/* site.css — jingtao.net personal identity + connection hub (2026 refresh)
   Modern, responsive, system-font, no framework. Root-absolute referenced
   (/css/site.css) so it resolves from any page depth on GitHub Pages. */

:root{
  --bg:#0d1117; --panel:#161b22; --ink:#e6edf3; --muted:#9aa7b4;
  --line:#243040; --accent:#3fb6ff; --accent-2:#7ee787; --max:980px;
}
@media (prefers-color-scheme: light){
  :root{ --bg:#ffffff; --panel:#f6f8fa; --ink:#1f2328; --muted:#57606a;
         --line:#d0d7de; --accent:#0969da; --accent-2:#1a7f37; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,
    "PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.6; font-size:17px;
}
a{color:var(--accent); text-decoration:none}
a:hover{text-decoration:underline}
.content,#content{max-width:var(--max); margin:0 auto; padding:0 20px 64px}
h1,h2,h3{line-height:1.25; font-weight:700}
h2{margin-top:2.2em; border-bottom:1px solid var(--line); padding-bottom:.3em}
code,pre,kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
pre{background:var(--panel); border:1px solid var(--line); border-radius:8px;
    padding:14px; overflow:auto}

/* nav */
.site-nav{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  flex-wrap:wrap; max-width:var(--max); margin:0 auto; padding:14px 20px;
}
.site-nav .brand{font-weight:800; color:var(--ink); font-size:1.05rem}
.nav-links{display:flex; gap:18px; flex-wrap:wrap; align-items:center}
.nav-links a{color:var(--muted)}
.nav-links a:hover{color:var(--ink); text-decoration:none}
.nav-cta{
  background:var(--accent); color:#001018 !important; padding:7px 14px;
  border-radius:7px; font-weight:700;
}
.nav-cta:hover{filter:brightness(1.08); text-decoration:none}

/* hero */
.hero{max-width:var(--max); margin:0 auto; padding:48px 20px 8px}
.hero h1{font-size:2.1rem; margin:.1em 0 .35em}
.hero .lede{font-size:1.18rem; color:var(--muted); max-width:46rem}
.hero .cta-row{display:flex; gap:12px; flex-wrap:wrap; margin:26px 0 8px}
.btn{display:inline-block; padding:11px 18px; border-radius:8px; font-weight:700}
.btn-primary{background:var(--accent); color:#001018}
.btn-ghost{border:1px solid var(--line); color:var(--ink)}
.btn:hover{text-decoration:none; filter:brightness(1.06)}
.hero .meta{color:var(--muted); font-size:.95rem; margin-top:6px}

/* lane cards */
.lanes{display:grid; grid-template-columns:repeat(2,1fr); gap:18px; margin:18px 0}
@media (max-width:720px){ .lanes{grid-template-columns:1fr} body{font-size:16px} }
.lane{
  background:var(--panel); border:1px solid var(--line); border-radius:12px;
  padding:20px;
}
.lane h3{margin:.1em 0 .4em; font-size:1.18rem}
.lane .who{color:var(--muted); font-size:.92rem; margin:0 0 .5em}
.lane p{margin:.45em 0}
.lane .proof{font-size:.9rem; color:var(--muted)}
.lane .tag{display:inline-block; background:rgba(63,182,255,.12); color:var(--accent);
  border:1px solid var(--line); border-radius:999px; padding:1px 10px; font-size:.78rem}

/* proof strip + table */
.proof-strip{background:var(--panel); border:1px solid var(--line); border-radius:12px;
  padding:16px 20px; margin:20px 0}
table{border-collapse:collapse; width:100%; margin:1em 0; font-size:.95rem}
th,td{border:1px solid var(--line); padding:8px 10px; text-align:left; vertical-align:top}
th{background:var(--panel)}

/* contact */
.cta-band{background:var(--panel); border:1px solid var(--line); border-radius:12px;
  padding:24px; margin:28px 0; text-align:center}
.cta-band h2{border:0; margin-top:0}

/* footer */
.site-footer{max-width:var(--max); margin:40px auto 0; padding:22px 20px;
  border-top:1px solid var(--line); color:var(--muted); font-size:.92rem; text-align:center}
.site-footer a{color:var(--muted)}
.site-footer .fineprint{opacity:.7; font-size:.85rem}

/* org preamble/postamble wrappers Org emits */
#preamble,#postamble{}
.title{font-size:2rem; text-align:left}