:root{
  --bg:            #191919;
  --bg-alt:        #141414;
  --surface:       #1e1e1e;
  --surface-2:     #232323;
  --surface-3:     #2a2a2a;

  --text:          #f2f6f8;
  --text-2:        #b0ccdb;
  --muted:         #7d97a4;

  --accent:        #4dd0e1;
  --accent-hover:  #80deea;
  --accent-soft:   rgba(77,208,225,0.10);
  --accent-glow:   rgba(77,208,225,0.35);

  --tierra:        #a67c52;
  --tierra-soft:   rgba(166,124,82,0.12);
  --rojo:          #e66060;
  --rojo-soft:     rgba(230,96,96,0.12);
  --verde-selva:   #6ba368;
  --dorado:        #d4a852;

  --border:        rgba(255,255,255,0.08);
  --border-2:      rgba(255,255,255,0.14);
  --border-accent: rgba(77,208,225,0.28);

  --font: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Consolas', 'SFMono-Regular', 'Cascadia Code', Menlo, monospace;

  --radius: 8px;
  --radius-lg: 14px;
  --maxw: 1120px;
  --header-h: 92px;
  --header-h-mobile: 64px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.25);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.35);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 0 1px var(--border-accent), 0 8px 32px rgba(77,208,225,0.18);

  --t-fast: 0.15s ease;
  --t-med:  0.28s ease;
  --t-slow: 0.5s ease;
}

*, *::before, *::after{ box-sizing: border-box; }
html{
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video{ max-width: 100%; display: block; }
button{ font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
figure{ margin: 0; }
blockquote{ margin: 0; }

h1, h2, h3, h4, h5{
  font-weight: 600;
  margin: 0;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.2;
}
h1{ font-size: clamp(1.9rem, 4vw, 3rem); }
h2{ font-size: clamp(1.5rem, 2.8vw, 2rem); }
h3{ font-size: 1.25rem; }
h4{ font-size: 1.05rem; }
h5{ font-size: 0.92rem; }
p{ margin: 0 0 1em; }

a{ color: var(--accent); text-decoration: none; transition: color var(--t-fast); }
a:hover{ color: var(--accent-hover); }

code{
  font-family: var(--mono);
  background: var(--surface-2);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--accent);
}

::selection{ background: var(--accent); color: #08202a; }

a:focus-visible, button:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.wrap-wide{ max-width: 1360px; margin: 0 auto; padding: 0 24px; }

.text-center{ text-align: center; }
.mt-0{ margin-top: 0; }
.mt-1{ margin-top: 8px; }
.mt-2{ margin-top: 16px; }
.mt-3{ margin-top: 24px; }
.mt-4{ margin-top: 32px; }
.mb-0{ margin-bottom: 0; }
.hidden{ display: none !important; }
.is-hidden{ display: none !important; }
.sr-only{
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.divider{
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-2), transparent);
  margin: 48px 0;
  border: none;
}

header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(20, 20, 20, 0.88);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
.crumb{
  font-size: 0.76rem;
  color: var(--muted);
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
}
.crumb .wrap{ display: flex; gap: 6px; align-items: center; }
.crumb a{ color: var(--muted); }
.crumb a:hover{ color: var(--accent); }
.crumb .sep{ opacity: 0.4; }

.navbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 16px;
}
.brand{ display: flex; align-items: center; gap: 10px; text-decoration: none; flex: none; }
.brand img{
  height: 36px; width: 36px;
  border-radius: 8px; display: block;
  background: var(--surface); object-fit: cover;
}
.brand .txt{ display: flex; flex-direction: column; line-height: 1.15; }
.brand b{ font-size: 1.05rem; color: var(--text); letter-spacing: 0.01em; font-weight: 600; }
.brand span{ font-size: 0.72rem; color: var(--muted); letter-spacing: 0.02em; }

nav.links{ display: flex; gap: 4px; }
nav.links a{
  font-size: 0.88rem;
  text-decoration: none;
  color: var(--text-2);
  padding: 8px 14px;
  border-radius: 6px;
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}
nav.links a:hover{ color: var(--text); background: var(--surface); }
nav.links a.active{ color: var(--accent); background: var(--accent-soft); }

.navtoggle{
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 38px; height: 38px;
  border-radius: 6px;
  font-size: 1.15rem;
  transition: background var(--t-fast);
}
.navtoggle:hover{ background: var(--surface); }

.hero{
  padding: 64px 0 56px;
  position: relative;
  background:
    radial-gradient(circle at 82% 15%, rgba(77,208,225,0.09), transparent 55%),
    radial-gradient(circle at 15% 90%, rgba(166,124,82,0.06), transparent 55%);
  overflow: hidden;
}
.hero .grid{
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero .eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hero .eyebrow::before{
  content: "";
  width: 22px; height: 2px;
  background: var(--accent);
  display: inline-block;
  border-radius: 2px;
}
.hero h1{
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  line-height: 1.1;
  margin-top: 14px;
  letter-spacing: -0.02em;
}
.hero h1 .accent{ color: var(--accent); display: inline-block; }
.hero p.lead{
  color: var(--text-2);
  max-width: 58ch;
  margin-top: 18px;
  font-size: 1.05rem;
}
.hero .banner-img{
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  display: block;
  object-fit: cover;
  max-height: 320px;
  filter: saturate(0.9);
}
.hero .meta-row{
  display: flex;
  gap: 20px;
  margin-top: 26px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--muted);
}
.hero .meta-row span{ display: inline-flex; align-items: center; gap: 6px; }
.hero .meta-row span::before{
  content: "";
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

section{ padding: 72px 0; border-top: 1px solid var(--border); position: relative; }
section:first-of-type{ border-top: none; }

.section-head{ margin-bottom: 12px; }
.section-head .kicker{
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.section-head .kicker::before{
  content: "";
  width: 18px; height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.section-head h2{ font-size: clamp(1.5rem, 2.8vw, 2rem); margin-top: 8px; }
.section-sub{
  color: var(--muted);
  max-width: 66ch;
  margin: 12px 0 36px;
  font-size: 0.98rem;
}

.callout{
  display: flex;
  gap: 14px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 20px;
  margin: 24px 0;
}
.callout .label{
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  flex: none;
}
.callout p{ margin: 0; color: var(--text-2); font-size: 0.95rem; }
.callout.warn{ border-left-color: var(--rojo); background: var(--rojo-soft); }
.callout.warn .label{ color: var(--rojo); }
.callout.tierra{ border-left-color: var(--tierra); background: var(--tierra-soft); }
.callout.tierra .label{ color: var(--tierra); }

.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--accent);
  color: #08202a;
  text-decoration: none;
  padding: 11px 20px;
  border-radius: 6px;
  transition: background var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
  border: 1px solid transparent;
}
.btn:hover{
  background: var(--accent-hover);
  color: #08202a;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}
.btn-ghost{
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-2);
}
.btn-ghost:hover{
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-accent);
  box-shadow: none;
}
.btn svg{ width: 16px; height: 16px; }
.btn-row{ display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

.pill{
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 100px;
  background: var(--surface-2);
  color: var(--text-2);
  border: 1px solid var(--border);
}
.pill.accent{ background: var(--accent-soft); color: var(--accent); border-color: var(--border-accent); }
.pill.rojo{ background: var(--rojo-soft); color: var(--rojo); border-color: rgba(230,96,96,0.28); }
.pill.tierra{ background: var(--tierra-soft); color: var(--tierra); border-color: rgba(166,124,82,0.28); }

.toc ol{
  list-style: none;
  counter-reset: toc;
  padding: 0;
  display: grid;
  gap: 6px;
}
.toc li{ counter-increment: toc; }
.toc a{
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--text-2);
  transition: background var(--t-fast), color var(--t-fast);
}
.toc a::before{
  content: counter(toc, decimal-leading-zero);
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.8rem;
}
.toc a:hover{ background: var(--surface); color: var(--text); }

[data-quiz]{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 24px 0;
}
[data-quiz-q]{ margin-bottom: 20px; }
[data-quiz-q] [data-opt]{
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 16px;
  margin: 6px 0;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-2);
  transition: all var(--t-fast);
}
[data-quiz-q] [data-opt]:hover:not([disabled]){
  border-color: var(--border-accent);
  color: var(--text);
}
[data-quiz-q] [data-opt].correct{
  border-color: var(--verde-selva);
  color: var(--verde-selva);
  background: rgba(107,163,104,.08);
}
[data-quiz-q] [data-opt].wrong{
  border-color: var(--rojo);
  color: var(--rojo);
  background: var(--rojo-soft);
}
[data-feedback]{
  margin-top: 10px;
  font-size: .9rem;
  opacity: 0;
  transition: opacity var(--t-med);
  color: var(--muted);
}
[data-feedback].visible{ opacity: 1; }
[data-quiz-result]{
  margin-top: 20px;
  padding: 14px;
  background: var(--accent-soft);
  border-radius: 8px;
  color: var(--accent);
  font-weight: 600;
  opacity: 0;
  transition: opacity var(--t-med);
}
[data-quiz-result].visible{ opacity: 1; }

[data-timeline-range]{ width: 100%; accent-color: var(--accent); }
[data-timeline-step]{
  filter: opacity(.35);
  transition: filter var(--t-med);
}
[data-timeline-step].active{
  filter: opacity(1);
}

[data-accordion-item] [data-accordion-body]{
  overflow: hidden;
  height: 0;
  transition: height var(--t-med);
}
[data-accordion-head]{
  cursor: pointer;
  padding: 14px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
[data-accordion-head]::after{
  content: "+";
  color: var(--accent);
  font-size: 1.2rem;
  transition: transform var(--t-med);
}
[data-accordion-item].open [data-accordion-head]::after{ transform: rotate(45deg); }

.filter-bar{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 24px 0 32px;
}
.filter-bar [data-tipo]{
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .03em;
  padding: 7px 14px;
  border-radius: 100px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  transition: all var(--t-fast);
}
.filter-bar [data-tipo]:hover{ border-color: var(--border-accent); color: var(--text); }
.filter-bar [data-tipo].active{
  background: var(--accent-soft);
  border-color: var(--border-accent);
  color: var(--accent);
}

.search-input{
  width: 100%;
  max-width: 420px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font);
  font-size: .92rem;
  transition: border-color var(--t-fast);
}
.search-input:focus{
  outline: none;
  border-color: var(--border-accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

[data-fav]{
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--muted);
  cursor: pointer;
  transition: color var(--t-fast), transform var(--t-fast);
}
[data-fav]:hover{ color: var(--dorado); transform: scale(1.15); }
[data-fav].is-fav{ color: var(--dorado); }

.ext-icon{
  display: inline-block;
  margin-left: 4px;
  font-size: .75em;
  opacity: .6;
  transition: opacity var(--t-fast);
}
a:hover .ext-icon{ opacity: 1; }

.copied{ color: var(--verde-selva) !important; }
.error{ color: var(--rojo) !important; }

.sidebar[aria-hidden="true"]{ visibility: hidden; }
.sidebar.visible{ visibility: visible; }
.lightbox[aria-hidden="true"]{ visibility: hidden; }
.lightbox.open{ visibility: visible; }

html.js-enabled [data-reveal]{
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
html.js-enabled [data-reveal="left"]{ transform: translateX(-28px); }
html.js-enabled [data-reveal="right"]{ transform: translateX(28px); }
html.js-enabled [data-reveal="zoom"]{ transform: scale(.94); }
html.js-enabled [data-reveal].is-visible{
  opacity: 1;
  transform: translate(0) scale(1);
}

html.js-enabled .hero > *,
html.js-enabled .creditos-hero > *{
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
html.js-enabled .hero.hero-entered > *,
html.js-enabled .creditos-hero.hero-entered > *{
  opacity: 1;
  transform: translateY(0);
}
.hero.hero-entered .grid > *:nth-child(1){ transition-delay: .1s; }
.hero.hero-entered .grid > *:nth-child(2){ transition-delay: .22s; }

html.js-enabled .letters .letter{
  display: inline-block;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}
html.js-enabled .letters.is-visible .letter{ opacity: 1; transform: translateY(0); }

.tl-item.tl-anim{
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}
.tl-item.tl-anim.is-visible{ opacity: 1; transform: translateY(0); }

.scroll-progress{
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  z-index: 200;
  transition: width .08s linear;
  box-shadow: 0 0 12px var(--accent-glow);
  pointer-events: none;
}

.copy-anchor{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 10px;
  width: 26px; height: 26px;
  border-radius: 6px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .9rem;
  opacity: 0;
  transition: opacity .2s, background .2s, color .2s, border-color .2s;
}
h2:hover .copy-anchor,
.copy-anchor:focus-visible{ opacity: 1; }
.copy-anchor:hover{
  color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--border-accent);
}

.back-top{
  position: fixed;
  right: 24px; bottom: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #08202a;
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .25s, transform .25s, background .2s;
  z-index: 90;
}
.back-top.visible{ opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-top:hover{ background: var(--accent-hover); transform: translateY(-2px); }

.ripple{
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.22);
  transform: scale(0);
  animation: rippleAnim .65s ease-out;
  pointer-events: none;
}
@keyframes rippleAnim{
  to{ transform: scale(2.6); opacity: 0; }
}

.tw-caret{
  display: inline-block;
  margin-left: 2px;
  color: var(--accent);
  animation: twBlink 1s steps(2) infinite;
}
@keyframes twBlink{ 50%{ opacity: 0; } }

.term{
  border-bottom: 1px dashed var(--accent);
  cursor: help;
  color: var(--text);
}
.glossary-pop{
  position: absolute;
  max-width: 280px;
  padding: 12px 16px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  font-size: .85rem;
  line-height: 1.5;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  z-index: 120;
}
.glossary-pop.visible{ opacity: 1; }

.section-progress{
  position: absolute;
  left: 0; top: 0;
  width: 3px; height: 100%;
  background: var(--accent);
  transform-origin: top;
  transform: scaleY(0);
  opacity: .5;
  pointer-events: none;
}

.marquee{
  overflow: hidden;
  white-space: nowrap;
  position: relative;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.marquee-inner{
  display: inline-flex;
  gap: 32px;
  animation: marqueeAnim 30s linear infinite;
}
@keyframes marqueeAnim{ to{ transform: translateX(-50%); } }

[data-particles]{
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  opacity: .55;
}

img.lazy{ opacity: 0; transition: opacity .6s ease; }
img.lazy.is-loaded{ opacity: 1; }

html.force-reduced *{
  animation-duration: .01ms !important;
  transition-duration: .01ms !important;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .marquee-inner{ animation: none; }
  .tw-caret{ animation: none; }
  .foot-row .heart{ animation: none; }
}

@media (max-width: 900px){
  .hero{ padding: 48px 0 40px; }
  .hero .grid{ grid-template-columns: 1fr; gap: 32px; }
  .hero .banner-img{ max-height: 220px; }
  section{ padding: 56px 0; }
}

@media (max-width: 640px){
  html{ scroll-padding-top: var(--header-h-mobile); }
  .wrap{ padding: 0 18px; }
  .crumb{ display: none; }
  nav.links{ display: none; }
  .navtoggle{ display: flex; align-items: center; justify-content: center; }
  header.open nav.links{
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
    box-shadow: var(--shadow-md);
  }
  header.open nav.links a{ padding: 12px 24px; border-radius: 0; }
  .hero h1{ font-size: 1.85rem; }
  section{ padding: 48px 0; }
}