgba(122,182,255,.22) inset;}
.card-icon{
  width:46px;height:46px;border-radius:12px;display:grid;place-items:center;
  background:rgba(61,139,255,.16);border:1px solid rgba(122,182,255,.36);
  color:#8fc2ff;margin-bottom:16px;
}
.card-icon svg{width:22px;height:22px;}
.card-title{font-size:17.5px;font-weight:700;color:#eaf3ff;margin-bottom:10px;letter-spacing:.2px;}
.card-text{font-size:14.5px;color:var(--muted);line-height:1.8;}
.card-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.card-meta span{font-size:12px;padding:3px 10px;border-radius:999px;color:#a9c9f0;background:rgba(61,139,255,.1);border:1px solid rgba(122,168,255,.2);}

/* ============ Stats ============ */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.stat{
  border:1px solid var(--border);border-radius:var(--radius);padding:24px 20px;
  background:linear-gradient(160deg,rgba(61,139,255,.14),rgba(255,255,255,.02));
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.stat:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 20px 40px rgba(31,99,214,.32);}
.stat strong{display:block;font-size:32px;line-height:1.2;font-weight:800;color:#eaf5ff;letter-spacing:.5px;}
.stat strong em{font-style:normal;color:var(--accent);font-size:20px;margin-left:4px;}
.stat span{display:block;margin-top:8px;font-size:13.5px;color:var(--muted);}

/* ============ Split ============ */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;}
.split-media{position:relative;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);}
.split-media img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3;}
.split-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,10,22,.05),rgba(5,10,22,.55));pointer-events:none;}
.split-body .section-title{margin-top:10px;}
.check-list{display:grid;gap:14px;margin-top:24px;}
.check-item{display:flex;gap:12px;align-items:flex-start;}
.check-item i{
  flex:0 0 auto;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  background:rgba(37,224,208,.14);border:1px solid rgba(37,224,208,.36);
  color:var(--accent);font-style:normal;font-size:12px;font-weight:800;margin-top:3px;
}
.check-item p{font-size:14.5px;color:var(--muted);line-height:1.8;}
.check-item p b{color:#dfeaff;font-weight:700;}

/* ============ Steps ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.step{
  border:1px solid var(--border);border-radius:var(--radius);padding:24px 20px;
  background:rgba(255,255,255,.035);position:relative;
  transition:transform .2s ease,border-color .2s ease,background .2s ease,box-shadow .2s ease;
}
.step:hover{transform:translateY(-4px);border-color:var(--border-strong);background:rgba(61,139,255,.12);box-shadow:0 20px 40px rgba(2,8,22,.6);}
.step-num{
  display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;
  background:linear-gradient(140deg,rgba(61,139,255,.9),rgba(37,224,208,.85));
  color:#04101f;font-weight:900;font-size:14px;margin-bottom:14px;
}
.step h3{font-size:16px;font-weight:700;color:#e6f1ff;margin-bottom:8px;}
.step p{font-size:14px;color:var(--muted);line-height:1.75;}

/* ============ Post list ============ */
.post-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.post-card{
  border:1px solid var(--border);border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
  padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.post-card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:0 24px 46px rgba(2,8,22,.72);}
.post-card h3{font-size:16px;font-weight:700;line-height:1.55;color:#eaf3ff;}
.post-card h3 a:hover{color:#9fd0ff;}
.post-card p{font-size:14px;color:var(--muted);line-height:1.78;}
.post-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--muted-2);padding-top:6px;border-top:1px solid rgba(122,168,255,.12);}
.post-foot .badge{font-size:11.5px;}
.list-empty{
  border:1px dashed rgba(122,168,255,.32);border-radius:var(--radius);
  padding:36px 24px;text-align:center;color:var(--muted);font-size:14.5px;
  background:rgba(61,139,255,.05);
}

/* ============ FAQ ============ */
.faq-list{display:grid;gap:12px;max-width:900px;}
.faq-item{
  border:1px solid var(--border);border-radius:12px;
  background:rgba(255,255,255,.035);overflow:hidden;
  transition:border-color .2s ease,background .2s ease;
}
.faq-item[open]{border-color:var(--border-strong);background:rgba(61,139,255,.1);}
.faq-item summary{
  cursor:pointer;list-style:none;padding:18px 22px;font-size:15.5px;font-weight:700;color:#e6f1ff;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:20px;line-height:1;color:var(--accent);transition:transform .2s ease;}
.faq-item[open] summary::after{content:"−";}
.faq-item .faq-body{padding:0 22px 20px;font-size:14.5px;color:var(--muted);line-height:1.85;}

/* ============ CTA band ============ */
.cta-band{
  border-radius:var(--radius-lg);
  border:1px solid rgba(122,182,255,.34);
  background:linear-gradient(135deg,rgba(61,139,255,.20),rgba(37,224,208,.10)),rgba(3,7,17,.72);
  padding:46px 44px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  box-shadow:0 24px 60px rgba(2,8,22,.7);
}
.cta-band h2{font-size:26px;font-weight:800;line-height:1.4;margin-bottom:10px;}
.cta-band p{font-size:14.5px;color:var(--muted);max-width:640px;line-height:1.8;}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ============ Footer ============ */
.site-footer{
  border-top:1px solid rgba(122,168,255,.14);
  background:linear-gradient(180deg,rgba(3,7,17,.55),rgba(3,7,17,.95));
  padding:56px 0 26px;
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:42px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:800;margin-bottom:16px;}
.footer-brand .brand-mark{width:30px;height:30px;font-size:14px;}
.footer-about{font-size:14px;color:var(--muted);line-height:1.85;max-width:460px;}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.footer-tags span{
  font-size:12px;padding:4px 12px;border-radius:999px;
  color:#a8c6ee;background:rgba(61,139,255,.1);border:1px solid rgba(122,168,255,.22);
}
.footer-col h4{font-size:15px;color:#dbe9ff;margin-bottom:16px;letter-spacing:.5px;font-weight:700;}
.footer-col ul{display:grid;gap:11px;}
.footer-col a{font-size:14px;color:var(--muted);}
.footer-col a:hover{color:#bcd8ff;}
.footer-bottom{
  margin-top:38px;padding-top:20px;border-top:1px solid rgba(122,168,255,.12);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:13px;color:var(--muted-2);
}

/* ============ Responsive ============ */
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;gap:36px;}
  .hero-sub{max-width:none;}
  .card-grid{grid-template-columns:repeat(2,1fr);}
  .post-list{grid-template-columns:repeat(2,1fr);}
  .stats{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);}
  .split{grid-template-columns:1fr;gap:34px;}
}
@media (max-width:900px){
  .nav{
    position:absolute;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:6px;
    padding:14px 20px 20px;margin-left:0;
    background:rgba(5,10,22,.98);
    border-bottom:1px solid rgba(122,182,255,.26);
    box-shadow:0 20px 40px rgba(2,8,22,.6);
    display:none;
  }
  .nav.is-open{display:flex;}
  .nav-link{padding:12px 14px;font-size:15.5px;}
  .nav-toggle{display:flex;margin-left:auto;}
  .nav-cta{display:none;}
  .header-inner{gap:14px;}
  .section{padding:58px 0;}
  .section-title{font-size:25px;}
  .cta-band{padding:34px 26px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:620px){
  .container{padding:0 18px;}
  .hero{padding:44px 0 46px;}
  .hero-title{font-size:27px;}
  .hero-sub{font-size:15px;}
  .card-grid,.post-list,.stats,.steps{grid-template-columns:1fr;}
  .icon-matrix{grid-template-columns:repeat(2,1fr);}
  .cta-band{flex-direction:column;align-items:flex-start;padding:30px 22px;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1 1 auto;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-bottom{flex-direction:column;}
  .section{padding:48px 0;}
  .section-title{font-size:23px;}
  .btn{width:100%;}
  .status-bar{padding:12px 14px;gap:10px 18px;}
  .status-item{font-size:12.5px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  html{scroll-behavior:auto;}
}