/* =========================================================
   UNDERC0DE GUIAS · Hoja de estilos principal
   Identidad: dark hacker + azul profundo/cian electrico
   ========================================================= */

:root {
  --uc-blue: #0f538f;
  --uc-blue-2: #298bd0;
  --uc-cyan: #03a9f4;
  --uc-cyan-2: #65d5ff;
  --uc-bg: #02070c;
  --uc-bg-soft: #06111a;
  --uc-panel: #09141e;
  --uc-panel-2: #0d1b27;
  --uc-panel-3: #102434;
  --uc-text: #eefaff;
  --uc-muted: #a6bdcc;
  --uc-subtle: #6f8999;
  --uc-line: rgba(3, 169, 244, 0.16);
  --uc-line-strong: rgba(3, 169, 244, 0.3);
  --uc-success: #53f3b2;
  --uc-warning: #ffd166;
  --uc-info: #65d5ff;
  --uc-danger: #ff6b8a;
  --uc-gradient: linear-gradient(135deg, var(--uc-blue), var(--uc-cyan));
  --uc-gradient-soft: linear-gradient(135deg, rgba(15, 83, 143, 0.25), rgba(3, 169, 244, 0.14));
  --uc-shadow: 0 22px 70px rgba(0, 0, 0, 0.48), 0 0 45px rgba(3, 169, 244, 0.05);
  --uc-radius-sm: 8px;
  --uc-radius: 14px;
  --uc-radius-lg: 22px;
  --uc-max: 1280px;
  --uc-header: 72px;
  --uc-display: "Oxanium", "Chakra Petch", "Segoe UI", sans-serif;
  --uc-body: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --uc-mono: "JetBrains Mono", "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--uc-header) + 28px); }
body {
  position: relative;
  isolation: isolate;
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 15% 0%, rgba(3, 169, 244, .11), transparent 30rem),
    radial-gradient(circle at 90% 2%, rgba(15, 83, 143, .16), transparent 34rem),
    var(--uc-bg);
  color: var(--uc-text);
  font-family: var(--uc-body);
  line-height: 1.72;
  font-kerning: normal;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  z-index: -1;
  height: min(1050px, 95vh);
  opacity: .17;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(3,169,244,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(3,169,244,.05) 1px, transparent 1px);
  background-size: 48px 48px;
}
body::after { display: none; }

::selection { color: #fff; background: rgba(3, 169, 244, .65); }
img, svg { max-width: 100%; }
a { color: var(--uc-cyan-2); text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { color: #fff; }
button, input { font: inherit; }
button { color: inherit; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 10px 14px;
  border-radius: 8px;
  background: #fff;
  color: #02070c;
  transform: translateY(-150%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

.reading-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 1001;
  width: 100%;
  height: 3px;
  background: var(--uc-gradient);
  box-shadow: 0 0 12px rgba(3, 169, 244, .45);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--uc-header);
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(2, 7, 12, .97);
}
.header-inner {
  width: min(calc(100% - 32px), var(--uc-max));
  min-height: var(--uc-header);
  margin: auto;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #fff;
  font-size: 1.02rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -.02em;
}
.brand img { width: 39px; height: 39px; }
.brand strong {
  background: var(--uc-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}
.header-nav { display: flex; align-items: center; gap: 5px; margin-left: auto; }
.header-nav a {
  color: var(--uc-muted);
  padding: 9px 11px;
  border-radius: 10px;
  text-decoration: none;
  font-size: .9rem;
  font-weight: 650;
}
.header-nav a:hover { color: #fff; background: rgba(255,255,255,.06); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-button, .share-button, .toc-mobile-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 13px;
  border: 1px solid var(--uc-line);
  border-radius: 12px;
  background: rgba(255,255,255,.045);
  color: var(--uc-text);
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .2s;
}
.icon-button:hover, .share-button:hover, .toc-mobile-button:hover {
  border-color: rgba(3,169,244,.55);
  background: rgba(3,169,244,.09);
  transform: translateY(-1px);
}
.icon-button svg, .share-button svg, .toc-mobile-button svg { width: 18px; height: 18px; }
.mobile-only { display: none; }

.guide-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--uc-line);
}
.guide-hero::after {
  content: "";
  position: absolute;
  width: 580px;
  height: 580px;
  right: -160px;
  top: -260px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 50%;
  box-shadow: 0 0 0 54px rgba(15,83,143,.025);
}
.hero-inner {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 32px), var(--uc-max));
  margin: auto;
  padding: 56px 0 48px;
}
.breadcrumbs { margin: 0 0 28px; }
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--uc-subtle);
  font-size: .87rem;
}
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: 8px; color: #36515f; }
.breadcrumbs a { color: var(--uc-muted); text-decoration: none; }
.breadcrumbs a:hover { color: #fff; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  align-items: end;
  gap: 56px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 7px 11px;
  border: 1px solid rgba(3,169,244,.3);
  border-radius: 999px;
  background: rgba(3,169,244,.075);
  color: #7addff;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--uc-cyan); box-shadow: 0 0 14px var(--uc-cyan); }
.guide-hero h1 {
  max-width: 900px;
  margin: 0;
  font-family: var(--uc-display);
  font-size: clamp(2.35rem, 5.8vw, 5rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -.035em;
  font-feature-settings: "kern" 1;
}
.gradient-text {
  background: var(--uc-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}
.hero-lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: #b6cad6;
  font-size: clamp(1.04rem, 2vw, 1.22rem);
  line-height: 1.65;
}
.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 28px;
  color: var(--uc-muted);
  font-size: .87rem;
}
.meta-item { display: inline-flex; align-items: center; gap: 7px; }
.meta-item svg { width: 17px; height: 17px; color: var(--uc-cyan-2); }
.hero-card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--uc-line-strong);
  border-radius: var(--uc-radius-lg);
  background: linear-gradient(145deg, rgba(255,255,255,.075), rgba(255,255,255,.025));
  box-shadow: var(--uc-shadow);
}
.hero-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(15,83,143,.2), transparent 52%);
  pointer-events: none;
}
.hero-card-label { color: var(--uc-subtle); font-size: .75rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.hero-card-title { margin: 8px 0 16px; font-family: var(--uc-display); font-size: 1.28rem; font-weight: 650; line-height: 1.25; letter-spacing: -.015em; }
.hero-card-list { display: grid; gap: 11px; margin: 0; padding: 0; list-style: none; }
.hero-card-list li { display: flex; align-items: flex-start; gap: 10px; color: var(--uc-muted); font-size: .91rem; }
.hero-card-list svg { flex: 0 0 auto; width: 18px; margin-top: 3px; color: var(--uc-success); }

.guide-shell {
  width: min(calc(100% - 32px), var(--uc-max));
  margin: 0 auto;
  padding: 54px 0 100px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 64px;
  align-items: start;
}
.guide-content { min-width: 0; }
.guide-content > section {
  content-visibility: auto;
  contain-intrinsic-size: auto 720px;
}
.related-section {
  content-visibility: auto;
  contain-intrinsic-size: auto 420px;
}
.guide-content > :first-child { margin-top: 0; }
.guide-content h2, .guide-content h3, .guide-content h4 { color: #fff; font-family: var(--uc-display); font-weight: 700; line-height: 1.18; letter-spacing: -.018em; scroll-margin-top: calc(var(--uc-header) + 28px); }
.guide-content h2 { margin: 72px 0 20px; padding-top: 3px; font-size: clamp(1.75rem, 4vw, 2.5rem); }
.guide-content h3 { margin: 40px 0 14px; font-size: clamp(1.3rem, 2.8vw, 1.7rem); }
.guide-content h4 { margin: 28px 0 10px; font-size: 1.13rem; font-weight: 650; }
.guide-content p { margin: 0 0 22px; color: #c5d7e1; font-size: 1.02rem; }
.guide-content strong { color: #fff; }
.guide-content ul, .guide-content ol { margin: 0 0 24px; padding-left: 1.4rem; color: #c5d7e1; }
.guide-content li { margin: 9px 0; padding-left: 4px; }
.guide-content li::marker { color: var(--uc-cyan); font-weight: 800; }
.guide-content hr { border: 0; border-top: 1px solid var(--uc-line); margin: 64px 0; }
.heading-anchor { color: inherit; text-decoration: none; }
.heading-anchor:hover { color: #fff; }
.heading-anchor:hover::after { content: " #"; color: var(--uc-cyan); font-weight: 500; }

.answer-first {
  position: relative;
  margin-bottom: 32px;
  padding: 25px 26px 25px 28px;
  border: 1px solid rgba(15,83,143,.3);
  border-radius: var(--uc-radius);
  background: linear-gradient(135deg, rgba(15,83,143,.11), rgba(3,169,244,.07));
}
.answer-first::before { content: ""; position: absolute; inset: 18px auto 18px 0; width: 3px; border-radius: 5px; background: var(--uc-gradient); }
.answer-first-title { display: block; margin-bottom: 7px; color: #fff; font-size: .82rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.answer-first p { margin: 0; }

.key-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 38px;
}
.key-point {
  padding: 20px;
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
  background: var(--uc-panel);
}
.key-point-number { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-bottom: 14px; border-radius: 10px; background: var(--uc-gradient-soft); color: #7addff; font-size: .82rem; font-weight: 900; }
.key-point strong { display: block; margin-bottom: 5px; font-family: var(--uc-display); font-weight: 650; letter-spacing: -.01em; }
.key-point p { margin: 0; color: var(--uc-muted); font-size: .9rem; line-height: 1.55; }

.inline-toc {
  display: none;
  margin: 28px 0;
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
  background: var(--uc-panel);
}
.inline-toc summary { cursor: pointer; padding: 16px 18px; color: #fff; font-weight: 750; }
.inline-toc ol { margin: 0; padding: 0 18px 18px 38px; font-size: .92rem; }
.inline-toc a { color: var(--uc-muted); text-decoration: none; }

.guide-figure { margin: 34px 0; }
.figure-frame {
  overflow: hidden;
  padding: 10px;
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius-lg);
  background: rgba(255,255,255,.025);
  box-shadow: 0 22px 55px rgba(0,0,0,.24);
}
.figure-frame img { display: block; width: 100%; border-radius: calc(var(--uc-radius-lg) - 8px); }
.guide-figure figcaption { margin-top: 11px; color: var(--uc-subtle); font-size: .83rem; text-align: center; }

.callout {
  position: relative;
  margin: 30px 0;
  padding: 23px 24px 23px 66px;
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
  background: var(--uc-panel);
}
.callout-icon { position: absolute; left: 22px; top: 23px; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 9px; }
.callout-icon svg { width: 17px; height: 17px; }
.callout strong { display: block; margin-bottom: 4px; }
.callout p { margin: 0; color: var(--uc-muted); font-size: .95rem; }
.callout.tip { border-color: rgba(94,230,168,.22); }
.callout.tip .callout-icon { color: var(--uc-success); background: rgba(94,230,168,.12); }
.callout.warning { border-color: rgba(255,204,102,.25); }
.callout.warning .callout-icon { color: var(--uc-warning); background: rgba(255,204,102,.12); }
.callout.info { border-color: rgba(103,215,255,.22); }
.callout.info .callout-icon { color: var(--uc-info); background: rgba(103,215,255,.11); }

.comparison-table-wrap { margin: 30px 0; overflow-x: auto; border: 1px solid var(--uc-line); border-radius: var(--uc-radius); }
.comparison-table { width: 100%; border-collapse: collapse; min-width: 670px; background: var(--uc-panel); }
.comparison-table th, .comparison-table td { padding: 15px 17px; border-bottom: 1px solid var(--uc-line); text-align: left; vertical-align: top; }
.comparison-table th { color: #fff; background: rgba(255,255,255,.04); font-family: var(--uc-mono); font-size: .78rem; font-weight: 650; letter-spacing: .04em; text-transform: uppercase; }
.comparison-table td { color: #bdd1dc; font-size: .92rem; }
.comparison-table tr:last-child td { border-bottom: 0; }

.code-block {
  position: relative;
  margin: 30px 0;
  overflow: hidden;
  border: 1px solid var(--uc-line-strong);
  border-radius: var(--uc-radius);
  background: #02090f;
  box-shadow: 0 18px 40px rgba(0,0,0,.24);
}
.code-header { display: flex; align-items: center; justify-content: space-between; min-height: 46px; padding: 0 12px 0 17px; border-bottom: 1px solid var(--uc-line); background: #07131c; }
.code-language { color: var(--uc-subtle); font-size: .78rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.copy-code { display: inline-flex; align-items: center; gap: 7px; padding: 6px 9px; border: 0; border-radius: 8px; background: transparent; color: var(--uc-muted); font-size: .8rem; cursor: pointer; }
.copy-code:hover { color: #fff; background: rgba(255,255,255,.06); }
.copy-code svg { width: 15px; height: 15px; }
.code-block pre { margin: 0; padding: 22px; overflow-x: auto; color: #d9f3ff; font: 500 .9rem/1.75 var(--uc-mono); tab-size: 2; }
.code-block code { font: inherit; }
.token-keyword { color: #57c7ff; }
.token-string { color: #72e0ff; }
.token-comment { color: #68818e; }
.token-function { color: #03a9f4; }

.steps { display: grid; gap: 15px; margin: 28px 0; padding: 0; list-style: none; counter-reset: guide-step; }
.steps li { position: relative; margin: 0; min-height: 74px; padding: 18px 20px 18px 72px; border: 1px solid var(--uc-line); border-radius: var(--uc-radius); background: var(--uc-panel); counter-increment: guide-step; }
.steps li::before { content: counter(guide-step); position: absolute; left: 20px; top: 19px; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 11px; background: var(--uc-gradient); color: #fff; font-size: .86rem; font-weight: 900; box-shadow: 0 8px 20px rgba(3,169,244,.2); }
.steps strong { display: block; margin-bottom: 2px; font-family: var(--uc-display); font-weight: 650; letter-spacing: -.01em; }
.steps span { color: var(--uc-muted); font-size: .93rem; }

.checklist { display: grid; gap: 11px; margin: 28px 0; padding: 0; list-style: none; }
.checklist li { position: relative; margin: 0; padding: 13px 16px 13px 49px; border: 1px solid var(--uc-line); border-radius: 12px; background: rgba(255,255,255,.025); }
.checklist li::before { content: "✓"; position: absolute; left: 16px; top: 13px; display: grid; place-items: center; width: 23px; height: 23px; border-radius: 8px; background: rgba(94,230,168,.12); color: var(--uc-success); font-size: .78rem; font-weight: 900; }

.faq-list { display: grid; gap: 12px; margin-top: 28px; }
.faq-item { border: 1px solid var(--uc-line); border-radius: var(--uc-radius); background: var(--uc-panel); }
.faq-item summary { position: relative; cursor: pointer; padding: 19px 52px 19px 20px; color: #fff; font-family: var(--uc-display); font-weight: 650; letter-spacing: -.01em; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 19px; top: 50%; transform: translateY(-50%); color: var(--uc-cyan); font-size: 1.45rem; font-weight: 400; }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 20px 19px; }
.faq-answer p { margin: 0; color: var(--uc-muted); font-size: .95rem; }

.source-card {
  margin-top: 60px;
  padding: 26px;
  border: 1px solid rgba(3,169,244,.22);
  border-radius: var(--uc-radius-lg);
  background: linear-gradient(135deg, rgba(3,169,244,.08), rgba(15,83,143,.07));
}
.source-card-label { color: #7addff; font-size: .76rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.source-card h2 { margin: 8px 0 9px; padding: 0; font-family: var(--uc-display); font-size: 1.45rem; font-weight: 700; letter-spacing: -.015em; }
.source-card p { margin: 0 0 17px; color: var(--uc-muted); font-size: .94rem; }
.source-card a { display: inline-flex; align-items: center; gap: 8px; color: #fff; font-weight: 750; text-decoration: none; }
.source-card a:hover { color: var(--uc-cyan-2); }

.guide-author {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--uc-line);
}
.author-avatar { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 16px; background: var(--uc-gradient); color: #fff; font-weight: 900; }
.author-name { color: #fff; font-weight: 800; }
.author-role { color: var(--uc-subtle); font-size: .86rem; }

.guide-sidebar { position: sticky; top: calc(var(--uc-header) + 26px); }
.sidebar-card { padding: 20px; border: 1px solid var(--uc-line); border-radius: var(--uc-radius); background: rgba(9,20,30,.97); }
.sidebar-card + .sidebar-card { margin-top: 14px; }
.sidebar-title { margin: 0 0 13px; color: #fff; font-size: .78rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.toc-list { margin: 0; padding: 0; list-style: none; }
.toc-list li { margin: 2px 0; }
.toc-list a { display: block; padding: 7px 10px; border-left: 2px solid transparent; border-radius: 0 8px 8px 0; color: var(--uc-subtle); font-size: .86rem; line-height: 1.35; text-decoration: none; transition: all .2s; }
.toc-list a:hover { color: #fff; background: rgba(255,255,255,.04); }
.toc-list a.is-active { border-color: var(--uc-cyan); background: linear-gradient(90deg, rgba(3,169,244,.12), transparent); color: #fff; }
.sidebar-note { margin: 0; color: var(--uc-muted); font-size: .86rem; }
.sidebar-links { display: grid; gap: 8px; }
.sidebar-links a { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 11px; border: 1px solid transparent; border-radius: 10px; color: var(--uc-muted); font-size: .86rem; text-decoration: none; }
.sidebar-links a:hover { border-color: var(--uc-line); color: #fff; background: rgba(255,255,255,.035); }
.sidebar-links svg { width: 16px; height: 16px; }

.related-section { padding: 72px 0 82px; border-top: 1px solid var(--uc-line); background: var(--uc-bg-soft); }
.related-inner { width: min(calc(100% - 32px), var(--uc-max)); margin: auto; }
.section-kicker { color: var(--uc-cyan-2); font-size: .78rem; font-weight: 850; letter-spacing: .09em; text-transform: uppercase; }
.related-header { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 25px; }
.related-header h2 { margin: 6px 0 0; font-family: var(--uc-display); font-size: clamp(1.8rem, 3.8vw, 2.6rem); font-weight: 700; line-height: 1.15; letter-spacing: -.02em; }
.related-header > a { flex: 0 0 auto; color: var(--uc-muted); font-size: .9rem; font-weight: 700; text-decoration: none; }
.related-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.related-card { position: relative; overflow: hidden; display: flex; flex-direction: column; min-height: 270px; padding: 24px; border: 1px solid var(--uc-line); border-radius: var(--uc-radius-lg); background: var(--uc-panel); text-decoration: none; transition: transform .25s, border-color .25s; }
.related-card::after { content: ""; position: absolute; width: 170px; height: 170px; right: -70px; bottom: -90px; border-radius: 50%; background: var(--uc-gradient); opacity: .09; }
.related-card:hover { transform: translateY(-5px); border-color: rgba(3,169,244,.4); }
.related-card-tag { display: inline-flex; padding: 6px 9px; border-radius: 999px; background: rgba(15,83,143,.12); color: #8ddfff; font-size: .72rem; font-weight: 850; letter-spacing: .05em; text-transform: uppercase; }
.related-card h3 { margin: 44px 0 8px; color: #fff; font-family: var(--uc-display); font-size: 1.3rem; font-weight: 650; line-height: 1.2; letter-spacing: -.012em; }
.related-card p { margin: 0; color: var(--uc-muted); font-size: .88rem; line-height: 1.65; }
.related-card-link { display: inline-flex; align-items: center; margin-top: auto; padding-top: 22px; color: var(--uc-cyan-2); font-size: .84rem; font-weight: 850; letter-spacing: .02em; }

.site-footer { padding: 35px 0; border-top: 1px solid var(--uc-line); background: #010509; }
.footer-inner { width: min(calc(100% - 32px), var(--uc-max)); margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-copy { color: var(--uc-subtle); font-size: .82rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a { color: var(--uc-muted); font-size: .82rem; text-decoration: none; }
.footer-links a:hover { color: #fff; }

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 80;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--uc-line-strong);
  border-radius: 14px;
  background: rgba(9,20,30,.88);
  color: #fff;
  box-shadow: 0 12px 35px rgba(0,0,0,.3);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .2s, transform .2s, border-color .2s;
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { border-color: var(--uc-cyan); }
.back-to-top svg { width: 19px; height: 19px; }

.toast {
  position: fixed;
  z-index: 300;
  left: 50%;
  bottom: 24px;
  padding: 11px 15px;
  border: 1px solid var(--uc-line-strong);
  border-radius: 12px;
  background: #0d1b27;
  color: #fff;
  box-shadow: var(--uc-shadow);
  font-size: .88rem;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity .2s, transform .2s;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }


/* =========================================================
   DETALLES HACKER / TERMINAL
   ========================================================= */
.system-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  margin: 0 0 20px;
  color: var(--uc-subtle);
  font: 700 .68rem/1.4 var(--uc-mono);
  letter-spacing: .09em;
  text-transform: uppercase;
}
.system-status span { display: inline-flex; align-items: center; gap: 7px; }
.system-status .status-online { color: var(--uc-cyan-2); }
.system-status .status-online::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--uc-cyan);
  box-shadow: 0 0 7px rgba(3,169,244,.6);
}
.system-clock { color: #d7f5ff; }

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(3,169,244,.65), transparent);
  box-shadow: 0 0 14px rgba(3,169,244,.35);
}
.brand { font-family: var(--uc-display); text-transform: uppercase; letter-spacing: .025em; }
.brand strong { text-shadow: 0 0 18px rgba(3,169,244,.28); }
.header-nav a,
.guide-meta,
.breadcrumbs,
.share-button,
.icon-button,
.toc-mobile-button,
.sidebar-title,
.toc-list a,
.footer-copy,
.footer-links a {
  font-family: var(--uc-mono);
}
.header-nav a, .toc-list a { letter-spacing: .015em; }

.guide-hero::before {
  content: "UNDERC0DE://KNOWLEDGE_BASE";
  position: absolute;
  right: max(24px, calc((100vw - var(--uc-max)) / 2));
  bottom: 18px;
  z-index: 1;
  color: rgba(101,213,255,.16);
  font: 800 .7rem/1 var(--uc-mono);
  letter-spacing: .15em;
  pointer-events: none;
}
.guide-hero h1 { text-shadow: none; }
.eyebrow,
.hero-card-label,
.answer-first-title,
.source-card-label,
.sidebar-title,
.section-kicker,
.code-language,
.related-card-tag {
  font-family: var(--uc-mono);
}
.eyebrow::after {
  content: "_";
  color: var(--uc-cyan-2);
  opacity: .75;
}

.guide-content h2::before {
  content: "//";
  margin-right: .45em;
  color: var(--uc-cyan);
  font-family: var(--uc-mono);
  font-size: .72em;
  letter-spacing: -.12em;
  text-shadow: none;
}
.guide-content h3::before {
  content: ">";
  margin-right: .45em;
  color: var(--uc-blue-2);
  font-family: var(--uc-mono);
}
.sidebar-title::before,
.section-kicker::before,
.hero-card-label::before,
.answer-first-title::before,
.source-card-label::before {
  content: "> ";
  color: var(--uc-cyan);
}

.hero-card,
.sidebar-card,
.related-card,
.answer-first,
.source-card,
.key-point,
.steps li,
.faq-item,
.callout,
.code-block {
  background-image: linear-gradient(135deg, rgba(3,169,244,.035), transparent 38%);
}
.hero-card::after,
.sidebar-card::after,
.related-card::before {
  content: "";
  position: absolute;
  pointer-events: none;
  width: 18px;
  height: 18px;
  border-color: rgba(3,169,244,.65);
}
.hero-card::after { right: 10px; bottom: 10px; border-right: 1px solid; border-bottom: 1px solid; }
.sidebar-card { position: relative; overflow: hidden; }
.sidebar-card::after { right: 8px; top: 8px; border-right: 1px solid; border-top: 1px solid; opacity: .55; }
.related-card::before { left: 10px; top: 10px; border-left: 1px solid; border-top: 1px solid; opacity: .55; }

.code-block { border-color: rgba(3,169,244,.25); }
.code-header::before {
  content: "●  ●  ●";
  margin-right: 12px;
  color: var(--uc-cyan);
  font: 700 .6rem/1 var(--uc-mono);
  letter-spacing: .15em;
  opacity: .75;
}
.code-language { margin-right: auto; }
.code-block pre { text-shadow: none; }

.icon-button:focus-visible,
.share-button:focus-visible,
.toc-mobile-button:focus-visible,
a:focus-visible,
summary:focus-visible,
button:focus-visible {
  outline: 2px solid var(--uc-cyan);
  outline-offset: 3px;
}

@media (max-width: 1050px) {
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-card { max-width: 650px; }
  .guide-shell { grid-template-columns: minmax(0, 1fr) 260px; gap: 38px; }
  .header-nav { display: none; }
  .key-points { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  :root { --uc-header: 64px; }
  body::before { display: none; }
  .guide-hero::after { display: none; }
  .header-inner { width: min(calc(100% - 24px), var(--uc-max)); }
  .brand span { display: none; }
  .header-actions .share-label { display: none; }
  .mobile-only { display: inline-flex; }
  .guide-shell { display: block; width: min(calc(100% - 28px), 760px); padding-top: 34px; }
  .guide-sidebar { display: none; }
  .inline-toc { display: block; }
  .hero-inner { width: min(calc(100% - 28px), 760px); padding-top: 34px; }
  .guide-hero h1 { font-size: clamp(2.35rem, 10.5vw, 4rem); }
  .related-grid { grid-template-columns: 1fr; }
  .related-card { min-height: 190px; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 560px) {
  .system-status { gap: 6px 12px; font-size: .61rem; }
  .guide-hero::before { display: none; }
  body { line-height: 1.65; }
  .header-actions { gap: 5px; }
  .icon-button, .share-button, .toc-mobile-button { min-width: 40px; min-height: 40px; padding: 0 10px; }
  .guide-meta { gap: 9px 15px; }
  .hero-card { padding: 20px; border-radius: 22px; }
  .guide-content h2 { margin-top: 58px; }
  .guide-content p { font-size: .98rem; }
  .answer-first, .source-card { padding: 21px; }
  .callout { padding: 59px 19px 20px; }
  .callout-icon { top: 19px; left: 19px; }
  .steps li { padding: 67px 17px 17px; }
  .steps li::before { top: 17px; left: 17px; }
  .related-header { align-items: flex-start; flex-direction: column; }
  .back-to-top { right: 14px; bottom: 14px; }
}


@media (hover: none), (pointer: coarse) {
  .icon-button:hover,
  .share-button:hover,
  .toc-mobile-button:hover,
  .related-card:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media print {
  :root { color-scheme: light; }
  body { background: #fff; color: #111; font-family: Arial, sans-serif; }
  body::before, body::after, .site-header, .reading-progress, .guide-sidebar, .related-section, .site-footer, .back-to-top, .toast, .share-button { display: none !important; }
  .guide-hero { border: 0; }
  .hero-inner, .guide-shell { width: 100%; padding: 24px 0; display: block; }
  .hero-grid { display: block; }
  .hero-card { display: none; }
  .guide-hero h1, .guide-content h2, .guide-content h3, .guide-content h4, .guide-content strong { color: #111; }
  .gradient-text { color: #111; background: none; }
  .guide-content h2::before, .guide-content h3::before { display: none; }
  .hero-lead, .guide-content p, .guide-content li, .callout p { color: #333; }
  .answer-first, .callout, .key-point, .steps li, .faq-item, .source-card { break-inside: avoid; border: 1px solid #bbb; background: #fff; box-shadow: none; }
  a { color: #111; text-decoration: underline; }
}


/* =========================================================
   Portal e índice de guías
   ========================================================= */
:root { --uc-index-max: 1180px; }
.header-cta {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 42px; padding: 0 17px; border: 1px solid rgba(3,169,244,.55);
  border-radius: 10px; background: #03a9f4; color: #001018; font-family: var(--uc-mono);
  font-size: .78rem; font-weight: 800; text-decoration: none; box-shadow: 0 8px 24px rgba(3,169,244,.14);
}
.header-cta:hover { background: #35baff; color: #001018; }
.footer-brand { margin-bottom: 12px; }

.index-hero {
  border-bottom: 1px solid var(--uc-line);
  background:
    linear-gradient(rgba(3,169,244,.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(3,169,244,.032) 1px, transparent 1px),
    radial-gradient(circle at 85% 18%, rgba(15,83,143,.18), transparent 34%),
    var(--uc-bg);
  background-size: 40px 40px, 40px 40px, auto, auto;
}
.index-hero-inner { width: min(calc(100% - 32px), var(--uc-index-max)); margin: 0 auto; padding: 58px 0 48px; }
.index-hero-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr); gap: 56px; align-items: center; }
.index-kicker { display: inline-flex; gap: 9px; align-items: center; color: #7addff; font-family: var(--uc-mono); font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.index-kicker::before { content: ">_"; color: var(--uc-cyan); }
.index-hero h1 { max-width: 850px; margin: 13px 0 18px; font-family: var(--uc-display); font-size: clamp(2.55rem, 6vw, 5.35rem); line-height: .98; letter-spacing: -.045em; }
.index-hero p { max-width: 760px; margin: 0; color: #b9cdd8; font-size: clamp(1.02rem, 1.8vw, 1.18rem); line-height: 1.72; }
.index-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.primary-button, .secondary-button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 18px; border-radius: 10px; font-family: var(--uc-mono); font-size: .82rem; font-weight: 800; text-decoration: none; }
.primary-button { background: var(--uc-cyan); color: #001018; border: 1px solid var(--uc-cyan); }
.secondary-button { background: rgba(255,255,255,.025); color: #d8edf7; border: 1px solid var(--uc-line-strong); }
.primary-button:hover { color: #001018; background: #35baff; }
.secondary-button:hover { color: #fff; border-color: rgba(3,169,244,.6); }
.index-terminal { border: 1px solid var(--uc-line-strong); border-radius: 14px; overflow: hidden; background: #070d13; box-shadow: var(--uc-shadow); }
.index-terminal-head { display: flex; align-items: center; gap: 7px; min-height: 38px; padding: 0 14px; border-bottom: 1px solid var(--uc-line); color: var(--uc-subtle); font-family: var(--uc-mono); font-size: .7rem; }
.index-terminal-head i { width: 9px; height: 9px; border-radius: 50%; background: #ff625a; }
.index-terminal-head i:nth-child(2){background:#ffbd2e}.index-terminal-head i:nth-child(3){background:#28c840}
.index-terminal pre { margin: 0; padding: 22px; white-space: pre-wrap; color: #a8bcc8; font: 500 .8rem/1.9 var(--uc-mono); }
.index-terminal .cmd { color: #49e6a1; }.index-terminal .key { color: #03a9f4; }.index-terminal .value { color: #fff; }

.index-main { width: min(calc(100% - 32px), var(--uc-index-max)); margin: 0 auto; padding: 48px 0 92px; }
.index-section { margin-top: 62px; }
.index-section:first-child { margin-top: 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 22px; }
.section-head h2 { margin: 0; font-family: var(--uc-display); font-size: clamp(1.65rem, 3vw, 2.25rem); letter-spacing: -.025em; }
.section-head p { max-width: 600px; margin: 8px 0 0; color: var(--uc-muted); }
.section-link { color: #7addff; font-family: var(--uc-mono); font-size: .78rem; text-decoration: none; }

.search-panel { padding: 22px; border: 1px solid var(--uc-line-strong); border-radius: 16px; background: #070d13; }
.search-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; align-items: center; }
.search-box { position: relative; }
.search-box svg { position: absolute; left: 16px; top: 50%; width: 19px; height: 19px; color: #6c8797; transform: translateY(-50%); pointer-events: none; }
.search-input { width: 100%; min-height: 50px; padding: 0 44px 0 48px; border: 1px solid var(--uc-line-strong); border-radius: 10px; outline: 0; background: #050a0f; color: #fff; font: 500 .96rem var(--uc-body); }
.search-input::placeholder { color: #66808f; }
.search-input:focus { border-color: var(--uc-cyan); box-shadow: 0 0 0 3px rgba(3,169,244,.12); }
.search-shortcut { position: absolute; right: 13px; top: 50%; transform: translateY(-50%); border: 1px solid var(--uc-line-strong); border-bottom-color: #38515f; border-radius: 5px; padding: 2px 7px; color: #78909c; background: #0b1218; font: 600 .7rem var(--uc-mono); }
.search-count { min-width: 135px; color: #91a9b7; font: 600 .78rem var(--uc-mono); text-align: right; }
.filter-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.filter-button { min-height: 36px; padding: 0 13px; border: 1px solid var(--uc-line-strong); border-radius: 999px; background: transparent; color: #91a9b7; font: 700 .72rem var(--uc-mono); cursor: pointer; }
.filter-button:hover, .filter-button.is-active { border-color: rgba(3,169,244,.62); background: rgba(3,169,244,.1); color: #8cdeff; }

.category-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; }
.category-card { min-width: 0; padding: 20px; border: 1px solid var(--uc-line); border-radius: 14px; background: #070c12; text-decoration: none; transition: border-color .16s ease, transform .16s ease; }
.category-card:hover { transform: translateY(-2px); border-color: rgba(3,169,244,.48); }
.category-icon { display: inline-grid; place-items: center; width: 42px; height: 42px; border: 1px solid rgba(3,169,244,.38); border-radius: 10px; color: #75d8ff; background: rgba(3,169,244,.08); font: 800 .72rem var(--uc-mono); }
.category-card h3 { margin: 16px 0 8px; color: #fff; font-family: var(--uc-display); font-size: 1.1rem; }
.category-card p { min-height: 66px; margin: 0; color: #8fa8b6; font-size: .87rem; line-height: 1.58; }
.category-meta { display: flex; justify-content: space-between; gap: 8px; margin-top: 16px; color: #63808f; font: 600 .68rem var(--uc-mono); text-transform: uppercase; }
.category-card.is-empty { opacity: .7; }

.guide-index-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.guide-index-card { display: flex; flex-direction: column; min-width: 0; min-height: 100%; border: 1px solid var(--uc-line); border-radius: 15px; overflow: hidden; background: #070c12; }
.guide-index-card[hidden] { display: none !important; }
.guide-card-top { position: relative; min-height: 148px; padding: 22px; border-bottom: 1px solid var(--uc-line); background: radial-gradient(circle at 85% 10%, color-mix(in srgb, var(--card-accent) 18%, transparent), transparent 48%), #081018; }
.guide-card-code { color: var(--card-accent); font: 800 .72rem var(--uc-mono); letter-spacing: .08em; }
.guide-card-number { position: absolute; right: 18px; bottom: 2px; color: rgba(255,255,255,.035); font: 800 5rem/1 var(--uc-display); }
.guide-card-body { display: flex; flex-direction: column; flex: 1; padding: 22px; }
.guide-card-category { color: var(--card-accent); font: 700 .7rem var(--uc-mono); letter-spacing: .07em; text-transform: uppercase; }
.guide-index-card h3 { margin: 10px 0 11px; font-family: var(--uc-display); font-size: 1.3rem; line-height: 1.25; letter-spacing: -.018em; }
.guide-index-card h3 a { color: #fff; text-decoration: none; }
.guide-index-card p { margin: 0 0 20px; color: #91a9b7; font-size: .91rem; line-height: 1.62; }
.guide-card-meta { display: flex; flex-wrap: wrap; gap: 8px 14px; margin-top: auto; padding-top: 16px; border-top: 1px solid var(--uc-line); color: #6f8998; font: 600 .68rem var(--uc-mono); }
.guide-card-link { display: inline-flex; align-items: center; gap: 7px; margin-top: 18px; color: #83ddff; font: 800 .76rem var(--uc-mono); text-decoration: none; }
.guide-card-link:hover { color: #fff; }
.empty-results { display: none; padding: 40px 22px; border: 1px dashed var(--uc-line-strong); border-radius: 14px; color: #8ca4b1; text-align: center; }
.empty-results.is-visible { display: block; }

.about-guides { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.about-panel { padding: 25px; border: 1px solid var(--uc-line); border-radius: 14px; background: #070c12; }
.about-panel h3 { margin: 0 0 12px; font-family: var(--uc-display); font-size: 1.25rem; }
.about-panel p { margin: 0; color: #91a9b7; line-height: 1.7; }
.about-panel ul { margin: 15px 0 0; padding-left: 1.15rem; color: #a5bac6; }
.about-panel li { margin: 8px 0; }
.about-panel li::marker { color: var(--uc-cyan); }

.category-hero { border-bottom: 1px solid var(--uc-line); background: radial-gradient(circle at 85% 0%, rgba(15,83,143,.16), transparent 36%), var(--uc-bg); }
.category-hero-inner { width: min(calc(100% - 32px), var(--uc-index-max)); margin: 0 auto; padding: 46px 0 42px; }
.category-hero h1 { max-width: 860px; margin: 16px 0 14px; font-family: var(--uc-display); font-size: clamp(2.3rem, 5vw, 4.35rem); line-height: 1.04; letter-spacing: -.04em; }
.category-hero p { max-width: 760px; color: #aac0cc; font-size: 1.08rem; line-height: 1.7; }
.category-summary { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.category-pill { padding: 7px 11px; border: 1px solid var(--uc-line-strong); border-radius: 999px; color: #8da8b7; font: 700 .7rem var(--uc-mono); }

.pillar-note { margin-bottom: 34px; padding: 22px; border-left: 3px solid var(--uc-cyan); border-radius: 0 12px 12px 0; background: rgba(3,169,244,.055); }
.pillar-note strong { color: #fff; }

@media (max-width: 980px) {
  .index-hero-grid { grid-template-columns: 1fr; }
  .index-terminal { max-width: 650px; }
  .category-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .guide-index-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 720px) {
  .header-cta { display: none; }
  .index-hero-inner { padding: 40px 0 34px; }
  .index-hero h1 { font-size: clamp(2.25rem, 13vw, 3.7rem); }
  .index-terminal { display: none; }
  .search-row { grid-template-columns: 1fr; }
  .search-count { text-align: left; }
  .category-grid, .guide-index-grid, .about-guides { grid-template-columns: 1fr; }
  .category-card p { min-height: 0; }
  .section-head { align-items: start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  .category-card { transition: none; }
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}


/* =========================================================
   Navegación móvil y compatibilidad de despliegue
   ========================================================= */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--uc-line-strong);
  border-radius: 10px;
  background: rgba(255,255,255,.035);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  border-radius: 999px;
  background: #bcecff;
  transition: transform .16s ease, opacity .16s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.mobile-nav { display: none; }

/* Fallback para navegadores sin color-mix(). */
.guide-card-top { background-color: #081018; }

/* Evita saltos de diseño mientras cargan las fuentes web. */
.site-header, .index-hero, .category-hero, .guide-hero { contain: layout paint; }

@media (max-width: 1050px) {
  .nav-toggle { display: inline-block; }
  .header-actions { margin-left: auto; }
  .mobile-nav:not([hidden]) {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 6px;
    width: min(calc(100% - 24px), var(--uc-max));
    margin: 0 auto 12px;
    padding: 10px;
    border: 1px solid var(--uc-line);
    border-radius: 12px;
    background: #050b11;
  }
  .mobile-nav a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 8px 10px;
    border-radius: 8px;
    color: var(--uc-muted);
    font: 700 .76rem var(--uc-mono);
    text-decoration: none;
  }
  .mobile-nav a:hover,
  .mobile-nav a[aria-current="page"] { color: #fff; background: rgba(3,169,244,.1); }
}

@media (max-width: 620px) {
  .mobile-nav:not([hidden]) { grid-template-columns: 1fr 1fr; }
  .mobile-nav a:last-child { grid-column: 1 / -1; }
  .index-main, .index-hero-inner, .category-hero-inner { width: min(calc(100% - 24px), var(--uc-index-max)); }
  .search-panel { padding: 16px; }
  .guide-card-top { min-height: 116px; }
}