/* ============================================================
   02-base.css — Reset moderno, tipografía y utilidades base
   Estrategia: mobile first. Todo escala hacia arriba.
   ============================================================ */

/* ---------- 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);
}

body {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
  overflow-x: hidden;
}

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

input, button, textarea, select { font: inherit; color: inherit; }

button { background: none; border: 0; cursor: pointer; }

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

a { color: var(--color-primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }

:target { scroll-margin-top: calc(var(--header-h) + 1rem); }

/* ---------- Foco visible y accesible ---------- */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}
:focus:not(:focus-visible) { outline: none; }

::selection { background: var(--brand-200); color: var(--brand-900); }

/* ---------- Tipografía ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-heading);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  font-weight: var(--weight-extra);
  text-wrap: balance;
}

h1 { font-size: var(--step-5); }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-2); font-weight: var(--weight-bold); }
h4 { font-size: var(--step-1); font-weight: var(--weight-bold); line-height: var(--leading-snug); }

p { text-wrap: pretty; max-width: 68ch; }

strong { font-weight: var(--weight-semibold); color: var(--color-heading); }

small { font-size: var(--step--1); }

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

.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); }
.section--soft { background: var(--color-bg-soft); }
.section--alt { background: var(--color-bg-alt); }
.section--invert {
  background: var(--grad-deep);
  color: var(--color-text-invert);
}
.section--invert h1,
.section--invert h2,
.section--invert h3,
.section--invert h4 { color: var(--white); }
.section--invert p { color: var(--brand-100); }

/* Grid auto-responsivo sin media queries */
.grid { display: grid; gap: var(--space-lg); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); }

.stack > * + * { margin-top: var(--space-md); }
.stack-lg > * + * { margin-top: var(--space-lg); }

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
}

/* ---------- Utilidades ---------- */
.text-center { text-align: center; }
.text-center p { margin-inline: auto; }
.mx-auto { margin-inline: auto; }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.lead { font-size: var(--step-1); color: var(--color-text-soft); line-height: 1.55; }
.muted { color: var(--color-text-soft); }
.measure { max-width: 60ch; }

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

.skip-link {
  position: absolute;
  left: 50%;
  translate: -50% -150%;
  z-index: var(--z-float);
  background: var(--brand-900);
  color: var(--white);
  padding: var(--space-sm) var(--space-lg);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  transition: translate var(--dur-base) var(--ease-out);
}
.skip-link:focus-visible { translate: -50% 0; }

/* ---------- Animación de entrada (progressive enhancement) ---------- */
[data-reveal] {
  opacity: 1;
  transform: none;
}
.js [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

@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;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .site-header, .site-footer, .floating-actions, .hero__media { display: none !important; }
  body { color: #000; background: #fff; }
}