/* ===== 1. COLOURS (change here only) ===== */
:root{
  --bg:#090C16;          /* deep ledger black */
  --panel:#11172A;
  --panel2:#172038;
  --ink:#EDF1FB;
  --muted:#9AA6C3;
  --line:#222C4A;
  --gold:#FFC24B;        /* main accent: chain gold */
  --blue:#4C8DFF;
  --mint:#2EE6A8;
  --red:#FF5C6C;
  --glow:0 0 28px rgba(255,194,75,.28);
}
/* ===== 2. BASE ===== */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.75 "Inter",system-ui,-apple-system,"Segoe UI",sans-serif}
h1,h2,h3{font-family:"Space Grotesk","Inter",sans-serif;line-height:1.2;margin:0 0 .5em;color:#fff}
h1{font-size:clamp(2.2rem,5.4vw,3.8rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.7rem,3.4vw,2.3rem);font-weight:700;letter-spacing:-.01em}
h2::after{content:"";display:block;width:70px;height:5px;margin-top:12px;border-radius:3px;background:linear-gradient(90deg,var(--gold),var(--blue))}
h3{font-size:1.12rem;font-weight:700}
.sub{margin-top:50px;color:var(--gold);font-family:"JetBrains Mono",ui-monospace,monospace;font-size:1rem}
.sub::before{content:"# ";color:var(--blue)}
p{margin:0 0 1em;max-width:72ch}
a{color:var(--blue)}
mark{background:rgba(255,194,75,.16);color:#FFD98A;padding:1px 7px;border-radius:5px;font-weight:600}
:focus-visible{outline:3px solid var(--mint);outline-offset:2px}
.hl{background:linear-gradient(90deg,var(--gold),var(--blue));-webkit-background-clip:text;background-clip:text;color:transparent}
.code-tag{display:inline-block;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.78rem;font-weight:700;color:var(--mint);background:rgba(46,230,168,.1);border:1px solid rgba(46,230,168,.4);padding:3px 12px;border-radius:999px;margin-bottom:14px}
/* ===== 3. NAV ===== */
nav.top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;background:#05070E;padding:14px max(24px,calc((100% - 1060px)/2))}
.brand{font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:1.1rem;display:flex;align-items:center;letter-spacing:.02em}
.brand b{color:var(--gold)}
.cube{margin-right:12px;width:14px;height:14px;border:3px solid var(--gold);transform:rotate(45deg);box-shadow:0 0 12px var(--gold);animation:spin 8s linear infinite}
nav.top ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:2px}
nav.top a{display:block;color:var(--muted);text-decoration:none;font-size:.86rem;font-weight:500;padding:7px 11px;border-radius:999px}
nav.top a:hover{color:#fff;background:rgba(255,194,75,.14)}
/* ===== 4. HERO (centered) + ANIMATED CHAIN ===== */
.hero{padding:60px max(24px,calc((100% - 1060px)/2)) 84px;text-align:center;background:radial-gradient(ellipse at 50% 0%,rgba(76,141,255,.22),transparent 62%),radial-gradient(circle,rgba(154,166,195,.16) 1px,transparent 1px) 0 0/28px 28px,var(--bg)}
.hero>p{margin-left:auto;margin-right:auto}
.lead{font-size:1.18rem;color:var(--muted)}
.btn{display:inline-block;background:var(--gold);color:#1B1300;font-weight:700;padding:13px 28px;border-radius:999px;text-decoration:none;box-shadow:var(--glow)}
.btn:hover{filter:brightness(1.1)}
.btn.ghost{background:transparent;color:var(--ink);border:2px solid var(--blue);margin-left:12px;box-shadow:none}
.btn.ghost:hover{background:rgba(76,141,255,.2)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:46px auto 0;max-width:940px;text-align:left}
.stat{background:rgba(17,23,42,.85);border:1px solid var(--line);border-radius:14px;padding:16px 20px;color:var(--muted);font-size:.93rem}
.stat b{display:block;font-family:"Space Grotesk",sans-serif;font-size:1.15rem;color:var(--gold)}

/* blocks in a chain: sized in em so the whole picture scales on small screens */
.bchain{position:relative;display:flex;align-items:center;justify-content:center;width:max-content;max-width:100%;margin:0 auto 28px;font-size:clamp(7px,2.1vw,12.5px)}
.blk{width:9em;padding:1em;background:var(--panel2);border:.2em solid var(--line);border-radius:1em;text-align:left;font-family:"JetBrains Mono",ui-monospace,monospace;line-height:1.55;animation:lit 6s ease-in-out infinite}
.blk b{display:block;color:var(--gold);font-size:1.1em;margin-bottom:.4em}
.blk span{display:block;color:var(--muted);font-size:.95em}
.bchain .blk:nth-of-type(1){animation-delay:.5s}
.bchain .blk:nth-of-type(2){animation-delay:1.7s}
.bchain .blk:nth-of-type(3){animation-delay:2.9s}
.bchain .blk:nth-of-type(4){animation-delay:4.1s}
.link{width:2.4em;height:.4em;flex:none;background:repeating-linear-gradient(90deg,var(--blue) 0 .55em,transparent .55em .95em);animation:flow 1s linear infinite}
.link.broken{background:repeating-linear-gradient(90deg,var(--red) 0 .45em,transparent .45em 1.1em);animation:none}
.packet{position:absolute;top:50%;left:0;width:1.1em;height:1.1em;margin-top:-.55em;border-radius:50%;background:var(--gold);box-shadow:0 0 1.4em var(--gold);z-index:2;animation:travel 6s ease-in-out infinite}
.bchain.static{margin:24px auto}
.bchain.static .blk{animation:none}
.blk.bad{border-color:var(--red);box-shadow:0 0 1.4em rgba(255,92,108,.35)}
.blk.bad b{color:var(--red)}
/* ===== 5. SECTIONS ===== */
section{padding:80px max(24px,calc((100% - 1060px)/2));border-top:1px solid var(--line)}
section:nth-of-type(even){background:#0C101D}
/* ===== 6. CARDS AND BOXES ===== */
.grid,.two{display:grid;gap:18px;margin-top:24px}
.grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.two{grid-template-columns:repeat(auto-fit,minmax(290px,1fr))}
.card{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px;transition:transform .25s,border-color .25s,box-shadow .25s}
.card::before{content:"";position:absolute;left:24px;top:0;width:44px;height:3px;border-radius:0 0 3px 3px;background:linear-gradient(90deg,var(--gold),var(--blue))}
.card:hover{transform:translateY(-4px);border-color:var(--gold);box-shadow:var(--glow)}
.card p{margin:0;font-size:.96rem;color:var(--muted)}
.card ul{margin:0;padding-left:20px;color:var(--muted)}
.card li{margin-bottom:.5em}
.card li::marker{color:var(--gold)}
.tag{display:inline-block;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.7rem;font-weight:700;color:var(--blue);background:rgba(76,141,255,.14);padding:2px 10px;border-radius:6px;margin-bottom:12px;letter-spacing:.05em}
.key{background:linear-gradient(90deg,rgba(255,194,75,.16),rgba(255,194,75,.04));border:1px solid rgba(255,194,75,.5);border-left:8px solid var(--gold);border-radius:12px;padding:18px 24px;margin:28px 0}
.key b{display:inline-block;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.74rem;letter-spacing:.1em;color:#1B1300;background:var(--gold);padding:2px 10px;border-radius:5px;margin-bottom:8px}
.key p{margin:0;color:var(--ink)}
.key.warn{background:linear-gradient(90deg,rgba(255,92,108,.16),rgba(255,92,108,.04));border-color:rgba(255,92,108,.55);border-left-color:var(--red)}
.key.warn b{background:var(--red);color:#fff}
.essay{background:var(--panel);border:1px solid var(--line);border-left:6px solid var(--gold);border-radius:16px;padding:30px 34px;margin-top:20px}
.essay p{max-width:none;color:var(--muted);text-align:justify}
.essay p:last-child{margin-bottom:0}
/* ===== 7. STEPS, PIPELINE, TIMELINE ===== */
ol.steps{list-style:none;counter-reset:s;padding:0;margin:26px 0 0;display:grid;gap:12px}
ol.steps li{counter-increment:s;display:grid;grid-template-columns:50px 1fr;gap:18px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 22px}
ol.steps li::before{content:counter(s);width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--gold),#FF9F2E);color:#1B1300;font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:1.1rem;display:grid;place-items:center}
ol.steps p{margin:0;color:var(--muted)}
ol.steps h3{margin-bottom:.3em}
ol.pipe{list-style:none;counter-reset:p;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;padding:0;margin:26px 0}
ol.pipe li{counter-increment:p;position:relative;background:var(--panel);border:1px solid var(--line);border-top:3px solid var(--gold);border-radius:14px;padding:18px}
ol.pipe li:nth-child(even){border-top-color:var(--blue)}
ol.pipe li::before{content:"0" counter(p);font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.8rem;color:var(--mint)}
ol.pipe b{display:block;font-family:"Space Grotesk",sans-serif;font-size:1.02rem;color:#fff}
ol.pipe span{font-size:.93rem;color:var(--muted)}
ol.tl{list-style:none;margin:30px 0 0;padding:0 0 0 38px;position:relative}
ol.tl::before{content:"";position:absolute;left:10px;top:6px;bottom:6px;width:4px;border-radius:3px;background:repeating-linear-gradient(180deg,var(--gold) 0 16px,var(--blue) 16px 32px)}
ol.tl li{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:14px}
ol.tl li::before{content:"";position:absolute;left:-38px;top:22px;width:20px;height:20px;background:var(--bg);border:4px solid var(--gold);transform:rotate(45deg);box-shadow:0 0 12px var(--gold)}
ol.tl li:nth-child(even)::before{border-color:var(--blue);box-shadow:0 0 12px var(--blue)}
ol.tl b{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.92rem;color:var(--mint)}
ol.tl h3{margin:2px 0 6px}
ol.tl p{margin:0;font-size:.96rem;color:var(--muted)}
/* ===== 8. TABLE, CODE, TERMS, FAQ ===== */
.scroll{overflow-x:auto;margin-top:22px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:.95rem}
th,td{text-align:left;padding:13px 18px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#0A0F1D;color:var(--gold);font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.8rem;letter-spacing:.05em;text-transform:uppercase}
td:first-child{color:#fff;font-weight:700}
td{color:var(--muted)}
tr:last-child td{border-bottom:0}
tbody tr:hover td{background:var(--panel2)}
pre.code{background:#05070E;border:1px solid var(--line);border-left:6px solid var(--gold);border-radius:12px;padding:22px;overflow-x:auto;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.86rem;color:#FFE2A6;margin:22px 0}
dl{display:grid;grid-template-columns:minmax(150px,240px) 1fr;margin:22px 0 0;background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden}
dt,dd{padding:13px 20px;border-bottom:1px solid var(--line);margin:0}
dt{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.88rem;color:var(--gold)}
dd{color:var(--muted)}
dt:last-of-type,dd:last-of-type{border-bottom:0}
details{background:var(--panel);border:1px solid var(--line);border-left:5px solid var(--blue);border-radius:12px;padding:15px 22px;margin-bottom:12px}
details[open]{border-left-color:var(--gold)}
summary{cursor:pointer;font-weight:700;color:#fff}
details p{margin:12px 0 0;color:var(--muted)}
/* ===== 9. FOOTER ===== */
footer{background:#05070E;color:var(--muted);text-align:center;padding:34px 20px 46px;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:.8rem;border-top:3px solid var(--gold)}
/* ===== 10. ANIMATION + RESPONSIVE ===== */
@keyframes spin{to{transform:rotate(405deg)}}
@keyframes flow{to{background-position:.95em 0}}
@keyframes travel{0%{left:0;opacity:0}6%{opacity:1}80%{left:calc(100% - 1.1em);opacity:1}90%,100%{left:calc(100% - 1.1em);opacity:0}}
@keyframes lit{0%,16%{border-color:var(--gold);box-shadow:0 0 1.6em rgba(255,194,75,.45)}28%,100%{border-color:var(--line);box-shadow:none}}
@media(max-width:600px){
  .btn.ghost{margin:12px 0 0}
  .essay{padding:22px}.essay p{text-align:left}
  ol.steps li{grid-template-columns:1fr}
  dl{grid-template-columns:1fr}dt{border-bottom:0;padding-bottom:0}
  ol.tl{padding-left:32px}ol.tl li::before{left:-32px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}