/* ============================================================
   whoami · las leyes que rigen lo real
   Estética: observatorio / espacio profundo
   ============================================================ */

:root{
  --void:        #05060b;
  --void-2:      #080a12;
  --panel:       rgba(255,255,255,.022);
  --panel-line:  rgba(255,255,255,.085);
  --hair:        rgba(255,255,255,.13);

  --ink:         #ece9e0;
  --ink-soft:    #c4c2b8;
  --ink-dim:     #837f74;
  --ink-faint:   #565248;

  --gold:        #e3b25c;
  --gold-soft:   #f0cd8c;
  --cyan:        #6fe0e6;
  --cyan-soft:   #a8f0f3;
  --violet:      #a99cff;
  --violet-soft: #c8bfff;

  --accent:      var(--cyan);
  --accent-soft: var(--cyan-soft);

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono:  "IBM Plex Mono", "SF Mono", ui-monospace, monospace;

  --maxw: 760px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }

body{
  background: var(--void);
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.02rem, .55rem + .85vw, 1.22rem);
  line-height: 1.72;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection{ background: rgba(111,224,230,.22); color:#fff; }

/* ---------- background layers ---------- */
#starfield{
  position: fixed; inset:0;
  width:100%; height:100%;
  z-index:-3;
  display:block;
}
.vignette{
  position: fixed; inset:0; z-index:-2; pointer-events:none;
  background:
    radial-gradient(120% 90% at 50% -10%, rgba(40,60,90,.20), transparent 55%),
    radial-gradient(120% 120% at 50% 110%, rgba(60,40,70,.16), transparent 60%),
    radial-gradient(140% 100% at 50% 50%, transparent 40%, rgba(0,0,0,.55) 100%);
}
.grain{
  position: fixed; inset:0; z-index:-1; pointer-events:none; opacity:.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* ---------- scroll progress ---------- */
.scroll-progress{
  position: fixed; top:0; left:0; right:0; height:2px; z-index:60;
  background: rgba(255,255,255,.04);
}
.scroll-bar{
  display:block; height:100%; width:0%;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  box-shadow: 0 0 14px rgba(111,224,230,.6);
  transition: width .08s linear;
}

/* ---------- rail nav ---------- */
.rail{
  position: fixed; right: clamp(.6rem,2vw,1.6rem); top:50%;
  transform: translateY(-50%); z-index:50;
  display:flex; flex-direction:column; gap:.35rem;
  font-family: var(--mono);
}
.rail a{
  position: relative;
  width:2.1rem; height:2rem;
  display:flex; align-items:center; justify-content:center;
  font-size:.68rem; letter-spacing:.05em;
  color: var(--ink-faint); text-decoration:none;
  border-right: 1px solid transparent;
  transition: color .3s, border-color .3s;
}
.rail a::after{ /* tooltip */
  content: attr(data-label);
  position:absolute; right:120%; top:50%; transform:translateY(-50%);
  white-space:nowrap; font-size:.6rem; letter-spacing:.14em; text-transform:uppercase;
  color: var(--ink-dim); background: rgba(8,10,18,.9);
  border:1px solid var(--hair); padding:.25rem .5rem; border-radius:2px;
  opacity:0; pointer-events:none; transition:opacity .25s;
}
.rail a:hover{ color: var(--ink); }
.rail a:hover::after{ opacity:1; }
.rail a.active{ color: var(--accent, var(--cyan)); border-right-color: var(--accent, var(--cyan)); }
.rail-cross{ margin-top:.45rem; padding-top:.45rem; border-top:1px solid rgba(255,255,255,.14); opacity:.7; }
.rail-cross:hover{ opacity:1; }

/* ---------- reveal ---------- */
.reveal{ opacity:0; transform: translateY(26px); transition: opacity 1s cubic-bezier(.2,.7,.2,1), transform 1s cubic-bezier(.2,.7,.2,1); }
.reveal.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1 !important; transform:none !important; transition:none; }
  html{ scroll-behavior:auto; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  min-height: 100svh;
  display:flex; align-items:center; justify-content:center;
  padding: 6rem var(--gutter) 4rem;
  position:relative;
}
.hero-inner{ max-width: 860px; text-align:center; }

.terminal{
  font-family: var(--mono); font-size: clamp(.72rem,.5rem+.5vw,.92rem);
  letter-spacing:.02em; margin-bottom: 2.4rem; color: var(--ink-dim);
}
.terminal .prompt{ color: var(--cyan-soft); }
.terminal .sep{ color: var(--ink-faint); }
.terminal .path{ color: var(--gold-soft); }
.terminal .dollar{ color: var(--ink-faint); margin:0 .5ch 0 .25ch; }
.terminal .cmd{ color: var(--ink); }
.caret{ color: var(--cyan); animation: blink 1.05s steps(1) infinite; font-weight:600; }
@keyframes blink{ 50%{ opacity:0; } }

.hero-title{
  font-weight: 300;
  font-size: clamp(2.5rem, 1rem + 6vw, 5.4rem);
  line-height: 1.04;
  letter-spacing: -.018em;
  margin-bottom: 1.8rem;
}
.hero-title .line{ display:block; }
.hero-title em{
  font-style: italic; font-weight:400;
  color: var(--gold);
  text-shadow: 0 0 34px rgba(227,178,92,.4);
}
.hero-sub{
  max-width: 56ch; margin: 0 auto 2.6rem;
  color: var(--ink-soft); font-size: 1.06rem; line-height:1.75;
}
.hero-sub strong{ color: var(--ink); font-weight:500; }
.hero-eq{
  font-size: 1.15rem;
  padding: 1.3rem 1.6rem;
  display:inline-block;
  border-top:1px solid var(--hair); border-bottom:1px solid var(--hair);
  color: var(--cyan-soft);
}
.hero-eq .katex{ text-shadow: 0 0 26px rgba(111,224,230,.45); }

.hero-scroll{
  position:absolute; bottom:2rem; left:50%; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:.6rem;
  font-family:var(--mono); font-size:.6rem; letter-spacing:.3em; text-transform:uppercase;
  color: var(--ink-faint);
}
.hero-scroll i{ width:1px; height:42px; background:linear-gradient(var(--ink-faint),transparent); animation: drop 2.4s ease-in-out infinite; }
@keyframes drop{ 0%,100%{ transform:scaleY(.4); transform-origin:top; opacity:.4;} 50%{ transform:scaleY(1); opacity:1;} }

/* ============================================================
   MOVEMENTS
   ============================================================ */
.movement{
  --accent: var(--cyan); --accent-soft: var(--cyan-soft);
  position:relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(5rem, 12vh, 9rem) var(--gutter);
}
.movement[data-accent="gold"]{ --accent: var(--gold); --accent-soft: var(--gold-soft); }
.movement[data-accent="cyan"]{ --accent: var(--cyan); --accent-soft: var(--cyan-soft); }
.movement[data-accent="violet"]{ --accent: var(--violet); --accent-soft: var(--violet-soft); }
.movement[data-accent="neutral"]{ --accent: var(--ink-soft); --accent-soft: var(--ink); }
.movement[data-accent="tri"]{ --accent: var(--cyan); --accent-soft: var(--cyan-soft); }

.movement + .movement{ border-top:1px solid rgba(255,255,255,.05); }

.m-head{ position:relative; margin-bottom: 2.8rem; }
.eyebrow{
  display:block; font-family:var(--mono); font-size:.66rem; font-weight:500;
  letter-spacing:.22em; text-transform:uppercase; color: var(--accent);
  margin-bottom: 1.4rem;
}
.numeral{
  position:absolute; top:-2.6rem; right:-.4rem;
  font-family: var(--serif); font-style:italic; font-weight:300;
  font-size: clamp(6rem, 16vw, 12rem); line-height:1;
  color: var(--accent);
  opacity:.10; pointer-events:none; user-select:none; z-index:-1;
}
.m-head h2{
  font-weight: 400; letter-spacing:-.015em;
  font-size: clamp(2rem, 1rem + 3.6vw, 3.4rem);
  line-height:1.08; margin-bottom:1.1rem;
}
.lede{
  font-size: clamp(1.1rem, .9rem + .6vw, 1.32rem);
  color: var(--ink-soft); font-style:italic; font-weight:300;
  line-height:1.6; max-width: 60ch;
}
.lede strong{ font-style:normal; }

.prose{ margin: 1.6rem 0; }
.prose p{ margin-bottom: 1.25rem; color: var(--ink-soft); }
.prose p:last-child{ margin-bottom:0; }
.prose strong{ color: var(--ink); font-weight:500; }
.prose em{ color: var(--accent-soft); font-style:italic; }

/* ---------- equation cards ---------- */
.eqrow{ display:grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2.2rem 0; }
.eqcard{
  background: linear-gradient(180deg, var(--panel), rgba(255,255,255,.008));
  border:1px solid var(--panel-line);
  border-radius: 4px;
  padding: 1.7rem 1.5rem 1.3rem;
  position:relative; overflow:hidden;
  transition: border-color .6s, box-shadow .6s;
}
.eqcard.wide, .eqcard:not(.eqrow .eqcard){ margin: 2.2rem 0; }
.eqrow .eqcard{ margin:0; }
.eqcard::before{
  content:""; position:absolute; left:0; top:0; bottom:0; width:2px;
  background: var(--accent); opacity:.5;
  box-shadow: 0 0 18px var(--accent);
}
.eqcard.in{ border-color: color-mix(in srgb, var(--accent) 32%, var(--panel-line)); box-shadow: 0 0 40px rgba(0,0,0,.4), inset 0 0 36px rgba(255,255,255,.012); }
.eqcard .katex-display{ margin:.2rem 0 1.1rem; }
.eqcard .katex{ color: var(--ink); }
.eqcard.in .katex{ text-shadow: 0 0 22px color-mix(in srgb, var(--accent) 50%, transparent); }
.eqcard figcaption{
  font-family: var(--mono); font-size:.74rem; line-height:1.55;
  color: var(--ink-dim); letter-spacing:.01em;
}
.eqcard .tag{
  display:inline-block; color: var(--accent); font-weight:500;
  letter-spacing:.08em; text-transform:uppercase; font-size:.64rem;
  margin-right:.5ch; margin-bottom:.35rem;
}
.eqcard.wide{ text-align:center; }
.eqcard.wide .katex-display{ overflow-x:auto; overflow-y:hidden; padding-bottom:.4rem; }

/* ---------- quotes ---------- */
.quote{
  margin: 3rem 0 1rem;
  padding-left: 1.6rem;
  border-left: 2px solid var(--accent);
}
.quote.bare{ border:0; padding:0; text-align:center; margin-top:2.4rem; }
.q-orig{
  font-size: clamp(1.3rem, 1rem + 1.4vw, 1.85rem);
  font-style:italic; font-weight:300; line-height:1.4; color: var(--ink);
  letter-spacing:-.01em;
}
.q-tr{ margin-top:.9rem; color: var(--ink-dim); font-size:1rem; line-height:1.6; }
.quote cite{
  display:block; margin-top:1.1rem; font-style:normal;
  font-family:var(--mono); font-size:.72rem; letter-spacing:.1em;
  text-transform:uppercase; color: var(--accent);
}

/* ---------- collapse demo ---------- */
.collapse-demo{
  margin: 2.6rem 0; position:relative;
  border:1px solid var(--panel-line); border-radius:4px;
  background: radial-gradient(120% 120% at 50% 40%, rgba(111,224,230,.04), transparent 70%);
  padding: .4rem;
}
.collapse-demo canvas{ width:100%; height:auto; display:block; border-radius:3px; cursor:crosshair; }
.collapse-btn{
  position:absolute; top:1rem; right:1rem; z-index:2;
  font-family:var(--mono); font-size:.7rem; letter-spacing:.12em; text-transform:uppercase;
  color: var(--cyan); background: rgba(8,12,20,.7); cursor:pointer;
  border:1px solid color-mix(in srgb, var(--cyan) 40%, transparent);
  padding:.5rem .9rem; border-radius:2px; transition: background .25s, box-shadow .25s;
}
.collapse-btn:hover{ background: rgba(111,224,230,.12); box-shadow:0 0 18px rgba(111,224,230,.3); }
.collapse-demo figcaption{
  font-family:var(--mono); font-size:.72rem; color:var(--ink-dim); line-height:1.55;
  padding:.8rem 1rem 1rem;
}
.collapse-demo .tag{ color:var(--cyan); text-transform:uppercase; letter-spacing:.08em; font-size:.62rem; margin-right:.5ch; }

/* ---------- triad ---------- */
.triad{ display:grid; grid-template-columns: repeat(3,1fr); gap:1rem; margin:2.6rem 0; }
.triad-card{
  --accent: var(--cyan); --accent-soft: var(--cyan-soft);
  border:1px solid var(--panel-line); border-radius:4px;
  padding: 1.6rem 1.3rem; position:relative; overflow:hidden;
  background: linear-gradient(180deg, var(--panel), transparent);
}
.triad-card[data-accent="gold"]{ --accent:var(--gold); --accent-soft:var(--gold-soft); }
.triad-card[data-accent="cyan"]{ --accent:var(--cyan); --accent-soft:var(--cyan-soft); }
.triad-card[data-accent="violet"]{ --accent:var(--violet); --accent-soft:var(--violet-soft); }
.triad-card::after{
  content:""; position:absolute; inset:0 0 auto 0; height:2px;
  background:var(--accent); box-shadow:0 0 16px var(--accent); opacity:.7;
}
.triad-who{ font-family:var(--mono); font-size:.64rem; letter-spacing:.2em; text-transform:uppercase; color:var(--ink-dim); }
.triad-card h3{
  font-weight:400; font-size:1.6rem; margin:.5rem 0 .8rem; color:var(--accent-soft);
  text-shadow:0 0 24px color-mix(in srgb, var(--accent) 35%, transparent);
}
.triad-card p{ font-size:.92rem; line-height:1.55; color:var(--ink-soft); }
.triad-eq{ display:block; margin-top:1rem; color:var(--ink-dim); font-size:.85rem; }

/* ---------- ledger ---------- */
.ledger{ margin:2.4rem 0; border-top:1px solid var(--hair); }
.ledger-row{
  display:grid; grid-template-columns: 1.1fr 1fr 1.6fr; gap:1.2rem;
  padding:1.1rem .2rem; border-bottom:1px solid rgba(255,255,255,.06);
  align-items:baseline;
}
.ledger-row span:first-child{ color: var(--cyan-soft); }
.ledger-row span:nth-child(2){ color: var(--gold-soft); font-style:italic; }
.ledger-row span:last-child{ color: var(--ink-soft); font-size:.95rem; line-height:1.5; }
.ledger-head{ border-bottom:1px solid var(--hair); }
.ledger-head span{
  font-family:var(--mono)!important; font-size:.64rem!important; letter-spacing:.2em;
  text-transform:uppercase; color:var(--ink-dim)!important; font-style:normal!important;
}

/* ---------- manual ---------- */
.manual{
  margin:2.6rem 0; padding:2rem 1.8rem;
  border:1px solid var(--panel-line); border-radius:4px;
  background: linear-gradient(180deg, rgba(227,178,92,.04), transparent);
}
.manual-title{
  display:block; font-family:var(--mono); font-size:.66rem; letter-spacing:.2em;
  text-transform:uppercase; color:var(--gold); margin-bottom:1.4rem;
}
.manual ol{ list-style:none; display:flex; flex-direction:column; gap:1.3rem; }
.manual li{ position:relative; padding-left:3.2rem; color:var(--ink-soft); line-height:1.6; }
.manual .mn{
  position:absolute; left:0; top:.05rem;
  font-family:var(--mono); font-size:.8rem; color:var(--gold); opacity:.8;
  border:1px solid color-mix(in srgb,var(--gold) 30%, transparent);
  border-radius:50%; width:2.1rem; height:2.1rem; display:flex; align-items:center; justify-content:center;
}
.manual b{ color:var(--ink); font-weight:600; }

/* ---------- finale ---------- */
.finale{ margin-top:3rem; text-align:center; padding-top:2.5rem; border-top:1px solid var(--hair); }
.finale .terminal{ margin-bottom:1.6rem; }
.finale-answer{
  font-family: var(--serif); font-style:italic; font-weight:300;
  font-size: clamp(1.5rem, 1rem + 2.4vw, 2.6rem); line-height:1.25;
  color: var(--gold-soft); letter-spacing:-.01em;
  text-shadow: 0 0 40px rgba(227,178,92,.3);
  max-width: 22ch; margin: 0 auto;
}

/* ---------- sources ---------- */
.sources .src-grid{ display:grid; grid-template-columns: repeat(2,1fr); gap:1rem; margin:2.2rem 0; }
.src{ border:1px solid var(--panel-line); border-radius:4px; padding:1.4rem 1.3rem; background:var(--panel); }
.src h4{ font-weight:500; font-size:1.15rem; margin-bottom:.5rem; }
.src p{ font-size:.9rem; color:var(--ink-soft); line-height:1.55; margin-bottom:.5rem; }
.src-ref{ font-family:var(--mono); font-size:.72rem!important; color:var(--ink-dim)!important; }
.src-ref i{ color:var(--ink-soft); }
.caveat{
  margin:2rem 0; padding:1.6rem 1.6rem; border-radius:4px;
  border:1px dashed var(--hair); background:rgba(255,255,255,.012);
}
.caveat p{ font-size:.92rem; color:var(--ink-dim); line-height:1.65; }
.caveat strong{ color:var(--ink-soft); }
.colophon{
  margin-top:3rem; text-align:center; font-family:var(--mono);
  font-size:.68rem; letter-spacing:.12em; color:var(--ink-faint);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px){
  .rail{ display:none; }
  .eqrow{ grid-template-columns: 1fr; }
  .triad{ grid-template-columns: 1fr; }
  .ledger-row{ grid-template-columns: 1fr; gap:.3rem; padding:1rem .1rem; }
  .ledger-head{ display:none; }
  .ledger-row span:last-child{ font-size:.88rem; }
  .sources .src-grid{ grid-template-columns:1fr; }
  .numeral{ right:0; top:-1.8rem; opacity:.08; }
  .manual{ padding:1.5rem 1.1rem; }
}
@media (max-width: 460px){
  .terminal{ font-size:.66rem; }
  .collapse-btn{ top:.6rem; right:.6rem; }
}

/* ============================================================
   MODO ILUSIÓN ⇄ REAL
   El interruptor es la metáfora de Hoffman hecha interacción:
   Ilusión = la interfaz de íconos · Real = el código de debajo.
   ============================================================ */

/* ---------- interruptor ---------- */
.mode-switch{
  position: fixed; top:.9rem; left:50%; transform:translateX(-50%);
  z-index:70; display:flex; flex-direction:column; align-items:center; gap:.4rem;
  text-align:center;
}
.switch{
  display:flex; align-items:center; gap:.65rem;
  background: rgba(8,10,18,.72); -webkit-backdrop-filter:blur(9px); backdrop-filter:blur(9px);
  border:1px solid var(--hair); border-radius:999px;
  padding:.42rem .6rem; cursor:pointer;
  font-family: var(--mono);
  box-shadow: 0 6px 26px rgba(0,0,0,.4);
  animation: swPulse 2.6s ease-out 3;
}
.switch:focus-visible{ outline:2px solid var(--cyan); outline-offset:3px; }
@keyframes swPulse{
  0%,100%{ box-shadow:0 6px 26px rgba(0,0,0,.4), 0 0 0 0 rgba(227,178,92,0); }
  50%{ box-shadow:0 6px 26px rgba(0,0,0,.4), 0 0 0 6px rgba(227,178,92,.10); }
}
.switch-label{
  font-size:.62rem; letter-spacing:.18em; text-transform:uppercase;
  color: var(--ink-faint); transition: color .35s, text-shadow .35s; padding:0 .1rem;
}
.switch-illusion{ color: var(--gold); text-shadow:0 0 14px rgba(227,178,92,.4); }
.switch[aria-checked="true"] .switch-illusion{ color: var(--ink-faint); text-shadow:none; }
.switch[aria-checked="true"] .switch-real{ color: var(--cyan); text-shadow:0 0 14px rgba(111,224,230,.4); }
.switch-track{
  position:relative; width:48px; height:24px; border-radius:999px;
  background: rgba(255,255,255,.05); border:1px solid var(--hair);
}
.switch-knob{
  position:absolute; top:50%; left:4px; transform:translateY(-50%);
  width:18px; height:18px; border-radius:50%;
  background: var(--gold); box-shadow:0 0 14px var(--gold);
  transition: left .38s cubic-bezier(.5,1.7,.4,1), background .38s, box-shadow .38s;
}
.switch[aria-checked="true"] .switch-knob{ left:26px; background: var(--cyan); box-shadow:0 0 14px var(--cyan); }
.mode-hint{
  font-family: var(--mono); font-size:.56rem; letter-spacing:.14em;
  text-transform:uppercase; color: var(--ink-faint);
}

/* ---------- transición (parpadeo de "casco") ---------- */
.mode-flash{
  position:fixed; inset:0; z-index:65; pointer-events:none; opacity:0;
  background:
    radial-gradient(120% 120% at 50% 50%, rgba(111,224,230,.10), transparent 60%),
    rgba(5,6,11,.55);
  transition: opacity .14s ease;
}
.mode-flash.flash{ opacity:1; }

/* ---------- visibilidad por modo ---------- */
.illusion{ display:none; }
html.mode-illusion .illusion{ display:block; }

html.mode-illusion .hero-sub,
html.mode-illusion .hero-eq,
html.mode-illusion .eyebrow,
html.mode-illusion .lede,
html.mode-illusion .prose,
html.mode-illusion .eqrow,
html.mode-illusion .movement > .eqcard,
html.mode-illusion .collapse-demo,
html.mode-illusion .quote,
html.mode-illusion .triad,
html.mode-illusion .ledger,
html.mode-illusion .manual,
html.mode-illusion .caveat,
html.mode-illusion .sources .src-grid{ display:none !important; }

html.mode-illusion .m-head{ margin-bottom:1.5rem; }
html.mode-illusion .movement{ padding-top:clamp(3.5rem,9vh,6rem); padding-bottom:clamp(3.5rem,9vh,6rem); }
html.mode-illusion .grain{ opacity:.03; }

/* ---------- tarjeta-ícono ---------- */
.ill-card{
  text-align:center; max-width:48ch; margin:0 auto;
  padding:2.2rem 1.8rem;
  border:1px solid var(--panel-line); border-radius:18px;
  background: linear-gradient(180deg, var(--panel), rgba(255,255,255,.006));
}
.ill-icon{
  color: var(--accent, var(--cyan));
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--accent, var(--cyan)) 55%, transparent));
  margin-bottom:1.4rem;
}
.ill-icon svg{ width:clamp(96px,28vw,128px); height:auto; }
.ill-icon-lg svg{ width:clamp(120px,34vw,172px); }
.ill-line{
  font-family: var(--serif); font-weight:300;
  font-size: clamp(1.18rem, .95rem + 1vw, 1.6rem); line-height:1.42;
  color: var(--ink); letter-spacing:-.01em; max-width:34ch; margin:0 auto;
}
.ill-line strong{ color: var(--accent-soft, var(--cyan-soft)); font-weight:500; }
.ill-line em{ color: var(--ink); font-style:italic; }
.ill-stamp{
  display:inline-block; margin-top:1.5rem;
  padding:.5rem 1.1rem; border-radius:999px;
  border:1px solid color-mix(in srgb, var(--accent, var(--cyan)) 30%, var(--panel-line));
  background: rgba(255,255,255,.015);
}
.ill-stamp .katex{ color: var(--accent-soft, var(--cyan-soft)); font-size:1.05em; }

.ill-chips{
  display:flex; flex-wrap:wrap; gap:.5rem; justify-content:center; margin-top:1.5rem;
}
.ill-chips span{
  font-family: var(--mono); font-size:.64rem; letter-spacing:.1em; text-transform:uppercase;
  padding:.4rem .8rem; border-radius:999px;
  border:1px solid var(--panel-line); color: var(--ink-soft);
}
.ill-chips span[data-accent="gold"]{ color: var(--gold-soft); border-color: color-mix(in srgb, var(--gold) 36%, transparent); }
.ill-chips span[data-accent="cyan"]{ color: var(--cyan-soft); border-color: color-mix(in srgb, var(--cyan) 36%, transparent); }
.ill-chips span[data-accent="violet"]{ color: var(--violet-soft); border-color: color-mix(in srgb, var(--violet) 36%, transparent); }
.ill-chips span[data-accent="neutral"]{ color: var(--ink-dim); }

/* ---------- hero en modo ilusión ---------- */
.hero-illusion{ margin-top:2.4rem; max-width:42ch; }
.hero-illusion .ill-line{
  font-size: clamp(1.2rem,1rem+1vw,1.55rem); color: var(--ink); max-width:38ch;
}
.hero-illusion .ill-note{
  margin-top:1.4rem; font-family:var(--mono); font-size:.72rem; line-height:1.7;
  letter-spacing:.02em; color: var(--ink-dim); max-width:46ch; margin-inline:auto;
}
.hero-illusion .ill-note b{ color: var(--ink-soft); font-weight:500; }

/* ---------- entrada ---------- */
html.mode-illusion .ill-card,
html.mode-illusion .hero-illusion{ animation: illIn .65s cubic-bezier(.2,.7,.2,1) both; }
@keyframes illIn{ from{ opacity:0; transform:translateY(22px) scale(.985);} to{ opacity:1; transform:none; } }

@media (prefers-reduced-motion: reduce){
  .switch{ animation:none; }
  .switch-knob{ transition:none; }
  html.mode-illusion .ill-card,
  html.mode-illusion .hero-illusion{ animation:none; }
  .mode-flash{ transition:none; }
}

@media (max-width: 560px){
  .ill-card{ padding:1.7rem 1.2rem; border-radius:14px; }
  .mode-hint{ font-size:.5rem; }
  .switch-label{ font-size:.58rem; }
}

/* ============================================================
   OBSERVAR — la materia cambia al mirarla
   Cada clic "mide" la tarjeta: colapsa y se reforma con
   información más profunda. Al 3er estado, vuelve a la superposición.
   ============================================================ */
.ill-card[data-observe]{
  position:relative; overflow:hidden; cursor:pointer;
  transition: border-color .3s, box-shadow .3s, transform .25s;
}
.ill-card[data-observe]:hover,
.ill-card[data-observe]:focus-visible{
  border-color: color-mix(in srgb, var(--accent) 42%, var(--panel-line));
  box-shadow: 0 0 44px color-mix(in srgb, var(--accent) 15%, transparent);
  outline:none;
}
.ill-card[data-observe]:active{ transform: scale(.992); }

/* destello radial desde el punto de "medición" */
.ill-card[data-observe]::after{
  content:""; position:absolute; left:var(--mx,50%); top:var(--my,50%);
  width:10px; height:10px; border-radius:50%;
  transform:translate(-50%,-50%) scale(0); opacity:0; pointer-events:none;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 65%, transparent), transparent 70%);
}
.ill-card.collapsing::after{ animation: obRipple .55s ease-out; }
@keyframes obRipple{
  0%{ opacity:.7; transform:translate(-50%,-50%) scale(0); }
  100%{ opacity:0; transform:translate(-50%,-50%) scale(34); }
}

.ill-state[hidden]{ display:none; }

/* colapso (al medir) y reforma (estado nuevo) */
.ill-card.collapsing .ill-state{ animation: stCollapse .26s ease-in forwards; }
.ill-card.reforming  .ill-state{ animation: stReform .44s cubic-bezier(.2,.7,.2,1) both; }
@keyframes stCollapse{ to{ opacity:0; filter:blur(7px); transform:scale(.965); } }
@keyframes stReform{
  from{ opacity:0; filter:blur(9px); transform:translateY(9px) scale(.98); }
  to{ opacity:1; filter:none; transform:none; }
}
.ill-card.collapsing .ill-icon{ animation: icoCollapse .26s ease-in forwards; }
.ill-card.reforming  .ill-icon{ animation: icoReform .52s cubic-bezier(.3,.8,.3,1); }
@keyframes icoCollapse{ to{ transform:scale(.82); filter:drop-shadow(0 0 30px var(--accent)) blur(2px); } }
@keyframes icoReform{ 0%{ transform:scale(.82); } 58%{ transform:scale(1.09); } 100%{ transform:scale(1); } }

/* pie: invitación + estado de observación */
.observe-foot{
  display:flex; align-items:center; justify-content:center; gap:.85rem;
  margin-top:1.7rem;
}
.observe-cue{
  font-family: var(--mono); font-size:.6rem; letter-spacing:.16em; text-transform:uppercase;
  color: color-mix(in srgb, var(--accent) 78%, var(--ink-dim));
  display:inline-flex; align-items:center; gap:.45rem;
  animation: cuePulse 2.8s ease-in-out infinite;
}
.observe-cue::before{ content:"\25C9"; font-size:.85em; opacity:.9; }
@keyframes cuePulse{ 0%,100%{ opacity:.5; } 50%{ opacity:1; } }
.observe-dots{ display:inline-flex; gap:.36rem; }
.observe-dots i{
  width:6px; height:6px; border-radius:50%;
  background: var(--panel-line); transition: background .3s, box-shadow .3s, transform .3s;
}
.observe-dots i.on{ background: var(--accent); box-shadow:0 0 9px var(--accent); transform:scale(1.15); }

.ill-cmd{
  font-family: var(--mono); color: var(--accent-soft, var(--gold-soft));
  font-size:.86em; letter-spacing:.02em;
}

@media (prefers-reduced-motion: reduce){
  .ill-card.collapsing .ill-state, .ill-card.reforming .ill-state,
  .ill-card.collapsing .ill-icon, .ill-card.reforming .ill-icon,
  .ill-card.collapsing::after{ animation:none !important; }
  .observe-cue{ animation:none; opacity:.8; }
}

/* ============================================================
   MOVIMIENTO XI — rejilla de 4 tarjetas en una sola sección
   (el resto de movimientos lleva una tarjeta; aquí son cuatro)
   ============================================================ */
.ill-cards{
  display:grid; grid-template-columns:repeat(2,1fr); gap:1.1rem;
  max-width:900px; margin:0 auto; align-items:start;
}
.ill-cards .ill-card{ max-width:none; margin:0; padding:1.9rem 1.5rem; }
.ill-cards .ill-icon{ margin-bottom:1.1rem; }
.ill-cards .ill-icon svg{ width:clamp(78px,16vw,108px); }
.ill-cards .ill-line{ font-size:clamp(1.04rem,.92rem+.55vw,1.3rem); }

/* acento por tarjeta (mismo patrón que .triad-card) */
.ill-card[data-accent="gold"]{   --accent:var(--gold);   --accent-soft:var(--gold-soft); }
.ill-card[data-accent="cyan"]{   --accent:var(--cyan);   --accent-soft:var(--cyan-soft); }
.ill-card[data-accent="violet"]{ --accent:var(--violet); --accent-soft:var(--violet-soft); }

@media (max-width: 720px){
  .ill-cards{ grid-template-columns:1fr; gap:.9rem; }
}

/* ============================================================
   MOVIMIENTO XI · CTA a Bdreams (visible en ambos modos)
   ============================================================ */
.lucid-cta{
  display:flex; flex-direction:column; align-items:center; gap:.85rem;
  margin: clamp(2.6rem,6vh,4rem) auto 0; text-align:center; max-width:48ch;
}
.lucid-cta .cta-line{
  font-family: var(--serif); font-style:italic; font-weight:300;
  font-size: clamp(1.16rem, 1rem + .8vw, 1.5rem); line-height:1.4; color: var(--ink);
}
.cta-btn{
  display:inline-flex; align-items:center; gap:.5rem;
  font-family: var(--mono); font-size:.78rem; letter-spacing:.1em; text-transform:uppercase;
  color: var(--void); background: var(--cyan);
  padding:.72rem 1.5rem; border-radius:999px; text-decoration:none; font-weight:500;
  box-shadow: 0 0 26px color-mix(in srgb, var(--cyan) 38%, transparent);
  transition: transform .25s, box-shadow .25s, background .25s;
}
.cta-btn:hover{ transform: translateY(-2px); box-shadow: 0 0 42px color-mix(in srgb, var(--cyan) 60%, transparent); }
.cta-btn:focus-visible{ outline:2px solid var(--cyan); outline-offset:3px; }
.cta-sub{
  font-family: var(--mono); font-size:.62rem; letter-spacing:.12em; text-transform:uppercase;
  color: var(--ink-faint);
}

/* ============================================================
   AGRADECIMIENTOS — footer (sustituye la sección Fuentes)
   Visible en ambos modos: es el crédito/cierre del sitio.
   ============================================================ */
.thanks{
  display:block; max-width: var(--maxw); margin: clamp(3.5rem,9vh,6rem) auto 0;
  padding: clamp(2.4rem,5vh,3.4rem) var(--gutter) clamp(2rem,5vh,3rem);
  border-top: 1px solid var(--hair);
}
.thanks-eyebrow{
  font-family: var(--mono); font-size:.62rem; letter-spacing:.24em; text-transform:uppercase;
  color: var(--gold); text-shadow:0 0 14px rgba(227,178,92,.3);
}
.thanks h3{
  font-family: var(--serif); font-weight:400; letter-spacing:-.01em;
  font-size: clamp(1.5rem, 1.1rem + 1.5vw, 2.1rem); margin:.45rem 0 .9rem; color: var(--ink);
}
.thanks-intro{ color: var(--ink-soft); font-size:.96rem; line-height:1.65; max-width:62ch; margin-bottom:2rem; }
.thanks-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:1rem; }
.thanks-grid .src{ display:flex; flex-direction:column; }
.thanks-grid .src h4{ font-weight:500; font-size:1.1rem; margin-bottom:.45rem; }
.soc{ display:flex; gap:.7rem; margin-top:auto; padding-top:.7rem; }
.soc a{ color: var(--ink-dim); display:inline-flex; transition: color .25s, transform .25s; }
.soc a:hover{ color: var(--cyan); transform: translateY(-1px); }
.soc svg{ width:18px; height:18px; }
.thanks-note{
  margin-top:1.9rem; padding:1.5rem 1.6rem; border-radius:4px;
  border:1px dashed var(--hair); background: rgba(255,255,255,.012);
}
.thanks-note p{ font-size:.9rem; color: var(--ink-dim); line-height:1.65; }
.thanks-note strong{ color: var(--ink-soft); }
.thanks-note em{ color: var(--ink-soft); font-style:italic; }
.thanks .colophon{ margin-top:2.4rem; }
@media (max-width: 720px){
  .thanks-grid{ grid-template-columns:1fr; }
}