:root{
  --paper:#E8E9E3;
  --paper-2:#DFE1DA;
  --plate:#F1F2EC;
  --ink:#15181A;
  --slate:#565D5B;
  --slate-2:#767C79;
  --patina:#2C6350;
  --patina-strong:#1F4A3C;
  --patina-soft:rgba(44,99,80,.10);
  --rule:rgba(21,24,26,.13);
  --rule-soft:rgba(21,24,26,.07);
  --shadow:0 1px 0 rgba(21,24,26,.05), 0 22px 44px -30px rgba(21,24,26,.45);
  --maxw:1140px;
  --pad:clamp(20px,5vw,64px);
  --rust-strong:#A8412E;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Archivo",system-ui,-apple-system,sans-serif;
  font-size:clamp(16px,1.05vw,17.5px);
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--patina);color:var(--plate)}

a{color:inherit}
.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}

.display{
  font-family:"Archivo Expanded","Archivo",system-ui,sans-serif;
  font-weight:800;
  letter-spacing:-.02em;
  line-height:.99;
}
.eyebrow{
  font-family:"IBM Plex Mono",ui-monospace,monospace;
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--patina-strong);
  display:inline-flex;
  align-items:center;
  gap:.6em;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--patina)}
.mono{font-family:"IBM Plex Mono",ui-monospace,monospace}
.lede{color:var(--slate);font-size:1.12rem;max-width:56ch}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--paper) 86%, transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--rule-soft)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:inline-flex;align-items:center;gap:11px;font-family:"Archivo Expanded",sans-serif;font-weight:700;letter-spacing:-.01em;font-size:1.06rem;text-decoration:none}
.brand svg{display:block}
.brand__mark{width:26px;height:26px;border-radius:6px;overflow:hidden;display:inline-flex;flex:none;box-shadow:inset 0 0 0 1px rgba(230,223,206,.10),0 0 0 1px var(--rule)}
.brand__mark svg{width:100%;height:100%}
.nav__links{display:flex;align-items:center;gap:28px}
.nav__links a{font-size:.86rem;color:var(--slate);text-decoration:none;transition:color .18s}
.nav__links a:hover{color:var(--ink)}
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:"IBM Plex Mono",monospace;font-size:.82rem;
  padding:.62em 1em;border-radius:8px;text-decoration:none;
  border:1px solid var(--patina);color:var(--patina-strong);
  background:var(--patina-soft);transition:background .18s,color .18s,border-color .18s;
}
.btn:hover{background:var(--patina);color:var(--plate);border-color:var(--patina)}
.btn--solid{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--solid:hover{background:var(--patina-strong);border-color:var(--patina-strong);color:var(--plate)}
@media(max-width:720px){.nav__links a.hide-sm{display:none}}

/* ---------- hero ---------- */
.hero{padding-top:clamp(52px,8vw,104px);padding-bottom:clamp(52px,8vw,96px)}
.hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(36px,5vw,72px);align-items:center}
.hero h1{font-size:clamp(2.7rem,6.4vw,5.15rem);margin:.5rem 0 0}
.hero h1 .soft{color:var(--slate-2)}
.hero__sub{margin-top:1.4rem}
.beats{margin-top:1.9rem;display:flex;flex-wrap:wrap;gap:.55rem;align-items:center;font-family:"IBM Plex Mono",monospace;font-size:.83rem;color:var(--ink)}
.beats b{font-weight:500}
.beats .dot{color:var(--patina)}
.hero__cta{margin-top:2.3rem;display:flex;flex-wrap:wrap;gap:12px}
@media(max-width:860px){
  .hero__grid{grid-template-columns:1fr;gap:44px}
  .hero__figure{order:2}
}

/* ---------- strata signature ---------- */
.figure{
  background:linear-gradient(180deg,var(--plate),var(--paper-2));
  border:1px solid var(--rule);border-radius:16px;
  padding:20px 20px 22px;box-shadow:var(--shadow);
}
.figure__head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.figure__head .t{font-family:"IBM Plex Mono",monospace;font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--slate)}
.figure__head .live{display:inline-flex;align-items:center;gap:.5em;font-family:"IBM Plex Mono",monospace;font-size:.68rem;color:var(--patina-strong)}
.figure__head .live i{width:7px;height:7px;border-radius:50%;background:var(--patina);box-shadow:0 0 0 3px var(--patina-soft)}

.strata{position:relative;min-height:214px;padding-right:126px}
.stratum{
  position:absolute;left:calc(var(--i)*22px);top:calc(var(--i)*30px);
  width:calc(100% - 126px - (var(--imax) - var(--i))*22px);
  height:86px;z-index:calc(20 - var(--i));
  background:var(--plate);border:1px solid var(--rule);border-radius:11px;
  padding:13px 15px;display:flex;flex-direction:column;justify-content:center;gap:5px;
  box-shadow:0 12px 26px -22px rgba(21,24,26,.7);
  opacity:var(--op);
  transform:translateY(10px);animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards;
  animation-delay:calc(var(--i)*90ms + 120ms);
}
@keyframes rise{to{transform:translateY(0)}}
.stratum .k{font-family:"IBM Plex Mono",monospace;font-size:.82rem;color:var(--ink)}
.stratum .k .role{color:var(--patina-strong)}
.stratum .m{font-size:.71rem;color:var(--slate-2)}
.stratum--front{border-color:var(--patina);box-shadow:0 18px 34px -22px rgba(31,74,60,.6)}

.seal{
  position:absolute;right:0;top:calc(var(--i)*30px + 43px);transform:translateY(-50%);
  display:flex;align-items:center;gap:9px;z-index:30;opacity:var(--op);
  animation:fadein .6s ease forwards;animation-delay:calc(var(--i)*90ms + 300ms);
  opacity:0;
}
@keyframes fadein{to{opacity:var(--op)}}
.seal .h{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--slate)}
.seal .s{width:13px;height:13px;border-radius:3px;border:1.5px solid var(--patina);background:var(--patina-soft);position:relative}
.seal--front .s{background:var(--patina)}
.spine{position:absolute;right:5.5px;top:43px;bottom:auto;height:calc(var(--imax)*30px);width:1.5px;background:linear-gradient(180deg,var(--patina),rgba(44,99,80,.25));z-index:10}
.figure__cap{margin-top:20px;padding-top:15px;border-top:1px solid var(--rule-soft);font-size:.86rem;color:var(--slate);line-height:1.55}

/* ---------- constraint band ---------- */
.band{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--paper-2)}
.band__in{padding-block:clamp(46px,6vw,78px);display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(28px,4vw,56px)}
.band h2{font-size:clamp(1.7rem,3.4vw,2.6rem);margin:.4rem 0 0}
.band p{color:var(--slate);margin:.2rem 0}
.band p + p{margin-top:1rem}
.band .roster{display:flex;flex-wrap:wrap;gap:8px;margin-top:1.4rem}
.chip{font-family:"IBM Plex Mono",monospace;font-size:.75rem;color:var(--ink);border:1px solid var(--rule);border-radius:999px;padding:.4em .85em;background:var(--plate)}
@media(max-width:800px){.band__in{grid-template-columns:1fr;gap:26px}}

/* ---------- sections ---------- */
section.blk{padding-block:clamp(58px,8vw,110px)}
.blk__head{max-width:60ch}
.blk__head h2{font-size:clamp(1.9rem,4vw,3rem);margin:.6rem 0 0}
.blk__head p{color:var(--slate);margin-top:1rem}

/* capabilities */
.caps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px}
.cap{
  border:1px solid var(--rule);border-radius:14px;background:var(--plate);
  padding:26px 24px 28px;position:relative;overflow:hidden;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.cap:hover{transform:translateY(-3px);border-color:var(--patina);box-shadow:0 20px 40px -30px rgba(31,74,60,.6)}
.cap__n{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--patina-strong);letter-spacing:.12em}
.cap h3{font-family:"Archivo Expanded",sans-serif;font-weight:700;font-size:1.24rem;letter-spacing:-.01em;margin:.5rem 0 .1rem}
.cap p{color:var(--slate);font-size:.96rem;margin:.6rem 0 0}
.cap .tag{display:inline-block;margin-top:1.1rem;font-family:"IBM Plex Mono",monospace;font-size:.7rem;color:var(--slate-2);border-top:1px solid var(--rule-soft);padding-top:.8rem;width:100%}
.caps__note{margin-top:26px;font-size:.94rem;color:var(--slate);max-width:74ch;border-left:2px solid var(--patina);padding-left:16px}

/* Design tenets strip */
.tenets{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:34px;padding-top:26px;border-top:1px solid var(--rule)}
.tenets b{display:block;font-family:"Archivo Expanded",sans-serif;font-weight:600;font-size:.98rem;letter-spacing:-.01em;margin-bottom:.45rem}
.tenets p{font-size:.9rem;color:var(--slate);margin:0;line-height:1.55}
@media(max-width:760px){.tenets{grid-template-columns:1fr}}

/* Chain demo (record section) */
.cdemo{background:var(--paper);border:1px solid rgba(232,233,227,.14);border-radius:18px;padding:28px 24px 22px;max-width:640px;margin:36px auto 10px;color:var(--ink)}
.cdemo-stage{transition:opacity .5s ease}
.cdemo-stage.fading{opacity:0}
.cdemo-hdr{text-align:center;font-family:"Archivo Expanded","Archivo",sans-serif;font-weight:700;letter-spacing:-.01em;font-size:1.18rem;color:var(--ink);margin-bottom:14px;display:flex;align-items:center;justify-content:center;gap:8px;min-height:1.4em;opacity:0;transition:color .4s ease,opacity .5s ease}
.cdemo-hdr .mark{flex-shrink:0;opacity:0;transition:opacity .3s ease}
.cdemo-hdr.ok{color:var(--patina-strong);opacity:1}
.cdemo-hdr.ok .ok-mark{opacity:1}
.cdemo-hdr.bad{color:var(--rust-strong);opacity:1}
.cdemo-hdr.bad .bad-mark{opacity:1}
.cdemo-note{text-align:center;font-family:"IBM Plex Mono",ui-monospace,monospace;font-size:.92rem;color:var(--patina-strong);min-height:1.5em;margin-bottom:14px;opacity:0;transform:translateY(4px);transition:opacity .35s ease,transform .35s ease}
.cdemo-note.in{opacity:1;transform:none}
.cdemo-window{background:linear-gradient(180deg,var(--plate),var(--paper-2));border:1px solid var(--rule);border-radius:14px;padding:4px 18px;min-height:40px}
.cdemo-row{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 14px;padding:13px 0;border-bottom:1px solid var(--rule-soft);opacity:0;transform:translateY(-12px);transition:opacity .4s ease,transform .4s ease;overflow:hidden}
.cdemo-row.in{opacity:1;transform:none}
.cdemo-row:last-child{border-bottom:none}
.cdemo-row .act{flex:1 1 180px;font-size:.93rem;color:var(--ink)}
.cdemo-row .hsh{display:inline-flex;align-items:center;gap:7px;flex-shrink:0}
.cdemo-row .hsh .s{width:11px;height:11px;border-radius:3px;border:1.5px solid var(--patina);background:var(--patina-soft)}
.cdemo-row .hsh .h{font-family:"IBM Plex Mono",monospace;font-size:.76rem;color:var(--slate)}
@keyframes cdemo-flicker{0%,100%{opacity:1}15%,45%,75%{opacity:.12}30%,60%,90%{opacity:1}}
.cdemo-row.flicker{animation:cdemo-flicker .65s steps(1,end)}
.cdemo-row.collapsing{transition:max-height .45s ease,opacity .45s ease,padding .45s ease;opacity:0;max-height:0!important;padding-top:0;padding-bottom:0}
.cdemo-cap{margin:14px auto 0;max-width:640px;text-align:center;font-size:.82rem;color:#B9BEBB}
@media(max-width:820px){.caps{grid-template-columns:1fr}}

/* record / provenance */
.record{background:var(--ink);color:var(--paper)}
.record .blk__head h2{color:var(--paper)}
.record .blk__head p{color:#B9BEBB}
.record .eyebrow{color:#8FBFAF}
.record .eyebrow::before{background:#8FBFAF}
.prov{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:44px}
.prov__item{border:1px solid var(--rule);border-radius:13px;padding:22px 22px 24px;background:var(--plate)}
.record .prov__item{border-color:rgba(232,233,227,.14);background:rgba(232,233,227,.03)}
.prov__item h4{font-family:"Archivo Expanded",sans-serif;font-weight:600;font-size:1.02rem;margin:0 0 .5rem;letter-spacing:-.01em}
.prov__item p{color:var(--slate);font-size:.92rem;margin:0}
.record .prov__item p{color:#B9BEBB}
.prov__item .mono{color:var(--patina-strong);font-size:.78rem}
.record .prov__item .mono{color:#8FBFAF}
@media(max-width:760px){.prov{grid-template-columns:1fr}}

/* eu regulatory fit */
.reglist{margin-top:40px;border-top:1px solid var(--rule)}
.reg{display:grid;grid-template-columns:minmax(210px,.9fr) 1.4fr;gap:20px 30px;padding:24px 0;border-bottom:1px solid var(--rule);align-items:baseline}
.reg__act{display:flex;flex-direction:column;gap:8px}
.reg__act a{font-family:"Archivo Expanded",sans-serif;font-weight:600;font-size:1.14rem;letter-spacing:-.01em;text-decoration:none;color:var(--ink);display:inline-flex;align-items:center;gap:.42em;width:fit-content;border-bottom:1.5px solid transparent;padding-bottom:1px;transition:border-color .16s,color .16s}
.reg__act a:hover,.reg__act a:focus-visible{color:var(--patina-strong);border-color:var(--patina)}
.reg__act a .arr{color:var(--patina);font-size:.82em}
.reg__cite{font-family:"IBM Plex Mono",monospace;font-size:.74rem;color:var(--slate-2);letter-spacing:.01em}
.reg__note{color:var(--slate);font-size:.98rem;line-height:1.55;margin:0}
.reg__note b{color:var(--ink);font-weight:600}
@media(max-width:720px){.reg{grid-template-columns:1fr;gap:11px;padding:22px 0}}

/* boundary */
.bound{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:44px;border:1px solid var(--rule);border-radius:16px;overflow:hidden;background:var(--plate)}
.bound__col{padding:30px 28px 32px}
.bound__col + .bound__col{border-left:1px solid var(--rule)}
.bound__col h3{font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;margin:0 0 20px}
.bound__col.give h3{color:var(--patina-strong)}
.bound__col.keep h3{color:var(--slate)}
.bound__col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px}
.bound__col li{display:flex;gap:12px;font-size:.96rem;line-height:1.5}
.bound__col li b{font-weight:600}
.bound__col li span{color:var(--slate);display:block;font-size:.88rem;margin-top:1px}
.mark{flex:none;width:18px;height:18px;margin-top:2px}
.bound__foot{margin-top:26px;font-size:.98rem;color:var(--ink);max-width:80ch}
.bound__foot b{color:var(--patina-strong)}
@media(max-width:760px){
  .bound{grid-template-columns:1fr}
  .bound__col + .bound__col{border-left:0;border-top:1px solid var(--rule)}
}

/* start */
.start{background:var(--paper-2);border-top:1px solid var(--rule)}
.start__grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,4vw,60px);align-items:center}
.term{background:var(--ink);border-radius:14px;padding:18px 18px 20px;box-shadow:var(--shadow);font-family:"IBM Plex Mono",monospace;font-size:.9rem;color:var(--paper)}
.term__bar{display:flex;gap:7px;margin-bottom:16px}
.term__bar i{width:11px;height:11px;border-radius:50%;background:rgba(232,233,227,.25)}
.term__bar i:first-child{background:var(--patina)}
.term__line{display:flex;align-items:center;gap:10px}
.term__line .p{color:#8FBFAF}
.term__line .c{color:var(--paper)}
.copy{margin-left:auto;background:transparent;border:1px solid rgba(232,233,227,.24);color:#B9BEBB;font-family:inherit;font-size:.72rem;border-radius:6px;padding:.35em .7em;cursor:pointer;transition:.16s}
.copy:hover{color:var(--paper);border-color:var(--patina)}
.term__hint{margin-top:14px;color:#8A918E;font-size:.76rem}
.start__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
@media(max-width:820px){.start__grid{grid-template-columns:1fr;gap:34px}}

/* footer */
footer{border-top:1px solid var(--rule);padding-block:44px;background:var(--paper)}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px;align-items:flex-start}
.foot__links{display:flex;flex-wrap:wrap;gap:24px}
.foot__links a{font-size:.86rem;color:var(--slate);text-decoration:none;transition:color .16s}
.foot__links a:hover{color:var(--patina-strong)}
.foot__meta{font-family:"IBM Plex Mono",monospace;font-size:.74rem;color:var(--slate-2);text-align:right;line-height:1.7}

:focus-visible{outline:2px solid var(--patina);outline-offset:3px;border-radius:4px}

[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
[data-reveal].in{opacity:1;transform:none}

@media (prefers-reduced-motion: reduce){
  *{animation:none !important}
  [data-reveal]{opacity:1 !important;transform:none !important;transition:none}
  .stratum,.seal{transform:none !important;opacity:var(--op) !important}
}

/* ---------- doc pages (subpages) ---------- */
.doc{padding-block:clamp(40px,6vw,80px)}
.doc__in{max-width:760px}
.crumbs{font-family:"IBM Plex Mono",monospace;font-size:.74rem;color:var(--slate-2);margin-bottom:1.2rem}
.crumbs a{color:var(--slate);text-decoration:none}
.crumbs a:hover{color:var(--patina-strong)}
.doc h1{font-size:clamp(2rem,4.6vw,3.2rem);margin:.6rem 0 0}
.doc .lede{margin-top:1.2rem}
.doc h2{font-family:"Archivo Expanded","Archivo",sans-serif;font-weight:700;letter-spacing:-.01em;font-size:clamp(1.25rem,2.4vw,1.6rem);margin:2.6rem 0 .6rem;scroll-margin-top:84px}
.doc h3{font-family:"Archivo Expanded","Archivo",sans-serif;font-weight:600;font-size:1.05rem;margin:1.6rem 0 .4rem}
.doc p{margin:.7rem 0}
.doc ul,.doc ol{padding-left:1.2rem}
.doc li{margin:.35rem 0}
.doc a{color:var(--patina-strong)}
.doc code{font-family:"IBM Plex Mono",monospace;font-size:.88em;background:var(--plate);border:1px solid var(--rule-soft);border-radius:5px;padding:.08em .35em}
.doc pre{background:var(--ink);color:var(--paper);border-radius:12px;padding:16px 18px;overflow-x:auto;font-family:"IBM Plex Mono",monospace;font-size:.84rem;line-height:1.55}
.doc pre code{background:none;border:0;padding:0;color:inherit;font-size:inherit}
.tbl{overflow-x:auto;margin:1rem 0}
.doc table{border-collapse:collapse;width:100%;font-size:.93rem}
.doc th,.doc td{text-align:left;vertical-align:top;padding:.6rem .7rem;border-bottom:1px solid var(--rule)}
.doc th{font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--slate);font-weight:500}
.note{border-left:2px solid var(--patina);padding-left:14px;color:var(--slate)}
.evidence{margin-top:2.8rem;border:1px solid var(--rule);border-radius:14px;background:var(--plate);padding:20px 22px}
.evidence h2{margin-top:0;font-size:1.05rem}
.related{display:flex;flex-wrap:wrap;gap:10px;margin-top:1.6rem}
.doc__foot{margin-top:2rem;font-size:.84rem;color:var(--slate-2)}
.more{display:inline-block;margin-top:1rem;font-family:"IBM Plex Mono",monospace;font-size:.82rem;color:var(--patina-strong);text-decoration:none;border-bottom:1px solid transparent}
.more:hover{border-color:var(--patina)}
.record .more{color:#8FBFAF}
.nav__links a[aria-current="page"]{color:var(--ink)}
@media(max-width:1060px){.nav__links{gap:16px}.nav__links a{font-size:.8rem}}
@media(max-width:900px){.nav__links a.hide-sm{display:none}}