*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Georgia,"Noto Serif SC","PingFang SC",serif;
  color:#2a2a2a;
  background:#fff;
  line-height:1.82;
  font-size:16px;
}
.sans{font-family:"PingFang SC","Microsoft YaHei",sans-serif}
img{display:block;max-width:100%;height:auto}
a{color:#1565c0;text-decoration:none}
a:hover{text-decoration:underline}
.wrap{width:min(1080px,calc(100% - 36px));margin:0 auto}

.site-top{
  position:sticky;top:0;z-index:90;
  background:#fff;border-bottom:1px solid #e8e8e8;
  padding:16px 0;
}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:700;font-size:15px;text-decoration:none}
.brand:hover{text-decoration:none;color:#333}
.brand img{width:38px;border-radius:9px}
.menu-btn{display:none;border:1px solid #d0d0d0;background:#fff;padding:7px 12px;border-radius:8px;font-size:14px;cursor:pointer}
.top-nav{display:flex;gap:18px;flex-wrap:wrap}
.top-nav a{color:#555;font-size:14px;font-weight:600;text-decoration:none}
.top-nav a:hover{color:#111;text-decoration:none}
.mnav{display:none;flex-direction:column;padding:12px 0 4px;border-top:1px solid #f0f0f0;margin-top:12px}
.mnav.open{display:flex}
.mnav a{padding:10px 0;border-bottom:1px solid #f5f5f5;color:#444;font-size:14px;text-decoration:none}

.blog-hero{padding:36px 0 8px;border-bottom:1px solid #eee;margin-bottom:32px}
.blog-hero h1{font-size:clamp(26px,4vw,36px);line-height:1.3;margin:0 0 14px;color:#111}
.blog-hero .dek{font-size:17px;color:#555;margin:0 0 16px;max-width:760px}
.blog-meta{font-size:13px;color:#888;display:flex;flex-wrap:wrap;gap:12px 20px}
.ext-links{font-size:14px;color:#666;margin-top:14px}
.ext-links a{margin:0 4px}

.blog-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 260px;
  gap:48px;
  align-items:start;
  margin:32px 0 56px;
}
.blog-main{min-width:0}
.blog-main h2{font-size:22px;margin:36px 0 14px;color:#111;padding-top:8px}
.blog-main h2:first-of-type{margin-top:0}
.blog-main h3{font-size:17px;margin:24px 0 10px;color:#222}
.blog-main p,.blog-main li{font-size:16px;color:#444;margin:0 0 14px}
.blog-main ul,.blog-main ol{padding-left:22px;margin:0 0 16px}
.blog-main figure{margin:20px 0;border:1px solid #ececec;border-radius:8px;overflow:hidden;background:#fafafa}
.blog-main figcaption{padding:10px 14px;font-size:13px;color:#666;border-top:1px solid #eee;background:#fff}

.pullquote{
  margin:28px 0;padding:22px 26px;
  background:#f7f9fc;border-left:4px solid #1565c0;
  font-style:italic;color:#444;font-size:17px;
}
.note-box{padding:16px 18px;border-radius:8px;background:#fffbeb;border:1px solid #fde68a;color:#78350f;font-size:14px;margin:18px 0}
.thumb-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}
.thumb-row img{aspect-ratio:2/3;object-fit:cover;width:100%;border-radius:6px;border:1px solid #eee}
.thumb-row figcaption{font-size:12px;color:#666;margin-top:6px;text-align:center}

.blog-sidebar{position:relative}
.toc-sticky{
  position:sticky;top:84px;
  border:1px solid #e8e8e8;border-radius:10px;
  padding:20px 18px;background:#fafafa;
}
.toc-sticky h3{
  margin:0 0 14px;font-size:12px;font-weight:700;
  text-transform:uppercase;letter-spacing:.1em;color:#888;
  font-family:"PingFang SC","Microsoft YaHei",sans-serif;
}
.toc-sticky ul{list-style:none;padding:0;margin:0}
.toc-sticky li{border-bottom:1px solid #eee}
.toc-sticky li:last-child{border:none}
.toc-sticky a{
  display:block;padding:9px 0;font-size:14px;color:#555;
  text-decoration:none;font-family:"PingFang SC","Microsoft YaHei",sans-serif;
}
.toc-sticky a:hover{color:#1565c0;text-decoration:none}
.toc-sticky a.active{color:#1565c0;font-weight:600}
.sidebar-box{
  margin-top:20px;border:1px solid #e8e8e8;border-radius:10px;
  padding:18px;background:#fff;
}
.sidebar-box h4{margin:0 0 10px;font-size:13px;color:#666;font-weight:700}
.sidebar-box p{font-size:13px;color:#666;margin:0;line-height:1.6}
.sidebar-box img{border-radius:6px;border:1px solid #eee;margin-top:8px}

.faq-sec{margin:40px 0 48px;padding-top:32px;border-top:1px solid #eee}
.faq-sec h2{font-size:22px;margin:0 0 16px}
.faq-sec details{border:1px solid #ececec;border-radius:8px;padding:14px 18px;margin-bottom:10px;background:#fafafa}
.faq-sec summary{font-weight:600;cursor:pointer;color:#222;font-family:"PingFang SC","Microsoft YaHei",sans-serif}
.faq-sec p{margin:10px 0 0;font-size:14px;color:#555}

.site-foot{padding:32px 0 40px;border-top:1px solid #ddd;font-size:13px;color:#888;margin-top:20px}
.site-foot a{color:#666;margin-right:16px;text-decoration:none}
.site-foot a:hover{text-decoration:underline}

.prose{padding:32px 0 56px;max-width:720px}
.prose h1{font-size:28px;margin:0 0 20px;color:#111}
.prose h2{font-size:20px;margin:28px 0 12px;color:#222}
.prose p,.prose li{font-size:16px;color:#444}
.related{margin-top:36px;padding:18px 20px;border:1px solid #e8e8e8;border-radius:10px;background:#f9fafb}
.related h3{margin:0 0 10px;font-size:15px}
.related a{display:block;padding:5px 0;font-size:14px}

.err{min-height:58vh;display:grid;place-items:center;text-align:center;padding:40px 16px}
.err h1{font-size:48px;margin:0 0 12px;color:#ccc}

@media(max-width:860px){
  .blog-layout{grid-template-columns:1fr}
  .toc-sticky{position:static}
  .thumb-row{grid-template-columns:1fr}
  .menu-btn{display:inline-flex}
  .top-nav{display:none}
}