:root{--bg:#fff;--ink:#0d0d0d;--muted:#646464;--soft:#f7f8f6;--line:#00000012;--line-strong:#0000001f;--green:#18e299;--green-deep:#08734e;--pink:#ff056d;--pink-soft:#fff0f6;--shadow:0 24px 80px #00000014}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:radial-gradient(circle at 12% 8%, #18e29924, transparent 30%), radial-gradient(circle at 88% 18%, #ff056d1c, transparent 28%), var(--bg);color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}p{color:var(--muted);font-size:17px;line-height:1.7}strong{color:var(--ink)}.nav{z-index:20;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffc7;justify-content:space-between;align-items:center;padding:16px 24px;display:flex;position:sticky;top:0}.brand{align-items:center;gap:10px;font-weight:800;display:flex}.brand-mark{background:var(--ink);width:34px;height:34px;color:var(--green);border-radius:12px;place-items:center;display:inline-grid;box-shadow:0 10px 30px #18e29940}nav{color:var(--muted);flex-wrap:wrap;justify-content:flex-end;gap:14px;font-size:13px;font-weight:650;display:flex}nav a:hover{color:var(--ink)}.hero{flex-direction:column;justify-content:center;max-width:1120px;min-height:76vh;margin:0 auto;padding:118px 24px 84px;display:flex;position:relative;overflow:hidden}.halo{filter:blur(12px);z-index:-1;background:radial-gradient(circle,#18e29947,#0000 63%);border-radius:999px;width:360px;height:360px;position:absolute;top:22%;right:7%}.eyebrow{color:var(--green-deep);text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:850}h1{letter-spacing:-.075em;max-width:970px;margin:18px 0 20px;font-size:clamp(44px,7.2vw,88px);line-height:.96}.lede{color:#303030;max-width:780px;font-size:clamp(18px,2vw,24px)}.hero-actions{flex-wrap:wrap;gap:12px;margin:28px 0;display:flex}.btn{border:1px solid var(--line-strong);border-radius:999px;justify-content:center;align-items:center;min-height:46px;padding:0 18px;font-weight:800;display:inline-flex}.btn.primary{background:var(--ink);color:#fff;box-shadow:var(--shadow)}.btn.secondary{color:var(--ink);background:#fff}.notice{background:var(--pink-soft);color:#623044;border:1px solid #ff056d38;border-radius:18px;max-width:800px;padding:16px 18px;line-height:1.55}.section{max-width:1180px;margin:0 auto;padding:88px 24px}.section-head{max-width:760px;margin-bottom:34px}.section-head.wide{max-width:940px}h2{letter-spacing:-.052em;margin:18px 0 0;font-size:clamp(32px,4.6vw,56px);line-height:1.04}h3{letter-spacing:-.02em;margin:0 0 10px;font-size:21px}.split{grid-template-columns:1.05fr .95fr;align-items:center;gap:54px;display:grid}.reverse{grid-template-columns:.95fr 1.05fr}.card,.layer,.trouble,.story-card,.tech-card,.layer-row{border:1px solid var(--line);background:#ffffffdb;border-radius:26px;padding:26px;box-shadow:0 14px 50px #0000000b}.checklist ul,.card ul{color:var(--muted);margin:16px 0 0;padding-left:20px;line-height:1.75}.cards{gap:18px;display:grid}.three{grid-template-columns:repeat(3,1fr)}.two{grid-template-columns:repeat(2,1fr)}.concept-card{min-height:220px}.big-answer{color:#fff;background:linear-gradient(145deg,#101010,#1a1a1a);border-color:#ffffff1f}.big-answer p,.big-answer strong{color:#ffffffd1}.qns-section{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.glossary{grid-template-columns:repeat(2,1fr);gap:14px;display:grid}.stack-list .gloss{align-items:start}.gloss{border:1px solid var(--line);background:#fff;border-radius:20px;grid-template-columns:170px 1fr;gap:18px;padding:18px;display:grid}dt{font-weight:850}dd{color:var(--muted);margin:0;line-height:1.6}.layer-stack{gap:14px;display:grid}.layer-row{grid-template-columns:46px 1fr;align-items:start;gap:16px;padding:20px;display:grid}.layer-row span,.step span,.layer span{background:var(--ink);width:38px;height:38px;color:var(--green);border-radius:999px;place-items:center;font-weight:900;display:inline-grid}.layer-row h3{margin:0 0 4px}.layer-row p{margin:0;font-size:15px}.passkeys{background:linear-gradient(#fff,#fafffc);max-width:none;padding-left:max(24px,50vw - 590px);padding-right:max(24px,50vw - 590px)}.timeline{gap:12px;display:grid}.step{background:#18e2990f;border-radius:18px;grid-template-columns:44px 1fr;align-items:start;gap:14px;padding:14px;display:grid}.step p{margin:3px 0 0;font-size:16px}.tech-grid{grid-template-columns:repeat(4,1fr);gap:16px;display:grid}.tech-card{min-height:230px;padding:22px}.tech-card h3{font-size:19px}.tech-card p{margin-bottom:0;font-size:15px}.story-section{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(#fbfffd,#fff);max-width:none;padding-left:max(24px,50vw - 590px);padding-right:max(24px,50vw - 590px)}.story-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.story-card{min-height:215px}.story-card span{color:var(--pink);letter-spacing:.06em;text-transform:uppercase;font-size:13px;font-weight:900}.story-card h3{margin-top:10px}.story-card p{margin-bottom:0;font-size:15px}.danger-zone{color:#fff;background:#0f0f0f;max-width:none;padding-left:max(24px,50vw - 590px);padding-right:max(24px,50vw - 590px)}.danger-zone p{color:#ffffffb8}.danger-zone .eyebrow{color:var(--green)}.danger-zone .card{background:#181818;border-color:#ffffff1a}.danger-zone .card p{color:#ffffffad}.faq-list{gap:12px;display:grid}.mini-list{gap:12px;margin-top:20px;display:grid}.mini-item{border-left:4px solid var(--green);background:linear-gradient(90deg,#18e29914,#0000);border-radius:0 18px 18px 0;padding:14px 0 14px 18px}.mini-item p{margin:6px 0 0;font-size:15px}details{border:1px solid var(--line);background:#fff;border-radius:20px;padding:18px 20px}summary{cursor:pointer;font-size:18px;font-weight:850}details p{margin-bottom:0}.sources .card{background:#fbfbfb}.sources li{margin-bottom:10px}footer{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:24px;max-width:1180px;margin:0 auto;padding:42px 24px 70px;display:flex}footer p{margin:6px 0 0}@media (max-width:1000px){.tech-grid{grid-template-columns:repeat(2,1fr)}.story-grid,.three{grid-template-columns:1fr 1fr}}@media (max-width:820px){.nav nav{display:none}.split,.reverse,.glossary,.two,.three,.story-grid,.tech-grid{grid-template-columns:1fr}.section{padding:62px 20px}.hero{padding-top:86px}.gloss{grid-template-columns:1fr;gap:6px}h1{font-size:clamp(42px,14vw,66px)}footer{flex-direction:column;align-items:flex-start}}