/* ==========================================================================
   IBC — Reset, base tipográfica y utilidades compartidas
   ========================================================================== */

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

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

body {
  margin: 0;
  background-color: var(--surface-page);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.is-locked { overflow: hidden; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

p { margin: 0; }

/* El atributo `hidden` debe ganar a cualquier `display` de componente:
   las reglas de autor superan la hoja del navegador y lo dejarían visible. */
[hidden] { display: none !important; }
ul, ol { margin: 0; padding: 0; list-style: none; }

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

button { font: inherit; color: inherit; }

/* --- Foco visible, consistente en claro y oscuro ---------------------- */
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--color-brass-400);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* --- Salto al contenido ------------------------------------------------ */
.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: var(--z-skip);
  padding: var(--space-xs) var(--space-md);
  background-color: var(--color-brass-500);
  color: var(--color-navy-950);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  transform: translate(-50%, -140%);
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

.skip-link:focus-visible { transform: translate(-50%, 0); }

/* --- Layout ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-gutter);
}

.section { padding-block: var(--space-section); }
.section--alt { background-color: var(--surface-alt); }
.section--dark { background-color: var(--surface-dark); color: var(--color-on-dark); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* --- Encabezados de sección ------------------------------------------- */
.section-head { text-align: center; }
.section-head--start { text-align: left; }

.section-title {
  font-size: var(--text-h2);
  letter-spacing: var(--tracking-title);
}

.section-kicker {
  margin-top: var(--space-sm);
  color: var(--color-ink-muted);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
}

.section--dark .section-kicker,
.panel-dark .section-kicker { color: var(--color-on-dark-muted); }

/* --- Botones ----------------------------------------------------------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--color-ink);
  --btn-border: currentColor;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 48px;
  padding: 0.9rem 1.65rem;
  border: 1px solid var(--btn-border);
  background-color: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  cursor: pointer;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  transition: color var(--duration-normal) var(--ease-out-expo),
              border-color var(--duration-normal) var(--ease-out-expo),
              transform var(--duration-fast) var(--ease-out-expo);
}

/* Barrido de relleno desde la izquierda: sólo transform, sin reflow */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: var(--btn-fill, var(--color-navy-900));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.btn:hover::before,
.btn:focus-visible::before { transform: scaleX(1); }
.btn:hover { color: var(--btn-fill-fg, var(--color-bone-50)); }
.btn:active { transform: translateY(1px); }

.btn .btn-arrow {
  font-size: 0.72em;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.btn:hover .btn-arrow { transform: translateX(5px); }

.btn--light {
  --btn-bg: var(--color-bone-50);
  --btn-fg: var(--color-navy-900);
  --btn-border: var(--color-bone-50);
  --btn-fill: var(--color-navy-900);
  --btn-fill-fg: var(--color-bone-50);
}
.btn--light:hover, .btn--light:focus-visible { border-color: var(--color-navy-900); }

.btn--dark {
  --btn-bg: var(--color-navy-900);
  --btn-fg: var(--color-bone-50);
  --btn-border: var(--color-navy-900);
  --btn-fill: var(--color-bone-50);
  --btn-fill-fg: var(--color-navy-900);
}
.btn--dark:hover, .btn--dark:focus-visible { border-color: var(--color-bone-50); }

.btn--brass {
  --btn-bg: var(--color-brass-500);
  --btn-fg: var(--color-navy-950);
  --btn-border: var(--color-brass-500);
  --btn-fill: var(--color-brass-300);
  --btn-fill-fg: var(--color-navy-950);
}
.btn--brass:hover, .btn--brass:focus-visible { border-color: var(--color-brass-300); }

.btn--ghost {
  --btn-fg: var(--color-on-dark);
  --btn-border: rgba(244, 242, 237, 0.5);
  --btn-fill: var(--color-bone-50);
  --btn-fill-fg: var(--color-navy-900);
}
.btn--ghost:hover, .btn--ghost:focus-visible { border-color: var(--color-bone-50); }

.btn--sm { min-height: 40px; padding: 0.6rem 1.15rem; }
.btn--block { width: 100%; }

/* --- Revelado al hacer scroll ------------------------------------------
   Mejora progresiva: el estado oculto sólo existe cuando `js-reveal` confirma
   que el script corre. Si el JS falla o está bloqueado, el contenido se ve. */
.js-reveal .reveal {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.js-reveal .reveal.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* --- Preferencia de movimiento reducido -------------------------------- */
@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;
    scroll-behavior: auto !important;
  }
  .js-reveal .reveal { opacity: 1; transform: none; }
}