:root{
  --bg:#ffffff;
  --bg-alt:#f5f5f7;
  --ink:#1d1d1f;
  --gray:#86868b;
  --line:#d2d2d7;
  --accent:#1a7f5a;
  --accent-press:#14684a;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue","Segoe UI",sans-serif;
  --radius:18px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.55;letter-spacing:-0.01em;display:flex;flex-direction:column;min-height:100vh}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* nav — matches the home page */
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,0.06)}
.nav{display:flex;align-items:center;justify-content:space-between;height:52px;max-width:1000px;margin:0 auto;padding:0 22px}
.brand{font-weight:600;font-size:19px;letter-spacing:-0.02em;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand span{color:var(--accent)}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:var(--ink);font-size:13px;opacity:0.85;transition:opacity .2s}
.nav-links a:hover{opacity:1;text-decoration:none}
.nav-cta{background:var(--accent);color:#fff !important;padding:7px 14px;border-radius:980px;font-weight:500;opacity:1 !important}
.nav-cta:hover{background:var(--accent-press)}
@media(max-width:640px){.nav-links a:not(.nav-cta){display:none}}

/* page frame */
.page{flex:1 0 auto;padding:56px 0 72px}
.container{max-width:720px;margin:0 auto;padding:0 22px}

/* prose / articles */
.prose{color:var(--ink)}
.prose h1{font-size:40px;line-height:1.08;font-weight:650;letter-spacing:-0.03em;margin:0 0 18px}
.prose h2{font-size:25px;font-weight:600;letter-spacing:-0.02em;margin:38px 0 12px}
.prose h3{font-size:20px;font-weight:600;letter-spacing:-0.01em;margin:28px 0 8px}
.prose h4{font-size:17px;font-weight:600;margin:22px 0 6px}
.prose p{margin:0 0 16px;color:#2b2b2f}
.prose ul,.prose ol{margin:0 0 16px 24px;color:#2b2b2f}
.prose li{margin:0 0 7px}
.prose blockquote{margin:0 0 18px;padding:2px 18px;border-left:3px solid var(--accent);color:var(--gray)}
.prose hr{border:0;border-top:1px solid var(--line);margin:32px 0}
.prose a{text-decoration:underline;text-underline-offset:2px}
.prose code{font-family:"SF Mono",ui-monospace,SFMono-Regular,Menlo,monospace;font-size:0.88em;background:var(--bg-alt);padding:2px 6px;border-radius:6px}
.prose pre{background:var(--bg-alt);border:1px solid var(--line);border-radius:12px;padding:16px 18px;overflow-x:auto;margin:0 0 18px}
.prose pre code{background:none;padding:0}
.prose img{max-width:100%;border-radius:12px;margin:8px 0 18px}
.prose .lede{font-size:20px;color:var(--gray);margin-bottom:8px}
.prose .back{display:inline-block;font-size:13px;color:var(--gray);text-decoration:none;margin-bottom:18px}
.prose .back:hover{color:var(--accent)}
.post-meta{color:var(--gray);font-size:14px;margin:-8px 0 26px}

/* blog listing */
.post-list{display:flex;flex-direction:column;gap:14px;margin-top:26px}
.post-card{display:block;border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;background:var(--bg);transition:border-color .18s ease,transform .18s ease}
.post-card:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-1px)}
.post-card .post-meta{display:block;margin:0 0 6px;font-size:13px}
.post-card h2{font-size:21px;font-weight:600;letter-spacing:-0.02em;color:var(--ink);margin:0 0 6px}
.post-card p{color:var(--gray);font-size:15px;margin:0}
.muted{color:var(--gray)}

/* footer — matches the home page */
footer{flex-shrink:0;border-top:1px solid var(--line);padding:26px 0 20px;background:var(--bg-alt)}
.foot{max-width:1000px;margin:0 auto;padding:0 22px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;font-size:13px;color:var(--gray)}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{color:var(--gray)}
.foot-links a:hover{color:var(--accent);text-decoration:none}
.foot-legal{margin-top:14px;padding-top:14px;border-top:1px dashed var(--line);align-items:flex-start;font-size:12px}
.foot-legal-label{font-weight:600;color:var(--ink);opacity:0.85;letter-spacing:0.02em;text-transform:uppercase;font-size:11px;flex-shrink:0}
.foot-legal .foot-links{gap:14px 18px}
@media(max-width:640px){.foot-legal{flex-direction:column}}

/* pipe tables */
.prose .table-wrap{overflow-x:auto;margin:0 0 20px}
.prose table{border-collapse:collapse;width:100%;font-size:15px}
.prose th,.prose td{border:1px solid var(--line);padding:9px 13px;text-align:left;vertical-align:top}
.prose thead th{background:var(--bg-alt);font-weight:600;color:var(--ink)}
.prose tbody tr:nth-child(even){background:#fafafa}

/* footnotes */
.prose sup.fn-ref{font-size:0.72em;line-height:0}
.prose sup.fn-ref a{text-decoration:none;font-weight:500;padding:0 1px}
.footnotes{margin-top:44px;font-size:14px;color:var(--gray)}
.footnotes hr{border:0;border-top:1px solid var(--line);margin:0 0 16px}
.footnotes ol{margin:0 0 0 20px;display:flex;flex-direction:column;gap:8px}
.footnotes li{padding-left:4px}
.footnotes a{word-break:break-word}
.footnotes .fn-back{margin-left:6px;text-decoration:none;color:var(--accent)}

/* table of contents (nav.toc at top of long posts) */
.prose .toc{background:var(--bg-alt);border:1px solid var(--line);border-radius:12px;padding:14px 20px 10px;margin:0 0 32px;font-size:15px}
.prose .toc .toc-title{font-weight:600;font-size:12px;letter-spacing:0.08em;text-transform:uppercase;color:var(--gray);margin:0 0 8px}
.prose .toc ol{list-style:decimal;margin:0 0 0 22px;color:#2b2b2f}
.prose .toc li{margin:0 0 4px}
.prose .toc a{color:var(--ink);text-decoration:none;opacity:0.9}
.prose .toc a:hover{color:var(--accent);text-decoration:underline;opacity:1}
@media(max-width:640px){.prose .toc{padding:12px 16px 8px;font-size:14px}}

/* GitHub-style callouts */
.callout{border:1px solid var(--line);border-left-width:4px;border-radius:12px;padding:14px 18px;margin:0 0 20px;background:var(--bg-alt)}
.callout .callout-title{font-weight:600;margin:0 0 6px;font-size:14px;letter-spacing:0.01em}
.callout > :last-child{margin-bottom:0}
.callout p{margin:0 0 8px}
.callout-note{border-left-color:#3178c6;background:#eff5fc}
.callout-note .callout-title{color:#215a9e}
.callout-tip{border-left-color:var(--accent);background:#eef6f1}
.callout-tip .callout-title{color:var(--accent-press)}
.callout-important{border-left-color:#7048c4;background:#f3eefb}
.callout-important .callout-title{color:#5a34a3}
.callout-warning{border-left-color:#e0a100;background:#fdf6e3}
.callout-warning .callout-title{color:#8a5a00}
.callout-caution{border-left-color:#d93025;background:#fdeceb}
.callout-caution .callout-title{color:#a3231b}