/* Metro Fabric blog (v4) — shares the landing brandbook */
:root{
  --blue:#0ea5e9; --blue-light:#38bdf8; --blue-mid:#0284c7; --blue-dark:#0369a1;
  --blue-bg:#f0f9ff; --blue-bdr:rgba(14,165,233,.2); --blue-glow:rgba(14,165,233,.25);
  --green:#22c55e; --green-bg:#f0fdf4; --green-bdr:rgba(34,197,94,.22);
  --heading:#09090b; --body:#27272a; --muted:#71717a; --dim:#a1a1aa;
  --border:#e4e4e7; --border-mid:#d4d4d8; --light:#f4f4f5; --off:#fafafa; --white:#fff; --navy:#0b1424;
  --radius:8px; --radius-lg:12px;
  --shadow:0 1px 3px rgba(9,9,11,.06),0 1px 2px rgba(9,9,11,.04);
  --shadow-md:0 4px 16px rgba(9,9,11,.07),0 2px 6px rgba(9,9,11,.04);
  --sans:"Geist",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --mono:"Geist Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1160px; --gutter:clamp(20px,5vw,44px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--body);background:var(--white);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;min-height:100vh;display:flex;flex-direction:column}
body>main{flex:1 0 auto}
h1,h2,h3,h4{color:var(--heading);line-height:1.14;letter-spacing:-.02em;text-wrap:balance;font-weight:600}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.label{font-family:var(--mono);font-size:11.5px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.label.blue{color:var(--blue-dark)}

/* ---- header ---- */
.mark{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5px;width:22px;height:22px;flex:none}
.mark i{border-radius:1.5px;background:var(--blue);aspect-ratio:1}
.mark i.d{opacity:.22}
.site-nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--border)}
.nav-in{display:flex;align-items:center;gap:20px;height:60px}
.brand{display:flex;align-items:center;gap:10px}
.wordmark{font-weight:600;letter-spacing:-.02em;color:var(--heading);font-size:16px}
.nav-links{display:flex;gap:26px;margin-left:auto}
.nav-links a{font-size:14px;color:var(--muted);transition:color .15s;white-space:nowrap}
.nav-links a:hover{color:var(--blue)}
.nav-links a.on{color:var(--heading)}
.nav-links a.on:hover{color:var(--blue)}
.nav-toggle{display:none;margin-left:12px;width:40px;height:40px;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:10px;background:var(--white);color:var(--heading);cursor:pointer;flex:none;padding:0}
.nav-toggle svg{width:22px;height:22px}
.nav-toggle .ico-close{display:none}
.nav-links .nav-cta{display:none}
.btn{display:inline-flex;align-items:center;gap:7px;font-size:14px;font-weight:500;padding:8px 14px;border-radius:var(--radius);transition:transform .15s,box-shadow .15s,background .15s,border-color .15s;white-space:nowrap}
.btn-primary{background:var(--heading);color:#fff}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 20px -8px rgba(9,9,11,.45)}
.btn-ghost{color:var(--heading);border:1px solid var(--border-mid);background:var(--white)}
.btn-ghost:hover{border-color:var(--heading)}
@media(max-width:900px){
  .nav-toggle{display:inline-flex;margin-left:auto}
  .nav-waitlist{display:none}
  .nav-links{position:absolute;top:100%;left:0;right:0;display:none;flex-direction:column;gap:0;margin-left:0;padding:6px 0 12px;background:rgba(255,255,255,.98);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--border);box-shadow:0 10px 26px rgba(9,9,11,.07)}
  .site-nav.nav-open .nav-links{display:flex}
  .site-nav.nav-open .nav-toggle .ico-open{display:none}
  .site-nav.nav-open .nav-toggle .ico-close{display:inline}
  .nav-links a{padding:13px var(--gutter);font-size:15px;color:var(--body)}
  .nav-links .nav-cta{display:inline-flex;justify-content:center;margin:10px var(--gutter) 2px;padding:12px;color:#fff}
}

/* ---- index: page head ---- */
.blog-top{padding-top:clamp(44px,7vw,84px);padding-bottom:8px}
.blog-top h1{font-size:clamp(30px,4.6vw,46px);margin-top:14px}
.blog-top p{margin-top:14px;color:var(--muted);font-size:clamp(15px,1.7vw,18px);max-width:60ch}

/* ---- featured ---- */
.feat-wrap{padding-left:0;padding-right:0}
.feat{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-top:40px;
  background:linear-gradient(160deg,var(--blue-bg),var(--white) 72%);border:1px solid var(--blue-bdr);
  border-radius:var(--radius-lg);padding:36px;box-shadow:var(--shadow)}
.feat-media{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);background:var(--light)}
.feat-media img{width:100%;aspect-ratio:16/9;object-fit:cover}
.feat-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);margin:6px 0 12px}
.feat-meta .d{color:var(--body);font-weight:500}
.feat-meta .sep{color:var(--border-mid)}
.feat h2{font-size:clamp(24px,3vw,34px)}
.feat p{margin:14px 0 18px;color:var(--muted);font-size:15px}
.more{font-size:14px;font-weight:600;color:var(--blue-mid)}
.more:hover{color:var(--blue-dark)}
@media(max-width:820px){.feat-wrap{padding-left:var(--gutter);padding-right:var(--gutter)}.feat{grid-template-columns:1fr;padding:24px;gap:24px}.feat-media{order:-1}}

/* ---- recent (topics + grid) ---- */
.recent{padding-top:clamp(48px,7vw,90px);padding-bottom:clamp(48px,7vw,90px)}
.recent-head{font-size:clamp(22px,3vw,30px);margin-bottom:28px}
.recent-grid{display:grid;grid-template-columns:230px 1fr;gap:36px;align-items:start}
.topics{position:sticky;top:76px;align-self:start}
.topics h3{font-size:19px;margin-bottom:8px}
.topic-list{list-style:none;display:flex;flex-direction:column}
.topic-list button{font-family:inherit;text-align:left;font-size:14.5px;color:var(--muted);padding:11px 0;border:none;border-bottom:1px solid var(--border);background:none;cursor:pointer;transition:color .15s;width:100%}
.topic-list button:hover{color:var(--heading)}
.topic-list button[aria-pressed="true"]{color:var(--blue-dark);font-weight:600}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.pcard{display:flex;flex-direction:column;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s,border-color .15s;color:inherit}
.pcard:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--border-mid)}
.pcard-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--light);border-bottom:1px solid var(--border)}
.pcard-thumb img{width:100%;height:100%;object-fit:cover}
.pcard-body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.pcard-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--muted)}
.pcard-meta .d{color:var(--body);font-weight:500}
.pcard-meta .sep{color:var(--border-mid)}
.pcard h3{font-size:16.5px;line-height:1.3;margin:9px 0 8px}
.pcard p{font-size:13.5px;line-height:1.5;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.pcard .more{margin-top:auto;padding-top:14px}
@media(max-width:820px){.recent-grid{grid-template-columns:1fr}.topics{order:2}.topic-list{display:flex;flex-direction:row;flex-wrap:wrap;gap:8px}.topic-list button{border:1px solid var(--border);border-radius:999px;padding:7px 14px;width:auto}}
@media(max-width:560px){.cards{grid-template-columns:1fr}}

/* ---- article ---- */
.post-hero{background:linear-gradient(180deg,var(--blue-bg),var(--white));border-bottom:1px solid var(--border)}
.post-hero-in{max-width:960px;margin:0 auto;padding:clamp(28px,5vw,52px) var(--gutter) clamp(26px,4vw,42px)}
.post-back{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);margin-bottom:22px}
.post-back:hover{color:var(--heading)}
.post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:14px}
.post-meta .d{color:var(--body);font-weight:500}
.post-meta .sep{color:var(--border-mid)}
.post-hero h1{font-size:clamp(28px,4.4vw,44px);letter-spacing:-.025em}
.post-figure{max-width:960px;margin:32px auto 0;padding:0 var(--gutter)}
.post-figure img{width:100%;height:auto;display:block;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--light)}
.post{max-width:960px;margin:0 auto;padding:clamp(36px,6vw,64px) var(--gutter) 0}
/* inline body figures (slides): break out wider than the text column, centered */
.post-fig{width:min(960px,94vw);margin:32px 0;margin-left:50%;transform:translateX(-50%)}
.post-fig img{width:100%;height:auto;display:block;border-radius:var(--radius-lg)}
.post-fig figcaption{margin-top:10px;text-align:center;font-size:12.5px;color:var(--muted)}
.post-author{display:flex;gap:14px;align-items:flex-start;padding:18px 20px;background:var(--off);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:34px}
.post-author .av{flex:none;width:80px;height:80px;border-radius:50%;object-fit:cover;background:var(--blue-bg);border:1px solid var(--border)}
.post-author .nm{font-weight:600;color:var(--heading);font-size:14.5px}
.post-author .rl{font-size:12.5px;color:var(--blue-dark);margin-bottom:6px}
.post-author .bio{font-size:12.5px;line-height:1.55;color:var(--muted)}
.post-lead{font-size:clamp(17px,2vw,20px);line-height:1.5;color:var(--heading);font-weight:500;margin-bottom:26px}
.post-toc{margin:2px 0 32px;padding:22px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.post-toc .label{margin-bottom:12px;display:block}
.post-toc ul{list-style:disc;padding-left:22px}
.post-toc li{font-size:15px;color:var(--body);margin-bottom:7px}
.post-toc li:last-child{margin-bottom:0}
.post-toc li::marker{color:var(--muted)}
.post-abt{font-size:19px;font-weight:600;color:var(--heading);margin-bottom:16px}
.post-authorbox{max-width:960px;margin:0 auto;padding:clamp(28px,4vw,44px) var(--gutter) 0}
.post-body{font-size:16.5px;line-height:1.72;color:var(--body)}
.post-body h2{font-size:clamp(21px,2.6vw,27px);margin:44px 0 14px;letter-spacing:-.02em}
.post-body h3{font-size:18.5px;margin:32px 0 10px}
.post-body h4{font-size:14px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--blue-dark);margin:26px 0 10px;font-weight:500}
.post-body p{margin:0 0 18px}
.post-body ul,.post-body ol{margin:0 0 22px;padding-left:26px}
.post-body ul{list-style:disc}
.post-body ol{list-style:decimal}
.post-body li{line-height:1.65;margin-bottom:9px;padding-left:6px}
.post-body li:last-child{margin-bottom:0}
.post-body li::marker{color:var(--muted)}
.post-body ol>li::marker{color:var(--body);font-weight:600}
.post-body strong{color:var(--heading);font-weight:600}
.post-body a{color:var(--blue-mid);text-decoration:underline;text-underline-offset:2px}
.post-body blockquote{margin:26px 0;padding:18px 24px;background:var(--off);border:1px solid var(--border);border-radius:var(--radius-lg);font-size:18px;line-height:1.5;color:var(--heading);font-weight:500}
.post-body code{font-family:var(--mono);font-size:.9em;background:var(--light);border:1px solid var(--border);border-radius:5px;padding:1px 6px;color:var(--blue-dark)}
.post-body hr{border:none;border-top:1px solid var(--border);margin:38px 0}
.post-sources{margin-top:14px}
.post-sources li{font-size:14px;color:var(--muted)}
.post-end{max-width:960px;margin:48px auto 0;padding:0 var(--gutter)}
.post-cta{padding:34px;background:var(--navy);border-radius:var(--radius-lg);text-align:center;color:#e7edf5}
.post-cta h3{color:#fff;font-size:22px;margin-bottom:8px}
.post-cta p{color:#9fb2c9;font-size:14.5px;max-width:46ch;margin:0 auto 18px}
.post-cta .btn-blue{background:var(--blue);color:#fff}
.post-cta .btn-blue:hover{background:var(--blue-mid)}
.post-more{max-width:960px;margin:0 auto;padding:clamp(40px,6vw,64px) var(--gutter)}
.post-more h4{font-size:13px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:16px}
.post-more-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.post-more-grid a{display:flex;flex-direction:column;gap:6px;padding:18px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--white);transition:border-color .15s,transform .15s}
.post-more-grid a:hover{border-color:var(--border-mid);transform:translateY(-2px)}
.post-more-grid .mt{font-size:11.5px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.post-more-grid .mh{font-size:15px;font-weight:600;color:var(--heading);line-height:1.3}
@media(max-width:560px){.post-more-grid{grid-template-columns:1fr}}

/* ---- FAQ ---- */
.post-faq{max-width:960px;margin:0 auto;padding:clamp(24px,4vw,44px) var(--gutter) 0}
.post-faq h2{font-size:clamp(22px,3vw,30px);margin-bottom:18px;letter-spacing:-.02em}
.faq-list{border-top:1px solid var(--border)}
.faq-item{border-bottom:1px solid var(--border)}
.faq-item summary{list-style:none;cursor:pointer;padding:18px 42px 18px 0;position:relative;font-size:17px;font-weight:600;color:var(--heading);line-height:1.4}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"";position:absolute;right:8px;top:23px;width:9px;height:9px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(-135deg)}
.faq-item summary:hover{color:var(--blue-dark)}
.faq-a{padding:0 42px 22px 0;font-size:16px;line-height:1.7;color:var(--body)}
.faq-a p{margin:0 0 12px}
.faq-a p:last-child{margin-bottom:0}
.faq-a ul,.faq-a ol{margin:0 0 12px;padding-left:24px}
.faq-a li{margin-bottom:6px}
.faq-a li:last-child{margin-bottom:0}
.faq-a li::marker{color:var(--muted)}
.faq-a strong{color:var(--heading);font-weight:600}
.faq-a a{color:var(--blue-mid);text-decoration:underline;text-underline-offset:2px}
/* ---- footer ---- */
.foot{border-top:1px solid var(--border);background:var(--white);margin-top:20px}
.foot-in{padding-top:36px;padding-bottom:22px;display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.foot .brand{margin-right:auto}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{font-size:13.5px;color:var(--muted)}
.foot-links a:hover{color:var(--heading)}
.foot-legal{padding-top:18px;padding-bottom:34px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.foot-copy{font-family:var(--mono);font-size:12px;color:var(--dim);letter-spacing:.02em}
.foot-legal-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-legal-links a{font-size:12.5px;color:var(--dim)}
.foot-legal-links a:hover{color:var(--body)}
@media(max-width:720px){
  .foot-in{flex-direction:column;align-items:flex-start;gap:20px}
  .foot .brand{margin-right:0}
  .foot-links{flex-wrap:wrap;gap:14px 22px}
  .foot-legal{flex-direction:column;align-items:flex-start;gap:12px}
}