:root{
  --bg:#ffffff; --fg:#1f2430; --muted:#6b7280; --line:#e6e8ee;
  --brand:#2563eb; --brand2:#7c3aed; --code:#0f172a; --codebg:#f6f8fa;
  --maxw:860px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
main{max-width:var(--maxw);margin:0 auto;padding:32px 20px 56px}

/* header */
.site-header{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  padding:12px 20px;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.brand{font-weight:800;font-size:20px;color:var(--fg)}
.brand span{color:var(--brand)}
.topnav{display:flex;gap:14px;flex-wrap:wrap;flex:1;font-size:14px}
.topnav a{color:var(--muted)}
.topnav a.active,.topnav a:hover{color:var(--brand);text-decoration:none}
.cta{font-size:14px;font-weight:600;padding:7px 14px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff!important}
.cta:hover{opacity:.9;text-decoration:none}

/* hero */
.hero{text-align:center;padding:40px 0 24px}
.hero h1{font-size:34px;line-height:1.3;margin:.2em 0}
.lead{color:var(--muted);font-size:18px;max-width:640px;margin:14px auto 24px}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;border:1px solid var(--line);font-weight:600;color:var(--fg)}
.btn:hover{text-decoration:none;border-color:var(--brand)}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:0}

/* grid cards */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:18px}
.card{display:block;padding:20px;border:1px solid var(--line);border-radius:14px;color:var(--fg);transition:.15s}
.card:hover{border-color:var(--brand);box-shadow:0 6px 24px rgba(37,99,235,.08);text-decoration:none;transform:translateY(-2px)}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0 0 12px;color:var(--muted);font-size:14px}
.card .more{color:var(--brand);font-weight:600;font-size:14px}

/* article */
.post h1{font-size:30px;line-height:1.35;margin:.1em 0 .6em;border-bottom:2px solid var(--line);padding-bottom:.4em}
.post h2{font-size:23px;margin:1.6em 0 .5em}
.post h3{font-size:19px;margin:1.3em 0 .4em}
.post p,.post li{font-size:16px}
.post img{max-width:100%;height:auto;border-radius:8px}
.post hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.post blockquote{margin:1.2em 0;padding:.6em 1em;border-left:4px solid var(--brand);background:#f8faff;color:#374151;border-radius:0 8px 8px 0}
.post code{background:var(--codebg);padding:.15em .4em;border-radius:5px;font-size:.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.post pre{background:var(--code);color:#e6edf3;padding:16px;border-radius:10px;overflow:auto;font-size:14px;line-height:1.6}
.post pre code{background:transparent;padding:0;color:inherit}
.post table{border-collapse:collapse;width:100%;margin:1.2em 0;font-size:14.5px;display:block;overflow-x:auto}
.post th,.post td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.post th{background:#f3f6fb;font-weight:700}
.post tr:nth-child(even) td{background:#fafbfd}
.post a{font-weight:500}
.post p img[src*="shields.io"]{display:inline-block;vertical-align:middle;margin:2px}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:28px 20px;text-align:center;color:var(--muted);font-size:14px}
.site-footer p{margin:6px 0}
.site-footer .muted{color:#9aa1ad;font-size:13px}

@media(max-width:560px){.hero h1{font-size:26px}.post h1{font-size:24px}.topnav{order:3;width:100%}}