:root{
  --bg:#ffffff; --bg-alt:#f6f7f9; --card:#ffffff;
  --text:#1a1a1a; --muted:#6b7280; --border:#e5e7eb;
  --accent:#4f6ef7; --accent-soft:#eef1ff;
  --radius:14px; --maxw:760px;
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-serif:"Georgia","Noto Serif SC",serif;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0d1117; --bg-alt:#161b22; --card:#161b22; --text:#e6edf3; --muted:#8b98a5; --border:#30363d; --accent:#5b8cff; --accent-soft:#1c2740; }
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--text);font-family:var(--font-sans);line-height:1.6;transition:background .2s,color .2s}
a{color:inherit;text-decoration:none}
a:hover{color:var(--accent)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 1.25rem}

/* ---- header ---- */
.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid var(--border);background:rgba(var(--bg),0.85);backdrop-filter:saturate(1.3) blur(6px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.site-brand{font-weight:700;font-size:1.15rem;letter-spacing:.2px}
.site-nav{display:flex;gap:1.1rem;align-items:center;font-size:.95rem}
.site-nav .nav-cta{background:var(--accent);color:#fff;padding:.4rem .8rem;border-radius:8px;font-weight:600}
.site-nav .nav-cta:hover{color:#fff;filter:brightness(1.05)}

/* ---- header search (Pagefind) ---- */
.header-search{flex:1;max-width:260px;margin:0 1rem}
.header-search .pagefind-ui__search-input{height:36px;border-radius:9px;border:1px solid var(--border);background:var(--bg-alt);padding:0 .8rem;width:100%;font-size:.9rem;color:var(--text)}
.header-search .pagefind-ui__search-input::placeholder{color:var(--muted)}

/* ---- hero ---- */
.hero{margin:3rem 0 2.4rem;padding:2rem 1.6rem;border-radius:var(--radius);border:1px solid var(--border);background:linear-gradient(160deg,var(--accent-soft),transparent 70%)}
.hero-eyebrow{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem}
.hero h1{font-size:2.4rem;font-weight:800;letter-spacing:-.02em;margin-bottom:.6rem;line-height:1.15}
.hero-desc{color:var(--text);font-size:1.08rem;max-width:38em}
.hero-lead{color:var(--muted);font-size:.95rem;margin-top:.7rem}

/* ---- section title ---- */
.section-title{font-size:1.15rem;font-weight:700;margin:2rem 0 1rem;display:flex;align-items:center;gap:.5rem}
.section-title::after{content:"";flex:1;height:1px;background:var(--border)}

/* ---- posts ---- */
.posts{display:grid;grid-template-columns:1fr;gap:1rem}
.post-card{background:var(--card);border:1px solid var(--border);border-left:3px solid var(--border);border-radius:var(--radius);padding:1.2rem 1.3rem;transition:border-color .15s,transform .15s,box-shadow .15s}
.post-card:hover{border-left-color:var(--accent);border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 22px rgba(0,0,0,.07)}
.post-card-title{font-size:1.08rem;font-weight:700;margin-bottom:.35rem}
.post-card-meta{color:var(--muted);font-size:.8rem;margin-bottom:.55rem}
.post-card-summary{color:var(--muted);font-size:.92rem;line-height:1.6}

/* ---- article ---- */
.post h1{font-size:1.9rem;font-weight:800;letter-spacing:-.01em;margin:2rem 0 .6rem;line-height:1.25}
.post .meta{color:var(--muted);font-size:.85rem;margin-bottom:1.4rem}
.post .content{font-size:1.05rem;line-height:1.9;font-family:var(--font-serif)}
.post .content p{margin:0 0 1.2em}
.post .content h2,.post .content h3,.post .content h4{margin:1.6em 0 .6em;font-family:var(--font-sans);font-weight:700}
.post .content img{max-width:100%;height:auto;border-radius:var(--radius);margin:1.2em 0}
.post .content pre{background:var(--bg-alt);border:1px solid var(--border);border-radius:12px;padding:1rem;overflow:auto;font-size:.9rem;margin:1.2em 0}
.post .content code{font-family:"SFMono-Regular",Consolas,monospace;font-size:.9em;background:var(--bg-alt);padding:.15em .35em;border-radius:5px}
.post .content pre code{background:none;padding:0}
.post .content blockquote{border-left:3px solid var(--accent);margin:1.2em 0;padding:0 0 0 1em;color:var(--muted)}
.post .tags{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border)}
.post .tags span{background:var(--accent-soft);color:var(--accent);padding:.25rem .6rem;border-radius:999px;font-size:.78rem}

/* ---- pagination ---- */
.pagination{display:flex;gap:.5rem;justify-content:center;margin:2rem 0;list-style:none}
.pagination a,.pagination span{display:inline-block;padding:.4rem .7rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;color:var(--muted)}
.pagination .active span{background:var(--accent);border-color:var(--accent);color:#fff}
.pagination a:hover{color:var(--accent);border-color:var(--accent)}

/* ---- footer ---- */
.site-footer{margin-top:3rem;border-top:1px solid var(--border);padding:1.6rem 0 2rem;color:var(--muted);font-size:.85rem}
.site-footer a{color:var(--muted)}
.site-footer a:hover{color:var(--accent)}

/* 备案号（ICP + 公安联网备案）：图标紧贴备案号之前，整体可点击跳官方查询页 */
.beian{display:inline-flex;align-items:center;margin:.35rem .8rem 0 0}
.beian a{display:inline-flex;align-items:center;gap:.3rem}
.beian-icon{height:16px;width:auto}

/* ---- notfound ---- */
.notfound{text-align:center;padding:5rem 0}
.notfound h1{font-size:4rem;font-weight:800}
.notfound p{color:var(--muted);margin:.5rem 0 1rem}

/* ---- responsive ---- */
@media (max-width:600px){
  .header-inner{flex-wrap:wrap;height:auto;padding:.6rem 0;gap:.6rem}
  .header-search{order:3;flex-basis:100%;max-width:none;margin:0}
  .site-nav{gap:.7rem;font-size:.88rem}
  .hero h1{font-size:1.8rem}
  .post h1{font-size:1.5rem}
}