*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a4bff;
  --primary-dark:#0d3ad4;
  --accent:#00c6ff;
  --text:#1a1a2e;
  --text-light:#5a5a7a;
  --bg:#f5f7fc;
  --white:#fff;
  --border:#e2e8f5;
  --shadow:0 4px 24px rgba(26,75,255,.08);
  --radius:12px;
  --max:1200px;
  --header-h:68px;
}
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:1.8}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block;border-radius:var(--radius)}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--white);box-shadow:0 2px 12px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
body.has-ads .site-header{z-index:200}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:var(--max);margin:0 auto}
.logo-link{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--text)}
.logo-link img{width:40px;height:40px;border-radius:10px}
.logo-link span{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}
.main-nav ul{display:flex;gap:6px;list-style:none}
.main-nav a{display:block;padding:8px 16px;border-radius:8px;color:var(--text-light);font-size:.95rem;font-weight:500}
.main-nav a:hover,.main-nav a.active{background:rgba(26,75,255,.08);color:var(--primary)}

/* Ads bar */
.ads-bar{position:sticky;top:var(--header-h);z-index:199;background:var(--white);box-shadow:0 2px 10px rgba(0,0,0,.08);border-bottom:1px solid var(--border)}
#ads{display:flex;justify-content:center;align-items:flex-start;flex-wrap:wrap;background:transparent;margin:10px 0;padding:0 10px;gap:8px}
#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);max-width: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(24,24,24,.18)}
#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,#1a4bff 0%,#0066ff 50%,#00c6ff 100%);color:var(--white);padding:60px 20px 80px;text-align:center;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;bottom:-40px;left:0;right:0;height:80px;background:var(--bg);border-radius:50% 50% 0 0}
.hero h1{font-size:2.2rem;margin-bottom:16px;line-height:1.3}
.hero p{font-size:1.1rem;opacity:.92;max-width:700px;margin:0 auto 30px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;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:var(--white);color:var(--primary);box-shadow:0 4px 20px rgba(0,0,0,.15)}
.btn-outline{background:transparent;color:var(--white);border:2px solid rgba(255,255,255,.6)}
.btn-outline:hover{background:rgba(255,255,255,.15)}

/* Sections */
section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.8rem;margin-bottom:10px;color:var(--text)}
.section-title p{color:var(--text-light);font-size:1rem}
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.card{background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:transform .2s}
.card:hover{transform:translateY(-4px)}
.card h3{font-size:1.15rem;margin-bottom:10px;color:var(--primary)}
.card p{color:var(--text-light);font-size:.95rem}

/* Feature showcase */
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:50px}
.feature-row.reverse{direction:rtl}
.feature-row.reverse>*{direction:ltr}
.feature-img{border-radius:var(--radius);box-shadow:var(--shadow);max-width:320px;margin:0 auto}
.feature-text h3{font-size:1.4rem;margin-bottom:14px;color:var(--text)}
.feature-text p{color:var(--text-light);margin-bottom:12px}
.feature-text ul{padding-left:20px;color:var(--text-light)}
.feature-text li{margin-bottom:6px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.step{background:var(--white);border-radius:var(--radius);padding:28px;text-align:center;box-shadow:var(--shadow);position:relative}
.step-num{width:48px;height:48px;background:linear-gradient(135deg,var(--primary),var(--accent));color:var(--white);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:700;margin:0 auto 16px}
.step h3{font-size:1.05rem;margin-bottom:8px}
.step p{color:var(--text-light);font-size:.9rem}

/* Content article */
.article{background:var(--white);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow);margin-bottom:30px}
.article h2{font-size:1.5rem;margin:30px 0 16px;color:var(--text);padding-bottom:8px;border-bottom:2px solid var(--border)}
.article h2:first-child{margin-top:0}
.article h3{font-size:1.2rem;margin:24px 0 12px;color:var(--primary)}
.article p{margin-bottom:16px;color:var(--text-light);text-align:justify}
.article ul,.article ol{margin:0 0 16px 24px;color:var(--text-light)}
.article li{margin-bottom:8px}
.article img{margin:20px auto;max-width:320px}

/* FAQ */
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-a{padding:0 24px 18px;color:var(--text-light);display:none}
.faq-item.open .faq-a{display:block}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.gallery figure{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.gallery figcaption{padding:10px 14px;font-size:.85rem;color:var(--text-light);text-align:center}

/* Download banner */
.download-banner{background:linear-gradient(135deg,var(--primary),#0066ff);color:var(--white);border-radius:var(--radius);padding:40px;text-align:center;margin:40px 0}
.download-banner h2{margin-bottom:12px}
.download-banner p{opacity:.9;margin-bottom:24px}

/* Footer */
.site-footer{background:#0f1b3d;color:rgba(255,255,255,.75);padding:50px 20px 30px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;max-width:var(--max);margin:0 auto 30px}
.footer-grid h4{color:var(--white);margin-bottom:14px;font-size:1rem}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px}
.footer-grid a{color:rgba(255,255,255,.65);font-size:.9rem}
.footer-grid a:hover{color:var(--white)}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem;max-width:var(--max);margin:0 auto}

/* Error pages */
.error-page{min-height:70vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:40px 20px}
.error-page h1{font-size:5rem;color:var(--primary);line-height:1}
.error-page h2{margin:16px 0;font-size:1.5rem}
.error-page p{color:var(--text-light);margin-bottom:24px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.9rem;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* Responsive */
@media(max-width:768px){
  .nav-toggle{display:block}
  .main-nav{position:absolute;top:100%;left:0;right:0;background:var(--white);box-shadow:0 8px 24px rgba(0,0,0,.1);display:none;padding:12px}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column}
  .hero h1{font-size:1.6rem}
  .hero{padding:40px 20px 60px}
  .feature-row{grid-template-columns:1fr;gap:24px}
  .feature-row.reverse{direction:ltr}
  .article{padding:24px}
  section{padding:40px 0}
}