*,*::before,*::after{box-sizing:border-box}
:root{
--bg:#f4f8fc;--surface:#ffffff;--surface2:#e9f1f9;
--ink:#0a1f30;--muted:#4a6376;--line:#d8e5f0;
--brand:#0057b8;--brand2:#0ea5e9;--accent:#10b981;
--r:6px;--measure:70ch;
--s1:.5rem;--s2:1rem;--s3:1.5rem;--s4:2.25rem;--s5:3.5rem;--s6:5rem;
}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-size:17px;line-height:1.65;
-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;line-height:1.15;margin:0;
letter-spacing:-.015em;font-weight:700;color:var(--ink)}
p{margin:0}
img{max-width:100%;height:auto}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--brand2);outline-offset:2px;border-radius:2px}
.skip{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;
padding:10px 16px;z-index:100}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.narrow{max-width:var(--measure);margin:0 auto;padding:0 24px}
/* ---- header ---- */
header.site{background:var(--surface);border-bottom:1px solid var(--line);
position:sticky;top:0;z-index:30}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;
max-width:1120px;margin:0 auto;padding:14px 24px;flex-wrap:wrap}
.brandmark{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-weight:800;font-size:1.25rem;
color:var(--ink);letter-spacing:-.03em;display:inline-flex;align-items:center;gap:9px}
.brandmark:hover{text-decoration:none}
.brandmark .dot{width:10px;height:10px;border-radius:50%;
background:var(--brand);flex:none}
.brandmark em{font-style:normal;color:var(--brand)}
.nav nav{display:flex;flex-wrap:wrap;gap:22px}
.nav nav a{color:var(--muted);font-weight:600;font-size:.93rem;font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif}
.nav nav a:hover{color:var(--brand);text-decoration:none}
/* ---- hero ---- */
.hero{padding:var(--s6) 0 var(--s5);background:var(--surface)}
.kicker{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;text-transform:uppercase;letter-spacing:.16em;
font-size:.72rem;font-weight:700;color:var(--brand);margin:0 0 var(--s2)}
.hero h1{font-size:clamp(2rem,4.6vw,3.05rem);max-width:19ch;margin:0 0 var(--s2)}
.hero .lede{font-size:1.16rem;color:var(--muted);max-width:56ch;line-height:1.6}
.pills{display:flex;flex-wrap:wrap;gap:9px;margin-top:var(--s4)}
.pill{display:inline-block;background:var(--surface2);border:1px solid var(--line);
color:var(--ink);border-radius:999px;padding:7px 15px;font-size:.85rem;font-weight:600;
font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif}
.pill:hover{border-color:var(--brand);color:var(--brand);text-decoration:none}
/* ---- sections + cards ---- */
.section{padding:var(--s5) 0}
.section+.section{padding-top:0}
.sechead{margin-bottom:var(--s4);max-width:60ch}
.sechead h2{font-size:1.7rem;margin:0 0 6px}
.sechead p{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid.two{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid,.grid.two{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
padding:22px;display:flex;flex-direction:column;gap:9px;
transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.card:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(10,20,40,.09)}
.card .cat{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-size:.68rem;text-transform:uppercase;
letter-spacing:.12em;font-weight:700;color:var(--brand2)}
.card h3{font-size:1.1rem;line-height:1.3}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--brand);text-decoration:none}
.card p{color:var(--muted);font-size:.93rem;flex:1}
.card .meta{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-size:.78rem;color:var(--muted);
border-top:1px solid var(--line);padding-top:11px;margin-top:4px}
/* ---- article ---- */
.posthead{padding:var(--s5) 0 var(--s3);background:var(--surface);
border-bottom:1px solid var(--line)}
.crumb{font-size:.85rem;color:var(--muted);margin-bottom:var(--s3)}
.posthead .cat{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-size:.7rem;text-transform:uppercase;
letter-spacing:.13em;font-weight:700;color:var(--brand);margin-bottom:12px}
.posthead h1{font-size:clamp(1.85rem,3.6vw,2.5rem);margin:0 0 14px}
.byline{color:var(--muted);font-size:.88rem;font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif}
.post{padding:var(--s4) 0 var(--s2)}
.post p{margin:0 0 1.15em}
.post h2{font-size:1.42rem;margin:2em 0 .55em;scroll-margin-top:84px}
.post h3{font-size:1.14rem;margin:1.7em 0 .45em}
.post ul,.post ol{margin:0 0 1.15em;padding-left:1.35em}
.post li{margin-bottom:.5em}
.post strong{font-weight:700}
.post table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:.94rem;
font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif}
.post th,.post td{border:1px solid var(--line);padding:11px 13px;text-align:left;
vertical-align:top}
.post th{background:var(--surface2);font-weight:700}
.post blockquote{margin:1.6em 0;padding:4px 0 4px 20px;
border-left:3px solid var(--brand2);color:var(--muted);font-style:italic}
.post code{font-family:ui-monospace,SFMono-Regular,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace;font-size:.9em;background:var(--surface2);
padding:2px 6px;border-radius:4px}
.toc{background:var(--surface2);border:1px solid var(--line);border-radius:var(--r);
padding:18px 22px;margin:0 0 var(--s4)}
.toc h4{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-size:.72rem;text-transform:uppercase;
letter-spacing:.12em;color:var(--muted);margin:0 0 10px}
.toc ol{margin:0;padding-left:1.1em}
.toc li{margin-bottom:5px;font-size:.92rem}
.toc a{color:var(--ink)}
.sources{background:var(--surface2);border:1px solid var(--line);
border-radius:var(--r);padding:20px 24px;margin:var(--s4) 0}
.sources h4{font-size:.95rem;margin:0 0 10px}
.sources ol{margin:0;padding-left:1.15em}
.sources li{margin-bottom:7px;font-size:.9rem}
.related{border-top:1px solid var(--line);margin-top:var(--s5);padding:var(--s5) 0 0}
.related h2{font-size:1.3rem;margin-bottom:var(--s3)}
/* ---- footer ---- */
footer.site{background:var(--surface);border-top:1px solid var(--line);
margin-top:var(--s6);padding:var(--s5) 0 var(--s4);color:var(--muted);font-size:.9rem}
footer.site .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px}
@media(max-width:760px){footer.site .cols{grid-template-columns:1fr}}
footer.site h4{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;font-size:.72rem;text-transform:uppercase;
letter-spacing:.12em;color:var(--ink);margin:0 0 12px}
footer.site p{max-width:36ch;margin-top:10px;line-height:1.6}
footer.site a{color:var(--muted);display:block;margin-bottom:8px}
footer.site a:hover{color:var(--brand)}
.disc{font-size:.8rem;line-height:1.65;border-top:1px solid var(--line);
margin-top:var(--s4);padding-top:var(--s3)}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{header.site,footer.site,.related,.pills{display:none}body{background:#fff}}
.hero{background:linear-gradient(165deg,#07203a 0%,#0a2f52 100%);color:#fff;position:relative;
overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
background-image:radial-gradient(rgba(255,255,255,.16) 1px,transparent 1px);
background-size:22px 22px;opacity:.5;
-webkit-mask-image:linear-gradient(105deg,#000 10%,transparent 70%);
mask-image:linear-gradient(105deg,#000 10%,transparent 70%)}
.hero>*{position:relative}
.hero h1,.hero .kicker{color:#fff}
.kicker{font-family:ui-monospace,SFMono-Regular,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace;letter-spacing:.12em;color:#7dd3fc}
.hero .lede{color:rgba(255,255,255,.86)}
.hero .pill{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.26);color:#fff}
.hero .pill:hover{background:#fff;color:var(--brand);border-color:#fff}
.card{border-radius:6px}
.card:hover{border-color:var(--brand2)}
.card .cat,.card .meta{font-family:ui-monospace,SFMono-Regular,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace;font-size:.7rem;letter-spacing:.06em}
.sechead h2{font-size:1.6rem}
.sechead h2::before{content:"// ";font-family:ui-monospace,SFMono-Regular,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace;color:var(--brand2);font-weight:400}