*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#06b6d4;
  --bg:#0f172a;
  --bg-card:#1e293b;
  --bg-light:#f8fafc;
  --text:#e2e8f0;
  --text-dark:#1e293b;
  --text-muted:#94a3b8;
  --border:#334155;
  --gradient:linear-gradient(135deg,#2563eb 0%,#06b6d4 100%);
  --shadow:0 4px 24px rgba(0,0,0,.25);
  --radius:12px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7;color:var(--text-dark);background:var(--bg-light)}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--bg);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 0}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-size:1.35rem;font-weight:700}
.logo span{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-links{display:flex;gap:28px;list-style:none}
.nav-links a{color:var(--text-muted);font-size:.95rem}
.nav-links a:hover,.nav-links a.active{color:#fff}
.btn-download-nav{background:var(--gradient);color:#fff!important;padding:8px 22px;border-radius:8px;font-weight:600}
.btn-download-nav:hover{opacity:.9;color:#fff!important}

/* Hero */
.hero{background:var(--bg);color:#fff;padding:80px 0 100px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(37,99,235,.3) 0%,transparent 70%);border-radius:50%}
.hero-badge{display:inline-block;background:rgba(37,99,235,.2);border:1px solid rgba(37,99,235,.4);color:var(--accent);padding:6px 16px;border-radius:20px;font-size:.85rem;margin-bottom:20px}
.hero h1{font-size:2.6rem;line-height:1.3;margin-bottom:20px;font-weight:800}
.hero h1 em{font-style:normal;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:1.1rem;color:var(--text-muted);max-width:600px;margin-bottom:32px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary{background:var(--gradient);color:#fff;padding:14px 32px;border-radius:10px;font-weight:600;font-size:1rem;border:none;cursor:pointer;display:inline-block}
.btn-primary:hover{opacity:.92;color:#fff;transform:translateY(-1px)}
.btn-outline{border:2px solid var(--border);color:#fff;padding:12px 30px;border-radius:10px;font-weight:600;display:inline-block}
.btn-outline:hover{border-color:var(--primary);color:#fff}

/* Sections */
section{padding:72px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2rem;margin-bottom:12px;color:var(--text-dark)}
.section-title p{color:#64748b;font-size:1.05rem}

/* Features Grid */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.feature-card{background:#fff;border-radius:var(--radius);padding:32px;box-shadow:0 2px 12px rgba(0,0,0,.06);border:1px solid #e2e8f0;transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.feature-icon{font-size:2.2rem;margin-bottom:16px}
.feature-card h3{font-size:1.15rem;margin-bottom:10px;color:var(--text-dark)}
.feature-card p{color:#64748b;font-size:.95rem}

/* Stats */
.stats-bar{background:var(--bg);padding:48px 0}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px;text-align:center}
.stat-item .num{font-size:2.2rem;font-weight:800;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-item .label{color:var(--text-muted);font-size:.9rem;margin-top:4px}

/* Scenarios */
.scenarios-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.scenario-item{background:#fff;border-radius:var(--radius);padding:24px;text-align:center;border:1px solid #e2e8f0}
.scenario-item .icon{font-size:2rem;margin-bottom:12px}
.scenario-item h4{font-size:1rem;margin-bottom:8px}
.scenario-item p{color:#64748b;font-size:.88rem}

/* Reviews */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.review-card{background:#fff;border-radius:var(--radius);padding:28px;border:1px solid #e2e8f0}
.review-stars{color:#f59e0b;font-size:1.1rem;margin-bottom:12px}
.review-text{color:#475569;font-style:italic;margin-bottom:16px;line-height:1.8}
.review-author{color:#94a3b8;font-size:.88rem}

/* Compare */
.compare-table{max-width:700px;margin:0 auto;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.compare-row{display:grid;grid-template-columns:1fr 1fr 1fr;padding:16px 24px;border-bottom:1px solid #e2e8f0;align-items:center}
.compare-row:first-child{background:var(--bg);color:#fff;font-weight:600}
.compare-row .highlight{color:var(--primary);font-weight:700}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:#fff;border-radius:var(--radius);margin-bottom:12px;border:1px solid #e2e8f0;overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--primary)}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;color:#64748b}
.faq-item.open .faq-a{max-height:300px;padding:0 24px 18px}

/* CTA */
.cta-section{background:var(--gradient);color:#fff;text-align:center;padding:64px 20px;border-radius:var(--radius);margin:0 20px}
.cta-section h3{font-size:1.6rem;margin-bottom:12px}
.cta-section p{opacity:.9;margin-bottom:24px}

/* Footer */
.site-footer{background:var(--bg);color:var(--text-muted);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer-grid h4{color:#fff;margin-bottom:16px;font-size:1rem}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px}
.footer-grid a{color:var(--text-muted);font-size:.9rem}
.footer-grid a:hover{color:#fff}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid var(--border);font-size:.85rem}

/* Download Page */
.download-hero{text-align:center;padding:60px 0 40px}
.download-hero h1{font-size:2.2rem;margin-bottom:16px}
.download-hero p{color:#64748b;max-width:560px;margin:0 auto 32px}
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;max-width:900px;margin:0 auto}
.platform-card{background:#fff;border-radius:var(--radius);padding:36px 24px;text-align:center;border:1px solid #e2e8f0;transition:transform .2s}
.platform-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.platform-card .plat-icon{font-size:3rem;margin-bottom:16px}
.platform-card h3{margin-bottom:8px}
.platform-card p{color:#64748b;font-size:.88rem;margin-bottom:20px}
.btn-dl{background:var(--gradient);color:#fff;padding:12px 28px;border-radius:8px;font-weight:600;display:inline-block}
.btn-dl:hover{color:#fff;opacity:.92}
.download-steps{max-width:700px;margin:48px auto 0}
.download-steps h2{text-align:center;margin-bottom:32px}
.step-item{display:flex;gap:20px;margin-bottom:24px;align-items:flex-start}
.step-num{background:var(--primary);color:#fff;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
.step-content h4{margin-bottom:6px}
.step-content p{color:#64748b;font-size:.92rem}

/* Article Pages */
.article-hero{background:var(--bg);color:#fff;padding:48px 0}
.article-hero h1{font-size:2rem;margin-bottom:12px}
.article-meta{color:var(--text-muted);font-size:.9rem}
.article-body{max-width:760px;margin:0 auto;padding:48px 20px}
.article-body h2{font-size:1.4rem;margin:32px 0 16px;color:var(--text-dark)}
.article-body h3{font-size:1.15rem;margin:24px 0 12px}
.article-body p{margin-bottom:16px;color:#475569;line-height:1.9}
.article-body ul,.article-body ol{margin:0 0 16px 24px;color:#475569}
.article-body li{margin-bottom:8px}
.article-body blockquote{border-left:4px solid var(--primary);padding:12px 20px;background:#f1f5f9;margin:20px 0;color:#475569}
.article-list-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;padding:48px 0}
.article-card{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid #e2e8f0;transition:transform .2s}
.article-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.article-card-body{padding:24px}
.article-card-body h3{margin-bottom:10px;font-size:1.1rem}
.article-card-body h3 a{color:var(--text-dark)}
.article-card-body p{color:#64748b;font-size:.92rem;margin-bottom:12px}
.article-card-body .date{color:#94a3b8;font-size:.82rem}
.article-update-badge{display:inline-block;background:#ecfdf5;color:#059669;padding:4px 10px;border-radius:4px;font-size:.78rem;margin-left:8px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.88rem;color:#94a3b8}
.breadcrumb a{color:var(--primary)}

/* Mobile */
.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg);flex-direction:column;padding:20px;gap:16px}
  .nav-links.open{display:flex}
  .menu-toggle{display:block}
  .hero h1{font-size:1.8rem}
  .hero{padding:48px 0 64px}
}