#neural-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
}

main { position: relative; z-index: 1; }

section {
  padding: var(--section-pad) 0;
  position: relative;
  /* al saltar a un ancla, el contenido queda 1 espacio por debajo del header, sea cual sea el padding */
  scroll-margin-top: calc(var(--header-h) + var(--space-4) - var(--section-pad));
}
.skills-section { --section-pad: var(--space-7); }

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-7);
}
.section-eyebrow {
  font-family: var(--font-mono);
  font-weight: 400;
  line-height: var(--leading-normal);
  font-size: var(--step--1);
  color: var(--primary-2);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.section-eyebrow::before {
  content: '';
  width: 24px; height: 1px;
  background: var(--primary-2);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-8);
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: var(--step--1);
  margin-bottom: var(--space-4);
}
.hero h1 {
  margin-bottom: var(--space-5);
}
.hero h1 .grad {
  background: var(--gradient-brand);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-shift 6s var(--ease-in-out) infinite;
}
.hero-lead {
  font-size: var(--step-1);
  color: var(--text-secondary);
  max-width: 46ch;
  margin-bottom: var(--space-6);
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}
.hero-cta { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }

/* 3D simulator visual */
.hero-3d {
  perspective: 1200px;
  aspect-ratio: 1/1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sim-stage {
  position: relative;
  width: min(360px, 80%);
  aspect-ratio: 1/1;
  transform-style: preserve-3d;
  transition: transform var(--dur-fast) var(--ease-out);
  animation: float-y 6s var(--ease-in-out) infinite;
}
.sim-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  transform-style: preserve-3d;
}
.sim-ring::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  border: 1px dashed var(--primary-2);
  opacity: 0.5;
}
.sim-ring.r1 { transform: rotateX(70deg) rotateZ(0deg); }
.sim-ring.r2 { transform: rotateX(70deg) rotateZ(60deg); inset: 8%; }
.sim-ring.r3 { transform: rotateX(70deg) rotateZ(120deg); inset: 16%; }
.sim-core {
  position: absolute;
  inset: 34%;
  border-radius: 50%;
  background: var(--gradient-brand);
  box-shadow: var(--glow-primary), var(--glow-accent);
  transform: translateZ(40px);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: spin-slow 14s linear infinite;
}
.sim-core::after {
  content: '</>';
  font-family: var(--font-mono);
  color: #fff;
  font-size: var(--step-1);
  animation: spin-slow 14s linear infinite reverse;
}
.sim-node {
  position: absolute;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--primary-2);
  box-shadow: 0 0 12px var(--primary-2);
  transform: translateZ(60px);
}
.sim-node.n1 { top: 6%; left: 48%; }
.sim-node.n2 { top: 46%; left: 4%; }
.sim-node.n3 { top: 46%; left: 92%; }
.sim-node.n4 { top: 86%; left: 48%; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-8);
  align-items: start;
}
.domain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

/* ---------- Skills strip ---------- */
.marquee {
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: var(--space-5) 0;
}
.marquee-track {
  display: flex;
  gap: var(--space-8);
  width: max-content;
  animation: ticker 28s linear infinite;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  color: var(--text-muted);
}
.marquee-track span { white-space: nowrap; }
.marquee:hover .marquee-track { animation-play-state: paused; }

/* movimiento reducido: sin ticker; la franja se puede desplazar a mano en lugar de quedar congelada a medias */
@media (prefers-reduced-motion: reduce) {
  .marquee { overflow-x: auto; }
  .marquee-track { animation: none; }
}

/* ---------- Contact / footer ---------- */
.contact-section { text-align: center; }
.contact-section .section-head { margin-inline: auto; text-align: center; }
.contact-section h2 { max-width: 16ch; margin-inline: auto; }

.site-footer {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--text-muted);
}

/* Nota de privacidad del contador de visitas: plegada en el pie, en una fila propia */
.privacy-note { flex-basis: 100%; }
.privacy-note summary { width: fit-content; cursor: pointer; }
.privacy-note summary:hover { color: var(--text-primary); }
.privacy-note p {
  max-width: 72ch;
  margin-top: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--step--1);
  line-height: var(--leading-normal);
}
.privacy-note a { color: var(--primary-2); }

/* =========================================================
   RESPONSIVE
   Mobile-first breakpoints layered as max-width overrides.
   ========================================================= */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-3d { order: -1; width: min(60%, 42vh); margin-inline: auto; }
  .about-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; --section-pad: var(--space-8); }
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .domain-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .contact-card { flex-direction: column; text-align: center; }

  /* header compacto para que logo + acciones quepan dentro del gutter */
  .nav-actions { gap: var(--space-2); }
  .logo { gap: var(--space-2); font-size: var(--step-0); }
  .lang-toggle button { padding: 0.5rem 0.6rem; }
}

@media (max-width: 380px) {
  .logo-text { display: none; }
}

/* mobile nav drawer */
.mobile-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 90;
  background: var(--bg);
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--dur-slow) var(--ease-in-out), visibility 0s linear var(--dur-slow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
}
.mobile-nav.is-open {
  transform: translateX(0);
  visibility: visible;
  transition-delay: 0s;
}
.mobile-nav a { font-family: var(--font-display); font-size: var(--step-3); }

/* el drawer solo existe en móvil */
@media (min-width: 769px) {
  .mobile-nav { display: none; }
}

/* bloquea el scroll de la página mientras el menú está abierto (solo en móvil,
   para que nunca pueda quedar bloqueado en escritorio) */
@media (max-width: 768px) {
  html.menu-open,
  html.menu-open body { overflow: hidden; }
}