*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a73e8;
  --primary-dark:#0d47a1;
  --accent:#00c853;
  --bg:#0a0e17;
  --bg-card:#111827;
  --bg-light:#1a2234;
  --text:#e8eaed;
  --text-muted:#9aa0a6;
  --border:#2d3748;
  --gradient:linear-gradient(135deg,#1a73e8 0%,#00c853 100%);
  --shadow:0 4px 24px rgba(0,0,0,.4);
  --radius:12px;
}
html{scroll-behavior:smooth}
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:1.7;font-size:16px}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.header{background:rgba(10,14,23,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:700;color:var(--text)}
.logo img{width:36px;height:36px}
.nav{display:flex;gap:28px;list-style:none}
.nav a{color:var(--text-muted);font-size:15px}
.nav a:hover,.nav a.active{color:var(--text)}
.header-btns{display:flex;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;border:none;transition:all .2s}
.btn-primary{background:var(--gradient);color:#fff}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(26,115,232,.4);color:#fff}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-lg{padding:14px 36px;font-size:16px}

/* Hero */
.hero{padding:80px 0 60px;background:radial-gradient(ellipse at 50% 0%,rgba(26,115,232,.15) 0%,transparent 60%)}
.hero-content{text-align:center;max-width:800px;margin:0 auto}
.hero h1{font-size:48px;font-weight:800;line-height:1.2;margin-bottom:20px;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:18px;color:var(--text-muted);margin-bottom:12px}
.hero-meta{font-size:14px;color:var(--text-muted);margin-bottom:32px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* Section */
.section{padding:70px 0}
.section-title{text-align:center;margin-bottom:50px}
.section-title h2{font-size:32px;font-weight:700;margin-bottom:12px}
.section-title p{color:var(--text-muted);font-size:16px;max-width:600px;margin:0 auto}

/* Cards Grid */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card-icon{width:48px;height:48px;border-radius:12px;background:var(--gradient);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.card h3{font-size:20px;margin-bottom:12px}
.card p{color:var(--text-muted);font-size:14px;margin-bottom:16px}
.card ul{list-style:none}
.card li{padding:6px 0;font-size:14px;color:var(--text-muted);position:relative;padding-left:20px}
.card li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:700}

/* Download Cards */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:30px}
.download-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:40px;text-align:center}
.download-card .platform-icon{font-size:48px;margin-bottom:16px}
.download-card h3{font-size:22px;margin-bottom:8px}
.download-card .version{color:var(--text-muted);font-size:14px;margin-bottom:20px}
.download-card ul{text-align:left;margin-bottom:24px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:30px}
.step-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;position:relative}
.step-num{font-size:48px;font-weight:800;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}
.step-card h3{font-size:20px;margin-bottom:12px}
.step-card ul{list-style:none}
.step-card li{padding:5px 0;font-size:14px;color:var(--text-muted);padding-left:18px;position:relative}
.step-card li::before{content:"•";position:absolute;left:0;color:var(--primary)}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;text-align:center}
.stat-item{padding:30px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius)}
.stat-num{font-size:36px;font-weight:800;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-label{color:var(--text-muted);font-size:14px;margin-top:8px}

/* Article */
.article-hero{padding:60px 0 40px;background:var(--bg-light)}
.article-hero h1{font-size:36px;margin-bottom:16px}
.article-meta{color:var(--text-muted);font-size:14px;display:flex;gap:20px;flex-wrap:wrap}
.article-body{max-width:800px;margin:0 auto;padding:40px 20px}
.article-body h2{font-size:24px;margin:32px 0 16px;color:var(--text)}
.article-body h3{font-size:20px;margin:24px 0 12px}
.article-body p{margin-bottom:16px;color:var(--text-muted);line-height:1.8}
.article-body ul,.article-body ol{margin:16px 0 16px 24px;color:var(--text-muted)}
.article-body li{margin-bottom:8px}
.article-nav{display:flex;justify-content:space-between;padding:30px 0;border-top:1px solid var(--border);margin-top:40px;flex-wrap:wrap;gap:16px}

/* Article List */
.article-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.article-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .2s}
.article-item:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.article-item-content{padding:24px}
.article-item h3{font-size:18px;margin-bottom:10px}
.article-item h3 a{color:var(--text)}
.article-item h3 a:hover{color:var(--primary)}
.article-item p{color:var(--text-muted);font-size:14px;margin-bottom:12px}
.article-item .date{font-size:13px;color:var(--text-muted)}
.article-tag{display:inline-block;padding:4px 12px;background:rgba(26,115,232,.15);color:var(--primary);border-radius:20px;font-size:12px;margin-bottom:12px}

/* Footer */
.footer{background:var(--bg-card);border-top:1px solid var(--border);padding:50px 0 30px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:30px}
.footer h4{font-size:16px;margin-bottom:16px;color:var(--text)}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer a{color:var(--text-muted);font-size:14px}
.footer a:hover{color:var(--primary)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid var(--border);color:var(--text-muted);font-size:13px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:14px;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb span{margin:0 8px}

/* Mobile */
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}
@media(max-width:768px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg-card);flex-direction:column;padding:20px;border-bottom:1px solid var(--border)}
  .nav.open{display:flex}
  .menu-toggle{display:block}
  .hero h1{font-size:32px}
  .header-btns{display:none}
}