/* ══════════════════════════════════════════════════════════
   TECXIA — visual system
   Black / dark grey / off-white + one accent. Precision instrument,
   not a corporate template. All motion is additive: nothing here
   is hidden without a documented way to reveal it.
   ══════════════════════════════════════════════════════════ */

/* ── 1. TOKENS ─────────────────────────────────────────── */
:root{
  /* surfaces */
  --bg:#08080A;
  --s1:#0D0D10;
  --s2:#131317;
  --s3:#1A1A1F;
  /* ink (米白) */
  --ink:#EDEBE7;
  --ink-2:#B9B7B2;
  --ink-3:#8A8A90;
  --ink-4:#5C5C63;
  /* structure */
  --hair:rgba(237,235,231,.11);
  --hair-2:rgba(237,235,231,.055);
  --hair-3:rgba(237,235,231,.025);
  /* single accent */
  --accent:#FF6B2C;
  --accent-lift:#FF8A4C;   /* display-size tint of the one accent */
  --accent-dim:rgba(255,107,44,.42);
  --accent-faint:rgba(255,107,44,.12);

  /* type */
  --sans:"IBM Plex Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --fs-micro:12px;   /* never smaller — legibility floor on any device */
  --fs-mono:13px;
  --fs-body:clamp(15px,1.05vw,17px);
  --fs-lede:clamp(17px,1.55vw,23px);
  --fs-h1:clamp(30px,5.4vw,74px);
  --fs-disp:clamp(40px,8.6vw,124px);
  --lh-tight:.96;
  --tr-tight:-.028em;

  /* rhythm */
  --gut:clamp(20px,4.6vw,64px);
  --maxw:1420px;
  --sp-sec:clamp(96px,17vh,220px);
  --t-fast:.22s;
  --t-mid:.5s;
  --t-slow:1.1s;
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
}

/* ── 2. RESET ──────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:var(--fs-body);line-height:1.62;
  font-weight:400;letter-spacing:-.005em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,p,dl,dd,dt,ol,ul,li,figure{margin:0;padding:0}
ol,ul{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
canvas{display:block}
img,svg{display:block;max-width:100%}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
::selection{background:var(--accent);color:#0A0A0C}
:focus-visible{outline:1px solid var(--accent);outline-offset:3px}

/* ── 3. FONT FACES (self-hosted) ───────────────────────── */
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:300;font-display:swap;
  src:url("../fonts/plex-sans-300.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:400;font-display:swap;
  src:url("../fonts/plex-sans-400.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:500;font-display:swap;
  src:url("../fonts/plex-sans-500.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:600;font-display:swap;
  src:url("../fonts/plex-sans-600.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;
  src:url("../fonts/plex-mono-400.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;
  src:url("../fonts/plex-mono-500.woff2") format("woff2")}

/* ── 4. FIELD LAYERS ───────────────────────────────────── */
#field{
  position:fixed;inset:0;width:100%;height:100%;z-index:0;
  background:
    radial-gradient(120% 88% at 50% 42%,#101015 0%,#0A0A0D 46%,var(--bg) 100%);
}
/* grade: vignette + horizon wash, purely optical */
#field-grade{
  position:fixed;inset:0;z-index:1;pointer-events:none;
  background:
    radial-gradient(90% 62% at 50% 46%,transparent 42%,rgba(4,4,6,.55) 100%),
    linear-gradient(to bottom,rgba(8,8,10,.72) 0%,transparent 22%,transparent 74%,rgba(8,8,10,.86) 100%);
}
/* grain: fixed, over-sized, clipped by its own inset so it cannot inflate scrollWidth */
#field-grain{
  position:fixed;top:0;left:0;width:100%;height:100%;z-index:2;pointer-events:none;
  opacity:.05;mix-blend-mode:screen;overflow:hidden;
}
#field-grain::after{
  content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 6s steps(6) infinite;
}
@keyframes grain{
  0%{transform:translate3d(0,0,0)}     20%{transform:translate3d(-6%,3%,0)}
  40%{transform:translate3d(4%,-4%,0)} 60%{transform:translate3d(-3%,-2%,0)}
  80%{transform:translate3d(5%,2%,0)}  100%{transform:translate3d(0,0,0)}
}

/* ── 5. DOC RHYTHM ─────────────────────────────────────── */
#doc{position:relative;z-index:3}
/* a soft scrim so small mono text never fights the moving field —
   a gradient, not a glass panel */
section::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:-1;
  background:radial-gradient(86% 74% at 16% 44%,rgba(8,8,10,.90) 0%,rgba(8,8,10,.66) 44%,rgba(8,8,10,0) 100%);
}
#next::before,#signal::before{background:radial-gradient(96% 80% at 30% 44%,rgba(8,8,10,.92) 0%,rgba(8,8,10,.7) 50%,rgba(8,8,10,.35) 100%)}
section{
  position:relative;
  padding:var(--sp-sec) 0 calc(var(--sp-sec) * .72);
}
.wrap{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--gut);
}
#system{padding-top:clamp(140px,26vh,300px)}
#next{padding-bottom:clamp(80px,14vh,180px)}

/* eyebrow / section number */
.eyebrow{
  display:flex;align-items:baseline;gap:.85em;
  font-family:var(--mono);font-size:var(--fs-micro);font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--ink-3);
  margin-bottom:clamp(22px,3.4vh,40px);
  padding-bottom:14px;border-bottom:1px solid var(--hair);
}
.eb-n{color:var(--accent)}
.eb-t{color:var(--ink-2)}

/* display + headings, line-mask reveal */
.h-display,.h-1{font-weight:500;letter-spacing:var(--tr-tight);line-height:var(--lh-tight)}
.h-display{font-size:var(--fs-disp)}
.h-1{font-size:var(--fs-h1);line-height:1.02}
.ln{display:block;overflow:hidden}
.ln .inner{display:block}
html.js .rv .ln .inner{transform:translateY(104%);opacity:0;
  transition:transform 1.05s var(--ease-out),opacity .8s var(--ease-out)}
html.js .rv.on .ln .inner{transform:none;opacity:1}
html.js .rv .ln:nth-child(2) .inner{transition-delay:.09s}
html.js .rv .ln:nth-child(3) .inner{transition-delay:.18s}

.lede{
  font-size:var(--fs-lede);line-height:1.5;font-weight:300;
  color:var(--ink-2);max-width:46ch;
  margin-top:clamp(22px,3.6vh,40px);
}
.note{
  display:flex;gap:1.1em;align-items:baseline;
  margin-top:clamp(34px,5vh,60px);padding-top:16px;
  border-top:1px solid var(--hair-2);
  font-size:var(--fs-body);color:var(--ink-3);max-width:74ch;line-height:1.55;
}
.n-k{
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.2em;
  color:var(--accent);flex:none;padding-top:.25em;
}
.hint{
  margin-top:18px;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.18em;color:var(--ink-4);
}

/* generic reveal (default VISIBLE; only hidden once JS marks the doc) */
html.js .rv-fx{opacity:0;transform:translateY(22px);
  transition:opacity .9s var(--ease-out),transform .9s var(--ease-out)}
html.js .rv-fx.on{opacity:1;transform:none}

/* ══ BOOT ══ */
#boot{
  position:fixed;inset:0;z-index:100;background:var(--bg);
  display:flex;align-items:center;justify-content:center;
  padding:var(--gut);
}
html.no-js #boot{display:none}
body.is-booting{overflow:hidden;height:100vh}
#boot.done{opacity:0;pointer-events:none;transition:opacity .62s var(--ease),visibility 0s .62s;visibility:hidden}
.boot-inner{width:100%;max-width:520px;text-align:left}
.boot-mark{display:flex;gap:5px;margin-bottom:22px}
.bm-bar{width:22px;height:3px;background:var(--ink-4);display:block;
  transform-origin:0 50%;transform:scaleX(0);
  transition:transform .34s var(--ease-out),background .34s}
.bm-bar:nth-child(1){transition-delay:.05s}
.bm-bar:nth-child(2){transition-delay:.13s}
.bm-bar:nth-child(3){transition-delay:.21s}
#boot.st-1 .bm-bar{transform:scaleX(1)}
#boot.st-1 .bm-bar:nth-child(3){background:var(--accent)}
.boot-word{
  font-size:clamp(34px,7vw,62px);font-weight:500;letter-spacing:-.03em;
  line-height:1;margin-bottom:26px;
  opacity:0;transform:translateY(10px);
  transition:opacity .5s var(--ease-out),transform .5s var(--ease-out);
}
#boot.st-1 .boot-word{opacity:1;transform:none}
.boot-log{font-family:var(--mono);font-size:var(--fs-mono);letter-spacing:.06em}
.boot-log > div{
  display:flex;justify-content:space-between;gap:1em;
  padding:7px 0;border-bottom:1px solid var(--hair-3);
  opacity:0;transform:translateY(6px);
  transition:opacity .34s var(--ease-out),transform .34s var(--ease-out);
}
.boot-log > div.on{opacity:1;transform:none}
.bl-k{color:var(--ink-4)}
.bl-v{color:var(--ink-2)}
.bl-ok{color:var(--accent)}
.boot-meter{height:1px;background:var(--hair);margin-top:4px;overflow:hidden}
.boot-meter i{display:block;height:100%;width:0;background:var(--accent);
  transition:width 1.15s linear}
#boot-skip{
  margin-top:26px;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.2em;color:var(--ink-4);padding:8px 0;
  border-bottom:1px solid transparent;transition:color var(--t-fast),border-color var(--t-fast);
}
#boot-skip:hover,#boot-skip:focus-visible{color:var(--ink);border-color:var(--hair)}

/* ══ HUD ══ */
#hud{
  position:fixed;top:0;left:0;right:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:1.4em;
  padding:max(14px,env(safe-area-inset-top)) var(--gut) 14px;
  pointer-events:none;
  opacity:0;transform:translateY(-8px);
  transition:opacity .7s var(--ease-out),transform .7s var(--ease-out);
}
body.sys-on #hud{opacity:1;transform:none}
#hud > *{pointer-events:auto}
#hud::after{
  content:"";position:absolute;left:var(--gut);right:var(--gut);bottom:0;height:1px;
  background:linear-gradient(to right,transparent,var(--hair),transparent);
}
#hud-mark{display:flex;align-items:center;gap:11px;color:var(--ink)}
#hud-mark svg{width:42px;height:16px;flex:none}
#hud-mark svg rect{fill:var(--accent)}
.hud-name{font-family:var(--mono);font-size:var(--fs-mono);font-weight:500;letter-spacing:.34em}
#hud-state{
  display:flex;align-items:baseline;gap:.6em;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;color:var(--ink-3);
}
.hs-k{color:var(--ink-4)}
.hs-v{color:var(--ink-2)}
.hs-sep{color:var(--ink-4)}
#hs-dim{color:var(--accent)}
#hud-index-btn{
  display:flex;align-items:center;gap:9px;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.2em;color:var(--ink-3);
  padding:7px 11px;border:1px solid var(--hair-2);border-radius:2px;
  transition:color var(--t-fast),border-color var(--t-fast),background var(--t-fast);
}
#hud-index-btn:hover,#hud-index-btn:focus-visible{color:var(--ink);border-color:var(--hair)}
#hud-index-btn[aria-expanded="true"]{color:var(--ink);border-color:var(--accent-dim);background:var(--accent-faint)}
.hib-bars{display:flex;flex-direction:column;gap:2.5px;width:11px}
.hib-bars i{height:1px;background:currentColor;display:block;transition:transform var(--t-fast)}
#hud-index-btn[aria-expanded="true"] .hib-bars i:nth-child(2){transform:scaleX(.55)}

#hud-index{
  position:fixed;z-index:41;top:calc(env(safe-area-inset-top) + 62px);right:var(--gut);
  width:min(340px,calc(100vw - var(--gut) * 2));
  background:rgba(13,13,16,.94);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border:1px solid var(--hair);border-radius:3px;padding:6px;
}
#hud-index[hidden]{display:none}
#hud-index ol{display:flex;flex-direction:column}
#hud-index a{
  display:grid;grid-template-columns:auto 1fr;gap:.2em .9em;
  padding:11px 12px;border-radius:2px;
  transition:background var(--t-fast);
}
#hud-index a:hover,#hud-index a:focus-visible{background:rgba(237,235,231,.045)}
.hi-n{font-family:var(--mono);font-size:var(--fs-micro);color:var(--accent);letter-spacing:.1em;
  grid-row:span 2;align-self:start;padding-top:.15em}
.hi-t{font-family:var(--mono);font-size:var(--fs-mono);letter-spacing:.18em;color:var(--ink)}
.hi-d{font-size:12.5px;color:var(--ink-3);line-height:1.4}

/* fixed scrims: HUD and rail must never sit directly on scrolling content */
#scrim-top,#scrim-bot{position:fixed;left:0;right:0;z-index:39;pointer-events:none}
#scrim-top{top:0;height:calc(max(58px,env(safe-area-inset-top) + 46px));
  background:linear-gradient(to bottom,var(--bg) 0%,rgba(8,8,10,.86) 40%,rgba(8,8,10,0) 100%)}
#scrim-bot{bottom:0;height:calc(max(76px,env(safe-area-inset-bottom) + 66px));
  background:linear-gradient(to top,var(--bg) 0%,rgba(8,8,10,.84) 38%,rgba(8,8,10,0) 100%)}

#hud-coords{
  position:fixed;z-index:40;right:var(--gut);left:auto;
  top:calc(max(14px,env(safe-area-inset-top)) + 54px);bottom:auto;
  align-items:flex-end;text-align:right;
  display:flex;flex-direction:column;gap:3px;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.1em;color:var(--ink-4);
  pointer-events:none;opacity:0;transition:opacity .7s var(--ease-out) .2s;
}
body.sys-on #hud-coords{opacity:1}

#hud-rail{
  position:fixed;z-index:40;right:var(--gut);
  bottom:max(16px,env(safe-area-inset-bottom));
  display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.14em;color:var(--ink-4);
  pointer-events:none;opacity:0;transition:opacity .7s var(--ease-out) .2s;
}
body.sys-on #hud-rail{opacity:1}
.rail-track{width:clamp(70px,14vw,180px);height:1px;background:var(--hair);position:relative}
.rail-track i{position:absolute;inset:0 auto 0 0;width:0;background:var(--accent)}
.rail-marks{display:flex;gap:.9em}
.rail-marks span{transition:color var(--t-mid)}
.rail-marks span.on{color:var(--ink)}
.rail-pct{color:var(--ink-3);min-width:6.4em;text-align:right;white-space:nowrap}
.rail-k{color:var(--ink-4);margin-right:.5em}

#snd{
  position:fixed;z-index:40;right:var(--gut);
  bottom:calc(max(16px,env(safe-area-inset-bottom)) + 40px);
  display:flex;align-items:center;gap:9px;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;color:var(--ink-4);
  padding:6px 10px;border:1px solid var(--hair-2);border-radius:2px;
  opacity:0;transition:opacity .7s var(--ease-out) .3s,color var(--t-fast),border-color var(--t-fast);
}
body.sys-on #snd{opacity:1}
#snd:hover,#snd:focus-visible{color:var(--ink);border-color:var(--hair)}
#snd[aria-pressed="true"]{color:var(--accent);border-color:var(--accent-dim)}
.snd-bars{display:flex;align-items:flex-end;gap:2px;height:11px}
.snd-bars i{width:2px;height:3px;background:currentColor;display:block}
#snd[aria-pressed="true"] .snd-bars i{animation:eq 1.1s var(--ease) infinite alternate}
.snd-bars i:nth-child(2){animation-delay:.15s}
.snd-bars i:nth-child(3){animation-delay:.3s}
.snd-bars i:nth-child(4){animation-delay:.45s}
@keyframes eq{from{height:2px}to{height:11px}}

/* ══ 01 SYSTEM / TRIAD ══ */
.triad{
  margin-top:clamp(46px,7.5vh,92px);
  display:grid;gap:0;
  grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--hair);
}
.tri{
  position:relative;padding:clamp(24px,3vw,40px) clamp(18px,2.2vw,34px) clamp(26px,3.4vw,44px);
  border-bottom:1px solid var(--hair);
  border-right:1px solid var(--hair);
  transition:background var(--t-mid) var(--ease);
  cursor:default;
}
.tri:last-child{border-right:0}
.tri::before{
  content:"";position:absolute;left:0;top:-1px;width:0;height:1px;
  background:var(--accent);transition:width .75s var(--ease-out);
}
.tri.on::before{width:100%}
.tri:hover,.tri:focus-visible{background:rgba(237,235,231,.018)}
.tri-i{
  display:block;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.2em;color:var(--ink-4);margin-bottom:clamp(30px,5vh,64px);
  transition:color var(--t-mid);
}
.tri.on .tri-i{color:var(--accent)}
.tri-h{font-size:clamp(19px,1.7vw,26px);font-weight:500;letter-spacing:-.01em}
.tri-s{
  margin-top:8px;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.05em;color:var(--ink-3);line-height:1.6;
}
.tri-b{margin-top:clamp(14px,2vh,22px);font-size:var(--fs-body);color:var(--ink-2);
  line-height:1.55;font-weight:300;max-width:34ch}
.tri-sig{
  position:absolute;right:clamp(18px,2.2vw,34px);top:clamp(24px,3vw,40px);
  width:26px;height:10px;opacity:.35;
  background:
    linear-gradient(to right,transparent 0 2px,var(--ink-4) 2px 3px,transparent 3px 6px,
      var(--ink-4) 6px 7px,transparent 7px 10px,var(--ink-4) 10px 11px,transparent 11px 14px,
      var(--ink-4) 14px 15px,transparent 15px 18px,var(--ink-4) 18px 19px,transparent 19px 22px,
      var(--ink-4) 22px 23px,transparent 23px 26px);
  transition:opacity var(--t-mid),background .4s;
}
.tri.on .tri-sig{
  opacity:1;
  background:linear-gradient(to right,var(--accent) 0 3px,transparent 3px 5px,
    var(--accent) 5px 9px,transparent 9px 12px,var(--accent) 12px 15px,transparent 15px 17px,
    var(--accent) 17px 21px,transparent 21px 23px,var(--accent) 23px 26px);
}

/* ══ 02 EXPLORATION / DIMENSIONS ══ */
.dims{
  margin-top:clamp(44px,7vh,86px);
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--hair-2);border:1px solid var(--hair-2);border-radius:2px;
}
.dim{
  position:relative;text-align:left;
  padding:clamp(18px,2.3vw,28px) clamp(15px,1.8vw,24px) clamp(22px,2.6vw,32px);
  background:var(--bg);
  transition:background var(--t-mid) var(--ease);
}
.dim:hover{background:var(--s1)}
.dim.is-on{background:var(--s1)}
.dm-k{display:block;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.18em;color:var(--ink-4);margin-bottom:clamp(22px,3.6vh,44px)}
.dm-t{display:block;font-size:clamp(15px,1.35vw,20px);font-weight:500;letter-spacing:-.005em;
  transition:color var(--t-mid)}
.dim.is-on .dm-t{color:var(--accent)}
.dm-b{display:block;margin-top:16px;height:2px;background:rgba(237,235,231,.22);position:relative;overflow:hidden}
.dm-b i{position:absolute;inset:0 auto 0 0;width:0;background:var(--ink-3);
  transition:width .6s var(--ease-out),background .5s}
.dim.is-on .dm-b i{background:var(--accent)}

.readout{
  margin-top:clamp(34px,5vh,58px);
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--hair);
}
.readout > div{
  padding:16px 0 0;border-right:1px solid var(--hair-2);
  padding-right:12px;
}
.readout > div:last-child{border-right:0}
.readout dt{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;color:var(--ink-4)}
.readout dd{margin-top:7px;font-family:var(--mono);font-size:clamp(14px,1.35vw,19px);
  color:var(--ink);letter-spacing:.02em}

/* ══ 03 EXPERIMENTS ══ */
.nodes{
  margin-top:clamp(40px,6.4vh,78px);
  border-top:1px solid var(--hair);
}
.node{
  position:relative;
  display:grid;grid-template-columns:auto minmax(0,1.5fr) minmax(0,1fr) auto;
  gap:clamp(14px,2vw,30px);align-items:center;
  padding:clamp(20px,2.6vw,30px) 0;
  border-bottom:1px solid var(--hair);
  width:100%;text-align:left;
  transition:padding-left var(--t-mid) var(--ease),background var(--t-mid);
}
.node::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:1px;
  background:var(--accent);transform:scaleY(0);transform-origin:50% 0;
  transition:transform .6s var(--ease-out);
}
.node:hover,.node:focus-visible{background:rgba(237,235,231,.016);padding-left:clamp(12px,1.6vw,22px)}
.node:hover::before,.node:focus-visible::before{transform:scaleY(1)}
.nd-ref{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.14em;color:var(--ink-4)}
.node:hover .nd-ref{color:var(--accent)}
.nd-main{min-width:0}
.nd-nm{font-size:clamp(17px,1.75vw,26px);font-weight:500;letter-spacing:-.015em;
  display:block;line-height:1.18}
.nd-kw{
  margin-top:9px;display:flex;flex-wrap:wrap;gap:.6em;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.08em;color:var(--ink-3);
}
.nd-kw li{position:relative;padding-right:.6em}
.nd-kw li:not(:last-child)::after{content:"·";position:absolute;right:0;color:var(--ink-4)}
.nd-st{display:flex;align-items:center;gap:.7em;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.16em;color:var(--ink-2);justify-self:start}
.nd-st i{width:6px;height:6px;border-radius:50%;background:var(--ink-4);flex:none}
.nd-st[data-s="active"] i{background:var(--accent)}
.nd-st[data-s="prototype"] i{background:var(--ink-2)}
.nd-st[data-s="open"] i{background:var(--ink-4);box-shadow:0 0 0 3px rgba(237,235,231,.06)}
.nd-cy{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.14em;color:var(--ink-4);
  justify-self:end;white-space:nowrap}
.nd-go{width:16px;height:16px;flex:none;opacity:.3;transition:opacity var(--t-mid),transform var(--t-mid)}
.node:hover .nd-go{opacity:1;transform:translateX(3px)}

/* node detail */
#nd{position:fixed;inset:0;z-index:80;background:rgba(6,6,8,.9);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  display:flex;align-items:center;justify-content:center;padding:var(--gut);
  opacity:0;transition:opacity .42s var(--ease)}
#nd[hidden]{display:none}
#nd.on{opacity:1}
.nd-shell{
  position:relative;width:min(1040px,100%);max-height:calc(100dvh - var(--gut) * 2);
  overflow:auto;overscroll-behavior:contain;
  background:var(--s1);border:1px solid var(--hair);border-radius:3px;
  padding:clamp(26px,4.4vw,60px);
  transform:translateY(14px);transition:transform .5s var(--ease-out);
}
#nd.on .nd-shell{transform:none}
#nd-close{
  position:absolute;top:clamp(14px,2vw,22px);right:clamp(14px,2vw,22px);
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.2em;color:var(--ink-3);
  display:flex;gap:.6em;padding:6px 9px;border:1px solid var(--hair-2);border-radius:2px;
  transition:color var(--t-fast),border-color var(--t-fast)}
#nd-close:hover,#nd-close:focus-visible{color:var(--ink);border-color:var(--hair)}
.nd-id{display:flex;align-items:center;gap:.8em;font-family:var(--mono);font-size:var(--fs-micro);
  letter-spacing:.2em;color:var(--ink-3);margin-bottom:clamp(20px,3vh,34px)}
.nd-dot{width:3px;height:3px;border-radius:50%;background:var(--ink-4);display:block}
.nd-title{font-size:clamp(26px,4.2vw,52px);font-weight:500;letter-spacing:-.025em;line-height:1.04}
.nd-line{margin-top:18px;font-size:var(--fs-lede);line-height:1.5;font-weight:300;color:var(--ink-2);max-width:52ch}
.nd-grid{margin-top:clamp(30px,5vh,54px);display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(18px,2.6vw,36px);
  border-top:1px solid var(--hair);padding-top:clamp(20px,3vh,30px)}
.nd-col h3{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;color:var(--ink-4);
  font-weight:400;margin-bottom:14px}
.nd-col p,.nd-col li{font-size:var(--fs-body);color:var(--ink-2);line-height:1.55;font-weight:300}
.nd-col ul{display:flex;flex-direction:column;gap:7px}
.nd-col li{font-family:var(--mono);font-size:var(--fs-mono);letter-spacing:.04em}
#nd-map{width:100%;height:180px;margin-top:clamp(26px,4vh,42px);border:1px solid var(--hair-2);border-radius:2px}

/* ══ 04 ARCHIVE ══ */
.arc{margin-top:clamp(40px,6.4vh,78px);position:relative}
.arc-rail{position:relative;height:1px;background:var(--hair);margin-bottom:26px}
.arc-rail i{position:absolute;inset:0 auto 0 0;width:0;background:var(--accent);
  transition:width 1.6s var(--ease-out)}
.arc-tick{position:absolute;top:-3px;left:0;width:1px;height:7px;background:var(--accent);
  transition:left 1.6s var(--ease-out)}
.arc-table{width:100%;border-collapse:collapse}
.arc-table th{
  text-align:left;font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;
  color:var(--ink-4);font-weight:400;padding:0 14px 13px 0;
  border-bottom:1px solid var(--hair);
}
.arc-table td{
  padding:15px 14px 15px 0;border-bottom:1px solid var(--hair-2);
  font-size:var(--fs-body);color:var(--ink-2);vertical-align:baseline;
}
.arc-table tr:last-child td{border-bottom:0}
.arc-table .c-ref{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.12em;color:var(--ink-4);
  white-space:nowrap}
.arc-table .c-node{color:var(--ink);font-weight:400}
.arc-table .c-type,.arc-table .c-cy,.arc-table .c-co{font-family:var(--mono);font-size:var(--fs-mono);
  letter-spacing:.06em;color:var(--ink-3);white-space:nowrap}
.arc-table tr:hover td{background:rgba(237,235,231,.014)}

/* ══ 05 SIGNAL ══ */
.sig{margin-top:clamp(38px,6vh,72px);display:grid;grid-template-columns:repeat(3,1fr);
  gap:1px;background:var(--hair-2);border:1px solid var(--hair-2)}
.sig-col{background:var(--bg);padding:clamp(20px,2.6vw,32px)}
.sig-h{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.2em;color:var(--ink-4);
  font-weight:400;padding-bottom:15px;border-bottom:1px solid var(--hair);margin-bottom:6px}
.sig-list > div{display:flex;justify-content:space-between;gap:1em;padding:11px 0;
  border-bottom:1px solid var(--hair-3)}
.sig-list dt{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.14em;color:var(--ink-4)}
.sig-list dd{font-family:var(--mono);font-size:var(--fs-mono);color:var(--ink);text-align:right;
  letter-spacing:.02em}
.sig-wave{margin-top:26px;height:72px;border:1px solid var(--hair-2);border-radius:2px;overflow:hidden}
#wave{width:100%;height:100%}

/* ══ 06 NEXT ══ */
#next-line{margin-bottom:clamp(46px,9vh,120px)}
.end{
  border-top:1px solid var(--hair);padding-top:clamp(30px,5vh,56px);
  opacity:0;transform:translateY(16px);
  transition:opacity 1.2s var(--ease-out),transform 1.2s var(--ease-out);
}
.end.on{opacity:1;transform:none}
.end-mark{color:var(--ink);margin-bottom:clamp(24px,4vh,40px)}
.end-mark svg{width:clamp(120px,15vw,168px);height:auto}
.end-word{font-size:clamp(38px,7.4vw,96px);font-weight:500;letter-spacing:.16em;
  line-height:1;text-indent:.02em}
.end-tag{margin-top:14px;font-family:var(--mono);font-size:clamp(12px,1.15vw,15px);
  letter-spacing:.14em;color:var(--ink-3)}
.end-meta{margin-top:clamp(30px,5vh,54px);display:flex;align-items:center;gap:.9em;flex-wrap:wrap;
  font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;color:var(--ink-4)}
.em-dot{width:3px;height:3px;border-radius:50%;background:var(--ink-4);display:block}

/* ══ MOBILE / TABLET — redesigned, not scaled down ══ */
@media (max-width:1024px){
  .triad{grid-template-columns:1fr}
  .tri{border-right:0}
  .tri-i{margin-bottom:22px}
  .tri-b{max-width:52ch}
  .readout{grid-template-columns:repeat(2,1fr)}
  .readout > div{padding:14px 0;border-bottom:1px solid var(--hair-2)}
  .readout > div:nth-child(2n){border-right:0}
  .node{grid-template-columns:auto 1fr auto;gap:.5em 1.1em;align-items:start}
  .nd-ref{grid-column:1;grid-row:1}
  .nd-main{grid-column:2 / -1;grid-row:1}
  .nd-st{grid-column:2;grid-row:2;margin-top:12px}
  .nd-cy{grid-column:3;grid-row:2;margin-top:12px;justify-self:end}
  .nd-go{display:none}
  .nd-grid{grid-template-columns:1fr;gap:26px}
}
@media (max-width:760px){
  :root{--fs-micro:12px;--fs-mono:13px}
  #hud-state{display:none}
  #field-grade{background:
    radial-gradient(120% 70% at 50% 40%,transparent 46%,rgba(4,4,6,.6) 100%),
    linear-gradient(to bottom,rgba(8,8,10,.8) 0%,transparent 20%,transparent 72%,rgba(8,8,10,.9) 100%)}
  #hud-coords{display:none}
  #hud-rail{bottom:calc(max(14px,env(safe-area-inset-bottom)) + 4px);gap:10px}
  .rail-marks{display:none}
  .rail-pct{min-width:7.2em}
  #snd{bottom:calc(max(14px,env(safe-area-inset-bottom)) + 46px);
    min-height:40px;padding:9px 13px;font-size:var(--fs-micro)}
  .snd-bars{height:13px}
  .dims{grid-template-columns:1fr;gap:0;border-radius:3px}
  .dim{display:grid;grid-template-columns:auto 1fr;gap:.35em 1em;align-items:center;
    padding:16px 18px}
  .dm-k{grid-row:span 2;margin:0;padding-top:.2em}
  .dm-b{grid-column:2;margin-top:10px}
  .sig{grid-template-columns:1fr}
  /* archive table → stacked records */
  .arc-table thead{display:none}
  .arc-table,.arc-table tbody,.arc-table tr,.arc-table td{display:block}
  .arc-table tr{border-bottom:1px solid var(--hair-2);padding:16px 0}
  .arc-table tr:last-child{border-bottom:0}
  .arc-table td{border:0;padding:2px 0;font-size:var(--fs-body)}
  .arc-table td::before{
    content:attr(data-l);display:inline-block;min-width:74px;
    font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;color:var(--ink-4);
  }
  .arc-table .c-node{font-size:var(--fs-lede);margin-bottom:6px}
  .arc-table .c-node::before{display:none}
  .arc-table tr:hover td{background:none}
  .note{flex-direction:column;gap:.5em}
  .end-word{letter-spacing:.1em}
  .ln .inner{will-change:auto}
}
@media (max-width:420px){
  .wrap{padding-inline:18px}
  .end-meta{flex-direction:column;align-items:flex-start;gap:.45em}
  .em-dot{display:none}
}

/* ══ REDUCED MOTION — cut movement and speed, never content ══ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important}
  #field-grain::after{animation:none}
  #snd[aria-pressed="true"] .snd-bars i{animation:none;height:7px}
  html.js .rv .ln .inner,html.js .rv-fx{transform:none!important;opacity:1!important}
  .end{opacity:1;transform:none}
  #boot{display:none}
  .boot-meter i{width:100%}
}

/* ── CHANNEL: the one outward door on the site ─────────── */
.chan{margin-top:72px;padding-top:34px;border-top:1px solid rgba(237,235,231,.17)}
.chan-k{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.22em;
  text-transform:uppercase;color:var(--accent);margin:0 0 22px}
.chan-l{font-size:clamp(15px,1.35vw,19px);line-height:1.65;color:var(--ink-2);
  max-width:54ch;margin:0 0 30px}
.chan-a{position:relative;display:inline-block;font-size:clamp(19px,2.1vw,34px);
  letter-spacing:-.015em;color:var(--ink);text-decoration:none;padding-bottom:10px;
  transition:color .35s var(--ease-out)}
.chan-a::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;
  background:var(--accent-dim);transition:background .35s var(--ease-out),transform .45s var(--ease-out);
  transform-origin:0 50%}
.chan-a:hover{color:var(--accent)}
.chan-a:hover::after{background:var(--accent)}
.chan-a:focus-visible{outline:1px solid var(--accent);outline-offset:6px}
@media (max-width:760px){.chan{margin-top:52px;padding-top:26px}.chan-l{font-size:15px}
  .chan-a{font-size:20px}}

/* ── NAME: the wordmark read as its structure ───────────── */
.h-display .wm-x,.wm-x{padding:0 .055em}
.h-display .inner .wm-x{color:var(--accent-lift);font-weight:600}
.name{display:block;margin:46px 0 0;font-family:var(--mono);font-size:clamp(12px,1.05vw,14px);
  letter-spacing:.20em;text-transform:uppercase;color:var(--ink)}
.n-f{color:var(--ink)}
.n-x{color:var(--accent);padding:0 .42em}
@media (max-width:760px){.name{margin-top:24px;font-size:11.5px;letter-spacing:.14em}}

/* the fixed coordinate readout needs its own ground so it never reads as
   inline text next to the columns */
#hud-coords::before{content:"";position:absolute;inset:-24px -28px -26px -80px;
  background:radial-gradient(72% 82% at 32% 50%,rgba(8,8,10,.94) 0%,rgba(8,8,10,.62) 54%,rgba(8,8,10,0) 100%);
  z-index:-1;pointer-events:none}