:root{--bg:#0D1117;--bg2:#121821;--card:#161C24;--line:rgba(255,255,255,.10);--ink:#F2F5F8;--slate:#A3ADB8;--dim:#6B7580;--teal:#2DD4BF;--maxw:1040px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:"IBM Plex Sans",system-ui,sans-serif;font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--teal)} a:hover{color:#5EEAD4}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:var(--teal);color:#000;padding:8px 12px;border-radius:6px;z-index:99}.skip:focus{left:8px}
header.nav{position:sticky;top:0;z-index:50;background:#000;backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.brand img{height:40px;display:block}
.left{display:flex;align-items:center;gap:22px}
.social{display:flex;gap:6px;align-items:center}
.social a{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;color:var(--slate);border:1px solid var(--line)}
.social a:hover{color:#000;background:var(--teal);border-color:var(--teal)}
.social svg{width:17px;height:17px}
@media(max-width:480px){.nav-in{gap:8px}.nav .wrap{padding:0 14px}.left{gap:8px}.brand img{height:28px;width:auto}.social{gap:3px}.social a{width:28px;height:28px;border-radius:7px}.social svg{width:14px;height:14px}.menu{padding:5px 8px;font-size:15px}}
.links{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.links a{color:var(--slate);text-decoration:none;font-size:15px}.links a:hover,.links a[aria-current]{color:var(--ink)}
.cta-s{font-family:"IBM Plex Mono",monospace;font-size:13px;color:#000!important;background:var(--teal);padding:8px 14px;border-radius:6px}
.menu{display:none;background:none;border:1px solid var(--line);color:var(--ink);border-radius:6px;padding:6px 10px;font:inherit;cursor:pointer}
@media(max-width:820px){.menu{display:block}.links{display:none;position:absolute;top:68px;left:0;right:0;background:#000;flex-direction:column;align-items:flex-start;padding:16px 24px;border-bottom:1px solid var(--line)}.links.open{display:flex}}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--teal)}
h1,h2,h3{font-family:"Space Grotesk",sans-serif;font-weight:600;letter-spacing:-.015em;line-height:1.15}
h1{font-size:clamp(2.1rem,5.4vw,3.5rem);margin:16px 0 16px}
h2{font-size:clamp(1.6rem,3.4vw,2.2rem);margin:0 0 14px}
h3{font-size:1.15rem;margin:0 0 6px}
.lead{color:var(--slate);font-size:19px;max-width:760px}
section{padding:64px 0;border-top:1px solid var(--line)}
section.hero{border-top:0;padding:84px 0 56px;background:linear-gradient(90deg,#0D1117 0%,rgba(13,17,23,.90) 42%,rgba(13,17,23,.30) 66%,rgba(13,17,23,.05) 100%),url(/hero.jpg) right -160px center/auto 118% no-repeat,#0D1117}
section.hero.home{padding:120px 0 104px;min-height:560px}
section.hero .lead{color:#C9D1D9;max-width:620px}
section.hero h1{max-width:680px}
@media(max-width:820px){section.hero{background:linear-gradient(180deg,rgba(0,0,0,.80),rgba(0,0,0,.88)),url(/hero-m.jpg) center/cover no-repeat}section.hero.home{padding:72px 0 64px;min-height:0}}
.btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.btn{display:inline-block;font-weight:600;text-decoration:none;border-radius:10px;padding:14px 22px;font-size:16px}
.btn-p{background:var(--teal);color:#000!important}.btn-p:hover{background:#5EEAD4}
.btn-o{border:1px solid rgba(255,255,255,.35);color:var(--ink)!important}.btn-o:hover{border-color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;margin-top:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px}
.card p{color:var(--slate);font-size:15.5px}
.card .tag{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--teal);letter-spacing:.08em;text-transform:uppercase}
.layer{border-left:4px solid var(--c)}
.layer h3{color:var(--c)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:28px}@media(max-width:820px){.split{grid-template-columns:1fr}}
.prose p{color:var(--slate);margin:0 0 14px;max-width:780px}.prose ul{margin:6px 0 16px 20px;color:var(--slate)}.prose li{margin:4px 0}.prose b{color:var(--ink)}
.prose h2{margin-top:34px}.prose h3{margin-top:22px}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 20px;margin:10px 0}
details summary{cursor:pointer;padding:16px 0;font-weight:600;list-style:none;position:relative;padding-right:28px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";position:absolute;right:0;top:12px;font-size:22px;color:var(--teal)}
details[open] summary::after{content:"–"}
details .a{padding:0 0 18px;color:var(--slate)}.details .a p{margin-bottom:10px}
details ul{margin:8px 0 6px 20px}details li{margin:4px 0}details li b{color:var(--ink)}
.video{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;background:#111;border:1px solid var(--line);margin:14px 0 18px}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.toc a{font-size:14px;border:1px solid var(--line);border-radius:999px;padding:6px 14px;color:var(--slate);text-decoration:none}.toc a:hover{color:var(--ink);border-color:var(--slate)}
.band{background:var(--bg2)}
footer{border-top:1px solid var(--line);padding:48px 0 36px;color:var(--slate);font-size:15px;background:#000}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}@media(max-width:820px){footer .cols{grid-template-columns:1fr}}
footer h4{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink);margin-bottom:10px;font-weight:500}
footer a{color:var(--slate);text-decoration:none}footer a:hover{color:var(--ink)}
footer li{list-style:none;margin:5px 0}
.legal{margin-top:30px;padding-top:18px;border-top:1px solid var(--line);font-size:13px;color:var(--dim);display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between;align-items:center}
.anpc img{display:block;border-radius:6px}
.note{font-size:14px;color:var(--dim)}