/* JBJFLab 博客样式 */
:root{
  --bg:#fbfbfa; --ink:#1c2128; --muted:#69727f; --line:#e4e7ea;
  --accent:#0f766e; --code-bg:#f2f4f5; --card:#ffffff;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0d1117; --ink:#e6edf3; --muted:#9aa4b2; --line:#222b36;
    --accent:#5eead4; --code-bg:#161d26; --card:#121820;
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px; line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:720px; margin:0 auto; padding:0 22px}

/* ---------- header / footer ---------- */
header.site{padding:34px 0 18px; border-bottom:1px solid var(--line)}
.site .row{display:flex; align-items:baseline; justify-content:space-between; gap:16px; flex-wrap:wrap}
.brand{font-weight:700; font-size:18px; color:var(--ink); text-decoration:none; letter-spacing:-.01em}
.brand span{color:var(--accent)}
nav a{color:var(--muted); text-decoration:none; font-size:14px; margin-left:18px}
nav a:first-child{margin-left:0}
nav a:hover{color:var(--accent)}
footer.site{
  padding:28px 0 48px; border-top:1px solid var(--line);
  color:var(--muted); font-size:13px;
  display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap;
}
footer.site a{color:var(--muted); text-decoration:none}
footer.site a:hover{color:var(--accent)}

/* ---------- index ---------- */
.hero{padding:58px 0 32px}
.hero h1{font-size:clamp(30px,5vw,42px); margin:0 0 14px; letter-spacing:-.02em; line-height:1.25}
.hero p{color:var(--muted); margin:0; font-size:16.5px}
.posts{list-style:none; padding:0; margin:14px 0 34px}
.posts li{padding:26px 0; border-top:1px solid var(--line)}
.posts h2{margin:0 0 6px; font-size:20px; line-height:1.5; letter-spacing:-.01em}
.posts h2 a{color:var(--ink); text-decoration:none}
.posts h2 a:hover{color:var(--accent)}
.meta{color:var(--muted); font-size:13px; letter-spacing:.03em; margin:0 0 10px; font-variant-numeric:tabular-nums}
.excerpt{margin:0; color:var(--muted); font-size:15px}
.excerpt a{color:var(--accent); text-decoration:none}
.about{margin:10px 0 60px; padding:24px 26px; border:1px solid var(--line); border-radius:14px; background:var(--card)}
.about h2{margin:0 0 8px; font-size:17px}
.about p{margin:0; color:var(--muted); font-size:14.5px}
.about a{color:var(--accent); text-decoration:none}

/* ---------- article ---------- */
article.post{padding:42px 0 28px}
article.post h1{font-size:clamp(28px,5vw,38px); line-height:1.35; margin:0 0 10px; letter-spacing:-.02em}
article.post .meta{margin-bottom:30px}
article.post h2{font-size:21px; margin:38px 0 10px; letter-spacing:-.01em}
article.post h3{font-size:17.5px; margin:26px 0 8px}
article.post p{margin:0 0 16px}
article.post ul,article.post ol{margin:0 0 18px; padding-left:1.4em}
article.post li{margin:5px 0}
article.post a{color:var(--accent)}
blockquote{
  margin:24px 0; padding:12px 18px; border-left:3px solid var(--accent);
  color:var(--muted); background:var(--code-bg); border-radius:0 8px 8px 0;
}
blockquote p{margin:0}
code{
  font-family:"JetBrains Mono",Consolas,Menlo,monospace; font-size:.88em;
  background:var(--code-bg); padding:2px 6px; border-radius:5px;
}
pre{
  background:var(--code-bg); padding:16px 18px; border-radius:10px;
  overflow:auto; border:1px solid var(--line); margin:0 0 18px;
}
pre code{background:none; padding:0; font-size:13.5px; line-height:1.65}
table{width:100%; border-collapse:collapse; margin:8px 0 20px; font-size:14.5px}
th,td{text-align:left; padding:9px 10px; border-bottom:1px solid var(--line); vertical-align:top}
th{color:var(--muted); font-weight:600; font-size:13.5px; white-space:nowrap}
td code{font-size:.85em}
.back{display:inline-block; margin-bottom:24px; color:var(--muted); text-decoration:none; font-size:14px}
.back:hover{color:var(--accent)}
hr{border:0; border-top:1px solid var(--line); margin:34px 0}

/* ---------- language switch ---------- */
.header-right{display:flex; align-items:center; gap:16px}
.lang-toggle{
  display:inline-flex; align-items:center; justify-content:center;
  height:30px; padding:0 12px; border-radius:8px; cursor:pointer;
  font-size:12.5px; letter-spacing:.04em; font-family:inherit;
  color:var(--muted); background:var(--card); border:1px solid var(--line);
  transition:all .15s ease;
}
.lang-toggle:hover{color:var(--accent); border-color:var(--accent)}
[data-lang="zh"] .only-en{display:none !important}
[data-lang="en"] .only-zh{display:none !important}
.lang-en{padding-top:2px}
.lang-en h1{font-size:clamp(26px,4.6vw,36px)}