/* 91PO视频官网 - 91-m.forum 独立样式 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-deep:#060608;
  --bg-card:#111118;
  --bg-elevated:#1a1a24;
  --orange:#ff8c00;
  --orange-light:#ffb347;
  --orange-glow:rgba(255,140,0,.35);
  --purple:#8b5cf6;
  --blue:#38bdf8;
  --text:#eaeaf0;
  --text-muted:#9494a8;
  --border:rgba(255,255,255,.08);
  --radius:14px;
  --header-h:60px;
  --ads-sticky-h:0px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);background:var(--bg-deep);color:var(--text);line-height:1.75;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--orange-light);text-decoration:none;transition:color .2s}
a:hover{color:var(--orange)}
.container{width:min(1120px,92vw);margin:0 auto}

/* Header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--header-h);background:rgba(6,6,8,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 4vw}
.logo-link{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.05rem}
.logo-link img{width:38px;height:38px;border-radius:10px}
.main-nav ul{display:flex;gap:28px;list-style:none}
.main-nav a{color:var(--text-muted);font-size:.92rem;font-weight:500}
.main-nav a:hover,.main-nav a.active{color:var(--orange)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:.25s}

/* Sticky ads bar */
#ads-sticky-bar{position:fixed;top:var(--header-h);left:0;right:0;z-index:999;background:rgba(10,10,14,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transform:translateY(-110%);opacity:0;transition:transform .35s,opacity .35s;pointer-events:none}
#ads-sticky-bar.visible{transform:translateY(0);opacity:1;pointer-events:auto}
#ads-sticky-bar .ads-inner{display:flex;flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:6px 10px;padding:8px 12px;max-width:1120px;margin:0 auto}
#ads-sticky-bar .ads-inner>div{width:calc(12.5% - 9px);min-width:70px;display:flex;flex-direction:column;align-items:center}
#ads-sticky-bar .ads-inner img{width:52px;height:52px;border-radius:14px;object-fit:cover}
#ads-sticky-bar .ads-inner .caption{font-size:10px;color:var(--text-muted);text-align:center;max-width:72px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:3px}

/* Main content offset */
main{padding-top:var(--header-h)}

/* Hero */
.hero{position:relative;padding:56px 0 48px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 80% 60% at 70% 20%,rgba(255,140,0,.12),transparent 60%),radial-gradient(ellipse 50% 40% at 10% 80%,rgba(139,92,246,.08),transparent 50%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;position:relative}
.hero-badge{display:inline-block;padding:6px 16px;border-radius:999px;background:rgba(255,140,0,.12);border:1px solid rgba(255,140,0,.25);color:var(--orange-light);font-size:.82rem;font-weight:600;margin-bottom:18px;letter-spacing:.04em}
.hero h1{font-size:clamp(1.75rem,4.5vw,2.6rem);font-weight:800;line-height:1.25;color:#fff;margin-bottom:16px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--orange),var(--orange-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{color:var(--text-muted);font-size:1rem;margin-bottom:28px;max-width:520px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 28px;border-radius:999px;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn-primary{background:linear-gradient(135deg,var(--orange),#ff6a00);color:#fff;box-shadow:0 8px 28px var(--orange-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 36px var(--orange-glow);color:#fff}
.btn-outline{background:transparent;color:#fff;border:1px solid var(--border)}
.btn-outline:hover{border-color:var(--orange);color:var(--orange-light)}
.hero-metrics{display:flex;gap:32px}
.metric-num{font-size:1.5rem;font-weight:800;color:var(--orange);line-height:1.2}
.metric-label{font-size:.78rem;color:var(--text-muted);margin-top:2px}
.phone-showcase{position:relative;display:flex;justify-content:center;align-items:center;min-height:420px}
.phone-showcase::after{content:"";position:absolute;width:360px;height:360px;background:radial-gradient(circle,var(--orange-glow),transparent 70%);top:50%;left:50%;transform:translate(-50%,-50%);z-index:0}
.phone-stack{position:relative;width:min(360px,88vw);height:400px;z-index:1}
.phone-stack .phone-item{position:absolute;width:46%;border-radius:22px;overflow:hidden;border:2px solid rgba(255,255,255,.14);box-shadow:0 20px 56px rgba(0,0,0,.55);background:var(--bg-card);transition:transform .35s ease}
.phone-stack .phone-item img{width:100%;aspect-ratio:9/19;object-fit:cover;object-position:top}
.phone-stack .phone-back{left:0;top:36px;z-index:1;transform:rotate(-10deg) scale(.92);opacity:.82}
.phone-stack .phone-mid{left:50%;top:0;z-index:3;transform:translateX(-50%) scale(1.04);box-shadow:0 28px 64px rgba(255,140,0,.18),0 20px 56px rgba(0,0,0,.6)}
.phone-stack .phone-front{right:0;top:40px;z-index:2;transform:rotate(8deg) scale(.94);opacity:.88}
.phone-stack:hover .phone-back{transform:rotate(-12deg) scale(.92) translateY(-4px)}
.phone-stack:hover .phone-mid{transform:translateX(-50%) scale(1.06) translateY(-6px)}
.phone-stack:hover .phone-front{transform:rotate(10deg) scale(.94) translateY(-4px)}

/* Download zone */
.download-zone{padding:32px 0 16px;background:var(--bg-card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.ads-label{text-align:center;font-size:.85rem;color:var(--text-muted);margin-bottom:12px;letter-spacing:.06em}
#ads{display:flex;justify-content:center;align-items:flex-start;flex-wrap:wrap;gap:8px 14px;background:transparent;margin:10px 0}
#ads>div{display:flex;flex-direction:column;align-items:center;width:70px}
#ads img{width:65px;height:65px;object-fit:cover;border-radius:18px;box-shadow:0 6px 18px rgba(0,0,0,.25);transition:transform .18s,box-shadow .18s;border:none}
#ads a{display:inline-block;text-decoration:none;border-radius:15px}
#ads img:hover{transform:translateY(-4px) scale(1.04);box-shadow:0 10px 24px rgba(255,140,0,.2)}
#ads .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}

/* Sections */
.section{padding:64px 0}
.section-label{display:inline-block;font-size:.75rem;font-weight:700;color:var(--orange);letter-spacing:.12em;text-transform:uppercase;margin-bottom:10px}
.section-title{font-size:clamp(1.4rem,3vw,1.9rem);font-weight:800;color:#fff;margin-bottom:12px;line-height:1.3}
.section-desc{color:var(--text-muted);margin-bottom:40px;max-width:640px}

/* Content layout 3:7 ratio */
.content-block{display:grid;grid-template-columns:3fr 7fr;gap:36px;align-items:start;margin-bottom:48px}
.content-block.reverse{grid-template-columns:7fr 3fr}
.content-block.reverse .block-visual{order:2}
.content-block.reverse .block-text{order:1}
.block-visual{position:relative}
.block-visual img{border-radius:var(--radius);border:1px solid var(--border);box-shadow:0 16px 48px rgba(0,0,0,.35)}
.block-visual .caption-tag{position:absolute;bottom:12px;left:12px;padding:4px 12px;background:rgba(255,140,0,.9);color:#fff;font-size:.72rem;font-weight:700;border-radius:6px}
.block-text h3{font-size:1.15rem;font-weight:700;color:#fff;margin:20px 0 10px}
.block-text h3:first-child{margin-top:0}
.block-text p{color:var(--text-muted);margin-bottom:14px;font-size:.95rem}
.block-text ul{padding-left:20px;color:var(--text-muted);margin-bottom:14px}
.block-text li{margin-bottom:6px;font-size:.95rem}

/* Feature grid */
.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 22px;transition:border-color .25s,transform .25s}
.feature-card:hover{border-color:rgba(255,140,0,.3);transform:translateY(-3px)}
.feature-icon{width:44px;height:44px;border-radius:12px;background:rgba(255,140,0,.1);display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:16px}
.feature-card h3{font-size:1rem;font-weight:700;color:#fff;margin-bottom:8px}
.feature-card p{font-size:.88rem;color:var(--text-muted);line-height:1.65}

/* Preview gallery */
.preview-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px}
.preview-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);background:var(--bg-card)}
.preview-item img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}
.preview-item figcaption{padding:10px 12px;font-size:.78rem;color:var(--text-muted);text-align:center}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:40px 0}
.step-item{text-align:center;padding:24px 16px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);position:relative}
.step-num{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--orange),#ff6a00);color:#fff;font-weight:800;font-size:.9rem;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.step-item h4{font-size:.92rem;color:#fff;margin-bottom:6px}
.step-item p{font-size:.8rem;color:var(--text-muted)}

/* Channel cards */
.channel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.channel-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:border-color .25s,transform .25s}
.channel-card:hover{border-color:rgba(255,140,0,.28);transform:translateY(-3px)}
.channel-card img{width:100%;aspect-ratio:9/14;object-fit:cover;object-position:top}
.channel-card .channel-body{padding:18px 16px}
.channel-card h3{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:6px}
.channel-card p{font-size:.82rem;color:var(--text-muted);line-height:1.6}

/* Pure text SEO module */
.text-module{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 32px;margin-bottom:40px}
.text-module h3{font-size:1.1rem;font-weight:700;color:#fff;margin:28px 0 12px}
.text-module h3:first-child{margin-top:0}
.text-module p{color:var(--text-muted);font-size:.93rem;margin-bottom:14px;line-height:1.8}
.text-module ul{padding-left:22px;margin-bottom:14px}
.text-module li{color:var(--text-muted);font-size:.93rem;margin-bottom:8px;line-height:1.75}
.text-module strong{color:var(--orange-light);font-weight:600}
.text-columns{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.text-columns h3{margin-top:0}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border);padding:20px 0}
.faq-item h3{font-size:1rem;color:#fff;margin-bottom:8px;font-weight:600}
.faq-item p{font-size:.9rem;color:var(--text-muted)}

/* CTA */
.cta-section{text-align:center;padding:72px 0;background:linear-gradient(180deg,var(--bg-deep),var(--bg-card));border-top:1px solid var(--border)}
.cta-section h2{font-size:clamp(1.4rem,3vw,2rem);font-weight:800;color:#fff;margin-bottom:12px}
.cta-section p{color:var(--text-muted);margin-bottom:28px;max-width:520px;margin-left:auto;margin-right:auto}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.85rem}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;color:var(--text-muted)}
.breadcrumb li::after{content:"/";margin-left:6px;color:var(--border)}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--orange)}
.breadcrumb li[aria-current="page"]{color:var(--orange-light)}

/* Page content */
.page-hero{padding:32px 0 24px;border-bottom:1px solid var(--border);margin-bottom:32px}
.page-hero h1{font-size:clamp(1.5rem,3.5vw,2rem);font-weight:800;color:#fff;margin-bottom:8px}
.page-hero p{color:var(--text-muted);font-size:.95rem}
.prose{max-width:800px}
.prose h2{font-size:1.2rem;font-weight:700;color:#fff;margin:32px 0 12px;padding-top:8px}
.prose h2:first-child{margin-top:0}
.prose p,.prose li{color:var(--text-muted);font-size:.93rem;margin-bottom:12px}
.prose ul,.prose ol{padding-left:24px;margin-bottom:16px}
.prose a{color:var(--orange-light)}

/* Error pages */
.error-page{text-align:center;padding:80px 20px 100px}
.error-code{font-size:6rem;font-weight:900;background:linear-gradient(135deg,var(--orange),var(--purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.error-page h1{font-size:1.5rem;color:#fff;margin:16px 0 8px}
.error-page p{color:var(--text-muted);margin-bottom:28px}

/* Footer */
.site-footer{background:var(--bg-card);border-top:1px solid var(--border);padding:48px 0 24px;margin-top:48px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer-brand img{width:42px;height:42px;border-radius:10px;margin-bottom:12px}
.footer-brand p{font-size:.85rem;color:var(--text-muted);max-width:280px;line-height:1.65}
.footer-col h4{font-size:.85rem;font-weight:700;color:#fff;margin-bottom:14px;letter-spacing:.04em}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{font-size:.85rem;color:var(--text-muted)}
.footer-col a:hover{color:var(--orange)}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid var(--border);font-size:.8rem;color:var(--text-muted)}

/* Mobile bottom ads */
@media(max-width:768px){
  .nav-toggle{display:flex}
  .main-nav{position:fixed;top:var(--header-h);left:0;right:0;background:rgba(10,10,14,.98);padding:20px;border-bottom:1px solid var(--border);transform:translateY(-120%);opacity:0;pointer-events:none;transition:.3s}
  .main-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .main-nav ul{flex-direction:column;gap:16px}
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-actions{justify-content:center}
  .hero-metrics{justify-content:center}
  .phone-showcase{order:-1;margin-bottom:20px;min-height:320px}
  .phone-stack{height:340px;width:min(300px,90vw)}
  .phone-stack .phone-item{width:44%}
  .channel-grid{grid-template-columns:1fr}
  .text-columns{grid-template-columns:1fr;gap:0}
  .content-block,.content-block.reverse{grid-template-columns:1fr}
  .content-block.reverse .block-visual,.content-block.reverse .block-text{order:unset}
  .feature-grid{grid-template-columns:1fr}
  .preview-row{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  #ads-sticky-bar{top:auto;bottom:0;border-top:1px solid var(--border);border-bottom:none;padding-bottom:env(safe-area-inset-bottom,0)}
  #ads-sticky-bar .ads-inner{padding:10px 8px}
  #ads-sticky-bar .ads-inner>div{width:calc(25% - 8px);min-width:60px}
  #ads-sticky-bar .ads-inner img{width:48px;height:48px}
  body.has-sticky-ads{padding-bottom:calc(80px + env(safe-area-inset-bottom,0))}
}

@media(max-width:480px){
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-metrics{flex-direction:column;gap:16px;align-items:center}
}

@media(min-width:769px){
  body.has-sticky-ads main{padding-top:calc(var(--header-h) + var(--ads-sticky-h))}
}