/* ==========================================================================
   BASE — reset, tipografía, elementos fundamentales
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@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; scroll-behavior: auto !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  letter-spacing: -0.006em;
  color: var(--text-on-light);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01" on, "cv01" on;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; display: block; height: auto; }
picture { display: block; }

a { color: inherit; text-decoration: none; }
ul, ol { padding: 0; margin: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; background: none; border: none; color: inherit; }
input, select, textarea { font-family: inherit; font-size: 1rem; color: inherit; }
table { border-collapse: collapse; width: 100%; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  color: inherit;
  margin: 0;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
}
h1 { font-size: var(--fs-h1); font-family: var(--font-display); font-weight: 600; letter-spacing: -0.03em; }
h2 { font-size: var(--fs-h2); font-family: var(--font-display); font-weight: 600; letter-spacing: -0.025em; }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }
p { margin: 0; }

::selection { background: var(--c-blue-500); color: #fff; }

/* Focus visible accesible */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--c-blue-400);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Skip link */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 9999;
  background: var(--c-blue-600); color: #fff; padding: 12px 20px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---- Layout utilities ---- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}
.container--narrow { max-width: 920px; }

section { position: relative; }

.section-pad { padding-block: var(--space-3xl); }
.section-pad--sm { padding-block: var(--space-2xl); }

@media (max-width: 720px) {
  .section-pad { padding-block: var(--space-2xl); }
  .section-pad--sm { padding-block: var(--space-xl); }
}

.grid { display: grid; gap: var(--space-md); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }

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

/* ---- Theming surfaces ---- */
.surface-dark { background: var(--bg-dark); color: var(--text-on-dark); }
.surface-dark-alt { background: var(--bg-dark-alt); color: var(--text-on-dark); }
.surface-light-alt { background: var(--bg-light-alt); color: var(--text-on-light); }
.surface-white { background: var(--bg-white); color: var(--text-on-light); }

/* ---- Continuidad visual entre secciones oscuras: línea técnica sutil ---- */
.surface-dark, .surface-dark-alt { position: relative; }
.surface-dark::before, .surface-dark-alt::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(63,155,255,.4), transparent);
  pointer-events: none; z-index: 1;
}

/* ---- Kicker / eyebrow tag ---- */
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-blue-500);
}
.kicker::before {
  content: "";
  width: 22px; height: 2px;
  background: var(--c-blue-500);
  display: inline-block;
}
.surface-dark .kicker, .surface-dark-alt .kicker { color: var(--c-blue-300); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 16px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; transition: transform var(--dur-fast) var(--ease-out); flex-shrink: 0; }
.btn:hover svg { transform: translate(3px, -3px); }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--c-blue-500);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn--primary:hover { background: var(--c-blue-600); box-shadow: 0 0 0 1px rgba(63,155,255,.4), 0 16px 36px rgba(20,101,196,.32); }

.btn--outline {
  background: transparent;
  border-color: var(--border-light-strong);
  color: var(--text-on-light);
}
.btn--outline:hover { border-color: var(--c-blue-500); color: var(--c-blue-600); }

.surface-dark .btn--outline, .surface-dark-alt .btn--outline, .hero .btn--outline {
  border-color: var(--border-dark-strong);
  color: var(--text-on-dark);
}
.surface-dark .btn--outline:hover, .surface-dark-alt .btn--outline:hover, .hero .btn--outline:hover {
  border-color: var(--c-blue-400); color: var(--c-blue-300);
}

.btn--ghost {
  background: rgba(255,255,255,0.06);
  color: var(--text-on-dark);
  border-color: var(--border-dark);
}
.btn--ghost:hover { background: rgba(255,255,255,0.1); }

.btn--whatsapp { background: var(--c-whatsapp); color: #fff; }
.btn--whatsapp:hover { background: #189063; }

.btn--sm { padding: 11px 18px; font-size: 0.78rem; }
.btn--block { width: 100%; }

/* ---- Text link with progressive underline ---- */
.link-arrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700; font-size: 0.875rem; letter-spacing: 0.02em;
  color: var(--c-blue-600);
  position: relative;
}
.surface-dark .link-arrow, .surface-dark-alt .link-arrow { color: var(--c-blue-300); }
.link-arrow::after {
  content: ""; position: absolute; left: 0; bottom: -3px; height: 1px; width: 100%;
  background: currentColor; transform: scaleX(0.3); transform-origin: left; opacity: .4;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.link-arrow:hover::after { transform: scaleX(1); opacity: 1; }
.link-arrow svg { width: 15px; height: 15px; transition: transform var(--dur-fast) var(--ease-out); }
.link-arrow:hover svg { transform: translateX(4px); }

/* ---- Badge ---- */
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: var(--fs-micro); font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  padding: 8px 14px; border-radius: 100px;
  background: rgba(63, 155, 255, 0.12); color: var(--c-blue-300);
  border: 1px solid rgba(63, 155, 255, 0.28);
}
.badge--dot::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge--light { background: var(--accent-soft); color: var(--c-blue-700); border-color: rgba(20,101,196,.16); }

/* ---- Divider ---- */
.hr { height: 1px; background: var(--border-light); border: 0; }
.surface-dark .hr, .surface-dark-alt .hr { background: var(--border-dark); }

/* ---- Reveal animations ---- */
[data-reveal] { opacity: 0; will-change: transform, opacity; transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
[data-reveal="up"] { transform: translateY(28px); }
[data-reveal="left"] { transform: translateX(-28px); }
[data-reveal="right"] { transform: translateX(28px); }
[data-reveal="scale"] { transform: scale(0.94); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* Scrollbar (webkit) subtle */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-light-alt); }
::-webkit-scrollbar-thumb { background: var(--c-steel-400); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-steel-500); }

/* ---------------------------------------------------------------
 * Animación de entrada de página + transición entre páginas
 * ------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  /* El header (sticky + backdrop-filter + mega-menú) queda fuera de esta
     animación a propósito: animarlo generaba un containing block nuevo
     que rompía el mega-menú y forzaba recalcular el blur en cada frame.
     Solo se anima #main, con opacity+transform (propiedades de compositor,
     sin repintado), y termina en <350ms para que se sienta instantáneo. */
  #main { animation: hdpe-main-in 0.35s var(--ease-out) both; }

  @keyframes hdpe-main-in {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: none; }
  }
}

.page-transition {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 50%, rgba(63, 155, 255, 0.16), transparent 60%),
    linear-gradient(135deg, var(--c-graphite-950), var(--c-graphite-900) 55%, var(--c-blue-900));
  transition: opacity 0.38s var(--ease-in-out);
}
.page-transition::before {
  content: "";
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-top-color: var(--c-blue-400);
  opacity: 0;
  transform: scale(0.85);
  transition: opacity 0.25s ease 0.1s, transform 0.25s ease 0.1s;
}
.page-transition.is-active {
  opacity: 1;
  pointer-events: all;
}
.page-transition.is-active::before {
  opacity: 1;
  transform: scale(1);
  animation: hdpe-spin 0.8s linear infinite;
}
@keyframes hdpe-spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .page-transition { display: none; }
}