*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --primary-light:#3b82f6;
  --accent:#06b6d4;
  --bg-dark:#0f172a;
  --bg-card:#1e293b;
  --bg-section:#f8fafc;
  --text:#334155;
  --text-light:#64748b;
  --text-white:#f1f5f9;
  --border:#e2e8f0;
  --shadow:0 4px 24px rgba(15,23,42,.08);
  --radius:12px;
  --max-w:1200px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);line-height:1.7;background:#fff}
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-w);margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:700;color:var(--bg-dark)}
.logo-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:1rem}
.nav{display:flex;align-items:center;gap:32px}
.nav a{color:var(--text);font-weight:500;font-size:.95rem}
.nav a:hover,.nav a.active{color:var(--primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:50px;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:all .25s}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;box-shadow:0 4px 16px rgba(37,99,235,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(37,99,235,.4);color:#fff}
.btn-outline{background:transparent;border:2px solid var(--primary);color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.menu-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--bg-dark)}

/* Hero */
.hero{background:linear-gradient(135deg,#0f172a 0%,#1e3a5f 50%,#0f172a 100%);color:var(--text-white);padding:100px 0 80px;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,.15) 0%,transparent 70%);border-radius:50%}
.hero-content{position:relative;z-index:1;text-align:center;max-width:800px;margin:0 auto}
.hero h1{font-size:2.8rem;font-weight:800;line-height:1.2;margin-bottom:20px;background:linear-gradient(135deg,#fff,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1.15rem;color:#94a3b8;margin-bottom:36px;line-height:1.8}
.hero-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:48px 0 40px;text-align:left}
.hero-feature{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:20px 24px;display:flex;align-items:flex-start;gap:12px}
.hero-feature .icon{width:40px;height:40px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:1.1rem}
.hero-feature p{color:#cbd5e1;font-size:.92rem;margin:0}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* Sections */
.section{padding:80px 0}
.section-alt{background:var(--bg-section)}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2rem;font-weight:700;color:var(--bg-dark);margin-bottom:12px}
.section-title p{color:var(--text-light);max-width:600px;margin:0 auto;font-size:1.05rem}

/* Features Grid */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:28px}
.feature-card{background:#fff;border-radius:var(--radius);padding:32px 28px;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .3s,box-shadow .3s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(15,23,42,.12)}
.feature-icon{width:56px;height:56px;background:linear-gradient(135deg,rgba(37,99,235,.1),rgba(6,182,212,.1));border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:20px}
.feature-card h3{font-size:1.15rem;font-weight:700;color:var(--bg-dark);margin-bottom:10px}
.feature-card p{color:var(--text-light);font-size:.92rem}

/* Stats */
.stats-bar{background:linear-gradient(135deg,var(--primary),var(--primary-dark));padding:48px 0;color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px;text-align:center}
.stat-item h3{font-size:2.2rem;font-weight:800;margin-bottom:4px}
.stat-item p{font-size:.9rem;opacity:.85}

/* Reviews */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.review-card{background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);border:1px solid var(--border)}
.review-header{display:flex;align-items:center;gap:14px;margin-bottom:16px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-meta h4{font-size:.95rem;font-weight:600;color:var(--bg-dark)}
.review-meta span{font-size:.82rem;color:var(--text-light)}
.review-stars{color:#f59e0b;font-size:.9rem;margin-bottom:10px;letter-spacing:2px}
.review-card p{color:var(--text-light);font-size:.9rem}

/* Pricing */
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px;max-width:960px;margin:0 auto}
.price-card{background:#fff;border-radius:var(--radius);padding:36px 28px;text-align:center;box-shadow:var(--shadow);border:2px solid var(--border);position:relative;transition:transform .3s,border-color .3s}
.price-card.featured{border-color:var(--primary);transform:scale(1.03)}
.price-card.featured::before{content:"推荐";position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--primary);color:#fff;padding:4px 20px;border-radius:20px;font-size:.82rem;font-weight:600}
.price-card h3{font-size:1.1rem;font-weight:600;color:var(--bg-dark);margin-bottom:16px}
.price-amount{font-size:2.4rem;font-weight:800;color:var(--primary);margin-bottom:8px}
.price-amount small{font-size:.9rem;font-weight:400;color:var(--text-light)}
.price-save{color:#10b981;font-size:.85rem;font-weight:600;margin-bottom:24px}
.price-card .btn{width:100%}

/* Articles */
.articles-list{display:grid;gap:24px;max-width:900px;margin:0 auto}
.article-item{display:flex;gap:24px;background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s}
.article-item:hover{transform:translateX(4px)}
.article-date{font-size:.82rem;color:var(--text-light);white-space:nowrap;padding-top:4px;min-width:100px}
.article-body h3{font-size:1.1rem;font-weight:600;margin-bottom:8px}
.article-body h3 a{color:var(--bg-dark)}
.article-body h3 a:hover{color:var(--primary)}
.article-body p{color:var(--text-light);font-size:.9rem;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.read-more{font-size:.88rem;font-weight:600;color:var(--primary)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden;background:#fff}
.faq-question{width:100%;padding:20px 24px;background:none;border:none;text-align:left;font-size:1rem;font-weight:600;color:var(--bg-dark);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-question::after{content:"+";font-size:1.3rem;color:var(--primary);transition:transform .3s;flex-shrink:0}
.faq-item.open .faq-question::after{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s ease}
.faq-item.open .faq-answer{max-height:500px;padding:0 24px 20px}
.faq-answer p{color:var(--text-light);font-size:.92rem}

/* CTA */
.cta-section{background:linear-gradient(135deg,#0f172a,#1e3a5f);padding:80px 0;text-align:center;color:var(--text-white)}
.cta-section h2{font-size:2rem;font-weight:700;margin-bottom:16px}
.cta-section p{color:#94a3b8;margin-bottom:32px;font-size:1.05rem}

/* Download Page */
.download-hero{padding:80px 0 60px;background:var(--bg-section);text-align:center}
.download-hero h1{font-size:2.2rem;font-weight:700;color:var(--bg-dark);margin-bottom:16px}
.download-hero p{color:var(--text-light);max-width:600px;margin:0 auto 40px}
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;max-width:900px;margin:0 auto}
.download-card{background:#fff;border-radius:var(--radius);padding:36px 24px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .3s}
.download-card:hover{transform:translateY(-4px)}
.download-card .platform-icon{font-size:2.8rem;margin-bottom:16px}
.download-card h3{font-size:1.1rem;font-weight:600;margin-bottom:8px;color:var(--bg-dark)}
.download-card p{font-size:.85rem;color:var(--text-light);margin-bottom:20px}
.download-card .btn{width:100%}
.download-note{max-width:700px;margin:40px auto 0;padding:20px 24px;background:#fff;border-radius:var(--radius);border-left:4px solid var(--primary);font-size:.9rem;color:var(--text-light)}

/* Article Page */
.article-page{padding:60px 0 80px}
.article-header{max-width:760px;margin:0 auto 40px;text-align:center}
.article-header .meta{color:var(--text-light);font-size:.88rem;margin-bottom:16px}
.article-header h1{font-size:2rem;font-weight:700;color:var(--bg-dark);line-height:1.4;margin-bottom:16px}
.article-header .summary{color:var(--text-light);font-size:1.05rem}
.article-content{max-width:760px;margin:0 auto;font-size:1rem;line-height:1.9;color:var(--text)}
.article-content h2{font-size:1.4rem;font-weight:700;color:var(--bg-dark);margin:36px 0 16px}
.article-content h3{font-size:1.15rem;font-weight:600;color:var(--bg-dark);margin:28px 0 12px}
.article-content p{margin-bottom:16px}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:var(--text-light)}
.article-content li{margin-bottom:8px}
.article-content blockquote{border-left:4px solid var(--primary);padding:16px 20px;background:var(--bg-section);border-radius:0 var(--radius) var(--radius) 0;margin:24px 0;color:var(--text-light);font-size:.95rem}
.breadcrumb{padding:16px 0;font-size:.88rem;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* Footer */
.site-footer{background:var(--bg-dark);color:#94a3b8;padding:60px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .logo{color:#fff;margin-bottom:16px}
.footer-brand p{font-size:.88rem;line-height:1.7}
.footer-col h4{color:#fff;font-size:.95rem;font-weight:600;margin-bottom:16px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:#94a3b8;font-size:.88rem}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;text-align:center;font-size:.82rem}

/* Responsive */
@media(max-width:768px){
  .menu-toggle{display:block}
  .nav{position:fixed;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:24px;gap:20px;border-bottom:1px solid var(--border);transform:translateY(-120%);opacity:0;transition:all .3s;pointer-events:none}
  .nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .hero h1{font-size:2rem}
  .hero-features{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .article-item{flex-direction:column;gap:8px}
  .price-card.featured{transform:none}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .hero{padding:72px 0 60px}
  .section{padding:56px 0}
}