:root{
  --blue:#1f5fbf; --blue-d:#16407f; --ink:#1c2733; --muted:#6b7a8d;
  --bg:#f5f8fc; --card:#fff; --line:#e2e9f2; --accent:#e8f1ff;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
.wrap{max-width:960px;margin:0 auto;padding:0 18px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}

.site-header{background:linear-gradient(120deg,var(--blue-d),var(--blue));color:#fff;
  position:sticky;top:0;z-index:10;box-shadow:0 2px 10px rgba(0,0,0,.12)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{font-size:22px;font-weight:800;color:#fff;letter-spacing:.5px}
.brand span{color:#9fd0ff}
.nav{display:flex;gap:18px;flex-wrap:wrap}
.nav a{color:#dbe9ff;font-size:15px;padding:4px 2px}
.nav a.active{color:#fff;border-bottom:2px solid #9fd0ff}
.nav a:hover{color:#fff;text-decoration:none}

.hero{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:34px 28px;margin:26px 0}
.hero h1{margin:0 0 12px;font-size:28px;color:var(--blue-d)}
.hero p{margin:8px 0}
.muted{color:var(--muted);font-size:14px}

.block{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:22px 26px;margin:22px 0}
.block-head{display:flex;align-items:center;justify-content:space-between;
  border-bottom:2px solid var(--accent);padding-bottom:10px;margin-bottom:14px}
.block-head h2{margin:0;font-size:21px;color:var(--blue-d)}
.more{font-size:14px;white-space:nowrap}

.page-title{color:var(--blue-d);margin:8px 0 18px;font-size:26px}

.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;
  overflow:hidden;color:inherit;transition:transform .12s,box-shadow .12s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(31,95,191,.15);text-decoration:none}
.card img{width:100%;height:140px;object-fit:cover;display:block;background:#dfe9f7}
.card-body{padding:12px 14px}
.card-body h3{margin:0;font-size:16px;color:var(--ink);line-height:1.4}

.prose{max-width:100%}
.prose h1{font-size:26px;color:var(--blue-d);margin:18px 0 12px}
.prose h2,.radar-h2{font-size:21px;color:var(--blue-d);margin:26px 0 10px;
  border-left:4px solid var(--blue);padding-left:10px}
.prose h3,.radar-h3{font-size:17px;color:#223;margin:16px 0 6px}
.prose p{margin:10px 0}
.prose blockquote,.radar blockquote{background:var(--accent);border-left:4px solid var(--blue);
  margin:14px 0;padding:10px 14px;border-radius:8px;color:#334}
.prose ul,.radar-list,.prose ol{margin:8px 0;padding-left:22px}
.prose li,.radar-list li{margin:5px 0}
.prose code,.radar code{background:#eef3fa;border:1px solid var(--line);border-radius:5px;
  padding:1px 6px;font-size:13px;color:#0b4f9c}
.prose hr,.radar hr{border:none;border-top:1px dashed var(--line);margin:22px 0}
.radar .prose p{color:var(--muted);font-size:14px}

.article{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:0 0 10px}
.article-cover{width:100%;max-height:340px;object-fit:cover;display:block;border-radius:14px 14px 0 0;background:#dfe9f7}
.article h1{padding:20px 26px 0;margin:0}
.article .prose,.article>h1+.prose{padding:0 26px}
.article img.article-img{display:block;max-width:100%;margin:14px auto;border-radius:10px}
.article blockquote{margin:14px 26px}

.site-footer{background:#0f1f38;color:#aebfd6;margin-top:40px;padding:22px 0;font-size:13px}
.site-footer .muted{color:#7f93b5}
.site-footer p{margin:4px 0}

/* 联系页 · 公众号二维码 */
.contact-block{max-width:420px;margin:30px auto;text-align:center}
.qr-wrap{background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:28px 22px;box-shadow:0 4px 18px rgba(31,95,191,.08)}
.qr-img{width:260px;max-width:80%;height:auto;display:block;margin:0 auto 14px;
  border-radius:10px;background:#fff}
.qr-cap{font-size:18px;font-weight:700;color:var(--blue-d);margin:6px 0 4px}
.qr-wrap .muted{margin:2px 0}

@media(max-width:600px){
  .nav{gap:12px;font-size:13px}
  .hero{padding:24px 18px}
  .block{padding:18px}
}