/* 91POAPP · 琥珀绯夜 — Velvet Ember Theme */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-deep:#08060e;
  --bg-panel:#12101c;
  --bg-card:#1a1628;
  --ember:#ff7a18;
  --ember-soft:#ff9a4d;
  --crimson:#c41e5a;
  --violet:#6d28d9;
  --gold:#d4a853;
  --text:#ece8f4;
  --text-dim:#9b93ad;
  --border:rgba(255,122,24,.14);
  --glow:0 0 40px rgba(255,122,24,.18);
  --radius:14px;
  --nav-h:58px;
  --sticky-h:0px;
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-display:Georgia,"Songti SC",serif;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:var(--font-sans);
  background:var(--bg-deep);
  color:var(--text);
  line-height:1.75;
  min-height:100vh;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%,rgba(196,30,90,.12),transparent),
    radial-gradient(ellipse 60% 40% at 100% 80%,rgba(255,122,24,.08),transparent);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--ember-soft);text-decoration:none;transition:color .2s}
a:hover{color:var(--ember)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:900;
  height:var(--nav-h);
  background:rgba(8,6,14,.92);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
}
.header-inner{
  max-width:1120px;margin:0 auto;padding:0 20px;
  height:100%;display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:1.1rem}
.brand img{border-radius:10px;width:38px;height:38px}
.brand em{font-style:normal;color:var(--ember);font-family:var(--font-display)}
.nav-toggle{
  display:none;background:none;border:none;cursor:pointer;padding:6px;
}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;border-radius:2px;transition:.3s}
.site-nav{display:flex;gap:6px}
.site-nav a{
  padding:8px 14px;border-radius:8px;font-size:.88rem;color:var(--text-dim);
}
.site-nav a:hover,.site-nav a.active{color:var(--ember);background:rgba(255,122,24,.08)}
.btn-dl{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 22px;border-radius:999px;
  background:linear-gradient(135deg,var(--ember),var(--crimson));
  color:#fff;font-weight:600;font-size:.9rem;border:none;cursor:pointer;
  box-shadow:var(--glow);transition:transform .2s,box-shadow .2s;
}
.btn-dl:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(255,122,24,.35);color:#fff}

/* Sticky download bar */
.sticky-ads-bar{
  position:fixed;top:var(--nav-h);left:0;right:0;z-index:850;
  background:rgba(12,10,20,.96);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  transform:translateY(-100%);
  opacity:0;pointer-events:none;
  transition:transform .35s ease,opacity .35s ease;
}
.sticky-ads-bar.visible{transform:translateY(0);opacity:1;pointer-events:auto}
.sticky-ads-bar .wrap{padding:8px 12px}
#sticky-ads{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}

/* Ad zone */
.ad-zone{
  padding-top:calc(var(--nav-h) + 12px);
  background:linear-gradient(180deg,rgba(255,122,24,.06),transparent);
}
.ad-zone-label{
  text-align:center;font-size:.75rem;color:var(--text-dim);
  letter-spacing:.12em;text-transform:uppercase;margin-bottom:6px;
}
#ads{
  display:flex;justify-content:center;align-items:flex-start;flex-wrap:wrap;
  background:transparent;margin:10px 0;
}
#ads>div,#sticky-ads>div{
  display:flex;flex-direction:column;align-items:center;
  width:calc(12.5% - 8px);min-width:70px;box-sizing:border-box;
}
#ads img,#sticky-ads img{
  width:65px;height:65px;object-fit:cover;border-radius:18px;
  box-shadow:0 6px 18px rgba(0,0,0,.35);
  transition:transform .18s ease,box-shadow .18s ease;
  border:2px solid rgba(255,122,24,.2);
}
#ads a,#sticky-ads a{display:inline-block;text-decoration:none;border-radius:15px}
#ads img:hover,#sticky-ads img:hover{
  transform:translateY(-4px) scale(1.04);
  box-shadow:0 10px 24px rgba(255,122,24,.25);
}
#ads figcaption,#ads .caption,#sticky-ads figcaption,#sticky-ads .caption{
  height:15px;font-size:11px;color:var(--text-dim);text-align:center;
  max-width:100px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:4px;
}
@media(max-width:768px){
  #ads>div,#sticky-ads>div{width:calc(25% - 8px)}
}

/* Hero */
.hero{
  padding:48px 0 64px;position:relative;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;top:20%;right:-10%;width:400px;height:400px;
  background:radial-gradient(circle,rgba(196,30,90,.15),transparent 70%);
  pointer-events:none;
}
.hero-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;
}
.hero-copy h1{
  font-family:var(--font-display);font-size:clamp(1.6rem,4vw,2.4rem);
  line-height:1.35;margin-bottom:18px;font-weight:700;
}
.hero-copy h1 span{
  display:block;font-size:.55em;color:var(--ember);
  font-family:var(--font-sans);font-weight:500;margin-top:8px;
}
.hero-lead{font-size:1.02rem;color:var(--text-dim);margin-bottom:24px}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.hero-badges span{
  padding:5px 14px;border-radius:999px;font-size:.78rem;
  background:rgba(255,122,24,.1);border:1px solid var(--border);color:var(--ember-soft);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.btn-outline{
  padding:10px 22px;border-radius:999px;
  border:1px solid var(--border);color:var(--text-dim);font-size:.9rem;
  background:transparent;cursor:pointer;transition:.2s;
}
.btn-outline:hover{border-color:var(--ember);color:var(--ember)}

/* Hero phones - 3 overlapping */
.hero-phones{position:relative;height:420px;display:flex;justify-content:center;align-items:center}
.phone-stack{position:relative;width:280px;height:380px}
.phone-frame{
  position:absolute;width:175px;border-radius:22px;overflow:hidden;
  box-shadow:0 20px 50px rgba(0,0,0,.5),0 0 0 2px rgba(255,122,24,.15);
  transition:transform .4s ease;
}
.phone-frame:nth-child(1){left:0;top:30px;z-index:1;transform:rotate(-8deg)}
.phone-frame:nth-child(2){left:52px;top:0;z-index:3;transform:rotate(2deg)}
.phone-frame:nth-child(3){left:105px;top:40px;z-index:2;transform:rotate(10deg)}
.phone-frame img{width:100%;aspect-ratio:9/16;object-fit:cover}
.hero-phones:hover .phone-frame:nth-child(1){transform:rotate(-5deg) translateY(-6px)}
.hero-phones:hover .phone-frame:nth-child(2){transform:rotate(0deg) translateY(-10px)}
.hero-phones:hover .phone-frame:nth-child(3){transform:rotate(7deg) translateY(-4px)}

/* Main content sections */
main{padding-bottom:60px}
.section{padding:56px 0}
.section-alt{background:rgba(18,16,28,.6)}
.section-head{margin-bottom:36px}
.section-head h2{
  font-family:var(--font-display);font-size:clamp(1.3rem,3vw,1.8rem);
  margin-bottom:10px;
}
.section-head h2::after{
  content:"";display:block;width:48px;height:3px;
  background:linear-gradient(90deg,var(--ember),var(--crimson));margin-top:12px;border-radius:2px;
}
.section-head p{color:var(--text-dim);font-size:.95rem;max-width:640px}

/* Stats ribbon */
.stats-ribbon{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:48px;
}
.stat-item{
  text-align:center;padding:20px 12px;
  background:var(--bg-card);border-radius:var(--radius);
  border:1px solid var(--border);
}
.stat-item strong{display:block;font-size:1.5rem;color:var(--ember);font-family:var(--font-display)}
.stat-item span{font-size:.8rem;color:var(--text-dim)}

/* Feature rows - 3:7 ratio */
.feature-row{
  display:grid;grid-template-columns:3fr 7fr;gap:32px;
  align-items:start;margin-bottom:48px;
}
.feature-row.reverse{grid-template-columns:7fr 3fr}
.feature-row.reverse .feature-visual{order:2}
.feature-row.reverse .feature-text{order:1}
.feature-visual img{
  border-radius:var(--radius);
  box-shadow:0 12px 40px rgba(0,0,0,.4);
  border:1px solid var(--border);
}
.feature-text h3{font-size:1.15rem;margin-bottom:12px;color:var(--ember-soft)}
.feature-text p{color:var(--text-dim);margin-bottom:12px;font-size:.93rem}
.feature-text ul{margin:12px 0 0 18px;color:var(--text-dim);font-size:.9rem}
.feature-text li{margin-bottom:6px}

/* Content prose */
.prose{max-width:820px}
.prose h3{font-size:1.1rem;margin:28px 0 12px;color:var(--text)}
.prose p{margin-bottom:16px;color:var(--text-dim);font-size:.93rem}
.prose a{color:var(--ember-soft);border-bottom:1px dotted var(--ember)}

/* Text SEO blocks */
.text-seo-block{
  padding:32px 28px;background:var(--bg-card);border-radius:var(--radius);
  border:1px solid var(--border);margin-bottom:28px;
}
.text-seo-block h3{font-size:1.08rem;margin-bottom:14px;color:var(--ember-soft)}
.text-seo-block p{margin-bottom:12px}
.text-seo-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:28px}
.img-duo{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.img-duo img{border-radius:var(--radius);border:1px solid var(--border);box-shadow:0 8px 28px rgba(0,0,0,.35)}
@media(max-width:768px){.text-seo-grid,.img-duo{grid-template-columns:1fr}}

/* Pillars grid */
.pillar-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pillar-card{
  padding:28px 22px;background:var(--bg-card);border-radius:var(--radius);
  border:1px solid var(--border);transition:border-color .25s,transform .25s;
}
.pillar-card:hover{border-color:rgba(255,122,24,.35);transform:translateY(-3px)}
.pillar-card .icon{
  width:44px;height:44px;border-radius:12px;margin-bottom:16px;
  background:linear-gradient(135deg,rgba(255,122,24,.2),rgba(196,30,90,.2));
  display:flex;align-items:center;justify-content:center;font-size:1.3rem;
}
.pillar-card h4{font-size:1rem;margin-bottom:8px}
.pillar-card p{font-size:.85rem;color:var(--text-dim)}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:var(--bg-card);border-radius:var(--radius);
  border:1px solid var(--border);overflow:hidden;
}
.faq-q{
  width:100%;text-align:left;padding:16px 20px;
  background:none;border:none;color:var(--text);font-size:.95rem;
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;
}
.faq-q::after{content:"+";color:var(--ember);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 .35s ease,padding .35s;
  padding:0 20px;color:var(--text-dim);font-size:.88rem;
}
.faq-item.open .faq-a{max-height:300px;padding:0 20px 16px}

/* Breadcrumb */
.breadcrumb{padding:20px 0 0;font-size:.82rem;color:var(--text-dim)}
body:not(.has-top-ads) main{padding-top:calc(var(--nav-h) + 12px)}
.breadcrumb a{color:var(--text-dim)}
.breadcrumb a:hover{color:var(--ember)}
.breadcrumb span{margin:0 8px;opacity:.4}

/* Sub page */
.page-hero{padding:24px 0 32px;border-bottom:1px solid var(--border);margin-bottom:36px}
.page-hero h1{font-family:var(--font-display);font-size:clamp(1.4rem,3vw,1.9rem)}
.page-hero p{color:var(--text-dim);margin-top:8px;font-size:.92rem}
.legal-content h2{font-size:1.05rem;margin:28px 0 12px;color:var(--ember-soft)}
.legal-content p,.legal-content li{color:var(--text-dim);font-size:.9rem;margin-bottom:10px}
.legal-content ul,.legal-content ol{margin:8px 0 16px 22px}
.legal-content li{margin-bottom:6px}

/* Error pages */
.error-page{
  min-height:80vh;display:flex;align-items:center;justify-content:center;text-align:center;
  padding:calc(var(--nav-h) + 40px) 20px 60px;
}
.error-code{
  font-family:var(--font-display);font-size:clamp(4rem,12vw,7rem);
  background:linear-gradient(135deg,var(--ember),var(--crimson));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  line-height:1;
}
.error-page h1{font-size:1.3rem;margin:16px 0 8px}
.error-page p{color:var(--text-dim);margin-bottom:24px;font-size:.92rem}

/* Footer */
.site-footer{
  background:var(--bg-panel);border-top:1px solid var(--border);
  padding:40px 0 28px;
}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;margin-bottom:32px;
}
.footer-brand p{font-size:.85rem;color:var(--text-dim);margin-top:10px;max-width:320px}
.footer-col h5{font-size:.85rem;margin-bottom:12px;color:var(--text)}
.footer-col a{display:block;font-size:.82rem;color:var(--text-dim);margin-bottom:8px}
.footer-col a:hover{color:var(--ember)}
.footer-bottom{
  padding-top:20px;border-top:1px solid var(--border);
  text-align:center;font-size:.78rem;color:var(--text-dim);
}

/* Mobile nav */
@media(max-width:768px){
  .nav-toggle{display:block}
  .site-nav{
    position:fixed;top:var(--nav-h);left:0;right:0;
    background:rgba(8,6,14,.98);flex-direction:column;padding:16px;
    transform:translateY(-120%);opacity:0;pointer-events:none;
    transition:.3s;border-bottom:1px solid var(--border);
  }
  .site-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-phones{height:340px}
  .phone-stack{width:240px;height:320px}
  .phone-frame{width:145px}
  .stats-ribbon{grid-template-columns:repeat(2,1fr)}
  .feature-row,.feature-row.reverse{grid-template-columns:1fr}
  .feature-row.reverse .feature-visual,.feature-row.reverse .feature-text{order:unset}
  .pillar-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
}