:root{--bg:#fff;--bg2:#f4f6fb;--text:#1a1d2b;--muted:#4a5068;--line:#dfe3ee;--brand:#0b4fd4;--brand-d:#0a3fa8;--navy:#0b1220;--tip:#e8f4ec;--tip-b:#1a7f4b;--warn:#fdf1e3;--warn-b:#b45309;--card:#fff;--shadow:0 1px 3px rgba(11,18,32,.08),0 4px 14px rgba(11,18,32,.06)}
@media(prefers-color-scheme:dark){:root{--bg:#0e1322;--bg2:#151b2e;--text:#e8ebf5;--muted:#aab1c8;--line:#273049;--brand:#7aa7ff;--brand-d:#a8c4ff;--navy:#070b16;--tip:#10281d;--tip-b:#4cc38a;--warn:#2b1d0c;--warn-b:#f0a04b;--card:#151b2e;--shadow:none}}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
a{color:var(--brand);text-underline-offset:2px}
a:hover{color:var(--brand-d)}
:focus-visible{outline:3px solid #f5a623;outline-offset:2px;border-radius:3px}
.skip{position:absolute;left:-999px;top:0;background:#000;color:#fff;padding:10px 14px;z-index:10}
.skip:focus{left:8px;top:8px}
header.site{background:var(--navy);color:#fff}
header.site .in{max-width:1080px;margin:0 auto;padding:12px 18px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;font-size:19px;letter-spacing:.01em}
.logo:hover{color:#fff}
.logo svg{width:30px;height:30px}
nav.main{display:flex;flex-wrap:wrap;gap:4px 16px;font-size:15px}
nav.main a{color:#dfe6f7;text-decoration:none;padding:4px 0}
nav.main a:hover,nav.main a[aria-current=page]{color:#fff;text-decoration:underline}
main{max-width:1080px;margin:0 auto;padding:24px 18px 60px}
.crumbs{font-size:14px;color:var(--muted);margin:0 0 14px}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--muted)}
.crumbs a{color:var(--muted)}
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:28px}
@media(min-width:980px){.layout.has-toc{grid-template-columns:minmax(0,720px) 270px;justify-content:center}}
article.post{min-width:0}
h1{font-size:clamp(28px,4.6vw,40px);line-height:1.2;margin:.2em 0 .4em;letter-spacing:-.01em}
h2{font-size:clamp(22px,3.2vw,28px);line-height:1.25;margin:1.9em 0 .5em;padding-top:.2em;scroll-margin-top:16px}
h3{font-size:20px;line-height:1.3;margin:1.5em 0 .4em;scroll-margin-top:16px}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.2em;padding-left:1.3em}
li{margin:.3em 0}
.meta{color:var(--muted);font-size:14.5px;display:flex;flex-wrap:wrap;gap:4px 14px;margin:0 0 18px}
.lede{font-size:19px;color:var(--text)}
.takeaways{background:var(--bg2);border:1px solid var(--line);border-left:5px solid var(--brand);border-radius:10px;padding:14px 20px;margin:22px 0}
.takeaways h2{margin:0 0 .3em;font-size:20px;padding:0}
.takeaways ul{margin:0}
.callout{border-radius:10px;padding:12px 16px;margin:1.2em 0;border-left:5px solid;font-size:16.5px}
.callout.tip{background:var(--tip);border-color:var(--tip-b)}
.callout.warning{background:var(--warn);border-color:var(--warn-b)}
.table-wrap{overflow-x:auto;margin:1.2em 0;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:15.5px;min-width:480px}
th,td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--bg2);font-weight:700}
tr:last-child td{border-bottom:0}
figure.diagram{margin:1.6em 0;background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:14px}
figure.diagram svg{display:block;margin:0 auto;max-width:560px;width:100%}
figure.diagram figcaption{font-size:14.5px;color:var(--muted);text-align:center;margin-top:8px}
aside.toc{font-size:15px;border:1px solid var(--line);border-radius:12px;padding:14px 18px;background:var(--card);align-self:start}
aside.toc h2{font-size:16px;margin:0 0 .4em;padding:0}
aside.toc ol{margin:0;padding-left:1.1em}
@media(min-width:980px){aside.toc{position:sticky;top:16px;order:2}}
.spotlight{margin:2.2em 0 1em;border:1px solid var(--line);border-radius:14px;padding:18px 20px;background:var(--card);box-shadow:var(--shadow)}
.spotlight h2{margin:.1em 0 .3em;font-size:21px;padding:0}
.spotlight .btn{display:inline-block;background:var(--brand);color:#fff;padding:10px 18px;border-radius:10px;text-decoration:none;font-weight:700;margin:4px 0 8px}
.spotlight .btn:hover{background:var(--brand-d);color:#fff}
.spotlight small{display:block;color:var(--muted);font-size:13.5px;line-height:1.5}
.related h2{margin-top:1.6em}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;list-style:none;margin:0;padding:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow);height:100%}
.card a{text-decoration:none;color:var(--text);font-weight:700;line-height:1.35;display:block}
.card a:hover{color:var(--brand)}
.card p{color:var(--muted);font-size:14.5px;line-height:1.5;margin:.5em 0 0}
.card .tag{font-size:12px;text-transform:uppercase;letter-spacing:.07em;color:var(--brand);font-weight:700}
.hero{background:linear-gradient(135deg,var(--navy),#16306b);color:#fff;border-radius:16px;padding:30px 24px;margin:0 0 30px}
.hero h1{color:#fff;margin:0 0 .3em}
.hero p{color:#dfe6f7;font-size:18px;max-width:46em;margin:0 0 .8em}
.hero .btn{display:inline-block;background:#fff;color:#0b1220;padding:11px 20px;border-radius:10px;text-decoration:none;font-weight:800}
.hero .btn:hover{background:#e8eefc;color:#0b1220}
.pn{display:grid;gap:12px;grid-template-columns:1fr;margin:2em 0 0}
@media(min-width:640px){.pn{grid-template-columns:1fr 1fr}}
.pn a{display:block;border:1px solid var(--line);border-radius:12px;padding:12px 16px;text-decoration:none;background:var(--card)}
.pn small{display:block;color:var(--muted)}
.pn .next{text-align:right}
footer.site{background:var(--navy);color:#c9d2ea;font-size:14.5px}
footer.site .in{max-width:1080px;margin:0 auto;padding:28px 18px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
footer.site a{color:#dfe6f7}
footer.site h2{font-size:15px;color:#fff;margin:0 0 .5em;padding:0;text-transform:uppercase;letter-spacing:.06em}
footer.site ul{list-style:none;margin:0;padding:0}
footer.site li{margin:.25em 0}
footer.site .fine{grid-column:1/-1;border-top:1px solid #243153;padding-top:14px;font-size:13.5px;color:#a9b4d2}
.az{columns:2;column-gap:24px}
@media(max-width:560px){.az{columns:1}}
@media print{header.site,footer.site,aside.toc,.spotlight,.related,.pn,.crumbs{display:none}body{font-size:12pt}a{color:#000}}
@media(prefers-color-scheme:dark){.spotlight .btn,.spotlight .btn:hover{color:#0b1220}}