*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a8cff;
  --primary-dark:#0d6fd4;
  --accent:#ff6b35;
  --bg:#f5f8fc;
  --card:#fff;
  --text:#1a1a2e;
  --text-muted:#5a6278;
  --border:#e2e8f0;
  --radius:12px;
  --shadow:0 4px 24px rgba(26,140,255,.08);
  --max:1200px;
  --header-h:72px;
}
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)}
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);box-shadow:0 2px 12px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.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:12px}
.logo-link img{width:44px;height:44px;border-radius:10px}
.logo-text{font-size:1.25rem;font-weight:700;color:var(--text)}
.logo-text span{color:var(--primary)}
.nav-main{display:flex;gap:28px;list-style:none}
.nav-main a{color:var(--text);font-weight:500;font-size:.95rem}
.nav-main a:hover,.nav-main a.active{color:var(--primary)}
.menu-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}

/* Hero */
.hero{background:linear-gradient(135deg,#1a8cff 0%,#4db8ff 50%,#7dd3fc 100%);color:#fff;padding:60px 20px 80px;text-align:center}
.hero h1{font-size:2rem;margin-bottom:16px;line-height:1.35}
.hero-desc{font-size:1.05rem;opacity:.95;max-width:720px;margin:0 auto 28px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 32px;border-radius:50px;font-weight:600;font-size:1rem;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:#fff;color:var(--primary);box-shadow:0 4px 20px rgba(0,0,0,.15)}
.btn-outline{border:2px solid #fff;color:#fff;background:transparent}
.btn-outline:hover{background:rgba(255,255,255,.15)}

/* Sections */
section{padding:56px 20px}
.section-title{text-align:center;margin-bottom:12px;font-size:1.75rem;color:var(--text)}
.section-subtitle{text-align:center;color:var(--text-muted);margin-bottom:40px;max-width:640px;margin-left:auto;margin-right:auto}

/* Feature grid */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px}
.feature-card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s}
.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:1.15rem;margin-bottom:8px;color:var(--text)}
.feature-card p{color:var(--text-muted);font-size:.92rem}

/* Content blocks */
.content-block{background:var(--card);border-radius:var(--radius);padding:36px;margin-bottom:32px;box-shadow:var(--shadow)}
.content-block h2{font-size:1.4rem;margin-bottom:16px;color:var(--primary);padding-bottom:10px;border-bottom:2px solid var(--border)}
.content-block h3{font-size:1.15rem;margin:24px 0 12px;color:var(--text)}
.content-block p{margin-bottom:14px;color:var(--text-muted)}
.content-block ul,.content-block ol{margin:12px 0 16px 24px;color:var(--text-muted)}
.content-block li{margin-bottom:8px}
.content-img{margin:24px 0;border-radius:var(--radius);box-shadow:var(--shadow)}
.content-img figcaption{text-align:center;font-size:.85rem;color:var(--text-muted);margin-top:8px}

/* Two column layout */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.two-col img{border-radius:var(--radius);box-shadow:var(--shadow)}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;margin-top:32px}
.step{background:var(--card);padding:28px;border-radius:var(--radius);text-align:center;box-shadow:var(--shadow)}
.step-num{width:48px;height:48px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.25rem;font-weight:700;margin:0 auto 16px}

/* FAQ */
.faq-item{border-bottom:1px solid var(--border);padding:20px 0}
.faq-item h3{font-size:1.05rem;margin-bottom:8px;color:var(--text)}
.faq-item p{color:var(--text-muted);font-size:.95rem}

/* Internal links */
.link-box{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.link-box a{background:#eef6ff;padding:8px 16px;border-radius:20px;font-size:.88rem}

/* Page header */
.page-header{background:linear-gradient(135deg,var(--primary),#4db8ff);color:#fff;padding:48px 20px;text-align:center}
.page-header h1{font-size:1.75rem;margin-bottom:8px}
.page-header p{opacity:.9}

/* Legal pages */
.legal-content{max-width:860px;margin:0 auto;padding:40px 20px 60px}
.legal-content h2{font-size:1.25rem;margin:32px 0 12px;color:var(--text)}
.legal-content p,.legal-content li{color:var(--text-muted);margin-bottom:12px}
.legal-content ul{margin-left:24px}

/* 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-muted);margin-bottom:24px}

/* Footer */
.site-footer{background:#1a1a2e;color:#a0aec0;padding:48px 20px 24px;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;max-width:var(--max);margin:0 auto 32px}
.footer-grid h4{color:#fff;margin-bottom:16px;font-size:1rem}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:10px}
.footer-grid a{color:#a0aec0;font-size:.9rem}
.footer-grid a:hover{color:#fff}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid #2d3748;font-size:.85rem;max-width:var(--max);margin:0 auto}

/* Breadcrumb */
.breadcrumb{padding:16px 20px;font-size:.88rem;color:var(--text-muted);max-width:var(--max);margin:0 auto}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}

/* Responsive */
@media(max-width:768px){
  .site-header{position:fixed;top:0;left:0;right:0;z-index:1000}
  body{padding-top:var(--header-h)}
  .header-inner{position:relative}
  .menu-toggle{display:block}
  .nav-main{display:none;position:fixed;top:var(--header-h);left:0;right:0;background:var(--card);flex-direction:column;padding:16px 20px;gap:12px;box-shadow:0 8px 24px rgba(0,0,0,.1);border-top:1px solid var(--border);z-index:999;max-height:calc(100vh - var(--header-h));overflow-y:auto}
  .nav-main.open{display:flex}
  .nav-main a{display:block;padding:10px 0;font-size:1rem}
  section,[id]{scroll-margin-top:calc(var(--header-h) + 8px)}
  .hero h1{font-size:1.5rem}
  .hero{padding:40px 20px 60px}
  .two-col{grid-template-columns:1fr}
  section{padding:40px 16px}
  .content-block{padding:24px 20px}
  .section-title{font-size:1.4rem}
}