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

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-text);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

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

h1, h2, h3, h4 { font-family: var(--f-display); line-height: var(--lh-tight); font-weight: var(--fw-bold); letter-spacing: -0.02em; }
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }

p { max-width: var(--w-text); }

a { color: inherit; }
a:not([class]) { text-decoration-thickness: 1px; text-underline-offset: 3px; }

ul, ol { padding-left: 1.25em; }
ul[class], ol[class] { list-style: none; padding: 0; }

/* ---------- Foco visible: nunca se elimina sin sustituto ---------- */
:focus-visible {
  outline: var(--focus-width) solid var(--focus-color);
  outline-offset: var(--focus-offset);
  border-radius: var(--r-sm);
}
/* Los navegadores modernos no muestran foco al hacer clic con ratón */
:focus:not(:focus-visible) { outline: none; }

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

.skip-link {
  position: absolute; top: 0; left: var(--s-4);
  transform: translateY(-150%);
  z-index: 200;
  background: var(--c-accent); color: var(--c-accent-ink);
  padding: var(--s-3) var(--s-5);
  border-radius: 0 0 var(--r-md) var(--r-md);
  font-weight: var(--fw-semi); text-decoration: none;
  transition: transform var(--dur-fast) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.page { width: min(100% - var(--gutter) * 2, var(--w-page)); margin-inline: auto; }
.stack > * + * { margin-top: var(--s-4); }
.section { padding-block: clamp(var(--s-7), 9vw, var(--s-9)); }
.section--tight { padding-block: var(--s-7); }

.eyebrow {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--s-3);
}
.lede { font-size: var(--fs-md); color: var(--c-text-muted); }
.muted { color: var(--c-text-muted); }
.mono { font-family: var(--f-mono); }
.center { text-align: center; margin-inline: auto; }

.grid { display: grid; gap: var(--s-5); }
@media (min-width: 640px)  { .g-2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px)  { .g-3 { grid-template-columns: repeat(3, 1fr); }
                             .g-4 { grid-template-columns: repeat(4, 1fr); }
                             .g-sidebar { grid-template-columns: 1.1fr .9fr; gap: var(--s-7); } }

/* ---------- Aparición al hacer scroll (se anula sin movimiento) ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Aviso de prototipo (quitar al publicar) ---------- */
.proto-flag {
  background: var(--c-star); color: #241800;
  font-family: var(--f-mono); font-size: var(--fs-xs);
  text-align: center; padding: var(--s-2) var(--s-4);
  letter-spacing: .04em;
}
.proto-flag a { color: inherit; }