/* ============================================================
   BASE — reset, tipografía, utilidades y accesibilidad
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; 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;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
ul, ol { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4, p, figure { margin: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--lh-tight);
  color: var(--color-ink);
  text-wrap: balance;
}

::selection { background: var(--color-accent-soft); color: var(--color-accent-ink); }

/* --- Foco visible y coherente en toda la página --- */
:focus-visible {
  outline: 2.5px solid var(--color-accent-dark);
  outline-offset: 3px;
  border-radius: 2px;
}
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) { outline: none; }

/* --- Utilidades de layout --- */
.u-container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.u-section {
  padding-block: var(--space-3xl);
  position: relative;
}
.u-section--tight { padding-block: var(--space-2xl); }
.u-section--alt { background: var(--color-bg-alt); }
.u-section--dark {
  background: var(--color-bg-dark);
  color: var(--color-ink-on-dark);
}
.u-section--dark h2, .u-section--dark h3 { color: var(--color-ink-on-dark); }

.u-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-block-end: var(--space-sm);
}
.u-section--dark .u-eyebrow { color: var(--color-accent-light); }
.u-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  display: inline-block;
}

.u-lede {
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
  color: var(--color-ink-soft);
  max-width: 54ch;
}
.u-section--dark .u-lede { color: var(--color-ink-on-dark-soft); }

.u-section-head {
  max-width: 46rem;
  margin-block-end: var(--space-xl);
}
.u-section-head--center { margin-inline: auto; text-align: center; }

.u-italic { font-style: italic; color: var(--color-accent); }
.u-section--dark .u-italic { color: var(--color-accent-light); }

.u-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;
}

.u-skip-link {
  position: absolute;
  left: var(--space-sm);
  top: -60px;
  background: var(--color-ink);
  color: var(--color-ink-on-dark);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease-editorial);
  font-weight: 600;
  font-size: var(--fs-sm);
}
.u-skip-link:focus {
  top: var(--space-sm);
}

/* --- Reveal on scroll (progresivo, respeta reduced-motion) --- */
.js-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-editorial),
              transform var(--dur-slow) var(--ease-editorial);
}
.js-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .js-reveal { opacity: 1; transform: none; }
}
.no-js .js-reveal { opacity: 1; transform: none; }

/* stagger helper para grupos de tarjetas */
.js-reveal[data-delay="1"] { transition-delay: 60ms; }
.js-reveal[data-delay="2"] { transition-delay: 120ms; }
.js-reveal[data-delay="3"] { transition-delay: 180ms; }
.js-reveal[data-delay="4"] { transition-delay: 240ms; }
.js-reveal[data-delay="5"] { transition-delay: 300ms; }