:root{--brand:#1a56db;--brand-dark:#12429f;--ink:#1a2233;--muted:#5b6472;--line:#e5e9f0;--bg:#ffffff;--bg-soft:#f5f7fb;--radius:10px;--shadow:0 2px 12px rgba(20,40,80,0.08)}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font-family:system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.7}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1080px;margin:0 auto;padding:0 24px}.site-nav{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.site-nav-inner{display:flex;align-items:center;justify-content:space-between;height:60px}.brand{font-weight:700;font-size:18px;color:var(--ink)}.brand em{color:var(--brand);font-style:normal}.nav-links{display:flex;gap:24px;align-items:center}.nav-links a{color:var(--ink);font-size:14px}.nav-links a:hover{color:var(--brand);text-decoration:none}.btn{display:inline-block;padding:8px 18px;border-radius:8px;font-size:14px}.btn-primary{background:var(--brand);color:#fff!important}.btn-primary:hover{background:var(--brand-dark);text-decoration:none}.btn-outline{border:1px solid var(--line);color:var(--ink)!important}.hero{background:linear-gradient(135deg,#eef3ff,#f7f9ff 60%,#ffffff);padding:88px 0 64px}.hero h1{font-size:40px;line-height:1.25;margin:0 0 16px}.hero p.lead{font-size:17px;color:var(--muted);max-width:640px;margin:0 0 28px}.hero-actions{display:flex;gap:12px}.hero-stats{display:flex;gap:48px;margin-top:48px;flex-wrap:wrap}.hero-stats b{font-size:26px;color:var(--brand);display:block}.hero-stats span{color:var(--muted);font-size:13px}.section{padding:64px 0}.section-title{font-size:26px;margin:0 0 8px}.section-sub{color:var(--muted);margin:0 0 36px}.grid{display:grid;grid-gap:20px;gap:20px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}@media (max-width:800px){.grid-2,.grid-3{grid-template-columns:1fr}.hero h1{font-size:30px}}.card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff;box-shadow:var(--shadow)}.card h3{margin:0 0 8px;font-size:17px}.card p{margin:0;color:var(--muted);font-size:14px}.tag{display:inline-block;padding:2px 10px;border-radius:20px;background:var(--bg-soft);color:var(--brand);font-size:12px;margin-bottom:10px}.article-meta{color:var(--muted);font-size:13px}.article-body{max-width:720px;margin:32px auto}.article-body h1{font-size:30px;line-height:1.35}.article-body h2{font-size:22px;margin-top:36px}.article-body p{margin:16px 0}.article-body blockquote{border-left:4px solid var(--brand);margin:20px 0;padding:8px 16px;background:var(--bg-soft)}.article-body code{background:var(--bg-soft);padding:2px 6px;border-radius:4px;font-size:13px}.site-footer{border-top:1px solid var(--line);padding:36px 0;color:var(--muted);font-size:13px}.footer-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:24px;gap:24px;margin-bottom:24px}@media (max-width:800px){.footer-grid{grid-template-columns:1fr}}