:root{
  --bg:#F7F7FB; --surface:#FFFFFF; --soft:#EEF0FA; --soft2:#F3F0FF;
  --line:#E4E6EF; --line2:#D6D9E6;
  --text:#16171D; --muted:#555A6C; --dim:#6B7080;
  --indigo:#5E6AD2; --indigoD:#4B55B8; --violet:#8B5CF6; --coral:#E0533F; --amber:#B4600A; --blue:#2F6DC4;
  --grad:linear-gradient(90deg,#5E6AD2,#8B5CF6 45%,#F26B5B);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{background:var(--bg);color:var(--text);font-family:Heebo,system-ui,sans-serif;font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
:focus-visible{outline:2px solid var(--indigo);outline-offset:3px;border-radius:8px}
.mono{font-family:"JetBrains Mono",monospace;direction:ltr;unicode-bidi:isolate}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:760px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;top:-60px;right:16px;z-index:60;background:var(--text);color:#fff;padding:8px 14px;border-radius:8px}
.skip:focus{top:12px}

/* header (shared with main site) */
header{position:sticky;top:0;z-index:30;background:rgba(247,247,251,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.nav .r{display:flex;align-items:center;gap:36px}
.brand{display:flex;align-items:center;gap:9px;direction:ltr;font-weight:700;font-size:16px;padding:8px 0}
.nav ul{display:flex;gap:24px;list-style:none;font-size:14px;color:var(--muted)}
.nav ul a{position:relative;padding:6px 0;white-space:nowrap}
.nav ul a:hover,.nav ul a.cur{color:var(--text)}
.nav ul a.cur:after{content:"";position:absolute;bottom:-2px;right:0;left:0;height:2px;border-radius:2px;background:var(--indigo)}
.nav .l{display:flex;gap:12px;align-items:center;font-size:14px}
.nav .login{color:var(--muted);padding:8px 4px}

.pill{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border-radius:9999px;font-size:15px;font-weight:600;transition:.2s;white-space:nowrap;border:0;font-family:inherit;cursor:pointer}
.pill.pr{background:var(--indigo);color:#fff;box-shadow:0 6px 18px rgba(94,106,210,.3)}
.pill.pr:hover{background:var(--indigoD);transform:translateY(-1px)}
.pill.gh{background:var(--surface);border:1px solid var(--line2);color:var(--text)}
.pill.sm{min-height:38px;padding:0 16px;font-size:14px}

/* breadcrumb */
.crumb{font-size:13px;color:var(--dim);display:flex;gap:8px;align-items:center;margin:28px 0 18px}
.crumb a:hover{color:var(--text)}

/* blog hub hero */
.blog-hero{padding:20px 0 40px}
.blog-hero .eyebrow{font-size:13px;color:var(--indigoD);font-weight:600;margin-bottom:10px}
.blog-hero h1{font-size:clamp(32px,4.4vw,52px);font-weight:700;letter-spacing:-.03em;line-height:1.08;max-width:820px}
.blog-hero p{color:var(--muted);font-size:18px;max-width:620px;margin-top:14px}

/* article cards grid */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:10px 0 80px}
.bcard{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s,border-color .25s}
.bcard:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(40,44,90,.09);border-color:var(--line2)}
.bcard .tag{font-size:12px;font-weight:600;color:var(--indigoD);background:var(--soft);border-radius:99px;padding:2px 10px;width:fit-content;margin-bottom:14px}
.bcard h3{font-size:19px;font-weight:700;line-height:1.3;letter-spacing:-.01em}
.bcard p{color:var(--muted);font-size:14px;margin-top:8px;flex:1}
.bcard .meta{display:flex;justify-content:space-between;align-items:center;margin-top:16px;font-size:12px;color:var(--dim);border-top:1px solid var(--line);padding-top:12px}
.bcard.feat{grid-column:span 2;grid-row:span 1;background:linear-gradient(160deg,#fff 45%,var(--soft));border-color:var(--line2)}
.bcard.feat h3{font-size:26px}

/* article page */
.article-hero{padding:8px 0 20px}
.article-hero .eyebrow{font-size:13px;color:var(--indigoD);font-weight:600;margin-bottom:12px;display:flex;gap:8px;align-items:center}
.article-hero h1{font-size:clamp(30px,4.6vw,48px);font-weight:700;letter-spacing:-.025em;line-height:1.14;max-width:880px}
.article-hero .dek{color:var(--muted);font-size:19px;max-width:680px;margin-top:16px}
.article-meta{display:flex;gap:18px;align-items:center;margin-top:24px;font-size:13px;color:var(--dim);flex-wrap:wrap}
.article-meta .av{width:28px;height:28px;border-radius:50%;background:var(--grad)}

.article-body{max-width:720px;margin:40px auto 0;font-size:17px;line-height:1.85;color:#2A2C38}
.article-body h2{font-size:clamp(23px,2.6vw,28px);font-weight:700;letter-spacing:-.015em;margin:48px 0 16px;color:var(--text)}
.article-body h2 .n{color:var(--indigo);font-family:"JetBrains Mono",monospace;font-size:15px;margin-inline-end:10px}
.article-body p{margin-bottom:20px}
.article-body ul,.article-body ol{margin:0 0 20px;padding-inline-start:22px}
.article-body li{margin-bottom:8px}
.article-body strong{color:var(--text);font-weight:700}
.article-body a.inline{color:var(--indigoD);text-decoration:underline;text-decoration-color:var(--line2);text-underline-offset:3px}

.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0 36px}
.stat-box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center}
.stat-box b{display:block;font-size:30px;font-weight:700;letter-spacing:-.02em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-box span{font-size:13px;color:var(--muted)}

.callout{border-inline-start:3px solid var(--indigo);background:var(--soft);border-radius:0 12px 12px 0;padding:18px 22px;margin:28px 0;font-size:16px;color:#2A2C38}
.callout b{color:var(--text)}
.callout.warn{border-color:var(--coral);background:#FDF1EF}

blockquote{border-inline-start:3px solid var(--line2);padding-inline-start:18px;color:var(--muted);font-style:normal;margin:24px 0}

.cta-box{background:linear-gradient(160deg,#fff 40%,var(--soft));border:1px solid var(--line2);border-radius:20px;padding:30px 32px;margin:44px auto;max-width:720px;text-align:center}
.cta-box h3{font-size:22px;font-weight:700;margin-bottom:10px}
.cta-box p{color:var(--muted);margin-bottom:20px}

.faq{max-width:720px;margin:0 auto}
.faq details{border:1px solid var(--line);border-radius:14px;padding:4px 20px;margin-bottom:10px;background:var(--surface)}
.faq summary{cursor:pointer;font-weight:600;font-size:16px;padding:16px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";font-size:22px;color:var(--indigo);flex:none;transition:.2s}
.faq details[open] summary:after{content:"−"}
.faq details p{color:var(--muted);padding-bottom:16px;margin:0}

.sources{max-width:720px;margin:40px auto 0;padding-top:28px;border-top:1px solid var(--line);font-size:13px;color:var(--dim)}
.sources h4{font-size:13px;color:var(--dim);margin-bottom:12px;font-weight:600}
.sources ol{padding-inline-start:18px;display:grid;gap:6px}
.sources a{color:var(--indigoD)}
.note{font-size:13px;color:var(--amber);background:#FFF4E8;border:1px solid #F6DDBF;border-radius:10px;padding:10px 14px;margin-top:16px}

.related{padding:60px 0 90px;border-top:1px solid var(--line);margin-top:50px;background:var(--surface)}
.related h3{font-size:14px;color:var(--dim);font-weight:600;margin-bottom:20px;text-align:center}

footer{background:var(--surface);border-top:1px solid var(--line);padding:50px 0 24px;margin-top:0}
.fc{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:24px;font-size:14px;color:var(--muted)}
.fc h3{font-size:13px;color:var(--text);margin-bottom:12px}
.fc a{display:block;margin-bottom:8px;color:var(--muted)}
.fc a:hover{color:var(--text)}
.flegal{display:flex;justify-content:space-between;margin-top:36px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--dim)}
.flegal nav{display:flex;gap:16px}

@media (max-width:860px){
  .blog-grid{grid-template-columns:1fr}
  .bcard.feat{grid-column:span 1}
  .stat-row{grid-template-columns:1fr}
  .fc{grid-template-columns:1fr 1fr}
  .nav ul{display:none}
}