/* ============================================================
   BRIAN OMARIBA — DIGITAL SYSTEMS
   system.css — design tokens, reset, primitives, chrome
   ============================================================ */

/* --- 1. TOKENS ------------------------------------------- */
:root{
  /* Surface */
  --ink-000:#050506;
  --ink-050:#08090a;
  --ink-100:#0d0f11;
  --ink-200:#141619;
  --ink-300:#1c1f23;

  /* Rules */
  --line:rgba(255,255,255,.075);
  --line-mid:rgba(255,255,255,.13);
  --line-hi:rgba(255,255,255,.24);

  /* Text */
  --text:#f1f2f3;
  --text-dim:#8c9197;
  --text-faint:#585e65;

  /* Signal — the ONE accent. Budget: ~2% of pixels. */
  --sig:#4df08c;
  --sig-dim:rgba(77,240,140,.55);
  --sig-ghost:rgba(77,240,140,.14);
  --sig-wash:rgba(77,240,140,.055);

  /* Type */
  --sans:"Geist","Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --mono:"Geist Mono","SFMono-Regular",ui-monospace,"Cascadia Mono","Roboto Mono",monospace;

  /* Scale is deliberately wide. Statements must dwarf section heads,
     and section heads must dwarf body — otherwise every block reads
     at the same volume and the page has no rhythm. */
  --fs-stmt:clamp(2.9rem,10.2vw,12.5rem);
  --fs-hero:clamp(2.85rem,9.2vw,10.5rem);
  --fs-d1:clamp(2rem,5.1vw,4.25rem);
  --fs-d2:clamp(1.7rem,3.6vw,2.9rem);
  --fs-d3:clamp(1.3rem,2.3vw,1.9rem);
  --fs-lead:clamp(1.02rem,1.55vw,1.32rem);
  --fs-body:clamp(.95rem,1.05vw,1.02rem);
  --fs-meta:.6875rem;
  --fs-micro:.625rem;

  --trk-meta:.145em;

  /* Space */
  --gut:clamp(20px,4vw,72px);
  --max:1560px;
  --sec-y:clamp(5.5rem,13vh,11.5rem);

  /* Motion */
  --t-fast:200ms;
  --t-mid:400ms;
  --t-slow:700ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);

  --header-h:72px;
}

/* --- 2. RESET -------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
html:focus-within{scroll-behavior:smooth}
body{
  background:var(--ink-000);
  color:var(--text);
  font-family:var(--sans);
  font-size:var(--fs-body);
  line-height:1.62;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
}
img,svg,canvas{display:block;max-width:100%}
img{height:auto}
button,input{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
h1,h2,h3,h4{font-weight:500;line-height:.95;letter-spacing:-.035em}
::selection{background:var(--sig);color:var(--ink-000)}

:focus-visible{
  outline:2px solid var(--sig);
  outline-offset:3px;
  border-radius:1px;
}

.skip{
  position:absolute;top:-100px;left:var(--gut);z-index:200;
  background:var(--sig);color:var(--ink-000);
  padding:.7rem 1.1rem;font:500 var(--fs-meta)/1 var(--mono);
  letter-spacing:var(--trk-meta);text-transform:uppercase;
  transition:top var(--t-fast) var(--ease);
}
.skip:focus{top:1rem}

/* --- 3. LAYOUT ------------------------------------------- */
.shell{
  width:100%;max-width:var(--max);margin-inline:auto;
  padding-inline:var(--gut);
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  column-gap:clamp(16px,2.2vw,32px);
}
section[id]{scroll-margin-top:calc(var(--header-h) + 8px)}
.sec{padding-block:var(--sec-y);position:relative}
.rule{height:1px;background:var(--line);width:100%;border:0}

/* --- 4. TYPE PRIMITIVES ---------------------------------- */
.meta{
  font-family:var(--mono);
  font-size:var(--fs-meta);
  letter-spacing:var(--trk-meta);
  text-transform:uppercase;
  color:var(--text-faint);
  line-height:1.4;
  font-weight:400;
}
.meta--sig{color:var(--sig)}
.meta--dim{color:var(--text-dim)}
.micro{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;text-transform:uppercase;color:var(--text-faint)}

.d1{font-size:var(--fs-d1);letter-spacing:-.035em;line-height:.92;font-weight:500}
.d2{font-size:var(--fs-d2);letter-spacing:-.03em;line-height:1;font-weight:500}
.d3{font-size:var(--fs-d3);letter-spacing:-.02em;line-height:1.14;font-weight:500}
.lead{font-size:var(--fs-lead);line-height:1.5;color:var(--text-dim);letter-spacing:-.011em;font-weight:400}
.dim{color:var(--text-dim)}
.faint{color:var(--text-faint)}
.sig{color:var(--sig)}
.mono{font-family:var(--mono)}
.hide-sm{display:none}
@media(min-width:760px){.hide-sm{display:initial}}

/* ---- EDITORIAL FRAME -------------------------------------
   Every content section is set against a margin rail carrying a
   sticky section number and label. This is the single structural
   decision that makes the page read as a publication. Statements
   break out of it on purpose. */
.ed{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(1.5rem,3vw,2.5rem)}
@media(min-width:1000px){
  .ed{
    grid-template-columns:clamp(7rem,12vw,13rem) minmax(0,1fr);
    gap:clamp(2rem,5vw,6rem);
    align-items:start;
  }
}
.ed__rail{
  display:flex;align-items:baseline;gap:1rem;
  padding-top:.9rem;border-top:1px solid var(--line-mid);
}
@media(min-width:1000px){
  .ed__rail{
    position:sticky;top:calc(var(--header-h) + 2.2rem);
    flex-direction:column;gap:.5rem;align-items:flex-start;
  }
}
.ed__n{
  color:var(--sig);font-variant-numeric:tabular-nums;
  font-family:var(--mono);font-size:var(--fs-meta);letter-spacing:var(--trk-meta);
}
.ed__t{color:var(--text-dim)}
.ed__body{min-width:0;padding-top:.9rem;border-top:1px solid var(--line-mid)}
@media(min-width:1000px){.ed__body{border-top:0;padding-top:.55rem}}

/* ---- FIXED SECTION READOUT -------------------------------
   Live position in the document. Technical, and actually useful —
   it is evidence of instrumentation, not ornament. */
.hud{
  position:fixed;left:var(--gut);bottom:1.4rem;z-index:80;
  display:none;align-items:center;gap:.7rem;
  pointer-events:none;mix-blend-mode:difference;
}
@media(min-width:1000px){.hud{display:flex}}
.hud__n{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;color:#fff}
.hud__t{
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;
  text-transform:uppercase;color:#fff;
  min-width:9ch;
}
.hud__bar{display:block;width:74px;height:1px;background:rgba(255,255,255,.28);position:relative}
.hud__bar i{
  position:absolute;left:0;top:0;height:100%;width:0;background:#fff;
  transition:width 180ms linear;
}

/* Placeholder marker — honest gaps, never invented facts */
.ph{
  font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.14em;text-transform:uppercase;
  color:#d8b24a;
  border:1px dashed rgba(216,178,74,.45);
  background:rgba(216,178,74,.06);
  padding:.32em .6em;display:inline-block;line-height:1.3;
  border-radius:2px;
}

/* --- 5. HEADER ------------------------------------------- */
.hdr{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(5,5,6,0);
  border-bottom:1px solid transparent;
  transition:background var(--t-mid) var(--ease),border-color var(--t-mid) var(--ease);
}
.hdr.is-stuck{
  background:rgba(5,5,6,.82);
  backdrop-filter:blur(14px) saturate(1.2);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  border-bottom-color:var(--line);
}
.hdr__in{
  width:100%;max-width:var(--max);margin-inline:auto;
  padding-inline:var(--gut);
  display:flex;align-items:center;gap:2rem;
}

/* Logo lockup: cropped monogram + wordmark */
.lock{display:flex;align-items:center;gap:.68rem;flex-shrink:0}
/* The supplied mark is white ink on an OPAQUE black plate.
   `screen` drops the plate against the dark page; the box crops
   the lockup down to the crown + B monogram (measured from source). */
.lock__mark{width:30px;height:34px;overflow:hidden;position:relative;flex-shrink:0}
.lock__mark img{
  position:absolute;width:65px;max-width:none;
  left:-11px;top:-9px;opacity:.94;
  mix-blend-mode:screen;
  transition:opacity var(--t-fast) var(--ease);
}
.lock__word{
  font-size:.82rem;font-weight:500;letter-spacing:.055em;
  text-transform:uppercase;white-space:nowrap;
}
.lock:hover .lock__mark img{opacity:1}

.nav{display:none;margin-left:auto;align-items:center;gap:clamp(1.1rem,2.2vw,2.1rem)}
@media(min-width:1024px){.nav{display:flex}}
.nav a{
  font-family:var(--mono);font-size:var(--fs-meta);
  letter-spacing:var(--trk-meta);text-transform:uppercase;
  color:var(--text-dim);position:relative;padding-block:.4rem;
  transition:color var(--t-fast) var(--ease);
}
.nav a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--sig);transition:width var(--t-mid) var(--ease-out);
}
.nav a:hover,.nav a.is-active{color:var(--text)}
.nav a:hover::after,.nav a.is-active::after{width:100%}

.hdr__right{margin-left:auto;display:flex;align-items:center;gap:1rem}
@media(min-width:1024px){.hdr__right{margin-left:0}}
/* Specificity note: .btn also sets display, so this must out-rank it. */
.btn.hdr__cta{display:none}
@media(min-width:1024px){.btn.hdr__cta{display:inline-flex}}

/* Status dot — opens the command interface */
.statusbtn{
  display:flex;align-items:center;gap:.5rem;
  font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.16em;text-transform:uppercase;color:var(--text-faint);
  border:1px solid var(--line-mid);padding:.45rem .7rem;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.statusbtn:hover{border-color:var(--sig-dim);color:var(--text-dim)}
.statusbtn__k{display:none}
@media(min-width:640px){.statusbtn__k{display:inline}}
.dot{
  width:5px;height:5px;border-radius:50%;background:var(--sig);
  animation:pulse 2.6s var(--ease) infinite;flex-shrink:0;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(77,240,140,.34)}
  60%{box-shadow:0 0 0 6px rgba(77,240,140,0)}
}

/* Burger */
.burger{
  display:flex;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;align-items:flex-end;
}
@media(min-width:1024px){.burger{display:none}}
.burger span{
  display:block;height:1px;background:var(--text);
  transition:transform var(--t-mid) var(--ease),width var(--t-mid) var(--ease);
}
.burger span:nth-child(1){width:22px}
.burger span:nth-child(2){width:14px}
body.nav-open .burger span:nth-child(1){transform:translateY(3px) rotate(45deg)}
body.nav-open .burger span:nth-child(2){width:22px;transform:translateY(-3px) rotate(-45deg)}

/* --- 6. FULLSCREEN MOBILE NAV ---------------------------- */
.fsnav{
  position:fixed;inset:0;z-index:99;
  background:var(--ink-000);
  display:flex;flex-direction:column;
  padding:calc(var(--header-h) + 2rem) var(--gut) 2rem;
  opacity:0;visibility:hidden;
  transform:translateY(-8px);
  transition:opacity var(--t-mid) var(--ease),transform var(--t-mid) var(--ease),visibility var(--t-mid);
  overflow-y:auto;
}
body.nav-open .fsnav{opacity:1;visibility:visible;transform:none}
.fsnav__list{margin-top:auto;margin-bottom:auto}
.fsnav__item{border-top:1px solid var(--line)}
.fsnav__item:last-child{border-bottom:1px solid var(--line)}
.fsnav__link{
  display:flex;align-items:baseline;gap:1rem;
  padding:clamp(.85rem,2.4vh,1.35rem) 0;
  font-size:clamp(1.9rem,9vw,3rem);font-weight:500;letter-spacing:-.035em;
  line-height:1;
  opacity:0;transform:translateY(14px);
}
body.nav-open .fsnav__link{
  opacity:1;transform:none;
  transition:opacity var(--t-slow) var(--ease-out) var(--d,0ms),transform var(--t-slow) var(--ease-out) var(--d,0ms);
}
.fsnav__n{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;color:var(--sig);flex-shrink:0}
.fsnav__foot{display:flex;flex-wrap:wrap;gap:.6rem 1.4rem;padding-top:1.6rem}

/* --- 7. BUTTONS ------------------------------------------ */
.btn{
  position:relative;display:inline-flex;align-items:center;gap:.7rem;
  font-family:var(--mono);font-size:var(--fs-meta);
  letter-spacing:var(--trk-meta);text-transform:uppercase;
  padding:1.02rem 1.55rem;border:1px solid var(--line-hi);
  color:var(--text);overflow:hidden;
  transition:border-color var(--t-mid) var(--ease);
}
.btn__l{position:relative;z-index:1;transition:color var(--t-mid) var(--ease)}
.btn::before{
  content:"";position:absolute;inset:0;background:var(--sig);
  transform:scaleX(0);transform-origin:left;
  transition:transform var(--t-mid) var(--ease-out);
}
.btn:hover{border-color:var(--sig)}
.btn:hover::before{transform:scaleX(1)}
.btn:hover .btn__l{color:var(--ink-000)}
.btn--sig{border-color:var(--sig);color:var(--sig)}
.btn--ghost{border-color:var(--line-mid);color:var(--text-dim)}
.btn--sm{padding:.72rem 1.1rem}
.btn--lg{padding:1.25rem 2rem;font-size:.75rem}

/* Inline arrow link */
.alink{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--mono);font-size:var(--fs-meta);
  letter-spacing:var(--trk-meta);text-transform:uppercase;
  color:var(--text-dim);
  transition:color var(--t-fast) var(--ease),gap var(--t-mid) var(--ease-out);
}
.alink:hover{color:var(--sig);gap:.95rem}

/* --- 8. COMMAND INTERFACE -------------------------------- */
.cmd{
  position:fixed;inset:0;z-index:150;
  display:grid;place-items:start center;
  padding:clamp(4rem,14vh,9rem) var(--gut) 2rem;
  background:rgba(4,4,5,.72);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  opacity:0;visibility:hidden;
  transition:opacity var(--t-mid) var(--ease),visibility var(--t-mid);
}
.cmd[data-open="true"]{opacity:1;visibility:visible}
.cmd__panel{
  width:100%;max-width:580px;
  background:var(--ink-100);
  border:1px solid var(--line-mid);
  box-shadow:0 30px 90px -20px rgba(0,0,0,.85);
  transform:translateY(-10px) scale(.99);
  transition:transform var(--t-mid) var(--ease-out);
}
.cmd[data-open="true"] .cmd__panel{transform:none}
.cmd__bar{display:flex;align-items:center;gap:.7rem;padding:.95rem 1.1rem;border-bottom:1px solid var(--line)}
.cmd__chev{color:var(--sig);font-family:var(--mono);font-size:.8rem;line-height:1}
.cmd__input{
  flex:1;font-family:var(--mono);font-size:.82rem;letter-spacing:.02em;
  color:var(--text);caret-color:var(--sig);min-width:0;
}
.cmd__input::placeholder{color:var(--text-faint)}
.cmd__list{max-height:min(46vh,380px);overflow-y:auto;padding:.4rem}
.cmd__item{
  display:flex;align-items:center;gap:.9rem;width:100%;text-align:left;
  padding:.72rem .8rem;color:var(--text-dim);
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.cmd__item[aria-selected="true"]{background:var(--sig-wash);color:var(--text)}
.cmd__item[aria-selected="true"] .cmd__cue{color:var(--sig)}
.cmd__cue{font-family:var(--mono);font-size:var(--fs-micro);color:var(--text-faint);width:1.1rem;flex-shrink:0}
.cmd__name{font-family:var(--mono);font-size:.78rem;letter-spacing:.04em}
.cmd__desc{margin-left:auto;font-size:var(--fs-micro);font-family:var(--mono);color:var(--text-faint);letter-spacing:.1em;text-transform:uppercase}
.cmd__empty{padding:1.4rem .9rem;text-align:center}
.cmd__foot{display:flex;gap:1.2rem;padding:.7rem 1.1rem;border-top:1px solid var(--line);flex-wrap:wrap}
kbd{
  font-family:var(--mono);font-size:var(--fs-micro);
  border:1px solid var(--line-mid);padding:.12em .38em;color:var(--text-faint);
  border-radius:2px;
}

/* --- 9. FOOTER ------------------------------------------- */
.ftr{border-top:1px solid var(--line);padding-block:clamp(3rem,7vw,5.5rem) 2.5rem}
.ftr__top{display:grid;gap:clamp(2.5rem,5vw,4rem);grid-template-columns:1fr}
@media(min-width:860px){.ftr__top{grid-template-columns:1.4fr 1fr 1fr}}
/* Footer shows the full signature at a size where the script reads. */
.ftr__mark{width:150px;height:123px;overflow:hidden;position:relative;margin-bottom:1.4rem}
.ftr__mark img{position:absolute;width:236px;max-width:none;left:-40px;top:-32px;opacity:.92;mix-blend-mode:screen}
.ftr__col h3{margin-bottom:1.1rem}
.ftr__col li{margin-bottom:.55rem}
.ftr__col a{color:var(--text-dim);transition:color var(--t-fast) var(--ease)}
.ftr__col a:hover{color:var(--sig)}
.ftr__bot{
  display:flex;flex-wrap:wrap;gap:1rem 2rem;align-items:center;
  margin-top:clamp(2.5rem,6vw,4.5rem);padding-top:1.5rem;border-top:1px solid var(--line);
}
.ftr__disc{display:flex;flex-wrap:wrap;gap:.5rem 1.15rem}
.ftr__disc span{position:relative}
.ftr__disc span+span::before{content:"";position:absolute;left:-.62rem;top:50%;width:3px;height:1px;background:var(--line-hi)}

/* --- 10. REVEAL + MOTION --------------------------------- */
.js [data-rv]{opacity:0;transform:translateY(20px)}
.js [data-rv].is-in{
  opacity:1;transform:none;
  transition:opacity var(--t-slow) var(--ease-out) var(--d,0ms),transform var(--t-slow) var(--ease-out) var(--d,0ms);
}
.js [data-rv="fade"]{transform:none}
.js [data-rv="line"]{opacity:1;transform:scaleX(0);transform-origin:left}
.js [data-rv="line"].is-in{transform:scaleX(1);transition:transform var(--t-slow) var(--ease-out) var(--d,0ms)}

@media(prefers-reduced-motion:reduce){
  html:focus-within{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important;
  }
  [data-rv]{opacity:1!important;transform:none!important}
  [data-rv="line"]{transform:scaleX(1)!important}
  .dot{animation:none}
}