:root{
  --bg:#070D1E;--bg2:#04060F;--panel:rgba(255,255,255,.03);
  --border:rgba(255,255,255,.1);--borderS:rgba(255,255,255,.2);
  --ink:#EAF1FB;--muted:rgba(234,241,251,.68);--subtle:rgba(234,241,251,.44);
  --acc:#4E7BF2;--accHi:#9FBBFF;--steel:#8AA6C9;
  --sans:-apple-system,"Segoe UI",system-ui,Roboto,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,monospace;
}
*{margin:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg2);color:var(--ink);font-family:var(--sans);line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.bg{position:fixed;inset:0;z-index:-1;background:radial-gradient(120% 80% at 50% -6%,#0C1731,#070D1E 46%,#04060F)}
a{color:var(--accHi);text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%}

/* header / footer */
header.site,.foot{max-width:1080px;margin:0 auto;padding:22px clamp(18px,4vw,32px)}
header.site{display:flex;align-items:center;justify-content:space-between;gap:16px}
header.site .home{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:800;letter-spacing:-.01em;font-size:17px}
header.site .home .dot{width:20px;height:20px;border-radius:6px;background:linear-gradient(160deg,#9FBBFF,#3A5FD9);box-shadow:0 4px 14px -4px rgba(78,123,242,.6)}
header.site nav{display:flex;gap:20px;align-items:center;font-size:14px}
header.site nav a{color:var(--muted)}header.site nav a.cta{color:#fff;background:linear-gradient(180deg,#5A84F5,#3556CB);padding:8px 15px;border-radius:99px;font-weight:700;font-size:13px}
header.site nav a.cta:hover{text-decoration:none;filter:brightness(1.06)}
@media(max-width:640px){header.site nav a.plain{display:none}}

.foot{border-top:1px solid var(--border);margin-top:60px;color:var(--subtle);font-size:13px;display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:space-between;align-items:center}
.foot a{color:var(--muted)}
.foot .links{display:flex;gap:18px;flex-wrap:wrap}

/* index / listing */
.wrap{max-width:1080px;margin:0 auto;padding:clamp(30px,6vw,64px) clamp(18px,4vw,32px)}
.hero-h{max-width:720px}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--steel);margin-bottom:14px;display:inline-block}
h1.big{font-size:clamp(32px,6vw,54px);font-weight:800;letter-spacing:-.03em;line-height:1.05}
.lede{color:var(--muted);font-size:clamp(16px,2vw,19px);margin-top:18px;max-width:60ch}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:44px}
.card{display:block;border:1px solid var(--border);border-radius:18px;background:var(--panel);padding:24px;transition:border-color .18s,transform .18s,background .18s}
.card:hover{border-color:var(--borderS);transform:translateY(-3px);background:rgba(255,255,255,.05);text-decoration:none}
.card .tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--acc)}
.card h2{font-size:20px;font-weight:750;letter-spacing:-.02em;margin:12px 0 10px;color:var(--ink);line-height:1.25}
.card p{color:var(--muted);font-size:14.5px}
.card .rt{margin-top:16px;font-family:var(--mono);font-size:11px;color:var(--subtle);letter-spacing:.04em}

/* article */
article{max-width:760px;margin:0 auto;padding:clamp(24px,5vw,44px) clamp(18px,4vw,28px) 40px}
.crumb{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--subtle);margin-bottom:22px}
.crumb a{color:var(--steel)}
article h1{font-size:clamp(29px,5.2vw,46px);font-weight:800;letter-spacing:-.03em;line-height:1.08}
.meta{color:var(--subtle);font-family:var(--mono);font-size:12px;letter-spacing:.05em;margin:16px 0 8px;display:flex;gap:14px;flex-wrap:wrap}
article .lede{font-size:clamp(17px,2.1vw,20px);color:var(--muted);margin:20px 0 8px;line-height:1.6}
article h2{font-size:clamp(22px,3.4vw,30px);font-weight:750;letter-spacing:-.02em;margin:44px 0 14px;line-height:1.2}
article h3{font-size:clamp(18px,2.4vw,22px);font-weight:700;letter-spacing:-.01em;margin:30px 0 10px}
article p{color:#D4DEEE;font-size:17px;margin:16px 0}
article ul,article ol{color:#D4DEEE;font-size:17px;margin:16px 0 16px 4px;padding-left:22px}
article li{margin:9px 0}
article strong{color:#fff;font-weight:650}
article a{color:var(--accHi);text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(159,187,255,.4)}
article a:hover{text-decoration-color:var(--accHi)}
blockquote{margin:26px 0;padding:16px 22px;border-left:3px solid var(--acc);background:rgba(78,123,242,.07);border-radius:0 12px 12px 0;color:#E4ECF9;font-size:17.5px}
.callout{margin:30px 0;border:1px solid rgba(78,123,242,.3);background:radial-gradient(120% 100% at 0% 0%,rgba(78,123,242,.12),transparent 60%),var(--panel);border-radius:18px;padding:24px}
.callout h4{font-size:17px;font-weight:750;margin-bottom:8px;color:#fff}
.callout p{margin:6px 0;font-size:15.5px;color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:8px;margin-top:12px;background:linear-gradient(180deg,#5A84F5,#3556CB);color:#fff;padding:11px 18px;border-radius:99px;font-weight:700;font-size:14.5px;border:1px solid rgba(178,204,255,.5);box-shadow:0 10px 24px -10px rgba(78,123,242,.7)}
.btn:hover{text-decoration:none;filter:brightness(1.06)}
.faq{margin-top:16px}
.faq details{border-top:1px solid var(--border);padding:14px 0}
.faq summary{cursor:pointer;font-weight:650;font-size:17px;color:#fff;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--acc);font-weight:800}
.faq details[open] summary::before{content:"– "}
.faq p{margin-top:10px}
.related{margin-top:52px;border-top:1px solid var(--border);padding-top:26px}
.related h3{margin-top:0}
.related a{display:block;color:var(--ink);padding:10px 0;border-bottom:1px solid var(--border);font-weight:600;text-decoration:none}
.related a:hover{color:var(--accHi)}
.tocwrap{border:1px solid var(--border);border-radius:14px;background:var(--panel);padding:16px 20px;margin:24px 0}
.tocwrap b{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel)}
.tocwrap ol{margin:10px 0 2px;font-size:15px}
.tocwrap a{color:var(--muted);text-decoration:none}.tocwrap a:hover{color:var(--accHi)}
article table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px;border:1px solid var(--border);border-radius:12px;overflow:hidden}
article th,article td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top}
article th{background:rgba(78,123,242,.1);color:#fff;font-weight:700;font-size:13px;letter-spacing:.01em}
article td{color:#D4DEEE}
article tr:last-child td{border-bottom:none}
article thead th:first-child{white-space:nowrap}