*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1e6fff;
  --primary-dark:#1557cc;
  --accent:#ff6b35;
  --bg:#f5f7fb;
  --card:#fff;
  --text:#1a1a2e;
  --text-muted:#5c6370;
  --border:#e4e8ef;
  --radius:12px;
  --shadow:0 4px 24px rgba(30,111,255,.08);
  --max:1180px;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.75}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark);text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--card);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;padding:14px 20px;max-width:var(--max);margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:12px}
.logo-wrap img{width:44px;height:44px;border-radius:10px}
.logo-text{font-size:1.15rem;font-weight:700;color:var(--text);line-height:1.3}
.logo-text span{display:block;font-size:.75rem;font-weight:400;color:var(--text-muted)}
.nav-main{display:flex;gap:6px;flex-wrap:wrap}
.nav-main a{padding:8px 14px;border-radius:8px;color:var(--text);font-size:.92rem;font-weight:500}
.nav-main a:hover,.nav-main a.active{background:#eef3ff;color:var(--primary);text-decoration:none}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}

/* Hero */
.hero{background:linear-gradient(135deg,#1e6fff 0%,#4d8dff 50%,#7eb3ff 100%);color:#fff;padding:56px 20px 64px;text-align:center}
.hero h1{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800;margin-bottom:16px;line-height:1.35}
.hero-desc{font-size:1.05rem;opacity:.95;max-width:720px;margin:0 auto 28px;line-height:1.8}
.hero-btns{display:flex;gap:14px;justify-content:center;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);text-decoration:none}
.btn-primary{background:#fff;color:var(--primary);box-shadow:0 4px 20px rgba(0,0,0,.15)}
.btn-primary:hover{color:var(--primary-dark)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.7)}
.btn-outline:hover{background:rgba(255,255,255,.15);color:#fff}

/* Sections */
section{padding:56px 0}
.section-title{text-align:center;margin-bottom:12px;font-size:clamp(1.4rem,3vw,1.85rem);font-weight:800;color:var(--text)}
.section-sub{text-align:center;color:var(--text-muted);max-width:640px;margin:0 auto 40px;font-size:1rem}
.bg-white{background:var(--card)}

/* Feature grid */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.feature-card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .25s}
.feature-card:hover{transform:translateY(-4px)}
.feature-card img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}
.feature-card-body{padding:20px}
.feature-card h3{font-size:1.1rem;margin-bottom:8px;color:var(--text)}
.feature-card p{color:var(--text-muted);font-size:.92rem;line-height:1.7}

/* Content blocks */
.content-block{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:48px}
.content-block.reverse{direction:rtl}
.content-block.reverse>*{direction:ltr}
.content-block img{border-radius:var(--radius);box-shadow:var(--shadow);max-width:320px;margin:0 auto}
.content-text h2{font-size:1.45rem;margin-bottom:14px;color:var(--text)}
.content-text p{color:var(--text-muted);margin-bottom:12px;text-align:justify}
.content-text ul{margin:12px 0 12px 20px;color:var(--text-muted)}
.content-text li{margin-bottom:6px}

/* Article / legal pages */
.page-hero{background:linear-gradient(135deg,#eef3ff,#f5f7fb);padding:48px 20px;text-align:center;border-bottom:1px solid var(--border)}
.page-hero h1{font-size:clamp(1.5rem,3.5vw,2rem);margin-bottom:10px}
.page-hero p{color:var(--text-muted);max-width:600px;margin:0 auto}
.article{padding:48px 0}
.article-body{max-width:860px;margin:0 auto;background:var(--card);padding:40px;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}
.article-body h2{font-size:1.25rem;margin:28px 0 12px;color:var(--text)}
.article-body h2:first-child{margin-top:0}
.article-body p,.article-body li{color:var(--text-muted);margin-bottom:12px;text-align:justify}
.article-body ul,.article-body ol{margin:0 0 16px 24px}
.article-body a{font-weight:500}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:14px;overflow:hidden}
.faq-item summary{padding:18px 22px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::after{content:"+";font-size:1.2rem;color:var(--primary)}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 22px 18px;color:var(--text-muted);font-size:.95rem}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.88rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}

/* Download CTA */
.download-cta{background:linear-gradient(135deg,#1a1a2e,#2d3561);color:#fff;text-align:center;padding:56px 20px;border-radius:var(--radius);margin:40px 0}
.download-cta h2{font-size:1.6rem;margin-bottom:12px}
.download-cta p{opacity:.85;margin-bottom:24px;max-width:560px;margin-left:auto;margin-right:auto}

/* Footer */
.site-footer{background:#1a1a2e;color:#b0b8c8;padding:48px 20px 24px;margin-top:56px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;max-width:var(--max);margin:0 auto 32px}
.footer-brand img{width:48px;border-radius:10px;margin-bottom:12px}
.footer-brand p{font-size:.9rem;line-height:1.7;max-width:360px}
.footer-col h4{color:#fff;margin-bottom:14px;font-size:.95rem}
.footer-col a{display:block;color:#b0b8c8;font-size:.88rem;margin-bottom:8px}
.footer-col a:hover{color:#fff;text-decoration:none}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:.82rem;color:#7a8499;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;font-weight:800;color:var(--primary);line-height:1}
.error-page h2{margin:16px 0 12px}
.error-page p{color:var(--text-muted);margin-bottom:24px}

/* Image showcase strip */
.showcase-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.showcase-item{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border)}
.showcase-item img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}

/* SEO text section */
.seo-content{max-width:860px;margin:0 auto}
.seo-content h2{font-size:1.35rem;margin:32px 0 14px;color:var(--text)}
.seo-content h3{font-size:1.1rem;margin:24px 0 10px;color:var(--text)}
.seo-content p{color:var(--text-muted);margin-bottom:14px;text-align:justify;line-height:1.85}
.seo-content ul,.seo-content ol{margin:0 0 16px 24px;color:var(--text-muted)}
.seo-content li{margin-bottom:8px;line-height:1.75}

/* Tags */
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.tag{background:#eef3ff;color:var(--primary);padding:4px 12px;border-radius:20px;font-size:.82rem;font-weight:500}

@media(max-width:768px){
  .nav-main{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--card);padding:12px 20px;border-bottom:1px solid var(--border);box-shadow:0 8px 24px rgba(0,0,0,.08)}
  .nav-main.open{display:flex}
  .nav-toggle{display:block}
  .content-block{grid-template-columns:1fr;gap:24px}
  .content-block.reverse{direction:ltr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .article-body{padding:24px}
  section{padding:40px 0}
  .hero{padding:40px 20px 48px}
}