:root{
  --bg:#f8fafc;
  --text:#0f172a;
  --muted:#475569;
  --accent:#1e40af;
  --border:#e2e8f0;
  --thead:#eef2f7;
  --card:#ffffff;
  --shadow:0 2px 8px rgba(0,0,0,0.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;
  line-height:1.65;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.wrap{max-width:780px;margin:0 auto;padding:0 20px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{color:var(--text);font-weight:700;letter-spacing:-0.01em;line-height:1.25;margin:1.6em 0 0.6em}
h1{font-size:2rem;margin-top:0.5em}
h2{font-size:1.45rem;padding-top:0.4em;border-top:1px solid var(--border)}
h3{font-size:1.15rem}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em 1.2em}
li{margin:0.2em 0}
img,svg{max-width:100%;height:auto;display:block}
figure{margin:1.6em 0}
figcaption{color:var(--muted);font-size:0.9rem;margin-top:0.5em;text-align:center}

/* header */
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(248,250,252,0.92);
  backdrop-filter:saturate(140%) blur(6px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700}
.brand:hover{text-decoration:none}
.brand-mark{
  width:32px;height:32px;border-radius:50%;
  background:var(--accent);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:700;font-size:16px;letter-spacing:0;
}
.brand-name{font-size:1.05rem;letter-spacing:-0.01em}
.main-nav{display:flex;gap:22px}
.main-nav a{color:var(--muted);font-weight:500;font-size:0.98rem}
.main-nav a:hover,.main-nav a.active{color:var(--accent);text-decoration:none}

/* main */
main.wrap{padding-top:32px;padding-bottom:56px}

/* breadcrumbs */
.breadcrumbs{font-size:0.9rem;color:var(--muted);margin-bottom:0.8em}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--accent)}
.breadcrumbs .sep{margin:0 6px;color:var(--border)}

/* post */
.post-head{margin-bottom:1.4em}
.post-meta{color:var(--muted);font-size:0.9rem;margin-top:0.4em;display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.post-tags .tag{background:var(--thead);color:var(--muted);padding:2px 8px;border-radius:4px;font-size:0.82rem;margin-right:6px}
.post-body p:first-child{font-size:1.08rem;color:var(--text)}

/* tables */
table{border-collapse:collapse;width:100%;margin:1.4em 0;font-size:0.96rem;background:var(--card);box-shadow:var(--shadow);border-radius:8px;overflow:hidden}
thead th{background:var(--thead);color:var(--text);text-align:left;font-weight:700;padding:12px 14px;border-bottom:1px solid var(--border)}
tbody td{padding:11px 14px;border-bottom:1px solid var(--border);vertical-align:top}
tbody tr:last-child td{border-bottom:none}
tbody tr:nth-child(even){background:#fbfcfe}

/* blockquotes */
blockquote{
  margin:1.4em 0;padding:14px 18px;
  background:var(--card);border-left:4px solid var(--accent);
  color:var(--muted);border-radius:0 6px 6px 0;box-shadow:var(--shadow);
}
blockquote p:last-child{margin:0}

/* code */
code{background:var(--thead);padding:2px 6px;border-radius:4px;font-size:0.92em}
pre{background:#0f172a;color:#f1f5f9;padding:14px 16px;border-radius:8px;overflow-x:auto}
pre code{background:transparent;color:inherit;padding:0}

/* cards on home */
.cards{display:grid;grid-template-columns:1fr;gap:14px;margin:1.2em 0 1.8em}
.card{
  display:block;background:var(--card);
  padding:20px;border-radius:8px;box-shadow:var(--shadow);
  color:var(--text);
}
.card:hover{text-decoration:none;transform:translateY(-1px);box-shadow:0 4px 14px rgba(0,0,0,0.08)}
.card-title{margin:0 0 6px;font-size:1.08rem;font-weight:700;color:var(--text)}
.card-lead{margin:0 0 10px;color:var(--muted);font-size:0.94rem;line-height:1.5}
.card-date{color:var(--muted);font-size:0.82rem}

/* related */
.related{margin-top:2.2em;padding-top:1.2em;border-top:1px solid var(--border)}
.related h2{border-top:none;padding-top:0;margin-top:0}
.related ul{list-style:none;margin:0;padding:0}
.related li{margin:0.6em 0}

/* footer */
.site-footer{border-top:1px solid var(--border);background:#fff;margin-top:40px}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px;padding:32px 20px;color:var(--muted);font-size:14px}
.foot-title{font-weight:700;color:var(--text);margin-bottom:8px;font-size:14px}
.foot-text{margin:0;line-height:1.55}
.foot-list{list-style:none;margin:0;padding:0}
.foot-list li{margin:4px 0}
.foot-list a{color:var(--muted)}
.foot-list a:hover{color:var(--accent)}
.foot-copy{margin-top:12px;font-size:12px;color:var(--muted);opacity:0.85}

/* home */
.home .lead p{font-size:1.08rem;color:var(--text)}
.home-section{margin-top:2em}
.home-section h2{border-top:none;padding-top:0}

@media (max-width:640px){
  body{font-size:16px}
  h1{font-size:1.6rem}
  h2{font-size:1.25rem}
  .footer-inner{grid-template-columns:1fr;gap:20px}
  .main-nav{gap:14px}
  .main-nav a{font-size:0.9rem}
  .brand-name{display:none}
  .wrap{padding:0 16px}
  table{font-size:0.9rem}
  thead th,tbody td{padding:8px 10px}
}