/* ==========================================================================
   SDM article layout — blog posts, glossary terms and the glossary hub.
   Scoped under .ar-page so it cannot leak into the rest of the site.
   ========================================================================== */
.ar-page{--ar-font:'Segoe UI',system-ui,-apple-system,BlinkMacSystemFont,Roboto,'Helvetica Neue',Arial,sans-serif;--ar-mono:Consolas,'Cascadia Mono','SF Mono',Menlo,monospace;--ar-ink:#0f172a;--ar-body:#334155;--ar-muted:#64748b;--ar-line:#e6ecf3;--ar-soft:#f6f8fc;--ar-blue:#1a56db;--ar-blue-2:#2563eb;--ar-sky:#60a5fa;--ar-radius:16px;background:#fff;color:var(--ar-body);font-family:var(--ar-font);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.ar-page h1,.ar-page h2,.ar-page h3,.ar-page p,.ar-page li,.ar-page a,.ar-page summary,.ar-page input,.ar-page button{font-family:var(--ar-font)}
.ar-page *,.ar-page *::before,.ar-page *::after{box-sizing:border-box}

/* reading progress */
.ar-progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,#1a56db,#38bdf8);z-index:1100;transition:width .1s linear}

/* ---------- hero ---------- */
.ar-hero{position:relative;overflow:hidden;padding:132px 5% 64px;color:#fff;isolation:isolate;background:linear-gradient(135deg,#0a0f1e 0%,#0d1b35 55%,#0f2755 100%)}
.ar-hero::before{content:"";position:absolute;inset:0;z-index:-1;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:56px 56px;mask-image:linear-gradient(180deg,#000 30%,transparent);-webkit-mask-image:linear-gradient(180deg,#000 30%,transparent)}
.ar-hero::after{content:"";position:absolute;z-index:-1;width:620px;height:620px;right:-160px;top:-260px;background:radial-gradient(circle,rgba(37,99,235,.35),transparent 65%);pointer-events:none}
.ar-hero-in{position:relative;max-width:1200px;margin:0 auto}
.ar-crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;font-weight:600;color:#94a3b8;margin-bottom:22px}
.ar-crumb a{color:#cbd5e1;text-decoration:none}
.ar-crumb a:hover{color:#fff}
.ar-crumb .sep{opacity:.5}
.ar-kicker{display:inline-flex;align-items:center;gap:8px;font:700 11.5px/1 var(--ar-font);letter-spacing:.14em;text-transform:uppercase;color:var(--ar-sky);background:rgba(96,165,250,.1);border:1px solid rgba(96,165,250,.28);padding:8px 12px;border-radius:999px;margin-bottom:20px}
.ar-kicker::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.ar-title{font-size:clamp(30px,3.6vw,48px);line-height:1.12;font-weight:800;letter-spacing:-.025em;color:#fff;margin:0 0 18px;max-width:30ch;text-wrap:balance}
.ar-dek{font-size:clamp(15.5px,1.3vw,17.5px);line-height:1.75;color:#aab6c8;max-width:66ch;margin:0 0 30px}
.ar-byline{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1)}
.ar-person{display:flex;align-items:center;gap:12px}
.ar-avatar{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:15px;color:#fff;flex-shrink:0;box-shadow:0 0 0 3px rgba(255,255,255,.08)}
.ar-person-name{font-weight:700;color:#fff;font-size:15px;line-height:1.3}
.ar-person-role{font-size:13px;color:#94a3b8}
.ar-facts{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:14px;color:#aab6c8;font-weight:600}
.ar-facts span{display:inline-flex;align-items:center;gap:7px}
.ar-facts svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2;opacity:.8}

/* ---------- layout ---------- */
.ar-shell{max-width:1200px;margin:0 auto;padding:56px 5% 24px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:64px;align-items:start}
.ar-article{min-width:0;max-width:760px}
.ar-aside{position:sticky;top:96px;display:flex;flex-direction:column;gap:18px;max-height:calc(100vh - 112px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;padding-bottom:4px}

/* ---------- summary / definition ---------- */
.ar-summary{position:relative;background:linear-gradient(135deg,#f5f9ff,#fff);border:1px solid #dbe7fb;border-radius:var(--ar-radius);padding:24px 26px 24px 28px;margin:0 0 40px;overflow:hidden}
.ar-summary::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,#1a56db,#38bdf8)}
.ar-label{display:flex;align-items:center;gap:8px;font:700 11.5px/1 var(--ar-font);letter-spacing:.14em;text-transform:uppercase;color:var(--ar-blue);margin-bottom:12px}
.ar-summary p{margin:0;font-size:16.5px;line-height:1.75;color:var(--ar-ink)}
.ar-summary.is-definition p{font-size:18px;line-height:1.7}

.ar-figure{margin:0 0 40px}
.ar-figure img{display:block;width:100%;height:auto;border-radius:var(--ar-radius);box-shadow:0 20px 40px -24px rgba(15,23,42,.35)}

/* ---------- prose ---------- */
.ar-prose{font-size:16.5px;line-height:1.8;color:var(--ar-body)}
.ar-prose > :first-child{margin-top:0}
.ar-prose h2{font-size:clamp(23px,2.2vw,28px);line-height:1.3;font-weight:800;letter-spacing:-.02em;color:var(--ar-ink);margin:56px 0 16px;scroll-margin-top:96px}
.ar-prose h3{font-size:19px;line-height:1.4;font-weight:800;color:var(--ar-ink);margin:34px 0 10px;letter-spacing:-.01em;scroll-margin-top:96px}
.ar-prose p{margin:0 0 20px;text-wrap:pretty}
.ar-prose strong{color:var(--ar-ink);font-weight:700}
.ar-prose a{color:var(--ar-blue);font-weight:600;text-decoration:underline;text-decoration-color:rgba(26,86,219,.3);text-underline-offset:3px;text-decoration-thickness:1.5px}
.ar-prose a:hover{text-decoration-color:var(--ar-blue)}
.ar-prose ul,.ar-prose ol{margin:0 0 24px;padding:0;list-style:none}
.ar-prose li{position:relative;margin:0 0 10px;padding-left:28px}
.ar-prose ul > li::before{content:"";position:absolute;left:6px;top:.72em;width:7px;height:7px;border-radius:50%;background:var(--ar-blue-2);box-shadow:0 0 0 3px rgba(37,99,235,.14)}
.ar-prose ol{counter-reset:ar}
.ar-prose ol > li{counter-increment:ar;padding-left:40px;margin-bottom:12px}
.ar-prose ol > li::before{content:counter(ar);position:absolute;left:0;top:.15em;width:26px;height:26px;border-radius:50%;background:#eef4ff;color:var(--ar-blue);font-size:13px;font-weight:800;display:grid;place-items:center;line-height:26px;text-align:center}
.ar-prose code{font-family:var(--ar-mono);font-size:.88em;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:6px;padding:2px 6px;color:var(--ar-ink);word-break:break-word}
.ar-prose blockquote{margin:28px 0;padding:6px 0 6px 22px;border-left:3px solid var(--ar-blue-2);color:var(--ar-ink);font-size:18px;font-style:italic}
.ar-prose img{max-width:100%;height:auto;border-radius:12px}
.ar-prose hr{border:0;border-top:1px solid var(--ar-line);margin:40px 0}
.ar-prose .b-alert,.ar-callout{background:#f5f9ff;border:1px solid #dbe7fb;border-radius:12px;padding:18px 20px;margin:0 0 24px;color:var(--ar-ink)}
.ar-prose .b-alert p:last-child{margin-bottom:0}

/* tables */
.ar-table{margin:8px 0 28px;border:1px solid var(--ar-line);border-radius:14px;overflow-x:auto;-webkit-overflow-scrolling:touch;background:#fff}
.ar-prose .ar-table table{display:table;width:100%;min-width:560px;border-collapse:collapse;margin:0;background:#fff;box-shadow:none;border-radius:0;font-size:15px;font-family:var(--ar-font)}
.ar-prose .ar-table th{background:var(--ar-ink);color:#fff;text-align:left;text-transform:none;letter-spacing:0;font-size:13.5px;font-weight:700;padding:13px 16px;border:0;vertical-align:bottom;font-family:var(--ar-font)}
.ar-prose .ar-table td{text-align:left;font-family:var(--ar-font);font-size:15px;padding:13px 16px;border:0;border-top:1px solid #eef2f7;vertical-align:top;color:var(--ar-body);line-height:1.6}
.ar-prose .ar-table tr:nth-child(even) td{background:#fafcff}
.ar-prose .ar-table td:first-child{color:var(--ar-ink);font-weight:600}

/* FAQ */
.ar-faq{margin:0 0 12px;border-top:1px solid var(--ar-line)}
.ar-faq details{border-bottom:1px solid var(--ar-line)}
.ar-faq summary{list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding:20px 2px;font-size:17px;font-weight:700;color:var(--ar-ink);line-height:1.45}
.ar-faq summary::-webkit-details-marker{display:none}
.ar-faq summary::after{content:"";flex-shrink:0;width:26px;height:26px;margin-top:1px;border-radius:50%;background:#eef4ff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231a56db' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M12 5v14M5 12h14'/%3E%3C/svg%3E") center/13px no-repeat;transition:transform .25s ease}
.ar-faq details[open] summary::after{transform:rotate(45deg)}
.ar-faq summary:hover{color:var(--ar-blue)}
.ar-faq .ar-faq-a{padding:0 44px 20px 2px}
.ar-faq .ar-faq-a p{margin:0;font-size:16px}

/* in-article CTA */
.ar-cta{position:relative;overflow:hidden;margin:48px 0 0;padding:34px 34px 32px;border-radius:20px;background:linear-gradient(135deg,#0a0f1e 0%,#0d1b35 55%,#0f2755 100%);color:#cbd5e1}
.ar-cta::after{content:"";position:absolute;width:360px;height:360px;right:-120px;top:-160px;background:radial-gradient(circle,rgba(56,189,248,.28),transparent 65%)}
.ar-cta > *{position:relative;z-index:1}
.ar-cta .ar-label{color:var(--ar-sky)}
.ar-cta h2{font-size:clamp(21px,2vw,26px);line-height:1.25;font-weight:800;color:#fff;margin:0 0 10px;letter-spacing:-.02em}
.ar-cta p{margin:0 0 22px;font-size:16px;line-height:1.7;color:#aab6c8;max-width:56ch}
.ar-btns{display:flex;flex-wrap:wrap;gap:12px}
.ar-btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:10px;font-weight:700;font-size:14.5px;font-family:var(--ar-font);line-height:1.2;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}
.ar-btn-primary{background:linear-gradient(100deg,#1d4ed8,#2563eb);color:#fff;box-shadow:0 12px 26px -10px rgba(37,99,235,.7)}
.ar-btn-primary:hover{transform:translateY(-2px);color:#fff}
.ar-btn-ghost{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.2);color:#e2e8f0}
.ar-btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff}

/* author box */
.ar-author{display:flex;gap:18px;align-items:center;margin:32px 0 0;padding:22px 24px;border:1px solid var(--ar-line);border-radius:var(--ar-radius);background:var(--ar-soft)}
.ar-author .ar-avatar{width:56px;height:56px;font-size:18px;box-shadow:none}
.ar-author-k{font:700 11px/1 var(--ar-font);letter-spacing:.14em;text-transform:uppercase;color:var(--ar-muted);margin-bottom:6px}
.ar-author-n{font-size:17px;font-weight:800;color:var(--ar-ink)}
.ar-author-r{font-size:14.5px;color:var(--ar-muted)}
.ar-author a{color:var(--ar-blue);font-weight:600;text-decoration:none;font-size:14px}

/* ---------- sidebar ---------- */
.ar-card{background:#fff;border:1px solid var(--ar-line);border-radius:var(--ar-radius);padding:20px}
.ar-card-h{font:700 11.5px/1 var(--ar-font);letter-spacing:.14em;text-transform:uppercase;color:var(--ar-muted);margin:0 0 14px}
.ar-toc ol{list-style:none;margin:0;padding:0;counter-reset:toc;max-height:calc(100vh - 360px);overflow:auto}
.ar-toc li{margin:0}
.ar-toc a{display:block;padding:7px 0 7px 14px;border-left:2px solid var(--ar-line);color:var(--ar-muted);font-size:14px;line-height:1.45;font-weight:600;text-decoration:none;transition:color .15s,border-color .15s}
.ar-toc a:hover{color:var(--ar-ink)}
.ar-toc a.is-active{color:var(--ar-blue);border-left-color:var(--ar-blue)}
.ar-side-cta{background:linear-gradient(160deg,#0d1b35,#0f2755);border:0;color:#aab6c8}
.ar-side-cta .ar-card-h{color:var(--ar-sky)}
.ar-side-cta strong{display:block;color:#fff;font-size:18px;line-height:1.35;margin-bottom:8px}
.ar-side-cta p{font-size:14px;line-height:1.6;margin:0 0 16px}
.ar-side-cta .ar-btn{width:100%;justify-content:center}
.ar-links{list-style:none;margin:0;padding:0}
.ar-links li{border-top:1px solid #eef2f7}
.ar-links li:first-child{border-top:0}
.ar-links a{display:flex;justify-content:space-between;gap:10px;padding:10px 0;color:var(--ar-ink);font-size:14.5px;font-weight:600;text-decoration:none}
.ar-links a:hover{color:var(--ar-blue)}
.ar-links a::after{content:"→";color:#94a3b8}

/* mobile TOC */
.ar-toc-m{display:none;margin:0 0 32px;border:1px solid var(--ar-line);border-radius:14px;background:var(--ar-soft)}
.ar-toc-m summary{cursor:pointer;list-style:none;padding:15px 18px;font-weight:700;color:var(--ar-ink);display:flex;justify-content:space-between}
.ar-toc-m summary::-webkit-details-marker{display:none}
.ar-toc-m summary::after{content:"▾";color:var(--ar-muted)}
.ar-toc-m[open] summary::after{content:"▴"}
.ar-toc-m ol{margin:0;padding:0 18px 14px 36px;color:var(--ar-muted)}
.ar-toc-m li{padding:4px 0}
.ar-toc-m a{color:var(--ar-body);text-decoration:none;font-size:15px}

/* ---------- related ---------- */
.ar-more{background:var(--ar-soft);border-top:1px solid var(--ar-line);padding:64px 5% 72px;margin-top:48px}
.ar-more-in{max-width:1200px;margin:0 auto}
.ar-more-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px;margin-bottom:26px}
.ar-more-head h2{font-size:clamp(23px,2.2vw,28px);font-weight:800;color:var(--ar-ink);margin:0;letter-spacing:-.02em;line-height:1.2}
.ar-more-head a{color:var(--ar-blue);font-weight:700;text-decoration:none;font-size:15px}
.ar-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.ar-tile{display:flex;flex-direction:column;gap:12px;min-height:170px;padding:22px;background:#fff;border:1px solid var(--ar-line);border-radius:var(--ar-radius);text-decoration:none;transition:transform .25s cubic-bezier(.22,1,.36,1),box-shadow .25s,border-color .25s}
.ar-tile:hover{transform:translateY(-4px);border-color:rgba(37,99,235,.3);box-shadow:0 18px 36px -22px rgba(15,23,42,.35)}
.ar-tile-tag{font:700 11px/1 var(--ar-font);letter-spacing:.14em;text-transform:uppercase;color:var(--ar-blue)}
.ar-tile-t{font-size:17px;line-height:1.4;font-weight:800;color:var(--ar-ink);letter-spacing:-.01em}
.ar-tile-d{font-size:14.5px;line-height:1.6;color:var(--ar-muted)}
.ar-tile-go{margin-top:auto;font-size:14px;font-weight:700;color:var(--ar-blue)}

/* ---------- glossary hub ---------- */
.gl-search{position:relative;max-width:620px;margin:0 0 22px}
.gl-search input{width:100%;height:58px;border-radius:14px;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.07);color:#fff;font-family:var(--ar-font);font-size:16px;padding:0 20px 0 52px;outline:none;transition:border-color .2s,background .2s}
.gl-search input::placeholder{color:#8fa0b8}
.gl-search input:focus{border-color:var(--ar-sky);background:rgba(255,255,255,.1)}
.gl-search svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:20px;height:20px;stroke:#8fa0b8;fill:none;stroke-width:2}
.gl-stats{display:flex;flex-wrap:wrap;gap:10px}
.gl-stat{font-size:13.5px;font-weight:600;color:#cbd5e1;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:999px;padding:7px 14px}
.gl-bar{position:sticky;top:70px;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--ar-line)}
.gl-bar-in{max-width:1200px;margin:0 auto;padding:12px 5%;display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}
.gl-bar-in::-webkit-scrollbar{display:none}
.gl-chip{flex-shrink:0;display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;border:1px solid var(--ar-line);background:#fff;color:var(--ar-body);font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap}
.gl-chip b{font-size:12px;color:var(--ar-muted);font-weight:700}
.gl-chip:hover{border-color:rgba(37,99,235,.35);color:var(--ar-blue)}
.gl-body{max-width:1200px;margin:0 auto;padding:48px 5% 24px}
.gl-sec{margin:0 0 52px;scroll-margin-top:140px}
.gl-sec-h{display:flex;align-items:baseline;gap:12px;margin:0 0 20px;padding-bottom:14px;border-bottom:1px solid var(--ar-line)}
.gl-sec-h h2{font-size:clamp(22px,2vw,26px);font-weight:800;color:var(--ar-ink);margin:0;letter-spacing:-.02em;line-height:1.2}
.gl-sec-h span{font-size:14px;color:var(--ar-muted);font-weight:600}
.gl-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.gl-card{display:flex;flex-direction:column;gap:10px;padding:22px;background:#fff;border:1px solid var(--ar-line);border-radius:var(--ar-radius);text-decoration:none;transition:transform .25s cubic-bezier(.22,1,.36,1),box-shadow .25s,border-color .25s}
.gl-card:hover{transform:translateY(-3px);border-color:rgba(37,99,235,.3);box-shadow:0 16px 32px -22px rgba(15,23,42,.35)}
.gl-card-t{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:800;color:var(--ar-ink);line-height:1.35}
.gl-letter{flex-shrink:0;width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:#eef4ff;color:var(--ar-blue);font-weight:800;font-size:15px}
.gl-card-d{font-size:15px;line-height:1.65;color:var(--ar-muted);margin:0}
.gl-card-go{margin-top:auto;padding-top:4px;font-size:14px;font-weight:700;color:var(--ar-blue)}
.gl-empty{display:none;text-align:center;padding:56px 20px;border:1px dashed #cbd5e1;border-radius:var(--ar-radius);color:var(--ar-muted);font-size:16px}
.gl-band{max-width:1200px;margin:8px auto 72px;padding:0 5%}
.gl-band .ar-cta{margin:0;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px 40px;padding:38px 40px}
.gl-band .ar-cta p{margin:0}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .ar-shell{grid-template-columns:minmax(0,1fr);gap:0;padding-top:40px}
  .ar-article{max-width:none}
  .ar-aside{display:none}
  .ar-toc-m{display:block}
  .ar-grid,.gl-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .ar-hero{padding:108px 16px 44px}
  .ar-shell{padding:32px 16px 16px}
  .ar-prose{font-size:16px}
  .ar-title{font-size:30px}
  .ar-prose h2{font-size:22px}
  .ar-prose h2{margin-top:44px}
  .ar-summary{padding:20px 18px 20px 22px}
  .ar-summary.is-definition p{font-size:17px}
  .ar-cta{padding:26px 22px}
  .ar-faq summary{font-size:16.5px}
  .ar-faq .ar-faq-a{padding-right:0}
  .ar-grid,.gl-grid{grid-template-columns:minmax(0,1fr)}
  .ar-more{padding:48px 16px 56px}
  .gl-body{padding:32px 16px 16px}
  .gl-bar-in{padding:10px 16px}
  .gl-band{padding:0 16px}
  .gl-band .ar-cta{padding:28px 22px}
  .ar-author{align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){.ar-page *{transition:none!important}}