:root{
  color-scheme:light;
  --ink:#10192d;
  --ink-soft:#293550;
  --muted:#657187;
  --paper:#f7f8fb;
  --surface:#ffffff;
  --line:#dfe3eb;
  --blue:#335cff;
  --blue-deep:#2748cf;
  --blue-soft:#e9edff;
  --yellow:#ffd75a;
  --yellow-soft:#fff6d6;
  --mint:#56c9a5;
  --serif:'Iowan Old Style','Palatino Linotype',Palatino,Georgia,serif;
  --sans:'Avenir Next',Avenir,ui-sans-serif,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;
}

html[data-theme="dark"]{
  color-scheme:dark;
  --ink:#eef3ff;
  --ink-soft:#cbd4e7;
  --muted:#9ba8bf;
  --paper:#090f1d;
  --surface:#111a2b;
  --line:#2a3650;
  --blue:#8aa2ff;
  --blue-deep:#a5b7ff;
  --blue-soft:#1b2a55;
  --yellow-soft:#332b16;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:3px solid var(--yellow);outline-offset:4px}
.skip{position:absolute;left:16px;top:-80px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:0 0 8px 8px;z-index:10}
.skip:focus{top:0}
.shell{width:min(1120px,calc(100% - 36px));margin-inline:auto}
.top{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:20px;letter-spacing:-.04em}
.brand-word span{color:var(--blue)}
.mark{width:34px;height:34px;border-radius:11px;background:url('../favicon.svg?v=rolebyrole-1') center/cover no-repeat;flex:none}
.top nav{display:flex;gap:18px;align-items:center}
.top nav a{text-decoration:none;font-size:11px;font-weight:800}
.top .cta{background:var(--ink);color:#fff;padding:10px 13px;border-radius:10px}
.theme-toggle{display:inline-grid;place-items:center;width:36px;height:36px;flex:none;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);font:700 17px/1 var(--sans);cursor:pointer}
.theme-toggle:hover{border-color:var(--blue)}
.theme-toggle:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}
.crumbs{padding-top:24px;font:600 10px var(--mono);color:var(--muted)}
.crumbs a{color:var(--blue);text-decoration:none}
.eyebrow{font:600 10px var(--mono);text-transform:uppercase;letter-spacing:.13em;color:var(--blue);margin:0 0 14px}
.blog-hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(260px,.6fr);gap:48px;padding:70px 0 58px;align-items:end}
.blog-hero h1,.article-hero h1{font:600 clamp(48px,8vw,92px)/.89 var(--serif);letter-spacing:-.065em;margin:0 0 22px}
.blog-hero .lede,.article-hero .lede{max-width:760px;color:var(--muted);font-size:16px;line-height:1.7;margin:0}
.signal-card{background:var(--yellow-soft);border:1px solid #ead783;border-radius:20px;padding:24px;transform:rotate(1deg)}
.signal-card small{font:600 9px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:#816313}
.signal-card strong{display:block;font:600 30px/1.05 var(--serif);margin:28px 0 10px}
.signal-card p{font-size:11px;line-height:1.65;color:var(--muted);margin:0}
.feature{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(260px,.75fr);background:var(--surface);border:1px solid var(--line);border-radius:22px;overflow:hidden;margin-bottom:24px}
.feature-main{padding:clamp(28px,5vw,54px)}
.feature-side{background:var(--blue-soft);padding:clamp(28px,4vw,42px);display:flex;flex-direction:column;justify-content:space-between}
.kicker{font:600 9px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--blue)}
.feature h2,.section-title{font:600 clamp(32px,4.6vw,54px)/.97 var(--serif);letter-spacing:-.045em;margin:14px 0}
.feature p,.feature-side p{font-size:13px;line-height:1.75;color:var(--muted)}
.button{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;padding:13px 17px;border-radius:10px;font-size:12px;font-weight:800;margin-top:14px}
.button:hover{background:var(--blue-deep)}
.feature-side .stat{font:600 38px/1 var(--serif);color:var(--ink)}
.feature-side .stat-label{font:600 9px var(--mono);text-transform:uppercase;letter-spacing:.09em;color:var(--blue);margin-top:8px}
.blog-section{padding:40px 0 70px}
.section-intro{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:20px}
.section-intro p{max-width:500px;color:var(--muted);font-size:12px;line-height:1.7}
.posts{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.posts-four{grid-template-columns:repeat(2,1fr)}
.post-card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:23px;min-height:250px;display:flex;flex-direction:column;text-decoration:none;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.post-card:hover{transform:translateY(-3px);border-color:#bdc6d8;box-shadow:0 20px 45px rgba(20,32,57,.08)}
.post-card h3{font:600 27px/1.04 var(--serif);letter-spacing:-.03em;margin:23px 0 10px}
.post-card p{color:var(--muted);font-size:11px;line-height:1.65}
.post-card .meta{margin-top:auto;padding-top:22px;font:600 9px var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--blue)}
.post-card.placeholder{background:transparent;border-style:dashed;color:var(--muted)}
.article-hero{padding:58px 0 42px;max-width:980px}
.article-hero h1{font-size:clamp(48px,7vw,82px)}
.byline{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:25px;color:var(--muted);font:600 10px var(--mono)}
.article-layout{display:grid;grid-template-columns:235px minmax(0,720px);justify-content:center;gap:56px;padding:24px 0 80px}
.toc{height:max-content;position:sticky;top:24px;border-left:3px solid var(--blue);padding:2px 0 2px 16px}
.toc strong{display:block;font:700 9px var(--mono);text-transform:uppercase;letter-spacing:.09em;margin-bottom:12px}
.toc a{display:block;color:var(--muted);font-size:10px;line-height:1.45;text-decoration:none;margin:11px 0}
.toc a:hover{color:var(--blue)}
.article{min-width:0}
.article section{scroll-margin-top:24px;margin-bottom:42px}
.article h2{font:600 38px/1.05 var(--serif);letter-spacing:-.04em;margin:0 0 16px}
.article h3{font-size:17px;letter-spacing:-.02em;margin:28px 0 9px}
.article p,.article li{color:var(--ink-soft);font-size:15px;line-height:1.82}
.article li+li{margin-top:8px}
.article a{color:var(--blue);text-underline-offset:3px}
.article table{width:100%;border-collapse:separate;border-spacing:0;margin:24px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--surface);font-size:13px}
.article th,.article td{padding:13px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.article th{background:var(--blue-soft);font-size:11px}.article tr:last-child td{border-bottom:0}
.callout{background:var(--blue-soft);border:1px solid #cdd5ff;border-radius:18px;padding:24px;margin:28px 0}
.callout.yellow{background:var(--yellow-soft);border-color:#ead783}
.callout p:last-child{margin-bottom:0}
.worksheet{background:var(--ink);color:#fff;border-radius:18px;padding:26px;margin:28px 0}
.worksheet h3{margin-top:0;color:#fff}
.worksheet p,.worksheet li{color:#d8ddeb}
.source-list{font-size:13px!important}
.disclosure{border-top:1px solid var(--line);padding-top:22px;font-size:12px!important;color:var(--muted)!important}
footer{border-top:1px solid var(--line);padding:28px 0 50px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:10px}
footer a{color:var(--ink-soft);font-weight:700;text-decoration:none}

html[data-theme="dark"] .top .cta{background:#eef3ff;color:#10192d}
html[data-theme="dark"] .signal-card{border-color:#69591f}
html[data-theme="dark"] .signal-card small{color:#f0d474}
html[data-theme="dark"] .post-card:hover{border-color:#485774;box-shadow:none}
html[data-theme="dark"] .button{color:#0b1220}
html[data-theme="dark"] .worksheet{background:#07101f}
html[data-theme="dark"] .skip{background:#eef3ff;color:#10192d}

@media(max-width:820px){
  .blog-hero,.feature,.article-layout{grid-template-columns:1fr}
  .article-layout{gap:22px}
  .toc{position:static}
  .signal-card{transform:none}
  .posts{grid-template-columns:1fr 1fr}
}
@media(max-width:580px){
  .top nav a:not(.cta){display:none}
  .blog-hero{padding-top:48px}
  .posts{grid-template-columns:1fr}
  .section-intro{display:block}
  .article table{display:block;overflow-x:auto}
  footer{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.post-card{transition:none}}
@media print{.top nav,.toc,.button,.skip{display:none}.article-layout{display:block}.article{max-width:none}body{background:#fff}.article p,.article li{color:#111}}