:root{color-scheme:only light;background:#FBFAF7;
  --ink:#0B1F2A;--paper:#FBFAF7;--teal:#0FB4A3;--teal-deep:#087066;
  --depth:#123B54;--depth-2:#0F2E42;--signal:#FF6A3D;--line:#D9E2E4;
  --line-dark:rgba(255,255,255,.14);--muted:#5A6B72;--muted-dark:#B9C9CF;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'IBM Plex Sans',system-ui,sans-serif;background:var(--paper);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4{font-family:'Space Grotesk',sans-serif;line-height:1.12;letter-spacing:-.02em}
.mono{font-family:'IBM Plex Mono',monospace}
a{color:inherit;text-decoration:none}
.wrap{max-width:1140px;margin:0 auto;padding:0 28px}

/* nav */
header{position:sticky;top:0;z-index:50;background:var(--paper);border-bottom:1px solid var(--line)}@supports ((backdrop-filter:blur(10px)) or (-webkit-backdrop-filter:blur(10px))){header{background:rgba(251,250,247,.85);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-family:'Space Grotesk';font-weight:700;font-size:19px}
.brand small{font-family:'IBM Plex Mono';font-weight:400;font-size:7px;letter-spacing:.08em;color:var(--muted);text-transform:uppercase;opacity:.5}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{font-size:14.5px;color:var(--muted);transition:color .18s}
.nav-links a:hover{color:var(--ink)}
.nav-links a.btn{color:#fff}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:'Space Grotesk';font-weight:600;font-size:15px;padding:12px 22px;border-radius:8px;background:var(--ink);color:#fff;border:1px solid var(--ink);transition:transform .16s ease, box-shadow .16s ease}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(11,31,42,.22)}
.btn.signal{background:var(--signal);border-color:var(--signal);color:var(--ink)}
.btn.signal:hover{box-shadow:0 10px 24px rgba(255,106,61,.34)}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:rgba(11,31,42,.05);box-shadow:none;transform:translateY(-2px)}
.nav .btn{padding:10px 18px;font-size:14px}
.menu-toggle{display:none;background:none;border:0;cursor:pointer}

/* breadcrumb */
.crumb{padding:22px 0 0;font-family:'IBM Plex Mono';font-size:12.5px;color:var(--muted);letter-spacing:.02em}
.crumb a:hover{color:var(--teal-deep)}
.crumb span{color:var(--teal-deep)}

/* article */
.article{padding:26px 0 20px}
.reading{max-width:748px;margin:0 auto}
.eyebrow{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--teal-deep);display:inline-flex;align-items:center;gap:9px;margin-bottom:16px}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:2px;background:var(--teal);box-shadow:0 0 0 4px rgba(15,180,163,.18)}
.article h1{font-size:clamp(30px,4.4vw,46px);font-weight:700;margin-bottom:16px}
.meta{font-family:'IBM Plex Mono';font-size:12.5px;color:var(--muted);margin-bottom:26px;display:flex;gap:16px;flex-wrap:wrap}
.lede{font-size:19px;color:var(--ink);margin-bottom:30px;line-height:1.6}
.reading h2{font-size:26px;font-weight:700;margin:38px 0 14px}
.reading h3{font-size:19px;font-weight:600;margin:26px 0 10px}
.reading p{font-size:16.5px;color:#2c3b42;margin-bottom:16px}
.reading ul,.reading ol{margin:0 0 18px 4px;padding-left:22px}
.reading li{font-size:16.5px;color:#2c3b42;margin-bottom:9px}
.reading strong{color:var(--ink);font-weight:600}
.reading a.ilink{color:var(--teal-deep);border-bottom:1px solid rgba(15,180,163,.35)}
.reading a.ilink:hover{border-bottom-color:var(--teal-deep)}
.callout{background:#fff;border:1px solid var(--line);border-left:3px solid var(--teal);border-radius:10px;padding:18px 20px;margin:22px 0}
.callout .k{font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--teal-deep);margin-bottom:6px}
.callout p{margin:0;font-size:15.5px}
.tocbox{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:0 0 30px}
.tocbox .k{font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.tocbox ol{margin:0;padding-left:20px}
.tocbox li{font-size:15px;margin-bottom:8px}
.tocbox a:hover{color:var(--teal-deep)}

/* faq */
.afaq{max-width:748px;margin:44px auto 0;border-top:1px solid var(--line);padding-top:10px}
.afaq h2{font-size:22px;font-weight:700;margin:18px 0 10px}
.afaq .qa{border-top:1px solid var(--line);padding:20px 0}
.afaq .qa:first-of-type{border-top:0}
.afaq .qa h3{font-size:16.5px;font-weight:600;margin-bottom:7px;font-family:'Space Grotesk'}
.afaq .qa p{font-size:15px;color:var(--muted)}

/* related */
.related{background:#fff;border-top:1px solid var(--line)}
.related .reading{max-width:1000px}
.related h2{font-size:20px;font-weight:700;margin-bottom:20px}
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rel{border:1px solid var(--line);border-radius:12px;padding:20px;background:var(--paper);transition:border-color .16s, box-shadow .16s;display:flex;flex-direction:column;gap:8px}
.rel:hover{border-color:var(--teal);box-shadow:0 12px 30px -22px rgba(11,31,42,.4)}
.rel .rk{font-family:'IBM Plex Mono';font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--teal-deep)}
.rel h3{font-size:16px;font-weight:600;font-family:'Space Grotesk';line-height:1.3}
.rel .go{font-size:13.5px;color:var(--muted);display:inline-flex;align-items:center;gap:6px;margin-top:auto}
.rel:hover .go{color:var(--teal-deep)}

/* cta band */
.ctaband{background:var(--ink);color:#fff;position:relative;overflow:hidden}
.grid-bg{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:40px 40px;mask-image:radial-gradient(ellipse 80% 100% at 50% 50%,#000 35%,transparent 100%);pointer-events:none}
.ctaband .wrap{position:relative;z-index:2;text-align:center}
.ctaband h2{font-size:clamp(24px,3vw,34px);font-weight:700;margin-bottom:12px}
.ctaband p{color:var(--muted-dark);max-width:52ch;margin:0 auto 24px;font-size:16px}

/* index/listing */
.listing{padding:60px 0 40px}
.listing .head{max-width:720px;margin-bottom:40px}
.listing .head .eyebrow{margin-bottom:14px}
.listing .head h1{font-size:clamp(30px,4vw,44px);font-weight:700;margin-bottom:14px}
.listing .head p{font-size:17px;color:var(--muted)}
.pcluster{margin-bottom:44px}
.pcluster .ph{display:flex;align-items:baseline;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:18px}
.pcluster .ph h2{font-size:22px;font-weight:700}
.pcluster .ph a{font-family:'IBM Plex Mono';font-size:12.5px;color:var(--teal-deep)}
.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.gcard{border:1px solid var(--line);border-radius:12px;padding:22px;background:#fff;transition:transform .16s ease, box-shadow .16s ease, border-color .16s;display:flex;flex-direction:column;gap:8px}
.gcard:hover{transform:translateY(-3px);box-shadow:0 16px 36px -24px rgba(11,31,42,.4);border-color:var(--teal)}
.gcard .rk{font-family:'IBM Plex Mono';font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--teal-deep)}
.gcard h3{font-size:18px;font-weight:600;font-family:'Space Grotesk';line-height:1.3}
.gcard p{font-size:14px;color:var(--muted);flex:1}
.gcard .go{font-size:13.5px;font-weight:600;font-family:'Space Grotesk';color:var(--ink);display:inline-flex;gap:6px;align-items:center}
.gcard:hover .go{color:var(--teal-deep)}

/* footer */
footer{background:var(--depth-2);color:var(--muted-dark);padding:40px 0}
.foot{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.foot .brand{color:#fff}
.foot .brand small{color:var(--muted-dark)}
.foot-links{display:flex;gap:22px;font-size:14px;flex-wrap:wrap}
.foot-links a:hover{color:#fff}
.foot .fine{width:100%;border-top:1px solid var(--line-dark);padding-top:20px;margin-top:6px;font-size:12.5px;font-family:'IBM Plex Mono'}

@media(max-width:820px){
  .rel-grid{grid-template-columns:1fr}
  .card-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  .nav-links{display:none}
  .menu-toggle{display:block}
  .nav-links.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:var(--paper);border-bottom:1px solid var(--line);padding:18px 28px;gap:16px;align-items:flex-start}
  .lede{font-size:17px}
  .reading p,.reading li{font-size:16px}
}