:root{
  --s0:#0d0d0f; --s1:#121214; --s2:#18181b; --s3:#1f1f23; --s4:#27272b;
  --ink:#e4e4e7; --ink2:#a1a1aa; --muted:#8e8e98;
  --stroke:#2a2a30; --stroke2:#3f3f46;
  --gold:#ffd700; --gold-h:#ffdf33; --gold-a:#e6c200; --gold-soft:#ffd7001f; --on-gold:#1c1206; --acc-text:#ffd700;
  --radius:8px; --radius-lg:12px; --radius-sm:4px;
  --font-sans:"Segoe UI Variable Text","Segoe UI",Inter,system-ui,-apple-system,sans-serif;
  --font-mono:"Cascadia Code","JetBrains Mono",Consolas,ui-monospace,monospace;
  --maxw:1140px;
}
:root[data-theme="light"]{
  --s0:#ececef; --s1:#f4f4f5; --s2:#ffffff; --s3:#ffffff; --s4:#e4e4e7;
  --ink:#18181b; --ink2:#52525b; --muted:#70707a;
  --stroke:#e4e4e7; --stroke2:#d4d4d8;
  --gold-soft:#ffd70026; --acc-text:#8a6d00;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--s0);color:var(--ink);font-family:var(--font-sans);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
code,kbd,pre{font-family:var(--font-mono)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{display:inline-block;color:var(--acc-text);font-weight:600;font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 14px}
h2{font-size:clamp(27px,4vw,40px);letter-spacing:-.025em;font-weight:700;margin:0 0 14px;line-height:1.12}
.lede{color:var(--ink2);font-size:clamp(16px,2vw,18.5px);max-width:640px;margin:0}

header.nav{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--s0) 78%,transparent);backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--stroke)}
.nav-in{display:flex;align-items:center;gap:14px;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:15px;letter-spacing:-.01em}
.brand svg,.brand img{width:28px;height:28px}
.nav-links{margin-left:auto;display:flex;gap:20px;align-items:center}
.nav-links a.link{color:var(--ink2);font-weight:500;font-size:14px}
.nav-links a.link:hover{color:var(--ink)}
.icon-btn,.lang{display:inline-grid;place-items:center;height:34px;border-radius:var(--radius-sm);border:1px solid var(--stroke);background:var(--s1);color:var(--ink2);cursor:pointer}
.icon-btn{width:34px}
.lang{grid-auto-flow:column;gap:6px;padding:0 11px;font-size:13px;font-weight:600;text-decoration:none}
.icon-btn:hover,.lang:hover{color:var(--ink);border-color:var(--stroke2)}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14.5px;padding:10px 16px;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:background .15s cubic-bezier(.4,0,.2,1),transform .15s cubic-bezier(.4,0,.2,1),border-color .15s}
.btn-gold{background:var(--gold);color:var(--on-gold)}
.btn-gold:hover{background:var(--gold-h);transform:translateY(-1px)}
.btn-ghost{background:var(--s1);border-color:var(--stroke);color:var(--ink)}
.btn-ghost:hover{border-color:var(--stroke2)}
.btn-lg{padding:13px 22px;font-size:15.5px}
@media (max-width:820px){.nav-links a.link{display:none}}

.hero{position:relative;overflow:hidden;text-align:center;padding:96px 0 72px}
.hero::before{content:"";position:absolute;top:-160px;left:50%;transform:translateX(-50%);width:1100px;height:620px;background:radial-gradient(60% 60% at 50% 0,#ffd7002e,#ffd7000d 40%,transparent 70%);pointer-events:none}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(80% 55% at 50% 0,transparent 40%,var(--s0) 78%);pointer-events:none}
.hero-in{position:relative;z-index:1;max-width:840px;margin:0 auto}
.hero-logo{display:block;margin:0 auto 22px;height:auto;max-width:min(380px,74vw)}
:root[data-theme="light"] .hero-logo{display:none}
.tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:500;color:var(--ink2);background:var(--s1);border:1px solid var(--stroke);border-radius:999px;padding:6px 14px;margin-bottom:26px}
.tag b{color:var(--acc-text);font-weight:700}
.dot{width:6px;height:6px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}
h1{font-size:clamp(34px,6.2vw,60px);line-height:1.05;letter-spacing:-.03em;font-weight:800;margin:0 0 20px}
h1 .g{color:var(--acc-text)}
.hero p.lede{margin:0 auto 32px;font-size:clamp(17px,2.3vw,20px);color:var(--ink2)}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.term{max-width:600px;margin:44px auto 0;text-align:left;background:var(--s1);border:1px solid var(--stroke);border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.35)}
.term-bar{display:flex;align-items:center;gap:7px;padding:11px 14px;border-bottom:1px solid var(--stroke);background:var(--s2)}
.term-bar i{width:11px;height:11px;border-radius:50%;background:var(--s4)}
.term-bar span{margin-left:8px;font-size:12px;color:var(--muted);font-family:var(--font-mono)}
.term pre{margin:0;padding:18px 20px;font-size:13.5px;line-height:1.85;color:var(--ink);overflow-x:auto}
.term .p{color:var(--gold)} .term .o{color:var(--ink2)}

section{padding:72px 0;position:relative}
.band{border-top:1px solid var(--stroke);background:linear-gradient(180deg,var(--s1),var(--s0))}
.head{max-width:680px;margin-bottom:44px}
.head.center{margin-left:auto;margin-right:auto;text-align:center}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)} .g3{grid-template-columns:repeat(3,1fr)}
@media (max-width:880px){.g3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.g2,.g3{grid-template-columns:1fr}}
.card{background:var(--s2);border:1px solid var(--stroke);border-radius:var(--radius-lg);padding:24px;transition:border-color .15s,transform .15s cubic-bezier(.4,0,.2,1)}
.card:hover{border-color:var(--stroke2);transform:translateY(-2px)}
.card h3{margin:0 0 8px;font-size:18px;font-weight:600;letter-spacing:-.01em}
.card p{margin:0;color:var(--ink2);font-size:14.5px}
.ico{width:40px;height:40px;border-radius:var(--radius);display:grid;place-items:center;background:var(--gold-soft);color:var(--gold);margin-bottom:16px;border:1px solid #ffd7002e}
.ico svg{width:21px;height:21px}
.num{width:34px;height:34px;border-radius:var(--radius);display:grid;place-items:center;font-weight:800;font-size:15px;color:var(--gold);background:var(--gold-soft);border:1px solid #ffd7002e;margin-bottom:15px}
.kicker{color:var(--acc-text);font-weight:600;font-size:12px;letter-spacing:.06em;text-transform:uppercase;margin:0 0 6px}
.steps{display:grid;gap:12px;max-width:820px}
.step{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start;background:var(--s2);border:1px solid var(--stroke);border-radius:var(--radius-lg);padding:18px 20px}
.step .n{width:28px;height:28px;border-radius:var(--radius-sm);background:var(--gold);color:var(--on-gold);font-weight:800;display:grid;place-items:center;font-size:14px}
.step b{display:block;margin-bottom:2px;font-size:15.5px} .step span{color:var(--ink2);font-size:14px}
.step code,.card code,details code{background:var(--gold-soft);color:var(--acc-text);padding:1px 6px;border-radius:5px;font-size:12.5px;font-family:var(--font-mono)}
.cols{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;align-items:start}
@media (max-width:820px){.cols{grid-template-columns:1fr}}
pre.code{background:var(--s2);border:1px solid var(--stroke);border-radius:var(--radius-lg);padding:18px 20px;margin:0;font-size:13px;line-height:1.8;color:var(--ink);overflow-x:auto}
pre.code .p{color:var(--gold)} pre.code .c{color:var(--muted)}
.faq{max-width:800px;margin:0 auto;display:grid;gap:10px}
details{background:var(--s2);border:1px solid var(--stroke);border-radius:var(--radius-lg);padding:2px 20px}
details[open]{border-color:var(--stroke2)}
summary{cursor:pointer;list-style:none;padding:18px 0;font-weight:600;font-size:16px;display:flex;justify-content:space-between;align-items:center;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--gold);font-weight:700;font-size:20px;line-height:1}
details[open] summary::after{content:"\2212"}
details p{margin:0 0 18px;color:var(--ink2);font-size:15px}
.cta-band{text-align:center;border:1px solid var(--stroke);background:radial-gradient(70% 120% at 50% 0,#ffd70012,transparent 60%),var(--s1);border-radius:calc(var(--radius-lg) + 6px);padding:56px 24px}
footer{border-top:1px solid var(--stroke);padding:40px 0;color:var(--muted);background:var(--s0)}
.foot-in{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.foot-brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink)}
.foot-brand svg,.foot-brand img{width:24px;height:24px}
.foot-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-links a{color:var(--muted);font-size:14px} .foot-links a:hover{color:var(--ink)}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important} html{scroll-behavior:auto}
  .btn:hover,.card:hover{transform:none!important}
}

/* responsive hardening */
html,body{overflow-x:clip}
img,svg,video{max-width:100%;height:auto}
pre{max-width:100%;overflow-x:auto}
code{overflow-wrap:anywhere}
.nav-in,.hero-in,.cols,.cols>*,.grid,.steps,.step,.card,.faq,.cta,.foot-in,.term,.head,.head>*{min-width:0}
@media (max-width:820px){ section{padding:56px 0} .hero{padding:78px 0 54px} }
@media (max-width:600px){
  .wrap{padding:0 18px}
  .nav-in{gap:10px}
  .nav .btn-gold{display:none}
  section{padding:48px 0}
  .hero{padding:60px 0 44px}
  .head{margin-bottom:30px}
  h1{font-size:clamp(28px,7.5vw,40px)}
  .cta{flex-direction:column}
  .cta .btn{width:100%;justify-content:center}
  .term{margin-top:30px}
  .cta-band{padding:40px 18px}
  .foot-in{flex-direction:column;align-items:flex-start;gap:14px}
}