/* ==========================================================================
   Vectra IA Lab — Base / Reset
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  font-family: var(--font-cuerpo);
  font-size: var(--fs-body);
  line-height: var(--lh-cuerpo);
  color: var(--color-texto);
  background-color: var(--color-blanco);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

/* ---- Tipografía ---- */
h1, h2, h3, h4 {
  font-family: var(--font-titulo);
  color: var(--color-azul-oscuro);
  line-height: var(--lh-titulo);
  font-weight: 700;
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 600; }

p { max-width: var(--contenedor-texto); }
p + p { margin-top: var(--sp-2); }

a {
  color: var(--color-azul-oscuro);
  text-decoration-color: var(--color-azul);
  text-underline-offset: 3px;
  transition: color var(--t-rapida);
}
a:hover { color: var(--color-azul); }

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

ul, ol { padding-left: 1.25rem; }
li + li { margin-top: 0.35rem; }

strong { color: var(--color-azul-oscuro); font-weight: 700; }

/* ---- Foco visible accesible (WCAG 2.1 AA) ---- */
:focus-visible {
  outline: 3px solid var(--color-azul);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---- Skip link ---- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--color-azul-oscuro);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radio) 0;
  font-weight: 600;
}
.skip-link:focus {
  left: 0;
  color: #fff;
}

/* ---- Utilidades de accesibilidad ---- */
.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;
}

/* ---- Contenedores / layout ---- */
.contenedor {
  width: 100%;
  max-width: var(--contenedor-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.seccion {
  padding-block: clamp(var(--sp-8), 8vw, var(--sp-10));
}
.seccion--compacta {
  padding-block: clamp(var(--sp-6), 6vw, var(--sp-8));
}

.fondo-palido { background-color: var(--color-azul-palido); }
.fondo-gris { background-color: var(--color-gris-claro); }
.fondo-oscuro {
  background-color: var(--color-azul-oscuro);
  color: var(--color-gris-claro);
}
.fondo-oscuro h1, .fondo-oscuro h2, .fondo-oscuro h3 { color: #fff; }

/* Encabezado de sección centrado */
.seccion-cabecera {
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: var(--sp-6);
  text-align: center;
}
.seccion-cabecera p { margin-inline: auto; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-cuerpo);
  font-weight: 700;
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-azul);
  margin-bottom: var(--sp-1);
}