:root{--ink:#F2F6FC;--paper:#05070C;--paper2:#080C14;--surface:#0B1018;--surface2:#101827;--deep:#2C66F8;--soft:#7FA6FF;--line:#192233;--line2:#243049;--muted:#8795AB;--body:#B8C2D2;--green:#2BD99A}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,system-ui,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}
body:before{content:"";position:fixed;inset:0;z-index:-1;background:radial-gradient(60% 40% at 50% -5%,rgba(47,107,255,.22),transparent 70%),radial-gradient(40% 30% at 90% 20%,rgba(61,214,245,.06),transparent 70%)}
a{color:var(--soft);text-decoration:none}a:hover{text-decoration:underline}
.w{max-width:1120px;margin:0 auto;padding:0 24px}
/* top bar */
.top{position:sticky;top:0;z-index:20;background:rgba(5,7,12,.78);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.top .w{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-family:'Plus Jakarta Sans',sans-serif;font-weight:800;font-size:19px;letter-spacing:-.02em}.brand:hover{text-decoration:none}
.brand img{width:30px;height:30px;border-radius:9px}.brand b{color:#5B8CFF}
.nav{display:flex;align-items:center;gap:6px}.nav a{color:var(--muted);font-size:14px;font-weight:600;padding:8px 12px;border-radius:10px}.nav a:hover{color:var(--ink);background:var(--surface);text-decoration:none}.nav a.on{color:var(--ink);background:var(--surface2)}
.nav .cta{background:var(--deep);color:#fff;margin-left:6px;box-shadow:0 8px 24px rgba(47,107,255,.35)}.nav .cta:hover{background:#4a7fff;color:#fff}
/* hero */
.hero{padding:72px 0 40px;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--soft)}
.eyebrow:before{content:"";width:26px;height:1px;background:var(--soft);opacity:.7}
h1{font-family:'Plus Jakarta Sans',sans-serif;font-weight:800;font-size:clamp(36px,6vw,58px);letter-spacing:-.045em;line-height:1.05;margin:16px 0 16px}
.lead{max-width:680px;margin:0 auto;color:var(--body);font-size:17px;line-height:1.7}
.meta{display:inline-flex;align-items:center;gap:8px;margin-top:22px;padding:7px 14px;border-radius:999px;background:var(--surface);border:1px solid var(--line2);color:var(--muted);font-size:13px}.meta i{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 10px var(--green)}
/* glance */
.glance{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:8px 0 56px}
.g{background:linear-gradient(165deg,rgba(47,107,255,.10),var(--surface) 65%);border:1px solid var(--line2);border-radius:18px;padding:18px 18px 16px}
.g svg{width:22px;height:22px;stroke:var(--soft);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;margin-bottom:10px}
.g b{display:block;font-family:'Plus Jakarta Sans',sans-serif;font-size:15.5px;letter-spacing:-.01em;margin-bottom:3px}.g span{color:var(--muted);font-size:13.5px;line-height:1.5;display:block}
/* layout */
.layout>*{min-width:0}.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:48px;align-items:start;padding-bottom:40px}
.toc{position:sticky;top:92px}
.toc h4{margin:0 0 12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);font-weight:500}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line2)}
.toc a{display:flex;gap:10px;color:var(--muted);font-size:14px;font-weight:500;padding:7px 0 7px 16px;margin-left:-1px;border-left:2px solid transparent;line-height:1.4}
.toc a span{font-family:ui-monospace,monospace;font-size:11.5px;opacity:.7;padding-top:2px}
.toc a:hover{color:var(--ink);text-decoration:none}.toc a.on{color:var(--ink);border-left-color:var(--deep);font-weight:600}
.toc .help{margin-top:24px;padding:16px;border-radius:16px;background:var(--surface);border:1px solid var(--line2);font-size:13.5px;color:var(--muted);line-height:1.55}.toc .help b{display:block;color:var(--ink);font-family:'Plus Jakarta Sans',sans-serif;margin-bottom:4px;font-size:14.5px}
/* sections */
.doc section{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:30px 34px;margin-bottom:16px}
.doc h2{display:flex;align-items:center;gap:14px;font-family:'Plus Jakarta Sans',sans-serif;font-size:22px;letter-spacing:-.025em;margin:0 0 14px}
.doc h2 .n{flex:none;width:34px;height:34px;border-radius:11px;display:grid;place-items:center;background:rgba(47,107,255,.14);border:1px solid rgba(47,107,255,.4);color:var(--soft);font-family:ui-monospace,monospace;font-size:13px;font-weight:600;letter-spacing:0}
.doc p,.doc li{color:var(--body);font-size:15.5px;margin:0 0 12px}.doc p:last-child{margin-bottom:0}
.doc ul{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.doc li{position:relative;padding:12px 16px 12px 44px;background:var(--paper2);border:1px solid var(--line);border-radius:14px;margin:0}
.doc li:before{content:"";position:absolute;left:16px;top:17px;width:16px;height:16px;border-radius:6px;background:rgba(47,107,255,.16) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%237FA6FF' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center/11px no-repeat;border:1px solid rgba(47,107,255,.4)}
.doc li b{color:var(--ink)}
.notice{margin-top:14px;padding:14px 16px;border-radius:14px;background:rgba(245,181,68,.07);border:1px solid rgba(245,181,68,.28);color:#F5CE85!important;font-size:14.5px!important}
/* contact + footer */
.contact{margin:8px 0 72px;border-radius:26px;padding:34px;text-align:center;background:radial-gradient(70% 140% at 50% 0%,rgba(47,107,255,.32),var(--surface));border:1px solid var(--line2)}
.contact h3{font-family:'Plus Jakarta Sans',sans-serif;font-size:24px;letter-spacing:-.03em;margin:0 0 6px}.contact p{color:var(--body);margin:0 0 18px;font-size:15.5px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--deep);color:#fff!important;font-weight:700;font-size:14.5px;padding:12px 22px;border-radius:12px;box-shadow:0 10px 30px rgba(47,107,255,.4)}.btn:hover{background:#4a7fff;text-decoration:none}
.btn.ghost{background:var(--surface2);border:1px solid var(--line2);box-shadow:none;margin-left:8px}
footer{border-top:1px solid var(--line);background:var(--paper2)}footer .w{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:26px 24px;color:var(--muted);font-size:13.5px}footer nav{display:flex;gap:18px}footer a{color:var(--muted)}footer a:hover{color:var(--ink)}
/* simple centred pages */
.center-page{min-height:calc(100vh - 64px - 78px);display:grid;place-items:center;padding:48px 0}
.card{max-width:480px;margin:0 auto;text-align:center;padding:44px 34px;border-radius:28px;background:linear-gradient(165deg,rgba(47,107,255,.12),var(--surface) 60%);border:1px solid var(--line2);box-shadow:0 40px 100px rgba(0,0,0,.5)}
.code{font-family:'Plus Jakarta Sans',sans-serif;font-weight:800;font-size:88px;letter-spacing:-.06em;line-height:1;background:linear-gradient(135deg,#5B8CFF,#3DD6F5);-webkit-background-clip:text;background-clip:text;color:transparent}
.tick{width:64px;height:64px;margin:0 auto 18px;border-radius:20px;display:grid;place-items:center;background:rgba(43,217,154,.12);border:1px solid rgba(43,217,154,.4)}.tick svg{width:30px;height:30px;stroke:var(--green);fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.card h1{font-size:30px;margin:14px 0 10px}.card p{color:var(--body);margin:0 0 22px}
/* responsive */
@media(max-width:900px){.layout{grid-template-columns:1fr;gap:20px}.toc{position:sticky;top:64px;z-index:10;margin:0 -24px;padding:10px 24px;background:rgba(5,7,12,.9);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.toc h4,.toc .help{display:none}.toc ol{display:flex;gap:6px;overflow-x:auto;border:none;scrollbar-width:none}.toc ol::-webkit-scrollbar{display:none}.toc a{white-space:nowrap;border:1px solid var(--line2);border-radius:999px;padding:7px 13px;margin:0;background:var(--surface);font-size:13px}.toc a span{display:none}.toc a.on{border-color:var(--deep);background:rgba(47,107,255,.16)}.glance{grid-template-columns:repeat(2,minmax(0,1fr))}.doc section{padding:24px 20px}html{scroll-padding-top:130px}}
@media(max-width:560px){.hero{padding:44px 0 28px}.nav a:not(.cta){display:none}.doc h2{font-size:19px}.contact{padding:26px 20px}.btn.ghost{margin:10px 0 0}.g{padding:15px}.card{padding:34px 22px}}
@media print{body:before,.top,.toc,.contact,footer{display:none}body{background:#fff;color:#000}.doc section{background:none;border:none;padding:0}.doc p,.doc li,.lead{color:#222}.doc li{background:none;border:none;padding-left:18px}.doc li:before{display:none}.doc ul{list-style:disc}h1,.doc h2{color:#000}}