*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a8cff;
  --primary-dark:#0d6fd4;
  --accent:#ff6b35;
  --bg:#f5f8fc;
  --surface:#fff;
  --text:#1a1a2e;
  --text-muted:#5a6270;
  --border:#e2e8f0;
  --radius:12px;
  --shadow:0 4px 24px rgba(26,140,255,.08);
  --max-w:1200px;
  --header-h:64px;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:0 2px 12px rgba(0,0,0,.04)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--text)}
.logo img{width:40px;height:40px;border-radius:10px}
.nav-desktop{display:flex;gap:28px;list-style:none}
.nav-desktop a{color:var(--text);font-weight:500;font-size:.95rem}
.nav-desktop a:hover,.nav-desktop a.active{color:var(--primary)}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--text);margin:5px 0;transition:.3s}
.nav-mobile{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:16px 20px;box-shadow:var(--shadow)}
.nav-mobile.open{display:block}
.nav-mobile a{display:block;padding:12px 0;color:var(--text);font-weight:500;border-bottom:1px solid var(--border)}
.nav-mobile a:last-child{border-bottom:none}

/* Ads bar - sticky below header */
#ads-bar{
  position:sticky;
  top:var(--header-h);
  z-index:99;
  background:var(--surface);
  border-bottom:1px solid var(--border);
  box-shadow:0 2px 10px rgba(0,0,0,.06);
  padding:8px 12px;
}
#ads{
  display:flex;
  justify-content:center;
  align-items:flex-start;
  flex-wrap:wrap;
  background:transparent;
  margin:0 auto;
  max-width:var(--max-w);
  gap:6px;
}
#ads>div{
  display:flex;
  flex-direction:column;
  align-items:center;
  width:70px;
  box-sizing:border-box;
}
#ads img{
  width:65px;
  height:65px;
  object-fit:cover;
  border-radius:18px;
  box-shadow:0 6px 18px rgba(24,24,24,.12);
  transition:transform 180ms ease,box-shadow 180ms ease;
  display:block;
  border:none;
  background:linear-gradient(135deg,#fff,#fff);
}
#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(24,24,24,.18);
}
#ads figcaption,#ads .caption{
  height:15px;
  font-size:11px;
  color:#666;
  text-align:center;
  max-width:100px;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  margin-top:4px;
}

/* Hero */
.hero{background:linear-gradient(135deg,#1a8cff 0%,#0066cc 50%,#004d99 100%);color:#fff;padding:60px 0 80px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;top:-50%;right:-20%;width:60%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.08) 0%,transparent 70%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1fr 280px;gap:48px;align-items:center;position:relative;z-index:1}
.hero h1{font-size:2.2rem;line-height:1.3;margin-bottom:16px;font-weight:800}
.hero-desc{font-size:1.05rem;opacity:.92;margin-bottom:28px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:50px;font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:#fff;color:var(--primary);box-shadow:0 4px 16px rgba(0,0,0,.15)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6)}
.btn-outline:hover{background:rgba(255,255,255,.1)}
.hero-app{width:260px;margin:0 auto;border-radius:24px;box-shadow:0 20px 60px rgba(0,0,0,.3)}

/* Sections */
section{padding:64px 0}
.section-title{text-align:center;margin-bottom:12px;font-size:1.85rem;font-weight:800;color:var(--text)}
.section-sub{text-align:center;color:var(--text-muted);margin-bottom:48px;max-width:640px;margin-left:auto;margin-right:auto}
.bg-white{background:var(--surface)}

/* Feature cards */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--surface);border-radius:var(--radius);padding:28px;border:1px solid var(--border);transition:box-shadow .3s,transform .3s}
.feature-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.feature-card h3{font-size:1.15rem;margin-bottom:10px;color:var(--text)}
.feature-card p{color:var(--text-muted);font-size:.95rem}

/* Content blocks */
.content-block{margin-bottom:48px}
.content-block h2{font-size:1.5rem;margin-bottom:16px;padding-bottom:10px;border-bottom:3px solid var(--primary);display:inline-block}
.content-block h3{font-size:1.2rem;margin:24px 0 12px;color:var(--text)}
.content-block p,.content-block li{color:var(--text-muted);margin-bottom:14px}
.content-block ul,.content-block ol{padding-left:24px;margin-bottom:16px}
.content-block li{margin-bottom:8px}

/* Image showcase */
.showcase-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px;align-items:center;margin:40px 0}
.showcase-grid.reverse{direction:rtl}
.showcase-grid.reverse>*{direction:ltr}
.showcase-img{border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}
.showcase-text h3{font-size:1.3rem;margin-bottom:12px}
.showcase-text p{color:var(--text-muted);margin-bottom:12px}

/* Gallery */
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.gallery-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);background:var(--surface);transition:transform .3s}
.gallery-item:hover{transform:scale(1.03)}
.gallery-item img{width:100%;aspect-ratio:9/16;object-fit:cover}
.gallery-item figcaption{padding:10px 12px;font-size:.85rem;color:var(--text-muted);text-align:center}

/* Download section */
.download-section{background:linear-gradient(135deg,#eef5ff,#f0f7ff);border-radius:var(--radius);padding:48px;text-align:center;margin:48px 0;border:1px solid var(--border)}
.download-section h2{margin-bottom:12px}
.download-section p{color:var(--text-muted);margin-bottom:24px}
.download-badges{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.download-badge{background:var(--primary);color:#fff;padding:16px 32px;border-radius:50px;font-weight:600;display:inline-flex;align-items:center;gap:8px;transition:background .2s}
.download-badge:hover{background:var(--primary-dark);color:#fff}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;user-select:none}
.faq-q::after{content:"+";font-size:1.4rem;color:var(--primary);transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;color:var(--text-muted)}
.faq-item.open .faq-a{max-height:400px;padding:0 24px 18px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step-item{text-align:center;padding:24px 16px;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);position:relative}
.step-item::before{counter-increment:step;content:counter(step);display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--primary);color:#fff;border-radius:50%;font-weight:700;margin:0 auto 14px;font-size:.95rem}
.step-item h4{font-size:1rem;margin-bottom:8px}
.step-item p{font-size:.88rem;color:var(--text-muted)}

/* Page layout */
.page-header{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;padding:48px 0;text-align:center}
.page-header h1{font-size:2rem;margin-bottom:8px}
.page-header p{opacity:.85}
.page-content{padding-top:48px;padding-bottom:48px;max-width:860px;margin:0 auto}
.page-content h2{font-size:1.35rem;margin:32px 0 14px;color:var(--text)}
.page-content h3{font-size:1.1rem;margin:24px 0 10px}
.page-content p,.page-content li{color:var(--text-muted);margin-bottom:12px}
.page-content ul,.page-content ol{padding-left:24px;margin-bottom:16px}
.page-content li{margin-bottom:6px}

/* Error pages */
.error-page{min-height:70vh;display:flex;align-items:center;justify-content:center;text-align:center;padding-top:40px;padding-bottom:40px}
.error-code{font-size:6rem;font-weight:800;color:var(--primary);line-height:1}
.error-page h1{font-size:1.5rem;margin:16px 0 8px}
.error-page p{color:var(--text-muted);margin-bottom:24px}

/* Footer */
.site-footer{background:#1a1a2e;color:rgba(255,255,255,.75);padding:48px 0 24px;margin-top:48px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:32px}
.footer-brand .logo{color:#fff;margin-bottom:12px}
.footer-brand p{font-size:.9rem;line-height:1.7}
.footer-col h4{color:#fff;margin-bottom:16px;font-size:1rem}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:rgba(255,255,255,.65);font-size:.9rem}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:.85rem}

/* Breadcrumb */
.breadcrumb{padding-top:16px;padding-bottom:16px;font-size:.88rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb span{margin:0 8px}

/* Internal links box */
.internal-links{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin:32px 0}
.internal-links h3{font-size:1.1rem;margin-bottom:14px}
.internal-links ul{list-style:none;display:flex;flex-wrap:wrap;gap:10px}
.internal-links li a{display:inline-block;padding:6px 16px;background:var(--bg);border-radius:20px;font-size:.88rem;border:1px solid var(--border)}
.internal-links li a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Responsive */
@media(max-width:992px){
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-btns{justify-content:center}
  .hero-app{width:220px}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .showcase-grid{grid-template-columns:1fr}
  .gallery-grid{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-desktop{display:none}
  .menu-toggle{display:block}
  .hero{padding:40px 0 56px}
  .hero h1{font-size:1.65rem}
  .features-grid,.gallery-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  section{padding:40px 0}
  .download-section{padding:32px 20px}
  body.inner-page .page-content{padding-top:32px;padding-bottom:40px}
  body.inner-page .container.page-content,
  body.inner-page .container.breadcrumb,
  body.inner-page .error-page{padding-left:20px;padding-right:20px}
  body.inner-page .page-header .container{padding-left:20px;padding-right:20px}
}
@media(max-width:480px){
  .gallery-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:1.4rem}
  .btn{padding:12px 22px;font-size:.9rem}
}