:root{
  --bg:#f7f8fa;
  --surface:#ffffff;
  --fg:#1a1a1a;
  --muted:#6b7280;
  --accent:#2563eb;
  --accent-2:#7c3aed;
  --accent-soft:#eef3ff;
  --border:#e6e8ec;
  --code-bg:#f1f5f9;
  --pre-bg:#0f172a;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 10px 30px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--fg);
  background:var(--bg);
  line-height:1.75;
  font-size:17px;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:720px;margin:0 auto;padding:0 20px}

/* 顶部导航 */
header.site{border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;background:rgba(247,248,250,.82);backdrop-filter:saturate(180%) blur(10px);z-index:10}
header.site .container{display:flex;align-items:center;justify-content:space-between}
.logo{display:inline-flex;align-items:center;font-size:1.18rem;font-weight:800;color:var(--fg);letter-spacing:-.01em}
.logo::before{content:"";display:inline-block;width:11px;height:11px;margin-right:9px;border-radius:3px;background:linear-gradient(135deg,var(--accent),var(--accent-2))}
nav a{margin-left:18px;color:var(--muted);font-size:.92rem;font-weight:500}
nav a:hover{color:var(--fg);text-decoration:none}

/* 首页 hero */
.hero{text-align:center;padding:54px 0 38px}
.hero-title{font-size:2.5rem;font-weight:800;margin:0 0 10px;letter-spacing:-.02em;background:linear-gradient(135deg,#1e293b,#3b82f6);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{color:var(--muted);font-size:1.05rem;margin:0 auto;max-width:520px}

/* 文章列表卡片 */
.post-list{list-style:none;padding:0;margin:0 0 24px;display:grid;gap:18px}
.post-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.post-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d4dded}
.post-card .post-link{display:block;padding:22px 24px;color:var(--fg)}
.post-card .post-date{display:inline-block;font-size:.72rem;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:3px 11px;border-radius:999px;margin-bottom:12px}
.post-card-title{margin:0 0 8px;font-size:1.32rem;font-weight:700;line-height:1.35;color:var(--fg)}
.post-card .post-card-excerpt{color:#475569;margin:0;font-size:.95rem;line-height:1.6}
.post-card .post-card-more{display:inline-block;margin-top:14px;color:var(--accent);font-size:.85rem;font-weight:600}

/* 文章页 */
.article{max-width:720px}
.post-title{font-size:2.15rem;font-weight:800;margin:18px 0 16px;line-height:1.3;letter-spacing:-.01em}
.post-byline{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.9rem;margin-bottom:30px;padding-bottom:22px;border-bottom:1px solid var(--border)}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.92rem;flex:none}
.post-byline .by-author{font-weight:600;color:#334155}
.post-byline .dot{opacity:.45}
.post-content{font-size:1.05rem}
.post-content h2{font-size:1.5rem;margin:1.8em 0 .6em}
.post-content h3{font-size:1.25rem;margin:1.5em 0 .5em}
.post-content p{margin:1em 0}
.post-content ul,.post-content ol{padding-left:1.4em}
.post-content li{margin:.4em 0}
.post-content img{max-width:100%;border-radius:8px}
.post-content a{word-break:break-word}
.post-content pre{background:var(--pre-bg);color:#e2e8f0;padding:16px 18px;border-radius:10px;overflow:auto;font-size:.9em;line-height:1.6}
.post-content code{background:var(--code-bg);padding:2px 6px;border-radius:4px;font-size:.88em;font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace}
.post-content pre code{background:none;padding:0;color:inherit}
.post-content blockquote{border-left:3px solid var(--accent);margin:1.3em 0;padding:.4em 1.1em;color:#475569;background:#f8fafc;border-radius:0 8px 8px 0}
.post-content table{border-collapse:collapse;width:100%;margin:1.2em 0;font-size:.95em}
.post-content th,.post-content td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.post-content th{background:#f8fafc}
.back{display:inline-block;margin-top:36px;color:var(--muted);font-size:.92rem}

/* 上一篇 / 下一篇 */
.post-nav{display:flex;gap:12px;margin-top:30px;padding-top:18px;border-top:1px solid var(--border)}
.post-nav a{display:flex;flex-direction:column;flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:8px;color:var(--fg);transition:border-color .15s,box-shadow .15s}
.post-nav a:hover{border-color:var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.05);text-decoration:none}
.post-nav .nav-dir{font-size:.72rem;color:var(--muted);margin-bottom:2px}
.post-nav .nav-title{font-weight:600;font-size:.85rem;line-height:1.3}
.post-nav .nav-next{text-align:right;align-items:flex-end}
.post-nav .nav-empty{flex:1}

/* 页脚 */
footer.site{margin-top:64px;border-top:1px solid var(--border);padding:28px 0;color:var(--muted);font-size:.82rem;text-align:center}

@media (max-width:600px){
  body{font-size:16px}
  .hero{padding:36px 0 28px}
  .hero-title{font-size:1.9rem}
  .post-title{font-size:1.7rem}
  .post-card .post-link{padding:18px 18px}
  .post-nav{flex-direction:column}
  .post-nav .nav-next{text-align:left;align-items:flex-start}
}