/* ===== 基础变量与重置 ===== */
:root{
  --primary:#0a84ff;
  --primary-dark:#0066d6;
  --accent:#00d4ff;
  --bg:#0d1117;
  --bg-soft:#161b22;
  --bg-card:#1c2330;
  --text:#e6edf3;
  --text-soft:#9da7b3;
  --line:#2a323d;
  --radius:14px;
  --maxw:1160px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.8;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{line-height:1.4}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 26px;border-radius:999px;font-size:15px;font-weight:600;transition:.18s;cursor:pointer;border:1px solid transparent}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 8px 22px rgba(10,132,255,.35)}
.btn-line{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-line:hover{background:rgba(10,132,255,.12)}

/* ===== 顶部导航 ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(13,17,23,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:21px;color:#fff}
.brand-dot{width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}
.top-nav{display:flex;align-items:center;gap:24px}
.top-nav a{color:var(--text-soft);font-size:15px;font-weight:500}
.top-nav a:hover,.top-nav a.active{color:var(--accent)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--text);cursor:pointer}

/* ===== Hero ===== */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(0,212,255,.18),transparent),linear-gradient(180deg,#0d1117,#10151d);padding:72px 0 60px;border-bottom:1px solid var(--line)}
.hero h1{font-size:42px;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,#fff,#9fd8ff);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.lead{font-size:18px;color:var(--text-soft);max-width:640px;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;list-style:none}
.hero-tags li{font-size:13px;color:var(--accent);background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.25);padding:6px 14px;border-radius:999px}

/* ===== 区块 ===== */
.section{padding:64px 0}
.section-alt{background:var(--bg-soft)}
.sec-title{font-size:30px;font-weight:800;text-align:center;margin-bottom:10px}
.sec-lead{text-align:center;color:var(--text-soft);max-width:720px;margin:0 auto 38px;font-size:16px}

/* ===== 卡片网格 ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.2s}
.card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:0 12px 30px rgba(0,132,255,.12)}
.card h3{font-size:19px;margin-bottom:10px;color:#fff}
.card p{color:var(--text-soft);font-size:14.5px}
.card .more{display:inline-block;margin-top:12px;color:var(--accent);font-size:14px;font-weight:600}

/* ===== 文章/正文 ===== */
.article{max-width:860px;margin:0 auto}
.article h2{font-size:26px;margin:36px 0 14px;color:#fff;border-left:4px solid var(--accent);padding-left:12px}
.article h3{font-size:20px;margin:26px 0 10px;color:#cfe8ff}
.article p{margin-bottom:16px;color:var(--text-soft)}
.article ul,.article ol{margin:0 0 18px 22px;color:var(--text-soft)}
.article li{margin-bottom:8px}
.article code{background:var(--bg-soft);padding:2px 8px;border-radius:6px;color:var(--accent);font-size:14px}
.article pre{background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:16px;overflow:auto;margin-bottom:18px}
.breadcrumb{color:var(--text-soft);font-size:14px;margin-bottom:20px}
.breadcrumb a{color:var(--accent)}

/* ===== 博客卡片 ===== */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.blog-card{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.blog-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:0 14px 32px rgba(0,132,255,.14)}
.blog-thumb{height:160px;background:linear-gradient(135deg,#232d3f,#1a2231);display:flex;align-items:flex-start;justify-content:flex-start;padding:18px;position:relative}
.blog-tag{display:inline-block;font-size:12px;font-weight:600;color:var(--primary);background:rgba(10,132,255,.12);border:1px solid rgba(10,132,255,.25);padding:5px 12px;border-radius:999px}
.blog-body{padding:20px;flex:1;display:flex;flex-direction:column}
.blog-body h3{font-size:18px;margin-bottom:10px;color:#fff;line-height:1.45}
.blog-body p{color:var(--text-soft);font-size:14px;line-height:1.65;margin-bottom:16px;flex:1}
.blog-meta{display:flex;align-items:center;justify-content:space-between;margin-top:auto}
.blog-date{font-size:13px;color:var(--text-soft);display:flex;align-items:center;gap:6px}
.blog-read{display:inline-flex;align-items:center;gap:4px;font-size:13px;font-weight:600;color:#fff;background:var(--primary);padding:8px 16px;border-radius:999px;transition:.18s}
.blog-read:hover{background:var(--primary-dark);transform:translateY(-1px)}

/* ===== 下载页 ===== */
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:900px;margin:0 auto}
.dl-card{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;text-align:center}
.dl-card h3{font-size:20px;margin-bottom:8px;color:#fff}
.dl-card p{color:var(--text-soft);font-size:14px;margin-bottom:16px}

/* ===== FAQ ===== */
.faq-item{background:var(--bg-card);border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin-bottom:14px}
.faq-item h3{font-size:17px;color:#fff;margin-bottom:8px}
.faq-item p{color:var(--text-soft);font-size:14.5px}

/* ===== 对比表 ===== */
.compare-table{width:100%;border-collapse:collapse;margin-top:10px;background:var(--bg-card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.compare-table th,.compare-table td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px}
.compare-table th{background:var(--bg-soft);color:#fff;font-weight:600}
.compare-table td{color:var(--text-soft)}
.compare-table tr:last-child td{border-bottom:none}

/* ===== 页脚 ===== */
.site-footer{background:#0a0e14;border-top:1px solid var(--line);padding:30px 0;color:var(--text-soft);font-size:14px}
.footer-inner{text-align:center;line-height:2}
.footer-inner a{color:var(--accent)}
.footer-inner .copy{margin-top:8px;opacity:.8}

/* ===== 响应式 ===== */
@media (max-width:900px){
  .grid-3,.grid-2,.dl-grid,.blog-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:34px}
}
@media (max-width:600px){
  .top-nav{display:none;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:var(--bg);padding:12px 20px;border-bottom:1px solid var(--line);gap:0}
  .top-nav.open{display:flex}
  .top-nav a{padding:12px 0;border-bottom:1px solid var(--line);width:100%}
  .nav-toggle{display:block}
  .grid-3,.grid-2,.dl-grid,.blog-grid{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .sec-title{font-size:25px}
}