:root{
  --bg:#f6f8fb;
  --card:#ffffff;
  --line:#d9e2ec;
  --text:#1f2937;
  --muted:#5b6472;
  --brand:#123d82;
  --brand-2:#1d4ed8;
  --soft:#eaf1ff;
  --ok:#0f766e;
  --shadow:0 10px 30px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.8}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1200px,calc(100% - 32px));margin:0 auto}
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 0}
.logo{font-weight:800;font-size:22px;color:var(--brand);letter-spacing:.5px}
.logo small{display:block;font-size:12px;color:var(--muted);font-weight:600}
.menu{display:flex;flex-wrap:wrap;gap:14px;font-size:14px}
.menu a{padding:8px 10px;border-radius:999px}
.menu a.active,.menu a:hover{background:var(--soft);text-decoration:none}
.hero{background:linear-gradient(135deg,#0b1f45 0%,#123d82 52%,#2b63d9 100%);color:#fff;padding:72px 0 54px}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:start}
.hero h1{font-size:42px;line-height:1.2;margin:0 0 16px}
.hero p{font-size:18px;opacity:.96;margin:0 0 16px}
.badges{display:flex;flex-wrap:wrap;gap:10px}
.badge{display:inline-block;padding:8px 12px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.12);border-radius:999px;font-size:14px}
.panel{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);border-radius:18px;padding:18px 18px 16px}
.panel strong{display:block;margin-bottom:8px;font-size:17px}
main section{padding:42px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.section-head h2{margin:0;font-size:30px;color:var(--brand)}
.section-head p{margin:8px 0 0;color:var(--muted)}
.card,.article-card,.metric,.qa-card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.grid-2{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
.card{padding:22px}
.card h3{margin:0 0 12px;font-size:20px;color:var(--brand)}
.metric-wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.metric{padding:18px}
.metric strong{display:block;font-size:28px;color:var(--brand)}
.metric span{font-size:14px;color:var(--muted)}
.module-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.module-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow)}
.module-card h3{margin:0 0 8px;color:var(--brand)}
.module-card p{margin:0 0 14px;color:var(--muted)}
.post-list{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.post-list li{padding-bottom:10px;border-bottom:1px dashed var(--line)}
.post-list li:last-child{border-bottom:0;padding-bottom:0}
.post-list a{font-weight:700;color:var(--text)}
.post-meta{display:block;font-size:12px;color:var(--muted);margin-top:4px}
.cta-link{display:inline-flex;align-items:center;gap:8px;font-weight:700}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px}
.article-card{padding:28px}
.article-card h1{font-size:36px;line-height:1.3;margin:0 0 10px;color:var(--brand)}
.lead{font-size:18px;color:#334155;margin:0 0 20px}
.article-meta{display:flex;gap:18px;flex-wrap:wrap;font-size:14px;color:var(--muted);padding-bottom:16px;border-bottom:1px solid var(--line);margin-bottom:20px}
.article-card h2{margin:26px 0 10px;font-size:24px;color:var(--brand)}
.article-card p{margin:0 0 14px}
.qa-list{display:grid;gap:12px;margin-top:18px}
.qa-card{padding:16px 18px}
.qa-card strong{display:block;margin-bottom:6px;color:var(--brand)}
.sidebar{display:grid;gap:16px}
.side-box{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.side-box h3{margin:0 0 10px;color:var(--brand);font-size:18px}
.side-box ul{margin:0;padding-left:18px}
.side-box li{margin-bottom:10px}
footer{padding:36px 0 50px;background:#0f172a;color:#dbe4f0;margin-top:24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:18px}
footer h4{margin:0 0 12px;color:#fff}
footer p, footer a{color:#dbe4f0;font-size:14px}
.note{background:#f8fbff;border-left:4px solid var(--brand-2);padding:14px 16px;border-radius:10px}
.code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#eff6ff;padding:2px 6px;border-radius:6px}
@media (max-width:960px){
  .hero-grid,.grid-2,.article-layout,.footer-grid,.module-grid,.metric-wrap,.grid-3{grid-template-columns:1fr}
  .hero h1{font-size:34px}
}
@media (max-width:720px){
  .menu{display:none}
  .hero{padding:56px 0 40px}
  .hero h1{font-size:30px}
  .article-card h1{font-size:28px}
}