*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-deep:#08080e;
  --bg-card:#12121c;
  --bg-elevated:#1a1a28;
  --orange:#ff8c00;
  --orange-dim:#e67a00;
  --purple:#8b5cf6;
  --purple-soft:rgba(139,92,246,.15);
  --text:#ececf4;
  --text-muted:#9898ae;
  --border:rgba(255,255,255,.07);
  --radius:14px;
  --nav-h:62px;
  --sticky-h:0px;
  --max:1140px;
  --serif:Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:var(--sans);
  background:var(--bg-deep);
  color:var(--text);
  line-height:1.75;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;inset:0;z-index:-1;
  background:
    radial-gradient(ellipse 80% 50% at 15% -10%,rgba(255,140,0,.12),transparent),
    radial-gradient(ellipse 60% 40% at 85% 5%,rgba(139,92,246,.1),transparent),
    var(--bg-deep);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--orange);text-decoration:none;transition:color .2s}
a:hover{color:#ffb347}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:900;
  background:rgba(8,8,14,.92);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:var(--nav-h);gap:16px;
}
.brand{
  display:flex;align-items:center;gap:12px;color:var(--text);
}
.brand img{width:42px;height:42px;border-radius:10px}
.brand-text strong{display:block;font-size:1rem;letter-spacing:.02em}
.brand-text em{font-style:normal;font-size:.68rem;color:var(--text-muted);letter-spacing:.12em}
.main-nav{display:flex;gap:6px}
.main-nav a{
  color:var(--text-muted);font-size:.88rem;padding:8px 14px;border-radius:8px;
}
.main-nav a:hover,.main-nav a.active{color:var(--text);background:var(--purple-soft)}
.menu-toggle{
  display:none;background:none;border:none;cursor:pointer;padding:8px;
}
.menu-toggle span{
  display:block;width:22px;height:2px;background:var(--text);margin:5px 0;border-radius:2px;
  transition:transform .25s,opacity .25s;
}
.mobile-nav{
  display:none;position:fixed;inset:0;top:var(--nav-h);z-index:850;
  background:rgba(8,8,14,.97);padding:24px 20px;flex-direction:column;gap:4px;
}
.mobile-nav.open{display:flex}
.mobile-nav a{
  color:var(--text);font-size:1.05rem;padding:14px 16px;border-radius:10px;
  border-bottom:1px solid var(--border);
}
.mobile-nav a.active{color:var(--orange)}

/* Sticky download bar */
.sticky-dl{
  display:none;
  position:fixed;left:0;right:0;top:var(--nav-h);z-index:800;
  background:rgba(18,18,28,.96);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.sticky-dl.visible{display:block}
.sticky-dl .ad-grid{padding:8px 0}

/* Ad zone */
.dl-zone{
  padding:20px 0 16px;
  background:linear-gradient(180deg,rgba(255,140,0,.06),transparent);
  border-bottom:1px solid var(--border);
}
.dl-zone-head{text-align:center;margin-bottom:12px}
.dl-zone-head h2{font-size:1.15rem;font-weight:600;margin-bottom:4px}
.dl-zone-head p{font-size:.85rem;color:var(--text-muted)}
#ads:empty{min-height:0}
#ads:empty+.dl-zone-hint{display:none}
#ads,.ad-grid{
  display:flex;justify-content:center;align-items:flex-start;flex-wrap:wrap;
  gap:8px 4px;
}
#ads>div,.ad-grid>div{
  display:flex;flex-direction:column;align-items:center;
  width:calc(12.5% - 4px);min-width:70px;box-sizing:border-box;
}
#ads img,.ad-grid img{
  width:65px;height:65px;object-fit:cover;border-radius:18px;
  box-shadow:0 6px 18px rgba(0,0,0,.35);
  transition:transform .18s,box-shadow .18s;
  border:none;background:linear-gradient(135deg,#fff,#fff);
}
#ads a,.ad-grid a{display:inline-block;text-decoration:none;border-radius:15px}
#ads img:hover,.ad-grid img:hover{
  transform:translateY(-4px) scale(1.04);
  box-shadow:0 10px 24px rgba(255,140,0,.25);
}
#ads .caption,.ad-grid .caption{
  height:15px;font-size:11px;color:var(--text-muted);text-align:center;
  max-width:100px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:4px;
}
@media(max-width:768px){
  #ads>div,.ad-grid>div{width:calc(25% - 4px)}
}

/* Hero */
.hero{
  padding:56px 0 72px;position:relative;overflow:hidden;
}
.hero-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;
}
.hero-copy h1{
  font-family:var(--serif);font-size:clamp(1.75rem,4.5vw,2.65rem);
  line-height:1.25;font-weight:700;margin-bottom:16px;
}
.hero-copy h1 span{color:var(--orange)}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--purple-soft);border:1px solid rgba(139,92,246,.3);
  padding:6px 14px;border-radius:999px;font-size:.78rem;color:var(--purple);
  margin-bottom:20px;letter-spacing:.06em;
}
.hero-lead{font-size:1.05rem;color:var(--text-muted);margin-bottom:28px;max-width:520px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px}
.hero-tags span{
  font-size:.78rem;padding:6px 14px;border-radius:8px;
  background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-muted);
}
.hero-visual{position:relative;height:420px;display:flex;justify-content:center;align-items:center}
.hero-phone{
  position:absolute;width:38%;border-radius:22px;
  box-shadow:0 24px 60px rgba(0,0,0,.55);
  border:2px solid rgba(255,255,255,.08);
  transition:transform .4s;
}
.hero-phone:nth-child(1){z-index:4;transform:rotate(-8deg) translateX(-30%);top:8%}
.hero-phone:nth-child(2){z-index:3;transform:rotate(4deg) translateX(10%);top:18%;width:36%}
.hero-phone:nth-child(3){z-index:2;transform:rotate(-3deg) translateX(-5%);top:32%;width:34%;opacity:.92}
.hero-phone:nth-child(4){z-index:1;transform:rotate(6deg) translateX(25%);top:42%;width:32%;opacity:.85}

/* Stats strip */
.stats-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--border);border-radius:var(--radius);overflow:hidden;
  margin:-24px auto 64px;max-width:var(--max);
}
.stats-strip div{
  background:var(--bg-card);padding:24px 16px;text-align:center;
}
.stats-strip strong{display:block;font-size:1.5rem;color:var(--orange);font-weight:700}
.stats-strip span{font-size:.78rem;color:var(--text-muted)}

/* Sections */
.section{padding:64px 0}
.section-label{
  font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--orange);margin-bottom:10px;
}
.section-title{
  font-family:var(--serif);font-size:clamp(1.4rem,3vw,1.85rem);
  margin-bottom:12px;line-height:1.35;
}
.section-desc{color:var(--text-muted);margin-bottom:40px;max-width:640px}

/* Split 3:7 layout */
.split-row{
  display:grid;grid-template-columns:3fr 7fr;gap:40px;align-items:start;
  margin-bottom:56px;
}
.split-row.reverse{grid-template-columns:7fr 3fr}
.split-row.reverse .split-media{order:2}
.split-row.reverse .split-text{order:1}
.split-media img{border-radius:var(--radius);box-shadow:0 16px 48px rgba(0,0,0,.4)}
.split-text h3{font-size:1.15rem;margin-bottom:12px;color:var(--text)}
.split-text p{color:var(--text-muted);margin-bottom:12px;font-size:.95rem}
.split-text ul{margin:12px 0 0 18px;color:var(--text-muted);font-size:.92rem}
.split-text li{margin-bottom:6px}

/* Feature cards */
.feature-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
.feature-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px 24px;
  transition:border-color .25s,transform .25s;
}
.feature-card:hover{border-color:rgba(255,140,0,.35);transform:translateY(-3px)}
.feature-icon{
  width:48px;height:48px;border-radius:12px;
  background:linear-gradient(135deg,var(--orange),var(--purple));
  display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;margin-bottom:16px;
}
.feature-card h3{font-size:1rem;margin-bottom:8px}
.feature-card p{font-size:.88rem;color:var(--text-muted);line-height:1.65}

/* Module tabs visual */
.module-showcase{
  display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:32px;
}
.module-item{
  text-align:center;padding:20px 10px;
  background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);
}
.module-item em{
  display:block;font-style:normal;font-size:.72rem;color:var(--orange);
  margin-bottom:6px;letter-spacing:.08em;
}
.module-item strong{font-size:.85rem}

/* Timeline guide */
.timeline{position:relative;padding-left:32px;margin-top:32px}
.timeline::before{
  content:"";position:absolute;left:10px;top:0;bottom:0;width:2px;
  background:linear-gradient(180deg,var(--orange),var(--purple));
}
.timeline-item{position:relative;margin-bottom:32px}
.timeline-item::before{
  content:"";position:absolute;left:-26px;top:6px;
  width:12px;height:12px;border-radius:50%;
  background:var(--orange);border:2px solid var(--bg-deep);
}
.timeline-item h4{font-size:.95rem;margin-bottom:6px}
.timeline-item p{font-size:.88rem;color:var(--text-muted)}

/* FAQ */
.faq-list{margin-top:24px}
.faq-item{
  border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:12px;overflow:hidden;background:var(--bg-card);
}
.faq-q{
  width:100%;text-align:left;background:none;border:none;color:var(--text);
  padding:18px 20px;font-size:.95rem;cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;
  font-family:var(--sans);
}
.faq-q::after{content:"+";color:var(--orange);font-size:1.2rem;transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .3s;
  padding:0 20px;color:var(--text-muted);font-size:.88rem;
}
.faq-item.open .faq-a{max-height:600px;padding:0 20px 18px}

/* CTA band */
.cta-band{
  text-align:center;padding:56px 20px;
  background:linear-gradient(135deg,rgba(255,140,0,.12),rgba(139,92,246,.1));
  border-top:1px solid var(--border);border-bottom:1px solid var(--border);
}
.cta-band h2{font-family:var(--serif);font-size:1.5rem;margin-bottom:10px}
.cta-band p{color:var(--text-muted);margin-bottom:24px;font-size:.92rem}
.btn-dl{
  display:inline-block;background:linear-gradient(135deg,var(--orange),var(--orange-dim));
  color:#fff;padding:14px 36px;border-radius:999px;font-weight:600;font-size:.95rem;
  border:none;cursor:pointer;transition:transform .2s,box-shadow .2s;
  box-shadow:0 8px 24px rgba(255,140,0,.3);
}
.btn-dl:hover{color:#fff;transform:translateY(-2px);box-shadow:0 12px 32px rgba(255,140,0,.4)}

/* Text-only SEO block */
.prose-block{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:36px 32px;margin-bottom:48px;
}
.prose-block h3{font-size:1.1rem;margin-bottom:14px}
.prose-block h4{font-size:.95rem;margin:18px 0 8px;color:var(--text)}
.prose-block p{color:var(--text-muted);font-size:.92rem;margin-bottom:12px}
.prose-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-bottom:48px;
}
.prose-grid .prose-block{margin-bottom:0}
.preview-gallery{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:32px 0 48px;
}
.preview-gallery figure{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.preview-gallery figcaption{
  padding:10px 12px;font-size:.78rem;color:var(--text-muted);line-height:1.5;
}

/* Breadcrumb */
.breadcrumb{
  padding:16px 0;font-size:.82rem;color:var(--text-muted);
  border-bottom:1px solid var(--border);margin-bottom:32px;
}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--orange)}
.breadcrumb span{margin:0 8px;opacity:.5}

/* Subpage content */
.page-content{padding:40px 0 80px}
.page-content h1{
  font-family:var(--serif);font-size:1.75rem;margin-bottom:24px;
}
.page-content h2{font-size:1.15rem;margin:28px 0 12px;color:var(--orange)}
.page-content p,.page-content li{
  color:var(--text-muted);font-size:.92rem;margin-bottom:10px;
}
.page-content ul,.page-content ol{margin:0 0 16px 24px}

/* Error pages */
.error-page{
  min-height:60vh;display:flex;align-items:center;justify-content:center;
  text-align:center;padding:60px 20px;
}
.error-page h1{font-size:4rem;color:var(--orange);font-family:var(--serif)}
.error-page p{color:var(--text-muted);margin:16px 0 28px}

/* Footer */
.site-footer{
  background:var(--bg-card);border-top:1px solid var(--border);
  padding:48px 0 32px;margin-top:40px;
}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;margin-bottom:32px;
}
.footer-brand img{width:36px;border-radius:8px;margin-bottom:12px}
.footer-brand p{font-size:.82rem;color:var(--text-muted);max-width:280px}
.footer-col h4{font-size:.85rem;margin-bottom:12px;color:var(--text)}
.footer-col a{
  display:block;font-size:.82rem;color:var(--text-muted);padding:4px 0;
}
.footer-bottom{
  border-top:1px solid var(--border);padding-top:20px;
  text-align:center;font-size:.75rem;color:var(--text-muted);
}

/* Responsive */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-visual{height:340px;margin-top:20px}
  .hero-phone{width:42%!important}
  .split-row,.split-row.reverse{grid-template-columns:1fr;gap:24px}
  .split-row.reverse .split-media,.split-row.reverse .split-text{order:unset}
  .feature-grid{grid-template-columns:1fr 1fr}
  .module-showcase{grid-template-columns:repeat(3,1fr)}
  .stats-strip{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{display:none}
  .menu-toggle{display:block}
  .sticky-dl{display:none!important}
  .dl-zone{
    position:sticky;
    top:var(--nav-h);
    z-index:790;
    padding:10px 0 8px;
    background:rgba(8,8,14,.95);
    backdrop-filter:blur(12px);
    border-bottom:1px solid var(--border);
  }
  .feature-grid{grid-template-columns:1fr}
  .module-showcase{grid-template-columns:repeat(2,1fr)}
  .prose-grid{grid-template-columns:1fr}
  .preview-gallery{grid-template-columns:repeat(2,1fr);gap:10px}
  .dl-zone-head{margin-bottom:8px}
  .dl-zone-head h2{font-size:1rem}
  .dl-zone-head p{font-size:.78rem}
  .hero{padding:20px 0 32px}
  .hero-copy h1{font-size:1.55rem}
  .hero-lead{font-size:.92rem;margin-bottom:18px}
  .hero-badge{margin-bottom:12px;font-size:.72rem;padding:5px 12px}
  .hero-visual{height:220px;margin-top:12px}
  .hero-phone{width:46%!important;border-radius:16px}
  .hero-phone:nth-child(1){top:0;transform:rotate(-6deg) translateX(-22%)}
  .hero-phone:nth-child(2){top:10%;transform:rotate(3deg) translateX(8%)}
  .hero-phone:nth-child(3){top:22%;transform:rotate(-2deg) translateX(-2%);width:42%!important}
  .hero-phone:nth-child(4){top:34%;transform:rotate(5deg) translateX(18%);width:40%!important}
  .stats-strip{margin:-12px auto 40px}
  .stats-strip div{padding:16px 10px}
  .stats-strip strong{font-size:1.2rem}
  .section{padding:36px 0}
  .prose-block{padding:24px 20px}
  .split-row{margin-bottom:36px}
}